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Created attachment 1204044[details]
systemd-journald start failure
Description of problem:
If journald is interrupted during journal rotation during boot, it can leave a corrupted journal preventing systemd-journald from further launching. More particular, we can see that in the running system journald fails to start because the current journal, /run/log/journal/.../system.journal is corrupt: it has size=0 in its header.
This seems to be due to the fact that there are a lot of log messages during the initial boot phase, and the initial journald instance decided that it needs to do log rotation, but was interrupted while doing so:
[ 14.301981] systemd[1]: systemd-journald.service changed dead -> running
[ 14.632710] systemd-journald[98]: Data hash table of /run/log/journal/78458568871841dfb74e3f29f463788c/system.journal has a fill level at 75.0 (15703 of 20935 items, 12058624 file size, 767 bytes per hash table item), suggesting rotation.
[ 14.638730] systemd-journald[98]: /run/log/journal/78458568871841dfb74e3f29f463788c/system.journal: Journal header limits reached or header out-of-date, rotating.
[ 14.642956] systemd-journald[98]: Rotating...
[ 14.648489] systemd-journald[98]: Failed to create new runtime journal: Interrupted system call
[ 14.651202] systemd-journald[98]: Vacuuming...
[ 14.652769] systemd-journald[98]: Received SIGTERM from PID 1 (n/a).
[ 14.654517] systemd-journald[98]: systemd-journald stopped as pid 98
I'm not certain what stopped it, I guess that was normal and would cause no problem if there was no rotation.
However no new instances of the journal could start after that (see attachment for log).
Version-Release number of selected component (if applicable):
systemd-219-19.el7
How reproducible:
Rarely. One should produce a huge number of messages during boot but even in this case journald fails occasionally.
Steps to Reproduce:
1. Setup a system to send a lot of messages to journal during boot
2. Reboot OS
3.
Actual results:
systemd-journald service is dead after boot
Expected results:
systemd-journald service is running after boot
Additional info:
There is an upstream fix (https://github.com/systemd/systemd/pull/695) for "journals that only contain a valid header, but nothing else". Not sure if this is our case...
Before we start debugging would you will be willing to try our sneak preview for systemd for 7.3? It contains tons of journal-related fixes.
https://copr.fedorainfracloud.org/coprs/lnykryn/systemd-rhel-staging/
Just please be aware that this is unofficial, unsupported, test, ... build. (Although if you find some bug there feel free to contact me).