Re: rustc from trixie-backports crashes compiling compiler-builtins

Hey Rust maintainers,

could you please take a look?

Thanks,
Micha

Am 28. Januar 2026 16:02:49 MEZ schrieb Matthew Gabeler-Lee <[email protected]>:
>I'm trying to build https://github.com/microsoft/edit using the bpo
>version of cargo & rustc, and running into a compiler crash:
>
>Repro:
>1. Install rustc, rust-src, and cargo from trixie-backports
>(1.90.0+dfsg1-1~bpo13+2)
>2. Clone https://github.com/microsoft/edit
>3. Build with: RUSTC_BOOTSTRAP=1 cargo build --config
>.cargo/release.toml --release
>4. rustc crashes with SIGSEGV
>
>The top of the backtrace is:
>error: rustc interrupted by SIGSEGV, printing backtrace
>
>/lib/x86_64-linux-gnu/librustc_driver-1986f22fdc122ac9.so(+0x960ba5)
>[0x7fe9f0960ba5]
>/lib/x86_64-linux-gnu/libc.so.6(+0x3fdf0) [0x7fe9efe4adf0]
>/lib/x86_64-linux-gnu/libLLVM.so.19.1(+0x23b294a) [0x7fe9ea3b294a]
>/lib/x86_64-linux-gnu/libLLVM.so.19.1(_ZN4llvm16ConstantFoldCallEPKNS_8CallBaseEPNS_8FunctionENS_8ArrayRefIPNS_8ConstantEEEPKNS_17TargetLibraryInfoEb+0x13c)
>[0x7fe9ea3af6ec]
>
>The full crash output is here:
>https://gist.github.com/fastcat/b41a69b0c171e9a8dacec9b6b5a48837
>
>If I use the rust:1.90.0-trixie docker image to do the build, it
>doesn't crash. Similarly if I use rustc 1.90.1 from a forky docker
>container, it also doesn't crash. This seems to point to it being
>something haywire with the BPO build, or perhaps with its
>dependencies?
>
>If there's a way to get symbols for rustc & llvm to get a better
>backtrace, or other things I can do to get more/better diagnostics,
>I'm all ears.
>
>Please CC me on replies.
>
>Thanks,
>  -- Matt
>