# Problem with Quad machine

## post by erfaneshrati on Sep 17, 2018

Hi,

I recently bought Quad machine but my processes gets killed because of segmentation faults. I am also facing memory errors. What should I do?

pagesize is 4096

pagesizemask is 0xfffffffffffff000

want 1024MB (1073741824 bytes)

got 1024MB (1073741824 bytes), trying mlock …locked.

Loop 1/1:

Stuck Address : ok

Random Value : ok

Compare XOR : ok

Compare SUB : ok

Compare MUL : ok

Compare DIV : ok

Compare OR : ok

FAILURE: 0x6b3880b24ea28000 != 0x6b3880b24e228000 at offset 0x05d04d48.

Compare AND : Sequential Increment: ok

Solid Bits : testing 59FAILURE: 0x00800000 != 0x00000000 at offset 0x12eda550.

Block Sequential : testing 72FAILURE: 0x4848484848484848 != 0x4848484848c84848 at offset 0x1d895d48.

Checkerboard : ok

Bit Spread : testing 120FAILURE: 0x00800280 != 0x00000280 at offset 0x08d66510.

Bit Flip : testing 60FAILURE: 0x00000080 != 0x00800080 at offset 0x1ba1acc8.

Walking Ones : testing 10FAILURE: 0xfffffffffffffbff != 0xffffffffff7ffbff at offset 0x004d4308.

Walking Zeroes : ok

8-bit Writes : ok

16-bit Writes : ok

Here is the output of dmesg for segmentation faults:

[ 4706.307074] python[17694]: segfault at 7fb000809b40 ip 00007fb12a8c03c1 sp 00007fb02c9faa00 error 4 in libc-2.27.so[7fb12a82c000+1e7000]

[ 5451.930834] python[17728]: segfault at 800028 ip 00007fc693a6220e sp 00007ffe995694d0 error 4 in libc-2.27.so[7fc6939cd000+1e7000]

## post by sabalaba on Sep 18, 2018

Hi, what CPU do you have?