diff options
Diffstat (limited to 'library/std/src/panicking.rs')
| -rw-r--r-- | library/std/src/panicking.rs | 8 |
1 files changed, 6 insertions, 2 deletions
diff --git a/library/std/src/panicking.rs b/library/std/src/panicking.rs index ebd05415695..418a855fb72 100644 --- a/library/std/src/panicking.rs +++ b/library/std/src/panicking.rs @@ -253,16 +253,20 @@ fn default_hook(info: &PanicHookInfo<'_>) { let name = thread.as_ref().and_then(|t| t.name()).unwrap_or("<unnamed>"); let write = |err: &mut dyn crate::io::Write| { + // Use a lock to prevent mixed output in multithreading context. + // Some platforms also require it when printing a backtrace, like `SymFromAddr` on Windows. + let mut lock = backtrace::lock(); let _ = writeln!(err, "thread '{name}' panicked at {location}:\n{msg}"); static FIRST_PANIC: AtomicBool = AtomicBool::new(true); match backtrace { + // SAFETY: we took out a lock just a second ago. Some(BacktraceStyle::Short) => { - drop(backtrace::print(err, crate::backtrace_rs::PrintFmt::Short)) + drop(lock.print(err, crate::backtrace_rs::PrintFmt::Short)) } Some(BacktraceStyle::Full) => { - drop(backtrace::print(err, crate::backtrace_rs::PrintFmt::Full)) + drop(lock.print(err, crate::backtrace_rs::PrintFmt::Full)) } Some(BacktraceStyle::Off) => { if FIRST_PANIC.swap(false, Ordering::Relaxed) { |