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: 2 PID: 14813 Comm: blkid Not tainted 4.13.0-rc5-next-20170817+ #5
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011
task: ffff880050e90140 task.stack: ffff880052ca8000
RIP: 0010:bdev_read_page+0x38/0x210 fs/block_dev.c:671
RSP: 0018:ffff880052caeb88 EFLAGS: 00010202
RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 0000000000000006
RDX: 000000000000001c RSI: 000000000000a180 RDI: 00000000000000e0
RBP: ffff880052caebb8 R08: ffff880052caf0a0 R09: ffff880052caefa0
R10: 1ffff1000a595cf6 R11: ffff88003a850490 R12: 0000000000000000
R13: 000000000000a180 R14: ffffea0001a9b200 R15: 0000000000000000
FS:  00007fbf84c33740(0000) GS:ffff88006de00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000001b8f058 CR3: 00000000685b4000 CR4: 00000000000006e0
Call Trace:
 do_mpage_readpage+0x14f9/0x19d0 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
 force_page_cache_readahead+0x1fe/0x340 mm/readahead.c:232
 page_cache_sync_readahead+0xd0/0x100 mm/readahead.c:505
 do_generic_file_read mm/filemap.c:1948 [inline]
 generic_file_read_iter+0x163b/0x26b0 mm/filemap.c:2211
 blkdev_read_iter+0x105/0x170 fs/block_dev.c:1917
 call_read_iter include/linux/fs.h:1737 [inline]
 new_sync_read fs/read_write.c:400 [inline]
 __vfs_read+0x6a7/0xa00 fs/read_write.c:412
 vfs_read+0x11e/0x350 fs/read_write.c:433
 SYSC_read fs/read_write.c:549 [inline]
 SyS_read+0xef/0x220 fs/read_write.c:542
 entry_SYSCALL_64_fastpath+0x1f/0xbe
RIP: 0033:0x7fbf8453a310
RSP: 002b:00007fffcffc3498 EFLAGS: 00000246 ORIG_RAX: 0000000000000000
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fbf8453a310
RDX: 0000000000000400 RSI: 0000000001b8ec58 RDI: 0000000000000003
RBP: 00007fbf847f0e40 R08: 0000000000000028 R09: 0000000000200000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000001b8ec30
R13: 000000000001ffb1 R14: 0000000000000000 R15: 0000000000000004
Code: 89 f5 53 48 89 fb 48 83 ec 08 48 89 55 d0 e8 20 7a b4 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: ffff880052caeb88
---[ end trace 019c5bccfd518e11 ]---