syzbot

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BUG: KCSAN: data-race in copy_creds / prepare_creds

write to 0xffff888103f50168 of 4 bytes by task 13882 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:2046
 kernel_clone+0x16c/0x5c0 kernel/fork.c:2609
 __do_sys_clone3 kernel/fork.c:2911 [inline]
 __se_sys_clone3+0x1c2/0x200 kernel/fork.c:2890
 __x64_sys_clone3+0x31/0x40 kernel/fork.c:2890
 x64_sys_call+0x1fc9/0x3000 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 0xffff888103f500c0 of 184 bytes by task 13883 on cpu 0:
 prepare_creds+0x6c/0x4c0 kernel/cred.c:219
 prepare_exec_creds+0x14/0xe0 kernel/cred.c:261
 prepare_bprm_creds fs/exec.c:1364 [inline]
 bprm_execve+0x70/0x970 fs/exec.c:1734
 do_execveat_common+0x6e6/0x750 fs/exec.c:1860
 do_execveat fs/exec.c:1945 [inline]
 __do_sys_execveat fs/exec.c:2019 [inline]
 __se_sys_execveat fs/exec.c:2013 [inline]
 __x64_sys_execveat+0x73/0x90 fs/exec.c:2013
 x64_sys_call+0x1fec/0x3000 arch/x86/include/generated/asm/syscalls_64.h:323
 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: 13883 Comm: syz.0.4270 Not tainted syzkaller #0 PREEMPT(voluntary) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
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