> > Jan 15 00:42:42 mailrelay postfix/qmgr[5601]: 8EF0980973: > > from=<aaaaaaaa...@oconee.k12.sc.us>, size=2408, nrcpt=1 (queue > > active)^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@ > > Jan 15 09:31:40 mailrelay opendkim[668]: OpenDKIM Filter v2.11.0 starting > > (args: -x /etc/opendkim.conf) > > What you see as "^@" is how ASCII NUL (the zero byte) is displayed > by "more", "less", "vi", ... It appears that the log file has either > lots of NULs written to it, or perhaps has a "hole" as a result of > truncation of the log file while it was still being written by the > syslog daemon. Perhaps incorrect log rotation... > > As for high CPU, that's a bit hard to explain without further > information, which is difficult to obtain with a truncated log. > Postfix does not normally bring systems to their knees, its > resource limits are specifically designed to avoid that.
I've seen similar issues. Machines executing one job - which either goes hogging the CPU or using all memory, then either the OOM killer goes mad or the whole machine panics, leaving the filesystem in an inconsistent state. Often leaving zeros in the log. -- [*] sys4 AG https://sys4.de, +49 (89) 30 90 46 64 Schleißheimer Straße 26/MG, 80333 München Sitz der Gesellschaft: München, Amtsgericht München: HRB 199263 Vorstand: Patrick Ben Koetter, Marc Schiffbauer Aufsichtsratsvorsitzender: Florian Kirstein
