------------[ cut here ]------------
WARNING: CPU: 0 PID: 5063 at kernel/kthread.c:87 free_kthread_struct+0xa2/0xe0 kernel/kthread.c:87
Kernel panic - not syncing: panic_on_warn set ...

CPU: 0 PID: 5063 Comm: syz-executor2 Not tainted 4.14.0-rc7-next-20171103+ #38
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 <IRQ>
 __dump_stack lib/dump_stack.c:17 [inline]
 dump_stack+0x194/0x257 lib/dump_stack.c:53
 panic+0x1e4/0x41c kernel/panic.c:183
 __warn+0x1c4/0x1e0 kernel/panic.c:546
 report_bug+0x211/0x2d0 lib/bug.c:184
 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:906
RIP: 0010:free_kthread_struct+0xa2/0xe0 kernel/kthread.c:87
RSP: 0018:ffff8801db207768 EFLAGS: 00010206
RAX: ffff8801c0cd8080 RBX: ffff8801d8e11280 RCX: ffffffff814937d2
RDX: 0000000000000100 RSI: 0000000000000000 RDI: ffff8801d8e11408
RBP: ffff8801db207770 R08: ffffffff85f3b680 R09: 1ffff1003b640ed4
R10: ffff8801c0cd8080 R11: 0000000000000002 R12: 1ffff1003b640ef0
R13: 1ffff1003b640ef4 R14: 0000000000000000 R15: ffff8801db2077e0
 free_task+0x134/0x1a0 kernel/fork.c:390
 __put_task_struct+0x229/0x3b0 kernel/fork.c:663
 put_task_struct include/linux/sched/task.h:96 [inline]
 delayed_put_task_struct+0xca/0x3d0 kernel/exit.c:180
 __rcu_reclaim kernel/rcu/rcu.h:172 [inline]
 rcu_do_batch kernel/rcu/tree.c:2676 [inline]
 invoke_rcu_callbacks kernel/rcu/tree.c:2935 [inline]
 __rcu_process_callbacks kernel/rcu/tree.c:2902 [inline]
 rcu_process_callbacks+0xd74/0x17d0 kernel/rcu/tree.c:2919
 __do_softirq+0x29d/0xbb2 kernel/softirq.c:284
 invoke_softirq kernel/softirq.c:364 [inline]
 irq_exit+0x1d3/0x210 kernel/softirq.c:405
 exiting_irq arch/x86/include/asm/apic.h:540 [inline]
 smp_apic_timer_interrupt+0x16b/0x700 arch/x86/kernel/apic/apic.c:1052
 apic_timer_interrupt+0x9d/0xb0 arch/x86/entry/entry_64.S:771
 </IRQ>
RIP: 0010:clear_page_erms+0x7/0x10 arch/x86/lib/clear_page_64.S:49
RSP: 0018:ffff8801d89576b0 EFLAGS: 00010246 ORIG_RAX: ffffffffffffff11
RAX: 0000000000000000 RBX: 0000000000000003 RCX: 0000000000000540
RDX: ffff8801c0cd8080 RSI: 0000160000000000 RDI: ffff88018e0d2ac0
RBP: ffff8801d8957700 R08: 0000000000029290 R09: 0000000000000000
R10: ffffffffffffffe8 R11: 0000000000000000 R12: ffffea0006380000
R13: 00000000000000d2 R14: dffffc0000000000 R15: ffffffff85309a80
 __do_huge_pmd_anonymous_page mm/huge_memory.c:570 [inline]
 do_huge_pmd_anonymous_page+0x59c/0x1b00 mm/huge_memory.c:728
 create_huge_pmd mm/memory.c:3828 [inline]
 __handle_mm_fault+0x1827/0x39c0 mm/memory.c:4031
 handle_mm_fault+0x334/0x8d0 mm/memory.c:4097
 __do_page_fault+0x5c9/0xc90 arch/x86/mm/fault.c:1449
 do_page_fault+0xee/0x720 arch/x86/mm/fault.c:1524
 page_fault+0x22/0x30 arch/x86/entry/entry_64.S:1067
RIP: 0033:0x439cf1
RSP: 002b:0000000000a6f948 EFLAGS: 00010202
RAX: 000000002026b000 RBX: 0000000000000002 RCX: 000000000000002f
RDX: 0000000000000009 RSI: 00000000007605f8 RDI: 000000002026b000
RBP: 0000000000000009 R08: 0000000000000000 R09: 0000000000000163
R10: 0000000000a6f910 R11: 0000000000000206 R12: fffffffffffffffe
R13: 000000002026b000 R14: 000000000000de0e R15: 0000000000000010
Dumping ftrace buffer:
   (ftrace buffer empty)
Kernel Offset: disabled
Rebooting in 86400 seconds..