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Posts by [AF>Libristes>Gentoo]JujuBickoille

1) Message boards : Questions/Problems/Bugs : Div 0 trouble ? (Message 1534)
Posted 25 May 2015 by [AF>Libristes>Gentoo]JujuBickoille
Post:
Hello,

I got strange things with one of my computer: many WU are failed. ( I dunno if I got this since long time :x )

After look at my computer, I can see that in dmesg :

[231078.578969] traps: lasievee_1.10_x[19613] trap divide error ip:473a95 sp:7fffe513e630 error:0 in lasievee_1.10_x86_64-pc-linux-gnu[400000+178000]
[231079.656548] traps: lasievee_1.10_x[19615] trap divide error ip:473a95 sp:7fffc01b1f40 error:0 in lasievee_1.10_x86_64-pc-linux-gnu[400000+178000]
[231080.764813] traps: lasievee_1.10_x[19617] trap divide error ip:473a95 sp:7fff99a3d340 error:0 in lasievee_1.10_x86_64-pc-linux-gnu[400000+178000]


It seem to be a div 0 trouble because I can reproduice with simple C program :

Laptop /tmp $ cat test.c
int main()
{
int a =0;
int b = 1337;
int c = b /a;
}
Laptop /tmp $ gcc test.c -o test
Laptop /tmp $ ./test
zsh: floating point exception ./test

and in dmesg :

Laptop /tmp $ dmesg | tail -n 1
[217680.748399] traps: test[18276] trap divide error ip:400513 sp:7fff52af41b0 error:0 in test[400000+1000]

The interessting question is why :)

here my BOINC's logs for one task :

23-May-2015 23:20:47 [NFS@Home] Starting task OPN_463442_32516_6 using lasievee version 110 in slot 6
23-May-2015 23:20:48 [NFS@Home] Started upload of OPN_463442_52892_6_0
23-May-2015 23:20:48 [NFS@Home] Computation for task OPN_463442_32516_6 finished
23-May-2015 23:20:48 [NFS@Home] Starting task OPN_463442_39032_4 using lasievee version 110 in slot 6
23-May-2015 23:20:49 [NFS@Home] Computation for task OPN_463442_39032_4 finished
23-May-2015 23:20:49 [NFS@Home] Starting task OPN_463442_51092_5 using lasievee version 110 in slot 6
23-May-2015 23:20:50 [NFS@Home] Finished upload of OPN_463442_51560_4_0
23-May-2015 23:20:50 [NFS@Home] Finished upload of OPN_463442_52892_6_0
23-May-2015 23:20:50 [NFS@Home] Started upload of OPN_463442_33128_4_0
23-May-2015 23:20:50 [NFS@Home] Started upload of OPN_463442_32516_6_0
23-May-2015 23:20:50 [NFS@Home] Computation for task OPN_463442_51092_5 finished
23-May-2015 23:20:50 [NFS@Home] Starting task OPN_463442_45616_4 using lasievee version 110 in slot 6
23-May-2015 23:20:51 [NFS@Home] Computation for task OPN_463442_45616_4 finished
23-May-2015 23:20:51 [NFS@Home] Starting task OPN_463442_33756_2 using lasievee version 110 in slot 6
23-May-2015 23:20:52 [NFS@Home] Finished upload of OPN_463442_33128_4_0
23-May-2015 23:20:52 [NFS@Home] Finished upload of OPN_463442_32516_6_0


The WU is : http://escatter11.fullerton.edu/nfs/result.php?resultid=44005061
and the computer is : http://escatter11.fullerton.edu/nfs/show_host_detail.php?hostid=1600008

If you need more informations of if you got idea of test to do : just tell me :)

Thank you for your help :)





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