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BUG: KCSAN: data-race in __alloc_file / copy_creds

write to 0xffff8880bac675d8 of 4 bytes by task 21562 on cpu 1:
 get_cred include/linux/cred.h:253 [inline]
 copy_creds+0x206/0x340 kernel/cred.c:345
 copy_process+0x926/0x3b50 kernel/fork.c:1884
 _do_fork+0xfe/0x6e0 kernel/fork.c:2366
 __do_sys_clone kernel/fork.c:2521 [inline]
 __se_sys_clone kernel/fork.c:2502 [inline]
 __x64_sys_clone+0x12b/0x160 kernel/fork.c:2502
 do_syscall_64+0xcc/0x370 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

write to 0xffff8880bac675d8 of 4 bytes by task 21563 on cpu 0:
 get_cred include/linux/cred.h:253 [inline]
 __alloc_file+0x74/0x210 fs/file_table.c:105
 alloc_empty_file+0x8f/0x180 fs/file_table.c:151
 alloc_file+0x4e/0x2b0 fs/file_table.c:193
 alloc_file_pseudo+0x11c/0x1b0 fs/file_table.c:232
 sock_alloc_file+0x65/0x120 net/socket.c:397
 __sys_socketpair+0x258/0x450 net/socket.c:1593
 __do_sys_socketpair net/socket.c:1622 [inline]
 __se_sys_socketpair net/socket.c:1619 [inline]
 __x64_sys_socketpair+0x5e/0x80 net/socket.c:1619
 do_syscall_64+0xcc/0x370 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 21563 Comm: syz-executor.4 Not tainted 5.4.0-rc6+ #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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