Date: Thu, 28 Aug 2008 13:13:57 +0100 From: "Steven Hartland" <killing@multiplay.co.uk> To: <freebsd-hackers@freebsd.org> Subject: lighttpd failing to accept new connections ( connection reset ) Message-ID: <A4FCC80B7CC742C393346F1FFE7AA18F@multiplay.co.uk>
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We're using lighttpd here for a new project and we're having issues
where by it simply stops processing after a 1-2 days.
Having looked at it in some detail this morning it seems that
the kernel is resetting the connection without notifying the
lighttpd process there is a new connection attempt. I assume
that the listen queue is full but why kevent is not notifying
lighttpd that there are outstanding events is beyond me.
The following is a truss of the process which is currently in
this state:-
kevent(6,0x0,0,{},11096,{1.000000000}) = 0 (0x0)
gettimeofday({1219920575.149428},0x0) = 0 (0x0)
kevent(6,0x0,0,{},11096,{1.000000000}) = 0 (0x0)
gettimeofday({1219920576.150443},0x0) = 0 (0x0)
ktrace of the operation as well:-
28363 lighttpd RET kevent 0
28363 lighttpd CALL gettimeofday(0x7fffffffeb20,0)
28363 lighttpd RET gettimeofday 0
28363 lighttpd CALL kevent(0x6,0,0,0x800e66000,0x2b58,0x7fffffffeb20)
28363 lighttpd GIO fd 6 wrote 0 bytes
""
28363 lighttpd GIO fd 6 read 0 bytes
""
28363 lighttpd RET kevent 0
28363 lighttpd CALL gettimeofday(0x7fffffffeb20,0)
28363 lighttpd RET gettimeofday 0
28363 lighttpd CALL kevent(0x6,0,0,0x800e66000,0x2b58,0x7fffffffeb20)
28363 lighttpd GIO fd 6 wrote 0 bytes
""
28363 lighttpd GIO fd 6 read 0 bytes
""
28363 lighttpd RET kevent 0
28363 lighttpd CALL gettimeofday(0x7fffffffeb20,0)
28363 lighttpd RET gettimeofday 0
28363 lighttpd CALL kevent(0x6,0,0,0x800e66000,0x2b58,0x7fffffffeb20)
28363 lighttpd GIO fd 6 wrote 0 bytes
""
28363 lighttpd GIO fd 6 read 0 bytes
""
28363 lighttpd RET kevent 0
28363 lighttpd CALL gettimeofday(0x7fffffffeb20,0)
28363 lighttpd RET gettimeofday 0
28363 lighttpd CALL kevent(0x6,0,0,0x800e66000,0x2b58,0x7fffffffeb20)
28363 lighttpd GIO fd 6 wrote 0 bytes
""
28363 lighttpd GIO fd 6 read 0 bytes
""
28363 lighttpd RET kevent 0
28363 lighttpd CALL gettimeofday(0x7fffffffeb20,0)
28363 lighttpd RET gettimeofday 0
28363 lighttpd CALL kevent(0x6,0,0,0x800e66000,0x2b58,0x7fffffffeb20)
28363 lighttpd GIO fd 6 wrote 0 bytes
""
28363 lighttpd GIO fd 6 read 0 bytes
""
28363 lighttpd RET kevent 0
28363 lighttpd CALL gettimeofday(0x7fffffffeb20,0)
28363 lighttpd RET gettimeofday 0
28363 lighttpd CALL kevent(0x6,0,0,0x800e66000,0x2b58,0x7fffffffeb20)
tcpdump shows:-
12:10:29.475255 IP (tos 0x10, ttl 64, id 9536, offset 0, flags [DF], proto: TCP (6), length: 64) client.61224 > server.80: S,
cksum 0x6d22 (incorrect (-> 0xedfa), 291994449:291994449(0) win 65535 <mss 1460,nop,wscale 1,nop,nop,timestamp 3661727139
0,sackOK,eol>
12:10:29.481396 IP (tos 0x0, ttl 61, id 25503, offset 0, flags [DF], proto: TCP (6), length: 60) server.80 > client.61224: S,
cksum 0xbf22 (correct), 3444532576:3444532576(0) ack 291994450 win 65535 <mss 1460,nop,wscale 9,sackOK,timestamp 3136311843
3661727139>
12:10:29.481419 IP (tos 0x10, ttl 64, id 9538, offset 0, flags [DF], proto: TCP (6), length: 52) client.61224 > server.80: .,
cksum 0x6d16 (incorrect (-> 0x6bd2), 1:1(0) ack 1 win 33304 <nop,nop,timestamp 3661727145 3136311843>
12:10:29.487519 IP (tos 0x10, ttl 61, id 25504, offset 0, flags [DF], proto: TCP (6), length: 40) server.80 > client.61224: R,
cksum 0x20c7 (correct), 3444532577:3444532577(0) win 0
This may have been raised before back 2003 as bug kern/57380
but it was closed after no response from the reporter.
Another possible issues related to this is:-
http://trac.lighttpd.net/trac/ticket/1734
I've currently got one of the production machines offline
with this error ( hence the important flag ) in the hope
that someone can suggest a test which will shed more light
on the issue before I restart it.
Regards
Steve
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