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BUG: KCSAN: data-race in __d_instantiate / step_into

write to 0xffff888106bf4ab0 of 8 bytes by task 18915 on cpu 0:
 __d_set_inode_and_type fs/dcache.c:406 [inline]
 __d_instantiate+0x1f8/0x3b0 fs/dcache.c:1920
 d_instantiate+0x59/0x80 fs/dcache.c:1947
 shmem_symlink+0x3a7/0x3d0 mm/shmem.c:4135
 vfs_symlink+0xd1/0x1e0 fs/namei.c:4739
 do_symlinkat+0xc7/0x3c0 fs/namei.c:4765
 __do_sys_symlinkat fs/namei.c:4781 [inline]
 __se_sys_symlinkat fs/namei.c:4778 [inline]
 __x64_sys_symlinkat+0x5a/0x70 fs/namei.c:4778
 x64_sys_call+0x1558/0x2fb0 arch/x86/include/generated/asm/syscalls_64.h:267
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xd2/0x200 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

read to 0xffff888106bf4ab0 of 8 bytes by task 18907 on cpu 1:
 step_into+0x122/0x820 fs/namei.c:1980
 open_last_lookups fs/namei.c:3843 [inline]
 path_openat+0x13e8/0x2170 fs/namei.c:4052
 do_filp_open+0x109/0x230 fs/namei.c:4082
 io_openat2+0x272/0x390 io_uring/openclose.c:142
 io_openat+0x1b/0x30 io_uring/openclose.c:179
 __io_issue_sqe+0xfe/0x2e0 io_uring/io_uring.c:1738
 io_issue_sqe+0x53/0x970 io_uring/io_uring.c:1761
 io_queue_sqe io_uring/io_uring.c:1968 [inline]
 io_submit_sqe io_uring/io_uring.c:2224 [inline]
 io_submit_sqes+0x667/0xfd0 io_uring/io_uring.c:2337
 __do_sys_io_uring_enter io_uring/io_uring.c:3404 [inline]
 __se_sys_io_uring_enter+0x1c1/0x1b70 io_uring/io_uring.c:3338
 __x64_sys_io_uring_enter+0x78/0x90 io_uring/io_uring.c:3338
 x64_sys_call+0x28c8/0x2fb0 arch/x86/include/generated/asm/syscalls_64.h:427
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xd2/0x200 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

value changed: 0x0000000000000000 -> 0xffff888103f314d8

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 UID: 0 PID: 18907 Comm: syz.2.5154 Not tainted 6.16.0-rc2-syzkaller-00231-g75f5f23f8787 #0 PREEMPT(voluntary) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
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