PI76874: FURTHER ENHANCEMENTS TO PI50937 HIGH CPU AVOIDANCE

Fixes are available

APAR status

Closed as program error.

Error description

PI50937 circumventions do not take effect until the user has opt
in with at least the environment variable
IHS_USE_RECVLOOP_PTHREAD_EXIT

Local fix

Problem summary

****************************************************************
* USERS AFFECTED:  Users of IBM HTTP Server (IHS)              *
*                  experiencing                                *
*                  high CPU usage.                             *
****************************************************************
* PROBLEM DESCRIPTION: A problem in the interaction between    *
*                      IHS                                     *
*                      and the Tivoli Global Security Kit      *
*                      (GSKit)                                 *
*                      may cause high CPU usage.               *
****************************************************************
* RECOMMENDATION:  Apply and enable this fix if directed by    *
*                  support.                                    *
****************************************************************
While the underlying cause is unknown, some failed SSL
handshakes
can cause high CPU usage to appear in httpd processes. In these
cases, the mustgather will show threads calling recv()
repeatedly
with secure_soc_init() in the backtrace.  strace/truss output
will
be very large and also show many calls to recv().

Problem conclusion

The circumventions first provided in PI50937 were greatly improv
and configuration via Apache directives instead of environment
variables was added.

Users must still opt-in to this circumvention with
"SSLRecvLoopMitigation ON". The IHS_USE_RECVLOOP_PTHREAD_EXIT
environment variable is still accepted but is deprecated.

If the circumvention is triggered, messages with the prefix
"PI50937" are issued.

This fix is targetted for IHS fixpacks:
 - 9.0.0.4
 - 8.5.5.12
 - 8.0.0.14

Temporary fix

Comments

APAR Information

APAR number
PI76874
Reported component name
IBM HTTP SERVER
Reported component ID
5724J0801
Reported release
800
Status
CLOSED PER
PE
NoPE
HIPER
NoHIPER
Special Attention
NoSpecatt / Xsystem
Submitted date
2017-02-20
Closed date
2017-03-22
Last modified date
2017-07-27

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
IBM HTTP SERVER
Fixed component ID
5724J0801

Applicable component levels

R800 PSY
UP
R900 PSY
UP

[{"Business Unit":{"code":"BU059","label":"IBM Software w\/o TPS"},"Product":{"code":"SSEQTJ","label":"IBM HTTP Server"},"Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"8.0","Line of Business":{"code":"LOB45","label":"Automation"}}]

Document Information

Modified date:
07 September 2022

Tips

PI76874: FURTHER ENHANCEMENTS TO PI50937 HIGH CPU AVOIDANCE

Fixes are available

Subscribe

APAR status

Closed as program error.

Error description

Local fix

Problem summary

Problem conclusion

Temporary fix

Comments

APAR Information

APAR number

Reported component name

Reported component ID

Reported release

Status

PE

HIPER

Special Attention

Submitted date

Closed date

Last modified date

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

Fixed component ID

Applicable component levels

R800 PSY

R900 PSY

Document Information

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