On Thu, May 08, 2008 at 07:18:16PM -0300, Christian Robottom Reis wrote: > Today, apparently at random, we had a locking problem on our LAN. Client > applications hung, restarting them led to hangs, and the client dmesgs > showed a familiar: > > [443619.682118] lockd: server anthem not responding, still trying > > So the server lockd apparently stopped responding to clients, and > restarting clients got us nowhere. Eventually we cycled the server and > everything's back to normal, but I'm pretty confused as to what > happened. I couldn't scrape any evidence on the server that would point > to why this happened -- no OOPS, error or even warning output. > > I was reading through the thread at > http://groups.google.com.br/group/fa.linux.kernel/browse_thread/thread/6c7b5e49a46aef75/91adbb9f298db509?lnk=st&q=nfs+locking+server#91adbb9f298db509 > and figured that it might be a similar problem I'm facing, but I'm not > entirely sure as it's hard to say if somebody interrupted a client > program or not (it's a large diskless network). I don't think the server stopped responding to clients in the case Miklos described. Perhaps a sysrq-T dump of lockd would show where (and whether) it's blocked? (So once lockd stops responding, log into the server, run "echo t >/proc/sysrq-trigger", and collect the output from the logs, especially the stacktrace for the lockd process). > > Clients run 2.6.24-16-generic (stock Ubuntu Hardy) and server is > 2.6.22-14-generic (stock Ubuntu Gutsy). > > If the problem happens again, what can I do on server and client to > further debug the problem? And is there a utility that clears locks that > we could use to avoid having to restart the server (acking the risks in > cleared locks)? If the server lockd has completely stopped responding to lockd requests, then the problem isn't just a stray file lock. --b. ------------------------------------------------------------------------- This SF.net email is sponsored by the 2008 JavaOne(SM) Conference Don't miss this year's exciting event. There's still time to save $100. Use priority code J8TL2D2. http://ad.doubleclick.net/clk;198757673;13503038;p?http://java.sun.com/javaone _______________________________________________ NFS maillist - NFS@xxxxxxxxxxxxxxxxxxxxx https://lists.sourceforge.net/lists/listinfo/nfs _______________________________________________ Please note that nfs@xxxxxxxxxxxxxxxxxxxxx is being discontinued. Please subscribe to linux-nfs@xxxxxxxxxxxxxxx instead. http://vger.kernel.org/vger-lists.html#linux-nfs -- To unsubscribe from this list: send the line "unsubscribe linux-nfs" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
