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BUG: KCSAN: data-race in wq_worker_tick / wq_worker_tick

read-write to 0xffff8881010a02b8 of 8 bytes by interrupt on cpu 0:
 wq_worker_tick+0x63/0x240 kernel/workqueue.c:1474
 sched_tick+0x116/0x260 kernel/sched/core.c:5677
 update_process_times+0x161/0x190 kernel/time/timer.c:2520
 tick_sched_handle kernel/time/tick-sched.c:276 [inline]
 tick_nohz_handler+0x250/0x2d0 kernel/time/tick-sched.c:297
 __run_hrtimer kernel/time/hrtimer.c:1761 [inline]
 __hrtimer_run_queues+0x221/0x5f0 kernel/time/hrtimer.c:1825
 hrtimer_interrupt+0x235/0x4a0 kernel/time/hrtimer.c:1887
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1038 [inline]
 __sysvec_apic_timer_interrupt+0x5c/0x1d0 arch/x86/kernel/apic/apic.c:1055
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1049 [inline]
 sysvec_apic_timer_interrupt+0x6e/0x80 arch/x86/kernel/apic/apic.c:1049
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
 rcu_preempt_read_exit kernel/rcu/tree_plugin.h:396 [inline]
 __rcu_read_unlock+0x1d/0x70 kernel/rcu/tree_plugin.h:435
 rcu_read_unlock include/linux/rcupdate.h:873 [inline]
 percpu_ref_put_many include/linux/percpu-refcount.h:337 [inline]
 percpu_ref_put include/linux/percpu-refcount.h:351 [inline]
 obj_cgroup_put include/linux/memcontrol.h:772 [inline]
 __memcg_slab_free_hook+0x69/0x1e0 mm/memcontrol.c:3106
 memcg_slab_free_hook mm/slub.c:2214 [inline]
 slab_free mm/slub.c:4643 [inline]
 kfree+0x226/0x320 mm/slub.c:4845
 __io_remove_buffers+0x10b/0x1f0 io_uring/kbuf.c:408
 io_put_bl io_uring/kbuf.c:420 [inline]
 io_destroy_buffers+0xb8/0x150 io_uring/kbuf.c:438
 io_ring_ctx_free+0x82/0x370 io_uring/io_uring.c:2735
 io_ring_exit_work+0x531/0x560 io_uring/io_uring.c:2968
 process_one_work kernel/workqueue.c:3238 [inline]
 process_scheduled_works+0x4de/0xa20 kernel/workqueue.c:3319
 worker_thread+0x52c/0x710 kernel/workqueue.c:3400
 kthread+0x4b7/0x540 kernel/kthread.c:464
 ret_from_fork+0x4b/0x60 arch/x86/kernel/process.c:153
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245

read-write to 0xffff8881010a02b8 of 8 bytes by interrupt on cpu 1:
 wq_worker_tick+0x63/0x240 kernel/workqueue.c:1474
 sched_tick+0x116/0x260 kernel/sched/core.c:5677
 update_process_times+0x161/0x190 kernel/time/timer.c:2520
 tick_sched_handle kernel/time/tick-sched.c:276 [inline]
 tick_nohz_handler+0x250/0x2d0 kernel/time/tick-sched.c:297
 __run_hrtimer kernel/time/hrtimer.c:1761 [inline]
 __hrtimer_run_queues+0x221/0x5f0 kernel/time/hrtimer.c:1825
 hrtimer_interrupt+0x235/0x4a0 kernel/time/hrtimer.c:1887
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1038 [inline]
 __sysvec_apic_timer_interrupt+0x5c/0x1d0 arch/x86/kernel/apic/apic.c:1055
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1049 [inline]
 sysvec_apic_timer_interrupt+0x6e/0x80 arch/x86/kernel/apic/apic.c:1049
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
 refill_obj_stock+0x17a/0x230 arch/x86/include/asm/irqflags.h:-1
 obj_cgroup_uncharge mm/memcontrol.c:3016 [inline]
 __memcg_slab_free_hook+0x103/0x1e0 mm/memcontrol.c:3103
 memcg_slab_free_hook mm/slub.c:2214 [inline]
 slab_free mm/slub.c:4643 [inline]
 kfree+0x226/0x320 mm/slub.c:4845
 __io_remove_buffers+0x10b/0x1f0 io_uring/kbuf.c:408
 io_put_bl io_uring/kbuf.c:420 [inline]
 io_destroy_buffers+0xb8/0x150 io_uring/kbuf.c:438
 io_ring_ctx_free+0x82/0x370 io_uring/io_uring.c:2735
 io_ring_exit_work+0x531/0x560 io_uring/io_uring.c:2968
 process_one_work kernel/workqueue.c:3238 [inline]
 process_scheduled_works+0x4de/0xa20 kernel/workqueue.c:3319
 worker_thread+0x52c/0x710 kernel/workqueue.c:3400
 kthread+0x4b7/0x540 kernel/kthread.c:464
 ret_from_fork+0x4b/0x60 arch/x86/kernel/process.c:153
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245

value changed: 0x0000000000053020 -> 0x0000000000055730

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 UID: 0 PID: 1303 Comm: kworker/u8:5 Not tainted 6.15.0-rc1-syzkaller #0 PREEMPT(voluntary) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
Workqueue: iou_exit io_ring_exit_work
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