Hello, I've got another BUG in khugepaged while running syzkaller fuzzer: kernel BUG at mm/rmap.c:1248! invalid opcode: 0000 [#1] SMP DEBUG_PAGEALLOC KASAN Dumping ftrace buffer: (ftrace buffer empty) Modules linked in: CPU: 2 PID: 1340 Comm: khugepaged Not tainted 4.8.0-rc3-next-20160825+ #8 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011 task: ffff88006a40c580 task.stack: ffff88006a438000 RIP: 0010:[<ffffffff817b6a30>] [<ffffffff817b6a30>] page_add_new_anon_rmap+0x2e0/0x450 mm/rmap.c:1248 RSP: 0018:ffff88006a43f9c8 EFLAGS: 00010296 RAX: 0000000000000154 RBX: ffffea0000548000 RCX: 0000000000000000 RDX: 0000000000000154 RSI: 0000000000000001 RDI: ffffed000d487f15 RBP: ffff88006a43fa00 R08: 0000000000000001 R09: 0000000000000000 R10: ffff88003cc505c0 R11: 0000000000000001 R12: ffff880038cecd00 R13: 000000c440200000 R14: 0000000000000001 R15: ffff88006a43fb88 FS: 0000000000000000(0000) GS:ffff88006d200000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000c43d56a000 CR3: 000000000861c000 CR4: 00000000000006e0 DR0: 000000000000001e DR1: 000000000000001e DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600 Stack: ffffea0000f29c40 ffff880000000200 80000000152000e7 ffff880038cecd00 ffffea0000f29c40 ffffea0000548000 ffff88006a43fb88 ffff88006a43fbb0 ffffffff81830466 ffffed000719d9a8 ffff880038cecd40 ffffffff00000001 Call Trace: [<ffffffff81830466>] collapse_huge_page+0x2d36/0x3500 mm/khugepaged.c:1066 [< inline >] khugepaged_scan_pmd mm/khugepaged.c:1205 [< inline >] khugepaged_scan_mm_slot mm/khugepaged.c:1718 [< inline >] khugepaged_do_scan mm/khugepaged.c:1799 [<ffffffff818329fb>] khugepaged+0x1dcb/0x2b30 mm/khugepaged.c:1844 [<ffffffff813f120f>] kthread+0x23f/0x2d0 kernel/kthread.c:209 [<ffffffff86e1098a>] ret_from_fork+0x2a/0x40 arch/x86/entry/entry_64.S:431 Code: df e8 a5 35 fc ff 0f 0b e8 fe 52 e1 ff 48 c7 c6 20 42 11 87 48 89 df e8 8f 35 fc ff 0f 0b e8 e8 52 e1 ff 4c 89 e7 e8 20 2d fc ff <0f> 0b e8 d9 52 e1 ff 4c 89 fa 48 b8 00 00 00 00 00 fc ff df 48 RIP [<ffffffff817b6a30>] page_add_new_anon_rmap+0x2e0/0x450 mm/rmap.c:1248 RSP <ffff88006a43f9c8> ---[ end trace 27dc22f88d620ad9 ]--- On 0f98f121e1670eaa2a2fbb675e07d6ba7f0e146f of linux-next. -- 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>