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BUG: KCSAN: data-race in __dentry_kill / d_set_d_op

write to 0xffff888143a46d80 of 4 bytes by task 1793 on cpu 0:
 d_set_d_op+0x17f/0x220 fs/dcache.c:1910
 simple_lookup+0x78/0x90 fs/libfs.c:74
 lookup_open fs/namei.c:3227 [inline]
 open_last_lookups fs/namei.c:3319 [inline]
 path_openat+0xb63/0x1e90 fs/namei.c:3525
 do_filp_open+0xe9/0x200 fs/namei.c:3555
 do_sys_openat2+0xa3/0x290 fs/open.c:1200
 do_sys_open fs/open.c:1216 [inline]
 __do_sys_openat fs/open.c:1232 [inline]
 __se_sys_openat fs/open.c:1227 [inline]
 __x64_sys_openat+0xef/0x110 fs/open.c:1227
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x3d/0x90 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

read to 0xffff888143a46d80 of 4 bytes by task 1791 on cpu 1:
 dentry_unlist fs/dcache.c:547 [inline]
 __dentry_kill+0x1ef/0x4e0 fs/dcache.c:578
 dentry_kill fs/dcache.c:695 [inline]
 dput+0xc6/0x360 fs/dcache.c:888
 handle_mounts fs/namei.c:1502 [inline]
 step_into+0x463/0xee0 fs/namei.c:1800
 open_last_lookups fs/namei.c:3342 [inline]
 path_openat+0x101c/0x1e90 fs/namei.c:3525
 do_filp_open+0xe9/0x200 fs/namei.c:3555
 do_sys_openat2+0xa3/0x290 fs/open.c:1200
 do_sys_open fs/open.c:1216 [inline]
 __do_sys_openat fs/open.c:1232 [inline]
 __se_sys_openat fs/open.c:1227 [inline]
 __x64_sys_openat+0xef/0x110 fs/open.c:1227
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x3d/0x90 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

value changed: 0x10000000 -> 0x00000008

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 1791 Comm: syz-executor.1 Not tainted 5.14.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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