From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from desiato.infradead.org (desiato.infradead.org [90.155.92.199]) (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 29208210FB for ; Tue, 5 Nov 2024 09:00:53 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=90.155.92.199 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1730797256; cv=none; b=MAv585dMD3+ey0G8WlWJ3Vie6SLgwoykI68ZeeJro6cAPjPFCTe0FNZSxnCsOeU0T2yHxz4oGeI+npjR6WWIn0kHtAxPtgqX5kb/NT2FD4O3yJwKZ0zC+Nc+6/IgTDRk10QeNX21umBYcYXsjPXzs46nX/Rb9HTLLvxs1bHUV1Y= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1730797256; c=relaxed/simple; bh=+dWEKSiPPKe9Q4qzIuFrKujHrXBnfZ+n49kfE4w2F4k=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=IX4hQgWhYgrI4blPjcLUoUkXVUPGSOPOk/nK4JOIJevgZ66yJyZKt4/B4V1J2j7QQDAJvk73MF4Vv+pvWVAgQ/NrEXxn9JTGz4VNLbQCj3F/YZTOq1ZCFz0DNIY77J2bDj+hWxeDiareLnNOhFmLQeLZCdfXbJJTMS9X95crYhY= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=infradead.org; spf=none smtp.mailfrom=infradead.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b=On7RINGJ; arc=none smtp.client-ip=90.155.92.199 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=infradead.org Authentication-Results: smtp.subspace.kernel.org; spf=none smtp.mailfrom=infradead.org Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="On7RINGJ" DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=desiato.20200630; h=In-Reply-To:Content-Type:MIME-Version: References:Message-ID:Subject:Cc:To:From:Date:Sender:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description; bh=eeoMFL25vDDA8pxNB3Ui0X8lscyZM7U+W5OCb3llIrM=; b=On7RINGJZstraBa/hh1hggiwfG QQx8mrDCifCGGMcbCh5FGd9MQ+eWnr9kGiMUlcGn4UF5LmKrINrfV1LbFI2Exb3kIS1PMg2WG3LHt BHC5diWQVnEkoxn1UdNaAbXrDlkr0OCkcUNadl0wtkgRu+K3E1VQ7/1FXzBSj1VVaF7x06PaHGWJF 8zunzwovpNplEOjQ0sCcKwyvnLkEI7k0luCyMqvp/+E+pYM/RKeYHm9ghik6pLS7NsV77vWLFyIYv FL/QkUVl0dAZI3eCaSQ+N3X9pbqH6dCJjrDbGm5JHVBaYCMKgUdQp1kwFVDGYYgYHSyU174fG5Wsa UqBAzQyw==; Received: from j130084.upc-j.chello.nl ([24.132.130.84] helo=noisy.programming.kicks-ass.net) by desiato.infradead.org with esmtpsa (Exim 4.98 #2 (Red Hat Linux)) id 1t8FQf-0000000BhyN-3XAf; Tue, 05 Nov 2024 09:00:50 +0000 Received: by noisy.programming.kicks-ass.net (Postfix, from userid 1000) id E6CA330083E; Tue, 5 Nov 2024 10:00:48 +0100 (CET) Date: Tue, 5 Nov 2024 10:00:48 +0100 From: Peter Zijlstra To: Andrew Morton Cc: syzbot , linux-kernel@vger.kernel.org, linux-mm@kvack.org, syzkaller-bugs@googlegroups.com, Boqun Feng Subject: Re: [syzbot] [mm?] WARNING: locking bug in __set_page_owner Message-ID: <20241105090048.GZ9767@noisy.programming.kicks-ass.net> References: <6727a996.050a0220.35b515.019e.GAE@google.com> <20241104193345.94e0d057a6b16dfb9d83a3fc@linux-foundation.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=us-ascii Content-Disposition: inline In-Reply-To: <20241104193345.94e0d057a6b16dfb9d83a3fc@linux-foundation.org> On Mon, Nov 04, 2024 at 07:33:45PM -0800, Andrew Morton wrote: > On Sun, 03 Nov 2024 08:49:26 -0800 syzbot wrote: > > > Hello, > > > > syzbot found the following issue on: > > Help. I don't understand this lockdep report. > add_stack_record_to_list() is taking spin_lock_irqsave(stack_list_lock) > from within softirq. all seems well? spinlock_t from hardirq context, which is not fine. Should be raw_spinlock_t. Anyway, I send a proposal for this one yesterday, and so far nobody seems to have screamed murder, so I suppose I'll make it compiler and send out proper. https://lkml.kernel.org/r/20241104114506.GC24862@noisy.programming.kicks-ass.net