One more attempt: stuck processes

[Ken Murchison]

Sebastian Hagedorn wrote:
> --On 16. November 2007 09:37:42 -0600 Gary Mills <mills at cc.umanitoba.ca> 
> wrote:
> 
>>> Could you get a stack trace? If you have gdb you just call it with "gdb
>>> -p  19175". Then you can do "bt" at the prompt. I forget how to do it
>>> with  Sun's debugger.
>>
>> Easy:
>>
>>   # pstack 19175
>>   19175:  pop3d -s
>>    fef9f810 read     (0, 2316f0, 5)
>>    fee1d2d0 read     (0, 2316f0, 5, 0, 0, 0) + 5c
>>    ff06bb38 sock_read (1f0860, 2316f0, 5, 5, 0, 0) + 24
>>    ff068af0 BIO_read (1f0860, 2316f0, 5, fef98b84, 0, 0) + 110
>>    ff278488 ssl3_read_n (212798, 5, 8805, 0, 0, 203958) + 174
>>    ff2785fc ssl3_get_record (204ce0, 8000, 8400, 4400, f1, f0) + d0
>>    ff279424 ssl3_read_bytes (212798, 1000, 2000, 4, 0, ffbfe731) + 228
>>    ff27a99c ssl3_get_message (ff2a259c, 2070a0, 0, ffffffff, 19000,
>> ffbfe7a0) + d0 ff27042c ssl3_accept (2150, 2160, 2180, 21e0, 2110, 2122)
>> + 904    ff27bd2c ssl23_get_client_hello (2316fb, 6c, 6c, 4, fffffe79, 0)
>> + 828    ff27b4b4 ssl23_accept (4000, 2000, 0, 0, 0, 0) + 2a4
>>    00032d00 tls_start_servertls (0, 1, ffbfee24, ffbfee20, 1849a8, ff00)
>> + 198    0002c504 cmd_starttls (1, 1fd8b8, 0, 0, 0, 0) + 184
>>    0002a638 service_main (2, 192198, ffbffce0, 1aec4, 3508c, 1) + 488
>>    00035250 main     (2, ffbffcd4, ffbffce0, 17c400, 0, 0) + e18
>>    00029298 _start   (0, 0, 0, 0, 0, 0) + 108
> 
> Thanks, that looks like progress! That stack trace looks similar enough 
> to the one I'm seeing that I could imagine that it is what I *should* be 
> seeing if the stack weren't garbled. Of course that's only speculation.
> 
> Ken, is it possible that the call to SSL_accept() in 
> tls_start_servertls() blocks when the client goes away? That could 
> explain everything ....

Yes.  Gary's problem might be very similar to yours, depending on what I 
see from the patch that I just sent you.

-- 
Kenneth Murchison
Systems Programmer
Project Cyrus Developer/Maintainer
Carnegie Mellon University