linux-kernel - hci_usb strikes again (was Re: BUG kmalloc-2048: Poison overwritten)

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Message-ID: <20080602222142.GB18599@elf.ucw.cz>
Date:	Tue, 3 Jun 2008 00:21:42 +0200
From:	Pavel Machek <pavel@...e.cz>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
Cc:	Justin Mattock <justinmattock@...il.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>, marcel@...tmann.org,
	linux-bluetooth@...r.kernel.org
Subject: hci_usb strikes again (was Re: BUG kmalloc-2048: Poison
	overwritten)

On Mon 2008-06-02 01:25:25, Rafael J. Wysocki wrote:
> On Monday, 2 of June 2008, Justin Mattock wrote:
> > I received this after the second simultaneous suspend: (I will try and
> > see if this is re creatable or not)
> 
> Suspend to RAM or hibernation?

hci_usb... that beast is known to corrupt random data on suspend and
surprise removal.

> > [  232.270737] BUG: unable to handle kernel paging request at 6b6b6c6b
> > [  232.270743] IP: [<c013f96d>] module_put+0x12/0x2b
> > [  232.270750] *pde = 00000000
> > [  232.270753] Oops: 0002 [#1] SMP
> > [  232.270757] Modules linked in: hci_usb cpufreq_ondemand
> > cpufreq_performance cpufreq_powersave rfcomm hidp l2cap bluetooth fan
> > ipmi_watchdog ipmi_msghandler uinput wlan_tkip ieee80211_crypt_tkip
> > ieee80211_crypt arpt_mangle arptable_filter arp_tables
> > nf_conntrack_ipv4 nf_conntrack iptable_mangle iptable_filter ip_tables
> > x_tables intelfb i2c_i810 i2c_algo_bit coretemp eeprom acpi_cpufreq
> > fglrx(P) applesmc joydev uvcvideo appletouch wlan_scan_sta
> > ath_rate_sample firewire_ohci firewire_core snd_hda_intel ath_pci
> > snd_pcm wlan ohci1394 intel_agp evdev ath_hal(P) snd_timer ieee1394
> > pata_acpi thermal ehci_hcd uhci_hcd snd_page_alloc snd_hwdep agpgart
> > video button processor
> > [  232.270800]
> > [  232.270802] Pid: 2690, comm: btdelconn Tainted: P
> > (2.6.26-rc4-00033-g5463508 #4)

...and we get oops in bluetooth.

Use btusb, instead.

Actually, I guess we should mark hci_usb as broken. I don't see why we
should debug the same problem over and over again.
								Pavel

-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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