--- Comment #11 from Bernhard Froehlich <> ---
I have updated the kernel to a very recent 11-STABLE.

FreeBSD 11.1-STABLE #1 r325275: Wed Nov  1 13:08:01 CET 2017

panic: thread's sleep queue 0 is not empty

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Unread portion of the kernel message buffer:
panic: thread's sleep queue 0 is not empty
cpuid = 0
KDB: stack backtrace:
db_trace_self_wrapper() at db_trace_self_wrapper+0x2b/frame 0xfffffe0460ccb9d0
vpanic() at vpanic+0x186/frame 0xfffffe0460ccba50
kassert_panic() at kassert_panic+0x126/frame 0xfffffe0460ccbac0
sleepq_add() at sleepq_add+0x382/frame 0xfffffe0460ccbb10
_cv_wait() at _cv_wait+0x1a2/frame 0xfffffe0460ccbb70
usb_process() at usb_process+0x17b/frame 0xfffffe0460ccbbb0
fork_exit() at fork_exit+0x84/frame 0xfffffe0460ccbbf0
fork_trampoline() at fork_trampoline+0xe/frame 0xfffffe0460ccbbf0
--- trap 0, rip = 0, rsp = 0, rbp = 0 ---
Uptime: 1d18h0m42s
Dumping 953 out of 16239 MB:..2%..11%..21%..31%..41%..51%..61%..71%..81%..91%

#0  doadump (textdump=1) at pcpu.h:222
222     pcpu.h: No such file or directory.
        in pcpu.h
(kgdb) #0  doadump (textdump=1) at pcpu.h:222
#1  0xffffffff80a5d5d5 in kern_reboot (howto=260)
    at /usr/src/sys/kern/kern_shutdown.c:366
#2  0xffffffff80a5dbb0 in vpanic (fmt=<value optimized out>,
    ap=<value optimized out>) at /usr/src/sys/kern/kern_shutdown.c:759
#3  0xffffffff80a5d9e6 in kassert_panic (fmt=<value optimized out>)
    at /usr/src/sys/kern/kern_shutdown.c:649
#4  0xffffffff80aaca32 in sleepq_add (wchan=0xfffffe0000fc2e70,
    lock=0xfffffe0000fc3140, wmesg=0xffffffff8142963f "-",
    flags=<value optimized out>, queue=0)
    at /usr/src/sys/kern/subr_sleepqueue.c:332
#5  0xffffffff809fbb42 in _cv_wait (cvp=0xfffffe0000fc2e70,
    lock=0xfffffe0000fc3140) at /usr/src/sys/kern/kern_condvar.c:135
#6  0xffffffff808bc61b in usb_process (arg=0xfffffe0000fc2e60)
    at /usr/src/sys/dev/usb/usb_process.c:193
#7  0xffffffff80a1f944 in fork_exit (
    callout=0xffffffff808bc4a0 <usb_process>, arg=0xfffffe0000fc2e60,
    frame=0xfffffe0460ccbc00) at /usr/src/sys/kern/kern_fork.c:1044
#8  0xffffffff80ebcc5e in fork_trampoline ()
    at /usr/src/sys/amd64/amd64/exception.S:651
#9  0x0000000000000000 in ?? ()
Current language:  auto; currently minimal

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