(kgdb) bt
#0  doadump (textdump=0) at /root/ws/head/sys/kern/kern_shutdown.c:298
#1  0xffffffff803f8692 in db_dump (dummy=-2100833195, dummy2=false, dummy3=-1, dummy4=0xfffffe08604c6810 "") at /root/ws/head/sys/ddb/db_command.c:533
#2  0xffffffff803f847e in db_command (last_cmdp=0xffffffff821d40d8 <db_last_command>, cmd_table=0x0, dopager=1) at /root/ws/head/sys/ddb/db_command.c:440
#3  0xffffffff803f801e in db_command_loop () at /root/ws/head/sys/ddb/db_command.c:493
#4  0xffffffff803fcf13 in db_trap (type=12, code=0) at /root/ws/head/sys/ddb/db_main.c:251
#5  0xffffffff8100116f in kdb_trap (type=12, code=0, tf=0xfffffe08604c6fe0) at /root/ws/head/sys/kern/subr_kdb.c:654
#6  0xffffffff8163df24 in trap_fatal (frame=0xfffffe08604c6fe0, eva=18446744069414584336) at /root/ws/head/sys/amd64/amd64/trap.c:836
#7  0xffffffff8163e53b in trap_pfault (frame=0xfffffe08604c6fe0, usermode=0) at /root/ws/head/sys/amd64/amd64/trap.c:763
#8  0xffffffff8163d1e2 in trap (frame=0xfffffe08604c6fe0) at /root/ws/head/sys/amd64/amd64/trap.c:442
#9  0xffffffff8163e63a in trap_check (frame=0xfffffe08604c6fe0) at /root/ws/head/sys/amd64/amd64/trap.c:635
#10 <signal handler called>
#11 0xffffffff82c7d455 in zfs_rename (sdvp=0xfffff80016e331d8, svpp=0xfffffe08604c7318, scnp=0xfffffe08604c7750, tdvp=0xfffff80156440000, tvpp=0xfffffe08604c7308, tcnp=0xfffffe08604c7688, cr=0xfffff8001612e600)
    at /root/ws/head/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/zfs_vnops.c:3959
#12 0xffffffff82c6f6a9 in zfs_freebsd_rename (ap=0xfffffe08604c73c8) at /root/ws/head/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/zfs_vnops.c:5275
#13 0xffffffff8187d484 in VOP_RENAME_APV (vop=0xffffffff82d19bb0 <zfs_vnodeops>, a=0xfffffe08604c73c8) at vnode_if.c:1547
#14 0xffffffff810e5d41 in VOP_RENAME (fdvp=0xfffff80016e331d8, fvp=0xfffff80174c02588, fcnp=0xfffffe08604c7750, tdvp=0xfffff80156440000, tvp=0xfffff8017d7d1ce8, tcnp=0xfffffe08604c7688) at ./vnode_if.h:636
#15 0xffffffff810e5b17 in kern_renameat (td=0xfffff8010b855a40, oldfd=-100, old=0x800a121a0 <error: Cannot access memory at address 0x800a121a0>, newfd=-100, new=0x7fffffffcfee <error: Cannot access memory at address 0x7fffffffcfee>, 
    pathseg=UIO_USERSPACE) at /root/ws/head/sys/kern/vfs_syscalls.c:3553
#16 0xffffffff810e53d7 in sys_rename (td=0xfffff8010b855a40, uap=0xfffffe08604c7a58) at /root/ws/head/sys/kern/vfs_syscalls.c:3427
#17 0xffffffff83ce244d in filemon_wrapper_rename (td=0xfffff8010b855a40, uap=0xfffffe08604c7a58) at /root/ws/head/sys/modules/filemon/../../dev/filemon/filemon_wrapper.c:240
#18 0xffffffff8163f1a9 in syscallenter (td=0xfffff8010b855a40, sa=0xfffffe08604c7a48) at /root/ws/head/sys/amd64/amd64/../../kern/subr_syscall.c:135
#19 0xffffffff8163e9ea in amd64_syscall (td=0xfffff8010b855a40, traced=0) at /root/ws/head/sys/amd64/amd64/trap.c:942