Bug 34597 – User with >200 groups breaks mountd

Bug 34597 - User with >200 groups breaks mountd


Summary:	User with >200 groups breaks mountd

Status:	CLOSED FIXED

Product:	UCS
Classification:	Unclassified
Component:	NFS
Version:	UCS 3.2
Hardware:	Other Linux

Importance:	P5 normal (vote)
Target Milestone:	UCS 3.2-2-errata
Assigned To:	Philipp Hahn
QA Contact:	Stefan Gohmann

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Reported:	2014-04-17 14:30 CEST by Janis Meybohm
Modified:	2014-05-20 12:56 CEST (History)
CC List:	2 users (show)

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Description Janis Meybohm

2014-04-17 14:30:55 CEST

2014041421005147

If a user with many groups (201 in this case) tries to access a NFS mount provided by UCS, the "cd" command hangs and the corresponding nfsd kernel thread may increase the load on the server.

Servers syslog shows:
Apr 17 14:20:28 master mountd[1157]: qword_eol: fflush failed: errno 22 (Invalid argument)
Apr 17 14:22:29 master mountd[1157]: qword_eol: fflush failed: errno 22 (Invalid argument)
Apr 17 14:24:31 master mountd[1157]: qword_eol: fflush failed: errno 22 (Invalid argument)


Rebuilding the nfs-utils package including the following commit fixes this:
<http://git.linux-nfs.org/?p=steved/nfs-utils.git;a=commitdiff;h=5604b35a61e22930873ffc4e9971002f578e7978>

Comment 1 Stefan Gohmann

2014-05-13 08:12:08 CEST

We should release this update for 3.2-1-errata and 3.2-2-errata.

Comment 2 Philipp Hahn

2014-05-19 15:13:45 CEST

Patch applied:
nfs-utils/3.2-0-0-ucs/1:1.2.2-4squeeze2-errata3.2-1/10-increment-the-stdio-file-buffer-size-for-procfs-files.patch
r13099

ucs-3.2-2/doc/errata/staging/2014-05-16-nfs-utils.yaml
r50338 | Bug #34597: User with >200 groups breaks mountd

Please note: the packet was build in the older release errata3.2-*1* (to guarantee that it really works there too), but the YAML files is in the newer release ucs3.2-*2* (as a reference to future releases would look odd).

ucs-test case:
r50389 | Bug #34596, Bug #34597 test: user with many groups

Comment 3 Stefan Gohmann

2014-05-20 08:38:17 CEST

Code: OK

Tests: OK (with the updated ucs-test)

YAML: OK

Comment 4 Philipp Hahn

2014-05-20 08:40:27 CEST

(In reply to Stefan Gohmann from comment #3)
> Tests: OK (with the updated ucs-test)
r50420 | Bug #34596, Bug #34597 test: user with many groups

Comment 5 Moritz Muehlenhoff

2014-05-20 12:56:57 CEST

http://errata.univention.de/ucs/3.2/112.html