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 4F0251C0DE7; Mon, 1 Apr 2024 16:46:27 +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=1711989987; cv=none; b=l4eGdiTlH+Z63y7TzM5W8kr9LYSFUMnDZoI2/cMaoL2WIRlGQ+gQ9EM+55+uozv8U10tEpnngYOp+6OlL/vlTBuRKKhQmBJoQW20/X/Enbc6NXyRynB9kdYhkiytSmAYMlS8zMnCcuRXuzs1EJxAZZb6gywVKZdeQVeSzgivc44= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1711989987; c=relaxed/simple; bh=8bPielUPj091FCau8e63UmZh/qWE0FXC+4JoN0WwcB8=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=El9iJPVDscc46i/Oo0kCtOsDqsOcf+AgSecPldHCA9QZ4dTKSdql2MqxyOk4X1ZPdNa5b9Ds8HuMxfZta1o+YxDHA50gSsUqu7dKkrhzbXPXJkaZ+yKnQYOdWWRIvQ5IdhYKjhi7PSsvYUkfuShgJpdp6tim4fclwXJqE8iC+p0= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=oJ2sr+E8; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="oJ2sr+E8" Received: by smtp.kernel.org (Postfix) with ESMTPSA id AD69CC433F1; Mon, 1 Apr 2024 16:46:26 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1711989987; bh=8bPielUPj091FCau8e63UmZh/qWE0FXC+4JoN0WwcB8=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=oJ2sr+E8yQ4CAKCPfoeGU8zC2jYV6aqagDUcjc6pC9wGZeW6ueIL6bbkIeL99mUdV 0usA/ac0kG8GTTSiU3oO6PBRAzwqdoFQNcDsQ7Ap8PP0UdULOQQsmo41TPcT2ZIi9h DND/m2IdWaAzLCvOUGXpI4ouPOqCKVe+BdBOhnLo= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, John Pittman , Mikulas Patocka , Mike Snitzer , Sasha Levin Subject: [PATCH 6.6 184/396] dm snapshot: fix lockup in dm_exception_table_exit Date: Mon, 1 Apr 2024 17:43:53 +0200 Message-ID: <20240401152553.426683007@linuxfoundation.org> X-Mailer: git-send-email 2.44.0 In-Reply-To: <20240401152547.867452742@linuxfoundation.org> References: <20240401152547.867452742@linuxfoundation.org> User-Agent: quilt/0.67 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 6.6-stable review patch. If anyone has any objections, please let me know. ------------------ From: Mikulas Patocka [ Upstream commit 6e7132ed3c07bd8a6ce3db4bb307ef2852b322dc ] 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 Signed-off-by: Sasha Levin --- 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_exception_table *et, for (i = 0; i < size; i++) { slot = et->table + i; - 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(); + } } kvfree(et->table); -- 2.43.0