================================================================== BUG: KCSAN: data-race in kcompactd / kthread_is_per_cpu write to 0xffff888100a0d06c of 4 bytes by task 471 on cpu 1: freezer_do_not_count include/linux/freezer.h:109 [inline] freezable_schedule_timeout include/linux/freezer.h:191 [inline] kcompactd+0x33e/0xc10 mm/compaction.c:2906 kthread+0x1d0/0x1f0 kernel/kthread.c:313 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294 read to 0xffff888100a0d06c of 4 bytes by task 1777 on cpu 0: __to_kthread kernel/kthread.c:101 [inline] kthread_is_per_cpu+0x2d/0x80 kernel/kthread.c:540 can_migrate_task+0xf/0x180 kernel/sched/fair.c:7615 detach_tasks+0xab/0x380 kernel/sched/fair.c:7779 load_balance+0x768/0xcc0 kernel/sched/fair.c:9679 newidle_balance+0x10b/0x310 kernel/sched/fair.c:10643 pick_next_task_fair+0x37/0x270 kernel/sched/fair.c:7203 pick_next_task kernel/sched/core.c:4960 [inline] __schedule+0x256/0x5b0 kernel/sched/core.c:5111 schedule+0x67/0x90 kernel/sched/core.c:5226 freezable_schedule include/linux/freezer.h:172 [inline] do_nanosleep+0x107/0x3d0 kernel/time/hrtimer.c:1896 hrtimer_nanosleep+0xfa/0x1f0 kernel/time/hrtimer.c:1949 common_nsleep+0x69/0x80 kernel/time/posix-timers.c:1227 __do_sys_clock_nanosleep kernel/time/posix-timers.c:1267 [inline] __se_sys_clock_nanosleep kernel/time/posix-timers.c:1245 [inline] __x64_sys_clock_nanosleep+0x1ee/0x220 kernel/time/posix-timers.c:1245 do_syscall_64+0x4a/0x90 arch/x86/entry/common.c:47 entry_SYSCALL_64_after_hwframe+0x44/0xae Reported by Kernel Concurrency Sanitizer on: CPU: 0 PID: 1777 Comm: syz-executor.3 Not tainted 5.13.0-rc2-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================