From: Sasha Levin <sashal@kernel.org>
To: gregkh@linuxfoundation.org, keno@juliacomputing.com,
keno@juliahub.com, mingo@kernel.org
Cc: Sasha Levin <sashal@kernel.org>,
stable@vger.kernel.org, Thomas Gleixner <tglx@kernel.org>
Subject: Re: [PATCH 7.1.y, 6.18.y, 6.12.y] futex: Prevent robust futex exit race some more
Date: Fri, 14 Aug 2026 22:33:16 -0400 [thread overview]
Message-ID: <20260814193000.16@kernel.org> (raw)
In-Reply-To: <877blsna8f.ffs@fw13>
> commit 6d4514ca9cdf61fec4ec634cf50386f6f7e69748 upstream.
>
> A robust futex unlock stores 0 over the whole futex value - wiping
> FUTEX_WAITERS - and wakes a single waiter. That wakeup is a one-shot
> notification: the protocol relies on its recipient to either acquire the
> futex (and eventually unlock while aware of the remaining contention) or
> re-arm FUTEX_WAITERS before sleeping again.
Queued for all the active stable trees (7.1 down to 5.10), thanks. The older
ones needed futex_wake()'s signature adapted; the logic is unchanged.
--
Thanks,
Sasha
next prev parent reply other threads:[~2026-08-15 2:33 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-08-13 0:52 FAILED: patch "[PATCH] futex: Prevent robust futex exit race some more" failed to apply to 7.1-stable tree gregkh
2026-08-14 12:43 ` [PATCH 7.1.y, 6.18.y, 6.12.y] futex: Prevent robust futex exit race some more Thomas Gleixner
2026-08-15 2:33 ` Sasha Levin [this message]
2026-08-15 14:34 ` Thomas Gleixner
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