[ClusterLabs] crm_report consumes all available RAM

[Vladislav Bogdanov]

Hi,

just discovered very interesting issue.
If there is a system user with very big UID (80000002 in my case),
then crm_report (actually 'grep' it runs) consumes too much RAM.

Relevant part of the process tree at that moment looks like (word-wrap off):
USER       PID %CPU %MEM    VSZ   RSS TTY      STAT START   TIME COMMAND
...
root     25526  0.0  0.0 106364   636 ?        S    12:37   0:00          \_ /bin/sh /usr/sbin/crm_report --dest=/var/log/crm_report -f 0000-01-01 00:00:00
root     25585  0.0  0.0 106364   636 ?        S    12:37   0:00              \_ bash /var/log/crm_report/collector
root     25613  0.0  0.0 106364   152 ?        S    12:37   0:00                  \_ bash /var/log/crm_report/collector
root     25614  0.0  0.0 106364   692 ?        S    12:37   0:00                      \_ bash /var/log/crm_report/collector
root     27965  4.9  0.0 100936   452 ?        S    12:38   0:01                      |   \_ cat /var/log/lastlog
root     27966 23.0 82.9 3248996 1594688 ?     D    12:38   0:08                      |   \_ grep -l -e Starting Pacemaker
root     25615  0.0  0.0 155432   600 ?        S    12:37   0:00                      \_ sort -u

ls -ls /var/log/lastlog shows:
40 -rw-r--r--. 1 root root 23360000876 Sep  8 04:36 /var/log/lastlog

That is sparse binary file, which consumes only 40k of disk space.
At the same time its size is 23GB, and grep takes all the RAM trying to
grep a string from a 23GB of mostly zeroes without new-lines.

I believe this is worth fixing,

Thank you,
Vladislav