IC62043: EXECUTING GENXMLQUERYCLOB OR GENXMLQUERY FUNCTIONS MAY CAUSE THEENGINE TO CRASH OR CORRUPT MEMORY

APAR status

• Closed as program error.

Error description

• When you execute the genxmlqueryclob or genxmlquery functions,
  memory corruption may occur and cause the engine to crash or bad
  XML output to be generated.
  
  Example of bad XML generated:
  
  <row>
  <id>18</id>
  <some_code>TAG2</some_code>
  <layer_name>Example layer</layer_name>
  <mandatory>N</mandatory>
  <special_order>40</special_order>
  <special_func>SomeFunc</special_func>
  <code>FUNC</code>
  <feature_hideable>t</feature_hideab<row>  <--- here you see a
  bad closing tag
  <id>19</id>
  <some_code>TAG2</some_code>
  ...
  
  In the case of an engine crash you may see the following stack
  trace:
  
  oninit :: add_to_list
  oninit :: mt_shm_malloc_segid
  oninit :: mt_realloc
  oninit :: mi_realloc
  oninit :: genxmlautoelem
  oninit :: genxmlqueryclob
  oninit :: udrlm_clang_execute_internal
  oninit :: udrlm_clang_execute
  oninit :: udrlm_exec_routine
  oninit :: udr_execute
  oninit :: exroutine
  oninit :: geval
  oninit :: evalcols
  oninit :: runudr
  oninit :: ip_curnext
  oninit :: ip_fetch
  oninit :: getrow
  oninit :: fetchrow
  oninit :: exfetch
  oninit :: sql_nfetch
  oninit :: sq_nfetch
  oninit :: sqmain
  oninit :: listen_verify
  oninit :: spawn_thread
  oninit :: startup
  
  The query may also return a -9791 error
  
   9791: User Defined Routine (genxmlqueryclob) execution failed.
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED:                                              *
  * Applications using XML publishing functions like             *
  * genxmlqueryclob or genxmlquery                               *
  ****************************************************************
  * PROBLEM DESCRIPTION:                                         *
  * This is a case of memory corruption and can cause the server *
  * to abend or even hang indefinitely.                          *
  ****************************************************************
  * RECOMMENDATION:                                              *
  * Upgrade to IDS 11.50.xC6 and above.                          *
  ****************************************************************
  

Problem conclusion

• Problem first fixed in IDS 11.50.xC6.
  

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

  IBM IDS ENTRP E

• Fixed component ID

  5724L2304

Applicable component levels

• RB15 PSY

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