Re: [PATCH v3] eventpoll: Fix priority inversion problem

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To: Nam Cao <namcao@xxxxxxxxxxxxx>
Subject: Re: [PATCH v3] eventpoll: Fix priority inversion problem
From: Yann Ylavic <ylavic.dev@xxxxxxxxx>
Date: Tue, 15 Jul 2025 11:37:05 +0200
Cc: Christian Brauner <brauner@xxxxxxxxxx>, Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>, Xi Ruoyao <xry111@xxxxxxxxxxx>, Frederic Weisbecker <frederic@xxxxxxxxxx>, Valentin Schneider <vschneid@xxxxxxxxxx>, Alexander Viro <viro@xxxxxxxxxxxxxxxxxx>, Jan Kara <jack@xxxxxxx>, Sebastian Andrzej Siewior <bigeasy@xxxxxxxxxxxxx>, John Ogness <john.ogness@xxxxxxxxxxxxx>, Clark Williams <clrkwllms@xxxxxxxxxx>, Steven Rostedt <rostedt@xxxxxxxxxxx>, linux-fsdevel@xxxxxxxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx, linux-rt-devel@xxxxxxxxxxxxxxx, linux-rt-users@xxxxxxxxxxxxxxx, Joe Damato <jdamato@xxxxxxxxxx>, Martin Karsten <mkarsten@xxxxxxxxxxxx>, Jens Axboe <axboe@xxxxxxxxx>
In-reply-to: <20250714101410.Su0CwBrb@linutronix.de>

On Mon, Jul 14, 2025 at 9:48 PM Nam Cao <namcao@xxxxxxxxxxxxx> wrote:
>
> And my lesson is that lockless is hard. I still have no clue what is the
> bug in this patch.

Maybe this is related:
https://lore.kernel.org/all/20250704180804.3598503-1-shakeel.butt@xxxxxxxxx/
?


Regards;
Yann.

Follow-Ups:
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References:
- Re: [PATCH v3] eventpoll: Fix priority inversion problem
  - From: Nam Cao
- Re: [PATCH v3] eventpoll: Fix priority inversion problem
  - From: Xi Ruoyao
- Re: [PATCH v3] eventpoll: Fix priority inversion problem
  - From: Nam Cao
- Re: [PATCH v3] eventpoll: Fix priority inversion problem
  - From: Xi Ruoyao
- Re: [PATCH v3] eventpoll: Fix priority inversion problem
  - From: Nam Cao
- Re: [PATCH v3] eventpoll: Fix priority inversion problem
  - From: Xi Ruoyao
- Re: [PATCH v3] eventpoll: Fix priority inversion problem
  - From: Nam Cao
- Re: [PATCH v3] eventpoll: Fix priority inversion problem
  - From: Christian Brauner
- Re: [PATCH v3] eventpoll: Fix priority inversion problem
  - From: Nam Cao
- Re: [PATCH v3] eventpoll: Fix priority inversion problem
  - From: Christian Brauner
- Re: [PATCH v3] eventpoll: Fix priority inversion problem
  - From: Nam Cao

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