RAX: ffffffffffffffda RBX: 00007ff8969b76d4 RCX: 0000000000455979 RDX: 0000000000000000 RSI: 0000000000004c80 RDI: 0000000000000013 RBP: 000000000072bea0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000015 R13: 00000000000002ac R14: 00000000006f80c0 R15: 0000000000000030 WARNING: CPU: 1 PID: 3427 at block/genhd.c:697 __device_add_disk+0x104a/0x1340 block/genhd.c:697 Kernel panic - not syncing: panic_on_warn set ... CPU: 1 PID: 3427 Comm: syz-executor0 Not tainted 4.17.0-rc4+ #44 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+0x1b9/0x294 lib/dump_stack.c:113 panic+0x22f/0x4de kernel/panic.c:184 __warn.cold.8+0x163/0x1b3 kernel/panic.c:536 report_bug+0x252/0x2d0 lib/bug.c:186 fixup_bug arch/x86/kernel/traps.c:178 [inline] do_error_trap+0x1de/0x490 arch/x86/kernel/traps.c:296 do_invalid_op+0x1b/0x20 arch/x86/kernel/traps.c:315 invalid_op+0x14/0x20 arch/x86/entry/entry_64.S:992 RIP: 0010:__device_add_disk+0x104a/0x1340 block/genhd.c:697 RSP: 0018:ffff8801838a78a8 EFLAGS: 00010246 RAX: 0000000000040000 RBX: ffff8801ad402e40 RCX: ffffc90001ea0000 RDX: 0000000000040000 RSI: ffffffff8343919a RDI: 0000000000000005 RBP: ffff8801838a7a78 R08: ffff8801867d0140 R09: ffffed003b5e46c2 R10: ffffed003b5e46c2 R11: ffff8801daf23613 R12: 00000000fffffff4 R13: ffff8801838a7a50 R14: ffff8801ad4033a0 R15: ffff8801ad402e44 device_add_disk+0x22/0x30 block/genhd.c:717 add_disk include/linux/genhd.h:399 [inline] loop_add+0x70b/0x9c0 drivers/block/loop.c:1895 loop_control_ioctl+0x178/0x500 drivers/block/loop.c:1992 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:500 [inline] do_vfs_ioctl+0x1cf/0x16a0 fs/ioctl.c:684 ksys_ioctl+0xa9/0xd0 fs/ioctl.c:701 __do_sys_ioctl fs/ioctl.c:708 [inline] __se_sys_ioctl fs/ioctl.c:706 [inline] __x64_sys_ioctl+0x73/0xb0 fs/ioctl.c:706 do_syscall_64+0x1b1/0x800 arch/x86/entry/common.c:287 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x455979 RSP: 002b:00007ff8969b6c68 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007ff8969b76d4 RCX: 0000000000455979 RDX: 0000000000000000 RSI: 0000000000004c80 RDI: 0000000000000013 RBP: 000000000072bea0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000015 R13: 00000000000002ac R14: 00000000006f80c0 R15: 0000000000000030 Dumping ftrace buffer: (ftrace buffer empty) Kernel Offset: disabled Rebooting in 86400 seconds..