IT01697: ERROR CODE PATH IN MGM_GETMEM CAN LEAVE THE MGM MUTEX LOCKED

APAR status

• Closed as program error.

Error description

• It appears possible if a particular error occurs in mgm_getmem()
  the pdq query could fail and return a 208 error, but in the
  process it would leave the MGM mutex locked so any further calls
  which need to grab the MGM mutex all hang as the mutex is never
  released.
  
  Here's onstat -g lmx output which shows the owner of the MGM
  mutex also waiting to grab it again:
  
  Mutexes with waiters:
  mid      addr             name               holder   lkcnt
  waiter   waittime
  4357     c000000305446420 MGM mutex          3917     0
  3929     5199
  
  3917     5196
  
  3935     5186
  
  3938     5177
  
  421      5174
  
  3961     5152
  
  3969     5148
  
  4012     5137
  
  4106     5068
  
  2526     5023
  ...
  
  From the above you can see that thread 3917 both is reported as
  owning the MGM mutex but on the 2nd.
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED:                                              *
  * Users running queries which consume large memory.            *
  ****************************************************************
  * PROBLEM DESCRIPTION:                                         *
  * See Error Description                                        *
  ****************************************************************
  * RECOMMENDATION:                                              *
  * Update to IDS-11.70.xC9                                      *
  ****************************************************************
  

Problem conclusion

• Problem Fixed In IDS-11.70.xC9
  

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

• RA10 PSN

     UP