RAX: ffffffffffffffda RBX: 00007ff83abf3c90 RCX: 0000000000457569
RDX: 0000000000000000 RSI: 0000000000004c80 RDI: 0000000000000003
RBP: 000000000072bfa0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007ff83abf46d4
R13: 00000000004c039f R14: 00000000004d0540 R15: 0000000000000005
WARNING: CPU: 0 PID: 1355 at block/genhd.c:697 __device_add_disk+0x1068/0x1360 block/genhd.c:697
Kernel panic - not syncing: panic_on_warn set ...

CPU: 0 PID: 1355 Comm: syz-executor5 Not tainted 4.19.0-rc8+ #291
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+0x1c4/0x2b4 lib/dump_stack.c:113
 panic+0x238/0x4e7 kernel/panic.c:184
 __warn.cold.8+0x163/0x1ba kernel/panic.c:536
 report_bug+0x254/0x2d0 lib/bug.c:186
 fixup_bug arch/x86/kernel/traps.c:178 [inline]
 do_error_trap+0x1fc/0x4d0 arch/x86/kernel/traps.c:296
 do_invalid_op+0x1b/0x20 arch/x86/kernel/traps.c:316
 invalid_op+0x14/0x20 arch/x86/entry/entry_64.S:993
RIP: 0010:__device_add_disk+0x1068/0x1360 block/genhd.c:697
Code: ff ff 48 89 df e8 88 ca 47 fe e9 cb f0 ff ff e8 fe ca 47 fe e9 85 f4 ff ff e8 64 5e 04 fe 0f 0b e9 54 fb ff ff e8 58 5e 04 fe <0f> 0b e9 cb fe ff ff 4c 89 f7 e8 d9 ca 47 fe e9 0e f1 ff ff e8 8f
RSP: 0018:ffff880182caf880 EFLAGS: 00010246
RAX: 0000000000040000 RBX: ffff8801c05dcb00 RCX: ffffc9000c0f7000
RDX: 0000000000040000 RSI: ffffffff837a4af8 RDI: 0000000000000005
RBP: ffff880182cafa50 R08: ffff8801cd198240 R09: 1ffffffff1273955
R10: ffffed003b5c4732 R11: ffff8801dae23993 R12: 00000000fffffff4
R13: ffff880182cafa28 R14: ffff8801c05dd070 R15: ffff8801c05dcb04
 device_add_disk+0x22/0x30 block/genhd.c:717
 add_disk include/linux/genhd.h:408 [inline]
 loop_add+0x741/0xa30 drivers/block/loop.c:1909
 loop_control_ioctl+0x199/0x530 drivers/block/loop.c:2006
 vfs_ioctl fs/ioctl.c:46 [inline]
 file_ioctl fs/ioctl.c:501 [inline]
 do_vfs_ioctl+0x1de/0x1720 fs/ioctl.c:685
 ksys_ioctl+0xa9/0xd0 fs/ioctl.c:702
 __do_sys_ioctl fs/ioctl.c:709 [inline]
 __se_sys_ioctl fs/ioctl.c:707 [inline]
 __x64_sys_ioctl+0x73/0xb0 fs/ioctl.c:707
 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x457569
Code: fd b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 cb b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007ff83abf3c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007ff83abf3c90 RCX: 0000000000457569
RDX: 0000000000000000 RSI: 0000000000004c80 RDI: 0000000000000003
RBP: 000000000072bfa0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007ff83abf46d4
R13: 00000000004c039f R14: 00000000004d0540 R15: 0000000000000005
Kernel Offset: disabled
Rebooting in 86400 seconds..