syzbot

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BUG: KCSAN: data-race in __htab_lru_percpu_map_update_elem / bpf_lru_pop_free

read to 0xffff888127397ee3 of 1 bytes by task 13890 on cpu 0:
 bpf_lru_node_set_ref kernel/bpf/bpf_lru_list.h:70 [inline]
 __htab_lru_percpu_map_update_elem+0x2d4/0x7f0 kernel/bpf/hashtab.c:1310
 bpf_percpu_hash_update+0x5a/0x90 kernel/bpf/hashtab.c:2282
 bpf_map_update_value+0x1dd/0x2f0 kernel/bpf/syscall.c:200
 generic_map_update_batch+0x36e/0x4d0 kernel/bpf/syscall.c:1657
 bpf_map_do_batch+0x373/0x3d0
 __sys_bpf+0x5d4/0x620
 __do_sys_bpf kernel/bpf/syscall.c:5057 [inline]
 __se_sys_bpf kernel/bpf/syscall.c:5055 [inline]
 __x64_sys_bpf+0x3f/0x50 kernel/bpf/syscall.c:5055
 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+0x63/0xcd

write to 0xffff888127397ee3 of 1 bytes by task 13899 on cpu 1:
 __bpf_lru_node_move_in kernel/bpf/bpf_lru_list.c:92 [inline]
 __local_list_flush kernel/bpf/bpf_lru_list.c:300 [inline]
 bpf_lru_list_pop_free_to_local kernel/bpf/bpf_lru_list.c:327 [inline]
 bpf_common_lru_pop_free kernel/bpf/bpf_lru_list.c:447 [inline]
 bpf_lru_pop_free+0x392/0xf00 kernel/bpf/bpf_lru_list.c:499
 prealloc_lru_pop kernel/bpf/hashtab.c:310 [inline]
 __htab_lru_percpu_map_update_elem+0xdb/0x7f0 kernel/bpf/hashtab.c:1294
 bpf_percpu_hash_update+0x5a/0x90 kernel/bpf/hashtab.c:2282
 bpf_map_update_value+0x1dd/0x2f0 kernel/bpf/syscall.c:200
 generic_map_update_batch+0x36e/0x4d0 kernel/bpf/syscall.c:1657
 bpf_map_do_batch+0x373/0x3d0
 __sys_bpf+0x5d4/0x620
 __do_sys_bpf kernel/bpf/syscall.c:5057 [inline]
 __se_sys_bpf kernel/bpf/syscall.c:5055 [inline]
 __x64_sys_bpf+0x3f/0x50 kernel/bpf/syscall.c:5055
 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+0x63/0xcd

value changed: 0x00 -> 0x01

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 13899 Comm: syz-executor.2 Not tainted 6.0.0-rc4-syzkaller-00284-gce888220d5c7-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/26/2022
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