From: Vincent Donnefort <vdonnefort@google.com>
To: Steven Rostedt <rostedt@goodmis.org>
Cc: mhiramat@kernel.org, linux-trace-kernel@vger.kernel.org,
mathieu.desnoyers@efficios.com, kernel-team@android.com,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH v9 0/4] ring-buffer: Fixes for subbuf resizing and persistent buffers
Date: Thu, 3 Sep 2026 16:19:55 +0100 [thread overview]
Message-ID: <apmQGwDuvjSn0gzP@google.com> (raw)
In-Reply-To: <20260903103116.6cb7c39c@gandalf.local.home>
On Thu, Sep 03, 2026 at 10:31:16AM -0400, Steven Rostedt wrote:
> On Tue, 1 Sep 2026 16:54:41 +0100
> Vincent Donnefort <vdonnefort@google.com> wrote:
>
> > This series addresses multiple issues discovered with the dynamic ring
> > buffer resizing.
> >
> > I have managed to reproduce a ring_buffer_read_page() race with
> >
> > $ while true; do for i in 8 16 32; do echo $i > /sys/kernel/tracing/buffer_subbuf_size_kb; sleep 0.1; done; done
>
> Did you do anything else while running the above?
>
> I ask because I ran this for several hours and it didn't produce anything.
> What bug does it supposed to trigger?
>
> -- Steve
I clearly have been imprecise here.
I had "trace-record -e sched" and I have just verified with a print that it has
run into the reader->order != read_page->order case.
--
Vincent
prev parent reply other threads:[~2026-09-03 15:20 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-09-01 15:54 [PATCH v9 0/4] ring-buffer: Fixes for subbuf resizing and persistent buffers Vincent Donnefort
2026-09-01 15:54 ` [PATCH v9 1/4] ring-buffer: Allow splice reads on static buffers Vincent Donnefort
2026-09-03 18:26 ` Steven Rostedt
2026-09-01 15:54 ` [PATCH v9 2/4] tracing: Fix subbuf resize races with trace_pipe_raw readers Vincent Donnefort
2026-09-03 15:48 ` Steven Rostedt
2026-09-03 17:27 ` Vincent Donnefort
2026-09-01 15:54 ` [PATCH v9 3/4] ring-buffer: Cap static ring buffer nr_pages Vincent Donnefort
2026-09-01 16:35 ` sashiko-bot
2026-09-03 16:56 ` Steven Rostedt
2026-09-03 17:06 ` Vincent Donnefort
2026-09-03 17:33 ` Steven Rostedt
2026-09-04 13:04 ` Vincent Donnefort
2026-09-04 14:02 ` Steven Rostedt
2026-09-01 15:54 ` [PATCH v9 4/4] ring-buffer: Prevent truncation of nr_pages / nr_subbufs Vincent Donnefort
2026-09-01 16:48 ` sashiko-bot
2026-09-03 17:23 ` Steven Rostedt
2026-09-03 17:16 ` Steven Rostedt
2026-09-03 17:37 ` Vincent Donnefort
2026-09-03 18:17 ` Steven Rostedt
2026-09-03 14:31 ` [PATCH v9 0/4] ring-buffer: Fixes for subbuf resizing and persistent buffers Steven Rostedt
2026-09-03 15:19 ` Vincent Donnefort [this message]
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