Dec 11 12:03:01.367 INFO checking pbchekin/mutable-threads against try#aa9aa79c3c583aab59ac9134542d60a780c35e2e for pr-56677
Dec 11 12:03:01.367 INFO running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-56677/worker-6/try#aa9aa79c3c583aab59ac9134542d60a780c35e2e:/target:rw,Z" "-v" "/mnt/big/crater/work/local/test-source/worker-6/pr-56677/try#aa9aa79c3c583aab59ac9134542d60a780c35e2e:/source:ro,Z" "-v" "/mnt/big/crater/work/local/cargo-home:/cargo-home:ro,Z" "-v" "/mnt/big/crater/work/local/rustup-home:/rustup-home:ro,Z" "-e" "USER_ID=1000" "-e" "SOURCE_DIR=/source" "-e" "USER_ID=1000" "-e" "CMD=cargo +aa9aa79c3c583aab59ac9134542d60a780c35e2e-alt check --frozen --all --all-targets" "-e" "CARGO_TARGET_DIR=/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/cargo-home" "-e" "RUSTUP_HOME=/rustup-home" "-m" "1536M" "--network" "none" "crater"`
Dec 11 12:03:01.884 INFO [stdout] f924564106c944b9526bc2c3c09f06096af603feef472abb97e6da9f9f06df65
Dec 11 12:03:01.887 INFO running `"docker" "start" "-a" "f924564106c944b9526bc2c3c09f06096af603feef472abb97e6da9f9f06df65"`
Dec 11 12:03:03.236 INFO [stderr] usermod: no changes
Dec 11 12:03:03.388 INFO [stderr]     Checking net2 v0.2.33
Dec 11 12:03:03.388 INFO [stderr]     Checking nix v0.5.1
Dec 11 12:03:04.328 INFO [stderr]     Checking miow v0.1.5
Dec 11 12:03:06.437 INFO [stderr]     Checking mio v0.5.1
Dec 11 12:03:07.484 INFO [stderr]     Checking linebased v0.3.1
Dec 11 12:03:08.029 INFO [stderr]     Checking mute-test v0.1.0 (/source)
Dec 11 12:03:09.173 INFO [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 5.91s
Dec 11 12:03:09.178 INFO [stderr] su: No module specific data is present
Dec 11 12:03:09.855 INFO running `"docker" "inspect" "f924564106c944b9526bc2c3c09f06096af603feef472abb97e6da9f9f06df65"`
Dec 11 12:03:10.058 INFO running `"docker" "rm" "-f" "f924564106c944b9526bc2c3c09f06096af603feef472abb97e6da9f9f06df65"`
Dec 11 12:03:10.200 INFO [stdout] f924564106c944b9526bc2c3c09f06096af603feef472abb97e6da9f9f06df65