From owner-cvs-all  Sat May 15 18:13: 9 1999
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Date: Sat, 15 May 1999 20:12:50 -0500
From: Paul Saab <paul@mu.org>
To: John Birrell <jb@cimlogic.com.au>
Cc: Dag-Erling Smorgrav <des@flood.ping.uio.no>, jb@FreeBSD.ORG,
	cvs-committers@FreeBSD.ORG, cvs-all@FreeBSD.ORG
Subject: Re: cvs commit: src/lib/libc_r/uthread Makefile.inc pthread_private.h          uthread_cond.c uthread_create.c uthread_detach.c
Message-ID: <19990515201250.A12723@elvis.mu.org>
References: <xzp90aqrn1r.fsf@localhost.ping.uio.no> <199905152238.IAA11340@cimlogic.com.au>
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In-Reply-To: <199905152238.IAA11340@cimlogic.com.au>; from John Birrell on Sun, May 16, 1999 at 08:38:52AM +1000
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John Birrell (jb@cimlogic.com.au) wrote:
> Dag-Erling Smorgrav wrote:
> > John Birrell  <jb@cimlogic.com.au> writes:
> > > Paul Saab wrote:
> > > > After running mysql with this commit and watching it core dump, I
> > > > backed out this commit and then rebuilt libc_r.  After I rebuilt
> > > > it mysql works just fine.
> > > What function does mysql core dump in?
> > 
> > Better yet, can you show us a full stack trace? Did you build libc_r
> > with debugging symbols? If not, can you rebuild it with debugging
> > symbols, then tickle the bug and post a full stack trace of the
> > resulting core dump?
> 
> Actually, a full stack trace might not show much. The most common
> problem in a threaded environment is that the stack gets trashed.
> 
> I just want to know if the core dump is in a call to longjmp. If it
> is, then my guess is that the core dump is occurring after a low
> priority thread has just been joined and detached.

It is..  The stack did indeed get trashed and all I got is:
Program received signal SIGSEGV, Segmentation fault.
0x281b846b in longjmp () from /usr/lib/libc_r.so.3
(gdb) where
#0  0x281b846b in longjmp () from /usr/lib/libc_r.so.3
Error accessing memory address 0x8aa3e3c: Bad address.

paul


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