Date: Wed, 23 Feb 2005 15:55:15 -0800 From: Kris Kennaway <kris@obsecurity.org> To: Kris Kennaway <kris@obsecurity.org> Cc: jhb@FreeBSD.org Subject: Re: panic: Assertion td->td_sleepqueue != NULL failed at /usr/src/sys/kern/subr_sleepqueue.c:258 Message-ID: <20050223235515.GA19260@xor.obsecurity.org> In-Reply-To: <20050223235405.GB19137@xor.obsecurity.org> References: <20050223235405.GB19137@xor.obsecurity.org>
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On Wed, Feb 23, 2005 at 03:54:05PM -0800, Kris Kennaway wrote:
> I got this on a 12-processor e4500 running RELENG_5:
>
> panic: Assertion td->td_sleepqueue != NULL failed at /usr/src/sys/kern/subr_sleepqueue.c:258
> cpuid = 0
> KDB: enter: panic
> [thread pid 1 tid 100003 ]
> Stopped at kdb_enter+0x38: ta %xcc, 1
> db> wh
> Tracing pid 1 tid 100003 td 0xfffff801385067b0
> panic() at panic+0x19c
> sleepq_add() at sleepq_add+0x168
> cv_wait() at cv_wait+0x174
> _sx_xlock() at _sx_xlock+0x64
> kern_wait() at kern_wait+0x3c
> wait4() at wait4+0x18
> syscall() at syscall+0x220
> -- syscall (7, FreeBSD ELF64, wait4) %o7=0x10a7b0 --
1 fffff80138505ab8 0 0 1 0004200 [SLPQ proctree 0xc03de0c8][CPU 0] init
> About the only nonstandard thing I did was set
> kern.sched.ipiwakeup.onecpu=1 which was suggested for working around
> other deadlocks. I don't recall if preemption is enabled for this
> machine (I didn't set it up). Is there any other online debugging I
> can do?
>
> Kris
>
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