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BUG: KCSAN: data-race in init_file / prepare_creds

write to 0xffff888104055768 of 4 bytes by task 11651 on cpu 0:
 get_cred_many include/linux/cred.h:202 [inline]
 get_cred include/linux/cred.h:218 [inline]
 init_file+0x2e/0x1d0 fs/file_table.c:158
 alloc_empty_file+0x8b/0x200 fs/file_table.c:241
 alloc_file fs/file_table.c:354 [inline]
 alloc_file_pseudo+0xc6/0x160 fs/file_table.c:383
 __anon_inode_getfile fs/anon_inodes.c:166 [inline]
 __anon_inode_getfd fs/anon_inodes.c:291 [inline]
 anon_inode_getfd+0xc1/0x150 fs/anon_inodes.c:326
 bpf_map_new_fd+0x52/0x70 kernel/bpf/syscall.c:1191
 map_create+0xd25/0xda0 kernel/bpf/syscall.c:1602
 __sys_bpf+0x54e/0x7c0 kernel/bpf/syscall.c:6131
 __do_sys_bpf kernel/bpf/syscall.c:6259 [inline]
 __se_sys_bpf kernel/bpf/syscall.c:6257 [inline]
 __x64_sys_bpf+0x41/0x50 kernel/bpf/syscall.c:6257
 x64_sys_call+0x2aee/0x3000 arch/x86/include/generated/asm/syscalls_64.h:322
 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 0xffff8881040556c0 of 184 bytes by task 11652 on cpu 1:
 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+0x268/0x350 security/keys/keyctl.c:74
 __x64_sys_add_key+0x67/0x80 security/keys/keyctl.c:74
 x64_sys_call+0x28c8/0x3000 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: 1 UID: 0 PID: 11652 Comm: syz.3.2884 Not tainted syzkaller #0 PREEMPT(voluntary) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025
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