linux-kernel - Re: [syzbot] [wireguard?] WARNING in kthread

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Message-Id: <20240731110501.2425-1-hdanton@sina.com>
Date: Wed, 31 Jul 2024 19:05:01 +0800
From: Hillf Danton <hdanton@...a.com>
To: syzbot <syzbot+943d34fa3cf2191e3068@...kaller.appspotmail.com>
Cc: linux-kernel@...r.kernel.org,
	syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [wireguard?] WARNING in kthread_unpark (2)

On Mon, 29 Jul 2024 08:48:30 -0700
> syzbot has found a reproducer for the following issue on:
> 
> HEAD commit:    dc1c8034e31b minmax: simplify min()/max()/clamp() implemen..
> git tree:       upstream
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=1022b573980000

#syz test upstream  dc1c8034e31b

--- x/kernel/workqueue.c
+++ y/kernel/workqueue.c
@@ -2679,7 +2679,8 @@ static void worker_attach_to_pool(struct
 		worker->flags |= WORKER_UNBOUND;
 	} else {
 		WARN_ON_ONCE(pool->flags & POOL_BH);
-		kthread_set_per_cpu(worker->task, pool->cpu);
+		if (!worker->rescue_wq)
+			kthread_set_per_cpu(worker->task, pool->cpu);
 	}
 
 	if (worker->rescue_wq)
--- x/drivers/input/misc/yealink.c
+++ y/drivers/input/misc/yealink.c
@@ -438,6 +438,8 @@ static void urb_irq_callback(struct urb
 
 	yealink_do_idle_tasks(yld);
 
+	if (status == -EPROTO)
+		return;
 	if (!yld->shutdown) {
 		ret = usb_submit_urb(yld->urb_ctl, GFP_ATOMIC);
 		if (ret && ret != -EPERM)
@@ -452,9 +454,12 @@ static void urb_ctl_callback(struct urb
 	struct yealink_dev *yld = urb->context;
 	int ret = 0, status = urb->status;
 
-	if (status)
+	if (status) {
 		dev_err(&yld->intf->dev, "%s - urb status %d\n",
 			__func__, status);
+		if (status == -EPROTO)
+			return;
+	}
 
 	switch (yld->ctl_data->cmd) {
 	case CMD_KEYPRESS:
--