From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-5.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, SPF_HELO_NONE,SPF_PASS autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 04281C433EF for ; Mon, 13 Sep 2021 10:28:23 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id C84FB61004 for ; Mon, 13 Sep 2021 10:28:22 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S238816AbhIMK3g (ORCPT ); Mon, 13 Sep 2021 06:29:36 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:46774 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S238162AbhIMK3e (ORCPT ); Mon, 13 Sep 2021 06:29:34 -0400 Received: from galois.linutronix.de (Galois.linutronix.de [IPv6:2a0a:51c0:0:12e:550::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id E6606C061574 for ; Mon, 13 Sep 2021 03:28:18 -0700 (PDT) From: Thomas Gleixner DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020; t=1631528895; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=ykiHoHYVr6MJVC+BEHigFkaiSxAMhCFyD3MDWk5rE4U=; b=JgKV1g3IXnqPySAvgrpnErDESL3iApKD2MNRliSUBzndzNYR1eP7/AUuTfZ27HNfo67x74 JXHUg5nnOkp4ASkQ283KizT0taFgtB+gsaK5GJ8x21S5SbnPjlPGCTbNOzSzSQ5TkR4w/q JjgXhja44gBgQJMlGZPKZvkg+tR5dBDL1y+eGr7vVdH300MPsfDi0rmC5EnGbMs3Ah3Jfl AGJtSvIL2NiOy1Zg1pwTjZAnwXuOLTEa4wM0AAZfSEzaXYh3/gIiydWODOaO9/Kq7Exxxj Q8/lylZpbXEFeA38b69xqhP+0odWNNxJABw0n8YQDeCZOEGPe8OTf8+R0GpXYQ== DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020e; t=1631528895; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=ykiHoHYVr6MJVC+BEHigFkaiSxAMhCFyD3MDWk5rE4U=; b=eDY130rAPGpOnJ4rMjUdsrDGIBrRed/uA2ttbJZZn+166Z+N64s3MtM6X5Tvhy5KmAospS pKmW9xwEeKCy4QAA== To: Hillf Danton , Dmitry Vyukov Cc: syzbot , linux-kernel@vger.kernel.org, paulmck@kernel.org, syzkaller-bugs@googlegroups.com Subject: Re: [syzbot] INFO: rcu detected stall in syscall_exit_to_user_mode In-Reply-To: <20210831074532.2255-1-hdanton@sina.com> References: <000000000000eaacf005ca975d1a@google.com> <20210831074532.2255-1-hdanton@sina.com> Date: Mon, 13 Sep 2021 12:28:14 +0200 Message-ID: <87mtogg475.ffs@tglx> MIME-Version: 1.0 Content-Type: text/plain Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue, Aug 31 2021 at 15:45, Hillf Danton wrote: > On Mon, 30 Aug 2021 12:58:58 +0200 Dmitry Vyukov wrote: >>> ieee80211_iterate_active_interfaces_atomic+0x70/0x180 net/mac80211/util.c:829 >>> mac80211_hwsim_beacon+0xd5/0x1a0 drivers/net/wireless/mac80211_hwsim.c:1861 >>> __run_hrtimer kernel/time/hrtimer.c:1537 [inline] >>> __hrtimer_run_queues+0x609/0xe50 kernel/time/hrtimer.c:1601 >>> hrtimer_run_softirq+0x17b/0x360 kernel/time/hrtimer.c:1618 >>> __do_softirq+0x29b/0x9c2 kernel/softirq.c:558 > > Add debug info only to help kasan catch the timer running longer than 2 ticks. > > Is it anything in the right direction, tglx? Not really. As Dmitry pointed out this seems to be related to mac80211_hwsim and if you look at the above stacktrace then how is adding something to the timer wheel helpful? Thanks, tglx