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#1: Apache Hangs.. Server-Status shows all Reading

Posted on 2007-11-07 18:31:58 by altendew

Hi this keeps happening a lot where my server will be unresponsive... it just
hangs forever.. so I checked the apache server-status and there was 131
requests that looked like this..

39-16 2177 0/67/114 R 0.95 47 562 0.0 0.48 0.66 ? ? ..reading..
40-16 29189 0/220/220 R 3.40 47 135 0.0 0.67 0.67 ? ? ..reading..
41-16 3959 0/7/111 R 0.21 48 81 0.0 0.01 0.42 ? ? ..reading..

They were all just in the "reading" state and i couldnt get an open slot nor
anyone else who was viewing our websites..

I restarted apache and all was fine.. but then 20 minutes later they went
back all into a reading state.. it appears as if slowly each processes goes
into the reading state?? I dont understand what the problem is.
--
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#2: Re: Apache Hangs.. Server-Status shows all Reading

Posted on 2007-11-08 08:30:46 by Christian Folini

Hey Andrew,

You have to try and isolate the problem.
It's a start to remove modules and make the issue
go away in a lab setup and thus identify the component
that is causing the problem. Try to nail down the
individual requests that cause a server process/thread
to hang.

Ideally mod_forensic should tell you about this
requests as the forensic log will tell you about incoming
requests before they are handled. But I am not sure
they are in the forensic log as your status suggests
they are still being read.

tcpdump outside of your apache could help here (start
with "tcpdump -A -s 0 port xxx" here. Unless it is
https traffic, then it would not tell you much.

regs,

Christian

On Wed, Nov 07, 2007 at 09:31:58AM -0800, Andrew Rosolino wrote:
>
> Hi this keeps happening a lot where my server will be unresponsive... it just
> hangs forever.. so I checked the apache server-status and there was 131
> requests that looked like this..
>
> 39-16 2177 0/67/114 R 0.95 47 562 0.0 0.48 0.66 ? ? ..reading..
> 40-16 29189 0/220/220 R 3.40 47 135 0.0 0.67 0.67 ? ? ..reading..
> 41-16 3959 0/7/111 R 0.21 48 81 0.0 0.01 0.42 ? ? ..reading..
>
> They were all just in the "reading" state and i couldnt get an open slot nor
> anyone else who was viewing our websites..
>
> I restarted apache and all was fine.. but then 20 minutes later they went
> back all into a reading state.. it appears as if slowly each processes goes
> into the reading state?? I dont understand what the problem is.
> --
> View this message in context: http://www.nabble.com/Apache-Hangs..-Server-Status-shows-all -Reading-tf4766110.html#a13631744
> Sent from the Apache HTTP Server - Users mailing list archive at Nabble.com.
>
>
> ------------------------------------------------------------ ---------
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> See <URL:http://httpd.apache.org/userslist.html> for more info.
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>

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#3: Re: Apache Hangs.. Server-Status shows all Reading

Posted on 2007-11-08 16:14:25 by altendew

Ok next time it happens ill try tcpdump -A -s 0 port 80 and let you know..
thank u.

Christian Folini-4 wrote:
>
> Hey Andrew,
>
> You have to try and isolate the problem.
> It's a start to remove modules and make the issue
> go away in a lab setup and thus identify the component
> that is causing the problem. Try to nail down the
> individual requests that cause a server process/thread
> to hang.
>
> Ideally mod_forensic should tell you about this
> requests as the forensic log will tell you about incoming
> requests before they are handled. But I am not sure
> they are in the forensic log as your status suggests
> they are still being read.
>
> tcpdump outside of your apache could help here (start
> with "tcpdump -A -s 0 port xxx" here. Unless it is
> https traffic, then it would not tell you much.
>
> regs,
>
> Christian
>
> On Wed, Nov 07, 2007 at 09:31:58AM -0800, Andrew Rosolino wrote:
>>
>> Hi this keeps happening a lot where my server will be unresponsive... it
>> just
>> hangs forever.. so I checked the apache server-status and there was 131
>> requests that looked like this..
>>
>> 39-16 2177 0/67/114 R 0.95 47 562 0.0 0.48 0.66 ? ? ..reading..
>> 40-16 29189 0/220/220 R 3.40 47 135 0.0 0.67 0.67 ? ? ..reading..
>> 41-16 3959 0/7/111 R 0.21 48 81 0.0 0.01 0.42 ? ? ..reading..
>>
>> They were all just in the "reading" state and i couldnt get an open slot
>> nor
>> anyone else who was viewing our websites..
>>
>> I restarted apache and all was fine.. but then 20 minutes later they went
>> back all into a reading state.. it appears as if slowly each processes
>> goes
>> into the reading state?? I dont understand what the problem is.
>> --
>> View this message in context:
>> http://www.nabble.com/Apache-Hangs..-Server-Status-shows-all -Reading-tf4766110.html#a13631744
>> Sent from the Apache HTTP Server - Users mailing list archive at
>> Nabble.com.
>>
>>
>> ------------------------------------------------------------ ---------
>> The official User-To-User support forum of the Apache HTTP Server
>> Project.
>> See <URL:http://httpd.apache.org/userslist.html> for more info.
>> To unsubscribe, e-mail: users-unsubscribe@httpd.apache.org
>> " from the digest: users-digest-unsubscribe@httpd.apache.org
>> For additional commands, e-mail: users-help@httpd.apache.org
>>
>
> ------------------------------------------------------------ ---------
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>
>

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#4: Re: Apache Hangs.. Server-Status shows all Reading

Posted on 2007-11-08 19:27:59 by altendew

Ok I did it but how am I suppose to read this?

J5...3.P..w....8P...{.........
13:26:22.990526 IP alpha2.shiftcode.com.http > nat10.ekspres.net.pl.3891: .
ack 1 win 6432
E..(..@.@.G.J5..S..

.P.3...{..w.P.. \...
13:26:22.994371 IP nat10.ekspres.net.pl.3891 > alpha2.shiftcode.com.http: R
1:1(0) ack 1091 win 0
E..(0.@.r.~]S..

J5...3.P..w....zP...v.........
13:26:23.002050 IP n219077060129.netvigator.com.61317 >
alpha2.shiftcode.com.http: S 2990870443:2990870443(0) win 642
40 <mss 1452,nop,nop,sackOK>

E..0.<@.v....M<.J5.....P.E......p...n...........
13:26:23.002083 IP alpha2.shiftcode.com.http >
n219077060129.netvigator.com.61317: S 3164683349:3164683349(0) ack 299
0870444 win 5840 <mss 1460,nop,nop,sackOK>



Christian Folini-4 wrote:
>
> Hey Andrew,
>
> You have to try and isolate the problem.
> It's a start to remove modules and make the issue
> go away in a lab setup and thus identify the component
> that is causing the problem. Try to nail down the
> individual requests that cause a server process/thread
> to hang.
>
> Ideally mod_forensic should tell you about this
> requests as the forensic log will tell you about incoming
> requests before they are handled. But I am not sure
> they are in the forensic log as your status suggests
> they are still being read.
>
> tcpdump outside of your apache could help here (start
> with "tcpdump -A -s 0 port xxx" here. Unless it is
> https traffic, then it would not tell you much.
>
> regs,
>
> Christian
>
> On Wed, Nov 07, 2007 at 09:31:58AM -0800, Andrew Rosolino wrote:
>>
>> Hi this keeps happening a lot where my server will be unresponsive... it
>> just
>> hangs forever.. so I checked the apache server-status and there was 131
>> requests that looked like this..
>>
>> 39-16 2177 0/67/114 R 0.95 47 562 0.0 0.48 0.66 ? ? ..reading..
>> 40-16 29189 0/220/220 R 3.40 47 135 0.0 0.67 0.67 ? ? ..reading..
>> 41-16 3959 0/7/111 R 0.21 48 81 0.0 0.01 0.42 ? ? ..reading..
>>
>> They were all just in the "reading" state and i couldnt get an open slot
>> nor
>> anyone else who was viewing our websites..
>>
>> I restarted apache and all was fine.. but then 20 minutes later they went
>> back all into a reading state.. it appears as if slowly each processes
>> goes
>> into the reading state?? I dont understand what the problem is.
>> --
>> View this message in context:
>> http://www.nabble.com/Apache-Hangs..-Server-Status-shows-all -Reading-tf4766110.html#a13631744
>> Sent from the Apache HTTP Server - Users mailing list archive at
>> Nabble.com.
>>
>>
>> ------------------------------------------------------------ ---------
>> The official User-To-User support forum of the Apache HTTP Server
>> Project.
>> See <URL:http://httpd.apache.org/userslist.html> for more info.
>> To unsubscribe, e-mail: users-unsubscribe@httpd.apache.org
>> " from the digest: users-digest-unsubscribe@httpd.apache.org
>> For additional commands, e-mail: users-help@httpd.apache.org
>>
>
> ------------------------------------------------------------ ---------
> The official User-To-User support forum of the Apache HTTP Server Project.
> See <URL:http://httpd.apache.org/userslist.html> for more info.
> To unsubscribe, e-mail: users-unsubscribe@httpd.apache.org
> " from the digest: users-digest-unsubscribe@httpd.apache.org
> For additional commands, e-mail: users-help@httpd.apache.org
>
>
>

--
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------------------------------------------------------------ ---------
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Report this message

#5: Re: Apache Hangs.. Server-Status shows all Reading

Posted on 2007-11-09 07:48:28 by Christian Folini

On Thu, Nov 08, 2007 at 10:27:59AM -0800, Andrew Rosolino wrote:
>
> Ok I did it but how am I suppose to read this?

That's not the interesting part. There should be more data.

Below is an example of a simple GET request
in a local setup. You can clearly see the request.
You can also take this into wireshark/ethereal and
select "follow tcp stream" or so.

regs,

Christian

07:45:47.905305 IP wcwe003u.pnet.ch.58702 > w032y7.pnet.ch.www: S 318106195:318106195(0) win 5840 <mss 1460,sackOK,timestamp 839725985 0,nop,wscale 7>
E..<..@.@.I.
...d
.....N.P...S...................

2
3.........
07:45:47.905345 IP w032y7.pnet.ch.www > wcwe003u.pnet.ch.58702: S 4288032982:4288032982(0) ack 318106196 win 5792 <mss 1460,sackOK,timestamp 627094047 839725985,nop,wscale 7>
E..<..@.@.#.
....
...d.P.N..0....T...............

%`..2
3.....
07:45:47.905543 IP wcwe003u.pnet.ch.58702 > w032y7.pnet.ch.www: . ack 1 win 46 <nop,nop,timestamp 839725986 627094047>
E..4..@.@.I.
...d
.....N.P...T..0............

2
3.%`..
07:45:47.905880 IP wcwe003u.pnet.ch.58702 > w032y7.pnet.ch.www: P 1:180(179) ack 1 win 46 <nop,nop,timestamp 839725986 627094047>
E.....@.@.I.
...d
.....N.P...T..0.....P......
2
3.%`..GET /index.html HTTP/1.1
User-Agent: curl/7.13.2 (i386-pc-linux-gnu) libcurl/7.13.2 OpenSSL/0.9.7e zlib/1.2.2 libidn/0.5.13
Host: 10.226.0.220
Pragma: no-cache
Accept: */*



07:45:47.905888 IP w032y7.pnet.ch.www > wcwe003u.pnet.ch.58702: . ack 180 win 54 <nop,nop,timestamp 627094047 839725986>
E..4..@.@...
....
...d.P.N..0........6.K.....

%`..2
3.
07:45:47.906504 IP w032y7.pnet.ch.www > wcwe003u.pnet.ch.58702: P 1:245(244) ack 180 win 54 <nop,nop,timestamp 627094047 839725986>
E..(..@.@...
....
...d.P.N..0........6.......
%`..2
3.HTTP/1.1 200 OK
Date: Fri, 09 Nov 2007 06:45:47 GMT
Server: Apache
Last-Modified: Thu, 08 Nov 2007 11:29:36 GMT
ETag: "31101-d-2e4b0800"
Accept-Ranges: bytes
Content-Length: 13
Connection: close
Content-Type: text/plain

hello world!

07:45:47.906720 IP wcwe003u.pnet.ch.58702 > w032y7.pnet.ch.www: . ack 245 win 54 <nop,nop,timestamp 839725986 627094047>
E..4..@.@.I.
...d
.....N.P......1....6
W.....

2
3.%`..
07:45:47.906797 IP w032y7.pnet.ch.www > wcwe003u.pnet.ch.58702: F 245:245(0) ack 180 win 54 <nop,nop,timestamp 627094047 839725986>
E..4..@.@...
....
...d.P.N..1........6
V.....

%`..2
3.
07:45:47.908037 IP wcwe003u.pnet.ch.58702 > w032y7.pnet.ch.www: F 180:180(0) ack 246 win 54 <nop,nop,timestamp 839725986 627094047>
E..4..@.@.I.
...d
.....N.P......1....6
U.....

2
3.%`..
07:45:47.908046 IP w032y7.pnet.ch.www > wcwe003u.pnet.ch.58702: . ack 181 win 54 <nop,nop,timestamp 627094048 839725986>
E..4..@.@...
....
...d.P.N..1........6
T.....

%`. 2
3.




------------------------------------------------------------ ---------
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See <URL:http://httpd.apache.org/userslist.html> for more info.
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#6: Re: Apache Hangs.. Server-Status shows all Reading

Posted on 2007-11-09 08:44:46 by altendew

I saved the file with the full output do you want to see that.. i only took a
section from it.


Christian Folini-4 wrote:
>
> On Thu, Nov 08, 2007 at 10:27:59AM -0800, Andrew Rosolino wrote:
>>
>> Ok I did it but how am I suppose to read this?
>
> That's not the interesting part. There should be more data.
>
> Below is an example of a simple GET request
> in a local setup. You can clearly see the request.
> You can also take this into wireshark/ethereal and
> select "follow tcp stream" or so.
>
> regs,
>
> Christian
>
> 07:45:47.905305 IP wcwe003u.pnet.ch.58702 > w032y7.pnet.ch.www: S
> 318106195:318106195(0) win 5840 <mss 1460,sackOK,timestamp 839725985
> 0,nop,wscale 7>
> E..<..@.@.I.
> ..d
> ....N.P...S...................
>
> 2
> 3.........
> 07:45:47.905345 IP w032y7.pnet.ch.www > wcwe003u.pnet.ch.58702: S
> 4288032982:4288032982(0) ack 318106196 win 5792 <mss 1460,sackOK,timestamp
> 627094047 839725985,nop,wscale 7>
> E..<..@.@.#.
> ...
> ..d.P.N..0....T...............
>
> %`..2
> 3.....
> 07:45:47.905543 IP wcwe003u.pnet.ch.58702 > w032y7.pnet.ch.www: . ack 1
> win 46 <nop,nop,timestamp 839725986 627094047>
> E..4..@.@.I.
> ..d
> ....N.P...T..0............
>
> 2
> 3.%`..
> 07:45:47.905880 IP wcwe003u.pnet.ch.58702 > w032y7.pnet.ch.www: P
> 1:180(179) ack 1 win 46 <nop,nop,timestamp 839725986 627094047>
> E.....@.@.I.
> ..d
> ....N.P...T..0.....P......
> 2
> 3.%`..GET /index.html HTTP/1.1
> User-Agent: curl/7.13.2 (i386-pc-linux-gnu) libcurl/7.13.2 OpenSSL/0.9.7e
> zlib/1.2.2 libidn/0.5.13
> Host: 10.226.0.220
> Pragma: no-cache
> Accept: */*
>
>
>
> 07:45:47.905888 IP w032y7.pnet.ch.www > wcwe003u.pnet.ch.58702: . ack 180
> win 54 <nop,nop,timestamp 627094047 839725986>
> E..4..@.@...
> ...
> ..d.P.N..0........6.K.....
>
> %`..2
> 3.
> 07:45:47.906504 IP w032y7.pnet.ch.www > wcwe003u.pnet.ch.58702: P
> 1:245(244) ack 180 win 54 <nop,nop,timestamp 627094047 839725986>
> E..(..@.@...
> ...
> ..d.P.N..0........6.......
> %`..2
> 3.HTTP/1.1 200 OK
> Date: Fri, 09 Nov 2007 06:45:47 GMT
> Server: Apache
> Last-Modified: Thu, 08 Nov 2007 11:29:36 GMT
> ETag: "31101-d-2e4b0800"
> Accept-Ranges: bytes
> Content-Length: 13
> Connection: close
> Content-Type: text/plain
>
> hello world!
>
> 07:45:47.906720 IP wcwe003u.pnet.ch.58702 > w032y7.pnet.ch.www: . ack 245
> win 54 <nop,nop,timestamp 839725986 627094047>
> E..4..@.@.I.
> ..d
> ....N.P......1....6
> W.....
>
> 2
> 3.%`..
> 07:45:47.906797 IP w032y7.pnet.ch.www > wcwe003u.pnet.ch.58702: F
> 245:245(0) ack 180 win 54 <nop,nop,timestamp 627094047 839725986>
> E..4..@.@...
> ...
> ..d.P.N..1........6
> V.....
>
> %`..2
> 3.
> 07:45:47.908037 IP wcwe003u.pnet.ch.58702 > w032y7.pnet.ch.www: F
> 180:180(0) ack 246 win 54 <nop,nop,timestamp 839725986 627094047>
> E..4..@.@.I.
> ..d
> ....N.P......1....6
> U.....
>
> 2
> 3.%`..
> 07:45:47.908046 IP w032y7.pnet.ch.www > wcwe003u.pnet.ch.58702: . ack 181
> win 54 <nop,nop,timestamp 627094048 839725986>
> E..4..@.@...
> ...
> ..d.P.N..1........6
> T.....
>
> %`. 2
> 3.
>
>
>
>
> ------------------------------------------------------------ ---------
> The official User-To-User support forum of the Apache HTTP Server Project.
> See <URL:http://httpd.apache.org/userslist.html> for more info.
> To unsubscribe, e-mail: users-unsubscribe@httpd.apache.org
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>
>

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#7: Re: Apache Hangs.. Server-Status shows all Reading

Posted on 2007-11-10 04:36:51 by Sander Temme

On Nov 7, 2007, at 9:31 AM, Andrew Rosolino wrote:

> I restarted apache and all was fine.. but then 20 minutes later
> they went
> back all into a reading state.. it appears as if slowly each
> processes goes
> into the reading state?? I dont understand what the problem is.

If you have gdb on the box (and have some acumen using it), you can
attach to one of the processes and see if it is hanging in something
obvious.

If not, and your traffic is plaintext, I recommend the tcpdump
approach to see what is going on traffic-wise, and what triggers the
issue. I'd dump the traffic to disk (tcpdump -i ethX -s 0 -w /
wherever/traffic.dump port 80) and take it over to a box with
Ethereal/Wireshark for some cozy analysis.

If you're being DOS attacked by trickle requests, you could try
setting a very low timeout (default is 5 minutes which doesn't seem
to be working for you) and perhaps use mod_evasive or somesuch to
flag and firewall the bad clients.

S.

--
Sander Temme
sctemme@apache.org
PGP FP: 51B4 8727 466A 0BC3 69F4 B7B8 B2BE BC40 1529 24AF




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#8: Re: Apache Hangs.. Server-Status shows all Reading

Posted on 2007-11-10 14:20:53 by alf

Hi

This seems to be quite similar to what I have seen, and others have also
posted about the last couple of years.
I've done a lot of investigation, but have not found a real solution.
My problem is that the threads gets stuck in "W" / "Sending reply" state.

Are you using mod_php ? If so, it might be that one thread is doing
work, while the other threads are waiting to acquire a lock on the php
session file.
When PHP session files are used, the request are processed sequentially,
and not in parallel for a user.

I suggest you also use "strace" unix command to see what the different
threads are doing, that might be easier than using gdb.
When I use strace, I see that one thread is hanging on "poll" system
call, until the timeout (Timeout Apache directive - default 300 seconds)
occur. Then I see that the next thread hangs in "poll" and so on.
So if you set the "Timeout" lower, it might improve your situation.

You should also run "netstat", and see what the status of the sockets
are. If they are almost all in CLOSE_WAIT, I think you are seeing
something similar to me.

Here are some links to similar issues, I'm not sure if it will help you :
http://www.nabble.com/RE:-requests-time-out-under-load,-no-w arnings-in-logs-p13065495.html
http://mail-archives.apache.org/mod_mbox/httpd-users/200611. mbox/%3c20061114084333.GC10809@nexus.intra.coretrek.com%3e
( and the other posts to that thread)
http://www.linuxforums.org/forum/servers/27519-alright-im-dy ing-here-apache-help-mysql-php.html
http://osdir.com/ml/apache.mod-ssl.user/2004-10/msg00009.htm l

I have also seen other posts from people with very similar problems,
lots of thread stuck in a state.

What is your environment ? I.e. what version of Apache, what operating
system and version, are you generating dynamic pages, and if so, what
tools (for example php) are you using ?
Do you have a firewall or a load balancer in front of your web server ?

Are almost all the requests from the same IP adresse ? Are almost all
the request for the same URL ?

What my theory is at the moment, after throwing away some other
theories, are that somehow a client creates several hundred requests for
the same URL.
Since in my case this happens fairly often, several times a day on a
uncontroversial high traffic site, from different users, I do not think
it is someone doing a DoS attack.

I think it might be a problem with a firewall or a proxy or maybe the
browser (I have seen it happen for people using both Windows and Mac,
both Firefox and IE), that sits between the web server and the end user.
Somehow the closing of the socket/connection by the browser is not
picked up by the web server. And somehow the browser issues lots of
requests.
I have not completely ruled out that it might be a Apache web server bug
as well.
But since I have no way of reproducing this, apart from observing it
happening quite often, it is very hard to get any further.
So any help would be greatly appreciated.

Regards
Alf Hogemark



Sander Temme wrote:
>
> On Nov 7, 2007, at 9:31 AM, Andrew Rosolino wrote:
>
>> I restarted apache and all was fine.. but then 20 minutes later they
>> went
>> back all into a reading state.. it appears as if slowly each
>> processes goes
>> into the reading state?? I dont understand what the problem is.
>
> If you have gdb on the box (and have some acumen using it), you can
> attach to one of the processes and see if it is hanging in something
> obvious.
>
> If not, and your traffic is plaintext, I recommend the tcpdump
> approach to see what is going on traffic-wise, and what triggers the
> issue. I'd dump the traffic to disk (tcpdump -i ethX -s 0 -w
> /wherever/traffic.dump port 80) and take it over to a box with
> Ethereal/Wireshark for some cozy analysis.
>
> If you're being DOS attacked by trickle requests, you could try
> setting a very low timeout (default is 5 minutes which doesn't seem to
> be working for you) and perhaps use mod_evasive or somesuch to flag
> and firewall the bad clients.
>
> S.
>

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Report this message

#9: Re: Apache Hangs.. Server-Status shows all Reading

Posted on 2007-11-11 17:31:42 by altendew

Ok I used gdb to a process (that was stuck in reading state) and look at what
it told me..

#0 0x003307a2 in _dl_sysinfo_int80 () from /lib/ld-linux.so.2
#1 0x00408dbd in poll () from /lib/tls/libc.so.6
#2 0x00af595f in apr_poll (aprset=0xbfe55310, num=1, nsds=0xbfe5530c,
timeout=300000) at poll.c:130
#3 0x00af5d5f in apr_wait_for_io_or_timeout (f=0x0, s=0x959b4a8,
for_read=1)
at waitio.c:54
#4 0x00aec19c in apr_socket_recv (sock=0x959b4a8,
buf=0x9624688 "\n# AddHandler application/x-httpd-php .php
..sc\r\nIndexIgnore .htaccess */.??* *~ *# */HEADER* */README*
*/_vti*\r\nDirectoryIndex home.gc index.gc index.php\r\n\r\n<Limit GET
POST>\r\n#The next line modified b"...,
len=0xbfe553e8) at sendrecv.c:87
#5 0x00fcc0dc in socket_bucket_read (a=0x95c0468, str=0xbfe553e4,
len=0xbfe553e8, block=APR_BLOCK_READ) at apr_buckets_socket.c:36
#6 0x00fcd06a in apr_brigade_split_line (bbOut=0x95d0f50, bbIn=0x959b9a0,
block=APR_BLOCK_READ, maxbytes=8192) at apr_brigade.c:289
#7 0x080b9a9b in core_input_filter (f=0x959b968, b=0x95d0f50,
mode=AP_MODE_GETLINE, block=APR_BLOCK_READ, readbytes=0) at core.c:3802
#8 0x0806e8db in logio_in_filter (f=0x959b928, bb=0x95d0f50,
mode=AP_MODE_GETLINE, block=APR_BLOCK_READ, readbytes=0) at
mod_logio.c:115
#9 0x080b3ae3 in ap_rgetline_core (s=0x95d02a0, n=8192, read=0xbfe55528,
r=0x95d0288, fold=0, bb=0x95d0f50) at protocol.c:230
#10 0x080b4577 in ap_read_request (conn=0x959b580) at protocol.c:586
#11 0x0808bc6e in ap_process_http_connection (c=0x959b580) at
http_core.c:271
---Type <return> to continue, or q <return> to quit---
#12 0x080b0a62 in ap_run_process_connection (c=0x959b580) at connection.c:43
#13 0x080a5ad1 in child_main (child_num_arg=Variable "child_num_arg" is not
available.
) at prefork.c:610
#14 0x080a5cfb in make_child (s=Variable "s" is not available.
) at prefork.c:704
#15 0x080a5d8c in startup_children (number_to_start=5) at prefork.c:722
#16 0x080a645f in ap_mpm_run (_pconf=0x8c2c0a8, plog=0x8c6c1a8, s=0x8c32ed0)
at prefork.c:941
#17 0x080ab803 in main (argc=4, argv=0xbfe558c4) at main.c:638


Sander Temme-2 wrote:
>
>
> On Nov 7, 2007, at 9:31 AM, Andrew Rosolino wrote:
>
>> I restarted apache and all was fine.. but then 20 minutes later
>> they went
>> back all into a reading state.. it appears as if slowly each
>> processes goes
>> into the reading state?? I dont understand what the problem is.
>
> If you have gdb on the box (and have some acumen using it), you can
> attach to one of the processes and see if it is hanging in something
> obvious.
>
> If not, and your traffic is plaintext, I recommend the tcpdump
> approach to see what is going on traffic-wise, and what triggers the
> issue. I'd dump the traffic to disk (tcpdump -i ethX -s 0 -w /
> wherever/traffic.dump port 80) and take it over to a box with
> Ethereal/Wireshark for some cozy analysis.
>
> If you're being DOS attacked by trickle requests, you could try
> setting a very low timeout (default is 5 minutes which doesn't seem
> to be working for you) and perhaps use mod_evasive or somesuch to
> flag and firewall the bad clients.
>
> S.
>
> --
> Sander Temme
> sctemme@apache.org
> PGP FP: 51B4 8727 466A 0BC3 69F4 B7B8 B2BE BC40 1529 24AF
>
>
>
>
> ------------------------------------------------------------ ---------
> The official User-To-User support forum of the Apache HTTP Server Project.
> See <URL:http://httpd.apache.org/userslist.html> for more info.
> To unsubscribe, e-mail: users-unsubscribe@httpd.apache.org
> " from the digest: users-digest-unsubscribe@httpd.apache.org
> For additional commands, e-mail: users-help@httpd.apache.org
>
>
>

--
View this message in context: http://www.nabble.com/Apache-Hangs..-Server-Status-shows-all -Reading-tf4766110.html#a13693055
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Report this message

#10: Re: Apache Hangs.. Server-Status shows all Reading

Posted on 2007-11-11 17:49:07 by altendew

Im using this for php..
LoadModule php4_module modules/libphp4.so

not sure if that is mod_php or what

I tried using strace but my server was going extremly slow when I started i=
t
probably because we get so much traffic so i couldnt debug it...

I did run the gdb on a process and got this..=20
#0 0x003307a2 in _dl_sysinfo_int80 () from /lib/ld-linux.so.2=20
#1 0x00408dbd in poll () from /lib/tls/libc.so.6=20
#2 0x00af595f in apr_poll (aprset=3D0xbfe55310, num=3D1, nsds=3D0xbfe5530c=
,=20
timeout=3D300000) at poll.c:130=20
#3 0x00af5d5f in apr_wait_for_io_or_timeout (f=3D0x0, s=3D0x959b4a8,
for_read=3D1)=20
at waitio.c:54=20
#4 0x00aec19c in apr_socket_recv (sock=3D0x959b4a8,=20
buf=3D0x9624688 "\n# AddHandler application/x-httpd-php .php
..sc\r\nIndexIgnore .htaccess */.??* *~ *# */HEADER* */README*
*/_vti*\r\nDirectoryIndex home.gc index.gc index.php\r\n\r\n<Limit GET
POST>\r\n#The next line modified b"...,=20
len=3D0xbfe553e8) at sendrecv.c:87=20
#5 0x00fcc0dc in socket_bucket_read (a=3D0x95c0468, str=3D0xbfe553e4,=20
len=3D0xbfe553e8, block=3DAPR_BLOCK_READ) at apr_buckets_socket.c:36=20
#6 0x00fcd06a in apr_brigade_split_line (bbOut=3D0x95d0f50, bbIn=3D0x959b9=
a0,=20
block=3DAPR_BLOCK_READ, maxbytes=3D8192) at apr_brigade.c:289=20
#7 0x080b9a9b in core_input_filter (f=3D0x959b968, b=3D0x95d0f50,=20
mode=3DAP_MODE_GETLINE, block=3DAPR_BLOCK_READ, readbytes=3D0) at core.=
c:3802=20
#8 0x0806e8db in logio_in_filter (f=3D0x959b928, bb=3D0x95d0f50,=20
mode=3DAP_MODE_GETLINE, block=3DAPR_BLOCK_READ, readbytes=3D0) at
mod_logio.c:115=20
#9 0x080b3ae3 in ap_rgetline_core (s=3D0x95d02a0, n=3D8192, read=3D0xbfe55=
528,=20
r=3D0x95d0288, fold=3D0, bb=3D0x95d0f50) at protocol.c:230=20
#10 0x080b4577 in ap_read_request (conn=3D0x959b580) at protocol.c:586=20
#11 0x0808bc6e in ap_process_http_connection (c=3D0x959b580) at
http_core.c:271=20
---Type <return> to continue, or q <return> to quit---=20
#12 0x080b0a62 in ap_run_process_connection (c=3D0x959b580) at connection.c=
:43=20
#13 0x080a5ad1 in child_main (child_num_arg=3DVariable "child_num_arg" is n=
ot
available.=20
) at prefork.c:610=20
#14 0x080a5cfb in make_child (s=3DVariable "s" is not available.=20
) at prefork.c:704=20
#15 0x080a5d8c in startup_children (number_to_start=3D5) at prefork.c:722=
=20
#16 0x080a645f in ap_mpm_run (_pconf=3D0x8c2c0a8, plog=3D0x8c6c1a8, s=3D0x8=
c32ed0)=20
at prefork.c:941=20
#17 0x080ab803 in main (argc=3D4, argv=3D0xbfe558c4) at main.c:638=20

havent tried netstat yet because the problem isnt occuring right now..
Here is some info on the Apache we are using:
Server Version: Apache/2.0.61 (Unix) mod_ssl/2.0.61 OpenSSL/0.9.7a
mod_auth_passthrough/2.1 FrontPage/5.0.2.2635 mod_bwlimited/1.4=20

We are running REDHAT Enterprise 4 i686 almost all our pages are dynamic
php.. and its running about 200 websites.. we dont have a load balancer..=
=20

All the requests are not from the same ip address very random.


Alf Høgemark wrote:
>=20
> Hi
>=20
> This seems to be quite similar to what I have seen, and others have also=
=20
> posted about the last couple of years.
> I've done a lot of investigation, but have not found a real solution.
> My problem is that the threads gets stuck in "W" / "Sending reply" state.
>=20
> Are you using mod_php ? If so, it might be that one thread is doing=20
> work, while the other threads are waiting to acquire a lock on the php=20
> session file.
> When PHP session files are used, the request are processed sequentially,=
=20
> and not in parallel for a user.
>=20
> I suggest you also use "strace" unix command to see what the different=20
> threads are doing, that might be easier than using gdb.
> When I use strace, I see that one thread is hanging on "poll" system=20
> call, until the timeout (Timeout Apache directive - default 300 seconds)=
=20
> occur. Then I see that the next thread hangs in "poll" and so on.
> So if you set the "Timeout" lower, it might improve your situation.
>=20
> You should also run "netstat", and see what the status of the sockets=20
> are. If they are almost all in CLOSE_WAIT, I think you are seeing=20
> something similar to me.
>=20
> Here are some links to similar issues, I'm not sure if it will help you :
> http://www.nabble.com/RE:-requests-time-out-under-load,-no-w arnings-in-lo=
gs-p13065495.html
> http://mail-archives.apache.org/mod_mbox/httpd-users/200611. mbox/%3c20061=
114084333.GC10809@nexus.intra.coretrek.com%3e=20
> ( and the other posts to that thread)
> http://www.linuxforums.org/forum/servers/27519-alright-im-dy ing-here-apac=
he-help-mysql-php.html
> http://osdir.com/ml/apache.mod-ssl.user/2004-10/msg00009.htm l
>=20
> I have also seen other posts from people with very similar problems,=20
> lots of thread stuck in a state.
>=20
> What is your environment ? I.e. what version of Apache, what operating=20
> system and version, are you generating dynamic pages, and if so, what=20
> tools (for example php) are you using ?
> Do you have a firewall or a load balancer in front of your web server ?
>=20
> Are almost all the requests from the same IP adresse ? Are almost all=20
> the request for the same URL ?
>=20
> What my theory is at the moment, after throwing away some other=20
> theories, are that somehow a client creates several hundred requests for=
=20
> the same URL.
> Since in my case this happens fairly often, several times a day on a=20
> uncontroversial high traffic site, from different users, I do not think=
=20
> it is someone doing a DoS attack.
>=20
> I think it might be a problem with a firewall or a proxy or maybe the=20
> browser (I have seen it happen for people using both Windows and Mac,=20
> both Firefox and IE), that sits between the web server and the end user.=
=20
> Somehow the closing of the socket/connection by the browser is not=20
> picked up by the web server. And somehow the browser issues lots of=20
> requests.
> I have not completely ruled out that it might be a Apache web server bug=
=20
> as well.
> But since I have no way of reproducing this, apart from observing it=20
> happening quite often, it is very hard to get any further.
> So any help would be greatly appreciated.
>=20
> Regards
> Alf Hogemark
>=20
>=20
>=20
> Sander Temme wrote:
>>
>> On Nov 7, 2007, at 9:31 AM, Andrew Rosolino wrote:
>>
>>> I restarted apache and all was fine.. but then 20 minutes later they=20
>>> went
>>> back all into a reading state.. it appears as if slowly each=20
>>> processes goes
>>> into the reading state?? I dont understand what the problem is.
>>
>> If you have gdb on the box (and have some acumen using it), you can=20
>> attach to one of the processes and see if it is hanging in something=20
>> obvious.
>>
>> If not, and your traffic is plaintext, I recommend the tcpdump=20
>> approach to see what is going on traffic-wise, and what triggers the=20
>> issue. I'd dump the traffic to disk (tcpdump -i ethX -s 0 -w=20
>> /wherever/traffic.dump port 80) and take it over to a box with=20
>> Ethereal/Wireshark for some cozy analysis.
>>
>> If you're being DOS attacked by trickle requests, you could try=20
>> setting a very low timeout (default is 5 minutes which doesn't seem to=
=20
>> be working for you) and perhaps use mod_evasive or somesuch to flag=20
>> and firewall the bad clients.
>>
>> S.
>>
>=20
> ------------------------------------------------------------ ---------
> The official User-To-User support forum of the Apache HTTP Server Project=
..
> See <URL:http://httpd.apache.org/userslist.html> for more info.
> To unsubscribe, e-mail: users-unsubscribe@httpd.apache.org
> " from the digest: users-digest-unsubscribe@httpd.apache.org
> For additional commands, e-mail: users-help@httpd.apache.org
>=20
>=20
>=20

--=20
View this message in context: http://www.nabble.com/Apache-Hangs..-Server-S=
tatus-shows-all-Reading-tf4766110.html#a13693182
Sent from the Apache HTTP Server - Users mailing list archive at Nabble.com=
..


------------------------------------------------------------ ---------
The official User-To-User support forum of the Apache HTTP Server Project.
See <URL:http://httpd.apache.org/userslist.html> for more info.
To unsubscribe, e-mail: users-unsubscribe@httpd.apache.org
" from the digest: users-digest-unsubscribe@httpd.apache.org
For additional commands, e-mail: users-help@httpd.apache.org

Report this message

#11: Re: Apache Hangs.. Server-Status shows all Reading

Posted on 2007-11-26 16:49:25 by JEROME

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#12: Re: Apache Hangs.. Server-Status shows all Reading

Posted on 2008-01-28 21:35:50 by christian.koeberl

Hi!


Jérôme Etévé-2 wrote:
>=20
> I've got here exactly the same problem, but without any php modules. My
> server serves only static resources and It's flooded with reading state
> request sometime.
>=20

We've also got the same problem and as it seems the Apache foundation has
the same problem as well (see this server-status of issues.apache.org:=20
http://www.nabble.com/file/p15144733/server-status-issues-ap ache-2008-01-25=
..htm
server-status-issues-apache-2008-01-25.htm ). The actual problem is that
requests are stuck in "Reading Request" until the timeout occurs. In the
server-status from issues.apache.org you see "R"-request with more than 500=
s
running.

There are several people describing the same problem with different version=
s
of Apache (also 1.x) and different SSL implementation - but no solution.

I have made a JMeter test, wich only requests static resources on our serve=
r
to find the cause: I can reproduce the problem on our test server. There,
I've done some analysis with netstat and I've seen that there are lot of tc=
p
connections with "TIME_WAIT" - but I'm not sure if that is in connection
with this phenomenon.

Anybody else got this problem? Did anybody solve this?

Maybe we should file a bugzilla entry?

--=20
Chris
--=20
View this message in context: http://www.nabble.com/Apache-Hangs..-Server-S=
tatus-shows-all-Reading-tp13631744p15144733.html
Sent from the Apache HTTP Server - Users mailing list archive at Nabble.com=
..


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