syzbot

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BUG: KCSAN: data-race in file_remove_privs / selinux_file_permission

write to 0xffff888130af9afc of 4 bytes by task 30862 on cpu 1:
 inode_has_no_xattr include/linux/fs.h:3653 [inline]
 file_remove_privs+0x312/0x3a0 fs/inode.c:1954
 __generic_file_write_iter+0xdd/0x300 mm/filemap.c:3735
 generic_file_write_iter+0x75/0x130 mm/filemap.c:3821
 call_write_iter include/linux/fs.h:2114 [inline]
 new_sync_write fs/read_write.c:518 [inline]
 vfs_write+0x69d/0x770 fs/read_write.c:605
 ksys_pwrite64 fs/read_write.c:712 [inline]
 __do_sys_pwrite64 fs/read_write.c:722 [inline]
 __se_sys_pwrite64 fs/read_write.c:719 [inline]
 __x64_sys_pwrite64+0xf5/0x150 fs/read_write.c:719
 do_syscall_64+0x4a/0x90 arch/x86/entry/common.c:47
 entry_SYSCALL_64_after_hwframe+0x44/0xae

read to 0xffff888130af9afc of 4 bytes by task 30826 on cpu 0:
 inode_has_perm security/selinux/hooks.c:1699 [inline]
 file_has_perm security/selinux/hooks.c:1797 [inline]
 selinux_revalidate_file_permission security/selinux/hooks.c:3697 [inline]
 selinux_file_permission+0x41b/0x530 security/selinux/hooks.c:3718
 security_file_permission+0x42/0xa0 security/security.c:1505
 rw_verify_area+0x136/0x250 fs/read_write.c:400
 vfs_write+0xe2/0x770 fs/read_write.c:596
 ksys_pwrite64 fs/read_write.c:712 [inline]
 __do_sys_pwrite64 fs/read_write.c:722 [inline]
 __se_sys_pwrite64 fs/read_write.c:719 [inline]
 __x64_sys_pwrite64+0xf5/0x150 fs/read_write.c:719
 do_syscall_64+0x4a/0x90 arch/x86/entry/common.c:47
 entry_SYSCALL_64_after_hwframe+0x44/0xae

value changed: 0x00000000 -> 0x00001000

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 30826 Comm: syz-executor.3 Not tainted 5.13.0-rc4-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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