Messages in this thread |  | | Date | Sun, 26 Jan 1997 01:40:24 -0500 | From | Vance Huntley <> | Subject | 2.1.21 BUG in net/ipv4/tcp_ipv4.c |
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I am currently doing some web server development, and I'm having some trouble. The server flies along just fine for somewhere between 5 minutes and an hour, and then it comes to a full stop. I've been working under the assumption that my own crappy programing was getting me into a deadlock situation, but just now I discovered something interesting in /var/log/debug.
I started stress-testing my server at 00:47, and it happily pumped out ~320kB/s until 01:03. I killed the server processes at 01:20, where the debug log stopped. Jan 26 00:49:31 genji kernel: droping syn ack:20 max:20 Jan 26 00:50:02 genji last message repeated 4 times Jan 26 00:51:05 genji last message repeated 20 times Jan 26 00:51:10 genji last message repeated 2 times Jan 26 00:51:13 genji kernel: BUG: syn_recv:socket exists Jan 26 00:51:28 genji kernel: droping syn ack:20 max:20 Jan 26 00:55:59 genji last message repeated 222 times Jan 26 00:57:00 genji last message repeated 238 times Jan 26 00:58:00 genji last message repeated 255 times Jan 26 00:58:58 genji last message repeated 252 times
etc.....
26 01:19:00 genji last message repeated 349 times Jan 26 01:20:00 genji last message repeated 349 times Jan 26 01:20:57 genji last message repeated 288 times
The kernel: BUG: syn_recv: socket exists line is from net/ipv4/tcp_ipv4.c. I cannot find where the "dropping syn ack" message is coming from, or indeed if it is even something to be concerned about. The behaviour is repeatable, although the "BUG: syn_recv" message does not always appear.
Any thoughts on all of this? Here is a little more info:
kernel 2.1.21 patch2. GCC 2.7.2.1 libg++ 2.7.2.1 <--- Compiled with -D-REENTRANT libc 5.4.17 linuxthreads 0.5 3Com 3c509 ethernet Dell OptiPlex GXMT 5100 (P100)
BTW - None of this happened while running under my previous kernel, 2.0.0
------------ Vance Huntley
Director of Technology (& Chat Guy) WebGenesis, Inc., Ithaca, NY 14850
vance@webgenesis.com --- 607.255.8499
Check out "The Globe"! --- http://www.theglobe.com/ ------------
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