syzbot

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BUG: KCSAN: data-race in bpf_lru_pop_free / htab_lru_map_update_elem

write to 0xffff88809fd5d023 of 1 bytes by task 17376 on cpu 0:
 bpf_lru_node_set_ref kernel/bpf/bpf_lru_list.h:70 [inline]
 htab_lru_map_update_elem+0x4a1/0x680 kernel/bpf/hashtab.c:1061
 bpf_map_update_value.isra.0+0x3bc/0x420 kernel/bpf/syscall.c:203
 generic_map_update_batch+0x273/0x3c0 kernel/bpf/syscall.c:1326
 bpf_map_do_batch+0x194/0x3a0 kernel/bpf/syscall.c:3556
 __do_sys_bpf+0x1cca/0x3100 kernel/bpf/syscall.c:3767
 __se_sys_bpf kernel/bpf/syscall.c:3661 [inline]
 __x64_sys_bpf+0x47/0x60 kernel/bpf/syscall.c:3661
 do_syscall_64+0xc7/0x3b0 arch/x86/entry/common.c:295
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

read to 0xffff88809fd5d023 of 1 bytes by task 17361 on cpu 1:
 __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+0x6a4/0xa30 kernel/bpf/bpf_lru_list.c:499
 prealloc_lru_pop+0x30/0x70 kernel/bpf/hashtab.c:237
 htab_lru_map_update_elem+0x352/0x680 kernel/bpf/hashtab.c:1043
 bpf_map_update_value.isra.0+0x3bc/0x420 kernel/bpf/syscall.c:203
 generic_map_update_batch+0x273/0x3c0 kernel/bpf/syscall.c:1326
 bpf_map_do_batch+0x194/0x3a0 kernel/bpf/syscall.c:3556
 __do_sys_bpf+0x1cca/0x3100 kernel/bpf/syscall.c:3767
 __se_sys_bpf kernel/bpf/syscall.c:3661 [inline]
 __x64_sys_bpf+0x47/0x60 kernel/bpf/syscall.c:3661
 do_syscall_64+0xc7/0x3b0 arch/x86/entry/common.c:295
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 17361 Comm: syz-executor.2 Not tainted 5.7.0-rc1-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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