[BUG] Sound related problem with Linux-2.6.31-rc8-git1-rt9

[Tarkan Erimer]

When I ran a movie, I got these errors in dmesg. Also, sound began to skip too 
fastly. My audio device is:

tarkane@tarkane:~$ lspci | grep -i audio
00:1b.0 Audio device: Intel Corporation 82801G (ICH7 Family) High Definition 
Audio Controller (rev 01)


Tarkan Erimer


[81001.954666] BUG: unable to handle kernel NULL pointer dereference at 
00000000000000a8                                           
[81001.954677] IP: [<ffffffffa010f4b5>] snd_pcm_period_elapsed+0x11/0x1ec 
[snd_pcm]                                                
[81001.954701] PGD 1a028067 PUD 1a022067 PMD 0                                                                                     
[81001.954708] Oops: 0000 [#1] PREEMPT SMP                                                                                         
[81001.954713] last sysfs file: 
/sys/devices/pci0000:00/0000:00:1d.7/usb5/5-8/5-8:1.0/host5/target5:0:0/5:0:0:0/block/sdb/size     
[81001.954718] CPU 1                                                                                                               
[81001.954721] Modules linked in: nls_iso8859_1 nls_cp437 vfat fat usb_storage 
nfs lockd fscache nfs_acl auth_rpcgss sunrpc xt_multiport iptable_filter 
ip_tables x_tables binfmt_misc bridge stp llc bnep xfrm_user xfrm4_tunnel 
tunnel4 ipcomp xfrm_ipcomp esp4 ah4 deflate ctr twofish twofish_common 
camellia serpent blowfish cast5 des_generic cbc aes_x86_64 aes_generic xcbc 
rmd160 sha256_generic sha1_generic crypto_null af_key xfs exportfs btrfs 
zlib_deflate crc32c libcrc32c snd_hda_codec_realtek snd_hda_intel 
snd_hda_codec snd_pcm_oss snd_mixer_oss snd_pcm snd_seq_dummy snd_seq_oss 
snd_seq_midi snd_rawmidi snd_seq_midi_event snd_seq snd_timer iTCO_wdt 
snd_seq_device iTCO_vendor_support snd soundcore snd_page_alloc psmouse 
serio_raw pcspkr usbhid ehci_hcd uhci_hcd tg3 floppy     
[81001.954806] Pid: 2180, comm: hd-audio0 Not tainted 2.6.31-rc8-git1 #4 HP 
Compaq dc7600 Small Form Factor                        
[81001.954810] RIP: 0010:[<ffffffffa010f4b5>]  [<ffffffffa010f4b5>] 
snd_pcm_period_elapsed+0x11/0x1ec [snd_pcm]                    
[81001.954827] RSP: 0018:ffff88003a0cddd0  EFLAGS: 00010282                                                                        
[81001.954831] RAX: 0000000000000000 RBX: ffff88003a1cf9e0 RCX: 
0000000000000000                                                   
[81001.954834] RDX: 0000000000000001 RSI: 0000000000000003 RDI: 
0000000000000000                                                   
[81001.954837] RBP: 0000000000000004 R08: ffff88003a1cf9e0 R09: 
00000000ffffffff                                                   
[81001.954841] R10: 0000000000000013 R11: ffffffff81033a48 R12: 
ffff88003a49cc48                                                   
[81001.954844] R13: 0000000000000000 R14: ffff88003a49cc00 R15: 
ffffffffa014c092                                                   
[81001.954849] FS:  0000000000000000(0000) GS:ffff8800017f8000(0000) 
knlGS:0000000000000000                                        
[81001.954853] CS:  0010 DS: 0018 ES: 0018 CR0: 000000008005003b                                                                   
[81001.954856] CR2: 00000000000000a8 CR3: 000000001a01b000 CR4: 
00000000000006a0                                                   
[81001.954860] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 
0000000000000000                                                   
[81001.954863] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 
0000000000000400                                                   
[81001.954868] Process hd-audio0 (pid: 2180, threadinfo ffff88003a0cc000, task 
ffff88003f197750)                                   
[81001.954870] Stack:                                                                                                              
[81001.954872]  0000000000000000 ffff88003a1cf9e0 0000000000000004 
ffff88003a49cc48                                                
[81001.954878] <0> 0000000000000000 ffff88003a49cc00 ffffffffa014c092 
ffffffffa014c11c                                             
[81001.954884] <0> ffff88003a0cdec8 ffffc9000260c100 ffff88003a49cdf0 
ffff88003a49cdf8                                             
[81001.954892] Call Trace:                                                                                                         
[81001.954905]  [<ffffffffa014c092>] ? azx_irq_pending_work+0x0/0xbc 
[snd_hda_intel]                                               
[81001.954914]  [<ffffffffa014c11c>] ? azx_irq_pending_work+0x8a/0xbc 
[snd_hda_intel]                                              
[81001.954923]  [<ffffffff81051f35>] ? worker_thread+0x1cb/0x268                                                                   
[81001.954928]  [<ffffffff81056355>] ? autoremove_wake_function+0x0/0x2e                                                           
[81001.954933]  [<ffffffff81051d6a>] ? worker_thread+0x0/0x268                                                                     
[81001.954938]  [<ffffffff81055f9c>] ? kthread+0x8b/0x93                                                                           
[81001.954944]  [<ffffffff81011c5a>] ? child_rip+0xa/0x20                                                                          
[81001.954949]  [<ffffffff81055f11>] ? kthread+0x0/0x93                                                                            
[81001.954953]  [<ffffffff81011c50>] ? child_rip+0x0/0x20                                                                          
[81001.954955] Code: 01 00 00 31 c9 ba 01 00 00 00 be 06 00 00 00 e8 5d 7c f2 
e0 31 c9 89 c8 5f c3 41 57 41 56 41 55 41 54 55 53 48 83 ec 08 49 89 fd <4c> 
8b bf a8 00 00 00 49 8b 87 b0 02 00 00 48 85 c0 74 02 ff d0
[81001.955011] RIP  [<ffffffffa010f4b5>] snd_pcm_period_elapsed+0x11/0x1ec 
[snd_pcm]
[81001.955026]  RSP <ffff88003a0cddd0>
[81001.955029] CR2: 00000000000000a8
[81001.955033] ---[ end trace 552f354de445b720 ]---
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