smbfs kernel panic

[Rumko]

Today at 3AM my machine panicked and automatically rebooted itself...

panic: assertion: td->td_proc in smbfs_inactive
panic messages:
---
panic: assertion: td->td_proc in smbfs_inactive



(kgdb) bt
#0  dumpsys () at /usr/src/sys/kern/kern_shutdown.c:507
#1  0xc01ef4d3 in boot (howto=256) at /usr/src/sys/kern/kern_shutdown.c:340
#2  0xc01ef988 in panic (fmt=0xc041dec4 "assertion: td->td_proc in %s") at /usr
/src/sys/kern/kern_shutdown.c:619
#3  0xc03bbd1c in smbfs_inactive (ap=0x0) at /usr/src/sys/vfs/smbfs/smbfs_node.
c:349
#4  0xc023f82c in vop_inactive (ops=0x0, vp=0x0, td=0x0) at /usr/src/sys/kern/v
fs_vopops.c:795
#5  0xc0235d58 in vrele (vp=0xcfa0fbf8) at /usr/src/sys/kern/vfs_lock.c:173
#6  0xc03bbcd7 in smbfs_reclaim (ap=0x0) at /usr/src/sys/vfs/smbfs/smbfs_node.c
:331
#7  0xc023f859 in vop_reclaim (ops=0x0, vp=0x0, td=0x0) at /usr/src/sys/kern/vf
s_vopops.c:810
#8  0xc0234b98 in vclean (vp=0xd0175328, flags=8, td=0xc80d4600) at /usr/src/sy
s/kern/vfs_subr.c:1118
#9  0xc0234d20 in vgone (vp=0xd0175328) at thread.h:79
#10 0xc0236d77 in vlrureclaim (mp=0xcd315fb8, data=0x0) at /usr/src/sys/kern/vf
s_mount.c:576
#11 0xc0237167 in mountlist_scan (callback=0xc0236bed <vlrureclaim>, data=0x0, 
how=1) at /usr/src/sys/kern/vfs_mount.c:773
#12 0xc0236ec4 in vnlru_proc () at /usr/src/sys/kern/vfs_mount.c:623
#13 0xc01e5e6b in kthread_create_stk (func=0, arg=0x0, tdp=0xff800000, stksize=
0, fmt=0x0)
    at /usr/src/sys/kern/kern_kthread.c:104
Previous frame inner to this frame (corrupt stack?)
(kgdb)