[SOLVED] SIGSEGV when trying to build minimal program for attiny85

help
1

Hello!

Absolute rust newbie here. I'm trying to compile an absolutely minimal program for an attiny85 micro controller. No development board, just a plain attiny85.
Unfortunately, I'll get a SIGSEGV in rustc-std-workspace-core when trying to compile. Those are the details:

± rustup show
Default host: x86_64-unknown-linux-gnu
rustup home:  /home/markus/.rustup

installed toolchains
--------------------

stable-x86_64-unknown-linux-gnu (default)
nightly-x86_64-unknown-linux-gnu

active toolchain
----------------

nightly-x86_64-unknown-linux-gnu (directory override for '/home/markus/tmp/rust-playground/avr01')
rustc 1.69.0-nightly (0416b1a6f 2023-02-14)

Cargo.toml:

[package]
name = "avr01"
version = "0.1.0"
edition = "2021"

# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html

[dependencies]

[profile.dev]
panic = "abort"

[profile.release]
panic = "abort"

[dependencies.attiny-hal]
git = "https://github.com/rahix/avr-hal"
version = "*"
features = ["attiny85"]

main.rs:

#![no_std]
#![no_main]

#[no_mangle]
pub extern fn main() {
}

#[panic_handler]
fn my_panic(_info: &core::panic::PanicInfo) -> ! {
    loop {}
}

I'm using the spec from avr-hal.

This is what happens:

± cargo build -Z build-std=core --target avr-attiny85.json 
    Blocking waiting for file lock on build directory
   Compiling compiler_builtins v0.1.87
   Compiling core v0.0.0 (/home/markus/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/core)
   Compiling proc-macro2 v1.0.51
   Compiling unicode-ident v1.0.6
   Compiling quote v1.0.23
   Compiling syn v1.0.107
   Compiling rustversion v1.0.11
   Compiling proc-macro-hack v0.5.20+deprecated
   Compiling paste v1.0.11
   Compiling avr-hal-generic v0.1.0 (https://github.com/rahix/avr-hal#4c9c44c3)
   Compiling ufmt-macros v0.2.0
   Compiling rustc-std-workspace-core v1.99.0 (/home/markus/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/rustc-std-workspace-core)
/home/markus/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/librustc_driver-0402d84ba5f47f34.so(+0x32c5e63)[0x14b8af8c5e63]
/lib/x86_64-linux-gnu/libc.so.6(+0x3bf90)[0x14b8ac45af90]
/home/markus/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/libLLVM-15-rust-1.69.0-nightly.so(_ZN4llvm12MachineInstr10addOperandERNS_15MachineFunctionERKNS_14MachineOperandE+0x1e6)[0x14b8aaa00542]
/home/markus/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/libLLVM-15-rust-1.69.0-nightly.so(+0x4c7d58c)[0x14b8aa27d58c]
/home/markus/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/libLLVM-15-rust-1.69.0-nightly.so(+0x4c7d2df)[0x14b8aa27d2df]
/home/markus/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/libLLVM-15-rust-1.69.0-nightly.so(_ZN4llvm13FPPassManager13runOnFunctionERNS_8FunctionE+0xafd)[0x14b8aac4acd9]
/home/markus/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/libLLVM-15-rust-1.69.0-nightly.so(_ZN4llvm13FPPassManager11runOnModuleERNS_6ModuleE+0x2f)[0x14b8aac4a1bb]
/home/markus/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/libLLVM-15-rust-1.69.0-nightly.so(_ZN4llvm6legacy15PassManagerImpl3runERNS_6ModuleE+0x21a)[0x14b8aad544a0]
/home/markus/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/librustc_driver-0402d84ba5f47f34.so(+0x27bc892)[0x14b8aedbc892]
/home/markus/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/librustc_driver-0402d84ba5f47f34.so(+0x27bc2aa)[0x14b8aedbc2aa]
/home/markus/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/librustc_driver-0402d84ba5f47f34.so(+0x27ba4c5)[0x14b8aedba4c5]
/home/markus/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/librustc_driver-0402d84ba5f47f34.so(+0x27b767d)[0x14b8aedb767d]
/home/markus/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/librustc_driver-0402d84ba5f47f34.so(+0x27b65ff)[0x14b8aedb65ff]
/home/markus/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/librustc_driver-0402d84ba5f47f34.so(+0x27b55e0)[0x14b8aedb55e0]
/home/markus/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/librustc_driver-0402d84ba5f47f34.so(+0x26eff26)[0x14b8aeceff26]
/home/markus/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/libstd-67e0fe4bfa018a5e.so(rust_metadata_std_c4719229b53c8129+0x10ed23)[0x14b8b0b98d23]
/lib/x86_64-linux-gnu/libc.so.6(+0x88fd4)[0x14b8ac4a7fd4]
/lib/x86_64-linux-gnu/libc.so.6(+0x10966c)[0x14b8ac52866c]
   Compiling nb v1.0.0
   Compiling nb v0.1.3
   Compiling ufmt-write v0.1.0
   Compiling bare-metal v1.0.0
   Compiling vcell v0.1.3
   Compiling cfg-if v1.0.0
   Compiling void v1.0.2
   Compiling embedded-hal v0.2.7
   Compiling avr-device v0.5.0
   Compiling ufmt v0.1.2
error: could not compile `core`

Caused by:
  process didn't exit successfully: `rustc --crate-name core --edition=2021 /home/markus/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/core/src/lib.rs --error-format=json --json=diagnostic-rendered-ansi,artifacts,future-incompat --diagnostic-width=225 --crate-type lib --emit=dep-info,metadata,link -C panic=abort -C embed-bitcode=no -C debuginfo=2 -C metadata=d0c1272c4f5cdc4e -C extra-filename=-d0c1272c4f5cdc4e --out-dir /home/markus/tmp/rust-playground/avr01/target/avr-attiny85/debug/deps --target /home/markus/tmp/rust-playground/avr01/avr-attiny85.json -Z force-unstable-if-unmarked -L dependency=/home/markus/tmp/rust-playground/avr01/target/avr-attiny85/debug/deps -L dependency=/home/markus/tmp/rust-playground/avr01/target/debug/deps --cap-lints allow` (signal: 11, SIGSEGV: invalid memory reference)
warning: build failed, waiting for other jobs to finish...

Since this happens when building rust core, I as an absolute beginner am a bit puzzled...

(Note that I'm only rust beginner. I have 30 years of programming experience, several years in the embedded world. Now an old dog wants to learn new tricks :slight_smile: )

It would be absolutely awesome if you could help me.
Thanks,

The Grue.

2

[AVR] compiler segfaults · Issue #107261 · rust-lang/rust · GitHub seems related.

3

Good news: after rustup update nightly today (i.e. rustc 1.69.0-nightly (4507fdaaa 2023-02-18) , this error is gone.
Now I have this error (no changes in the minimal code that I have described above):

± cargo clean
[:~/tmp/rust-playground/avr01] master* ± cargo build -Z build-std=core --target avr-attiny85.json 
   Compiling compiler_builtins v0.1.87
   Compiling core v0.0.0 (/home/markus/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/core)
   Compiling proc-macro2 v1.0.51
   Compiling quote v1.0.23
   Compiling unicode-ident v1.0.6
   Compiling proc-macro-hack v0.5.20+deprecated
   Compiling syn v1.0.107
   Compiling rustversion v1.0.11
   Compiling paste v1.0.11
   Compiling avr-hal-generic v0.1.0 (https://github.com/rahix/avr-hal#4c9c44c3)
   Compiling ufmt-macros v0.2.0
   Compiling rustc-std-workspace-core v1.99.0 (/home/markus/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/rustc-std-workspace-core)
error: ran out of registers during register allocation

error: could not compile `core` due to previous error

And it seems very much related to this "solved" issue:

Sigh…

Since they asked for it, I opened another ticket:

4

I have a working build now. The steps to fix it come from the github issue. I had to:

  • Add this to Cargo.toml
[profile.release]
lto = true
  • Make a release build:
cargo build -Z build-std=core --target avr-attiny85.json --release
5

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