===================================================== BUG: KMSAN: uninit-value in copy_from_kernel_nofault+0x15f/0x570 mm/maccess.c:41 copy_from_kernel_nofault+0x15f/0x570 mm/maccess.c:41 prepend_copy fs/d_path.c:50 [inline] prepend fs/d_path.c:76 [inline] prepend_name fs/d_path.c:101 [inline] __prepend_path fs/d_path.c:133 [inline] prepend_path+0x64e/0x1080 fs/d_path.c:172 d_absolute_path+0x11b/0x240 fs/d_path.c:234 tomoyo_get_absolute_path security/tomoyo/realpath.c:101 [inline] tomoyo_realpath_from_path+0x4c0/0x9f0 security/tomoyo/realpath.c:271 tomoyo_get_realpath security/tomoyo/file.c:151 [inline] tomoyo_path_perm+0x249/0x9a0 security/tomoyo/file.c:827 tomoyo_inode_getattr+0x35/0x40 security/tomoyo/tomoyo.c:123 security_inode_getattr+0x167/0x590 security/security.c:1895 vfs_getattr fs/stat.c:259 [inline] vfs_fstat fs/stat.c:281 [inline] __do_sys_newfstat fs/stat.c:551 [inline] __se_sys_newfstat+0xd5/0xa60 fs/stat.c:546 __x64_sys_newfstat+0x78/0xb0 fs/stat.c:546 x64_sys_call+0x2f28/0x3ea0 arch/x86/include/generated/asm/syscalls_64.h:6 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x15d/0x3c0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f Uninit was stored to memory at: copy_name fs/dcache.c:3031 [inline] __d_move+0xd29/0x21f0 fs/dcache.c:3099 d_move+0x71/0xf0 fs/dcache.c:3147 vfs_rename+0x2619/0x2770 fs/namei.c:6089 filename_renameat2+0xa59/0x1230 fs/namei.c:6192 __do_sys_rename fs/namei.c:6236 [inline] __se_sys_rename+0xc5/0x5c0 fs/namei.c:6232 __x64_sys_rename+0x78/0xb0 fs/namei.c:6232 x64_sys_call+0x329/0x3ea0 arch/x86/include/generated/asm/syscalls_64.h:83 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x15d/0x3c0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f Uninit was stored to memory at: copy_name fs/dcache.c:3031 [inline] __d_move+0xd29/0x21f0 fs/dcache.c:3099 d_move+0x71/0xf0 fs/dcache.c:3147 vfs_rename+0x2619/0x2770 fs/namei.c:6089 filename_renameat2+0xa59/0x1230 fs/namei.c:6192 __do_sys_rename fs/namei.c:6236 [inline] __se_sys_rename+0xc5/0x5c0 fs/namei.c:6232 __x64_sys_rename+0x78/0xb0 fs/namei.c:6232 x64_sys_call+0x329/0x3ea0 arch/x86/include/generated/asm/syscalls_64.h:83 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x15d/0x3c0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f Uninit was stored to memory at: copy_name fs/dcache.c:3031 [inline] __d_move+0xd29/0x21f0 fs/dcache.c:3099 d_move+0x71/0xf0 fs/dcache.c:3147 vfs_rename+0x2619/0x2770 fs/namei.c:6089 filename_renameat2+0xa59/0x1230 fs/namei.c:6192 __do_sys_rename fs/namei.c:6236 [inline] __se_sys_rename+0xc5/0x5c0 fs/namei.c:6232 __x64_sys_rename+0x78/0xb0 fs/namei.c:6232 x64_sys_call+0x329/0x3ea0 arch/x86/include/generated/asm/syscalls_64.h:83 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x15d/0x3c0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f Uninit was stored to memory at: copy_name fs/dcache.c:3031 [inline] __d_move+0xd29/0x21f0 fs/dcache.c:3099 d_move+0x71/0xf0 fs/dcache.c:3147 vfs_rename+0x2619/0x2770 fs/namei.c:6089 filename_renameat2+0xa59/0x1230 fs/namei.c:6192 __do_sys_rename fs/namei.c:6236 [inline] __se_sys_rename+0xc5/0x5c0 fs/namei.c:6232 __x64_sys_rename+0x78/0xb0 fs/namei.c:6232 x64_sys_call+0x329/0x3ea0 arch/x86/include/generated/asm/syscalls_64.h:83 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x15d/0x3c0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f Uninit was stored to memory at: copy_name fs/dcache.c:3031 [inline] __d_move+0xd29/0x21f0 fs/dcache.c:3099 d_move+0x71/0xf0 fs/dcache.c:3147 vfs_rename+0x2619/0x2770 fs/namei.c:6089 filename_renameat2+0xa59/0x1230 fs/namei.c:6192 __do_sys_rename fs/namei.c:6236 [inline] __se_sys_rename+0xc5/0x5c0 fs/namei.c:6232 __x64_sys_rename+0x78/0xb0 fs/namei.c:6232 x64_sys_call+0x329/0x3ea0 arch/x86/include/generated/asm/syscalls_64.h:83 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x15d/0x3c0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f Uninit was stored to memory at: copy_name fs/dcache.c:3031 [inline] __d_move+0xd29/0x21f0 fs/dcache.c:3099 d_move+0x71/0xf0 fs/dcache.c:3147 vfs_rename+0x2619/0x2770 fs/namei.c:6089 filename_renameat2+0xa59/0x1230 fs/namei.c:6192 __do_sys_rename fs/namei.c:6236 [inline] __se_sys_rename+0xc5/0x5c0 fs/namei.c:6232 __x64_sys_rename+0x78/0xb0 fs/namei.c:6232 x64_sys_call+0x329/0x3ea0 arch/x86/include/generated/asm/syscalls_64.h:83 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x15d/0x3c0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f Uninit was stored to memory at: copy_name fs/dcache.c:3031 [inline] __d_move+0xd29/0x21f0 fs/dcache.c:3099 d_move+0x71/0xf0 fs/dcache.c:3147 vfs_rename+0x2619/0x2770 fs/namei.c:6089 filename_renameat2+0xa59/0x1230 fs/namei.c:6192 __do_sys_rename fs/namei.c:6236 [inline] __se_sys_rename+0xc5/0x5c0 fs/namei.c:6232 __x64_sys_rename+0x78/0xb0 fs/namei.c:6232 x64_sys_call+0x329/0x3ea0 arch/x86/include/generated/asm/syscalls_64.h:83 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x15d/0x3c0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f Uninit was created at: slab_post_alloc_hook mm/slub.c:4599 [inline] slab_alloc_node mm/slub.c:4917 [inline] kmem_cache_alloc_lru_noprof+0x5fe/0x1120 mm/slub.c:4950 __d_alloc+0x52/0x9f0 fs/dcache.c:1902 d_alloc+0x57/0x300 fs/dcache.c:1981 lookup_one_qstr_excl+0x19d/0x7a0 fs/namei.c:1806 __start_renaming+0x341/0x850 fs/namei.c:3888 filename_renameat2+0x625/0x1230 fs/namei.c:6167 __do_sys_rename fs/namei.c:6236 [inline] __se_sys_rename+0xc5/0x5c0 fs/namei.c:6232 __x64_sys_rename+0x78/0xb0 fs/namei.c:6232 x64_sys_call+0x329/0x3ea0 arch/x86/include/generated/asm/syscalls_64.h:83 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x15d/0x3c0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f Bytes 5-7 of 8 are uninitialized Memory access of size 8 starts at ffff88801478f938 CPU: 0 UID: 0 PID: 5838 Comm: udevd Tainted: G W syzkaller #0 PREEMPT(lazy) Tainted: [W]=WARN Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026 =====================================================