panic: Assertion td->td_sleepqueue != NULL failed at ../../../kern/subr_sleepqueue.c:270

[Kris Kennaway]

On 6.0 from yesterday with 4BSD, PREEMPTION on (yes, I know :-)

panic: Assertion td->td_sleepqueue != NULL failed at ../../../kern/subr_sleepqueue.c:270
cpuid = 1
KDB: enter: panic
KDB: stack backtrace:
kdb_backtrace(c0750a20,0,c06f1644,13b,25d3eb11) at kdb_backtrace+0x2f
mi_switch(2,0,c06f253c,252,0) at mi_switch+0x1d8
critical_exit(c07456e0,250,0,ea0a1c9c,0) at critical_exit+0xb0
intr_execute_handlers(c07456e0,ea0a1cb4,0,ea0a1cac,1) at intr_execute_handlers+0xcc
atpic_handle_intr(0) at atpic_handle_intr+0xd0
Xatpic_intr0() at Xatpic_intr0+0x20
--- interrupt, eip = 0xc0531d06, esp = 0xea0a1cf8, ebp = 0xea0a1d14 ---
sched_runnable(0,ea0a1d48,c06ee6c7,30e,0) at sched_runnable
fork_exit(c050876b,0,ea0a1d48) at fork_exit+0xc7
fork_trampoline() at fork_trampoline+0x8
--- trap 0x1, eip = 0, esp = 0xea0a1d7c, ebp = 0 ---

It hung here, as usual for SMP panics. 

Kris
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