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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 ffff8880a18886f8 by task syz-executor.0/26677

CPU: 1 PID: 26677 Comm: syz-executor.0 Not tainted 4.19.211-syzkaller #0
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+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_bh include/linux/spinlock_api_smp.h:135 [inline]
 _raw_spin_lock_bh+0x2f/0x40 kernel/locking/spinlock.c:168
 bpf_tcp_remove+0x427/0xa00 kernel/bpf/sockmap.c:335
 bpf_tcp_close+0x12b/0x390 kernel/bpf/sockmap.c:403
 inet_release+0xd7/0x1e0 net/ipv4/af_inet.c:427
 __sock_release+0xcd/0x2a0 net/socket.c:599
 sock_close+0x15/0x20 net/socket.c:1214
 __fput+0x2ce/0x890 fs/file_table.c:278
 task_work_run+0x148/0x1c0 kernel/task_work.c:113
 exit_task_work include/linux/task_work.h:22 [inline]
 do_exit+0xbf3/0x2be0 kernel/exit.c:870
 do_group_exit+0x125/0x310 kernel/exit.c:967
 get_signal+0x3f2/0x1f70 kernel/signal.c:2589
 do_signal+0x8f/0x1670 arch/x86/kernel/signal.c:799
 exit_to_usermode_loop+0x204/0x2a0 arch/x86/entry/common.c:163
 prepare_exit_to_usermode arch/x86/entry/common.c:198 [inline]
 syscall_return_slowpath+0x3f0/0x4a0 arch/x86/entry/common.c:271
 ret_from_fork+0x15/0x30 arch/x86/entry/entry_64.S:407
RIP: 0033:0x7fdf452fd511
Code: Bad RIP value.
RSP: 002b:00007fdf43c502f0 EFLAGS: 00000206 ORIG_RAX: 0000000000000038
RAX: 0000000000000000 RBX: 00007fdf43c50700 RCX: 00007fdf452fd511
RDX: 00007fdf43c509d0 RSI: 00007fdf43c502f0 RDI: 00000000003d0f00
RBP: 00007fff4e687050 R08: 00007fdf43c50700 R09: 00007fdf43c50700
R10: 00007fdf43c509d0 R11: 0000000000000206 R12: 00007fff4e686ebe
R13: 00007fff4e686ebf R14: 00007fdf43c50300 R15: 0000000000022000

Allocated by task 26671:
 kmem_cache_alloc_trace+0x12f/0x380 mm/slab.c:3625
 kmalloc include/linux/slab.h:515 [inline]
 kzalloc include/linux/slab.h:709 [inline]
 sock_map_alloc kernel/bpf/sockmap.c:1675 [inline]
 sock_map_alloc+0x2b8/0x510 kernel/bpf/sockmap.c:1657
 find_and_alloc_map kernel/bpf/syscall.c:130 [inline]
 map_create kernel/bpf/syscall.c:510 [inline]
 __do_sys_bpf kernel/bpf/syscall.c:2408 [inline]
 __se_sys_bpf+0x82a/0x3a20 kernel/bpf/syscall.c:2384
 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293
 entry_SYSCALL_64_after_hwframe+0x49/0xbe

Freed by task 5543:
 __cache_free mm/slab.c:3503 [inline]
 kfree+0xcc/0x210 mm/slab.c:3822
 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

The buggy address belongs to the object at ffff8880a18885c0
 which belongs to the cache kmalloc-512 of size 512
The buggy address is located 312 bytes inside of
 512-byte region [ffff8880a18885c0, ffff8880a18887c0)
The buggy address belongs to the page:
page:ffffea0002862200 count:1 mapcount:0 mapping:ffff88813bff0940 index:0xffff8880a1888ac0
flags: 0xfff00000000100(slab)
raw: 00fff00000000100 ffffea00028d4a08 ffffea0002823b08 ffff88813bff0940
raw: ffff8880a1888ac0 ffff8880a18880c0 0000000100000004 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8880a1888580: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb
 ffff8880a1888600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff8880a1888680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                                                ^
 ffff8880a1888700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff8880a1888780: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
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