From mboxrd@z Thu Jan 1 00:00:00 1970 From: Sasha Levin Subject: mm: kernel BUG at mm/memory.c:1230 Date: Thu, 24 May 2012 20:27:34 +0200 Message-ID: <1337884054.3292.22.camel@lappy> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: Sender: linux-kernel-owner@vger.kernel.org To: viro , oleg@redhat.com, akpm@linux-foundation.org, "a.p.zijlstra" , mingo Cc: Dave Jones , "linux-kernel@vger.kernel.org" , linux-mm List-Id: linux-mm.kvack.org Hi all, During fuzzing with trinity inside a KVM tools guest, using latest linux-next, I've stumbled on the following: [ 2043.098949] ------------[ cut here ]------------ [ 2043.099014] kernel BUG at mm/memory.c:1230! [ 2043.099014] invalid opcode: 0000 [#1] PREEMPT SMP DEBUG_PAGEALLOC [ 2043.111029] CPU 3 [ 2043.111029] Pid: 26853, comm: trinity Tainted: G W 3.4.0-next-20120524-sasha-00003-ge89ff01 #281 [ 2043.111029] RIP: 0010:[] [] unmap_page_range+0x232/0x3b0 [ 2043.111029] RSP: 0018:ffff880030349ce8 EFLAGS: 00010246 [ 2043.111029] RAX: ffff880000025000 RBX: ffff8800266bc000 RCX: 00003ffffffff000 [ 2043.111029] RDX: ffff880000000000 RSI: ffff88003028cfc0 RDI: 000000006de001e0 [ 2043.111029] RBP: ffff880030349d68 R08: 0000000100001000 R09: 0000000000000000 [ 2043.111029] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000100000000 [ 2043.111029] R13: 0000000100001000 R14: ffff880030349e08 R15: 0000000100000fff [ 2043.111029] FS: 0000000000000000(0000) GS:ffff880035a00000(0000) knlGS:0000000000000000 [ 2043.111029] CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b [ 2043.111029] CR2: 0000000000000ffc CR3: 0000000013480000 CR4: 00000000000406e0 [ 2043.111029] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 2043.111029] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400 [ 2043.111029] Process trinity (pid: 26853, threadinfo ffff880030348000, task ffff88002ed68000) [ 2043.111029] Stack: [ 2043.111029] ffffffff811f0b55 0000000100000000 0000000100000fff 0000000100001000 [ 2043.111029] ffff880013480000 0000000100000fff 0000000000000000 ffff88003028cfc0 [ 2043.111029] ffff8800142b0020 0000000100001000 ffff880030349d58 ffff88003028cfc0 [ 2043.111029] Call Trace: [ 2043.111029] [] ? follow_page+0x315/0x5a0 [ 2043.111029] [] unmap_single_vma+0xc9/0xe0 [ 2043.111029] [] unmap_vmas+0x62/0xa0 [ 2043.111029] [] exit_mmap+0xc9/0x170 [ 2043.111029] [] ? __khugepaged_exit+0xd5/0x140 [ 2043.111029] [] mmput+0x89/0xe0 [ 2043.111029] [] exit_mm+0x11b/0x130 [ 2043.111029] [] ? _raw_spin_unlock_irq+0x59/0x80 [ 2043.111029] [] do_exit+0x263/0x510 [ 2043.111029] [] do_group_exit+0xa1/0xe0 [ 2043.111029] [] sys_exit_group+0x12/0x20 [ 2043.111029] [] system_call_fastpath+0x16/0x1b [ 2043.111029] Code: 00 48 89 f8 66 66 66 90 84 c0 0f 89 89 00 00 00 4c 89 c0 4c 29 e0 48 3d 00 00 20 00 74 5b 49 8b 06 48 83 b8 a8 00 00 00 00 75 0e <0f> 0b 0f 1f 40 00 eb fe 66 0f 1f 44 00 00 48 8b 3b 48 83 3d 85 [ 2043.111029] RIP [] unmap_page_range+0x232/0x3b0 [ 2043.111029] RSP