PH68674: LIBERTY Z/OS 24.0.0.12 TAKES AN ABEND0C4 DUMP FOR GPF IN COM/IBM/IO/ASYNC/ ASYNCLIBRARY.AIO_PREPARE2

APAR status

• Closed as program error.

Error description

• ABEND0C4 TDUMP is taken with failing java callstack below, and
  may be followed by an
  ABEND=40D,RC=10,COMPON=RTM2,COMPID=SCRTM,ISSUER=IEAVTRT2,MEMTERM
  -
               UNRECOVERABLE ABEND FAILURE  DUMP
  
  thread id: 0x28381800
    registers:
     PSW    = 0x070c140180ff1226   R0     = 0x0000005440000001
  R1     = 0x7b032c90e41f1520   R2     = 0x00000000070c1401
     R3     = 0x000000001be0eae0   R4     = 0x0000000000a706b8
  R5     = 0x0000000000001960   R6     = 0x0000000000800081
     R7     = 0x0000000000000000   R8     = 0x0000000000ff1dc8
  R9     = 0x000001ef00ff19a8   R10    = 0x0000005400000000
     R11    = 0x0000000000f3f980   R12    = 0x000000000000400a
  R13    = 0x0000005400000000   R14    = 0x0000000080ff0adc
     R15    = 0x000000001be0eae0
    native stack sections:
    native stack frames:
    properties:
     CAA=0x5187ffec60                          CAA CEL level=0x1f
     EDB=0x51481055e8                          IFA Enabled=no
     PSW:64=0x70c140180ff1226
  PTHREADID=0x2838180000000058
     Stack direction=up                        TCB=0xa706b8
     Task Completion Code=0xffffffff940c4000   WEBFLAG2=0x01
    associated Java thread: <no associated Java thread>
  
  
  name:          Shared TCPChannel NonBlocking Accept Thread
     id:            0x2838180000000058
     Thread object: java/lang/Thread @ 0xb1da5330
     Native info:   !j9vmthread 0x7a122700  !stack 0x7a122700
     Daemon:        true
     ID:            102 (0x66)
     Priority:      5
     Thread.State:  RUNNABLE
  
     JVMTI state:   ALIVE RUNNABLE
  
     Java stack frames:
  
      bp: 0x000000007ac7b7d8  method: long
  com/ibm/io/async/AsyncLibrary.aio_prepare2(long, long)  (Native
  Method)
       objects: <no objects in this frame>
      bp: 0x0000000000000000  method: long
  com/ibm/io/async/AsyncLibrary.prepare2(long, long)  source:
  AsyncLibrary.java:611
       objects: <no objects in this frame>
      bp: 0x000000007ac7b5f0  method: void
  com/ibm/io/async/AsyncSocketChannel.prepareSocket()  source:
  AsyncSocketChannel.java:358
       objects: 0xbd8e40d8 0xbd8e40d8 0xbd8e40d8
      bp: 0x000000007ac7b638  method: void com/ibm/io/async/Async
  SocketChannel.<init>(java.nio.channels.SocketChannel,com.ibm.io.
  AsyncSocketChannel.java:172
       objects: 0xb1f05bb8 0xbd8e3ec8 0xbd8e40d8
      bp: 0x000000007ac7b6a8  method:
  com.ibm.ws.tcpchannel.internal.SocketIOChannel com/ibm/ws/tcpch
  annel/internal/AioTCPChannel.createInboundSocketIOChannel(java.
  nio.channels.SocketChannel) source: AioTCPChannel.java:253
       objects: 0xbd8e40d8 0xb2805448 0xbd8e3ec8
      bp: 0x000000007ac7b750  method: boolean com/ibm/ws/tcpchann
  el/internal/NBAcceptChannelSelector.performRequest() source: NBA
       objects: 0xb20c3230 0xbd8e3e10 0xbd8e3ec8 0xb20c3230
  0xb2648338 0xbd8e3e10 0xbd8e3ec8
      bp: 0x000000007ac7b7d8  method: void
  com/ibm/ws/tcpchannel/internal/ChannelSelector.run()  source:
  ChannelSelector.java:259
       objects: 0xb20c3230
      bp: 0x000000007ac7b7f8  method: void java/lang/Thread.run()
  source: Thread.java:853
       objects: <no objects in this frame>
  
  ip verbx ledata 'nthreads(*) asid(nnn)'   shows exception in
  aio_prepare2
  
  20       CELQHROD    +00000266              CELQLIB
  
  21       aio_prepare2+0089783E              *PATHNAM
  Exception
  22       ZJ9SYM1     +00000000              *PATHNAM
  
  23       runJavaThread
  
                      +00000510              *PATHNAM
  
  24       javaProtectedThreadProc(J9PortLibrary*,void*)
  
                      +000001A6              *PATHNAM
  
  25       omrsig_protect
  
                      +0000046A              *PATHNAM
  
  26       javaThreadProc
  
                      +00000080              *PATHNAM
  
  27       thread_wrapper
  
                      +00000870              *PATHNAM
  
  28       CELQPCMM    +00000F68              CELQLIB
  
  
  
  The failing PSW address is in  the bbgzsafm DLL.   The
  routine that ABENDED is prepareConnection.
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED:  All users of IBM WebSphere Application      *
  *                  Server for z/OS                             *
  ****************************************************************
  * PROBLEM DESCRIPTION: ABEND0C4/ABENDS0C4 in                   *
  *                      prepareConnection when clearing         *
  *                      storage                                 *
  ****************************************************************
  0C4 abend in prepareConnection when clearing storage because the
  requested storage was not obtained. The failing PSW address is
  in the bbgzsafm DLL. The stack traceback shows java went native
  to aio_prepare2 which ends up calling prepareConnection.
  

Problem conclusion

• Updated the code to not clear storage if the storage was not
  obtained.
  
  The fix for this APAR is targeted for inclusion in WebSphere
  Liberty fix pack 26.0.0.2 For more information, see 'Recommended
  Updates for WebSphere Application Server':
  https://www.ibm.com/support/pages/node/715553
  

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:

Fix information

• Fixed component name

  LIBERTY PROF -

• Fixed component ID

  5655W6514

Applicable component levels