panic: lockmgr: locking against myself
cpuid = 0
KDB: enter: panic
exclusive sleep mutex Giant r = 0 (0xc0bb1250) locked @ /usr/src/sys/kern/kern_conf.c:326
panic: from debugger
cpuid = 0
Uptime: 9m5s
Physical memory: 1003 MB
Dumping 105 MB: 90 74 58 42 26 10

#0  doadump () at pcpu.h:195
195     pcpu.h: No such file or directory.
        in pcpu.h
(kgdb) bt
#0  doadump () at pcpu.h:195
#1  0xc074ec6e in boot (howto=260) at /usr/src/sys/kern/kern_shutdown.c:409
#2  0xc074ef2b in panic (fmt=Variable "fmt" is not available.
) at /usr/src/sys/kern/kern_shutdown.c:563
#3  0xc048c887 in db_panic (addr=Could not find the frame base for "db_panic".
) at /usr/src/sys/ddb/db_command.c:433
#4  0xc048d275 in db_command_loop () at /usr/src/sys/ddb/db_command.c:401
#5  0xc048e9e5 in db_trap (type=3, code=0) at /usr/src/sys/ddb/db_main.c:222
#6  0xc0775c76 in kdb_trap (type=3, code=0, tf=0xe6a236c8) at /usr/src/sys/kern/subr_kdb.c:502
#7  0xc0a02e6b in trap (frame=0xe6a236c8) at /usr/src/sys/i386/i386/trap.c:621
#8  0xc09e889b in calltrap () at /usr/src/sys/i386/i386/exception.s:139
#9  0xc0775df2 in kdb_enter (msg=0xc0a9bd83 "panic") at cpufunc.h:60
#10 0xc074ef14 in panic (fmt=0xc0a997b4 "lockmgr: locking against myself") at /usr/src/sys/kern/kern_shutdown.c:547
#11 0xc073ee97 in _lockmgr (lkp=0xc67f6058, flags=8194, interlkp=0xc67f60d4, td=0xc69a6000, file=0xc0aa7186 "/usr/src/sys/kern/vfs_subr.c", line=2130)
    at /usr/src/sys/kern/kern_lock.c:366
#12 0xc07bcb40 in vop_stdlock (ap=0xe6a23824) at /usr/src/sys/kern/vfs_default.c:266
#13 0xc0a19625 in VOP_LOCK1_APV (vop=0xc6972ba0, a=0xe6a23824) at vnode_if.c:1618
#14 0xc07d6a88 in _vn_lock (vp=0xc67f6000, flags=8194, td=0xc69a6000, file=0xc0aa7186 "/usr/src/sys/kern/vfs_subr.c", line=2130) at vnode_if.h:851
#15 0xc07cb09e in vrele (vp=0xc67f6000) at /usr/src/sys/kern/vfs_subr.c:2130
#16 0xc696e56e in ?? ()
#17 0xc67f6000 in ?? ()
#18 0xc69a6000 in ?? ()
#19 0xe6a238a8 in ?? ()
#20 0xc0a16475 in VOP_ISLOCKED_APV (vop=0xe6a23908, a=0x13) at vnode_if.c:49
#21 0xc0a17655 in VOP_CLOSE_APV (vop=0x1, a=0xc4d3cd00) at vnode_if.c:424
#22 0xc07ca857 in vgonel (vp=0xc67f6000) at vnode_if.h:228
#23 0xc07cb4f7 in vflush (mp=0xc42b02e8, rootrefs=0, flags=2, td=0xc69a6000) at /usr/src/sys/kern/vfs_subr.c:2380
#24 0xc696d2a6 in ?? ()
#25 0xc42b02e8 in ?? ()
#26 0x00000000 in ?? ()
#27 0x00000002 in ?? ()
#28 0xc69a6000 in ?? ()
#29 0x000000e9 in ?? ()
#30 0xc0b7fba0 in vop_lock1_desc ()
#31 0xc67f6000 in ?? ()
#32 0x00000000 in ?? ()
#33 0xc69a6000 in ?? ()
#34 0xc62bfd98 in ?? ()
#35 0x00000000 in ?? ()
#36 0xc69a6000 in ?? ()
#37 0xe6a23a6c in ?? ()
#38 0xc07c5ae6 in dounmount (mp=0xc42b02e8, flags=3, td=0xc42b02e8) at /usr/src/sys/kern/vfs_mount.c:1273
Previous frame identical to this frame (corrupt stack?)