From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from psmtp.com (na3sys010amx178.postini.com [74.125.245.178]) by kanga.kvack.org (Postfix) with SMTP id A17F06B0044 for ; Fri, 23 Nov 2012 07:59:37 -0500 (EST) Date: Fri, 23 Nov 2012 11:13:17 +0100 From: Tomas Racek Subject: Re: 3.7-rc6 soft lockup in kswapd0 Message-ID: <20121123101316.GA10295@luke.redhat.com> Reply-To: 20121123085137.GA646@suse.de MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Sender: owner-linux-mm@kvack.org List-ID: To: Mel Gorman Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org, Jan Kara , Dave Hansen , George Spelvin , riel@redhat.com Hi Mel, I've encoutered the same problem as George yesterday running xfstests in qemu with latest git sources: BUG: soft lockup - CPU#0 stuck for 23s! [kswapd0:31] irq event stamp: 9740956 hardirqs last enabled at (9740955): [] restore_args+0x0/0x30 hardirqs last disabled at (9740956): [] apic_timer_interrupt+0x6d/0x80 softirqs last enabled at (9740954): [] __do_softirq+0x167/0x3d0 softirqs last disabled at (9740949): [] call_softirq+0x1c/0x30 CPU 0 Pid: 31, comm: kswapd0 Not tainted 3.7.0-rc6+ #232 Bochs Bochs Process kswapd0 (pid: 31, threadinfo ffff88003d2cc000, task ffff88003d2d8000) Call Trace: [] zone_watermark_ok_safe+0x71/0x100 [] ? zone_watermark_ok+0x1f/0x30 [] kswapd+0x2fe/0xd70 [] ? try_to_free_pages+0x830/0x830 [] kthread+0xed/0x100 [] ? insert_kthread_work+0x80/0x80 [] ret_from_fork+0x7c/0xb0 [] ? insert_kthread_work+0x80/0x80 Code: 4c 2b 8f 00 01 00 00 48 d1 fa 49 39 d1 7e 30 31 c9 eb 20 0f 1f 80 00 00 00 00 48 8b 87 58 01 00 00 48 d1 fa 48 83 c7 58 48 d3 e0 <49> 29 c1 49 39 d1 7e 0f 83 c1 01 39 f1 75 e0 b8 01 00 00 00 5d Git bisect pointed me to: c654345924f mm: remove __GFP_NO_KSWAPD [adding Rik to Cc:] Prior to this commit I wasn't able to reproduce it. (BTW: I hope I managed to send this mail with proper Reply-To:, strangely your mail and those from Honza were not delivered to my mailbox.) Tom -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org