RE: [tpop3d-discuss] tpop3d hanging at prompt

[Larry Chancy]

#gdb /usr/local/sbin/tpop3d 28200
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This GDB was configured as "i386-redhat-linux-gnu"...
Attaching to program: /usr/local/sbin/tpop3d, process 28200
Reading symbols from /lib/libcrypt.so.1...done.
Loaded symbols for /lib/libcrypt.so.1
Reading symbols from /lib/tls/libc.so.6...done.
Loaded symbols for /lib/tls/libc.so.6
Reading symbols from /lib/ld-linux.so.2...done.
Loaded symbols for /lib/ld-linux.so.2
Reading symbols from /lib/libnss_files.so.2...done.
Loaded symbols for /lib/libnss_files.so.2
0xffffe002 in ?? ()
(gdb) bt
#0  0xffffe002 in ?? ()
#1  0x420da75f in syslog () from /lib/tls/libc.so.6
#2  0x0804c6de in log_print (priority=9,
    fmt=0x8054380 "listeners_post_select: client %s: connected to local address
%s:%d") at logging.c:118
#3  0x0804e9d2 in listeners_post_select (readfds=0xbfffe1c0,
    writefds=0xbfffe140, exceptfds=0x0) at netloop.c:153
#4  0x0804f3cc in net_loop () at netloop.c:516
#5  0x0804de0c in main (argc=180, argv=0xbfffe344, envp=0xbfffe354)
    at main.c:546
#6  0x420156a4 in __libc_start_main () from /lib/tls/libc.so.6
(gdb) cont
Continuing.

Program received signal SIGINT, Interrupt.
0xffffe002 in ?? ()
(gdb) bt
#0  0xffffe002 in ?? ()
#1  0x420da75f in syslog () from /lib/tls/libc.so.6
#2  0x0804c6de in log_print (priority=9,
    fmt=0x8054600 "fork_child: %s: began session for `%s' with %s; child PID is
%d") at logging.c:118
#3  0x0804ee87 in fork_child (c=0x8060188) at netloop.c:310
#4  0x0804f172 in connections_post_select (readfds=0xbfffe1c0,
    writefds=0xbfffe140, exceptfds=0x0) at netloop.c:390
#5  0x0804f2c1 in net_loop () at netloop.c:499
#6  0x0804de0c in main (argc=180, argv=0xbfffe344, envp=0xbfffe354)
    at main.c:546
#7  0x420156a4 in __libc_start_main () from /lib/tls/libc.so.6
(gdb) cont
Continuing.

Program received signal SIGINT, Interrupt.
0xffffe002 in ?? ()
(gdb) bt
#0  0xffffe002 in ?? ()
#1  0x420da75f in syslog () from /lib/tls/libc.so.6
#2  0x0804c6de in log_print (priority=9,
    fmt=0x80523c0 "authcontext_new_user_pass: began session for `%s' with %s; ui
d %d, gid %d") at logging.c:118
#3  0x0804a0d5 in authcontext_new_user_pass (user=0x80604b0 "mnull",
    local_part=0x0, domain=0x805c018 "onr.com", pass=0x8060c20 "dallas1",
    clienthost=0x805fc50 "66.196.226.25", serverhost=0x8060918 "207.200.6.83")
    at authswitch.c:305
#4  0x080508ab in connection_do (c=0x805fbc8, p=0x805fd38) at pop3.c:448
#5  0x0804f0fb in connections_post_select (readfds=0xbfffe1c0,
    writefds=0xbfffe140, exceptfds=0x0) at netloop.c:377
#6  0x0804f2c1 in net_loop () at netloop.c:499
#7  0x0804de0c in main (argc=180, argv=0xbfffe344, envp=0xbfffe354)
    at main.c:546
#8  0x420156a4 in __libc_start_main () from /lib/tls/libc.so.6
(gdb) cont
Continuing.

Program received signal SIGINT, Interrupt.
0xffffe002 in ?? ()
(gdb) bt
#0  0xffffe002 in ?? ()
#1  0x420da75f in syslog () from /lib/tls/libc.so.6
#2  0x0804c6de in log_print (priority=9,
    fmt=0x8054600 "fork_child: %s: began session for `%s' with %s; child PID is
%d") at logging.c:118
#3  0x0804ee87 in fork_child (c=0x805c0d8) at netloop.c:310
#4  0x0804f172 in connections_post_select (readfds=0xbfffe1c0,
    writefds=0xbfffe140, exceptfds=0x0) at netloop.c:390
#5  0x0804f2c1 in net_loop () at netloop.c:499
#6  0x0804de0c in main (argc=180, argv=0xbfffe344, envp=0xbfffe354)
    at main.c:546
#7  0x420156a4 in __libc_start_main () from /lib/tls/libc.so.6
(gdb) detach
Detaching from program: /usr/local/sbin/tpop3d, process 28200
(gdb) quit

Thanks,
Larry 


-----Original Message-----
From: Chris Lightfoot [mailto:address@hidden
Sent: Tuesday, November 11, 2003 1:03 PM
To: Larry Chancy
Cc: address@hidden
Subject: Re: [tpop3d-discuss] tpop3d hanging at prompt


On Tue, Nov 11, 2003 at 01:06:30PM -0600, Larry Chancy wrote:
> Right now I see 104 people with an established connection to port 110 but 
> only 3 child processes. It looks like most of these are probably waiting for 
> the initial +OK banner.


Can you try attaching to tpop3d with a debugger and
sending a stack trace:

$ gdb /path/to/tpop3d pid-of-tpop3d-parent-process
    [...]
(gdb) bt
    [ prints stack trace ]
(gdb) cont
    [ tpop3d continues to run ]
    [ wait a few seconds, then hit ^C ]
    [ do the bt thing again ]
            [ repeat a few times, see if the stack trace
            changes in any interesting way ]
(gdb) detach
(gdb) quit

-- I'd be interested to see the results.

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