GNU bug report logs -
#36838
mcron leaves zombies around
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Reported by: Robert Vollmert <rob <at> vllmrt.net>
Date: Mon, 29 Jul 2019 15:40:01 UTC
Severity: normal
Done: Maxim Cournoyer <maxim.cournoyer <at> gmail.com>
Bug is archived. No further changes may be made.
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[Message part 1 (text/plain, inline)]
Your bug report
#36838: mcron leaves zombies around
which was filed against the guix package, has been closed.
The explanation is attached below, along with your original report.
If you require more details, please reply to 36838 <at> debbugs.gnu.org.
--
36838: https://debbugs.gnu.org/cgi/bugreport.cgi?bug=36838
GNU Bug Tracking System
Contact help-debbugs <at> gnu.org with problems
[Message part 2 (message/rfc822, inline)]
Hi,
Maxim Cournoyer <maxim.cournoyer <at> gmail.com> writes:
> Hi Leo,
>
> Leo Prikler <leo.prikler <at> student.tugraz.at> writes:
>
>> Hi Maxim,
>>
>> I still have a defunct mcron flying around with a fairly standard Guix
>> configuration. The only service running through mcron seems to be
>> rottlog-service-type.
>
> If you have the energy/bandwidth, would you mind trying this patch here:
> https://lists.gnu.org/archive/html/bug-mcron/2021-08/msg00008.html; it
> may have positive side-effects in that regard, I believe.
>
> I've modified the mcron package to use a local checkout in my system
> config like so:
>
> @@ -2,7 +2,14 @@
> ;;; RAID-1c3 storage bay.
> (use-modules (gnu)
> (guix modules)
> - (srfi srfi-1))
> + (srfi srfi-1)
> + ;; for mcron experiment
> + (gnu packages autotools)
> + (gnu packages guile-xyz)
> + (gnu packages man)
> + (gnu packages texinfo)
> + (guix git)
> + (guix packages))
>
> (use-service-modules admin desktop docker linux mail mcron networking nfs nix
> spice ssh sysctl telephony virtualization vpn xorg)
> @@ -196,6 +203,15 @@
> (pam-limits-entry "@realtime" 'both 'memlock 'unlimited)))
> (service mcron-service-type
> (mcron-configuration
> + (mcron (package/inherit mcron
> + (source (git-checkout
> + (url "file:///home/maxim/src/mcron")))
> + (native-inputs (append
> + `(("autoconf" ,autoconf)
> + ("automake" ,automake)
> + ("help2man" ,help2man)
> + ("texinfo" ,texinfo))
> + (package-native-inputs mcron)))))
> (jobs (list duckdns-job
> backup-home-job
>
>
> The output is now annotated as:
>
> 2021-08-25T00:01:34 /gnu/store/xcngj8vg5j8g54r3aqm71vbgsgrsjl31-rottlog-0.72.2/sbin/rottlog: mail: Cannot open mailer: No such file or directory
> 2021-08-25T00:01:34 /gnu/store/xcngj8vg5j8g54r3aqm71vbgsgrsjl31-rottlog-0.72.2/sbin/rottlog: mail: cannot send message: No such file or directory
> 2021-08-25T00:01:34 /gnu/store/xcngj8vg5j8g54r3aqm71vbgsgrsjl31-rottlog-0.72.2/sbin/rottlog: mail: Cannot open mailer: No such file or directory
> 2021-08-25T00:01:34 /gnu/store/xcngj8vg5j8g54r3aqm71vbgsgrsjl31-rottlog-0.72.2/sbin/rottlog: mail: cannot send message: No such file or directory
> 2021-08-25T00:01:34 /gnu/store/xcngj8vg5j8g54r3aqm71vbgsgrsjl31-rottlog-0.72.2/sbin/rottlog: mail: Cannot open mailer: No such file or directory
> 2021-08-25T00:01:34 /gnu/store/xcngj8vg5j8g54r3aqm71vbgsgrsjl31-rottlog-0.72.2/sbin/rottlog: mail: cannot send message: No such file or directory
> 2021-08-25T00:01:34 /gnu/store/xcngj8vg5j8g54r3aqm71vbgsgrsjl31-rottlog-0.72.2/sbin/rottlog: completed in 93.625s
> 2021-08-25T00:05:00 duckdns-update: running...
> 2021-08-25T00:05:01 duckdns-update: completed in 0.519s
>
> And I don't have any mcron zombie process lying around, unless I'm
> reading the ps output wrong.
It's been a while and I haven't seen this problem myself in all this
time; closing. Do reopen if you encounter it or better yet, have a
reproducer for it.
--
Thanks,
Maxim
[Message part 3 (message/rfc822, inline)]
It seems that mcron doesn’t clean up after itself. I regularly see
some zombie processes around, presumably left over by each of my
two 15-minute cron jobs:
root 21285 0.0 0.3 24124 3248 ? Ss 11:05 0:00 /gnu/store/mamwayq00mqs85kgs6ibww7xw6dy776s-mcron-1.1.1/bin/mcron /gnu/store/rdi71izz4d16v77hb8h2jks0s3q9zini-mcron-job /gnu/store/k7dn1v7qpi4kz183glmbgsf1c7pj19xx-mcron-job /gnu/store/lfyj23bzhc14y5rqi91g493jql9dphxk-mcron-job /gnu/store/mx9k5n92kmhryn3vh4607hrmnkjb8dl6-mcron-job /gnu/store/l4nxmajr0i5g07fxvrgnaw29zd1jq0qw-mcron-job
root 26611 0.0 0.0 0 0 ? Z 17:29 0:00 [mcron] <defunct>
root 26612 0.0 0.0 0 0 ? Z 17:29 0:00 [mcron] <defunct>
In case that matters, they’re defined using the following:
(define puzzledb-tweets-pzv-job
(let* ((exp
(with-imported-modules '((helpers))
#~(begin
(use-modules (helpers))
(let ((backend (read-secret "tools.jwt"))
(twitter (read-secret "twitter.token")))
(runl (string-append #$puzzledb-tools "/bin/tweets")
"-backend_token" backend
"-token" twitter
"-deletes")))))
(script (program-file "puzzledb-tweets-pzv-job" exp)))
#~(job "*/15 * * * *" ; every fifteen minutes
#$script)))
where the module helpers contains:
(define-module (helpers)
#:use-module (ice-9 textual-ports)
#:export (runl read-secret))
(define* (runl prog . args)
(apply execl prog prog args))
(define* (read-secret file)
(string-trim-both
(get-string-all
(open-input-file
(string-append "/etc/puzzledb/secrets/" file)))))
This bug report was last modified 1 year and 309 days ago.
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