# Problem with Quad machine

**URL:** https://deeptalk.lambda.ai/t/problem-with-quad-machine/508
**Category:** Uncategorized
**Created:** [September 17, 2018, 6:11am UTC](https://deeptalk.lambda.ai/t/problem-with-quad-machine/508 "2018-09-17T06:11:00Z")
**Posts on this page:** 2
**Page:** 1

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### Author: ![erfaneshrati](https://avatars.discourse-cdn.com/v4/letter/e/ecd19e/32.png) [@erfaneshrati](https://deeptalk.lambda.ai/u/erfaneshrati)
#### Post date: [September 17, 2018, 6:11am UTC](https://deeptalk.lambda.ai/t/problem-with-quad-machine/508/1 "2018-09-17T06:11:00Z")

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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]

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### Author: ![sabalaba](https://sea1.discourse-cdn.com/flex019/user_avatar/deeptalk.lambda.ai/sabalaba/32/4_2.png) [@sabalaba](https://deeptalk.lambda.ai/u/sabalaba)
#### Post date: [September 18, 2018, 7:07am UTC](https://deeptalk.lambda.ai/t/problem-with-quad-machine/508/2 "2018-09-18T07:07:27Z")

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Hi, what CPU do you have?