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3126590 - ASE crash or hang following Signal 11 in LeHash functions - SAP ASE for Business Warehouse

Symptom

  • SAP BW queries fail with an "infected with signal 11" error during Hash operations. 

  • ASE parallel worker process spids terminate, along with a stack trace.

  • The problem is specific to systems where ASE parallelism is enabled where ASE configuration parameters: "max parallel degree" and/or "max query parallel degree" are set to a value > 1.

  • In the ASE errorlog, any or all of the following errors are reported:

    Current process (0x830042) infected with signal 11 (SIGSEGV)
    Address 0x0x00000000022faf4e (LeHashBucket::Find(LeHashContext*, int, LeAlignedDataRow*, unsigned int, int)+0x6e), siginfo (code, address) = (128, 0x(nil))

    Current process (0x830042) infected with signal 11 (SIGSEGV)
    Address 0x0x000000000178ebdb (LeHashTable::copy(LeHashTable*)+0x31), siginfo (code, address) = (1, 0x0x0000000000000010)

    Current process (0x830042) infected with signal 11 (SIGSEGV)
    Address 0x0x00000000022e837d (LeHashTable::GetPartition(int)+0x27), siginfo (code, address) = (1, 0x0x0000000000000008)
  •  The accompanying stack trace includes functions:

    LeHashContext::updHashTable
    LeHashContext::GetNext
    LeHashOp::_LeOpNext
    LeOperator::LeOpNext
    LeEmitXchgOp::_LeOpNext
    LePlanNext            
    LePlanOpenAndExecute      

    After these errors, either one of the below events occur:

  • If "secondary signal handling" is enabled, ASE crashes due to a "secondary signal":

    FATAL UNHANDLED EXCEPTION: signal -1368775248 hit while handling a previously hit signal. The server cannot continue and will shut down.

  • If "secondary signal handling" is disabled, ASE hangs due to the affected spid becoming a zombie:

    Task 12517472 is made zombie because it cannot be cleaned up during its termination. This task may have resources allocated to it.


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Environment

  • SAP Adaptive Server Enterprise (ASE) 16.0 for Business Warehouse
  • SAP NetWeaver (all versions)

Product

SAP NetWeaver 7.5

Keywords

BW, HashOp, CR825884, CR#825884, 825884, SEGV, segmentation, storage, access, violation, fault, segfault, kisignal, stacktrace, stack, registers , KBA , BW-SYS-DB-SYB , BW on Adaptive Server Enterprise , BC-SYB-ASE , Sybase ASE Database Platform (non Business Suite) , Problem

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