XFCE panel writes too much data to disk
$ uptime
02:36:01 up 5 days, 5:25
$ cat /proc/`pidof xfce4-panel`/io
rchar: 59463779447
wchar: 6491892978
syscr: 65389539
syscw: 48586495
read_bytes: 806645760
write_bytes: 968708096
cancelled_write_bytes: 72359936
968,708,096 bytes written for five days. That's too much. I don't expect this process to touch my disk at all, as I don't change any panel or its applets settings.