================================================================== BUG: KCSAN: data-race in pcpu_alloc / pcpu_alloc read-write to 0xffffffff86ea39bc of 4 bytes by task 8087 on cpu 0: pcpu_reintegrate_chunk mm/percpu.c:588 [inline] pcpu_alloc+0x6e2/0x1020 mm/percpu.c:1815 __alloc_percpu_gfp+0x22/0x30 mm/percpu.c:1937 bpf_map_alloc_percpu+0xab/0x120 kernel/bpf/syscall.c:462 prealloc_init kernel/bpf/hashtab.c:346 [inline] htab_map_alloc+0x76e/0xc00 kernel/bpf/hashtab.c:558 find_and_alloc_map kernel/bpf/syscall.c:131 [inline] map_create+0x38a/0x710 kernel/bpf/syscall.c:1082 __sys_bpf+0x296/0x630 kernel/bpf/syscall.c:4899 __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 0xffffffff86ea39bc of 4 bytes by task 8078 on cpu 1: pcpu_alloc+0x9cb/0x1020 mm/percpu.c:1877 __alloc_percpu_gfp+0x22/0x30 mm/percpu.c:1937 bpf_map_alloc_percpu+0xab/0x120 kernel/bpf/syscall.c:462 prealloc_init kernel/bpf/hashtab.c:346 [inline] htab_map_alloc+0x76e/0xc00 kernel/bpf/hashtab.c:558 find_and_alloc_map kernel/bpf/syscall.c:131 [inline] map_create+0x38a/0x710 kernel/bpf/syscall.c:1082 __sys_bpf+0x296/0x630 kernel/bpf/syscall.c:4899 __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: 0x00000002 -> 0xfffffffa Reported by Kernel Concurrency Sanitizer on: CPU: 1 PID: 8078 Comm: syz-executor.1 Not tainted 5.19.0-rc7-syzkaller-dirty #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/29/2022 ==================================================================