IT28329: CRASHES POSSIBLE WITH QUERIES ON ATS/RIS RELATED SMI TABLES

APAR status

• Closed as program error.

Error description

• Queries on sysmaster's  syscdr_ats, syscdr_atsdir, syscdr_ris or
  syscdr_risdir SMI tables, esp. when done in parallel by multiple
  sessions, have a potential to crash the database server, in
  threads named ATSt*, e.g. "ATSt536".
  Most likely source of such queries would be certain ats/ris
  related 'cdr view' commands, possibly originating from OAT.
  
  Stacks seen on Linux were of little help for diagnosing this as
  they only showed top part which usually was in some glibc
  malloc() or free() related functions, typically with
  malloc_printerr() and/or __libc_message() followed by
  __GI_abort() indicating a glibc forced shutdown using signal 6
  -- SIGABRT (hence some OS patch level dependency might exist).
  
  The condition for this kind of crash is the existence of more
  than one 'cdrsmi' VP (with the crash occurring on one of them).
  A 'cdrsmi' VP typically gets auto-created for first such query
  and any subsequent query would be using this VP, with the code
  depending on always running on same VP.  Unfortunately such
  thread isn't kept from migrating between such VPs and it's not
  guaranteed that auto-creation of such VP doesn't happen multiple
  times in parallel, so there's a small chance for ending up with
  two such VPs and threads eventually migrating.
  

Local fix

• To avoid this problem, simply pre-configure exactly one 'cdrsmi'
  VP in onconfig:  VPCLASS cdrsmi,num=1
  

Problem summary

• ****************************************************************
  * USERS AFFECTED:                                              *
  * Users of IDS prior to 12.10.xC13.                            *
  ****************************************************************
  * PROBLEM DESCRIPTION:                                         *
  * Crashes possible with queries on ATS/RIS related SMI tables. *
  ****************************************************************
  * RECOMMENDATION:                                              *
  ****************************************************************
  

Problem conclusion

• Fixed in IDS 12.10.xC13.
  

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