IT14768: RUNNING ARCHECKER AGAINST ARCHIVE OF SYSTEM WITH SMART BLOB SPACES CAN CORE DUMP AND/OR RESULT IN ERROR MESSAGES IN AC_MSGPATH

APAR status

• Closed as program error.

Error description

• If you try to archecker an archive with smart blob data, it's
  possible for archecker to look at pages it shouldn't be which
  can cause core dumps in archecker or other various odd messages
  like these in the AC_MSGPATH file:
  
  STATUS: Tape type:      Archive Backup Tape
  STATUS: OnLine version: IBM Informix Dynamic Server Version
  11.50.FC9W3XO
  STATUS: Archive date:   Thu Jan  7 12:49:37 2016
  STATUS: Archive level:  0
  STATUS: Tape blocksize:  1048576
  STATUS: Tape size:  -1778384896
  STATUS: Tape number in series:  3
  TIME: [2016-01-20 20:16:59] Phys Tape 3 started
  ERROR: Invalid chunk number 0
  ERROR: Invalid chunk number 0
  ERROR: Invalid chunk number 0
  ERROR: Skipping page -18513_-1674088741, bad chunk number
  ERROR: Invalid chunk number 23917
  
  The stack trace for archecker when it core dumped when looking
  at a page was this:
  
  
  arc_tstbit()
  arc_mark_page()
  Arc_process_page()
  Arc_Scan_Tapes()
  arc_check_level()
  main()
  
  This was due to an unfortunately valid chunk number in what
  archecker thought was a page header, but the offset was larger
  then the chunk which caused it to try and access the bitmap out
  of bounds which caused a SEGV and thus produce a core file.
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED:                                              *
  * IDS users who run archecker to validate archives with smart  *
  * blob spaces configured                                       *
  ****************************************************************
  * PROBLEM DESCRIPTION:                                         *
  * See Error Description                                        *
  ****************************************************************
  * RECOMMENDATION:                                              *
  * Update to IBM Informix Server 11.50.xC10                     *
  ****************************************************************
  

Problem conclusion

• Problem Fixed In IBM Informix Server 11.50.xC10
  

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:

Fix information

• Fixed component name

  INFORMIX SERVER

• Fixed component ID

  5725A3900

Applicable component levels

• RB50 PSN

     UP

• RB50 PSY

     UP