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Informix - Problem description

Problem IT32830 Status: Closed

Select substring op [] on views w/ queries using substring ops [] on *char
types can produce unpredictable results/crashes

product:
INFORMIX SERVER / 5725A3900 / E10 - 
Problem description:
13:12:26  Found during mt_shm_malloc_segid 6
13:12:26  Pool '50.H.ext' (0x700000023f26040)
13:12:26  Bad block header 0x700000023d62850

0700000023d62850: 0e000000 47c820f9 ffff0000 00002888   ....G. .
......(.
0700000023d62860: 07000000 23f260a8 07000000 23d627a0   ....#.`.
....#.'.
0700000023d62870: 00000000 000007b0 00000000 00000000   ........
........
0700000023d62880: 00000000 00000000 0e000000 47e4c1d1   ........
....G...

The above checkword should be 0xe00000047c88ff9 so it has had
one byte of 0x20 overwriting 0x0700000023d62856.

The lower portion of the stack may differ but from new_val seems
to be consistent when seeing the problem.

0x00000001000b5250 (oninit)afstack
0x00000001000b3fa0 (oninit)afhandler
0x00000001000b4498 (oninit)affail_interface
0x000000010004bd50 (oninit)mt_shm_malloc_segid
0x000000010004b78c (oninit)mt_malloc
0x000000010019c9bc (oninit)rh_alloc
0x00000001001a4c10 (oninit)tmalloc
0x00000001004c1c50 (oninit)geval
0x00000001004c206c (oninit)geval
0x00000001005069c4 (oninit)ev_geval
0x00000001004fbc20 (oninit)new_eval
0x00000001009977a4 (oninit)scan_filter
0x0000000101179798 (oninit)physical_scan
0x000000010117ade4 (oninit)rsseqscan_read
0x00000001007b141c (oninit)fmseqscan_read
0x00000001009a9784 (oninit)readseq_batch
0x000000010099f1e0 (oninit)gettupl
0x0000000100995704 (oninit)scan_next
0x00000001015b9490 (oninit)merge_next
0x00000001015b9b3c (oninit)merge_next
0x00000001015b9b3c (oninit)merge_next
0x00000001015b9b3c (oninit)merge_next
0x00000001015b9b3c (oninit)merge_next
0x00000001015b9b3c (oninit)merge_next
0x00000001015b9b3c (oninit)merge_next
0x00000001015b9b3c (oninit)merge_next
0x00000001015b9b3c (oninit)merge_next
0x00000001015b9b3c (oninit)merge_next
0x00000001015b9b3c (oninit)merge_next
0x00000001015b9b3c (oninit)merge_next
0x00000001015b9b3c (oninit)merge_next
0x00000001015b9b3c (oninit)merge_next
0x00000001015b9b3c (oninit)merge_next
0x00000001015b9b3c (oninit)merge_next
0x00000001015b9b3c (oninit)merge_next
0x00000001015b9b3c (oninit)merge_next
0x00000001015b9b3c (oninit)merge_next
0x00000001015b44f0 (oninit)sort_open
0x000000010099bc54 (oninit)filltemp
0x00000001009949b4 (oninit)scan_open
0x00000001009b2c8c (oninit)IPRA.$materialize_viewtmp
0x00000001009b523c (oninit)materialize_viewtmp
0x000000010108a62c (oninit)prepselect
0x00000001006d9504 (oninit)open_cursor
0x00000001006d9ca4 (oninit)sql_open
0x00000001006d99fc (oninit)sq_open
0x000000010076b8ac (oninit)sqmain
Problem Summary:
****************************************************************
* USERS AFFECTED:                                              *
* Users of Informix Server prior to 14.10.xC5.                 *
****************************************************************
* PROBLEM DESCRIPTION:                                         *
* See Error Description                                        *
****************************************************************
* RECOMMENDATION:                                              *
* Update to Informix Server 14.10.xC5.                         *
****************************************************************
This contains a fix for CHAR, NCHAR and LVARCHAR types
Local Fix:
Solution
Workaround
not known / see Local fix
Timestamps
Date  - problem reported    :
Date  - problem closed      :
Date  - last modified       :
12.05.2020
07.12.2020
07.12.2020
Problem solved at the following versions (IBM BugInfos)
Problem solved according to the fixlist(s) of the following version(s)
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