Almost all nix commands hang indefinitely

Describe the bug

Every time I try to run any command, like:

• nix-shell
• nix-store --gc
• nix-collect-garbage

It instantly becomes unresponsive and cannot be terminated by using Ctrl+C or kill -SIGTERM but only with kill -SIGKILL.

Additional context

By running a sample command with strace (strace --output=strace.txt nix-store --gc --print-dead -vvvvv) and inspecting the output, the following two lines continuously repeat:

mkdir("/nix/var/nix/db/db.sqlite.lock", 0777) = -1 EEXIST (File exists)
clock_nanosleep(CLOCK_REALTIME, 0, {tv_sec=0, tv_nsec=100000000}, NULL) = 0

After removing the folder /nix/var/nix/db/db.sqlite.lock the commands started working again as expected.

I can't deduce if the folder was there because of a failed previous command or for another reason.

Steps To Reproduce

1. Ensure the folder /nix/var/nix/db/db.sqlite.lock exists
2. Run any nix command
3. Command hangs indefinitely

Expected behavior

Command probably shouldn't hang if the /nix/var/nix/db/db.sqlite.lock folder already exists.

nix-env --version output

$ nix-env --version
nix-env (Nix) 2.15.0