Does anyone know of anything I can do to move forward? -- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to python-apt in Ubuntu. https://bugs.launchpad.net/bugs/1771102
Title: 17.10->18.04 LTS hangs, CPU stalls in apt-pkg cache Status in python-apt package in Ubuntu: New Bug description: When I do as root: do-release-upgrade The bionic tarball is downloaded and the python based "bionic" process is forked. On the screen I see the first "Reading cache..." message and then the process spikes the CPU to 100% where it stays there forever (I waited 15-20 minutes and there was no change in CPU state). Here is the dist-upgrade log file: 2018-05-14 07:17:19,308 INFO uname information: 'Linux kitt 4.13.0-41-generic #46-Ubuntu SMP Wed May 2 13:38:30 UTC 2018 x86_64' 2018-05-14 07:17:19,594 INFO apt version: '1.5.1' 2018-05-14 07:17:19,594 INFO python version: '3.6.3 (default, Oct 3 2017, 21:45:48) [GCC 7.2.0]' 2018-05-14 07:17:19,596 INFO release-upgrader version '18.04.17' started 2018-05-14 07:17:19,600 INFO locale: 'en_US' 'UTF-8' 2018-05-14 07:17:19,605 INFO screen could not be run 2018-05-14 07:17:19,744 DEBUG Using 'DistUpgradeViewText' view 2018-05-14 07:17:19,788 DEBUG enable dpkg --force-overwrite 2018-05-14 07:17:19,817 DEBUG creating statefile: '/var/log/dist-upgrade/apt-clone_system_state.tar.gz' strace output of the "bionic" process: $ sudo strace -f -p 6469 strace: Process 6469 attached with 3 threads [pid 6546] restart_syscall(<... resuming interrupted poll ...> <unfinished ...> [pid 6547] restart_syscall(<... resuming interrupted poll ...>strace: [ Process PID=6469 runs in x32 mode. ] top output: PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND 6469 root 20 0 270048 33108 15728 R 99.7 0.1 0:38.85 bionic 6555 pisymbol 20 0 46736 4376 3344 R 0.7 0.0 0:00.04 top Looking at this further, it seems that the installer sets the the "rootdir=/" when it initiates the python-apt's Cache class. This hangs. I can reproduce this by simply changing it's test code to pass rootdir="/" and it hangs. It sorta smells like a deadlock issue though deep in the C++ module (apt_pkg) that backs the python one (GetLock?). But I'm not 100% sure. This behavior is seen on my 32-core Threadripper machine (AMD64). This is 17.10 latest with: $ dpkg -l python-apt libapt-pkg5.0 Desired=Unknown/Install/Remove/Purge/Hold | Status=Not/Inst/Conf-files/Unpacked/halF-conf/Half-inst/trig-aWait/Trig-pend |/ Err?=(none)/Reinst-required (Status,Err: uppercase=bad) ||/ Name Version Architecture Description +++-==============================================-============================-============================-================================================================================================= ii libapt-pkg5.0:amd64 1.5.1 amd64 package management runtime library ii python-apt 1.4.0~beta3build2 amd64 Python interface to libapt-pkg To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/python-apt/+bug/1771102/+subscriptions -- Mailing list: https://launchpad.net/~touch-packages Post to : touch-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp