From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id B49893F5BD9; Tue, 7 Jul 2026 13:46:20 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1783431981; cv=none; b=obUtlKnjn0v5Zx0CmbgR0HxeoH9nMuZZb9OM9zZwepYIu0mvffdJZDwoQf/7v4TEmP3LjLnSJDXL1NYFY0Q1Tl2jMA3774XwZbnT5uo4fJ39Mg+DnAm/lLjHVIQdh5hZGI4cqCa0KhcTFq5YeKtjeU/5Nt3Y7v8rHZZSRSy0o1A= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1783431981; c=relaxed/simple; bh=n4V1rpg5qgR5wxE4ngAQqDukPMurhhkQ7linxXM409Q=; h=Message-ID:Date:From:To:Cc:Subject:References:MIME-Version: Content-Type; b=Zruq9pp62fio/XbgsLBLZgZSXgKpC7xxDOhxeJOy0rytrcUz6uoi+vBCVFcQP7NbI8FCc3PeUGw7RgXdPQuGZBuPTwys8vE3xcuce4wRKXKZw2TquaiLNCi0nrc/NNBqipoNY6TNZK3zQCD3qlNMF7ZOs+gXBlyRw6JFpSgWVVI= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=go9yYE2z; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="go9yYE2z" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 680FD1F00ACA; Tue, 7 Jul 2026 13:46:20 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1783431980; bh=UcvyJXf5sN+q6Zk271pSdqPHJlaxLnJNBCDOccXHyTg=; h=Date:From:To:Cc:Subject:References; b=go9yYE2z3Ic4D0IXgSgYDlBMqsUppSGhK++W1ybZVqILic03k38JCxp/26skgTtWA uVdpeHQdDTIQrFB6nAV7DWpjfQmh1b6m37EHIm6BT1/q2IA8QrkHr2+D7yHesQSPsf x0faM1F+VsK90gAeK9zlqjn8k0pnZlRG+zUqhdwyaFhv3zO7Ac+diNnZYykdA3yffY VZdamKelSVN6pe54oWv7arXVjtj5yPdpSK4l6m4iPlkimgwJd6Cp0gvwr/FV1Ya0FA donNxJufm0EkgXK/Uwb8uPq0DKDkDEf2vNtzkkRgo7Gfins3c8Q3MzG5Pych3z5DXw nv8XHBIHSrz5w== Received: from rostedt by gandalf with local (Exim 4.99.4) (envelope-from ) id 1wh67z-00000000h26-2xqo; Tue, 07 Jul 2026 09:46:23 -0400 Message-ID: <20260707134623.554037981@kernel.org> User-Agent: quilt/0.69 Date: Tue, 07 Jul 2026 09:46:07 -0400 From: Steven Rostedt To: linux-kernel@vger.kernel.org Cc: Masami Hiramatsu , Mark Rutland , Mathieu Desnoyers , Andrew Morton , stable@vger.kernel.org, Crystal Wood Subject: [for-linus][PATCH 03/13] tracing/osnoise: Call synchronize_rcu() when unregistering References: <20260707134604.275787924@kernel.org> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 From: Crystal Wood This ensures that any RCU readers traversing the instance list have finished, before releasing the reference on the tracer that the instance points to. Cc: stable@vger.kernel.org Fixes: a6ed2aee54644 ("tracing: Switch to kvfree_rcu() API") Link: https://patch.msgid.link/20260609045430.1589786-1-crwood@redhat.com Suggested-by: Steven Rostedt Signed-off-by: Crystal Wood Signed-off-by: Steven Rostedt --- kernel/trace/trace_osnoise.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/kernel/trace/trace_osnoise.c b/kernel/trace/trace_osnoise.c index 5e83c4f6f2b4..0e1265acd1cc 100644 --- a/kernel/trace/trace_osnoise.c +++ b/kernel/trace/trace_osnoise.c @@ -179,7 +179,9 @@ static void osnoise_unregister_instance(struct trace_array *tr) if (!found) return; - kvfree_rcu_mightsleep(inst); + /* Do a full sync to ensure that tr remains valid, not just inst */ + synchronize_rcu(); + kvfree(inst); } /* -- 2.53.0