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BUG: KCSAN: data-race in d_alloc_parallel / d_set_d_op

write to 0xffff88812b81e840 of 4 bytes by task 19734 on cpu 0:
 d_set_d_op+0x104/0x210 fs/dcache.c:1852
 proc_pid_instantiate+0xcf/0x100 fs/proc/base.c:3335
 proc_fill_cache+0x1e5/0x280 fs/proc/base.c:1991
 proc_pid_readdir+0x1c4/0x423 fs/proc/base.c:3446
 proc_root_readdir+0x88/0xa0 fs/proc/root.c:258
 iterate_dir+0x2fa/0x370 fs/readdir.c:65
 __do_sys_getdents fs/readdir.c:285 [inline]
 __se_sys_getdents fs/readdir.c:267 [inline]
 __x64_sys_getdents+0x14b/0x2b0 fs/readdir.c:267
 do_syscall_64+0xc7/0x390 arch/x86/entry/common.c:294
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

read to 0xffff88812b81e840 of 4 bytes by task 19737 on cpu 1:
 d_wait_lookup fs/dcache.c:2502 [inline]
 d_alloc_parallel+0x873/0xdf0 fs/dcache.c:2590
 proc_fill_cache+0x189/0x280 fs/proc/base.c:1986
 proc_pid_readdir+0x1c4/0x423 fs/proc/base.c:3446
 proc_root_readdir+0x88/0xa0 fs/proc/root.c:258
 iterate_dir+0x2fa/0x370 fs/readdir.c:65
 __do_sys_getdents fs/readdir.c:285 [inline]
 __se_sys_getdents fs/readdir.c:267 [inline]
 __x64_sys_getdents+0x14b/0x2b0 fs/readdir.c:267
 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: 1 PID: 19737 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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