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DragonFly bugs List (threaded) for 2005-12
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Re: NFS panic

From: Matthew Dillon <dillon@xxxxxxxxxxxxxxxxxxxx>
Date: Sat, 24 Dec 2005 21:54:39 -0800 (PST)

:I'm having actually two problems. All machines involved are running 
:When I set nfs_server_enable to "yes" on one of my test machines and 
:export a few directories (which reside on FAT32 partitions) I get 
:reproducable panics on that machine as soon as I try to write from 
:another machine. Reading seems to work.
:I've taken the following picture: http://yoyodyne.ath.cx/tmp/LPIC0019.JPG
:The top line reads: "panic: lockmgr: locking against myself"
:I would have liked to provide a crash dump and everything but 

    The problem is virtually guarenteed to be msdosfs not playing nice
    with the NFS server.  Probably a bug in the msdosfs lookup code not
    releasing a vnode lock that it should be releasing.  I will try to 
    recreate it after christmas.

    I'm assuming that an NFS export of a UFS filesystem works fine?

:For some strange reason I can't produce crash dumps on that box.
:Here's what happens:
:db> call dumpsys
:dumping to dev #ad/0x20041, offset 2097536
:dump ata4: resetting devices .. done
:And then the machine just sits there.

    Don't know about that one.  hmm.  Maybe its deadlocked on a vnode,
    try setting sysctl kern.sync_on_panic to 0.

					Matthew Dillon 

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