[Bug 2143803] [NEW] Installation of resolute KVM guest crashed

Frank Heimes 2143803 at bugs.launchpad.net
Tue Mar 10 07:33:29 UTC 2026 

Public bug reported:

While investigating an issue that prevents resolute ISO images from
being promoted from pending to current, I did a manual (interactive)
install on a noble (24.04.4) KVM host with a resolute (snapshot4) KVM
guest and noticed that it ends up in a crash, reporting:

 2026-03-10 07:12:14,059 ERROR root:38 finish: subiquity/Install/install/curtin_install/run_curtin_step: FAIL:
 2026-03-10 07:12:14,078 ERROR root:38 finish: subiquity/Install/install/curtin_install: FAIL:
 2026-03-10 07:12:14,078 DEBUG subiquity.common.errorreport:386 generating crash report
 2026-03-10 07:12:14,150 INFO subiquity.common.errorreport:412 saving crash report 'curthooks crashed with CurtinInstallError' to /var/crash/1773126734.083451986.install_fail.crash
 2026-03-10 07:12:14,150 ERROR root:38 finish: subiquity/Install/install: FAIL:
 2026-03-10 07:12:14,150 INFO root:38 start: subiquity/ErrorReporter/1773126734.083451986.install_fail/add_info:
 2026-03-10 07:12:14,150 ERROR subiquity.server.server:536 top level error
 Traceback (most recent call last):
   File "/snap/subiquity/7096/lib/python3.12/site-packages/subiquity/server/controllers/install.py", line 249, in run_curtin_step
     await run_curtin_command(
   File "/snap/subiquity/7096/lib/python3.12/site-packages/subiquity/server/curtin.py", line 244, in run_curtin_command
     return await cmd.wait(input=input)
            ^^^^^^^^^^^^^^^^^^^^^^^^^^^
   File "/snap/subiquity/7096/lib/python3.12/site-packages/subiquity/server/curtin.py", line 125, in wait
     result = await self.runner.wait(self.proc, input=input)
              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   File "/snap/subiquity/7096/lib/python3.12/site-packages/subiquity/server/runner.py", line 112, in wait
     raise subprocess.CalledProcessError(
 subprocess.CalledProcessError: Command '['systemd-run', '--wait', '--same-dir', '--property', 'SyslogIdentifier=subiquity_log.1554', '--setenv', 'PATH=/snap/subiquity/7096/bin:/snap/subiquity/7096/usr/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/games:/snap/bin:/snap/subiquity/7096/bin:/snap/subiquity/7096/sbin', '--setenv', 'PYTHONPATH=:/snap/subiquity/7096/lib/python3.12/site-packages', '--setenv', 'PYTHON=/snap/subiquity/7096/usr/bin/python3.12', '--setenv', 'SNAP=/snap/subiquity/7096', '--', '/snap/subiquity/7096/usr/bin/python3.12', '-m', 'curtin', '--showtrace', '-vvv', '--set', 'json:reporting={"subiquity": {"type": "journald", "identifier": "curtin_event.1554.9"}}', '-c', '/var/log/installer/curtin-install/subiquity-curthooks.conf', 'install', '--set', 'json:stages=["curthooks"]']' returned non-zero exit status 1.

 During handling of the above exception, another exception occurred:

 Traceback (most recent call last):
   File "/snap/subiquity/7096/lib/python3.12/site-packages/subiquity/server/controllers/shutdown.py", line 72, in _wait_install
     await self.app.controllers.Install.install_task
   File "/snap/subiquity/7096/lib/python3.12/site-packages/subiquitycore/context.py", line 165, in decorated_async
     return await meth(self, **kw)
            ^^^^^^^^^^^^^^^^^^^^^^
   File "/snap/subiquity/7096/lib/python3.12/site-packages/subiquity/server/controllers/install.py", line 642, in install
     await self.curtin_install(context=context, source=for_install_path)
   File "/snap/subiquity/7096/lib/python3.12/site-packages/subiquitycore/context.py", line 165, in decorated_async
     return await meth(self, **kw)
            ^^^^^^^^^^^^^^^^^^^^^^
   File "/snap/subiquity/7096/lib/python3.12/site-packages/subiquity/server/controllers/install.py", line 460, in curtin_install
     await run_curtin_step(
   File "/snap/subiquity/7096/lib/python3.12/site-packages/subiquity/server/controllers/install.py", line 362, in run_curtin_step
     await self.run_curtin_step(
   File "/snap/subiquity/7096/lib/python3.12/site-packages/subiquitycore/context.py", line 165, in decorated_async
     return await meth(self, **kw)
            ^^^^^^^^^^^^^^^^^^^^^^
   File "/snap/subiquity/7096/lib/python3.12/site-packages/subiquity/server/controllers/install.py", line 260, in run_curtin_step
     raise CurtinInstallError(stages=stages)
 subiquity.server.controllers.install.CurtinInstallError
 2026-03-10 07:12:14,161 INFO root:38 finish: subiquity/Meta/status_GET: SUCCESS: 200 {"state": "ERROR", "confirming_tty": "/dev/ttysclp0", "error": {"state": "INC...
InstallerServerLogInfo:

I'm attaching the full /var/crash and /var/log folders.
(btw. the logs seem to be much bigger than usual, not sure if something changed recently ...)

** Affects: ubuntu-z-systems
     Importance: Critical
     Assignee: Skipper Bug Screeners (skipper-screen-team)
         Status: New

** Affects: subiquity (Ubuntu)
     Importance: Critical
         Status: New


** Tags: s390x ubuntu-26.04

** Attachment added: "ubu-vm-01_10.03.2026.tgz"
   https://bugs.launchpad.net/bugs/2143803/+attachment/5951165/+files/ubu-vm-01_10.03.2026.tgz

** Also affects: ubuntu-z-systems
   Importance: Undecided
       Status: New

** Changed in: ubuntu-z-systems
   Importance: Undecided => Critical

** Changed in: ubuntu-z-systems
     Assignee: (unassigned) => Skipper Bug Screeners (skipper-screen-team)

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https://bugs.launchpad.net/bugs/2143803

Title:
  Installation of resolute KVM guest crashed

Status in Ubuntu on IBM z Systems:
  New
Status in subiquity package in Ubuntu:
  New

Bug description:
  While investigating an issue that prevents resolute ISO images from
  being promoted from pending to current, I did a manual (interactive)
  install on a noble (24.04.4) KVM host with a resolute (snapshot4) KVM
  guest and noticed that it ends up in a crash, reporting:

   2026-03-10 07:12:14,059 ERROR root:38 finish: subiquity/Install/install/curtin_install/run_curtin_step: FAIL:
   2026-03-10 07:12:14,078 ERROR root:38 finish: subiquity/Install/install/curtin_install: FAIL:
   2026-03-10 07:12:14,078 DEBUG subiquity.common.errorreport:386 generating crash report
   2026-03-10 07:12:14,150 INFO subiquity.common.errorreport:412 saving crash report 'curthooks crashed with CurtinInstallError' to /var/crash/1773126734.083451986.install_fail.crash
   2026-03-10 07:12:14,150 ERROR root:38 finish: subiquity/Install/install: FAIL:
   2026-03-10 07:12:14,150 INFO root:38 start: subiquity/ErrorReporter/1773126734.083451986.install_fail/add_info:
   2026-03-10 07:12:14,150 ERROR subiquity.server.server:536 top level error
   Traceback (most recent call last):
     File "/snap/subiquity/7096/lib/python3.12/site-packages/subiquity/server/controllers/install.py", line 249, in run_curtin_step
       await run_curtin_command(
     File "/snap/subiquity/7096/lib/python3.12/site-packages/subiquity/server/curtin.py", line 244, in run_curtin_command
       return await cmd.wait(input=input)
              ^^^^^^^^^^^^^^^^^^^^^^^^^^^
     File "/snap/subiquity/7096/lib/python3.12/site-packages/subiquity/server/curtin.py", line 125, in wait
       result = await self.runner.wait(self.proc, input=input)
                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
     File "/snap/subiquity/7096/lib/python3.12/site-packages/subiquity/server/runner.py", line 112, in wait
       raise subprocess.CalledProcessError(
   subprocess.CalledProcessError: Command '['systemd-run', '--wait', '--same-dir', '--property', 'SyslogIdentifier=subiquity_log.1554', '--setenv', 'PATH=/snap/subiquity/7096/bin:/snap/subiquity/7096/usr/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/games:/snap/bin:/snap/subiquity/7096/bin:/snap/subiquity/7096/sbin', '--setenv', 'PYTHONPATH=:/snap/subiquity/7096/lib/python3.12/site-packages', '--setenv', 'PYTHON=/snap/subiquity/7096/usr/bin/python3.12', '--setenv', 'SNAP=/snap/subiquity/7096', '--', '/snap/subiquity/7096/usr/bin/python3.12', '-m', 'curtin', '--showtrace', '-vvv', '--set', 'json:reporting={"subiquity": {"type": "journald", "identifier": "curtin_event.1554.9"}}', '-c', '/var/log/installer/curtin-install/subiquity-curthooks.conf', 'install', '--set', 'json:stages=["curthooks"]']' returned non-zero exit status 1.

   During handling of the above exception, another exception occurred:

   Traceback (most recent call last):
     File "/snap/subiquity/7096/lib/python3.12/site-packages/subiquity/server/controllers/shutdown.py", line 72, in _wait_install
       await self.app.controllers.Install.install_task
     File "/snap/subiquity/7096/lib/python3.12/site-packages/subiquitycore/context.py", line 165, in decorated_async
       return await meth(self, **kw)
              ^^^^^^^^^^^^^^^^^^^^^^
     File "/snap/subiquity/7096/lib/python3.12/site-packages/subiquity/server/controllers/install.py", line 642, in install
       await self.curtin_install(context=context, source=for_install_path)
     File "/snap/subiquity/7096/lib/python3.12/site-packages/subiquitycore/context.py", line 165, in decorated_async
       return await meth(self, **kw)
              ^^^^^^^^^^^^^^^^^^^^^^
     File "/snap/subiquity/7096/lib/python3.12/site-packages/subiquity/server/controllers/install.py", line 460, in curtin_install
       await run_curtin_step(
     File "/snap/subiquity/7096/lib/python3.12/site-packages/subiquity/server/controllers/install.py", line 362, in run_curtin_step
       await self.run_curtin_step(
     File "/snap/subiquity/7096/lib/python3.12/site-packages/subiquitycore/context.py", line 165, in decorated_async
       return await meth(self, **kw)
              ^^^^^^^^^^^^^^^^^^^^^^
     File "/snap/subiquity/7096/lib/python3.12/site-packages/subiquity/server/controllers/install.py", line 260, in run_curtin_step
       raise CurtinInstallError(stages=stages)
   subiquity.server.controllers.install.CurtinInstallError
   2026-03-10 07:12:14,161 INFO root:38 finish: subiquity/Meta/status_GET: SUCCESS: 200 {"state": "ERROR", "confirming_tty": "/dev/ttysclp0", "error": {"state": "INC...
  InstallerServerLogInfo:

  I'm attaching the full /var/crash and /var/log folders.
  (btw. the logs seem to be much bigger than usual, not sure if something changed recently ...)

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