[INFO] fetching crate rust-cutil 1.0.25122401...
[INFO] testing rust-cutil-1.0.25122401 against master#2fd6efc32704647e64d3d646d21c4c68eae100e4 for pr-149852-1
[INFO] extracting crate rust-cutil 1.0.25122401 into /workspace/builds/worker-6-tc1/source
[INFO] started tweaking crates.io crate rust-cutil 1.0.25122401
[INFO] finished tweaking crates.io crate rust-cutil 1.0.25122401
[INFO] tweaked toml for crates.io crate rust-cutil 1.0.25122401 written to /workspace/builds/worker-6-tc1/source/Cargo.toml
[INFO] validating manifest of crates.io crate rust-cutil 1.0.25122401 on toolchain 2fd6efc32704647e64d3d646d21c4c68eae100e4
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+2fd6efc32704647e64d3d646d21c4c68eae100e4" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate crates.io crate rust-cutil 1.0.25122401 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" "+2fd6efc32704647e64d3d646d21c4c68eae100e4" "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/actify, error: No space left on device (os error 28)
[INFO] [stderr] error: failed to select a version for the requirement `serde_json = "^1.0.140"` (locked to 1.0.140)
[INFO] [stderr] candidate versions found which didn't match: 1.0.7, 1.0.6, 1.0.5, ...
[INFO] [stderr] location searched: crates.io index
[INFO] [stderr] required by package `rust-cutil v1.0.25122401 (/workspace/builds/worker-6-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/actify, error: No space left on device (os error 28)
error: failed to select a version for the requirement `serde_json = "^1.0.140"` (locked to 1.0.140)
candidate versions found which didn't match: 1.0.7, 1.0.6, 1.0.5, ...
location searched: crates.io index
required by package `rust-cutil v1.0.25122401 (/workspace/builds/worker-6-tc1/source)`
if you are looking for the prerelease package it needs to be specified explicitly
    serde_json = { version = "0.9.0-rc3" }