linux-kernel - [PATCH AUTOSEL 6.1 009/212] SUNRPC: Don't allow waiting for exiting tasks

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Message-Id: <20250505230624.2692522-9-sashal@kernel.org>
Date: Mon,  5 May 2025 19:03:01 -0400
From: Sasha Levin <sashal@...nel.org>
To: linux-kernel@...r.kernel.org,
	stable@...r.kernel.org
Cc: Trond Myklebust <trond.myklebust@...merspace.com>,
	Jeff Layton <jlayton@...nel.org>,
	Sasha Levin <sashal@...nel.org>,
	chuck.lever@...cle.com,
	trondmy@...nel.org,
	anna@...nel.org,
	davem@...emloft.net,
	edumazet@...gle.com,
	kuba@...nel.org,
	pabeni@...hat.com,
	linux-nfs@...r.kernel.org,
	netdev@...r.kernel.org
Subject: [PATCH AUTOSEL 6.1 009/212] SUNRPC: Don't allow waiting for exiting tasks

From: Trond Myklebust <trond.myklebust@...merspace.com>

[ Upstream commit 14e41b16e8cb677bb440dca2edba8b041646c742 ]

Once a task calls exit_signals() it can no longer be signalled. So do
not allow it to do killable waits.

Reviewed-by: Jeff Layton <jlayton@...nel.org>
Signed-off-by: Trond Myklebust <trond.myklebust@...merspace.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 net/sunrpc/sched.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/net/sunrpc/sched.c b/net/sunrpc/sched.c
index 9b45fbdc90cab..73bc39281ef5f 100644
--- a/net/sunrpc/sched.c
+++ b/net/sunrpc/sched.c
@@ -276,6 +276,8 @@ EXPORT_SYMBOL_GPL(rpc_destroy_wait_queue);
 
 static int rpc_wait_bit_killable(struct wait_bit_key *key, int mode)
 {
+	if (unlikely(current->flags & PF_EXITING))
+		return -EINTR;
 	schedule();
 	if (signal_pending_state(mode, current))
 		return -ERESTARTSYS;
-- 
2.39.5