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BUG: KCSAN: data-race in __alloc_file / __alloc_file

write to 0xffff8880b609cd58 of 4 bytes by task 23698 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
 create_pipe_files+0x22a/0x380 fs/pipe.c:776
 __do_pipe_flags+0x51/0x180 fs/pipe.c:807
 do_pipe2+0x3f/0x150 fs/pipe.c:855
 __do_sys_pipe fs/pipe.c:878 [inline]
 __se_sys_pipe fs/pipe.c:876 [inline]
 __x64_sys_pipe+0x2a/0x40 fs/pipe.c:876
 do_syscall_64+0xcc/0x370 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

write to 0xffff8880b609cd58 of 4 bytes by task 23692 on cpu 1:
 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
 sock_map_fd net/socket.c:420 [inline]
 __sys_socket+0xe8/0x170 net/socket.c:1515
 __do_sys_socket net/socket.c:1520 [inline]
 __se_sys_socket net/socket.c:1518 [inline]
 __x64_sys_socket+0x4c/0x60 net/socket.c:1518
 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: 1 PID: 23692 Comm: syz-executor.3 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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