binder: BINDER_SET_CONTEXT_MGR already set
binder: 7976:7977 ioctl 40046207 0 returned -16
binder: 7976:7980 transaction failed 29189/-22, size 24-8 line 3013

===============================
[ INFO: suspicious RCU usage. ]
4.9.117-g8b21e85 #19 Not tainted
-------------------------------
kernel/rcu/tree_plugin.h:678 Illegal synchronize_rcu() in RCU read-side critical section!

other info that might help us debug this:


rcu_scheduler_active = 2, debug_locks = 0
4 locks held by blkid/7984:
 #0:  (&mm->mmap_sem){++++++}, at: [<ffffffff810db7db>] __do_page_fault+0x36b/0xd50 arch/x86/mm/fault.c:1336
 #1:  (rcu_read_lock){......}, at: [<ffffffff814378ea>] filemap_map_pages+0xfa/0xd40 mm/filemap.c:2242
 #2:  (&(ptlock_ptr(page))->rlock#2){+.+...}, at: [<ffffffff814cc028>] spin_lock include/linux/spinlock.h:302 [inline]
 #2:  (&(ptlock_ptr(page))->rlock#2){+.+...}, at: [<ffffffff814cc028>] pte_alloc_one_map mm/memory.c:2906 [inline]
 #2:  (&(ptlock_ptr(page))->rlock#2){+.+...}, at: [<ffffffff814cc028>] alloc_set_pte+0xb98/0x11d0 mm/memory.c:3004
 #3:  (rcu_callback){......}, at: [<ffffffff812878ee>] __rcu_reclaim kernel/rcu/rcu.h:108 [inline]
 #3:  (rcu_callback){......}, at: [<ffffffff812878ee>] rcu_do_batch kernel/rcu/tree.c:2789 [inline]
 #3:  (rcu_callback){......}, at: [<ffffffff812878ee>] invoke_rcu_callbacks kernel/rcu/tree.c:3053 [inline]
 #3:  (rcu_callback){......}, at: [<ffffffff812878ee>] __rcu_process_callbacks kernel/rcu/tree.c:3020 [inline]
 #3:  (rcu_callback){......}, at: [<ffffffff812878ee>] rcu_process_callbacks+0x98e/0x12b0 kernel/rcu/tree.c:3037

stack backtrace:
CPU: 1 PID: 7984 Comm: blkid Not tainted 4.9.117-g8b21e85 #19
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
 ffff8801db307d60 ffffffff81eb4be9 ffff88019b5e9800 0000000000000000
 0000000000000002 ffffffff83c6df20 ffff8801bed72b58 ffff8801db307d90
 ffffffff81426320 ffff8801bed72a00 ffff88019fd54c48 ffff88019fd54448
Call Trace:
 <IRQ> 
 [<ffffffff81eb4be9>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81eb4be9>] dump_stack+0xc1/0x128 lib/dump_stack.c:51
 [<ffffffff81426320>] lockdep_rcu_suspicious.cold.48+0x110/0x141 kernel/locking/lockdep.c:4455
 [<ffffffff81284188>] synchronize_rcu+0x68/0x90 kernel/rcu/tree_plugin.h:675
 [<ffffffff836bfd8a>] __l2tp_session_unhash+0x38a/0x520 net/l2tp/l2tp_core.c:1796
 [<ffffffff836c0117>] l2tp_tunnel_closeall+0x1f7/0x350 net/l2tp/l2tp_core.c:1364
 [<ffffffff836c09d2>] l2tp_tunnel_destruct+0x2f2/0x590 net/l2tp/l2tp_core.c:1324
 [<ffffffff83023095>] __sk_destruct+0x55/0x590 net/core/sock.c:1428
 [<ffffffff8128780e>] __rcu_reclaim kernel/rcu/rcu.h:118 [inline]
 [<ffffffff8128780e>] rcu_do_batch kernel/rcu/tree.c:2789 [inline]
 [<ffffffff8128780e>] invoke_rcu_callbacks kernel/rcu/tree.c:3053 [inline]
 [<ffffffff8128780e>] __rcu_process_callbacks kernel/rcu/tree.c:3020 [inline]
 [<ffffffff8128780e>] rcu_process_callbacks+0x8ae/0x12b0 kernel/rcu/tree.c:3037
 [<ffffffff83a037fb>] __do_softirq+0x20b/0x937 kernel/softirq.c:284
 [<ffffffff8114b277>] invoke_softirq kernel/softirq.c:364 [inline]
 [<ffffffff8114b277>] irq_exit+0x147/0x190 kernel/softirq.c:405
 [<ffffffff83a023e1>] exiting_irq arch/x86/include/asm/apic.h:659 [inline]
 [<ffffffff83a023e1>] smp_apic_timer_interrupt+0x81/0xa0 arch/x86/kernel/apic/apic.c:960
 [<ffffffff839fe570>] apic_timer_interrupt+0xa0/0xb0 arch/x86/entry/entry_64.S:648
 <EOI> 
 [<ffffffff814d1653>] do_fault_around mm/memory.c:3129 [inline]
 [<ffffffff814d1653>] do_read_fault mm/memory.c:3169 [inline]
 [<ffffffff814d1653>] do_fault mm/memory.c:3309 [inline]
 [<ffffffff814d1653>] handle_pte_fault mm/memory.c:3510 [inline]
 [<ffffffff814d1653>] __handle_mm_fault mm/memory.c:3597 [inline]
 [<ffffffff814d1653>] handle_mm_fault+0x1cb3/0x28e0 mm/memory.c:3634
 [<ffffffff810dba1f>] __do_page_fault+0x5af/0xd50 arch/x86/mm/fault.c:1407
 [<ffffffff810dc1e7>] do_page_fault+0x27/0x30 arch/x86/mm/fault.c:1470
 [<ffffffff839fdd88>] page_fault+0x28/0x30 arch/x86/entry/entry_64.S:951
ODEBUG: object ffff8801db307ce8 is NOT on stack ffff8801cdda8000, but annotated
------------[ cut here ]------------
WARNING: CPU: 1 PID: 7984 at lib/debugobjects.c:303 debug_object_is_on_stack lib/debugobjects.c:303 [inline]
WARNING: CPU: 1 PID: 7984 at lib/debugobjects.c:303 __debug_object_init.cold.10+0x6b/0x2b0 lib/debugobjects.c:329