[systemd-devel] race conditions after SIGTERM

[Reindl Harald]

Am 27.07.2014 19:53, schrieb Zbigniew Jędrzejewski-Szmek:
> On Sat, Jul 26, 2014 at 02:46:05PM +0200, Reindl Harald wrote:
>> after that happend a few minutes ago systemd on F19:
>> https://bugzilla.redhat.com/show_bug.cgi?id=1123557
>>
>> since the "sleep 1" was enough over months and now "sleep 6"
>> between "systemctl stop" and rsync is also not relieable my
>> only conclusion is that systemd don't care about the still
>> running MAINPID of "type=simple" and in case of a existing
>> "ExecStopPost" the logic is correct
> Hi,
> 
> PIDFile with Type=simple is not supported

accepted

> Adding support would be tricky, because with Type=simple there's 
> no obvious mechanism to notify systemd *when* to read the file. 
> With Type=forking, when the first process exits, systemd knows
> it can read the file. It could be done with inotify maybe

all understood

but that still don't explain why "ExecStopPost=/sur/bin/true" or
whatever "ExecStopPost" solves that and if it is not supported
why "systemctl" don't return after the one and only process
exited

the "hmm no idea what happened, try ExecStopPost=/usr/bin/sleep 1"
any so try at least give a little time masked it and in fact
was not the additional second, it's the existence

maybe somebody should explain the Fedora/RHEL maintainers
that that continued use of "mysld_safe" is nonsense since
systemd itself can do that monitoring and restarting and
systemd should warn about that unsupported combination
to force them fix it

- ExecStart=/usr/bin/mysqld_safe
+ ExecStart=/usr/libexec/mysqld --defaults-file=/etc/my.cnf






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