IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready
IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready
IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready
IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready
==================================================================
BUG: KASAN: use-after-free in __lock_acquire+0x3c66/0x5270 kernel/locking/lockdep.c:3092
Read of size 8 at addr ffff8800bbb0bc20 by task syz-executor7/8766

CPU: 0 PID: 8766 Comm: syz-executor7 Not tainted 4.4.145-g2241aa9 #14
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
 0000000000000000 edc42782cdb88ebf ffff8800ba6afa30 ffffffff81e123cd
 ffffea0002eec200 ffff8800bbb0bc20 0000000000000000 ffff8800bbb0bc20
 0000000000000000 ffff8800ba6afa68 ffffffff81517d66 ffff8800bbb0bc20
Call Trace:
 [<ffffffff81e123cd>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81e123cd>] dump_stack+0xc1/0x124 lib/dump_stack.c:51
 [<ffffffff81517d66>] print_address_description+0x6c/0x216 mm/kasan/report.c:252
 [<ffffffff81518085>] kasan_report_error mm/kasan/report.c:351 [inline]
 [<ffffffff81518085>] kasan_report.cold.7+0x175/0x2f7 mm/kasan/report.c:408
 [<ffffffff814fbb74>] __asan_report_load8_noabort+0x14/0x20 mm/kasan/report.c:429
 [<ffffffff81234f26>] __lock_acquire+0x3c66/0x5270 kernel/locking/lockdep.c:3092
 [<ffffffff81237d0e>] lock_acquire+0x15e/0x450 kernel/locking/lockdep.c:3592
 [<ffffffff838c775a>] __raw_spin_lock_bh include/linux/spinlock_api_smp.h:137 [inline]
 [<ffffffff838c775a>] _raw_spin_lock_bh+0x3a/0x50 kernel/locking/spinlock.c:175
 [<ffffffff82f2b583>] spin_lock_bh include/linux/spinlock.h:307 [inline]
 [<ffffffff82f2b583>] lock_sock_nested+0x43/0x120 net/core/sock.c:2451
 [<ffffffff835ad430>] lock_sock include/net/sock.h:1493 [inline]
 [<ffffffff835ad430>] pppol2tp_release+0x50/0x310 net/l2tp/l2tp_ppp.c:493
 [<ffffffff82f1ed76>] sock_release+0x96/0x1c0 net/socket.c:586
 [<ffffffff82f1eeb6>] sock_close+0x16/0x20 net/socket.c:1037
 [<ffffffff81525155>] __fput+0x235/0x6f0 fs/file_table.c:208
 [<ffffffff81525695>] ____fput+0x15/0x20 fs/file_table.c:244
 [<ffffffff8118e00f>] task_work_run+0x10f/0x190 kernel/task_work.c:115
 [<ffffffff8100362d>] tracehook_notify_resume include/linux/tracehook.h:191 [inline]
 [<ffffffff8100362d>] exit_to_usermode_loop+0x13d/0x160 arch/x86/entry/common.c:253
 [<ffffffff8100708e>] prepare_exit_to_usermode arch/x86/entry/common.c:284 [inline]
 [<ffffffff8100708e>] syscall_return_slowpath arch/x86/entry/common.c:349 [inline]
 [<ffffffff8100708e>] do_syscall_32_irqs_on arch/x86/entry/common.c:399 [inline]
 [<ffffffff8100708e>] do_fast_syscall_32+0x61e/0x8b0 arch/x86/entry/common.c:460
 [<ffffffff838c9e43>] sysenter_flags_fixed+0xd/0x1a

Allocated by task 8767:
 [<ffffffff81034676>] save_stack_trace+0x26/0x50 arch/x86/kernel/stacktrace.c:63
 [<ffffffff814fac23>] save_stack+0x43/0xd0 mm/kasan/kasan.c:512
 [<ffffffff814faf07>] set_track mm/kasan/kasan.c:524 [inline]
 [<ffffffff814faf07>] kasan_kmalloc+0xc7/0xe0 mm/kasan/kasan.c:616
 [<ffffffff814f7624>] __kmalloc+0x124/0x310 mm/slub.c:3613
 [<ffffffff82f2a444>] kmalloc include/linux/slab.h:481 [inline]
 [<ffffffff82f2a444>] sk_prot_alloc+0x204/0x300 net/core/sock.c:1354
 [<ffffffff82f2fe1a>] sk_alloc+0x3a/0x3a0 net/core/sock.c:1419
 [<ffffffff835a9353>] pppol2tp_create+0x33/0x1f0 net/l2tp/l2tp_ppp.c:551
 [<ffffffff828f5f76>] pppox_create+0xf6/0x200 drivers/net/ppp/pppox.c:121
 [<ffffffff82f252a0>] __sock_create+0x2f0/0x5f0 net/socket.c:1177
 [<ffffffff82f257d0>] sock_create net/socket.c:1217 [inline]
 [<ffffffff82f257d0>] SYSC_socket net/socket.c:1247 [inline]
 [<ffffffff82f257d0>] SyS_socket+0xf0/0x1b0 net/socket.c:1227
 [<ffffffff81006d94>] do_syscall_32_irqs_on arch/x86/entry/common.c:393 [inline]
 [<ffffffff81006d94>] do_fast_syscall_32+0x324/0x8b0 arch/x86/entry/common.c:460
 [<ffffffff838c9e43>] sysenter_flags_fixed+0xd/0x1a

Freed by task 8766:
 [<ffffffff81034676>] save_stack_trace+0x26/0x50 arch/x86/kernel/stacktrace.c:63
 [<ffffffff814fac23>] save_stack+0x43/0xd0 mm/kasan/kasan.c:512
 [<ffffffff814fb552>] set_track mm/kasan/kasan.c:524 [inline]
 [<ffffffff814fb552>] kasan_slab_free+0x72/0xc0 mm/kasan/kasan.c:589
 [<ffffffff814f8a54>] slab_free_hook mm/slub.c:1383 [inline]
 [<ffffffff814f8a54>] slab_free_freelist_hook mm/slub.c:1405 [inline]
 [<ffffffff814f8a54>] slab_free mm/slub.c:2859 [inline]
 [<ffffffff814f8a54>] kfree+0xf4/0x310 mm/slub.c:3749
 [<ffffffff82f342d7>] sk_prot_free net/core/sock.c:1391 [inline]
 [<ffffffff82f342d7>] sk_destruct+0x407/0x4c0 net/core/sock.c:1472
 [<ffffffff82f343df>] __sk_free+0x4f/0x220 net/core/sock.c:1480
 [<ffffffff82f345e0>] sk_free+0x30/0x40 net/core/sock.c:1491
 [<ffffffff835ac90f>] sock_put include/net/sock.h:1639 [inline]
 [<ffffffff835ac90f>] pppol2tp_session_sock_put+0x5f/0x70 net/l2tp/l2tp_ppp.c:286
 [<ffffffff835a518c>] l2tp_tunnel_closeall+0x23c/0x350 net/l2tp/l2tp_core.c:1277
 [<ffffffff835a5d1b>] l2tp_udp_encap_destroy+0x8b/0xf0 net/l2tp/l2tp_core.c:1300
 [<ffffffff83497d21>] udpv6_destroy_sock+0xb1/0xd0 net/ipv6/udp.c:1421
 [<ffffffff82f3465d>] sk_common_release+0x6d/0x300 net/core/sock.c:2680
 [<ffffffff834969d5>] udp_lib_close+0x15/0x20 include/net/udp.h:190
 [<ffffffff832fe2cf>] inet_release+0xff/0x1d0 net/ipv4/af_inet.c:435
 [<ffffffff83420fd0>] inet6_release+0x50/0x70 net/ipv6/af_inet6.c:424
 [<ffffffff82f1ed76>] sock_release+0x96/0x1c0 net/socket.c:586
 [<ffffffff82f1eeb6>] sock_close+0x16/0x20 net/socket.c:1037
 [<ffffffff81525155>] __fput+0x235/0x6f0 fs/file_table.c:208
 [<ffffffff81525695>] ____fput+0x15/0x20 fs/file_table.c:244
 [<ffffffff8118e00f>] task_work_run+0x10f/0x190 kernel/task_work.c:115
 [<ffffffff8100362d>] tracehook_notify_resume include/linux/tracehook.h:191 [inline]
 [<ffffffff8100362d>] exit_to_usermode_loop+0x13d/0x160 arch/x86/entry/common.c:253
 [<ffffffff8100708e>] prepare_exit_to_usermode arch/x86/entry/common.c:284 [inline]
 [<ffffffff8100708e>] syscall_return_slowpath arch/x86/entry/common.c:349 [inline]
 [<ffffffff8100708e>] do_syscall_32_irqs_on arch/x86/entry/common.c:399 [inline]
 [<ffffffff8100708e>] do_fast_syscall_32+0x61e/0x8b0 arch/x86/entry/common.c:460
 [<ffffffff838c9e43>] sysenter_flags_fixed+0xd/0x1a

The buggy address belongs to the object at ffff8800bbb0bb80
 which belongs to the cache kmalloc-2048 of size 2048
The buggy address is located 160 bytes inside of
 2048-byte region [ffff8800bbb0bb80, ffff8800bbb0c380)
The buggy address belongs to the page:
kasan: CONFIG_KASAN_INLINE enabled
kasan: GPF could be caused by NULL-ptr deref or user memory accessgeneral protection fault: 0000 [#1] PREEMPT SMP KASAN
Dumping ftrace buffer:
   (ftrace buffer empty)
Modules linked in:
CPU: 1 PID: 0 Comm: swapper/1 Not tainted 4.4.145-g2241aa9 #14
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff8801d9a41800 task.stack: ffff8801d9a50000
RIP: 0010:[<ffffffff81e23481>]  [<ffffffff81e23481>] rb_set_parent_color include/linux/rbtree_augmented.h:117 [inline]
RIP: 0010:[<ffffffff81e23481>]  [<ffffffff81e23481>] ____rb_erase_color lib/rbtree.c:345 [inline]
RIP: 0010:[<ffffffff81e23481>]  [<ffffffff81e23481>] rb_erase+0x721/0x1cb0 lib/rbtree.c:429
RSP: 0018:ffff8801db307cf8  EFLAGS: 00010082
RAX: 5028454741505f4e RBX: dffffc0000000000 RCX: ffff8800ba45fd38
RDX: ffffed003b6632f2 RSI: ffff8801db319790 RDI: 0a0508a8e82a0be9
RBP: ffff8801db307d40 R08: ffffffff85341110 R09: 0000000000000001
R10: 0000000000000000 R11: ffff8801d9a41800 R12: ffff8800ba45fd28
R13: ffff8800ba45fd29 R14: ffffffff83aaad68 R15: ffffffff83aaad60
FS:  0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000f76f2db0 CR3: 00000001d20f6000 CR4: 00000000001606f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Stack:
 ffffffff844c77a0 ffff8801d9a41800 ffffed003b34841b ffff8801d9a420e0
 ffff8801d9227d28 ffff8801db319790 ffff8801db319798 0000000000000000
 0000000000000000 ffff8801db307d70 ffffffff81e2ffe8 ffffffff844bec20
Call Trace:
 <IRQ> 
 [<ffffffff81e2ffe8>] timerqueue_del+0x78/0x170 lib/timerqueue.c:86
 [<ffffffff8129df0e>] __remove_hrtimer+0x8e/0x250 kernel/time/hrtimer.c:917
 [<ffffffff8129ff3d>] __run_hrtimer kernel/time/hrtimer.c:1242 [inline]
 [<ffffffff8129ff3d>] __hrtimer_run_queues+0x2dd/0x1000 kernel/time/hrtimer.c:1325
 [<ffffffff812a1781>] hrtimer_interrupt+0x1b1/0x430 kernel/time/hrtimer.c:1359
 [<ffffffff810af3a4>] local_apic_timer_interrupt+0x74/0xa0 arch/x86/kernel/apic/apic.c:901
 [<ffffffff838cb15c>] smp_apic_timer_interrupt+0x7c/0xa0 arch/x86/kernel/apic/apic.c:925
 [<ffffffff838ca0a0>] apic_timer_interrupt+0xa0/0xb0 arch/x86/entry/entry_64.S:741
 <EOI> 
 [<ffffffff81025cd5>] arch_safe_halt arch/x86/include/asm/paravirt.h:117 [inline]
 [<ffffffff81025cd5>] default_idle+0x55/0x3c0 arch/x86/kernel/process.c:432
 [<ffffffff81027be0>] arch_cpu_idle+0x10/0x20 arch/x86/kernel/process.c:423
 [<ffffffff8121de97>] default_idle_call+0x57/0x70 kernel/sched/idle.c:93
 [<ffffffff8121e63f>] cpuidle_idle_call kernel/sched/idle.c:157 [inline]
 [<ffffffff8121e63f>] cpu_idle_loop kernel/sched/idle.c:253 [inline]
 [<ffffffff8121e63f>] cpu_startup_entry+0x6af/0x780 kernel/sched/idle.c:301
 [<ffffffff810abf79>] start_secondary+0x329/0x400 arch/x86/kernel/smpboot.c:245
Code: 15 00 00 4c 89 f7 49 89 44 24 10 48 c1 ef 03 80 3c 1f 00 0f 85 fd 14 00 00 48 89 c7 4d 89 e5 4d 89 67 08 48 c1 ef 03 49 83 cd 01 <80> 3c 1f 00 0f 85 95 0f 00 00 4c 89 e7 4c 89 28 48 c1 ef 03 80 
RIP  [<ffffffff81e23481>] rb_set_parent_color include/linux/rbtree_augmented.h:117 [inline]
RIP  [<ffffffff81e23481>] ____rb_erase_color lib/rbtree.c:345 [inline]
RIP  [<ffffffff81e23481>] rb_erase+0x721/0x1cb0 lib/rbtree.c:429
 RSP <ffff8801db307cf8>
---[ end trace 7820d32e37d11018 ]---