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

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Message-ID: <b1657fab-b34f-4f52-94e7-333577cdb450@rowland.harvard.edu>
Date: Thu, 3 Jul 2025 17:27:39 -0400
From: Alan Stern <stern@...land.harvard.edu>
To: Tetsuo Handa <penguin-kernel@...ove.sakura.ne.jp>
Cc: Hillf Danton <hdanton@...a.com>, Mark Brown <broonie@...nel.org>,
	Mathias Nyman <mathias.nyman@...ux.intel.com>,
	Konrad Dybcio <konrad.dybcio@....qualcomm.com>,
	syzbot <syzbot+d630bd89141124cc543e@...kaller.appspotmail.com>,
	gregkh@...uxfoundation.org, linux-kernel@...r.kernel.org,
	Boqun Feng <boqun.feng@...il.com>, linux-usb@...r.kernel.org,
	syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [usb?] INFO: task hung in hub_activate (3)

On Thu, Jul 03, 2025 at 10:48:56AM +0900, Tetsuo Handa wrote:
> On 2025/07/03 10:20, Tetsuo Handa wrote:
> > Caused by commit 9bd9c8026341 ("usb: hub: Fix flushing of delayed work
> > used for post resume purposes") with cc: stable.
> > Shouldn't we revert that commit and seek for a different approach
> > than wait for a reproducer?
> > 
> 
> Sorry, wrong commit.
> 
> The line was added by commit a49e1e2e785f ("usb: hub: Fix flushing and
> scheduling of delayed work that tunes runtime pm") with cc: stable.

Mathias has posted a fix for this problem:

https://lore.kernel.org/linux-usb/20250627164348.3982628-2-mathias.nyman@linux.intel.com/

It hasn't gotten into Linus's tree yet.

Alan Stern