syzbot

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BUG: KCSAN: data-race in bpf_lru_pop_free / htab_lru_map_update_elem

write to 0xffff888021a7b8cb of 1 bytes by task 23435 on cpu 0:
 bpf_lru_node_set_ref kernel/bpf/bpf_lru_list.h:70 [inline]
 htab_lru_map_update_elem+0x370/0x430 kernel/bpf/hashtab.c:1067
 bpf_map_update_value+0x1bc/0x330 kernel/bpf/syscall.c:201
 generic_map_update_batch+0x344/0x450 kernel/bpf/syscall.c:1347
 bpf_map_do_batch+0x2a8/0x310 kernel/bpf/syscall.c:4007
 __do_sys_bpf+0x8a3/0x9aa0 kernel/bpf/syscall.c:4463
 __se_sys_bpf kernel/bpf/syscall.c:4357 [inline]
 __x64_sys_bpf+0x3d/0x50 kernel/bpf/syscall.c:4357
 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

read to 0xffff888021a7b8cb of 1 bytes by task 23436 on cpu 1:
 bpf_lru_node_is_ref kernel/bpf/bpf_lru_list.c:44 [inline]
 __local_list_pop_pending kernel/bpf/bpf_lru_list.c:384 [inline]
 bpf_common_lru_pop_free kernel/bpf/bpf_lru_list.c:476 [inline]
 bpf_lru_pop_free+0xb49/0xea0 kernel/bpf/bpf_lru_list.c:499
 prealloc_lru_pop kernel/bpf/hashtab.c:238 [inline]
 htab_lru_map_update_elem+0xb1/0x430 kernel/bpf/hashtab.c:1049
 bpf_map_update_value+0x1bc/0x330 kernel/bpf/syscall.c:201
 generic_map_update_batch+0x344/0x450 kernel/bpf/syscall.c:1347
 bpf_map_do_batch+0x2a8/0x310 kernel/bpf/syscall.c:4007
 __do_sys_bpf+0x8a3/0x9aa0 kernel/bpf/syscall.c:4463
 __se_sys_bpf kernel/bpf/syscall.c:4357 [inline]
 __x64_sys_bpf+0x3d/0x50 kernel/bpf/syscall.c:4357
 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: 1 PID: 23436 Comm: syz-executor.2 Not tainted 5.10.0-rc3-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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