Hi All,
While running test with bind varible getting segmentation fault. ( CVS Head 8.4)
For testcase, please find the crash.c (C test) and test.java ( JDBC test) attached with the mail.
Had a quick look at the core dump and found the call stack for the segmentation fault.
(gdb) bt
#0 0x0813768d in analyze_requires_snapshot (parseTree=0x0) at analyze.c:270
#1 0x082e77a8 in exec_bind_message (input_message=0xbfd7d73c) at postgres.c:1698
#2 0x082ec524 in PostgresMain (argc=4, argv=0x916fc70, username=0x916fb7c "rushabh") at postgres.c:4882
#3 0x082ac10a in BackendRun (port=0x9191b18) at postmaster.c:3309
#4 0x082ab4d4 in BackendStartup (port=0x9191b18) at postmaster.c:2881
#5 0x082a8ae1 in ServerLoop () at postmaster.c:1291
Had a look at the previous version and found that because of following condition added with the new PG merge into exec_bind_message(); we end up with the segmentation fault.
exec_bind_message{
...
/*
* Set a snapshot if we have parameters to fetch (since the input
* functions might need it) or the query isn't a utility command (and
* hence could require redoing parse analysis and planning).
*/
if (numParams > 0 || analyze_requires_snapshot(psrc->raw_parse_tree))
{
PushActiveSnapshot(GetTransactionSnapshot());
snapshot_set = true;
}
...
}
Condition added with "Fix failure to ensure that a snapshot is available to datatype input functions" commit. (
http://git.postgresql.org/?p=postgresql.git;a=commitdiff;h=d5e7e5dd7c81440bb46f52872906633ee2b388c1)
Not very much sure
but for the quick check I just modifiled condition by added check for raw_parse_tree and test worked file.
Modified condition:
/*
* Set a snapshot if we have parameters to fetch (since the input
* functions might need it) or the query isn't a utility command (and
* hence could require redoing parse analysis and planning).
*/
if (numParams > 0 ||
(psrc->raw_parse_tree && analyze_requires_snapshot(psrc->raw_parse_tree)))
{
PushActiveSnapshot(GetTransactionSnapshot());
snapshot_set = true;
}
Another fix would be to add check for parseTree into analyze_requires_snapshot().
Thanks ,
Rushabh Lathia
www.EnterpriseDB.com
