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#2745 hang-up (too many open files) after migration to VZ7

linux
invalid
Niels Baggesen
centos (1) vz7 (1)
8
2017-09-22
2016-09-23
Valentyn
No

Hello,
After migration from OpenVZ to VZ7 net-snmp start hang up after a while (too many open files).

CT-1146 /# rpm -q net-snmp
net-snmp-5.5-57.el6.1.x86_64
CT-1146 /#

CT-1146 /# lsof | grep -i snmp | wc -l
1071
Like this

snmpd 13199 root 1017r REG 0,39 0 4026532061 /proc/partitions
snmpd 13199 root 1018r REG 0,39 0 4026532061 /proc/partitions
snmpd 13199 root 1019r REG 0,39 0 4026532061 /proc/partitions
snmpd 13199 root 1020r REG 0,39 0 4026532061 /proc/partitions
snmpd 13199 root 1021r REG 0,39 0 4026532061 /proc/partitions
snmpd 13199 root 1022r REG 0,39 0 4026532061 /proc/partitions

CT-1146 /# cat /proc/partitions
major minor #blocks name

182 526832 24772608 ploop32927
182 526833 24770560 ploop32927p1
CT-1146 /# ls -lh /proc/partitions
-r--r--r-- 1 root root 0 вер 21 13:38 /proc/partitions
CT-1146 /#

After restart working fine untill reach open file limit.

Discussion

  • Valentyn

    Valentyn - 2016-09-23

    Forgot log

    CT-1146 /# tail /var/log/messages
    Sep 23 12:26:50 voip snmpd[13199]: /proc/stat: Too many open files
    Sep 23 12:26:51 voip snmpd[13199]: could not create socket
    Sep 23 12:26:51 voip snmpd[13199]: cannot open /proc/net/dev ...
    Sep 23 12:26:55 voip snmpd[13199]: /proc/partitions: Too many open files
    Sep 23 12:26:55 voip snmpd[13199]: /proc/stat: Too many open files
    Sep 23 12:27:00 voip snmpd[13199]: /proc/partitions: Too many open files
    Sep 23 12:27:00 voip snmpd[13199]: /proc/stat: Too many open files
    Sep 23 12:27:05 voip snmpd[13199]: /proc/partitions: Too many open files
    Sep 23 12:27:05 voip snmpd[13199]: /proc/stat: Too many open files
    Sep 23 12:27:06 voip snmpd[13199]: cannot open /proc/net/dev ...

     

  • Niels Baggesen

    Niels Baggesen - 2016-09-23
    • status: open --> pending
    • assigned_to: Niels Baggesen
     

  • Niels Baggesen

    Niels Baggesen - 2016-09-23

    Have a look at bug 2219 https://sourceforge.net/p/net-snmp/bugs/2219/
    It looks as if the RedHat folks have not picked that up, although I am stumped as to why it does not use /proc/diskstats to get those statistics?

     

  • Valentyn

    Valentyn - 2016-09-23

    Hmm, you right, I've checked source code (from src.rpm) and fclose is absent.
    Ok, you can close this bug and I'll open new one for RedHat folks

     

    Last edit: Valentyn 2016-09-23

  • Niels Baggesen

    Niels Baggesen - 2016-09-26
    • status: pending --> invalid
     

  • randome

    randome - 2017-09-21

    @Valentyn - any news on that? As I'm also struggeling with this Problem now ... :-/

    thx
    Andreas Schnederle-Wagner

     

  • randome

    randome - 2017-09-22

    btw) as I didn't found a Ticket from you with RedHat - I proposed the Patch to them --> https://bugzilla.redhat.com/show_bug.cgi?id=1494255

     

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