Sleeping thread (tid 100033, pid 16): panic in FreeBSD 10.0-CURRENT/amd64 r228662

[O. Hartmann]

Since three days for now I get a panic when I shutdown or reboot my
FreeBSD 10.0-CURREN/amd64 box:

Sleeping thread (tid 100033, pid 16) owns a non sleepable lock
panic: sleeping thread
cpuid = 0

PID 16 is always USB on my box.

Any advice or tip to get rid of it?

Oliver

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