Date: Thu, 16 Sep 2004 16:03:27 -0400 (EDT) From: Daniel Eischen <eischen@vigrid.com> To: "Bjoern A. Zeeb" <bzeeb-lists@lists.zabbadoz.net> Cc: freebsd-threads@freebsd.org Subject: Re: assert in _lock_acquire ? Message-ID: <Pine.GSO.4.43.0409161559540.25110-100000@sea.ntplx.net> In-Reply-To: <Pine.BSF.4.53.0409161942061.16661@e0-0.zab2.int.zabbadoz.net>
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On Thu, 16 Sep 2004, Bjoern A. Zeeb wrote: > On Thu, 16 Sep 2004, Daniel Eischen wrote: > > > On Thu, 16 Sep 2004, Bjoern A. Zeeb wrote: > > > > > I am using a global mutex to serialize a longer debugging > > > output amongst threads. As this is only used for internal > > > debugging builds where I really want to see everything > > > I do not care about performance etc. > > > > Where did you introduce the global mutex? In your application > > or in libpthread or libc sources? > > application; initialized from main before any further threads started. > > > > > ------ cut ------- > > > (gdb) bt full > > > #0 _lock_acquire (lck=0x38, lu=0x80da034, prio=56) at /u1/src/src/RELENG_5/compile-20040914-1630/lib/libpthread/sys/lock.c:168 > > > i = 135110708 > > > lval = 672675788 > > > __func__ = "_lock_acquire" > > > #1 0x08076151 in mutex_handoff (curthread=0x80ee000, mutex=0x80d8980) at /u1/src/src/RELENG_5/compile-20040914-1630/lib/libpthread/thread/thr_mutex.c:1586 > > > kmbx = (struct kse_mailbox *) 0x1 > > > > The kse_mailbox has become corrupted. If you are using %gs for anything, > > that could be the cause. %gs is reserved for the threads libraries. > > also lck=0x38 looked odd to me but this my be a result of corrupted > kmbx. > > what is %gs btw ? An i386 segment register. The older NVidia drivers used %gs and thus could not work with libpthread (or libthr). Any messages from the kernel about static LDT allocation are also hints that something is using %gs. I suspect your application is using or calling something that is changing %gs. -- Dan Eischen
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