syzbot

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BUG: KCSAN: data-race in __d_instantiate / dput

read-write to 0xffff888139d56600 of 4 bytes by task 3883 on cpu 0:
 __d_instantiate+0x2cd/0x3b0 fs/dcache.c:2010
 d_instantiate+0x59/0x80 fs/dcache.c:2035
 shmem_symlink+0x367/0x3a0 mm/shmem.c:3493
 vfs_symlink+0xc2/0x1a0 fs/namei.c:4480
 do_symlinkat+0xe3/0x320 fs/namei.c:4506
 __do_sys_symlink fs/namei.c:4527 [inline]
 __se_sys_symlink fs/namei.c:4525 [inline]
 __x64_sys_symlink+0x56/0x60 fs/namei.c:4525
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

read to 0xffff888139d56600 of 4 bytes by task 3543 on cpu 1:
 fast_dput fs/dcache.c:774 [inline]
 dput+0x35/0x1f0 fs/dcache.c:900
 handle_mounts fs/namei.c:1554 [inline]
 step_into+0x21a/0x800 fs/namei.c:1839
 walk_component+0x164/0x230 fs/namei.c:2007
 lookup_last fs/namei.c:2458 [inline]
 path_lookupat+0x10a/0x2a0 fs/namei.c:2482
 filename_lookup+0x126/0x300 fs/namei.c:2511
 vfs_statx+0xa2/0x430 fs/stat.c:277
 vfs_fstatat+0xcd/0x100 fs/stat.c:332
 __do_sys_newfstatat fs/stat.c:502 [inline]
 __se_sys_newfstatat+0x58/0x260 fs/stat.c:496
 __x64_sys_newfstatat+0x55/0x60 fs/stat.c:496
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

value changed: 0x00000008 -> 0x00600008

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 3543 Comm: udevd Not tainted 6.6.0-rc1-syzkaller-00236-gad8a69f361b9 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/04/2023
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