Caused by:
[ 1035s]   process didn't exit successfully: `/home/abuild/rpmbuild/BUILD/rustc-1.27.0-src/build/bootstrap/debug/rustc --crate-name core libcore/lib.rs --error-format json --crate-type lib --emit=dep-info,link -C opt-level=3 -C metadata=7495aa529631b37d -C extra-filename=-7495aa529631b37d --out-dir /home/abuild/rpmbuild/BUILD/rustc-1.27.0-src/build/i686-unknown-linux-gnu/stage1-std/i686-unknown-linux-gnu/release/deps --target i686-unknown-linux-gnu -L dependency=/home/abuild/rpmbuild/BUILD/rustc-1.27.0-src/build/i686-unknown-linux-gnu/stage1-std/i686-unknown-linux-gnu/release/deps -L dependency=/home/abuild/rpmbuild/BUILD/rustc-1.27.0-src/build/i686-unknown-linux-gnu/stage1-std/release/deps -Clink-arg=-Wl,-z,relro,-z,now` (signal: 7, SIGBUS: access to undefined memory)