[Bug libgcj/50057] New: [4.7 regression] SIGSEGV in natObject.cc:58

[Bug libgcj/50057] New: [4.7 regression] SIGSEGV in natObject.cc:58

[jojelino at gmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50057

             Bug #: 50057
           Summary: [4.7 regression] SIGSEGV in natObject.cc:58
    Classification: Unclassified
           Product: gcc
           Version: 4.7.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: libgcj
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: jojelino@gmail.com
              Host: i686-pc-cygwin
            Target: i686-pc-mingw32
             Build: i686-pc-cygwin


Created attachment 24992
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=24992
try to resolve 'o1' class on runtime, and got sigsegv

when referenced class(oo1) is not found in classpath, it throwed
classnotfoundexception.
but it sigsegved 

Starting program: /usr/i686-pc-mingw32/java/bin/i686-pc-mingw32-gij -cp .
foobar --verbose
[New Thread 7704.0x1af8]
[New Thread 7704.0x2b60]

Program received signal SIGSEGV, Segmentation fault.
0x696cfc4a in java::lang::Object::getClass (this=0x0)
    at ../.././libjava/java/lang/natObject.cc:58
58        return (*dt)->clas;
(gdb) bt
#0  0x696cfc4a in java::lang::Object::getClass (this=0x0)
    at ../.././libjava/java/lang/natObject.cc:58
#1  0x696b8bbf in _Jv_InterpMethod::check_handler (this=0xe12f60, pc=0x22e8d8,
    meth=0xe12f60, ex=0x0) at ../.././libjava/interpret.cc:1463
#2  0x696a99f5 in _Jv_InterpMethod::run (retp=0x22f104, args=0x22f124,
    meth=0xe12f60) at ../.././libjava/interpret-run.cc:2676
#3  0x696a2251 in _Jv_InterpMethod::run_normal (ret=0x22f104, args=0x22f124,
    __this=0xe12f60) at ../.././libjava/interpret.cc:358
#4  0x6a432ee5 in ffi_closure_raw_SYSV () at ../.././libffi/src/x86/win32.S:695
#5  0x6a432d37 in ffi_call_win32 () at ../.././libffi/src/x86/win32.S:424
#6  0x6a432d13 in ffi_raw_call (cif=0xbf0b24, fn=0xe30098, rvalue=0x22f4e0,
    fake_avalue=0x22f1c0) at ../.././libffi/src/x86/ffi.c:647
#7  0x696a351f in _Jv_InterpMethod::run (retp=0x22fd20, args=0x22fd40,
    meth=0xab8e60) at ../.././libjava/interpret-run.cc:611
#8  0x696a237a in _Jv_InterpMethod::run_class (ret=0x22fd20, args=0x22fd40,
    __this=0xab8e60) at ../.././libjava/interpret.cc:407
#9  0x6a432ee5 in ffi_closure_raw_SYSV () at ../.././libffi/src/x86/win32.S:695
#10 0x696c282c in gnu::java::lang::MainThread::call_main (this=0xbfdf60)
    at ../.././libjava/gnu/java/lang/natMainThread.cc:54
#11 0x6973c37d in gnu.java.lang.MainThread.run()void (this=@bfdf60)
    at /tmp/gcc/libjava/gnu/java/lang/MainThread.java:106
#12 0x696d4d4d in _Jv_ThreadRun (thread=0xbfdf60)
    at ../.././libjava/java/lang/natThread.cc:335
---Type <return> to continue, or q <return> to quit---
#13 0x69684e9b in _Jv_RunMain (vm_args=0x22fef4, klass=0x0,
    name=0x3d8925 "foobar", argc=0x2, argv=0x3d89fc, is_jar=0x0)
    at ../.././libjava/prims.cc:1789
#14 0x66bc24b0 in _fu0___ZN3gcj13verifyClassesE ()
    at ../.././libjava/gij.cc:333
#15 0x004010fd in __mingw_CRTStartup () at ../../.././winsup/mingw/crt1.c:244
#16 0x00000408 in ?? ()
#17 0x7ffd4000 in ?? ()
#18 0x00000000 in ?? ()
(gdb)

and _Jv_Throw doesn't seem to pass throwable as argument of
unwind_raiseexception, as a consequence, catch(Throwable e){someoperaton(e);}
leads SIGSEGV.

[Bug libgcj/50057] [4.7 regression] SIGSEGV in natObject.cc:58

[rguenth at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50057

Richard Guenther <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Target Milestone|---                         |4.7.0

[Bug libgcj/50057] [4.7 regression] SIGSEGV in natObject.cc:58

[rguenth at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50057

Richard Guenther <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Priority|P3                          |P4

[Bug libgcj/50057] [4.7 regression] SIGSEGV in natObject.cc:58

[ktietz at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50057

Kai Tietz <ktietz at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |ktietz at gcc dot gnu.org

--- Comment #1 from Kai Tietz <ktietz at gcc dot gnu.org> 2011-12-17 21:54:05 UTC ---
Hmm, this might be a duplicate for already fixed PR/50053.  Could you please
check, if you still have this issue here with current trunk version.

Thanks

[Bug libgcj/50057] [4.7 regression] SIGSEGV in natObject.cc:58

[jojelino at gmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50057

--- Comment #2 from gee <jojelino at gmail dot com> 2012-01-18 06:14:17 UTC ---
(In reply to comment #1)
> Hmm, this might be a duplicate for already fixed PR/50053.  Could you please
> check, if you still have this issue here with current trunk version.
> 
> Thanks

Starting program: /tmp/gcc/i686-pc-mingw32/libjava/.libs/gij.exe
/tmp/gcc/libjava/testsuite/libjava.lang/foobar.class
[New Thread 9088.0x1188]
[New Thread 9088.0x2760]
[Inferior 1 (process 9088) exited with code 01]
(gdb)
just exists with silent message. without sigsegv

[Bug libgcj/50057] [4.7 regression] misalignment of java_exception_header resulted in throwable to be null

[jojelino at gmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50057

gee <jojelino at gmail dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Summary|[4.7 regression] SIGSEGV in |[4.7 regression]
                   |natObject.cc:58             |misalignment of
                   |                            |java_exception_header
                   |                            |resulted in throwable to be
                   |                            |null
           Severity|normal                      |major

--- Comment #3 from gee <jojelino at gmail dot com> 2012-01-18 06:20:40 UTC ---
in libjava/exception.cc
  /* The object being thrown.  Compiled code expects this to be immediately
     before the generic exception header.  Which is complicated by the fact
     that _Unwind_Exception is ((aligned)).  */


Starting program: /tmp/gcc/i686-pc-mingw32/libjava/testsuite/.libs/PR218
[New Thread 6064.0x1e4c]

Breakpoint 13, _Jv_Throw (value=0xa9ba08) at ../.././libjava/exception.cc:118
118       _Unwind_RaiseException (&xh->unwindHeader);
(gdb) p ((int)&xh->unwindHeader-(int)&xh->value)
$19 = 0xc

It seems that padding was unsuccessful.

following is version info.

Using built-in specs.
COLLECT_GCC=gcc
COLLECT_LTO_WRAPPER=/usr/libexec/gcc/i686-pc-cygwin/4.7.0/lto-wrapper.exe
Target: i686-pc-cygwin
Configured with: ./configure --config-cache --prefix=/usr
--disable-win32-registry --enable-threads=win32
--enable-languages=c,c++,lto,fortran --with-win32-nlsapi=unicode --enable-tls
--disable-bootstrap --enable-shared --disable-sjlj-exceptions --enable-gomp
--enable-cloog-backend=isl LTLDFLAGS=-no-undefined
lt_cv_deplibs_check_method=pass_all : (reconfigured) ./configure --config-cache
--prefix=/usr --disable-win32-registry --enable-threads=win32
--enable-languages=c,c++,lto,fortran --with-win32-nlsapi=unicode --enable-tls
--disable-bootstrap --enable-shared --disable-sjlj-exceptions --enable-gomp
--enable-cloog-backend=isl LTLDFLAGS=-no-undefined
lt_cv_deplibs_check_method=pass_all
Thread model: win32
gcc version 4.7.0 20120114 (experimental) (GCC)

[Bug libgcj/50057] [4.7 regression] misalignment of java_exception_header resulted in throwable to be null

[ktietz at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50057

--- Comment #5 from Kai Tietz <ktietz at gcc dot gnu.org> 2012-02-10 19:19:56 UTC ---
Hmm, I assume issue is related to using of -mms-bitfields for 4.7 for
windows-targets.

Does the following patch fix the issue?

Index: exception.cc
===================================================================
--- exception.cc        (revision 184105)
+++ exception.cc        (working copy)
@@ -33,12 +33,18 @@
 }
 #include "unwind.h"

+#ifdef __MINGW32__
+__attribute__ ((gcc_struct))
+#endif
 struct alignment_test_struct
 {
   char space;
   char end[0] __attribute__((aligned));
 };

+#ifdef __MINGW32__
+__attribute__ ((gcc_struct))
+#endif
 struct java_exception_header
 {
   /* Cache handler details between Phase 1 and Phase 2.  */

[Bug libgcj/50057] [4.7 regression] misalignment of java_exception_header resulted in throwable to be null

[ktietz at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50057

Kai Tietz <ktietz at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2012-02-10
     Ever Confirmed|0                           |1

[Bug libgcj/50057] [4.7 regression] misalignment of java_exception_header resulted in throwable to be null

[ktietz at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50057

--- Comment #6 from Kai Tietz <ktietz at gcc dot gnu.org> 2012-02-14 20:26:01 UTC ---
Hmm, this might be a duplicate of PR52238

[Bug libgcj/50057] [4.7 regression] misalignment of java_exception_header resulted in throwable to be null

[ktietz at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50057

Kai Tietz <ktietz at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |WAITING

--- Comment #7 from Kai Tietz <ktietz at gcc dot gnu.org> 2012-02-22 12:35:04 UTC ---
Could you please retest this bug.  I assume it is a duplicate of PR52238, which
was recently fixed.

[Bug libgcj/50057] [4.7 regression] misalignment of java_exception_header resulted in throwable to be null

[jojelino at gmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50057

gee <jojelino at gmail dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|WAITING                     |RESOLVED
         Resolution|                            |FIXED

--- Comment #8 from gee <jojelino at gmail dot com> 2012-02-22 16:13:41 UTC ---
(In reply to comment #7)
> Could you please retest this bug.  I assume it is a duplicate of PR52238, which
> was recently fixed.

yes, it's fixed. thank you.

[Bug libgcj/50057] [4.7 regression] misalignment of java_exception_header resulted in throwable to be null

[ktietz at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50057

Kai Tietz <ktietz at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
         Resolution|FIXED                       |DUPLICATE

--- Comment #9 from Kai Tietz <ktietz at gcc dot gnu.org> 2012-02-22 16:28:40 UTC ---
mark as duplicate of 52238

*** This bug has been marked as a duplicate of bug 52238 ***