[Bug 2149854] Re: Crash on /proc/%s/stat not found

[Daniel Tang]

*** This bug is a duplicate of bug 2149759 ***
    https://bugs.launchpad.net/bugs/2149759

** This bug has been marked a duplicate of bug 2149759
   Crash on termux proot distro /proc/727/stat

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https://bugs.launchpad.net/bugs/2149854

Title:
  Crash on /proc/%s/stat not found

Status in update-manager package in Ubuntu:
  New

Bug description:
  Trying to upgrade from Noble to Resolute on proot-distro inside Termux
  inside Android 14 OS with 4.19 Linux kernel and got this crash. It
  assumes that /proc/%s/stat is always present, but perhaps Android
  withholds it thus the crash. Fix, I think, should put an try ...
  except: continue in it.

  Traceback (most recent call last):                                                         File "/tmp/ubuntu-release-upgrader-ipjerrcr/resolute", line 8, in <module>                 sys.exit(main())                                                                                  ^^^^^^                                                                        File "/tmp/ubuntu-release-upgrader-ipjerrcr/DistUpgrade/DistUpgradeMain.py", line 235, in main                                                                                      if app.run():
         ^^^^^^^^^                                                                           File "/tmp/ubuntu-release-upgrader-ipjerrcr/DistUpgrade/DistUpgradeController.py", line 1985, in run
      return self.fullUpgrade()
             ^^^^^^^^^^^^^^^^^^
    File "/tmp/ubuntu-release-upgrader-ipjerrcr/DistUpgrade/DistUpgradeController.py", line 1799, in fullUpgrade                                                                        if not self.prepare():                                                                          ^^^^^^^^^^^^^^
    File "/tmp/ubuntu-release-upgrader-ipjerrcr/DistUpgrade/DistUpgradeController.py", line 449, in prepare                                                                             self._sshMagic()                                                                       File "/tmp/ubuntu-release-upgrader-ipjerrcr/DistUpgrade/DistUpgradeController.py", line 351, in _sshMagic                                                                           is_child_of_process_name("sshd")):                                                       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^                                                       File "/tmp/ubuntu-release-upgrader-ipjerrcr/DistUpgrade/utils.py", line 108, in is_child_of_process_name                                                                            with open(stat_file) as stat_f:                                                               ^^^^^^^^^^^^^^^                                                                 FileNotFoundError: [Errno 2] No such file or directory: '/proc/727/stat'

  ProblemType: Bug
  DistroRelease: Ubuntu 24.04
  Package: update-manager (not installed)
  Uname: Linux 6.17.0-PRoot-Distro aarch64
  ApportVersion: 2.28.1-0ubuntu3.8
  Architecture: arm64
  CasperMD5CheckResult: unknown
  Date: Wed Apr 22 09:51:13 2026
  ProcEnviron:
   LANG=en_US.UTF-8
   PATH=(custom, no user)
   TERM=xterm-256color
  SourcePackage: update-manager
  UpgradeStatus: Upgraded to noble on 2026-04-20 (2 days ago)

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