[asterisk-bugs] [JIRA] (ASTERISK-20803) Segfault during calloc, core dump shows logging string at requested pointer address

[Rusty Newton (JIRA)]

Rusty Newton created ASTERISK-20803:
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             Summary: Segfault during calloc, core dump shows logging string at requested pointer address
                 Key: ASTERISK-20803
                 URL: https://issues.asterisk.org/jira/browse/ASTERISK-20803
             Project: Asterisk
          Issue Type: Bug
      Security Level: None
          Components: General
         Environment: CentOS 6.3 (Final)
Kernel 2.6.32-279.9.1el6.x86_64
4 Gb memory, single Intel Xeon E6520
Asterisk 1.8.7.2
            Reporter: Emiel Suilen
            Severity: Critical


In an environment with many calls (>4k calls/24 hours)  and full logging turned on, our customer experiences occasional crashes. A backtrace of the core dump shows this happens during channel creation, and that the pointer used for the channel is overwriting a string used by the logger.

Attached are the backtrace, full backtrace, and an examination of the relevant frame in GDB, which shows that the allocated pointer already holds information, that starts several blocks earlier.

A full core dump cannot be provided, due to the size. The core dump originated from 1.8.7.2, but the same core dumps were also found in higher versions. Unfortunately, these were compiled without debug info. We are unable to reproduce this for other customers, or on single user machines.

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