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From: John Stultz <jstultz@google.com>
To: LKML <linux-kernel@vger.kernel.org>
Cc: John Stultz <jstultz@google.com>,
	Vineeth Pillai <vineethrp@google.com>,
	 Sonam Sanju <sonam.sanju@intel.com>,
	Sean Christopherson <seanjc@google.com>,
	 Kunwu Chan <kunwu.chan@linux.dev>, Tejun Heo <tj@kernel.org>,
	 Joel Fernandes <joelagnelf@nvidia.com>,
	Qais Yousef <qyousef@layalina.io>,
	 Ingo Molnar <mingo@redhat.com>,
	Peter Zijlstra <peterz@infradead.org>,
	 Juri Lelli <juri.lelli@redhat.com>,
	Vincent Guittot <vincent.guittot@linaro.org>,
	 Dietmar Eggemann <dietmar.eggemann@arm.com>,
	Valentin Schneider <vschneid@redhat.com>,
	 Steven Rostedt <rostedt@goodmis.org>,
	Will Deacon <will@kernel.org>, Waiman Long <longman@redhat.com>,
	 Boqun Feng <boqun.feng@gmail.com>,
	"Paul E. McKenney" <paulmck@kernel.org>,
	 Metin Kaya <Metin.Kaya@arm.com>,
	Xuewen Yan <xuewen.yan94@gmail.com>,
	 K Prateek Nayak <kprateek.nayak@amd.com>,
	Thomas Gleixner <tglx@linutronix.de>,
	 Daniel Lezcano <daniel.lezcano@linaro.org>,
	Suleiman Souhlal <suleiman@google.com>,
	 kuyo chang <kuyo.chang@mediatek.com>, hupu <hupu.gm@gmail.com>,
	kernel-team@android.com
Subject: [PATCH 0/2] Proxy Execution fixes for v7.1-rc
Date: Mon, 27 Apr 2026 18:38:39 +0000	[thread overview]
Message-ID: <20260427183848.698551-1-jstultz@google.com> (raw)

Hey All,
  So in testing with the full Proxy Execution series,
Vineeth Pillai managed to trip some interesting bugs which
initially looked to be KVM or RCU related[1], which he later
diagnosed as Proxy Execution related and created a useful test
driver to reproduce.

I found these same issues could be triggered with the upstream
portions of Proxy Execution, so I wanted to send along these
fixes for 7.1-rc

Again, a huge thanks to Vineeth for uncovering these issues
that have evaded all my stress testing so far!

Thanks
-john

[1]: https://lore.kernel.org/lkml/20260320125633.2290675-1-vineeth@bitbyteword.org/

Cc: Vineeth Pillai <vineethrp@google.com>
Cc: Sonam Sanju <sonam.sanju@intel.com>
Cc: Sean Christopherson <seanjc@google.com>
Cc: Kunwu Chan <kunwu.chan@linux.dev>
Cc: Tejun Heo <tj@kernel.org>
Cc: Joel Fernandes <joelagnelf@nvidia.com>
Cc: Qais Yousef <qyousef@layalina.io>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Juri Lelli <juri.lelli@redhat.com>
Cc: Vincent Guittot <vincent.guittot@linaro.org>
Cc: Dietmar Eggemann <dietmar.eggemann@arm.com>
Cc: Valentin Schneider <vschneid@redhat.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Will Deacon <will@kernel.org>
Cc: Waiman Long <longman@redhat.com>
Cc: Boqun Feng <boqun.feng@gmail.com>
Cc: "Paul E. McKenney" <paulmck@kernel.org>
Cc: Metin Kaya <Metin.Kaya@arm.com>
Cc: Xuewen Yan <xuewen.yan94@gmail.com>
Cc: K Prateek Nayak <kprateek.nayak@amd.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Daniel Lezcano <daniel.lezcano@linaro.org>
Cc: Suleiman Souhlal <suleiman@google.com>
Cc: kuyo chang <kuyo.chang@mediatek.com>
Cc: hupu <hupu.gm@gmail.com>
Cc: kernel-team@android.com

John Stultz (2):
  sched: proxy-exec: Close race causing workqueue work being delayed
  locking: mutex: Fix proxy-exec potentially deactivating tasks marked
    TASK_RUNNING

 kernel/locking/mutex.c |  1 +
 kernel/sched/core.c    | 11 +++++++++++
 2 files changed, 12 insertions(+)

-- 
2.54.0.545.g6539524ca2-goog


             reply	other threads:[~2026-04-27 18:38 UTC|newest]

Thread overview: 11+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2026-04-27 18:38 John Stultz [this message]
2026-04-27 18:38 ` [PATCH 1/2] sched: proxy-exec: Close race causing workqueue work being delayed John Stultz
2026-04-28  8:06   ` K Prateek Nayak
2026-04-28  9:43   ` Peter Zijlstra
2026-04-28 11:18     ` Peter Zijlstra
2026-04-28 13:15       ` K Prateek Nayak
2026-04-28 14:12         ` K Prateek Nayak
2026-04-28 16:50         ` Peter Zijlstra
2026-04-27 18:38 ` [PATCH 2/2] locking: mutex: Fix proxy-exec potentially deactivating tasks marked TASK_RUNNING John Stultz
2026-04-28  8:16   ` K Prateek Nayak
2026-04-28 19:50     ` John Stultz

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