------------[ cut here ]------------
WARNING: CPU: 0 PID: 4007 at kernel/futex.c:818 get_pi_state+0x15b/0x190 kernel/futex.c:818
Kernel panic - not syncing: panic_on_warn set ...

CPU: 0 PID: 4007 Comm: syz-executor4 Not tainted 4.14.0-rc5-next-20171018+ #36
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:16 [inline]
 dump_stack+0x194/0x257 lib/dump_stack.c:52
 panic+0x1e4/0x41c kernel/panic.c:183
 __warn+0x1c4/0x1e0 kernel/panic.c:546
 report_bug+0x211/0x2d0 lib/bug.c:183
 fixup_bug+0x40/0x90 arch/x86/kernel/traps.c:177
 do_trap_no_signal arch/x86/kernel/traps.c:211 [inline]
 do_trap+0x260/0x390 arch/x86/kernel/traps.c:260
 do_error_trap+0x120/0x390 arch/x86/kernel/traps.c:297
 do_invalid_op+0x1b/0x20 arch/x86/kernel/traps.c:310
 invalid_op+0x18/0x20 arch/x86/entry/entry_64.S:905
RIP: 0010:get_pi_state+0x15b/0x190 kernel/futex.c:818
RSP: 0018:ffff8801c27671a0 EFLAGS: 00010093
RAX: ffff8801c14dc500 RBX: 0000000000000000 RCX: ffffffff8162b8db
RDX: 0000000000000000 RSI: 0000000000000003 RDI: ffff8801c3cfdcc0
RBP: ffff8801c2767230 R08: 0000000000000001 R09: 1ffff100384ece26
R10: ffff8801c27670f8 R11: 0000000000000002 R12: 1ffff100384ece35
R13: ffff8801c3cfdcc0 R14: 1ffff100384ece39 R15: ffff8801c3cfdd70
 exit_pi_state_list+0x556/0x7a0 kernel/futex.c:932
 mm_release+0x46d/0x590 kernel/fork.c:1186
 exit_mm kernel/exit.c:499 [inline]
 do_exit+0x481/0x1ad0 kernel/exit.c:856
 do_group_exit+0x149/0x400 kernel/exit.c:972
 get_signal+0x73f/0x16d0 kernel/signal.c:2333
 do_signal+0x94/0x1ee0 arch/x86/kernel/signal.c:808
 exit_to_usermode_loop+0x214/0x310 arch/x86/entry/common.c:158
 prepare_exit_to_usermode arch/x86/entry/common.c:197 [inline]
 syscall_return_slowpath+0x42f/0x510 arch/x86/entry/common.c:266
 entry_SYSCALL_64_fastpath+0xbc/0xbe
RIP: 0033:0x452719
RSP: 002b:00007fe2019a8be8 EFLAGS: 00000212 ORIG_RAX: 00000000000000ca
RAX: 0000000000000000 RBX: 00000000007580d8 RCX: 0000000000452719
RDX: 0000000000000004 RSI: 000080000000000b RDI: 000000002000cffc
RBP: 000000000000008f R08: 0000000020048000 R09: 0000000000000000
R10: 0000000020edfff0 R11: 0000000000000212 R12: 00000000006eee08
R13: 00000000ffffffff R14: 00007fe2019a96d4 R15: 0000000000000006
Shutting down cpus with NMI
Dumping ftrace buffer:
   (ftrace buffer empty)
Kernel Offset: disabled
Rebooting in 86400 seconds..