ZFS import panic (kgdb backtrace attached)

[Steven Hartland]

Can't say for sure, usually its a double fault panic for
stack issue, but worth eliminating as an initial step.

I would also consider moving to 10 from 8.4 tbh.

    Regards
    Steve

----- Original Message ----- 
From: "grarpamp" <grarpamp at gmail.com>
To: <freebsd-fs at freebsd.org>
Sent: Monday, June 09, 2014 9:15 PM
Subject: Re: ZFS import panic (kgdb backtrace attached)


> On Mon, Jun 9, 2014 at 3:01 PM, Steven Hartland wrote:
>> ZFS doesn't really like i386 due to the limited stack size
>>
>> So the first think I would try is increasing your kernel stack size:
>> options KSTACK_PAGES=4
> 
> If it's not a genuine bug (ie: just the usual ZFS on i386 issues),
> I can move it to default x64 with 8GB in maybe a week.
> 
> I forgot to include, this is stock GENERIC with:
> real memory  = 2147483648 (2048 MB)
> vm.kmem_size=650000000
> 
> I don't recall why I set kmem_size. And when wired
> mem gets above 600 things get unrecoverably slow and
> the box will lock/panic if I press on zfs at/above 600.
> With the 100 or so heavy write panics and a dozen+
> power cuts across multiple zfs/pool/bsd versions, I'm
> amazed I still have any readable zfs fs's at all.
> 
> Anyway, posted in case it's a genuine bug.
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