SIGSEV on stable (1.74.0)

[TTDRosen]

When running the rust compiler under the qemu-system-riscv64 emulator I get a SIGSEV crash. This same crash can also be seen on real riscv hardware when running ubuntu-23.10.

Code

The crash seems to happen before code has compiled so any program will cause a similar crash.

fn main() {}

Meta

This happened on every version of rust that I tried

rustc 1.74.0 (79e9716c9 2023-11-13)
binary: rustc
commit-hash: 79e9716c980570bfd1f666e3b16ac583f0168962
commit-date: 2023-11-13
host: riscv64gc-unknown-linux-gnu
release: 1.74.0
LLVM version: 17.0.4

Error output

error: rustc interrupted by SIGSEGV, printing backtrace

/home/ubuntu/.rustup/toolchains/stable-riscv64gc-unknown-linux-gnu/bin/../lib/librustc_driver-32688bc33ce513ef.so(+0xbcb99a)[0x7fff9f9cb99a]
linux-vdso.so.1(__vdso_rt_sigreturn+0x0)[0x7fffa7313800]
/lib/riscv64-linux-gnu/libc.so.6(read+0x44)[0x7fff9ebeaece]
/home/ubuntu/.rustup/toolchains/stable-riscv64gc-unknown-linux-gnu/bin/../lib/libstd-3fecb5e5a54e748b.so(_ZN3std3sys4unix2fs4File4read17h96a5ba4bb0c3f6c1E+0x26)[0x7fff9ed41058]
/home/ubuntu/.rustup/toolchains/stable-riscv64gc-unknown-linux-gnu/bin/../lib/librustc_driver-32688bc33ce513ef.so(+0x532e27a)[0x7fffa412e27a]
/home/ubuntu/.rustup/toolchains/stable-riscv64gc-unknown-linux-gnu/bin/../lib/librustc_driver-32688bc33ce513ef.so(+0x532d268)[0x7fffa412d268]
/home/ubuntu/.rustup/toolchains/stable-riscv64gc-unknown-linux-gnu/bin/../lib/librustc_driver-32688bc33ce513ef.so(+0x532f06e)[0x7fffa412f06e]
/home/ubuntu/.rustup/toolchains/stable-riscv64gc-unknown-linux-gnu/bin/../lib/librustc_driver-32688bc33ce513ef.so(+0x532f0c2)[0x7fffa412f0c2]
/home/ubuntu/.rustup/toolchains/stable-riscv64gc-unknown-linux-gnu/bin/../lib/librustc_driver-32688bc33ce513ef.so(+0x532f8fa)[0x7fffa412f8fa]
/home/ubuntu/.rustup/toolchains/stable-riscv64gc-unknown-linux-gnu/bin/../lib/librustc_driver-32688bc33ce513ef.so(+0x533089e)[0x7fffa413089e]
/home/ubuntu/.rustup/toolchains/stable-riscv64gc-unknown-linux-gnu/bin/../lib/libstd-3fecb5e5a54e748b.so(rust_metadata_std_8ca29eab19a61e15+0xaebf0)[0x7fff9ed46bf0]
/lib/riscv64-linux-gnu/libc.so.6(+0x6a956)[0x7fff9eba0956]
/lib/riscv64-linux-gnu/libc.so.6(+0xbbbf0)[0x7fff9ebf1bf0]

[bjorn3]

Can you get a backtrace using gdb? The backtrace printed by the SIGSEGV handler uses frame pointers, which is not all that accurate given that rustc is compiled without frame pointers. And it misses symbols for most frames.

[TTDRosen]

This is the backtrace I got from gdb

Thread 3 "rustc" received signal SIGSEGV, Segmentation fault.
syscall (syscall_number=98, arg1=<optimized out>, arg2=137, arg3=2, arg4=0, arg5=0, arg6=-1, arg7=98) at ../sysdeps/unix/sysv/linux/riscv/syscall.c:27
27	in ../sysdeps/unix/sysv/linux/riscv/syscall.c
(gdb) bt
#0  syscall (syscall_number=98, arg1=<optimized out>, arg2=137, arg3=2, arg4=0, arg5=0, arg6=-1, arg7=98) at ../sysdeps/unix/sysv/linux/riscv/syscall.c:27
#1  0x00007ffff7f1e09e in std::sys::unix::futex::futex_wait () at library/std/src/sys/unix/futex.rs:62
#2  std::sys::unix::locks::futex_condvar::Condvar::wait_optional_timeout () at library/std/src/sys/unix/locks/futex_condvar.rs:49
#3  std::sys::unix::locks::futex_condvar::Condvar::wait () at library/std/src/sys/unix/locks/futex_condvar.rs:33
#4  0x00007ffff4d2d230 in <jobserver::HelperState>::for_each_request::<jobserver::imp::spawn_helper::{closure#1}::{closure#0}> ()
   from /home/ubuntu/.rustup/toolchains/stable-riscv64gc-unknown-linux-gnu/bin/../lib/librustc_driver-32688bc33ce513ef.so
#5  0x00007ffff4d2f06e in std::sys_common::backtrace::__rust_begin_short_backtrace::<jobserver::imp::spawn_helper::{closure#1}, ()> ()
   from /home/ubuntu/.rustup/toolchains/stable-riscv64gc-unknown-linux-gnu/bin/../lib/librustc_driver-32688bc33ce513ef.so
#6  0x00007ffff4d2f0c2 in std::panicking::try::do_call::<core::panic::unwind_safe::AssertUnwindSafe<<std::thread::Builder>::spawn_unchecked_<jobserver::imp::spawn_helper::{closure#1}, ()>::{closure#1}::{closure#0}>, ()> () from /home/ubuntu/.rustup/toolchains/stable-riscv64gc-unknown-linux-gnu/bin/../lib/librustc_driver-32688bc33ce513ef.so
#7  0x00007ffff4d2f8fa in __rust_try.llvm.14045574179110023769 () from /home/ubuntu/.rustup/toolchains/stable-riscv64gc-unknown-linux-gnu/bin/../lib/librustc_driver-32688bc33ce513ef.so
#8  0x00007ffff4d3089e in <<std::thread::Builder>::spawn_unchecked_<jobserver::imp::spawn_helper::{closure#1}, ()>::{closure#1} as core::ops::function::FnOnce<()>>::call_once::{shim:vtable#0} () from /home/ubuntu/.rustup/toolchains/stable-riscv64gc-unknown-linux-gnu/bin/../lib/librustc_driver-32688bc33ce513ef.so
#9  0x00007ffff7f1cbf0 in alloc::boxed::{impl#47}::call_once<(), dyn core::ops::function::FnOnce<(), Output=()>, alloc::alloc::Global> () at library/alloc/src/boxed.rs:2007
#10 alloc::boxed::{impl#47}::call_once<(), alloc::boxed::Box<dyn core::ops::function::FnOnce<(), Output=()>, alloc::alloc::Global>, alloc::alloc::Global> ()
    at library/alloc/src/boxed.rs:2007
#11 std::sys::unix::thread::{impl#2}::new::thread_start () at library/std/src/sys/unix/thread.rs:108
#12 0x00007fffef908956 in start_thread (arg=<optimized out>) at ./nptl/pthread_create.c:444
#13 0x00007fffef959bf0 in __thread_start_clone3 () at ../sysdeps/unix/sysv/linux/riscv/clone3.S:71

[TTDRosen]

For a bit more context, I ran under strace and the last output was futex(0x7fff77e23d10, FUTEX_WAIT_BITSET|FUTEX_CLOCK_REALTIME, 16924, NULL, FUTEX_BITSET_MATCH_ANYerror: rustc interrupted by SIGSEGV, printing backtrace

[saethlin]

This looks like a duplicate of #117022

[apiraino]

yes, very likely. I'm also confident enough this is a duplicate so closing. Feel free to reopen if it's not the case.

@TTDRosen do you have a chance to test against another Ubuntu RISCV distribution (see comment)?

[TTDRosen]

Yes, reverting to an older Ubuntu install seems to have solved the problem.

Thanks for the help.