xfstests hang with the find command in the end

xfstests__X-hwe_i386-lowlatency__using_fozzie

The test stalled in the end, the last thing it's running is:
    cmd : 'sudo find autotest/client/results/default -type d | xargs chmod +x'
        quiet : False
        ignore_result : False
        Leave sh
        Enter sh
    cmd : 'sudo find . -name 'crash.*' -type d | xargs sudo rm -rf'
        quiet : False
        ignore_result : False

pstree -p output:
 |-sshd(1674)-+-sshd(2681)---sshd(2722)---python(2723)-+-sh(4915)-+-sudo(4917)---find(4919)
 | | | `-xargs(4918)
 | | |-{python}(2991)
 | | `-{python}(4916)

Status for the find command:
ubuntu 4915 0.0 0.0 2372 620 ? S Sep15 0:00 /bin/sh -c sudo find . -name 'crash.*' -type d | xargs sudo rm -rf
root 4917 0.0 0.0 6556 3680 ? S Sep15 0:00 sudo find . -name crash.* -type d
root 4919 0.0 0.0 5188 1132 ? D Sep15 0:00 find . -name crash.* -type d