[Bug gdb/14227] New: gdb hangs after entering mixed "n" and "bt" command

[Bug gdb/14227] New: gdb hangs after entering mixed "n" and "bt" command

[asmwarrior at gmail dot com]

http://sourceware.org/bugzilla/show_bug.cgi?id=14227

             Bug #: 14227
           Summary: gdb hangs after entering mixed "n" and "bt" command
           Product: gdb
           Version: HEAD
            Status: NEW
          Severity: normal
          Priority: P2
         Component: gdb
        AssignedTo: unassigned@sourceware.org
        ReportedBy: asmwarrior@gmail.com
    Classification: Unclassified


I just found that using the gdb CVS mingw build 2012-06-13, gdb will hang at
some time when I enter some command. Here is the log message:

Microsoft Windows XP [Version 5.1.2600]
(C) Copyright 1985-2001 Microsoft Corp.

E:\code\cb\test_code\gdbpython-demo\bin>gdb a.exe
GNU gdb (GDB) 7.4.50.20120613-cvs
Copyright (C) 2012 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.  Type "show copying"
and "show warranty" for details.
This GDB was configured as "mingw32".
For bug reporting instructions, please see:
<http://www.gnu.org/software/gdb/bugs/>...
Reading symbols from E:\code\cb\test_code\gdbpython-demo\bin\a.exe...done.
(gdb) b main()
Breakpoint 1 at 0x4016f3: file main.cpp, line 14.
(gdb) n
The program is not being run.
(gdb) n
The program is not being run.
(gdb) r
Starting program: E:\code\cb\test_code\gdbpython-demo\bin\a.exe
[New Thread 5556.0x1284]

Breakpoint 1, main () at main.cpp:14
14          std::map<int, std::string> m;
(gdb) e
Ambiguous command "e": echo, edit, en, enable, end, eval, exec-file, explore.
(gdb) e
Ambiguous command "e": echo, edit, en, enable, end, eval, exec-file, explore.
(gdb) n
15          m[0] = "000";
(gdb) n
16          m[1] = "111";
(gdb) bt
#0  main () at main.cpp:16
(gdb) n
18          std::list<std::string> l = {"a", "b", "c"};
(gdb) bt
#0  main () at main.cpp:18
(gdb) n
19          std::vector<std::string> v = {"a", "b", "c"};
(gdb) bt
#0  main () at main.cpp:19
(gdb) n
20          std::queue<std::string> q;
(gdb) b


Note, that when I try to enter the "bt" command in the last line, gdb just
hangs, and I can do nothing.

GDB CVS 2012-06-09 version does not have such issue.

My test code was:

#include <map>
#include <list>
#include <stack>
#include <vector>
#include <queue>
#include <string>



int main()
{

    std::map<int, std::string> m;
    m[0] = "000";
    m[1] = "111";

    std::list<std::string> l = {"a", "b", "c"};
    std::vector<std::string> v = {"a", "b", "c"};
    std::queue<std::string> q;
    q.push("a");
    q.push("b");

    std::stack<std::string> s;
    s.push("a");
    s.push("b");

    return 0;
}


The build log was:
[ 50.0%] g++.exe -Wall -g -pipe -mthreads -fexceptions -std=gnu++0x
-D__GNUWIN32__ -D__WXMSW__ -DWXUSINGDLL -DwxUSE_UNICODE      -c main.cpp -o
obj\main.o
[100.0%] g++.exe  -o bin\a.exe obj\main.o    
Output size is 603.11 KB

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[Bug win32/14227] GDB CVS HEAD Build Error under MinGW

[asmwarrior at gmail dot com]

http://sourceware.org/bugzilla/show_bug.cgi?id=14227

asmwarrior <asmwarrior at gmail dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
          Component|gdb                         |win32
            Summary|gdb hangs after entering    |GDB CVS HEAD Build Error
                   |mixed "n" and "bt" command  |under MinGW

--- Comment #1 from asmwarrior <asmwarrior at gmail dot com> 2012-06-13 09:37:15 UTC ---
Oh, this hang problem is caused my own local patch to workaround the build
failure on MinGW target. 

After I revert the three consecutive three commit by 
* 2012-06-11  Pedro Alves  <palves@redhat.com>

    * serial.c (do_serial_close): Remove early return when SCB is
    null.

Then, the gdb CVS head mingw build works Fine.

So, I will change the title to "build error" on MinGW target.

See: http://sourceware.org/ml/gdb/2012-06/msg00061.html

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[Bug win32/14227] GDB CVS HEAD Build Error under MinGW

[asmwarrior at gmail dot com]

http://sourceware.org/bugzilla/show_bug.cgi?id=14227

--- Comment #2 from asmwarrior <asmwarrior at gmail dot com> 2012-06-13 12:28:49 UTC ---
OK, this is fixed by this commit:

http://sourceware.org/ml/gdb-cvs/2012-06/msg00092.html

But there is still one left which break the mingw build.

See: http://sourceware.org/ml/gdb/2012-05/msg00051.html

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[Bug win32/14227] GDB CVS HEAD Build Error under MinGW

[keiths at redhat dot com]

http://sourceware.org/bugzilla/show_bug.cgi?id=14227

Keith Seitz <keiths at redhat dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |keiths at redhat dot com

--- Comment #3 from Keith Seitz <keiths at redhat dot com> 2012-08-14 17:39:02 UTC ---
Is this still a problem? I can successfully build mingw32 gdb from
7.5.50-20120808-cvs sources.

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[Bug win32/14227] GDB CVS HEAD Build Error under MinGW

[asmwarrior at gmail dot com]

http://sourceware.org/bugzilla/show_bug.cgi?id=14227

--- Comment #4 from asmwarrior <asmwarrior at gmail dot com> 2012-08-15 01:15:34 UTC ---
There is no build problems under msys+mingw now. At least I can build the cvs
head (7.5.50-20120814-cvs) successfully. So, this bug can be closed. Thanks.

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[Bug win32/14227] GDB CVS HEAD Build Error under MinGW

[tromey at redhat dot com]

http://sourceware.org/bugzilla/show_bug.cgi?id=14227

Tom Tromey <tromey at redhat dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
                 CC|                            |tromey at redhat dot com
         Resolution|                            |FIXED
   Target Milestone|---                         |7.5

--- Comment #5 from Tom Tromey <tromey at redhat dot com> 2012-08-15 14:30:16 UTC ---
Reported as fixed.

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