From: Takashi Iwai <tiwai@suse.de>
To: Nam Cao <namcao@linutronix.de>
Cc: Harshit Mogalapalli <harshit.m.mogalapalli@oracle.com>,
jayalk@intworks.biz, Daniel Vetter <daniel@ffwll.ch>,
deller@gmx.de, linux-fbdev@vger.kernel.org,
dri-devel@lists.freedesktop.org, tiwai@suse.de,
bigeasy@linutronix.de, patrik.r.jakobsson@gmail.com,
LKML <linux-kernel@vger.kernel.org>,
Vegard Nossum <vegard.nossum@oracle.com>,
George Kennedy <george.kennedy@oracle.com>,
Darren Kenny <darren.kenny@oracle.com>,
chuansheng.liu@intel.com
Subject: Re: [bug-report] task info hung problem in fb_deferred_io_work()
Date: Thu, 18 Apr 2024 16:26:22 +0200 [thread overview]
Message-ID: <87ttjywxv5.wl-tiwai@suse.de> (raw)
In-Reply-To: <20240418160652.68df1a86@namcao>
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
next prev parent reply other threads:[~2024-04-18 14:26 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-04-18 12:39 [bug-report] task info hung problem in fb_deferred_io_work() Harshit Mogalapalli
2024-04-18 13:14 ` Patrik Jakobsson
2024-04-18 14:05 ` Nam Cao
2024-04-18 14:34 ` Patrik Jakobsson
2024-04-19 15:18 ` Nam Cao
2024-04-19 7:27 ` Harshit Mogalapalli
2024-04-18 14:06 ` Nam Cao
2024-04-18 14:26 ` Takashi Iwai [this message]
2024-04-18 19:29 ` Helge Deller
2024-04-19 6:44 ` Takashi Iwai
2024-04-19 7:39 ` Harshit Mogalapalli
2024-04-19 7:45 ` Takashi Iwai
2024-04-19 7:50 ` Patrik Jakobsson
2024-04-19 15:34 ` Nam Cao
2024-04-30 11:45 ` Patrik Jakobsson
2024-04-19 14:42 ` Harshit Mogalapalli
2024-04-19 7:35 ` Harshit Mogalapalli
2024-04-19 14:59 ` Nam Cao
2024-04-19 16:05 ` Harshit Mogalapalli
2024-04-19 16:23 ` Nam Cao
2024-04-19 16:39 ` Harshit Mogalapalli
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