RAX: ffffffffffffffda RBX: 00007fc746a7f6d4 RCX: 0000000000455e29 RDX: 0000000000000000 RSI: 0000000000004c80 RDI: 0000000000000014 RBP: 000000000072bea0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000015 R13: 00000000004be3c0 R14: 00000000004ccd10 R15: 000000000000002e WARNING: CPU: 1 PID: 14132 at block/genhd.c:697 __device_add_disk+0x106a/0x1360 block/genhd.c:697 Kernel panic - not syncing: panic_on_warn set ... CPU: 1 PID: 14132 Comm: syz-executor7 Not tainted 4.18.0-rc4-next-20180711+ #4 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+0x1c9/0x2b4 lib/dump_stack.c:113 panic+0x238/0x4e7 kernel/panic.c:184 __warn.cold.8+0x163/0x1ba kernel/panic.c:536 report_bug+0x252/0x2d0 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:996 RIP: 0010:__device_add_disk+0x106a/0x1360 block/genhd.c:697 Code: ff ff 48 89 df e8 a6 74 68 fe e9 c9 f0 ff ff e8 1c 75 68 fe e9 83 f4 ff ff e8 22 f0 29 fe 0f 0b e9 52 fb ff ff e8 16 f0 29 fe <0f> 0b e9 cb fe ff ff 4c 89 f7 e8 f7 74 68 fe e9 0c f1 ff ff e8 dd RSP: 0018:ffff880193107888 EFLAGS: 00010246 RAX: 0000000000040000 RBX: ffff8801aa2f6b00 RCX: ffffc90001e14000 RDX: 0000000000040000 RSI: ffffffff8352885a RDI: 0000000000000005 RBP: ffff880193107a58 R08: ffff8801abc8a540 R09: fffffbfff1256a28 R10: fffffbfff1256a28 R11: ffffffff892b5143 R12: 00000000fffffff4 R13: ffff880193107a30 R14: ffff8801aa2f7060 R15: ffff8801aa2f6b04 device_add_disk+0x22/0x30 block/genhd.c:717 add_disk include/linux/genhd.h:399 [inline] loop_add+0x71d/0x9d0 drivers/block/loop.c:1909 loop_control_ioctl+0x199/0x540 drivers/block/loop.c:2006 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:501 [inline] do_vfs_ioctl+0x1de/0x1720 fs/ioctl.c:685 ksys_ioctl+0xa9/0xd0 fs/ioctl.c:702 __do_sys_ioctl fs/ioctl.c:709 [inline] __se_sys_ioctl fs/ioctl.c:707 [inline] __x64_sys_ioctl+0x73/0xb0 fs/ioctl.c:707 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x455e29 Code: 1d ba 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 eb b9 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007fc746a7ec68 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007fc746a7f6d4 RCX: 0000000000455e29 RDX: 0000000000000000 RSI: 0000000000004c80 RDI: 0000000000000014 RBP: 000000000072bea0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000015 R13: 00000000004be3c0 R14: 00000000004ccd10 R15: 000000000000002e Dumping ftrace buffer: (ftrace buffer empty) Kernel Offset: disabled Rebooting in 86400 seconds..