All of
 help / color / mirror / Atom feed
From: Christian Schoenebeck <>
Subject: [Bug 1877688] Re: 9p virtfs device reports error when opening certain files
Date: Sat, 15 Aug 2020 11:36:24 -0000	[thread overview]
Message-ID: <> (raw)

Fixed in QEMU 5.1 release.

** Changed in: qemu
       Status: Fix Committed => Fix Released

You received this bug notification because you are a member of qemu-
devel-ml, which is subscribed to QEMU.

  9p virtfs device reports error when opening certain files

Status in QEMU:
  Fix Released

Bug description:
  Reading certain files on a 9p mounted FS produces this error message:

  qemu-system-x86_64: VirtFS reply type 117 needs 12 bytes, buffer has
  12, less than minimum

  After this error message is generated, further accesses to the 9p FS
  hangs whatever tries to access it. The Arch Linux guest system is
  otherwise usable. This happens with QEMU 5.0.0 and guest kernel
  version 5.6.11, hosted on an Arch Linux distro. I use the following
  command to launch QEMU:

  exec qemu-system-x86_64 -enable-kvm -display gtk -vga virtio -cpu host
  -m 4G -netdev tap,ifname=vmtap0,id=vn0,script=no,downscript=no -device
  virtio-net-pci,netdev=vn0 -kernel kernel.img -drive
  file=file.img,format=raw,if=virtio -virtfs
  -append "console=ttyS0 root=/dev/vda rw"

  There's nothing relevant in the guest kernel logs as far as I'm aware
  of with loglevel set to 7.

  I tracked down the issue to readv() with a small buffer(<=12 bytes)
  and then a large buffer(>= 1024 bytes). A C program is provided to
  trigger this behavior.

To manage notifications about this bug go to:

      parent reply	other threads:[~2020-08-15 16:37 UTC|newest]

Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-05-09  0:05 [Bug 1877688] [NEW] 9p virtfs device reports error when opening certain files A A
2020-05-09  0:27 ` [Bug 1877688] " A A
2020-05-09  1:42 ` A A
2020-05-09 14:39 ` Christian Schoenebeck
2020-05-09 16:56 ` Christian Schoenebeck
2020-05-09 19:13 ` A A
2020-05-27 15:11 ` Christian Schoenebeck
2020-08-15 11:36 ` Christian Schoenebeck [this message]

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \ \ \ \

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.