[bug-report] task info hung problem in fb_deferred_io_work()

[Takashi Iwai]

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