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

To: Matthew Dillon <dillon@xxxxxxxxxxxxxxxxxxxx>
From: Sascha Wildner <saw@xxxxxxxxx>
Date: Sun, 25 Dec 2005 14:40:26 +0100

Matthew Dillon wrote:

: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 :unfortunately...

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?

Yes, UFS 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.

No, that didn't help.


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