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BUG: KASAN: use-after-free in __lock_acquire+0x37c2/0x4ec0 kernel/locking/lockdep.c:3290
Read of size 8 at addr ffff8801cb29f938 by task syz-executor2/9106

CPU: 1 PID: 9106 Comm: syz-executor2 Not tainted 4.19.0-rc4-next-20180921+ #77
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x1d3/0x2c4 lib/dump_stack.c:113
 print_address_description.cold.8+0x9/0x1ff mm/kasan/report.c:256
 kasan_report_error mm/kasan/report.c:354 [inline]
 kasan_report.cold.9+0x242/0x309 mm/kasan/report.c:412
 __asan_report_load8_noabort+0x14/0x20 mm/kasan/report.c:433
 __lock_acquire+0x37c2/0x4ec0 kernel/locking/lockdep.c:3290
 lock_acquire+0x1ed/0x520 kernel/locking/lockdep.c:3900
 __raw_spin_lock_bh include/linux/spinlock_api_smp.h:135 [inline]
 _raw_spin_lock_bh+0x31/0x40 kernel/locking/spinlock.c:168
 bpf_tcp_close+0x670/0x10c0 kernel/bpf/sockmap.c:349
 inet_release+0x104/0x1f0 net/ipv4/af_inet.c:428
 __sock_release+0xd7/0x250 net/socket.c:580
 sock_close+0x19/0x20 net/socket.c:1142
 __fput+0x3bc/0xa70 fs/file_table.c:279
 ____fput+0x15/0x20 fs/file_table.c:312
 task_work_run+0x1e8/0x2a0 kernel/task_work.c:113
 tracehook_notify_resume include/linux/tracehook.h:193 [inline]
 exit_to_usermode_loop+0x318/0x380 arch/x86/entry/common.c:166
 prepare_exit_to_usermode arch/x86/entry/common.c:197 [inline]
 syscall_return_slowpath arch/x86/entry/common.c:268 [inline]
 do_syscall_64+0x6be/0x820 arch/x86/entry/common.c:293
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x411151
Code: 75 14 b8 03 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 34 19 00 00 c3 48 83 ec 08 e8 0a fc ff ff 48 89 04 24 b8 03 00 00 00 0f 05 <48> 8b 3c 24 48 89 c2 e8 53 fc ff ff 48 89 d0 48 83 c4 08 48 3d 01
RSP: 002b:00007ffd6dc63210 EFLAGS: 00000293 ORIG_RAX: 0000000000000003
RAX: 0000000000000000 RBX: 0000000000000007 RCX: 0000000000411151
RDX: 0000000000000000 RSI: 00000000007308e8 RDI: 0000000000000006
RBP: 0000000000000000 R08: 0000000000000000 R09: ffffffffffffffff
R10: 000000000072bf00 R11: 0000000000000293 R12: 000000000000000c
R13: 000000000003fc42 R14: 0000000000000042 R15: badc0ffeebadface

Allocated by task 9113:
 save_stack+0x43/0xd0 mm/kasan/kasan.c:448
 set_track mm/kasan/kasan.c:460 [inline]
 kasan_kmalloc+0xc7/0xe0 mm/kasan/kasan.c:553
 kmem_cache_alloc_trace+0x152/0x750 mm/slab.c:3620
 kmalloc include/linux/slab.h:546 [inline]
 kzalloc include/linux/slab.h:741 [inline]
 sock_map_alloc+0x201/0x420 kernel/bpf/sockmap.c:1653
 find_and_alloc_map kernel/bpf/syscall.c:129 [inline]
 map_create+0x3bd/0x10f0 kernel/bpf/syscall.c:509
 __do_sys_bpf kernel/bpf/syscall.c:2364 [inline]
 __se_sys_bpf kernel/bpf/syscall.c:2341 [inline]
 __x64_sys_bpf+0x303/0x510 kernel/bpf/syscall.c:2341
 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x49/0xbe

Freed by task 22:
 save_stack+0x43/0xd0 mm/kasan/kasan.c:448
 set_track mm/kasan/kasan.c:460 [inline]
 __kasan_slab_free+0x102/0x150 mm/kasan/kasan.c:521
 kasan_slab_free+0xe/0x10 mm/kasan/kasan.c:528
 __cache_free mm/slab.c:3498 [inline]
 kfree+0xcf/0x230 mm/slab.c:3813
 sock_map_remove_complete kernel/bpf/sockmap.c:1561 [inline]
 sock_map_free+0x424/0x570 kernel/bpf/sockmap.c:1756
 bpf_map_free_deferred+0xba/0xf0 kernel/bpf/syscall.c:290
 process_one_work+0xc8b/0x1b80 kernel/workqueue.c:2153
 worker_thread+0x17f/0x1390 kernel/workqueue.c:2296
 kthread+0x35a/0x440 kernel/kthread.c:246
 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:352

The buggy address belongs to the object at ffff8801cb29f800
 which belongs to the cache kmalloc-512 of size 512
The buggy address is located 312 bytes inside of
 512-byte region [ffff8801cb29f800, ffff8801cb29fa00)
The buggy address belongs to the page:
page:ffffea00072ca7c0 count:1 mapcount:0 mapping:ffff8801da800940 index:0x0
flags: 0x2fffc0000000200(slab)
raw: 02fffc0000000200 ffffea0007366b48 ffffea0006fde0c8 ffff8801da800940
raw: 0000000000000000 ffff8801cb29f080 0000000100000006 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8801cb29f800: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff8801cb29f880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff8801cb29f900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                        ^
 ffff8801cb29f980: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff8801cb29fa00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
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