coredump: fixed bug - some coredump temp files could be lost

Krayushkin Konstantin · poettering · commit aae3c9a0753d · 2019-05-31T12:57:35.000+02:00
If the machine was suddenly shutted down (hard reboot for example) while
processing core dump, temp files created manually (not with a O_TEMPFILE flag)
stay in the system. After reboot systemd-coredump treat them as usual files, so
they wouldn't be rotated and shall pollute the filesystem.

Solution is to simply add those temp files to systemd-tmpfiles configs.
diff --git a/tmpfiles.d/systemd-tmp.conf b/tmpfiles.d/systemd-tmp.conf
@@ -16,3 +16,8 @@ X /var/tmp/systemd-private-%b-*/tmp
 # Remove top-level private temporary directories on each boot
 R! /tmp/systemd-private-*
 R! /var/tmp/systemd-private-*
+
+# Handle lost systemd-coredump temp files. They could be lost on old filesystems,
+# for example, after hard reboot.
+x  /var/lib/systemd/coredump/.#core*.%b*
+r! /var/lib/systemd/coredump/.#*
