Red Hat Bugzilla – Bug 74087
(FS NFS QUOTA)System hangs with dqputduplicate() error
Last modified: 2008-08-01 12:22:52 EDT
From Bugzilla Helper: User-Agent: Mozilla/5.0 Galeon/1.2.6 (X11; Linux i686; U;) Gecko/20020827 Description of problem: We've experienced system hangs (box responds to pings but not to logins or anything that requires filesystem access) on a production nfs server on three occasions since the middle of June. On each of the three occasions, the problem seems to have been triggered when there is heavy disk access, such as during the nightly crond runs. At the time in June, the server was running the 2.4.18-4 kernel. Right now and at the time of the last two hangs, it was using the 2.4.18-10 kernel, so we've also experienced this problem with errata kernels. Whenever the system hangs this way, it displays this information on VT0: VFS: dqputduplicate(): Duplicated dquot put without duplicate reference. The only way to get the system back to a working state at this point is through a hard reset (the machine does not respond to a three finger salute). Version-Release number of selected component (if applicable): How reproducible: Didn't try Steps to Reproduce: Don't know how to reproduce it. User and group quota over nfs should probably be enabled though to be able to reproduce this, as well as heavy load. We've only used Red Hat Linux 7.3 machines as nfs clients. Additional info: The hard drive used in the server is an IBM DeskStar 60GXP 7200rpm 61.5 GB.
Created attachment 76208 [details] Contents of /proc/cpuinfo
Created attachment 76209 [details] Output of /sbin/lspci
Created attachment 76210 [details] Output of /sbin/lspci -n
Created attachment 76211 [details] Contents of /etc/fstab
I think aranging a serial console and hitting <alt><sysrq>T when the box hangs may be helpful.
It seems we have the same problems here. We're running 7.3 with the latest patches on a Compaq Proliant ML370. Also we experience hangs, and have quite frequently quota messages: VFS: dqputduplicate(): Duplicated dquot put without duplicate reference. VFS: Adding dquot with dq_count 9 to dispose list. Also, from time to time commands like 'quotaoff -avug' seems to hang in an uninterruptable state: USER PID %CPU %MEM VSZ RSS TTY STAT START TIME COMMAND root 16900 0.0 0.1 1668 608 pts/1 D 11:59 0:00 quotaoff -avug
Can this be reproduced on a current kernel?
Thanks for the bug report. However, Red Hat no longer maintains this version of the product. Please upgrade to the latest version and open a new bug if the problem persists. The Fedora Legacy project (http://fedoralegacy.org/) maintains some older releases, and if you believe this bug is interesting to them, please report the problem in the bug tracker at: http://bugzilla.fedora.us/