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From: Thomas Huth <1922102@bugs.launchpad.net>
To: qemu-devel@nongnu.org
Subject: [Bug 1922102] Re: Broken tap networking on macOS host
Date: Tue, 18 May 2021 04:26:49 -0000	[thread overview]
Message-ID: <162131201001.21648.13707166447065644667.malone@soybean.canonical.com> (raw)
In-Reply-To: 161720333927.2408.17717907169331715630.malonedeb@chaenomeles.canonical.com

Ticket has been moved here (thanks, Vladislav!):
https://gitlab.com/qemu-project/qemu/-/issues/335
... thus I'm closing this on Launchpad now.

** Bug watch added: gitlab.com/qemu-project/qemu/-/issues #335
   https://gitlab.com/qemu-project/qemu/-/issues/335

** Changed in: qemu
       Status: Incomplete => Invalid

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https://bugs.launchpad.net/bugs/1922102

Title:
  Broken tap networking on macOS host

Status in QEMU:
  Invalid

Bug description:
  Building QEMU with GLib newer than 2.58.3 corrupts tap networking on macOS hosts.
  Tap device was provided by Tun/Tap kernel extension installed from brew:
    brew install tuntap

  Checked revisions:
    553032d (v5.2.0)
    6d40ce0 (v6.0.0-rc1)

  Host:
   MacBook Pro (Retina, 15-inch, Mid 2015)
   macOS Catalina 10.15.6 (19G2021)

  Guest:
    Linux Ubuntu 4.4.0-206-generic x86_64
    Also tested macOS Catalina 10.15.7 as a guest, the behaviour is the same.

  QEMU command line:

  qemu-system-x86_64 \
    -drive file=hdd.qcow2,if=virtio,format=qcow2 \
    -m 3G \
    -nic tap,script=tap-up.sh

  tap-up.sh:

   #!/bin/sh

   TAPDEV="$1"
   BRIDGEDEV="bridge0"

   ifconfig "$BRIDGEDEV" addm "$TAPDEV"

  Enabling/disabling Hypervisor.Framework acceleration (`-accel hvf`)
  has no effect.

  How to reproduce:
    1. Build & install GLib > 2.58.3 (tested 2.60.7)
    2. Build qemu-system-x86_64 with GLib > 2.58.3
    3. Boot any guest with tap networking enabled
    4. See that the external network is inaccessible

  Hotfix:
    1. Build & install GLib 2.58.3
    2. Build qemu-system-x86_64 with GLib 2.58.3
    3. Boot any guest with tap networking enabled
    4. See that the external network is accessible, everything is working as expected

To manage notifications about this bug go to:
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      parent reply	other threads:[~2021-05-18  4:36 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-03-31 15:08 [Bug 1922102] [NEW] Broken tap networking on macOS host Vladislav Yaroshchuk
2021-04-17  7:40 ` [Bug 1922102] " Vladislav Yaroshchuk
2021-05-14 19:05 ` Thomas Huth
2021-05-18  4:26 ` Thomas Huth [this message]

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