[asterisk-bugs] [JIRA] (ASTERISK-26738) frequent segfaults since activation of DNS SRV

[Michael Maier (JIRA)]

Michael Maier created ASTERISK-26738:
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             Summary: frequent segfaults since activation of DNS SRV
                 Key: ASTERISK-26738
                 URL: https://issues.asterisk.org/jira/browse/ASTERISK-26738
             Project: Asterisk
          Issue Type: Bug
      Security Level: None
          Components: Resources/res_pjsip
    Affects Versions: 13.13.1
         Environment: Centos 6 64bit
FreePBX 13.0.190.7
IPv4 and IPv6
dual core processor
            Reporter: Michael Maier
            Severity: Critical


After switching to DNS SRV w/ 5 parallel trunks I'm getting frequent segfaults like the attached one. Backtrace is built on base of patched Schmooze RPM source package:
- Patch to get libasteriskpj.so.2 symbols
- Patch from https://issues.asterisk.org/jira/browse/ASTERISK-26675

Parallel running tcpdump shows, that REGISTER is sent at the time of the crash.
In detail:
- The DNS SRV entry has two hostnames (see https://issues.asterisk.org/jira/browse/ASTERISK-26735). All the time before the crash, ipaddress 217.0.23.108 is used for REGISTER.
- At the moment of the crash, 2(!!) REGISTERS are sent nearly at the same time (0.01s difference) for the same trunk! The first to 217.0.23.140(!), the second to the usual 217.0.23.108. The answer from 217.0.23.108 comes first (200 ok), the answer from 217.0.23.140 comes 0.09s later and is 401 unauthorized. That's the end. Now the crash appears.




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