Package: systemd Version: 215-17+deb8u2 Severity: important Hi,
On a normal shutdown or reboot, systemd disables swap before stopping any other processes. I see something like this: Nov 15 14:50:53 systemd[1]: Started Synchronise Hardware Clock to System Clock. Nov 15 14:50:53 systemd[1]: Deactivating swap /dev/disk/by-uuid/bffdb4e8-... Nov 15 14:50:53 systemd[1]: Deactivating swap /dev/disk/by-uuid/bffdb4e8-... Nov 15 14:50:53 systemd[1]: Deactivating swap /dev/disk/by-uuid/bffdb4e8-... Nov 15 14:50:53 systemd[1]: Stopping system-ifup.slice. Nov 15 14:50:53 systemd[1]: Removed slice system-ifup.slice. Nov 15 14:50:53 systemd[1]: Stopping <all other services> Which is fairly undesirable, because processes wanting to do a clean shutdown may need to allocate memory, and they are now competing for it with the thundering herd of all the processes that have just been signalled to shutdown simultaneously. I noticed this because it was in fact causing postgres to OOM on a test system as it tried to checkpoint itself while doing an orderly shutdown. I'm tempted to call this 'grave', because the potential for data loss is about the equivalent of just yanking the power cord out of the wall for every shutdown - and in the case of postgres on this system it indeed means that the WAL segment files are not properly archived before the system is shutdown - which would be real data loss if anything tried to restore from them before this system was restarted again. This really should delay disabling swap until about the last thing it does before actually halting - and it should probably only disable it once, since the repeating of that 3 times seems like a bug in its handling of this too. Cheers, Ron _______________________________________________ Pkg-systemd-maintainers mailing list Pkg-systemd-maintainers@lists.alioth.debian.org http://lists.alioth.debian.org/cgi-bin/mailman/listinfo/pkg-systemd-maintainers
