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On Ubuntu 14.04, calling the shell's "ulimit -c 20" command sets a ULIMIT_CORE
in the kernel of 20480 bytes, as expected, verified by looking at
/proc/$$/limits. (This is just an example; I'd likely not use a value that
low.) The contents of /proc/sys/kernel/core_pattern is
|/usr/share/apport/apport %p %s %c %P
When a process gets a memory fault, a core file much larger than 20480
bytes can be created; apport multiplies its third argument, 20480, by
1024, giving a limit of 20MB.
Test program:
#include <sys/time.h>
#include <sys/resource.h>
#include <stdlib.h>
#include <stdio.h>
main()
{
struct rlimit r;
getrlimit(RLIMIT_CORE, &r);
printf("%ld %ld\n", (long) r.rlim_cur, (long)r.rlim_max);
malloc(1000000);
abort();
}
This produces a core dump of around 1.2MB.
Excerpts from /var/log/apport.log for the test program :
ERROR: apport (pid 4574) Sun Jul 20 21:37:38 2014: called for pid 4573, signal
6, core limit 204800
ERROR: apport (pid 4574) Sun Jul 20 21:37:38 2014: executable: /home/mp/ab
(command line "./ab")
ERROR: apport (pid 4574) Sun Jul 20 21:37:38 2014: executable does not belong
to a package, ignoring
ERROR: apport (pid 4574) Sun Jul 20 21:37:38 2014: writing core dump to
/home/mp/core (limit: 209715200)
** Affects: apport (Ubuntu)
Importance: Undecided
Status: New
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apport computes incorrect core dump size limit
https://bugs.launchpad.net/bugs/1346497
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