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BUG: KCSAN: data-race in init_file / prepare_creds

write to 0xffff8881049530a8 of 4 bytes by task 7107 on cpu 1:
 get_cred_many include/linux/cred.h:222 [inline]
 get_cred include/linux/cred.h:238 [inline]
 init_file+0x2d/0x1b0 fs/file_table.c:183
 alloc_empty_file+0x85/0x1e0 fs/file_table.c:266
 alloc_file fs/file_table.c:396 [inline]
 alloc_file_pseudo+0x92/0x120 fs/file_table.c:427
 __anon_inode_getfile fs/anon_inodes.c:164 [inline]
 anon_inode_getfile+0xa0/0x120 fs/anon_inodes.c:202
 __do_sys_perf_event_open kernel/events/core.c:14179 [inline]
 __se_sys_perf_event_open+0xbf3/0x1250 kernel/events/core.c:13881
 __x64_sys_perf_event_open+0x67/0x80 kernel/events/core.c:13881
 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+0x136/0x3c0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

read to 0xffff888104953000 of 184 bytes by task 7106 on cpu 0:
 prepare_creds+0x71/0x550 kernel/cred.c:192
 __sys_setresgid+0x46c/0x570 kernel/sys.c:849
 __do_sys_setresgid kernel/sys.c:874 [inline]
 __se_sys_setresgid kernel/sys.c:872 [inline]
 __x64_sys_setresgid+0x3f/0x50 kernel/sys.c:872
 x64_sys_call+0x2aa1/0x3020 arch/x86/include/generated/asm/syscalls_64.h:120
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x136/0x3c0 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: 7106 Comm: syz.3.1049 Not tainted syzkaller #0 PREEMPT(lazy) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026
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