Kernel Panic

[karthik holla]

Hi,
I have had a random kernel panic which I am not able to reproduce while
unloading snd_hda.ko. Here is the backtrace

#0  _get_mycpu () at ./machine/thread.h:69
#1  panic (fmt=fmt at entry=0xffffffff80d18328 "%s called with uninitialized
or corrupt sbuf") at /usr/src/sys/kern/kern_shutdown.c:868
#2  0xffffffff806a6d92 in _assert_sbuf_integrity
(fun=fun at entry=0xffffffff80d18678
<__func__.5808> "sbuf_delete",
    s=s at entry=0xffffffff81f28100 <sndstat_sbuf>) at
/usr/src/sys/kern/subr_sbuf.c:100
#3  0xffffffff806a7aab in sbuf_delete (s=0xffffffff81f28100 <sndstat_sbuf>)
at /usr/src/sys/kern/subr_sbuf.c:756
#4  0xffffffff81f044bc in sndstat_uninit () at
/usr/src/sys/dev/sound/sound/../pcm/sndstat.c:453
#5  sndstat_sysuninit (p=<optimized out>) at
/usr/src/sys/dev/sound/sound/../pcm/sndstat.c:471
#6  0xffffffff80625e9a in linker_file_sysuninit (lf=0xfffff800cf121080) at
/usr/src/sys/kern/kern_linker.c:230
#7  linker_file_unload (file=0xfffff800cf121080) at
/usr/src/sys/kern/kern_linker.c:535
#8  linker_file_unload (file=0xfffff800cf121080) at
/usr/src/sys/kern/kern_linker.c:477
#9  0xffffffff80625c3e in linker_file_unload (file=0xfffff800cf120fe0) at
/usr/src/sys/kern/kern_linker.c:545
#10 linker_file_unload (file=0xfffff800cf120fe0) at
/usr/src/sys/kern/kern_linker.c:477
#11 0xffffffff80626ea1 in sys_kldunload (sysmsg=<optimized out>,
uap=<optimized out>) at /usr/src/sys/kern/kern_linker.c:854
#12 0xffffffff80bec6be in syscall2 (frame=0xfffff801fbe439f8) at
/usr/src/sys/platform/pc64/x86_64/trap.c:1285
#13 0xffffffff80baf77d in Xfast_syscall () at
/usr/src/sys/platform/pc64/x86_64/exception.S:448
#14 0x000000000000002b in ?? ()
Backtrace stopped: previous frame inner to this frame (corrupt stack?)

Thanks
Karthik
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