[INFO] cloning repository https://github.com/plavelo/placc
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/plavelo/placc" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fplavelo%2Fplacc", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fplavelo%2Fplacc'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] cf924b388cb71a1f907d47fd307817b94af82196
[INFO] testing plavelo/placc against 1.77.0 for beta-1.78-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fplavelo%2Fplacc" "/workspace/builds/worker-2-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-2-tc1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/plavelo/placc on toolchain 1.77.0
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.77.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/plavelo/placc
[INFO] finished tweaking git repo https://github.com/plavelo/placc
[INFO] tweaked toml for git repo https://github.com/plavelo/placc written to /workspace/builds/worker-2-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/plavelo/placc 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" "+1.77.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-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" "+1.77.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 8e099f4813f61367cd9317a128ccb3e779f4d307ac882f4eb2ed5f52dca74b86
[INFO] running `Command { std: "docker" "start" "-a" "8e099f4813f61367cd9317a128ccb3e779f4d307ac882f4eb2ed5f52dca74b86", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "8e099f4813f61367cd9317a128ccb3e779f4d307ac882f4eb2ed5f52dca74b86", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "8e099f4813f61367cd9317a128ccb3e779f4d307ac882f4eb2ed5f52dca74b86", kill_on_drop: false }`
[INFO] [stdout] 8e099f4813f61367cd9317a128ccb3e779f4d307ac882f4eb2ed5f52dca74b86
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-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=warn" "-e" "RUSTDOCFLAGS=--cap-lints=warn" "-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" "+1.77.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 0c3473362bdb1ebef512b80d4f6f15cb5bfa52df0aae5a0679f10cbe53f8b45c
[INFO] running `Command { std: "docker" "start" "-a" "0c3473362bdb1ebef512b80d4f6f15cb5bfa52df0aae5a0679f10cbe53f8b45c", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.24
[INFO] [stderr]    Compiling version_check v0.9.2
[INFO] [stderr]    Compiling unicode-xid v0.2.1
[INFO] [stderr]    Compiling syn v1.0.60
[INFO] [stderr]    Compiling autocfg v1.0.1
[INFO] [stderr]    Compiling memchr v2.3.4
[INFO] [stderr]    Compiling libc v0.2.82
[INFO] [stderr]    Compiling unicode-segmentation v1.7.1
[INFO] [stderr]    Compiling bitflags v1.2.1
[INFO] [stderr]    Compiling lazy_static v1.4.0
[INFO] [stderr]    Compiling hashbrown v0.9.1
[INFO] [stderr]    Compiling unicode-width v0.1.8
[INFO] [stderr]    Compiling vec_map v0.8.2
[INFO] [stderr]    Compiling strsim v0.10.0
[INFO] [stderr]    Compiling regex-syntax v0.6.22
[INFO] [stderr]    Compiling os_str_bytes v2.4.0
[INFO] [stderr]    Compiling thread_local v1.1.0
[INFO] [stderr]    Compiling textwrap v0.12.1
[INFO] [stderr]    Compiling termcolor v1.1.2
[INFO] [stderr]    Compiling proc-macro-error-attr v1.0.4
[INFO] [stderr]    Compiling proc-macro-error v1.0.4
[INFO] [stderr]    Compiling indexmap v1.6.1
[INFO] [stderr]    Compiling heck v0.3.2
[INFO] [stderr]    Compiling aho-corasick v0.7.15
[INFO] [stderr]    Compiling quote v1.0.8
[INFO] [stderr]    Compiling atty v0.2.14
[INFO] [stderr]    Compiling regex v1.4.3
[INFO] [stderr]    Compiling clap_derive v3.0.0-beta.2
[INFO] [stderr]    Compiling clap v3.0.0-beta.2
[INFO] [stderr]    Compiling pcc v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 12.88s
[INFO] running `Command { std: "docker" "inspect" "0c3473362bdb1ebef512b80d4f6f15cb5bfa52df0aae5a0679f10cbe53f8b45c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "0c3473362bdb1ebef512b80d4f6f15cb5bfa52df0aae5a0679f10cbe53f8b45c", kill_on_drop: false }`
[INFO] [stdout] 0c3473362bdb1ebef512b80d4f6f15cb5bfa52df0aae5a0679f10cbe53f8b45c
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-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=warn" "-e" "RUSTDOCFLAGS=--cap-lints=warn" "-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" "+1.77.0" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] e4e547f92a257bd8ce34de7bf5d4740986d7afa6c88b89fe0464e029d5817291
[INFO] running `Command { std: "docker" "start" "-a" "e4e547f92a257bd8ce34de7bf5d4740986d7afa6c88b89fe0464e029d5817291", kill_on_drop: false }`
[INFO] [stderr]    Compiling getrandom v0.2.2
[INFO] [stderr]    Compiling cfg-if v1.0.0
[INFO] [stderr]    Compiling predicates-core v1.0.1
[INFO] [stderr]    Compiling ppv-lite86 v0.2.10
[INFO] [stderr]    Compiling doc-comment v0.3.3
[INFO] [stderr]    Compiling treeline v0.1.0
[INFO] [stderr]    Compiling difference v2.0.0
[INFO] [stderr]    Compiling wait-timeout v0.2.0
[INFO] [stderr]    Compiling remove_dir_all v0.5.3
[INFO] [stderr]    Compiling predicates-tree v1.0.1
[INFO] [stderr]    Compiling predicates v1.0.6
[INFO] [stderr]    Compiling rand_core v0.6.1
[INFO] [stderr]    Compiling uuid v0.8.2
[INFO] [stderr]    Compiling rand_chacha v0.3.0
[INFO] [stderr]    Compiling assert_cmd v1.0.2
[INFO] [stderr]    Compiling rand v0.8.2
[INFO] [stderr]    Compiling tempfile v3.2.0
[INFO] [stderr]    Compiling pcc v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error: linking with `cc` failed: exit status: 1
[INFO] [stdout]   |
[INFO] [stdout]   = note: LC_ALL="C" PATH="/opt/rustwide/rustup-home/toolchains/1.77.0-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/bin:/opt/rustwide/cargo-home/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin" VSLANG="1033" "cc" "-m64" "/tmp/rustcuO3lSh/symbols.o" "/opt/rustwide/target/debug/deps/pcc-87596dfda6a1205c.pcc.705fc8dda38ead09-cgu.0.rcgu.o" "/opt/rustwide/target/debug/deps/pcc-87596dfda6a1205c.pcc.705fc8dda38ead09-cgu.1.rcgu.o" "/opt/rustwide/target/debug/deps/pcc-87596dfda6a1205c.pcc.705fc8dda38ead09-cgu.2.rcgu.o" "/opt/rustwide/target/debug/deps/pcc-87596dfda6a1205c.pcc.705fc8dda38ead09-cgu.3.rcgu.o" "/opt/rustwide/target/debug/deps/pcc-87596dfda6a1205c.pcc.705fc8dda38ead09-cgu.4.rcgu.o" "/opt/rustwide/target/debug/deps/pcc-87596dfda6a1205c.pcc.705fc8dda38ead09-cgu.5.rcgu.o" "/opt/rustwide/target/debug/deps/pcc-87596dfda6a1205c.pcc.705fc8dda38ead09-cgu.6.rcgu.o" "/opt/rustwide/target/debug/deps/pcc-87596dfda6a1205c.pcc.705fc8dda38ead09-cgu.7.rcgu.o" "/opt/rustwide/target/debug/deps/pcc-87596dfda6a1205c.2oppti1v1vmt5a61.rcgu.o" "-Wl,--as-needed" "-L" "/opt/rustwide/target/debug/deps" "-L" "/opt/rustwide/rustup-home/toolchains/1.77.0-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib" "-Wl,-Bstatic" "/opt/rustwide/rustup-home/toolchains/1.77.0-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/libtest-300eeeab3fc50492.rlib" "/opt/rustwide/rustup-home/toolchains/1.77.0-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/libgetopts-3b61adbfa5f479cb.rlib" "/opt/rustwide/rustup-home/toolchains/1.77.0-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/libunicode_width-25a2c6ed3a15969a.rlib" "/opt/rustwide/rustup-home/toolchains/1.77.0-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/librustc_std_workspace_std-03c6df379885f78e.rlib" "/opt/rustwide/target/debug/deps/libclap-e59d4c0b6c3f05ad.rlib" "/opt/rustwide/target/debug/deps/libstrsim-002d54b067a867e1.rlib" "/opt/rustwide/target/debug/deps/libatty-d06424b3c4cc2499.rlib" "/opt/rustwide/target/debug/deps/liblibc-fee5dd092e29711e.rlib" "/opt/rustwide/target/debug/deps/libtextwrap-3ac14449e669c46e.rlib" "/opt/rustwide/target/debug/deps/libvec_map-0826e30cd5ac3e91.rlib" "/opt/rustwide/target/debug/deps/libos_str_bytes-2393a5e8d2c54348.rlib" "/opt/rustwide/target/debug/deps/libtermcolor-eb1a9dbebea6f43b.rlib" "/opt/rustwide/target/debug/deps/libunicode_width-e894a2426bdd0694.rlib" "/opt/rustwide/target/debug/deps/libindexmap-fef7fba69bb69c6c.rlib" "/opt/rustwide/target/debug/deps/libhashbrown-ed742e74f781658c.rlib" "/opt/rustwide/target/debug/deps/libbitflags-f223d469458bfa8a.rlib" "/opt/rustwide/target/debug/deps/libregex-c82181158a912b56.rlib" "/opt/rustwide/target/debug/deps/libthread_local-178663188a15c6c8.rlib" "/opt/rustwide/target/debug/deps/liblazy_static-d8ef76936e73bd76.rlib" "/opt/rustwide/target/debug/deps/libregex_syntax-4a53bb7acc152ca1.rlib" "/opt/rustwide/target/debug/deps/libaho_corasick-ef1bf13aab587a86.rlib" "/opt/rustwide/target/debug/deps/libmemchr-39917af228c08787.rlib" "/opt/rustwide/rustup-home/toolchains/1.77.0-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/libstd-320ebc7037fb8f95.rlib" "/opt/rustwide/rustup-home/toolchains/1.77.0-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/libpanic_unwind-5c5363659220970d.rlib" "/opt/rustwide/rustup-home/toolchains/1.77.0-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/libobject-bec15aa2c4312c4c.rlib" "/opt/rustwide/rustup-home/toolchains/1.77.0-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/libmemchr-fe71d6e60bf77974.rlib" "/opt/rustwide/rustup-home/toolchains/1.77.0-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/libaddr2line-0f5608a77595bf7e.rlib" "/opt/rustwide/rustup-home/toolchains/1.77.0-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/libgimli-b8b7c25fe3bad107.rlib" "/opt/rustwide/rustup-home/toolchains/1.77.0-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/librustc_demangle-0f75b33b546e9dfc.rlib" "/opt/rustwide/rustup-home/toolchains/1.77.0-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/libstd_detect-2c2d79a7fce0ec84.rlib" "/opt/rustwide/rustup-home/toolchains/1.77.0-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/libhashbrown-d29140320fecac62.rlib" "/opt/rustwide/rustup-home/toolchains/1.77.0-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/librustc_std_workspace_alloc-9274a8eb44eefdb5.rlib" "/opt/rustwide/rustup-home/toolchains/1.77.0-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/libminiz_oxide-4c1e8c7ac02fe45d.rlib" "/opt/rustwide/rustup-home/toolchains/1.77.0-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/libadler-0f62d6b334d8a8b9.rlib" "/opt/rustwide/rustup-home/toolchains/1.77.0-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/libunwind-56f5161b8051bb71.rlib" "/opt/rustwide/rustup-home/toolchains/1.77.0-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/libcfg_if-659f33ab33d4b7a0.rlib" "/opt/rustwide/rustup-home/toolchains/1.77.0-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/liblibc-194ca45e594e82cf.rlib" "/opt/rustwide/rustup-home/toolchains/1.77.0-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/liballoc-8de8e7171366ad5b.rlib" "/opt/rustwide/rustup-home/toolchains/1.77.0-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/librustc_std_workspace_core-dd54ac19f2116694.rlib" "/opt/rustwide/rustup-home/toolchains/1.77.0-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/libcore-7466f872aeeff38e.rlib" "/opt/rustwide/rustup-home/toolchains/1.77.0-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/libcompiler_builtins-9886ca42a5954174.rlib" "-Wl,-Bdynamic" "-lgcc_s" "-lutil" "-lrt" "-lpthread" "-lm" "-ldl" "-lc" "-Wl,--eh-frame-hdr" "-Wl,-z,noexecstack" "-L" "/opt/rustwide/rustup-home/toolchains/1.77.0-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib" "-o" "/opt/rustwide/target/debug/deps/pcc-87596dfda6a1205c" "-Wl,--gc-sections" "-pie" "-Wl,-z,relro,-z,now" "-nodefaultlibs"
[INFO] [stdout]   = note: /usr/bin/ld: final link failed: No space left on device
[INFO] [stdout]           collect2: error: ld returned 1 exit status
[INFO] [stdout]           
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 1 previous error
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `pcc` (bin "pcc" test) due to 2 previous errors
[INFO] running `Command { std: "docker" "inspect" "e4e547f92a257bd8ce34de7bf5d4740986d7afa6c88b89fe0464e029d5817291", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e4e547f92a257bd8ce34de7bf5d4740986d7afa6c88b89fe0464e029d5817291", kill_on_drop: false }`
[INFO] [stdout] e4e547f92a257bd8ce34de7bf5d4740986d7afa6c88b89fe0464e029d5817291
[INFO] testing plavelo/placc against beta-2024-03-24 for beta-1.78-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fplavelo%2Fplacc" "/workspace/builds/worker-2-tc2/source", kill_on_drop: false }`
[INFO] [stderr] fatal: could not create leading directories of '/workspace/builds/worker-2-tc2/source': No space left on device
[INFO] testing plavelo/placc against beta-2024-03-24 for beta-1.78-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fplavelo%2Fplacc" "/workspace/builds/worker-2-tc2/source", kill_on_drop: false }`
[INFO] [stderr] fatal: could not create leading directories of '/workspace/builds/worker-2-tc2/source': No space left on device
[INFO] testing plavelo/placc against beta-2024-03-24 for beta-1.78-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fplavelo%2Fplacc" "/workspace/builds/worker-2-tc2/source", kill_on_drop: false }`
[INFO] [stderr] fatal: could not create leading directories of '/workspace/builds/worker-2-tc2/source': No space left on device
[INFO] testing plavelo/placc against beta-2024-03-24 for beta-1.78-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fplavelo%2Fplacc" "/workspace/builds/worker-2-tc2/source", kill_on_drop: false }`
[INFO] [stderr] fatal: could not create leading directories of '/workspace/builds/worker-2-tc2/source': No space left on device
[INFO] testing plavelo/placc against beta-2024-03-24 for beta-1.78-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fplavelo%2Fplacc" "/workspace/builds/worker-2-tc2/source", kill_on_drop: false }`
[INFO] [stderr] fatal: could not create leading directories of '/workspace/builds/worker-2-tc2/source': No space left on device
[ERROR] this task or one of its parent failed!
[ERROR] failed to checkout https://github.com/plavelo/placc
[ERROR] caused by: command failed: exit status: 128
[ERROR] note: run with `RUST_BACKTRACE=1` to display a backtrace.