APAR status
Closed as program error.
Error description
The integration servers running TCP flows might become unresponsive because of deadlock. A javacore collected at the time of issue shows following callstack with deadlock situation. 1st thread: "Blocked on: com/ibm/broker/tcpip/ClientReadyForReadState@0x00000000F0489B88 Owned by: "Thread-34" (J9VMThread:0x0000000002FE8200, java/lang/Thread:0x00000000F03D50C0) Heap bytes allocated since last GC cycle=2691760 (0x2912B0) Java callstack: at com/ibm/broker/tcpip/ReadyForReadState.remove(ReadyForR eadState.java:251(CompiledCode)) (entered lock: com/ibm/broker/tcpip/ClientReadyForReadState@0x00000000F0489B88, entry count: 1) at com/ibm/broker/tcpip/Connection.waitForData(Connection. java:1995(CompiledCode)) (entered lock: java/lang/Object@0x00000000F04E3B60, entry count: 1)" 2nd thread: "Blocked on: java/lang/Object@0x00000000F04E3B60 Owned by: "Thread-32" (J9VMThread:0x0000000002FBB200, java/lang/Thread:0x00000000F03D4FC0) Heap bytes allocated since last GC cycle=12288 (0x3000) Java callstack: at com/ibm/broker/tcpip/Connection.setReadReadyState(Conne ction.java:1892(CompiledCode)) (entered lock: com/ibm/broker/tcpip/ClientReadyForReadState@0x00000000F0489B88, entry count: 2)"
Local fix
Problem summary
**************************************************************** USERS AFFECTED: <span style="background-color:rgb(255, 255, 255)">All users of IBM App Connect Enterprise V12.0.11.0 using the TCPIP nodes.</span> Platforms affected: MultiPlatform **************************************************************** PROBLEM DESCRIPTION: Multiple instances of concurrently running TCPIP flows may encounter deadlock situations, causing integration servers to become unresponsive. The Java core captured will show the deadlock situation for two threads with following call stack at the top. Thread-1 stack: 3XMTHREADBLOCK Blocked on: com/ibm/broker/tcpip/ClientReadyForReadState@0x00000000F0489B88 Owned by: "Thread-34" (J9VMThread:0x0000000002FE8200, java/lang/Thread:0x00000000F03D50C0) 3XMHEAPALLOC Heap bytes allocated since last GC cycle=2691760 (0x2912B0) 3XMTHREADINFO3 Java callstack: 4XESTACKTRACE at com/ibm/broker/tcpip/ReadyForReadState.remove(ReadyForReadState. java:251(Compiled Code)) 5XESTACKTRACE (entered lock: com/ibm/broker/tcpip/ClientReadyForReadState@0x00000000F0489B88, entry count: 1) 4XESTACKTRACE at com/ibm/broker/tcpip/Connection.waitForData(Connection.java:1995 (Compiled Code)) 5XESTACKTRACE (entered lock: java/lang/Object@0x00000000F04E3B60, entry count: 1) 4XESTACKTRACE at com/ibm/broker/tcpip/ReadyForReadState.getConnection(ReadyForRea dState.java:160(Compiled Code)) Thread-2 stack: 3XMTHREADBLOCK Blocked on: java/lang/Object@0x00000000F04E3B60 Owned by: "Thread-32" (J9VMThread:0x0000000002FBB200, java/lang/Thread:0x00000000F03D4FC0) 3XMHEAPALLOC Heap bytes allocated since last GC cycle=12288 (0x3000) 3XMTHREADINFO3 Java callstack: 4XESTACKTRACE at com/ibm/broker/tcpip/Connection.setReadReadyState(Connection.jav a:1892(Compiled Code)) 5XESTACKTRACE (entered lock: com/ibm/broker/tcpip/ClientReadyForReadState@0x00000000F0489B88, entry count: 2) 4XESTACKTRACE at com/ibm/broker/tcpip/WaitingForReadDataState.getReadyConnections (WaitingForReadDataState.java:225(Compiled Code)) 5XESTACKTRACE (entered lock: java/lang/Object@0x00000000F0489BB0, entry count: 1) 5XESTACKTRACE (entered lock: com/ibm/broker/tcpip/ClientReadyForReadState@0x00000000F0489B88, entry count: 1)
Problem conclusion
The product no more causes deadlock situation with TCPIP message flows. --------------------------------------------------------------- The fix is targeted for delivery in the following PTFs: Version Maintenance Level v12.0 12.0.12.0 The latest available maintenance can be obtained from: http://www-01.ibm.com/support/docview.wss?rs=849&uid=swg27006041 If the maintenance level is not yet available,information on its planned availability can be found on: http://www-1.ibm.com/support/docview.wss?rs=849&uid=swg27006308 ---------------------------------------------------------------
Temporary fix
Comments
APAR Information
APAR number
IT45685
Reported component name
APP CONNECT ENT
Reported component ID
5724J0560
Reported release
C00
Status
CLOSED PER
PE
NoPE
HIPER
NoHIPER
Special Attention
NoSpecatt / Xsystem
Submitted date
2024-03-12
Closed date
2024-03-28
Last modified date
2024-03-28
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
APP CONNECT ENT
Fixed component ID
5724J0560
Applicable component levels
[{"Business Unit":{"code":"BU048","label":"IBM Software"},"Product":{"code":"SSDR5J","label":"IBM App Connect Enterprise"},"Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"C00","Line of Business":{"code":"LOB67","label":"IT Automation \u0026 App Modernization"}}]
Document Information
Modified date:
04 April 2024