$ fish --version
fish, version 3.0.0
$ uname -a
Linux airulsf01 3.10.0-693.el7.x86_64 #1 SMP Thu Jul 6 19:56:57 EDT 2017 x86_64 x86_64 x86_64 GNU/Linux
$ echo $TERM
xterm-256color
$ sh -c 'env HOME=$(mktemp -d) fish'
Segmentation fault

Segfault is also produced just by running fish.

I don't have an easy way to test the issue with 2.7.1 as I am running on a server without root, where I installed fish using nix, itself installed via proot in ~/.nix.

This gist contains outputs of the following commands:

• nix log nixpkgs.fish
• fish -d 5
• gdb fish
• strace fish

Note that the output of gdb fish is most likely unhelpful as it seems that fish detects that it is launched in a non-interactive environment (probably due to gdb) and does something weird.

Also note that I have also tried to install fish on the same machine using Linuxbrew, and it also failed with a segfault.