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Description of problem: I set up a small cluster of FC6 machines, with one server and 4 workstations. The server and 3 of the workstations are x86_64, one workstation is a Pentium 4. The server was configured to provide an NFS filesystem, with /etc/exports defining anonuid and anongid as 4294967294, the same as the definition of nfsnobody in /etc/passwd and /etc/group. The Pentium 4 is a sacrificial machine for doing kernel experiments. I gave one of my users sudo permissions to let him build and install kernels. When he used sudo to compile by mistake, the creation of a file owned by nfsnobody caused every single workstation to freeze up. Investigation turned up this line in /var/log/messages on the server: Jan 29 14:37:26 abbott rpc.idmapd[2758]: nfsdcb: id '-2' too big! Although "service rpcidmapd status" showed that it was still running, it was clear that idmapd wasn't functioning. Forcing it to restart got the other workstations running again. I took the advice in the URL specified in this bug report and changed nfsnobody to 65534, which has prevented the problem from recurring. However, contrary to what is said in the messages found at that URL, there are no older Unix systems in my cluster; every machine is running FC6. Version-Release number of selected component (if applicable): nfs-utils-1.0.10-5.fc6 How reproducible: Always. Steps to Reproduce: 1. Set up an NFS server. In /etc/exports, include anonuid=4294967294,anongid=4294967294. 2. Create a file in an NFS mounted directory as a user unknown to the server machine. 3. Observe that the client machines are now unable to perform operations on NFS mounted files. Actual results: The idmap service stops responding. Expected results: The idmap service should map the anonymous user/group to nfsnobody and proceed normally. Even if it issues an error, it should still proceed normally instead of ceasing to respond. Additional info:
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I think this problem still exist... changing Version to rawhide.
Changing version to '9' as part of upcoming Fedora 9 GA. More information and reason for this action is here: http://fedoraproject.org/wiki/BugZappers/HouseKeeping
I'm having no luck reproducing this with later nfs-utils like nfs-utils-1.1.3-2 and nfs-utils-1.0.9-36 Is this still happening?
I've since changed jobs, and we're not using NFS at my new place of work, so I can't even test this anymore. If you can't see it, then let's consider it fixed. Thanks for looking into it.
the bug is still there (as of RHEL 5.3 x64) Ondrej
Maybe this is relevant: http://linux-nfs.org/pipermail/nfsv4/2007-December/007321.html best regards, Hari
We've tested 2.6.18-157 with the patch from #7 applied, fixes the issue. br, Hari