[systemd-devel] stdout logging to journal doesn't survive journal restart

[Colin Guthrie]

'Twas brillig, and Dave Reisner at 18/10/12 08:32 did gyre and gimble:
> Hey,
> 
> I'm noticing that if you ever have to restart the journal, services
> which log to /run/systemd/journal/stdout lose their connection. You can
> reproduce this systemd-cat pretty easily:
> 
>   ( {
>     echo "this is logged"
>     echo "sleep 5 seconds..." >&2
>     sleep 5
>     echo "done sleeping...." >&2
>     echo "this is never logged!"
>   } |& systemd-cat ) &
> 
>   sleep 2
>   systemctl restart systemd-journald
>   wait
> 
> Of course, restarting the service will solve this, but it seems a bit
> uncool...
> 
> I strongly suspect that its related that connections to the socket are
> dup'd for every service, i.e.
> 
> $ grep -F /run/systemd/journal/stdout /proc/net/unix
> ffff88032d5e8680: 00000002 00000000 00010000 0001 01   136 /run/systemd/journal/stdout
> ffff88032cdce800: 00000003 00000000 00000000 0001 03  3369 /run/systemd/journal/stdout
> ffff88032d477500: 00000003 00000000 00000000 0001 03  3364 /run/systemd/journal/stdout
> ffff88032d477b80: 00000003 00000000 00000000 0001 03  3366 /run/systemd/journal/stdout
> ffff88032d6b9d40: 00000003 00000000 00000000 0001 03  8686 /run/systemd/journal/stdout
> ffff88032cdcd7c0: 00000003 00000000 00000000 0001 03  7467 /run/systemd/journal/stdout
> ffff88032d470680: 00000003 00000000 00000000 0001 03 2136114 /run/systemd/journal/stdout
> ffff88032d6bb400: 00000003 00000000 00000000 0001 03 10570 /run/systemd/journal/stdout
> 
> This doesn't affect processes which connect to /run/systemd/journal/socket
> via the various API, and only a single instance of this socket ever
> appears in /proc/net/unix.
> 
> Any ideas?

This was discussed on IRC a couple days ago.

I paraphrased Lennart's reply there in this bug report (see my last
comment):

https://bugs.freedesktop.org/show_bug.cgi?id=56043


Col

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Colin Guthrie
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