FAILED: patch "[PATCH] rpcrdma: arm rn_done before publishing the notification" failed to apply to 6.12-stable tree

PATCH New [email protected] 2 participants 2 messages Sep 3 – Sep 8

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author maintainer

2026-09-03 14:30 UTC #0 lore raw

The patch below does not apply to the 6.12-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-6.12.y
git checkout FETCH_HEAD
git cherry-pick -x 5b06f706374c37375bdff9d21cc10e61df925a92
# <resolve conflicts, build, test, etc.>
git commit -s
git send-email --to '<[email protected]>' --in-reply-to '2026090359-consensus-citizen-be20@gregkh' --subject-prefix 'PATCH 6.12.y' 'HEAD^..'

Possible dependencies:

thanks,

greg k-h

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

From 5b06f706374c37375bdff9d21cc10e61df925a92 Mon Sep 17 00:00:00 2001
From: Chuck Lever <[email protected]>
Date: Mon, 1 Jun 2026 16:17:03 -0400
Subject: [PATCH] rpcrdma: arm rn_done before publishing the notification

rpcrdma_rn_register() inserts @rn into rd_xa with xa_alloc() before storing the caller's callback in rn->rn_done. The xarray makes @rn reachable to rpcrdma_remove_one(), which walks rd_xa and invokes rn->rn_done(rn) for every registered notification. A device removal that races a fresh registration can therefore observe @rn with rn_done still NULL, because the notification objects are zero allocated by their owners, and call through a NULL function pointer.

Store rn->rn_done before xa_alloc() publishes @rn. The xarray's store-side and load-side ordering then guarantees that any CPU which finds @rn in rd_xa also observes the armed callback.

rpcrdma_rn_unregister() treats a non-NULL rn_done as the sentinel for a completed registration, so the early store must not survive a failed registration. Clear rn_done again when xa_alloc() fails. Were it left set, the failed-accept cleanup path would call rpcrdma_rn_unregister() on an @rn that was never inserted, erasing an unrelated rd_xa slot and underflowing rd_kref.

Fixes 7e86845a0346 ("rpcrdma: Implement generic device removal")

Cc [email protected]

Link https://patch.msgid.link/[email protected] open here

Signed-off-by Chuck Lever <[email protected]>

net/sunrpc/xprtrdma/ib_client.c +19 -7

index 69166d5d9987..188f7a13397f 100644
@@ -52,8 +52,8 @@ static struct rpcrdma_device *rpcrdma_get_client_data(struct ib_device *device)
  * is unregistered first.
  *
  * On failure, a negative errno is returned. rn->rn_done is left
- * NULL on every failure path (it is assigned only after xa_alloc
- * and kref_get have both succeeded), so the @rn may safely be
+ * NULL on every failure path (it is armed before xa_alloc but
+ * cleared again if xa_alloc fails), so the @rn may safely be
  * passed to rpcrdma_rn_unregister() without a separate
  * registered/unregistered flag in the caller.
  */

@@ -66,10 +66,21 @@ int rpcrdma_rn_register(struct ib_device *device,
 	if (!rd || test_bit(RPCRDMA_RD_F_REMOVING, &rd->rd_flags))
 		return -ENETUNREACH;
 
-	if (xa_alloc(&rd->rd_xa, &rn->rn_index, rn, xa_limit_32b, GFP_KERNEL) < 0)
-		return -ENOMEM;
-	kref_get(&rd->rd_kref);
+	/*
+	 * Arm rn_done before xa_alloc() publishes @rn: once @rn is
+	 * visible in rd_xa, a concurrent rpcrdma_remove_one() can
+	 * call rn->rn_done(), so the pointer must already be set.
+	 *
+	 * Restore NULL if xa_alloc() fails. rn_done doubles as the
+	 * registration sentinel for rpcrdma_rn_unregister(); a stale
+	 * value would unregister an @rn that was never inserted.
+	 */
 	rn->rn_done = done;
+	if (xa_alloc(&rd->rd_xa, &rn->rn_index, rn, xa_limit_32b, GFP_KERNEL) < 0) {
+		rn->rn_done = NULL;
+		return -ENOMEM;
+	}
+	kref_get(&rd->rd_kref);
 	trace_rpcrdma_client_register(device, rn);
 	return 0;
 }

@@ -102,8 +113,9 @@ void rpcrdma_rn_unregister(struct ib_device *device,
 
 	/*
 	 * rn_done is the registration sentinel: rpcrdma_rn_register
-	 * assigns it last, after xa_alloc and kref_get have both
-	 * succeeded. A NULL rn_done means this notification was
+	 * leaves it NULL on every failure path, clearing it again if
+	 * xa_alloc fails, so a non-NULL rn_done marks a completed
+	 * registration. A NULL rn_done means this notification was
 	 * never registered (or its registration failed) or has
 	 * already been unregistered, and the call is a no-op.
 	 * Without this guard, rn_index == 0 from a kzalloc'd

Sasha Levin

maintainer

2026-09-08 23:25 UTC #1 lore raw

PATCH 1/1 rpcrdma: arm rn_done before publishing the notification

From: Chuck Lever <[email protected]>

[ Upstream commit 5b06f706374c37375bdff9d21cc10e61df925a92 ]

Store rn->rn_done before xa_alloc() publishes @rn. The xarray's store-side and load-side ordering then guarantees that any CPU which finds @rn in rd_xa also observes the armed callback.

Fixes 7e86845a0346 ("rpcrdma: Implement generic device removal")

Cc [email protected]

Link https://patch.msgid.link/[email protected] open here

Signed-off-by Chuck Lever <[email protected]>

Signed-off-by Sasha Levin <[email protected]>

---
 net/sunrpc/xprtrdma/ib_client.c | 24 ++++++++++++++++++------
 1 file changed, 18 insertions(+), 6 deletions(-)

net/sunrpc/xprtrdma/ib_client.c +18 -6

index cfc24e21d260c..888638318b6dd 100644
@@ -52,8 +52,8 @@ static struct rpcrdma_device *rpcrdma_get_client_data(struct ib_device *device)
  * is unregistered first.
  *
  * On failure, a negative errno is returned. rn->rn_done is left
- * NULL on every failure path (it is assigned only after xa_alloc
- * and kref_get have both succeeded), so the @rn may safely be
+ * NULL on every failure path (it is armed before xa_alloc but
+ * cleared again if xa_alloc fails), so the @rn may safely be
  * passed to rpcrdma_rn_unregister() without a separate
  * registered/unregistered flag in the caller.
  */

@@ -66,10 +66,21 @@ int rpcrdma_rn_register(struct ib_device *device,
 	if (!rd || test_bit(RPCRDMA_RD_F_REMOVING, &rd->rd_flags))
 		return -ENETUNREACH;
 
-	if (xa_alloc(&rd->rd_xa, &rn->rn_index, rn, xa_limit_32b, GFP_KERNEL) < 0)
+	/*
+	 * Arm rn_done before xa_alloc() publishes @rn: once @rn is
+	 * visible in rd_xa, a concurrent rpcrdma_remove_one() can
+	 * call rn->rn_done(), so the pointer must already be set.
+	 *
+	 * Restore NULL if xa_alloc() fails. rn_done doubles as the
+	 * registration sentinel for rpcrdma_rn_unregister(); a stale
+	 * value would unregister an @rn that was never inserted.
+	 */
+	rn->rn_done = done;
+	if (xa_alloc(&rd->rd_xa, &rn->rn_index, rn, xa_limit_32b, GFP_KERNEL) < 0) {
+		rn->rn_done = NULL;
 		return -ENOMEM;
+	}
 	kref_get(&rd->rd_kref);
-	rn->rn_done = done;
 	trace_rpcrdma_client_register(device, rn);
 	return 0;
 }

@@ -102,8 +113,9 @@ void rpcrdma_rn_unregister(struct ib_device *device,
 
 	/*
 	 * rn_done is the registration sentinel: rpcrdma_rn_register
-	 * assigns it last, after xa_alloc and kref_get have both
-	 * succeeded. A NULL rn_done means this notification was
+	 * leaves it NULL on every failure path, clearing it again if
+	 * xa_alloc fails, so a non-NULL rn_done marks a completed
+	 * registration. A NULL rn_done means this notification was
 	 * never registered (or its registration failed) or has
 	 * already been unregistered, and the call is a no-op.
 	 * Without this guard, rn_index == 0 from a kzalloc'd

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