linux-kernel - Re: Linux 4.2-rc1

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: <559E7AA4.6020602@osg.samsung.com>
Date:	Thu, 09 Jul 2015 07:44:04 -0600
From:	Shuah Khan <shuahkh@....samsung.com>
To:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Ming Lei <ming.lei@...onical.com>
CC:	Shuah Khan <shuahkhan@...il.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Shuah Khan <shuahkh@....samsung.com>
Subject: Re: Linux 4.2-rc1

On 07/09/2015 07:10 AM, Shuah Khan wrote:
> On 07/08/2015 09:17 PM, Linus Torvalds wrote:
>> On Wed, Jul 8, 2015 at 5:58 PM, Ming Lei <ming.lei@...onical.com> wrote:
>>> On Thu, Jul 9, 2015 at 1:29 AM, Linus Torvalds
>>> <torvalds@...ux-foundation.org> wrote:
>>>> Also, it looks like you need to hold the "fw_lock" to even look at
>>>> that pointer, since the buffer can get reallocated etc.
>>>
>>> Yes, the above code with holding 'fw_lock' is right fix for the issue since
>>> sysfs read can happen anytime, and there is one race between firmware
>>> request abort and reading uevent of sysfs.
>>
>> So if fw_priv->buf is NULL, what should we do?
>>
>> Should we skip the TIMEOUT= and ASYNC= fields too?
>>
>> Something like the attached, perhaps?
>>
>> Shuah, how reproducible is this? Does this (completely untested) patch
>> make any difference?
>>
> 
> Happened both times I booted 4.2-rc1 up, so I would say 100% so far.
> I will test with your patch and report results.
> 

Yes. This patch fixed the problem. I have been seeing another problem
that both poweroff and reboot hang. I will get more data on this later
on today.

thanks,
-- Shuah
-- 
Shuah Khan
Sr. Linux Kernel Developer
Open Source Innovation Group
Samsung Research America (Silicon Valley)
shuahkh@....samsung.com | (970) 217-8978
--
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/