syzbot

==================================================================
BUG: KCSAN: data-race in __perf_event_read_value / perf_event_set_state

write to 0xffff88811b2d0e10 of 8 bytes by task 13378 on cpu 0:
 __perf_update_times kernel/events/core.c:-1 [inline]
 perf_event_update_time kernel/events/core.c:735 [inline]
 perf_event_set_state+0x195/0x440 kernel/events/core.c:754
 event_sched_out+0x2d4/0x4d0 kernel/events/core.c:2391
 group_sched_out kernel/events/core.c:2415 [inline]
 __pmu_ctx_sched_out+0x3e7/0x530 kernel/events/core.c:3458
 ctx_sched_out+0x273/0x2d0 kernel/events/core.c:3539
 task_ctx_sched_out+0x4d/0x70 kernel/events/core.c:2859
 perf_event_context_sched_out kernel/events/core.c:3746 [inline]
 __perf_event_task_sched_out+0x286/0x370 kernel/events/core.c:3846
 perf_event_task_sched_out include/linux/perf_event.h:1654 [inline]
 prepare_task_switch kernel/sched/core.c:5045 [inline]
 context_switch kernel/sched/core.c:5201 [inline]
 __schedule+0xbf0/0xcd0 kernel/sched/core.c:6863
 __schedule_loop kernel/sched/core.c:6945 [inline]
 schedule+0x5f/0xd0 kernel/sched/core.c:6960
 futex_do_wait kernel/futex/waitwake.c:358 [inline]
 __futex_wait+0x117/0x260 kernel/futex/waitwake.c:687
 futex_wait+0x9d/0x1d0 kernel/futex/waitwake.c:715
 do_futex+0x2bf/0x380 kernel/futex/syscalls.c:130
 __do_sys_futex kernel/futex/syscalls.c:207 [inline]
 __se_sys_futex+0x2ed/0x360 kernel/futex/syscalls.c:188
 __x64_sys_futex+0x78/0x90 kernel/futex/syscalls.c:188
 x64_sys_call+0x2bc2/0x3000 arch/x86/include/generated/asm/syscalls_64.h:203
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xca/0x2b0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

read to 0xffff88811b2d0e10 of 8 bytes by task 13430 on cpu 1:
 __perf_event_read_value+0x82/0x1d0 kernel/events/core.c:5892
 perf_read_one kernel/events/core.c:6049 [inline]
 __perf_read kernel/events/core.c:6102 [inline]
 perf_read+0x173/0x4d0 kernel/events/core.c:6119
 loop_rw_iter+0x2c6/0x3f0 include/linux/uio.h:-1
 io_iter_do_read io_uring/rw.c:829 [inline]
 __io_read+0xbd5/0xc30 io_uring/rw.c:943
 io_read+0x4a/0x190 io_uring/rw.c:1023
 __io_issue_sqe+0xfe/0x2e0 io_uring/io_uring.c:1793
 io_issue_sqe+0x56/0xa80 io_uring/io_uring.c:1816
 io_wq_submit_work+0x3f7/0x5f0 io_uring/io_uring.c:1928
 io_worker_handle_work+0x44e/0x9b0 io_uring/io-wq.c:650
 io_wq_worker+0x22e/0x860 io_uring/io-wq.c:704
 ret_from_fork+0x149/0x290 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246

value changed: 0x000000003c67c288 -> 0x000000003c67defe

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 UID: 0 PID: 13430 Comm: iou-wrk-13378 Not tainted syzkaller #0 PREEMPT(voluntary) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
==================================================================