panic in 5.3-stable related to heavy usage and libthr

[Doug White]

Sorry for the late reply on this, reading back mail from vacation.

On Thu, 23 Dec 2004, Lucas Madar wrote:

> I updated a machine today to 5.3-STABLE and almost instantly it crashed
> when a heavily threaded program ran. (The machine was previously running
> 5.2-release).
>
> This crash is reproducible under heavy load with four threads using
> libthr -- I haven't tested any other variances on this scheme, and I
> will be testing 5.3-RELEASE tomorrow to see if it exhibits the same
> problems.

Do you have a test program that exhibits this behavior?  Have you tried it
with KSE (libpthread)?  Were you able to test on -RELEASE?

> relevant info from kgdb, with null pointer goodness.

Indeed :(

> #23 0x00000000 in ?? ()
> #24 0xc055681f in sleepq_remove_thread (sq=0x0, td=0x0) at
> /data/rootsystem/src/sys/kern/subr_sleepqueue.c:581
> #25 0xc0556a16 in sleepq_signal (wchan=0xc2b91320, flags=0, pri=-1) at
> /data/rootsystem/src/sys/kern/subr_sleepqueue.c:677
> #26 0xc053fa53 in wakeup_one (ident=0xc2b91320) at
> /data/rootsystem/src/sys/kern/kern_synch.c:266
> #27 0xc0543052 in thr_wake (td=0xc2b91000, uap=0xc2b91000) at
> /data/rootsystem/src/sys/kern/kern_thr.c:303
> #28 0xc0698c9f in syscall (frame=
>       {tf_fs = 134742063, tf_es = 134742063, tf_ds = -1078001617, tf_edi
> = 134558784, tf_esi = 135229440, tf_ebp = -1079198052, tf_isp =
> -378659468, tf_ebx = 671863452, tf_edx = 134558792, tf_ecx = 0, tf_eax =
> 443, tf_trapno = 22, tf_err = 2, tf_eip = 672179195, tf_cs = 31,
> tf_eflags = 662, tf_esp = -1079198096, tf_ss = 47}) at
> /data/rootsystem/src/sys/i386/i386/trap.c:1001
> #29 0xc0686c1f in Xint0x80_syscall () at
> /data/rootsystem/src/sys/i386/i386/exception.s:201
>
> Is this useful to anyone? I'll keep this around if you need to poke at
> any structures.
>
> - lucas
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-- 
Doug White                    |  FreeBSD: The Power to Serve
dwhite at gumbysoft.com          |  www.FreeBSD.org