IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_bridge: link becomes ready
IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_bridge: 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 ffff8801d832ef20 by task syz-executor0/4104

CPU: 0 PID: 4104 Comm: syz-executor0 Not tainted 4.4.151-ge917467 #20
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
 0000000000000000 2e168def5ba54701 ffff8800b9e27a30 ffffffff81e15eed
 ffffea000760ca00 ffff8801d832ef20 0000000000000000 ffff8801d832ef20
 0000000000000000 ffff8800b9e27a68 ffffffff8151b390 ffff8801d832ef20
Call Trace:
 [<ffffffff81e15eed>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81e15eed>] dump_stack+0xc1/0x124 lib/dump_stack.c:51
 [<ffffffff8151b390>] print_address_description+0x6c/0x216 mm/kasan/report.c:252
 [<ffffffff8151b6af>] kasan_report_error mm/kasan/report.c:351 [inline]
 [<ffffffff8151b6af>] kasan_report.cold.7+0x175/0x2f7 mm/kasan/report.c:408
 [<ffffffff814fe644>] __asan_report_load8_noabort+0x14/0x20 mm/kasan/report.c:429
 [<ffffffff81235d66>] __lock_acquire+0x3c66/0x5270 kernel/locking/lockdep.c:3092
 [<ffffffff81238b4e>] lock_acquire+0x15e/0x450 kernel/locking/lockdep.c:3592
 [<ffffffff838cb3aa>] __raw_spin_lock_bh include/linux/spinlock_api_smp.h:137 [inline]
 [<ffffffff838cb3aa>] _raw_spin_lock_bh+0x3a/0x50 kernel/locking/spinlock.c:175
 [<ffffffff82f2f553>] spin_lock_bh include/linux/spinlock.h:307 [inline]
 [<ffffffff82f2f553>] lock_sock_nested+0x43/0x120 net/core/sock.c:2451
 [<ffffffff835b1070>] lock_sock include/net/sock.h:1493 [inline]
 [<ffffffff835b1070>] pppol2tp_release+0x50/0x310 net/l2tp/l2tp_ppp.c:493
 [<ffffffff82f22d36>] sock_release+0x96/0x1c0 net/socket.c:587
 [<ffffffff82f22e76>] sock_close+0x16/0x20 net/socket.c:1038
 [<ffffffff81528775>] __fput+0x235/0x6f0 fs/file_table.c:208
 [<ffffffff81528cb5>] ____fput+0x15/0x20 fs/file_table.c:244
 [<ffffffff8118ee4f>] 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
 [<ffffffff838cda83>] sysenter_flags_fixed+0xd/0x1a

Allocated by task 4106:
 [<ffffffff81034676>] save_stack_trace+0x26/0x50 arch/x86/kernel/stacktrace.c:63
 [<ffffffff814fd6f3>] save_stack+0x43/0xd0 mm/kasan/kasan.c:512
 [<ffffffff814fd9d7>] set_track mm/kasan/kasan.c:524 [inline]
 [<ffffffff814fd9d7>] kasan_kmalloc+0xc7/0xe0 mm/kasan/kasan.c:616
 [<ffffffff814fa114>] __kmalloc+0x124/0x310 mm/slub.c:3613
 [<ffffffff82f2e414>] kmalloc include/linux/slab.h:481 [inline]
 [<ffffffff82f2e414>] sk_prot_alloc+0x204/0x300 net/core/sock.c:1354
 [<ffffffff82f33dea>] sk_alloc+0x3a/0x3a0 net/core/sock.c:1419
 [<ffffffff835acf93>] pppol2tp_create+0x33/0x1f0 net/l2tp/l2tp_ppp.c:551
 [<ffffffff828f9d96>] pppox_create+0xf6/0x200 drivers/net/ppp/pppox.c:121
 [<ffffffff82f29260>] __sock_create+0x2f0/0x5f0 net/socket.c:1178
 [<ffffffff82f29790>] sock_create net/socket.c:1218 [inline]
 [<ffffffff82f29790>] SYSC_socket net/socket.c:1248 [inline]
 [<ffffffff82f29790>] SyS_socket+0xf0/0x1b0 net/socket.c:1228
 [<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
 [<ffffffff838cda83>] sysenter_flags_fixed+0xd/0x1a

Freed by task 4104:
 [<ffffffff81034676>] save_stack_trace+0x26/0x50 arch/x86/kernel/stacktrace.c:63
 [<ffffffff814fd6f3>] save_stack+0x43/0xd0 mm/kasan/kasan.c:512
 [<ffffffff814fe022>] set_track mm/kasan/kasan.c:524 [inline]
 [<ffffffff814fe022>] kasan_slab_free+0x72/0xc0 mm/kasan/kasan.c:589
 [<ffffffff814fb584>] slab_free_hook mm/slub.c:1383 [inline]
 [<ffffffff814fb584>] slab_free_freelist_hook mm/slub.c:1405 [inline]
 [<ffffffff814fb584>] slab_free mm/slub.c:2859 [inline]
 [<ffffffff814fb584>] kfree+0xf4/0x310 mm/slub.c:3749
 [<ffffffff82f382a7>] sk_prot_free net/core/sock.c:1391 [inline]
 [<ffffffff82f382a7>] sk_destruct+0x407/0x4c0 net/core/sock.c:1472
 [<ffffffff82f383af>] __sk_free+0x4f/0x220 net/core/sock.c:1480
 [<ffffffff82f385b0>] sk_free+0x30/0x40 net/core/sock.c:1491
 [<ffffffff835b054f>] sock_put include/net/sock.h:1639 [inline]
 [<ffffffff835b054f>] pppol2tp_session_sock_put+0x5f/0x70 net/l2tp/l2tp_ppp.c:286
 [<ffffffff835a8dcc>] l2tp_tunnel_closeall+0x23c/0x350 net/l2tp/l2tp_core.c:1277
 [<ffffffff835a995b>] l2tp_udp_encap_destroy+0x8b/0xf0 net/l2tp/l2tp_core.c:1300
 [<ffffffff8349b991>] udpv6_destroy_sock+0xb1/0xd0 net/ipv6/udp.c:1421
 [<ffffffff82f3862d>] sk_common_release+0x6d/0x300 net/core/sock.c:2680
 [<ffffffff8349a645>] udp_lib_close+0x15/0x20 include/net/udp.h:190
 [<ffffffff83301faf>] inet_release+0xff/0x1d0 net/ipv4/af_inet.c:435
 [<ffffffff83424c40>] inet6_release+0x50/0x70 net/ipv6/af_inet6.c:424
 [<ffffffff82f22d36>] sock_release+0x96/0x1c0 net/socket.c:587
 [<ffffffff82f22e76>] sock_close+0x16/0x20 net/socket.c:1038
 [<ffffffff81528775>] __fput+0x235/0x6f0 fs/file_table.c:208
 [<ffffffff81528cb5>] ____fput+0x15/0x20 fs/file_table.c:244
 [<ffffffff8118ee4f>] 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
 [<ffffffff838cda83>] sysenter_flags_fixed+0xd/0x1a

The buggy address belongs to the object at ffff8801d832ee80
 which belongs to the cache kmalloc-2048 of size 2048
The buggy address is located 160 bytes inside of
 2048-byte region [ffff8801d832ee80, ffff8801d832f680)
The buggy address belongs to the page:
kasan: CONFIG_KASAN_INLINE enabled
kasan: GPF could be caused by NULL-ptr deref or user memory access
general protection fault: 0000 [#1] PREEMPT SMP KASAN
Dumping ftrace buffer:
   (ftrace buffer empty)
Modules linked in:
CPU: 1 PID: 4107 Comm: init Not tainted 4.4.151-ge917467 #20
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff8801d87e6000 task.stack: ffff8800babe0000
RIP: 0010:[<ffffffff81e779c1>]  [<ffffffff81e779c1>] lookup_object lib/debugobjects.c:120 [inline]
RIP: 0010:[<ffffffff81e779c1>]  [<ffffffff81e779c1>] debug_object_deactivate+0x191/0x340 lib/debugobjects.c:465
RSP: 0018:ffff8801db307cf0  EFLAGS: 00010003
RAX: dffffc0000000000 RBX: 4f5f4755425f4d56 RCX: 09ebe8eaa84be9ad
RDX: 0000000000000000 RSI: ffffffff844c77a0 RDI: 4f5f4755425f4d6e
RBP: ffff8801db307da8 R08: ffffffff85341110 R09: 0000000000000001
R10: 0000000000000001 R11: ffff8801d87e6000 R12: 1ffff1003b660fa0
R13: ffffffff85a74068 R14: ffff8801cd99fd28 R15: 0000000000000003
FS:  00007f36321067a0(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f3631819a30 CR3: 00000000bb3f7000 CR4: 00000000001606f0
Stack:
 0000000000000092 ffffffff844c77a0 0000000041b58ab3 ffffffff8420c3f7
 ffffffff81e77830 ffff8801d87e6000 ffffed003b0fcd1b ffff8801d87e68e0
 ffff8801db3196d8 0000000000000002 ffff8801db307d80 ffffffff8122c752
Call Trace:
 <IRQ> 
 [<ffffffff812a0cd2>] debug_hrtimer_deactivate kernel/time/hrtimer.c:415 [inline]
 [<ffffffff812a0cd2>] debug_deactivate kernel/time/hrtimer.c:462 [inline]
 [<ffffffff812a0cd2>] __run_hrtimer kernel/time/hrtimer.c:1230 [inline]
 [<ffffffff812a0cd2>] __hrtimer_run_queues+0x222/0x1000 kernel/time/hrtimer.c:1325
 [<ffffffff812a25d1>] hrtimer_interrupt+0x1b1/0x430 kernel/time/hrtimer.c:1359
 [<ffffffff810af544>] local_apic_timer_interrupt+0x74/0xa0 arch/x86/kernel/apic/apic.c:901
 [<ffffffff838ced9c>] smp_apic_timer_interrupt+0x7c/0xa0 arch/x86/kernel/apic/apic.c:925
 [<ffffffff838cdce0>] apic_timer_interrupt+0xa0/0xb0 arch/x86/entry/entry_64.S:741
 <EOI> 
 [<ffffffff81260e07>] console_device+0x97/0xc0 kernel/printk/printk.c:2438
 [<ffffffff820542ef>] tty_lookup_driver drivers/tty/tty_io.c:2000 [inline]
 [<ffffffff820542ef>] tty_open+0x8bf/0xf00 drivers/tty/tty_io.c:2068
 [<ffffffff8152f01d>] chrdev_open+0x22d/0x4c0 fs/char_dev.c:388
 [<ffffffff8151d49b>] do_dentry_open+0x68b/0xbc0 fs/open.c:749
 [<ffffffff81520aca>] vfs_open+0x12a/0x210 fs/open.c:862
 [<ffffffff81551b6e>] do_last fs/namei.c:3222 [inline]
 [<ffffffff81551b6e>] path_openat+0x4ee/0x3a10 fs/namei.c:3359
 [<ffffffff81557da7>] do_filp_open+0x197/0x270 fs/namei.c:3393
 [<ffffffff815213ec>] do_sys_open+0x31c/0x610 fs/open.c:1038
 [<ffffffff8152170d>] SYSC_open fs/open.c:1056 [inline]
 [<ffffffff8152170d>] SyS_open+0x2d/0x40 fs/open.c:1051
 [<ffffffff838cc125>] entry_SYSCALL_64_fastpath+0x22/0x9e
Code: a9 01 00 00 48 8b 1b 41 bf 01 00 00 00 48 85 db 74 42 48 b8 00 00 00 00 00 fc ff df 48 8d 7b 18 41 83 c7 01 48 89 f9 48 c1 e9 03 <80> 3c 01 00 0f 85 0c 01 00 00 4c 3b 73 18 74 7d 48 89 d9 48 c1 
RIP  [<ffffffff81e779c1>] lookup_object lib/debugobjects.c:120 [inline]
RIP  [<ffffffff81e779c1>] debug_object_deactivate+0x191/0x340 lib/debugobjects.c:465
 RSP <ffff8801db307cf0>
---[ end trace 883192f611d4316d ]---