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test(run): re-sample main's signal mask past the posix_spawn window (LAB-11681) #41

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Merged
27Bslash6 merged 1 commit into from
Oct 30, 2026
Merged

test(run): re-sample main's signal mask past the posix_spawn window (LAB-11681) #41

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20 changes: 17 additions & 3 deletions tests/run.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -853,7 +853,8 @@ fn wait_until(ready: impl Fn() -> bool) {
#[test]
fn helper_threads_block_the_handled_signals() {
let s = Sandbox::new();
s.set("sleep", "2");
// Outlives the 2 s re-sample below, so ck is still running throughout.
s.set("sleep", "5");
let mut child = s.spawn(&["--ttl", "1h"]);
wait_until(|| s.runs() == 1);
let pid = child.id();
Expand All @@ -867,9 +868,22 @@ fn helper_threads_block_the_handled_signals() {
let mut helpers = 0;
for task in fs::read_dir(format!("/proc/{pid}/task")).unwrap() {
let tid = task.unwrap().file_name().into_string().unwrap();
let mask = mask_of(&tid);
let mut mask = mask_of(&tid);
if tid == pid.to_string() {
assert_eq!(mask & handled, 0, "the main thread blocks a handled signal");
// glibc's posix_spawn blocks every signal on the spawning thread
// until the child execs, and the command can record its run
// before main is scheduled again. A signal sent in that window
// stays pending, so only a mask that stays blocked is a fault.
let started = Instant::now();
while mask & handled != 0 && started.elapsed() < Duration::from_secs(2) {
sleep(Duration::from_millis(5));
mask = mask_of(&tid);
}
assert_eq!(
mask & handled,
0,
"the main thread blocks a handled signal: SigBlk {mask:016x}"
);
} else {
assert_eq!(
mask & handled,
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