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BUG: KCSAN: data-race in __alloc_file / __alloc_file

write to 0xffff8880bb157398 of 4 bytes by task 10993 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
 anon_inode_getfile fs/anon_inodes.c:91 [inline]
 anon_inode_getfile+0x103/0x1d0 fs/anon_inodes.c:74
 __do_sys_perf_event_open+0xd32/0x1ac0 kernel/events/core.c:11100
 __se_sys_perf_event_open kernel/events/core.c:10867 [inline]
 __x64_sys_perf_event_open+0x70/0x90 kernel/events/core.c:10867
 do_syscall_64+0xcc/0x370 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

write to 0xffff8880bb157398 of 4 bytes by task 11004 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
 path_openat+0x74/0x36e0 fs/namei.c:3514
 do_filp_open+0x11e/0x1b0 fs/namei.c:3555
 do_sys_open+0x3b3/0x4f0 fs/open.c:1097
 __do_sys_open fs/open.c:1115 [inline]
 __se_sys_open fs/open.c:1110 [inline]
 __x64_sys_open+0x55/0x70 fs/open.c:1110
 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: 11004 Comm: syz-executor.5 Not tainted 5.4.0-rc3+ #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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