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From: bugzilla-daemon@bugzilla.kernel.org
To: linuxppc-dev@lists.ozlabs.org
Subject: [Bug 207359] MegaRAID SAS 9361 controller hang/reset
Date: Thu, 06 Aug 2020 17:56:24 +0000
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Message-ID: <bug-207359-206035-ByFbM86V88@https.bugzilla.kernel.org/>
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https://bugzilla.kernel.org/show_bug.cgi?id=3D207359

--- Comment #4 from Cameron (cam@neo-zeon.de) ---
I converted the box's filesystems from BTRFS to XFS, and switched the page =
size
from 4k to 64k. The problem appears to be entirely gone now. I am able to
conclusively run 5.7.13 without issue, which I verified as having the
megaraid_sas controller hang problem while still running my previous BTRFS+=
4k
page configuration.

Unfortunately, it took a great deal of time to perform this conversion, and=
 I
wasn't able to keep the box down even longer to test if converting to XFS a=
nd
64k pages individually resolved the issue. All I can say for certain is that
either switching to XFS, to a 64k page size, or both has fixed the problem =
for
me.

The backup volume is a single SATA disk that is still using BTRFS (for
snapshotting), and is not giving me any trouble. But if this has any relati=
on
to https://bugzilla.kernel.org/show_bug.cgi?id=3D206123, then this may not =
be
conclusive due to being that SATA disks potentially may not trigger the iss=
ue.
The single disk also can't push as much IO as the RAID10 volume so that may=
 be
another reason.

My quasi educated non-kernel-dev guess is that this is probably a bug relat=
ing
to the 4k page size. Whether or not the regular behavior of BTRFS exacerbat=
es
this (making it easier to reproduce), is possible, but unknown.

Hopefully someone else encountering this issue will find this helpful.

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