syzbot

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BUG: KCSAN: data-race in __bpf_lru_list_shrink / __htab_lru_percpu_map_update_elem

write to 0xffff88812fee08a3 of 1 bytes by task 27892 on cpu 1:
 bpf_lru_node_set_ref kernel/bpf/bpf_lru_list.h:71 [inline]
 __htab_lru_percpu_map_update_elem+0x431/0x920 kernel/bpf/hashtab.c:1314
 bpf_percpu_hash_update+0x5a/0x90 kernel/bpf/hashtab.c:2284
 bpf_map_update_value+0x1dd/0x2f0 kernel/bpf/syscall.c:200
 generic_map_update_batch+0x36e/0x4d0 kernel/bpf/syscall.c:1637
 bpf_map_do_batch+0x373/0x3d0
 __sys_bpf+0x5b7/0x630
 __do_sys_bpf kernel/bpf/syscall.c:5021 [inline]
 __se_sys_bpf kernel/bpf/syscall.c:5019 [inline]
 __x64_sys_bpf+0x3f/0x50 kernel/bpf/syscall.c:5019
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x46/0xb0

read to 0xffff88812fee08a3 of 1 bytes by task 27905 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_percpu_lru_pop_free kernel/bpf/bpf_lru_list.c:416 [inline]
 bpf_lru_pop_free+0x15e/0xe90 kernel/bpf/bpf_lru_list.c:497
 prealloc_lru_pop kernel/bpf/hashtab.c:310 [inline]
 __htab_lru_percpu_map_update_elem+0xec/0x920 kernel/bpf/hashtab.c:1298
 bpf_percpu_hash_update+0x5a/0x90 kernel/bpf/hashtab.c:2284
 bpf_map_update_value+0x1dd/0x2f0 kernel/bpf/syscall.c:200
 generic_map_update_batch+0x36e/0x4d0 kernel/bpf/syscall.c:1637
 bpf_map_do_batch+0x373/0x3d0
 __sys_bpf+0x5b7/0x630
 __do_sys_bpf kernel/bpf/syscall.c:5021 [inline]
 __se_sys_bpf kernel/bpf/syscall.c:5019 [inline]
 __x64_sys_bpf+0x3f/0x50 kernel/bpf/syscall.c:5019
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x46/0xb0

value changed: 0x00 -> 0x01

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 27905 Comm: syz-executor.5 Tainted: G        W         5.18.0-syzkaller-11439-g8ab2afa23bd1-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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