One more attempt: stuck processes
Hagedorn at uni-koeln.de
Thu Nov 15 12:27:37 EST 2007
--On 15. November 2007 11:00:39 -0500 Ken Murchison <murch at andrew.cmu.edu>
>> (gdb) bt
>> # 0 0x0079f41e in __read_nocancel () from /lib/tls/libc.so.6
>> # 1 0x00d0b2f7 in BIO_new_socket () from /lib/libcrypto.so.4
>> # 2 0x00d092b2 in BIO_read () from /lib/libcrypto.so.4
>> # 3 0x005dae13 in ssl23_read_bytes () from /lib/libssl.so.4
>> # 4 0x005d9c51 in ssl23_get_client_hello () from /lib/libssl.so.4
>> # 5 0x005d9712 in ssl23_accept () from /lib/libssl.so.4
>> # 6 0x005ddc9a in SSL_accept () from /lib/libssl.so.4
>> # 7 0x08052cb3 in shut_down ()
>> # 8 0x0804e513 in shut_down ()
>> # 9 0x0804d58c in ?? ()
>> # 10 0x00000001 in ?? ()
>> # 11 0x082ee848 in ?? ()
>> # 12 0x00000000 in ?? ()
>> Any other ideas?
> Not at the moment. I don't understand how SSL_accept() gets called from
That's what I'd been wondering about myself.
> Are you running a Murder?
No, it's a pretty plain setup.
The only reason I could imagine for the sequence of calls was signal
handling. But let's be methodical. There's only one spot where SSL_accept()
is called: in tls_start_servertls(). In pop3d.c that's only called in
cmd_starttls(). That in turn is called either in cmdloop (for handling of
STLS) or in service_main() for connections to port 995.
shut_down() could conceivably be called by signals_poll(). The POP process
above has the following lines in syslog at debug level:
Nov 15 15:44:18 lvr13 master: about to exec
Nov 15 15:44:18 lvr13 pop3s: executed
Nov 15 15:44:20 lvr13 pop3s: accepted connection
That's it. So I'm guessing that the connection (which was to some dial-up
IP address) got dropped while the process was in service_main(). I don't
understand why that doesn't show up in the trace, and why last/first four
entries read '??'.
But even that doesn't really make sense, because shut_down() isn't actually
a signal handler, it's only called at certain points by signal_polls().
.:.Sebastian Hagedorn - RZKR-R1 (Gebäude 52), Zimmer 18.:.
Zentrum für angewandte Informatik - Universitätsweiter Service RRZK
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