WARNING: CPU: 1 PID: 2367 at kernel/futex.c:818 get_pi_state+0x15b/0x190 kernel/futex.c:818
Kernel panic - not syncing: panic_on_warn set ...

CPU: 1 PID: 2367 Comm: syzkaller243841 Not tainted 4.14.0-rc7+ #157
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+0x1e4/0x417 kernel/panic.c:181
 __warn+0x1c4/0x1d9 kernel/panic.c:542
 report_bug+0x211/0x2d0 lib/bug.c:183
 fixup_bug+0x40/0x90 arch/x86/kernel/traps.c:178
 do_trap_no_signal arch/x86/kernel/traps.c:212 [inline]
 do_trap+0x260/0x390 arch/x86/kernel/traps.c:261
 do_error_trap+0x120/0x390 arch/x86/kernel/traps.c:298
 do_invalid_op+0x1b/0x20 arch/x86/kernel/traps.c:311
 invalid_op+0x18/0x20 arch/x86/entry/entry_64.S:905
RIP: 0010:get_pi_state+0x15b/0x190 kernel/futex.c:818
RSP: 0018:ffff8801cb6977a8 EFLAGS: 00010097
RAX: ffff8801d6670680 RBX: 0000000000000000 RCX: 1ffff100396d2efa
RDX: 0000000000000000 RSI: 0000000000000003 RDI: ffff8801d841d940
RBP: ffff8801cb697838 R08: 0000000000000001 R09: 1ffff100396d2ee7
R10: ffff8801cb697700 R11: 0000000000000002 R12: 1ffff100396d2ef6
R13: ffff8801d841d940 R14: 1ffff100396d2efa R15: ffff8801d841d9f0
 exit_pi_state_list+0x556/0x7a0 kernel/futex.c:932
 mm_release+0x46d/0x590 kernel/fork.c:1148
 exit_mm kernel/exit.c:499 [inline]
 do_exit+0x481/0x1ad0 kernel/exit.c:852
 SYSC_exit kernel/exit.c:937 [inline]
 SyS_exit+0x22/0x30 kernel/exit.c:935
 entry_SYSCALL_64_fastpath+0x1f/0xbe
RIP: 0033:0x40468e
RSP: 002b:00007ffb3a3e8d20 EFLAGS: 00000246 ORIG_RAX: 000000000000003c
RAX: ffffffffffffffda RBX: 00007ffb3a3e9700 RCX: 000000000040468e
RDX: 000000000000003c RSI: 00000000007fb000 RDI: 0000000000000000
RBP: 0000000000000082 R08: 0000000020048000 R09: 0000000000000000
R10: 000000002000b000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffe39110ebf R14: 00007ffb3a3e99c0 R15: 0000000000000000