RAX: ffffffffffffffda RBX: 00007f1a4e4026d4 RCX: 0000000000455a09
RDX: 0000000000000000 RSI: 0000000000004c80 RDI: 0000000000000013
RBP: 000000000072bea0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000014
R13: 00000000000002aa R14: 00000000006f8090 R15: 0000000000000030
WARNING: CPU: 1 PID: 4678 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: 4678 Comm: syz-executor0 Not tainted 4.17.0-rc6+ #63
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:ffff88018df778a8 EFLAGS: 00010246
RAX: 0000000000040000 RBX: ffff8801c33d4cc0 RCX: ffffc90001ec8000
RDX: 0000000000040000 RSI: ffffffff8343a2fa RDI: 0000000000000005
RBP: ffff88018df77a78 R08: ffff8801d84f02c0 R09: ffffed003b5e46d2
R10: ffffed003b5e46d2 R11: ffff8801daf23693 R12: 00000000fffffff4
R13: ffff88018df77a50 R14: ffff8801c33d5220 R15: ffff8801c33d4cc4
 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_control_ioctl+0x178/0x500 drivers/block/loop.c:1992
 vfs_ioctl fs/ioctl.c:46 [inline]
 file_ioctl fs/ioctl.c:500 [inline]
 do_vfs_ioctl+0x1cf/0x16a0 fs/ioctl.c:684
 ksys_ioctl+0xa9/0xd0 fs/ioctl.c:701
 __do_sys_ioctl fs/ioctl.c:708 [inline]
 __se_sys_ioctl fs/ioctl.c:706 [inline]
 __x64_sys_ioctl+0x73/0xb0 fs/ioctl.c:706
 do_syscall_64+0x1b1/0x800 arch/x86/entry/common.c:287
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x455a09
RSP: 002b:00007f1a4e401c68 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f1a4e4026d4 RCX: 0000000000455a09
RDX: 0000000000000000 RSI: 0000000000004c80 RDI: 0000000000000013
RBP: 000000000072bea0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000014
R13: 00000000000002aa R14: 00000000006f8090 R15: 0000000000000030
Dumping ftrace buffer:
   (ftrace buffer empty)
Kernel Offset: disabled
Rebooting in 86400 seconds..