From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751653AbaHDC52 (ORCPT ); Sun, 3 Aug 2014 22:57:28 -0400 Received: from userp1040.oracle.com ([156.151.31.81]:38815 "EHLO userp1040.oracle.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751089AbaHDC50 (ORCPT ); Sun, 3 Aug 2014 22:57:26 -0400 Message-ID: <53DEF67E.8090004@oracle.com> Date: Sun, 03 Aug 2014 22:57:02 -0400 From: Sasha Levin User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:24.0) Gecko/20100101 Thunderbird/24.4.0 MIME-Version: 1.0 To: Christoph Lameter , Andrew Morton CC: LKML , Dave Jones , Matt Mackall , Gilad Ben-Yossef , Jens Axboe , Pekka Enberg , David Rientjes , Joonsoo Kim Subject: kernel: smp: WARNING at kernel/smp.c:673 X-Enigmail-Version: 1.6 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit X-Source-IP: ucsinet21.oracle.com [156.151.31.93] Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi all, While fuzzing with trinity inside a KVM tools guest running the latest -next kernel, I've stumbled on the following spew: [ 1226.701012] WARNING: CPU: 6 PID: 8624 at kernel/smp.c:673 on_each_cpu_cond+0x27f/0x2f0() [ 1226.703128] Modules linked in: [ 1226.703955] CPU: 6 PID: 8624 Comm: trinity-c26 Tainted: G W 3.16.0-rc7-next-20140801-sasha-00047-gd6ce559 #991 [ 1226.706792] ffff881b2e8a3000 0000000023830039 0000000000000000 ffff881b2e8a3000 [ 1226.708179] ffff881ada5b3978 ffffffffa1ee96b4 0000000000000000 ffff881ada5b39b8 [ 1226.709610] ffffffff9d1ce5ba ffffffff9d2c0ddf 000000000000001b ffff8807d7608000 [ 1226.710966] Call Trace: [ 1226.711417] dump_stack (lib/dump_stack.c:52) [ 1226.712311] warn_slowpath_common (kernel/panic.c:432) [ 1226.715425] warn_slowpath_null (kernel/panic.c:466) [ 1226.716436] on_each_cpu_cond (kernel/smp.c:673 (discriminator 3)) [ 1226.720821] __kmem_cache_shrink (mm/slub.c:3420) [ 1226.722711] slab_memory_callback (mm/slub.c:3464 mm/slub.c:3556) [ 1226.723925] notifier_call_chain (kernel/notifier.c:93) [ 1226.725244] __blocking_notifier_call_chain (kernel/notifier.c:319) [ 1226.726310] blocking_notifier_call_chain (kernel/notifier.c:329) [ 1226.727263] memory_notify (drivers/base/memory.c:177) [ 1226.728210] __offline_pages.constprop.23 (include/linux/notifier.h:179 mm/memory_hotplug.c:1682) [ 1226.731896] offline_pages (mm/memory_hotplug.c:1787) [ 1226.733095] memory_subsys_offline (drivers/base/memory.c:267 drivers/base/memory.c:304) [ 1226.735208] device_offline (drivers/base/core.c:1428) [ 1226.736966] online_store (drivers/base/core.c:451 (discriminator 2)) [ 1226.737720] dev_attr_store (drivers/base/core.c:138) [ 1226.739986] sysfs_kf_write (fs/sysfs/file.c:116) [ 1226.742105] kernfs_fop_write (fs/kernfs/file.c:308) [ 1226.743058] do_loop_readv_writev (fs/read_write.c:708) [ 1226.745095] do_readv_writev (fs/read_write.c:840) [ 1226.752769] vfs_writev (fs/read_write.c:879) [ 1226.753755] SyS_writev (fs/read_write.c:911 fs/read_write.c:903) [ 1226.754660] tracesys (arch/x86/kernel/entry_64.S:541) No time to dig too much into this today, will work on it tomorrow. Thanks, Sasha