linux-kernel - Re: [PATCH 1/1] TTY: fix PTY hangup vs close race

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Date:	Mon, 20 Feb 2012 12:15:31 +0100
From:	Jiri Slaby <jslaby@...e.cz>
To:	Sasha Levin <levinsasha928@...il.com>
CC:	Jiri Slaby <jirislaby@...il.com>, gregkh@...uxfoundation.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/1] TTY: fix PTY hangup vs close race

On 02/20/2012 11:20 AM, Sasha Levin wrote:
>> [*] Your dump reveals that the code fetches tty->driver_data (mov
>> 0x428(%rdi),%rbx) and traps at a fetch of inode->i_sbm because inode is
>> NULL (mov    0x28(%rbx),%rax).
> 
> It actually looks even more complex than that. I reverted the patch
> above, but still got the error. A quick bisection pointed me to
> a50f724a432997321cabb6c9e665c28e34850f78.

> Looks like reverting both actually solves the problem. Reverting just
> one of them doesn't.

Ah, I see. I suppose you have CONFIG_LEGACY_PTYS=y. I somehow overlooked
that case.

So both of them should be reverted in upstream:
d3bda5298aad98c7a27678bdd0dd9d008ab9e685
a50f724a432997321cabb6c9e665c28e34850f78

thanks,
-- 
js
suse labs
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