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: 2 PID: 4083 Comm: syz-executor6 Not tainted 4.14.0-rc5-next-20171018+ #8
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011
task: ffff88006c556440 task.stack: ffff88006b198000
RIP: 0010:loop_set_fd drivers/block/loop.c:890 [inline]
RIP: 0010:lo_ioctl+0x672/0x1b70 drivers/block/loop.c:1358
print_req_error: I/O error, dev loop3, sector 0
Buffer I/O error on dev loop3, logical block 0, lost async page write
print_req_error: I/O error, dev loop3, sector 8
Buffer I/O error on dev loop3, logical block 1, lost async page write
print_req_error: I/O error, dev loop3, sector 16
Buffer I/O error on dev loop3, logical block 2, lost async page write
print_req_error: I/O error, dev loop3, sector 24
Buffer I/O error on dev loop3, logical block 3, lost async page write
print_req_error: I/O error, dev loop3, sector 32
Buffer I/O error on dev loop3, logical block 4, lost async page write
print_req_error: I/O error, dev loop3, sector 40
Buffer I/O error on dev loop3, logical block 5, lost async page write
print_req_error: I/O error, dev loop3, sector 48
Buffer I/O error on dev loop3, logical block 6, lost async page write
print_req_error: I/O error, dev loop3, sector 56
Buffer I/O error on dev loop3, logical block 7, lost async page write
print_req_error: I/O error, dev loop3, sector 64
Buffer I/O error on dev loop3, logical block 8, lost async page write
print_req_error: I/O error, dev loop3, sector 72
Buffer I/O error on dev loop3, logical block 9, lost async page write
RSP: 0018:ffff88006b19faa0 EFLAGS: 00010202
RAX: 0000000000010000 RBX: dffffc0000000000 RCX: ffffffff8365b372
RDX: 0000000000000037 RSI: ffffc90003814000 RDI: 00000000000001b8
RBP: ffff88006b19fb18 R08: 0000000000000001 R09: 1ffff1000d633f05
R10: ffff88006b19f7f0 R11: 0000000000000001 R12: 0000000000000000
R13: ffff88006b628000 R14: ffff88006d45a680 R15: ffff88006b628150
FS:  00007f047db9f700(0000) GS:ffff88006de00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020766fc5 CR3: 000000004d2b4000 CR4: 00000000000026e0
DR0: 0000000020000000 DR1: 0000000020001000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 __blkdev_driver_ioctl block/ioctl.c:297 [inline]
 blkdev_ioctl+0xc07/0x1de0 block/ioctl.c:594
 block_ioctl+0xde/0x120 fs/block_dev.c:1860
 vfs_ioctl fs/ioctl.c:45 [inline]
 do_vfs_ioctl+0x1b1/0x1520 fs/ioctl.c:685
 SYSC_ioctl fs/ioctl.c:700 [inline]
 SyS_ioctl+0x8f/0xc0 fs/ioctl.c:691
 entry_SYSCALL_64_fastpath+0x1f/0xbe
RIP: 0033:0x447c89
RSP: 002b:00007f047db9ebd8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f047db9f6cc RCX: 0000000000447c89
RDX: 0000000000000013 RSI: 0000000000004c00 RDI: 0000000000000014
RBP: 0000000000000082 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 0000000000004020 R14: 00000000006e80c0 R15: 00007f047db9f700
Code: 00 00 00 48 89 fa 48 c1 ea 03 80 3c 1a 00 0f 85 6f 14 00 00 4d 8b a4 24 f0 00 00 00 49 8d bc 24 b8 01 00 00 48 89 fa 48 c1 ea 03 <80> 3c 1a 00 0f 85 44 14 00 00 4d 8b a4 24 b8 01 00 00 4c 89 e2 
RIP: loop_set_fd drivers/block/loop.c:890 [inline] RSP: ffff88006b19faa0
RIP: lo_ioctl+0x672/0x1b70 drivers/block/loop.c:1358 RSP: ffff88006b19faa0
---[ end trace 6a5ea439dc513bfe ]---