syzbot

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BUG: KCSAN: data-race in bpf_lru_pop_free / htab_lru_map_update_elem

write to 0xffff88815dec3023 of 1 bytes by task 14911 on cpu 0:
 bpf_lru_node_set_ref kernel/bpf/bpf_lru_list.h:71 [inline]
 htab_lru_map_update_elem+0x49a/0x650 kernel/bpf/hashtab.c:1231
 bpf_map_update_value+0x318/0x370 kernel/bpf/syscall.c:230
 generic_map_update_batch+0x3ae/0x4f0 kernel/bpf/syscall.c:1702
 bpf_map_do_batch+0x2d9/0x3d0 kernel/bpf/syscall.c:4559
 __sys_bpf+0x317/0x800
 __do_sys_bpf kernel/bpf/syscall.c:5162 [inline]
 __se_sys_bpf kernel/bpf/syscall.c:5160 [inline]
 __x64_sys_bpf+0x43/0x50 kernel/bpf/syscall.c:5160
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

read to 0xffff88815dec3023 of 1 bytes by task 14910 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+0x9a7/0xe20 kernel/bpf/bpf_lru_list.c:499
 prealloc_lru_pop kernel/bpf/hashtab.c:301 [inline]
 htab_lru_map_update_elem+0xb4/0x650 kernel/bpf/hashtab.c:1210
 bpf_map_update_value+0x318/0x370 kernel/bpf/syscall.c:230
 generic_map_update_batch+0x3ae/0x4f0 kernel/bpf/syscall.c:1702
 bpf_map_do_batch+0x2d9/0x3d0 kernel/bpf/syscall.c:4559
 __sys_bpf+0x317/0x800
 __do_sys_bpf kernel/bpf/syscall.c:5162 [inline]
 __se_sys_bpf kernel/bpf/syscall.c:5160 [inline]
 __x64_sys_bpf+0x43/0x50 kernel/bpf/syscall.c:5160
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x41/0xc0 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: 14910 Comm: syz-executor.4 Not tainted 6.4.0-rc5-syzkaller-00016-ga4d7d7011219 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/25/2023
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