ODEBUG: object ffff8801db307ce8 is NOT on stack ffff8801b0be0000, but annotated
------------[ cut here ]------------
WARNING: CPU: 1 PID: 3837 at lib/debugobjects.c:303 debug_object_is_on_stack lib/debugobjects.c:303 [inline]
WARNING: CPU: 1 PID: 3837 at lib/debugobjects.c:303 __debug_object_init.cold.10+0x6b/0x2b0 lib/debugobjects.c:329
Kernel panic - not syncing: panic_on_warn set ...

CPU: 1 PID: 3837 Comm: syz-executor2 Not tainted 4.9.124-g09eb2ba #35
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
 ffff8801db307a18 ffffffff81eb95e9 ffffffff83c48ac0 00000000ffffffff
 0000000000000000 0000000000000001 000000000000012f ffff8801db307ad8
 ffffffff81423eb5 0000000041b58ab3 ffffffff843bb8e8 ffffffff81423cf6
Call Trace:
 <IRQ> [   68.990856]  [<ffffffff81eb95e9>] __dump_stack lib/dump_stack.c:15 [inline]
 <IRQ> [   68.990856]  [<ffffffff81eb95e9>] dump_stack+0xc1/0x128 lib/dump_stack.c:51
 [<ffffffff81423eb5>] panic+0x1bf/0x3bc kernel/panic.c:179
 [<ffffffff814241a1>] __warn.cold.9+0xc1/0x17f kernel/panic.c:542
 [<ffffffff811383bc>] warn_slowpath_null+0x2c/0x40 kernel/panic.c:585
 [<ffffffff81f6f137>] debug_object_is_on_stack lib/debugobjects.c:303 [inline]
 [<ffffffff81f6f137>] __debug_object_init.cold.10+0x6b/0x2b0 lib/debugobjects.c:329
 [<ffffffff81f23069>] debug_object_init_on_stack+0x19/0x20 lib/debugobjects.c:381
 [<ffffffff8127dfaa>] init_rcu_head_on_stack kernel/rcu/update.c:403 [inline]
 [<ffffffff8127dfaa>] __wait_rcu_gp+0x8a/0x1b0 kernel/rcu/update.c:358
 [<ffffffff812862ea>] synchronize_rcu.part.62+0xfa/0x110 kernel/rcu/tree_plugin.h:684
 [<ffffffff81286327>] synchronize_rcu+0x27/0x90 kernel/rcu/tree_plugin.h:685
 [<ffffffff836c4baa>] __l2tp_session_unhash+0x38a/0x520 net/l2tp/l2tp_core.c:1796
 [<ffffffff836c4f37>] l2tp_tunnel_closeall+0x1f7/0x350 net/l2tp/l2tp_core.c:1364
 [<ffffffff836c57f2>] l2tp_tunnel_destruct+0x2f2/0x590 net/l2tp/l2tp_core.c:1324
 [<ffffffff830281f5>] __sk_destruct+0x55/0x590 net/core/sock.c:1428
 [<ffffffff812899ee>] __rcu_reclaim kernel/rcu/rcu.h:118 [inline]
 [<ffffffff812899ee>] rcu_do_batch kernel/rcu/tree.c:2789 [inline]
 [<ffffffff812899ee>] invoke_rcu_callbacks kernel/rcu/tree.c:3053 [inline]
 [<ffffffff812899ee>] __rcu_process_callbacks kernel/rcu/tree.c:3020 [inline]
 [<ffffffff812899ee>] rcu_process_callbacks+0x8ae/0x12b0 kernel/rcu/tree.c:3037
 [<ffffffff83a085c0>] __do_softirq+0x210/0x940 kernel/softirq.c:288
 [<ffffffff8114d554>] invoke_softirq kernel/softirq.c:368 [inline]
 [<ffffffff8114d554>] irq_exit+0x114/0x150 kernel/softirq.c:409
 [<ffffffff83a071a1>] exiting_irq arch/x86/include/asm/apic.h:669 [inline]
 [<ffffffff83a071a1>] smp_apic_timer_interrupt+0x81/0xa0 arch/x86/kernel/apic/apic.c:962
 [<ffffffff83a03330>] apic_timer_interrupt+0xa0/0xb0 arch/x86/entry/entry_64.S:648
 <EOI> [   69.208215]  [<ffffffff83a0164e>] ? arch_local_irq_enable arch/x86/include/asm/paravirt.h:778 [inline]
 <EOI> [   69.208215]  [<ffffffff83a0164e>] ? __raw_spin_unlock_irq include/linux/spinlock_api_smp.h:170 [inline]
 <EOI> [   69.208215]  [<ffffffff83a0164e>] ? _raw_spin_unlock_irq+0x2e/0x50 kernel/locking/spinlock.c:199
 [<ffffffff811bd0fd>] finish_lock_switch kernel/sched/sched.h:1211 [inline]
 [<ffffffff811bd0fd>] finish_task_switch+0x1ed/0x640 kernel/sched/core.c:2821
 [<ffffffff839f0b05>] context_switch kernel/sched/core.c:2954 [inline]
 [<ffffffff839f0b05>] __schedule+0x655/0x1bd0 kernel/sched/core.c:3498
 [<ffffffff839f20ff>] schedule+0x7f/0x1b0 kernel/sched/core.c:3553
 [<ffffffff839ff055>] freezable_schedule include/linux/freezer.h:171 [inline]
 [<ffffffff839ff055>] do_nanosleep+0x1f5/0x4d0 kernel/time/hrtimer.c:1497
 [<ffffffff812a8520>] hrtimer_nanosleep+0x210/0x540 kernel/time/hrtimer.c:1566
 [<ffffffff812fdcbe>] C_SYSC_nanosleep kernel/compat.c:254 [inline]
 [<ffffffff812fdcbe>] compat_SyS_nanosleep+0x27e/0x390 kernel/compat.c:239
 [<ffffffff81006da7>] do_syscall_32_irqs_on arch/x86/entry/common.c:325 [inline]
 [<ffffffff81006da7>] do_fast_syscall_32+0x2f7/0x870 arch/x86/entry/common.c:387
 [<ffffffff83a030d0>] entry_SYSENTER_compat+0x90/0xa2 arch/x86/entry/entry_64_compat.S:137
Dumping ftrace buffer:
   (ftrace buffer empty)
Kernel Offset: disabled
Rebooting in 86400 seconds..