Re: [PATCH v9 0/4] ring-buffer: Fixes for subbuf resizing and persistent buffers

On Thu, Sep 03, 2026 at 10:31:16AM -0400, Steven Rostedt wrote:

On Tue,  1 Sep 2026 16:54:41 +0100
Vincent Donnefort [off-list ref] wrote:

quoted

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