OP: changing status to invalid.
Reason: figured out the root-cause of the crash was bad memory.
After adding: memtest=5 to the kernel boot line in /etc/default/grub:
GRUB_CMDLINE_LINUX_DEFAULT="memtest=5 loglevel=5"
+ update-grub
The early-boot memtest consistently finds 22 bad memory locations and
reserves them so they can't be used.
No crashes since adding the early memtest. It adds about 1 minute to
boot time but makes the system completely stable.
What is still sad is that the crashes due to bad memory started
appearing the same day I upgraded from 20.04 to 24.04 (newer kernel and
systemd configs) after years of stability. The upgraded system had a
much more aggressive power-saving configuration in
(/etc/systemd/sleep.conf all 4 suspend/hibernate parameters were set to
'yes'). The extreme temperature changes between a deep sleep system
(cold room temperature), and active system (~60C) on a fanless system,
is what almost certainly caused the memory modules to expand/contract
frequently and start failing immediately after the upgrade.
Hope this information about a danger in upgrading from 20.04 to 24.04,
is useful to others.
Sorry for the distraction.
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https://bugs.launchpad.net/bugs/2133654
Title:
kernel 6.x: General Protection Fault (GPF) in ext4: umount,
dentry_unlink_inode
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