R13: 00000000004c087d R14: 00000000004d19b8 R15: 000000000000000a
WARNING: CPU: 0 PID: 9481 at block/genhd.c:704 __device_add_disk+0x10e6/0x13e0 block/genhd.c:704
Kernel panic - not syncing: panic_on_warn set ...
CPU: 0 PID: 9481 Comm: syz-executor4 Not tainted 4.20.0-rc7+ #156
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+0x244/0x39d lib/dump_stack.c:113
 panic+0x2ad/0x55c kernel/panic.c:188
 __warn.cold.8+0x20/0x45 kernel/panic.c:540
 report_bug+0x254/0x2d0 lib/bug.c:186
 fixup_bug arch/x86/kernel/traps.c:178 [inline]
 do_error_trap+0x11b/0x200 arch/x86/kernel/traps.c:271
 do_invalid_op+0x36/0x40 arch/x86/kernel/traps.c:290
 invalid_op+0x14/0x20 arch/x86/entry/entry_64.S:973
RIP: 0010:__device_add_disk+0x10e6/0x13e0 block/genhd.c:704
Code: 00 80 a3 dc 00 00 00 ef e9 57 f7 ff ff e8 62 92 ff fd 0f 0b e9 cf f7 ff ff e8 56 92 ff fd 0f 0b e9 eb f6 ff ff e8 4a 92 ff fd <0f> 0b e9 e5 fd ff ff 4c 89 f7 e8 4b f8 42 fe e9 97 f0 ff ff e8 61
RSP: 0018:ffff8881a3c67870 EFLAGS: 00010246
RAX: 0000000000040000 RBX: ffff88818325aec0 RCX: ffffc90005a50000
RDX: 0000000000040000 RSI: ffffffff837ff226 RDI: 0000000000000005
RBP: ffff8881a3c67a48 R08: ffff8881b4ce8340 R09: ffffed103b5c5b5f
R10: ffffed103b5c5b5f R11: ffff8881dae2dafb R12: ffff8881a3c67a20
R13: 00000000fffffff4 R14: ffff88818325b430 R15: ffff88818325aec4
 device_add_disk+0x2a/0x40 block/genhd.c:726
 add_disk include/linux/genhd.h:409 [inline]
 loop_add+0x75b/0xa40 drivers/block/loop.c:1908
 loop_control_ioctl+0x199/0x530 drivers/block/loop.c:2005
 vfs_ioctl fs/ioctl.c:46 [inline]
 file_ioctl fs/ioctl.c:509 [inline]
 do_vfs_ioctl+0x1de/0x1790 fs/ioctl.c:696
 ksys_ioctl+0xa9/0xd0 fs/ioctl.c:713
 __do_sys_ioctl fs/ioctl.c:720 [inline]
 __se_sys_ioctl fs/ioctl.c:718 [inline]
 __x64_sys_ioctl+0x73/0xb0 fs/ioctl.c:718
 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x457669
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:00007f7c8bd4fc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f7c8bd4fc90 RCX: 0000000000457669
RDX: 0000000000000000 RSI: 0000000000004c80 RDI: 0000000000000008
RBP: 000000000072bf00 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f7c8bd506d4
R13: 00000000004c087d R14: 00000000004d19b8 R15: 000000000000000a
Kernel Offset: disabled
Rebooting in 86400 seconds..