[INFO] crate ext4 0.6.0 is already in cache
[INFO] extracting crate ext4 0.6.0 into work/ex/beta-1.37-6/sources/1.36.0/reg/ext4/0.6.0
[INFO] extracting crate ext4 0.6.0 into work/ex/beta-1.37-6/sources/beta-2019-07-23/reg/ext4/0.6.0
[INFO] validating manifest of ext4-0.6.0 on toolchain 1.36.0
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.36.0" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of ext4-0.6.0 on toolchain beta-2019-07-23
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-07-23" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing ext4-0.6.0
[INFO] finished frobbing ext4-0.6.0
[INFO] frobbed toml for ext4-0.6.0 written to work/ex/beta-1.37-6/sources/1.36.0/reg/ext4/0.6.0/Cargo.toml
[INFO] started frobbing ext4-0.6.0
[INFO] finished frobbing ext4-0.6.0
[INFO] frobbed toml for ext4-0.6.0 written to work/ex/beta-1.37-6/sources/beta-2019-07-23/reg/ext4/0.6.0/Cargo.toml
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.36.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-07-23" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.36.0" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-07-23" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] testing ext4-0.6.0 against beta-2019-07-23 for beta-1.37-6
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.37-6/worker-6/beta-2019-07-23:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.37-6/sources/beta-2019-07-23/reg/ext4/0.6.0:/opt/crater/workdir:ro,Z" "-v" "/mnt/big/crater/work/local/cargo-home:/opt/crater/cargo-home:ro,Z" "-v" "/mnt/big/crater/work/local/rustup-home:/opt/crater/rustup-home:ro,Z" "-e" "USER_ID=1000" "-e" "SOURCE_DIR=/opt/crater/workdir" "-e" "MAP_USER_ID=1000" "-e" "CARGO_TARGET_DIR=/opt/crater/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/crater/cargo-home" "-e" "RUSTUP_HOME=/opt/crater/rustup-home" "-w" "/opt/crater/workdir" "-m" "1536M" "--network" "none" "rustops/crates-build-env" "/opt/crater/cargo-home/bin/cargo" "+beta-2019-07-23" "build" "--frozen"`
[INFO] [stdout] 68bece45359a3d629d44a3c6487d61f16ebbd672eaf5ca406abef3933d9e8fed
[INFO] running `"docker" "start" "-a" "68bece45359a3d629d44a3c6487d61f16ebbd672eaf5ca406abef3933d9e8fed"`
[INFO] [stderr]    Compiling ext4 v0.6.0 (/opt/crater/workdir)
[INFO] [stderr] error: failed to run custom build command for `ext4 v0.6.0 (/opt/crater/workdir)`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `/opt/crater/target/debug/build/ext4-a86854a8503f5c7b/build-script-build` (exit code: 101)
[INFO] [stderr] --- stderr
[INFO] [stderr] tar: all-types.img: Cannot open: Read-only file system
[INFO] [stderr] tar: all-types-32.img: Cannot open: Read-only file system
[INFO] [stderr] tar: all-types-tiny.img: Cannot open: Read-only file system
[INFO] [stderr] tar: all-types-big.img: Cannot open: Read-only file system
[INFO] [stderr] tar: all-types-big-32.img: Cannot open: Read-only file system
[INFO] [stderr] tar: Exiting with failure status due to previous errors
[INFO] [stderr] thread 'main' panicked at 'assertion failed: process::Command::new("tar").args(&["-C", DEST, "-xf",
[INFO] [stderr]                                     "scripts/generate-images/images.tgz"]).spawn()?.wait()?.success()', build.rs:12:5
[INFO] [stderr] stack backtrace:
[INFO] [stderr]    0:     0x55fae690109b - backtrace::backtrace::libunwind::trace::h5dfa5d4c5feed6dc
[INFO] [stderr]                                at /cargo/registry/src/github.com-1ecc6299db9ec823/backtrace-0.3.29/src/backtrace/libunwind.rs:88
[INFO] [stderr]    1:     0x55fae690109b - backtrace::backtrace::trace_unsynchronized::hb731fe64f3fa469f
[INFO] [stderr]                                at /cargo/registry/src/github.com-1ecc6299db9ec823/backtrace-0.3.29/src/backtrace/mod.rs:66
[INFO] [stderr]    2:     0x55fae690109b - std::sys_common::backtrace::_print::hf4fd45fe7ae4a250
[INFO] [stderr]                                at src/libstd/sys_common/backtrace.rs:47
[INFO] [stderr]    3:     0x55fae690109b - std::sys_common::backtrace::print::h31646c3786c57441
[INFO] [stderr]                                at src/libstd/sys_common/backtrace.rs:36
[INFO] [stderr]    4:     0x55fae690109b - std::panicking::default_hook::{{closure}}::hda785e768c746ae7
[INFO] [stderr]                                at src/libstd/panicking.rs:200
[INFO] [stderr]    5:     0x55fae6900d77 - std::panicking::default_hook::h0c4b76f338614ef1
[INFO] [stderr]                                at src/libstd/panicking.rs:214
[INFO] [stderr]    6:     0x55fae6901760 - std::panicking::rust_panic_with_hook::h096dff2cb12b67ce
[INFO] [stderr]                                at src/libstd/panicking.rs:477
[INFO] [stderr]    7:     0x55fae68f6e24 - std::panicking::begin_panic::h34a9a1487d388678
[INFO] [stderr]                                at /rustc/61d1607e0f6a18bb4897d6f9b10abeac9e11eb8e/src/libstd/panicking.rs:411
[INFO] [stderr]    8:     0x55fae68f7ec0 - build_script_build::extract_test_images::hcddb40e25ab89a47
[INFO] [stderr]                                at /opt/crater/workdir/build.rs:12
[INFO] [stderr]    9:     0x55fae68f809e - build_script_build::main::h763540c1c47e1842
[INFO] [stderr]                                at /opt/crater/workdir/build.rs:24
[INFO] [stderr]   10:     0x55fae68f1990 - std::rt::lang_start::{{closure}}::hc77ba6535bb093e8
[INFO] [stderr]                                at /rustc/61d1607e0f6a18bb4897d6f9b10abeac9e11eb8e/src/libstd/rt.rs:64
[INFO] [stderr]   11:     0x55fae69011b3 - std::rt::lang_start_internal::{{closure}}::h055e1fdc5578d418
[INFO] [stderr]                                at src/libstd/rt.rs:49
[INFO] [stderr]   12:     0x55fae69011b3 - std::panicking::try::do_call::h480cafa68c9928b4
[INFO] [stderr]                                at src/libstd/panicking.rs:296
[INFO] [stderr]   13:     0x55fae69074ea - __rust_maybe_catch_panic
[INFO] [stderr]                                at src/libpanic_unwind/lib.rs:82
[INFO] [stderr]   14:     0x55fae6901c6d - std::panicking::try::he0549d0299de204a
[INFO] [stderr]                                at src/libstd/panicking.rs:275
[INFO] [stderr]   15:     0x55fae6901c6d - std::panic::catch_unwind::h422dc2db98f03517
[INFO] [stderr]                                at src/libstd/panic.rs:394
[INFO] [stderr]   16:     0x55fae6901c6d - std::rt::lang_start_internal::h121de03325a3f900
[INFO] [stderr]                                at src/libstd/rt.rs:48
[INFO] [stderr]   17:     0x55fae68f1969 - std::rt::lang_start::hf7abd2db6a787af4
[INFO] [stderr]                                at /rustc/61d1607e0f6a18bb4897d6f9b10abeac9e11eb8e/src/libstd/rt.rs:64
[INFO] [stderr]   18:     0x55fae68f80da - main
[INFO] [stderr]   19:     0x7f91516c12e1 - __libc_start_main
[INFO] [stderr]   20:     0x55fae68ee6da - _start
[INFO] [stderr]   21:                0x0 - <unknown>
[INFO] [stderr] 
[INFO] running `"docker" "inspect" "68bece45359a3d629d44a3c6487d61f16ebbd672eaf5ca406abef3933d9e8fed"`
[INFO] running `"docker" "rm" "-f" "68bece45359a3d629d44a3c6487d61f16ebbd672eaf5ca406abef3933d9e8fed"`
[INFO] [stdout] 68bece45359a3d629d44a3c6487d61f16ebbd672eaf5ca406abef3933d9e8fed