On Tue, Sep 29, 2009 at 09:52:06PM +0530, kunal sharma wrote: > Hi , > We are using Postgres 8.4 and its been found going into recovery > mode couple of times. The server process seems to fork another child process > which is another postgres server running under same data directory and after > some time it goes away while the old server is still running. There were few > load issues on the server but the load didnt went above "32". > > We are running opensuse 10.2 x86_64 with 32Gb of physical memory. > Checking the logs I found that theres a segmentation fault , > > > Sep 26 05:39:54 pace kernel: postgres[28694]: segfault at 0000000000000030 > rip 000000000066ba8c rsp 00007fffd364da30 error 4 > > gdb dump shows this > > Reading symbols from /lib64/libdl.so.2...done. > Loaded symbols for /lib64/libdl.so.2 > Reading symbols from /lib64/libm.so.6...done. > Loaded symbols for /lib64/libm.so.6 > Reading symbols from /lib64/libc.so.6...done. > Loaded symbols for /lib64/libc.so.6 > Reading symbols from /lib64/ld-linux-x86-64.so.2...done. > Loaded symbols for /lib64/ld-linux-x86-64.so.2 > Reading symbols from /lib64/libnss_files.so.2...done. > Loaded symbols for /lib64/libnss_files.so.2 > 0x00002ad6d7b8c2b3 in __select_nocancel () from /lib64/libc.so.6 > (gdb) > > Any suggestions what is causing this segmentation fault?
I work with Kunal and have been looking into this. It appears to be the same as the bug described in: http://archives.postgresql.org/pgsql-bugs/2009-09/msg00355.php as I have localized it to a NULL pointer deference in RelationCacheInitializePhase2() as well. Tom speculates in: http://archives.postgresql.org/pgsql-bugs/2009-09/msg00372.php that large numbers of table drops might trigger this. The system in question creates and drops temp tables at a high rate which tends to confirm this. -dg -- David Gould da...@sonic.net 510 536 1443 510 282 0869 If simplicity worked, the world would be overrun with insects. -- Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers
