[INFO] fetching crate vhost-user-backend 0.11.0...
[INFO] checking vhost-user-backend-0.11.0 against master#35936c4839dd272646394779d151e060d0f6b3ac for pr-122960-1
[INFO] extracting crate vhost-user-backend 0.11.0 into /workspace/builds/worker-1-tc1/source
[INFO] validating manifest of crates.io crate vhost-user-backend 0.11.0 on toolchain 35936c4839dd272646394779d151e060d0f6b3ac
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+35936c4839dd272646394779d151e060d0f6b3ac" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate vhost-user-backend 0.11.0
[INFO] finished tweaking crates.io crate vhost-user-backend 0.11.0
[INFO] tweaked toml for crates.io crate vhost-user-backend 0.11.0 written to /workspace/builds/worker-1-tc1/source/Cargo.toml
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+35936c4839dd272646394779d151e060d0f6b3ac" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+35936c4839dd272646394779d151e060d0f6b3ac" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded virtio-bindings v0.2.2
[INFO] [stderr]   Downloaded arc-swap v1.7.1
[INFO] [stderr]   Downloaded vmm-sys-util v0.11.2
[INFO] [stderr]   Downloaded virtio-queue v0.10.0
[INFO] [stderr]   Downloaded vm-memory v0.13.1
[INFO] [stderr]   Downloaded vhost v0.9.0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc1/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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+35936c4839dd272646394779d151e060d0f6b3ac" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 61741d115dcfdba26d19987b6dc8a3ba3b965966004cfd248bf22b2e97dd252a
[INFO] running `Command { std: "docker" "start" "-a" "61741d115dcfdba26d19987b6dc8a3ba3b965966004cfd248bf22b2e97dd252a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "61741d115dcfdba26d19987b6dc8a3ba3b965966004cfd248bf22b2e97dd252a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "61741d115dcfdba26d19987b6dc8a3ba3b965966004cfd248bf22b2e97dd252a", kill_on_drop: false }`
[INFO] [stdout] 61741d115dcfdba26d19987b6dc8a3ba3b965966004cfd248bf22b2e97dd252a
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc1/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" "RUSTDOCFLAGS=--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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+35936c4839dd272646394779d151e060d0f6b3ac" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 520ee20e20675cea8dfd346ee9be4f074825d7768f33638822cfa830b0f6b2f1
[INFO] running `Command { std: "docker" "start" "-a" "520ee20e20675cea8dfd346ee9be4f074825d7768f33638822cfa830b0f6b2f1", kill_on_drop: false }`
[INFO] [stderr]     Checking arc-swap v1.7.1
[INFO] [stderr]     Checking log v0.4.21
[INFO] [stderr]     Checking virtio-bindings v0.2.2
[INFO] [stderr]    Compiling syn v2.0.55
[INFO] [stderr]     Checking vmm-sys-util v0.11.2
[INFO] [stderr]     Checking nix v0.27.1
[INFO] [stderr]    Compiling thiserror-impl v1.0.58
[INFO] [stderr]     Checking thiserror v1.0.58
[INFO] [stderr]     Checking vm-memory v0.13.1
[INFO] [stderr]     Checking virtio-queue v0.10.0
[INFO] [stderr]     Checking vhost v0.9.0
[INFO] [stderr]     Checking vhost-user-backend v0.11.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: the item `Result` is imported redundantly
[INFO] [stdout]   --> src/vring.rs:12:5
[INFO] [stdout]    |
[INFO] [stdout] 12 | use std::result::Result;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   --> /rustc/35936c4839dd272646394779d151e060d0f6b3ac/library/std/src/prelude/mod.rs:129:13
[INFO] [stdout]    |
[INFO] [stdout]    = note: the item `Result` is already defined here
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `Mutex` is imported redundantly
[INFO] [stdout]    --> src/backend.rs:394:9
[INFO] [stdout]     |
[INFO] [stdout] 391 |     use super::*;
[INFO] [stdout]     |         -------- the item `Mutex` is already imported here
[INFO] [stdout] ...
[INFO] [stdout] 394 |     use std::sync::Mutex;
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `EventFd` is imported redundantly
[INFO] [stdout]    --> src/event_loop.rs:233:9
[INFO] [stdout]     |
[INFO] [stdout] 230 |     use super::*;
[INFO] [stdout]     |         -------- the item `EventFd` is already imported here
[INFO] [stdout] ...
[INFO] [stdout] 233 |     use vmm_sys_util::eventfd::EventFd;
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `Result` is imported redundantly
[INFO] [stdout]   --> src/vring.rs:12:5
[INFO] [stdout]    |
[INFO] [stdout] 12 | use std::result::Result;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   --> /rustc/35936c4839dd272646394779d151e060d0f6b3ac/library/std/src/prelude/mod.rs:129:13
[INFO] [stdout]    |
[INFO] [stdout]    = note: the item `Result` is already defined here
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `EventFd` is imported redundantly
[INFO] [stdout]    --> src/vring.rs:505:9
[INFO] [stdout]     |
[INFO] [stdout] 502 |     use super::*;
[INFO] [stdout]     |         -------- the item `EventFd` is already imported here
[INFO] [stdout] ...
[INFO] [stdout] 505 |     use vmm_sys_util::eventfd::EventFd;
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `GuestMemoryAtomic` is imported redundantly
[INFO] [stdout]    --> src/lib.rs:248:35
[INFO] [stdout]     |
[INFO] [stdout] 243 |     use super::*;
[INFO] [stdout]     |         -------- the item `GuestMemoryAtomic` is already imported here
[INFO] [stdout] ...
[INFO] [stdout] 248 |     use vm_memory::{GuestAddress, GuestMemoryAtomic, GuestMemoryMmap};
[INFO] [stdout]     |                                   ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `GuestMemoryMmap` is imported redundantly
[INFO] [stdout]    --> src/lib.rs:248:54
[INFO] [stdout]     |
[INFO] [stdout] 243 |     use super::*;
[INFO] [stdout]     |         -------- the item `GuestMemoryMmap` is already imported here
[INFO] [stdout] ...
[INFO] [stdout] 248 |     use vm_memory::{GuestAddress, GuestMemoryAtomic, GuestMemoryMmap};
[INFO] [stdout]     |                                                      ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 6 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 8.88s
[INFO] running `Command { std: "docker" "inspect" "520ee20e20675cea8dfd346ee9be4f074825d7768f33638822cfa830b0f6b2f1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "520ee20e20675cea8dfd346ee9be4f074825d7768f33638822cfa830b0f6b2f1", kill_on_drop: false }`
[INFO] [stdout] 520ee20e20675cea8dfd346ee9be4f074825d7768f33638822cfa830b0f6b2f1