Hang while running ls on a directory containing a symlink

$ swh fs mount /tmp/foobar/
$ ls -lh /tmp/foobar/origin/https%3A%2F%2Fgithub.com%2FProgVal%2FLimnoria/2020-03-06/snapshot/refs%2Fheads%2Ftesting/root/

-> it hangs forever.

after a while, I killed swh-fuse, and got this:

ls: cannot read symbolic link '/tmp/foobar/origin/https%3A%2F%2Fgithub.com%2FProgVal%2FLimnoria/2020-03-06/snapshot/refs%2Fheads%2Ftesting/root/supybot': Software caused connection abort
ls: cannot access '/tmp/foobar/origin/https%3A%2F%2Fgithub.com%2FProgVal%2FLimnoria/2020-03-06/snapshot/refs%2Fheads%2Ftesting/root/test': Transport endpoint is not connected
ls: reading directory '/tmp/foobar/origin/https%3A%2F%2Fgithub.com%2FProgVal%2FLimnoria/2020-03-06/snapshot/refs%2Fheads%2Ftesting/root/': Transport endpoint is not connected
total 0
-rw-r--r-- 1 dev dev 1.3K Dec  2 15:12 CONTRIBUTING.md
-rw-r--r-- 1 dev dev  70K Dec  2 15:12 ChangeLog
-rw-r--r-- 1 dev dev 1.7K Dec  2 15:12 LICENSE.md
-rw-r--r-- 1 dev dev  117 Dec  2 15:12 MANIFEST.in
-rw-r--r-- 1 dev dev  983 Dec  2 15:12 Makefile
-rw-r--r-- 1 dev dev 2.3K Dec  2 15:12 README.md
-rw-r--r-- 1 dev dev  17K Dec  2 15:12 RELNOTES
dr-xr-xr-x 1 dev dev    0 Dec  2 15:12 locales
dr-xr-xr-x 1 dev dev    0 Dec  2 15:12 man
dr-xr-xr-x 1 dev dev    0 Dec  2 15:12 plugins
-rw-r--r-- 1 dev dev   90 Dec  2 15:12 requirements.txt
dr-xr-xr-x 1 dev dev    0 Dec  2 15:12 sandbox
dr-xr-xr-x 1 dev dev    0 Dec  2 15:12 scripts
-rw-r--r-- 1 dev dev 8.8K Dec  2 15:12 setup.py
dr-xr-xr-x 1 dev dev    0 Dec  2 15:12 src
l--------- 1 dev dev    3 Dec  2 15:12 supybot
d????????? ? ?   ?      ?            ? test

so it looks like the hang was caused by reading supybot, which is a symlink to a dir.

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Migrated from T2842 (view on Phabricator)