R13: 00000000004c20ba R14: 00000000004d4988 R15: 0000000000000005
WARNING: CPU: 1 PID: 22062 at block/genhd.c:697 __device_add_disk+0xe63/0x10b0 block/genhd.c:697
Kernel panic - not syncing: panic_on_warn set ...

CPU: 1 PID: 22062 Comm: syz-executor.0 Not tainted 4.19.36 #4
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+0x172/0x1f0 lib/dump_stack.c:113
 panic+0x263/0x51d kernel/panic.c:185
 __warn.cold+0x20/0x54 kernel/panic.c:540
 report_bug+0x263/0x2b0 lib/bug.c:186
 fixup_bug arch/x86/kernel/traps.c:178 [inline]
 fixup_bug arch/x86/kernel/traps.c:173 [inline]
 do_error_trap+0x204/0x360 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:997
RIP: 0010:__device_add_disk+0xe63/0x10b0 block/genhd.c:697
Code: ff ff 4c 89 e7 e8 bd 6c 8c fe e9 dc f2 ff ff e8 33 6d 8c fe e9 b7 f5 ff ff e8 39 0b 56 fe 0f 0b e9 92 fb ff ff e8 2d 0b 56 fe <0f> 0b e9 9a fe ff ff e8 11 e0 29 fe 4c 89 f7 e8 c9 6c 8c fe e9 e1
RSP: 0018:ffff88805f387b08 EFLAGS: 00010246
RAX: 0000000000040000 RBX: ffff88805f387bf0 RCX: ffffc90006080000
RDX: 0000000000040000 RSI: ffffffff831539e3 RDI: 0000000000000005
RBP: ffff88805f387c18 R08: ffff88805d3f2140 R09: ffffed1015d24733
R10: ffffed1015d24732 R11: ffff8880ae923993 R12: ffff88805b02ac80
R13: ffff88805b02ad10 R14: 00000000fffffff4 R15: 0000000000000000
 device_add_disk+0x23/0x30 block/genhd.c:717
 add_disk include/linux/genhd.h:408 [inline]
 loop_add+0x650/0x8d0 drivers/block/loop.c:2013
 loop_control_ioctl drivers/block/loop.c:2114 [inline]
 loop_control_ioctl+0x165/0x360 drivers/block/loop.c:2096
 vfs_ioctl fs/ioctl.c:46 [inline]
 file_ioctl fs/ioctl.c:501 [inline]
 do_vfs_ioctl+0xd6e/0x1390 fs/ioctl.c:688
 ksys_ioctl+0xab/0xd0 fs/ioctl.c:705
 __do_sys_ioctl fs/ioctl.c:712 [inline]
 __se_sys_ioctl fs/ioctl.c:710 [inline]
 __x64_sys_ioctl+0x73/0xb0 fs/ioctl.c:710
 do_syscall_64+0x103/0x610 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x458da9
Code: ad b8 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 7b b8 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007fcd0ebd6c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007fcd0ebd6c90 RCX: 0000000000458da9
RDX: 0000000000000000 RSI: 0000000000004c80 RDI: 0000000000000003
RBP: 000000000073bfa0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007fcd0ebd76d4
R13: 00000000004c20ba R14: 00000000004d4988 R15: 0000000000000005
Kernel Offset: disabled
Rebooting in 86400 seconds..