This is the offending process:
pdflush D 00000001 4294957500 10 1 11 9 (L-TLB)
dfdd5d28 00000046 c039d540 00000001 00000003 c02450f3 d4cc7a44 dfdd5d18
dfdd5d18 dfda16a0 dfdd5d1c c03d7380 dfdd7980 00000283 00000246 ce311a0c
c039d540 c03d7a00 dfdd5d64 dfdd5d34 c011ddb4 ce16a888 dfdd5d90 c0160ad9
Call Trace:
[<c02450f3>] generic_unplug_device+0x83/0xc0
[<c011ddb4>] io_schedule+0x24/0x30
[<c0160ad9>] __wait_on_buffer+0x99/0xd0
[<c011f210>] autoremove_wake_function+0x0/0x50
[<c011f210>] autoremove_wake_function+0x0/0x50
[<c01e57dd>] flush_commit_list+0x34d/0x440
[<c01e9f8c>] do_journal_end+0x71c/0xbe0
[<c01e911d>] flush_old_commits+0x12d/0x1c0
[<c01b5521>] __log_start_commit+0x31/0x40
[<c01d6c48>] reiserfs_write_super+0xa8/0xf0
[<c0166784>] sync_supers+0x164/0x180
[<c01434d8>] wb_kupdate+0x48/0x190
[<c011c2e4>] schedule+0x114/0x5e0
[<c0143d32>] __pdflush+0x162/0x350
[<c0143f20>] pdflush+0x0/0x20
[<c0143f31>] pdflush+0x11/0x20
[<c0143490>] wb_kupdate+0x0/0x190
[<c01073b9>] kernel_thread_helper+0x5/0xc
It looks like some IO got submitted and then was simply lost.
I can see you're using SMP. Preempt or not?
What disk controller hardware are you using? And which device drivers
for that hardware?
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