Bug 15311
| Summary: | Starting pulseaudio causes a NULL pointer hit | ||
|---|---|---|---|
| Product: | Drivers | Reporter: | Ed Tomlinson (edt) |
| Component: | Sound(ALSA) | Assignee: | Takashi Iwai (tiwai) |
| Status: | CLOSED UNREPRODUCIBLE | ||
| Severity: | normal | CC: | edt, florian, maciej.rutecki, rjw, zajec5 |
| Priority: | P1 | ||
| Hardware: | All | ||
| OS: | Linux | ||
| Kernel Version: | 2.6.33-rc8 | Subsystem: | |
| Regression: | Yes | Bisected commit-id: | |
| Bug Depends on: | |||
| Bug Blocks: | 14885 | ||
Ed: as noone yet cared, let me ask (I'm not any kind of ALSA dev). Could you try to bisect this bug? So we know the commit that introduced this regression? http://landley.net/writing/git-quick.html#bisect http://kernel.osuosl.org/pub/software/scm/git/docs/git-bisect.html Also, is the problem still present in 2.6.33 (final) and/or 2.6.34-rc2? There was a patch suggested by Takashi that drops the locks. But it didn't made it into mainline. The oops has been said to be unrelated. (?) Ed, is this issue still present in current mainline kernels? Does the oops still happen? Does Lockdep still trigger? Regards, Flo *** Bug 15317 has been marked as a duplicate of this bug. *** *Timeout* |
Inorder to get skype working with linux I have the following in .asoundrc for my normal userid. --- pcm.pulse { type pulse } ctl.pulse { type pulse } pcm.!default { type pulse } ctl.!default { type pulse --- Try #1 Starting as root if I do: su - <id> aplay sound.wav <traceback inlined below> aplay sound.wav (silence) killall pulseaudio aplay sound.wav (works as expected now going thru pulseaudio) Try #2 Starting as root if I do: aplay sound.wav (works as expected using alsa alone) su - <id> aplay sound.wav <another lockdep traceback> aplay sound.wav (works as expected now going thru pulseaudio) Try #3 su - <id> pulseaudio -D (lockdep trackback follow by an opps) With .32 there were no tracebacks (lockdep was enabled) and try #1 would work where I now get silence. **** List of PLAYBACK Hardware Devices **** card 0: SB [HDA ATI SB], device 0: ALC1200 Analog [ALC1200 Analog] Subdevices: 0/1 Subdevice #0: subdevice #0 card 0: SB [HDA ATI SB], device 1: ALC1200 Digital [ALC1200 Digital] Subdevices: 1/1 Subdevice #0: subdevice #0 card 1: HDMI [HDA ATI HDMI], device 3: ATI HDMI [ATI HDMI] Subdevices: 1/1 Subdevice #0: subdevice #0 "ALC1200 Analog" is what has speakers connected The em28xx in the traceback is an input source from a usb hdtv dongle. Also posted to lkml as subject: [LOCKDEP] 33-rc8 Running aplay with pulse as the default Thanks Ed Tomlinson --- aplay lockdep traceback (try #1) [ 91.070620] [ 91.070621] ======================================================= [ 91.071378] [ INFO: possible circular locking dependency detected ] [ 91.071378] 2.6.33-rc8-crc #106 [ 91.071378] ------------------------------------------------------- [ 91.071378] pulseaudio/2717 is trying to acquire lock: [ 91.071378] (&dev->lock){+.+.+.}, at: [<ffffffffa02797f1>] snd_em28xx_capture_open+0x61/0x190 [em28xx_alsa] [ 91.071378] [ 91.071378] but task is already holding lock: [ 91.071378] (&pcm->open_mutex){+.+.+.}, at: [<ffffffffa010ecd2>] snd_pcm_open+0x182/0x450 [snd_pcm] [ 91.071378] [ 91.071378] which lock already depends on the new lock. [ 91.071378] [ 91.071378] [ 91.071378] the existing dependency chain (in reverse order) is: [ 91.071378] [ 91.071378] -> #3 (&pcm->open_mutex){+.+.+.}: [ 91.071378] [<ffffffff81083215>] __lock_acquire+0xfc5/0x1550 [ 91.071378] [<ffffffff8108383c>] lock_acquire+0x9c/0x140 [ 91.071378] [<ffffffff814b96c1>] __mutex_lock_common+0x61/0x610 [ 91.071378] [<ffffffff814b9d53>] mutex_lock_nested+0x43/0x50 [ 91.071378] [<ffffffffa010ad32>] snd_pcm_release+0x42/0xb0 [snd_pcm] [ 91.071378] [<ffffffff8112115d>] __fput+0x15d/0x290 [ 91.071378] [<ffffffff811212ad>] fput+0x1d/0x30 [ 91.071378] [<ffffffff810fe001>] remove_vma+0x51/0x80 [ 91.071378] [<ffffffff810ffa1d>] do_munmap+0x2fd/0x390 [ 91.071378] [<ffffffff810ffb06>] sys_munmap+0x56/0x80 [ 91.071378] [<ffffffff81002adb>] system_call_fastpath+0x16/0x1b [ 91.071378] [ 91.071378] -> #2 (&mm->mmap_sem){++++++}: [ 91.071378] [<ffffffff81083215>] __lock_acquire+0xfc5/0x1550 [ 91.071378] [<ffffffff8108383c>] lock_acquire+0x9c/0x140 [ 91.071378] [<ffffffff810f62c7>] might_fault+0xa7/0xd0 [ 91.071378] [<ffffffff8113102b>] filldir+0x7b/0xe0 [ 91.071378] [<ffffffff8118aa21>] sysfs_readdir+0xf1/0x1b0 [ 91.071378] [<ffffffff81131268>] vfs_readdir+0xb8/0xe0 [ 91.071378] [<ffffffff8113144d>] sys_getdents+0xad/0x110 [ 91.071378] [<ffffffff81002adb>] system_call_fastpath+0x16/0x1b [ 91.071378] [ 91.071378] -> #1 (sysfs_mutex){+.+.+.}: [ 91.071378] [<ffffffff81083215>] __lock_acquire+0xfc5/0x1550 [ 91.071378] [<ffffffff8108383c>] lock_acquire+0x9c/0x140 [ 91.071378] [<ffffffff814b96c1>] __mutex_lock_common+0x61/0x610 [ 91.071378] [<ffffffff814b9d53>] mutex_lock_nested+0x43/0x50 [ 91.071378] [<ffffffff8118b082>] sysfs_addrm_start+0x22/0x30 [ 91.071378] [<ffffffff8118bc58>] create_dir+0x58/0xb0 [ 91.514885] [<ffffffff8118bd0a>] sysfs_create_dir+0x5a/0x70 [ 91.514885] [<ffffffff8123ebbd>] kobject_add_internal+0xbd/0x1f0 [ 91.514885] [<ffffffff8123ee08>] kobject_add_varg+0x38/0x60 [ 91.514885] [<ffffffff8123eee4>] kobject_add+0x44/0x70 [ 91.514885] [<ffffffff81392510>] device_add+0xb0/0x5e0 [ 91.514885] [<ffffffff81392a5e>] device_register+0x1e/0x30 [ 91.514885] [<ffffffff8140a50d>] i2c_register_adapter+0x12d/0x250 [ 91.514885] [<ffffffff8140a7f1>] i2c_add_adapter+0xb1/0xd0 [ 91.514885] [<ffffffffa0231ba4>] em28xx_i2c_register+0x104/0x520 [em28xx] [ 91.514885] [<ffffffffa0233daa>] em28xx_usb_probe+0x68a/0xb90 [em28xx] [ 91.514885] [<ffffffff813eb4ab>] usb_probe_interface+0xeb/0x1b0 [ 91.514885] [<ffffffff81395546>] driver_probe_device+0xc6/0x1d0 [ 91.514885] [<ffffffff813956eb>] __driver_attach+0x9b/0xa0 [ 91.514885] [<ffffffff8139492c>] bus_for_each_dev+0x6c/0xa0 [ 91.514885] [<ffffffff8139535e>] driver_attach+0x1e/0x20 [ 91.514885] [<ffffffff81394c11>] bus_add_driver+0xe1/0x280 [ 91.514885] [<ffffffff81395a58>] driver_register+0x98/0x140 [ 91.514885] [<ffffffff813ea06c>] usb_register_driver+0xdc/0x1a0 [ 91.514885] [<ffffffffa0248023>] 0xffffffffa0248023 [ 91.514885] [<ffffffff810001dc>] do_one_initcall+0x3c/0x1d0 [ 91.514885] [<ffffffff81092d75>] sys_init_module+0xe5/0x250 [ 91.514885] [<ffffffff81002adb>] system_call_fastpath+0x16/0x1b [ 91.514885] [ 91.514885] -> #0 (&dev->lock){+.+.+.}: [ 91.514885] [<ffffffff81083668>] __lock_acquire+0x1418/0x1550 [ 91.514885] [<ffffffff8108383c>] lock_acquire+0x9c/0x140 [ 91.514885] [<ffffffff814b96c1>] __mutex_lock_common+0x61/0x610 [ 91.514885] [<ffffffff814b9d53>] mutex_lock_nested+0x43/0x50 [ 91.514885] [<ffffffffa02797f1>] snd_em28xx_capture_open+0x61/0x190 [em28xx_alsa] [ 91.514885] [<ffffffffa010adee>] snd_pcm_open_substream+0x4e/0x90 [snd_pcm] [ 91.514885] [<ffffffffa010ece9>] snd_pcm_open+0x199/0x450 [snd_pcm] [ 91.514885] [<ffffffffa010efd4>] snd_pcm_capture_open+0x34/0x40 [snd_pcm] [ 91.514885] [<ffffffffa00c5778>] snd_open+0x198/0x4e0 [snd] [ 91.514885] [<ffffffff8112384d>] chrdev_open+0x17d/0x320 [ 91.514885] [<ffffffff8111d358>] __dentry_open+0x1a8/0x400 [ 91.514885] [<ffffffff8111d6b4>] nameidata_to_filp+0x54/0x70 [ 91.514885] [<ffffffff8112e7f1>] do_filp_open+0x841/0xc00 [ 91.514885] [<ffffffff8111e954>] do_sys_open+0xa4/0x180 [ 91.514885] [<ffffffff8111ea70>] sys_open+0x20/0x30 [ 91.514885] [<ffffffff81002adb>] system_call_fastpath+0x16/0x1b [ 91.514885] [ 91.514885] other info that might help us debug this: [ 91.514885] [ 91.514885] 1 lock held by pulseaudio/2717: [ 91.514885] #0: (&pcm->open_mutex){+.+.+.}, at: [<ffffffffa010ecd2>] snd_pcm_open+0x182/0x450 [snd_pcm] [ 91.514885] [ 91.514885] stack backtrace: [ 91.514885] Pid: 2717, comm: pulseaudio Not tainted 2.6.33-rc8-crc #106 [ 91.514885] Call Trace: [ 91.514885] [<ffffffff81080fd9>] print_circular_bug+0xe9/0xf0 [ 91.514885] [<ffffffff81083668>] __lock_acquire+0x1418/0x1550 [ 91.514885] [<ffffffff81081dc8>] ? debug_check_no_locks_freed+0xc8/0x150 [ 91.514885] [<ffffffff8108383c>] lock_acquire+0x9c/0x140 [ 91.514885] [<ffffffffa02797f1>] ? snd_em28xx_capture_open+0x61/0x190 [em28xx_alsa] [ 91.514885] [<ffffffff814b96c1>] __mutex_lock_common+0x61/0x610 [ 91.514885] [<ffffffffa02797f1>] ? snd_em28xx_capture_open+0x61/0x190 [em28xx_alsa] [ 91.514885] [<ffffffffa02797f1>] ? snd_em28xx_capture_open+0x61/0x190 [em28xx_alsa] [ 91.514885] [<ffffffffa0109c70>] ? snd_pcm_hw_rule_muldivk+0x0/0xa0 [snd_pcm] [ 91.514885] [<ffffffff8107fd54>] ? lockdep_init_map+0x44/0x130 [ 91.514885] [<ffffffff814b9d53>] mutex_lock_nested+0x43/0x50 [ 91.514885] [<ffffffffa02797f1>] snd_em28xx_capture_open+0x61/0x190 [em28xx_alsa] [ 91.514885] [<ffffffffa010adee>] snd_pcm_open_substream+0x4e/0x90 [snd_pcm] [ 91.514885] [<ffffffffa010ece9>] snd_pcm_open+0x199/0x450 [snd_pcm] [ 91.514885] [<ffffffff81081cfd>] ? trace_hardirqs_on+0xd/0x10 [ 91.514885] [<ffffffff810434f0>] ? default_wake_function+0x0/0x20 [ 91.514885] [<ffffffff814b965e>] ? mutex_unlock+0xe/0x10 [ 91.514885] [<ffffffffa010efd4>] snd_pcm_capture_open+0x34/0x40 [snd_pcm] [ 91.514885] [<ffffffffa00c5778>] snd_open+0x198/0x4e0 [snd] [ 91.514885] [<ffffffff8112384d>] chrdev_open+0x17d/0x320 [ 91.514885] [<ffffffff8111d358>] __dentry_open+0x1a8/0x400 [ 91.514885] [<ffffffff811236d0>] ? chrdev_open+0x0/0x320 [ 91.514885] [<ffffffff8111d6b4>] nameidata_to_filp+0x54/0x70 [ 91.514885] [<ffffffff8112e7f1>] do_filp_open+0x841/0xc00 [ 91.514885] [<ffffffff814bf981>] ? sub_preempt_count+0x51/0x60 [ 91.514885] [<ffffffff814bbb7c>] ? _raw_spin_unlock+0x5c/0x70 [ 91.514885] [<ffffffff8111e954>] do_sys_open+0xa4/0x180 [ 91.514885] [<ffffffff8111ea70>] sys_open+0x20/0x30 [ 91.514885] [<ffffffff81002adb>] system_call_fastpath+0x16/0x1b [ 92.643423] hda-intel: IRQ timing workaround is activated for card #0. Suggest a bigger bdl_pos_adj. --- pulseaudio traceback and opps - Try #3 [ 87.254952] ======================================================= [ 87.255252] [ INFO: possible circular locking dependency detected ] [ 87.255252] 2.6.33-rc8-crc #106 [ 87.255252] ------------------------------------------------------- [ 87.255252] pulseaudio/2800 is trying to acquire lock: [ 87.255252] (&dev->lock){+.+.+.}, at: [<ffffffffa027d7f1>] snd_em28xx_capture_open+0x61/0x190 [em28xx_alsa] [ 87.336024] [ 87.336024] but task is already holding lock: [ 87.336024] (&pcm->open_mutex){+.+.+.}, at: [<ffffffffa00ffcd2>] snd_pcm_open+0x182/0x450 [snd_pcm] [ 87.336024] [ 87.336024] which lock already depends on the new lock. [ 87.336024] [ 87.336024] [ 87.336024] the existing dependency chain (in reverse order) is: [ 87.336024] [ 87.336024] -> #3 (&pcm->open_mutex){+.+.+.}: [ 87.336024] [<ffffffff81083215>] __lock_acquire+0xfc5/0x1550 [ 87.336024] [<ffffffff8108383c>] lock_acquire+0x9c/0x140 [ 87.336024] [<ffffffff814b96c1>] __mutex_lock_common+0x61/0x610 [ 87.336024] [<ffffffff814b9d53>] mutex_lock_nested+0x43/0x50 [ 87.336024] [<ffffffffa00fbd32>] snd_pcm_release+0x42/0xb0 [snd_pcm] [ 87.336024] [<ffffffff8112115d>] __fput+0x15d/0x290 [ 87.336024] [<ffffffff811212ad>] fput+0x1d/0x30 [ 87.336024] [<ffffffff810fe001>] remove_vma+0x51/0x80 [ 87.336024] [<ffffffff810ffa1d>] do_munmap+0x2fd/0x390 [ 87.336024] [<ffffffff810ffb06>] sys_munmap+0x56/0x80 [ 87.336024] [<ffffffff81002adb>] system_call_fastpath+0x16/0x1b [ 87.336024] [ 87.336024] -> #2 (&mm->mmap_sem){++++++}: [ 87.336024] [<ffffffff81083215>] __lock_acquire+0xfc5/0x1550 [ 87.336024] [<ffffffff8108383c>] lock_acquire+0x9c/0x140 [ 87.336024] [<ffffffff810f62c7>] might_fault+0xa7/0xd0 [ 87.336024] [<ffffffff8113102b>] filldir+0x7b/0xe0 [ 87.336024] [<ffffffff8118aa21>] sysfs_readdir+0xf1/0x1b0 [ 87.336024] [<ffffffff81131268>] vfs_readdir+0xb8/0xe0 [ 87.336024] [<ffffffff8113144d>] sys_getdents+0xad/0x110 [ 87.336024] [<ffffffff81002adb>] system_call_fastpath+0x16/0x1b [ 87.336024] [ 87.336024] -> #1 (sysfs_mutex){+.+.+.}: [ 87.336024] [<ffffffff81083215>] __lock_acquire+0xfc5/0x1550 [ 87.336024] [<ffffffff8108383c>] lock_acquire+0x9c/0x140 [ 87.336024] [<ffffffff814b96c1>] __mutex_lock_common+0x61/0x610 [ 87.336024] [<ffffffff814b9d53>] mutex_lock_nested+0x43/0x50 [ 87.336024] [<ffffffff8118b082>] sysfs_addrm_start+0x22/0x30 [ 87.336024] [<ffffffff8118bc58>] create_dir+0x58/0xb0 [ 87.336024] [<ffffffff8118bd0a>] sysfs_create_dir+0x5a/0x70 [ 87.336024] [<ffffffff8123ebbd>] kobject_add_internal+0xbd/0x1f0 [ 87.336024] [<ffffffff8123ee08>] kobject_add_varg+0x38/0x60 [ 87.336024] [<ffffffff8123eee4>] kobject_add+0x44/0x70 [ 87.336024] [<ffffffff81392510>] device_add+0xb0/0x5e0 [ 87.336024] [<ffffffff81392a5e>] device_register+0x1e/0x30 [ 87.336024] [<ffffffff8140a50d>] i2c_register_adapter+0x12d/0x250 [ 87.336024] [<ffffffff8140a7f1>] i2c_add_adapter+0xb1/0xd0 [ 87.336024] [<ffffffffa0207ba4>] em28xx_i2c_register+0x104/0x520 [em28xx] [ 87.336024] [<ffffffffa0209daa>] em28xx_usb_probe+0x68a/0xb90 [em28xx] [ 87.336024] [<ffffffff813eb4ab>] usb_probe_interface+0xeb/0x1b0 [ 87.336024] [<ffffffff81395546>] driver_probe_device+0xc6/0x1d0 [ 87.336024] [<ffffffff813956eb>] __driver_attach+0x9b/0xa0 [ 87.336024] [<ffffffff8139492c>] bus_for_each_dev+0x6c/0xa0 [ 87.336024] [<ffffffff8139535e>] driver_attach+0x1e/0x20 [ 87.336024] [<ffffffff81394c11>] bus_add_driver+0xe1/0x280 [ 87.336024] [<ffffffff81395a58>] driver_register+0x98/0x140 [ 87.336024] [<ffffffff813ea06c>] usb_register_driver+0xdc/0x1a0 [ 87.336024] [<ffffffffa021e023>] 0xffffffffa021e023 [ 87.336024] [<ffffffff810001dc>] do_one_initcall+0x3c/0x1d0 [ 87.336024] [<ffffffff81092d75>] sys_init_module+0xe5/0x250 [ 87.336024] [<ffffffff81002adb>] system_call_fastpath+0x16/0x1b [ 87.336024] [ 87.336024] -> #0 (&dev->lock){+.+.+.}: [ 87.336024] [<ffffffff81083668>] __lock_acquire+0x1418/0x1550 [ 87.336024] [<ffffffff8108383c>] lock_acquire+0x9c/0x140 [ 87.336024] [<ffffffff814b96c1>] __mutex_lock_common+0x61/0x610 [ 87.336024] [<ffffffff814b9d53>] mutex_lock_nested+0x43/0x50 [ 87.336024] [<ffffffffa027d7f1>] snd_em28xx_capture_open+0x61/0x190 [em28xx_alsa] [ 87.336024] [<ffffffffa00fbdee>] snd_pcm_open_substream+0x4e/0x90 [snd_pcm] [ 87.336024] [<ffffffffa00ffce9>] snd_pcm_open+0x199/0x450 [snd_pcm] [ 87.336024] [<ffffffffa00fffd4>] snd_pcm_capture_open+0x34/0x40 [snd_pcm] [ 87.336024] [<ffffffffa00da778>] snd_open+0x198/0x4e0 [snd] [ 87.336024] [<ffffffff8112384d>] chrdev_open+0x17d/0x320 [ 87.336024] [<ffffffff8111d358>] __dentry_open+0x1a8/0x400 [ 87.336024] [<ffffffff8111d6b4>] nameidata_to_filp+0x54/0x70 [ 87.336024] [<ffffffff8112e7f1>] do_filp_open+0x841/0xc00 [ 87.336024] [<ffffffff8111e954>] do_sys_open+0xa4/0x180 [ 87.336024] [<ffffffff8111ea70>] sys_open+0x20/0x30 [ 87.336024] [<ffffffff81002adb>] system_call_fastpath+0x16/0x1b [ 87.336024] [ 87.336024] other info that might help us debug this: [ 87.336024] [ 87.336024] 1 lock held by pulseaudio/2800: [ 87.336024] #0: (&pcm->open_mutex){+.+.+.}, at: [<ffffffffa00ffcd2>] snd_pcm_open+0x182/0x450 [snd_pcm] [ 87.336024] [ 87.336024] stack backtrace: [ 87.336024] Pid: 2800, comm: pulseaudio Not tainted 2.6.33-rc8-crc #106 [ 87.336024] Call Trace: [ 87.336024] [<ffffffff81080fd9>] print_circular_bug+0xe9/0xf0 [ 87.336024] [<ffffffff81083668>] __lock_acquire+0x1418/0x1550 [ 87.336024] [<ffffffff81081dc8>] ? debug_check_no_locks_freed+0xc8/0x150 [ 87.336024] [<ffffffff8108383c>] lock_acquire+0x9c/0x140 [ 87.336024] [<ffffffffa027d7f1>] ? snd_em28xx_capture_open+0x61/0x190 [em28xx_alsa] [ 87.336024] [<ffffffff814b96c1>] __mutex_lock_common+0x61/0x610 [ 87.336024] [<ffffffffa027d7f1>] ? snd_em28xx_capture_open+0x61/0x190 [em28xx_alsa] [ 87.336024] [<ffffffffa027d7f1>] ? snd_em28xx_capture_open+0x61/0x190 [em28xx_alsa] [ 87.336024] [<ffffffffa00fac70>] ? snd_pcm_hw_rule_muldivk+0x0/0xa0 [snd_pcm] [ 87.336024] [<ffffffff8107fd54>] ? lockdep_init_map+0x44/0x130 [ 87.336024] [<ffffffff814b9d53>] mutex_lock_nested+0x43/0x50 [ 87.336024] [<ffffffffa027d7f1>] snd_em28xx_capture_open+0x61/0x190 [em28xx_alsa] [ 87.336024] [<ffffffffa00fbdee>] snd_pcm_open_substream+0x4e/0x90 [snd_pcm] [ 87.336024] [<ffffffffa00ffce9>] snd_pcm_open+0x199/0x450 [snd_pcm] [ 87.336024] [<ffffffff81081cfd>] ? trace_hardirqs_on+0xd/0x10 [ 87.336024] [<ffffffff810434f0>] ? default_wake_function+0x0/0x20 [ 87.336024] [<ffffffff814b965e>] ? mutex_unlock+0xe/0x10 [ 87.336024] [<ffffffffa00fffd4>] snd_pcm_capture_open+0x34/0x40 [snd_pcm] [ 87.336024] [<ffffffffa00da778>] snd_open+0x198/0x4e0 [snd] [ 87.336024] [<ffffffff8112384d>] chrdev_open+0x17d/0x320 [ 87.336024] [<ffffffff8111d358>] __dentry_open+0x1a8/0x400 [ 87.336024] [<ffffffff811236d0>] ? chrdev_open+0x0/0x320 [ 87.336024] [<ffffffff8111d6b4>] nameidata_to_filp+0x54/0x70 [ 87.336024] [<ffffffff8112e7f1>] do_filp_open+0x841/0xc00 [ 87.336024] [<ffffffff814bf981>] ? sub_preempt_count+0x51/0x60 [ 87.336024] [<ffffffff814bbb7c>] ? _raw_spin_unlock+0x5c/0x70 [ 87.336024] [<ffffffff8111e954>] do_sys_open+0xa4/0x180 [ 87.336024] [<ffffffff8111ea70>] sys_open+0x20/0x30 [ 87.336024] [<ffffffff81002adb>] system_call_fastpath+0x16/0x1b [ 89.153381] hda-intel: IRQ timing workaround is activated for card #0. Suggest a bigger bdl_pos_adj. [ 89.402672] BUG: unable to handle kernel NULL pointer dereference at (null) [ 89.403537] IP: [<ffffffff8104dfe6>] do_wait+0x1e6/0x2e0 [ 89.403537] PGD 16c019067 PUD 16c01a067 PMD 0 [ 89.403537] Oops: 0000 [#1] PREEMPT SMP [ 89.403537] last sysfs file: /sys/devices/pci0000:00/0000:00:14.2/sound/card0/uevent [ 89.403537] CPU 1 [ 89.403537] Pid: 2813, comm: console-kit-dae Not tainted 2.6.33-rc8-crc #106 M3A78-T/System Product Name [ 89.403537] RIP: 0010:[<ffffffff8104dfe6>] [<ffffffff8104dfe6>] do_wait+0x1e6/0x2e0 [ 89.403537] RSP: 0018:ffff88016dfcfe88 EFLAGS: 00010293 [ 89.403537] RAX: ffff88016d29c318 RBX: fffffffffffffcf8 RCX: ffff88016b77d800 [ 89.403537] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff81a7f4c8 [ 89.403537] RBP: ffff88016dfcfee8 R08: 0000000000000002 R09: 0000000000000000 [ 89.403537] R10: 0000000000000000 R11: 0000000000000246 R12: ffff88016dfcff08 [ 89.403537] R13: ffff88016d29c020 R14: ffff88016bd38000 R15: ffff88016bd38000 [ 89.403537] FS: 00007f7fd4a7b700(0000) GS:ffff880028280000(0000) knlGS:0000000000000000 [ 89.403537] CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b [ 89.403537] CR2: 0000000000000000 CR3: 000000016b12e000 CR4: 00000000000006e0 [ 89.403537] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 89.600024] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400 [ 89.600024] Process console-kit-dae (pid: 2813, threadinfo ffff88016dfce000, task ffff88016bd38000) [ 89.600024] Stack: [ 89.600024] ffff88016bd38000 ffff88016bd38000 ffff88016dfcff30 ffff88016d29c318 [ 89.600024] <0> ffff88016dfcfee8 0000000000000000 ffffffff81069880 00007fff88aaff4c [ 89.600024] <0> ffff88016b77d880 0000000000000000 000000000061ea60 00007fff88aaff9c [ 89.600024] Call Trace: [ 89.600024] [<ffffffff81069880>] ? find_get_pid+0x0/0x80 [ 89.600024] [<ffffffff8104e169>] sys_wait4+0x89/0xf0 [ 89.600024] [<ffffffff8104b650>] ? child_wait_callback+0x0/0x80 [ 89.600024] [<ffffffff81002adb>] system_call_fastpath+0x16/0x1b [ 89.600024] Code: eb 29 0f 1f 00 48 89 da be 01 00 00 00 4c 89 e7 e8 f0 f1 ff ff 85 c0 0f 85 d0 00 00 00 48 8b 9b 08 03 00 00 48 81 eb 08 03 00 00 <48> 8b 83 08 03 00 00 0f 18 08 48 8d 83 08 03 00 00 48 39 45 b8 [ 89.600024] RIP [<ffffffff8104dfe6>] do_wait+0x1e6/0x2e0 [ 89.600024] RSP <ffff88016dfcfe88> [ 89.600024] CR2: 0000000000000000 [ 89.600489] ---[ end trace 3efd4205cd3392b3 ]--- [ 89.600492] note: console-kit-dae[2813] exited with preempt_count 1 ---