KCSAN: data-race in attach_to_pi_owner / do

Kernel	Title	Repro	Cause bisect	Fix bisect	Count	Last	Reported	Patched	Status
upstream	KCSAN: data-race in attach_to_pi_owner / do_nanosleep (3) kernel				3	1070d	1104d	0/26	auto-closed as invalid on 2021/06/24 12:20
upstream	KCSAN: data-race in attach_to_pi_owner / do_nanosleep kernel				1	1468d	1468d	0/26	auto-closed as invalid on 2020/06/18 14:14

================================================================== BUG: KCSAN: data-race in attach_to_pi_owner / do_nanosleep read-write to 0xffff88810941902c of 4 bytes by task 8451 on cpu 0: freezer_count include/linux/freezer.h:121 [inline] freezable_schedule include/linux/freezer.h:173 [inline] do_nanosleep+0x111/0x3c0 kernel/time/hrtimer.c:1878 hrtimer_nanosleep kernel/time/hrtimer.c:1931 [inline] __do_sys_nanosleep kernel/time/hrtimer.c:1965 [inline] __se_sys_nanosleep+0x20b/0x2a0 kernel/time/hrtimer.c:1952 __x64_sys_nanosleep+0x2d/0x40 kernel/time/hrtimer.c:1952 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 read to 0xffff88810941902c of 4 bytes by task 15666 on cpu 1: attach_to_pi_owner+0x64/0x480 kernel/futex.c:1215 futex_lock_pi_atomic+0x338/0x4f0 kernel/futex.c:1420 futex_lock_pi+0x2bf/0x880 kernel/futex.c:2797 do_futex+0x1fc/0x20c0 kernel/futex.c:3776 __do_sys_futex kernel/futex.c:3826 [inline] __se_sys_futex+0x2a8/0x390 kernel/futex.c:3792 __x64_sys_futex+0x74/0x80 kernel/futex.c:3792 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 Reported by Kernel Concurrency Sanitizer on: CPU: 1 PID: 15666 Comm: syz-executor.4 Not tainted 5.11.0-rc5-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================