2076368 - Server crash, s_blockmap.cxx:2988 with stacktrace due to a problematic sql - SAP IQ

• Executing a simple query where the "case" expression is used as predicate may cause the server to crash.
• From IQ log you can see the following:

Exception Thrown from s_blockmap.cxx:2988, Err# 8, tid 1542 origtid 1542
O/S Err#: 0, ErrID: 2055 (s_bufman_exception); SQLCode: -1009047, SQLState: 'QSA47', Severity: 14
[20068]: main Bufman: Blockmap info error; bmp={bl=4,uid=1170416.............................
Exception Thrown from s_blockmap.cxx:2988, Err# 8, tid 7 origtid 1542
O/S Err#: 0, ErrID: 2055 (s_bufman_exception); SQLCode: -1009047, SQLState: 'QSA47', Severity: 14
[20068]: main Bufman: Blockmap info error; bmp={bl=4,uid=1170416.......................
Internal error: Unlocking a Buffer that is not locked.

**************************************************
***   Sybase IQ Abort:
***      From:  s_buf.cxx:656
***      PID: 6029456
***      Exception Location: 0x11cd49500
***      Error ID: 533,  Exception Type: hos_assertexception
***      Thread: 27757  (TID: 7, Original TID: 7)
***      Error #: 3,  O/S Error #: 0
**************************************************
...
The following exception is BUFMAN_BLOCKMAP_INFO_ERROR (-1009047)

from s_blockmap::GetBlockmapEntryInfo().
Blockmap Member Variables for 0x144fc13008 From s_barray.cxx:361
...

SAP IQ 15.3 GA

s_blockmap.cxx:2988, Case predicate   , KBA , BC-SYB-IQ , Sybase IQ , Problem