[Bug 2142839] Re: crash during installer update while installing 26.04 snapshot4 (on s390x)

[Olivier Gayot]

*** This bug is a duplicate of bug 2146422 ***
    https://bugs.launchpad.net/bugs/2146422

Based on the logs, this is the same issue as in bug 2146422 on a
different architecture.

The server process was accidentally restarted twice more tan necessary,
resulting in a total of 4 different server processes started.

subiquity-server-debug.log.2486:2026-02-27 09:50:52,434 INFO subiquity:246 Starting Subiquity server revision 7063 of snap /snap/subiquity/7063 of version 25.10+git127.0ac86867
subiquity-server-debug.log.3317:2026-02-27 09:52:28,934 INFO subiquity:234 Starting Subiquity server revision 7083 of snap /snap/subiquity/7083 of version 25.10+git148.615bbf9c
subiquity-server-debug.log.3381:2026-02-27 09:52:32,329 INFO subiquity:234 Starting Subiquity server revision 7083 of snap /snap/subiquity/7083 of version 25.10+git148.615bbf9c
subiquity-server-debug.log.3479:2026-02-27 09:52:35,671 INFO subiquity:234 Starting Subiquity server revision 7083 of snap /snap/subiquity/7083 of version 25.10+git148.615bbf9c

PID 3317 and 3382 were restarted because of the /refresh/progress that
they received from the serial client:

subiquity-server-debug.log.3317:2026-02-27 09:52:28,995 DEBUG curtin.reporting.start.subiquity/Refresh/progress_GET:45 start: subiquity/Refresh/progress_GET: 
subiquity-server-debug.log.3317:2026-02-27 09:52:28,995 DEBUG subiquity.common.api.server:83 /refresh/progress waiting on start
subiquity-server-debug.log.3317:2026-02-27 09:52:29,578 DEBUG subiquity.common.api.server:85 /refresh/progress resuming
subiquity-server-debug.log.3381:2026-02-27 09:52:32,674 DEBUG curtin.reporting.start.subiquity/Refresh/progress_GET:45 start: subiquity/Refresh/progress_GET: 
subiquity-server-debug.log.3381:2026-02-27 09:52:32,675 DEBUG subiquity.common.api.server:83 /refresh/progress waiting on start
subiquity-server-debug.log.3381:2026-02-27 09:52:32,964 DEBUG subiquity.common.api.server:85 /refresh/progress resuming

This PR (that I just merged) should address the issue:
https://github.com/canonical/subiquity/pull/2348

Thanks

** This bug has been marked a duplicate of bug 2146422
   Client crash after refresh with ServerDisconnectedError

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https://bugs.launchpad.net/bugs/2142839

Title:
  crash during installer update while installing 26.04 snapshot4 (on
  s390x)

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

Bug description:
  While doing a 26.04 snapshot4 test installation (on s390x) I got a notification that an installer update is available.
  While doing that the installer crash and I found the following error in the logs:

   2026-02-27 09:52:28,967 DEBUG asyncio:64 Using selector: EpollSelector
   2026-02-27 09:52:28,967 DEBUG subiquitycore.screen:128 KDGKBTYPE returned b'\x02', is_linux_tty True
   2026-02-27 09:52:29,671 DEBUG subiquity.common.errorreport:386 generating crash report
   2026-02-27 09:52:29,675 INFO subiquity.common.errorreport:412 saving crash report 'Installer UI crashed with ServerDisconnectedError' to /var/crash/1772185949.671535730.ui.crash
   2026-02-27 09:52:29,675 INFO subiquity/ErrorReporter/1772185949.671535730.ui/add_info:104 start:
  InstallerClientLogInfo:
   2026-02-27 09:52:28,966 INFO subiquity:134 Starting Subiquity TUI revision 7083 of snap /snap/subiquity/7083
   2026-02-27 09:52:28,966 INFO subiquity:135 Arguments passed: ['/snap/subiquity/7083/usr/bin/subiquity']
   2026-02-27 09:52:29,675 INFO subiquity.common.errorreport:412 saving crash report 'Installer UI crashed with ServerDisconnectedError' to /var/crash/1772185949.671535730.ui.crash
   2026-02-27 09:52:29,675 INFO subiquity/ErrorReporter/1772185949.671535730.ui/add_info:104 start:
  InstallerJournal:

  I'm attaching entire /var/crash and /var/log.

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