[Bug 2105510] Re: network page broken following libnl changes

[Olivier Gayot]

** Changed in: subiquity (Ubuntu)
       Status: New => Fix Committed

** Changed in: subiquity
       Status: In Progress => Fix Committed

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Title:
  network page broken following libnl changes

Status in subiquity:
  Fix Committed
Status in probert package in Ubuntu:
  Fix Committed
Status in subiquity package in Ubuntu:
  Fix Committed

Bug description:
  The move from core22 to core24 broke the network TUI screen in two
  ways:

  * After moving from "disabled" to DHCP, the IP will not be visible once the lease has been acquired. This is because of a mismatch between Subiquity's Link instance and the one that probert knows about.
  * A segmentation fault (sometimes) of Subiquity when setting an interface as up/down. This is because we try to set flags on the wrong rtnl_link object.

  Program terminated with signal SIGSEGV, Segmentation fault.
  #0  0x0000000000000000 in ?? ()
  [Current thread is 1 (LWP 2135)]
  (gdb) bt
  #0  0x0000000000000000 in ?? ()
  #1  0x00007db7d4d22652 in rtnl_link_build_change_request ()
     from /snap/core24/current/lib/x86_64-linux-gnu/libnl-route-3.so.200
  #2  0x00007db7d4d22768 in rtnl_link_change () from /snap/core24/current/lib/x86_64-linux-gnu/libnl-route-3.so.200
  #3  0x00007db7d4d7cb36 in listener_unset_link_flags (self=<optimized out>, args=<optimized out>, kw=<optimized out>)
      at probert/_rtnetlinkmodule.c:461
  #4  0x0000000000551598 in ?? ()
  #5  0x0000000000549b85 in PyObject_Vectorcall ()
  #6  0x00000000005d73c9 in _PyEval_EvalFrameDefault ()
  #7  0x000000000066c229 in ?? ()
  #8  0x00007db7d7a69d44 in ?? ()
     from /snap/subiquity/6519/usr/lib/python3.12/lib-dynload/_asyncio.cpython-312-x86_64-linux-gnu.so
  #9  0x00007db7d7a69c56 in ?? ()
     from /snap/subiquity/6519/usr/lib/python3.12/lib-dynload/_asyncio.cpython-312-x86_64-linux-gnu.so
  #10 0x0000000000581fa2 in ?? ()
  #11 0x00000000006a48d3 in ?? ()
  #12 0x0000000000581f0d in ?? ()
  #13 0x00000000005db55b in _PyEval_EvalFrameDefault ()
  #14 0x00000000005d58eb in PyEval_EvalCode ()
  #15 0x00000000005d347c in ?? ()
  #16 0x0000000000581f0d in ?? ()
  #17 0x0000000000549b85 in PyObject_Vectorcall ()
  #18 0x00000000005d73c9 in _PyEval_EvalFrameDefault ()
  #19 0x00000000006bcce2 in ?? ()
  #20 0x00000000006bc912 in Py_RunMain ()
  #21 0x00000000006bc57d in Py_BytesMain ()
  #22 0x00007db7d87671ca in ?? () from /snap/core24/current/lib/x86_64-linux-gnu/libc.so.6
  #23 0x00007db7d876728b in __libc_start_main () from /snap/core24/current/lib/x86_64-linux-gnu/libc.so.6
  #24 0x0000000000657ce5 in _start ()

  After running a bisect, I found that the following change in libnl was
  what triggered both regressions in Subiquity:

  https://github.com/thom311/libnl/pull/264

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