From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-wi0-f173.google.com (mail-wi0-f173.google.com [209.85.212.173]) by kanga.kvack.org (Postfix) with ESMTP id 9CFC56B007D for ; Mon, 9 Dec 2013 04:34:06 -0500 (EST) Received: by mail-wi0-f173.google.com with SMTP id hn9so3448678wib.0 for ; Mon, 09 Dec 2013 01:34:06 -0800 (PST) Received: from mx2.suse.de (cantor2.suse.de. [195.135.220.15]) by mx.google.com with ESMTP id 5si8704882eei.123.2013.12.09.01.34.05 for ; Mon, 09 Dec 2013 01:34:05 -0800 (PST) Message-ID: <52A58E8A.3050401@suse.cz> Date: Mon, 09 Dec 2013 10:34:02 +0100 From: Vlastimil Babka MIME-Version: 1.0 Subject: Re: kernel BUG in munlock_vma_pages_range References: <52A3D0C3.1080504@oracle.com> In-Reply-To: <52A3D0C3.1080504@oracle.com> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Sender: owner-linux-mm@kvack.org List-ID: To: Sasha Levin , Andrew Morton Cc: joern@logfs.org, mgorman@suse.de, Michel Lespinasse , riel@redhat.com, LKML , "linux-mm@kvack.org" On 12/08/2013 02:52 AM, Sasha Levin wrote: > Hi all, > > While fuzzing with trinity inside a KVM tools guest running latest -next kernel, > I've stumbled on the following spew. > > The code seems to be in munlock_vma_pages_range(): > > page = follow_page_mask(vma, start, FOLL_GET | FOLL_DUMP, > &page_mask); > > if (page && !IS_ERR(page)) { > if (PageTransHuge(page)) { <<==== HERE > lock_page(page); > > > This is new code added in "mm: munlock: batch non-THP page isolation and munlock+putback > using pagevec". I've Cc'ed involved parties. Hello, I will look at it, thanks. Do you have specific reproduction instructions? Vlastimil > [ 356.390309] kernel BUG at include/linux/page-flags.h:415! > [ 356.390309] invalid opcode: 0000 [#1] PREEMPT SMP DEBUG_PAGEALLOC > [ 356.395160] Dumping ftrace buffer: > [ 356.395160] (ftrace buffer empty) > [ 356.395160] Modules linked in: > [ 356.395160] CPU: 36 PID: 10919 Comm: trinity-child74 Not tainted > 3.13.0-rc2-next-20131206-sasha-00005-g8be2375-dirty #4045 > [ 356.395160] task: ffff880f731e0000 ti: ffff880f731e8000 task.ti: ffff880f731e8000 > [ 356.395160] RIP: 0010:[] [] munlock_vma_pages_range+0x89/0x1b0 > [ 356.395160] RSP: 0018:ffff880f731e9b58 EFLAGS: 00010286 > [ 356.395160] RAX: 002fffff80008000 RBX: 00007f91cd801000 RCX: 0000000000000000 > [ 356.395160] RDX: ffffea003ded0040 RSI: 00000000000013f1 RDI: 00000000ffffffff > [ 356.395160] RBP: ffff880f731e9c18 R08: 00000000e26e4584 R09: 0000000000000001 > [ 356.395160] R10: 0000000000000001 R11: 0000000000000000 R12: ffffea003ded0040 > [ 356.395160] R13: ffff880f733a8400 R14: 00007f91cdeea000 R15: ffff880f731e9be4 > [ 356.395160] FS: 0000000000000000(0000) GS:ffff880fdba00000(0000) knlGS:0000000000000000 > [ 356.395160] CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b > [ 356.395160] CR2: 0000000000000000 CR3: 0000000f7314a000 CR4: 00000000000006e0 > [ 356.395160] Stack: > [ 356.395160] 0000000000000000 0000000000000000 0000000000000000 0000000000000000 > [ 356.395160] 0000000000000000 0000000000000000 0000000000000000 0000000000000000 > [ 356.395160] 0000000000000000 0000000000000000 0000000000000000 0000000000000000 > [ 356.395160] Call Trace: > [ 356.395160] [] exit_mmap+0x59/0x170 > [ 356.395160] [] ? __khugepaged_exit+0xe0/0x150 > [ 356.395160] [] ? kmem_cache_free+0x24b/0x310 > [ 356.395160] [] ? __khugepaged_exit+0xe0/0x150 > [ 356.395160] [] mmput+0x7c/0xf0 > [ 356.395160] [] exit_mm+0x18d/0x1a0 > [ 356.395160] [] ? acct_collect+0x175/0x1b0 > [ 356.395160] [] do_exit+0x26f/0x4e0 > [ 356.395160] [] do_group_exit+0xa9/0xe0 > [ 356.395160] [] get_signal_to_deliver+0x460/0x4b0 > [ 356.395160] [] do_signal+0x4b/0x120 > [ 356.395160] [] ? _raw_spin_unlock+0x35/0x60 > [ 356.395160] [] ? vtime_account_user+0x96/0xb0 > [ 356.395160] [] ? context_tracking_user_exit+0xaf/0x160 > [ 356.395160] [] do_notify_resume+0x5a/0xe0 > [ 356.395160] [] int_signal+0x12/0x17 > [ 356.395160] Code: 48 89 de 4c 89 ef e8 17 7f ff ff 49 89 c4 48 85 c0 0f 84 eb 00 00 00 48 3d 00 > f0 ff ff 0f 87 df 00 00 00 48 8b 00 66 85 c0 79 0f <0f> 0b 0f 1f 44 00 00 eb fe 66 0f 1f 44 00 00 49 > 8b 04 24 f6 c4 > [ 356.395160] RIP [] munlock_vma_pages_range+0x89/0x1b0 > [ 356.395160] RSP > -- 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