https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=237441
Bug ID: 237441
Summary: Virtio net consistently truncates last byte of a fetch
xfer with > 8956 bytes of payload
Product: Base System
Version: 12.0-RELEASE
Hardware: amd64
OS: Any
Status: New
Severity: Affects Some People
Priority: ---
Component: kern
Assignee: b...@freebsd.org
Reporter: bugme...@mailinator.com
Reading 215737 carefully, I couldn't decide if this was the same problem but
ultimately decided it wasn't.
Environment: OSX High Sierra running QEMU and the 12.0 release qcow2 image
published on the FreeBSD site.
Qemu command line: qemu-system-x86_64 -m 2048 -hda
FreeBSD-12.0-RELEASE-amd64.qcow2 -netdev
user,id=mynet0,hostfwd=tcp:127.0.0.1:7722-:22 -device
virtio-net-pci,netdev=mynet0
Trying to install pkg fails. If you do the following command:
fetch http://pkg.freebsd.org/FreeBSD:12:amd64/latest/Latest/pkg.txz
you will consistently get the following (Note: with or without [TR]XCSUM
enabled):
fetch: pkg.txz appears to be truncated: 3395051/3395052 bytes
If you download the full package and use dd to grab all but the last byte, the
SHA256 sums match so the data's not corrupted, just missing the final byte (a
'Z') character. Furthermore, if you run tcpdump in the guest against the
vtnet0 interface while it's transferring you can see the final 'Z' byte in the
final packet so qemu is getting the data to the guest. If you then ktrace the
fetch process, you'll see that its final read *doesn't* have the 'Z' which
rules out a bug in fetch/libfetch.
Using fetch to test for sizing, I started downloading packages at the jumbo
frame boundary and found that packages <= 8956 bytes work and >= 8960 exhibit
the failure.
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