Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1162808Ab3DEVn0 (ORCPT ); Fri, 5 Apr 2013 17:43:26 -0400 Received: from www.sr71.net ([198.145.64.142]:49698 "EHLO blackbird.sr71.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1162524Ab3DEVnZ (ORCPT ); Fri, 5 Apr 2013 17:43:25 -0400 Message-ID: <515F457E.5050505@sr71.net> Date: Fri, 05 Apr 2013 14:43:26 -0700 From: Dave Hansen User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:17.0) Gecko/20130308 Thunderbird/17.0.4 MIME-Version: 1.0 To: "Srivatsa S. Bhat" , linux-kernel@vger.kernel.org, Thomas Gleixner Subject: kernel BUG at kernel/smpboot.c:134! Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 3277 Lines: 55 Hey Thomas, I seem to be running in to smpboot_thread_fn()'s BUG_ON(td->cpu != smp_processor_id()); pretty regularly, both at boot and if I boot with maxcpus=x and then online the CPUs from sysfs after boot. It's a 160-logical-cpu system, so it's quite a beast. I _seem_ to be hitting it more often at higher cpu counts, but it doesn't trigger on bringing up a particular CPU as far as I can tell. This is on a pull of mainline from today, e0a77f263. Any ideas? > [ 790.223270] ------------[ cut here ]------------ > [ 790.223966] kernel BUG at kernel/smpboot.c:134! > [ 790.224739] invalid opcode: 0000 [#1] SMP > [ 790.225671] Modules linked in: > [ 790.226428] CPU 81 > [ 790.226909] Pid: 3909, comm: migration/135 Tainted: G W 3.9.0-rc5-00184-gb6a9b7f-dirty #118 FUJITSU-SV PRIMEQUEST 1800E2/SB > [ 790.228775] RIP: 0010:[] [] smpboot_thread_fn+0x258/0x280 > [ 790.230205] RSP: 0018:ffff88bfef9c1e08 EFLAGS: 00010202 > [ 790.231090] RAX: 0000000000000051 RBX: ffff88bfefb82000 RCX: 000000000000b888 > [ 790.231653] RDX: ffff88bfef9c1fd8 RSI: ffff881fff000000 RDI: 0000000000000087 > [ 790.232085] RBP: ffff88bfef9c1e38 R08: 0000000000000001 R09: 0000000000000000 > [ 790.232850] R10: 0000000000000018 R11: 0000000000000000 R12: ffff88bfec9e22e0 > [ 790.233561] R13: ffffffff81e587a0 R14: ffff88bfec9e22e0 R15: 0000000000000000 > [ 790.234004] FS: 0000000000000000(0000) GS:ffff881fff000000(0000) knlGS:0000000000000000 > [ 790.234918] CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b > [ 790.235602] CR2: 00007fa89a333c62 CR3: 0000000001e0b000 CR4: 00000000000007e0 > [ 790.236110] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 > [ 790.236584] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400 > [ 790.237329] Process migration/135 (pid: 3909, threadinfo ffff88bfef9c0000, task ffff88bfec9e22e0) > [ 790.238321] Stack: > [ 790.238882] ffff88bfef9c1e38 0000000000000000 ffff88ffef421cc0 ffff88bfef9c1ec0 > [ 790.245415] ffff88bfefb82000 ffffffff8110bc90 ffff88bfef9c1f48 ffffffff810ff1df > [ 790.250755] 0000000000000001 0000000000000087 ffff88bfefb82000 0000000000000000 > [ 790.253365] Call Trace: > [ 790.254121] [] ? __smpboot_create_thread+0x180/0x180 > [ 790.255428] [] kthread+0xef/0x100 > [ 790.256071] [] ? wait_for_completion+0x124/0x180 > [ 790.256697] [] ? __init_kthread_worker+0x80/0x80 > [ 790.257325] [] ret_from_fork+0x7c/0xb0 > [ 790.258233] [] ? __init_kthread_worker+0x80/0x80 > [ 790.258942] Code: ef 3d 01 01 48 89 df e8 87 b0 16 00 48 83 05 67 ef 3d 01 01 48 83 c4 10 31 c0 5b 41 5c 41 5d 41 5e 5d c3 48 83 05 90 ef 3d 01 01 <0f> 0b 48 83 05 96 ef 3d 01 01 48 83 05 56 ef 3d 01 01 0f 0b 48 > [ 790.276178] RIP [] smpboot_thread_fn+0x258/0x280 > [ 790.276735] RSP > [ 790.278348] ---[ end trace 84baa2bee1434240 ]--- -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/