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BUG: KASAN: use-after-free in __lock_acquire+0x2cb4/0x3ff0 kernel/locking/lockdep.c:3295
Read of size 8 at addr ffff888091eaae20 by task kworker/0:1/10816

CPU: 0 PID: 10816 Comm: kworker/0:1 Not tainted 4.19.211-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: events sco_sock_timeout
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x1fc/0x2ef lib/dump_stack.c:118
 print_address_description.cold+0x54/0x219 mm/kasan/report.c:256
 kasan_report_error.cold+0x8a/0x1b9 mm/kasan/report.c:354
 kasan_report mm/kasan/report.c:412 [inline]
 __asan_report_load8_noabort+0x88/0x90 mm/kasan/report.c:433
 __lock_acquire+0x2cb4/0x3ff0 kernel/locking/lockdep.c:3295
 lock_acquire+0x170/0x3c0 kernel/locking/lockdep.c:3908
 __raw_spin_lock include/linux/spinlock_api_smp.h:142 [inline]
 _raw_spin_lock+0x2a/0x40 kernel/locking/spinlock.c:144
 spin_lock include/linux/spinlock.h:329 [inline]
 sco_sock_timeout+0x7b/0x1b0 net/bluetooth/sco.c:95
 process_one_work+0x864/0x1570 kernel/workqueue.c:2153
 worker_thread+0x64c/0x1130 kernel/workqueue.c:2296
 kthread+0x33f/0x460 kernel/kthread.c:259
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415

Allocated by task 13154:
 __do_kmalloc mm/slab.c:3727 [inline]
 __kmalloc+0x15a/0x3c0 mm/slab.c:3736
 kmalloc include/linux/slab.h:520 [inline]
 sk_prot_alloc+0x1e2/0x2d0 net/core/sock.c:1483
 sk_alloc+0x36/0xec0 net/core/sock.c:1537
 pppol2tp_create+0x2d/0x1e0 net/l2tp/l2tp_ppp.c:514
 pppox_create+0x10c/0x220 drivers/net/ppp/pppox.c:134
 __sock_create+0x3d8/0x740 net/socket.c:1365
 sock_create net/socket.c:1416 [inline]
 __sys_socket+0xef/0x200 net/socket.c:1458
 __do_sys_socket net/socket.c:1467 [inline]
 __se_sys_socket net/socket.c:1465 [inline]
 __x64_sys_socket+0x6f/0xb0 net/socket.c:1465
 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293
 entry_SYSCALL_64_after_hwframe+0x49/0xbe

Freed by task 3564:
 __cache_free mm/slab.c:3503 [inline]
 kfree+0xcc/0x210 mm/slab.c:3822
 sk_prot_free net/core/sock.c:1520 [inline]
 __sk_destruct+0x684/0x8a0 net/core/sock.c:1602
 sk_destruct net/core/sock.c:1617 [inline]
 __sk_free+0x165/0x3b0 net/core/sock.c:1628
 sk_free+0x3b/0x50 net/core/sock.c:1639
 sock_put include/net/sock.h:1713 [inline]
 pppol2tp_put_sk+0x5a/0x70 net/l2tp/l2tp_ppp.c:412
 __rcu_reclaim kernel/rcu/rcu.h:236 [inline]
 rcu_do_batch kernel/rcu/tree.c:2584 [inline]
 invoke_rcu_callbacks kernel/rcu/tree.c:2897 [inline]
 __rcu_process_callbacks kernel/rcu/tree.c:2864 [inline]
 rcu_process_callbacks+0x8ff/0x18b0 kernel/rcu/tree.c:2881
 __do_softirq+0x265/0x980 kernel/softirq.c:292

The buggy address belongs to the object at ffff888091eaad80
 which belongs to the cache kmalloc-2048 of size 2048
The buggy address is located 160 bytes inside of
 2048-byte region [ffff888091eaad80, ffff888091eab580)
The buggy address belongs to the page:
page:ffffea000247aa80 count:1 mapcount:0 mapping:ffff88813bff0c40 index:0x0 compound_mapcount: 0
flags: 0xfff00000008100(slab|head)
raw: 00fff00000008100 ffffea00027aaf08 ffffea000131cf88 ffff88813bff0c40
raw: 0000000000000000 ffff888091eaa500 0000000100000003 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff888091eaad00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff888091eaad80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff888091eaae00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                               ^
 ffff888091eaae80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff888091eaaf00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
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