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

[Kris Kennaway]

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 --

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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