[INFO] fetching crate ustr 0.7.0...
[INFO] testing ustr-0.7.0 against 1.49.0 for beta-1.50-1
[INFO] extracting crate ustr 0.7.0 into /workspace/builds/worker-2/source
[INFO] validating manifest of crates.io crate ustr 0.7.0 on toolchain 1.49.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.49.0" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking crates.io crate ustr 0.7.0
[INFO] finished tweaking crates.io crate ustr 0.7.0
[INFO] tweaked toml for crates.io crate ustr 0.7.0 written to /workspace/builds/worker-2/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.49.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.49.0" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "rustops/crates-build-env@sha256:b8eeb62f26c39b23691079a6cb6de528d8e88b4d71a8f6b1d30f8ba7d9c16de9" "/opt/rustwide/cargo-home/bin/cargo" "+1.49.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] a6b85b7dfbab9cbd55c9d108c5576c8bac7e4c8effcabebf90d78773af8924fe
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "a6b85b7dfbab9cbd55c9d108c5576c8bac7e4c8effcabebf90d78773af8924fe", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "a6b85b7dfbab9cbd55c9d108c5576c8bac7e4c8effcabebf90d78773af8924fe", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a6b85b7dfbab9cbd55c9d108c5576c8bac7e4c8effcabebf90d78773af8924fe", kill_on_drop: false }`
[INFO] [stdout] a6b85b7dfbab9cbd55c9d108c5576c8bac7e4c8effcabebf90d78773af8924fe
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "rustops/crates-build-env@sha256:b8eeb62f26c39b23691079a6cb6de528d8e88b4d71a8f6b1d30f8ba7d9c16de9" "/opt/rustwide/cargo-home/bin/cargo" "+1.49.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 7a528d5b6a2db4b1b5e89b557b9e847df41b8e81f7c819a5fcd35b68840aea2d
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "7a528d5b6a2db4b1b5e89b557b9e847df41b8e81f7c819a5fcd35b68840aea2d", kill_on_drop: false }`
[INFO] [stderr]    Compiling ahash v0.3.8
[INFO] [stderr]    Compiling ustr v0.7.0 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.61s
[INFO] running `Command { std: "docker" "inspect" "7a528d5b6a2db4b1b5e89b557b9e847df41b8e81f7c819a5fcd35b68840aea2d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "7a528d5b6a2db4b1b5e89b557b9e847df41b8e81f7c819a5fcd35b68840aea2d", kill_on_drop: false }`
[INFO] [stdout] 7a528d5b6a2db4b1b5e89b557b9e847df41b8e81f7c819a5fcd35b68840aea2d
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "rustops/crates-build-env@sha256:b8eeb62f26c39b23691079a6cb6de528d8e88b4d71a8f6b1d30f8ba7d9c16de9" "/opt/rustwide/cargo-home/bin/cargo" "+1.49.0" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 75121fa8085bcb979aef9f48ee69efc3e34a4115dcef7ba73e8a509f89b63906
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "75121fa8085bcb979aef9f48ee69efc3e34a4115dcef7ba73e8a509f89b63906", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling rand_xoshiro v0.1.0
[INFO] [stderr]    Compiling string-interner v0.7.1
[INFO] [stderr]    Compiling bstr v0.2.14
[INFO] [stderr]    Compiling string_cache v0.7.5
[INFO] [stderr]    Compiling csv v1.1.5
[INFO] [stderr]    Compiling criterion v0.2.11
[INFO] [stderr]    Compiling ustr v0.7.0 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 10.55s
[INFO] running `Command { std: "docker" "inspect" "75121fa8085bcb979aef9f48ee69efc3e34a4115dcef7ba73e8a509f89b63906", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "75121fa8085bcb979aef9f48ee69efc3e34a4115dcef7ba73e8a509f89b63906", kill_on_drop: false }`
[INFO] [stdout] 75121fa8085bcb979aef9f48ee69efc3e34a4115dcef7ba73e8a509f89b63906
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "rustops/crates-build-env@sha256:b8eeb62f26c39b23691079a6cb6de528d8e88b4d71a8f6b1d30f8ba7d9c16de9" "/opt/rustwide/cargo-home/bin/cargo" "+1.49.0" "test" "--frozen", kill_on_drop: false }`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 8944df5e794fb401ba339a92cbc1199158471e0c99e66d65b50aef78c9c7d38a
[INFO] running `Command { std: "docker" "start" "-a" "8944df5e794fb401ba339a92cbc1199158471e0c99e66d65b50aef78c9c7d38a", kill_on_drop: false }`
[INFO] [stdout] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.07s
[INFO] [stdout] running 9 tests
[INFO] [stderr]      Running /opt/rustwide/target/debug/deps/ustr-cf742df690795afb
[INFO] [stdout] test tests::it_works ... ok
[INFO] [stdout] test tests::ord ... ok
[INFO] [stdout] test hash::test_hashing ... ok
[INFO] [stdout] test tests::partial_ord ... ok
[INFO] [stdout] test tests::c_str_works ... ok
[INFO] [stdout] test tests::test_into_str ... ok
[INFO] [stdout] test tests::empty_string ... FAILED
[INFO] [stderr] error: test failed, to rerun pass '--lib'
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `/opt/rustwide/target/debug/deps/ustr-cf742df690795afb` (signal: 11, SIGSEGV: invalid memory reference)
[INFO] running `Command { std: "docker" "inspect" "8944df5e794fb401ba339a92cbc1199158471e0c99e66d65b50aef78c9c7d38a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "8944df5e794fb401ba339a92cbc1199158471e0c99e66d65b50aef78c9c7d38a", kill_on_drop: false }`
[INFO] [stdout] 8944df5e794fb401ba339a92cbc1199158471e0c99e66d65b50aef78c9c7d38a