Re: NFS panic

[Sascha Wildner <saw@xxxxxxxxx>]

Matthew Dillon wrote:

> :PROBLEM 1
> :---------
> :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.


> :PROBLEM 2
> :---------
> :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
> :1023
> :
> :And then the machine just sits there.
> :
> :Sascha
>
>     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.

Sascha