Kernel BUG caused by iwlwifi

[Richard Hughes]

On Wed, 2007-03-21 at 16:49 -0400, John W. Linville wrote:
> On Mon, Mar 19, 2007 at 09:12:07AM +0000, Richard Hughes wrote:
> > Not sure what to do here - normally I wouldn't dare report
> > out-of-vanilla modules for BUG'ing, but this one is being included in
> > rawhide and stops the boot process dead.
> > 
> > Worth filing a RH bugzilla or a kernel bugzilla? This is with latest
> > rawhide.
> > 
> > Thanks,
> > 
> > Richard.
> > 
> > Mar 19 08:53:15 localhost kernel: BUG: workqueue leaked lock or atomic:
> > iwlwifi/0/0x00000000/1230
> > Mar 19 08:53:15 localhost kernel:     last function:
> > ipw_bg_reg_txpower_periodic+0x0/0x33 [iwlwifi]
> > Mar 19 08:53:15 localhost kernel: 2 locks held by iwlwifi/0/1230:
> > Mar 19 08:53:15 localhost kernel:  #0:  (rtnl_mutex){--..}, at:
> > [<c061408a>] mutex_lock+0x21/0x24
> > Mar 19 08:53:15 localhost kernel:  #1:  (&sysfs_inode_imutex_key){--..},
> > at: [<c061408a>] mutex_lock+0x21/0x24
> > Mar 19 08:53:15 localhost kernel:  [<c04061ed>] show_trace_log_lvl
> > +0x1a/0x2f
> > Mar 19 08:53:15 localhost kernel:  [<c04067b1>] show_trace+0x12/0x14
> > Mar 19 08:53:15 localhost kernel:  [<c0406835>] dump_stack+0x16/0x18
> > Mar 19 08:53:15 localhost kernel:  [<c04351c8>] run_workqueue+0xfe/0x145
> > Mar 19 08:53:15 localhost kernel:  [<c0435b6f>] worker_thread+0xf8/0x124
> > Mar 19 08:53:15 localhost kernel:  [<c0438353>] kthread+0xb3/0xdc
> > Mar 19 08:53:15 localhost kernel:  [<c0405cd7>] kernel_thread_helper
> > +0x7/0x10
> > Mar 19 08:53:15 localhost kernel:  =======================
> 
> >From the iwlwifi guys:
> 
> "If the submitter can load the module with the debug=0x43fff module
> parameter it would capture some trace information in the log that might help
> shed light on where the lock might be being obtained before the delayed work
> item fires."

Will do, I'll try and reproduce tonight.

> Give that a try and post the results?
> 
> FWIW, go ahead and open a bugzilla with me CC'ed.

Already done (different OOPS tho),
https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=233364

Thanks for your help with this.

Richard.