ZFS-NFS kernel panic under load

[Weldon S Godfrey 3]

Well, I am not sure if it was exactly that bug, since the last time I 
paniced, it never dumped to memory.  Although this time i paniced, it 
started to dump then locked up solid.

before I paniced I did get an error message at the end of the panic:


Stopped at nfsrv_access at 0x190 testb 0x1, 0xa4 (%rax)


I did hard reboot after lockup and tried savecore manually, it said it 
found no cores. (I did wait a good while and verified the drive lights was 
not running when I hard rebooted).

Although I am guessing at this point I could go back to 7.0-R for testing 
this bug since it appears to be a problem with NFS and ZFS on either v6 or 
v11 of the filesystem.

I will be happy to help debug the issue with anyone, I just need someone 
that is more knowledgeable of NFS and/or ZFS than I (which is most)

Thanks,

Weldon



If memory serves me right, sometime around Friday, Jeremy Chadwick told me:

> On Fri, Aug 22, 2008 at 12:02:47PM -0400, Weldon S Godfrey 3 wrote:
>> Ok, I tried panic, it gave a page of the typical panic page that this
>> crash generates under 7.0.  I rebooted and no core, so I am missing a
>> step.  Sorry for being clueless here.
>
> Then you're probably being bit by what's listed in the below PR.
> Supposedly you can do "panic", it should dump memory contents to swap,
> then upon rebooting go into single-user mode, "mount -a", then run
> savecore.  A real PITA, I know, but supposedly it works.
>
> I can't help with the cause of the actual panic, however; it's outside
> of my skillset.
>