FAILED: patch "[PATCH] fs: dlm: fix race setting stop tx flag" failed to apply to 5.15-stable tree

The patch below does not apply to the 5.15-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 <[email protected]>.

To reproduce the conflict and resubmit, you may use the following commands:

git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-5.15.y
git checkout FETCH_HEAD
git cherry-pick -x 164272113b685927126c938b4a9cbd2075eb15ee
# <resolve conflicts, build, test, etc.>
git commit -s
git send-email --to '<[email protected]>' --in-reply-to '[email protected]' --subject-prefix 'PATCH 5.15.y' HEAD^..

Possible dependencies:

164272113b68 ("fs: dlm: fix race setting stop tx flag") e01c4b7bd415 ("fd: dlm: trace send/recv of dlm message and rcom") 00e99ccde757 ("dlm: use __le types for dlm messages") 2f9dbeda8dc0 ("dlm: use __le types for rcom messages") 3428785a65da ("dlm: use __le types for dlm header") a8449f232ee3 ("dlm: add __CHECKER__ for false positives") 6c2e3bf68f3e ("fs: dlm: filter user dlm messages for kernel locks") 9af5b8f0ead7 ("fs: dlm: add debugfs rawmsg send functionality") 92732376fd29 ("fs: dlm: trace socket handling") f1d3b8f91d96 ("fs: dlm: initial support for tracepoints")

thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

From 164272113b685927126c938b4a9cbd2075eb15ee Mon Sep 17 00:00:00 2001
From: Alexander Aring <[email protected]>
Date: Thu, 12 Jan 2023 17:10:34 -0500
Subject: [PATCH] fs: dlm: fix race setting stop tx flag

This patch sets the stop tx flag before we commit the dlm message. This flag will report about unexpected transmissions after we send the DLM_FIN message out, which should be the last message sent. When we commit the dlm fin message, it could be that we already got an ack back and the CLOSED state change already happened. We should not set this flag when we are in CLOSED state. To avoid this race we simply set the tx flag before the state change can be in progress by moving it before dlm_midcomms_commit_mhandle().

index a3eb19c8cec5..9d459d5bf800 100644
@@ -406,6 +406,7 @@ static int dlm_send_fin(struct midcomms_node *node,
 	if (!mh)
 		return -ENOMEM;
 
+	set_bit(DLM_NODE_FLAG_STOP_TX, &node->flags);
 	mh->ack_rcv = ack_rcv;
 
 	m_header = (struct dlm_header *)ppc;

@@ -417,7 +418,6 @@ static int dlm_send_fin(struct midcomms_node *node,
 
 	pr_debug("sending fin msg to node %d\n", node->nodeid);
 	dlm_midcomms_commit_mhandle(mh, NULL, 0);
-	set_bit(DLM_NODE_FLAG_STOP_TX, &node->flags);
 
 	return 0;
 }