linux-kernel - BUG: bad unlock balance detected iwl3945/1438 is trying to release lock

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Date:	Thu, 24 Apr 2008 01:00:34 +0200
From:	"Zdenek Kabelac" <zdenek.kabelac@...il.com>
To:	"Linux Kernel Mailing List" <linux-kernel@...r.kernel.org>
Subject: BUG: bad unlock balance detected iwl3945/1438 is trying to release lock

Hello

This stacktrace is with git
8876b8ed5fc9e996918cac4a553b8bc40d5605d7
(compiled few minutes ago)

(Unsure how it's related to other bugs around iwl driver)

Happens when wifi network is enabled/disabled

Zdenek


 ACPI: PCI interrupt for device 0000:03:00.0 disabled
 ACPI: PCI Interrupt 0000:03:00.0[A] -> GSI 17 (level, low) -> IRQ 17
 PM: Writing back config space on device 0000:03:00.0 at offset 1 (was
100102, writing 100106)

 =====================================
 [ BUG: bad unlock balance detected! ]
 -------------------------------------
 iwl3945/1438 is trying to release lock (&priv->mutex) at:
 [<ffffffff812ed439>] mutex_unlock+0x9/0x10
 but there are no more locks to release!

 other info that might help us debug this:
 2 locks held by iwl3945/1438:
  #0:  ((name)){--..}, at: [<ffffffff8105107a>] run_workqueue+0xaa/0x230
  #1:  (&ifsta->work){--..}, at: [<ffffffff8105107a>] run_workqueue+0xaa/0x230

 stack backtrace:
 Pid: 1438, comm: iwl3945 Not tainted 2.6.25 #61

 Call Trace:
  [<ffffffff810669d5>] print_unlock_inbalance_bug+0x105/0x130
  [<ffffffff81013458>] ? native_sched_clock+0x78/0x80
  [<ffffffff81065434>] ? __lock_acquire+0x364/0x11d0
  [<ffffffff81065434>] ? __lock_acquire+0x364/0x11d0
  [<ffffffff81066b18>] lock_release_non_nested+0x118/0x1a0
  [<ffffffff812ed439>] ? mutex_unlock+0x9/0x10
  [<ffffffff81066c66>] lock_release+0xc6/0x230
  [<ffffffff812ed336>] __mutex_unlock_slowpath+0x86/0x180
  [<ffffffff812ed439>] mutex_unlock+0x9/0x10
  [<ffffffffa0189d34>] :iwl3945:iwl3945_mac_config_interface+0x44/0x420
  [<ffffffff81062aca>] ? get_lock_stats+0x2a/0x70
  [<ffffffffa014ac46>] :mac80211:__ieee80211_if_config+0x86/0xe0
  [<ffffffffa014b67a>] :mac80211:ieee80211_if_config+0x3a/0x70
  [<ffffffffa0151f52>] :mac80211:ieee80211_sta_set_bssid+0xb2/0xd0
  [<ffffffffa01577be>] :mac80211:ieee80211_sta_work+0x158e/0x19b0
  [<ffffffff81062aca>] ? get_lock_stats+0x2a/0x70
  [<ffffffff81062aca>] ? get_lock_stats+0x2a/0x70
  [<ffffffff81062b1e>] ? put_lock_stats+0xe/0x30
  [<ffffffff81059311>] ? hrtimer_start+0xe1/0x1a0
  [<ffffffff81013458>] ? native_sched_clock+0x78/0x80
  [<ffffffff81065434>] ? __lock_acquire+0x364/0x11d0
  [<ffffffff81062b1e>] ? put_lock_stats+0xe/0x30
  [<ffffffff8105107a>] ? run_workqueue+0xaa/0x230
  [<ffffffff8105107a>] ? run_workqueue+0xaa/0x230
  [<ffffffffa0156230>] ? :mac80211:ieee80211_sta_work+0x0/0x19b0
  [<ffffffff810510c6>] run_workqueue+0xf6/0x230
  [<ffffffff810512a7>] worker_thread+0xa7/0x120
  [<ffffffff81055810>] ? autoremove_wake_function+0x0/0x40
  [<ffffffff81051200>] ? worker_thread+0x0/0x120
  [<ffffffff81055479>] kthread+0x49/0x90
  [<ffffffff8100d548>] child_rip+0xa/0x12
  [<ffffffff8100cc33>] ? restore_args+0x0/0x30
  [<ffffffff81055430>] ? kthread+0x0/0x90
  [<ffffffff8100d53e>] ? child_rip+0x0/0x12
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