linux-kernel - Re: [syzbot] [kernel?] KASAN: slab-use-after-free Read in kill_orphaned

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Date: Sun, 12 May 2024 07:34:04 +0800
From: Hillf Danton <hdanton@...a.com>
To: lee bruce <xrivendell7@...il.com>
Cc: syzbot+68619f9e9e69accd8e0a@...kaller.appspotmail.com,
	linux-kernel@...r.kernel.org,
	syzkaller-bugs@...glegroups.com,
	Edward Adam Davis <eadavis@...com>,
	clf700383@...il.com,
	michael.christie@...cle.com,
	mst@...hat.com
Subject: Re: [syzbot] [kernel?] KASAN: slab-use-after-free Read in kill_orphaned_pgrp (2)

On Sat, 11 May 2024 22:45:06 +0800 lee bruce <xrivendell7@...il.com>
> Hello, I found a reproducer for this bug.
> 
Thanks for your report.

> If you fix this issue, please add the following tag to the commit:
> Reported-by: xingwei lee <xrivendell7@...il.com>
> Reported-by: lingfei cheng <clf700383@...il.com>
> 
> I use the same kernel as syzbot instance
> Kernel Commit: upstream dccb07f2914cdab2ac3a5b6c98406f765acab803
> Kernel Config: https://syzkaller.appspot.com/text?tag=3DKernelConfig&x=3D6d14c12b661fb43
> with KASAN enabled
> 
> Since the same title bug is triggered in
> https://syzkaller.appspot.com/bug?id=3D70492b96ff47ff70cfc433be100586119310670b.
> I make a simple RCA.
> In the old-syzbot instance the bug still trigger the title "KASAN:
> slab-use-after-free Read in kill_orphaned_pgrp=E2=80=9D and in the lastest
> syzbot the bug report as
> 
> TITLE: WARNING in signal_wake_up_state
> ------------[ cut here ]------------
> WARNING: CPU: 3 PID: 8591 at kernel/signal.c:762
> signal_wake_up_state+0xf8/0x130 kernel/signal.c:762
> Modules linked in:
> CPU: 3 PID: 8591 Comm: file0 Not tainted 6.9.0-rc7-00012-gdccb07f2914c #6

Could you reproduce it in the next tree, because of d558664602d3 ("vhost_task:
Handle SIGKILL by flushing work and exiting") adding reaction to signal?