From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757831Ab3LWTbG (ORCPT ); Mon, 23 Dec 2013 14:31:06 -0500 Received: from userp1040.oracle.com ([156.151.31.81]:22877 "EHLO userp1040.oracle.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1757269Ab3LWTbE (ORCPT ); Mon, 23 Dec 2013 14:31:04 -0500 Message-ID: <52B88F6E.8070909@oracle.com> Date: Mon, 23 Dec 2013 14:30:54 -0500 From: Sasha Levin User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:24.0) Gecko/20100101 Thunderbird/24.1.0 MIME-Version: 1.0 To: Andrew Morton CC: "linux-mm@kvack.org" , LKML , Dave Jones Subject: mm: kernel BUG at mm/huge_memory.c:1440! Content-Type: text/plain; charset=ISO-8859-1; format=flowed 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 latest -next kernel, I've stumbled on the following spew. page = pmd_page(orig_pmd); page_remove_rmap(page); VM_BUG_ON(page_mapcount(page) < 0); add_mm_counter(tlb->mm, MM_ANONPAGES, -HPAGE_PMD_NR); VM_BUG_ON(!PageHead(page)); <=== HERE atomic_long_dec(&tlb->mm->nr_ptes); spin_unlock(ptl); tlb_remove_page(tlb, page); [ 265.474585] kernel BUG at mm/huge_memory.c:1440! [ 265.475129] invalid opcode: 0000 [#1] PREEMPT SMP DEBUG_PAGEALLOC [ 265.476684] Dumping ftrace buffer: [ 265.477144] (ftrace buffer empty) [ 265.478398] Modules linked in: [ 265.478807] CPU: 8 PID: 11344 Comm: trinity-c206 Tainted: G W 3.13.0-rc5-ne xt-20131223-sasha-00015-gec22156-dirty #8 [ 265.480172] task: ffff8801cb573000 ti: ffff8801cbd3a000 task.ti: ffff8801cbd3a000 [ 265.480172] RIP: 0010:[] [] zap_huge_pmd+0x170/0 x1f0 [ 265.480172] RSP: 0000:ffff8801cbd3bc78 EFLAGS: 00010246 [ 265.480172] RAX: 015fffff80090018 RBX: ffff8801cbd3bde8 RCX: ffffffffffffff9c [ 265.480172] RDX: ffffffffffffffff RSI: 0000000000000008 RDI: ffff8800bffd2000 [ 265.480172] RBP: ffff8801cbd3bcb8 R08: 0000000000000000 R09: 0000000000000000 [ 265.480172] R10: 0000000000000001 R11: 0000000000000000 R12: ffffea0002856740 [ 265.480172] R13: ffffea0002d50000 R14: 00007ff915000000 R15: 00007ff930e48fff [ 265.480172] FS: 00007ff934899700(0000) GS:ffff88014d400000(0000) knlGS:0000000000000 000 [ 265.480172] CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b [ 265.480172] CR2: 00007ff93428a000 CR3: 000000010babe000 CR4: 00000000000006e0 [ 265.480172] Stack: [ 265.480172] 00000000000004dd ffff8801ccbfbb60 ffff8801cbd3bcb8 ffff8801cbb15540 [ 265.480172] 00007ff915000000 00007ff930e49000 ffff8801cbd3bde8 00007ff930e48fff [ 265.480172] ffff8801cbd3bd48 ffffffff812885b6 ffff88005f5d20c0 00007ff915200000 [ 265.480172] Call Trace: [ 265.480172] [] unmap_page_range+0x2c6/0x410 [ 265.480172] [] unmap_single_vma+0x101/0x120 [ 265.480172] [] unmap_vmas+0x61/0xa0 [ 265.480172] [] exit_mmap+0xd0/0x170 [ 265.480172] [] mmput+0x70/0xe0 [ 265.480172] [] exit_mm+0x18d/0x1a0 [ 265.480172] [] ? acct_collect+0x175/0x1b0 [ 265.480172] [] do_exit+0x26f/0x520 [ 265.480172] [] do_group_exit+0xa9/0xe0 [ 265.480172] [] SyS_exit_group+0x17/0x20 [ 265.480172] [] tracesys+0xdd/0xe2 [ 265.480172] Code: 0f 0b 66 0f 1f 84 00 00 00 00 00 eb fe 66 0f 1f 44 00 00 48 8b 03 f0 48 81 80 50 03 00 00 00 fe ff ff 49 8b 45 00 f6 c4 40 75 10 <0f> 0b 66 0f 1f 44 00 00 eb fe 66 0f 1f 44 00 00 48 8b 03 f0 48 [ 265.480172] RIP [] zap_huge_pmd+0x170/0x1f0 [ 265.480172] RSP Thanks, Sasha