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Many processes stuck in blk_congestion_wait

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From: Sev Binello <sev@...>
To: <linux-kernel@...>
Subject: Many processes stuck in blk_congestion_wait
Date: Wednesday, January 23, 2008 - 6:19 pm

We are experiencing numerous hangs/slow downs on our WS4 U5 nfs client

machines (not seen on WS3).

Many processes end up in a D state for long periods of time

and are in  blk_congestion_wait().


Time in this state can vary,

not sure what triggers them to come out, some don't

But time in this state can be quite lengthy.

Machines are running 2.6.9-55.0.9.ELsmp


Below is a sample trace, they all look pretty much the same....


Any clues how to debug this ?

Thanks

-Sev


-- 


Sev Binello

Brookhaven National Laboratory

Upton, New York

631-344-5647

sev@bnl.gov


Jan 23 12:39:27 acnmcr4p kernel: RampEditor    D C02D6EB4  1288

21855      1         21857 22139 (NOTLB)

Jan 23 12:39:27 acnmcr4p kernel: f6e5ec94 00200086 65cc8b98 c02d6eb4

f56a9430 e3923830 00200200 00000000 Jan 23 12:39:27 acnmcr4p kernel:

c35c4860 00000000 c35bc780 c35bbde0 00000000 00000000 0d1d4140 001553b9

Jan 23 12:39:27 acnmcr4p kernel:e3923830 e8fd93f0 e8fd955c 00000000

00200246 65cef381 65cef381 f6e5ed04 Jan 23 12:39:27 acnmcr4p kernel:

Call Trace:

Jan 23 12:39:27 acnmcr4p kernel:  [<c02d6eb4>] common_interrupt+0x18/0x20

Jan 23 12:39:27 acnmcr4p kernel:  [<c02d4c5a>] schedule_timeout+0x139/0x154

Jan 23 12:39:27 acnmcr4p kernel:  [<c012a73a>] process_timeout+0x0/0x5

Jan 23 12:39:27 acnmcr4p kernel:  [<c02d4b17>]

io_schedule_timeout+0x26/0x30

Jan 23 12:39:27 acnmcr4p kernel:  [<c02267f8>]

blk_congestion_wait+0x64/0x78

Jan 23 12:39:27 acnmcr4p kernel:  [<c012052d>]

autoremove_wake_function+0x0/0x2d

Jan 23 12:39:27 acnmcr4p kernel:  [<c0145038>]

get_writeback_state+0x30/0x35

Jan 23 12:39:27 acnmcr4p kernel:  [<c012052d>]

autoremove_wake_function+0x0/0x2d

Jan 23 12:39:27 acnmcr4p kernel:  [<c0145291>]

balance_dirty_pages+0xbe/0x11c

Jan 23 12:39:27 acnmcr4p kernel:  [<f8f86105>]

nfs_commit_write+0x43/0x72 [nfs]

Jan 23 12:39:27 acnmcr4p kernel:  [<c0142517>]

generic_file_buffered_write+0x41f/0x501

Jan 23 12:39:27 acnmcr4p kernel: ...
[ message continues ]
[view original message]
From: Fengguang Wu <wfg@...>
To: Sev Binello <sev@...>
Cc: <linux-kernel@...>
Subject: Re: Many processes stuck in blk_congestion_wait
Date: Sunday, January 27, 2008 - 11:16 pm

It's a pretty old kernel.  If possible, a kernel upgrade may well fix

your problem.


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Previous thread: JMicron PATA 2.6.24-rc7 can't find drives by Marcin Gil on Wednesday, January 23, 2008 - 6:23 pm. (14 messages)

Next thread: [PATCH][ppc] logical/bitand typo in powerpc/boot/4xx.c by Roel Kluin on Wednesday, January 23, 2008 - 6:37 pm. (9 messages)