linux-ext4 - [Bug 217965] ext4(?) regression since 6.5.0 on sata hdd

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Message-ID: <bug-217965-13602-Wz4LIANCIe@https.bugzilla.kernel.org/>
Date: Fri, 29 Dec 2023 20:35:19 +0000
From: bugzilla-daemon@...nel.org
To: linux-ext4@...r.kernel.org
Subject: [Bug 217965] ext4(?) regression since 6.5.0 on sata hdd

https://bugzilla.kernel.org/show_bug.cgi?id=217965

Matthew Stapleton (matthew4196@...il.com) changed:

           What    |Removed                     |Added
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                 CC|                            |matthew4196@...il.com

--- Comment #52 from Matthew Stapleton (matthew4196@...il.com) ---
I'm a bit late to reporting this, but it might be related to this bug report.

Since noticing this 100% cpu flush problem on my computer with a non-raid
Samsung SSD 990 PRO NMVe and kernel 6.6.3 (and now 6.6.8) I decided to do a git
bisect and seemed to track down the problem to commit:
7e170922f06bf46effa7c57f6035fc463d6edc7e if that helps, although I haven't
tested if disabling CR1_5 also resolves the problem.  Running "tar xf
linux-6.6.8.tar.xz" is enough to trigger 100% cpu for a few seconds after tar
is finished on my system, although it doesn't noticeably trigger the problem on
my server with raid 6 and hard drives.  It also looks like my ext4 filesystem
is mounting with stripe=32733 according to /proc/mounts, although dumpe2fs -h
doesn't show any stripe settings on the filesystem.

I'll try the patch and see if it fixes the problem.

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