PK22485: IHS MEMORY LEAK IF FILES BEING SERVED ARE TRUNCATED

PK65782; 2.0.47.1: IBM HTTP Server V2.0.47 Cumulative Interim Fix

APAR status

• Closed as program error.

Error description

• IHS memory leak if files being served are truncated
  

Local fix

• Do not modify static files while the webserver processes is
  running.
  

Problem summary

• A file was truncated while mod_include was
  reading the file.  The EOF error was not signalled to the
  caller, and it kept reading from the end of the file,
  allocating storage each time, resulting in a fast-growing
  memory leak.
  Secondarily, when the support library aprutil was changed to
  return an error to mod_include, an I/O error code could be
  logged for the request in the access log, instead of the HTTP
  response code.
  Additional symptom: 100% CPU in a worker process until
  all memory is consumed.
  

Problem conclusion

• The support library apr-util was changed
  to report an error to the caller when an EOF was encountered.
  This is the error condition triggered when a file is truncated
  while being read by mod_include and mmap is disabled.
  The normal file handler was modified to report 500 in the
  condition where mod_include reports an error due to the EOF
  condition.
  

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:

Modules/Macros

• APRUTIL  HTTPD
  

Fix information

• Fixed component name

  IBM HTTP SERVER

• Fixed component ID

  5724J0801

Applicable component levels

• R60A PSN

     UP

• R60H PSN

     UP

• R60P PSN

     UP

• R60I PSN

     UP

• R60S PSN

     UP

• R60W PSN

     UP

• R60Z PSN

     UP