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BUG: KCSAN: data-race in init_file / prepare_creds

write to 0xffff888103cb02e8 of 4 bytes by task 10074 on cpu 0:
 get_cred_many include/linux/cred.h:218 [inline]
 get_cred include/linux/cred.h:234 [inline]
 init_file+0x2d/0x1b0 fs/file_table.c:158
 alloc_empty_file+0x8b/0x200 fs/file_table.c:241
 alloc_file fs/file_table.c:355 [inline]
 alloc_file_pseudo+0xf6/0x190 fs/file_table.c:384
 __anon_inode_getfile fs/anon_inodes.c:166 [inline]
 anon_inode_getfile+0xa0/0x120 fs/anon_inodes.c:204
 __do_sys_perf_event_open kernel/events/core.c:14103 [inline]
 __se_sys_perf_event_open+0xbf1/0x1290 kernel/events/core.c:13805
 __x64_sys_perf_event_open+0x67/0x80 kernel/events/core.c:13805
 x64_sys_call+0x2789/0x3020 arch/x86/include/generated/asm/syscalls_64.h:299
 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 0xffff888103cb0240 of 184 bytes by task 10073 on cpu 1:
 prepare_creds+0x6d/0x540 kernel/cred.c:192
 copy_creds+0x8f/0x340 kernel/cred.c:286
 copy_process+0x62f/0x20b0 kernel/fork.c:2084
 kernel_clone+0x16b/0x5d0 kernel/fork.c:2653
 __do_sys_clone kernel/fork.c:2794 [inline]
 __se_sys_clone kernel/fork.c:2778 [inline]
 __x64_sys_clone+0x143/0x180 kernel/fork.c:2778
 x64_sys_call+0x1222/0x3020 arch/x86/include/generated/asm/syscalls_64.h:57
 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: 10073 Comm: syz.2.1518 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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