WARNING: CPU: 1 PID: 6625 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: 6625 Comm: syz-executor6 Not tainted 4.14.0-rc5-next-20171018+ #8
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 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:ffff8800694c71a0 EFLAGS: 00010093
RAX: ffff88006805e1c0 RBX: 0000000000000000 RCX: ffffffff8162b8db
RDX: 0000000000000000 RSI: 0000000000000003 RDI: ffff8800692c0300
RBP: ffff8800694c7230 R08: 0000000000000001 R09: 1ffff1000d298e26
R10: ffff8800694c70f8 R11: 0000000000000002 R12: 1ffff1000d298e35
R13: ffff8800692c0300 R14: 1ffff1000d298e39 R15: ffff8800692c03b0
 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: 0033:0x447c89
RSP: 002b:00007fb883929bd8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: 0000000000000000 RBX: 00007fb88392a6cc RCX: 0000000000447c89
RDX: 0000000000000004 RSI: 000080000000000b RDI: 000000002000cffc
RBP: 00000000007480d8 R08: 0000000020048000 R09: 0000000000000000
R10: 000000002000b000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 0000000000000d08 R14: 00000000006e4da8 R15: 00007fb88392a700
Dumping ftrace buffer:
   (ftrace buffer empty)
Kernel Offset: disabled
Rebooting in 86400 seconds..