=====================================================
BUG: KMSAN: uninit-value in map_id_up_base kernel/user_namespace.c:355 [inline]
BUG: KMSAN: uninit-value in map_id_up kernel/user_namespace.c:385 [inline]
BUG: KMSAN: uninit-value in from_kuid+0x41e/0x990 kernel/user_namespace.c:433
 map_id_up_base kernel/user_namespace.c:355 [inline]
 map_id_up kernel/user_namespace.c:385 [inline]
 from_kuid+0x41e/0x990 kernel/user_namespace.c:433
 ocfs2_setattr+0x254/0x3140 fs/ocfs2/file.c:1133
 notify_change+0x1a8e/0x1b80 fs/attr.c:503
 chmod_common+0x3b8/0x630 fs/open.c:653
 vfs_fchmod fs/open.c:669 [inline]
 __do_sys_fchmod fs/open.c:678 [inline]
 __se_sys_fchmod fs/open.c:672 [inline]
 __x64_sys_fchmod+0x1fb/0x320 fs/open.c:672
 x64_sys_call+0x7a0/0x3ba0 arch/x86/include/generated/asm/syscalls_64.h:92
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcd/0x1e0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Local variable newattrs created at:
 chmod_common+0xac/0x630 fs/open.c:640
 vfs_fchmod fs/open.c:669 [inline]
 __do_sys_fchmod fs/open.c:678 [inline]
 __se_sys_fchmod fs/open.c:672 [inline]
 __x64_sys_fchmod+0x1fb/0x320 fs/open.c:672

CPU: 0 UID: 0 PID: 4768 Comm: syz.1.2796 Tainted: G        W          6.11.0-syzkaller-11993-g3efc57369a0c #0
Tainted: [W]=WARN
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
=====================================================