syzbot

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BUG: KCSAN: data-race in bpf_lru_pop_free / htab_lru_map_update_elem

write to 0xffff88813831639b of 1 bytes by task 4900 on cpu 1:
 bpf_lru_node_set_ref kernel/bpf/bpf_lru_list.h:70 [inline]
 htab_lru_map_update_elem+0x44d/0x760 kernel/bpf/hashtab.c:1172
 bpf_map_update_value+0x1b9/0x2f0 kernel/bpf/syscall.c:224
 generic_map_update_batch+0x36e/0x4d0 kernel/bpf/syscall.c:1413
 bpf_map_do_batch+0x35d/0x3c0
 __sys_bpf+0x568/0x600
 __do_sys_bpf kernel/bpf/syscall.c:4767 [inline]
 __se_sys_bpf kernel/bpf/syscall.c:4765 [inline]
 __x64_sys_bpf+0x3f/0x50 kernel/bpf/syscall.c:4765
 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+0x44/0xae

read to 0xffff88813831639b of 1 bytes by task 4891 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:290 [inline]
 htab_lru_map_update_elem+0xb7/0x760 kernel/bpf/hashtab.c:1151
 bpf_map_update_value+0x1b9/0x2f0 kernel/bpf/syscall.c:224
 generic_map_update_batch+0x36e/0x4d0 kernel/bpf/syscall.c:1413
 bpf_map_do_batch+0x35d/0x3c0
 __sys_bpf+0x568/0x600
 __do_sys_bpf kernel/bpf/syscall.c:4767 [inline]
 __se_sys_bpf kernel/bpf/syscall.c:4765 [inline]
 __x64_sys_bpf+0x3f/0x50 kernel/bpf/syscall.c:4765
 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+0x44/0xae

value changed: 0x00 -> 0x01

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 4891 Comm: syz-executor.2 Not tainted 5.18.0-rc3-syzkaller-00235-g22da5264abf4-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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