RBP: 000000000078bf00 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000005
R13: 00000000000003ff R14: 00000000004c6c58 R15: 00007f368dcaf6d4
------------[ cut here ]------------
WARNING: CPU: 1 PID: 19169 at block/genhd.c:827 __device_add_disk+0xf7e/0x1200 block/genhd.c:827
Kernel panic - not syncing: panic_on_warn set ...
CPU: 1 PID: 19169 Comm: syz-executor.0 Not tainted 5.8.0-rc3-next-20200703-syzkaller #0
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+0x18f/0x20d lib/dump_stack.c:118
 panic+0x2e3/0x75c kernel/panic.c:231
 __warn.cold+0x20/0x45 kernel/panic.c:600
 report_bug+0x1bd/0x210 lib/bug.c:198
 handle_bug+0x38/0x90 arch/x86/kernel/traps.c:235
 exc_invalid_op+0x13/0x40 arch/x86/kernel/traps.c:255
 asm_exc_invalid_op+0x12/0x20 arch/x86/include/asm/idtentry.h:563
RIP: 0010:__device_add_disk+0xf7e/0x1200 block/genhd.c:827
Code: f1 ff ff e8 a4 8d ea fd 0f 0b e9 9f f8 ff ff 48 89 7c 24 10 e8 93 8d ea fd 0f 0b 48 8b 7c 24 10 e9 f3 f4 ff ff e8 82 8d ea fd <0f> 0b e9 8b fe ff ff 4c 89 ef e8 f3 2b 2a fe e9 dc f1 ff ff e8 69
RSP: 0018:ffffc90007a6fcd0 EFLAGS: 00010246
RAX: 0000000000040000 RBX: 0000000000000001 RCX: ffffc90001b19000
RDX: 0000000000040000 RSI: ffffffff8389797e RDI: 0000000000000005
RBP: ffff8880a2ec7000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 1ffff92000f4dfa3
R13: ffff8880a2ec7630 R14: ffff8880a2ec70a0 R15: ffff888096918000
 add_disk include/linux/genhd.h:294 [inline]
 loop_add+0x616/0x8b0 drivers/block/loop.c:2170
 loop_control_ioctl drivers/block/loop.c:2271 [inline]
 loop_control_ioctl+0x16c/0x480 drivers/block/loop.c:2253
 vfs_ioctl fs/ioctl.c:48 [inline]
 ksys_ioctl+0x11a/0x180 fs/ioctl.c:753
 __do_sys_ioctl fs/ioctl.c:762 [inline]
 __se_sys_ioctl fs/ioctl.c:760 [inline]
 __x64_sys_ioctl+0x6f/0xb0 fs/ioctl.c:760
 do_syscall_64+0x60/0xe0 arch/x86/entry/common.c:367
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x45cb29
Code: Bad RIP value.
RSP: 002b:00007f368dcaec78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00000000004e9660 RCX: 000000000045cb29
RDX: 0000000000000000 RSI: 0000000000004c80 RDI: 0000000000000003
RBP: 000000000078bf00 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000005
R13: 00000000000003ff R14: 00000000004c6c58 R15: 00007f368dcaf6d4
Kernel Offset: disabled
Rebooting in 86400 seconds..