[asterisk-bugs] [JIRA] (ASTERISK-21405) res_timing_pthread fails to return from write, causing timer dependent operations to block indefinitely

[Rusty Newton (JIRA)]

Rusty Newton created ASTERISK-21405:
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             Summary: res_timing_pthread fails to return from write, causing timer dependent operations to block indefinitely
                 Key: ASTERISK-21405
                 URL: https://issues.asterisk.org/jira/browse/ASTERISK-21405
             Project: Asterisk
          Issue Type: Bug
      Security Level: None
          Components: Channels/chan_sip/General, Resources/res_timing_pthread
    Affects Versions: 1.8.20.0, 1.8.21.0
            Reporter: Matt Jordan


Tony from Schmooze Com reported that since upgrading to Asterisk 1.8.20.x, there have been numerous apparent lock ups in {{chan_sip}}, wherein all calls stop being processed. Other operations (such as querying from the CLI) continue to work correctly.

Two backtraces taken from affected systems point to a call to {{res_timing_pthread}}'s write_byte not returning. This call is attempting to write a byte into a timer's pipe. In general, while the pipe is blocking, this operation should write the byte and immediately return. Failure to return typically indicates that the pipe is full.

It isn't clear right now which timer is actually causing the problem, nor is it clear why a read operation isn't being performed on some timer. However, as noted in ASTERISK-14050, having a single timer run into this state will cause this exact problem.


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