diff --git a/playwright/main.py b/playwright/main.py
index 4726ef4bf..049535ec6 100644
--- a/playwright/main.py
+++ b/playwright/main.py
@@ -13,6 +13,7 @@
# limitations under the License.
import asyncio
+import io
import subprocess
import sys
from typing import Any
@@ -45,11 +46,21 @@ async def run_driver_async() -> Connection:
driver_name = compute_driver_name()
driver_executable = package_path / "drivers" / driver_name
+ # Sourced from: https://github.com/pytest-dev/pytest/blob/49827adcb9256c9c9c06a25729421dcc3c385edc/src/_pytest/faulthandler.py#L73-L80
+ def _get_stderr_fileno() -> int:
+ try:
+ return sys.stderr.fileno()
+ except io.UnsupportedOperation:
+ # pytest-xdist monkeypatches sys.stderr with an object that is not an actual file.
+ # https://docs.python.org/3/library/faulthandler.html#issue-with-file-descriptors
+ # This is potentially dangerous, but the best we can do.
+ return sys.__stderr__.fileno()
+
proc = await asyncio.create_subprocess_exec(
str(driver_executable),
stdin=asyncio.subprocess.PIPE,
stdout=asyncio.subprocess.PIPE,
- stderr=sys.stderr,
+ stderr=_get_stderr_fileno(),
limit=32768,
)
assert proc.stdout
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