flags: 0x2fffc0000000000() raw: 02fffc0000000000 0000000000000000 0000000000000000 00000000ffffffff raw: ffffea0007501960 ffffea000726bde0 0000000000000000 0000000000000000 page dumped because: VM_BUG_ON_PAGE(page_ref_count(page) <= 0) ------------[ cut here ]------------ kernel BUG at ./include/linux/mm.h:844! invalid opcode: 0000 [#1] SMP KASAN Dumping ftrace buffer: (ftrace buffer empty) Modules linked in: CPU: 1 PID: 3147 Comm: syzkaller439828 Not tainted 4.15.0-rc4-next-20171221+ #78 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:get_page include/linux/mm.h:844 [inline] RIP: 0010:mon_bin_vma_fault+0x2f4/0x400 drivers/usb/mon/mon_bin.c:1239 RSP: 0018:ffff8801c8fe7510 EFLAGS: 00010203 RAX: 0000000000000000 RBX: 1ffff100391fcea4 RCX: 0000000000000000 RDX: 0000000000000000 RSI: 1ffff100391fcdee RDI: ffffed00391fce90 RBP: ffff8801c8fe75e8 R08: 1ffff100391fcdb0 R09: 0000000000000000 R10: dffffc0000000000 R11: 0000000000000000 R12: 1ffff100391fcea8 R13: dffffc0000000000 R14: ffff8801c8fe7840 R15: ffffea000725e740 FS: 00007fcb70a13700(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00000000205e4ff3 CR3: 00000001cb9e4005 CR4: 00000000001606e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: __do_fault+0xeb/0x30f mm/memory.c:3206 do_read_fault mm/memory.c:3616 [inline] do_fault mm/memory.c:3716 [inline] handle_pte_fault mm/memory.c:3947 [inline] __handle_mm_fault+0x1d8f/0x3ce0 mm/memory.c:4071 handle_mm_fault+0x38f/0x930 mm/memory.c:4108 faultin_page mm/gup.c:502 [inline] __get_user_pages+0x50c/0x15f0 mm/gup.c:699 populate_vma_page_range+0x20e/0x2f0 mm/gup.c:1200 __mm_populate+0x23a/0x450 mm/gup.c:1250 mm_populate include/linux/mm.h:2233 [inline] vm_mmap_pgoff+0x241/0x280 mm/util.c:338 SYSC_mmap_pgoff mm/mmap.c:1544 [inline] SyS_mmap_pgoff+0x462/0x5f0 mm/mmap.c:1502 SYSC_mmap arch/x86/kernel/sys_x86_64.c:100 [inline] SyS_mmap+0x16/0x20 arch/x86/kernel/sys_x86_64.c:91 entry_SYSCALL_64_fastpath+0x1f/0x96 RIP: 0033:0x449529 RSP: 002b:00007fcb70a12d98 EFLAGS: 00000212 ORIG_RAX: 0000000000000009 RAX: ffffffffffffffda RBX: 00000000006dac24 RCX: 0000000000449529 RDX: 0000000001000004 RSI: 0000000000004000 RDI: 0000000020ac6000 RBP: 00000000006dac20 R08: 0000000000000035 R09: 0000000000000000 R10: 0000000000008011 R11: 0000000000000212 R12: 977e79a25a843e8f R13: 6273752f7665642f R14: 74656e2f7665642f R15: 000000000000000b Code: 00 44 89 e0 5b 41 5c 41 5d 41 5e 41 5f 5d c3 41 bc 02 00 00 00 eb bb e8 eb f2 96 fd 48 c7 c6 20 1f d1 85 4c 89 ff e8 8c b4 c0 fd <0f> 0b 48 89 95 28 ff ff ff 48 89 85 30 ff ff ff e8 c7 f2 96 fd RIP: get_page include/linux/mm.h:844 [inline] RSP: ffff8801c8fe7510 RIP: mon_bin_vma_fault+0x2f4/0x400 drivers/usb/mon/mon_bin.c:1239 RSP: ffff8801c8fe7510 ---[ end trace 4fde6e517ea36f73 ]---