Also tries again on EAGAIN in futex_lock

Author: ruihe774

library/std/src/sys/pal/unix/pi_futex.rs

@@ -33,7 +33,14 @@ pub fn futex_lock(futex: &AtomicU32) -> io::Result<()> {
             )
         }) {
             Ok(_) => return Ok(()),
-            Err(e) if e.raw_os_error() == Some(libc::EINTR) => continue,
+            Err(e)
+                if e.raw_os_error().is_some_and(|errno| {
+                    errno == libc::EINTR // interrupted by signal
+                || errno == libc::EAGAIN // owner dying, need to try again; mutex is going to be poisoned
+                }) =>
+            {
+                continue;
+            }
             Err(e) => return Err(e),
         }
     }