Informix - Problem description
Problem IT28329 | Status: Closed |
CRASHES POSSIBLE WITH QUERIES ON ATS/RIS RELATED SMI TABLES | |
product: | |
INFORMIX SERVER / 5725A3900 / C10 - IDS 12.10 | |
Problem description: | |
Queries on sysmaster's syscdr_ats, syscdr_atsdir, syscdr_ris or syscdr_risdir SMI tables, esp. when done in parallel by multiple sessions, have a potential to crash the database server, in threads named ATSt*, e.g. "ATSt536". Most likely source of such queries would be certain ats/ris related 'cdr view' commands, possibly originating from OAT. Stacks seen on Linux were of little help for diagnosing this as they only showed top part which usually was in some glibc malloc() or free() related functions, typically with malloc_printerr() and/or __libc_message() followed by __GI_abort() indicating a glibc forced shutdown using signal 6 -- SIGABRT (hence some OS patch level dependency might exist). The condition for this kind of crash is the existence of more than one 'cdrsmi' VP (with the crash occurring on one of them). A 'cdrsmi' VP typically gets auto-created for first such query and any subsequent query would be using this VP, with the code depending on always running on same VP. Unfortunately such thread isn't kept from migrating between such VPs and it's not guaranteed that auto-creation of such VP doesn't happen multiple times in parallel, so there's a small chance for ending up with two such VPs and threads eventually migrating. | |
Problem Summary: | |
**************************************************************** * USERS AFFECTED: * * Users of IDS prior to 12.10.xC13. * **************************************************************** * PROBLEM DESCRIPTION: * * Crashes possible with queries on ATS/RIS related SMI tables. * **************************************************************** * RECOMMENDATION: * **************************************************************** | |
Local Fix: | |
To avoid this problem, simply pre-configure exactly one 'cdrsmi' VP in onconfig: VPCLASS cdrsmi,num=1 | |
Solution | |
Workaround | |
not known / see Local fix | |
Timestamps | |
Date - problem reported : Date - problem closed : Date - last modified : | 06.03.2019 03.10.2019 03.10.2019 |
Problem solved at the following versions (IBM BugInfos) | |
12.10.xC13 | |
Problem solved according to the fixlist(s) of the following version(s) |