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BUG: KCSAN: data-race in file_remove_privs / new_sync_write

write to 0xffff88811d15a79c of 4 bytes by task 9263 on cpu 1:
 inode_has_no_xattr include/linux/fs.h:3569 [inline]
 file_remove_privs+0x1c9/0x2a0 fs/inode.c:1863
 __generic_file_write_iter+0xc4/0x370 mm/filemap.c:3377
 generic_file_write_iter+0x294/0x38e mm/filemap.c:3463
 call_write_iter include/linux/fs.h:1907 [inline]
 new_sync_write+0x303/0x400 fs/read_write.c:484
 __vfs_write+0x9e/0xb0 fs/read_write.c:497
 vfs_write fs/read_write.c:559 [inline]
 vfs_write+0x189/0x380 fs/read_write.c:543
 ksys_pwrite64+0xe4/0x110 fs/read_write.c:666
 __do_sys_pwrite64 fs/read_write.c:676 [inline]
 __se_sys_pwrite64 fs/read_write.c:673 [inline]
 __x64_sys_pwrite64+0x5b/0x70 fs/read_write.c:673
 do_syscall_64+0xc7/0x3b0 arch/x86/entry/common.c:295
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

read to 0xffff88811d15a79c of 4 bytes by task 9217 on cpu 0:
 iocb_flags include/linux/fs.h:3428 [inline]
 init_sync_kiocb include/linux/fs.h:2080 [inline]
 new_sync_write+0x3c8/0x400 fs/read_write.c:480
 __vfs_write+0x9e/0xb0 fs/read_write.c:497
 vfs_write fs/read_write.c:559 [inline]
 vfs_write+0x189/0x380 fs/read_write.c:543
 ksys_pwrite64+0xe4/0x110 fs/read_write.c:666
 __do_sys_pwrite64 fs/read_write.c:676 [inline]
 __se_sys_pwrite64 fs/read_write.c:673 [inline]
 __x64_sys_pwrite64+0x5b/0x70 fs/read_write.c:673
 do_syscall_64+0xc7/0x3b0 arch/x86/entry/common.c:295
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 9217 Comm: syz-executor.2 Not tainted 5.7.0-rc1-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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