import uuid in Python always causes Illegal instruction (core dumped) on arm64's Windows + Ubuntu 18.04

[makotokato]

• Your Windows build number: Microsoft Windows [Version 10.0.17134.137]
• What you're doing and what's happening:

1. Setup WSL (Ubuntu 18.04) on Windows/arm64 (I tested on ASUS NovaGo)
2. Install python or python3
3. Run import uuid in Python shell.

makoto@DESKTOP:/mnt/c/$ python
Python 2.7.15rc1 (default, Apr 15 2018, 21:51:34)
[GCC 7.3.0] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import uuid
Illegal instruction (core dumped)

makoto@DESKTOP:/mnt/c/$ python3
Python 3.6.5 (default, Apr  1 2018, 05:46:30)
[GCC 7.3.0] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> import uuid
Illegal instruction (core dumped)

• What's wrong / what should be happening instead:
  This script causes Illegal instruction (core dumped). It works on x64 Windows + WSL.

• Strace of the failing command, if applicable: attaced as python.strace
  python.strace.zip

[ghost]

Use sudo when youre in outside wsl environment like /mnt or /media fs

[therealkenc]

I can't repro this here (this is arm64). There is no particular reason you need sudo when operating in /mnt so please don't perpetuate that.

[makotokato]

@Alternate-Egoist Even if I use sudo, this still occurs. At least, my environment (ASUS NovaGo / Windows ARM64) can reproduce this (The following log is after installing WSL).

Installing, this may take a few minutes...
Please create a default UNIX user account. The username does not need to match your Windows username.
For more information visit: https://aka.ms/wslusers
Enter new UNIX username: makoto
Enter new UNIX password:
Retype new UNIX password:
passwd: password updated successfully
Installation successful!
To run a command as administrator (user "root"), use "sudo <command>".
See "man sudo_root" for details.

makoto@DESKTOP-PTOHAAM:~$ python3
Python 3.6.5 (default, Apr  1 2018, 05:46:30)
[GCC 7.3.0] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> import uuid
Illegal instruction (core dumped)
makoto@DESKTOP-PTOHAAM:~$ uname -a
Linux DESKTOP-PTOHAAM 4.4.0-17134-Microsoft #137-Microsoft Thu Jun 14 18:46:00 PST 2018 aarch64 aarch64 aarch64 GNU/Linux
makoto@DESKTOP-PTOHAAM:~$ sudo python3 -c 'import uuid'
Illegal instruction (core dumped)
makoto@DESKTOP-PTOHAAM:~$

[therealkenc]

Disregard the sudo. It is going to be an arm64 thing. The strace doesn't tell much because the SIGILL happens entirely in userspace immediately after what looks like a successful mmap().

[...]
5335  read(5, "", 4096)                 = 0
5335  close(5)                          = 0
5335  mmap(NULL, 4096, PROT_READ|PROT_WRITE|PROT_EXEC, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7fdd956a0000
5335  --- SIGILL {si_signo=SIGILL, si_code=ILL_ILLOPN, si_addr=0x7fdd94f05de8} ---
5335  +++ killed by SIGILL (core dumped) +++

There was an Arm fix in 17692. Might give that a whirl. If you were feeling highly motivated you could deep dive with gdb. But you've provided a straightforward enough repro, and the devs can probably confirm easy enough.

[ed] Actually dotnet/core#1561 was SIGILL too. Smart money says try 17692.

[benhillis]

I believe @therealkenc is correct, this is an issue @Brian-Perkins fixed recently, we are currently in the process of backporting it to 1803.

[glandium]

we are currently in the process of backporting it to 1803.

I guess this was never backported to 1803, since I'm running an up-to-date arm64 1803, and it's still happening. And I don't seem to be able to update to 1809.

[Brian-Perkins]

This fix was actually just released (March 19) as part of KB4489894.

[glandium]

Mmmm the most recent Windows update gives me is KB4489868.

Edit: installing with the standalone updater fixed the issue (although now for some reason the signin screen is in English instead of Japanese like it was before).