Illegal instruction on stable-x86_64-unknown-linux-gnu #5160

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1. methbkts

   added

   bug

   on Oct 21, 2026
2. ChrisDenton commented on Oct 24, 2026

   

   ChrisDenton

   on Oct 24, 2026

   Last edited by ChrisDenton

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   I'm not aware of any changes on our end that could have caused this.

   This could possibly be an issue in rustc (though I somewhat doubt it) since one difference is that rustup was built with a newer rustc. More likely it's something that changed when building one of the C dependencies we use (e.g. a cryptography library).
3. shoPanda commented on Oct 24, 2026

   

   shoPanda

   on Oct 24, 2026

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   I believe this is the issue: RustCrypto/stream-ciphers#579

   Running on CPU with SSE2 but without SSE4.1:

   Thread 1 "rustup-init" received signal SIGILL, Illegal instruction.
   
   #0  0x0000555555ca3638 in core::core_arch::x86::sse41::_mm_extract_epi32::<1> ()
   #1  0x0000555555ca3626 in <chacha20::ChaChaCore<chacha20::R12, chacha20::variants::Legacy> as rand_core::block::Generator>::generate ()
   #2  0x0000555555ca26c9 in rustup::utils::raw::random_string ()
   #3  0x0000555555ca4428 in <rustup::dist::temp::Context>::new_file_with_ext ()
   #4  0x0000555555886f8c in <rustup::dist::download::DownloadCfg>::download_and_check::{closure#0} ()
   #5  0x0000555555886356 in <rustup::dist::download::DownloadCfg>::dl_v2_manifest::{closure#0} ()
   #6  0x000055555589b759 in rustup::dist::try_update_from_dist_::{closure#0} ()
   #7  0x000055555585ab30 in <rustup::dist::DistOptions>::install_into::{closure#0}::{closure#0} ()
   #8  0x0000555555854cd7 in <rustup::install::InstallMethod>::install::{closure#0}::{closure#0} ()
   #9  0x0000555555885484 in <rustup::install::InstallMethod>::install::{closure#0} ()
   #10 0x000055555585657c in <rustup::toolchain::distributable::DistributableToolchain>::install::{closure#0}::{closure#0} ()
   #11 0x000055555588b80e in <rustup::toolchain::distributable::DistributableToolchain>::install::{closure#0} ()
   #12 0x000055555585f7c6 in rustup::cli::setup_mode::main::{closure#0}::{closure#0} ()
   #13 0x0000555555852075 in rustup_init::run_rustup_inner::{closure#0}::{closure#0} ()
   #14 0x00005555558504e4 in rustup_init::run_rustup::{closure#0}::{closure#0} ()
   #15 0x00005555558848a7 in rustup_init::main::{closure#0} ()
   #16 0x000055555581a94d in <tokio::runtime::runtime::Runtime>::block_on::<rustup_init::main::{closure#0}> ()
   #17 0x00005555558bc9a2 in rustup_init::main ()
   #18 0x000055555583ef3b in std::sys::backtrace::__rust_begin_short_backtrace::<fn() -> core::result::Result<std::process::ExitCode, anyhow::Error>, core::result::Result<std::process::ExitCode, anyhow::Error>> ()
   #19 0x00005555558e5f70 in main ()
   

   Updating chacha20 from v0.10.1 (yanked) to v0.10.2 fixes the issue.

   👍React with 👍3Reacted by Chris Denton, rami3l and Metin Bektas
4. ChrisDenton commented on Oct 24, 2026

   

   ChrisDenton

   on Oct 24, 2026

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   Thanks! We'll need to do another release then.
5. rami3l commented on Oct 25, 2026

   

   rami3l

   on Oct 25, 2026

   Last edited by rami3l

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   Closed by #5162, thanks a lot @ChrisDenton! I'll handle the release when I get back later this week.

   See #5166 for the release status.
6. rami3l

   closed this as completedon Oct 25, 2026