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fish freezes for autocompletion of killall #4052

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@jacobsa

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@jacobsa
> fish --version
fish, version 2.5.0

> uname -a
Linux <redacted>.com 4.4.0-75-generic #96~14.04.1-Ubuntu SMP Thu Apr 20 11:06:30 UTC 2017 x86_64 x86_64 x86_64 GNU/Linux

> echo $TERM
screen-256color

Every time I attempt to use killall, the shell freezes, apparently trying to do autocompletion.

For example, I just typed killall vim, but got this:

> killall v

The shell remains entirely unresponsive to input until I press Ctrl-C twice, at which pont I can start typing again.

How can I debug this? Unfortunately it's not 100% reproducible; if I try again with killall vim right afterward, it works fine.

This does happen when I run fish with sh -c 'env HOME=$(mktemp -d) fish'.

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