================================================================== BUG: KCSAN: data-race in kick_pool / wq_worker_running read-write to 0xffff888237c29de4 of 4 bytes by task 9 on cpu 0: wq_worker_running+0x95/0x120 kernel/workqueue.c:1406 schedule_preempt_disabled+0x10/0x20 kernel/sched/core.c:7083 __mutex_lock_common kernel/locking/mutex.c:676 [inline] __mutex_lock+0x467/0xcc0 kernel/locking/mutex.c:760 __mutex_lock_slowpath+0xa/0x10 kernel/locking/mutex.c:1049 mutex_lock+0x27/0x30 kernel/locking/mutex.c:274 pcpu_balance_workfn+0x4a/0xc00 mm/percpu.c:2204 process_one_work kernel/workqueue.c:3263 [inline] process_scheduled_works+0x4cb/0x9d0 kernel/workqueue.c:3346 worker_thread+0x582/0x770 kernel/workqueue.c:3427 kthread+0x486/0x510 kernel/kthread.c:463 ret_from_fork+0x11f/0x1b0 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 read to 0xffff888237c29de4 of 4 bytes by task 18149 on cpu 1: need_more_worker kernel/workqueue.c:940 [inline] kick_pool+0x49/0x2d0 kernel/workqueue.c:1246 __queue_work+0x8cb/0xb50 kernel/workqueue.c:2342 queue_work_on+0xd1/0x160 kernel/workqueue.c:2392 queue_work include/linux/workqueue.h:669 [inline] schedule_work include/linux/workqueue.h:730 [inline] pcpu_schedule_balance_work mm/percpu.c:204 [inline] pcpu_alloc_noprof+0x9a7/0x1250 mm/percpu.c:1856 bpf_prog_alloc_no_stats+0xf7/0x3b0 kernel/bpf/core.c:115 bpf_prog_alloc+0x3c/0x150 kernel/bpf/core.c:153 bpf_prog_load+0x506/0x1100 kernel/bpf/syscall.c:2966 __sys_bpf+0x469/0x7c0 kernel/bpf/syscall.c:6134 __do_sys_bpf kernel/bpf/syscall.c:6244 [inline] __se_sys_bpf kernel/bpf/syscall.c:6242 [inline] __x64_sys_bpf+0x41/0x50 kernel/bpf/syscall.c:6242 x64_sys_call+0x2aee/0x3000 arch/x86/include/generated/asm/syscalls_64.h:322 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xd2/0x200 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f value changed: 0x00000000 -> 0x00000001 Reported by Kernel Concurrency Sanitizer on: CPU: 1 UID: 0 PID: 18149 Comm: syz.0.6130 Tainted: G W syzkaller #0 PREEMPT(voluntary) Tainted: [W]=WARN Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025 ==================================================================