kern/136943: [lor] wpi0_com_lock / wpi0

Rene Ladan rene at
Mon Jul 20 22:00:18 UTC 2009

The following reply was made to PR kern/136943; it has been noted by GNATS.

From: Rene Ladan <rene at>
To: bug-followup at
Cc: bzeeb+freebsd+lor at
Subject: Re: kern/136943: [lor] wpi0_com_lock / wpi0
Date: Mon, 20 Jul 2009 23:31:57 +0200

 The same LOR with a different backtrace:
 lock order reversal:
  1st 0xffffff80002dc018 wpi0_com_lock (wpi0_com_lock) @
  2nd 0xffffff00024c0010 wpi0 (network driver) @
 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 ---

More information about the freebsd-bugs mailing list