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Posted: Dec 12, 10, 1:28 anticapitalista
 Status: Contributor
Joined: 13 Jun 2008
Posts: 202
Location: Greece
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2.6.36-2.dmz.2 installed, but problem persists, I'm afraid to report.
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Posted: Dec 12, 10, 1:36 damentz
 Status: Assistant
Joined: 09 Sep 2008
Posts: 1143
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Hmm, well I suppose I'll have to get rid of autogrouping. If I keep it and remove patches up to before you guys first started experiencing the bug, I'll reintroduce a deadlock that someone else reported.

Looks like autogrouping wasn't ready for 2.6.36.

One last can try though. I'm running pulseaudio and that may be papering over the problem. Can you see what happens if you use pulseaudio for audio playback while using flash?
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Posted: Dec 12, 10, 4:34 Henrik
 Status: Interested
Joined: 06 Oct 2009
Posts: 14
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Tried with the new kernel and the problem is still there.

Installed pulseaudio and played a movie with vlc and kmplayer both using pulse as audio output. No oops...
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Posted: Dec 12, 10, 6:08 jollysnowman
 Status: Curious
Joined: 10 Dec 2010
Posts: 5
Location: Austin, TX
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I'm not at that computer right now, but regarding the pulse workaround, I can say that I have alsa on all of my machines, so I'll give it a shot.

Thanks for the hard work!
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Posted: Dec 12, 10, 12:25 nilssn
 Status: Curious
Joined: 12 Dec 2010
Posts: 6
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I just want to add that I have the same problem. I usually get the crash in connection with sound events from Empathy.
I use Debian Sid without Pulse Audio.
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Posted: Dec 13, 10, 17:31 damentz
 Status: Assistant
Joined: 09 Sep 2008
Posts: 1143
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Next kernel version won't have sched_autogroup. I'll wait for 2.6.37 to reintroduce the patch since it's an integral patch for -tip maintenance tree by Ingo Molnar.

This means that there will be more world wide testing to CFS to really odd bugs like the ones reported in this thread. Unfortunately, how long it will take for this bug to be found is not too predictable. The major distributions like Ubuntu, OpenSuse, and Fedora, all run pulseaudio... again papering over this problem, further prolonging this bug's fix.

This is also a very difficult bug to debug on the LKML since liquorix drives on the idea of mmotm for the stable kernel releases. Basically, find patches that fix bugs and problems that users are having trouble with now that will take almost a year to appear in a distribution that tries moderately to stay close to Linux upstream.

Sorry for time it's taking to solve this issue. I've been thinking about the different ways to go around fixing it but in the end we're going to lose sched_autogroup. Unless someone here is a kernel developer that understand how CFS works and can read / write C very well, I'm doubtful that this will get fixed in the Zen-Kernel sources before people move on to something else.
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Posted: Dec 13, 10, 22:52 damentz
 Status: Assistant
Joined: 09 Sep 2008
Posts: 1143
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2.6.36-2.dmz.4 is out without autogrouping. Had to rebase Zen too in order to completely clean out any bad conflict resolvations so this one should be rock solid (I've been running it while compiling, watching youtube vids, and playing Starcraft 2 of all things).

Let me know if something's still broken.
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Posted: Dec 14, 10, 6:59 jollysnowman
 Status: Curious
Joined: 10 Dec 2010
Posts: 5
Location: Austin, TX
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Is there a way we can file a bug report, or at least point someone important to this thread?
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Posted: Dec 14, 10, 8:44 nilssn
 Status: Curious
Joined: 12 Dec 2010
Posts: 6
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Hmmm... I still get the oops in this build. Back to 2.6.35-8.dmz.1-liquorix-686 for me.
Maybe my problem is different. I think this is the relevant part of my syslog:
:: Code ::
Dec 14 09:19:05 Tramp kernel: BUG: unable to handle kernel paging request at ffffffff
Dec 14 09:19:05 Tramp kernel: IP: [<c187ac62>] 0xc187ac62
Dec 14 09:19:05 Tramp kernel: *pde = 0077b067 *pte = 00000000
Dec 14 09:19:05 Tramp kernel: Oops: 0002 [#1] PREEMPT SMP
Dec 14 09:19:05 Tramp kernel: last sysfs file: /sys/devices/virtual/hwmon/hwmon0/temp1_input
Dec 14 09:19:05 Tramp kernel: Modules linked in: vboxnetadp vboxnetflt acpi_cpufreq mperf cpufreq_userspace cpufreq_ondemand cpufreq_conservative cpufreq_powersave cpufreq_stats freq_table parport_pc ppdev lp parport sco rfcomm bnep l2cap bluetooth ipv6 uinput binfmt_misc fuse nfsd exportfs vboxdrv nfs lockd fscache nfs_acl auth_rpcgss sunrpc loop i915 drm_kms_helper drm snd_hda_codec_idt snd_hda_intel snd_hda_codec snd_hwdep snd_pcm_oss snd_mixer_oss intel_agp joydev snd_pcm arc4 ecb agpgart ac snd_seq_dummy snd_seq_oss iwl3945 snd_seq_midi iwlcore snd_rawmidi snd_seq_midi_event mac80211 snd_seq cfg80211 rfkill snd_timer snd_seq_device shpchp snd i2c_i801 i2c_algo_bit pci_hotplug video psmouse tpm_tis tpm tpm_bios soundcore rtc_cmos rtc_core rtc_lib uvcvideo videodev v4l1_compat processor i2c_core wmi led_class evdev snd_page_alloc battery button output pcspkr serio_raw usbhid hid ext4 mbcache jbd2 crc16 usb_storage sg sr_mod sd_mod cdrom pata_acpi ata_generic ahci libahci r8169 uhci_hcd ata_piix mii libata th
Dec 14 09:19:05 Tramp kernel: ermal ehci_hcd [last unloaded: scsi_wait_scan]
Dec 14 09:19:05 Tramp kernel:
Dec 14 09:19:05 Tramp kernel: Pid: 3444, comm: empathy Not tainted 2.6.36-2.dmz.4-liquorix-686 #1         /M-6827                         
Dec 14 09:19:05 Tramp kernel: EIP: 0060:[<c187ac62>] EFLAGS: 00210202 CPU: 0
Dec 14 09:19:05 Tramp kernel: EIP is at 0xc187ac62
Dec 14 09:19:05 Tramp kernel: EAX: c02b6d54 EBX: c187ac20 ECX: f10bed40 EDX: c29b3750
Dec 14 09:19:05 Tramp kernel: ESI: c187ac22 EDI: 00000000 EBP: 00000000 ESP: f1110e94
Dec 14 09:19:05 Tramp kernel: DS: 007b ES: 007b FS: 00d8 GS: 00e0 SS: 0068
Dec 14 09:19:05 Tramp kernel: Process empathy (pid: 3444, ti=f1110000 task=f10fe8a0 task.ti=f1110000)
Dec 14 09:19:05 Tramp kernel: Stack:
Dec 14 09:19:05 Tramp kernel: c187ac20 00000000 00000000 c02c853c c2c05aa0 36461067 c296dc6c af04d000
Dec 14 09:19:05 Tramp kernel: <0> 00000000 f39ee000 00000000 00000001 00000000 00000001 00000001 af04d000
Dec 14 09:19:05 Tramp kernel: <0> c187ac20 f10bedc0 f3bb4af0 af04c000 fffb3134 c02ca333 f3bb4af0 00000001
Dec 14 09:19:05 Tramp kernel: Call Trace:
Dec 14 09:19:05 Tramp kernel: [<c02c853c>] ? __do_fault+0x28c/0x520
Dec 14 09:19:05 Tramp kernel: [<c02ca333>] ? handle_mm_fault+0x223/0xc80
Dec 14 09:19:05 Tramp kernel: [<c0228aa0>] ? do_page_fault+0x0/0x390
Dec 14 09:19:05 Tramp kernel: [<c0228be0>] ? do_page_fault+0x140/0x390
Dec 14 09:19:05 Tramp kernel: [<c02605cb>] ? hrtimer_interrupt+0x1bb/0x2b0
Dec 14 09:19:05 Tramp kernel: [<c02459d1>] ? irq_exit+0x31/0x80
Dec 14 09:19:05 Tramp kernel: [<c021e583>] ? smp_apic_timer_interrupt+0x53/0x90
Dec 14 09:19:05 Tramp kernel: [<c0228aa0>] ? do_page_fault+0x0/0x390
Dec 14 09:19:05 Tramp kernel: [<c054045b>] ? error_code+0x67/0x6c
Dec 14 09:19:05 Tramp kernel: Code: 00 d0 2e 2b c0 04 00 00 00 14 40 00 35 ff ff ff ff 00 00 00 00 00 ac 87 c1 00 00 00 00 00 00 00 00 58 ac 87 c1 58 ac 87 c1 14 40 <00> 35 ff ff ff ff 00 00 00 00 00 ac 87 c1 00 00 00 00 00 00 00
Dec 14 09:19:05 Tramp kernel: EIP: [<c187ac62>] 0xc187ac62 SS:ESP 0068:f1110e94
Dec 14 09:19:05 Tramp kernel: CR2: 00000000ffffffff
Dec 14 09:19:05 Tramp kernel: ---[ end trace f9ecb9944a0d92aa ]---

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Posted: Dec 14, 10, 12:30 Henrik
 Status: Interested
Joined: 06 Oct 2009
Posts: 14
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No change with 2.6.36-2.dmz.4.

Installed .35-9.dmz.1 and found that this kernel doesnt like alsa either... luckily i still had 35-8.dmz.4 in the apt cache folder.
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