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Avoid suspending panicking thread while crashing (#36645)

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On the latest build @maxbrunsfeld got a panic that hung zed. It appeared
that the hang occured after the minidump had been successfully written,
so our theory on what happened is that the `suspend_all_other_threads`
call in the crash handler suspended the panicking thread (due to the
signal from simulate_exception being received on a different thread),
and then when the crash handler returned everything was suspended so the
panic hook never made it to the `process::abort`.

This change makes the crash handler avoid _both_ the current and the
panicking thread which should avoid that scenario.

Release Notes:

- N/A
This commit is contained in:
Julia Ryan 2025-08-21 05:33:45 -05:00
parent c5d96e1ef8
commit ca897fcd2f
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1 changed files with 14 additions and 1 deletions
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15
crates/crashes/src/crashes.rs
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@ -4,6 +4,8 @@ use minidumper::{Client, LoopAction, MinidumpBinary};
use release_channel::{RELEASE_CHANNEL, ReleaseChannel};
use serde::{Deserialize, Serialize};
#[cfg(target_os = "macos")]
use std::sync::atomic::AtomicU32;
use std::{
env,
fs::{self, File},
@ -26,6 +28,9 @@ pub static REQUESTED_MINIDUMP: AtomicBool = AtomicBool::new(false);
const CRASH_HANDLER_PING_TIMEOUT: Duration = Duration::from_secs(60);
const CRASH_HANDLER_CONNECT_TIMEOUT: Duration = Duration::from_secs(10);
#[cfg(target_os = "macos")]
static PANIC_THREAD_ID: AtomicU32 = AtomicU32::new(0);
pub async fn init(crash_init: InitCrashHandler) {
if *RELEASE_CHANNEL == ReleaseChannel::Dev && env::var("ZED_GENERATE_MINIDUMPS").is_err() {
return;
@ -110,9 +115,10 @@ unsafe fn suspend_all_other_threads() {
mach2::task::task_threads(task, &raw mut threads, &raw mut count);
}
let current = unsafe { mach2::mach_init::mach_thread_self() };
let panic_thread = PANIC_THREAD_ID.load(Ordering::SeqCst);
for i in 0..count {
let t = unsafe { *threads.add(i as usize) };
if t != current {
if t != current && t != panic_thread {
unsafe { mach2::thread_act::thread_suspend(t) };
}
}
@ -238,6 +244,13 @@ pub fn handle_panic(message: String, span: Option<&Location>) {
)
.ok();
log::error!("triggering a crash to generate a minidump...");
#[cfg(target_os = "macos")]
PANIC_THREAD_ID.store(
unsafe { mach2::mach_init::mach_thread_self() },
Ordering::SeqCst,
);
#[cfg(target_os = "linux")]
CrashHandler.simulate_signal(crash_handler::Signal::Trap as u32);
#[cfg(not(target_os = "linux"))]