The newly updated version "0.2.13" cannot run on mipsel about getrandom HOT 7 CLOSED

This is almost certainly caused by #396

That PR removed certain fallback code on certain Linux CPU architectures (all CPU architectures that aren't ARM, x86, PowerPC, or s390). On such architectures (like mipsel), a sufficiently new kernel is already required. Looking at the list of Rust Targets the mipsel-unknown-linux-gnu target requires kernel 4.4, which should have support for the getrandom syscall.

@lbl8603 to help us debug further:

• which Rust target are you using (is it mipsel-unknown-linux-gnu)?
• which Rust version are you using?
• which Linux distro are you using?
• which version of the linux kernel are you running on?

from getrandom.

CC @newpavlov @briansmith (who worked on #396)

from getrandom.

• target: mipsel-unknown-linux-musl
• Rust version: rustc 1.71.1 (eb26296b5 2023-08-03)
• linux:
  Linux RM2100 3.4.113 #2 SMP Sat Mar 19 17:12:12 CST 2022 mips GNU/Linux
Linux version 3.4.113 (root@hiboy-VirtualBox) (gcc version 4.4.7 (GCC) ) #2 SMP Sat Mar 19 17:12:12 CST 2022

from getrandom.

Looking at the platform list, it seems like the musl targets don't list a minimum kernel version (they just require MUSL 1.2.3 which requires kernel 2.6 or later), while for mipsel-unknown-linux-gnu the minim kernel version is 4.4. I'm wondering if we should reach out to see what the actual minimum supported kernel version for Rust is on -musl targets.

@lbl8603 out of curiosity what system/distro are you running on? Based on the uname it looks like some sort of old router?

@newpavlov @briansmith should we support MUSL systems with kernels older than 3.17?

from getrandom.

Hm, mipsel-unknown-linux-gnu requires kernel 4.4, so we assumed that mipsel-unknown-linux-musl would require it as well. Could you please find an official link that Rust officially supports pre-4.4 kernels for this target?

Adding a MUSL exception looks like an obvious solution for now.

from getrandom.

Hm, mipsel-unknown-linux-gnu requires kernel 4.4, so we assumed that mipsel-unknown-linux-musl would require it as well. Could you please find an official link that Rust officially supports pre-4.4 kernels for this target?

I'm wondering if MUSL might target an older kernel version. It seems like a lot of the folks who target very old kernels intentionally use MUSL to avoid depending on an ancient glibc.

EDIT: Looking at rust-lang/compiler-team#493 it seems like the only reason Linux 3.2 is even required by rust is to support GLIBC (whose newer versions have that as the minimum kernel version).

from getrandom.

Compiling target mipsel-unknown-linux-musl requires using versions prior to Rust 1.71.1. I encountered this bug on the router

from getrandom.