On Mon, Jun 6, 2011 at 3:43 AM, HuangQi <huangq...@gmail.com> wrote: > Hi, > I was using gdb to debug postgres. In order to debug the backend of > running query, I start postgres first and use "select * from > pg_backend_pid()" to ask for backend pid. Then I start gdb in another bash > window with "gdb postgres" and attach the pid obtained above and set the > breakpoint. Then I run the query from the first window. However, the > debugging precess which is shown below is not going to the breakpoint. I > tried many different breakpoints, but it always start from the 305 > client_read_ended(). > > GNU gdb 6.6 > Copyright (C) 2006 Free Software Foundation, Inc. > GDB is free software, covered by the GNU General Public License, and you are > welcome to change it and/or distribute copies of it under certain > conditions. > Type "show copying" to see the conditions. > There is absolutely no warranty for GDB. Type "show warranty" for details. > This GDB was configured as "sparc-sun-solaris2.10"... > (gdb) b qp_add_paths_to_joinrel > Breakpoint 1 at 0x1a6744: file joinpath.c, line 67. > (gdb) attach 23903 > Attaching to program `/usrlocal/pgsql/bin/postgres', process 23903 > Retry #1: > Retry #2: > Retry #3: > Retry #4: > [New LWP 1] > 0xff0cbaa4 in _rt_boot () from /usr/lib/ld.so.1 > (gdb) n > Single stepping until exit from function _rt_boot, > which has no line number information. > secure_read (port=0x4a7760, ptr=0x455948, len=8192) at be-secure.c:305 > 305 client_read_ended(); > (gdb) n > pq_recvbuf () at pqcomm.c:767 > 767 if (r < 0) > (gdb) n > 769 if (errno == EINTR) > (gdb) n > 782 if (r == 0) > (gdb) n > 788 return EOF; > (gdb) n > 791 PqRecvLength += r; > (gdb) > Any one know what is going wrong? BTW, as you can see, the system is > solaris.
Perhaps you want "c" for "continue" rather than "n" for "next". -- Robert Haas EnterpriseDB: http://www.enterprisedb.com The Enterprise PostgreSQL Company -- Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers
