On Sun, Feb 03, 2019 at 07:37:55AM +0200, Amir Goldstein wrote: > Any access? or just execute? Can you share pr_debug output of access > to file that is not execute? Sure, same result (EPERM) there, here is the output and the changed Nix expression (in case you want to reproduce it): https://gist.github.com/aszlig/0b5ae4b03208a117b6f737772ff0eed8 I also added a stat on these files to check whether it happens there as well, but it only occurs when reading them. Here is the relevant pr_debug output: open(000000007ee735e6[/regular_top/l], 0100000) -> (0000000080f3d7f9, 00) open(00000000f7778f73[somesubdir/regular_sub/l], 0100000) -> (0000000080f3d7f9, 00) > FWIW, I ran unionmount-testsuite (tweaked) with 9p as lower as it passed, > so no obvious regressions with 9p as lower. Okay, one other thing that I can think of is that might be triggering the issue is that the Nix build process (on the host side) runs in a chroot with a few separate namespaces[1], including a mount namespace. a! [1]: https://github.com/NixOS/nix/blob/92d08c02c84be34ec0df56ed718526c382845d1a/src/libstore/build.cc#L2216-L2218 -- aszlig Universal dilettante
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