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BUG: KCSAN: data-race in __d_instantiate / path_openat

write to 0xffff88811b1ee0f0 of 8 bytes by task 15489 on cpu 1:
 __d_set_inode_and_type fs/dcache.c:407 [inline]
 __d_instantiate+0x1db/0x390 fs/dcache.c:1985
 d_make_persistent+0x78/0x110 fs/dcache.c:2803
 shmem_mknod+0x15f/0x170 mm/shmem.c:3907
 shmem_create+0x34/0x50 mm/shmem.c:3959
 lookup_open fs/namei.c:4511 [inline]
 open_last_lookups fs/namei.c:4611 [inline]
 path_openat+0xd75/0x2050 fs/namei.c:4855
 do_file_open+0x16c/0x290 fs/namei.c:4887
 do_sys_openat2+0x94/0x130 fs/open.c:1364
 do_sys_open fs/open.c:1370 [inline]
 __do_sys_openat fs/open.c:1386 [inline]
 __se_sys_openat fs/open.c:1381 [inline]
 __x64_sys_openat+0xf2/0x120 fs/open.c:1381
 x64_sys_call+0x1e39/0x3020 arch/x86/include/generated/asm/syscalls_64.h:258
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x12c/0x3b0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

read to 0xffff88811b1ee0f0 of 8 bytes by task 15492 on cpu 0:
 lookup_fast_for_open fs/namei.c:4554 [inline]
 open_last_lookups fs/namei.c:4582 [inline]
 path_openat+0x464/0x2050 fs/namei.c:4855
 do_file_open+0x16c/0x290 fs/namei.c:4887
 do_sys_openat2+0x94/0x130 fs/open.c:1364
 do_sys_open fs/open.c:1370 [inline]
 __do_sys_openat fs/open.c:1386 [inline]
 __se_sys_openat fs/open.c:1381 [inline]
 __x64_sys_openat+0xf2/0x120 fs/open.c:1381
 x64_sys_call+0x1e39/0x3020 arch/x86/include/generated/asm/syscalls_64.h:258
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x12c/0x3b0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

value changed: 0x0000000000000000 -> 0xffff88812f5eefc0

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 UID: 0 PID: 15492 Comm: syz.6.2819 Tainted: G        W           syzkaller #0 PREEMPT(full) 
Tainted: [W]=WARN
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026
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