Messages in this thread | | | Date | Tue, 28 Feb 2006 21:35:40 +0100 | From | Olivier Croquette <> | Subject | NFS client hangs under certain circumstances on SMP machine |
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Hi
I have already sent this message on the NFS mailing-list, but I had no reaction there. May be you kernel hackers have an idea?
I have a strange problem since a few months on some Linux clients.
I have a file server accessed through: - NFS from Linux clients (autofs, but direct mount causes same effect) - Samba from Windows clients
This works since several years like a charm, but as I said there is a strange problem that appeared recently:
I have a directory, to which I generate code from Windows (\\server\dir) I can see it under Linux (/mount/dir) where I can access (compile) the files.
However, when I regenerate the file under Windows again (ie. I overwrite the old files), and I try to compile the files again under Linux, "make" hangs simply in D state:
# ps aux | grep make user 7177 0.0 0.0 1984 760 pts/1 D+ 16:13 0:00 make -f myMakefile
The load average goes up one unit each time I reproduce this test (apparently, processes in non-interruptible state are considered as running).
From then, the following actions does NOT unblock the process: - stopping or restarting the NFS service on the server - restarting the server - restarting autofs on the client - trying to unmount the NFS mount
If I reboot the client, all goes back to normal, until I repeat the process below (ie. overwriting and compiling). Typically, "shutdown -r" does not work, I have to "reboot -f".
There is nothing interesting in /var/log on the server nor on the client.
Versions used on the server: - SuSE 9.3 - kernel-default-2.6.11.4-21.11 - nfs-utils-1.0.7-3 - samba-3.0.13-1.1 - filesystem: reiserfs
On the client: - SuSE 9.3 - kernel-smp-2.6.11.4-21.10 - nfs-utils-1.0.7-3 - mounts: automount on /mount type autofs (rw,fd=4,pgrp=6529,minproto=2,maxproto=4) serv:/dir on /mount/dir type nfs (rw,addr=*IP*) - CPU: P4 with hyper threading (2 virtual CPUs) Note: maxcpus=0 does not make any difference regarding this issue. I could not test yet with kernel compiled without SMP at all.
On the following clients with the very same server, network, and mount tables I could not reproduce the problem:
- SuSE 9.1 - kernel-default-2.6.5-7.202.7 - nfs-utils-1.0.6-103 - CPU: P4 single core
- SuSE 10.0 - Kernel: 2.6.14.3-default (from kernel.org) - nfs-utils-1.0.7-13
Any idea? Seems to me as it is related to the SMP. What do you think? How can I debug further?
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