linux-kernel - Re: [syzbot] [input?] [usb?] [mm?] INFO: rcu detected stall in vma_link

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Message-ID: <2024101602-skintight-crawfish-ebab@gregkh>
Date: Wed, 16 Oct 2024 09:14:27 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: Lorenzo Stoakes <lorenzo.stoakes@...cle.com>
Cc: syzbot <syzbot+ce483fd06e2061f44f5d@...kaller.appspotmail.com>,
	akpm@...ux-foundation.org, liam.howlett@...cle.com,
	linux-input@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org, linux-usb@...r.kernel.org,
	syzkaller-bugs@...glegroups.com, vbabka@...e.cz,
	Marcello Sylvester Bauer <sylv@...v.io>,
	Jiri Kosina <jikos@...nel.org>,
	Benjamin Tissoires <bentiss@...nel.org>
Subject: Re: [syzbot] [input?] [usb?] [mm?] INFO: rcu detected stall in
 vma_link_file

On Wed, Oct 16, 2024 at 08:06:20AM +0100, Lorenzo Stoakes wrote:
> + some people from USB/HID subsystem.
> 
> This is really not looking mm-related, as for a second time we've asked
> syzbot to re-run and for a second time it's not hit any mm-specific code -
> I think this is misattributed - could somebody from the USB/HID side take a
> look?
> 
> It looks to be something that isn't reproduced by a specific C program but
> by a syzkaller USB configuration [0]?

There's a lot of odd usb syzbot issues right now dealing with the dummy
hcd controller, so maybe this is another one of them...

thanks,

greg k-h