device lo entered promiscuous mode
BUG: sleeping function called from invalid context at net/core/sock.c:2502
in_atomic(): 1, irqs_disabled(): 0, pid: 11396, name: syz-executor4
1 lock held by syz-executor4/11396:
 #0:  (rcu_callback){......}, at: [<ffffffff81289ace>] __rcu_reclaim kernel/rcu/rcu.h:108 [inline]
 #0:  (rcu_callback){......}, at: [<ffffffff81289ace>] rcu_do_batch kernel/rcu/tree.c:2789 [inline]
 #0:  (rcu_callback){......}, at: [<ffffffff81289ace>] invoke_rcu_callbacks kernel/rcu/tree.c:3053 [inline]
 #0:  (rcu_callback){......}, at: [<ffffffff81289ace>] __rcu_process_callbacks kernel/rcu/tree.c:3020 [inline]
 #0:  (rcu_callback){......}, at: [<ffffffff81289ace>] rcu_process_callbacks+0x98e/0x12b0 kernel/rcu/tree.c:3037
Preemption disabled at:[  165.143649] [<ffffffff81f240d4>] __debug_check_no_obj_freed lib/debugobjects.c:711 [inline]
Preemption disabled at:[  165.143649] [<ffffffff81f240d4>] debug_check_no_obj_freed+0x164/0x930 lib/debugobjects.c:749
CPU: 0 PID: 11396 Comm: syz-executor4 Not tainted 4.9.124-g09eb2ba #31
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
 ffff8801db207cd8 ffffffff81eb95e9 ffffffff81f240d4 0000000000000000
 0000000000000101 ffff88019ca36000 ffff88019ca36000 ffff8801db207d10
 ffffffff81426851 ffff88019ca36000 ffffffff840f88a0 00000000000009c6
Call Trace:
 <IRQ> [  165.195933]  [<ffffffff81eb95e9>] __dump_stack lib/dump_stack.c:15 [inline]
 <IRQ> [  165.195933]  [<ffffffff81eb95e9>] dump_stack+0xc1/0x128 lib/dump_stack.c:51
 [<ffffffff81426851>] ___might_sleep.cold.123+0x1bc/0x1f5 kernel/sched/core.c:7988
 [<ffffffff811bd9a5>] __might_sleep+0x95/0x1a0 kernel/sched/core.c:7945
 [<ffffffff8302b774>] lock_sock_nested+0x34/0x120 net/core/sock.c:2502
 [<ffffffff83428dd9>] lock_sock include/net/sock.h:1404 [inline]
 [<ffffffff83428dd9>] inet_shutdown+0x69/0x360 net/ipv4/af_inet.c:823
 [<ffffffff836cb740>] pppol2tp_session_close+0xa0/0xe0 net/l2tp/l2tp_ppp.c:441
 [<ffffffff836c4f71>] l2tp_tunnel_closeall+0x231/0x350 net/l2tp/l2tp_core.c:1368
 [<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> [  165.326907]  [<ffffffff83a010ff>] ? arch_local_irq_restore arch/x86/include/asm/paravirt.h:768 [inline]
 <EOI> [  165.326907]  [<ffffffff83a010ff>] ? __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:162 [inline]
 <EOI> [  165.326907]  [<ffffffff83a010ff>] ? _raw_spin_unlock_irqrestore+0x5f/0x70 kernel/locking/spinlock.c:191
 [<ffffffff81f2425c>] __debug_check_no_obj_freed lib/debugobjects.c:733 [inline]
 [<ffffffff81f2425c>] debug_check_no_obj_freed+0x2ec/0x930 lib/debugobjects.c:749
 [<ffffffff8144c94d>] free_pages_prepare mm/page_alloc.c:1073 [inline]
 [<ffffffff8144c94d>] __free_pages_ok+0x1dd/0x1610 mm/page_alloc.c:1275
 [<ffffffff8144ddde>] free_compound_page+0x5e/0x70 mm/page_alloc.c:606
 [<ffffffff81556419>] free_transhuge_page+0x99/0xc0 mm/huge_memory.c:2231
 [<ffffffff81466200>] __put_compound_page+0x80/0xc0 mm/swap.c:94
 [<ffffffff81467df4>] release_pages+0x2f4/0x970 mm/swap.c:763
 [<ffffffff8150c3c7>] free_pages_and_swap_cache+0x117/0x160 mm/swap_state.c:273
 [<ffffffff814c26a4>] tlb_flush_mmu_free+0xb4/0x150 mm/memory.c:259
 [<ffffffff814cad04>] zap_pte_range mm/memory.c:1216 [inline]
 [<ffffffff814cad04>] zap_pmd_range mm/memory.c:1258 [inline]
 [<ffffffff814cad04>] zap_pud_range mm/memory.c:1279 [inline]
 [<ffffffff814cad04>] unmap_page_range+0x10a4/0x17a0 mm/memory.c:1300
 [<ffffffff814cb501>] unmap_single_vma+0x101/0x260 mm/memory.c:1345
 [<ffffffff814cbe42>] unmap_vmas+0x102/0x1d0 mm/memory.c:1375
 [<ffffffff814e4be4>] exit_mmap+0x214/0x3f0 mm/mmap.c:3020
 [<ffffffff8112db63>] __mmput kernel/fork.c:884 [inline]
 [<ffffffff8112db63>] mmput+0xf3/0x2d0 kernel/fork.c:906
 [<ffffffff81143096>] exit_mm kernel/exit.c:514 [inline]
 [<ffffffff81143096>] do_exit+0x906/0x27b0 kernel/exit.c:820
 [<ffffffff81149251>] do_group_exit+0x111/0x340 kernel/exit.c:937
 [<ffffffff8116c0cf>] get_signal+0x4cf/0x1450 kernel/signal.c:2321
 [<ffffffff81052637>] do_signal+0x87/0x19f0 arch/x86/kernel/signal.c:807
 [<ffffffff81005581>] exit_to_usermode_loop+0xe1/0x120 arch/x86/entry/common.c:157
 [<ffffffff810064d4>] prepare_exit_to_usermode arch/x86/entry/common.c:191 [inline]
 [<ffffffff810064d4>] syscall_return_slowpath arch/x86/entry/common.c:260 [inline]
 [<ffffffff810064d4>] do_syscall_64+0x364/0x490 arch/x86/entry/common.c:287
 [<ffffffff83a019d3>] entry_SYSCALL_64_after_swapgs+0x5d/0xdb

=================================
binder: 11376:11407 transaction failed 29189/-22, size 24-8 line 3013
[ INFO: inconsistent lock state ]
4.9.124-g09eb2ba #31 Tainted: G        W      
---------------------------------
inconsistent {SOFTIRQ-ON-W} -> {IN-SOFTIRQ-W} usage.
syz-executor4/11396 [HC0[0]:SC1[3]:HE1:SE0] takes:
 (sk_lock-AF_PPPOX){+.?.+.}, at: [<ffffffff83428dd9>] lock_sock include/net/sock.h:1404 [inline]
 (sk_lock-AF_PPPOX){+.?.+.}, at: [<ffffffff83428dd9>] inet_shutdown+0x69/0x360 net/ipv4/af_inet.c:823
  mark_held_locks+0xc7/0x130 kernel/locking/lockdep.c:2660
  __trace_hardirqs_on_caller kernel/locking/lockdep.c:2689 [inline]
  trace_hardirqs_on_caller+0x38b/0x590 kernel/locking/lockdep.c:2736
  trace_hardirqs_on+0xd/0x10 kernel/locking/lockdep.c:2743
  __local_bh_enable_ip+0x6a/0xd0 kernel/softirq.c:190
  local_bh_enable include/linux/bottom_half.h:31 [inline]
  lock_sock_nested+0xdc/0x120 net/core/sock.c:2512
  lock_sock include/net/sock.h:1404 [inline]
  pppol2tp_connect+0xd9/0x18f0 net/l2tp/l2tp_ppp.c:590
  SYSC_connect+0x1b8/0x300 net/socket.c:1575
  SyS_connect+0x24/0x30 net/socket.c:1556
  do_syscall_64+0x1a6/0x490 arch/x86/entry/common.c:282
  entry_SYSCALL_64_after_swapgs+0x5d/0xdb
irq event stamp: 894
hardirqs last  enabled at (894): [<ffffffff83a02369>] restore_regs_and_iret+0x0/0x1d
hardirqs last disabled at (893): [<ffffffff83a022db>] common_interrupt+0x9b/0xa0 arch/x86/entry/entry_64.S:461
softirqs last  enabled at (158): [<ffffffff8357aa8d>] in6_dump_addrs net/ipv6/addrconf.c:4801 [inline]
softirqs last  enabled at (158): [<ffffffff8357aa8d>] inet6_dump_addr+0x59d/0x1510 net/ipv6/addrconf.c:4836
softirqs last disabled at (723): [<ffffffff8114d554>] invoke_softirq kernel/softirq.c:368 [inline]
softirqs last disabled at (723): [<ffffffff8114d554>] irq_exit+0x114/0x150 kernel/softirq.c:409

other info that might help us debug this:
 Possible unsafe locking scenario:

       CPU0
       ----
  lock(sk_lock-AF_PPPOX);
  <Interrupt>
    lock(sk_lock-AF_PPPOX);

 *** DEADLOCK ***

1 lock held by syz-executor4/11396:
 #0:  (rcu_callback){......}, at: [<ffffffff81289ace>] __rcu_reclaim kernel/rcu/rcu.h:108 [inline]
 #0:  (rcu_callback){......}, at: [<ffffffff81289ace>] rcu_do_batch kernel/rcu/tree.c:2789 [inline]
 #0:  (rcu_callback){......}, at: [<ffffffff81289ace>] invoke_rcu_callbacks kernel/rcu/tree.c:3053 [inline]
 #0:  (rcu_callback){......}, at: [<ffffffff81289ace>] __rcu_process_callbacks kernel/rcu/tree.c:3020 [inline]
 #0:  (rcu_callback){......}, at: [<ffffffff81289ace>] rcu_process_callbacks+0x98e/0x12b0 kernel/rcu/tree.c:3037

stack backtrace:
CPU: 0 PID: 11396 Comm: syz-executor4 Tainted: G        W       4.9.124-g09eb2ba #31
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
 ffff8801db207a58 ffffffff81eb95e9 ffff88019ca36000 ffffffff855faad0
 ffff88019ca368f0 ffff88019ca36910 0000000000000000 ffff8801db207ac8
 ffffffff81429ccd 0000000000000003 0000000000000001 ffff880100000000
Call Trace:
 <IRQ> [  165.812641]  [<ffffffff81eb95e9>] __dump_stack lib/dump_stack.c:15 [inline]
 <IRQ> [  165.812641]  [<ffffffff81eb95e9>] dump_stack+0xc1/0x128 lib/dump_stack.c:51
 [<ffffffff81429ccd>] print_usage_bug.cold.57+0x327/0x421 kernel/locking/lockdep.c:2387
 [<ffffffff81237726>] valid_state kernel/locking/lockdep.c:2400 [inline]
 [<ffffffff81237726>] mark_lock_irq kernel/locking/lockdep.c:2602 [inline]
 [<ffffffff81237726>] mark_lock+0xcc6/0x1280 kernel/locking/lockdep.c:3065
 [<ffffffff812390f0>] mark_irqflags kernel/locking/lockdep.c:2923 [inline]
 [<ffffffff812390f0>] __lock_acquire+0xd40/0x4070 kernel/locking/lockdep.c:3302
 [<ffffffff8123ce90>] lock_acquire+0x130/0x3e0 kernel/locking/lockdep.c:3756
 [<ffffffff8302b806>] lock_sock_nested+0xc6/0x120 net/core/sock.c:2511
 [<ffffffff83428dd9>] lock_sock include/net/sock.h:1404 [inline]
 [<ffffffff83428dd9>] inet_shutdown+0x69/0x360 net/ipv4/af_inet.c:823
 [<ffffffff836cb740>] pppol2tp_session_close+0xa0/0xe0 net/l2tp/l2tp_ppp.c:441
 [<ffffffff836c4f71>] l2tp_tunnel_closeall+0x231/0x350 net/l2tp/l2tp_core.c:1368
 [<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> [  165.984140]  [<ffffffff83a010ff>] ? arch_local_irq_restore arch/x86/include/asm/paravirt.h:768 [inline]
 <EOI> [  165.984140]  [<ffffffff83a010ff>] ? __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:162 [inline]
 <EOI> [  165.984140]  [<ffffffff83a010ff>] ? _raw_spin_unlock_irqrestore+0x5f/0x70 kernel/locking/spinlock.c:191
 [<ffffffff81f2425c>] __debug_check_no_obj_freed lib/debugobjects.c:733 [inline]
 [<ffffffff81f2425c>] debug_check_no_obj_freed+0x2ec/0x930 lib/debugobjects.c:749
 [<ffffffff8144c94d>] free_pages_prepare mm/page_alloc.c:1073 [inline]
 [<ffffffff8144c94d>] __free_pages_ok+0x1dd/0x1610 mm/page_alloc.c:1275
 [<ffffffff8144ddde>] free_compound_page+0x5e/0x70 mm/page_alloc.c:606
 [<ffffffff81556419>] free_transhuge_page+0x99/0xc0 mm/huge_memory.c:2231
 [<ffffffff81466200>] __put_compound_page+0x80/0xc0 mm/swap.c:94
 [<ffffffff81467df4>] release_pages+0x2f4/0x970 mm/swap.c:763
 [<ffffffff8150c3c7>] free_pages_and_swap_cache+0x117/0x160 mm/swap_state.c:273
 [<ffffffff814c26a4>] tlb_flush_mmu_free+0xb4/0x150 mm/memory.c:259
 [<ffffffff814cad04>] zap_pte_range mm/memory.c:1216 [inline]
 [<ffffffff814cad04>] zap_pmd_range mm/memory.c:1258 [inline]
 [<ffffffff814cad04>] zap_pud_range mm/memory.c:1279 [inline]
 [<ffffffff814cad04>] unmap_page_range+0x10a4/0x17a0 mm/memory.c:1300
 [<ffffffff814cb501>] unmap_single_vma+0x101/0x260 mm/memory.c:1345
 [<ffffffff814cbe42>] unmap_vmas+0x102/0x1d0 mm/memory.c:1375
 [<ffffffff814e4be4>] exit_mmap+0x214/0x3f0 mm/mmap.c:3020
 [<ffffffff8112db63>] __mmput kernel/fork.c:884 [inline]
 [<ffffffff8112db63>] mmput+0xf3/0x2d0 kernel/fork.c:906
 [<ffffffff81143096>] exit_mm kernel/exit.c:514 [inline]
 [<ffffffff81143096>] do_exit+0x906/0x27b0 kernel/exit.c:820
 [<ffffffff81149251>] do_group_exit+0x111/0x340 kernel/exit.c:937
 [<ffffffff8116c0cf>] get_signal+0x4cf/0x1450 kernel/signal.c:2321
 [<ffffffff81052637>] do_signal+0x87/0x19f0 arch/x86/kernel/signal.c:807
 [<ffffffff81005581>] exit_to_usermode_loop+0xe1/0x120 arch/x86/entry/common.c:157
 [<ffffffff810064d4>] prepare_exit_to_usermode arch/x86/entry/common.c:191 [inline]
 [<ffffffff810064d4>] syscall_return_slowpath arch/x86/entry/common.c:260 [inline]
 [<ffffffff810064d4>] do_syscall_64+0x364/0x490 arch/x86/entry/common.c:287
 [<ffffffff83a019d3>] entry_SYSCALL_64_after_swapgs+0x5d/0xdb
==================================================================
BUG: KASAN: use-after-free in inet_shutdown+0x2dc/0x360 net/ipv4/af_inet.c:824
Read of size 4 at addr ffff8801b6e88cc0 by task syz-executor4/11396

CPU: 0 PID: 11396 Comm: syz-executor4 Tainted: G        W       4.9.124-g09eb2ba #31
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
 ffff8801db207cf8 ffffffff81eb95e9 ffffea0006dba200 ffff8801b6e88cc0
 0000000000000000 ffff8801b6e88cc0 ffff8801d4fbf458 ffff8801db207d30
 ffffffff8156c35e ffff8801b6e88cc0 0000000000000004 0000000000000000
Call Trace:
 <IRQ> [  166.306281]  [<ffffffff81eb95e9>] __dump_stack lib/dump_stack.c:15 [inline]
 <IRQ> [  166.306281]  [<ffffffff81eb95e9>] dump_stack+0xc1/0x128 lib/dump_stack.c:51
 [<ffffffff8156c35e>] print_address_description+0x6c/0x234 mm/kasan/report.c:256
 [<ffffffff8156c768>] kasan_report_error mm/kasan/report.c:355 [inline]
 [<ffffffff8156c768>] kasan_report.cold.6+0x242/0x2fe mm/kasan/report.c:412
 [<ffffffff8153fad4>] __asan_report_load4_noabort+0x14/0x20 mm/kasan/report.c:432
 [<ffffffff8342904c>] inet_shutdown+0x2dc/0x360 net/ipv4/af_inet.c:824
 [<ffffffff836cb740>] pppol2tp_session_close+0xa0/0xe0 net/l2tp/l2tp_ppp.c:441
 [<ffffffff836c4f71>] l2tp_tunnel_closeall+0x231/0x350 net/l2tp/l2tp_core.c:1368
 [<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> [  166.430996]  [<ffffffff83a010ff>] ? arch_local_irq_restore arch/x86/include/asm/paravirt.h:768 [inline]
 <EOI> [  166.430996]  [<ffffffff83a010ff>] ? __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:162 [inline]
 <EOI> [  166.430996]  [<ffffffff83a010ff>] ? _raw_spin_unlock_irqrestore+0x5f/0x70 kernel/locking/spinlock.c:191
 [<ffffffff81f2425c>] __debug_check_no_obj_freed lib/debugobjects.c:733 [inline]
 [<ffffffff81f2425c>] debug_check_no_obj_freed+0x2ec/0x930 lib/debugobjects.c:749
 [<ffffffff8144c94d>] free_pages_prepare mm/page_alloc.c:1073 [inline]
 [<ffffffff8144c94d>] __free_pages_ok+0x1dd/0x1610 mm/page_alloc.c:1275
 [<ffffffff8144ddde>] free_compound_page+0x5e/0x70 mm/page_alloc.c:606
 [<ffffffff81556419>] free_transhuge_page+0x99/0xc0 mm/huge_memory.c:2231
 [<ffffffff81466200>] __put_compound_page+0x80/0xc0 mm/swap.c:94
 [<ffffffff81467df4>] release_pages+0x2f4/0x970 mm/swap.c:763
 [<ffffffff8150c3c7>] free_pages_and_swap_cache+0x117/0x160 mm/swap_state.c:273
 [<ffffffff814c26a4>] tlb_flush_mmu_free+0xb4/0x150 mm/memory.c:259
 [<ffffffff814cad04>] zap_pte_range mm/memory.c:1216 [inline]
 [<ffffffff814cad04>] zap_pmd_range mm/memory.c:1258 [inline]
 [<ffffffff814cad04>] zap_pud_range mm/memory.c:1279 [inline]
 [<ffffffff814cad04>] unmap_page_range+0x10a4/0x17a0 mm/memory.c:1300
 [<ffffffff814cb501>] unmap_single_vma+0x101/0x260 mm/memory.c:1345
 [<ffffffff814cbe42>] unmap_vmas+0x102/0x1d0 mm/memory.c:1375
 [<ffffffff814e4be4>] exit_mmap+0x214/0x3f0 mm/mmap.c:3020
 [<ffffffff8112db63>] __mmput kernel/fork.c:884 [inline]
 [<ffffffff8112db63>] mmput+0xf3/0x2d0 kernel/fork.c:906
 [<ffffffff81143096>] exit_mm kernel/exit.c:514 [inline]
 [<ffffffff81143096>] do_exit+0x906/0x27b0 kernel/exit.c:820
 [<ffffffff81149251>] do_group_exit+0x111/0x340 kernel/exit.c:937
 [<ffffffff8116c0cf>] get_signal+0x4cf/0x1450 kernel/signal.c:2321
 [<ffffffff81052637>] do_signal+0x87/0x19f0 arch/x86/kernel/signal.c:807
 [<ffffffff81005581>] exit_to_usermode_loop+0xe1/0x120 arch/x86/entry/common.c:157
 [<ffffffff810064d4>] prepare_exit_to_usermode arch/x86/entry/common.c:191 [inline]
 [<ffffffff810064d4>] syscall_return_slowpath arch/x86/entry/common.c:260 [inline]
 [<ffffffff810064d4>] do_syscall_64+0x364/0x490 arch/x86/entry/common.c:287
 [<ffffffff83a019d3>] entry_SYSCALL_64_after_swapgs+0x5d/0xdb

Allocated by task 11392:
 save_stack_trace+0x16/0x20 arch/x86/kernel/stacktrace.c:57
 save_stack+0x43/0xd0 mm/kasan/kasan.c:505
 set_track mm/kasan/kasan.c:517 [inline]
 kasan_kmalloc+0xc7/0xe0 mm/kasan/kasan.c:609
 kasan_slab_alloc+0x12/0x20 mm/kasan/kasan.c:547
 slab_post_alloc_hook mm/slab.h:417 [inline]
 slab_alloc_node mm/slub.c:2715 [inline]
 slab_alloc mm/slub.c:2723 [inline]
 kmem_cache_alloc+0xbe/0x290 mm/slub.c:2728
 sock_alloc_inode+0x1d/0x260 net/socket.c:251
 alloc_inode+0x63/0x180 fs/inode.c:207
 new_inode_pseudo+0x17/0xe0 fs/inode.c:890
 sock_alloc+0x41/0x280 net/socket.c:571
 __sock_create+0x8d/0x5f0 net/socket.c:1159
 sock_create net/socket.c:1235 [inline]
 SYSC_socket net/socket.c:1265 [inline]
 SyS_socket+0xf0/0x1b0 net/socket.c:1245
 do_syscall_64+0x1a6/0x490 arch/x86/entry/common.c:282
 entry_SYSCALL_64_after_swapgs+0x5d/0xdb

Freed by task 11384:
 save_stack_trace+0x16/0x20 arch/x86/kernel/stacktrace.c:57
 save_stack+0x43/0xd0 mm/kasan/kasan.c:505
 set_track mm/kasan/kasan.c:517 [inline]
 kasan_slab_free+0x72/0xc0 mm/kasan/kasan.c:582
 slab_free_hook mm/slub.c:1355 [inline]
 slab_free_freelist_hook mm/slub.c:1377 [inline]
 slab_free mm/slub.c:2958 [inline]
 kmem_cache_free+0xbe/0x310 mm/slub.c:2980
 sock_destroy_inode+0x56/0x70 net/socket.c:281
 destroy_inode+0xc5/0x120 fs/inode.c:264
 evict+0x32b/0x4f0 fs/inode.c:570
 iput_final fs/inode.c:1516 [inline]
 iput+0x371/0x900 fs/inode.c:1543
 dentry_unlink_inode+0x277/0x330 fs/dcache.c:367
 __dentry_kill+0x280/0x4c0 fs/dcache.c:569
 dentry_kill fs/dcache.c:610 [inline]
 dput.part.29+0x5cf/0x7b0 fs/dcache.c:827
 dput+0x1f/0x30 fs/dcache.c:789
 __fput+0x42f/0x700 fs/file_table.c:226
 ____fput+0x15/0x20 fs/file_table.c:244
 task_work_run+0x10c/0x180 kernel/task_work.c:116
 tracehook_notify_resume include/linux/tracehook.h:191 [inline]
 exit_to_usermode_loop+0xfc/0x120 arch/x86/entry/common.c:161
 prepare_exit_to_usermode arch/x86/entry/common.c:191 [inline]
 syscall_return_slowpath arch/x86/entry/common.c:260 [inline]
 do_syscall_64+0x364/0x490 arch/x86/entry/common.c:287
 entry_SYSCALL_64_after_swapgs+0x5d/0xdb

The buggy address belongs to the object at ffff8801b6e88cc0
 which belongs to the cache sock_inode_cache of size 960
The buggy address is located 0 bytes inside of
 960-byte region [ffff8801b6e88cc0, ffff8801b6e89080)
The buggy address belongs to the page:
page:ffffea0006dba200 count:1 mapcount:0 mapping:          (null) index:0x0 compound_mapcount: 0
flags: 0x8000000000004080(slab|head)
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8801b6e88b80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff8801b6e88c00: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
>ffff8801b6e88c80: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb
                                           ^
 ffff8801b6e88d00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff8801b6e88d80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================