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Bug#517586: Found in 2.6.26-2-amd64

dann frazier wrote:

On Thu, Aug 06, 2009 at 08:24:40AM +0100, Berni Elbourn wrote:

See also Bug #517449


Note that soft lockups are a class of bug, they can have many
causes. If you think this is related to the SCHED_IDLE issue, please
let us know why - I don't see a relation myself.



I am sorry if this is noise.
I arrived here due to a reference in #517449. #517449 seems to relate to virtual hosts. To my untrained eye the logs here look similar... 

Here is an detail example of the log round the pdflush task hangup:
Aug 6 06:26:46 sv28 kernel: [1300761.990362] INFO: task pdflush:18830 blocked for more than 120 seconds. Aug 6 06:26:46 sv28 kernel: [1300761.990362] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. Aug 6 06:26:46 sv28 kernel: [1300761.990362] pdflush D 0000000000000000 0 18830 2 Aug 6 06:26:46 sv28 kernel: [1300761.990362] ffff81008bdf7a50 0000000000000046 0000000000000000 ffffffff802284eb Aug 6 06:26:46 sv28 kernel: [1300761.990362] ffff8102246e15f0 ffff8102270b1470 ffff8102246e1878 0000000100000001 Aug 6 06:26:46 sv28 kernel: [1300761.990362] 0000000000000282 0000000000000000 00000000ffffffff 0000000000000000 
Aug  6 06:26:46 sv28 kernel: [1300761.990362] Call Trace:
Aug 6 06:26:46 sv28 kernel: [1300761.990362] [<ffffffff802284eb>] __wake_up_common+0x41/0x74 Aug 6 06:26:46 sv28 kernel: [1300761.990362] [<ffffffffa013c360>] :raid1:wait_barrier+0x87/0xc8 Aug 6 06:26:46 sv28 kernel: [1300761.990362] [<ffffffff8022c257>] default_wake_function+0x0/0xe Aug 6 06:26:46 sv28 kernel: [1300761.990362] [<ffffffffa013dcfd>] :raid1:make_request+0x73/0x58e Aug 6 06:26:46 sv28 kernel: [1300761.990362] [<ffffffff8031da6b>] __up_read+0x13/0x8a Aug 6 06:26:46 sv28 kernel: [1300761.990362] [<ffffffff8030c46e>] generic_make_request+0x2fe/0x339 Aug 6 06:26:46 sv28 kernel: [1300761.990362] [<ffffffff80273374>] mempool_alloc+0x24/0xda Aug 6 06:26:46 sv28 kernel: [1300761.990362] [<ffffffff8030d82c>] submit_bio+0xdb/0xe2 Aug 6 06:26:46 sv28 kernel: [1300761.990362] [<ffffffff802b9fb6>] submit_bh+0xd9/0xf9 Aug 6 06:26:46 sv28 kernel: [1300761.990362] [<ffffffff802bb9f0>] __block_write_full_page+0x1bd/0x2ac Aug 6 06:26:46 sv28 kernel: [1300761.990362] [<ffffffff802bf6c1>] blkdev_get_block+0x0/0x46 Aug 6 06:26:46 sv28 kernel: [1300761.990362] [<ffffffff802770c7>] __writepage+0xa/0x23 Aug 6 06:26:46 sv28 kernel: [1300761.990362] [<ffffffff8027758c>] write_cache_pages+0x182/0x2b1 Aug 6 06:26:46 sv28 kernel: [1300761.990362] [<ffffffff802770bd>] __writepage+0x0/0x23 Aug 6 06:26:46 sv28 kernel: [1300761.990362] [<ffffffff802776f7>] do_writepages+0x20/0x2d Aug 6 06:26:46 sv28 kernel: [1300761.990362] [<ffffffff802b6450>] __writeback_single_inode+0x144/0x29d Aug 6 06:26:46 sv28 kernel: [1300761.990362] [<ffffffffa01459c1>] :dm_mod:dm_table_any_congested+0x46/0x69 Aug 6 06:26:46 sv28 kernel: [1300761.990362] [<ffffffff802b6914>] sync_sb_inodes+0x1b1/0x293 Aug 6 06:26:46 sv28 kernel: [1300761.990362] [<ffffffff802b6d42>] writeback_inodes+0x62/0xb3 Aug 6 06:26:46 sv28 kernel: [1300761.990362] [<ffffffff80278053>] wb_kupdate+0x9e/0x114 Aug 6 06:26:46 sv28 kernel: [1300761.990362] [<ffffffff80278422>] pdflush+0x0/0x211 Aug 6 06:26:46 sv28 kernel: [1300761.990362] [<ffffffff80278586>] pdflush+0x164/0x211 Aug 6 06:26:46 sv28 kernel: [1300761.990362] [<ffffffff80277fb5>] wb_kupdate+0x0/0x114 Aug 6 06:26:46 sv28 kernel: [1300761.990362] [<ffffffff8024608b>] kthread+0x47/0x74 Aug 6 06:26:46 sv28 kernel: [1300761.990362] [<ffffffff802301ec>] schedule_tail+0x27/0x5c Aug 6 06:26:46 sv28 kernel: [1300761.990362] [<ffffffff8020cf28>] child_rip+0xa/0x12 Aug 6 06:26:46 sv28 kernel: [1300761.990362] [<ffffffff8021a82a>] lapic_next_event+0xf/0x13 Aug 6 06:26:46 sv28 kernel: [1300761.990362] [<ffffffff80246044>] kthread+0x0/0x74 Aug 6 06:26:46 sv28 kernel: [1300761.990362] [<ffffffff8020cf1e>] child_rip+0x0/0x12 

And cat /proc/version:
Linux version 2.6.26-2-amd64 (Debian 2.6.26-15) (dannf@debian.org) (gcc version 4.1.3 20080704 (prerelease) (Debian 4.1.2-25)) #1 SMP Fri Mar 27 04:02:59 UTC 2009 

Cheers,

Berni
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