[Bug 244975] Panic: deadlres_td_sleep_q: possible deadlock detected

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=244975

--- Comment #1 from Gordon Bergling <gbergling at gmail.com> ---
I had a similar kernel panic today with the following backtrace:

__curthread () at /boiler/nfs/src/sys/amd64/include/pcpu_aux.h:55
55              __asm("movq %%gs:%P1,%0" : "=r" (td) : "n" (offsetof(struct
pcpu,
(kgdb) #0  __curthread () at /boiler/nfs/src/sys/amd64/include/pcpu_aux.h:55
#1  doadump (textdump=0) at /boiler/nfs/src/sys/kern/kern_shutdown.c:394
#2  0xffffffff8049b43a in db_dump (dummy=<optimized out>,
    dummy2=<unavailable>, dummy3=<unavailable>, dummy4=<unavailable>)
    at /boiler/nfs/src/sys/ddb/db_command.c:575
#3  0xffffffff8049b1fc in db_command (last_cmdp=<optimized out>,
    cmd_table=<optimized out>, dopager=1)
    at /boiler/nfs/src/sys/ddb/db_command.c:482
#4  0xffffffff8049af6d in db_command_loop ()
    at /boiler/nfs/src/sys/ddb/db_command.c:535
#5  0xffffffff8049e168 in db_trap (type=<optimized out>, code=<optimized out>)
    at /boiler/nfs/src/sys/ddb/db_main.c:253
#6  0xffffffff80c07e24 in kdb_trap (type=3, code=0, tf=<optimized out>)
    at /boiler/nfs/src/sys/kern/subr_kdb.c:699
#7  0xffffffff8105cc68 in trap (frame=0xfffffe0001c968f0)
    at /boiler/nfs/src/sys/amd64/amd64/trap.c:578
#8  <signal handler called>
#9  kdb_enter (why=0xffffffff811ec7d7 "panic", msg=<optimized out>)
    at /boiler/nfs/src/sys/kern/subr_kdb.c:486
#10 0xffffffff80bbd8fe in vpanic (fmt=<optimized out>, ap=<optimized out>)
    at /boiler/nfs/src/sys/kern/kern_shutdown.c:902
#11 0xffffffff80bbd693 in panic (
    fmt=0xffffffff81c8db28 <cnputs_mtx> "\363\a\033\201\377\377\377\377")
    at /boiler/nfs/src/sys/kern/kern_shutdown.c:839
#12 0xffffffff80b54cfd in deadlres_td_sleep_q (p=0xfffff800033a7528,
    td=0xfffffe0001effa00, slpticks=180000)
    at /boiler/nfs/src/sys/kern/kern_clock.c:243
#13 deadlkres () at /boiler/nfs/src/sys/kern/kern_clock.c:288
#14 0xffffffff80b7b490 in fork_exit (callout=0xffffffff80b54970 <deadlkres>,
    arg=0x0, frame=0xfffffe0001c96b00)
    at /boiler/nfs/src/sys/kern/kern_fork.c:1051
#15 <signal handler called>

A core dump is also available.

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