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: 3494 Comm: syzkaller523674 Not tainted 4.15.0-rc6+ #245
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:ffff8801bfdff510 EFLAGS: 00010203
RAX: 0000000000000000 RBX: 1ffff10037fbfea4 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 1ffff10037fbfdee RDI: ffffed0037fbfe90
RBP: ffff8801bfdff5e8 R08: 1ffff10037fbfdb0 R09: 0000000000000000
R10: dffffc0000000000 R11: 0000000000000000 R12: 1ffff10037fbfea8
R13: dffffc0000000000 R14: ffff8801bfdff840 R15: ffffea0006ff42c0
FS:  00007f08926e0700(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055e90040b088 CR3: 00000001bffbd002 CR4: 00000000001606e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 __do_fault+0xeb/0x30f mm/memory.c:3196
 do_read_fault mm/memory.c:3606 [inline]
 do_fault mm/memory.c:3706 [inline]
 handle_pte_fault mm/memory.c:3937 [inline]
 __handle_mm_fault+0x1d8f/0x3ce0 mm/memory.c:4061
 handle_mm_fault+0x334/0x8d0 mm/memory.c:4098
 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:1216
 __mm_populate+0x23a/0x450 mm/gup.c:1266
 mm_populate include/linux/mm.h:2226 [inline]
 vm_mmap_pgoff+0x241/0x280 mm/util.c:338
 SYSC_mmap_pgoff mm/mmap.c:1533 [inline]
 SyS_mmap_pgoff+0x462/0x5f0 mm/mmap.c:1491
 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: 0033:0x44a039
RSP: 002b:00007f08926dfcd8 EFLAGS: 00000216 ORIG_RAX: 0000000000000009
RAX: ffffffffffffffda RBX: 00000000006dbc24 RCX: 000000000044a039
RDX: 0000000001000004 RSI: 0000000000004000 RDI: 0000000020ac6000
RBP: 00000000006dbc20 R08: 0000000000000017 R09: 0000000000000000
R10: 0000000000008011 R11: 0000000000000216 R12: 0000000000000000
R13: 00007ffe3693035f R14: 00007f08926e09c0 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 2b b0 94 fd 48 c7 c6 20 b1 12 86 4c 89 ff e8 bc 98 bd fd <0f> 0b 48 89 95 28 ff ff ff 48 89 85 30 ff ff ff e8 07 b0 94 fd 
RIP: get_page include/linux/mm.h:844 [inline] RSP: ffff8801bfdff510
RIP: mon_bin_vma_fault+0x2f4/0x400 drivers/usb/mon/mon_bin.c:1239 RSP: ffff8801bfdff510
---[ end trace e8311ca4ac11f46d ]---