I started looking into this after seeing FAIL: virnetsockettest ====================== TEST: virnetsockettest 1) Socket TCP/IPv4 Accept ... libvirt: XML-RPC error : Unable to resolve address '127.0.0.1' service '5672': Address family for hostname not supported FAILED 2) Socket TCP/IPv6 Accept ... OK 3) Socket TCP/IPv4+IPv6 Accept ... OK 4) Socket TCP/IPv4+IPv6 Accept ... OK 5) Socket UNIX Accept ... OK 6) Socket UNIX Addrs ... OK 7) Socket External Command /dev/zero ... OK 8) Socket External Command /dev/does-not-exist ... libvirt: XML-RPC error : End of file while reading data: /bin/cat: /dev/does-not-exist: No such file or directory: Input/output error OK 9) SSH test 1 ... OK 10) SSH test 2 ... OK 11) SSH test 3 ... OK 12) SSH test 4 ... libvirt: XML-RPC error : End of file while reading data: Cannot connect to host nosuchhost: Input/output error OK 13) SSH test 5 ... libvirt: XML-RPC error : End of file while reading data: : Input/output error OK 14) SSH test 6 ... OK 15) SSH test 7 ... OK during a Debian package build. Full log: https://buildd.debian.org/status/fetch.php?pkg=libvirt&arch=armel&ver=6.4.0-2&stamp=1594738948&raw=0 Just a few days ago, this issue was discussed in https://lists.debian.org/debian-devel/2020/07/msg00070.html and libvirt was mentioned explicitly as a package that could be affected by it. Reproducing the issue is quite simple: just remove all IPv4 addresses *except* the one assigned to 'lo', and you'll see it immediately. The problem seems to be that, in this configuration, virNetSocketCheckProtocols() reports that both IPv4 and IPv6 are available, but XML-RPC is apparently not happy with that. I'm pretty bad at networking, so I'm reporting this in the hope that someone else will figure it out O:-) Anyway, there's another scenario that I found while digging: if you remove *all* IPv4 addresses, *including* the one assigned to 'lo', you get a different failure. My patch addresses this last one. Andrea Bolognani (2): tests: Don't assume IPv4 connectivity is available tests: Minimize variable scope tests/virnetsockettest.c | 23 ++++++++++++++--------- 1 file changed, 14 insertions(+), 9 deletions(-) -- 2.25.4
