To conclude this:
For SLES15.4-s390x, the newly released patch SUSE-SLE-Module-Basesystem-15-SP4-2023-41 corrects the
kdump problem.
I think kdump has been broken all the time in SLES15.4 (and probably for all SLES15.x releases, but
I’m not sure).
And seems like the story continues: we are still running some supported SLES12.5 servers, and in
them, kdump seems to fail similarly (cannot find/mount the root disk).
--
Best regards,
Juha Vuori
On 16.9.2022 4.27, Juha Vuori wrote:
Hi,
I haven't witnessed any kernel panic since the 00s (kudos to devs!).
Since then, kdump has become the primary tool for collecting evidence of those
events.
So I thought I need to test how kdumping works in the current SLES15.4 images.
echo c > /proc/sysrq-trigger
It fails. The kdump kernel boot ends up in "dracut-initqueue loop" trying to
get disk devs online:
...
systemd[1]: Reached target Basic System.
kernel: EXT4-fs (dm-0): mounted filesystem with ordered data mode. Opts:
acl,user_xattr. Quota mode:
none.
dracut-initqueue[401]: Warning: dracut-initqueue: timeout, still waiting for following initqueue
hooks:
dracut-initqueue[401]: Warning:
/lib/dracut/hooks/initqueue/finished/devexists-\x2fdev\x2fdisk\x2fby-path\x2fccw-0.0.0300-part1.sh:
"[ -e "/dev/disk/by-path/ccw-0.0.0300-part1" ]"
dracut-initqueue[401]: Warning:
/lib/dracut/hooks/initqueue/finished/devexists-\x2fdev\x2fmapper\x2fsystem-root.sh:
"[ -e
"/dev/mapper/system-root" ]"
dracut-initqueue[401]: Warning:
/lib/dracut/hooks/initqueue/finished/devexists-\x2fdev\x2fsystem\x2froot.sh: "[ -e
"/dev/system/root" ]"
dracut-initqueue[401]: Warning: /lib/dracut/hooks/initqueue/finished/wait-kdump0.sh:
"[ -f
/tmp/net.kdump0.did-setup ]"
dracut-initqueue[401]: Warning: dracut-initqueue: starting timeout scripts
...
Boot ends up in emergency shell, and no dump is stored, naturally.
Somehow this looks similar to normal kernel boot problems there were too many
in a period with some
SLES12.x releases, when dracut was quite recently introduced. But I'm not sure
if the problems are
of the same root.
We have a case open with SUSE support, but I thought I'd ask if anybody has
been playing with
kdumping lately.. (hopefully not in real case incidents, though).
--
Best regards,
Juha Vuori
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