Missing kernel feature - debugging processes

[jhoareau]

Hi,

• The Apple Swift REPL cannot run on BashOnWindows because of a missing kernel feature - I believe the missing feature is the one associated with debugging processes.
• Expected results:

$ swift
  >

• Actual results:

$ swift
  error: failed to launch REPL process: process launch failed: 'A' packet returned an error: 8

• Windows Build number: 14393.0
• How to reproduce: Install the latest swift snapshot for Ubuntu 14.04 on https://swift.org with required dependencies (clang and libicu-dev), add swift to path, then try to run swift. Compiling a file does work correctly though, but not the REPL.

[stehufntdev]

Thanks for reporting the issue. Can you please collect an strace of the failing process so we can see why the application is failing?

[therealkenc]

#555 dup possibly.

[jhoareau]

@therealkenc Indeed, I believe it is the same issue. You can mark it as duplicate.

[therealkenc]

The failing syscall appears to be:

ptrace(PTRACE_TRACEME, 0, 0, 0) = -1 EPERM (Operation not permitted)

[sunitjoshi]

I've the same issue on Windows 10, with Ubuntu 14.04.5 LTS

[sunilmut]

Marking it duplicate as per the above comments.

[yanite]

I've the same issue on Windows 10, with Ubuntu 18.04 swift 5.0.1

[PseudonymPatel]

Still having this issue, it would be nice to see if something could be done about it

[viegasfh]

Any update on this?

[jhoareau]

This was fixed with WSL2 using a virtual machine instead of rewriting system calls.

[viegasfh]

Hi, @jhoareau !

Do you have a link I can follow to update this? O native Windows it does nothing. It runs and returns to the command prompt. On Ubuntu 20.04 on WSL2 it hangs.