Panic in 8.1 in softclock(): mutex Giant not owned at ../../../../sys/kern/kern_mutex.c:185

[Vijay Singh]

Hackers. I am hitting a panic on 8.1 in the softclock() code. Anyone seen this?

PANIC  : mutex Giant not owned at ../../../../sys/kern/kern_mutex.c:185

(kgdb-amd64-6.8-71) bt
#0  breakpoint () at ./machine/cpufunc.h:64
#1  0xffffffff803d8b82 in kdb_enter (why=0xffffffff806ca339 "panic",
msg=0xffffffff806ca339 "panic") at ../../../../sys/kern/subr_kdb.c:365
#2  0xffffffff8039adf0 in panic (fmt=0xffffffff806c82d3 "mutex %s not
owned at %s:%d") at ../../../../sys/kern/kern_shutdown.c:950
#3  0xffffffff80386b2e in _mtx_assert (m=0xffffffff80c8ed40, what=20,
file=0xffffffff806c7d18 "../../../../sys/kern/kern_mutex.c", line=185)
at ../../../../sys/kern/kern_mutex.c:827
#4  0xffffffff8038528e in unlock_mtx (lock=0xffffffff80c8ed40) at
../../../../sys/kern/kern_mutex.c:185
#5  0xffffffff803b73e6 in softclock (arg=0xffffffff80c90f40) at
../../../../sys/kern/kern_timeout.c:461
#6  0xffffffff8036436c in intr_event_execute_handlers
(p=0xffffff000413a000, ie=0xffffff000414ad00) at
../../../../sys/kern/kern_intr.c:1244
#7  0xffffffff80364443 in ithread_execute_handlers
(p=0xffffff000413a000, ie=0xffffff000414ad00) at
../../../../sys/kern/kern_intr.c:1257
#8  0xffffffff8036469f in ithread_loop (arg=0xffffff00021e92e0) at
../../../../sys/kern/kern_intr.c:1342
#9  0xffffffff80361d06 in fork_exit (callout=0xffffffff80364590
<ithread_loop>, arg=0xffffff00021e92e0, frame=0xffffff80001e7c80) at
../../../../sys/kern/kern_fork.c:892
#10 <signal handler called>

(kgdb-amd64-6.8-71) f 5
#5  0xffffffff803b73e6 in softclock (arg=0xffffffff80c90f40) at
../../../../sys/kern/kern_timeout.c:461
461						class->lc_unlock(c_lock);
(kgdb-amd64-6.8-71) l
456						lastfunc = c_func;
457					}
458	#endif
459					CTR1(KTR_CALLOUT, "callout %p finished", c);
460					if ((c_flags & CALLOUT_RETURNUNLOCKED) == 0)
461						class->lc_unlock(c_lock);
462				skip:
463					CC_LOCK(cc);
464					/*
465					 * If the current callout is locally
(kgdb-amd64-6.8-71) i local
c_func = (void (*)(void *)) 0xffffffff8060d550 <atkbd_timeout>
c_flags = 7
sharedlock = 1
c_arg = (void *) 0xffffffff80f50740
class = (struct lock_class *) 0xffffffff807543c0
c_lock = (struct lock_object *) 0xffffffff80c8ed40
cc = (struct callout_cpu *) 0xffffffff80c90f40
c = (struct callout *) 0xffffff800010ccc0
bucket = (struct callout_tailq *) 0xffffff800012f450
curticks = 8811
steps = 0
depth = 2
mpcalls = 1
lockcalls = 0
gcalls = 1