Den 2015-12-06 16:34, skrev Vegard Nossum:
> Hi,
>
> I've been running into some odd crashes when starting my UML instance
> from Python. This is my script:
>
> import subprocess
> subprocess.check_call(['path/to/vmlinux', 'mem=2048M',
> 'rootfstype=hostfs', 'rw', 'init=/bin/bash'])
>
> [    1.880000] winch_thread : TIOCSCTTY failed on fd 1 err = 1
>

I suspect subprocess.check_call() uses pipes and not pty/tty when 
creating this process. Same problem probably happens if do you something 
like

cat /dev/null | path/to/vmlinux mem=2048M rootfstype=hostfs rw 
init=/bin/bash 2>&1 >log



Stian

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