Fixes are available
APAR status
Closed as program error.
Error description
System hang may occur on AIX.
Local fix
N/A
Problem summary
**************************************************************** * USERS AFFECTED: IBM WebSphere Application Server Load * * Balancer for IPv4 and IPv6 users on AIX * **************************************************************** * PROBLEM DESCRIPTION: System may hang. * **************************************************************** * RECOMMENDATION: * **************************************************************** If a dump is taken during the hang situation, multiple CPUs will show stacks containing os_mutex_lock, os_packetxmit, lbarp_send near the top on at least two CPUs.
Problem conclusion
The Load Balancer for IPv4 and IPv6 was enabling a lock before transmitted a packet and no kernel locks should be held open when transmitting a packet. Code has been corrected to release the lock before transmitting. Fix pack levels: 8.5.5.17 9.0.5.2
Temporary fix
Comments
APAR Information
APAR number
PH15294
Reported component name
WS EDGE LB IPV4
Reported component ID
5724H8812
Reported release
900
Status
CLOSED PER
PE
NoPE
HIPER
NoHIPER
Special Attention
NoSpecatt / Xsystem
Submitted date
2019-08-05
Closed date
2019-09-12
Last modified date
2019-09-12
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
WS EDGE LB IPV4
Fixed component ID
5724H8812
Applicable component levels
R850 PSY
UP
R900 PSY
UP
[{"Business Unit":{"code":"BU053","label":"Cloud & Data Platform"},"Product":{"code":"SSEQTP","label":"WebSphere Application Server"},"Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"900","Line of Business":{"code":"LOB45","label":"Automation"}}]
Document Information
Modified date:
17 October 2021