syzbot

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BUG: KCSAN: data-race in clockevents_program_event / print_tickdevice

write to 0xffff888237c1bf18 of 8 bytes by task 16024 on cpu 0:
 clockevents_program_event+0x34/0x1d0 kernel/time/clockevents.c:313
 tick_program_event+0x7c/0xc0 kernel/time/tick-oneshot.c:44
 __hrtimer_reprogram kernel/time/hrtimer.c:681 [inline]
 hrtimer_force_reprogram kernel/time/hrtimer.c:699 [inline]
 __remove_hrtimer kernel/time/hrtimer.c:1128 [inline]
 remove_hrtimer+0x1e2/0x2d0 kernel/time/hrtimer.c:1165
 hrtimer_try_to_cancel+0x18c/0x1d0 kernel/time/hrtimer.c:1334
 hrtimer_cancel+0x16/0x50 kernel/time/hrtimer.c:1443
 perf_swevent_cancel_hrtimer kernel/events/core.c:11025 [inline]
 cpu_clock_event_stop kernel/events/core.c:11076 [inline]
 cpu_clock_event_del+0x67/0x90 kernel/events/core.c:11091
 event_sched_out+0x1a6/0x5d0 kernel/events/core.c:2239
 group_sched_out kernel/events/core.c:2285 [inline]
 __pmu_ctx_sched_out+0x384/0x4a0 kernel/events/core.c:3230
 ctx_sched_out+0x23f/0x290 kernel/events/core.c:3294
 task_ctx_sched_out kernel/events/core.c:2631 [inline]
 perf_event_context_sched_out kernel/events/core.c:3533 [inline]
 __perf_event_task_sched_out+0x3f4/0xe50 kernel/events/core.c:3632
 perf_event_task_sched_out include/linux/perf_event.h:1454 [inline]
 prepare_task_switch kernel/sched/core.c:5145 [inline]
 context_switch kernel/sched/core.c:5288 [inline]
 __schedule+0x8ab/0x8b0 kernel/sched/core.c:6669
 schedule+0x51/0x80 kernel/sched/core.c:6745
 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 0xffff888237c1bf18 of 8 bytes by task 16034 on cpu 1:
 print_tickdevice+0x144/0x340 kernel/time/timer_list.c:204
 timer_list_show+0x79/0x180 kernel/time/timer_list.c:296
 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:1862 [inline]
 generic_file_splice_read+0xe3/0x290 fs/splice.c:419
 do_splice_to fs/splice.c:902 [inline]
 splice_direct_to_actor+0x25a/0x5f0 fs/splice.c:973
 do_splice_direct+0x104/0x180 fs/splice.c:1082
 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: 0x0000014f6899bd79 -> 0x0000014f689afd6e

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 16034 Comm: syz-executor.2 Not tainted 6.4.0-rc6-syzkaller-00049-g62d8779610bb #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/27/2023
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