The following reply was made to PR kern/181100; it has been noted by GNATS.

From: Julio Merino <ju...@meroh.net>
To: bug-follo...@freebsd.org, julio+host-mastodon-j...@meroh.net
Cc:  
Subject: Re: kern/181100: [bwi] Turning up bwi0 crashes / deadlocks the kernel
Date: Sun, 11 Aug 2013 12:40:56 -0400

 I rebuilt a kernel with WITNESS enabled and got the following
 stacktrace, which probably sheds some useful details.  Copying by hand
 so omitting addresses:
 
 Sleeping on "fwload" with the following non-sleepable locks held:
 exclusive sleep mutex bwi0 (network driver) r = 0 (0x...) locked @
 /usr/src/sys/modules/bwi/../../dev/bwi/if_bwi.c:1313
 KDB: stack backtrace:
 0x...: at .kdb_backgrace
 0x...: at ._witness_debugger
 0x...: at .witness_warn
 0x...: at ._sleep
 0x...: at .firmware_get
 0x...: at .bwi_mac_init
 0x...: at .bwi_init_statechg
 0x...: at .bwi_ioctl
 0x...: at .parent_updown
 0x...: at .taskqueue_run_locked
 0x...: at .taskqueue_thread_loop
 0x...: at .fork_exit
 0x...: at .fork_tramploline
 0x...: at fffffffffffffffc
 bwi0: firmware rev 0x0127, patch level 0x000e
 panic: rate 130 is basic/mcs?
 cpuid = 0
 KDB: stack backtrace:
 0x...: at .kdb_backtrace
 0x...: at .vpanic
 0x...: at .kassert_panic
 0x...: at .bwi_mac_set_ackrates
 0x...: at .bwi_mac_init
 0x...: at .bwi_init_statechg
 0x...: at .bwi_ioctl
 0x...: at .parent_updown
 0x...: at .taskqueue_run_locked
 0x...: at .taskqueue_thread_loop
 0x...: at .fork_exit
 0x...: at .fork_trampoline
 0x...: at fffffffffffffffc
 KDB: enter: panic
 [ thread pid 0 tid 100100 ]
 Stopped at 0x...
 
 -- 
 Julio Merino / @jmmv
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