Although a cygwin package maintainer, I am a complete novice at debugging
cygwin programs, so please bear with me.
The current cygwin1.dll snapshot (2006.01.12) causes octave (a package I
maintain) to dump core under some circumstances. I haven't been able to
isolate just what causes it. When this happens, I get the following error
message _on_exit_ :
===
octave:3 exit
Aborted (core dumped)
===
This causes octave to write an octave-core file, which apparently is not
something gdb understands, but is a binary file that octave can load to restart
a computation. I take the core dump error message to have originated in
octave, rather than cygwin.
In order to further investigate this, I tried gdb, with the following results:
===
$ gdb -q /usr/bin/octave
(no debugging symbols found)
(gdb) run
Starting program: /usr/bin/octave.exe
Program received signal SIGSEGV, Segmentation fault.
0x610ae8d8 in pthread_key_create () from /usr/bin/cygwin1.dll
(gdb)
===
I interpret this to mean a segfault has occurred even prior to any
computations. This surprises me because if I don't use gdb, I can apparently
load and exit octave, doing no computations between load and exit, without any
aborts, segfaults, or obvious error messages.
Advice on where to go from here in debugging the problem would be appreciated.
Jim Phillips
Cygwin Configuration Diagnostics
Current System Time: Fri Jan 13 17:19:18 2006
Windows 2000 Professional Ver 5.0 Build 2195 Service Pack 4
Path: C:\cygwin\usr\local\bin
C:\cygwin\bin
C:\cygwin\bin
C:\cygwin\usr\X11R6\bin
c:\WINNT\system32
c:\WINNT
c:\WINNT\System32\Wbem
c:\PROGRA~1\Eai\E-VISV~1.2\Program
'C
C:\cygwin\Program Files\Common Files\Adaptec Shared\System'
c:\MATLAB704\bin\win32
c:\MATLAB701\bin\win32
c:\matlab6p5p1\bin\win32
c:\SFU\common\
'C
C:\cygwin\Program Files\Hummingbird\Connectivity\7.00\Accessories\'
c:\Perl\bin\
c:\swish-e
c:\swish-e\lib\swish-e
c:\winnt\Microsoft.NET\Framework\v1.1.4322
c:\BIN
c:\BIN\MATLAB\BIN\WIN32
c:\BIN\MATLAB
c:\progra~1\gs\GS8.53\bin
c:\progra~1\gs\GS8.53\lib\
c:\PROGRA~1\QVCS
C:\cygwin\bin
C:\cygwin\lib\lapack
Output from C:\cygwin\bin\id.exe (nontsec)
UID: 37196(e008456) GID: 10513(Domain Users)
0(root) 544(Administrators)
545(Users)1002(PasswordPropDeny)
1001(Tivoli_Admin_Privileges)
Output from C:\cygwin\bin\id.exe (ntsec)
UID: 37196(e008456) GID: 10513(Domain Users)
0(root) 544(Administrators)
545(Users)1002(PasswordPropDeny)
1001(Tivoli_Admin_Privileges)
SysDir: C:\WINNT\system32
WinDir: C:\WINNT
USER = `e008456'
PWD = `/home/e008456'
HOME = `/home/e008456'
MAKE_MODE = `unix'
Use `-r' to scan registry
a: fd N/AN/A
c: hd NTFS 19296Mb 70% CP CS UN PA FC NTFS-WIN2K
d: hd NTFS 65538Mb 36% CP CS UN PA FC NTFS-DATA
e: hd NTFS 14331Mb 37% CP CS UN PA FC NTFS-BACK
f: hd N/AN/A
h: net NTFS350028Mb 77% CP CS UN PA FC Data-350GB
i: net NTFS104144Mb 79% CP CS UN PA FC
j: net NTFS140011Mb 93% CP CS UN PA FC
k: net NTFS208283Mb 61% CP CS UN PA FC
m: cd N/AN/A
n: cd N/AN/A
s: net NTFS208283Mb 61% CP CS UN PA FC
C:\cygwin / system binmode
C:\cygwin/bin /usr/bin system binmode
C:\cygwin/lib /usr/lib system binmode
C:\cygwin\usr\X11R6\lib\X11\fonts /usr/X11R6/lib/X11/fonts system binmode
. /cygdrive system
binmode,cygdrive
Found: C:\cygwin\bin\awk.exe
Found: C:\cygwin\bin\bash.exe
Found: C:\cygwin\bin\cat.exe
Found: C:\cygwin\bin\cp.exe
Found: C:\cygwin\bin\cpp.exe
Found: C:\cygwin\bin\find.exe
Found: C:\cygwin\bin\gcc.exe
Found: C:\cygwin\bin\gdb.exe
Found: C:\cygwin\bin\grep.exe
Found: C:\cygwin\bin\ld.exe
Found: C:\cygwin\bin\ls.exe
Found: C:\cygwin\bin\make.exe
Found: C:\cygwin\bin\mv.exe
Found: C:\cygwin\bin\rm.exe
Found: C:\cygwin\bin\sed.exe
Found: C:\cygwin\bin\sh.exe
Found: C:\cygwin\bin\tar.exe
5181k 2006/01/10 C:\cygwin\usr\local\bin\cygatlas.dll
277k 2006/01/10 C:\cygwin\usr\local\bin\cygblas.dll
4953k 2006/01/10 C:\cygwin\usr\local\bin\cyglapack.dll
56k 2005/07/09 C:\cygwin\bin\cygbz2-1.dll
7k 2005/11/20 C:\cygwin\bin\cygcharset-1.dll
7k 2003/10/19 C:\cygwin\bin\cygcrypt-0.dll
1108k 2005/10/17 C:\cygwin\bin\cygcrypto-0.9.7.dll
1042k 2005/07/07 C:\cygwin\bin\cygcrypto-0.9.8.dll
895k 2004/04/28 C:\cygwin\bin\cygdb-4.2.dll
965k 2005/05/14 C:\cygwin\bin\cygdb-4.3.dll
1156k 2004/04/28
