flock LOCK_EX hangs
Subsystems (2)
Hello all,
I'm experiencing problems with the kernel NFS server. The client hangs on the flock call. This is Debian etch, Linux 2.6.16-1-686-smp, the server and the client is the same machine. The directory is exported with rw, no mount options. The lockd kernel thread is present, rpcinfo -p reports nlockmgr registered, the firewall passes all the traffic through.
I've googled and searched the list archive, the postings are usually quite old (only two were from 2006 and referred to Linux 2.6), and I couldn't see how I could further analyze the problem. I've also tried mounting with nolock, but this apparently makes flock / fcntl to fail, since the tools I use (automake and debootstrap, although I checked this only with the latter) exited with an error code, and I rely upon it.
How can I fix the problem?
Thanks in advance,
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Baurzhan Ismagulov http://www.kz-easy.com/ ------------------------------------------------------------------------- This SF.net email is sponsored by DB2 Express Download DB2 Express C - the FREE version of DB2 express and take control of your XML. No limits. Just data. Click to get it now. http://sourceforge.net/powerbar/db2/ _______________________________________________ NFS maillist - [email protected] https://lists.sourceforge.net/lists/listinfo/nfs
Quoted 7 lines · Baurzhan Ismagulov
I'm experiencing problems with the kernel NFS server. The client hangs on the flock call. This is Debian etch, Linux 2.6.16-1-686-smp, the server and the client is the same machine. The directory is exported with rw, no mount options. The lockd kernel thread is present, rpcinfo -p reports nlockmgr registered, the firewall passes all the traffic through.
Quoted 6 lines
I've googled and searched the list archive, the postings are usually quite old (only two were from 2006 and referred to Linux 2.6), and I couldn't see how I could further analyze the problem. I've also tried mounting with nolock, but this apparently makes flock / fcntl to fail, since the tools I use (automake and debootstrap, although I checked this only with the latter) exited with an error code, and I rely upon it.
Might be fun to watch the network traffic as this is happening. I'd probably do something like
wireshark -Slk -ilo
then try to get a lock, and try to understand what's happening on the "network": is the client sending requests that the server doesn't answer? Or are there errors coming back? Etc.
Or you could run
tcpdump -s0 -ilo -wtmp.pcap
and mail a copy of tmp.pcap and somebody could take a look.
There's also been a lot fixed since 2.6.16, so it might be worth trying something newer.
--b.
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Hello Bruce,
Quoted 1 line · J. Bruce Fields
Might be fun to watch the network traffic as this is happening.
Eh, I've hoped someone would have a silver bullet for me, so that I don't have to do that :) .
There is one LOCK request and one LOCK reply with the NLM DENIED GRACE PERIOD error. Does this say anything?
This is still under 2.6.16, I'm planning to upgrade on Friday, unless the problem can be solved with the current version. Besides, is it possible to turn on logging? Also, I've seen the following messages in the kernel log: "do_vfs_lock: VFS is out of sync with lock manager!" This happened only when I dumped the traffic the last time, not within the day, when I tried many times (the logs were not rotated).
Any ideas?
With kind regards,
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Baurzhan Ismagulov http://www.kz-easy.com/
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Hello Bruce,
Quoted 2 lines · J. Bruce Fields
Quoted 2 lines
I'm experiencing problems with the kernel NFS server. The client hangs on the flock call.
...
Quoted 2 lines
There's also been a lot fixed since 2.6.16, so it might be worth trying something newer.
I've tried 2.6.20, and it worked. It's amazing how long time it has been since I had kernel bugs, I haven't even thought in that direction. Thanks much!
With kind regards,
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Baurzhan Ismagulov http://www.kz-easy.com/ ------------------------------------------------------------------------- This SF.net email is sponsored by DB2 Express Download DB2 Express C - the FREE version of DB2 express and take control of your XML. No limits. Just data. Click to get it now. http://sourceforge.net/powerbar/db2/ _______________________________________________ NFS maillist - [email protected] https://lists.sourceforge.net/lists/listinfo/nfs