================================================================== BUG: KCSAN: data-race in wq_worker_tick / wq_worker_tick read-write to 0xffff8881000c5ed8 of 8 bytes by interrupt on cpu 1: wq_worker_tick+0x60/0x230 kernel/workqueue.c:1493 sched_tick+0xda/0x210 kernel/sched/core.c:5585 update_process_times+0x15e/0x190 kernel/time/timer.c:2479 tick_sched_handle kernel/time/tick-sched.c:298 [inline] tick_nohz_handler+0x275/0x3d0 kernel/time/tick-sched.c:319 __run_hrtimer kernel/time/hrtimer.c:1785 [inline] __hrtimer_run_queues+0x218/0x4f0 kernel/time/hrtimer.c:1849 hrtimer_interrupt+0x269/0x810 kernel/time/hrtimer.c:1911 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1045 [inline] __sysvec_apic_timer_interrupt+0x5f/0x1f0 arch/x86/kernel/apic/apic.c:1062 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1056 [inline] sysvec_apic_timer_interrupt+0x6f/0x80 arch/x86/kernel/apic/apic.c:1056 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697 free_frozen_page_commit+0x121/0x3b0 mm/page_alloc.c:2898 __free_frozen_pages+0x282/0x530 mm/page_alloc.c:3005 vfree+0x20e/0x3a0 mm/vmalloc.c:3479 bpf_map_area_free+0x15/0x20 kernel/bpf/syscall.c:421 htab_free_elems kernel/bpf/hashtab.c:284 [inline] prealloc_destroy kernel/bpf/hashtab.c:375 [inline] htab_map_free+0x5e9/0x6e0 kernel/bpf/hashtab.c:1637 bpf_map_free+0x113/0x220 kernel/bpf/syscall.c:892 bpf_map_free_deferred+0x8c/0x100 kernel/bpf/syscall.c:919 process_one_work kernel/workqueue.c:3275 [inline] process_scheduled_works+0x4de/0x9e0 kernel/workqueue.c:3358 worker_thread+0x581/0x770 kernel/workqueue.c:3439 kthread+0x22a/0x280 kernel/kthread.c:436 ret_from_fork+0x150/0x360 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 read-write to 0xffff8881000c5ed8 of 8 bytes by interrupt on cpu 0: wq_worker_tick+0x60/0x230 kernel/workqueue.c:1493 sched_tick+0xda/0x210 kernel/sched/core.c:5585 update_process_times+0x15e/0x190 kernel/time/timer.c:2479 tick_sched_handle kernel/time/tick-sched.c:298 [inline] tick_nohz_handler+0x275/0x3d0 kernel/time/tick-sched.c:319 __run_hrtimer kernel/time/hrtimer.c:1785 [inline] __hrtimer_run_queues+0x218/0x4f0 kernel/time/hrtimer.c:1849 hrtimer_interrupt+0x269/0x810 kernel/time/hrtimer.c:1911 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1045 [inline] __sysvec_apic_timer_interrupt+0x5f/0x1f0 arch/x86/kernel/apic/apic.c:1062 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1056 [inline] sysvec_apic_timer_interrupt+0x6f/0x80 arch/x86/kernel/apic/apic.c:1056 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697 free_frozen_page_commit+0xed/0x3b0 mm/page_alloc.c:2895 __free_frozen_pages+0x282/0x530 mm/page_alloc.c:3005 vfree+0x20e/0x3a0 mm/vmalloc.c:3479 bpf_map_area_free+0x15/0x20 kernel/bpf/syscall.c:421 htab_free_elems kernel/bpf/hashtab.c:284 [inline] prealloc_destroy kernel/bpf/hashtab.c:375 [inline] htab_map_free+0x5e9/0x6e0 kernel/bpf/hashtab.c:1637 bpf_map_free+0x113/0x220 kernel/bpf/syscall.c:892 bpf_map_free_deferred+0x8c/0x100 kernel/bpf/syscall.c:919 process_one_work kernel/workqueue.c:3275 [inline] process_scheduled_works+0x4de/0x9e0 kernel/workqueue.c:3358 worker_thread+0x581/0x770 kernel/workqueue.c:3439 kthread+0x22a/0x280 kernel/kthread.c:436 ret_from_fork+0x150/0x360 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 value changed: 0x000000000060e4b0 -> 0x0000000000610bc0 Reported by Kernel Concurrency Sanitizer on: CPU: 0 UID: 0 PID: 2951 Comm: kworker/u8:14 Tainted: G W syzkaller #0 PREEMPT(full) Tainted: [W]=WARN Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026 Workqueue: events_unbound bpf_map_free_deferred ================================================================== GRED: Unable to relocate VQ 0x0 after dequeue, screwing up backlog GRED: Unable to relocate VQ 0x0 after dequeue, screwing up backlog