linux-kernel - Re: [syzbot] [usb?] BUG: sleeping function called from invalid context in dummy

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Message-ID: <20250825102648.5395-1-hdanton@sina.com>
Date: Mon, 25 Aug 2025 18:26:46 +0800
From: Hillf Danton <hdanton@...a.com>
To: syzbot <syzbot+8baacc4139f12fa77909@...kaller.appspotmail.com>
Cc: linux-kernel@...r.kernel.org,
	syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [usb?] BUG: sleeping function called from invalid context in dummy_dequeue

> Date: Mon, 25 Aug 2025 01:51:29 -0700	[thread overview]
> Hello,
> 
> syzbot found the following issue on:
> 
> HEAD commit:    8d245acc1e88 Merge tag 'char-misc-6.17-rc3' of git://git.k..
> git tree:       upstream
> console output: https://syzkaller.appspot.com/x/log.txt?x=11e42062580000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=e1e1566c7726877e
> dashboard link: https://syzkaller.appspot.com/bug?extid=8baacc4139f12fa77909
> compiler:       Debian clang version 20.1.7 (++20250616065708+6146a88f6049-1~exp1~20250616065826.132), Debian LLD 20.1.7
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=13317062580000
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=14d5ea34580000

#syz test

--- x/drivers/usb/gadget/udc/dummy_hcd.c
+++ y/drivers/usb/gadget/udc/dummy_hcd.c
@@ -765,8 +765,7 @@ static int dummy_dequeue(struct usb_ep *
 	if (!dum->driver)
 		return -ESHUTDOWN;
 
-	local_irq_save(flags);
-	spin_lock(&dum->lock);
+	spin_lock_irqsave(&dum->lock, flags);
 	list_for_each_entry(iter, &ep->queue, queue) {
 		if (&iter->req != _req)
 			continue;
--