"panic: sleeping thread owns a mutex" in bremfree()

[Kris Kennaway]

I just got the following panic on alpha:

panic: sleeping thread owns a mutex

propagate_priority() at propagate_priority+0x148
_mtx_lock_sleep() at _mtx_lock_sleep+0x264
_mtx_lock_flags() at _mtx_lock_flags+0x84
bremfree() at bremfree+0x30
vfs_backgroundwritedone() at vfs_backgroundwritedone+0x1c8
bufdone() at bufdone+0x1c4
bufdonebio() at bufdonebio+0x1c
biodone() at biodone+0x90
g_dev_done() at g_dev_done+0xd8
biodone() at biodone+0x90
g_io_schedule_up() at g_io_schedule_up+0x128
g_up_procbody() at g_up_procbody+0x5c
fork_exit() at fork_exit+0x100
exception_return() at exception_return
--- root of call graph ---

As usual, no gdb backtrace possible because it's broken on alpha.

Kris
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