PI86504: 0C4 IN CELHV003 AFTER XPLINK EXCEPTION HANDLING

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• An 0C4 is encountered in the LE C++ Runtime when an exception is
  thrown in a function with a very large stack frame/memory usage.
  The issue only occurs when using XPLINK.
  
  
  
     === TEST CASE ===
  
  extern "C" int printf(const char *, ...);
  void foo(void *p) { }
  
  struct NRV {
    ~NRV() {
      printf("%p\n", (void *)this);
    }
  };
  
  NRV executeCommand(bool throw42) {
    NRV output;
    char ifrabuf[1000000];
    try {
      foo(ifrabuf);
    } catch ( ... ) { }
  
    if (throw42) {
      foo(0);
  
      printf("%p\n", (void *)&output);
      throw 42;
    }
    return output;
  }
  
  int main(void) {
    try { executeCommand(true); }
    catch ( ... ) { }
  }
  
  
  $ xlC -qxplink apar.cpp
  $ ./a.out
  265B7F10
  CEE3204S The system detected a protection exception (System
  Completion Code=0C4).
  From entry point executeCommand(bool) at compile unit offset
  +0000012E at entry offset +0000012E at address 25D0A2EE.
  Segmentation fault
  $
  
  
  Traceback:
      DSA   Entry       E  Offset  Statement   Load Mod
      1     CEEHDSP     +00004A4C              CEEPLPKA
      2     CEEHRNUH    +0000009A              CEEPLPKA
      3     __zerrh     +0000065A              CELHV003
      4     CEEVROND    +0000127E              CEEPLPKA
      5     CEEHDSP     +00001A8C              CEEPLPKA
      6     CEEVH2OS    +0000006E              CEEPLPKA
      7     __DoThrow   +0000008E              CELHV003
      8     __Throw     +00000184              CELHV003
      9     CEEVHPFR    +00000002              CEEPLPKA
      10    executeCommand(bool)
                        +0000012E              a.out
      11    CEEVHPFR    +00000002              CEEPLPKA
      12    main        +0000003C              a.out
  

Local fix

• Do not use XPLINK.
  Reduce size of stack frame.
  

Problem summary

• ****************************************************************
  * USERS AFFECTED:  z/OS XL C++ V2R1 and later users compiling  *
  *                 applications with very large stack frames    *
  *                 and XPLINK                                   *
  ****************************************************************
  * PROBLEM DESCRIPTION: Failure during C++ exception handling.  *
  ****************************************************************
  .
  

Problem conclusion

• Apply service provided.
  

Temporary fix

Comments

APAR Information

• APAR is sysrouted FROM one or more of the following:

• APAR is sysrouted TO one or more of the following:

  PI87350 PI95830 PI96199

Modules/Macros

• CCNECICS CCNECWI  CCNED210 CCNEDSCT CCNEDWRT CCNEFILT CCNEHIFC
  CCNEMDEP CCNEOPTP CCNEP    CCNEPP   CCNETBY  CCNMSGE  CCNMSGT
  

Fix information

• Fixed component name

  C/C++ FOR MVS

• Fixed component ID

  56551210A

Applicable component levels

• R790 PSY UI50869

     UP17/10/20 P F710

Fix is available

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