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BUG: KCSAN: data-race in init_file / prepare_creds

write to 0xffff888101664528 of 4 bytes by task 3603 on cpu 0:
 get_cred_many include/linux/cred.h:219 [inline]
 get_cred include/linux/cred.h:235 [inline]
 init_file+0x2e/0x1c0 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_getfile+0xa0/0x120 fs/anon_inodes.c:204
 __do_sys_perf_event_open kernel/events/core.c:13754 [inline]
 __se_sys_perf_event_open+0xb84/0x1210 kernel/events/core.c:13456
 __x64_sys_perf_event_open+0x67/0x80 kernel/events/core.c:13456
 x64_sys_call+0x78c/0x3000 arch/x86/include/generated/asm/syscalls_64.h:299
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xca/0x2b0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

read to 0xffff888101664480 of 184 bytes by task 3605 on cpu 1:
 prepare_creds+0x6e/0x550 kernel/cred.c:192
 copy_creds+0x8f/0x340 kernel/cred.c:286
 copy_process+0x638/0x1ef0 kernel/fork.c:2086
 kernel_clone+0x16c/0x5c0 kernel/fork.c:2651
 __do_sys_clone kernel/fork.c:2792 [inline]
 __se_sys_clone kernel/fork.c:2776 [inline]
 __x64_sys_clone+0xe6/0x120 kernel/fork.c:2776
 x64_sys_call+0x12d0/0x3000 arch/x86/include/generated/asm/syscalls_64.h:57
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xca/0x2b0 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: 3605 Comm: syz.1.39 Not tainted syzkaller #0 PREEMPT(voluntary) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
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