RBP: 000000000072bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007fd2181ed6d4 R13: 00000000004c0606 R14: 00000000004d0a30 R15: 000000000000000a WARNING: CPU: 1 PID: 16527 at block/genhd.c:704 __device_add_disk+0x10da/0x13d0 block/genhd.c:704 Kernel panic - not syncing: panic_on_warn set ... CPU: 1 PID: 16527 Comm: syz-executor0 Not tainted 4.20.0-rc1-next-20181108+ #108 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:969 RIP: 0010:__device_add_disk+0x10da/0x13d0 block/genhd.c:704 kobject: 'loop1' (000000003374b67e): kobject_uevent_env Code: 00 80 a3 dc 00 00 00 ef e9 63 f7 ff ff e8 be ed fe fd 0f 0b e9 db f7 ff ff e8 b2 ed fe fd 0f 0b e9 f7 f6 ff ff e8 a6 ed fe fd <0f> 0b e9 e5 fd ff ff 4c 89 f7 e8 17 46 42 fe e9 a3 f0 ff ff e8 9d RSP: 0018:ffff88017f6af870 EFLAGS: 00010246 RAX: 0000000000040000 RBX: ffff8801d97ef540 RCX: ffffc900022c6000 RDX: 0000000000040000 RSI: ffffffff8380ba9a RDI: 0000000000000005 kobject: 'loop1' (000000003374b67e): fill_kobj_path: path = '/devices/virtual/block/loop1' RBP: ffff88017f6afa48 R08: ffff8801b8b6a100 R09: ffffed003b5e5b67 R10: ffffed003b5e5b67 R11: ffff8801daf2db3b R12: ffff88017f6afa20 R13: 00000000fffffff4 R14: ffff8801d97efab0 R15: ffff8801d97ef544 device_add_disk+0x2a/0x40 block/genhd.c:726 add_disk include/linux/genhd.h:409 [inline] loop_add+0x755/0xa40 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: 0033:0x457569 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:00007fd2181ecc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007fd2181ecc90 RCX: 0000000000457569 RDX: 0000000000000000 RSI: 0000000000004c80 RDI: 0000000000000008 RBP: 000000000072bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007fd2181ed6d4 R13: 00000000004c0606 R14: 00000000004d0a30 R15: 000000000000000a Kernel Offset: disabled Rebooting in 86400 seconds..