It's 7.0-RELEASE amd64, GENERIC modulo some devices, using 4BSD, IPSEC, and IPFW. The backtrace seems related to softupdate code. This box is just a NFS server that serves ~25 6.x + Linux clients. Any ideas? Regards, Rong-En Fan panic: lockmgr: locking against myself cpuid = 1 KDB: stack backtrace: db_trace_self_wrapper() at db_trace_self_wrapper+0x2a panic() at panic+0x17a _lockmgr() at _lockmgr+0x85a getblk() at getblk+0x149 breadn() at breadn+0x3f bread() at bread+0x1e indir_trunc() at indir_trunc+0x11f indir_trunc() at indir_trunc+0x287 indir_trunc() at indir_trunc+0x287 handle_workitem_freeblocks() at handle_workitem_freeblocks+0x2aa process_worklist_item() at process_worklist_item+0x293 softdep_process_worklist() at softdep_process_worklist+0xed softdep_flush() at softdep_flush+0x12a fork_exit() at fork_exit+0x11f fork_trampoline() at fork_trampoline+0xe --- trap 0, rip = 0, rsp = 0xffffffffb91f1d30, rbp = 0 --- Uptime: 8d15h33m46s Physical memory: 3064 MB Dumping 470 MB: 455 439 423 407 391 375 359 343 327 311 295 279 263 247 231 215 199 183 167 151 135 119 103 87 71 55 39 23 7 #0 doadump () at pcpu.h:194 194 pcpu.h: No such file or directory. in pcpu.h #0 doadump () at pcpu.h:194 #1 0xffffffff802b1ad8 in boot (howto=260) at /usr/src/sys/kern/kern_shutdown.c:409 #2 0xffffffff802b1f37 in panic (fmt=Variable "fmt" is not available. ) at /usr/src/sys/kern/kern_shutdown.c:563 #3 0xffffffff802a258a in _lockmgr (lkp=0xffffffffa65f1c38, flags=0, interlkp=Variable "interlkp" is not available. ) at /usr/src/sys/kern/kern_lock.c:366 #4 0xffffffff80319dc9 in getblk (vp=0xffffff000151e7c0, blkno=21058528, size=16384, slpflag=0, slptimeo=0, flags=Variable "flags" is not available. ) at buf.h:301 #5 0xffffffff8031aa8f in breadn (vp=0xffffff000151e7c0, blkno=Variable "blkno" is not available. ) at /usr/src/sys/kern/vfs_bio.c:786 #6 0xffffffff8031abae in bread (vp=Variable "vp" is not available. ) at /usr/src/sys/kern/vfs_bio.c:734 #7 0xffffffff803e897f in indir_trunc (freeblks=0xffffff009c6db600, dbn=21058528, level=0, lbn=6303756, countp=0xffffffffb91f1b10) at /usr/src/sys/ufs/ffs/ffs_softdep.c:2866 #8 0xffffffff803e8ae7 in indir_trunc (freeblks=0xffffff009c6db600, dbn=Variable "dbn" is not available. ) at /usr/src/sys/ufs/ffs/ffs_softdep.c:2892 #9 0xffffffff803e8ae7 in indir_trunc (freeblks=0xffffff009c6db600, dbn=Variable "dbn" is not available. ) at /usr/src/sys/ufs/ffs/ffs_softdep.c:2892 #10 0xffffffff803e8f0a in handle_workitem_freeblocks ( freeblks=0xffffff009c6db600, flags=0) at /usr/src/sys/ufs/ffs/ffs_softdep.c:2746 #11 0xffffffff803ea473 in process_worklist_item (mp=0xffffff000159d978, flags=Variable "flags" is not available. ) at /usr/src/sys/ufs/ffs/ffs_softdep.c:963 #12 0xffffffff803eb4cd in softdep_process_worklist (mp=0xffffff000159d978, full=0) at /usr/src/sys/ufs/ffs/ffs_softdep.c:847 #13 0xffffffff803ed42a in softdep_flush () at /usr/src/sys/ufs/ffs/ffs_softdep.c:758 #14 0xffffffff802924bf in fork_exit ( callout=0xffffffff803ed300 <softdep_flush>, arg=0x0, frame=0xffffffffb91f1c80) at /usr/src/sys/kern/kern_fork.c:781 #15 0xffffffff8043170e in fork_trampoline () at /usr/src/sys/amd64/amd64/exception.S:415