Re: Fatal double fault in ZFS with yesterday's CURRENT
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"Steven Hartland" <killing@multiplay.co.uk> wrote:
> From: "Fabian Keil" <freebsd-listen@fabiankeil.de>
>=20
> > After updating my laptop to yesterday's CURRENT (r265216),
> > I got the following fatal double fault on boot:
> > http://www.fabiankeil.de/bilder/freebsd/kernel-panic-r265216/
> >=20
> > My previous kernel was based on r264721.
> >
> > I'm using a couple of custom patches, some of them are ZFS-related
> > and thus may be part of the problem (but worked fine for months).
> > I'll try to reproduce the panic without the patches tomorrow.
> >
>=20
> Your seeing a stack overflow in the new ZFS queuing code, which I
> believe is being triggered by lack of support for TRIM in one of
> your devices, something Xin reported to me yesterday.
>=20
> I commited a fix for failing TRIM requests processing slowly last
> night so you could try updating to after r265253 and see if that
> helps.
Thanks. The hard disk is indeed unlikely to support TRIM requests,
but I can still reproduce the problem with a kernel based on r265255.
> I still need to investigate the stack overflow more directly which
> appears to be caused by the new zfs queuing code when things are
> running slowly and there's a large backlog of IO's.
>
> I would be interested to know you config there so zpool layout and
> hardware in the mean time.
The system is a Lenovo ThinkPad R500:
http://www.nycbug.org/index.cgi?action=3Ddmesgd&do=3Dview&dmesgid=3D2449
I'm booting from UFS, the panic occurs while the pool is being imported.
The pool is located on a single geli-encrypted slice:
fk@r500 ~ $zpool status tank
pool: tank
state: ONLINE
scan: scrub repaired 0 in 4h11m with 0 errors on Sat Mar 22 18:25:01 2014
config:
NAME STATE READ WRITE CKSUM
tank ONLINE 0 0 0
ada0s1d.eli ONLINE 0 0 0
errors: No known data errors
Maybe geli fails TRIM requests differently.
Fabian
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