panic: Assertion td->td_sleepqueue != NULL failed at /usr/src/sys/kern/subr_sleepqueue.c:258

[Kris Kennaway]

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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