================================================================== BUG: KCSAN: data-race in kick_pool / wq_worker_running read-write to 0xffff888237c2b664 of 4 bytes by task 3395 on cpu 0: wq_worker_running+0x95/0x120 kernel/workqueue.c:1400 schedule_preempt_disabled+0x10/0x20 kernel/sched/core.c:6935 __mutex_lock_common kernel/locking/mutex.c:679 [inline] __mutex_lock+0x414/0xa50 kernel/locking/mutex.c:747 __mutex_lock_slowpath+0xa/0x10 kernel/locking/mutex.c:1035 mutex_lock+0x27/0x30 kernel/locking/mutex.c:278 pcpu_balance_workfn+0x4a/0xc00 mm/percpu.c:2200 process_one_work kernel/workqueue.c:3238 [inline] process_scheduled_works+0x4cb/0x9d0 kernel/workqueue.c:3321 worker_thread+0x582/0x770 kernel/workqueue.c:3402 kthread+0x486/0x510 kernel/kthread.c:464 ret_from_fork+0xda/0x150 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 read to 0xffff888237c2b664 of 4 bytes by task 6413 on cpu 1: need_more_worker kernel/workqueue.c:934 [inline] kick_pool+0x49/0x2d0 kernel/workqueue.c:1240 __queue_work+0x8d6/0xb60 kernel/workqueue.c:2342 queue_work_on+0xd1/0x160 kernel/workqueue.c:2392 queue_work include/linux/workqueue.h:662 [inline] schedule_work include/linux/workqueue.h:723 [inline] pcpu_schedule_balance_work mm/percpu.c:204 [inline] pcpu_alloc_noprof+0x9a4/0x1210 mm/percpu.c:1856 bpf_map_alloc_percpu+0xb3/0x200 kernel/bpf/syscall.c:556 prealloc_init+0x19f/0x490 kernel/bpf/hashtab.c:336 htab_map_alloc+0x4ba/0x6d0 kernel/bpf/hashtab.c:561 map_create+0x843/0xb90 kernel/bpf/syscall.c:1477 __sys_bpf+0x5ab/0x790 kernel/bpf/syscall.c:5818 __do_sys_bpf kernel/bpf/syscall.c:5943 [inline] __se_sys_bpf kernel/bpf/syscall.c:5941 [inline] __x64_sys_bpf+0x41/0x50 kernel/bpf/syscall.c:5941 x64_sys_call+0x2478/0x2fb0 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: 6413 Comm: syz.4.1104 Not tainted 6.15.0-syzkaller-12141-gec7714e49479 #0 PREEMPT(voluntary) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 ==================================================================