R10: 0000000000000000 R11: 0000000000000206 R12: 00007f2f55dcdc90
R13: 00000000006dbc20 R14: 0030656c69662f2e R15: 0000000000000004
WARNING: CPU: 1 PID: 4509 at block/genhd.c:697 __device_add_disk+0x104a/0x1340 block/genhd.c:697
Kernel panic - not syncing: panic_on_warn set ...

CPU: 1 PID: 4509 Comm: syz-executor352 Not tainted 4.17.0-rc4+ #43
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x1b9/0x294 lib/dump_stack.c:113
 panic+0x22f/0x4de kernel/panic.c:184
 __warn.cold.8+0x163/0x1b3 kernel/panic.c:536
 report_bug+0x252/0x2d0 lib/bug.c:186
 fixup_bug arch/x86/kernel/traps.c:178 [inline]
 do_error_trap+0x1de/0x490 arch/x86/kernel/traps.c:296
 do_invalid_op+0x1b/0x20 arch/x86/kernel/traps.c:315
 invalid_op+0x14/0x20 arch/x86/entry/entry_64.S:992
RIP: 0010:__device_add_disk+0x104a/0x1340 block/genhd.c:697
RSP: 0018:ffff8801b06af4e0 EFLAGS: 00010293
RAX: ffff8801acf62200 RBX: ffff8801ac8a3740 RCX: ffffffff83439063
RDX: 0000000000000000 RSI: ffffffff8343919a RDI: 0000000000000005
RBP: ffff8801b06af6b0 R08: ffff8801acf62200 R09: 0000000000000006
R10: ffff8801acf62200 R11: 0000000000000000 R12: 00000000fffffff4
R13: ffff8801b06af688 R14: ffff8801ac8a3ca0 R15: ffff8801ac8a3744
 device_add_disk+0x22/0x30 block/genhd.c:717
 add_disk include/linux/genhd.h:399 [inline]
 loop_add+0x70b/0x9c0 drivers/block/loop.c:1895
 loop_probe+0x185/0x1c0 drivers/block/loop.c:1967
 kobj_lookup+0x269/0x460 drivers/base/map.c:124
 get_gendisk+0x4c/0x380 block/genhd.c:825
 bdev_get_gendisk fs/block_dev.c:1063 [inline]
 bd_start_claiming fs/block_dev.c:1118 [inline]
 blkdev_get+0x16a/0xb30 fs/block_dev.c:1604
 blkdev_get_by_path+0x5c/0xe0 fs/block_dev.c:1689
 mount_bdev+0x5d/0x3e0 fs/super.c:1122
 fuse_mount_blk+0x34/0x40 fs/fuse/inode.c:1222
 mount_fs+0xae/0x328 fs/super.c:1267
 vfs_kern_mount.part.34+0xd4/0x4d0 fs/namespace.c:1037
 vfs_kern_mount fs/namespace.c:1027 [inline]
 do_new_mount fs/namespace.c:2518 [inline]
 do_mount+0x564/0x3070 fs/namespace.c:2848
 ksys_mount+0x12d/0x140 fs/namespace.c:3064
 __do_sys_mount fs/namespace.c:3078 [inline]
 __se_sys_mount fs/namespace.c:3075 [inline]
 __x64_sys_mount+0xbe/0x150 fs/namespace.c:3075
 do_syscall_64+0x1b1/0x800 arch/x86/entry/common.c:287
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x445a09
RSP: 002b:00007f2f55dcdc78 EFLAGS: 00000206 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00000000006dbc24 RCX: 0000000000445a09
RDX: 00000000004ae479 RSI: 0000000020000080 RDI: 00000000200000c0
RBP: 0000000000000005 R08: 00007f2f55dcdc90 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000206 R12: 00007f2f55dcdc90
R13: 00000000006dbc20 R14: 0030656c69662f2e R15: 0000000000000004
Dumping ftrace buffer:
   (ftrace buffer empty)
Kernel Offset: disabled
Rebooting in 86400 seconds..