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Date: Tue, 8 Aug 2006 11:06:20 -0400
From: Christopher Faylor <cgf-no-personal-reply-please AT cygwin DOT com>
To: cygwin AT cygwin DOT com
Subject: Re: crashes with various programs
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On Tue, Aug 08, 2006 at 10:08:32AM +0200, Dr. Volker Zell wrote:
>Hi
>
>pstree also crashes for me after running cygwin for quite a while.
>I usually startup X, 3 rxvt windows and xemacs. In the beginning pstree
>works just fine, but from a certain point in time it starts crashing.
>As soon as pstree shows this behaviour, I see the following when typing
>ps -ef:
>
>   vzell    3944    1576   ?    Aug  7 <defunct>
>   vzell     128    3944   0    Aug  5 /usr/bin/bash
>   vzell    2204    4860   ?  16:00:21 <defunct>
>   vzell    2200    2204   1    Aug  5 /usr/bin/bash
>   vzell     256    1328   ?    Aug  6 <defunct>
>   vzell    3572     256   2    Aug  5 /usr/bin/bash
>
>The rxvt processes seem to be defunct, also i can still working in them.
>When typing exit in either one of the rxvt windows, they hang.
>
>
>
>Here is a gdb run with a cygwin1.dll compiled from CVS from 31.07.2006
>The corresponding cygwin1.dbg is also under /bin.
>
>
>09:43 AM [530]> gdb pstree
>GNU gdb 6.5.50.20060706-cvs (cygwin-special)
>Copyright (C) 2006 Free Software Foundation, Inc.
>GDB is free software, covered by the GNU General Public License, and you are
>welcome to change it and/or distribute copies of it under certain conditions.
>Type "show copying" to see the conditions.
>There is absolutely no warranty for GDB.  Type "show warranty" for details.
>This GDB was configured as "i686-pc-cygwin"...(no debugging symbols found)
>
>(gdb) r
>Starting program: /usr/bin/pstree.exe 
>Loaded symbols for /c/WINDOWS/system32/ntdll.dll
>Loaded symbols for /c/WINDOWS/system32/kernel32.dll
>Loaded symbols for /usr/bin/cygwin1.dll
>Loaded symbols for /c/WINDOWS/system32/advapi32.dll
>Loaded symbols for /c/WINDOWS/system32/rpcrt4.dll
>Loaded symbols for /usr/bin/cygintl-3.dll
>Loaded symbols for /usr/bin/cygiconv-2.dll
>Loaded symbols for /usr/bin/cygncurses-8.dll
>      3 [main] pstree 5140 _cygtls::handle_exceptions: Exception: STATUS_ACCESS_VIOLATION
>
>Program received signal SIGTRAP, Trace/breakpoint trap.
>0x7c901231 in ntdll!DbgUiConnectToDbg () from /c/WINDOWS/system32/ntdll.dll
>(gdb) bt
>#0  0x7c901231 in ntdll!DbgUiConnectToDbg () from /c/WINDOWS/system32/ntdll.dll
>#1  0x6100556a in break_here () at /usr/local/src/cygwin/src/winsup/cygwin/dcrt0.cc:542
>#2  0x6101d493 in try_to_debug (waitloop=false) at /usr/local/src/cygwin/src/winsup/cygwin/exceptions.cc:349
>#3  0x6101e0d7 in _cygtls::handle_exceptions (e=0x22c05c, frame=0x22ce68, in=0x22c078) at /usr/local/src/cygwin/src/winsup/cygwin/exceptions.cc:621
>#4  0x7c9037bf in ntdll!RtlCopyOutOfProcessMemoryStreamTo () from /c/WINDOWS/system32/ntdll.dll
>#5  0x0022c05c in ?? ()
>#6  0x0022ce68 in ?? ()
>#7  0x0022c078 in ?? ()
>#8  0x0022c030 in ?? ()
>#9  0x0022ce68 in ?? ()
>#10 0x7c9037d8 in ntdll!RtlCopyOutOfProcessMemoryStreamTo () from /c/WINDOWS/system32/ntdll.dll
>#11 0x0022ce68 in ?? ()
>#12 0x0022c044 in ?? ()
>#13 0x7c90378b in ntdll!RtlCopyOutOfProcessMemoryStreamTo () from /c/WINDOWS/system32/ntdll.dll
>#14 0x0022c05c in ?? ()
>#15 0x0022ce68 in ?? ()
>#16 0x0022c078 in ?? ()
>#17 0x0022c030 in ?? ()
>#18 0x6101d77a in rtl_unwind (frame=0x22ce68, e=0x7c9037d8) at /usr/local/src/cygwin/src/winsup/cygwin/exceptions.cc:443
>Previous frame inner to this frame (corrupt stack?)
>(gdb) 

I don't see anything out of the ordinary in the above.  pstree isn't
dying.  It's just stopping at cygwin's "break_here".  Maybe you have the
CYGWIN_DEBUG environment variable set?

cgf

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