From nobody Sun Feb 8 14:12:39 2026 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 8FFED1B6FB6; Wed, 27 Mar 2024 12:28:29 +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=1711542509; cv=none; b=eZxkG0yPvBR/F3fq8127EW8/1ihRsGHzz6cE433XciytRiX2ds52Ot9OkdoOI5wCpW4sysAz6g5fQzAG6u192bPUUNOVERLlOyk7A5CmUsN5eOIABWMgpqRsfkGfoZBKUgCjjXZNLRph5nQZon4lJA0O6uY6fZyvlKeZYBO8CW0= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1711542509; c=relaxed/simple; bh=qILXJDfEFX4ZvfUyQtQSZ91X4eaPsw7idazy43hhUPg=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=Asy7YTvOlpp5895dvIYzMEgITh9MKnF1OzV8tKHga+EZhkkDtn34cPn0eYIGbY2CYalK82kNcjSh0z74B5mWmrZxWtUTsuxfuDfIZvFfGRqBDo8ETBFgqhwSz9AWU8qQ5gRz/YLuF7KSwtR0hXqxA7B9nQObOxOZQSlx59F8QvY= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=lNiZ24oC; 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="lNiZ24oC" Received: by smtp.kernel.org (Postfix) with ESMTPSA id A2E61C433C7; Wed, 27 Mar 2024 12:28:28 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1711542509; bh=qILXJDfEFX4ZvfUyQtQSZ91X4eaPsw7idazy43hhUPg=; h=From:To:Cc:Subject:Date:From; b=lNiZ24oCexiEmuZ7PM4dYQS+I56/lo+Uw07F2cmNzaukPJG2NbpgPjMH1HRYDpZHU kDe+YUFoQMQTXCSqx0qzBmfWUYFbtMz7ZFod0noZ/KBHHuXr5nDNibZAFJjzSrjg15 K+sKnpQUAKml6ww21l0YLG8GDjAhyka0m060OnLbC2mkUTmWED6Hmgr0ZtIWwyUw6V XcAdMLTOy6tas0dVCb8CsPHKeVwuJRChZxM/CEntlvyKAAM/+dCQzPHQH0F3QAENcp v4Jfa1yesBGVVwXaDRmv4HSfO7SszkNlw43ULMgPHbdemQ1xBgEuTUzXmqSBKqed+C f7Yyl6TjP0Cjg== From: Sasha Levin To: stable@vger.kernel.org, mpatocka@redhat.com Cc: John Pittman , Mike Snitzer , dm-devel@lists.linux.dev, linux-kernel@vger.kernel.org Subject: FAILED: Patch "dm snapshot: fix lockup in dm_exception_table_exit" failed to apply to 4.19-stable tree Date: Wed, 27 Mar 2024 08:28:27 -0400 Message-ID: <20240327122827.2842757-1-sashal@kernel.org> X-Mailer: git-send-email 2.43.0 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Patchwork-Hint: ignore X-stable: review Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" The patch below does not apply to the 4.19-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to . Thanks, Sasha Reported-by: John Pittman ------------------ original commit in Linus's tree ------------------ From 6e7132ed3c07bd8a6ce3db4bb307ef2852b322dc Mon Sep 17 00:00:00 2001 From: Mikulas Patocka Date: Wed, 20 Mar 2024 18:43:11 +0100 Subject: [PATCH] dm snapshot: fix lockup in dm_exception_table_exit There was reported lockup when we exit a snapshot with many exceptions. Fix this by adding "cond_resched" to the loop that frees the exceptions. Reported-by: John Pittman Cc: stable@vger.kernel.org Signed-off-by: Mikulas Patocka Signed-off-by: Mike Snitzer --- drivers/md/dm-snap.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/drivers/md/dm-snap.c b/drivers/md/dm-snap.c index bf7a574499a34..0ace06d1bee38 100644 --- a/drivers/md/dm-snap.c +++ b/drivers/md/dm-snap.c @@ -684,8 +684,10 @@ static void dm_exception_table_exit(struct dm_exceptio= n_table *et, for (i =3D 0; i < size; i++) { slot =3D et->table + i; =20 - hlist_bl_for_each_entry_safe(ex, pos, n, slot, hash_list) + hlist_bl_for_each_entry_safe(ex, pos, n, slot, hash_list) { kmem_cache_free(mem, ex); + cond_resched(); + } } =20 kvfree(et->table); --=20 2.43.0