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Fix allow_threads and EINTR handling by youknowone · Pull Request #7457 · RustPython/RustPython · GitHub

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Fix allow_threads and EINTR handling #7457

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Merged
youknowone merged 2 commits into from
Mar 20, 2026
Conversation 18 Commits 2 Checks 16 Files changed
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Fix allow_threads and EINTR handling #7457

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34b2946
Fix allow_threads and EINTR handling
youknowone Mar 17, 2026
ba58ffc
Remove expectedFailureIfWindows for testHashComparisonOfMethods
youknowone Mar 19, 2026
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1 change: 0 additions & 1 deletion Lib/test/_test_eintr.py
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Original file line number Diff line number Diff line change
Expand Up @@ -392,7 +392,6 @@ def test_os_open(self):
class TimeEINTRTest(EINTRBaseTest):
""" EINTR tests for the time module. """

@unittest.expectedFailure # TODO: RUSTPYTHON
def test_sleep(self):
t0 = time.monotonic()
time.sleep(self.sleep_time)
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1 change: 0 additions & 1 deletion Lib/test/test_class.py
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Expand Up @@ -614,7 +614,6 @@ def assertNotOrderable(self, a, b):
with self.assertRaises(TypeError):
a >= b

@unittest.expectedFailureIfWindows("TODO: RUSTPYTHON; AssertionError: 1543448294720 != 1543448295392")
def testHashComparisonOfMethods(self):
# Test comparison and hash of methods
class A:
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3 changes: 2 additions & 1 deletion crates/stdlib/src/multiprocessing.rs
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Expand Up @@ -193,7 +193,8 @@ mod _multiprocessing {
remaining.min(poll_ms)
};

let res = unsafe { WaitForSingleObjectEx(self.handle.as_raw(), wait_ms, 0) };
let handle = self.handle.as_raw();
let res = vm.allow_threads(|| unsafe { WaitForSingleObjectEx(handle, wait_ms, 0) });

match res {
WAIT_OBJECT_0 => {
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35 changes: 24 additions & 11 deletions crates/vm/src/stdlib/time.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -115,17 +115,30 @@ mod decl {

#[cfg(unix)]
{
// this is basically std::thread::sleep, but that catches interrupts and we don't want to;
let ts = nix::sys::time::TimeSpec::from(dur);
// Capture errno inside the closure: attach_thread (called by
// allow_threads on return) can clobber errno via syscalls.
let (res, err) = vm.allow_threads(|| {
let r = unsafe { libc::nanosleep(ts.as_ref(), core::ptr::null_mut()) };
(r, nix::Error::last_raw())
});
let interrupted = res == -1 && err == libc::EINTR;

if interrupted {
// Loop on nanosleep, recomputing the
// remaining timeout after each EINTR so that signals don't
// shorten the requested sleep duration.
use std::time::Instant;
let deadline = Instant::now() + dur;
loop {
Comment on lines +122 to +123

coderabbitai Bot Mar 19, 2026

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Choose a reason Spam Abuse Off Topic Outdated Duplicate Resolved Low Quality

⚠️ Potential issue | 🔴 Critical

🧩 Analysis chain

🏁 Script executed:

#!/bin/bash
set -euo pipefail

echo "== sleep deadline computation =="
rg -nP --type=rust 'Instant::now\(\)\s*\+\s*dur|checked_add\(' crates/vm/src/stdlib/time.rs -C2

echo
echo "== Duration conversion path used by time.sleep =="
rg -nP --type=rust 'try_into_value::<Duration>|from_secs_f64|try_from_secs_f64|Duration' crates/vm/src/stdlib/time.rs crates/vm/src -C2

echo
echo "== Existing oversized sleep tests/messages =="
rg -nP --type=rust --type=py 'sleep.*(Overflow|too large|overflow|huge)' -C2

Repository: RustPython/RustPython

Length of output: 29666

Use Instant::checked_add() to prevent panic on overflow.

Line 122 uses unchecked Instant::now() + dur, which will panic if the duration is large enough to overflow the Instant. The Duration conversion at line 101 does not validate that the resulting value is within Instant's safe range. Replace with checked_add() and raise OverflowError.

Proposed fix 
             use std::time::Instant;
-            let deadline = Instant::now() + dur;
+            let deadline = Instant::now()
+                .checked_add(dur)
+                .ok_or_else(|| vm.new_overflow_error("sleep length is too large"))?;
📝 Committable suggestion

‼️ IMPORTANT
Carefully review the code before committing. Ensure that it accurately replaces the highlighted code, contains no missing lines, and has no issues with indentation. Thoroughly test & benchmark the code to ensure it meets the requirements.

Suggested change
let deadline = Instant::now() + dur;
loop {
let deadline = Instant::now()
.checked_add(dur)
.ok_or_else(|| vm.new_overflow_error("sleep length is too large"))?;
loop {
🤖 Prompt for AI Agents 
Verify each finding against the current code and only fix it if needed.

In `@crates/vm/src/stdlib/time.rs` around lines 122 - 123, Replace the unchecked
addition Instant::now() + dur when computing deadline with
Instant::now().checked_add(dur) and handle the None case by returning/raising an
OverflowError; specifically, change the code that assigns deadline (the
Instant::now() + dur expression) to use
Instant::now().checked_add(dur).ok_or_else(|| OverflowError::new("timeout
overflow")) (or the crate's equivalent VM error constructor) before entering the
loop so that overflow is detected and an OverflowError is returned instead of
panicking.

let remaining = deadline.saturating_duration_since(Instant::now());
if remaining.is_zero() {
break;
}
let ts = nix::sys::time::TimeSpec::from(remaining);
let (res, err) = vm.allow_threads(|| {
let r = unsafe { libc::nanosleep(ts.as_ref(), core::ptr::null_mut()) };
(r, nix::Error::last_raw())
});
if res == 0 {
break;
}
if err != libc::EINTR {
return Err(
vm.new_os_error(format!("nanosleep: {}", nix::Error::from_raw(err)))
);
}
// EINTR: run signal handlers, then retry with remaining time
vm.check_signals()?;
}
}
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