================================================================== BUG: KCSAN: data-race in wq_worker_tick / wq_worker_tick read-write to 0xffff8881001e3cb8 of 8 bytes by interrupt on cpu 0: wq_worker_tick+0x60/0x230 kernel/workqueue.c:1474 sched_tick+0x11a/0x270 kernel/sched/core.c:5692 update_process_times+0x15f/0x190 kernel/time/timer.c:2478 tick_sched_handle kernel/time/tick-sched.c:276 [inline] tick_nohz_handler+0x249/0x2d0 kernel/time/tick-sched.c:297 __run_hrtimer kernel/time/hrtimer.c:1761 [inline] __hrtimer_run_queues+0x20c/0x5a0 kernel/time/hrtimer.c:1825 hrtimer_interrupt+0x21a/0x460 kernel/time/hrtimer.c:1887 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1039 [inline] __sysvec_apic_timer_interrupt+0x5c/0x1d0 arch/x86/kernel/apic/apic.c:1056 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1050 [inline] sysvec_apic_timer_interrupt+0x6f/0x80 arch/x86/kernel/apic/apic.c:1050 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702 static_key_slow_dec+0x0/0x70 kernel/jump_label.c:330 io_ring_ctx_free+0x22f/0x390 io_uring/io_uring.c:2812 io_ring_exit_work+0x529/0x560 io_uring/io_uring.c:3031 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+0x489/0x510 kernel/kthread.c:464 ret_from_fork+0xdd/0x150 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 read-write to 0xffff8881001e3cb8 of 8 bytes by interrupt on cpu 1: wq_worker_tick+0x60/0x230 kernel/workqueue.c:1474 sched_tick+0x11a/0x270 kernel/sched/core.c:5692 update_process_times+0x15f/0x190 kernel/time/timer.c:2478 tick_sched_handle kernel/time/tick-sched.c:276 [inline] tick_nohz_handler+0x249/0x2d0 kernel/time/tick-sched.c:297 __run_hrtimer kernel/time/hrtimer.c:1761 [inline] __hrtimer_run_queues+0x20c/0x5a0 kernel/time/hrtimer.c:1825 hrtimer_interrupt+0x21a/0x460 kernel/time/hrtimer.c:1887 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1039 [inline] __sysvec_apic_timer_interrupt+0x5c/0x1d0 arch/x86/kernel/apic/apic.c:1056 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1050 [inline] sysvec_apic_timer_interrupt+0x6f/0x80 arch/x86/kernel/apic/apic.c:1050 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702 bpf_trace_run2+0x43/0x1c0 kernel/trace/bpf_trace.c:2299 __do_trace_kfree include/trace/events/kmem.h:94 [inline] trace_kfree include/trace/events/kmem.h:94 [inline] kfree+0x27b/0x320 mm/slub.c:4829 io_alloc_cache_free+0xc0/0xe0 io_uring/alloc_cache.c:16 io_futex_cache_free+0x23/0x30 io_uring/futex.c:41 io_free_alloc_caches+0x70/0x80 io_uring/io_uring.c:294 io_ring_ctx_free+0x78/0x390 io_uring/io_uring.c:2794 io_ring_exit_work+0x529/0x560 io_uring/io_uring.c:3031 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+0x489/0x510 kernel/kthread.c:464 ret_from_fork+0xdd/0x150 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 value changed: 0x000000000002e630 -> 0x0000000000030d40 Reported by Kernel Concurrency Sanitizer on: CPU: 1 UID: 0 PID: 3319 Comm: kworker/u8:6 Not tainted 6.16.0-syzkaller-01056-gae388edd4a8f #0 PREEMPT(voluntary) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 Workqueue: iou_exit io_ring_exit_work ==================================================================