------------[ cut here ]------------
WARNING: CPU: 2 PID: 4532 at kernel/futex.c:818 get_pi_state+0x15b/0x190 kernel/futex.c:818
Kernel panic - not syncing: panic_on_warn set ...

CPU: 2 PID: 4532 Comm: syz-executor6 Not tainted 4.13.0-rc7-next-20170831+ #12
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+0x1e4/0x417 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:ffff88006cf47088 EFLAGS: 00010297
RAX: ffff88006cf6c2c0 RBX: 0000000000000000 RCX: 1ffff1000d9e8e16
RDX: 0000000000000000 RSI: 1ffff1000d9ed96f RDI: ffff88006d1f6280
RBP: ffff88006cf47118 R08: ffff88006cf6caa8 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 1ffff1000d9e8e12
R13: ffff88006d1f6280 R14: 1ffff1000d9e8e16 R15: ffff88006d1f6340
 exit_pi_state_list+0x543/0x780 kernel/futex.c:927
 mm_release+0x46d/0x590 kernel/fork.c:1118
 exit_mm kernel/exit.c:499 [inline]
 do_exit+0x481/0x1b40 kernel/exit.c:852
 do_group_exit+0x149/0x400 kernel/exit.c:968
 get_signal+0x7e8/0x17e0 kernel/signal.c:2334
 do_signal+0x94/0x1ee0 arch/x86/kernel/signal.c:808
 exit_to_usermode_loop+0x224/0x300 arch/x86/entry/common.c:158
 prepare_exit_to_usermode arch/x86/entry/common.c:197 [inline]
 syscall_return_slowpath+0x42f/0x500 arch/x86/entry/common.c:266
 entry_SYSCALL_64_fastpath+0xbc/0xbe
RIP: 0033:0x447299
RSP: 002b:00007f5c2b480c08 EFLAGS: 00000282 ORIG_RAX: 00000000000000ca
RAX: 0000000000000000 RBX: 000000002000cffc RCX: 0000000000447299
RDX: 0000000000000004 RSI: 000080000000000b RDI: 000000002000cffc
RBP: 00000000007080b0 R08: 0000000020048000 R09: 0000000000020000
R10: 0000000020edfff0 R11: 0000000000000282 R12: 00000000ffffffff
R13: 0000000000000800 R14: 00000000006e28c0 R15: 000080000000000b
Dumping ftrace buffer:
   (ftrace buffer empty)
Kernel Offset: disabled
Rebooting in 86400 seconds..