On Wed, Mar 01, 2017 at 11:45:52AM +0000, Nick Alcock wrote: > [Resend, after the first attempt, from my home address, failed with > endless greylisting followed by "4.5.0 Interactive router timed out" > from all but the lowest-priority MX for vger, and "Name server: > bl-ckh-le.kernel.org.: host not found" for the apparently-nonexistent > lowest-priority MX. Maybe it'll work better from here.] > > I first spotted this -- or it spotted me -- back in the v4.7.x days. It > is still present in v4.10. > > Here's a replication recipe, given a reasonable rootfs with a compiler > on it, and assuming a blank virtio disk on /dev/vdb: > Hi Nick, thanks for reporting this. I've sent a patch which should fix this, and Cc'ed you. This actually seems to been a bug for a very long time, maybe even ever since the inline_data feature was introduced. (I was able to reproduce it in a 3.18 kernel, at least.) I'm not sure why it didn't get noticed earlier --- maybe hardly anyone ever writes to small files with mmap... - Eric
