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zsalke opened this issue Apr 16, 2025 · 2 comments
Open

doing some concurrency homework and got a compile-time panic, reporting as requested #139887

zsalke opened this issue Apr 16, 2025 · 2 comments
Labels
C-bug Category: This is a bug. I-ICE Issue: The compiler panicked, giving an Internal Compilation Error (ICE) ❄️ needs-triage This issue may need triage. Remove it if it has been sufficiently triaged. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.

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@zsalke
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zsalke commented Apr 16, 2025

Code

<code>
use std::thread;
use std::sync::{Mutex, Condvar};

fn main() {

    static SIZE: usize = 5;

    let m_vec = Mutex::new(vec![0,0,0,0,0]);
    let m_count = Mutex::new(0);
    let mut consume = 0;
    let mut produce = 0;
    let cv_empty = Condvar::new();
    let cv_full = Condvar::new();


    thread::scope(|t| {
        t.spawn( || {
            //update the numbers in the vector
            for _ in 0..100 {
                let mut count = m_count.lock().unwrap();

                while *count == 5 {
                    count = cv_full.wait(count).unwrap(); 
                }

                m_vec.lock().unwrap()[produce%5]=produce;
                produce+= 1;
                *count+=1;

                cv_empty.notify_one();
            }
        });
        //print the numbers the vector
        t.spawn( || {
            for _ in 0..100 {
               let mut count = m_count.lock().unwrap();
                
                while *count == 0 {
                    count = cv_empty.wait(count).unwrap();
                }

                println!("{}",m_vec.lock().unwrap()[consume%5]);
                consume+=1;
                *count-=1;

                cv_full.notify_one();
            }
        });
    });

}

Meta

rustc --version --verbose:

<version>
rustc 1.80.1 (3f5fd8dd4 2024-08-06)
binary: rustc
commit-hash: 3f5fd8dd41153bc5fdca9427e9e05be2c767ba23
commit-date: 2024-08-06
host: x86_64-unknown-linux-gnu
release: 1.80.1
LLVM version: 18.1.7

Error output

<output>
thread 'coordinator' panicked at /rustc/3f5fd8dd41153bc5fdca9427e9e05be2c767ba23/compiler/rustc_codegen_ssa/src/back/write.rs:1846:6:
failed to spawn work thread: Os { code: 11, kind: WouldBlock, message: "Resource temporarily unavailable" }

[stack backtrace redacted for concision] 

error: the compiler unexpectedly panicked. this is a bug.

query stack during panic:
end of query stack
thread 'rustc' panicked at /rustc/3f5fd8dd41153bc5fdca9427e9e05be2c767ba23/compiler/rustc_codegen_ssa/src/back/write.rs:2052:17:
/rustc/3f5fd8dd41153bc5fdca9427e9e05be2c767ba23/compiler/rustc_codegen_ssa/src/back/write.rs:2052:17: panic during codegen/LLVM phase
Backtrace 

<backtrace>
   0:     0x79eea6301f05 - std::backtrace_rs::backtrace::libunwind::trace::h23054e327d0d4b55
                               at /rustc/3f5fd8dd41153bc5fdca9427e9e05be2c767ba23/library/std/src/../../backtrace/src/backtrace/libunwind.rs:116:5
   1:     0x79eea6301f05 - std::backtrace_rs::backtrace::trace_unsynchronized::h0cc587407d7f7f64
                               at /rustc/3f5fd8dd41153bc5fdca9427e9e05be2c767ba23/library/std/src/../../backtrace/src/backtrace/mod.rs:66:5
   2:     0x79eea6301f05 - std::sys_common::backtrace::_print_fmt::h4feeb59774730d6b
                               at /rustc/3f5fd8dd41153bc5fdca9427e9e05be2c767ba23/library/std/src/sys_common/backtrace.rs:68:5
   3:     0x79eea6301f05 - <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt::hd736fd5964392270
                               at /rustc/3f5fd8dd41153bc5fdca9427e9e05be2c767ba23/library/std/src/sys_common/backtrace.rs:44:22
   4:     0x79eea6352c4b - core::fmt::rt::Argument::fmt::h105051d8ea1ade1e
                               at /rustc/3f5fd8dd41153bc5fdca9427e9e05be2c767ba23/library/core/src/fmt/rt.rs:165:63
   5:     0x79eea6352c4b - core::fmt::write::hc6043626647b98ea
                               at /rustc/3f5fd8dd41153bc5fdca9427e9e05be2c767ba23/library/core/src/fmt/mod.rs:1168:21
   6:     0x79eea62f6bdf - std::io::Write::write_fmt::h0d24b3e0473045db
                               at /rustc/3f5fd8dd41153bc5fdca9427e9e05be2c767ba23/library/std/src/io/mod.rs:1835:15
   7:     0x79eea6301cde - std::sys_common::backtrace::_print::h62df6fc36dcebfc8
                               at /rustc/3f5fd8dd41153bc5fdca9427e9e05be2c767ba23/library/std/src/sys_common/backtrace.rs:47:5
   8:     0x79eea6301cde - std::sys_common::backtrace::print::h45eb8174d25a1e76
                               at /rustc/3f5fd8dd41153bc5fdca9427e9e05be2c767ba23/library/std/src/sys_common/backtrace.rs:34:9
   9:     0x79eea6304719 - std::panicking::default_hook::{{closure}}::haf3f0170eb4f3b53
  10:     0x79eea63044ba - std::panicking::default_hook::hb5d3b27aa9f6dcda
                               at /rustc/3f5fd8dd41153bc5fdca9427e9e05be2c767ba23/library/std/src/panicking.rs:298:9
  11:     0x79eea2c150c1 - std[fba9fafec3bdacf8]::panicking::update_hook::<alloc[a325a9cea6fa5e89]::boxed::Box<rustc_driver_impl[ce01f96e2e949677]::install_ice_hook::{closure#0}>>::{closure#0}
  12:     0x79eea6304e4b - <alloc::boxed::Box<F,A> as core::ops::function::Fn<Args>>::call::h2026a29033a1b9f6
                               at /rustc/3f5fd8dd41153bc5fdca9427e9e05be2c767ba23/library/alloc/src/boxed.rs:2077:9
  13:     0x79eea6304e4b - std::panicking::rust_panic_with_hook::h6b49d59f86ee588c
                               at /rustc/3f5fd8dd41153bc5fdca9427e9e05be2c767ba23/library/std/src/panicking.rs:799:13
  14:     0x79eea6304bc4 - std::panicking::begin_panic_handler::{{closure}}::hd4c2f7ed79b82b70
                               at /rustc/3f5fd8dd41153bc5fdca9427e9e05be2c767ba23/library/std/src/panicking.rs:664:13
  15:     0x79eea63023c9 - std::sys_common::backtrace::__rust_end_short_backtrace::h2946d6d32d7ea1ad
                               at /rustc/3f5fd8dd41153bc5fdca9427e9e05be2c767ba23/library/std/src/sys_common/backtrace.rs:171:18
  16:     0x79eea63048f7 - rust_begin_unwind
                               at /rustc/3f5fd8dd41153bc5fdca9427e9e05be2c767ba23/library/std/src/panicking.rs:652:5
  17:     0x79eea634f1e3 - core::panicking::panic_fmt::ha02418e5cd774672
                               at /rustc/3f5fd8dd41153bc5fdca9427e9e05be2c767ba23/library/core/src/panicking.rs:72:14
  18:     0x79eea634f856 - core::result::unwrap_failed::h55f86ada3ace5ed2
                               at /rustc/3f5fd8dd41153bc5fdca9427e9e05be2c767ba23/library/core/src/result.rs:1679:5
  19:     0x79eea4c3d12f - rustc_codegen_ssa[735fc0e7ecd285d]::back::write::spawn_work::<rustc_codegen_llvm[7d5a1ffcd7eaee82]::LlvmCodegenBackend>
  20:     0x79eea4c3ee0d - rustc_codegen_ssa[735fc0e7ecd285d]::back::write::start_executing_work::<rustc_codegen_llvm[7d5a1ffcd7eaee82]::LlvmCodegenBackend>::{closure#5}
  21:     0x79eea4c3de42 - std[fba9fafec3bdacf8]::sys_common::backtrace::__rust_begin_short_backtrace::<<rustc_codegen_llvm[7d5a1ffcd7eaee82]::LlvmCodegenBackend as rustc_codegen_ssa[735fc0e7ecd285d]::traits::backend::ExtraBackendMethods>::spawn_named_thread<rustc_codegen_ssa[735fc0e7ecd285d]::back::write::start_executing_work<rustc_codegen_llvm[7d5a1ffcd7eaee82]::LlvmCodegenBackend>::{closure#5}, core[1a380081440346cb]::result::Result<rustc_codegen_ssa[735fc0e7ecd285d]::back::write::CompiledModules, ()>>::{closure#0}, core[1a380081440346cb]::result::Result<rustc_codegen_ssa[735fc0e7ecd285d]::back::write::CompiledModules, ()>>
  22:     0x79eea4c3dc81 - <<std[fba9fafec3bdacf8]::thread::Builder>::spawn_unchecked_<<rustc_codegen_llvm[7d5a1ffcd7eaee82]::LlvmCodegenBackend as rustc_codegen_ssa[735fc0e7ecd285d]::traits::backend::ExtraBackendMethods>::spawn_named_thread<rustc_codegen_ssa[735fc0e7ecd285d]::back::write::start_executing_work<rustc_codegen_llvm[7d5a1ffcd7eaee82]::LlvmCodegenBackend>::{closure#5}, core[1a380081440346cb]::result::Result<rustc_codegen_ssa[735fc0e7ecd285d]::back::write::CompiledModules, ()>>::{closure#0}, core[1a380081440346cb]::result::Result<rustc_codegen_ssa[735fc0e7ecd285d]::back::write::CompiledModules, ()>>::{closure#2} as core[1a380081440346cb]::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
  23:     0x79eea630ee3b - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::hdf5fcef8be77a431
                               at /rustc/3f5fd8dd41153bc5fdca9427e9e05be2c767ba23/library/alloc/src/boxed.rs:2063:9
  24:     0x79eea630ee3b - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::h8e8c5ceee46ee198
                               at /rustc/3f5fd8dd41153bc5fdca9427e9e05be2c767ba23/library/alloc/src/boxed.rs:2063:9
  25:     0x79eea630ee3b - std::sys::pal::unix::thread::Thread::new::thread_start::hb85dbfa54ba503d6
                               at /rustc/3f5fd8dd41153bc5fdca9427e9e05be2c767ba23/library/std/src/sys/pal/unix/thread.rs:108:17
  26:     0x79ee9f89caa4 - start_thread
                               at ./nptl/pthread_create.c:447:8
  27:     0x79ee9f929c3c - __GI___clone3
                               at ./misc/../sysdeps/unix/sysv/linux/x86_64/clone3.S:78
  28:                0x0 - <unknown>

<beginning of second panic backtrace>

  0:     0x79eea6301f05 - std::backtrace_rs::backtrace::libunwind::trace::h23054e327d0d4b55
                               at /rustc/3f5fd8dd41153bc5fdca9427e9e05be2c767ba23/library/std/src/../../backtrace/src/backtrace/libunwind.rs:116:5
   1:     0x79eea6301f05 - std::backtrace_rs::backtrace::trace_unsynchronized::h0cc587407d7f7f64
                               at /rustc/3f5fd8dd41153bc5fdca9427e9e05be2c767ba23/library/std/src/../../backtrace/src/backtrace/mod.rs:66:5
   2:     0x79eea6301f05 - std::sys_common::backtrace::_print_fmt::h4feeb59774730d6b
                               at /rustc/3f5fd8dd41153bc5fdca9427e9e05be2c767ba23/library/std/src/sys_common/backtrace.rs:68:5
   3:     0x79eea6301f05 - <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt::hd736fd5964392270
                               at /rustc/3f5fd8dd41153bc5fdca9427e9e05be2c767ba23/library/std/src/sys_common/backtrace.rs:44:22
   4:     0x79eea6352c4b - core::fmt::rt::Argument::fmt::h105051d8ea1ade1e
                               at /rustc/3f5fd8dd41153bc5fdca9427e9e05be2c767ba23/library/core/src/fmt/rt.rs:165:63
   5:     0x79eea6352c4b - core::fmt::write::hc6043626647b98ea
                               at /rustc/3f5fd8dd41153bc5fdca9427e9e05be2c767ba23/library/core/src/fmt/mod.rs:1168:21
   6:     0x79eea62f6bdf - std::io::Write::write_fmt::h0d24b3e0473045db
                               at /rustc/3f5fd8dd41153bc5fdca9427e9e05be2c767ba23/library/std/src/io/mod.rs:1835:15
   7:     0x79eea6301cde - std::sys_common::backtrace::_print::h62df6fc36dcebfc8
                               at /rustc/3f5fd8dd41153bc5fdca9427e9e05be2c767ba23/library/std/src/sys_common/backtrace.rs:47:5
   8:     0x79eea6301cde - std::sys_common::backtrace::print::h45eb8174d25a1e76
                               at /rustc/3f5fd8dd41153bc5fdca9427e9e05be2c767ba23/library/std/src/sys_common/backtrace.rs:34:9
   9:     0x79eea6304719 - std::panicking::default_hook::{{closure}}::haf3f0170eb4f3b53
  10:     0x79eea63044ba - std::panicking::default_hook::hb5d3b27aa9f6dcda
                               at /rustc/3f5fd8dd41153bc5fdca9427e9e05be2c767ba23/library/std/src/panicking.rs:298:9
  11:     0x79eea2c150c1 - std[fba9fafec3bdacf8]::panicking::update_hook::<alloc[a325a9cea6fa5e89]::boxed::Box<rustc_driver_impl[ce01f96e2e949677]::install_ice_hook::{closure#0}>>::{closure#0}
  12:     0x79eea6304e4b - <alloc::boxed::Box<F,A> as core::ops::function::Fn<Args>>::call::h2026a29033a1b9f6
                               at /rustc/3f5fd8dd41153bc5fdca9427e9e05be2c767ba23/library/alloc/src/boxed.rs:2077:9
  13:     0x79eea6304e4b - std::panicking::rust_panic_with_hook::h6b49d59f86ee588c
                               at /rustc/3f5fd8dd41153bc5fdca9427e9e05be2c767ba23/library/std/src/panicking.rs:799:13
  14:     0x79eea30957d5 - std[fba9fafec3bdacf8]::panicking::begin_panic::<alloc[a325a9cea6fa5e89]::string::String>::{closure#0}
  15:     0x79eea3091276 - std[fba9fafec3bdacf8]::sys_common::backtrace::__rust_end_short_backtrace::<std[fba9fafec3bdacf8]::panicking::begin_panic<alloc[a325a9cea6fa5e89]::string::String>::{closure#0}, !>
  16:     0x79eea308d9f1 - std[fba9fafec3bdacf8]::panicking::begin_panic::<alloc[a325a9cea6fa5e89]::string::String>
  17:     0x79eea310e6ed - rustc_middle[ecc07153edf3c281]::util::bug::opt_span_bug_fmt::<rustc_span[4d50fd03223eefaa]::span_encoding::Span>::{closure#0}
  18:     0x79eea30f77ea - rustc_middle[ecc07153edf3c281]::ty::context::tls::with_opt::<rustc_middle[ecc07153edf3c281]::util::bug::opt_span_bug_fmt<rustc_span[4d50fd03223eefaa]::span_encoding::Span>::{closure#0}, !>::{closure#0}
  19:     0x79eea30f766b - rustc_middle[ecc07153edf3c281]::ty::context::tls::with_context_opt::<rustc_middle[ecc07153edf3c281]::ty::context::tls::with_opt<rustc_middle[ecc07153edf3c281]::util::bug::opt_span_bug_fmt<rustc_span[4d50fd03223eefaa]::span_encoding::Span>::{closure#0}, !>::{closure#0}, !>
  20:     0x79eea0cee7d0 - rustc_middle[ecc07153edf3c281]::util::bug::bug_fmt
  21:     0x79eea4e08d30 - <rustc_codegen_llvm[7d5a1ffcd7eaee82]::LlvmCodegenBackend as rustc_codegen_ssa[735fc0e7ecd285d]::traits::backend::CodegenBackend>::join_codegen
  22:     0x79eea4a8d18b - <rustc_interface[c31201428b712578]::queries::Linker>::link
  23:     0x79eea4c12862 - rustc_interface[c31201428b712578]::interface::run_compiler::<core[1a380081440346cb]::result::Result<(), rustc_span[4d50fd03223eefaa]::ErrorGuaranteed>, rustc_driver_impl[ce01f96e2e949677]::run_compiler::{closure#0}>::{closure#1}
  24:     0x79eea4d47869 - std[fba9fafec3bdacf8]::sys_common::backtrace::__rust_begin_short_backtrace::<rustc_interface[c31201428b712578]::util::run_in_thread_with_globals<rustc_interface[c31201428b712578]::interface::run_compiler<core[1a380081440346cb]::result::Result<(), rustc_span[4d50fd03223eefaa]::ErrorGuaranteed>, rustc_driver_impl[ce01f96e2e949677]::run_compiler::{closure#0}>::{closure#1}, core[1a380081440346cb]::result::Result<(), rustc_span[4d50fd03223eefaa]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[1a380081440346cb]::result::Result<(), rustc_span[4d50fd03223eefaa]::ErrorGuaranteed>>
  25:     0x79eea4d4766a - <<std[fba9fafec3bdacf8]::thread::Builder>::spawn_unchecked_<rustc_interface[c31201428b712578]::util::run_in_thread_with_globals<rustc_interface[c31201428b712578]::interface::run_compiler<core[1a380081440346cb]::result::Result<(), rustc_span[4d50fd03223eefaa]::ErrorGuaranteed>, rustc_driver_impl[ce01f96e2e949677]::run_compiler::{closure#0}>::{closure#1}, core[1a380081440346cb]::result::Result<(), rustc_span[4d50fd03223eefaa]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[1a380081440346cb]::result::Result<(), rustc_span[4d50fd03223eefaa]::ErrorGuaranteed>>::{closure#2} as core[1a380081440346cb]::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
  26:     0x79eea630ee3b - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::hdf5fcef8be77a431
                               at /rustc/3f5fd8dd41153bc5fdca9427e9e05be2c767ba23/library/alloc/src/boxed.rs:2063:9
  27:     0x79eea630ee3b - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::h8e8c5ceee46ee198
                               at /rustc/3f5fd8dd41153bc5fdca9427e9e05be2c767ba23/library/alloc/src/boxed.rs:2063:9
  28:     0x79eea630ee3b - std::sys::pal::unix::thread::Thread::new::thread_start::hb85dbfa54ba503d6
                               at /rustc/3f5fd8dd41153bc5fdca9427e9e05be2c767ba23/library/std/src/sys/pal/unix/thread.rs:108:17
  29:     0x79ee9f89caa4 - start_thread
                               at ./nptl/pthread_create.c:447:8
  30:     0x79ee9f929c3c - __GI___clone3
                               at ./misc/../sysdeps/unix/sysv/linux/x86_64/clone3.S:78
  31:                0x0 - <unknown>

@zsalke zsalke added C-bug Category: This is a bug. I-ICE Issue: The compiler panicked, giving an Internal Compilation Error (ICE) ❄️ T-compiler Relevant to the compiler team, which will review and decide on the PR/issue. labels Apr 16, 2025
@rustbot rustbot added the needs-triage This issue may need triage. Remove it if it has been sufficiently triaged. label Apr 16, 2025
@bjorn3
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bjorn3 commented Apr 16, 2025

The OS returned a resource exhaustion error when rustc tried to spawn a thread. I guess we could change it to show a nicer error, but rustc is likely not at fault here.

@ChrisDenton
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We definitely shouldn't ICE in this case.

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C-bug Category: This is a bug. I-ICE Issue: The compiler panicked, giving an Internal Compilation Error (ICE) ❄️ needs-triage This issue may need triage. Remove it if it has been sufficiently triaged. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
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