Public bug reported: During a routine "apt-get update; apt-get upgrade" of an Ubuntu Trusty machine, the update failed with the error "sudo: unknown uid 4000: who are you?".
After this error has occurred the machine is sluggish, and all attempts to fork a process fail with "-bash: fork: Cannot allocate memory". A forced reboot of the machine causes the machine to come back up, but SSH is now no longer in a working state, triggering various low level TCP errors, including "connection reset by peer". Given this is an AWS machine, and given that ssh is the only way in, this causes a fatal outage on the machine. This has happened on two separate machines so far. minfrin@syslog01:~$ sudo apt-get update; sudo apt-get upgrade; sudo apt-get autoremove; sudo shutdown -r now Ign http://eu-west-1.ec2.archive.ubuntu.com trusty InRelease Get:1 http://eu-west-1.ec2.archive.ubuntu.com trusty-updates InRelease [65.9 kB] Hit http://eu-west-1.ec2.archive.ubuntu.com trusty-backports InRelease Get:2 http://security.ubuntu.com trusty-security InRelease [65.9 kB] Hit http://eu-west-1.ec2.archive.ubuntu.com trusty Release.gpg Hit http://eu-west-1.ec2.archive.ubuntu.com trusty Release Get:3 http://eu-west-1.ec2.archive.ubuntu.com trusty-updates/main Sources [400 kB] Get:4 http://eu-west-1.ec2.archive.ubuntu.com trusty-updates/restricted Sources [6,331 B] Get:5 http://eu-west-1.ec2.archive.ubuntu.com trusty-updates/universe Sources [184 kB] Get:6 http://eu-west-1.ec2.archive.ubuntu.com trusty-updates/multiverse Sources [7,747 B] Get:7 http://eu-west-1.ec2.archive.ubuntu.com trusty-updates/main amd64 Packages [995 kB] Get:8 http://security.ubuntu.com trusty-security/main Sources [133 kB] Get:9 http://eu-west-1.ec2.archive.ubuntu.com trusty-updates/restricted amd64 Packages [17.1 kB] Get:10 http://eu-west-1.ec2.archive.ubuntu.com trusty-updates/universe amd64 Packages [417 kB] Get:11 http://security.ubuntu.com trusty-security/universe Sources [59.4 kB] Get:12 http://security.ubuntu.com trusty-security/main amd64 Packages [628 kB] Get:13 http://eu-west-1.ec2.archive.ubuntu.com trusty-updates/multiverse amd64 Packages [14.3 kB] Get:14 http://eu-west-1.ec2.archive.ubuntu.com trusty-updates/main Translation-en [489 kB] Get:15 http://eu-west-1.ec2.archive.ubuntu.com trusty-updates/multiverse Translation-en [7,430 B] Get:16 http://eu-west-1.ec2.archive.ubuntu.com trusty-updates/restricted Translation-en [3,978 B] Get:17 http://eu-west-1.ec2.archive.ubuntu.com trusty-updates/universe Translation-en [223 kB] Get:18 http://security.ubuntu.com trusty-security/universe amd64 Packages [172 kB] Hit http://eu-west-1.ec2.archive.ubuntu.com trusty-backports/main Sources Hit http://eu-west-1.ec2.archive.ubuntu.com trusty-backports/restricted Sources Hit http://eu-west-1.ec2.archive.ubuntu.com trusty-backports/universe Sources Hit http://eu-west-1.ec2.archive.ubuntu.com trusty-backports/multiverse Sources Hit http://eu-west-1.ec2.archive.ubuntu.com trusty-backports/main amd64 Packages Hit http://security.ubuntu.com trusty-security/main Translation-en Hit http://eu-west-1.ec2.archive.ubuntu.com trusty-backports/restricted amd64 Packages Hit http://eu-west-1.ec2.archive.ubuntu.com trusty-backports/universe amd64 Packages Hit http://eu-west-1.ec2.archive.ubuntu.com trusty-backports/multiverse amd64 Packages Hit http://eu-west-1.ec2.archive.ubuntu.com trusty-backports/main Translation-en Hit http://eu-west-1.ec2.archive.ubuntu.com trusty-backports/multiverse Translation-en Hit http://eu-west-1.ec2.archive.ubuntu.com trusty-backports/restricted Translation-en Hit http://security.ubuntu.com trusty-security/universe Translation-en Hit http://eu-west-1.ec2.archive.ubuntu.com trusty-backports/universe Translation-en Hit http://eu-west-1.ec2.archive.ubuntu.com trusty/main Sources Hit http://eu-west-1.ec2.archive.ubuntu.com trusty/restricted Sources Hit http://eu-west-1.ec2.archive.ubuntu.com trusty/universe Sources Hit http://eu-west-1.ec2.archive.ubuntu.com trusty/multiverse Sources Hit http://eu-west-1.ec2.archive.ubuntu.com trusty/main amd64 Packages Hit http://eu-west-1.ec2.archive.ubuntu.com trusty/restricted amd64 Packages Hit http://eu-west-1.ec2.archive.ubuntu.com trusty/universe amd64 Packages Hit http://eu-west-1.ec2.archive.ubuntu.com trusty/multiverse amd64 Packages Hit http://eu-west-1.ec2.archive.ubuntu.com trusty/main Translation-en Hit http://eu-west-1.ec2.archive.ubuntu.com trusty/multiverse Translation-en Hit http://eu-west-1.ec2.archive.ubuntu.com trusty/restricted Translation-en Hit http://eu-west-1.ec2.archive.ubuntu.com trusty/universe Translation-en Ign http://eu-west-1.ec2.archive.ubuntu.com trusty/main Translation-en_US Ign http://eu-west-1.ec2.archive.ubuntu.com trusty/multiverse Translation-en_US Ign http://eu-west-1.ec2.archive.ubuntu.com trusty/restricted Translation-en_US Ign http://eu-west-1.ec2.archive.ubuntu.com trusty/universe Translation-en_US Get:19 https://repo.hogarthww.com testing InRelease Get:20 https://repo.hogarthww.com testing InRelease Get:21 https://repo.hogarthww.com testing/main amd64 Packages Get:22 https://repo.hogarthww.com testing/main Translation-en_US Get:23 https://repo.hogarthww.com testing/main Translation-en_US Ign https://repo.hogarthww.com testing/main Translation-en_US Ign https://repo.hogarthww.com testing/main Translation-en Ign https://repo.hogarthww.com testing/main Translation-en_US Ign https://repo.hogarthww.com testing/main Translation-en Fetched 3,957 kB in 3s (1,191 kB/s) Reading package lists... Done Reading package lists... Done Building dependency tree Reading state information... Done Calculating upgrade... Done The following packages were automatically installed and are no longer required: linux-headers-3.13.0-106 linux-headers-3.13.0-106-generic linux-headers-3.13.0-116 linux-headers-3.13.0-116-generic linux-headers-3.13.0-119 linux-headers-3.13.0-119-generic linux-image-3.13.0-106-generic linux-image-3.13.0-116-generic linux-image-3.13.0-119-generic Use 'apt-get autoremove' to remove them. The following packages will be upgraded: apport cloud-init grub-legacy-ec2 isc-dhcp-client isc-dhcp-common klibc-utils libipa-hbac0 libklibc libnss-sss libpam-sss libpq5 libsss-idmap0 libsss-sudo logrotate overlayroot python-sss python3-apport python3-problem-report python3-software-properties software-properties-common sssd sssd-ad sssd-ad-common sssd-common sssd-ipa sssd-krb5 sssd-krb5-common sssd-ldap sssd-proxy sssd-tools unattended-upgrades 31 upgraded, 0 newly installed, 0 to remove and 0 not upgraded. Need to get 0 B/3,283 kB of archives. After this operation, 16.4 kB of additional disk space will be used. Do you want to continue? [Y/n] y Extracting templates from packages: 100% Preconfiguring packages ... (Reading database ... 185967 files and directories currently installed.) Preparing to unpack .../libnss-sss_1.11.8-0ubuntu0.7_amd64.deb ... Unpacking libnss-sss:amd64 (1.11.8-0ubuntu0.7) over (1.11.8-0ubuntu0.5) ... Preparing to unpack .../isc-dhcp-client_4.2.4-7ubuntu12.10_amd64.deb ... Unpacking isc-dhcp-client (4.2.4-7ubuntu12.10) over (4.2.4-7ubuntu12.8) ... Preparing to unpack .../isc-dhcp-common_4.2.4-7ubuntu12.10_amd64.deb ... Unpacking isc-dhcp-common (4.2.4-7ubuntu12.10) over (4.2.4-7ubuntu12.8) ... Preparing to unpack .../logrotate_3.8.7-1ubuntu1.1_amd64.deb ... Unpacking logrotate (3.8.7-1ubuntu1.1) over (3.8.7-1ubuntu1) ... Preparing to unpack .../klibc-utils_2.0.3-0ubuntu1.14.04.3_amd64.deb ... Unpacking klibc-utils (2.0.3-0ubuntu1.14.04.3) over (2.0.3-0ubuntu1.14.04.2) ... Preparing to unpack .../libklibc_2.0.3-0ubuntu1.14.04.3_amd64.deb ... Unpacking libklibc (2.0.3-0ubuntu1.14.04.3) over (2.0.3-0ubuntu1.14.04.2) ... Preparing to unpack .../python3-problem-report_2.14.1-0ubuntu3.24_all.deb ... Unpacking python3-problem-report (2.14.1-0ubuntu3.24) over (2.14.1-0ubuntu3.23) ... Preparing to unpack .../python3-apport_2.14.1-0ubuntu3.24_all.deb ... Unpacking python3-apport (2.14.1-0ubuntu3.24) over (2.14.1-0ubuntu3.23) ... Preparing to unpack .../apport_2.14.1-0ubuntu3.24_all.deb ... apport stop/waiting Unpacking apport (2.14.1-0ubuntu3.24) over (2.14.1-0ubuntu3.23) ... Preparing to unpack .../libpq5_9.3.17-0ubuntu0.14.04_amd64.deb ... Unpacking libpq5 (9.3.17-0ubuntu0.14.04) over (9.3.16-0ubuntu0.14.04) ... Preparing to unpack .../software-properties-common_0.92.37.8_all.deb ... Unpacking software-properties-common (0.92.37.8) over (0.92.37.7) ... Preparing to unpack .../unattended-upgrades_0.82.1ubuntu2.5_all.deb ... Unpacking unattended-upgrades (0.82.1ubuntu2.5) over (0.82.1ubuntu2.4) ... Preparing to unpack .../python3-software-properties_0.92.37.8_all.deb ... Unpacking python3-software-properties (0.92.37.8) over (0.92.37.7) ... Preparing to unpack .../cloud-init_0.7.5-0ubuntu1.22_all.deb ... Unpacking cloud-init (0.7.5-0ubuntu1.22) over (0.7.5-0ubuntu1.21) ... Preparing to unpack .../grub-legacy-ec2_0.7.5-0ubuntu1.22_all.deb ... Leaving 'diversion of /usr/sbin/grub-set-default to /usr/sbin/grub-set-default.real by grub-legacy-ec2' Unpacking grub-legacy-ec2 (0.7.5-0ubuntu1.22) over (0.7.5-0ubuntu1.21) ... Preparing to unpack .../sssd-ldap_1.11.8-0ubuntu0.7_amd64.deb ... Unpacking sssd-ldap (1.11.8-0ubuntu0.7) over (1.11.8-0ubuntu0.5) ... Preparing to unpack .../sssd-krb5_1.11.8-0ubuntu0.7_amd64.deb ... Unpacking sssd-krb5 (1.11.8-0ubuntu0.7) over (1.11.8-0ubuntu0.5) ... Preparing to unpack .../sssd-ipa_1.11.8-0ubuntu0.7_amd64.deb ... Unpacking sssd-ipa (1.11.8-0ubuntu0.7) over (1.11.8-0ubuntu0.5) ... Preparing to unpack .../sssd-krb5-common_1.11.8-0ubuntu0.7_amd64.deb ... Unpacking sssd-krb5-common (1.11.8-0ubuntu0.7) over (1.11.8-0ubuntu0.5) ... Preparing to unpack .../sssd-proxy_1.11.8-0ubuntu0.7_amd64.deb ... Unpacking sssd-proxy (1.11.8-0ubuntu0.7) over (1.11.8-0ubuntu0.5) ... Preparing to unpack .../sssd-tools_1.11.8-0ubuntu0.7_amd64.deb ... Unpacking sssd-tools (1.11.8-0ubuntu0.7) over (1.11.8-0ubuntu0.5) ... Preparing to unpack .../sssd-common_1.11.8-0ubuntu0.7_amd64.deb ... Unpacking sssd-common (1.11.8-0ubuntu0.7) over (1.11.8-0ubuntu0.5) ... Preparing to unpack .../sssd_1.11.8-0ubuntu0.7_amd64.deb ... Unpacking sssd (1.11.8-0ubuntu0.7) over (1.11.8-0ubuntu0.5) ... Preparing to unpack .../sssd-ad_1.11.8-0ubuntu0.7_amd64.deb ... Unpacking sssd-ad (1.11.8-0ubuntu0.7) over (1.11.8-0ubuntu0.5) ... Preparing to unpack .../sssd-ad-common_1.11.8-0ubuntu0.7_amd64.deb ... Unpacking sssd-ad-common (1.11.8-0ubuntu0.7) over (1.11.8-0ubuntu0.5) ... Preparing to unpack .../python-sss_1.11.8-0ubuntu0.7_amd64.deb ... Unpacking python-sss (1.11.8-0ubuntu0.7) over (1.11.8-0ubuntu0.5) ... Preparing to unpack .../libsss-idmap0_1.11.8-0ubuntu0.7_amd64.deb ... Unpacking libsss-idmap0 (1.11.8-0ubuntu0.7) over (1.11.8-0ubuntu0.5) ... Preparing to unpack .../libipa-hbac0_1.11.8-0ubuntu0.7_amd64.deb ... Unpacking libipa-hbac0 (1.11.8-0ubuntu0.7) over (1.11.8-0ubuntu0.5) ... Preparing to unpack .../libpam-sss_1.11.8-0ubuntu0.7_amd64.deb ... Unpacking libpam-sss:amd64 (1.11.8-0ubuntu0.7) over (1.11.8-0ubuntu0.5) ... Preparing to unpack .../libsss-sudo_1.11.8-0ubuntu0.7_amd64.deb ... Unpacking libsss-sudo (1.11.8-0ubuntu0.7) over (1.11.8-0ubuntu0.5) ... Preparing to unpack .../overlayroot_0.25ubuntu1.14.04.2_all.deb ... Unpacking overlayroot (0.25ubuntu1.14.04.2) over (0.25ubuntu1.14.04.1) ... Processing triggers for man-db (2.6.7.1-1ubuntu1) ... Processing triggers for shared-mime-info (1.2-0ubuntu3) ... Processing triggers for hicolor-icon-theme (0.13-1) ... Processing triggers for ureadahead (0.100.0-16) ... Setting up libnss-sss:amd64 (1.11.8-0ubuntu0.7) ... Setting up isc-dhcp-common (4.2.4-7ubuntu12.10) ... Setting up isc-dhcp-client (4.2.4-7ubuntu12.10) ... Setting up logrotate (3.8.7-1ubuntu1.1) ... Setting up libklibc (2.0.3-0ubuntu1.14.04.3) ... Setting up klibc-utils (2.0.3-0ubuntu1.14.04.3) ... Setting up python3-problem-report (2.14.1-0ubuntu3.24) ... Setting up python3-apport (2.14.1-0ubuntu3.24) ... Setting up apport (2.14.1-0ubuntu3.24) ... apport start/running Setting up libpq5 (9.3.17-0ubuntu0.14.04) ... Setting up unattended-upgrades (0.82.1ubuntu2.5) ... Installing new version of config file /etc/apt/apt.conf.d/50unattended-upgrades ... Setting up python3-software-properties (0.92.37.8) ... Setting up software-properties-common (0.92.37.8) ... Setting up cloud-init (0.7.5-0ubuntu1.22) ... Leaving 'diversion of /etc/init/ureadahead.conf to /etc/init/ureadahead.conf.disabled by cloud-init' Setting up grub-legacy-ec2 (0.7.5-0ubuntu1.22) ... Searching for GRUB installation directory ... found: /boot/grub Searching for default file ... found: /boot/grub/default Testing for an existing GRUB menu.lst file ... found: /boot/grub/menu.lst Searching for splash image ... none found, skipping ... Found kernel: /boot/vmlinuz-3.13.0-123-generic Found kernel: /boot/vmlinuz-3.13.0-121-generic Found kernel: /boot/vmlinuz-3.13.0-119-generic Found kernel: /boot/vmlinuz-3.13.0-117-generic Found kernel: /boot/vmlinuz-3.13.0-116-generic Found kernel: /boot/vmlinuz-3.13.0-106-generic Updating /boot/grub/menu.lst ... done Setting up libsss-idmap0 (1.11.8-0ubuntu0.7) ... Setting up python-sss (1.11.8-0ubuntu0.7) ... Setting up sssd-common (1.11.8-0ubuntu0.7) ... Installing new version of config file /etc/init/sssd.conf ... Warning: found usr.sbin.sssd in /etc/apparmor.d/force-complain, forcing complain mode Warning failed to create cache: usr.sbin.sssd sssd start/running, process 14232 sssd-autofs stop/waiting Setting up libipa-hbac0 (1.11.8-0ubuntu0.7) ... Setting up libpam-sss:amd64 (1.11.8-0ubuntu0.7) ... Setting up libsss-sudo (1.11.8-0ubuntu0.7) ... Setting up overlayroot (0.25ubuntu1.14.04.2) ... Processing triggers for ureadahead (0.100.0-16) ... Setting up sssd-ad-common (1.11.8-0ubuntu0.7) ... Setting up sssd-proxy (1.11.8-0ubuntu0.7) ... Setting up sssd-tools (1.11.8-0ubuntu0.7) ... Setting up sssd-krb5-common (1.11.8-0ubuntu0.7) ... Setting up sssd-ldap (1.11.8-0ubuntu0.7) ... Setting up sssd-krb5 (1.11.8-0ubuntu0.7) ... Setting up sssd-ipa (1.11.8-0ubuntu0.7) ... Setting up sssd-ad (1.11.8-0ubuntu0.7) ... Setting up sssd (1.11.8-0ubuntu0.7) ... Processing triggers for libc-bin (2.19-0ubuntu6.13) ... Processing triggers for initramfs-tools (0.103ubuntu4.7) ... update-initramfs: Generating /boot/initrd.img-3.13.0-123-generic sudo: unknown uid 4000: who are you? sudo: unknown uid 4000: who are you? minfrin@syslog01:~$ df -h Filesystem Size Used Avail Use% Mounted on udev 492M 12K 492M 1% /dev tmpfs 100M 364K 99M 1% /run /dev/xvda1 7.8G 2.9G 4.6G 39% / none 4.0K 0 4.0K 0% /sys/fs/cgroup none 5.0M 0 5.0M 0% /run/lock none 497M 0 497M 0% /run/shm none 100M 0 100M 0% /run/user /dev/xvde 493G 272M 467G 1% /mnt/log-overlay overlayfs 493G 272M 467G 1% /var/log minfrin@syslog01:~$ less /etc/passwd passwd passwd- minfrin@syslog01:~$ less /etc/passwd passwd passwd- minfrin@syslog01:~$ less /etc/passwd passwd passwd- minfrin@syslog01:~$ less /etc/passwd minfrin@syslog01:~$ htop -bash: fork: Cannot allocate memory minfrin@syslog01:~$ htop -bash: fork: Cannot allocate memory minfrin@syslog01:~$ ps -bash: fork: Cannot allocate memory ** Affects: ubuntu Importance: Undecided Status: New -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1701751 Title: During routine apt-get update/upgrade: sudo: unknown uid 4000: who are you? 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