[Bug 2060894] Re: dialogue won't start, high cpu usage

[Olivier Gayot]

Marking fix released for subiquity (Ubuntu). Since I have never been
able to reproduce the crash, I can hardly confirm that it is really
fixed. However, I can confirm that the probert code present in the
candidate snap contains the intended fix.

  24.04/candidate: 24.04.3 2025-07-29 (6806) 21MB classic


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

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https://bugs.launchpad.net/bugs/2060894

Title:
  dialogue won't start, high cpu usage

Status in probert:
  Fix Committed
Status in subiquity:
  Fix Released
Status in ubuntu-desktop-provision:
  Invalid
Status in subiquity package in Ubuntu:
  Fix Released
Status in subiquity source package in Noble:
  Fix Released
Status in subiquity source package in Plucky:
  Fix Released

Bug description:
  I connected the system to wifi using gnome's settings.

  Stuck at the "Preparing Ubuntu..." screen burning 100% cpu on one
  core.

  The process burning CPU (currently at 27m runtime) is:

  python3 -m subiquity.cmd.server --use-os-prober --storage-version=2
  --postinst-hooks-dir=/snap/ubuntu-desktop-
  bootstrap/107/etc/subiquity/postinst.d

  strace shows no output when run for several seconds, so no syscalls in
  the hot loop

  I generated a core dump of the running process using GDB, but at 627M
  I don't think it is going anywhere. When I attach with gdb I see:

  0x00007f23d27ce5bb in nl80211_get_ie (ie=0 '\000', ies_len=<optimized
  out>, ies=<optimized out>) at probert/_nl80211module.c

  
  warning: 378  probert/_nl80211module.c: No such file or directory

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