IPv6: ADDRCONF(NETDEV_CHANGE): hsr0: link becomes ready
IPv6: ADDRCONF(NETDEV_UP): vxcan1: link is not ready
8021q: adding VLAN 0 to HW filter on device batadv0
IPv6: ADDRCONF(NETDEV_CHANGE): bond0: link becomes ready
==================================================================
BUG: KASAN: use-after-free in __lock_acquire+0x303c/0x45e0 kernel/locking/lockdep.c:3365
Read of size 8 at addr ffff8880a9bca6e0 by task syz-executor.0/7387

CPU: 0 PID: 7387 Comm: syz-executor.0 Not tainted 4.14.113 #3
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:17 [inline]
 dump_stack+0x138/0x19c lib/dump_stack.c:53
 print_address_description.cold+0x7c/0x1dc mm/kasan/report.c:252
 kasan_report_error mm/kasan/report.c:351 [inline]
 kasan_report mm/kasan/report.c:409 [inline]
 kasan_report.cold+0xaf/0x2b5 mm/kasan/report.c:393
 __asan_report_load8_noabort+0x14/0x20 mm/kasan/report.c:430
 __lock_acquire+0x303c/0x45e0 kernel/locking/lockdep.c:3365
 lock_acquire+0x16f/0x430 kernel/locking/lockdep.c:3994
 __raw_spin_lock_bh include/linux/spinlock_api_smp.h:135 [inline]
 _raw_spin_lock_bh+0x33/0x50 kernel/locking/spinlock.c:176
 spin_lock_bh include/linux/spinlock.h:322 [inline]
 lock_sock_nested+0x3f/0x110 net/core/sock.c:2760
 lock_sock include/net/sock.h:1462 [inline]
 pppol2tp_release+0x4e/0x300 net/l2tp/l2tp_ppp.c:476
 __sock_release+0xd3/0x2c0 net/socket.c:602
 sock_close+0x1b/0x30 net/socket.c:1139
 __fput+0x277/0x7a0 fs/file_table.c:210
 ____fput+0x16/0x20 fs/file_table.c:244
 task_work_run+0x119/0x190 kernel/task_work.c:113
 tracehook_notify_resume include/linux/tracehook.h:191 [inline]
 exit_to_usermode_loop+0x1da/0x220 arch/x86/entry/common.c:163
 prepare_exit_to_usermode arch/x86/entry/common.c:198 [inline]
 syscall_return_slowpath arch/x86/entry/common.c:267 [inline]
 do_syscall_64+0x4a9/0x630 arch/x86/entry/common.c:294
 entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x4129e1
RSP: 002b:00007fffaae57300 EFLAGS: 00000293 ORIG_RAX: 0000000000000003
RAX: 0000000000000000 RBX: 0000000000000006 RCX: 00000000004129e1
RDX: 0000000000000000 RSI: 0000000000000081 RDI: 0000000000000005
RBP: 0000000000740490 R08: 0000000000740488 R09: 00000000000c5949
R10: 00007fffaae573c0 R11: 0000000000000293 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000003 R15: 000000000073bf0c

Allocated by task 7390:
 save_stack_trace+0x16/0x20 arch/x86/kernel/stacktrace.c:59
 save_stack+0x45/0xd0 mm/kasan/kasan.c:447
 set_track mm/kasan/kasan.c:459 [inline]
 kasan_kmalloc mm/kasan/kasan.c:551 [inline]
 kasan_kmalloc+0xce/0xf0 mm/kasan/kasan.c:529
 __do_kmalloc mm/slab.c:3720 [inline]
 __kmalloc+0x15d/0x7a0 mm/slab.c:3729
 kmalloc include/linux/slab.h:493 [inline]
 sk_prot_alloc+0x171/0x2a0 net/core/sock.c:1470
 sk_alloc+0x39/0xd70 net/core/sock.c:1524
 pppol2tp_create+0x32/0x1f0 net/l2tp/l2tp_ppp.c:534
 pppox_create+0xfc/0x210 drivers/net/ppp/pppox.c:121
 __sock_create+0x2fb/0x620 net/socket.c:1275
 sock_create net/socket.c:1315 [inline]
 SYSC_socket net/socket.c:1345 [inline]
 SyS_socket+0xd3/0x170 net/socket.c:1325
 do_syscall_64+0x1eb/0x630 arch/x86/entry/common.c:289
 entry_SYSCALL_64_after_hwframe+0x42/0xb7

Freed by task 7387:
 save_stack_trace+0x16/0x20 arch/x86/kernel/stacktrace.c:59
 save_stack+0x45/0xd0 mm/kasan/kasan.c:447
 set_track mm/kasan/kasan.c:459 [inline]
 kasan_slab_free+0x75/0xc0 mm/kasan/kasan.c:524
 __cache_free mm/slab.c:3496 [inline]
 kfree+0xcc/0x270 mm/slab.c:3815
 sk_prot_free net/core/sock.c:1507 [inline]
 __sk_destruct+0x495/0x5d0 net/core/sock.c:1586
 sk_destruct+0x67/0x80 net/core/sock.c:1594
 __sk_free+0x54/0x230 net/core/sock.c:1602
 sk_free+0x35/0x40 net/core/sock.c:1613
 sock_put include/net/sock.h:1653 [inline]
 pppol2tp_session_sock_put+0x66/0x80 net/l2tp/l2tp_ppp.c:271
 l2tp_tunnel_closeall+0x288/0x390 net/l2tp/l2tp_core.c:1343
 l2tp_udp_encap_destroy+0x99/0x100 net/l2tp/l2tp_core.c:1366
 udpv6_destroy_sock+0xb6/0xd0 net/ipv6/udp.c:1444
 sk_common_release+0x6d/0x320 net/core/sock.c:2987
 udp_lib_close+0x16/0x20 include/net/udp.h:203
 inet_release+0xf2/0x1c0 net/ipv4/af_inet.c:425
 inet6_release+0x53/0x80 net/ipv6/af_inet6.c:450
 __sock_release+0xd3/0x2c0 net/socket.c:602
 sock_close+0x1b/0x30 net/socket.c:1139
 __fput+0x277/0x7a0 fs/file_table.c:210
 ____fput+0x16/0x20 fs/file_table.c:244
 task_work_run+0x119/0x190 kernel/task_work.c:113
 tracehook_notify_resume include/linux/tracehook.h:191 [inline]
 exit_to_usermode_loop+0x1da/0x220 arch/x86/entry/common.c:163
 prepare_exit_to_usermode arch/x86/entry/common.c:198 [inline]
 syscall_return_slowpath arch/x86/entry/common.c:267 [inline]
 do_syscall_64+0x4a9/0x630 arch/x86/entry/common.c:294
 entry_SYSCALL_64_after_hwframe+0x42/0xb7

The buggy address belongs to the object at ffff8880a9bca640
 which belongs to the cache kmalloc-2048 of size 2048
The buggy address is located 160 bytes inside of
 2048-byte region [ffff8880a9bca640, ffff8880a9bcae40)
The buggy address belongs to the page:
page:ffffea0002a6f280 count:1 mapcount:0 mapping:ffff8880a9bca640 index:0x0 compound_mapcount: 0
flags: 0x1fffc0000008100(slab|head)
raw: 01fffc0000008100 ffff8880a9bca640 0000000000000000 0000000100000003
raw: ffffea0002a4f120 ffffea00022a6fa0 ffff8880aa800c40 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8880a9bca580: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff8880a9bca600: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb
>ffff8880a9bca680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                                       ^
 ffff8880a9bca700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff8880a9bca780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================