tst (panic: lockmgr: pid -1, not exclusive lock holder thr 0xffffffe024568bf0/0xffffffe0245694f0 unlocking)

[Romick]

_get_mycpu () at ./machine/thread.h:69
69          __asm ("movq %%gs:globaldata,%0" : "=r" (gd) : "m"(__mycpu__dummy));
(kgdb) bt
#0  _get_mycpu () at ./machine/thread.h:69
#1  md_dumpsys (di=<optimized out>) at /home/rabbit/src/kernel/sys/platform/pc64/x86_64/dump_machdep.c:263
#2  0xffffffff80414075 in dumpsys () at /home/rabbit/src/kernel/sys/kern/kern_shutdown.c:927
#3  0xffffffff804146db in boot (howto=260) at /home/rabbit/src/kernel/sys/kern/kern_shutdown.c:389
#4  0xffffffff80414984 in panic (fmt=0xffffffff80768a30 "lockmgr: pid %d, not %s thr %p/%p unlocking") at /home/rabbit/src/kernel/sys/kern/kern_shutdown.c:833
#5  0xffffffff80405391 in lockmgr (lkp=0xffffffe008f950f0, flags=<optimized out>) at /home/rabbit/src/kernel/sys/kern/kern_lock.c:475
#6  0xffffffff8046c0a3 in BUF_UNLOCK (bp=<optimized out>) at /home/rabbit/src/kernel/sys/sys/buf2.h:111
#7  brelse (bp=0xffffffe008f94d58) at /home/rabbit/src/kernel/sys/kern/vfs_bio.c:1681
#8  0xffffffff8046e23f in bpdone (bp=0xffffffe008f94d58, elseit=<optimized out>) at /home/rabbit/src/kernel/sys/kern/vfs_bio.c:3851
#9  0xffffffff8046e81c in biodone (bio=0x0) at /home/rabbit/src/kernel/sys/kern/vfs_bio.c:4049
#10 0xffffffff80428de9 in request_polling_biodone (bp=0xffffffe008f94ec8) at /home/rabbit/src/kernel/sys/kern/kern_dsched.c:609
#11 0xffffffff8046e800 in biodone (bio=0xffffffe008f94ec8) at /home/rabbit/src/kernel/sys/kern/vfs_bio.c:4040
#12 0xffffffff81e1cb39 in vnstrategy (ap=<optimized out>) at /home/rabbit/src/kernel/sys/dev/disk/vn/vn.c:381
#13 0xffffffff803f5475 in dev_dstrategy (dev=0xffffffe02a955c70, bio=0xffffffe008f94ec8) at /home/rabbit/src/kernel/sys/kern/kern_device.c:349
#14 0xffffffff804284d2 in dsched_strategy_async (dp=0xffffffe0289add88, bio=0xffffffe008f94e40, done=0xffffffff80428d55 <request_polling_biodone>,
    priv=0xffffffe04dc98b10) at /home/rabbit/src/kernel/sys/kern/kern_dsched.c:580
#15 0xffffffff8042850e in dsched_strategy_request_polling (dp=<unavailable>, bio=<unavailable>, diskctx=<optimized out>)
    at /home/rabbit/src/kernel/sys/kern/kern_dsched.c:642
#16 0xffffffff806ac9fc in bfq_dequeue (diskctx=0xffffffe028a04800) at /home/rabbit/src/kernel/sys/kern/dsched/bfq/bfq.c:914
#17 0xffffffff806adcd5 in helper_msg_exec (msg=<optimized out>) at /home/rabbit/src/kernel/sys/kern/dsched/bfq/bfq_helper_thread.c:387
#18 0xffffffff806ae4a1 in helper_thread (bfq_diskctx=0xffffffe028a04800) at /home/rabbit/src/kernel/sys/kern/dsched/bfq/bfq_helper_thread.c:356
#19 0xffffffff8041f720 in lwkt_deschedule_self (td=<unavailable>) at /home/rabbit/src/kernel/sys/kern/lwkt_thread.c:283
Backtrace stopped: previous frame inner to this frame (corrupt stack?)

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