------------[ cut here ]------------
WARNING: CPU: 1 PID: 6476 at kernel/kthread.c:87 free_kthread_struct+0xa2/0xe0 kernel/kthread.c:87
Kernel panic - not syncing: panic_on_warn set ...

CPU: 1 PID: 6476 Comm: syz-executor7 Not tainted 4.14.0-rc3-mm1+ #13
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 <IRQ>
 __dump_stack lib/dump_stack.c:16 [inline]
 dump_stack+0x194/0x257 lib/dump_stack.c:52
 panic+0x1e4/0x41c kernel/panic.c:181
 __warn+0x1c4/0x1e0 kernel/panic.c:544
 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:free_kthread_struct+0xa2/0xe0 kernel/kthread.c:87
RSP: 0000:ffff8801db307768 EFLAGS: 00010206
RAX: 0000000080000100 RBX: ffff8801d790e300 RCX: 1ffff1003b660ee1
RDX: ffff8801d81ea1c0 RSI: 0000000000000000 RDI: ffff8801d790e488
RBP: ffff8801db307770 R08: 0000000000000000 R09: 1ffff1003b660ed4
R10: ffff8801d81ea1c0 R11: 0000000000000002 R12: 1ffff1003b660ef0
R13: 1ffff1003b660ef4 R14: 0000000000000000 R15: ffff8801db3077e0
 free_task+0x134/0x1a0 kernel/fork.c:386
 __put_task_struct+0x229/0x3b0 kernel/fork.c:670
 put_task_struct include/linux/sched/task.h:95 [inline]
 delayed_put_task_struct+0xca/0x3d0 kernel/exit.c:180
 __rcu_reclaim kernel/rcu/rcu.h:195 [inline]
 rcu_do_batch kernel/rcu/tree.c:2758 [inline]
 invoke_rcu_callbacks kernel/rcu/tree.c:3012 [inline]
 __rcu_process_callbacks kernel/rcu/tree.c:2979 [inline]
 rcu_process_callbacks+0xd74/0x17d0 kernel/rcu/tree.c:2996
 __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:1041
 apic_timer_interrupt+0x9d/0xb0 arch/x86/entry/entry_64.S:770
 </IRQ>
RIP: 0010:arch_local_irq_restore arch/x86/include/asm/paravirt.h:777 [inline]
RIP: 0010:rmqueue_pcplist mm/page_alloc.c:2812 [inline]
RIP: 0010:rmqueue mm/page_alloc.c:2829 [inline]
RIP: 0010:get_page_from_freelist+0x8ec/0x3420 mm/page_alloc.c:3178
RSP: 0000:ffff8801c112edc0 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff11
RAX: 1ffffffff0b5970d RBX: ffff8801db329350 RCX: 0000000000000006
RDX: 0000000000000000 RSI: 1ffff1003b03d551 RDI: 0000000000000286
RBP: ffff8801c112f4a8 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: ffffea00073f7cc0 R12: ffffea00073f7cc0
R13: dffffc0000000000 R14: 0000000000000000 R15: ffff8801c112f480
 __alloc_pages_nodemask+0x588/0xd80 mm/page_alloc.c:4203
 alloc_pages_current+0xb6/0x1e0 mm/mempolicy.c:2038
 alloc_pages include/linux/gfp.h:505 [inline]
 pte_alloc_one+0x19/0x100 arch/x86/mm/pgtable.c:28
 __do_huge_pmd_anonymous_page mm/huge_memory.c:564 [inline]
 do_huge_pmd_anonymous_page+0x554/0x1b00 mm/huge_memory.c:728
 create_huge_pmd mm/memory.c:3839 [inline]
 __handle_mm_fault+0x1827/0x39c0 mm/memory.c:4042
 handle_mm_fault+0x334/0x8d0 mm/memory.c:4108
 __do_page_fault+0x5bd/0xd60 arch/x86/mm/fault.c:1444
 do_page_fault+0xee/0x720 arch/x86/mm/fault.c:1520
 page_fault+0x22/0x30 arch/x86/entry/entry_64.S:1066
RIP: 0033:0x4053c7
RSP: 002b:0000000000a6f8e0 EFLAGS: 00010246
RAX: 0000000020223fd4 RBX: 000000000000000a RCX: 000000000000000a
RDX: a88ec73d8c3ab487 RSI: 0000000000000000 RDI: 0000000001be0848
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000320
R10: 0000000000a6f980 R11: 0000000000000206 R12: fffffffffffffffe
R13: 0000000000718000 R14: 0000000020223fd4 R15: 0000000000000010
Dumping ftrace buffer:
   (ftrace buffer empty)
Kernel Offset: disabled
Rebooting in 86400 seconds..