=====================================================
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 fs/open.c:65 [inline]
 do_ftruncate+0x8c1/0xbf0 fs/open.c:181
 do_sys_ftruncate fs/open.c:199 [inline]
 __do_compat_sys_ftruncate fs/open.c:213 [inline]
 __se_compat_sys_ftruncate fs/open.c:211 [inline]
 __ia32_compat_sys_ftruncate+0x157/0x290 fs/open.c:211
 ia32_sys_call+0x2482/0x40d0 arch/x86/include/generated/asm/syscalls_32.h:94
 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.i created at:
 do_truncate fs/open.c:43 [inline]
 do_ftruncate+0x600/0xbf0 fs/open.c:181
 do_sys_ftruncate fs/open.c:199 [inline]
 __do_compat_sys_ftruncate fs/open.c:213 [inline]
 __se_compat_sys_ftruncate fs/open.c:211 [inline]
 __ia32_compat_sys_ftruncate+0x157/0x290 fs/open.c:211

CPU: 0 UID: 0 PID: 6262 Comm: syz.4.265 Not tainted 6.12.0-rc3-syzkaller-00420-g715ca9dd687f #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
=====================================================