================================================================== BUG: KCSAN: data-race in __mod_timer / timer_clear_idle write to 0xffff88812c01cb24 of 1 bytes by task 0 on cpu 0: timer_clear_idle+0x2e/0x40 kernel/time/timer.c:1675 tick_nohz_idle_retain_tick+0x3e/0x40 kernel/time/tick-sched.c:1004 cpuidle_idle_call kernel/sched/idle.c:210 [inline] do_idle+0x287/0x310 kernel/sched/idle.c:276 cpu_startup_entry+0x15/0x20 kernel/sched/idle.c:372 rest_init+0xd8/0xe0 init/main.c:705 arch_call_rest_init+0xa/0xb start_kernel+0x608/0x6d0 init/main.c:1043 secondary_startup_64+0xa4/0xb0 arch/x86/kernel/head_64.S:243 read to 0xffff88812c01cb24 of 1 bytes by task 21 on cpu 1: forward_timer_base kernel/time/timer.c:891 [inline] __mod_timer+0xa24/0xf00 kernel/time/timer.c:1009 add_timer+0x38/0x50 kernel/time/timer.c:1136 __queue_delayed_work+0xea/0x150 kernel/workqueue.c:1649 queue_delayed_work_on+0x8d/0xe0 kernel/workqueue.c:1674 queue_delayed_work include/linux/workqueue.h:522 [inline] batadv_nc_start_timer net/batman-adv/network-coding.c:79 [inline] batadv_nc_worker+0x9f1/0xa00 net/batman-adv/network-coding.c:740 process_one_work+0x3e1/0x9a0 kernel/workqueue.c:2269 worker_thread+0x665/0xbe0 kernel/workqueue.c:2415 kthread+0x20d/0x230 kernel/kthread.c:291 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:293 Reported by Kernel Concurrency Sanitizer on: CPU: 1 PID: 21 Comm: kworker/u4:1 Not tainted 5.8.0-rc3-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: bat_events batadv_nc_worker ==================================================================