bad case: running into a hang - takes at least 2 minutes
good case: migrates without error in <20s; I'm migrating forward and back 
between two systems to be sure (in case anything is flaky) and ready (start the 
next test with the same conditions).

git bisect start
git bisect good v6.8.0
git bisect bad v6.9.0
c1cfbaab25 - good
4ced77a309 - good
862f7e5c73 - good
b866adf8d9 - good
ab6439b960 - good
b87cfc957f - bad
ae23a87d85 - bad
7d959c302d - bad
ea7af657f1 - good

Identified:

commit 7d959c302d10e97390b171334b885887de427a32
Author: Andrea Bolognani <[email protected]>
Date:   Tue Oct 27 00:15:33 2020 +0100

    rpc: Fix virt-ssh-helper detection
    
    When trying to figure out whether virt-ssh-helper is available
    on the remote host, we mistakenly look for the helper by the
    name it had while the feature was being worked on instead of
    the one that was ultimately picked, and thus end up using the
    netcat fallback every single time.
    
    Fixes: f8ec7c842df9e40c6607eae9b0223766cb226336
    Signed-off-by: Andrea Bolognani <[email protected]>
    Reviewed-by: Neal Gompa <[email protected]>
    Reviewed-by: Daniel P. Berrangé <[email protected]>

 src/rpc/virnetclient.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

Ok that makes a bit of sense, first we had in 6.8
  f8ec7c84 rpc: use new virt-ssh-helper binary for remote tunnelling
That makes it related to tunneling which is our broken use-case.

The identified commit "7d959c30 rpc: Fix virt-ssh-helper detection" then
might finally enable the new helper and that is the broken one?

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https://bugs.launchpad.net/bugs/1904584

Title:
  libvirt 6.8 / qemu 5.1 - --p2p --tunnelled is hanging

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