From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id CE330145343; Sun, 24 Mar 2024 23:13:51 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1711322031; cv=none; b=bFaUuPKHNvRJhRi+pxQozuBHcO6UL5jQib1jpDaeaWrXDHEeF7O6DAI5vUurFEgO24HcWgyB6vIOZ+0Py46bFop4ddHTSdofz+64H6zI1iKRYCryAIMurQT1EpYz6dmj/ALZifd21e8UTeEBxg4V1yNZVlBQBwLvHuQ4/lTTE9I= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1711322031; c=relaxed/simple; bh=ixIHT+JxOs9u7DVRarGZieExS4raCUeJ/OKOiBYn+fs=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=l0m69TynS/91fK7dsBZ1GaJguKrYqJ/B3aAVelQMheyLWG8BZfTttBYhIkd3bGljm/RK45eyKIbc7yUZ2BYpouhHnzrav6m+q2Cmo2athjt/0XctqO82FBD77SBJM03YHOB1OgxFc46CZeTcvQQVbdzaHbEV8DSZw8CMY4vVw+g= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=iEsO+LQe; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="iEsO+LQe" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 161B2C433C7; Sun, 24 Mar 2024 23:13:51 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1711322031; bh=ixIHT+JxOs9u7DVRarGZieExS4raCUeJ/OKOiBYn+fs=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=iEsO+LQeAbnQ4ACiRz6aO72KqVEWQJP9bB0NYKJxG+uDrh4YkQJiwdWIyF8ZZSbTr fvtBXNusX3lADX2D+7Xb2g5FgFie0JmQkElFZWZmyllAAAKu2y2XZV0sSXs4IFhcbg hEZjH/CwLBqaWxkXvQ8CFS3FYSWeLKeJajL0T/DrbZUJIq8D6YRS6mWaZT2wMYgHiN RQOcvazujIrjJoiPo/pDeHDLnFCstJYHMacUujcOc60jOkyeEyfCE1rzbdQ3fvHkVs qWxJQs68THd6bDoztF7rdd9CADXqkYGnRtyGFJDbAbZcNgjyOWPHLVrzFt5yg0qwf/ 8HurDTUskYk7A== From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Kuniyuki Iwashima , Jakub Kicinski , Sasha Levin Subject: [PATCH 6.1 103/451] af_unix: Annotate data-race of gc_in_progress in wait_for_unix_gc(). Date: Sun, 24 Mar 2024 19:06:19 -0400 Message-ID: <20240324231207.1351418-104-sashal@kernel.org> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20240324231207.1351418-1-sashal@kernel.org> References: <20240324231207.1351418-1-sashal@kernel.org> Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit From: Kuniyuki Iwashima [ Upstream commit 31e03207119a535d0b0e3b3a7f91983aeb2cb14d ] gc_in_progress is changed under spin_lock(&unix_gc_lock), but wait_for_unix_gc() reads it locklessly. Let's use READ_ONCE(). Fixes: 5f23b734963e ("net: Fix soft lockups/OOM issues w/ unix garbage collector") Signed-off-by: Kuniyuki Iwashima Link: https://lore.kernel.org/r/20240123170856.41348-2-kuniyu@amazon.com Signed-off-by: Jakub Kicinski Signed-off-by: Sasha Levin --- net/unix/garbage.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/net/unix/garbage.c b/net/unix/garbage.c index ab2c83d58b62a..9bfffe2a7f020 100644 --- a/net/unix/garbage.c +++ b/net/unix/garbage.c @@ -198,7 +198,7 @@ void wait_for_unix_gc(void) if (READ_ONCE(unix_tot_inflight) > UNIX_INFLIGHT_TRIGGER_GC && !READ_ONCE(gc_in_progress)) unix_gc(); - wait_event(unix_gc_wait, gc_in_progress == false); + wait_event(unix_gc_wait, !READ_ONCE(gc_in_progress)); } /* The external entry point: unix_gc() */ -- 2.43.0