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: 2 PID: 19463 Comm: syz-executor0 Not tainted 4.13.0-rc7-next-20170831+ #12
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011
task: ffff88006a16a200 task.stack: ffff880069500000
RIP: 0010:invalidate_xhlock kernel/locking/lockdep.c:4717 [inline]
RIP: 0010:lockdep_invariant_state+0xd6/0x120 kernel/locking/lockdep.c:4791
RSP: 0018:ffff880069507e38 EFLAGS: 00010002
RAX: dffffc0000000000 RBX: 0000000000001d88 RCX: 0000000000000000
RDX: 00000000000003bc RSI: 0000000000000000 RDI: 0000000000001de0
RBP: ffff880069507e48 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: ffff880069507ee0 R14: ffff88006a16a200 R15: ffffffff85ac96f0
FS:  00007fea1d435700(0000) GS:ffff88006de00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000002085e000 CR3: 0000000057143000 CR4: 00000000000026e0
Call Trace:
 lockdep_sys_exit+0x47/0xf0 kernel/locking/lockdep.c:4627
 prepare_exit_to_usermode arch/x86/entry/common.c:192 [inline]
 syscall_return_slowpath+0x244/0x500 arch/x86/entry/common.c:266
 ret_from_fork+0x15/0x40 arch/x86/entry/entry_64.S:423
RIP: 0033:0x447299
RSP: 002b:0000000020000000 EFLAGS: 00000282 ORIG_RAX: 0000000000000038
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000447299
RDX: 0000000020000ffc RSI: 0000000020000000 RDI: 0000000000000000
RBP: 0000000000708000 R08: 0000000020000000 R09: 0000000000000000
R10: 0000000020001000 R11: 0000000000000282 R12: 0000000000000005
R13: 00000000000003b0 R14: 00000000006e2470 R15: 0000000020000000
Code: 83 a0 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:4717 [inline] RSP: ffff880069507e38
RIP: lockdep_invariant_state+0xd6/0x120 kernel/locking/lockdep.c:4791 RSP: ffff880069507e38
---[ end trace 0349ff10d6bb4970 ]---
Kernel panic - not syncing: Fatal exception
Dumping ftrace buffer:
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Kernel Offset: disabled