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Bug#983047: linux-image-5.10.0-3-amd64: Virtualbox Shared Folder vboxsf in 5.10 is racy / unusable with git clone

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Package: src:linux
Version: 5.10.13-1
Severity: normal

Dear Maintainer,

The current kernel in testing has vboxsf properly integrated and signed.
With Buster, we should use VirtualBoxGuestAdditions.iso to dkms it.
It implies linux-headers, dkms, toolchain... 300 or 400 Mio of stuff.

The integrated vboxsf is way easy to use but it currently fails for "git
clone" like work loads. Steps to reproduce :
 * install debian testing in a virtualbox VM, everything as default
 * configure a shared folder in virtualbox
 * mount in from debian VM somewhere
 * from VM, go into this folder, then :
 * git clone https://a-random-non-empty-public-git-repo.git
 * it fails at unpacking stage.

If host is Windows, there is 2 problems (spurious EINTR, and "File Already exists").
If host is Linux, there is 1 problem (a third one : spurious EPERM)

It's reported, patches are written by one of the person who a have took
the initiative about mainline it, I use it since some weeks locally.

https://bugzilla.kernel.org/show_bug.cgi?id=211171
Hans de Goede has submited patches to fs and char-misc teams.

On 2021-02-18 only 1/5 patches are on linux-next. Kernel fs team seems
not have pickup the 4 remaining patches yet.

I don't know if it doable to get them for buster, but it should help
everyone who tries to use this feature.

Here we use it as a way to give local development env to web developers.

Please found the patches has Hans mailed me, they should appears in
linux-next soon.


-- Package-specific info:
** Version:
Linux version 5.10.0-3-amd64 (debian-kernel@lists.debian.org) (gcc-10 (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.1) #1 SMP Debian 5.10.13-1 (2021-02-06)

** Not tainted

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Bug#983047: linux-image-5.10.0-3-amd64: Virtualbox Shared Folder vboxsf in 5.10 is racy / unusable with git clone Ludovic Pouzenc <ludovic@pouzenc.fr> - 2021-02-18 16:40 +0100
  Bug#983047: Erratum Ludovic Pouzenc <ludovic.pouzenc@univ-smb.fr> - 2021-02-18 17:00 +0100

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