From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from relay.hostedemail.com (smtprelay0010.hostedemail.com [216.40.44.10]) (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 D5ADF43901C; Fri, 27 Feb 2026 15:20:16 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=216.40.44.10 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1772205618; cv=none; b=lbC18bwlodirxOOaoFCg+WCMlIxaj3FmHO6mkNrw4Tx9YLcW/kS9YHqmMcOhIUmzNenb7g5eIl99qvqXm3V9LQeMHZDCVjgwgwasuLXQ4nftv2BtRvixDIfkClAm1YVVQlpX0Xy2T33JaQ2xLRdT/I0WAuH5048tUsSCfAJSrJ8= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1772205618; c=relaxed/simple; bh=UuiGcMogUEujekOoWdyf/aYNw0UL7PWarR8ko8R02DU=; h=Date:From:To:Cc:Subject:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=VHAIBBQ5hAtvQFvvhz651P5dKKRL7cJKAwk1NHVC7Ptl3XU8VvYnFR4jPmoAjAmfVZou+r6lv+BOiLUln+DoWLUW442PgSgYVGDqtcqenC4WrR/qrD0DcGNZXWNKqSD/dtklLDxSjmUYhkxzHl/BYY7KdkOi7yo87wBuYa7L0HE= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=goodmis.org; spf=pass smtp.mailfrom=goodmis.org; arc=none smtp.client-ip=216.40.44.10 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=goodmis.org Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=goodmis.org Received: from omf08.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay08.hostedemail.com (Postfix) with ESMTP id 78C1114075B; Fri, 27 Feb 2026 15:20:15 +0000 (UTC) Received: from [HIDDEN] (Authenticated sender: rostedt@goodmis.org) by omf08.hostedemail.com (Postfix) with ESMTPA id 91A6620029; Fri, 27 Feb 2026 15:20:13 +0000 (UTC) Date: Fri, 27 Feb 2026 10:20:38 -0500 From: Steven Rostedt To: Vincent Donnefort Cc: Qing Wang , Masami Hiramatsu , Mathieu Desnoyers , linux-kernel@vger.kernel.org, linux-trace-kernel@vger.kernel.org, syzbot+3b5dd2030fe08afdf65d@syzkaller.appspotmail.com Subject: Re: [PATCH] tracing: Fix WARN_ON in tracing_buffers_mmap_close Message-ID: <20260227102038.0fef81e9@gandalf.local.home> In-Reply-To: References: <20260227025842.1085206-1-wangqing7171@gmail.com> X-Mailer: Claws Mail 3.20.0git84 (GTK+ 2.24.33; x86_64-pc-linux-gnu) Precedence: bulk X-Mailing-List: linux-trace-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit X-Rspamd-Server: rspamout05 X-Rspamd-Queue-Id: 91A6620029 X-Stat-Signature: 9k1uu49dj93j6krefafx3x699k4w33e4 X-Session-Marker: 726F737465647440676F6F646D69732E6F7267 X-Session-ID: U2FsdGVkX18y4lCsY6kr0eq/TTXyyUJPBBB1FhaXq0Q= X-HE-Tag: 1772205613-480801 X-HE-Meta: U2FsdGVkX18B8oFSfkMXJeQ543eyt9vcNzvLiapzUgMH2SOWqtb4KBgOA/KSSKZD7Y6bI1H/WakV+DTG2tR43Li4WhLpDGcNSsd6mqBXw69jsrVizzGpRN8mbhV9uglfDiX+f1XbbusfFppDMsL+O8SWpQLiuSC/4ptvSwegdPSiake7EETZrYvqPljY3QGFWHns/IjDJaNLCAdUPiYx7yed3cEQB4CE35O9zn1ECRqlAxXlvrTToC1OuHnY5jVlOGB8/s/mqJh3qsqXIymWRxN7lsmE3vKX1w/DBu+5ahUtO1OoA6+CZyHdISGwMi8gWXI6dAd0PRvXZroDGI+krrwdIoM/JDl3vc3xMgP/pAq8uwTHkfuD0w== On Fri, 27 Feb 2026 11:22:22 +0000 Vincent Donnefort wrote: > > Ah right, Syzkaller is using madvise(MADVISE_DOFORK) which resets VM_DONTCOPY. > > As we are applying restrictive rules for this mapping, I believe setting VM_IO > might be a better fix. Agreed. -- Steve