usb/144387: if_run panic

[Alexander Kuznetsov]

>Number:         144387
>Category:       usb
>Synopsis:       if_run panic
>Confidential:   no
>Severity:       non-critical
>Priority:       low
>Responsible:    freebsd-usb
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Mon Mar 01 12:00:06 UTC 2010
>Closed-Date:
>Last-Modified:
>Originator:     Alexander Kuznetsov
>Release:        9.0-CURRENT (both i386 and amd64)
>Organization:
>Environment:
>Description:
if_run causes kernel panic

run0: device timeout
panic: mutex run0 not owned at /usr/src/sys/modules/usb/run/../../../dev/usb/wlan/run/if_run.c:3376
cpuid = 0
KDB: enter: panic
[ thread pid 0 tid 100068 ]
Stopped at kdb_enter+0x3d: movq $0,0x6b5b30(%rip)
db>bt
Tracing pid 0 tid 100068 td 0xffffff000252d000
kdb_enter() at kdb_enter+0x3d
panic() at panic+0x17b
_mtx_assert() at _mtx_assert+0xdc
run_usb_timeout_cb() at run_usb_timeout_cb+0x35
taskqueue_run() at taskqueue_run+0x91
taskqueue_thread_loop() at taskqueue_thread_loop+0x3f
fork_exit() at fork_exit+0x12a
fork_trampoline() at fork_trampoline+0xe
--- trap 0, rip = 0, rsp = 0xffffff80001bcd30, rbp = 0 ---
db>
>How-To-Repeat:
# kldload if_run
# ifconfig wlan create wlandev run0 wlanmode hostap
# ifconfig wlan0 ssid test
# ifconfig wlan0 inet 192.168.0.10
[panic after some seconds]

>Fix:


>Release-Note:
>Audit-Trail:
>Unformatted: