linux-kernel - Re: PROBLEM: "BUG:" when resuming from suspend-to-ram

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Date:	Wed, 28 Feb 2007 01:27:21 +0100
From:	Kristian Grønfeldt Sørensen <kriller@....dk>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
Cc:	Linux kernel mailing list <linux-kernel@...r.kernel.org>,
	linux-acpi@...r.kernel.org
Subject: Re: PROBLEM: "BUG:" when resuming from suspend-to-ram

On Tue, 2007-02-27 at 23:30 +0100, Rafael J. Wysocki wrote:
> On Tuesday, 27 February 2007 23:04, Rafael J. Wysocki wrote:
> > Hi,
> > 
> > On Tuesday, 27 February 2007 19:45, Kristian Grønfeldt Sørensen wrote:
> > > Hi.
> > > 
> > > PROBLEM: "BUG:" when resumimg from suspend-to-ram 
> > > 	
> > > My laptop have a problem with resuming from suspend-to-ram. 
> > > It does not occur every time - most of the time, resume works without
> > > any problem.at all.
> > > 
> > > After it occurs, the laptop refuses to go into suspend-to-ram mode until
> > > next reboot.
> > 
> > What do you mean by "refuses"?  Are there any suspicious messages in
> > dmesg?
> > 
> > > The system is a Debian unstable running with a self-compiled 2.6.20
> > > kernel downloaded from kernel.org. 
> > > 
> > > I've only tried suspend-to-ram on 2.6.20 so I don't know whether or not
> > > other versions might have the same problem.
> > > 
> > > I'm not subscribed to the list. Please CC me.
> > 
> > I guess one of the drivers you use goes awry at some point.  Please provide
> > us with more information (like dmesg output after a failing resume).
> 
> I'm sorry, I've just been told you sent it. :-)
> 
> > CLASS: Unregistering class device. ID = 'event3'
> > class_uevent - name = event3
> > class_device_create_uevent called for event3
> > device class 'event3': release.
> > class_device_create_release called for event3
> > BUG: unable to handle kernel paging request at virtual address 6b6b6b6b
> >  printing eip:
> > f8825a81
> > *pde = 00000000
> > Oops: 0000 [#1]
> > PREEMPT
> > Modules linked in: tg3 battery ac thermal fan button i915 drm binfmt_misc
> > rfcomm l2cap ipv6 fuse capability commoncap cpufreq_performance aoe
> > af_packet nls_utf8 ntfs nls_iso8859_1 nls_cp437 vfat fat dm_snapshot
> > dm_mirror dm_mod ieee80211_cr ypt_tkip ieee80211_crypt pd6729 snd_seq_dummy
> > snd_seq_oss snd_seq_midi snd_rawmi di snd_seq_midi_event snd_seq
> > snd_seq_device sermouse hci_vhci hci_uart wbsd mmc _block mmc_core tun msr
> > cpuid cpufreq_stats container video speedstep_lib speeds tep_centrino
> > processor sr_mod sbp2 scsi_mod ide_cd cdrom eth1394 hci_usb bluetoo th
> > pcmcia firmware_class irda snd_intel8x0m snd_intel8x0 snd_ac97_codec
> > crc_ccit t ac97_bus snd_pcm_oss snd_mixer_oss rtc i2c_i801 snd_pcm
> > snd_timer ohci1394 iee e1394 i2c_core serio_raw intel_agp iTCO_wdt snd
> > soundcore snd_page_alloc ehci_hc d pcspkr uhci_hcd yenta_socket
> > rsrc_nonstatic pcmcia_core usbcore agpgart moused ev evdev
> > CPU:    0
> > EIP:    0060:[<f8825a81>]    Not tainted VLI
> > EFLAGS: 00010202   (2.6.20-x300 #1)
> > EIP is at evdev_disconnect+0xb1/0xe0 [evdev]
> 
> This points us to a suspect.  Can you please run "gdb vmlinux" against the
> vmlinux in your kernel sources directory and then
> 
> gdb> l *evdev_disconnect+0xb1

OK. Recopiled the kernel with CONFIG_DEBUG_INFO=y

This gives: 

(gdb) l *evdev_disconnect+0xb1
No symbol "evdev_disconnect" in current context.

I guess you meant gdb drivers/input/evdev.ko

This gives:

(gdb) l *evdev_disconnect+0xb1
0xa81 is in evdev_disconnect (include/asm/processor.h:716).
711        However we don't do prefetches for pre XP Athlons currently
712        That should be fixed. */
713     #define ARCH_HAS_PREFETCH
714     static inline void prefetch(const void *x)
715     {
716             alternative_input(ASM_NOP4,
717                               "prefetchnta (%1)",
718                               X86_FEATURE_XMM,
719                               "r" (x));
720     }

/Kristian
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