================================================================== BUG: KCSAN: data-race in pcpu_alloc_noprof / pcpu_block_update_hint_alloc read-write to 0xffffffff88be03ac of 4 bytes by task 8942 on cpu 0: pcpu_update_empty_pages mm/percpu.c:602 [inline] pcpu_block_update_hint_alloc+0x5db/0x6a0 mm/percpu.c:923 pcpu_alloc_area+0x488/0x4b0 mm/percpu.c:1258 pcpu_alloc_noprof+0x4bb/0x10a0 mm/percpu.c:1834 bpf_map_alloc_percpu+0xad/0x210 kernel/bpf/syscall.c:466 prealloc_init+0x19f/0x470 kernel/bpf/hashtab.c:341 htab_map_alloc+0x630/0x8e0 kernel/bpf/hashtab.c:579 map_create+0x850/0xb70 kernel/bpf/syscall.c:1341 __sys_bpf+0x667/0x7a0 kernel/bpf/syscall.c:5635 __do_sys_bpf kernel/bpf/syscall.c:5760 [inline] __se_sys_bpf kernel/bpf/syscall.c:5758 [inline] __x64_sys_bpf+0x43/0x50 kernel/bpf/syscall.c:5758 x64_sys_call+0x2625/0x2d60 arch/x86/include/generated/asm/syscalls_64.h:322 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xc9/0x1c0 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f read to 0xffffffff88be03ac of 4 bytes by task 8944 on cpu 1: pcpu_alloc_noprof+0x9b6/0x10a0 mm/percpu.c:1894 pcpu_freelist_init+0x2c/0x160 kernel/bpf/percpu_freelist.c:10 prealloc_elems_and_freelist+0x79/0xf0 kernel/bpf/stackmap.c:56 stack_map_alloc+0x276/0x2b0 kernel/bpf/stackmap.c:114 map_create+0x850/0xb70 kernel/bpf/syscall.c:1341 __sys_bpf+0x667/0x7a0 kernel/bpf/syscall.c:5635 __do_sys_bpf kernel/bpf/syscall.c:5760 [inline] __se_sys_bpf kernel/bpf/syscall.c:5758 [inline] __x64_sys_bpf+0x43/0x50 kernel/bpf/syscall.c:5758 x64_sys_call+0x2625/0x2d60 arch/x86/include/generated/asm/syscalls_64.h:322 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xc9/0x1c0 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f value changed: 0x00000002 -> 0xfffffffa Reported by Kernel Concurrency Sanitizer on: CPU: 1 UID: 0 PID: 8944 Comm: syz.1.2653 Not tainted 6.12.0-rc5-syzkaller-00299-g11066801dd4b #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 ==================================================================