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* 1.7.5-1: fork throw segfault with g++ 4.3.4
@ 2010-04-27  7:02 Tim Wilson-Brown
  2010-05-04 18:31 ` Dave Korn
  2010-05-07 21:38 ` Christopher Faylor
  0 siblings, 2 replies; 3+ messages in thread
From: Tim Wilson-Brown @ 2010-04-27  7:02 UTC (permalink / raw)
  To: cygwin

[-- Attachment #1: Type: text/plain, Size: 1696 bytes --]

Hi,

I have identified a reproducible segfault when throwing exceptions in the thrift IPC library under cygwin 1.7.5-1.

An example c++ program is attached which always segfaults on my machine when compiled with g++-4 (4.3.4 20090804) under 1.7.5-1.
I have also attached the stackdump, a standard cygcheck.out, and another more verbose set of testcases.


The issue is similar to the issue described in http://cygwin.com/ml/cygwin/2009-07/msg00150.html but in much more specific circumstances.

The segfault happens under the following circumstances:

1. compiled with g++-4 (4.3.4 20090804)
2. compiled/run on cygwin 1.7.5-1
3. fork at least once
4. throw a derived exception class in the child
5. where the derived class contains a std::string member
6. catch std::exception or std::exception&

It can also occur in similar circumstances when catching the derived class, but I have been unable to reproduce this segfault in a simple test program.


The segfault does not occur reproducibly under the following circumstances:

1. compiled with g++-3 (3.4.4)
2. compiled/run on cygwin versions 1.7.1-1 to 1.7.4-1
3. no fork
4. throw in the parent, or throw std::exception, std::string, or const char *
5. where the derived class does not contain a std::string member
6. catch the derived class (can't reproduce in simple test program), or catch(...)

Compiling with g++-3 is the simplest workaround I have found.


I didn't know whether to send this bug report to the cygwin mailing list or the g++ mailing list.

I chose the cygwin mailing list because the segfault started to happen reliably after I installed cygwin 1.7.5-1 on April 12 2010.

Tim


Tim Wilson-Brown
E: twilsonb at mac dot com

[-- Attachment #2: fork_throw_example.cpp --]
[-- Type: application/octet-stream, Size: 1205 bytes --]

//fork/throw SEGFAULT issue

//a SEGFAULT occurs under these circumstances:
// 1. compile with g++-4 (4.3.4 20090804) on cygwin 1.7.5-1
//      - g++-3 does not have this issue
//      - occurrences in cyg 1.7.4-1 were not reproducible (other causes?)
// 2. fork at least once
// 3. throw a derived exception class in the child
// 4. where the derived class contains a std::string member
// 5. catch std::exception
//To see the SEGFAULT, you will need error_start=dumper.exe 
//or something similar in the CYGWIN environmental variable



#include <string>
#include <exception>

#include <cstdlib>

#include <sys/types.h>
#include <unistd.h>

using namespace std;



class stringexcept : public exception {

public:

  stringexcept() : exception(), _what() {}

  virtual ~stringexcept() throw() {}

  string _what;

};



int main(int, char**) {

  try {

    pid_t pid = fork();
      
    if (pid == 0) {

      //child - throw and SEGFAULT
      throw stringexcept();
        
    } else if (pid > 0) {

      //parent
      exit(0);
        
    } else {
        
      //fork() failed
      exit(1);
        
    } //if parent/child
  } catch(exception e) {

    //do nothing

  }
    
  return 0;
}

[-- Attachment #3: fork_throw_example.exe.stackdump --]
[-- Type: application/octet-stream, Size: 846 bytes --]

Exception: STATUS_ACCESS_VIOLATION at eip=00402361
eax=D85EF560 ebx=0022CA34 ecx=6C4FB37C edx=00000000 esi=6C4FB37C edi=00680318
ebp=0022CA18 esp=0022C9F0 program=C:\cygwin\home\Administrator\bug_fork_throw\fork_throw_example.exe, pid 3908, thread main
cs=001B ds=0023 es=0023 fs=003B gs=0000 ss=0023
Stack trace:
Frame     Function  Args
0022CA18  00402361  (0040316C, 6C4FB37C, 00680318, 0022CA34)
0022CA48  00402255  (0040316C, 6C4FB37C, 0022CA78, 00000001)
0022CA88  6C486609  (0022CAF8, 0022CB04, 0022CB08, 00000004)
0022CB18  6C4E9994  (00000001, 00000001, 432B2B00, 474E5543)
0022CD18  67F07CEA  (006802F8, 61228BC6, 0022CD68, 0040118B)
0022CD28  6C4E8EF9  (00680318, 0040316C, 004020B8, 610F0038)
0022CD68  0040118B  (0022D008, 00000002, 611A0CCE, 61006DDA)
0022CDA8  61006DDA  (00000000, 0022CDE0, 610066E0, 7FFD6000)
End of stack trace

[-- Attachment #4: cygcheck.out --]
[-- Type: application/octet-stream, Size: 82214 bytes --]


Cygwin Configuration Diagnostics
Current System Time: Mon Apr 26 13:36:18 2010

Windows XP Professional Ver 5.1 Build 2600 Service Pack 3

Path:	C:\cygwin\usr\local\bin
	C:\cygwin\bin
	C:\cygwin\bin
	%CommonProgramFiles%\Microsoft Shared\Windows Live
	C:\WINDOWS\system32
	C:\WINDOWS
	C:\WINDOWS\System32\Wbem
	C:\WINDOWS\system32\WindowsPowerShell\v1.0
	C:\Program Files\Common-Use Signing Interface\JRE\bin
	C:\Program Files\GtkSharp\2.12\bin
	C:\Program Files\QuickTime\QTSystem\
	C:\Program Files\Common Files\Microsoft Shared\Windows Live

Output from C:\cygwin\bin\id.exe
UID: 500(Administrator) GID: 513(None)
513(None)               0(root)                 544(Administrators)
545(Users)

SysDir: C:\WINDOWS\system32
WinDir: C:\WINDOWS

USER = 'Administrator'
PWD = '/home/Administrator/bug_fork_throw'
CYGWIN = 'error_start=C:\cygwin\bin\dumper.exe'
HOME = '/home/Administrator'

HOMEPATH = '\Documents and Settings\Administrator'
MANPATH = '/usr/local/man:/usr/share/man:/usr/man::/usr/ssl/man'
APPDATA = 'C:\Documents and Settings\Administrator\Application Data'
HOSTNAME = 'basement'
TERM = 'xterm'
PROCESSOR_IDENTIFIER = 'x86 Family 15 Model 3 Stepping 3, GenuineIntel'
WINDIR = 'C:\WINDOWS'
TMPDIR = '/tmp'
OLDPWD = '/home/Administrator'
USERDOMAIN = 'BASEMENT'
OS = 'Windows_NT'
ALLUSERSPROFILE = 'C:\Documents and Settings\All Users'
TEMP = '/tmp'
COMMONPROGRAMFILES = 'C:\Program Files\Common Files'
GTK_BASEPATH = 'C:\Program Files\GtkSharp\2.12\'
QTJAVA = 'C:\Program Files\Java\jre6\lib\ext\QTJava.zip'
USERNAME = 'Administrator'
PROCESSOR_LEVEL = '15'
FP_NO_HOST_CHECK = 'NO'
SYSTEMDRIVE = 'C:'
LANG = 'C.UTF-8'
USERPROFILE = 'C:\Documents and Settings\Administrator'
CLIENTNAME = 'Console'
QMAKESPEC = 'cygwin-g++'
PS1 = '\[\e]0;\w\a\]\n\[\e[32m\]\u@\h \[\e[33m\]\w\[\e[0m\]\n\$ '
LOGONSERVER = '\\BASEMENT'
HISTIGNORE = '[ 	]*:&:[fb]g:exit'
PROCESSOR_ARCHITECTURE = 'x86'
HISTCONTROL = 'ignoredups'
SHLVL = '1'
PATHEXT = '.COM;.EXE;.BAT;.CMD;.VBS;.VBE;.JS;.JSE;.WSF;.WSH;.PSC1'
HOMEDRIVE = 'C:'
COMSPEC = 'C:\WINDOWS\system32\cmd.exe'
TMP = '/tmp'
SYSTEMROOT = 'C:\WINDOWS'
CSILOGLEVEL = 'NORMAL'
PRINTER = '\\WH_PRINTER\BINARY_P1'
CVS_RSH = '/bin/ssh'
PROCESSOR_REVISION = '0303'
CLASSPATH = '.;C:\Program Files\Java\jre6\lib\ext\QTJava.zip'
INFOPATH = '/usr/local/info:/usr/share/info:/usr/info:'
PROGRAMFILES = 'C:\Program Files'
NUMBER_OF_PROCESSORS = '2'
asl.log = 'Destination=file;OnFirstLog=command,environment'
SESSIONNAME = 'Console'
COMPUTERNAME = 'BASEMENT'
_ = '/usr/bin/cygcheck'

HKEY_CURRENT_USER\Software\Cygwin
HKEY_CURRENT_USER\Software\Cygwin\Program Options
HKEY_CURRENT_USER\Software\Cygwin\setup
HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\MenuOrder\Start Menu2\Programs\Cygwin
  (default) = (unsupported type)
HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\MenuOrder\Start Menu2\Programs\Cygwin-X
  (default) = (unsupported type)
HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\MenuOrder\Start Menu2\Programs\Developer\Cygwin
  (default) = (unsupported type)
HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\MenuOrder\Start Menu2\Programs\Developer\Cygwin-X
  (default) = (unsupported type)
HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\MenuOrder\Start Menu2\Programs\Developer\Cygwin-X\Editors
  (default) = (unsupported type)
HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\MenuOrder\Start Menu2\Programs\Developer\Cygwin-X\Information
  (default) = (unsupported type)
HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\MenuOrder\Start Menu2\Programs\Developer\Cygwin-X\Tools
  (default) = (unsupported type)
HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\MenuOrder\Start Menu2\Programs\Developer\Cygwin-X\Toys
  (default) = (unsupported type)
HKEY_LOCAL_MACHINE\SOFTWARE\Cygwin
HKEY_LOCAL_MACHINE\SOFTWARE\Cygwin\Installations
  (default) = '\??\C:\cygwin'
HKEY_LOCAL_MACHINE\SOFTWARE\Cygwin\Program Options
HKEY_LOCAL_MACHINE\SOFTWARE\Cygwin\setup
  (default) = 'C:\cygwin'

obcaseinsensitive set to 1

Cygwin installations found in the registry:
  System: Key: c5e39b7a9d22bafb Path: C:\cygwin

c:  hd  NTFS     76253Mb  27% CP CS UN PA FC     
d:  cd             N/A    N/A                    

C:\cygwin        /          system  binary,auto
C:\cygwin\bin    /usr/bin   system  binary,auto
C:\cygwin\lib    /usr/lib   system  binary,auto
cygdrive prefix  /cygdrive  user    binary,auto

Found: C:\cygwin\bin\awk.exe
Found: C:\cygwin\bin\awk.exe
 -> C:\cygwin\bin\gawk.exe
Found: C:\cygwin\bin\bash.exe
Found: C:\cygwin\bin\bash.exe
Found: C:\cygwin\bin\cat.exe
Found: C:\cygwin\bin\cat.exe
Found: C:\cygwin\bin\cp.exe
Found: C:\cygwin\bin\cp.exe
Found: C:\cygwin\bin\cpp.exe
Found: C:\cygwin\bin\cpp.exe
 -> C:\cygwin\etc\alternatives\cpp
 -> C:\cygwin\bin\cpp-4.exe
Found: C:\cygwin\bin\crontab.exe
Found: C:\cygwin\bin\crontab.exe
Found: C:\cygwin\bin\find.exe
Found: C:\cygwin\bin\find.exe
Found: C:\WINDOWS\system32\find.exe
Warning: C:\cygwin\bin\find.exe hides C:\WINDOWS\system32\find.exe
Found: C:\cygwin\bin\gcc.exe
Found: C:\cygwin\bin\gcc.exe
 -> C:\cygwin\etc\alternatives\gcc
 -> C:\cygwin\bin\gcc-4.exe
Found: C:\cygwin\bin\gdb.exe
Found: C:\cygwin\bin\gdb.exe
Found: C:\cygwin\bin\grep.exe
Found: C:\cygwin\bin\grep.exe
Found: C:\cygwin\bin\kill.exe
Found: C:\cygwin\bin\kill.exe
Found: C:\cygwin\bin\ld.exe
Found: C:\cygwin\bin\ld.exe
Found: C:\cygwin\bin\ls.exe
Found: C:\cygwin\bin\ls.exe
Found: C:\cygwin\bin\make.exe
Found: C:\cygwin\bin\make.exe
Found: C:\cygwin\bin\mv.exe
Found: C:\cygwin\bin\mv.exe
Found: C:\cygwin\bin\patch.exe
Found: C:\cygwin\bin\patch.exe
Found: C:\cygwin\bin\perl.exe
Found: C:\cygwin\bin\perl.exe
Found: C:\cygwin\bin\rm.exe
Found: C:\cygwin\bin\rm.exe
Found: C:\cygwin\bin\sed.exe
Found: C:\cygwin\bin\sed.exe
Found: C:\cygwin\bin\ssh.exe
Found: C:\cygwin\bin\ssh.exe
Found: C:\cygwin\bin\sh.exe
Found: C:\cygwin\bin\sh.exe
Found: C:\cygwin\bin\tar.exe
Found: C:\cygwin\bin\tar.exe
Found: C:\cygwin\bin\test.exe
Found: C:\cygwin\bin\test.exe
Not Found: vi
Not Found: vim

  111k 2009/08/07 C:\cygwin\bin\cygapr-1-0.dll - os=4.0 img=1.0 sys=4.0
                  "cygapr-1-0.dll" v0.0 ts=2009/8/8 5:58
   87k 2009/08/07 C:\cygwin\bin\cygaprutil-1-0.dll - os=4.0 img=1.0 sys=4.0
                  "cygaprutil-1-0.dll" v0.0 ts=2009/8/8 6:46
  704k 2007/12/18 C:\cygwin\bin\cygaspell-15.dll - os=4.0 img=1.0 sys=4.0
                  "cygaspell-15.dll" v0.0 ts=2007/12/18 22:39
   15k 2009/12/27 C:\cygwin\bin\cygattr-1.dll - os=4.0 img=1.0 sys=4.0
                  "cygattr-1.dll" v0.0 ts=2009/11/18 23:52
   72k 2009/03/18 C:\cygwin\bin\cygaudio-2.dll - os=4.0 img=1.0 sys=4.0
                  "cygaudio-2.dll" v0.0 ts=2009/3/18 15:40
  351k 2008/01/14 C:\cygwin\bin\cygboost_date_time-gcc-mt-1_33_1.dll - os=4.0 img=1.33 sys=4.0
                  "cygboost_date_time-gcc-mt-1_33_1.dll" v0.0 ts=2008/1/14 19:36
  120k 2008/01/14 C:\cygwin\bin\cygboost_filesystem-gcc-mt-1_33_1.dll - os=4.0 img=1.33 sys=4.0
                  "cygboost_filesystem-gcc-mt-1_33_1.dll" v0.0 ts=2008/1/14 19:36
   79k 2008/01/14 C:\cygwin\bin\cygboost_iostreams-gcc-mt-1_33_1.dll - os=4.0 img=1.33 sys=4.0
                  "cygboost_iostreams-gcc-mt-1_33_1.dll" v0.0 ts=2008/1/14 19:37
  526k 2008/01/14 C:\cygwin\bin\cygboost_program_options-gcc-mt-1_33_1.dll - os=4.0 img=1.33 sys=4.0
                  "cygboost_program_options-gcc-mt-1_33_1.dll" v0.0 ts=2008/1/14 19:38
  564k 2008/01/14 C:\cygwin\bin\cygboost_python-gcc-mt-1_33_1.dll - os=4.0 img=1.33 sys=4.0
                  "cygboost_python-gcc-mt-1_33_1.dll" v0.0 ts=2008/1/14 19:39
  678k 2008/01/14 C:\cygwin\bin\cygboost_regex-gcc-mt-1_33_1.dll - os=4.0 img=1.33 sys=4.0
                  "cygboost_regex-gcc-mt-1_33_1.dll" v0.0 ts=2008/1/14 19:41
  621k 2008/01/14 C:\cygwin\bin\cygboost_serialization-gcc-mt-1_33_1.dll - os=4.0 img=1.33 sys=4.0
                  "cygboost_serialization-gcc-mt-1_33_1.dll" v0.0 ts=2008/1/14 19:44
  118k 2008/01/14 C:\cygwin\bin\cygboost_signals-gcc-mt-1_33_1.dll - os=4.0 img=1.33 sys=4.0
                  "cygboost_signals-gcc-mt-1_33_1.dll" v0.0 ts=2008/1/14 19:44
   91k 2008/01/14 C:\cygwin\bin\cygboost_thread-gcc-mt-1_33_1.dll - os=4.0 img=1.33 sys=4.0
                  "cygboost_thread-gcc-mt-1_33_1.dll" v0.0 ts=2008/1/14 19:47
   29k 2009/10/11 C:\cygwin\bin\cygbrlapi-0.5.dll - os=4.0 img=1.0 sys=4.0
                  "cygbrlapi-0.5.dll" v0.0 ts=2009/10/11 14:17
   61k 2009/03/02 C:\cygwin\bin\cygbz2-1.dll - os=4.0 img=1.0 sys=4.0
                  "cygbz2-1.dll" v0.0 ts=2009/3/2 14:11
   11k 2009/12/23 C:\cygwin\bin\cygcharset-1.dll - os=4.0 img=1.0 sys=4.0
                  "cygcharset-1.dll" v0.0 ts=2009/12/24 0:25
   16k 2005/10/11 C:\cygwin\bin\cygcompface-0.dll - os=4.0 img=1.0 sys=4.0
                  "cygcompface-0.dll" v0.0 ts=2005/10/12 0:58
    7k 2003/10/19 C:\cygwin\bin\cygcrypt-0.dll - os=4.0 img=1.0 sys=4.0
                  "cygcrypt-0.dll" v0.0 ts=2003/10/19 18:57
 1144k 2010/03/24 C:\cygwin\bin\cygcrypto-0.9.8.dll - os=4.0 img=1.0 sys=4.0
                  "cygcrypto-0.9.8.dll" v0.0 ts=2010/3/25 2:16
  254k 2009/08/23 C:\cygwin\bin\cygcurl-4.dll - os=4.0 img=1.0 sys=4.0
                  "cygcurl-4.dll" v0.0 ts=2009/8/23 15:25
  424k 2007/12/16 C:\cygwin\bin\cygdb-3.1.dll - os=4.0 img=1.0 sys=4.0
                  "cygdb-3.1.dll" v0.0 ts=2007/12/17 1:09
  512k 2007/12/16 C:\cygwin\bin\cygdb-3.3.dll - os=4.0 img=1.0 sys=4.0
                  "cygdb-3.3.dll" v0.0 ts=2007/12/17 0:47
  547k 2007/12/18 C:\cygwin\bin\cygdb-4.0.dll - os=4.0 img=1.0 sys=4.0
                  "cygdb-4.0.dll" v0.0 ts=2007/12/19 0:35
  647k 2007/12/17 C:\cygwin\bin\cygdb-4.1.dll - os=4.0 img=1.0 sys=4.0
                  "cygdb-4.1.dll" v0.0 ts=2007/12/17 5:35
  703k 2007/12/17 C:\cygwin\bin\cygdb-4.2.dll - os=4.0 img=1.0 sys=4.0
                  "cygdb-4.2.dll" v0.0 ts=2007/12/17 22:58
  764k 2007/12/17 C:\cygwin\bin\cygdb-4.3.dll - os=4.0 img=1.0 sys=4.0
                  "cygdb-4.3.dll" v0.0 ts=2007/12/17 23:29
  866k 2007/12/17 C:\cygwin\bin\cygdb-4.4.dll - os=4.0 img=1.0 sys=4.0
                  "cygdb-4.4.dll" v0.0 ts=2007/12/17 23:55
  943k 2007/12/17 C:\cygwin\bin\cygdb-4.5.dll - os=4.0 img=1.0 sys=4.0
                  "cygdb-4.5.dll" v0.0 ts=2007/12/18 0:12
  329k 2007/12/16 C:\cygwin\bin\cygdb2.dll - os=4.0 img=1.0 sys=4.0
                  "cygdb2.dll" v0.0 ts=2007/12/17 0:19
  206k 2009/07/19 C:\cygwin\bin\cygdbus-1-3.dll - os=4.0 img=1.0 sys=4.0
                  "cygdbus-1-3.dll" v0.0 ts=2009/7/20 5:40
  725k 2007/12/16 C:\cygwin\bin\cygdb_cxx-3.1.dll - os=4.0 img=1.0 sys=4.0
                  "cygdb_cxx-3.1.dll" v0.0 ts=2007/12/17 1:09
  818k 2007/12/16 C:\cygwin\bin\cygdb_cxx-3.3.dll - os=4.0 img=1.0 sys=4.0
                  "cygdb_cxx-3.3.dll" v0.0 ts=2007/12/17 0:47
  857k 2007/12/18 C:\cygwin\bin\cygdb_cxx-4.0.dll - os=4.0 img=1.0 sys=4.0
                  "cygdb_cxx-4.0.dll" v0.0 ts=2007/12/19 0:35
  967k 2007/12/17 C:\cygwin\bin\cygdb_cxx-4.1.dll - os=4.0 img=1.0 sys=4.0
                  "cygdb_cxx-4.1.dll" v0.0 ts=2007/12/17 5:35
 1036k 2007/12/17 C:\cygwin\bin\cygdb_cxx-4.2.dll - os=4.0 img=1.0 sys=4.0
                  "cygdb_cxx-4.2.dll" v0.0 ts=2007/12/17 22:58
 1106k 2007/12/17 C:\cygwin\bin\cygdb_cxx-4.3.dll - os=4.0 img=1.0 sys=4.0
                  "cygdb_cxx-4.3.dll" v0.0 ts=2007/12/17 23:29
 1217k 2007/12/17 C:\cygwin\bin\cygdb_cxx-4.4.dll - os=4.0 img=1.0 sys=4.0
                  "cygdb_cxx-4.4.dll" v0.0 ts=2007/12/17 23:55
 1296k 2007/12/17 C:\cygwin\bin\cygdb_cxx-4.5.dll - os=4.0 img=1.0 sys=4.0
                  "cygdb_cxx-4.5.dll" v0.0 ts=2007/12/18 0:12
   14k 2009/10/15 C:\cygwin\bin\cygdmx-1.dll - os=4.0 img=1.0 sys=4.0
                  "cygdmx-1.dll" v0.0 ts=2009/10/14 11:32
   46k 2009/01/07 C:\cygwin\bin\cygecpg.dll - os=4.0 img=1.0 sys=4.0
                  "cygecpg.dll" v0.0 ts=2009/1/8 3:46
   12k 2009/01/07 C:\cygwin\bin\cygecpg_compat.dll - os=4.0 img=1.0 sys=4.0
                  "cygecpg_compat.dll" v0.0 ts=2009/1/8 3:46
  118k 2008/05/09 C:\cygwin\bin\cygexpat-1.dll - os=4.0 img=1.0 sys=4.0
                  "cygexpat-1.dll" v0.0 ts=2008/5/9 14:03
   28k 2009/03/22 C:\cygwin\bin\cygfam-0.dll - os=4.0 img=1.0 sys=4.0
                  "cygfam-0.dll" v0.0 ts=2009/3/23 5:56
  286k 2006/08/06 C:\cygwin\bin\cygfcgi++-0.dll - os=4.0 img=1.0 sys=4.0
                  "cygfcgi++-0.dll" v0.0 ts=2006/8/7 6:09
   30k 2006/08/06 C:\cygwin\bin\cygfcgi-0.dll - os=4.0 img=1.0 sys=4.0
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   24k 2009/12/11 C:\cygwin\bin\cygffi-4.dll - os=4.0 img=1.0 sys=4.0
                  "cygffi-4.dll" v0.0 ts=2009/12/8 11:39
  176k 2010/01/29 C:\cygwin\bin\cygfontconfig-1.dll - os=4.0 img=1.0 sys=4.0
                  "cygfontconfig-1.dll" v0.0 ts=2010/1/29 9:12
   21k 2009/10/14 C:\cygwin\bin\cygfontenc-1.dll - os=4.0 img=1.0 sys=4.0
                  "cygfontenc-1.dll" v0.0 ts=2009/10/14 12:04
   43k 2010/01/02 C:\cygwin\bin\cygform-10.dll - os=4.0 img=1.0 sys=4.0
                  "cygform-10.dll" v0.0 ts=2010/1/3 1:49
   40k 2009/03/01 C:\cygwin\bin\cygform-8.dll - os=4.0 img=1.0 sys=4.0
                  "cygform-8.dll" v0.0 ts=2009/3/1 17:32
   43k 2009/11/20 C:\cygwin\bin\cygform-9.dll - os=4.0 img=1.0 sys=4.0
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   48k 2003/08/09 C:\cygwin\bin\cygform7.dll - os=4.0 img=1.0 sys=4.0
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    Cygwin DLL version info:
        DLL version: 1.7.1
        DLL epoch: 19
        DLL old termios: 5
        DLL malloc env: 28
        Cygwin conv: 181
        API major: 0
        API minor: 218
        Shared data: 5
        DLL identifier: cygwin1
        Mount registry: 3
        Cygwin registry name: Cygwin
        Program options name: Program Options
        Installations name: Installations
        Cygdrive default prefix: 
        Build date: Mon Dec 7 11:48:55 CET 2009
        Shared id: cygwin1S5

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  351k 2008/01/14 C:\cygwin\bin\cygboost_date_time-gcc-mt-1_33_1.dll - os=4.0 img=1.33 sys=4.0
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  247k 2004/12/07 C:\cygwin\bin\cygtidy-0-99-0.dll - os=4.0 img=1.0 sys=4.0
                  "cygtidy-0-99-0.dll" v0.0 ts=2004/12/8 1:34
  347k 2009/12/23 C:\cygwin\bin\cygtiff-5.dll - os=4.0 img=1.0 sys=4.0
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   68k 2010/01/21 C:\cygwin\bin\cygUil-2.dll - os=4.0 img=1.0 sys=4.0
                  "cygUil-2.dll" v0.0 ts=2010/1/21 18:33
   40k 2009/07/08 C:\cygwin\bin\cygusb0.dll - os=4.0 img=1.0 sys=4.0
                  "cygusb0.dll" v0.0 ts=2009/7/8 18:35
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                  "cygWindowsWM-7.dll" v0.0 ts=2009/10/15 4:48
   28k 2010/03/28 C:\cygwin\bin\cygwrap-0.dll - os=4.0 img=1.0 sys=4.0
                  "cygwrap-0.dll" v0.0 ts=2010/3/28 20:02
 1040k 2010/02/10 C:\cygwin\bin\cygX11-6.dll - os=4.0 img=1.0 sys=4.0
                  "cygX11-6.dll" v0.0 ts=2010/2/10 11:42
    9k 2009/09/03 C:\cygwin\bin\cygXau-6.dll - os=4.0 img=1.0 sys=4.0
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  251k 2009/10/19 C:\cygwin\bin\cygXaw-6.dll - os=4.0 img=1.0 sys=4.0
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  122k 2009/10/15 C:\cygwin\bin\cygxkbfile-1.dll - os=4.0 img=1.0 sys=4.0
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                  "cygXm-2.dll" v0.0 ts=2010/1/21 18:32
  453k 2008/11/25 C:\cygwin\bin\cygXmHTML-0.dll - os=4.0 img=1.0 sys=4.0
                  "cygXmHTML-0.dll" v0.0 ts=2008/11/26 7:30
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   53k 2009/10/14 C:\cygwin\bin\cygXpm-4.dll - os=4.0 img=1.0 sys=4.0
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   25k 2009/03/20 C:\cygwin\bin\cygXrandr-2.dll - os=4.0 img=1.0 sys=4.0
                  "cygXrandr-2.dll" v0.0 ts=2009/3/13 18:05
   30k 2009/10/14 C:\cygwin\bin\cygXrender-1.dll - os=4.0 img=1.0 sys=4.0
                  "cygXrender-1.dll" v0.0 ts=2009/10/14 18:40
  277k 2009/10/14 C:\cygwin\bin\cygXt-6.dll - os=4.0 img=1.0 sys=4.0
                  "cygXt-6.dll" v0.0 ts=2009/10/14 14:02
   18k 2009/10/14 C:\cygwin\bin\cygXtst-6.dll - os=4.0 img=1.0 sys=4.0
                  "cygXtst-6.dll" v0.0 ts=2009/10/14 16:30
   64k 2009/03/02 C:\cygwin\bin\cygz.dll - os=4.0 img=1.0 sys=4.0
                  "cygz.dll" v0.0 ts=2009/3/2 12:33
 2419k 2009/12/07 C:\cygwin\bin\cygwin1.dll - os=4.0 img=1.0 sys=4.0
                  "cygwin1.dll" v0.0 ts=2009/12/7 21:48
    Cygwin DLL version info:
        DLL version: 1.7.1
        DLL epoch: 19
        DLL old termios: 5
        DLL malloc env: 28
        Cygwin conv: 181
        API major: 0
        API minor: 218
        Shared data: 5
        DLL identifier: cygwin1
        Mount registry: 3
        Cygwin registry name: Cygwin
        Program options name: Program Options
        Installations name: Installations
        Cygdrive default prefix: 
        Build date: Mon Dec 7 11:48:55 CET 2009
        Shared id: cygwin1S5


No Cygwin services found.


Cygwin Package Information
Last downloaded files to: 
Last downloaded files from: 

Package                        Version
_update-info-dir               00885-1
alternatives                   1.3.30c-10
apache                         1.3.33-2
apache2                        2.2.6-1
apache2-devel                  2.2.6-1
apache2-manual                 2.2.6-1
aria2                          0.13.1+1-1
aspell                         0.60.5-1
aspell-en                      6.0.0-1
attr                           2.4.43-1
autoconf                       8-1
autoconf2.1                    2.13-10
autoconf2.5                    2.65-1
automake                       4-10
automake1.10                   1.10.3-1
automake1.11                   1.11.1-1
automake1.4                    1.4p6-10
automake1.5                    1.5-10
automake1.6                    1.6.3-11
automake1.7                    1.7.9-10
automake1.8                    1.8.5-10
automake1.9                    1.9.6-10
autossh                        1.4b-1
base-cygwin                    2.1-1
base-files                     3.9-3
base-passwd                    3.1-1
bash                           3.2.49-23
bash-completion                1.1-2
binutils                       2.20.51-2
bison                          2.4.2-1
boost                          1.33.1-4
boost-devel                    1.33.1-4
brltty                         4.1-1
bsflite                        0.82-2
bzip2                          1.0.5-10
cadaver                        0.23.2-1
ccache                         2.4-1
chere                          1.1-1
chkconfig                      1.3.30a-1
cocom                          0.995-1
colordiff                      1.0.9-1
colorgcc                       1.3.2-2
compface                       1.5.2-1
coreutils                      8.4-2
corkscrew                      2.0-1
cpio                           2.11-1
cppcheck                       1.42-1
cron                           4.1-59
crypt                          1.1-1
csih                           0.9.1-1
ctags                          5.8-1
curl                           7.19.6-1
cvs                            1.12.13-10
cvs2svn                        2.1.1-1
cvsps                          2.2b1-1
cygrunsrv                      1.34-1
cygutils                       1.4.2-1
cygwin                         1.7.5-1
cygwin-doc                     1.7-1
cygwin-x-doc                   1.1.0-1
dash                           0.5.5.1-2
db2                            2.7.7-5
db3.1                          3.1.17-3
db3.3                          3.3.11.2-1
db4.0                          4.0.14-1
db4.1                          4.1.25.3-2
db4.2                          4.2.52.5-2
db4.3                          4.3.29.1-1
db4.4                          4.4.20.4-1
db4.5                          4.5.20.2-2
dbus                           1.2.16-1
ddd                            3.3.9-1
dhttpd                         1.02a-1
diffstat                       1.51-1
diffutils                      2.9-1
dmalloc                        5.4.2-2
e2fsprogs                      1.35-3
editrights                     1.01-2
ELFIO                          1.0.2-1
emacs                          23.1-10
emacs-el                       23.1-10
emacs-X11                      23.1-10
expat                          2.0.1-1
fcgi                           2.4.0-2
file                           5.04-1
findutils                      4.5.5-1
fixesproto                     4.1.1-1
flex                           2.5.35-1
font-adobe-dpi75               1.0.1-1
font-alias                     1.0.2-1
font-bh-dpi75                  1.0.1-1
font-bh-lucidatypewriter-dpi75 1.0.1-1
font-dec-misc                  1.0.1-1
font-encodings                 1.0.3-1
font-misc-misc                 1.1.0-1
fontconfig                     2.8.0-1
gamin                          0.1.10-10
gawk                           3.1.7-1
gcc-core                       3.4.4-999
gcc-g++                        3.4.4-999
gcc-java                       3.4.4-999
gcc-mingw-core                 20050522-1
gcc-mingw-g++                  20050522-1
gcc-mingw-java                 20050522-1
gcc4                           4.3.4-3
gcc4-core                      4.3.4-3
gcc4-g++                       4.3.4-3
gcc4-java                      4.3.4-3
gcc4-objc                      4.3.4-3
gdb                            6.8-2
gdbm                           1.8.3-20
gettext                        0.17-11
git                            1.7.0.4-2
git-completion                 1.7.0.4-2
git-gui                        1.7.0.4-2
git-svn                        1.7.0.4-2
gitk                           1.7.0.4-2
grep                           2.5.4-2
groff                          1.20.1-1
guilt                          0.27-1
gzip                           1.3.12-2
help2man                       1.36.4-11
httping                        1.2.5-1
inetutils                      1.7-1
initscripts                    0.9-2
inputproto                     2.0-1
ioperm                         0.4-1
ipc-utils                      1.0-1
java-brlapi                    4.1-1
kbproto                        1.0.4-1
less                           436-1
libapr1                        1.3.8-2
libapr1-devel                  1.3.8-2
libaprutil1                    1.3.9-2
libaprutil1-devel              1.3.9-2
libaspell15                    0.60.5-1
libattr1                       2.4.43-1
libaudio-devel                 1.9.2-1
libaudio2                      1.9.2-1
libboost                       1.33.1-4
libbrlapi                      4.1-1
libbrlapi-devel                4.1-1
libbz2-devel                   1.0.5-10
libbz2_1                       1.0.5-10
libcharset1                    1.13.1-1
libcurl-devel                  7.19.6-1
libcurl4                       7.19.6-1
libdb2                         2.7.7-5
libdb2-devel                   2.7.7-5
libdb3.1                       3.1.17-3
libdb3.1-devel                 3.1.17-3
libdb3.3                       3.3.11.2-1
libdb3.3-devel                 3.3.11.2-1
libdb4.0                       4.0.14-1
libdb4.0-devel                 4.0.14-1
libdb4.1                       4.1.25.3-2
libdb4.1-devel                 4.1.25.3-2
libdb4.2                       4.2.52.5-2
libdb4.2-devel                 4.2.52.5-2
libdb4.3                       4.3.29.1-1
libdb4.3-devel                 4.3.29.1-1
libdb4.4                       4.4.20.4-1
libdb4.4-devel                 4.4.20.4-1
libdb4.5                       4.5.20.2-2
libdb4.5-devel                 4.5.20.2-2
libdbus1-devel                 1.2.16-1
libdbus1_3                     1.2.16-1
libdmx1                        1.1.0-1
libecpg-compat2                8.2.11-1
libecpg-devel                  8.2.11-1
libecpg5                       8.2.11-1
libexpat1                      2.0.1-1
libexpat1-devel                2.0.1-1
libfam0                        0.1.10-10
libfcgi-devel                  2.4.0-2
libfcgi0                       2.4.0-2
libffi4                        4.3.4-3
libfontconfig-devel            2.8.0-1
libfontconfig1                 2.8.0-1
libfontenc1                    1.0.5-1
libfreetype-devel              2.3.12-1
libfreetype6                   2.3.12-1
libgc                          6.4-1
libgcc1                        4.3.4-3
libgcj-common                  4.3.4-3
libgcj9                        4.3.4-3
libgcrypt11                    1.4.5-1
libgdbm                        1.8.0-5
libgdbm-devel                  1.8.3-20
libgdbm3                       1.8.3-3
libgdbm4                       1.8.3-20
libgif4                        4.1.6-10
libGL1                         7.6.1-1
libglib2.0-devel               2.22.4-2
libglib2.0_0                   2.22.4-2
libgmp3                        4.3.1-3
libgomp1                       4.3.4-3
libgpg-error0                  1.7-1
libICE-devel                   1.0.6-1
libICE6                        1.0.6-1
libiconv                       1.13.1-1
libiconv2                      1.13.1-1
libicu38                       3.8-7
libidn-devel                   1.16-1
libidn11                       1.16-1
libintl3                       0.14.5-1
libintl8                       0.17-11
libjbig2                       2.0-11
libjpeg62                      6b-21
libjpeg7                       7-10
liblcms1                       1.19-1
libltdl7                       2.2.7a-15
liblzma1                       4.999.9beta-11
libmng1                        1.0.10-1
libmpfr1                       2.4.1-4
libncurses10                   5.7-18
libncurses7                    5.3-4
libncurses8                    5.5-10
libncurses9                    5.7-16
libncursesw10                  5.7-18
libneon-devel                  0.29.0-1
libneon27                      0.29.0-1
libobjc2                       4.3.4-3
libopenldap2_3_0               2.3.43-1
libpcre-devel                  8.00-1
libpcre0                       8.00-1
libpgtypes2                    8.2.11-1
libpixman1_0                   0.18.0-1
libpng12                       1.2.35-10
libpng12-devel                 1.2.35-10
libpopt0                       1.6.4-4
libpq-devel                    8.2.11-1
libpq3                         7.4.5-1
libpq4                         8.2.5-1
libpq5                         8.2.11-1
libpthread-stubs               0.2-1
libQtCore4                     4.5.3-1
libQtCore4-devel               4.5.3-1
libQtGui4                      4.5.3-1
libQtGui4-devel                4.5.3-1
libQtNetwork4                  4.5.3-1
libQtNetwork4-devel            4.5.3-1
libQtWebKit4                   4.5.3-1
libQtWebKit4-devel             4.5.3-1
libQtXml4                      4.5.3-1
libreadline6                   5.2.14-12
libreadline7                   6.0.3-2
libsasl2                       2.1.19-3
libserf0-devel                 0.3.1-1
libserf0_0                     0.3.1-1
libsigsegv2                    2.8-1
libSM-devel                    1.1.1-1
libSM6                         1.1.1-1
libsqlite3-devel               3.6.21-3
libsqlite3_0                   3.6.21-3
libssh2-devel                  1.2.2-1
libssh2_1                      1.2.2-1
libssp0                        4.3.4-3
libstdc++6                     4.3.4-3
libstdc++6-devel               4.3.4-3
libtiff5                       3.9.2-1
libtool                        2.2.7a-15
libusb-win32                   0.1.12.2-1
libWindowsWM7                  1.0.1-1
libwrap0                       7.6-21
libX11-devel                   1.3.3-1
libX11_6                       1.3.3-1
libXau-devel                   1.0.5-1
libXau6                        1.0.5-1
libXaw-devel                   1.0.7-1
libXaw3d-devel                 1.5D-8
libXaw3d7                      1.5D-8
libXaw6                        1.0.7-1
libXaw7                        1.0.7-1
libxcb-devel                   1.5-1
libxcb1                        1.5-1
libXcomposite1                 0.4.1-1
libXcursor-devel               1.1.10-1
libXcursor1                    1.1.10-1
libXdmcp-devel                 1.0.3-1
libXdmcp6                      1.0.3-1
libXext-devel                  1.1.1-1
libXext6                       1.1.1-1
libXfixes-devel                4.0.4-1
libXfixes3                     4.0.4-1
libXft2                        2.1.14-1
libXi-devel                    1.3-1
libXi6                         1.3-1
libXinerama-devel              1.1-1
libXinerama1                   1.1-1
libxkbfile1                    1.0.6-1
libXm2                         0.95.2-2
libXmHTML0                     1.1.7-3
libxml2                        2.7.6-1
libXmu-devel                   1.0.5-1
libXmu6                        1.0.5-1
libXmuu1                       1.0.5-1
libXpm-devel                   3.5.8-1
libXpm4                        3.5.8-1
libXrandr-devel                1.3.0-10
libXrandr2                     1.3.0-10
libXrender-devel               0.9.5-1
libXrender1                    0.9.5-1
libXt-devel                    1.0.8-1
libXt6                         1.0.8-1
libXtst6                       1.1.0-1
lighttpd                       1.4.20-1
links                          1.00pre20-1
login                          1.10-10
luit                           1.0.5-1
lynx                           2.8.5-4
m4                             1.4.14-1
make                           3.81-2
man                            1.6e-1
md5deep                        3.6-1
micro-httpd                    20011214-1
mingw-runtime                  3.18-1
minires                        1.02-1
mintty                         0.6.1-1
mkfontdir                      1.0.5-1
mkfontscale                    1.0.7-1
naim                           0.11.8.2.1-2
nano                           2.0.9-1
ncurses                        5.7-18
neon                           0.29.0-1
odt2txt                        0.3+git20070827-1
openssh                        5.5p1-1
openssl                        0.9.8n-1
openssl-devel                  0.9.8n-1
patch                          2.5.8-9
patchutils                     0.3.1-1
perl                           5.10.1-3
perl-Error                     0.17016-1
perl-Locale-gettext            1.05-11
ping                           1.0-1
pkg-config                     0.23b-10
postgresql                     8.2.11-1
postgresql-client              8.2.11-1
postgresql-contrib             8.2.11-1
postgresql-devel               8.2.11-1
postgresql-doc                 8.2.11-1
postgresql-plperl              8.2.11-1
postgresql-plpython            8.2.11-1
procps                         3.2.7-1
psmisc                         21.5-3
python                         2.5.5-1
python-brlapi                  4.1-1
randrproto                     1.3.1-1
rebase                         3.0.1-1
renderproto                    0.11-1
rsync                          3.0.7-1
ruby                           1.8.7-p72-2
run                            1.1.12-11
sed                            4.2.1-1
snownews                       1.5.7-1
splint                         3.1.1-2
sqlite3                        3.6.21-3
squid                          2.6.STABLE17-1
subversion                     1.6.9-2
subversion-apache2             1.6.9-2
subversion-devel               1.6.9-2
subversion-perl                1.6.9-2
subversion-python              1.6.9-2
subversion-ruby                1.6.9-2
subversion-tools               1.6.9-2
sysvinit                       2.86-10
t1lib5                         5.1.2-10
tar                            1.22.90-1
tcl-brlapi                     4.1-1
tcl-db3.1                      3.1.17-3
tcl-db3.3                      3.3.11.2-1
tcl-db4.0                      4.0.14-1
tcl-db4.1                      4.1.25.3-2
tcl-db4.2                      4.2.52.5-2
tcl-db4.3                      4.3.29.1-1
tcl-db4.4                      4.4.20.4-1
tcl-db4.5                      4.5.20.2-2
tcltk                          20080420-1
terminfo                       5.7_20091114-14
terminfo0                      5.5_20061104-12
texinfo                        4.13-3
tidy                           041206-1
tzcode                         2009k-1
util-linux                     2.14.1-1
w32api                         3.14-1
w3m                            0.5.1-2
webcheck                       1.10.1-1
wget                           1.11.4-4
which                          2.20-2
wput                           0.6.1-2
wtf                            0.0.4-7
X-start-menu-icons             1.0.4-1
xauth                          1.0.4-1
xbrlapi                        4.1-1
xclipboard                     1.1.0-1
xclock                         1.0.4-1
xconsole                       1.0.3-2
xcursor-themes                 1.0.2-1
xdpyinfo                       1.1.0-1
xedit                          1.1.2-1
xemacs                         21.4.22-1
xemacs-emacs-common            21.4.22-1
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[-- Attachment #5: fork_throw_testcases.cpp --]
[-- Type: application/octet-stream, Size: 3622 bytes --]

//fork/throw SEGFAULT issue

//a SEGFAULT occurs under these circumstances only:
// 1. compile with g++-4 (4.3.4 20090804) on cygwin 1.7.5-1
//      - g++-3 does not have this issue, and cyg 1.7.4-1 were intermittent(?)
// 2. fork at least once
// 3. enter try block in parent (before fork) or child
// 4. throw a derived exception class in the child
// 5. where the derived class contains a std::string member
// 6. catch std::exception
//To see the SEGFAULT, you will need error_start=dumper.exe 
//or something similar in the CYGWIN environmental variable



//set to -1 to disable forking
//must fork to crash
#define FORK_LIMIT 1



//enter the try block in the parent but throw in the child
//both versions crash
#define TRY_BEFORE_FORK 1



//0 means throw in parent
//must throw in child to crash
#define THROW_IN_CHILD 1



//these crash
//#define EXCEPTION_ stringexcept(string("exception"))
#define EXCEPTION_ stringexcept()

//these don't crash
//#define EXCEPTION_ exception()
//#define EXCEPTION_ string("exception")
//#define EXCEPTION_ "exception"



//this doesn't crash
//#define CATCH_TYPE stringexcept

//these crash
#define CATCH_TYPE exception
//#define CATCH_TYPE exception&

//this doesn't crash
//#define CATCH_TYPE string
//#define CATCH_TYPE const char *



//define destructor inline
//both crash
#define INLINE_DESTRUCTOR 1



//derived exception class has a std::string member
#define USE_STRING 1



//printing has no impact on the SEGFAULT

//control debugging and exception output
#define PRINT_EXCEPTION 0

#define PRINT_DEBUG 0



#include <iostream>
#include <exception>

#include <cstdlib>

#include <sys/types.h>
#include <unistd.h>

using namespace std;



class stringexcept : public exception {

public:

  stringexcept() : exception()
#if USE_STRING
                         ,_what()
#endif
  {
  }

  stringexcept(string s) : exception() 
#if USE_STRING
                         ,_what(s)
#endif
  {
  }

  virtual ~stringexcept() throw()
#if INLINE_DESTRUCTOR
  {}
#else
  ;
#endif

#if USE_STRING

  //overriding what() makes no difference
  //virtual const char* what() const throw() {
  //  return _what.c_str();
  //}

protected:

  string _what;

#endif

};


#if !INLINE_DESTRUCTOR
stringexcept::~stringexcept() throw() {}
#endif



int main(int, char**) {

#if TRY_BEFORE_FORK
  try {
#endif

    pid_t orig_pid = getpid();
    
    int fork_count = 0;

    while (fork_count < FORK_LIMIT) {

      pid_t pid = fork();
      fork_count++;
      
      if (pid == 0) {
        
#if PRINT_DEBUG
        cerr << "fork() succeeded - child: " << getpid() << endl;
#endif
        
      } else if (pid > 0) {
        
#if PRINT_DEBUG
        cerr << "fork() succeeded - parent: " << getpid()
             << " forked child: " << pid << endl;
        cerr << "parent breaking loop" << endl;
#endif

        break;
        
      } else {
        
#if PRINT_DEBUG
        cerr << "fork() failed" << endl;
        cerr << "parent exiting" << endl;
#endif
        
        exit(1);
        
      } //if parent/child

    } //while fork limit not exceeded


#if !TRY_BEFORE_FORK
  try {
#endif

    if (THROW_IN_CHILD == (getpid() != orig_pid)) {
#if PRINT_DEBUG
      cerr << "throwing exception" << endl;
#endif
      throw EXCEPTION_;
    }


  } catch(CATCH_TYPE e) {

#if PRINT_EXCEPTION
    //sleep causes the exception output to come last
    //after a large series of fork()s
    //sleep(5);

    //overriding what() makes no difference
    cerr << "Exception: " //<< e.what() 
         << " in pid: " << getpid() << endl;
    cerr << endl;
#endif

  }
    
  return 0;
}


[-- Attachment #6: Type: text/plain, Size: 218 bytes --]

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^ permalink raw reply	[flat|nested] 3+ messages in thread

* Re: 1.7.5-1: fork throw segfault with g++ 4.3.4
  2010-04-27  7:02 1.7.5-1: fork throw segfault with g++ 4.3.4 Tim Wilson-Brown
@ 2010-05-04 18:31 ` Dave Korn
  2010-05-07 21:38 ` Christopher Faylor
  1 sibling, 0 replies; 3+ messages in thread
From: Dave Korn @ 2010-05-04 18:31 UTC (permalink / raw)
  To: cygwin

On 27/04/2010 08:02, Tim Wilson-Brown wrote:
> Hi,
> 
> I have identified a reproducible segfault when throwing exceptions in the
> thrift IPC library under cygwin 1.7.5-1.

  Thanks for the simple testcase :)

  I have debugged what is happening, and it appears that the typeinfo for the
stringexcept class is getting corrupted in the child process, apparently
because a pseudo-reloc is being applied twice.  I will debug this further
shortly and figure out a fix; it also appears that the problem will be masked
in the upcoming gcc-4.5.0 release (as a side-effect of the fact that the new
libstdc++ dll will export typeinfos directly, rather than leaving them as
static objects in the libstdc++ import library as is the practice in the 4.3.4
release; this avoids needing a pseudo-reloc, apparently, but the bug would
presumably still turn up in other circumstances.)

    cheers,
      DaveK




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^ permalink raw reply	[flat|nested] 3+ messages in thread

* Re: 1.7.5-1: fork throw segfault with g++ 4.3.4
  2010-04-27  7:02 1.7.5-1: fork throw segfault with g++ 4.3.4 Tim Wilson-Brown
  2010-05-04 18:31 ` Dave Korn
@ 2010-05-07 21:38 ` Christopher Faylor
  1 sibling, 0 replies; 3+ messages in thread
From: Christopher Faylor @ 2010-05-07 21:38 UTC (permalink / raw)
  To: cygwin

On Tue, Apr 27, 2010 at 05:02:26PM +1000, Tim Wilson-Brown wrote:
>I have identified a reproducible segfault when throwing exceptions in
>the thrift IPC library under cygwin 1.7.5-1.
>
>An example c++ program is attached which always segfaults on my machine
>when compiled with g++-4 (4.3.4 20090804) under 1.7.5-1.  I have also
>attached the stackdump, a standard cygcheck.out, and another more
>verbose set of testcases.

I've uploaded a snapshot which should fix this problem:

http://cygwin.com/snapshots/

Thanks go to Dave Korn for tracking down the problem and to Chuck Wilson
for the pseudo-reloc implementation and insight.

Oh, and thanks for the test case, too.

cgf

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^ permalink raw reply	[flat|nested] 3+ messages in thread

end of thread, other threads:[~2010-05-07 21:38 UTC | newest]

Thread overview: 3+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2010-04-27  7:02 1.7.5-1: fork throw segfault with g++ 4.3.4 Tim Wilson-Brown
2010-05-04 18:31 ` Dave Korn
2010-05-07 21:38 ` Christopher Faylor

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