[asterisk-bugs] [JIRA] (ASTERISK-28893) UDP buffers full

[Martin Nyström (JIRA)]

Martin Nyström created ASTERISK-28893:
-----------------------------------------

             Summary: UDP buffers full 
                 Key: ASTERISK-28893
                 URL: https://issues.asterisk.org/jira/browse/ASTERISK-28893
             Project: Asterisk
          Issue Type: Bug
      Security Level: None
          Components: Channels/chan_sip/General
    Affects Versions: 13.31.0
         Environment: Centos 7.7.1908
Linux 3.10.0-1062.9.1.el7.x86_64
            Reporter: Martin Nyström
            Severity: Critical


We seem to repeatable run into full udp buffers in our Asterisk. I am trying to figure out if Asterisk is doing something incorrectly or if the issue lays in the OS level. When this happens, as you can imagine, all UDP traffic starts to get dropped and an asterisk restart is required.

Now I could increase the UDP buffers, but it feels like that will only push the issue to the future instead and if its in Asterisk then that solution would not be ideal or long-term.

[root at server ~]# netstat -c --udp -an | grep 5060
udp   213248      0 0.0.0.0:5060            0.0.0.0:*                          
udp   213248      0 0.0.0.0:5060            0.0.0.0:*                          
udp   213248      0 0.0.0.0:5060            0.0.0.0:*                          
udp   213248      0 0.0.0.0:5060            0.0.0.0:*                          
udp   213248      0 0.0.0.0:5060            0.0.0.0:*                          
udp   213248      0 0.0.0.0:5060            0.0.0.0:*   

[root at server ~]# sysctl -a | grep mem
net.core.optmem_max = 20480
net.core.rmem_default = 212992
net.core.rmem_max = 212992
net.core.wmem_default = 212992
net.core.wmem_max = 212992
net.ipv4.igmp_max_memberships = 20
net.ipv4.tcp_mem = 1443162	1924218	2886324
net.ipv4.tcp_rmem = 4096	87380	6291456
net.ipv4.tcp_wmem = 4096	16384	4194304
net.ipv4.udp_mem = 1445055	1926743	2890110
net.ipv4.udp_rmem_min = 4096
net.ipv4.udp_wmem_min = 4096
sysctl: reading key "net.ipv6.conf.all.stable_secret"
sysctl: reading key "net.ipv6.conf.default.stable_secret"
sysctl: reading key "net.ipv6.conf.ens192.stable_secret"
sysctl: reading key "net.ipv6.conf.ens224.stable_secret"
sysctl: reading key "net.ipv6.conf.lo.stable_secret"
vm.lowmem_reserve_ratio = 256	256	32
vm.memory_failure_early_kill = 0
vm.memory_failure_recovery = 1
vm.nr_hugepages_mempolicy = 0
vm.overcommit_memory = 1

Attached core dumps when this happens.



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