flags: 0x2fffc0000000000()
raw: 02fffc0000000000 0000000000000000 0000000000000000 00000000ffffffff
raw: ffffea000720b5e0 ffffea0006f26360 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: syzkaller907950 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:ffff8801c8a6f510 EFLAGS: 00010203
RAX: 0000000000000000 RBX: 1ffff1003914dea4 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 1ffff1003914ddee RDI: ffffed003914de90
RBP: ffff8801c8a6f5e8 R08: 1ffff1003914ddb0 R09: 0000000000000000
R10: dffffc0000000000 R11: 0000000000000000 R12: 1ffff1003914dea8
R13: dffffc0000000000 R14: ffff8801c8a6f840 R15: ffffea0006f26400
FS:  00007eff921e5700(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020403fb0 CR3: 00000001c8a79002 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: 0033:0x4496e9
RSP: 002b:00007eff921e4cd8 EFLAGS: 00000216 ORIG_RAX: 0000000000000009
RAX: ffffffffffffffda RBX: 00000000006dac24 RCX: 00000000004496e9
RDX: 0000000001000004 RSI: 0000000000004000 RDI: 0000000020ac6000
RBP: 00000000006dac20 R08: 00000000000001b6 R09: 0000000000000000
R10: 0000000000008011 R11: 0000000000000216 R12: 0000000000000000
R13: 00007ffe454d390f R14: 00007eff921e59c0 R15: 0000000000000009
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: ffff8801c8a6f510
RIP: mon_bin_vma_fault+0x2f4/0x400 drivers/usb/mon/mon_bin.c:1239 RSP: ffff8801c8a6f510
---[ end trace ad1a8b9142b4e663 ]---