Skip to content

rust program that allocates a large temporary segfaults on MacOS #107814

Closed
Closed
rust program that allocates a large temporary segfaults on MacOS#107814
Labels
A-stack-probeArea: Stack probing and guard pagesC-bugCategory: This is a bug.O-AArch64Armv8-A or later processors in AArch64 mode

Description

@squell
squell
opened on Feb 8, 2023

While playing around with rustc 1.69.0-nightly (bd39bbb 2023-02-07) on MacOS, I ran into the following:

//const N: usize = 2_088_032; // largest size that works without abort
const N: usize = 2_092_349; // first segfault 

fn main () {
    let _ = Box::new([0; N]);
}

With N <= 2088032 this program works fine; above that the binary that rustc makes produces a runtime abort. Both are acceptable outcomes.

But with N >= 2092349 running the program results in a segmentation fault instead. It sounds like something has destroyed something that the stack unwinder relies on?

Meta

rustc --version --verbose:

rustc 1.69.0-nightly (bd39bbb4b 2023-02-07)
binary: rustc
commit-hash: bd39bbb4bb92df439bf6d85470e296cc6a47ffbd
commit-date: 2023-02-07
host: aarch64-apple-darwin
release: 1.69.0-nightly
LLVM version: 15.0.7
Backtrace 

n/a (the compiled program segfaults)

Activity

  1. squell
    added
    C-bugCategory: This is a bug.
    on Feb 8, 2023
  2. workingjubilee
    added
    O-AArch64Armv8-A or later processors in AArch64 mode
    A-stack-probeArea: Stack probing and guard pages
    on Feb 9, 2023

  3. workingjubilee commented on Feb 9, 2023

    @workingjubilee
    workingjubilee
    on Feb 9, 2023
    Member

    I believe this is a consequence of not properly probing the stack due to the lack of support for it on aarch64.

  4. luqmana commented on Sep 19, 2024

    @luqmana
    luqmana
    on Sep 19, 2024
    Contributor

    Looks like this has since been resolved (#118491 enabled inline stack probes for aarch64).

    $ rustc +1.68-aarch64-apple-darwin crash.rs
$ ./crash
[1]    57080 segmentation fault  ./crash

$  rustc +nightly -vV
rustc 1.83.0-nightly (f79a912d9 2024-09-18)
binary: rustc
commit-hash: f79a912d9edc3ad4db910c0e93672ed5c65133fa
commit-date: 2024-09-18
host: aarch64-apple-darwin
release: 1.83.0-nightly
LLVM version: 19.1.0

$ rustc +nightly crash.rs
$ ./crash

thread 'main' has overflowed its stack
fatal runtime error: stack overflow
[1]    57097 abort      ./crash
  5. saethlin
    closed this as completedon Sep 19, 2024
Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment

Metadata

Metadata

Assignees

No one assigned

    Labels

    A-stack-probeArea: Stack probing and guard pagesC-bugCategory: This is a bug.O-AArch64Armv8-A or later processors in AArch64 mode

    Type

    No type

    Projects

    No projects

      Milestone

      No milestone

      Relationships

      None yet

      Development

      No branches or pull requests

      Issue actions