Date: Sun, 21 Apr 2019 16:06:25 +0000 From: bugzilla-noreply@freebsd.org To: bugs@FreeBSD.org Subject: [Bug 237441] Virtio net consistently truncates last byte of a fetch xfer with > 8956 bytes of payload Message-ID: <bug-237441-227@https.bugs.freebsd.org/bugzilla/>
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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: bugs@FreeBSD.org Reporter: bugmenot@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. -- You are receiving this mail because: You are the assignee for the bug.home | help
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