RBP: 0000000000000047 R08: 0000000020a20000 R09: 0000000000000000
R10: 0000000020fa2ffc R11: 0000000000000212 R12: 00000000006ed748
R13: 0000000000000013 R14: 00007f4ae6b6f6d4 R15: ffffffffffffffff
kasan: CONFIG_KASAN_INLINE enabled
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: 1 PID: 8862 Comm: syz-executor6 Not tainted 4.15.0-rc1-next-20171201+ #57
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: 00000000e54a1a44 task.stack: 00000000bdf0c72f
RIP: 0010:invalidate_xhlock kernel/locking/lockdep.c:4719 [inline]
RIP: 0010:lockdep_invariant_state+0xd6/0x120 kernel/locking/lockdep.c:4793
RSP: 0018:ffff8801c763fe48 EFLAGS: 00010002
RAX: dffffc0000000000 RBX: 0000000000001d88 RCX: ffffffff81008dab
RDX: 00000000000003bc RSI: 0000000000000000 RDI: 0000000000001de0
RBP: ffff8801c763fe58 R08: 1ffffffff0d2b1db R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: ffff8801c763ff20 R14: ffff8801c763ff58 R15: ffff8801c91b24c0
FS:  00007f496a042700(0000) GS:ffff8801db500000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000002139cd8 CR3: 00000001d5616000 CR4: 00000000001406e0
DR0: 0000000020000000 DR1: 0000000020000000 DR2: 0000000020000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600
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:510
RIP: 0033:0x4529d9
RSP: 002b:0000000020295000 EFLAGS: 00000212 ORIG_RAX: 0000000000000038
RAX: 0000000000000000 RBX: 0000000000758020 RCX: 00000000004529d9
RDX: 0000000020758000 RSI: 0000000020295000 RDI: 0000000000000000
RBP: 0000000000000047 R08: 0000000020a20000 R09: 0000000000000000
R10: 0000000020fa2ffc R11: 0000000000000212 R12: 00000000006ed748
R13: 0000000000000013 R14: 00007f496a0426d4 R15: ffffffffffffffff
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: ffff8801c763fe48
RIP: lockdep_invariant_state+0xd6/0x120 kernel/locking/lockdep.c:4793 RSP: ffff8801c763fe48
---[ end trace cfd05a58d1bebe58 ]---
Kernel panic - not syncing: Fatal exception
Dumping ftrace buffer:
   (ftrace buffer empty)
Kernel Offset: disabled