RDX: 0000000000000000 RSI: 0000000000004c80 RDI: 0000000000000004
RBP: 00007fc3600301d0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000002
R13: 00007fff006c260f R14: 00007fc360030300 R15: 0000000000022000
------------[ cut here ]------------
WARNING: CPU: 1 PID: 22850 at block/genhd.c:721 __device_add_disk.cold+0x17a/0x181 block/genhd.c:721
Kernel panic - not syncing: panic_on_warn set ...

CPU: 1 PID: 22850 Comm: syz-executor.3 Not tainted 4.19.182-syzkaller #0
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+0x1fc/0x2ef lib/dump_stack.c:118
 panic+0x26a/0x50e kernel/panic.c:186
 __warn.cold+0x20/0x5a kernel/panic.c:541
 report_bug+0x262/0x2b0 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+0x1d7/0x310 arch/x86/kernel/traps.c:296
 invalid_op+0x14/0x20 arch/x86/entry/entry_64.S:1038
RIP: 0010:__device_add_disk.cold+0x17a/0x181 block/genhd.c:721
Code: fb e8 27 b5 68 f9 48 c7 c7 e0 55 b2 88 e8 e0 78 f7 ff 0f 0b e9 79 ec 6b fb e8 0f b5 68 f9 48 c7 c7 e0 55 b2 88 e8 c8 78 f7 ff <0f> 0b e9 d9 f3 6b fb e8 f7 b4 68 f9 be 00 01 00 00 bb 00 01 00 00
RSP: 0000:ffff88804ab3fb38 EFLAGS: 00010286
RAX: 0000000000000024 RBX: 0000000000000001 RCX: 0000000000000000
RDX: 0000000000040000 RSI: ffffffff814ddd51 RDI: ffffed1009567f59
RBP: ffff888050ce31c0 R08: 0000000000000024 R09: 0000000000000000
R10: 0000000000000005 R11: 0000000000000000 R12: ffff888050ce3250
R13: ffff888050ce3818 R14: 00000000fffffff4 R15: ffff888050ce31c4
 add_disk include/linux/genhd.h:409 [inline]
 loop_add+0x628/0x8a0 drivers/block/loop.c:2048
 loop_control_ioctl drivers/block/loop.c:2149 [inline]
 loop_control_ioctl+0x16c/0x480 drivers/block/loop.c:2131
 vfs_ioctl fs/ioctl.c:46 [inline]
 file_ioctl fs/ioctl.c:501 [inline]
 do_vfs_ioctl+0xcdb/0x12e0 fs/ioctl.c:688
 ksys_ioctl+0x9b/0xc0 fs/ioctl.c:705
 __do_sys_ioctl fs/ioctl.c:712 [inline]
 __se_sys_ioctl fs/ioctl.c:710 [inline]
 __x64_sys_ioctl+0x6f/0xb0 fs/ioctl.c:710
 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x466459
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 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 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fc360030188 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 000000000056bf60 RCX: 0000000000466459
RDX: 0000000000000000 RSI: 0000000000004c80 RDI: 0000000000000004
RBP: 00007fc3600301d0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000002
R13: 00007fff006c260f R14: 00007fc360030300 R15: 0000000000022000
Kernel Offset: disabled
Rebooting in 86400 seconds..