syzbot

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BUG: KCSAN: data-race in __bpf_lru_list_shrink / __htab_lru_percpu_map_update_elem

write to 0xffff88802df222a3 of 1 bytes by task 1387 on cpu 1:
 bpf_lru_node_set_ref kernel/bpf/bpf_lru_list.h:70 [inline]
 __htab_lru_percpu_map_update_elem+0x414/0x780 kernel/bpf/hashtab.c:1235
 bpf_percpu_hash_update+0x5a/0x90 kernel/bpf/hashtab.c:1971
 bpf_map_update_value+0x1dd/0x300 kernel/bpf/syscall.c:177
 generic_map_update_batch+0x344/0x450 kernel/bpf/syscall.c:1351
 bpf_map_do_batch+0x2a8/0x310 kernel/bpf/syscall.c:3989
 __do_sys_bpf+0x8a3/0x99c0 kernel/bpf/syscall.c:4445
 __se_sys_bpf kernel/bpf/syscall.c:4339 [inline]
 __x64_sys_bpf+0x3d/0x50 kernel/bpf/syscall.c:4339
 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

read to 0xffff88802df222a3 of 1 bytes by task 1392 on cpu 0:
 bpf_lru_node_is_ref kernel/bpf/bpf_lru_list.c:44 [inline]
 __bpf_lru_list_shrink_inactive kernel/bpf/bpf_lru_list.c:218 [inline]
 __bpf_lru_list_shrink+0xd5/0x700 kernel/bpf/bpf_lru_list.c:266
 bpf_lru_list_pop_free_to_local kernel/bpf/bpf_lru_list.c:340 [inline]
 bpf_common_lru_pop_free kernel/bpf/bpf_lru_list.c:447 [inline]
 bpf_lru_pop_free+0x9c7/0xea0 kernel/bpf/bpf_lru_list.c:499
 prealloc_lru_pop kernel/bpf/hashtab.c:263 [inline]
 __htab_lru_percpu_map_update_elem+0xe0/0x780 kernel/bpf/hashtab.c:1219
 bpf_percpu_hash_update+0x5a/0x90 kernel/bpf/hashtab.c:1971
 bpf_map_update_value+0x1dd/0x300 kernel/bpf/syscall.c:177
 generic_map_update_batch+0x344/0x450 kernel/bpf/syscall.c:1351
 bpf_map_do_batch+0x2a8/0x310 kernel/bpf/syscall.c:3989
 __do_sys_bpf+0x8a3/0x99c0 kernel/bpf/syscall.c:4445
 __se_sys_bpf kernel/bpf/syscall.c:4339 [inline]
 __x64_sys_bpf+0x3d/0x50 kernel/bpf/syscall.c:4339
 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 1392 Comm: syz-executor.4 Not tainted 5.10.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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