From: Steven Rostedt <rostedt@xxxxxxxxxxx> commit 9ba0e1755a40f9920ad0f4168031291b3eb58d7b upstream. Memory mapping the tracing ring buffer will disable resizing the buffer. But if there's an error in the memory mapping like an invalid parameter, the function exits out without re-enabling the resizing of the ring buffer, preventing the ring buffer from being resized after that. Cc: stable@xxxxxxxxxxxxxxx Cc: Masami Hiramatsu <mhiramat@xxxxxxxxxx> Cc: Mathieu Desnoyers <mathieu.desnoyers@xxxxxxxxxxxx> Cc: Vincent Donnefort <vdonnefort@xxxxxxxxxx> Link: https://lore.kernel.org/20250213131957.530ec3c5@xxxxxxxxxxxxxxxxxx Fixes: 117c39200d9d7 ("ring-buffer: Introducing ring-buffer mapping functions") Signed-off-by: Steven Rostedt (Google) <rostedt@xxxxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- kernel/trace/ring_buffer.c | 1 + 1 file changed, 1 insertion(+) --- a/kernel/trace/ring_buffer.c +++ b/kernel/trace/ring_buffer.c @@ -7157,6 +7157,7 @@ int ring_buffer_map(struct trace_buffer kfree(cpu_buffer->subbuf_ids); cpu_buffer->subbuf_ids = NULL; rb_free_meta_page(cpu_buffer); + atomic_dec(&cpu_buffer->resize_disabled); } unlock: Patches currently in stable-queue which might be from rostedt@xxxxxxxxxxx are queue-6.12/ring-buffer-update-pages_touched-to-reflect-persistent-buffer-content.patch queue-6.12/ring-buffer-unlock-resize-on-mmap-error.patch queue-6.12/rtla-timerlat_hist-abort-event-processing-on-second-.patch queue-6.12/rtla-timerlat_top-abort-event-processing-on-second-s.patch queue-6.12/tracing-do-not-allow-mmap-of-persistent-ring-buffer.patch queue-6.12/ring-buffer-validate-the-persistent-meta-data-subbuf-array.patch
