[asterisk-bugs] [JIRA] (ASTERISK-27909) Deadlock in cdr.c: cdr_batch_lock vs cdr_pending_lock

[Denis Lebedev (JIRA)]

Denis Lebedev created ASTERISK-27909:
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             Summary: Deadlock in cdr.c: cdr_batch_lock vs cdr_pending_lock
                 Key: ASTERISK-27909
                 URL: https://issues.asterisk.org/jira/browse/ASTERISK-27909
             Project: Asterisk
          Issue Type: Bug
      Security Level: None
          Components: CDR/General
    Affects Versions: 15.4.0
         Environment: CentOS Linux 7 (Core)
Linux *** 3.10.0-862.2.3.el7.x86_64 #1 SMP Wed May 9 18:05:47 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux

Asterisk versions: 15.4.0
            Reporter: Denis Lebedev


We faced with deadlock in cdr.c in functions:
{noformat}
static int submit_scheduled_batch(const void *data)

static void submit_unscheduled_batch(void)
{noformat}

Previously there was another deadlock which was fixed in ASTERISK-21162. That task added pretty the same mutex {{cdr_sched_lock}} on which asterisk is stucked in deadlock in consequent versions.

The problem is quite rare so it's almost impossible to reproduce it under some artificial circumstances.

Symptoms:
* asterisk stops to flush cdr items into DB
* begins to "eat" all memory on the host
* but proceeds serving calls



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