[jira] [Created] (HAWQ-368) Core when canceling a query

["Noa Horn (JIRA)" <ji...@apache.org>]

Noa Horn created HAWQ-368:
-----------------------------

             Summary: Core when canceling a query 
                 Key: HAWQ-368
                 URL: https://issues.apache.org/jira/browse/HAWQ-368
             Project: Apache HAWQ
          Issue Type: Bug
          Components: Core
            Reporter: Noa Horn
            Assignee: Lei Chang


This issue was revealed by using SimEx, with gp_simex_class set to 1 (cancel query).

Repro:

Setup:
{noformat}
hawq config -c gp_simex_init -v on
hawq config -c gp_simex_class -v 1
hawq restart cluster
{noformat}

Failing query:
{noformat}
BEGIN;
SET gp_simex_run=on;
select * from a; 
FATAL:  Unexpected internal error (idle_tracker.c:181)
DETAIL:  FailedAssertion("!(isProcessActive)", File: "idle_tracker.c", Line: 181)
HINT:  Process 62979 will wait for gp_debug_linger=120 seconds before termination.
Note that its locks and other resources will not be released until then.
ERROR:  canceling statement due to user request
{noformat}

backtrace:
{noformat}
(lldb) bt
* thread #1: tid = 0x2dc108, 0x9a0aaace libsystem_kernel.dylib`__select + 10, queue = 'com.apple.main-thread', stop reason = signal SIGSTOP
  * frame #0: 0x9a0aaace libsystem_kernel.dylib`__select + 10
    frame #1: 0x007978cf postgres`pg_usleep(microsec=30000000) + 126 at pgsleep.c:43
    frame #2: 0x005c44d7 postgres`elog_debug_linger(edata=0x00bd2a00) + 370 at elog.c:4125
    frame #3: 0x005bc7a6 postgres`errfinish(dummy=0) + 415 at elog.c:595
    frame #4: 0x005badd8 postgres`ExceptionalCondition(conditionName=0x0096ded0, errorType=0x0096dd93, fileName=0x0096dd84, lineNumber=181) + 272 at assert.c:66
    frame #5: 0x00605843 postgres`IdleTracker_DeactivateProcess + 366 at idle_tracker.c:181
    frame #6: 0x004c96a1 postgres`PostgresMain(argc=4, argv=0x7db24480, username=0x7db24aa8) + 7021 at postgres.c:4641
    frame #7: 0x00468ed1 postgres`BackendRun(port=0x7b77ab80) + 1008 at postmaster.c:5875
    frame #8: 0x0046826b postgres`BackendStartup(port=0x7b77ab80) + 381 at postmaster.c:5468
    frame #9: 0x00461305 postgres`ServerLoop + 1121 at postmaster.c:2147
    frame #10: 0x0045fe32 postgres`PostmasterMain(argc=9, argv=0x7b779750) + 5159 at postmaster.c:1439
    frame #11: 0x00374a16 postgres`main(argc=9, argv=0x7b779750) + 1007 at main.c:226
    frame #12: 0x90cf3701 libdyld.dylib`start + 1
(lldb) f 5
frame #5: 0x00605843 postgres`IdleTracker_DeactivateProcess + 366 at idle_tracker.c:181
   178                 return;
   179             }
   180     
-> 181             Assert(isProcessActive);
   182             Assert(deactivationVersion <= activationVersion);
   183     
   184             /* No new runaway event can come in */
(lldb) p isProcessActive
(bool) $0 = '\0'
{noformat}



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