Cancel CV sleep during subtransaction abort.
Generally, error recovery paths that need to do things like LWLockReleaseAll and pgstat_report_wait_end also need to call ConditionVariableCancelSleep, but AbortSubTransaction was missed. Since subtransaction abort might destroy up the DSM segment that contains the ConditionVariable stored in cv_sleep_target, this can result in a crash for anything using condition variables. Reported and diagnosed by Andres Freund. Discussion: http://postgr.es/m/20171221110048.rxk6464azzl5t2fi@alap3.anarazel.de
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@ -4717,6 +4717,9 @@ AbortSubTransaction(void)
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/* Reset WAL record construction state */
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XLogResetInsertion();
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/* Cancel condition variable sleep */
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ConditionVariableCancelSleep();
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/*
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* Also clean up any open wait for lock, since the lock manager will choke
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* if we try to wait for another lock before doing this.
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