[INFO] fetching crate rftrace 0.3.2...
[INFO] testing rftrace-0.3.2 against beta-2026-04-21 for beta-1.96-2
[INFO] extracting crate rftrace 0.3.2 into /workspace/builds/worker-6-tc2/source
[INFO] started tweaking crates.io crate rftrace 0.3.2
[INFO] finished tweaking crates.io crate rftrace 0.3.2
[INFO] tweaked toml for crates.io crate rftrace 0.3.2 written to /workspace/builds/worker-6-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate rftrace 0.3.2 on toolchain beta-2026-04-21
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+beta-2026-04-21" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate crates.io crate rftrace 0.3.2 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" "+beta-2026-04-21" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc2/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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2026-04-21" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 443c24f13f864a3762130215db9d422667a29819776d0178612a1e1e1a857b68
[INFO] running `Command { std: "docker" "start" "-a" "443c24f13f864a3762130215db9d422667a29819776d0178612a1e1e1a857b68", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "443c24f13f864a3762130215db9d422667a29819776d0178612a1e1e1a857b68", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "443c24f13f864a3762130215db9d422667a29819776d0178612a1e1e1a857b68", kill_on_drop: false }`
[INFO] [stdout] 443c24f13f864a3762130215db9d422667a29819776d0178612a1e1e1a857b68
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc2/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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2026-04-21" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] e698e410b993347beea4a3f4e5825caa7cef34844cdeab237d511d0e0e0d7834
[INFO] running `Command { std: "docker" "start" "-a" "e698e410b993347beea4a3f4e5825caa7cef34844cdeab237d511d0e0e0d7834", kill_on_drop: false }`
[INFO] [stderr]    Compiling cc v1.2.32
[INFO] [stderr]    Compiling home v0.5.11
[INFO] [stderr]    Compiling llvm-tools v0.1.1
[INFO] [stderr]    Compiling rftrace v0.3.2 (/opt/rustwide/workdir)
[INFO] [stderr] error: failed to run custom build command for `rftrace v0.3.2 (/opt/rustwide/workdir)`
[INFO] [stderr] note: To improve backtraces for build dependencies, set the CARGO_PROFILE_DEV_BUILD_OVERRIDE_DEBUG=true environment variable to enable debug information generation.
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `/opt/rustwide/target/debug/build/rftrace-7cece5c616cc124a/build-script-build` (exit status: 101)
[INFO] [stderr]   --- stdout
[INFO] [stderr]   Building Backend!
[INFO] [stderr]   cargo::rerun-if-changed=src/thread_local.c
[INFO] [stderr]   OUT_DIR = Some(/opt/rustwide/target/debug/build/rftrace-05d684822bcde3b2/out)
[INFO] [stderr]   OPT_LEVEL = Some(0)
[INFO] [stderr]   TARGET = Some(x86_64-unknown-linux-gnu)
[INFO] [stderr]   HOST = Some(x86_64-unknown-linux-gnu)
[INFO] [stderr]   cargo:rerun-if-env-changed=CC_x86_64-unknown-linux-gnu
[INFO] [stderr]   CC_x86_64-unknown-linux-gnu = None
[INFO] [stderr]   cargo:rerun-if-env-changed=CC_x86_64_unknown_linux_gnu
[INFO] [stderr]   CC_x86_64_unknown_linux_gnu = None
[INFO] [stderr]   cargo:rerun-if-env-changed=HOST_CC
[INFO] [stderr]   HOST_CC = None
[INFO] [stderr]   cargo:rerun-if-env-changed=CC
[INFO] [stderr]   CC = None
[INFO] [stderr]   cargo:rerun-if-env-changed=CC_ENABLE_DEBUG_OUTPUT
[INFO] [stderr]   RUSTC_WRAPPER = None
[INFO] [stderr]   cargo:rerun-if-env-changed=CRATE_CC_NO_DEFAULTS
[INFO] [stderr]   CRATE_CC_NO_DEFAULTS = None
[INFO] [stderr]   DEBUG = Some(true)
[INFO] [stderr]   CARGO_CFG_TARGET_FEATURE = Some(fxsr,sse,sse2)
[INFO] [stderr]   cargo:rerun-if-env-changed=CFLAGS
[INFO] [stderr]   CFLAGS = None
[INFO] [stderr]   cargo:rerun-if-env-changed=HOST_CFLAGS
[INFO] [stderr]   HOST_CFLAGS = None
[INFO] [stderr]   cargo:rerun-if-env-changed=CFLAGS_x86_64_unknown_linux_gnu
[INFO] [stderr]   CFLAGS_x86_64_unknown_linux_gnu = None
[INFO] [stderr]   cargo:rerun-if-env-changed=CFLAGS_x86_64-unknown-linux-gnu
[INFO] [stderr]   CFLAGS_x86_64-unknown-linux-gnu = None
[INFO] [stderr]   CARGO_ENCODED_RUSTFLAGS = Some(--cap-lints=warn)
[INFO] [stderr]   cargo:rerun-if-env-changed=AR_x86_64-unknown-linux-gnu
[INFO] [stderr]   AR_x86_64-unknown-linux-gnu = None
[INFO] [stderr]   cargo:rerun-if-env-changed=AR_x86_64_unknown_linux_gnu
[INFO] [stderr]   AR_x86_64_unknown_linux_gnu = None
[INFO] [stderr]   cargo:rerun-if-env-changed=HOST_AR
[INFO] [stderr]   HOST_AR = None
[INFO] [stderr]   cargo:rerun-if-env-changed=AR
[INFO] [stderr]   AR = None
[INFO] [stderr]   cargo:rerun-if-env-changed=ARFLAGS
[INFO] [stderr]   ARFLAGS = None
[INFO] [stderr]   cargo:rerun-if-env-changed=HOST_ARFLAGS
[INFO] [stderr]   HOST_ARFLAGS = None
[INFO] [stderr]   cargo:rerun-if-env-changed=ARFLAGS_x86_64_unknown_linux_gnu
[INFO] [stderr]   ARFLAGS_x86_64_unknown_linux_gnu = None
[INFO] [stderr]   cargo:rerun-if-env-changed=ARFLAGS_x86_64-unknown-linux-gnu
[INFO] [stderr]   ARFLAGS_x86_64-unknown-linux-gnu = None
[INFO] [stderr]   cargo:rustc-link-lib=static=thread_local
[INFO] [stderr]   cargo:rustc-link-search=native=/opt/rustwide/target/debug/build/rftrace-05d684822bcde3b2/out
[INFO] [stderr]   Starting sub-cargo
[INFO] [stderr] 
[INFO] [stderr]   --- stderr
[INFO] [stderr]      Compiling shlex v1.3.0
[INFO] [stderr]      Compiling home v0.5.11
[INFO] [stderr]      Compiling llvm-tools v0.1.1
[INFO] [stderr]      Compiling cc v1.2.32
[INFO] [stderr]      Compiling rftrace v0.3.2 (/opt/rustwide/workdir)
[INFO] [stderr]   error[E0463]: can't find crate for `core`
[INFO] [stderr]     |
[INFO] [stderr]     = note: the `x86_64-unknown-none` target may not be installed
[INFO] [stderr]     = help: consider downloading the target with `rustup target add x86_64-unknown-none`
[INFO] [stderr] 
[INFO] [stderr]   For more information about this error, try `rustc --explain E0463`.
[INFO] [stderr]   error: could not compile `rftrace` (lib) due to 1 previous error
[INFO] [stderr] 
[INFO] [stderr]   thread 'main' (77) panicked at build.rs:68:5:
[INFO] [stderr]   Unable to build tracer's static lib!
[INFO] [stderr]   stack backtrace:
[INFO] [stderr]      0:     0x5ffbb0c3659a - std[128c3efe2914e152]::backtrace_rs::backtrace::libunwind::trace
[INFO] [stderr]                                  at /rustc/8489f1adbe1c8f8921cf18b9962cf565237a5489/library/std/src/../../backtrace/src/backtrace/libunwind.rs:117:9
[INFO] [stderr]      1:     0x5ffbb0c3659a - std[128c3efe2914e152]::backtrace_rs::backtrace::trace_unsynchronized::<std[128c3efe2914e152]::sys::backtrace::_print_fmt::{closure#1}>
[INFO] [stderr]                                  at /rustc/8489f1adbe1c8f8921cf18b9962cf565237a5489/library/std/src/../../backtrace/src/backtrace/mod.rs:66:14
[INFO] [stderr]      2:     0x5ffbb0c3659a - std[128c3efe2914e152]::sys::backtrace::_print_fmt
[INFO] [stderr]                                  at /rustc/8489f1adbe1c8f8921cf18b9962cf565237a5489/library/std/src/sys/backtrace.rs:74:9
[INFO] [stderr]      3:     0x5ffbb0c3659a - <<std[128c3efe2914e152]::sys::backtrace::BacktraceLock>::print::DisplayBacktrace as core[6771d259883166e6]::fmt::Display>::fmt
[INFO] [stderr]                                  at /rustc/8489f1adbe1c8f8921cf18b9962cf565237a5489/library/std/src/sys/backtrace.rs:44:26
[INFO] [stderr]      4:     0x5ffbb0c4ac7a - <core[6771d259883166e6]::fmt::rt::Argument>::fmt
[INFO] [stderr]                                  at /rustc/8489f1adbe1c8f8921cf18b9962cf565237a5489/library/core/src/fmt/rt.rs:152:76
[INFO] [stderr]      5:     0x5ffbb0c4ac7a - core[6771d259883166e6]::fmt::write
[INFO] [stderr]      6:     0x5ffbb0c3c562 - std[128c3efe2914e152]::io::default_write_fmt::<std[128c3efe2914e152]::sys::stdio::unix::Stderr>
[INFO] [stderr]                                  at /rustc/8489f1adbe1c8f8921cf18b9962cf565237a5489/library/std/src/io/mod.rs:621:11
[INFO] [stderr]      7:     0x5ffbb0c3c562 - <std[128c3efe2914e152]::sys::stdio::unix::Stderr as std[128c3efe2914e152]::io::Write>::write_fmt
[INFO] [stderr]                                  at /rustc/8489f1adbe1c8f8921cf18b9962cf565237a5489/library/std/src/io/mod.rs:1976:13
[INFO] [stderr]      8:     0x5ffbb0c1676f - <std[128c3efe2914e152]::sys::backtrace::BacktraceLock>::print
[INFO] [stderr]                                  at /rustc/8489f1adbe1c8f8921cf18b9962cf565237a5489/library/std/src/sys/backtrace.rs:47:9
[INFO] [stderr]      9:     0x5ffbb0c1676f - std[128c3efe2914e152]::panicking::default_hook::{closure#0}
[INFO] [stderr]                                  at /rustc/8489f1adbe1c8f8921cf18b9962cf565237a5489/library/std/src/panicking.rs:292:27
[INFO] [stderr]     10:     0x5ffbb0c30671 - std[128c3efe2914e152]::panicking::default_hook
[INFO] [stderr]                                  at /rustc/8489f1adbe1c8f8921cf18b9962cf565237a5489/library/std/src/panicking.rs:319:9
[INFO] [stderr]     11:     0x5ffbb0c3082b - std[128c3efe2914e152]::panicking::panic_with_hook
[INFO] [stderr]                                  at /rustc/8489f1adbe1c8f8921cf18b9962cf565237a5489/library/std/src/panicking.rs:825:13
[INFO] [stderr]     12:     0x5ffbb0c15d1c - std[128c3efe2914e152]::panicking::begin_panic::<&str>::{closure#0}
[INFO] [stderr]                                  at /rustc/8489f1adbe1c8f8921cf18b9962cf565237a5489/library/std/src/panicking.rs:762:9
[INFO] [stderr]     13:     0x5ffbb0c0b899 - std[128c3efe2914e152]::sys::backtrace::__rust_end_short_backtrace::<std[128c3efe2914e152]::panicking::begin_panic<&str>::{closure#0}, !>
[INFO] [stderr]                                  at /rustc/8489f1adbe1c8f8921cf18b9962cf565237a5489/library/std/src/sys/backtrace.rs:182:18
[INFO] [stderr]     14:     0x5ffbb0c08d80 - std[128c3efe2914e152]::panicking::begin_panic::<&str>
[INFO] [stderr]                                  at /rustc/8489f1adbe1c8f8921cf18b9962cf565237a5489/library/std/src/panicking.rs:761:5
[INFO] [stderr]     15:     0x5ffbb0b848da - build_script_build::build_backend::hc0ae824010eb1e1f
[INFO] [stderr]     16:     0x5ffbb0b85e81 - build_script_build::main::h11b82483c1466c5b
[INFO] [stderr]     17:     0x5ffbb0b87573 - core::ops::function::FnOnce::call_once::hc5668b49e4522b1b
[INFO] [stderr]     18:     0x5ffbb0b894b6 - std::sys::backtrace::__rust_begin_short_backtrace::h5e355191b1393291
[INFO] [stderr]     19:     0x5ffbb0b89499 - std::rt::lang_start::{{closure}}::h718b000892230a09
[INFO] [stderr]     20:     0x5ffbb0c2f424 - <&dyn core[6771d259883166e6]::ops::function::Fn<(), Output = i32> + core[6771d259883166e6]::marker::Sync + core[6771d259883166e6]::panic::unwind_safe::RefUnwindSafe as core[6771d259883166e6]::ops::function::FnOnce<()>>::call_once
[INFO] [stderr]                                  at /rustc/8489f1adbe1c8f8921cf18b9962cf565237a5489/library/core/src/ops/function.rs:287:21
[INFO] [stderr]     21:     0x5ffbb0c2f424 - std[128c3efe2914e152]::panicking::catch_unwind::do_call::<&dyn core[6771d259883166e6]::ops::function::Fn<(), Output = i32> + core[6771d259883166e6]::marker::Sync + core[6771d259883166e6]::panic::unwind_safe::RefUnwindSafe, i32>
[INFO] [stderr]                                  at /rustc/8489f1adbe1c8f8921cf18b9962cf565237a5489/library/std/src/panicking.rs:581:40
[INFO] [stderr]     22:     0x5ffbb0c2f424 - std[128c3efe2914e152]::panicking::catch_unwind::<i32, &dyn core[6771d259883166e6]::ops::function::Fn<(), Output = i32> + core[6771d259883166e6]::marker::Sync + core[6771d259883166e6]::panic::unwind_safe::RefUnwindSafe>
[INFO] [stderr]                                  at /rustc/8489f1adbe1c8f8921cf18b9962cf565237a5489/library/std/src/panicking.rs:544:19
[INFO] [stderr]     23:     0x5ffbb0c2f424 - std[128c3efe2914e152]::panic::catch_unwind::<&dyn core[6771d259883166e6]::ops::function::Fn<(), Output = i32> + core[6771d259883166e6]::marker::Sync + core[6771d259883166e6]::panic::unwind_safe::RefUnwindSafe, i32>
[INFO] [stderr]                                  at /rustc/8489f1adbe1c8f8921cf18b9962cf565237a5489/library/std/src/panic.rs:359:14
[INFO] [stderr]     24:     0x5ffbb0c2f424 - std[128c3efe2914e152]::rt::lang_start_internal::{closure#0}
[INFO] [stderr]                                  at /rustc/8489f1adbe1c8f8921cf18b9962cf565237a5489/library/std/src/rt.rs:175:24
[INFO] [stderr]     25:     0x5ffbb0c2f424 - std[128c3efe2914e152]::panicking::catch_unwind::do_call::<std[128c3efe2914e152]::rt::lang_start_internal::{closure#0}, isize>
[INFO] [stderr]                                  at /rustc/8489f1adbe1c8f8921cf18b9962cf565237a5489/library/std/src/panicking.rs:581:40
[INFO] [stderr]     26:     0x5ffbb0c2f424 - std[128c3efe2914e152]::panicking::catch_unwind::<isize, std[128c3efe2914e152]::rt::lang_start_internal::{closure#0}>
[INFO] [stderr]                                  at /rustc/8489f1adbe1c8f8921cf18b9962cf565237a5489/library/std/src/panicking.rs:544:19
[INFO] [stderr]     27:     0x5ffbb0c2f424 - std[128c3efe2914e152]::panic::catch_unwind::<std[128c3efe2914e152]::rt::lang_start_internal::{closure#0}, isize>
[INFO] [stderr]                                  at /rustc/8489f1adbe1c8f8921cf18b9962cf565237a5489/library/std/src/panic.rs:359:14
[INFO] [stderr]     28:     0x5ffbb0c2f424 - std[128c3efe2914e152]::rt::lang_start_internal
[INFO] [stderr]                                  at /rustc/8489f1adbe1c8f8921cf18b9962cf565237a5489/library/std/src/rt.rs:171:5
[INFO] [stderr]     29:     0x5ffbb0b89481 - std::rt::lang_start::ha5b56bf7f00033b2
[INFO] [stderr]     30:     0x5ffbb0b88d05 - main
[INFO] [stderr]     31:     0x7dbf8a15e1ca - <unknown>
[INFO] [stderr]     32:     0x7dbf8a15e28b - __libc_start_main
[INFO] [stderr]     33:     0x5ffbb0b81df5 - _start
[INFO] [stderr]     34:                0x0 - <unknown>
[INFO] running `Command { std: "docker" "inspect" "e698e410b993347beea4a3f4e5825caa7cef34844cdeab237d511d0e0e0d7834", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e698e410b993347beea4a3f4e5825caa7cef34844cdeab237d511d0e0e0d7834", kill_on_drop: false }`
[INFO] [stdout] e698e410b993347beea4a3f4e5825caa7cef34844cdeab237d511d0e0e0d7834
