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BUG: KCSAN: data-race in copy_creds / prepare_creds

write to 0xffff8881446d52e8 of 4 bytes by task 30552 on cpu 1:
 get_cred_many include/linux/cred.h:202 [inline]
 copy_creds+0x78/0x3f0 kernel/cred.c:305
 copy_process+0x658/0x2000 kernel/fork.c:2038
 kernel_clone+0x16c/0x5c0 kernel/fork.c:2605
 __do_sys_clone3 kernel/fork.c:2909 [inline]
 __se_sys_clone3+0x1c2/0x200 kernel/fork.c:2888
 __x64_sys_clone3+0x31/0x40 kernel/fork.c:2888
 x64_sys_call+0x1fc9/0x2ff0 arch/x86/include/generated/asm/syscalls_64.h:436
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xd2/0x200 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

read to 0xffff8881446d5240 of 184 bytes by task 30554 on cpu 0:
 prepare_creds+0x6c/0x4c0 kernel/cred.c:219
 install_thread_keyring security/keys/process_keys.c:249 [inline]
 lookup_user_key+0x12a/0xd10 security/keys/process_keys.c:635
 __do_sys_add_key security/keys/keyctl.c:126 [inline]
 __se_sys_add_key+0x263/0x350 security/keys/keyctl.c:74
 __x64_sys_add_key+0x67/0x80 security/keys/keyctl.c:74
 x64_sys_call+0x28c4/0x2ff0 arch/x86/include/generated/asm/syscalls_64.h:249
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xd2/0x200 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 UID: 0 PID: 30554 Comm: syz.9.20007 Tainted: G        W           syzkaller #0 PREEMPT(voluntary) 
Tainted: [W]=WARN
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
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