linux-kernel - Re: [bug-report] task info hung problem in fb_deferred_io

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Date: Thu, 18 Apr 2024 16:26:22 +0200
From: Takashi Iwai <tiwai@...e.de>
To: Nam Cao <namcao@...utronix.de>
Cc: Harshit Mogalapalli <harshit.m.mogalapalli@...cle.com>,
	jayalk@...works.biz,
	Daniel Vetter <daniel@...ll.ch>,
	deller@....de,
	linux-fbdev@...r.kernel.org,
	dri-devel@...ts.freedesktop.org,
	tiwai@...e.de,
	bigeasy@...utronix.de,
	patrik.r.jakobsson@...il.com,
	LKML
 <linux-kernel@...r.kernel.org>,
	Vegard Nossum <vegard.nossum@...cle.com>,
	George Kennedy <george.kennedy@...cle.com>,
	Darren Kenny
 <darren.kenny@...cle.com>,
	chuansheng.liu@...el.com
Subject: Re: [bug-report] task info hung problem in fb_deferred_io_work()

On Thu, 18 Apr 2024 16:06:52 +0200,
Nam Cao wrote:
> 
> On 2024-04-18 Harshit Mogalapalli wrote:
> > While fuzzing 5.15.y kernel with Syzkaller, we noticed a INFO: task hung 
> > bug in fb_deferred_io_work()
> 
> Which framebuffer device are you using exactly? It is possible that
> the problem is with the device driver, not core framebuffer.

Note that it was already known that using flush_delayed_work() caused
a problem.  See the thread of the fix patch:
  https://lore.kernel.org/all/20230129082856.22113-1-tiwai@suse.de/

BTW, the problem is seen with bochs drm.


Takashi