[INFO] fetching crate vcontrol 0.4.0...
[INFO] testing vcontrol-0.4.0 against master#ad85bc524b1ad696e42061ad8338d382dffbdbe5 for pr-146237
[INFO] extracting crate vcontrol 0.4.0 into /workspace/builds/worker-4-tc1/source
[INFO] started tweaking crates.io crate vcontrol 0.4.0
[INFO] removed 0 missing examples
[INFO] finished tweaking crates.io crate vcontrol 0.4.0
[INFO] tweaked toml for crates.io crate vcontrol 0.4.0 written to /workspace/builds/worker-4-tc1/source/Cargo.toml
[INFO] validating manifest of crates.io crate vcontrol 0.4.0 on toolchain ad85bc524b1ad696e42061ad8338d382dffbdbe5
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+ad85bc524b1ad696e42061ad8338d382dffbdbe5" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate crates.io crate vcontrol 0.4.0 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+ad85bc524b1ad696e42061ad8338d382dffbdbe5" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr] warning: failed to write cache, path: /workspace/cargo-home/registry/index/index.crates.io-1949cf8c6b5b557f/.cache/ac/ti/actix-rt, error: No space left on device (os error 28)
[INFO] [stderr] error: failed to select a version for the requirement `serde_json = "^1"` (locked to 1.0.140)
[INFO] [stderr] candidate versions found which didn't match: 1.0.30, 1.0.29, 1.0.28, ...
[INFO] [stderr] location searched: crates.io index
[INFO] [stderr] required by package `vcontrol v0.4.0 (/workspace/builds/worker-4-tc1/source)`
[INFO] [stderr] if you are looking for the prerelease package it needs to be specified explicitly
[INFO] [stderr]     serde_json = { version = "0.9.0-rc3" }


command failed: exit status: 101

    Blocking waiting for file lock on package cache
    Updating crates.io index
warning: failed to write cache, path: /workspace/cargo-home/registry/index/index.crates.io-1949cf8c6b5b557f/.cache/ac/ti/actix-rt, error: No space left on device (os error 28)
error: failed to select a version for the requirement `serde_json = "^1"` (locked to 1.0.140)
candidate versions found which didn't match: 1.0.30, 1.0.29, 1.0.28, ...
location searched: crates.io index
required by package `vcontrol v0.4.0 (/workspace/builds/worker-4-tc1/source)`
if you are looking for the prerelease package it needs to be specified explicitly
    serde_json = { version = "0.9.0-rc3" }