RAX: ffffffffffffffda RBX: 00000000f5f78ccc RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000066666667 RDI: 0000000000000000
RBP: 00000000f5f79168 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
WARNING: CPU: 0 PID: 31012 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: 31012 Comm: syz-executor0 Not tainted 4.19.0-rc6+ #169
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 08 c5 47 fe e9 cb f0 ff ff e8 7e c5 47 fe e9 85 f4 ff ff e8 54 64 04 fe 0f 0b e9 54 fb ff ff e8 48 64 04 fe <0f> 0b e9 cb fe ff ff 4c 89 f7 e8 59 c5 47 fe e9 0e f1 ff ff e8 4f
RSP: 0018:ffff88018bedf010 EFLAGS: 00010246
RAX: 0000000000040000 RBX: ffff88018c52e400 RCX: ffffc90002055000
RDX: 0000000000040000 RSI: ffffffff837a5138 RDI: 0000000000000005
RBP: ffff88018bedf1e0 R08: ffff8801d78661c0 R09: fffffbfff1287592
R10: fffffbfff1287592 R11: ffffffff8943ac93 R12: 00000000fffffff4
R13: ffff88018bedf1b8 R14: ffff88018c52e970 R15: ffff88018c52e404
 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_probe+0x18d/0x1d0 drivers/block/loop.c:1981
 kobj_lookup+0x264/0x460 drivers/base/map.c:124
 get_gendisk+0x4c/0x380 block/genhd.c:825
 bdev_get_gendisk fs/block_dev.c:1066 [inline]
 __blkdev_get+0x467/0x13c0 fs/block_dev.c:1461
 blkdev_get+0xc1/0xb50 fs/block_dev.c:1617
 blkdev_open+0x1fb/0x280 fs/block_dev.c:1775
 do_dentry_open+0x499/0x1250 fs/open.c:771
 vfs_open+0xa0/0xd0 fs/open.c:880
 do_last fs/namei.c:3418 [inline]
 path_openat+0x12bf/0x5160 fs/namei.c:3534
 do_filp_open+0x255/0x380 fs/namei.c:3564
 do_sys_open+0x568/0x700 fs/open.c:1063
 __do_compat_sys_open fs/open.c:1100 [inline]
 __se_compat_sys_open fs/open.c:1098 [inline]
 __ia32_compat_sys_open+0x79/0xb0 fs/open.c:1098
 do_syscall_32_irqs_on arch/x86/entry/common.c:326 [inline]
 do_fast_syscall_32+0x34d/0xfb2 arch/x86/entry/common.c:397
 entry_SYSENTER_compat+0x70/0x7f arch/x86/entry/entry_64_compat.S:139
RIP: 0023:0xf7f9eca9
Code: 85 d2 74 02 89 0a 5b 5d c3 8b 04 24 c3 8b 0c 24 c3 8b 1c 24 c3 90 90 90 90 90 90 90 90 90 90 90 90 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 eb 0d 90 90 90 90 90 90 90 90 90 90 90 90
RSP: 002b:00000000f5f78c14 EFLAGS: 00000296 ORIG_RAX: 0000000000000005
RAX: ffffffffffffffda RBX: 00000000f5f78ccc RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000066666667 RDI: 0000000000000000
RBP: 00000000f5f79168 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
Kernel Offset: disabled
Rebooting in 86400 seconds..