[INFO] cloning repository https://github.com/PureW/Photo-analyzer
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/PureW/Photo-analyzer" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FPureW%2FPhoto-analyzer", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FPureW%2FPhoto-analyzer'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] f401e8a7f9365e1130c56c1b92ff2358a73f9588
[INFO] testing PureW/Photo-analyzer against beta-2022-02-22 for beta-1.60-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FPureW%2FPhoto-analyzer" "/workspace/builds/worker-7/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-7/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/PureW/Photo-analyzer on toolchain beta-2022-02-22
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2022-02-22" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/PureW/Photo-analyzer
[INFO] finished tweaking git repo https://github.com/PureW/Photo-analyzer
[INFO] tweaked toml for git repo https://github.com/PureW/Photo-analyzer written to /workspace/builds/worker-7/source/Cargo.toml
[INFO] crate git repo https://github.com/PureW/Photo-analyzer already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2022-02-22" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating git repository `https://github.com/LaurentMazare/tch-rs.git`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded ndarray v0.13.1
[INFO] [stderr]   Downloaded flate2 v1.0.16
[INFO] [stderr]   Downloaded bzip2-sys v0.1.9+1.0.8
[INFO] [stderr]   Downloaded podio v0.1.7
[INFO] [stderr]   Downloaded libc v0.2.72
[INFO] [stderr]   Downloaded curl v0.4.30
[INFO] [stderr]   Downloaded zip v0.5.6
[INFO] [stderr]   Downloaded curl-sys v0.4.32+curl-7.70.0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/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@sha256:0cd99ca24d8e8c98e67c542213511d985b8778b5bdcbb160e038429496686047" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2022-02-22" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 35ad7270a563b83eba777da3751f9ed40bbad6f46442bd933f8d573dcb109ff0
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "35ad7270a563b83eba777da3751f9ed40bbad6f46442bd933f8d573dcb109ff0", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "35ad7270a563b83eba777da3751f9ed40bbad6f46442bd933f8d573dcb109ff0", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "35ad7270a563b83eba777da3751f9ed40bbad6f46442bd933f8d573dcb109ff0", kill_on_drop: false }`
[INFO] [stdout] 35ad7270a563b83eba777da3751f9ed40bbad6f46442bd933f8d573dcb109ff0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/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" "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@sha256:0cd99ca24d8e8c98e67c542213511d985b8778b5bdcbb160e038429496686047" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2022-02-22" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] be25bd0a3d1276bed9d686e4f7c5422f12544060730358e8cf723b10643f7b6d
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "be25bd0a3d1276bed9d686e4f7c5422f12544060730358e8cf723b10643f7b6d", kill_on_drop: false }`
[INFO] [stderr]    Compiling syn v1.0.33
[INFO] [stderr]    Compiling gimli v0.22.0
[INFO] [stderr]    Compiling object v0.20.0
[INFO] [stderr]    Compiling curl v0.4.30
[INFO] [stderr]    Compiling podio v0.1.7
[INFO] [stderr]    Compiling ndarray v0.13.1
[INFO] [stderr]    Compiling openssl-sys v0.9.58
[INFO] [stderr]    Compiling libz-sys v1.0.25
[INFO] [stderr]    Compiling bzip2-sys v0.1.9+1.0.8
[INFO] [stderr]    Compiling miniz_oxide v0.4.0
[INFO] [stderr]    Compiling curl-sys v0.4.32+curl-7.70.0
[INFO] [stderr]    Compiling num-complex v0.2.4
[INFO] [stderr]    Compiling clap v2.33.1
[INFO] [stderr]    Compiling flate2 v1.0.16
[INFO] [stderr]    Compiling bzip2 v0.3.3
[INFO] [stderr]    Compiling zip v0.5.6
[INFO] [stderr]    Compiling addr2line v0.13.0
[INFO] [stderr]    Compiling backtrace v0.3.50
[INFO] [stderr]    Compiling synstructure v0.12.4
[INFO] [stderr]    Compiling syn-mid v0.5.0
[INFO] [stderr]    Compiling failure_derive v0.1.8
[INFO] [stderr]    Compiling proc-macro-error-attr v1.0.3
[INFO] [stderr]    Compiling thiserror-impl v1.0.20
[INFO] [stderr]    Compiling proc-macro-error v1.0.3
[INFO] [stderr]    Compiling failure v0.1.8
[INFO] [stderr]    Compiling structopt-derive v0.4.8
[INFO] [stderr]    Compiling thiserror v1.0.20
[INFO] [stderr]    Compiling torch-sys v0.1.7 (https://github.com/LaurentMazare/tch-rs.git?rev=be6f8a5a831fdd7f43b1c7df9a933d2da5cdf9c2#be6f8a5a)
[INFO] [stderr]    Compiling structopt v0.3.15
[INFO] [stderr] error: failed to run custom build command for `torch-sys v0.1.7 (https://github.com/LaurentMazare/tch-rs.git?rev=be6f8a5a831fdd7f43b1c7df9a933d2da5cdf9c2#be6f8a5a)`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `/opt/rustwide/target/debug/build/torch-sys-a43c3616c6c2ccc2/build-script-build` (exit status: 101)
[INFO] [stderr]   --- stdout
[INFO] [stderr]   cargo:rerun-if-env-changed=TORCH_CUDA_VERSION
[INFO] [stderr]   cargo:rerun-if-env-changed=LIBTORCH
[INFO] [stderr] 
[INFO] [stderr]   --- stderr
[INFO] [stderr]   thread 'main' panicked at 'called `Result::unwrap()` on an `Err` value: Error { description: "Couldn't resolve host name", code: 6, extra: None }
[INFO] [stderr] 
[INFO] [stderr]      0: failure::backtrace::internal::InternalBacktrace::new
[INFO] [stderr]                at /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/failure-0.1.8/src/backtrace/internal.rs:46
[INFO] [stderr]      1: failure::backtrace::Backtrace::new
[INFO] [stderr]                at /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/failure-0.1.8/src/backtrace/mod.rs:121
[INFO] [stderr]      2: <failure::error::error_impl::ErrorImpl as core::convert::From<F>>::from
[INFO] [stderr]                at /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/failure-0.1.8/src/error/error_impl.rs:19
[INFO] [stderr]      3: <failure::error::Error as core::convert::From<F>>::from
[INFO] [stderr]                at /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/failure-0.1.8/src/error/mod.rs:36
[INFO] [stderr]      4: <core::result::Result<T,F> as core::ops::try_trait::FromResidual<core::result::Result<core::convert::Infallible,E>>>::from_residual
[INFO] [stderr]                at /rustc/0a4f984a87c7ba6c74ec3e78442fec955a419e32/library/core/src/result.rs:2064
[INFO] [stderr]      5: build_script_build::download
[INFO] [stderr]                at build.rs:30
[INFO] [stderr]      6: build_script_build::prepare_libtorch_dir
[INFO] [stderr]                at build.rs:122
[INFO] [stderr]      7: build_script_build::main
[INFO] [stderr]                at build.rs:194
[INFO] [stderr]      8: core::ops::function::FnOnce::call_once
[INFO] [stderr]                at /rustc/0a4f984a87c7ba6c74ec3e78442fec955a419e32/library/core/src/ops/function.rs:227
[INFO] [stderr]      9: std::sys_common::backtrace::__rust_begin_short_backtrace
[INFO] [stderr]                at /rustc/0a4f984a87c7ba6c74ec3e78442fec955a419e32/library/std/src/sys_common/backtrace.rs:122
[INFO] [stderr]     10: std::rt::lang_start::{{closure}}
[INFO] [stderr]                at /rustc/0a4f984a87c7ba6c74ec3e78442fec955a419e32/library/std/src/rt.rs:145
[INFO] [stderr]     11: core::ops::function::impls::<impl core::ops::function::FnOnce<A> for &F>::call_once
[INFO] [stderr]                at /rustc/0a4f984a87c7ba6c74ec3e78442fec955a419e32/library/core/src/ops/function.rs:259
[INFO] [stderr]         std::panicking::try::do_call
[INFO] [stderr]                at /rustc/0a4f984a87c7ba6c74ec3e78442fec955a419e32/library/std/src/panicking.rs:492
[INFO] [stderr]         std::panicking::try
[INFO] [stderr]                at /rustc/0a4f984a87c7ba6c74ec3e78442fec955a419e32/library/std/src/panicking.rs:456
[INFO] [stderr]         std::panic::catch_unwind
[INFO] [stderr]                at /rustc/0a4f984a87c7ba6c74ec3e78442fec955a419e32/library/std/src/panic.rs:137
[INFO] [stderr]         std::rt::lang_start_internal::{{closure}}
[INFO] [stderr]                at /rustc/0a4f984a87c7ba6c74ec3e78442fec955a419e32/library/std/src/rt.rs:128
[INFO] [stderr]         std::panicking::try::do_call
[INFO] [stderr]                at /rustc/0a4f984a87c7ba6c74ec3e78442fec955a419e32/library/std/src/panicking.rs:492
[INFO] [stderr]         std::panicking::try
[INFO] [stderr]                at /rustc/0a4f984a87c7ba6c74ec3e78442fec955a419e32/library/std/src/panicking.rs:456
[INFO] [stderr]         std::panic::catch_unwind
[INFO] [stderr]                at /rustc/0a4f984a87c7ba6c74ec3e78442fec955a419e32/library/std/src/panic.rs:137
[INFO] [stderr]         std::rt::lang_start_internal
[INFO] [stderr]                at /rustc/0a4f984a87c7ba6c74ec3e78442fec955a419e32/library/std/src/rt.rs:128
[INFO] [stderr]     12: std::rt::lang_start
[INFO] [stderr]                at /rustc/0a4f984a87c7ba6c74ec3e78442fec955a419e32/library/std/src/rt.rs:144
[INFO] [stderr]     13: main
[INFO] [stderr]     14: __libc_start_main
[INFO] [stderr]     15: _start
[INFO] [stderr]   ', /opt/rustwide/cargo-home/git/checkouts/tch-rs-b9d1710db79374bb/be6f8a5/torch-sys/build.rs:122:48
[INFO] [stderr]   stack backtrace:
[INFO] [stderr]      0:     0x564e8fd8619c - std::backtrace_rs::backtrace::libunwind::trace::h02555d7ca8aa068a
[INFO] [stderr]                                  at /rustc/0a4f984a87c7ba6c74ec3e78442fec955a419e32/library/std/src/../../backtrace/src/backtrace/libunwind.rs:93:5
[INFO] [stderr]      1:     0x564e8fd8619c - std::backtrace_rs::backtrace::trace_unsynchronized::h8555a46024147da8
[INFO] [stderr]                                  at /rustc/0a4f984a87c7ba6c74ec3e78442fec955a419e32/library/std/src/../../backtrace/src/backtrace/mod.rs:66:5
[INFO] [stderr]      2:     0x564e8fd8619c - std::sys_common::backtrace::_print_fmt::h4c7f50b4f105da1e
[INFO] [stderr]                                  at /rustc/0a4f984a87c7ba6c74ec3e78442fec955a419e32/library/std/src/sys_common/backtrace.rs:66:5
[INFO] [stderr]      3:     0x564e8fd8619c - <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt::ha305a40dbc030444
[INFO] [stderr]                                  at /rustc/0a4f984a87c7ba6c74ec3e78442fec955a419e32/library/std/src/sys_common/backtrace.rs:45:22
[INFO] [stderr]      4:     0x564e8fda9e8c - core::fmt::write::hadd15acf4d6ce273
[INFO] [stderr]                                  at /rustc/0a4f984a87c7ba6c74ec3e78442fec955a419e32/library/core/src/fmt/mod.rs:1190:17
[INFO] [stderr]      5:     0x564e8fd81248 - std::io::Write::write_fmt::h0f87f6c0c21ec48a
[INFO] [stderr]                                  at /rustc/0a4f984a87c7ba6c74ec3e78442fec955a419e32/library/std/src/io/mod.rs:1657:15
[INFO] [stderr]      6:     0x564e8fd88467 - std::sys_common::backtrace::_print::h0dd5c0810675bd8c
[INFO] [stderr]                                  at /rustc/0a4f984a87c7ba6c74ec3e78442fec955a419e32/library/std/src/sys_common/backtrace.rs:48:5
[INFO] [stderr]      7:     0x564e8fd88467 - std::sys_common::backtrace::print::h20a2155fa0a22ca6
[INFO] [stderr]                                  at /rustc/0a4f984a87c7ba6c74ec3e78442fec955a419e32/library/std/src/sys_common/backtrace.rs:35:9
[INFO] [stderr]      8:     0x564e8fd88467 - std::panicking::default_hook::{{closure}}::habb3b6f3ccdfe00a
[INFO] [stderr]                                  at /rustc/0a4f984a87c7ba6c74ec3e78442fec955a419e32/library/std/src/panicking.rs:295:22
[INFO] [stderr]      9:     0x564e8fd8812f - std::panicking::default_hook::h1c5cf4d5063a38e4
[INFO] [stderr]                                  at /rustc/0a4f984a87c7ba6c74ec3e78442fec955a419e32/library/std/src/panicking.rs:314:9
[INFO] [stderr]     10:     0x564e8fd88bba - std::panicking::rust_panic_with_hook::hb5de7a3072d2cf59
[INFO] [stderr]                                  at /rustc/0a4f984a87c7ba6c74ec3e78442fec955a419e32/library/std/src/panicking.rs:698:17
[INFO] [stderr]     11:     0x564e8fd888a7 - std::panicking::begin_panic_handler::{{closure}}::h5106de2f55f1a411
[INFO] [stderr]                                  at /rustc/0a4f984a87c7ba6c74ec3e78442fec955a419e32/library/std/src/panicking.rs:588:13
[INFO] [stderr]     12:     0x564e8fd86664 - std::sys_common::backtrace::__rust_end_short_backtrace::h5ad5c2a8a003ca72
[INFO] [stderr]                                  at /rustc/0a4f984a87c7ba6c74ec3e78442fec955a419e32/library/std/src/sys_common/backtrace.rs:138:18
[INFO] [stderr]     13:     0x564e8fd885b9 - rust_begin_unwind
[INFO] [stderr]                                  at /rustc/0a4f984a87c7ba6c74ec3e78442fec955a419e32/library/std/src/panicking.rs:584:5
[INFO] [stderr]     14:     0x564e8fb95973 - core::panicking::panic_fmt::hfb4b8460cd493e74
[INFO] [stderr]                                  at /rustc/0a4f984a87c7ba6c74ec3e78442fec955a419e32/library/core/src/panicking.rs:143:14
[INFO] [stderr]     15:     0x564e8fb95a03 - core::result::unwrap_failed::hf9b34e307f812de0
[INFO] [stderr]                                  at /rustc/0a4f984a87c7ba6c74ec3e78442fec955a419e32/library/core/src/result.rs:1749:5
[INFO] [stderr]     16:     0x564e8fba5c88 - core::result::Result<T,E>::unwrap::hbb6e69e5e7a5efd9
[INFO] [stderr]                                  at /rustc/0a4f984a87c7ba6c74ec3e78442fec955a419e32/library/core/src/result.rs:1065:23
[INFO] [stderr]     17:     0x564e8fb9a751 - build_script_build::prepare_libtorch_dir::h4f913f63c0611856
[INFO] [stderr]                                  at /opt/rustwide/cargo-home/git/checkouts/tch-rs-b9d1710db79374bb/be6f8a5/torch-sys/build.rs:122:13
[INFO] [stderr]     18:     0x564e8fb9b864 - build_script_build::main::hd15fbe0b5348021f
[INFO] [stderr]                                  at /opt/rustwide/cargo-home/git/checkouts/tch-rs-b9d1710db79374bb/be6f8a5/torch-sys/build.rs:194:24
[INFO] [stderr]     19:     0x564e8fba875b - core::ops::function::FnOnce::call_once::h564305d48c961368
[INFO] [stderr]                                  at /rustc/0a4f984a87c7ba6c74ec3e78442fec955a419e32/library/core/src/ops/function.rs:227:5
[INFO] [stderr]     20:     0x564e8fb9e3be - std::sys_common::backtrace::__rust_begin_short_backtrace::hd347dda22418264e
[INFO] [stderr]                                  at /rustc/0a4f984a87c7ba6c74ec3e78442fec955a419e32/library/std/src/sys_common/backtrace.rs:122:18
[INFO] [stderr]     21:     0x564e8fb9cb41 - std::rt::lang_start::{{closure}}::hb1347d4d301e6064
[INFO] [stderr]                                  at /rustc/0a4f984a87c7ba6c74ec3e78442fec955a419e32/library/std/src/rt.rs:145:18
[INFO] [stderr]     22:     0x564e8fd85881 - core::ops::function::impls::<impl core::ops::function::FnOnce<A> for &F>::call_once::h9e134bb161d17658
[INFO] [stderr]                                  at /rustc/0a4f984a87c7ba6c74ec3e78442fec955a419e32/library/core/src/ops/function.rs:259:13
[INFO] [stderr]     23:     0x564e8fd85881 - std::panicking::try::do_call::h7f361d911648db1a
[INFO] [stderr]                                  at /rustc/0a4f984a87c7ba6c74ec3e78442fec955a419e32/library/std/src/panicking.rs:492:40
[INFO] [stderr]     24:     0x564e8fd85881 - std::panicking::try::hbe441b12f8ff00e7
[INFO] [stderr]                                  at /rustc/0a4f984a87c7ba6c74ec3e78442fec955a419e32/library/std/src/panicking.rs:456:19
[INFO] [stderr]     25:     0x564e8fd85881 - std::panic::catch_unwind::h12066b7ab56d7459
[INFO] [stderr]                                  at /rustc/0a4f984a87c7ba6c74ec3e78442fec955a419e32/library/std/src/panic.rs:137:14
[INFO] [stderr]     26:     0x564e8fd85881 - std::rt::lang_start_internal::{{closure}}::h901c86e61467dcde
[INFO] [stderr]                                  at /rustc/0a4f984a87c7ba6c74ec3e78442fec955a419e32/library/std/src/rt.rs:128:48
[INFO] [stderr]     27:     0x564e8fd85881 - std::panicking::try::do_call::h1817b5f028d90a8c
[INFO] [stderr]                                  at /rustc/0a4f984a87c7ba6c74ec3e78442fec955a419e32/library/std/src/panicking.rs:492:40
[INFO] [stderr]     28:     0x564e8fd85881 - std::panicking::try::hd5afeaf2f0454960
[INFO] [stderr]                                  at /rustc/0a4f984a87c7ba6c74ec3e78442fec955a419e32/library/std/src/panicking.rs:456:19
[INFO] [stderr]     29:     0x564e8fd85881 - std::panic::catch_unwind::h13348562ae6426ca
[INFO] [stderr]                                  at /rustc/0a4f984a87c7ba6c74ec3e78442fec955a419e32/library/std/src/panic.rs:137:14
[INFO] [stderr]     30:     0x564e8fd85881 - std::rt::lang_start_internal::hf194c7db73fedcb2
[INFO] [stderr]                                  at /rustc/0a4f984a87c7ba6c74ec3e78442fec955a419e32/library/std/src/rt.rs:128:20
[INFO] [stderr]     31:     0x564e8fb9cb10 - std::rt::lang_start::h3866409cab129e85
[INFO] [stderr]                                  at /rustc/0a4f984a87c7ba6c74ec3e78442fec955a419e32/library/std/src/rt.rs:144:17
[INFO] [stderr]     32:     0x564e8fb9c00c - main
[INFO] [stderr]     33:     0x7f4b6c7d80b3 - __libc_start_main
[INFO] [stderr]     34:     0x564e8fb9615e - _start
[INFO] [stderr]     35:                0x0 - <unknown>
[INFO] running `Command { std: "docker" "inspect" "be25bd0a3d1276bed9d686e4f7c5422f12544060730358e8cf723b10643f7b6d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "be25bd0a3d1276bed9d686e4f7c5422f12544060730358e8cf723b10643f7b6d", kill_on_drop: false }`
[INFO] [stdout] be25bd0a3d1276bed9d686e4f7c5422f12544060730358e8cf723b10643f7b6d