systemd-journal segfaulting with 7.3-rc1 on ppc64le

Hi,

I am using the rc kernels via
https://fedoraproject.org/wiki/RawhideKernelNodebug on my Fedora 44
Power9 based system (Talos II) and after installing
kernel-7.3.0-0.rc1.18.fc46.ppc64le my system failed to boot
successfully and I have found systemd-journal segfaults in the boot log
like this

[   12.485876] systemd-coredump[1464]: Process 1409 (systemd-journal) of user 0 terminated abnormally with signal 6/ABRT, processing...
[   12.578533] systemd-coredump[1464]: Process 1409 (systemd-journal) of user 0 dumped core.
[   12.578554] systemd-coredump[1464]: Coredump diverted to /var/lib/systemd/coredump/core.systemd-journal.0.b7f8bc16143c4cc1832aeb4c64ff16a4.1409.1788339090000000.zst
[   12.578560] systemd-coredump[1464]: Module libpcre2-8.so.0 from rpm pcre2-10.47-1.fc44.1.ppc64le
[   12.578566] systemd-coredump[1464]: Module libselinux.so.1 from rpm libselinux-3.11-1.fc44.ppc64le
[   12.578572] systemd-coredump[1464]: Module libz.so.1 from rpm zlib-ng-2.3.3-3.fc44.ppc64le
[   12.578578] systemd-coredump[1464]: Module libcrypto.so.3 from rpm openssl-3.5.8-1.fc44.ppc64le
[   12.578583] systemd-coredump[1464]: Module libcrypt.so.2 from rpm libxcrypt-4.5.2-3.fc44.ppc64le
[   12.578596] systemd-coredump[1464]: Module libsystemd-shared-259.8-1.fc44.so from rpm systemd-259.8-1.fc44.ppc64le
[   12.578602] systemd-coredump[1464]: Module systemd-journald from rpm systemd-259.8-1.fc44.ppc64le
[   12.578608] systemd-coredump[1464]: Stack trace of thread 1409:
[   12.578613] systemd-coredump[1464]: #0  0x00007fffaa82ae74 abort (libc.so.6 + 0x2ae74)
[   12.578619] systemd-coredump[1464]: #1  0x00007fffaa8a4e60 __libc_message_impl (libc.so.6 + 0xa4e60)
[   12.578624] systemd-coredump[1464]: #2  0x00007fffaa8a4eec __libc_fatal (libc.so.6 + 0xa4eec)
[   12.578630] systemd-coredump[1464]: #3  0x00007fffaa8b54bc start_thread (libc.so.6 + 0xb54bc)
[   12.578635] systemd-coredump[1464]: #4  0x00007fffaa9613e8 __clone (libc.so.6 + 0x1613e8)
[   12.578641] systemd-coredump[1464]: #5  0x00007fffaa9613e8 __clone (libc.so.6 + 0x1613e8)
[   12.578646] systemd-coredump[1464]: #6  0x00007fffaa8b4e40 create_thread.constprop.0 (libc.so.6 + 0xb4e40)
[   12.578652] systemd-coredump[1464]: #7  0x00007fffe66094a0 n/a (n/a + 0x0)
[   12.578657] systemd-coredump[1464]: ELF object binary architecture: PowerPC64
[   12.646917] systemd[1]: systemd-journald.service: Scheduled restart job, restart counter is at 2.

I have reproduced the behaviour with the latest mainline kernel and my
bisecting points to
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=3424d8c18a7da1010d03391a22e728b857d0d5c5
(which is not that helpful as it is a merge commit). There are also
messages about "dbus-broker.service: Failed with result 'exit-code'",
so the journal crash might be a symptom of another root cause. Using
the Fedora prebuilt kernels
- kernel-7.3.0-0.rc0.260818g0f23d56f17fd.3.fc46.ppc64le  = OK
- kernel-7.3.0-0.rc0.260819gbd5f485f3f02.5.fc46.ppc64le  = BAD
doesn't help much in narrowing as it is when the big merges happened.

---
git bisect start
# status: waiting for both 'good' and 'bad' commits
# good: [8d3ae59288f1e7d58d76558a6ee96d533bc5019f] Linux 7.2
git bisect good 8d3ae59288f1e7d58d76558a6ee96d533bc5019f
# status: waiting for 'bad' commit, 1 'good' commit known
# bad: [cee9395acd8043be0644b25c34bfa86623f2b935] Linux 7.3-rc1
git bisect bad cee9395acd8043be0644b25c34bfa86623f2b935
# bad: [55ab7e14222e5f0b0fd9f7711ca391d2924b35e3] Merge tag 'for-7.3/block-20260819' of git://git.kernel.org/pub/scm/linux/kernel/git/axboe/linux
git bisect bad 55ab7e14222e5f0b0fd9f7711ca391d2924b35e3
# bad: [e5c91aac491def6ab3f90c4cc246e3fcb0f8f058] Merge tag 'sound-7.3-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound
git bisect bad e5c91aac491def6ab3f90c4cc246e3fcb0f8f058
# bad: [cbe8aadf1551f3f4a853f24b3b96d9f0eea49c53] Merge tag 'soc-dt-7.3' of git://git.kernel.org/pub/scm/linux/kernel/git/soc/soc
git bisect bad cbe8aadf1551f3f4a853f24b3b96d9f0eea49c53
# bad: [762fffa407d8d24288513538cf5d17c2c5425258] Merge tag 'irq-core-2026-08-17' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
git bisect bad 762fffa407d8d24288513538cf5d17c2c5425258
# good: [a5778046a02570fd23bdf0b48dce330237d1996c] Merge tag 'pm-7.3-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm
git bisect good a5778046a02570fd23bdf0b48dce330237d1996c
# good: [85cdaca6970028bf6f544c355c90035586836ddf] Merge tag 'arm64-upstream' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux
git bisect good 85cdaca6970028bf6f544c355c90035586836ddf
# good: [8915457146a11d20a6c0786396376afda65eec40] Merge tag 'perf-core-2026-08-17' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
git bisect good 8915457146a11d20a6c0786396376afda65eec40
# good: [e2457a664ea02c414c6b9828bff3a0df4c300f63] Merge tag 'sched-core-2026-08-17' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
git bisect good e2457a664ea02c414c6b9828bff3a0df4c300f63
# good: [3a0dd7ba4f44cdc116d83712f61e7c1a95be3588] Merge tag 'x86-documentation-2026-08-17' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
git bisect good 3a0dd7ba4f44cdc116d83712f61e7c1a95be3588
# good: [fb419d53f2619e29bf4f96613d9a614e1c263736] x86/entry: Simplify the syscall number logic
git bisect good fb419d53f2619e29bf4f96613d9a614e1c263736
# bad: [6138016752322261e26ac88eaeb64c0c890f98a2] Merge tag 'core-rseq-2026-08-17' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
git bisect bad 6138016752322261e26ac88eaeb64c0c890f98a2
# good: [71ff30013f19ca46c2c72c25731c32b6cc7b5620] entry: Make return type of syscall_trace_enter() bool
git bisect good 71ff30013f19ca46c2c72c25731c32b6cc7b5620
# good: [2a98ffac7733e77a178af7240f9fa9392ca45aad] selftests/rseq: Add missing test binaries to .gitignore
git bisect good 2a98ffac7733e77a178af7240f9fa9392ca45aad
# bad: [3424d8c18a7da1010d03391a22e728b857d0d5c5] Merge tag 'core-entry-2026-08-17' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
git bisect bad 3424d8c18a7da1010d03391a22e728b857d0d5c5
# good: [05c033db7e9ad3c34f6968ec568cb6ee01051c57] entry, treewide: Make syscall_enter_from_user_mode[_work]() indicate syscall execution
git bisect good 05c033db7e9ad3c34f6968ec568cb6ee01051c57
# first 'bad' commit: [3424d8c18a7da1010d03391a22e728b857d0d5c5] Merge tag 'core-entry-2026-08-17' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
---

Also can be reproduced by using the recent Fedora Rawhide installers
which won't initialize properly.


	Thanks,

		Dan