================================================================== BUG: KCSAN: data-race in insert_work / wq_worker_running read-write to 0xffff888237c2c8e4 of 4 bytes by task 23758 on cpu 0: wq_worker_running+0x98/0x120 kernel/workqueue.c:1071 schedule_preempt_disabled+0x10/0x20 kernel/sched/core.c:6845 __mutex_lock_common kernel/locking/mutex.c:679 [inline] __mutex_lock+0x368/0x8d0 kernel/locking/mutex.c:747 __mutex_lock_slowpath+0xa/0x10 kernel/locking/mutex.c:1035 mutex_lock+0x28/0x30 kernel/locking/mutex.c:286 pcpu_balance_workfn+0x23/0xa80 mm/percpu.c:2233 process_one_work+0x434/0x860 kernel/workqueue.c:2600 worker_thread+0x5f2/0xa10 kernel/workqueue.c:2751 kthread+0x1d7/0x210 kernel/kthread.c:389 ret_from_fork+0x2e/0x40 arch/x86/kernel/process.c:145 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:304 read to 0xffff888237c2c8e4 of 4 bytes by task 1872 on cpu 1: __need_more_worker kernel/workqueue.c:830 [inline] insert_work+0x10e/0x190 kernel/workqueue.c:1563 __queue_work+0x722/0x980 kernel/workqueue.c:1717 queue_work_on+0x95/0xf0 kernel/workqueue.c:1747 queue_work include/linux/workqueue.h:506 [inline] schedule_work include/linux/workqueue.h:567 [inline] pcpu_schedule_balance_work mm/percpu.c:204 [inline] pcpu_alloc+0xaae/0x1280 mm/percpu.c:1871 __alloc_percpu_gfp+0x26/0x30 mm/percpu.c:1930 bpf_map_alloc_percpu+0xaa/0x200 kernel/bpf/syscall.c:464 prealloc_init kernel/bpf/hashtab.c:333 [inline] htab_map_alloc+0x8a1/0xde0 kernel/bpf/hashtab.c:560 map_create+0x713/0xa60 kernel/bpf/syscall.c:1206 __sys_bpf+0x62a/0x780 kernel/bpf/syscall.c:5119 __do_sys_bpf kernel/bpf/syscall.c:5241 [inline] __se_sys_bpf kernel/bpf/syscall.c:5239 [inline] __x64_sys_bpf+0x43/0x50 kernel/bpf/syscall.c:5239 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd value changed: 0x00000000 -> 0x00000001 Reported by Kernel Concurrency Sanitizer on: CPU: 1 PID: 1872 Comm: syz-executor.5 Not tainted 6.5.0-rc5-syzkaller-00353-gae545c3283dc #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/26/2023 ==================================================================