kern/136943: [lor] wpi0_com_lock / wpi0

[Rene Ladan]

>Number:         136943
>Category:       kern
>Synopsis:       [lor] wpi0_com_lock / wpi0
>Confidential:   no
>Severity:       non-critical
>Priority:       low
>Responsible:    freebsd-bugs
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Mon Jul 20 21:20:04 UTC 2009
>Closed-Date:
>Last-Modified:
>Originator:     Rene Ladan
>Release:        8.0-BETA2 amd64
>Organization:
>Environment:
FreeBSD self.rene-ladan.nl 8.0-BETA2 FreeBSD 8.0-BETA2 #0: Wed Jul 15 21:48:41 UTC 2009     root at mason.cse.buffalo.edu:/usr/obj/usr/src/sys/GENERIC  amd64

>Description:
lock order reversal:
 1st 0xffffff80002dc018 wpi0_com_lock (wpi0_com_lock) @ /usr/src/sys/modules/wpi/../../dev/wpi/if_wpi.c:1291
 2nd 0xffffff00024c0010 wpi0 (network driver) @ /usr/src/sys/modules/wpi/../../dev/wpi/if_wpi.c:2068
KDB: stack backtrace:
db_trace_self_wrapper() at db_trace_self_wrapper+0x2a
_witness_debugger() at _witness_debugger+0x2e
witness_checkorder() at witness_checkorder+0x81e
_mtx_lock_flags() at _mtx_lock_flags+0x78
wpi_raw_xmit() at wpi_raw_xmit+0x7a
ieee80211_send_mgmt() at ieee80211_send_mgmt+0x4d5
sta_newstate() at sta_newstate+0x42e
wpi_newstate() at wpi_newstate+0xee
ieee80211_newstate_cb() at ieee80211_newstate_cb+0xac
taskqueue_run() at taskqueue_run+0x96
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 = 0xffffff803c22bd30, rbp = 0 ---
>How-To-Repeat:
GENERIC + if_wpi + wpifw ( + other modules)
wlan0 with WPA2 authentication

>Fix:


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