syzbot

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BUG: KCSAN: data-race in __bpf_lru_list_rotate / __htab_lru_percpu_map_update_elem

write to 0xffff888108d54fe3 of 1 bytes by task 27707 on cpu 1:
 __bpf_lru_node_move kernel/bpf/bpf_lru_list.c:113 [inline]
 __bpf_lru_list_rotate_active kernel/bpf/bpf_lru_list.c:149 [inline]
 __bpf_lru_list_rotate+0x1d3/0x7b0 kernel/bpf/bpf_lru_list.c:240
 bpf_percpu_lru_pop_free kernel/bpf/bpf_lru_list.c:412 [inline]
 bpf_lru_pop_free+0x87/0xe70 kernel/bpf/bpf_lru_list.c:497
 prealloc_lru_pop kernel/bpf/hashtab.c:293 [inline]
 __htab_lru_percpu_map_update_elem+0xd7/0x800 kernel/bpf/hashtab.c:1324
 bpf_percpu_hash_update+0x5a/0x90 kernel/bpf/hashtab.c:2324
 bpf_map_update_value+0x1dd/0x2f0 kernel/bpf/syscall.c:200
 generic_map_update_batch+0x37e/0x4e0 kernel/bpf/syscall.c:1656
 bpf_map_do_batch+0x373/0x3d0
 __sys_bpf+0x5d8/0x630
 __do_sys_bpf kernel/bpf/syscall.c:5069 [inline]
 __se_sys_bpf kernel/bpf/syscall.c:5067 [inline]
 __x64_sys_bpf+0x3f/0x50 kernel/bpf/syscall.c:5067
 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 0xffff888108d54fe3 of 1 bytes by task 27706 on cpu 0:
 bpf_lru_node_set_ref kernel/bpf/bpf_lru_list.h:70 [inline]
 __htab_lru_percpu_map_update_elem+0x2e9/0x800 kernel/bpf/hashtab.c:1340
 bpf_percpu_hash_update+0x5a/0x90 kernel/bpf/hashtab.c:2324
 bpf_map_update_value+0x1dd/0x2f0 kernel/bpf/syscall.c:200
 generic_map_update_batch+0x37e/0x4e0 kernel/bpf/syscall.c:1656
 bpf_map_do_batch+0x373/0x3d0
 __sys_bpf+0x5d8/0x630
 __do_sys_bpf kernel/bpf/syscall.c:5069 [inline]
 __se_sys_bpf kernel/bpf/syscall.c:5067 [inline]
 __x64_sys_bpf+0x3f/0x50 kernel/bpf/syscall.c:5067
 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: 0x01 -> 0x00

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 27706 Comm: syz-executor.4 Not tainted 6.1.0-rc7-syzkaller-00123-ga4412fdd49dc-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022
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