[Bug 254227] disk_allo() malloc(M_WAITOK) with sleeping prohibited

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=254227

--- Comment #2 from Aiden Leong <aiden.leong at aibsd.com> ---
OCR result:
uhub0: 6 ports with 6 removable, self powered 
uhub2: 6 ports with 6 removable, self powered 
uhubl: 6 ports with 6 removable, self powered 
ugen1.2: <SMI Corporation USB DISK> at usbusl 
umass0 on uhub0 
umass0: <SMI Corporation USB DISK, class 0/0, rev 2.00/11.00, addr 1> on usbusl
umass0: SCSI over Bulk-Only; quirks = 6x4000 
umass0:2:0: Attached to scbus2 ugen2.2: <Realtek Bluetooth Radio> at usbus2 
panic: malloc(M_WAITOK) with sleeping prohibited 
cpuid = 14 
time = 2 
KDB: stack backtrace: 
db_trace_self_wrapper() at db_trace_self_wrapper+0x2b/frame 0xfffffe000188470 
vpanic() at vpanic+0x181/frame 0xfffffe0Bd71884c0 panic() at 
panic+0x43/frame 6xfffffe000188520 
malloc_dbg() at malloc_dbg+Oxd4/frame 0xfffffe000188540 
malloc() at malloc+0x34/frame 0xfffffe00d71885a0 
disk_alloc() at disk_alloc+Oxlc/frame 0xfffffe0001885c0 
daregister() at daregister+6x3f4/frame 0xfffffe000188840 
cam_periph_alloc() at cam_periph_alloc+0x57b/frame 0xfffffe00d7188910 
daasync() at daasync+0x2c2/frame 0xfffffe90d7188980 
xpt_async_process_dev() at xpt_async_process_dev+0x152/frame 0xfffffe0001889d0 
xpt_async_process() at xpt_async_process+0x334/frame 9xfffffe00d7188aa 
xpt_done_process() at xpt_done_process+0x3a3/frame 0xfffffe000188b20 
xpt_done_td() at xpt_done_td+Oxf5/frame 0xfffffe000188b70 
fork_exit() at fork_exit+Ox80/frame 6xfffffe000188bb0 
fork_trampoline() at fork_trampoline+Oxe/frame 6xfffffe000188bb0 
--- trap 0, rip = 0, rsp = 0, rbp = 0 ---
KDB: enter: panic 
[ thread pid 25 tid 100167 ] 
Stopped at kdb_enter+0x37: movq $0,0x128bbde(%rip) 
db> 1

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