Date: Wed, 12 Jan 2005 20:53:11 +0000 (GMT) From: Robert Watson <rwatson@freebsd.org> To: Daniel Eriksson <daniel_k_eriksson@telia.com> Cc: freebsd-current@freebsd.org Subject: Re: NFS problems, locking up Message-ID: <Pine.NEB.3.96L.1050112204913.51702A-100000@fledge.watson.org> In-Reply-To: <!~!UENERkVCMDkAAQACAAAAAAAAAAAAAAAAABgAAAAAAAAA0VcX9IoJqUaXPS8MjT1PdsKAAAAQAAAAjFAe51WgFU2M9FDWQ1HRRQEAAAAA@telia.com>
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On Wed, 12 Jan 2005, Daniel Eriksson wrote: > I'm still having problems with NFS locking up when moving large amounts > of data over it on 6-CURRENT from 2005.01.11.05.00.00. This problem has > persisted for a long time now, and the only thing that seems to cure it > is running the network stack with giant enabled (debug.mpsafenet=0). > > When it happens, the process doing the copying ends up in "nfsaio" state > according to ps. Any accesses to the locked mount by other processes > ends up waiting forever in state "nfs". I have multiple file systems > mounted from the same server, and only the mount where the data is being > moved locks up. The others continue to work as expected. > > Server: UP, 6-CURRENT from 2005.01.11.05.00.00, if_vr (POLLING) Client: > SMP (dual AMD MP), 6-CURRENT from 2005.01.11.05.00.00, if_em > > The machines are connected with a crossover cable. I've tried both > schedulers (4BSD and ULE) on the client, but it doesn't make any > difference (server is running 4BSD). PREEMPTION is enabled on both > server and client. ADAPTIVE_GIANT is enabled on the client. If you run with INVARIANTS and WITNESS, does anything useful get printed out? Does it make a difference if you run the client with a UP kernel? If you break to the debugger on the client and server once wedging has occurred, what does "show lockedvnods" and "show alllocks" show? Is there any chance you could attach a second NFS client to the configuration, wedge the file system from the first client, and then try the second client and see if it experiences immediate problems? Robert N M Watson
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