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Re: Hung postmaster (8.3.9)

From: "Ed L(dot)" <pgsql(at)bluepolka(dot)net>
To: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
Cc: pgsql-general(at)postgresql(dot)org
Subject: Re: Hung postmaster (8.3.9)
Date: 2010-03-02 00:12:36
Message-ID: 201003011712.36903.pgsql@bluepolka.net (view raw or flat)
Thread:
Lists: pgsql-generalpgsql-hackers
On Monday 01 March 2010 @ 16:49, Tom Lane wrote:
> 
> Oh, for some reason I thought it was sitting idle.  That
>  sounds more like an infinite loop.  Try reattaching to the
>  postmaster, confirm the stack trace, and then see how many
>  times you can do "fin" before it doesn't return control. 
>  That will tell us which level of subroutine is looping.

Yeah, it took me a bit to notice it was at 100% cpu.  Here's
gdb output with the 'fin's you suggested:

$ gdb `which postgres`
GNU gdb Fedora (6.8-37.el5)
Copyright (C) 2008 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.  Type "show copying"
and "show warranty" for details.
This GDB was configured as "x86_64-redhat-linux-gnu"...
(gdb) attach 21670
Attaching to program: /opt/pgsql/installs/postgresql-8.3.9/bin/postgres, process 21670
Reading symbols from /lib64/libcrypt.so.1...done.
Loaded symbols for /lib64/libcrypt.so.1
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
0x000000346f8c43a0 in __read_nocancel () from /lib64/libc.so.6
(gdb) bt
#0  0x000000346f8c43a0 in __read_nocancel () from /lib64/libc.so.6
#1  0x000000346f86c747 in _IO_new_file_underflow () from /lib64/libc.so.6
#2  0x000000346f86d10e in _IO_default_uflow_internal () from /lib64/libc.so.6
#3  0x000000346f8689cb in getc () from /lib64/libc.so.6
#4  0x0000000000531ee8 in next_token (fp=0x11da7f30, buf=0x7fff5cb9e300 "", bufsz=4096) at hba.c:128
#5  0x0000000000532233 in tokenize_file (filename=0x11da5940 "global", file=0x11da7f30, lines=0x7fff5cb9e598, line_nums=0x7fff5cb9e590) at hba.c:232
#6  0x00000000005322e9 in tokenize_file (filename=0x11da5920 "global/pg_auth", file=0x11da7cf0, lines=0x98b168, line_nums=0x98b170) at hba.c:358
#7  0x00000000005327ff in load_role () at hba.c:959
#8  0x000000000057f300 in reaper (postgres_signal_arg=<value optimized out>) at postmaster.c:2145
#9  <signal handler called>
#10 0x000000346f8cb323 in __select_nocancel () from /lib64/libc.so.6
#11 0x000000000057cc33 in ServerLoop () at postmaster.c:1236
#12 0x000000000057dfdf in PostmasterMain (argc=6, argv=0x11d8afb0) at postmaster.c:1031
#13 0x00000000005373de in main (argc=6, argv=<value optimized out>) at main.c:188
(gdb) fin
Run till exit from #0  0x000000346f8c43a0 in __read_nocancel () from /lib64/libc.so.6
0x000000346f86c747 in _IO_new_file_underflow () from /lib64/libc.so.6
(gdb) fin
Run till exit from #0  0x000000346f86c747 in _IO_new_file_underflow () from /lib64/libc.so.6
0x000000346f86d10e in _IO_default_uflow_internal () from /lib64/libc.so.6
(gdb) fin
Run till exit from #0  0x000000346f86d10e in _IO_default_uflow_internal () from /lib64/libc.so.6
0x000000346f8689cb in getc () from /lib64/libc.so.6
(gdb) fin
Run till exit from #0  0x000000346f8689cb in getc () from /lib64/libc.so.6
0x0000000000531ee8 in next_token (fp=0x11da7f30, buf=0x7fff5cb9e300 "", bufsz=<value optimized out>) at hba.c:128
128		while ((c = getc(fp)) != EOF && (pg_isblank(c) || c == ','))
(gdb) fin
Run till exit from #0  0x0000000000531ee8 in next_token (fp=0x11da7f30, buf=0x7fff5cb9e300 "", bufsz=<value optimized out>) at hba.c:128
0x0000000000532233 in tokenize_file (filename=0x11da5940 "global", file=0x11da7f30, lines=0x7fff5cb9e598, line_nums=0x7fff5cb9e590) at hba.c:232
232			if (!next_token(file, buf, sizeof(buf)))
Value returned is $1 = 0 '\0'
(gdb) fin
Run till exit from #0  0x0000000000532233 in tokenize_file (filename=0x11da5940 "global", file=0x11da7f30, lines=0x7fff5cb9e598, 
line_nums=0x7fff5cb9e590) at hba.c:232



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