[AVR] compiler segfaults #107261
Labels
A-LLVM
Area: Code generation parts specific to LLVM. Both correctness bugs and optimization-related issues.
I-crash
Issue: The compiler crashes (SIGSEGV, SIGABRT, etc). Use I-ICE instead when the compiler panics.
llvm-fixed-upstream
Issue expected to be fixed by the next major LLVM upgrade, or backported fixes
O-AVR
Target: AVR processors (ATtiny, ATmega, etc.)
T-compiler
Relevant to the compiler team, which will review and decide on the PR/issue.
Comments
gergoerdi
added a commit
to gergoerdi/llvm-issue-107261
that referenced
this issue
Jan 24, 2023
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I tried making the reproducer as small as possible, but at some point it becomes extremely sensitive to seemingly trivial changes: for example, if I remove the unused |
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Tried it with latest nightly, crashes just the same: |
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Can you try getting a backtrace where the segfault occurs by running the rustc command in a debugger? |
Noratrieb
added
the
I-crash
Sure. BTW, is your question implying that you didn't manage to reproduce this with what I've provided so far? Do let me know if I'm missing some inputs that are relevant. |
Noratrieb
added
the
A-LLVM
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Just noting that this still reproduces even with avr-progmem 0.3.3, the latest fixes in rustc for AVR and |
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Hmm. Isn't it also a bug in itself if |
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Oh, probably. |
Noratrieb
added
the
T-compiler
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fwiw, on the newest llvm-project (with debug assertions enabled), this itself: #![no_std]
#![no_main]
extern crate avr_std_stub;
use core::{hint::black_box, panic::PanicInfo};
fn reverse_bits(mut x: u8) -> u8 {
let mut y: u8 = 0;
let mut i = 7;
while i > 0 {
if x & 0x01 != 0 {
y |= 0x80;
}
y = y.rotate_left(1);
x >>= 1;
i -= 1;
}
y
}
#[no_mangle]
pub extern "C" fn main() {
let x = black_box(123);
let x = reverse_bits(x);
let x = black_box(x);
loop {
//
}
}... fails with: Curiously, it works with 16-bit+ types; I'll see if there's anything I can do. Edit: minimized: |
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Okie, patch submitted: With that patch, compiling your application, @gergoerdi, seems to pass; I'll let know once the patch is merged and applied to rustc 🙂 |
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Status: fixed on LLVM's side - will be solved when LLVM's version is bumped here (apparently soon ™️ ). |
workingjubilee
added
the
llvm-fixed-upstream
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fwiw, this got fixed with #114048 🙂 |
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On this linked repository, running
cargo build --releasefails with a segmentation fault:The text was updated successfully, but these errors were encountered: