From mboxrd@z Thu Jan 1 00:00:00 1970 Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.remote-ip=100.103.45.18 ARC-Seal: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; cv=none; t=1792493575; b=mHLmWj97cuaWKhg7RJyTQAz3E07uCZQDSh7bqGLtW6UrwcL5FAW2TmEriS+r7o8fKqb9 yc0IGZKgwUkrA6zqT1Tg3JLxRmqEBFFnwlA06w00f5TCaopTEHAYY6lXQ0ely4n/AG7OD MCMbg1dcWAO8sLSHJQ9gBvc56CO+24vrfIzzUYnxrIkLe+JhDI2YpjX97WhjL6vNc1xQG X9s884CnwFq5k7wd1swrD5nHWnTsuDcZS56E2cii6ZyPLdYUoYVc3j8W3HtOWsQcI3wv9 GWv1UpHxUJGeL3VproTNNsjzeLfFLhWprcz3udv4Z9UZnDqpsuaJ181LrWdO9brZpIQ== ARC-Message-Signature: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; c=relaxed/relaxed; t=1792493575; h=Received:DKIM-Signature:Message-ID:Subject:From:To:Cc:Date: In-Reply-To:References:Autocrypt:Content-Type: Content-Transfer-Encoding:User-Agent:MIME-Version; bh=peDfrQbnwXL/9Wcvx6n6RnNkbKW+C5nzY+mUT/kbcWQ=; b=cdaeXumrF7W2edw0lQUmv56OMf/CvKkQZxjy1mMSaHYZeyl7+tNXLDc1GtcDk5+k4+Hq 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header.b=DQ/nb41H Received: by smtp.kernel.org (Postfix) with ESMTPSA id CA1141F000C4; Tue, 20 Oct 2026 10:52:53 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1792493574; bh=peDfrQbnwXL/9Wcvx6n6RnNkbKW+C5nzY+mUT/kbcWQ=; h=Subject:From:To:Cc:Date:In-Reply-To:References; b=DQ/nb41HsPLeBPRc1OrmIXXARmqMzM3NKoFWPm39qhREC93bB4UMKvKMJWNSHUPwM pZL4CxM6PkOmophmNFRlCllXO+ktXURP1d9mZNJrtrIqQzvxtmylISSTucFYsI8pwF 61gIxAJllBfcfpt4lZCNkwOwiCZKJYBT/6yq0xfH8jYZzz8AjOlhkBOSVpqAkERCd6 iF6vW3ktgAHexBxko6fPshwJAeuZghzSzqrNMUBMhBnEyRSKchWDJ7glPR4ORWPl+a v5IVYatDoWdjBJOZn/fNhxPV7dbhmLEk0kK/1VqJr2Zy1AOuyX1x0FpyO6GaHREWEj eOL0P3f86bXWQ== Message-ID: Subject: Re: [PATCH] SUNRPC: wake poll waiters when an empty pipe is unlinked From: Jeff Layton To: Avi Weiss , Trond Myklebust , Chuck Lever Cc: Anna Schumaker , NeilBrown , linux-nfs@vger.kernel.org Date: Tue, 20 Oct 2026 06:52:52 -0400 In-Reply-To: <20261020071455.775967-1-thnkslprpt@gmail.com> References: 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f8lfK1XVNbRq/R7GZ9zHESlsa35ha60yd/j3pu5hT2xyy8krV8vGhHvnJ1XRMJBAB/UYb6FyC7S+m QZIQXVeAA+smfTT0tDrisj1U5x6ZB9b3nBg65kc= Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable User-Agent: Evolution 3.60.2 (3.60.2-2.fc44) X-Mailing-List: linux-nfs@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 On Tue, 2026-10-20 at 10:14 +0300, Avi Weiss wrote: > When an empty rpc_pipefs pipe is unlinked, rpc_purge_list() returns > without waking the pipe wait queue. An existing epoll waiter can > remain blocked even though rpc_pipe_poll() reports EPOLLHUP and > EPOLLERR for the disconnected pipe. >=20 > Wake the wait queue after clearing RPC_I(inode)->pipe so existing > poll waiters are notified regardless of whether messages were purged. >=20 > Fixes: 9842ef3557ab ("SUNRPC: rpc_timeout_upcall_queue should not sleep") > Signed-off-by: Avi Weiss > --- >=20 > Tested with an empty rpc_pipefs pipe in QEMU: > - 7.3.0 baseline: fresh poll() reports HUP/ERR (0x18), > but an existing epoll_wait() times out. > - 7.3.0 with this patch: fresh poll() reports HUP/ERR (0x18), > and epoll_wait() returns events=3D0x18. >=20 > net/sunrpc/rpc_pipe.c | 1 + > 1 file changed, 1 insertion(+) >=20 > diff --git a/net/sunrpc/rpc_pipe.c b/net/sunrpc/rpc_pipe.c > index 9d349cfbc4831..68b4e040a77d9 100644 > --- a/net/sunrpc/rpc_pipe.c > +++ b/net/sunrpc/rpc_pipe.c > @@ -191,6 +191,7 @@ rpc_close_pipes(struct dentry *dentry) > cancel_delayed_work_sync(&pipe->queue_timeout); > rpc_inode_setowner(inode, NULL); > RPC_I(inode)->pipe =3D NULL; > + wake_up(&RPC_I(inode)->waitq); > inode_unlock(inode); > } > =20 >=20 > base-commit: c03c1a14507dfaf8b856c2608f9ac216021fc222 Reviewed-by: Jeff Layton