flags: 0x2fffc0000000000()
raw: 02fffc0000000000 0000000000000000 0000000000000000 00000000ffffffff
raw: ffffea0007025ae0 ffffea000708ba60 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: 0 PID: 3487 Comm: syzkaller304615 Not tainted 4.15.0-rc6-mm1+ #50
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+0x1df/0x250 drivers/usb/mon/mon_bin.c:1239
RSP: 0018:ffff8801c0ebf968 EFLAGS: 00010293
RAX: ffff8801c0cc85c0 RBX: ffffea000701b900 RCX: ffffffff817eddec
RDX: 0000000000000000 RSI: ffff8801db41c6d8 RDI: ffffea000701b938
RBP: ffff8801c0ebf988 R08: 0000000000000000 R09: 0000000000000000
R10: ffff8801c0ebfaa0 R11: 0000000000000000 R12: ffff8801c0ebfa50
R13: ffffea000701b900 R14: ffffea0007025ae0 R15: 1ffff100381d7f3e
FS:  00007fd462017700(0000) GS:ffff8801db400000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000002018c000 CR3: 00000001c1728006 CR4: 00000000001606f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 __do_fault+0x8a/0x1d0 mm/memory.c:3224
 do_read_fault mm/memory.c:3634 [inline]
 do_fault mm/memory.c:3734 [inline]
 handle_pte_fault mm/memory.c:3965 [inline]
 __handle_mm_fault+0x1c96/0x3210 mm/memory.c:4089
 handle_mm_fault+0x305/0x840 mm/memory.c:4126
 faultin_page mm/gup.c:502 [inline]
 __get_user_pages+0x37e/0x1140 mm/gup.c:699
 populate_vma_page_range+0x18e/0x230 mm/gup.c:1200
 __mm_populate+0x204/0x350 mm/gup.c:1250
 mm_populate include/linux/mm.h:2233 [inline]
 vm_mmap_pgoff+0x1e1/0x1f0 mm/util.c:338
 SYSC_mmap_pgoff mm/mmap.c:1544 [inline]
 SyS_mmap_pgoff+0x423/0x580 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+0x23/0x9a
RIP: 0033:0x44a0b9
RSP: 002b:00007fd462016d98 EFLAGS: 00000212 ORIG_RAX: 0000000000000009
RAX: ffffffffffffffda RBX: 00000000006dbc24 RCX: 000000000044a0b9
RDX: 0000000001000004 RSI: 0000000000004000 RDI: 0000000020ac6000
RBP: 0000000000000000 R08: 0000000000000008 R09: 0000000000000000
R10: 0000000000008011 R11: 0000000000000212 R12: 00000000006dbc20
R13: 6b66722f7665642f R14: 6273752f7665642f R15: 0000000000000005
Code: 5d c3 bb 02 00 00 00 e8 40 c1 e2 fd 89 d8 5b 41 5c 41 5d 41 5e 5d c3 e8 30 c1 e2 fd 48 c7 c6 c0 08 73 85 48 89 df e8 01 94 03 fe <0f> 0b e8 1a c1 e2 fd 49 8d 5e ff e9 51 ff ff ff e8 4c a8 0e fe 
RIP: get_page include/linux/mm.h:844 [inline] RSP: ffff8801c0ebf968
RIP: mon_bin_vma_fault+0x1df/0x250 drivers/usb/mon/mon_bin.c:1239 RSP: ffff8801c0ebf968
---[ end trace 6cf88e34b66a74e6 ]---