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

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Message-ID: <d65e2258-2901-486a-ab83-ff57e9868a91@rowland.harvard.edu>
Date: Fri, 11 Oct 2024 10:08:19 -0400
From: Alan Stern <stern@...land.harvard.edu>
To: syzbot <syzbot+f342ea16c9d06d80b585@...kaller.appspotmail.com>
Cc: Marcello Sylvester Bauer <sylv@...v.io>, gregkh@...uxfoundation.org,
	linux-kernel@...r.kernel.org, linux-usb@...r.kernel.org,
	syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [usb?] INFO: task hung in usb_port_suspend

On Fri, Oct 11, 2024 at 06:08:30AM -0700, syzbot wrote:
> Hello,
> 
> 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
> console output: https://syzkaller.appspot.com/x/log.txt?x=17d067d0580000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=4510af5d637450fb
> dashboard link: https://syzkaller.appspot.com/bug?extid=f342ea16c9d06d80b585
> compiler:       gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=1312c327980000
> 
> Downloadable assets:
> disk image: https://storage.googleapis.com/syzbot-assets/883c5319cb52/disk-4a9fe2a8.raw.xz
> vmlinux: https://storage.googleapis.com/syzbot-assets/caf4421ed2ef/vmlinux-4a9fe2a8.xz
> kernel image: https://storage.googleapis.com/syzbot-assets/d8e3beb01d49/bzImage-4a9fe2a8.xz
> 
> IMPORTANT: if you fix the issue, please add the following tag to the commit:
> Reported-by: syzbot+f342ea16c9d06d80b585@...kaller.appspotmail.com
> 
> INFO: task kworker/1:0:24 blocked for more than 143 seconds.
>       Not tainted 6.12.0-rc1-syzkaller-00027-g4a9fe2a8ac53 #0
> "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
> task:kworker/1:0     state:D stack:23808 pid:24    tgid:24    ppid:2      flags:0x00004000
> Workqueue: pm pm_runtime_work

Let's try to verify that this problem really was caused by the timer 
changes to dummy-hcd.  The following commit is the one preceding those 
changes.

#syz test: https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git 920e7522e3ba

Alan Stern