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BUG: KCSAN: data-race in __alloc_file / copy_creds

write to 0xffff888106eb8458 of 4 bytes by task 8389 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_open_execat+0x111/0x3d0 fs/exec.c:857
 open_exec+0x50/0x80 fs/exec.c:889
 load_misc_binary+0x6f2/0x9a0 fs/binfmt_misc.c:214
 search_binary_handler fs/exec.c:1659 [inline]
 search_binary_handler+0x127/0x420 fs/exec.c:1636
 load_misc_binary+0x501/0x9a0 fs/binfmt_misc.c:237
 search_binary_handler fs/exec.c:1659 [inline]
 search_binary_handler+0x127/0x420 fs/exec.c:1636
 load_misc_binary+0x501/0x9a0 fs/binfmt_misc.c:237
 search_binary_handler fs/exec.c:1659 [inline]
 search_binary_handler+0x127/0x420 fs/exec.c:1636
 load_misc_binary+0x501/0x9a0 fs/binfmt_misc.c:237
 search_binary_handler fs/exec.c:1659 [inline]
 search_binary_handler+0x127/0x420 fs/exec.c:1636

write to 0xffff888106eb8458 of 4 bytes by task 8387 on cpu 0:
 get_cred include/linux/cred.h:253 [inline]
 copy_creds+0x258/0x340 kernel/cred.c:346
 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

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 8387 Comm: syz-executor.0 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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