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 -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>