kern/130330: [mpt] [panic] Panic and reboot machine MPT ...

[Attilio Rao]

2009/5/21 Riccardo Torrini <riccardo.torrini at esaote.com>:
> On Wed, May 20, 2009 at 10:21:23AM -0400, John Baldwin wrote:
>
>> Try this.  It reverts the single-CCB part of the previous
>> commit while keeping the other fixes.  I missed that the
>> CCB might still be in flight when we schedule another rescan.
>
> Applied to mpt_raid.c,v 1.15.2.1 2008/07/28 17:05:09 jhb (it
> differ only for line position but adiacent lines are the same).
> Also redone a diff -u4 to verify, recompiled, installed, and...
>
> YOO-HOO.  Now it rebuild _without_ crashing.
>
> May 20 17:39:08 horse kernel: \
>        mpt0:vol0(mpt0:0:0): RAID-1 - Degraded
>        mpt0:vol0(mpt0:0:0): Status ( Enabled Re-Syncing )
>        mpt0:vol0(mpt0:0:0): Low Priority Re-Sync
>        mpt0:vol0(mpt0:0:0): 64461754 of 71087625 blocks remaining
>
> Let me test against a 7.2-STABLE (and even to some -CURRENT)...
>
> [some times ahead]
>
> Bad news: I removed the second disk during rebuilding and it
> still crash.  I take a screen shapshot with camera because of
> too many messages for write down by hand  :)
>
> Image, src tarball and info here (about 2.2MB):
> ftp://ftp.torrini.org/pub/FreeBSD/mpt_crash_on_rebuild/

Please try the patch here:
http://www.freebsd.org/~attilio/notify.diff

I think it is perfectly fine this approach because the devctl_notify()
also will "silently" fail if no memory is available.
Note that this is a CAM "bug" more that the driver arises.

Thanks,
Attilio


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