I've been trying to find the cause of a 'transaction is destructive' error from systemd. I'm testing systemd-219-67.el7_7.4 with the following patch applied:
https://github.com/systemd/systemd/commit/cf99f8eacf1c864b19a6a02edea78c43f3185cb7 One of the error messages I've been trying to explain is reported like this: 2020-04-22T00:45:47.047710-04:00 jupiter systemd[1]: Requested transaction contradicts existing jobs: Transaction for session-752473.scope/start is destructive (user-16027.slice has 'stop' job queued, but 'start' is included in transaction). 2020-04-22T00:45:47.047985-04:00 jupiter systemd[1]: Removed slice User Slice of userlp. 2020-04-22T00:45:47.048159-04:00 jupiter systemd-logind[1402]: Failed to start session scope session-752473.scope: Transaction for session-752473.scope/start is destructive (user-16027.slice has 'stop' job queued, but 'start' is included in transaction). This also coincides with a message from sshd: 2020-04-22T00:45:47.049949-04:00 jupiter sshd[20984]: pam_unix(sshd:session): session opened for user userlp by (uid=0) 2020-04-22T00:45:51.181665-04:00 jupiter sshd[20984]: pam_unix(sshd:session): session closed for user userlp I'm not sure where to begin to troubleshoot the problem. The systemd error is occurring sporadically and I haven't yet found a way to reproduce it. I also can't say I actually understand the error message or what I'm supposed to do about it. How is it even possible for stop and start jobs to clash like this? If someone could please provide a little guidance here, your help will be much appreciated. Thanks in advance! Mark
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