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fix: disable uvloop by default (libuv abort under backend connection churn) #134

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Merged
ServerSideHannes merged 1 commit into from
Jul 17, 2026
+12 −7
Merged

fix: disable uvloop by default (libuv abort under backend connection churn) #134

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19 changes: 12 additions & 7 deletions s3proxy/main.py
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Original file line number Diff line number Diff line change
Expand Up @@ -20,13 +20,18 @@

def main():
"""CLI entry point for running S3Proxy server."""
try:
import uvloop

uvloop.install()
logger.info("Using uvloop for improved performance")
except ImportError:
pass
# uvloop 0.22.1 on Python 3.14 dies with a libuv abort (uv__io_poll assertion,
# preceded by "OSError: [Errno 9] Bad file descriptor" from TCPTransport) when
# the backend drops connections under load — killed 3 pods on 2026-07-16 with
# every in-flight upload. Off unless explicitly re-enabled.
if os.environ.get("S3PROXY_UVLOOP", "0") == "1":
try:
import uvloop

uvloop.install()
logger.info("Using uvloop for improved performance")
except ImportError:
pass

parser = argparse.ArgumentParser(description="S3Proxy - Transparent S3 encryption")
parser.add_argument("--ip", default="0.0.0.0", help="Bind address")
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