IT39230: 'ONMODE -C BLOCK' COMMAND HANGS ALONG WITH THE SERVER, WITH ONMODE_MON WAITING FOREVER ON A BUFFER

APAR status

• Closed as program error.

Error description

• The symptom is that 'onmode -c block' hangs waiting for a buffer
  whose owner is -1, as in:
  
  onstat -b
  
  IBM Informix Dynamic Server Version 14.10.FC7 -- On-Line -- Up
  00:17:16 -- 219652 Kbytes
  Blocked:ARCHIVE
  
  Buffers
  address           userthread        flgs pagenum
  memaddr           nslots pgflgs xflgs owner             waitlist
  lru prio    acsfreq
  
  Buffer pool page size: 2048
  46555d68         0                100086 2:0
  4969d000         0      1000   0     ffffffffffffffff 45c1a8c8
  10    0          0
   0 modified, 70000 total, 131072 hash buckets, 2048 buffer size
  
  This problem also applies to versions of Informix with the fix
  for APAR IT37120.
  

Local fix

• A potential workaround is to pre-load page zero for all chunks
  into the buffer pool prior to running the "onmode -c block"
  command. This can be achieved by running "oncheck -pP <chunk
  num> 0" for each chunk.
  

Problem summary

• ****************************************************************
  * USERS AFFECTED:                                              *
  * Users of Informix Server prior 14.10.xC7W1.                  *
  ****************************************************************
  * PROBLEM DESCRIPTION:                                         *
  * See Error Description                                        *
  ****************************************************************
  * RECOMMENDATION:                                              *
  * Upgrade to Informix Server 14.10.xC7W1 or higher.            *
  ****************************************************************
  

Problem conclusion

• Fixed in Informix Server 14.10.xC7W1.
  

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