apport information ** Tags added: apport-collected ec2-images
** Description changed: I've reached strange situation with Ubuntu 18.04 LTS with latest kernel on AWS m5.xlarge instance. System became unreachable after series of successful ssh logins. systemd -user became zombie and block main systemd daemon (PID 1). I've created bug https://github.com/systemd/systemd/issues/10123 but it was closed with "there's a problem with your kernel". https://github.com/systemd/systemd/issues/10123#issuecomment-423984751 Symptoms are very similar to https://github.com/systemd/systemd/issues/8598 apetren+ 26679 0.0 0.0 0 0 ? Z 02:56 0:00 \_ [(sd-pam)] <defunct> apetren+ 26855 0.0 0.0 76636 7816 ? Ds 02:57 0:00 /lib/systemd/systemd --user apetren+ 26856 0.0 0.0 0 0 ? Z 02:57 0:00 \_ [(sd-pam)] <defunct> apetren+ 26954 0.0 0.0 0 0 ? Zs 02:57 0:00 \_ [kill] <defunct> apetren+ 27053 0.0 0.0 76636 7496 ? Ss 02:58 0:00 /lib/systemd/systemd --user apetren+ 27054 0.0 0.0 193972 2768 ? S 02:58 0:00 \_ (sd-pam) This situation is repeatable on 7 instances 1-2 times per week. how to repeat: 1. Install ubuntu 18.04 LTS from official ubuntu image 2. update kernel and packages to latest version 3. from another instance run while `true` ;do ssh [email protected] "hostname; ps -ef|grep defunc |grep -v grep" ; done By this command in couple of days I have 2->4->6->8... zombies and in a hour system is frozen... sudo reboot is not working, because systemd with PID 1 is unreachable. kill -9 1 -- not working as well. # uname -r: Linux mainframe04 4.15.0-1021-aws #21-Ubuntu SMP Tue Aug 28 10:23:07 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux # cat /etc/lsb-release DISTRIB_ID=Ubuntu DISTRIB_RELEASE=18.04 DISTRIB_CODENAME=bionic DISTRIB_DESCRIPTION="Ubuntu 18.04.1 LTS" # systemd --version systemd 237 +PAM +AUDIT +SELINUX +IMA +APPARMOR +SMACK +SYSVINIT +UTMP +LIBCRYPTSETUP +GCRYPT +GNUTLS +ACL +XZ +LZ4 +SECCOMP +BLKID +ELFUTILS +KMOD -IDN2 +IDN -PCRE2 default-hierarchy=hybrid AWS instance m5.xlarge Please let me know if you need any information. + --- + ProblemType: Bug + AlsaDevices: Error: command ['ls', '-l', '/dev/snd/'] failed with exit code 2: ls: cannot access '/dev/snd/': No such file or directory + AplayDevices: Error: [Errno 2] No such file or directory: 'aplay': 'aplay' + ApportVersion: 2.20.9-0ubuntu7.3 + Architecture: amd64 + ArecordDevices: Error: [Errno 2] No such file or directory: 'arecord': 'arecord' + CRDA: N/A + DistroRelease: Ubuntu 18.04 + Ec2AMI: ami-91caece9 + Ec2AMIManifest: (unknown) + Ec2AvailabilityZone: us-west-2b + Ec2InstanceType: m5.xlarge + Ec2Kernel: unavailable + Ec2Ramdisk: unavailable + IwConfig: Error: [Errno 2] No such file or directory: 'iwconfig': 'iwconfig' + Lsusb: Error: command ['lsusb'] failed with exit code 1: + MachineType: Amazon EC2 m5.xlarge + Package: systemd 237-3ubuntu10.3 + PackageArchitecture: amd64 + PciMultimedia: + + ProcEnviron: + TERM=xterm-256color + PATH=(custom, no user) + XDG_RUNTIME_DIR=<set> + LANG=C.UTF-8 + SHELL=/bin/bash + ProcFB: + + ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.15.0-1021-aws root=UUID=a4278387-5a07-46eb-a726-ae1e22673af4 ro console=tty1 console=ttyS0 nvme.io_timeout=4294967295 + ProcVersionSignature: Ubuntu 4.15.0-1021.21-aws 4.15.18 + RelatedPackageVersions: + linux-restricted-modules-4.15.0-1021-aws N/A + linux-backports-modules-4.15.0-1021-aws N/A + linux-firmware N/A + RfKill: Error: [Errno 2] No such file or directory: 'rfkill': 'rfkill' + Tags: bionic ec2-images + Uname: Linux 4.15.0-1021-aws x86_64 + UpgradeStatus: No upgrade log present (probably fresh install) + UserGroups: docker + WifiSyslog: + + _MarkForUpload: True + dmi.bios.date: 10/16/2017 + dmi.bios.vendor: Amazon EC2 + dmi.bios.version: 1.0 + dmi.board.asset.tag: i-02cfe7fcd8a997085 + dmi.board.vendor: Amazon EC2 + dmi.chassis.asset.tag: Amazon EC2 + dmi.chassis.type: 1 + dmi.chassis.vendor: Amazon EC2 + dmi.modalias: dmi:bvnAmazonEC2:bvr1.0:bd10/16/2017:svnAmazonEC2:pnm5.xlarge:pvr:rvnAmazonEC2:rn:rvr:cvnAmazonEC2:ct1:cvr: + dmi.product.name: m5.xlarge + dmi.sys.vendor: Amazon EC2 ** Attachment added: "AudioDevicesInUse.txt" https://bugs.launchpad.net/bugs/1794169/+attachment/5193221/+files/AudioDevicesInUse.txt -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1794169 Title: AWS ubuntu became unreachable after ssh login To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1794169/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
