From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.129.124]) (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 DFB2F2397BC for ; Mon, 13 Jan 2025 09:01:20 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=170.10.129.124 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1736758882; cv=none; b=i9SEThccvR7lPvwHfTOigPuXdWx0VzU52FI7kWSeK3yYWjRE1WYAEmO1+cDgmUx7BypoPu+sw28F44TVLSl2dXZW1o9V53V1QJzH0VRPlcUC170WV4yKeInylOgkJ0MMpSLaOUVGoCyQWbXdn7CPrMfJTW9sCL7BPcN6euYDgws= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1736758882; c=relaxed/simple; bh=QfxFDE/SxN65YW8tROnk89UHpBfj2EpK7USnpplK1hA=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=pm+Jbs2ViwKRuBRgUz6w615V4rvIOL3nbyUPARLh8pUfCGquqQEjbiqzh+GVw4XjIYPVh0mf0bWnGvCec82S+FblZH0e1g15VxosfLrC+8yhqAX1hLlA+UD6IR8EIuqZrafVS8pCF+eQyZ4l2LYBBf0gE+mlvl77uhSNpFmME44= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=redhat.com; spf=pass smtp.mailfrom=redhat.com; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b=Esc745qO; arc=none smtp.client-ip=170.10.129.124 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=redhat.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=redhat.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="Esc745qO" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1736758880; 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: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=bg84P2K9ssfrVByrnuh9eaewIWJz6nPH137Kv912h5Y=; b=Esc745qOW5A46+xDgESCUUX0fIetQZWKHFX9SlajLRnuTyVz4RRdcmilZch/S5HlkP5O5G VSXdr8QXUFJqtSccC/EsIFQXVrd/tpacgNpon2Oxr7eOS9Sk1UufYtvOPxAgtqSIRy5NKI MjQX/ZDmuZb+wW+kbQ0ry1M7WOWTnBs= Received: from mx-prod-mc-03.mail-002.prod.us-west-2.aws.redhat.com (ec2-54-186-198-63.us-west-2.compute.amazonaws.com [54.186.198.63]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-77-XNn9SKZQMqqh7Q_yC_NeJw-1; Mon, 13 Jan 2025 04:01:16 -0500 X-MC-Unique: XNn9SKZQMqqh7Q_yC_NeJw-1 X-Mimecast-MFC-AGG-ID: XNn9SKZQMqqh7Q_yC_NeJw Received: from mx-prod-int-04.mail-002.prod.us-west-2.aws.redhat.com (mx-prod-int-04.mail-002.prod.us-west-2.aws.redhat.com [10.30.177.40]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by mx-prod-mc-03.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTPS id B5E7019560B9; Mon, 13 Jan 2025 09:01:14 +0000 (UTC) Received: from fedora (unknown [10.72.116.4]) by mx-prod-int-04.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTPS id BCA4919560AD; Mon, 13 Jan 2025 09:01:09 +0000 (UTC) Date: Mon, 13 Jan 2025 17:01:04 +0800 From: Ming Lei To: Thomas =?iso-8859-1?Q?Hellstr=F6m?= Cc: Jens Axboe , linux-block@vger.kernel.org, Christoph Hellwig , John Garry , stable@vger.kernel.org Subject: Re: [PATCH V2] block: mark GFP_NOIO around sysfs ->store() Message-ID: References: <20250113084103.762630-1-ming.lei@redhat.com> <076ee902633a7293393748cb972cc4a7743ec5c1.camel@linux.intel.com> Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <076ee902633a7293393748cb972cc4a7743ec5c1.camel@linux.intel.com> X-Scanned-By: MIMEDefang 3.0 on 10.30.177.40 On Mon, Jan 13, 2025 at 09:50:37AM +0100, Thomas Hellström wrote: > Hi! > > On Mon, 2025-01-13 at 16:41 +0800, Ming Lei wrote: > > sysfs ->store is called with queue freezed, meantime we have several > > ->store() callbacks(update_nr_requests, wbt, scheduler) to allocate > > memory with GFP_KERNEL which may run into direct reclaim code path, > > then potential deadlock can be caused. > > > > Fix the issue by marking NOIO around sysfs ->store() > > > > Reviewed-by: Christoph Hellwig > > Reviewed-by: John Garry > > Reported-by: Thomas Hellström > > Closes: > > https://lore.kernel.org/linux-block/ead7c5ce5138912c1f3179d62370b84a64014a38.camel@linux.intel.com/ > > Fixes: bd166ef183c2 ("blk-mq-sched: add framework for MQ capable IO > > schedulers") > > Does this fix also the #2 lockdep splat in that email? No. The #2 splat fix has been merged to for-6.14/block, and this patch only covers the one reported in the Closes link. https://lore.kernel.org/linux-block/20250110054726.1499538-1-hch@lst.de/ Thanks, Ming