APAR status
Closed as program error.
Error description
Under some workloads where TCPIP connections are either unreliable or there is a large amount of socket openign and closing then it is possible to hit a deadlock in the TCPIP Nodes due to taking locks in an incorrect order. Examining a java core file will show one or more threads blocked in WaitingForReadDataState.getReadyConnections or AvailableForReadState.forceToCloseState and one or more threads blocked in Connection.giveBackRead.
Local fix
Problem summary
**************************************************************** USERS AFFECTED: All users of IBM Integration Bus version 10 or App Connect Enterprise v11 using the TCP/IP Nodes. Platforms affected: MultiPlatform **************************************************************** PROBLEM DESCRIPTION: <span style="background-color:rgb(255, 255, 255)">Under some workloads where TCPIP connections are either </span><span style="background-color:rgb(255, 255, 255)">unreliable or there is a large amount of socket opening and </span><span style="background-color:rgb(255, 255, 255)">closing then it is possible to hit a deadlock in the TCPIP </span><span style="background-color:rgb(255, 255, 255)">Nodes due to taking locks in an incorrect order. Examining a </span><span style="background-color:rgb(255, 255, 255)">java core file will show one or more threads blocked in </span><span style="background-color:rgb(255, 255, 255)">WaitingForReadDataState.getReadyConnections or </span><span style="background-color:rgb(255, 255, 255)">AvailableForReadState.forceToCloseState and one or more threads </span><span style="background-color:rgb(255, 255, 255)">blocked in Connection.giveBackRead. </span>
Problem conclusion
Locks are now taken in the correct order so the deadlock no longer occurs. --------------------------------------------------------------- The fix is targeted for delivery in the following PTFs: Version Maintenance Level v10.0 10.0.0.19 v11.0 11.0.0.7 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
IT28579
Reported component name
INTEGRATION BUS
Reported component ID
5724J0540
Reported release
A00
Status
CLOSED PER
PE
NoPE
HIPER
NoHIPER
Special Attention
NoSpecatt / Xsystem
Submitted date
2019-03-26
Closed date
2019-12-18
Last modified date
2019-12-18
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
INTEGRATION BUS
Fixed component ID
5724J0540
Applicable component levels
[{"Business Unit":{"code":"BU053","label":"Cloud & Data Platform"},"Product":{"code":"SSNQK6","label":"IBM Integration Bus"},"Component":"","ARM Category":[],"Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"10.0","Edition":"","Line of Business":{"code":"LOB45","label":"Automation"}}]
Document Information
Modified date:
18 December 2019