[Bug 193696] CAM AC_FOUND_DEVICE calls malloc(M_WAITOK) from THREAD_NO_SLEEPING() context

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=193696

--- Comment #6 from Bryan Drewery <bdrewery at FreeBSD.org> ---
Trace from xpt_done_td from pulling a device out of the system:

KASSERT failed: malloc(M_WAITOK) in no_sleeping context
KDB: stack backtrace:
db_trace_self_wrapper() at db_trace_self_wrapper+0x2b/frame 0xfffffe349829a340
kdb_backtrace() at kdb_backtrace+0x39/frame 0xfffffe349829a3f0
_kassert_panic() at _kassert_panic+0xd7/frame 0xfffffe349829a470
malloc() at malloc+0x2e4/frame 0xfffffe349829a4c0
g_post_event_x() at g_post_event_x+0x84/frame 0xfffffe349829a510
g_post_event() at g_post_event+0x5d/frame 0xfffffe349829a580
adacleanup() at adacleanup+0x62/frame 0xfffffe349829a5a0
cam_periph_release_locked_buses() at cam_periph_release_locked_buses+0xde/frame
0xfffffe349829aaa0
cam_periph_release_locked() at cam_periph_release_locked+0x1b/frame
0xfffffe349829aac0
adadone() at adadone+0x26e/frame 0xfffffe349829ab20
xpt_done_process() at xpt_done_process+0x3a4/frame 0xfffffe349829ab60
xpt_done_td() at xpt_done_td+0x136/frame 0xfffffe349829abb0
fork_exit() at fork_exit+0x84/frame 0xfffffe349829abf0
fork_trampoline() at fork_trampoline+0xe/frame 0xfffffe349829abf0

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