================================================================== BUG: KCSAN: data-race in hrtimer_reprogram / print_cpu write to 0xffff888237c1ed60 of 8 bytes by task 8232 on cpu 0: __hrtimer_reprogram kernel/time/hrtimer.c:659 [inline] hrtimer_reprogram+0x1bd/0x230 kernel/time/hrtimer.c:866 hrtimer_start_range_ns+0x4e8/0x660 kernel/time/hrtimer.c:1299 hrtimer_start include/linux/hrtimer.h:418 [inline] perf_swevent_start_hrtimer kernel/events/core.c:11001 [inline] cpu_clock_event_start kernel/events/core.c:11059 [inline] cpu_clock_event_add+0x10e/0x130 kernel/events/core.c:11071 event_sched_in+0x451/0x670 kernel/events/core.c:2514 group_sched_in kernel/events/core.c:2546 [inline] merge_sched_in kernel/events/core.c:3799 [inline] visit_groups_merge+0xbe0/0x1b90 kernel/events/core.c:3744 ctx_flexible_sched_in+0xa0/0xf0 kernel/events/core.c:3852 ctx_sched_in+0x1b0/0x1c0 kernel/events/core.c:3905 perf_event_sched_in kernel/events/core.c:2642 [inline] perf_event_context_sched_in kernel/events/core.c:3951 [inline] __perf_event_task_sched_in+0x470/0x790 kernel/events/core.c:3980 perf_event_task_sched_in include/linux/perf_event.h:1431 [inline] finish_task_switch+0x1ea/0x280 kernel/sched/core.c:5181 context_switch kernel/sched/core.c:5310 [inline] __schedule+0x656/0x8e0 kernel/sched/core.c:6625 schedule+0x51/0x80 kernel/sched/core.c:6701 exit_to_user_mode_loop+0x49/0xe0 kernel/entry/common.c:159 exit_to_user_mode_prepare+0x6c/0xb0 kernel/entry/common.c:204 __syscall_exit_to_user_mode_work kernel/entry/common.c:286 [inline] syscall_exit_to_user_mode+0x26/0x140 kernel/entry/common.c:297 do_syscall_64+0x4d/0xc0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x63/0xcd read to 0xffff888237c1ed60 of 8 bytes by task 8225 on cpu 1: print_cpu+0x2fb/0x630 kernel/time/timer_list.c:133 timer_list_show+0x115/0x180 kernel/time/timer_list.c:291 seq_read_iter+0x612/0x8f0 fs/seq_file.c:272 proc_reg_read_iter+0x10e/0x180 fs/proc/inode.c:305 call_read_iter include/linux/fs.h:1845 [inline] generic_file_splice_read+0xe3/0x290 fs/splice.c:403 do_splice_to fs/splice.c:886 [inline] splice_direct_to_actor+0x25a/0x5f0 fs/splice.c:957 do_splice_direct+0x104/0x180 fs/splice.c:1066 do_sendfile+0x3b8/0x950 fs/read_write.c:1254 __do_sys_sendfile64 fs/read_write.c:1322 [inline] __se_sys_sendfile64 fs/read_write.c:1308 [inline] __x64_sys_sendfile64+0x110/0x150 fs/read_write.c:1308 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd value changed: 0x0000006029cd9ca5 -> 0x7fffffffffffffff Reported by Kernel Concurrency Sanitizer on: CPU: 1 PID: 8225 Comm: syz-executor.3 Not tainted 6.3.0-syzkaller-00436-g173ea743bf7a #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/14/2023 ==================================================================