------------[ cut here ]------------
WARNING: CPU: 1 PID: 15071 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: 15071 Comm: syz-executor0 Not tainted 4.14.0-rc2-mm1+ #9
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:ffff8801d8d671a8 EFLAGS: 00010297
RAX: ffff8801d52bc280 RBX: 0000000000000000 RCX: 1ffff1003b1ace3a
RDX: 0000000000000000 RSI: 1ffff1003aa57969 RDI: ffff8801c3199300
RBP: ffff8801d8d67238 R08: ffff8801d52bd540 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 1ffff1003b1ace36
R13: ffff8801c3199300 R14: 1ffff1003b1ace3a R15: ffff8801c31993c0
 exit_pi_state_list+0x543/0x780 kernel/futex.c:927
 mm_release+0x46d/0x590 kernel/fork.c:1172
 exit_mm kernel/exit.c:499 [inline]
 do_exit+0x481/0x1b00 kernel/exit.c:852
 do_group_exit+0x149/0x400 kernel/exit.c:968
 get_signal+0x73f/0x16d0 kernel/signal.c:2334
 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: 0033:0x4520a9
RSP: 002b:00007fca1cf26c08 EFLAGS: 00000216 ORIG_RAX: 00000000000000ca
RAX: 0000000000000000 RBX: 00000000007180b0 RCX: 00000000004520a9
RDX: 0000000000000004 RSI: 000080000000000b RDI: 000000002000cffc
RBP: 00000000000008f0 R08: 0000000020048000 R09: 0000000000000000
R10: 0000000020edfff0 R11: 0000000000000216 R12: 00000000004b77c8
R13: 00000000ffffffff R14: 000000002000cffc R15: 000080000000000b
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: 0 PID: 15060 Comm: syz-executor0 Not tainted 4.14.0-rc2-mm1+ #9
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff8801c1a54300 task.stack: ffff8801cbc48000
RIP: 0010:cross_lock kernel/locking/lockdep.c:4796 [inline]
RIP: 0010:lock_release_crosslock kernel/locking/lockdep.c:5111 [inline]
RIP: 0010:__lock_release kernel/locking/lockdep.c:3751 [inline]
RIP: 0010:lock_release+0x233/0xd70 kernel/locking/lockdep.c:4021
RSP: 0018:ffff8801cbc4ef40 EFLAGS: 00010006
RAX: dffffc0000000000 RBX: 1ffff10039789ded RCX: 1ffff10038633261
RDX: 0000000000000103 RSI: 0000000000000001 RDI: 0000000000000818
RBP: ffff8801cbc4f0f0 R08: 1ffff10038633261 R09: ffff8801cbc4ea60
R10: ffff8801c1a54300 R11: 1ffff1003834aaf3 R12: ffff8801cbc4efc8
R13: ffff8801cbc4f0c8 R14: 00000000000007f8 R15: ffffffff85cc8a80
FS:  00007fca1cf48700(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000a6fa18 CR3: 00000001d02bf000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 __raw_spin_unlock_irq include/linux/spinlock_api_smp.h:166 [inline]
 _raw_spin_unlock_irq+0x1a/0x70 kernel/locking/spinlock.c:199
 put_pi_state+0x252/0x520 kernel/futex.c:842
 exit_pi_state_list+0x55c/0x780 kernel/futex.c:931
 mm_release+0x46d/0x590 kernel/fork.c:1172
 exit_mm kernel/exit.c:499 [inline]
 do_exit+0x481/0x1b00 kernel/exit.c:852
 do_group_exit+0x149/0x400 kernel/exit.c:968
 get_signal+0x73f/0x16d0 kernel/signal.c:2334
 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: 0033:0x4520a9