IO Error using Linux 5.16.12 and ZFS 2.1.2 about flexo

[nroi]

Hi @cuberoot74088, thanks for reporting this.

I've installed zfs and tried to reproduce this, but I wasn't able to. This is my config:

$ uname -a
Linux archWS 5.16.14-arch1-1 #1 SMP PREEMPT Fri, 11 Mar 2022 17:40:36 +0000 x86_64 GNU/Linux

$ zfs version
zfs-2.1.3-1
zfs-kmod-2.1.3-1

However, something that surprised me when I read your logs is the following:

Unable to serve request "": 

Notice the empty string "": This looks like the request does not include an actual file name. I was able to get the same error message by running curl against flexo and requesting an empty path, like this:

curl -v 'http://localhost:7878' > /dev/null

Apparently, there's some input validation lacking, because Flexo should return a 400 in such cases. But instead, it translates the empty request to the path /var/cache/flexo/pkg/ (or whatever your cache_directory is) and then assumes that the request can be served from cache, because the path already exists on the file system. This obviously does not work, so it runs into IO-errors.

However, I'm surprised how you ran into this error. Requests sent by pacman should always include a filename (afaik). Is this issue reproducible for you? Can you give me a pacman command or whatever command you executed that resulted in this error?

[cuberoot74088]

Hi @nroi,
thank you very much for your rapid response.
I have now also upgraded to

Linux  5.16.14-arch1-1 #1 SMP PREEMPT Fri, 11 Mar 2022 17:40:36 +0000 x86_64 GNU/Linux

zfs-2.1.3-1
zfs-kmod-2.1.3-1

and can confirm that it is working. 👍

So, I guess we can close it then.
Thank you very much for testing it on your side as well.