=====================================================
BUG: KMSAN: uninit-value in map_id_range_up_base kernel/user_namespace.c:360 [inline]
BUG: KMSAN: uninit-value in map_id_range_up kernel/user_namespace.c:391 [inline]
BUG: KMSAN: uninit-value in map_id_up kernel/user_namespace.c:406 [inline]
BUG: KMSAN: uninit-value in from_kgid kernel/user_namespace.c:512 [inline]
BUG: KMSAN: uninit-value in from_kgid_munged+0x582/0xc40 kernel/user_namespace.c:536
 map_id_range_up_base kernel/user_namespace.c:360 [inline]
 map_id_range_up kernel/user_namespace.c:391 [inline]
 map_id_up kernel/user_namespace.c:406 [inline]
 from_kgid kernel/user_namespace.c:512 [inline]
 from_kgid_munged+0x582/0xc40 kernel/user_namespace.c:536
 task_state fs/proc/array.c:202 [inline]
 proc_pid_status+0xd96/0x3a20 fs/proc/array.c:447
 proc_single_show+0x164/0x360 fs/proc/base.c:812
 seq_read_iter+0xaaa/0x2300 fs/seq_file.c:231
 seq_read+0x591/0x670 fs/seq_file.c:163
 vfs_read+0x27c/0xf90 fs/read_write.c:572
 ksys_read+0x1d9/0x470 fs/read_write.c:717
 __do_sys_read fs/read_write.c:726 [inline]
 __se_sys_read fs/read_write.c:724 [inline]
 __ia32_sys_read+0x9a/0xf0 fs/read_write.c:724
 ia32_sys_call+0x1914/0x4360 arch/x86/include/generated/asm/syscalls_32.h:4
 do_syscall_32_irqs_on arch/x86/entry/syscall_32.c:83 [inline]
 __do_fast_syscall_32+0x17f/0x3f0 arch/x86/entry/syscall_32.c:307
 do_fast_syscall_32+0x37/0x80 arch/x86/entry/syscall_32.c:332
 do_SYSENTER_32+0x1f/0x30 arch/x86/entry/syscall_32.c:370
 entry_SYSENTER_compat_after_hwframe+0x84/0x8e

Uninit was created at:
 slab_post_alloc_hook mm/slub.c:4545 [inline]
 slab_alloc_node mm/slub.c:4866 [inline]
 __do_kmalloc_node mm/slub.c:5259 [inline]
 __kvmalloc_node_noprof+0x5ad/0x18d0 mm/slub.c:6752
 groups_alloc kernel/groups.c:18 [inline]
 __do_sys_setgroups kernel/groups.c:208 [inline]
 __se_sys_setgroups+0x142/0x7d0 kernel/groups.c:198
 __x64_sys_setgroups+0x78/0xb0 kernel/groups.c:198
 x64_sys_call+0x37d4/0x3ea0 arch/x86/include/generated/asm/syscalls_64.h:117
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x134/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

CPU: 1 UID: 0 PID: 6481 Comm: syz.4.227 Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026
=====================================================