On Wed, 6 Mar 2019 at 16:53, Michael Firth <MFirth@xxxxxxxxxx> wrote: > > Is there any way to get more debugging from what is going on? Try mounting with enospc_debug. > The system is running stock Debian 9 (Stretch). It was running their latest 4.9 kernel (Rev 4.9.144-3.1) when the problem first occurred. After two instances of the problem, I rolled back to their previous kernel (Rev 4.9.130-2), which the system had been running error free for several months, but the failures have continued. > 4.9 is pretty old for Btrfs. I'd use the backported kernel which currently is 4.19.
