ip_defrag.sh in net from ubuntu_kernel_selftests ADT failure with focal/linux

[Kleber Sacilotto de Souza]

Testing failed on focal/linux 5.4.0-44.48:
    amd64: https://objectstorage.prodstack4-5.canonical.com/v1/AUTH_77e2ada1e7a84929a74ba3b87153c0ac/autopkgtest-focal/focal/amd64/l/linux/20200812_171444_31971@/log.gz
    arm64: https://objectstorage.prodstack4-5.canonical.com/v1/AUTH_77e2ada1e7a84929a74ba3b87153c0ac/autopkgtest-focal/focal/arm64/l/linux/20200812_210509_145fd@/log.gz
    ppc64el: https://objectstorage.prodstack4-5.canonical.com/v1/AUTH_77e2ada1e7a84929a74ba3b87153c0ac/autopkgtest-focal/focal/ppc64el/l/linux/20200812_165855_1dabd@/log.gz
    s390x: https://objectstorage.prodstack4-5.canonical.com/v1/AUTH_77e2ada1e7a84929a74ba3b87153c0ac/autopkgtest-focal/focal/s390x/l/linux/20200812_153600_9c7cb@/log.gz

ip_defrag.sh fails with return code 255 without any output. Commenting the "set +x" line from the script and running it we get:

$ sudo bash -x ./ip_defrag.sh
+ set -e
++ mktemp -u XXXXXX
+ readonly NETNS=ns-2Wn99i
+ NETNS=ns-2Wn99i
+ trap cleanup EXIT
+ setup
+ ip netns add ns-2Wn99i
+ ip -netns ns-2Wn99i link set lo up
+ ip netns exec ns-2Wn99i sysctl -w net.ipv4.ipfrag_high_thresh=9000000
+ ip netns exec ns-2Wn99i sysctl -w net.ipv4.ipfrag_low_thresh=7000000
+ ip netns exec ns-2Wn99i sysctl -w net.ipv4.ipfrag_time=1
+ ip netns exec ns-2Wn99i sysctl -w net.ipv6.ip6frag_high_thresh=9000000
+ ip netns exec ns-2Wn99i sysctl -w net.ipv6.ip6frag_low_thresh=7000000
+ ip netns exec ns-2Wn99i sysctl -w net.ipv6.ip6frag_time=1
+ ip netns exec ns-2Wn99i sysctl -w net.netfilter.nf_conntrack_frag6_high_thresh=9000000
+ cleanup
+ ip netns del ns-2Wn99i

Running these manually we get the following error:

$ sudo ip netns exec ns-2Wn99i sysctl -w net.netfilter.nf_conntrack_frag6_high_thresh=9000000
sysctl: cannot stat /proc/sys/net/netfilter/nf_conntrack_frag6_high_thresh: No such file or directory

This happens because this step needs the 'nf_defrag_ipv6' module to be loaded.

This has always failed like this with the ADT tests but not always with our Regression Tests. I suspect that on Regression Tests there might be another testcase that's run before it that loads this module.

[Ubuntu Kernel Bot (ubuntu-kernel-bot)]

This bug is missing log files that will aid in diagnosing the problem. While running an Ubuntu kernel (not a mainline or third-party kernel) please enter the following command in a terminal window:

apport-collect 1892070

and then change the status of the bug to 'Confirmed'.

If, due to the nature of the issue you have encountered, you are unable to run this command, please add a comment stating that fact and change the bug status to 'Confirmed'.

This change has been made by an automated script, maintained by the Ubuntu Kernel Team.

[Po-Hsu Lin (cypressyew)]

Patch applied in Focal kernel
625247c91d94 ("selftests: net: ip_defrag: modprobe missing nf_defrag_ipv6 support")
$ git tag --contain 625247c91d9453d24ff035ee5bfcf34375208782
Ubuntu-5.4.0-46.50

[Po-Hsu Lin (cypressyew)]

Need to check if this is still failing on B-hwe-5.3, looks like this is affected.

[Po-Hsu Lin (cypressyew)]

As 5.3 does not exist anymore, I am going to close this bug.