Attached is a small script to setup dnsmasq-tftp and ipvs to reproduce
the dnsmasq-tftp stall. The strace at the end should start showing
sendto() = EPERM errors after running the curl tftp://.../ command given
as an example from a remote host.
The exact contents of the ipvs rules don't seem to matter.
The dnsmasq-tftp stall issue appears to happen with all the ubuntu-
installer/amd64/linux versions that I've tried, with the exact block
within the TFTP stream where it stalls changing betwen different
versions but remaining consistent between runs.
With the current netboot.tar.gz it appers to happen at block 600:
d4fc2ba26cad96f4360cb36f04c26b2f50dceee9413c206431148b87e4958909
/srv/tftp/ubuntu-installer/amd64/linux
With the original ubuntu-installer netboot.tar.gz version (from sometime
early June) I've been using it happens at block 311:
bdebc6c7bbd873bf5ad2480d90c2523da49cca8da5a0f4cb40adb7d1aeafb821
/srv/tftp/lp1349768/linux
Curiously, however, testing this setup on the 3.13.0-34-generic kernel
the dmesg error ("IPv6 header not found") does NOT show up... may be
some other facters at play as well there?
** Attachment added: "minimal testcase for LP#1349768 on Ubuntu 14.04"
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1349768/+attachment/4182427/+files/lp1349768.sh
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https://bugs.launchpad.net/bugs/1349768
Title:
kernel 3.13.0-32 ipvs "IPv6 header not found" related to UDP socket
sendto() EPERM errors
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