SSH Connection Error when using Vagrant and Ansible

I got the following error when using Vagrant and the Ansible provisioner:

TASK [Install packages] ********************************************************
fatal: [default]: FAILED! => {"changed": false, "module_stderr": "Shared connection to 192.168.124.116 closed.\r\n", "module_stdout": "", "msg": "MODULE FAILURE\nSee stdout/stderr for the exact error", "rc": 137}

This error occured every time I tried to provision the VM with Ansible.

With using ansible.verbose = "vvvvv" in the Vagrantfile I got the following output:

--- snip ---
mux_client_read_packet: read header failed: Broken pipe\r\ndebug2: Received exit status from master 137\r\nShared connection to 192.168.124.116 closed.\r\n",
--- snip ---

Error code 137 is issued when a process is terminated externally because of its memory consumption.

When checking the kernel logs with dmesg I found the following lines:

vagrant ssh
dmesg | grep oom
[ 1158.525674] Out of memory: Killed process 2428 (dnf) total-vm:479860kB, anon-rss:352668kB, file-rss:0kB, shmem-rss:0kB, UID:0 pgtables:836kB oom_score_adj:0
[ 6304.776507] python3 invoked oom-killer: gfp_mask=0x140cca(GFP_HIGHUSER_MOVABLE|__GFP_COMP), order=0, oom_score_adj=0
[ 6304.776529]  oom_kill_process.cold+0xb/0x10
[ 6304.776637] [  pid  ]   uid  tgid total_vm      rss pgtables_bytes swapents oom_score_adj name
[ 6304.776674] oom-kill:constraint=CONSTRAINT_NONE,nodemask=(null),cpuset=/,mems_allowed=0,global_oom,task_memcg=/user.slice/user-1000.slice/session-5.scope,task=python3,pid=2879,uid=0
[ 6304.776682] Out of memory: Killed process 2879 (python3) total-vm:401128kB, anon-rss:341880kB, file-rss:0kB, shmem-rss:0kB, UID:0 pgtables:816kB oom_score_adj:

It clearly shows that the process dnf was killed because of the memory consumption.

The default Vagrant VM has 512 MB RAM. It seems that this is not enough for the Ansible provisioning.

I increased the RAM to 2048 MB and the provisioning worked without any problems.

config.vm.provider "libvirt" do |libv|
    libv.memory = "4096"
end