=====================================================
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
 do_truncate+0x22a/0x2b0 fs/open.c:65
 handle_truncate fs/namei.c:3395 [inline]
 do_open fs/namei.c:3778 [inline]
 path_openat+0x5c3c/0x6200 fs/namei.c:3933
 do_filp_open+0x20e/0x590 fs/namei.c:3960
 do_sys_openat2+0x1bf/0x2f0 fs/open.c:1415
 do_sys_open fs/open.c:1430 [inline]
 __do_sys_creat fs/open.c:1506 [inline]
 __se_sys_creat fs/open.c:1500 [inline]
 __ia32_sys_creat+0xe4/0x140 fs/open.c:1500
 ia32_sys_call+0x37a3/0x40d0 arch/x86/include/generated/asm/syscalls_32.h:9
 do_syscall_32_irqs_on arch/x86/entry/common.c:165 [inline]
 __do_fast_syscall_32+0xb0/0x110 arch/x86/entry/common.c:386
 do_fast_syscall_32+0x38/0x80 arch/x86/entry/common.c:411
 do_SYSENTER_32+0x1f/0x30 arch/x86/entry/common.c:449
 entry_SYSENTER_compat_after_hwframe+0x84/0x8e

Local variable newattrs created at:
 do_truncate+0x4c/0x2b0 fs/open.c:43
 handle_truncate fs/namei.c:3395 [inline]
 do_open fs/namei.c:3778 [inline]
 path_openat+0x5c3c/0x6200 fs/namei.c:3933

CPU: 1 UID: 0 PID: 6937 Comm: syz.3.556 Not tainted 6.11.0-syzkaller-11993-g3efc57369a0c #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
=====================================================