From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751023AbdJAK5X (ORCPT ); Sun, 1 Oct 2017 06:57:23 -0400 Received: from www262.sakura.ne.jp ([202.181.97.72]:47191 "EHLO www262.sakura.ne.jp" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750950AbdJAK5W (ORCPT ); Sun, 1 Oct 2017 06:57:22 -0400 To: pavel@ucw.cz Cc: linux-kernel@vger.kernel.org, adrian.hunter@intel.com, linux-mmc@vger.kernel.org, linux-mm@kvack.org Subject: Re: 4.14-rc2 on thinkpad x220: out of memory when inserting mmc card From: Tetsuo Handa References: <20170905194739.GA31241@amd> <20171001093704.GA12626@amd> <20171001102647.GA23908@amd> In-Reply-To: <20171001102647.GA23908@amd> Message-Id: <201710011957.ICF15708.OOLOHFSQMFFVJt@I-love.SAKURA.ne.jp> X-Mailer: Winbiff [Version 2.51 PL2] X-Accept-Language: ja,en,zh Date: Sun, 1 Oct 2017 19:57:09 +0900 Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Pavel Machek wrote: > Hi! > > > I inserted u-SD card, only to realize that it is not detected as it > > should be. And dmesg indeed reveals: > > Tetsuo asked me to report this to linux-mm. > > But 2^4 is 16 pages, IIRC that can't be expected to work reliably, and > thus this sounds like MMC bug, not mm bug. Yes, 16 pages is costly allocations which will fail without invoking the OOM killer. But I thought this is an interesting case, for mempool allocation should be able to handle memory allocation failure except initial allocations, and initial allocation is failing. I think that using kvmalloc() (and converting corresponding kfree() to kvfree()) will make initial allocations succeed, but that might cause needlessly succeeding subsequent mempool allocations under memory pressure? > > > [10994.299846] mmc0: new high speed SDHC card at address 0003 > > [10994.302196] kworker/2:1: page allocation failure: order:4, > > mode:0x16040c0(GFP_KERNEL|__GFP_COMP|__GFP_NOTRACK), nodemask=(null) > > [10994.302212] CPU: 2 PID: 9500 Comm: kworker/2:1 Not tainted > > 4.14.0-rc2 #135 > > [10994.302215] Hardware name: LENOVO 42872WU/42872WU, BIOS 8DET73WW > > (1.43 ) 10/12/2016 > > [10994.302222] Workqueue: events_freezable mmc_rescan > > [10994.302227] Call Trace: > > [10994.302233] dump_stack+0x4d/0x67 > > [10994.302239] warn_alloc+0xde/0x180 > > [10994.302243] __alloc_pages_nodemask+0xaa4/0xd30 > > [10994.302249] ? cache_alloc_refill+0xb73/0xc10 > > [10994.302252] cache_alloc_refill+0x101/0xc10 > > [10994.302258] ? mmc_init_request+0x2d/0xd0 > > [10994.302262] ? mmc_init_request+0x2d/0xd0 > > [10994.302265] __kmalloc+0xaf/0xe0 > > [10994.302269] mmc_init_request+0x2d/0xd0 > > [10994.302273] alloc_request_size+0x45/0x60 > > [10994.302276] ? free_request_size+0x30/0x30 > > [10994.302280] mempool_create_node+0xd7/0x130 > > [10994.302283] ? alloc_request_simple+0x20/0x20 > > [10994.302287] blk_init_rl+0xe8/0x110 > > [10994.302290] blk_init_allocated_queue+0x70/0x180 > > [10994.302294] mmc_init_queue+0xdd/0x370 > > [10994.302297] mmc_blk_alloc_req+0xf6/0x340 > > [10994.302301] mmc_blk_probe+0x18b/0x4e0 > > [10994.302305] mmc_bus_probe+0x12/0x20 > > [10994.302309] driver_probe_device+0x2f4/0x490 > > > > Order 4 allocations are not supposed to be reliable... > > > > Any ideas? > > > > Thanks, > > Pavel > > > > > > -- > (english) http://www.livejournal.com/~pavelmachek > (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html