syzbot

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BUG: KCSAN: data-race in bpf_lru_pop_free / htab_lru_map_update_elem

write to 0xffff888106be78b3 of 1 bytes by task 21075 on cpu 1:
 bpf_lru_node_set_ref kernel/bpf/bpf_lru_list.h:71 [inline]
 htab_lru_map_update_elem+0x48a/0x870 kernel/bpf/hashtab.c:1195
 bpf_map_update_value+0x1b9/0x2f0 kernel/bpf/syscall.c:226
 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+0x63/0xcd

read to 0xffff888106be78b3 of 1 bytes by task 21068 on cpu 0:
 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+0xa19/0xe90 kernel/bpf/bpf_lru_list.c:499
 prealloc_lru_pop kernel/bpf/hashtab.c:310 [inline]
 htab_lru_map_update_elem+0xb7/0x870 kernel/bpf/hashtab.c:1174
 bpf_map_update_value+0x1b9/0x2f0 kernel/bpf/syscall.c:226
 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+0x63/0xcd

value changed: 0x00 -> 0x01

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 21068 Comm: syz-executor.3 Not tainted 5.19.0-rc8-syzkaller-00105-g6e2c0490769e-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/22/2022
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