linux-kernel - Re: Success: tty_io flush_to_ldisc() error message triggered

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <44C22FFA.9050704@microgate.com>
Date:	Sat, 22 Jul 2006 09:02:34 -0500
From:	Paul Fulghum <paulkf@...rogate.com>
To:	Chuck Ebbert <76306.1226@...puserve.com>
CC:	linux-kernel <linux-kernel@...r.kernel.org>,
	Alan Cox <alan@...rguk.ukuu.org.uk>
Subject: Re: Success: tty_io flush_to_ldisc() error message triggered

Chuck Ebbert wrote:
> Using the patch below that you sent me, this message printed today on
> my SMP system when terminating pppd:
> 
>         flush_to_ldisc - TTY_FLUSHING set, low_latency=0
> 
> And this bug is also in 2.6.17.4 - I forgot to reboot into 2.6.16.x
> and the system locked up the same way 2.6.16 used to.  That was made
> even more fun by the 'SysRq broken on SMP' bug fixed by a pending
> 2.6.17.7 patch...

That confirms my thoughts on what went wrong:
multiple copies of the queued work (flush_to_ldisc)
running in parallel and corrupting the free buffer list.

A cleaner fix for this is already
in the 2.6.18 rc series.

Thanks,
Paul

--
Paul Fulghum
Microgate Systems, Ltd.


-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/