lists  /  announce  owl-users  owl-dev  john-users  john-dev  passwdqc-users  yescrypt  popa3d-users  /  oss-security  kernel-hardening  musl  sabotage  tlsify  passwords  /  crypt-dev  xvendor  /  Bugtraq  Full-Disclosure  linux-kernel  linux-netdev  linux-ext4  linux-hardening  PHC 
Open Source and information security mailing list archives
Hash Suite: Windows password security audit tool. GUI, reports in PDF.
[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Date:	Wed, 11 Nov 2009 21:20:28 +0100
From:	Marcel Holtmann <>
To:	Linus Torvalds <>
Cc:	"Rafael J. Wysocki" <>, Oleg Nesterov <>,
	Thomas Gleixner <>,
	Mike Galbraith <>, Ingo Molnar <>,
	LKML <>,
	pm list <>,
	Greg KH <>,
	Jesse Barnes <>,
	Tejun Heo <>,
Subject: Re: GPF in run_workqueue()/list_del_init(cwq-> on
 resume (was: Re: Help needed: Resume problems in 2.6.32-rc, perhaps related
 to preempt_count leakage in keventd)

Hi Linus,

> > I applied the patch and this is the result of 'dmesg | grep ERR' after 10-or-so
> > consecutive suspend-resume and hibernate-resume cycles:
> > 
> > [  129.008689] ERR!! btusb_waker+0x0/0x27 [btusb]
> > [  166.477373] ERR!! btusb_waker+0x0/0x27 [btusb]
> > [  203.983665] ERR!! btusb_waker+0x0/0x27 [btusb]
> > [  241.636547] ERR!! btusb_waker+0x0/0x27 [btusb]
> > 
> > which kind of confirms my previous observation that the problem was not
> > reproducible without Bluetooth.
> .. and that btusb thing matches my observation that only a few BT drivers 
> seem to use workqueues, and btusb_disconnect() isn't doing any work 
> cancel.
> > I'm going to test the appended patch, then.
> Hmm. the USB disconnect doesn't call hci_dev_put(), it calls 
> hci_free_dev() and doesn't seem to call the ->destruct thing. 
> Although again, maybe that gets called indirectly.
> So I'd put the cancel work in the actual disconnect routine. But maybe 
> thar's just me.

see my other email, I think we have to cancel the waker in btusb_close()
to fix this. However the suspend/resume and auto-suspend has been done
mostly by Oliver and I like to see what he thinks about this.



To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to
More majordomo info at
Please read the FAQ at

Powered by blists - more mailing lists