kasan: GPF could be caused by NULL-ptr deref or user memory access
general protection fault: 0000 [#1] SMP KASAN
Dumping ftrace buffer:
   (ftrace buffer empty)
Modules linked in:
CPU: 0 PID: 23327 Comm: syz-executor7 Not tainted 4.15.0-rc1+ #114
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: 00000000a6e58703 task.stack: 00000000727bdba8
RIP: 0010:invalidate_xhlock kernel/locking/lockdep.c:4719 [inline]
RIP: 0010:lockdep_invariant_state+0xd6/0x120 kernel/locking/lockdep.c:4793
RSP: 0018:ffff8801c71b7e48 EFLAGS: 00010002
RAX: dffffc0000000000 RBX: 0000000000001d88 RCX: ffffffff81008dab
RDX: 00000000000003bc RSI: 0000000000000000 RDI: 0000000000001de0
RBP: ffff8801c71b7e58 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: ffff8801c71b7f20 R14: ffff8801c71b7f58 R15: ffff8801d138a100
FS:  0000000000000000(0000) GS:ffff8801db400000(0063) knlGS:00000000f775bb40
CS:  0010 DS: 002b ES: 002b CR0: 0000000080050033
CR2: 0000000008d3e968 CR3: 00000001d28c3000 CR4: 00000000001406f0
Call Trace:
 lockdep_sys_exit+0x47/0xf0 kernel/locking/lockdep.c:4629
 prepare_exit_to_usermode arch/x86/entry/common.c:190 [inline]
 syscall_return_slowpath+0x240/0x550 arch/x86/entry/common.c:264
 ret_from_fork+0x15/0x30 arch/x86/entry/entry_64.S:434
RIP: 0023:0xf7f5fc79
RSP: 002b:00000000209a9000 EFLAGS: 00000296 ORIG_RAX: 0000000000000078
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 00000000209a9000
RDX: 0000000020ea9ffc RSI: 0000000020bf2ffc RDI: 00000000203c2000
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
Code: 83 90 11 00 00 83 e0 3f 48 89 c2 48 c1 e2 04 48 29 c2 48 b8 00 00 00 00 00 fc ff df 49 8d 1c d4 48 8d 7b 58 48 89 fa 48 c1 ea 03 <80> 3c 02 00 75 2f 48 c7 43 58 00 00 00 00 5b 41 5c 5d c3 0f ff 
RIP: invalidate_xhlock kernel/locking/lockdep.c:4719 [inline] RSP: ffff8801c71b7e48
RIP: lockdep_invariant_state+0xd6/0x120 kernel/locking/lockdep.c:4793 RSP: ffff8801c71b7e48
---[ end trace db094b3f10ffe85a ]---
Kernel panic - not syncing: Fatal exception
Dumping ftrace buffer:
   (ftrace buffer empty)
Kernel Offset: disabled
Rebooting in 86400 seconds..