ODEBUG: object ffff8801db207d20 is NOT on stack ffff8801a1230000, but annotated
------------[ cut here ]------------
WARNING: CPU: 0 PID: 19531 at lib/debugobjects.c:303 debug_object_is_on_stack lib/debugobjects.c:303 [inline]
WARNING: CPU: 0 PID: 19531 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: 0 PID: 19531 Comm: syz-executor0 Not tainted 4.9.124-g09eb2ba #83
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
 ffff8801db207a50 ffffffff81eb95e9 ffffffff83c48ac0 00000000ffffffff
 0000000000000000 0000000000000000 000000000000012f ffff8801db207b10
 ffffffff81423eb5 0000000041b58ab3 ffffffff843bb8e8 ffffffff81423cf6
Call Trace:
 <IRQ> [  305.627229]  [<ffffffff81eb95e9>] __dump_stack lib/dump_stack.c:15 [inline]
 <IRQ> [  305.627229]  [<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
binder_alloc: binder_alloc_mmap_handler: 19455 20001000-20004000 already mapped failed -16
 [<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
 [<ffffffff83a029dc>] do_softirq_own_stack+0x1c/0x30 arch/x86/entry/entry_64.S:843
 <EOI> [  305.841284]  [<ffffffff8114bb52>] do_softirq.part.14+0x62/0x70 kernel/softirq.c:332
 [<ffffffff8114bc28>] do_softirq arch/x86/include/asm/preempt.h:22 [inline]
 [<ffffffff8114bc28>] __local_bh_enable_ip+0xc8/0xd0 kernel/softirq.c:185
 [<ffffffff836cf8c6>] local_bh_enable include/linux/bottom_half.h:31 [inline]
 [<ffffffff836cf8c6>] pppol2tp_sendmsg+0x4f6/0x790 net/l2tp/l2tp_ppp.c:340
 [<ffffffff8301e0ac>] sock_sendmsg_nosec net/socket.c:648 [inline]
 [<ffffffff8301e0ac>] sock_sendmsg+0xcc/0x110 net/socket.c:658
 [<ffffffff8301f8ca>] ___sys_sendmsg+0x47a/0x840 net/socket.c:1982
 [<ffffffff83021e31>] __sys_sendmmsg+0x161/0x3d0 net/socket.c:2072
 [<ffffffff830220d5>] SYSC_sendmmsg net/socket.c:2103 [inline]
 [<ffffffff830220d5>] SyS_sendmmsg+0x35/0x60 net/socket.c:2098
 [<ffffffff81006316>] do_syscall_64+0x1a6/0x490 arch/x86/entry/common.c:282
 [<ffffffff83a019d3>] entry_SYSCALL_64_after_swapgs+0x5d/0xdb
Shutting down cpus with NMI
Dumping ftrace buffer:
   (ftrace buffer empty)
Kernel Offset: disabled
Rebooting in 86400 seconds..