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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+0x64/0x240 kernel/workqueue.c:1508
 sched_tick+0xbc/0x1f0 kernel/sched/core.c:5677
 update_process_times+0x15e/0x190 kernel/time/timer.c:2480
 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:1930 [inline]
 __hrtimer_run_queues+0x276/0x4f0 kernel/time/hrtimer.c:1994
 hrtimer_interrupt+0x261/0x850 kernel/time/hrtimer.c:2113
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1050 [inline]
 __sysvec_apic_timer_interrupt+0x5f/0x1c0 arch/x86/kernel/apic/apic.c:1067
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1061 [inline]
 sysvec_apic_timer_interrupt+0x6f/0x80 arch/x86/kernel/apic/apic.c:1061
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
 native_ptep_get_and_clear arch/x86/include/asm/pgtable_64.h:90 [inline]
 ptep_get_and_clear arch/x86/include/asm/pgtable.h:1246 [inline]
 vunmap_pte_range mm/vmalloc.c:389 [inline]
 vunmap_pmd_range mm/vmalloc.c:418 [inline]
 vunmap_pud_range mm/vmalloc.c:445 [inline]
 vunmap_p4d_range mm/vmalloc.c:465 [inline]
 __vunmap_range_noflush+0x596/0x7d0 mm/vmalloc.c:496
 vunmap_range_noflush mm/vmalloc.c:506 [inline]
 free_unmap_vmap_area mm/vmalloc.c:2477 [inline]
 remove_vm_area+0x81/0xc0 mm/vmalloc.c:3334
 free_vm_area+0x1f/0x40 mm/vmalloc.c:4785
 arena_map_free+0xb6/0xe0 kernel/bpf/arena.c:290
 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:3302 [inline]
 process_scheduled_works+0x4f0/0x9c0 kernel/workqueue.c:3385
 worker_thread+0x58a/0x780 kernel/workqueue.c:3466
 kthread+0x22a/0x280 kernel/kthread.c:436
 ret_from_fork+0x146/0x330 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+0x64/0x240 kernel/workqueue.c:1508
 sched_tick+0xbc/0x1f0 kernel/sched/core.c:5677
 update_process_times+0x15e/0x190 kernel/time/timer.c:2480
 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:1930 [inline]
 __hrtimer_run_queues+0x276/0x4f0 kernel/time/hrtimer.c:1994
 hrtimer_interrupt+0x261/0x850 kernel/time/hrtimer.c:2113
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1050 [inline]
 __sysvec_apic_timer_interrupt+0x5f/0x1c0 arch/x86/kernel/apic/apic.c:1067
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1061 [inline]
 sysvec_apic_timer_interrupt+0x6f/0x80 arch/x86/kernel/apic/apic.c:1061
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
 __sanitizer_cov_trace_pc+0x5c/0x70 kernel/kcov.c:233
 vunmap_pte_range mm/vmalloc.c:390 [inline]
 vunmap_pmd_range mm/vmalloc.c:418 [inline]
 vunmap_pud_range mm/vmalloc.c:445 [inline]
 vunmap_p4d_range mm/vmalloc.c:465 [inline]
 __vunmap_range_noflush+0x5c7/0x7d0 mm/vmalloc.c:496
 vunmap_range_noflush mm/vmalloc.c:506 [inline]
 free_unmap_vmap_area mm/vmalloc.c:2477 [inline]
 remove_vm_area+0x81/0xc0 mm/vmalloc.c:3334
 free_vm_area+0x1f/0x40 mm/vmalloc.c:4785
 arena_map_free+0xb6/0xe0 kernel/bpf/arena.c:290
 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:3302 [inline]
 process_scheduled_works+0x4f0/0x9c0 kernel/workqueue.c:3385
 worker_thread+0x58a/0x780 kernel/workqueue.c:3466
 kthread+0x22a/0x280 kernel/kthread.c:436
 ret_from_fork+0x146/0x330 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245

value changed: 0x00000000001a8ce0 -> 0x00000000001ab3f0

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 UID: 0 PID: 3769 Comm: kworker/u8:9 Tainted: G        W           syzkaller #0 PREEMPT(full) 
Tainted: [W]=WARN
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026
Workqueue: events_unbound bpf_map_free_deferred
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