(kgdb) bt
#0  _get_mycpu (di=0xffffffff808aeea0) at ./machine/thread.h:73
#1  md_dumpsys (di=0xffffffff808aeea0) at /usr/src/sys/platform/pc64/x86_64/dump_machdep.c:262
#2  0xffffffff8035c4d6 in dumpsys () at /usr/src/sys/kern/kern_shutdown.c:880
#3  0xffffffff8035cb63 in boot (howto=-2004318071) at /usr/src/sys/kern/kern_shutdown.c:387
#4  0xffffffff8035cd76 in panic (fmt=0xffffffff806073b4 "from debugger") at /usr/src/sys/kern/kern_shutdown.c:786
#5  0xffffffff80190625 in db_panic (addr=<value optimized out>, have_addr=0, count=0, modif=0x0) at /usr/src/sys/ddb/db_command.c:448
#6  0xffffffff80190cdb in db_command () at /usr/src/sys/ddb/db_command.c:344
#7  db_command_loop () at /usr/src/sys/ddb/db_command.c:470
#8  0xffffffff80193a61 in db_trap (type=<value optimized out>, code=<value optimized out>) at /usr/src/sys/ddb/db_trap.c:71
#9  0xffffffff805da5fe in kdb_trap (type=3, code=0, regs=0xffffffe01b43c8f8) at /usr/src/sys/platform/pc64/x86_64/db_interface.c:176
#10 0xffffffff805dfbe2 in trap (frame=0xffffffe01b43c8f8) at /usr/src/sys/platform/pc64/x86_64/trap.c:705
#11 0xffffffff805d8d0e in calltrap () at /usr/src/sys/platform/pc64/x86_64/exception.S:179
#12 0xffffffff805da4d5 in breakpoint (msg=<value optimized out>) at ./cpu/cpufunc.h:73
#13 Debugger (msg=<value optimized out>) at /usr/src/sys/platform/pc64/x86_64/db_interface.c:359
#14 0xffffffff8035cd6f in panic (fmt=0xffffffff805fbf4a "assertion: %s in %s") at /usr/src/sys/kern/kern_shutdown.c:784
#15 0xffffffff8053280f in hammer_ip_delete_range (cursor=0xffffffe01b43cb40, ip=0xffffffe03eb2d978, ran_beg=0, ran_end=9223372036854775807, truncating=2) at /usr/src/sys/vfs/hammer/hammer_object.c:1973
#16 0xffffffff8052a3b2 in hammer_sync_inode (trans=0xffffffe01b420188, ip=0xffffffe03eb2d978) at /usr/src/sys/vfs/hammer/hammer_inode.c:2831
#17 0xffffffff80524f60 in hammer_flusher_flush_inode (arg=<value optimized out>) at /usr/src/sys/vfs/hammer/hammer_flusher.c:512
#18 hammer_flusher_slave_thread (arg=<value optimized out>) at /usr/src/sys/vfs/hammer/hammer_flusher.c:455
#19 0xffffffff80365e34 in lwkt_deschedule_self (td=0xffffffff8092af18) at /usr/src/sys/kern/lwkt_thread.c:281
Backtrace stopped: previous frame inner to this frame (corrupt stack?)