[Pdns-users] Signal 6 and Signal 13

[Graham White]

Hi, I am using PowerDNS on a couple of identical servers. In my log
messages on each machine I am noticing restarts by pdns based on it
receiving a signal 6 or signal 13. This happens approximately once or
twice each day seemingly at random times. The boxes are also not being
hit with dns queries at this time. The install is the Redhat 2.9.7
static RPM and the machines are running RedHat 7.3. Here's the output
from the log files
 
Jun 30 03:37:09 chubarov pdns[20269]: Got a signal 6, attempting to
print trace: 
Jun 30 03:37:09 chubarov pdns[20269]: [0x80a9d3d]
Jun 30 03:37:09 chubarov pdns[20269]: [0x8177218]
Jun 30 03:37:09 chubarov pdns[20269]: [0x817f398]
Jun 30 03:37:09 chubarov pdns[20269]: [0x8177590]
Jun 30 03:37:09 chubarov pdns[20269]: [0x817f720]
Jun 30 03:37:09 chubarov pdns[20269]: [0x816d467]
Jun 30 03:37:09 chubarov pdns[20269]: [0x816d4b4]
Jun 30 03:37:09 chubarov pdns[20269]: [0x816d636]
Jun 30 03:37:09 chubarov pdns[20269]: [0x80f6b76]
Jun 30 03:37:09 chubarov pdns[20269]: [0x80af515]
Jun 30 03:37:09 chubarov pdns[20269]: [0x807cbc9]
Jun 30 03:37:09 chubarov pdns[20269]: [0x8080522]
Jun 30 03:37:09 chubarov pdns[20269]: [0x80d2684]
Jun 30 03:37:09 chubarov pdns[20269]: [0x80d04b1]
Jun 30 03:37:09 chubarov pdns[20269]: [0x8174aaa]
Jun 30 03:37:09 chubarov pdns[20269]: [0x81b41aa]
Jun 30 03:37:10 chubarov pdns[15415]: Our pdns instance (20263) exited
after signal 6
Jun 30 03:37:10 chubarov pdns[15415]: Respawning
Jun 30 03:37:11 chubarov pdns[7816]: Guardian is launching an instance
Jun 30 03:37:11 chubarov [7816]: [BindBackend] This is the bind backend
version 2.9.7 (Mar 20 2003, 13:12:33) reporting
Jun 30 03:37:11 chubarov [7816]: [Bind2Backend] This is the bind backend
version 2.9.7 (Mar 20 2003, 13:11:30) reporting
Jun 30 03:37:11 chubarov [7816]:  [RandomBackend] This is the
randombackend version 2.9.7 (Mar 20 2003, 13:10:58) reporting
Jun 30 03:37:11 chubarov [7816]:  [XDBBackend] This is the xdbbackend
(Mar 20 2003, 13:04:10) reporting
Jun 30 03:37:11 chubarov [7816]: [PdnsBackend] This is the pdns module
version 2.9.7 (Mar 20 2003, 13:04:02) reporting
Jun 30 03:37:11 chubarov [7816]: [PIPEBackend] This is the pipebackend
version 2.9.7 (Mar 20 2003, 13:03:44) reporting
Jun 30 03:37:11 chubarov [7816]: This is module gmysqlbackend.so
reporting
Jun 30 03:37:11 chubarov [7816]: This is module gmysqlbackend.so
reporting
Jun 30 03:37:11 chubarov [7816]: [MySQLbackend] This is the mysql module
version 2.9.7 (Mar 20 2003, 13:02:43) reporting
Jun 30 03:37:11 chubarov pdns[7816]: This is a guarded instance of pdns
Jun 30 03:37:11 chubarov pdns[7816]: Opened file
'/etc/powerdns/pdns.conf' for configuration
Jun 30 03:37:11 chubarov pdns[7816]: UDP server bound to 172.16.0.152:53
Jun 30 03:37:11 chubarov pdns[7816]: UDP server bound to 65.39.211.5:53
Jun 30 03:37:11 chubarov pdns[7816]: UDP server bound to 65.39.211.7:53
Jun 30 03:37:11 chubarov pdns[7816]: UDP server bound to 65.39.211.9:53
Jun 30 03:37:11 chubarov pdns[7816]: UDP server bound to 65.39.211.11:53
Jun 30 03:37:11 chubarov pdns[7816]: UDP server bound to 65.39.211.13:53
Jun 30 03:37:11 chubarov pdns[7816]: UDP server bound to 65.39.211.15:53
Jun 30 03:37:11 chubarov pdns[7816]: PowerDNS 2.9.7 (C) 2001-2003
PowerDNS.COM BV (Mar 20 2003, 13:09:58) starting up
Jun 30 03:37:11 chubarov pdns[7816]: PowerDNS comes with ABSOLUTELY NO
WARRANTY. This is free software, and you are welcome 
to redistribute it according to the terms of the GPL version 2.
Jun 30 03:37:11 chubarov pdns[7816]: Set effective group id to 501
Jun 30 03:37:11 chubarov pdns[7816]: Set effective user id to 501
Jun 30 03:37:11 chubarov pdns[7816]: About to create 1 backend threads
Jun 30 03:37:11 chubarov pdns[7821]: gmysql Connection succesful
Jun 30 03:37:11 chubarov pdns[7816]: Done launching threads, ready to
distribute questions

The signal 13 messages basically prints out the same information without
the trace etc. I may try a source build of 2.9.9 and see if the issue
goes away. PDNS is being launched with --daemon and --guardian=yes via
the init.d script. It uses the gmysql backend connector. Has anyone else
seen these messages? Thanks
 
Graham W.

 

 

 
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