Cargo in docker can't find Cargo.toml

[jhfrontz]

As of nightly-2019-10-21, cargo seems to be unable to find the Cargo.toml file in the current working directory of a docker-based gitlab CI job:

$ pwd
/builds/jhf/functionary
$ head -1 /builds/jhf/functionary/Cargo.toml
###
$ CARGO_LOG="trace" cargo build
[2019-10-22T20:16:20Z DEBUG cargo] exit_with_error; err=CliError { error: Some(ErrorMessage { msg: "could not find `Cargo.toml` in `/builds/jhf/functionary` or any parent directory" }), unknown: false, exit_code: 101 }
error: could not find `Cargo.toml` in `/builds/jhf/functionary` or any parent directory

(maybe related to #65662 ?)

[jonas-schievink]

Can you run this with strace to find out whether this is due to statx?

[jhfrontz]

Can you run this with strace to find out whether this is due to statx?

I ran with strace but I'm not sure what I'm looking for -- I don't see any statx calls in the trace, but I do see a bunch of ENOENT (and other failures). It's hard to tell which are happening "normally" as part of checking for things. I'll work on sanitizing a trace to post.

[jhfrontz]

strace output: https://pastebin.com/KsZFkaAn

[sfackler]

syscall_332 is statx, so this is a duplicate of #65662