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WARNING: CPU: 1 PID: 3675 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: 3675 Comm: blkid Not tainted 4.14.0-rc4-next-20171009+ #33
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: 0000000000000100 RBX: ffff8801c54e6780 RCX: 1ffff1003b660ee1
RDX: ffff8801c5324100 RSI: 0000000000000000 RDI: ffff8801c54e6908
RBP: ffff8801db307770 R08: ffffffff8593c5c0 R09: 1ffff1003b660ed4
R10: ffff8801c5324100 R11: 0000000000000003 R12: 1ffff1003b660ef0
R13: 1ffff1003b660ef4 R14: 0000000000000000 R15: ffff8801db3077e0
 free_task+0x134/0x1a0 kernel/fork.c:386
 __put_task_struct+0x229/0x3b0 kernel/fork.c:665
 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:2691 [inline]
 invoke_rcu_callbacks kernel/rcu/tree.c:2945 [inline]
 __rcu_process_callbacks kernel/rcu/tree.c:2912 [inline]
 rcu_process_callbacks+0xd74/0x17d0 kernel/rcu/tree.c:2929
 __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:qlink_free mm/kasan/quarantine.c:150 [inline]
RIP: 0010:qlist_free_all+0xa9/0x160 mm/kasan/quarantine.c:166
RSP: 0000:ffff8801c52bf850 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff11
RAX: 0000000000000007 RBX: 0000000000000282 RCX: 0000000000000006
RDX: 0000000000000000 RSI: ffff8801c53249c8 RDI: 0000000000000282
RBP: ffff8801c52bf888 R08: ffff88021fffae78 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: ffff8801dae3e780 R14: ffff8801c4c90d00 R15: ffffffff858cb820
 quarantine_reduce+0x141/0x170 mm/kasan/quarantine.c:259
 kasan_kmalloc+0xca/0xe0 mm/kasan/kasan.c:536
 kasan_slab_alloc+0x12/0x20 mm/kasan/kasan.c:489
 kmem_cache_alloc+0x12e/0x760 mm/slab.c:3562
 ptlock_alloc+0x24/0x70 mm/memory.c:4698
 ptlock_init include/linux/mm.h:1759 [inline]
 pgtable_page_ctor include/linux/mm.h:1793 [inline]
 pte_alloc_one+0x59/0x100 arch/x86/mm/pgtable.c:31
 __pte_alloc+0x2a/0x300 mm/memory.c:648
 do_anonymous_page mm/memory.c:3110 [inline]
 handle_pte_fault mm/memory.c:3945 [inline]
 __handle_mm_fault+0x2a8d/0x39c0 mm/memory.c:4071
 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: 0033:0x7f6d5f7b11e5
RSP: 002b:00007ffdd49dffa0 EFLAGS: 00010202
RAX: 0000000000000000 RBX: 0000000000021001 RCX: 000000000232e000
RDX: 0000000000000000 RSI: 0000000000000008 RDI: 0000000000000000
RBP: 00007f6d5fac0e40 R08: 00007f6d5fac0e40 R09: 00007f6d5f73bc60
R10: 0000000000091a20 R11: 0000000000000206 R12: 00007f6d5fac0e98
R13: 0000000000000000 R14: 00007f6d5fabfda0 R15: 000000000234f000
Dumping ftrace buffer:
   (ftrace buffer empty)
Kernel Offset: disabled
Rebooting in 86400 seconds..