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BUG: KCSAN: data-race in do_nanosleep / task_dump_owner

write to 0xffff88810086e0a4 of 4 bytes by task 7750 on cpu 1:
 freezer_count include/linux/freezer.h:121 [inline]
 freezable_schedule include/linux/freezer.h:173 [inline]
 do_nanosleep+0x14d/0x320 kernel/time/hrtimer.c:1874
 hrtimer_nanosleep+0x136/0x230 kernel/time/hrtimer.c:1927
 __do_sys_nanosleep kernel/time/hrtimer.c:1961 [inline]
 __se_sys_nanosleep kernel/time/hrtimer.c:1948 [inline]
 __x64_sys_nanosleep+0x14b/0x190 kernel/time/hrtimer.c:1948
 do_syscall_64+0xc7/0x390 arch/x86/entry/common.c:294
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

read to 0xffff88810086e0a4 of 4 bytes by task 8583 on cpu 0:
 task_dump_owner+0x42/0x250 fs/proc/base.c:1789
 pid_update_inode+0x35/0x70 fs/proc/base.c:1909
 pid_revalidate+0x89/0x110 fs/proc/base.c:1932
 d_revalidate fs/namei.c:766 [inline]
 d_revalidate fs/namei.c:763 [inline]
 lookup_fast+0x6d5/0x6e0 fs/namei.c:1707
 walk_component+0x73/0x9a0 fs/namei.c:1911
 lookup_last fs/namei.c:2391 [inline]
 path_lookupat.isra.0+0x129/0x2e0 fs/namei.c:2436
 filename_lookup+0x145/0x2b0 fs/namei.c:2466
 user_path_at_empty+0x47/0x60 fs/namei.c:2746
 user_path_at include/linux/namei.h:58 [inline]
 vfs_statx+0xdb/0x190 fs/stat.c:197
 vfs_stat include/linux/fs.h:3271 [inline]
 __do_sys_newstat+0x50/0xb0 fs/stat.c:351
 __se_sys_newstat fs/stat.c:347 [inline]
 __x64_sys_newstat+0x37/0x50 fs/stat.c:347
 do_syscall_64+0xc7/0x390 arch/x86/entry/common.c:294
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 8583 Comm: ps Not tainted 5.6.0-rc1-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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