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BUG: KCSAN: data-race in copy_creds / prepare_creds

write to 0xffff888101718468 of 4 bytes by task 19194 on cpu 0:
 get_cred_many include/linux/cred.h:218 [inline]
 copy_creds+0x78/0x340 kernel/cred.c:278
 copy_process+0x62f/0x20b0 kernel/fork.c:2084
 kernel_clone+0x16b/0x5d0 kernel/fork.c:2653
 __do_sys_clone3 kernel/fork.c:2955 [inline]
 __se_sys_clone3+0x1f5/0x230 kernel/fork.c:2934
 __x64_sys_clone3+0x31/0x40 kernel/fork.c:2934
 x64_sys_call+0x580/0x3020 arch/x86/include/generated/asm/syscalls_64.h:436
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x12c/0x370 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

read to 0xffff8881017183c0 of 184 bytes by task 19199 on cpu 1:
 prepare_creds+0x6d/0x540 kernel/cred.c:192
 __sys_setfsgid+0x8f/0x1f0 kernel/sys.c:962
 __do_sys_setfsgid kernel/sys.c:986 [inline]
 __se_sys_setfsgid kernel/sys.c:984 [inline]
 __x64_sys_setfsgid+0x1e/0x30 kernel/sys.c:984
 x64_sys_call+0x294c/0x3020 arch/x86/include/generated/asm/syscalls_64.h:124
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x12c/0x370 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 UID: 0 PID: 19199 Comm: syz.3.3491 Tainted: G        W           syzkaller #0 PREEMPT(full) 
Tainted: [W]=WARN
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
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