Bug 9400 - nfsd gets stuck when underlying filesystem is XFS
Summary: nfsd gets stuck when underlying filesystem is XFS
Alias: None
Product: File System
Classification: Unclassified
Component: XFS (show other bugs)
Hardware: All Linux
: P1 normal
Assignee: XFS Guru
: 9369 9377 (view as bug list)
Depends on:
Blocks: 9243
  Show dependency tree
Reported: 2007-11-18 06:21 UTC by Christian Kujau
Modified: 2007-12-10 12:44 UTC (History)
4 users (show)

See Also:
Kernel Version: 2.6.24-rc2
Regression: Yes
Bisected commit-id:


Description Christian Kujau 2007-11-18 06:21:15 UTC
Most recent kernel where this bug did not occur:
Distribution: Debian/unstable, i386
Hardware Environment: AMD 2600+, 2GB RAM, see http://nerdbynature.de/bits/2.6.24-rc2/nfsd/dmesg.2.gz
Software Environment: nfs-kernel-server 1.1.1-8
Problem Description:

Exported NFS shares can be mounted (client: 2.6-git/powerpc32,                         
nfs-common-1.1.1~git-20070709-3ubuntu1), but running "ls /mountpoint" (even without "-l") on the client is enough to get the [nfsd] processes in "D" state.
Doing this again will put more [nfsd] processes in  "D" state and the loadavg is incremented +1.                                                                                                   Restarting the rpc.nfsd process on the does not help much, the new rpc.nfsd processes get stuck quickly.

This has been reported by Chris Wedgwood too:

More details: http://www.nerdbynature.de/bits/2.6.24-rc2/nfsd/

Steps to reproduce:

  * mount -o vers=2            (tested, works)
  * mount -o vers=3,nordirplus
  * set CONFIG_NFSD to "depends on !XFS && ..."
Comment 1 Rafael J. Wysocki 2007-11-18 06:49:33 UTC
*** Bug 9377 has been marked as a duplicate of this bug. ***
Comment 2 Rafael J. Wysocki 2007-11-18 06:50:02 UTC
*** Bug 9369 has been marked as a duplicate of this bug. ***
Comment 3 bfields 2007-11-18 11:37:59 UTC
This is clearly a regression.  (But I don't seem to have the rights to change it.)
Comment 4 Rafael J. Wysocki 2007-11-28 16:00:37 UTC
Patch is available: http://lkml.org/lkml/2007/11/25/39
Comment 5 Ingo Molnar 2007-12-04 03:42:23 UTC
fix is still not in 2.6.24-rc4, due to undergoing more QA:

Comment 6 Ingo Molnar 2007-12-10 12:44:37 UTC
resolved by:

 commit e89bc612d61edbcefaeb6f2244f86c0f3ec89d23
 Author: Christoph Hellwig <hch@infradead.org>
 Date:   Fri Dec 7 14:07:53 2007 +1100

     [XFS] revert to double-buffering readdir

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