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Description of problem:
On a RHEL8.5 system with ostree package install, the ostree-remount.service makes the system enter Emergency target even though the service is a no-op (due to not having "ostree" on the kernel command line).
This happens when GUI related targets are re-enqueued multiple times due to failures, e.g. bluetooth.target, sound.target (in case of multiple sound cards).
The targets pull again ostree-remount.service and after 6 or 7 retries ostree-remount.service fires OnFailure which leads to entering Emergency.
Example using a QEMU/KVM reproducer where I configured 6 sound cards (2 of each kind), booted with debugging enabled:
-------- 8< ---------------- 8< ---------------- 8< ---------------- 8< --------
systemd[1]: ostree-remount.service: Installed new job ostree-remount.service/start as 148
systemd[1]: ostree-remount.service: ConditionKernelCommandLine=ostree failed.
systemd[1]: ostree-remount.service: Starting requested but condition failed. Not starting unit.
systemd[1]: ostree-remount.service: Job ostree-remount.service/start finished, result=done
systemd[1]: ostree-remount.service: Installed new job ostree-remount.service/start as 347
systemd[1]: ostree-remount.service: ConditionKernelCommandLine=ostree failed.
systemd[1]: ostree-remount.service: Starting requested but condition failed. Not starting unit.
systemd[1]: ostree-remount.service: Job ostree-remount.service/start finished, result=done
systemd[1]: ostree-remount.service: Installed new job ostree-remount.service/start as 422
systemd[1]: ostree-remount.service: ConditionKernelCommandLine=ostree failed.
systemd[1]: ostree-remount.service: Starting requested but condition failed. Not starting unit.
systemd[1]: ostree-remount.service: Job ostree-remount.service/start finished, result=done
systemd[1]: ostree-remount.service: Installed new job ostree-remount.service/start as 514
systemd[1]: ostree-remount.service: Merged into installed job ostree-remount.service/start as 514
systemd[1]: ostree-remount.service: Merged into installed job ostree-remount.service/start as 514
systemd[1]: ostree-remount.service: Merged into installed job ostree-remount.service/start as 514
systemd[1]: ostree-remount.service: ConditionKernelCommandLine=ostree failed.
systemd[1]: ostree-remount.service: Starting requested but condition failed. Not starting unit.
systemd[1]: ostree-remount.service: Job ostree-remount.service/start finished, result=done
systemd[1]: ostree-remount.service: Installed new job ostree-remount.service/start as 888
systemd[1]: ostree-remount.service: ConditionKernelCommandLine=ostree failed.
systemd[1]: ostree-remount.service: Starting requested but condition failed. Not starting unit.
systemd[1]: ostree-remount.service: Job ostree-remount.service/start finished, result=done
systemd[1]: ostree-remount.service: Installed new job ostree-remount.service/start as 981
systemd[1]: ostree-remount.service: Start request repeated too quickly.
systemd[1]: ostree-remount.service: Failed with result 'start-limit-hit'.
systemd[1]: ostree-remount.service: Changed dead -> failed
systemd[1]: ostree-remount.service: Job ostree-remount.service/start finished, result=failed
systemd[1]: ostree-remount.service: Unit entered failed state.
systemd[1]: ostree-remount.service: Triggering OnFailure= dependencies.
---> HERE OnFailure triggering
systemd[1]: ostree-remount.service: Changed dead -> failed
systemd[1]: ostree-remount.service: Installed new job ostree-remount.service/start as 1228
systemd[1]: ostree-remount.service: ConditionKernelCommandLine=ostree failed.
systemd[1]: ostree-remount.service: Starting requested but condition failed. Not starting unit.
systemd[1]: ostree-remount.service: Job ostree-remount.service/start finished, result=done
-------- 8< ---------------- 8< ---------------- 8< ---------------- 8< --------
Attaching the full journal. Below is the excerpt showing the targets being re-enqueued due to sound cards initialization:
-------- 8< ---------------- 8< ---------------- 8< ---------------- 8< --------
Mar 25 14:29:37.718829 vm-workstation84 systemd[1]: initrd.target: Trying to enqueue job initrd.target/start/isolate
Mar 25 14:29:37.836965 vm-workstation84 systemd[1]: sys-fs-fuse-connections.mount: Trying to enqueue job sys-fs-fuse-connections.mount/start/fail
Mar 25 14:29:37.861212 vm-workstation84 systemd[1]: sys-kernel-config.mount: Trying to enqueue job sys-kernel-config.mount/start/fail
Mar 25 14:29:38.084474 vm-workstation84 systemd[1]: lvm2-pvscan@252:3.service: Trying to enqueue job lvm2-pvscan@252:3.service/start/fail
Mar 25 14:29:39.070500 vm-workstation84 systemd[1]: initrd-fs.target: Trying to enqueue job initrd-fs.target/start/replace
Mar 25 14:29:39.075523 vm-workstation84 systemd[1]: initrd-cleanup.service: Trying to enqueue job initrd-cleanup.service/start/replace
Mar 25 14:29:39.129489 vm-workstation84 systemd[1]: initrd-switch-root.target: Trying to enqueue job initrd-switch-root.target/start/isolate
Mar 25 14:29:39.684256 vm-workstation84 systemd[1]: graphical.target: Trying to enqueue job graphical.target/start/isolate
Mar 25 14:29:39.692033 vm-workstation84 systemd[1]: systemd-journald.service: Trying to enqueue job systemd-journald.service/restart/replace
Mar 25 14:29:40.016500 vm-workstation84 systemd[1]: sys-kernel-config.mount: Trying to enqueue job sys-kernel-config.mount/start/fail
Mar 25 14:29:40.020613 vm-workstation84 systemd[1]: sys-fs-fuse-connections.mount: Trying to enqueue job sys-fs-fuse-connections.mount/start/fail
Mar 25 14:29:40.075700 vm-workstation84 systemd[1]: qemu-guest-agent.service: Trying to enqueue job qemu-guest-agent.service/start/fail
Mar 25 14:29:40.085866 vm-workstation84 systemd[1]: spice-vdagentd.socket: Trying to enqueue job spice-vdagentd.socket/start/fail
Mar 25 14:29:40.143828 vm-workstation84 systemd[1]: lvm2-pvscan@252:3.service: Trying to enqueue job lvm2-pvscan@252:3.service/start/fail
Mar 25 14:29:40.440335 vm-workstation84 systemd[1]: sound.target: Trying to enqueue job sound.target/start/fail
Mar 25 14:29:40.441277 vm-workstation84 systemd[1]: sound.target: Trying to enqueue job sound.target/start/fail
Mar 25 14:29:40.442296 vm-workstation84 systemd[1]: sound.target: Trying to enqueue job sound.target/start/fail
Mar 25 14:29:40.444293 vm-workstation84 systemd[1]: sound.target: Trying to enqueue job sound.target/start/fail
Mar 25 14:29:42.370219 vm-workstation84 systemd[1]: sound.target: Trying to enqueue job sound.target/start/fail
Mar 25 14:29:42.383957 vm-workstation84 systemd[1]: sound.target: Trying to enqueue job sound.target/start/fail
-------- 8< ---------------- 8< ---------------- 8< ---------------- 8< --------
For some reason the issue doesn't happen with systemd-239-51.el8_5.3, which doesn't have the fix for BZ #2037395.
Probably with this older systemd, the rate limit was not checked at this point in the boot (0677-core-Check-unit-start-rate-limiting-earlier.patch seems to have introduced the regression).
Version-Release number of selected component (if applicable):
systemd-239-51.el8_5.5
How reproducible:
Always on my QEMU/KVM but only in full debugging mode ("systemd.log_level=debug systemd.log_target=kmsg log_buf_len=15M printk.devkmsg=on")
The reason is likely a race condition due to increased slowness.
Steps to Reproduce:
1. Install a QEMU/KVM system with Graphical User Interface
2. Add 6 sound cards (2 "ac97", 2 "ich6", 2 "ich9")
3. Configure 2 CPUs
4. Boot with "systemd.log_level=debug systemd.log_target=kmsg log_buf_len=15M printk.devkmsg=on"
Actual results:
Emergency entered
Expected results:
No failure since ostree-remount.service is a no-op so should not trigger start-limit at all
Additional info:
This happens for a real customer system having 2 sound cards, 1 bluetooth and 1 softraid.