# Can't start Slicer on Linux on one machine

**URL:** <https://discourse.slicer.org/t/cant-start-slicer-on-linux-on-one-machine/8175>\
**Category:** Support\
**Created:** [August 26, 2019, 7:12am UTC](https://discourse.slicer.org/t/cant-start-slicer-on-linux-on-one-machine/8175 "2019-08-26T07:12:06Z")\
**Posts on this page:** 1\
**Showing post:** 25

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**Author:** ![lassoan](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/lassoan/32/13_2.png) [@lassoan](https://discourse.slicer.org/u/lassoan)\
**Post date:** [September 19, 2019, 6:32pm UTC](https://discourse.slicer.org/t/cant-start-slicer-on-linux-on-one-machine/8175/25 "2019-09-19T18:32:15Z")

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> [@chir.set](#):
>
> [21639.829126] traps: SlicerApp-real[15453] trap invalid opcode ip:7f8aa07fa1c8 sp:7ffce616fca8 error:0 in libitkgdcmcharls-5.0.so.1[7f8aa07e4000+84000]

I think we run into the same problem on a very old computer (with Intel Core i7-3770 CPU) running Windows 10.

Slicer does not start but instead this error is shown in a popup:

```
The application was unable to start correctly (0xc0000142). Click OK to close the application

```

Windows application log tells that it is an exception 0xc000001d (Illegal instruction) in ITKIOGDCM-5.1.dll. Attaching a debugger and looking at the disassembly I found that indeed there was an `shlx` instruction where the exception was thrown, which is a [BMI2 instruction](https://en.wikipedia.org/wiki/Bit_Manipulation_Instruction_Sets#BMI2_(Bit_Manipulation_Instruction_Set_2)) that is not supported in 3rd-generation (3xxx, Ivy Bridge) CPUs but only in 4th generation (4xxx, Haswell) and later.

@chir.set Can you confirm that you had this problem on a 3rd-generation CPU?

We should either change build options to disable using BMI2 instruction set or check CPU type in the launcher and show a warning if non-compatible CPU is found. I’ve created an issue for this to make sure we follow up: [Slicer fails to start in Intel Ivy Bridge or older CPUs · Issue #4712 · Slicer/Slicer · GitHub](https://issues.slicer.org/view.php?id=4712)

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