[Bug 1464442] Re: installing or upgrading libc6 in Trusty removes all content from /tmp directory

[Larry Michel]

I was only able to recreate in curtin environment which has overlay
root:

$ mount
overlayroot on / type overlayfs (rw,lowerdir=/media/root-ro/,upperdir=/media/root-rw/overlay)
proc on /proc type proc (rw,noexec,nosuid,nodev)
sysfs on /sys type sysfs (rw,noexec,nosuid,nodev)
none on /sys/fs/cgroup type tmpfs (rw)
none on /sys/fs/fuse/connections type fusectl (rw)
none on /sys/kernel/debug type debugfs (rw)
none on /sys/kernel/security type securityfs (rw)
udev on /dev type devtmpfs (rw,mode=0755)
devpts on /dev/pts type devpts (rw,noexec,nosuid,gid=5,mode=0620)
tmpfs on /run type tmpfs (rw,noexec,nosuid,size=10%,mode=0755)
none on /run/lock type tmpfs (rw,noexec,nosuid,nodev,size=5242880)
none on /run/shm type tmpfs (rw,nosuid,nodev)
none on /run/user type tmpfs (rw,noexec,nosuid,nodev,size=104857600,mode=0755)
none on /sys/fs/pstore type pstore (rw)
/dev/sdf on /media/root-ro type ext4 (ro)
tmpfs-root on /media/root-rw type tmpfs (rw,relatime)
systemd on /sys/fs/cgroup/systemd type cgroup (rw,noexec,nosuid,nodev,relatime,name=systemd)


Attached are process_dump files for strace -o process_dump -ff apt-get install libc6

** Attachment added: "strace_process_dump_ff_files.tar.gz"
   https://bugs.launchpad.net/ubuntu/+source/eglibc/+bug/1464442/+attachment/4413545/+files/strace_process_dump_ff_files.tar.gz

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https://bugs.launchpad.net/bugs/1464442

Title:
  installing or upgrading libc6 in Trusty removes all content from /tmp
  directory

Status in eglibc package in Ubuntu:
  New

Bug description:
  We are seeing an issue with installation of dkms package during a
  curtin installation which ends up with /tmp directory being wiped
  clean. This is very bad for curtin as it saves critical installation
  files in /tmp.

  It turns out that it's the of upgrading libc6, which is triggered as a
  result of installing dependencies, that removes content of /tmp. For
  example, installation of gcc results in the same result since it ends
  up with libc6 being upgraded. The only way that this won't be
  recreated is if the latest libc6 is already installed.

  This problem does not exist in precise. It can also be recreated by
  installing the .deb file for any version in trusty including 2.17.

  ========================================================================
  ubuntu at host:~$ ls /tmp
  tmpHHbRkP
  ubuntu at sirrush:~$ sudo apt-get install libc6
  sudo: unable to resolve host sirrush
  Reading package lists... Done
  Building dependency tree
  Reading state information... Done
  The following extra packages will be installed:
    libc-dev-bin libc6-dev
  Suggested packages:
    glibc-doc
  Recommended packages:
    manpages-dev
  The following packages will be upgraded:
    libc-dev-bin libc6 libc6-dev
  3 upgraded, 0 newly installed, 0 to remove and 148 not upgraded.
  Need to get 6,714 kB of archives.
  After this operation, 6,144 B disk space will be freed.
  Do you want to continue? [Y/n] y
  Get:1 http://archive.ubuntu.com/ubuntu/ trusty-updates/main libc6-dev amd64 2.19-0ubuntu6.6 [1,910 kB]
  Get:2 http://archive.ubuntu.com/ubuntu/ trusty-updates/main libc-dev-bin amd64 2.19-0ubuntu6.6 [68.9 kB]
  Get:3 http://archive.ubuntu.com/ubuntu/ trusty-updates/main libc6 amd64 2.19-0ubuntu6.6 [4,735 kB]
  Fetched 6,714 kB in 0s (18.5 MB/s)
  Preconfiguring packages ...
  (Reading database ... 57798 files and directories currently installed.)
  Preparing to unpack .../libc6-dev_2.19-0ubuntu6.6_amd64.deb ...
  Unpacking libc6-dev:amd64 (2.19-0ubuntu6.6) over (2.19-0ubuntu6.3) ...
  Preparing to unpack .../libc-dev-bin_2.19-0ubuntu6.6_amd64.deb ...
  Unpacking libc-dev-bin (2.19-0ubuntu6.6) over (2.19-0ubuntu6.3) ...
  Preparing to unpack .../libc6_2.19-0ubuntu6.6_amd64.deb ...
  Unpacking libc6:amd64 (2.19-0ubuntu6.6) over (2.19-0ubuntu6.3) ...
  Processing triggers for man-db (2.6.7.1-1) ...
  Setting up libc6:amd64 (2.19-0ubuntu6.6) ...
  Setting up libc-dev-bin (2.19-0ubuntu6.6) ...
  Setting up libc6-dev:amd64 (2.19-0ubuntu6.6) ...
  Processing triggers for libc-bin (2.19-0ubuntu6.3) ...
  ubuntu at host:~$ ls /tmp
  ubuntu at host:~$
  ========================================================================

  This is very recreatable.

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