This bug is awaiting verification that the linux-aws/5.15.0-1032.36
kernel in -proposed solves the problem. Please test the kernel and
update this bug with the results. If the problem is solved, change the
tag 'verification-needed-jammy' to 'verification-done-jammy'. If the
problem still exists, change the tag 'verification-needed-jammy' to
'verification-failed-jammy'.

If verification is not done by 5 working days from today, this fix will
be dropped from the source code, and this bug will be closed.

See https://wiki.ubuntu.com/Testing/EnableProposed for documentation how
to enable and use -proposed. Thank you!


** Tags removed: verification-done-jammy
** Tags added: kernel-spammed-jammy-linux-aws verification-needed-jammy

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https://bugs.launchpad.net/bugs/2002889

Title:
  5.15.0-58.64 breaks xen bridge networking (pvh domU)

Status in linux package in Ubuntu:
  Confirmed
Status in linux source package in Xenial:
  Fix Committed
Status in linux source package in Bionic:
  Fix Committed
Status in linux source package in Focal:
  Fix Committed
Status in linux source package in Jammy:
  Fix Released
Status in linux source package in Kinetic:
  Fix Released

Bug description:
  [Impact]                                                                      
                                                                                
                                                       
  Xen guests will not have network access. This fixes a regression due to the 
fix                                                                             
                                                         
  for CVE-2022-3643.                                                            
                                                                                
                                                       
                                                                                
                                                                                
                                                       
  [Testing]                                                                     
                                                                                
                                                       
  This has only been build-tested.                                              
                                                                                
                                                       
                                                                                
                                                                                
                                                       
  [Potential regression]                                                        
                                                                                
                                                       
  Xen guests might not have network access.
  ----------------------------------------------------------------------


  With 5.15.0-58.64-generic, bridge networking on xen is broken :

   no packet (check with tcpdump)  flowing between dom0 and any domUs 
  attached to a network bridge.
   downgrading to  5.15.0-57-generic fix the issue. Thus the patch to the 
netback driver seems the cause.

  relevant network config :

  brtctl show :
  br0           8000.XXXXXXXXXXX        no              eno1
         vif1.0

  relevant domU config :

  kernel = '/usr/lib/grub-xen/grub-i386-xen_pvh.bin'
  type = 'pvh'

  vif         = [ 'ip=192.168.10.10 ,bridge=br0' ]

  No message in dmesg, journal, xen logs..

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