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SubjectRe: PROBLEM: Oops while doing Disk IO + playing sound, 2.6.20 too -> STATUS git-bisect

I just had the same problem with a 2.6.20 kernel, just after the boot,
after having launched Mozilla Firefox. The browser seemed to lag while
rendering a page, and after say 20 seconds, I got an oops.

I was *not* playing sound.

This message is repeated a HUGE amount of times in my syslog :

__find_get_block_slow() failed. block=1570988, b_blocknr=1562796
b_state=0x00000029, b_size=4096
device blocksize: 4096

And finally, I got the Ooops:

BUG: unable to handle kernel paging request at virtual address 0491c624
printing eip:
*pde = 00000000
Oops: 0002 [#1]
Modules linked in: binfmt_misc ipv6 video container button battery ac
af_packet tsdev usbhid snd_intel8x0 snd_ac97_codec ac97_bus snd_pcm_oss
snd_mixer_oss psmouse e1000 snd_pcm snd_timer serio_raw evdev intel_agp
agpgart snd soundcore snd_page_alloc rtc ext3 jbd ehci_hcd uhci_hcd
usbcore ide_generic ide_cd cdrom ide_disk piix generic ide_core thermal
processor fan
CPU: 0
EIP: 0060:[drop_buffers+91/240] Not tainted VLI
EFLAGS: 00010286 (2.6.20 #1)
EIP is at drop_buffers+0x5b/0xf0
eax: df91c620 ebx: df91c5f8 ecx: df91c620 edx: 0491c620
esi: df91c5f8 edi: c13f3a80 ebp: df91c5f8 esp: dfa13ddc
ds: 007b es: 007b ss: 0068
Process kswapd0 (pid: 108, ti=dfa12000 task=dfa55550 task.ti=dfa12000)
Stack: c12d8ea0 00000000 c01550c5 dfa6cbbc dfa13e04 c13f3a80 00000000
c13f3a98 c0180db8 00000000 c13f3a80 c031ec44 c0149a1d dfa13f08
dfa13ef8 dfa13f00 c031ed14 dfa13f78 00000020 00000000 00000000
Call Trace:
[move_to_swap_cache+69/96] move_to_swap_cache+0x45/0x60
[try_to_free_buffers+56/160] try_to_free_buffers+0x38/0xa0
[shrink_inactive_list+1805/2128] shrink_inactive_list+0x70d/0x850
[__pagevec_release+21/32] __pagevec_release+0x15/0x20
[shrink_zone+152/256] shrink_zone+0x98/0x100
[kswapd+797/1072] kswapd+0x31d/0x430
[autoremove_wake_function+0/80] autoremove_wake_function+0x0/0x50
[kswapd+0/1072] kswapd+0x0/0x430
[kthread+168/224] kthread+0xa8/0xe0
[kthread+0/224] kthread+0x0/0xe0
[kernel_thread_helper+7/20] kernel_thread_helper+0x7/0x14
Code: 8b 02 83 e0 06 0b 42 34 75 74 8b 52 04 39 d6 75 dc 89 f3 eb 06 39
ee 89 eb 74 3e 8b 53 28 8d 4b 28 8b 6b 04 39 d1 74 ed 8b 41 04 <89> 42
04 89 10 89 49 04 89 4b 28 8b 4b 30 85 c9 74 4b 8b 03 f6
EIP: [drop_buffers+91/240] drop_buffers+0x5b/0xf0 SS:ESP 0068:dfa13ddc
<6>note: kswapd0[108] exited with preempt_count 1
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