On Fri, 13 Jan 2006, James R. Phillips wrote: > 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)
FWIW, you might want to download the cygwin1.dbg file associated with the snapshot. Assuming you save it in /tmp, at this point you'd issue the command (gdb) dll-symbols /tmp/cygwin1.dbg to load the debugging symbols. If you've already downloaded the .dbg file, please ignore this. > (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. See <http://cygwin.com/ml/cygwin/2006-01/msg00464.html>. Igor -- http://cs.nyu.edu/~pechtcha/ |\ _,,,---,,_ [EMAIL PROTECTED] | [EMAIL PROTECTED] ZZZzz /,`.-'`' -. ;-;;,_ Igor Peshansky, Ph.D. (name changed!) |,4- ) )-,_. ,\ ( `'-' old name: Igor Pechtchanski '---''(_/--' `-'\_) fL a.k.a JaguaR-R-R-r-r-r-.-.-. Meow! "Las! je suis sot... -Mais non, tu ne l'es pas, puisque tu t'en rends compte." "But no -- you are no fool; you call yourself a fool, there's proof enough in that!" -- Rostand, "Cyrano de Bergerac" -- Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple Problem reports: http://cygwin.com/problems.html Documentation: http://cygwin.com/docs.html FAQ: http://cygwin.com/faq/