linux-kernel - mm: kernel BUG at mm/filemap.c:202

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Date:	Fri, 07 Mar 2014 10:02:10 -0500
From:	Sasha Levin <sasha.levin@...cle.com>
To:	"linux-mm@...ck.org" <linux-mm@...ck.org>
CC:	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Hugh Dickins <hughd@...gle.com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: mm: kernel BUG at mm/filemap.c:202

Hi all,

While fuzzing with trinity inside a KVM tools guest running latest -next kernel I've stumbled on
the following spew:

[  567.833881] kernel BUG at mm/filemap.c:202!
[  567.834485] invalid opcode: 0000 [#1] PREEMPT SMP DEBUG_PAGEALLOC
[  567.835522] Dumping ftrace buffer:
[  567.836752]    (ftrace buffer empty)
[  567.837307] Modules linked in:
[  567.837796] CPU: 23 PID: 14457 Comm: trinity-c323 Tainted: G        W    3.14.0-rc5-next-20140307-sasha-00010-gb6b571d-dirty #111
[  567.839449] task: ffff88021afa8000 ti: ffff88071f290000 task.ti: ffff88071f290000
[  567.840489] RIP: 0010:[<ffffffff8126b3f0>]  [<ffffffff8126b3f0>] __delete_from_page_cache+0x150/0x270
[  567.841649] RSP: 0018:ffff88071f291b78  EFLAGS: 00010046
[  567.841649] RAX: 0000000000000000 RBX: ffffea0002c4ac40 RCX: 00000000ffffffb8
[  567.841649] RDX: 00000000001dc1a8 RSI: 0000000000000018 RDI: ffff88012ffd2000
[  567.841649] RBP: ffff88071f291b98 R08: 0000000000000048 R09: 00000000ffffffff
[  567.841649] R10: 0000000000000001 R11: 0000000000000001 R12: ffff880627f2bd30
[  567.841649] R13: ffff880627f2bd18 R14: 0000000000000000 R15: 0000000000000000
[  567.841649] FS:  00007f15b504d700(0000) GS:ffff88082ba00000(0000) knlGS:0000000000000000
[  567.841649] CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
[  567.841649] CR2: 0000000002eef848 CR3: 000000071fce7000 CR4: 00000000000006a0
[  567.841649] DR0: 0000000000900870 DR1: 00007f15b505a000 DR2: 0000000000000000
[  567.841649] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000602
[  567.841649] Stack:
[  567.841649]  ffffea0002c4ac40 ffff880627f2bd30 0000000000000000
[  567.859673]  0000000000000200
[  567.859673]  ffff88071f291bc8 ffffffff8126b56a ffff880627f2bd18 ffffea0002c4ac40
[  567.859673]  ffff880627f2bd18 ffff88071f291c48 ffff88071f291be8 ffffffff8127fb94
[  567.859673] Call Trace:
[  567.859673]  [<ffffffff8126b56a>] delete_from_page_cache+0x5a/0x90
[  567.859673]  [<ffffffff8127fb94>] truncate_inode_page+0x74/0x90
[  567.859673]  [<ffffffff8128c875>] shmem_undo_range+0x245/0x770
[  567.859673]  [<ffffffff812a01b8>] ? unmap_mapping_range+0x168/0x180
[  567.859673]  [<ffffffff8128cdb8>] shmem_truncate_range+0x18/0x40
[  567.859673]  [<ffffffff8128d0c9>] shmem_fallocate+0x99/0x2f0
[  567.859673]  [<ffffffff8129b7be>] ? madvise_vma+0xde/0x1c0
[  567.859673]  [<ffffffff811ad632>] ? __lock_release+0x1e2/0x200
[  567.859673]  [<ffffffff812f87da>] do_fallocate+0x14a/0x1a0
[  567.859673]  [<ffffffff8129b7d4>] madvise_vma+0xf4/0x1c0
[  567.859673]  [<ffffffff812a765f>] ? find_vma+0x6f/0x90
[  567.859673]  [<ffffffff8129ba28>] SyS_madvise+0x188/0x250
[  567.859673]  [<ffffffff844b1650>] tracesys+0xdd/0xe2
[  567.859673] Code: be 0a 00 00 00 48 89 df e8 8e 55 02 00 48 8b 03 a9 00 00 08 00 74 0d be 18 00 00 00 48 89 df e8 77 55 02 00 8b 43 18 85 c0 78 10 <0f> 0b 66 0f 1f 44 00 00 eb fe 66 0f 1f 44 00 00 48 8b 03 a8 10
[  567.859673] RIP  [<ffffffff8126b3f0>] __delete_from_page_cache+0x150/0x270
[  567.859673]  RSP <ffff88071f291b78>


Thanks,
Sasha
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