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core/cgroup: allow to set cgroup path for frozen unit

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Otherwise, after 'systemctl daemon-reload' or 'daemon-reexec', frozen
units cannot gain cgroup paths and we cannot operate anything on them,
especially, we cannot thaw or stop them.
```
Aug 12 16:26:09 systemd[1]: wd.service: Job 1278 wd.service/stop finished, result=frozen
Aug 12 16:26:09 systemd[1]: Cannot stop frozen unit wd.service.
Aug 12 16:26:09 systemd[1]: wd.service: Cannot realize cgroup for frozen unit.
Aug 12 16:26:09 systemd[1]: Failed to realize cgroups for queued unit wd.service, ignoring: Device or resource busy
```

Follow-up for 23ac08115a.
This commit is contained in:
Yu Watanabe
2025-08-13 10:45:25 +09:00
parent c70816fd09
commit b39815ebf7
1 changed files with 0 additions and 3 deletions
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src/core/cgroup.c
-3
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@@ -2088,9 +2088,6 @@ static int unit_update_cgroup(
if (!UNIT_HAS_CGROUP_CONTEXT(u))
return 0;
if (u->freezer_state != FREEZER_RUNNING)
return log_unit_error_errno(u, SYNTHETIC_ERRNO(EBUSY), "Cannot realize cgroup for frozen unit.");
r = unit_get_cgroup_path_with_fallback(u, &cgroup);
if (r < 0)
return log_unit_error_errno(u, r, "Failed to get cgroup path: %m");