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From Vasileios Kontorinis <bkontori...@gmail.com>
Subject Re: ALERT - canary mismatch on efree() - heap overflow detected
Date Tue, 29 Jun 2010 09:47:02 GMT
Shanti,
   After going over the commons-httpclient code I believe that the client is
behaving as expected and the server for some reason stops sending data,
while the clients expects them.
I am planning to upgrade my apache version to 2.2.15, so that I get all the
latest updates and bug fixes. (and so that I can go over the related code as
well)

So again sanity check, since I got no reply on this one...
I am currently using:
*php* v.5.2.4 (without Suhosin patch, I removed it)
*Server* version: Apache/2.2.11 (Ubuntu)
*memcached* 1.2.2*   (*from phpinfo() I read *memcache *2.2.5)
*mysql*  Ver 14.12 Distrib 5.0.75, for debian-linux-gnu (x86_64)
*apc* 3.0.19

Shanti/Akara, can you tell me the versions you are using for testing? Just
to be sure I am on the same page.

-Thanks
-------------------------------------------------------------------
Kontorinis Vasileios
Phd student, University of California San Diego
http://cseweb.ucsd.edu/~vkontori/
bkontorinis@gmail.com
-------------------------------------------------------------------


2010/5/24 Vasileios Kontorinis <bkontorinis@gmail.com>

> Well,
>    It feels like there are more than one things wrong in my configuration.
> I stopped using the thumper and went back to using the local fs of the
> web-server.
>
> Some of my issues went away but not all of them.
> Now it fails less often, every 5-10 runs.
>
> The error message in the faban logs:
>
> *UIDriverAgent[0].752.do <op> : chunked stream ended unexpectedly
> Note: Error not counted in result.
> Either transaction start or end time is not within steady state.
> *
> (if the error happens in the steady state it is counted...)
>
> I looked a little bit about it online, it seems like the server is getting
> a response that is not expecting. I have no clue how to debug that.
> Any ideas?
>
> Just a sanity check. I am using:
> *php* v.5.2.4 (without Suhosin patch, I removed it)
> *Server* version: Apache/2.2.11 (Ubuntu)
> *memcached* 1.2.2*   (*from phpinfo() I read *memcache *2.2.5)
> *mysql*  Ver 14.12 Distrib 5.0.75, for debian-linux-gnu (x86_64)
> *apc* 3.0.19
>
> Is this old?? I am considering upgrading my Ubuntu version from Hardy to
> Lucid with all the related package updates.
> As far php is concerned I know the current version is 5.2.12 so mine is
> pretty old.
>
> Let me know
> Thanks again.
>
> -------------------------------------------------------------------
> Kontorinis Vasileios
> Phd student, University of California San Diego
> http://cseweb.ucsd.edu/~vkontori/ <http://cseweb.ucsd.edu/%7Evkontori/>
> bkontorinis@gmail.com
> -------------------------------------------------------------------
>
>
> 2010/5/24 Vasileios Kontorinis <bkontorinis@gmail.com>
>
> I am using v3.
>>
>> What I observed and made me suspicious of nfs is in syslog a bunch of
>> messages:
>> May 22 00:22:37 olio-web -- MARK --
>> May 22 00:30:29 olio-web kernel: [2167206.713881] nfs: server 67.58.51.149
>> not responding, still trying
>> May 22 00:31:03 olio-web kernel: [2167240.993893] nfs: server 67.58.51.149
>> not responding, still trying
>> May 22 00:31:06 olio-web kernel: [2167243.193896] nfs: server 67.58.51.149
>> not responding, still trying
>> May 22 00:31:07 olio-web kernel: [2167244.349889] nfs: server 67.58.51.149
>> not responding, still trying
>> May 22 00:31:07 olio-web kernel: [2167244.357893] nfs: server 67.58.51.149
>> not responding, still trying
>> May 22 00:31:07 olio-web kernel: [2167244.669885] nfs: server 67.58.51.149
>> not responding, still trying
>> May 22 00:31:10 olio-web kernel: [2167247.781891] nfs: server 67.58.51.149
>> not responding, still trying
>> May 22 00:31:10 olio-web kernel: [2167247.785889] nfs: server 67.58.51.149
>> not responding, still trying
>> May 22 00:31:11 olio-web kernel: [2167248.725885] nfs: server 67.58.51.149
>> not responding, still trying
>> May 22 00:31:13 olio-web kernel: [2167250.153892] nfs: server 67.58.51.149
>> not responding, still trying
>> May 22 00:31:14 olio-web kernel: [2167251.173886] nfs: server 67.58.51.149
>> not responding, still trying
>> May 22 00:31:14 olio-web kernel: [2167251.410700] nfs: server 67.58.51.149
>> OK
>> May 22 00:31:14 olio-web kernel: [2167251.411158] nfs: server 67.58.51.149
>> OK
>> May 22 00:31:14 olio-web kernel: [2167251.411236] nfs: server 67.58.51.149
>> OK
>> May 22 00:31:14 olio-web kernel: [2167251.411249] nfs: server 67.58.51.149
>> OK
>> May 22 00:31:14 olio-web kernel: [2167251.411354] nfs: server 67.58.51.149
>> OK
>> May 22 00:31:14 olio-web kernel: [2167251.411678] nfs: server 67.58.51.149
>> OK
>> May 22 00:31:14 olio-web kernel: [2167251.411691] nfs: server 67.58.51.149
>> OK
>> May 22 00:31:14 olio-web kernel: [2167251.411712] nfs: server 67.58.51.149
>> OK
>> May 22 00:31:14 olio-web kernel: [2167251.411723] nfs: server 67.58.51.149
>> OK
>> May 22 00:31:14 olio-web kernel: [2167251.412047] nfs: server 67.58.51.149
>> OK
>> May 22 00:31:14 olio-web kernel: [2167251.414051] nfs: server 67.58.51.149
>> OK
>> May 22 00:42:37 olio-web -- MARK --
>> May 22 01:02:37 olio-web -- MARK --
>>
>> Regarding the olio run log it's weird.
>> Usually says nothing.  Sometimes it gives a bunch of
>>
>> UIDriverAgent[0].752.do <op> : chunked stream ended unexpectedly
>> Note: Error not counted in result.
>> Either transaction start or end time is not within steady state.
>>
>> and also
>>
>> UIDriverAgent[0].635.do <op> : connect timed out
>> Note: Error not counted in result.
>> Either transaction start or end time is not within steady state.
>>
>> where <op> different operations....
>>
>> But it does not log this every time...
>>
>> Is there a way to monitor nfs internals (buffering, throughput etc) on the
>> fly?
>> I am using sar but it does not give much helpful info?
>>
>>
>> -------------------------------------------------------------------
>> Kontorinis Vasileios
>> Phd student, University of California San Diego
>> http://cseweb.ucsd.edu/~vkontori/ <http://cseweb.ucsd.edu/%7Evkontori/>
>> bkontorinis@gmail.com
>> -------------------------------------------------------------------
>>
>>
>> 2010/5/24 Shanti Subramanyam <shanti.subramanyam@gmail.com>
>>
>> Which version of NFS are you using ? I suggest you try v3 - it is more
>>> efficient. We've run into issues with v4 causing unacceptable response
>>> times.
>>> For the kind of drop you are seeing, I am surprised that you don't find
>>> any errors anywhere.  In the first 400 user run for example, it looks like
>>> all the processes either exited or are stalled. In either case, I would
>>> expect to see errors in the faban run log (either that the driver got an
>>> error or that it timed out). Are you sure you checked the faban log ?
>>>
>>> Have you tried running nfsstat to see if you can spot anything ?
>>>
>>> Shanti
>>>
>>>
>>> On Sun, May 23, 2010 at 7:07 PM, Vasileios Kontorinis <
>>> bkontorinis@gmail.com> wrote:
>>>
>>>> Shanti hi again,
>>>>     I sort of managed to fix that. I tried upgrading my php version to
>>>> 5.2.6 and the alert went away. My problems though are not fixed.
>>>> I even tried completely removing suhosin patch (it was a huge pain in
>>>> ubuntu, since you need to recompile the php module by yourself)
>>>> Still though my proms are there.
>>>>
>>>> Now, I get no warning the logs are clean but I get weird behavior. I
>>>> needed to send you guys some pics so I created a related page at:
>>>> http://cseweb.ucsd.edu/~vkontori/olio/olio.html<http://cseweb.ucsd.edu/%7Evkontori/olio/olio.html>
>>>> I have comments describing the prom at the end.
>>>>
>>>> <http://cseweb.ucsd.edu/%7Evkontori/olio/olio.html>Any help would be
>>>> most appreciated. I ve spent so much time on it without figuring it out.
>>>> My configuration is 1 web server on a vm with 6GB of mem. 4 cpus
>>>>                                1 db server on a vm with  5GB of mem. 4
>>>> cpus
>>>>                                1 fs server on a vm with  4GB of mem. 4
>>>> cpus. (this one just exposes over NFS the filestore)
>>>> All on the same physical machine a nehalem based server, siting on a
>>>> Sun's Black box.
>>>> I got similar behavior when I exposed the filestore on the Sun's
>>>> thumper.
>>>>
>>>> Any help would be most appreciated.
>>>>
>>>> Thanks
>>>>
>>>> -------------------------------------------------------------------
>>>> Kontorinis Vasileios
>>>> Phd student, University of California San Diego
>>>> http://cseweb.ucsd.edu/~vkontori/ <http://cseweb.ucsd.edu/%7Evkontori/>
>>>> bkontorinis@gmail.com
>>>> -------------------------------------------------------------------
>>>>
>>>>
>>>> 2010/5/19 Shanti Subramanyam <shanti.subramanyam@gmail.com>
>>>>
>>>>  It's strange that multiple files seem to be complaining about it. Did
>>>>> you try disabling Suhosin ? Are you seeing a perceptible drop in memory
>>>>> after reaching steady state ?
>>>>>
>>>>> shanti
>>>>>
>>>>>
>>>>> On Wed, May 19, 2010 at 4:28 PM, Vasileios Kontorinis <
>>>>> bkontorinis@gmail.com> wrote:
>>>>>
>>>>>> Lately I get a bunch of these errors in my logs:
>>>>>>
>>>>>> [Wed May 19 22:26:37 2010] [error] [client 10.17.255.250] ALERT -
>>>>>> canary mismatch on efree() - heap overflow detected (attacker
>>>>>> '10.17.255.250', file '/var/www/oliophp/public_html/taggedEvents.php')
>>>>>> [Wed May 19 22:26:37 2010] [error] [client 10.17.255.250] ALERT -
>>>>>> canary mismatch on efree() - heap overflow detected (attacker
>>>>>> '10.17.255.250', file '/var/www/oliophp/public_html/taggedEvents.php')
>>>>>> [Wed May 19 22:26:37 2010] [error] [client 10.17.255.250] ALERT -
>>>>>> canary mismatch on efree() - heap overflow detected (attacker
>>>>>> '10.17.255.250', file '/var/www/oliophp/public_html/users.php')
>>>>>> [Wed May 19 22:26:37 2010] [error] [client 10.17.255.250] ALERT -
>>>>>> canary mismatch on efree() - heap overflow detected (attacker
>>>>>> '10.17.255.250', file '/var/www/oliophp/public_html/events.php')
>>>>>> [Wed May 19 22:26:37 2010] [error] [client 10.17.255.250] ALERT -
>>>>>> canary mismatch on efree() - heap overflow detected (attacker
>>>>>> '10.17.255.250', file '/var/www/oliophp/public_html/taggedEvents.php')
>>>>>>
>>>>>> According to blogs it is a php related issue. Suhosin patch detects
a
>>>>>> memory overflow and complains.
>>>>>> I was just wondering if the Olio php code is having any known mem.
>>>>>> leaks.
>>>>>>
>>>>>> My php version on ubuntu:
>>>>>> PHP 5.2.4-2ubuntu5 with Suhosin-Patch 0.9.6.2 (cli) (built: Feb 27
>>>>>> 2008 20:46:51)
>>>>>> Copyright (c) 1997-2007 The PHP Group
>>>>>> Zend Engine v2.2.0, Copyright (c) 1998-2007 Zend Technologies
>>>>>>
>>>>>> It's too bad that I do not get a line on the php files that cause
>>>>>> this.
>>>>>>
>>>>>>
>>>>>> Has anyone come across this one before?
>>>>>>
>>>>>>
>>>>>> -------------------------------------------------------------------
>>>>>> Kontorinis Vasileios
>>>>>> Phd student, University of California San Diego
>>>>>> San Diego, CA 92122
>>>>>> Cell. phone: (858) 717 6899
>>>>>> bkontorinis@gmail.com, vkontori@ucsd.edu
>>>>>> -------------------------------------------------------------------
>>>>>>
>>>>>
>>>>>
>>>>
>>>
>>
>

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