Public bug reported:
Summary
-------
[regression][6.17.0-29][md/raid5] Repeated crash reboots after update; one boot
captured:
kernel BUG at drivers/md/raid5.c:274
Impact
------
System is unstable/unusable on 6.17.0-29-generic (frequent crash/reboot events).
System is stable when booted into older kernel 6.17.0-23-generic.
Environment
-----------
Distro: Ubuntu 24.04.4 LTS (Noble)
Kernel bad: 6.17.0-29-generic
Kernel good: 6.17.0-23-generic (also previously stable on 6.17.0-22-generic)
CPU: AMD Ryzen 5 1600
Storage: multiple disks with md RAID5 arrays (md0 and md1), md1
reconstruction/resync active during affected boots
Regression window
-----------------
- Last known good long-running boot:
6.17.0-22-generic from 2026-05-01 08:28 EDT to 2026-05-16 10:13 EDT
- 6.17.0-29 installed via apt on:
2026-05-16 10:11 (local time)
- First bad boot:
2026-05-16 10:15 EDT on 6.17.0-29-generic
- Multiple crash-ended boots followed on 6.17.0-29-generic
- Booting 6.17.0-23-generic restored stability
Observed crash evidence
-----------------------
From journal of boot index -6 (2026-05-16 12:41:37 -> 12:41:56 EDT), kernel
6.17.0-29-generic:
May 16 12:41:56 ... ------------[ cut here ]------------
May 16 12:41:56 ... kernel BUG at drivers/md/raid5.c:274!
In same boot, md arrays were activated and md1 reconstruction started shortly
before the BUG:
- md/raid:md1: not clean -- starting background reconstruction
- md: resync of RAID array md1
Boot timeline (recent)
----------------------
-13 6.17.0-22 2026-05-01 08:28 -> 2026-05-16 10:13 (stable long run)
-12 6.17.0-29 2026-05-16 10:15 -> 11:07 (crash)
-11 6.17.0-29 2026-05-16 11:08 -> 11:09 (crash)
-10 6.17.0-29 2026-05-16 11:10 -> 11:13 (crash)
-9 6.17.0-29 2026-05-16 11:15 -> 11:45 (crash)
-8 6.17.0-29 2026-05-16 11:48 -> 12:15 (crash)
-7 6.17.0-29 2026-05-16 12:16 -> 12:40 (crash)
-6 6.17.0-29 2026-05-16 12:41 -> 12:41 (kernel BUG at
drivers/md/raid5.c:274)
-5 6.17.0-29 2026-05-16 12:43 -> 13:22 (crash)
-4 6.17.0-29 2026-05-16 13:36 -> 13:37 (crash)
-3 6.17.0-29 2026-05-16 13:49 -> 13:55 (crash)
-2 6.17.0-29 2026-05-16 14:07 -> 14:45 (crash)
-1 6.17.0-29 2026-05-16 14:58 -> 15:05 (crash)
0 6.17.0-23 2026-05-16 15:15 -> present (stable)
What I already tried
--------------------
- Selected older kernel from GRUB (6.17.0-23-generic): stable.
- Did not apply tuning/workarounds to mdadm/RAID settings yet.
Request
-------
Please triage as a regression in 6.17.0-29 affecting md/raid5 path, with BUG at
drivers/md/raid5.c:274.
If needed, I can provide additional logs for specific boot IDs and mdadm detail
output.
Comment
-------
- I did not file using 'ubuntu-bug linux' because I cannot boot with the
problematic kernel and I didn't want to submit a bug under a working kernel.
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
** Tags: kernel mdadm noble raid regression-update
** Tags added: regression-update
** Tags added: kernel mdadm noble raid
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https://bugs.launchpad.net/bugs/2152808
Title:
[regression][6.17.0-29][md/raid5] kernel BUG at drivers/md/raid5.c:274
with repeated crash reboots
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