================================================================== BUG: KCSAN: data-race in wq_worker_tick / wq_worker_tick read-write to 0xffff888101242eb8 of 8 bytes by interrupt on cpu 1: wq_worker_tick+0x60/0x230 kernel/workqueue.c:1478 sched_tick+0x11a/0x270 kernel/sched/core.c:5648 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+0x20f/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 get_current arch/x86/include/asm/current.h:25 [inline] __sanitizer_cov_trace_pc+0x11/0x70 kernel/kcov.c:216 __io_commit_cqring_flush+0xa9/0x100 io_uring/io_uring.c:555 io_commit_cqring_flush io_uring/io_uring.h:422 [inline] io_cq_unlock_post io_uring/io_uring.c:592 [inline] __io_cqring_overflow_flush+0x4e3/0x4f0 io_uring/io_uring.c:645 io_cqring_overflow_kill io_uring/io_uring.c:651 [inline] io_ring_ctx_free+0x68/0x3a0 io_uring/io_uring.c:2791 io_ring_exit_work+0x529/0x560 io_uring/io_uring.c:3030 process_one_work kernel/workqueue.c:3236 [inline] process_scheduled_works+0x4cb/0x9d0 kernel/workqueue.c:3319 worker_thread+0x582/0x770 kernel/workqueue.c:3400 kthread+0x489/0x510 kernel/kthread.c:463 ret_from_fork+0x11f/0x1b0 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 read-write to 0xffff888101242eb8 of 8 bytes by interrupt on cpu 0: wq_worker_tick+0x60/0x230 kernel/workqueue.c:1478 sched_tick+0x11a/0x270 kernel/sched/core.c:5648 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+0x20f/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 io_poll_remove_all+0x70/0x1a0 io_uring/poll.c:740 io_uring_try_cancel_requests+0x275/0x310 io_uring/io_uring.c:3174 io_ring_exit_work+0x195/0x560 io_uring/io_uring.c:2963 process_one_work kernel/workqueue.c:3236 [inline] process_scheduled_works+0x4cb/0x9d0 kernel/workqueue.c:3319 worker_thread+0x582/0x770 kernel/workqueue.c:3400 kthread+0x489/0x510 kernel/kthread.c:463 ret_from_fork+0x11f/0x1b0 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 value changed: 0x00000000000249f0 -> 0x0000000000027100 Reported by Kernel Concurrency Sanitizer on: CPU: 0 UID: 0 PID: 3947 Comm: kworker/u8:49 Tainted: G W syzkaller #0 PREEMPT(voluntary) Tainted: [W]=WARN Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025 Workqueue: iou_exit io_ring_exit_work ==================================================================