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Old 01-14-2010, 06:42 PM
Wojciech Ziniewicz
 
Default 64bit segfaults on debian

Hi,

In whole 2009 I was managing something about 20-30 servers and about
15-20% of those were 32bit and rest was on 64bit Debian.
For quite some time (1-2 years) I was not quite sure about this fact
but now is the time to ask...

After fully switching to 64bit (Debian mainly) I started to find this
messages in logfiles . Those segfaults are affecting random
applications - as well mencoder and imagemagick [1] on encoding
mediaservers on Etch as typical lamp servers with php and mysql [2]
also on Etch. When upgraded to Lenny , messages occured to have
another format [3] . What's interesting those segfaults messages (from
dmesg) have following properties :

- are only occuring on 64bit systems (while completely THE SAME 32bit
mirror server with the same load and even filesystem does not leave
those messages in dmesg)
- occur not randomly - certain actions like opening specified URL
cause the segfault
- are not disturbing the operation of given application ( the process
doesn't die )
- are affecting random applications - mainly every userspace application

The hardware that I use is 50% of HP DL380's and Intel Servers. So my
question is : is it normal ? am I experiencing something weird because
all of my applications work but show fake errors , and last but not
least - what are those messages ?


Regards,
Wojtek


[1]
mencoder[15010]: segfault at 0000000000000008 rip 00000000005edc4c rsp
00007fff531199d0

[2]
php5-cgi[3913] general protection rip:2acafe536be9 rsp:7fffac575c40 error:
sbox[4030]: segfault at 000000000001d3a0 rip 00002aaacc1fa050 rsp
00007fffdeb41dd8 error 4

[3]
php-cgi[3852]: segfault at 7f3089288a10 ip 00007f3089288a10 sp
00007fff97174408 error 4 in libpthread-2.3.6.so[7f308b687000+10000]
apache2[3658]: segfault at 7fff3f74cef8 ip 7f3837b9d2f7 sp
7fff3f74ce00 error 6 in libpcre.so.3.12.0[7f3837b8e000+25000]


--
Wojciech Ziniewicz
http://www.rfc-editor.org/rfc/rfc2324.txt


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Old 01-14-2010, 07:37 PM
Tinus Nijmeijers
 
Default 64bit segfaults on debian

On Thu, 2010-01-14 at 20:42 +0100, Wojciech Ziniewicz wrote:
> Hi,
>
> In whole 2009 I was managing something about 20-30 servers and about
> 15-20% of those were 32bit and rest was on 64bit Debian.
> For quite some time (1-2 years) I was not quite sure about this fact
> but now is the time to ask...
>
> After fully switching to 64bit (Debian mainly) I started to find this
> messages in logfiles . Those segfaults are affecting random
> applications - as well mencoder and imagemagick [1] on encoding
> mediaservers on Etch
> [1]
> mencoder[15010]: segfault at 0000000000000008 rip 00000000005edc4c rsp
> 00007fff531199d0

I have a 64bit etch xenserver and one (only one) of the domU's has these
errors:

apache2[3563]: segfault at 00007fff7b97fb44 rip 00002ba83203dc94 rsp
00007fff7b97fb20 error 6

all of the domU's are lamp and about the same config, but the one with
the segfaults is the only one that has imagemagick.


gr.
tinus



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Old 01-14-2010, 08:53 PM
Olivier Bonvalet
 
Default 64bit segfaults on debian

Hi,

I also have a lot of PHP segfault with etch and lenny (I only have
64bits servers).
My problems came from php, for example with objects using too much
memory in __destruct() methods : it's a memory corruption problem, which
was fixed only in PHP 5.2.8.


Olivier

Wojciech Ziniewicz a écrit :

Hi,

In whole 2009 I was managing something about 20-30 servers and about
15-20% of those were 32bit and rest was on 64bit Debian.
For quite some time (1-2 years) I was not quite sure about this fact
but now is the time to ask...

After fully switching to 64bit (Debian mainly) I started to find this
messages in logfiles . Those segfaults are affecting random
applications - as well mencoder and imagemagick [1] on encoding
mediaservers on Etch as typical lamp servers with php and mysql [2]
also on Etch. When upgraded to Lenny , messages occured to have
another format [3] . What's interesting those segfaults messages (from
dmesg) have following properties :

- are only occuring on 64bit systems (while completely THE SAME 32bit
mirror server with the same load and even filesystem does not leave
those messages in dmesg)
- occur not randomly - certain actions like opening specified URL
cause the segfault
- are not disturbing the operation of given application ( the process
doesn't die )
- are affecting random applications - mainly every userspace application

The hardware that I use is 50% of HP DL380's and Intel Servers. So my
question is : is it normal ? am I experiencing something weird because
all of my applications work but show fake errors , and last but not
least - what are those messages ?


Regards,
Wojtek


[1]
mencoder[15010]: segfault at 0000000000000008 rip 00000000005edc4c rsp
00007fff531199d0

[2]
php5-cgi[3913] general protection rip:2acafe536be9 rsp:7fffac575c40 error:
sbox[4030]: segfault at 000000000001d3a0 rip 00002aaacc1fa050 rsp
00007fffdeb41dd8 error 4

[3]
php-cgi[3852]: segfault at 7f3089288a10 ip 00007f3089288a10 sp
00007fff97174408 error 4 in libpthread-2.3.6.so[7f308b687000+10000]
apache2[3658]: segfault at 7fff3f74cef8 ip 7f3837b9d2f7 sp
7fff3f74ce00 error 6 in libpcre.so.3.12.0[7f3837b8e000+25000]






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Old 01-15-2010, 10:15 AM
Marcin Owsiany
 
Default 64bit segfaults on debian

On Thu, Jan 14, 2010 at 08:42:04PM +0100, Wojciech Ziniewicz wrote:
> - are only occuring on 64bit systems (while completely THE SAME 32bit
> mirror server with the same load and even filesystem does not leave
> those messages in dmesg)

Could it be that they also occured on the 32bit systems but did not
provoke the kernel to log a message? Maybe segfault handling code in
64bit kernels is different?

regards,
Marcin
--
Marcin Owsiany <porridge@debian.org> http://marcin.owsiany.pl/
GnuPG: 1024D/60F41216 FE67 DA2D 0ACA FC5E 3F75 D6F6 3A0D 8AA0 60F4 1216


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Old 01-18-2010, 03:10 PM
Wojciech Ziniewicz
 
Default 64bit segfaults on debian

2010/1/15 Marcin Owsiany <porridge@debian.org>:
> On Thu, Jan 14, 2010 at 08:42:04PM +0100, Wojciech Ziniewicz wrote:
>> - are only occuring on 64bit systems (while completely THE SAME 32bit
>> mirror server with the same load and even filesystem does not leave
>> those messages in dmesg)
>
> Could it be that they also occured on the 32bit systems but did not
> provoke the kernel to log a message? Maybe segfault handling code in
> 64bit kernels is different?

In my opinion it's the case of how do 32bit and 64bit kernels report
such messages. Like Marcin said, probably 64bit kernels are more
verbose but still I think it's somehow weird to see few segfaults per
minut in my dmesg all the time

Thank You all
regards

--
Wojciech Ziniewicz
http://www.rfc-editor.org/rfc/rfc2324.txt


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