linux-kernel - Re: [patch] futex: Cure exit race

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Message-ID: <20181210230142.GG97256@sasha-vm>
Date:   Mon, 10 Dec 2018 18:01:42 -0500
From:   Sasha Levin <sashal@...nel.org>
To:     Thomas Gleixner <tglx@...utronix.de>
Cc:     LKML <linux-kernel@...r.kernel.org>, stable@...r.kernel.org
Subject: Re: [patch] futex: Cure exit race

On Mon, Dec 10, 2018 at 10:16:03PM +0100, Thomas Gleixner wrote:
>On Mon, 10 Dec 2018, Sasha Levin wrote:
>> This commit has been processed because it contains a -stable tag.
>> The stable tag indicates that it's relevant for the following trees: all
>>
>> The bot has tested the following trees: v4.19.8, v4.14.87, v4.9.144, v4.4.166, v3.18.128,
>>
>> v4.19.8: Build OK!
>> v4.14.87: Build OK!
>> v4.9.144: Build failed! Errors:
>>     kernel/futex.c:1186:28: error: ???uaddr??? undeclared (first use in this function)
>>
>> v4.4.166: Build failed! Errors:
>>     kernel/futex.c:1181:28: error: ???uaddr??? undeclared (first use in this function)
>>
>> v3.18.128: Build failed! Errors:
>>     kernel/futex.c:1103:28: error: ???uaddr??? undeclared (first use in this function)
>>
>> How should we proceed with this patch?
>
>I'll look into that once this is sorted... I so love these rotten kernels.

It seems we need:

	734009e96d19 ("futex: Change locking rules")

Which isn't trivial to backport.

--
Thanks,
Sasha