linux-kernel - Re: [syzbot] [usb?] INFO: task hung in usb_port

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Message-Id: <20241022104635.2252-1-hdanton@sina.com>
Date: Tue, 22 Oct 2024 18:46:35 +0800
From: Hillf Danton <hdanton@...a.com>
To: syzbot <syzbot+f342ea16c9d06d80b585@...kaller.appspotmail.com>
Cc: linux-kernel@...r.kernel.org,
	syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [usb?] INFO: task hung in usb_port_suspend

On Fri, 11 Oct 2024 06:08:30 -0700
> syzbot found the following issue on:
> 
> HEAD commit:    4a9fe2a8ac53 dt-bindings: usb: dwc3-imx8mp: add compatible..
> git tree:       https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git usb-testing
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=1312c327980000

#syz test: https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git   v6.12-rc3

--- x/drivers/usb/gadget/udc/dummy_hcd.c
+++ y/drivers/usb/gadget/udc/dummy_hcd.c
@@ -1303,7 +1303,7 @@ static int dummy_urb_enqueue(
 		urb->error_count = 1;		/* mark as a new urb */
 
 	/* kick the scheduler, it'll do the rest */
-	if (!hrtimer_active(&dum_hcd->timer))
+	if (!hrtimer_is_queued(&dum_hcd->timer))
 		hrtimer_start(&dum_hcd->timer, ns_to_ktime(DUMMY_TIMER_INT_NSECS),
 				HRTIMER_MODE_REL_SOFT);
 
--