kasan: CONFIG_KASAN_INLINE enabled
kasan: GPF could be caused by NULL-ptr deref or user memory access
general protection fault: 0000 [#1] SMP KASAN
Dumping ftrace buffer:
   (ftrace buffer empty)
Modules linked in:
CPU: 1 PID: 16836 Comm: syz-executor4 Not tainted 4.13.0-rc4+ #24
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff8801d154c780 task.stack: ffff8801c7198000
RIP: 0010:bdev_read_page+0x38/0x210 fs/block_dev.c:671
RSP: 0018:ffff8801c719e048 EFLAGS: 00010202
RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffffc9000239c000
RDX: 000000000000001c RSI: ffffffff81b2c0c0 RDI: 00000000000000e0
RBP: ffff8801c719e078 R08: ffff8801c719e560 R09: ffff8801c719e460
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 000000000000a180 R14: ffffea00066ce550 R15: 2000000000000000
FS:  00007ffa4bf92700(0000) GS:ffff8801dc100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020034000 CR3: 00000001c1469000 CR4: 00000000001406e0
DR0: 0000000020000020 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600
Call Trace:
 do_mpage_readpage+0x1507/0x19e0 fs/mpage.c:281
 mpage_readpages+0x626/0x8a0 fs/mpage.c:382
 blkdev_readpages+0x2c/0x40 fs/block_dev.c:589
 read_pages mm/readahead.c:121 [inline]
 __do_page_cache_readahead+0x6c6/0xc00 mm/readahead.c:199
 ra_submit mm/internal.h:66 [inline]
 do_sync_mmap_readahead mm/filemap.c:2284 [inline]
 filemap_fault+0xb09/0x1a70 mm/filemap.c:2360
 __do_fault+0xe1/0x3c0 mm/memory.c:2974
 do_read_fault mm/memory.c:3376 [inline]
 do_fault mm/memory.c:3476 [inline]
 handle_pte_fault mm/memory.c:3706 [inline]
 __handle_mm_fault+0x1a38/0x3730 mm/memory.c:3824
 handle_mm_fault+0x144/0x490 mm/memory.c:3861
 faultin_page mm/gup.c:477 [inline]
 __get_user_pages+0x4f8/0x15d0 mm/gup.c:674
 __get_user_pages_locked mm/gup.c:845 [inline]
 __get_user_pages_unlocked mm/gup.c:959 [inline]
 get_user_pages_unlocked+0x2af/0x460 mm/gup.c:984
 get_user_pages_fast+0x91/0xd0 mm/gup.c:1727
 get_futex_key+0xc12/0x1cf0 kernel/futex.c:547
 futex_wake_op kernel/futex.c:1564 [inline]
 do_futex+0xe73/0x1fd0 kernel/futex.c:3403
 SYSC_futex kernel/futex.c:3453 [inline]
 SyS_futex+0x285/0x380 kernel/futex.c:3421
 entry_SYSCALL_64_fastpath+0x1f/0xbe
RIP: 0033:0x4512c9
RSP: 002b:00007ffa4bf91c08 EFLAGS: 00000216 ORIG_RAX: 00000000000000ca
RAX: ffffffffffffffda RBX: 0000000000718000 RCX: 00000000004512c9
RDX: 00000000000001ff RSI: 0000000000000005 RDI: 0000000020012ffc
RBP: 0000000000000086 R08: 0000000020034000 R09: 00000000000000ff
R10: 0000000020060ff0 R11: 0000000000000216 R12: 00000000004b97dd
R13: 00000000ffffffff R14: ffffffffffffffff R15: 0000000020047000
Code: 89 f5 53 48 89 fb 48 83 ec 08 48 89 55 d0 e8 e0 e5 ba ff 48 8d bb e0 00 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 78 01 00 00 4c 8b a3 e0 00 00 00 48 b8 00 00 
RIP: bdev_read_page+0x38/0x210 fs/block_dev.c:671 RSP: ffff8801c719e048
---[ end trace 71d92062e3d19efc ]---