[INFO] fetching crate nix 0.20.0...
[INFO] checking nix-0.20.0 against try#6f8a6450478f69b8510c8976ab6c2a70b3b0e47c for pr-84920
[INFO] extracting crate nix 0.20.0 into /workspace/builds/worker-13/source
[INFO] validating manifest of crates.io crate nix 0.20.0 on toolchain 6f8a6450478f69b8510c8976ab6c2a70b3b0e47c
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+6f8a6450478f69b8510c8976ab6c2a70b3b0e47c" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate nix 0.20.0
[INFO] removed 0 missing tests
[INFO] finished tweaking crates.io crate nix 0.20.0
[INFO] tweaked toml for crates.io crate nix 0.20.0 written to /workspace/builds/worker-13/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+6f8a6450478f69b8510c8976ab6c2a70b3b0e47c" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+6f8a6450478f69b8510c8976ab6c2a70b3b0e47c" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded caps v0.5.1
[INFO] [stderr]   Downloaded sysctl v0.1.4
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-13/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-13/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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:20528e8c29e4536546f0102ce88568b16ea7538393a33fcca951030f7af10457" "/opt/rustwide/cargo-home/bin/cargo" "+6f8a6450478f69b8510c8976ab6c2a70b3b0e47c" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] a1268ef17264fc83edc542f1f5dc77c7837e46586f0f40c45172593dd26ecc82
[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" "a1268ef17264fc83edc542f1f5dc77c7837e46586f0f40c45172593dd26ecc82", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "a1268ef17264fc83edc542f1f5dc77c7837e46586f0f40c45172593dd26ecc82", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a1268ef17264fc83edc542f1f5dc77c7837e46586f0f40c45172593dd26ecc82", kill_on_drop: false }`
[INFO] [stdout] a1268ef17264fc83edc542f1f5dc77c7837e46586f0f40c45172593dd26ecc82
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-13/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-13/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=forbid" "-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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:20528e8c29e4536546f0102ce88568b16ea7538393a33fcca951030f7af10457" "/opt/rustwide/cargo-home/bin/cargo" "+6f8a6450478f69b8510c8976ab6c2a70b3b0e47c" "check" "--frozen" "--all" "--all-targets" "--message-format=json", 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] 14a3e6cde1769c6d0b11599ccb49b127bf537d3532b8516b72903e1cb1bcaec2
[INFO] running `Command { std: "docker" "start" "-a" "14a3e6cde1769c6d0b11599ccb49b127bf537d3532b8516b72903e1cb1bcaec2", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.26
[INFO] [stderr]     Checking cfg-if v1.0.0
[INFO] [stderr]    Compiling unicode-xid v0.2.2
[INFO] [stderr]    Compiling bitflags v1.2.1
[INFO] [stderr]     Checking remove_dir_all v0.5.3
[INFO] [stderr]     Checking rand_os v0.1.3
[INFO] [stderr]     Checking errno v0.2.7
[INFO] [stderr]     Checking bytes v0.4.12
[INFO] [stderr]     Checking getrandom v0.2.2
[INFO] [stderr]     Checking rand v0.6.5
[INFO] [stderr]     Checking rand_core v0.6.2
[INFO] [stderr]     Checking nix v0.20.0 (/opt/rustwide/workdir)
[INFO] [stderr]     Checking rand_chacha v0.3.0
[INFO] [stderr]     Checking rand v0.8.3
[INFO] [stderr]    Compiling quote v1.0.9
[INFO] [stderr]    Compiling syn v1.0.72
[INFO] [stderr]     Checking tempfile v3.2.0
[INFO] [stdout] warning: dereferencing a null pointer
[INFO] [stdout]     --> src/macros.rs:215:14
[INFO] [stdout]      |
[INFO] [stdout] 215  |             &(*(ptr::null() as *const $ty)).$field as *const _ as usize
[INFO] [stdout]      |              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ this code causes undefined behavior when executed
[INFO] [stdout]      | 
[INFO] [stdout]     ::: src/sys/socket/mod.rs:1698:33
[INFO] [stdout]      |
[INFO] [stdout] 1698 |             let pathlen = len - offset_of!(sockaddr_un, sun_path);
[INFO] [stdout]      |                                 --------------------------------- in this macro invocation
[INFO] [stdout]      |
[INFO] [stdout]      = note: `#[warn(deref_nullptr)]` on by default
[INFO] [stdout]      = note: this warning originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: dereferencing a null pointer
[INFO] [stdout]    --> src/macros.rs:215:14
[INFO] [stdout]     |
[INFO] [stdout] 215 |             &(*(ptr::null() as *const $ty)).$field as *const _ as usize
[INFO] [stdout]     |              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ this code causes undefined behavior when executed
[INFO] [stdout]     | 
[INFO] [stdout]    ::: src/sys/socket/addr.rs:794:24
[INFO] [stdout]     |
[INFO] [stdout] 794 |                 (len + offset_of!(libc::sockaddr_un, sun_path)) as libc::socklen_t
[INFO] [stdout]     |                        --------------------------------------- in this macro invocation
[INFO] [stdout]     |
[INFO] [stdout]     = note: this warning originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]    Compiling thiserror-impl v1.0.24
[INFO] [stderr]     Checking thiserror v1.0.24
[INFO] [stderr]     Checking caps v0.5.1
[INFO] [stdout] warning: panic message is not a string literal
[INFO] [stdout]   --> test/test_poll.rs:14:34
[INFO] [stdout]    |
[INFO] [stdout] 14 |                 Err(e) => panic!(e)
[INFO] [stdout]    |                                  ^
[INFO] [stdout] ...
[INFO] [stdout] 26 |     let nfds = loop_while_eintr!(poll(&mut fds, 100));
[INFO] [stdout]    |                -------------------------------------- in this macro invocation
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(non_fmt_panic)]` on by default
[INFO] [stdout]    = note: this is no longer accepted in Rust 2021
[INFO] [stdout]    = note: this warning originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] help: add a "{}" format string to Display the message
[INFO] [stdout]    |
[INFO] [stdout] 14 |                 Err(e) => panic!("{}", e)
[INFO] [stdout]    |                                  ^^^^^
[INFO] [stdout] help: or use std::panic::panic_any instead
[INFO] [stdout]    |
[INFO] [stdout] 14 |                 Err(e) => std::panic::panic_any(e)
[INFO] [stdout]    |                           ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: panic message is not a string literal
[INFO] [stdout]   --> test/test_poll.rs:14:34
[INFO] [stdout]    |
[INFO] [stdout] 14 |                 Err(e) => panic!(e)
[INFO] [stdout]    |                                  ^
[INFO] [stdout] ...
[INFO] [stdout] 57 |     let nfds = loop_while_eintr!(ppoll(&mut fds, Some(timeout), sigset));
[INFO] [stdout]    |                --------------------------------------------------------- in this macro invocation
[INFO] [stdout]    |
[INFO] [stdout]    = note: this is no longer accepted in Rust 2021
[INFO] [stdout]    = note: this warning originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] help: add a "{}" format string to Display the message
[INFO] [stdout]    |
[INFO] [stdout] 14 |                 Err(e) => panic!("{}", e)
[INFO] [stdout]    |                                  ^^^^^
[INFO] [stdout] help: or use std::panic::panic_any instead
[INFO] [stdout]    |
[INFO] [stdout] 14 |                 Err(e) => std::panic::panic_any(e)
[INFO] [stdout]    |                           ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: dereferencing a null pointer
[INFO] [stdout]     --> src/macros.rs:215:14
[INFO] [stdout]      |
[INFO] [stdout] 215  |             &(*(ptr::null() as *const $ty)).$field as *const _ as usize
[INFO] [stdout]      |              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ this code causes undefined behavior when executed
[INFO] [stdout]      | 
[INFO] [stdout]     ::: src/sys/socket/mod.rs:1698:33
[INFO] [stdout]      |
[INFO] [stdout] 1698 |             let pathlen = len - offset_of!(sockaddr_un, sun_path);
[INFO] [stdout]      |                                 --------------------------------- in this macro invocation
[INFO] [stdout]      |
[INFO] [stdout] note: the lint level is defined here
[INFO] [stdout]     --> src/lib.rs:11:24
[INFO] [stdout]      |
[INFO] [stdout] 11   | #![cfg_attr(test, deny(warnings))]
[INFO] [stdout]      |                        ^^^^^^^^
[INFO] [stdout]      = note: `#[deny(deref_nullptr)]` implied by `#[deny(warnings)]`
[INFO] [stdout]      = note: this error originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: dereferencing a null pointer
[INFO] [stdout]    --> src/macros.rs:215:14
[INFO] [stdout]     |
[INFO] [stdout] 215 |             &(*(ptr::null() as *const $ty)).$field as *const _ as usize
[INFO] [stdout]     |              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ this code causes undefined behavior when executed
[INFO] [stdout]     | 
[INFO] [stdout]    ::: src/sys/socket/addr.rs:794:24
[INFO] [stdout]     |
[INFO] [stdout] 794 |                 (len + offset_of!(libc::sockaddr_un, sun_path)) as libc::socklen_t
[INFO] [stdout]     |                        --------------------------------------- in this macro invocation
[INFO] [stdout]     |
[INFO] [stdout]     = note: this error originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 2 previous errors
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `nix`
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `Command { std: "docker" "inspect" "14a3e6cde1769c6d0b11599ccb49b127bf537d3532b8516b72903e1cb1bcaec2", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "14a3e6cde1769c6d0b11599ccb49b127bf537d3532b8516b72903e1cb1bcaec2", kill_on_drop: false }`
[INFO] [stdout] 14a3e6cde1769c6d0b11599ccb49b127bf537d3532b8516b72903e1cb1bcaec2