Hi,

I tested the kernel and it is fixing this issue.

Verified with command: 
#for i in {0..5}; do modprobe -rv ib_ipoib; sleep 5; modprobe -v ib_ipoib; 
sleep 5; ifconfig ib0 11.135.196.7/16; sleep 5; done

uname -a:
Linux reg-l-vrt-036-007 3.19.0-23-generic #24-Ubuntu SMP Tue Jul 7 18:52:55 UTC 
2015 x86_64 x86_64 x86_64 GNU/Linux

dmegs:
[   15.208908] IPv6: ADDRCONF(NETDEV_CHANGE): eth0: link becomes ready
[  639.091197] mlx5_ib: Mellanox Connect-IB Infiniband driver v2.2-1 (Feb 2014)
[  724.788318] IPv6: ADDRCONF(NETDEV_UP): ib0: link is not ready
[  724.801980] IPv6: ADDRCONF(NETDEV_CHANGE): ib0: link becomes ready
[  772.052993] IPv6: ADDRCONF(NETDEV_UP): ib0: link is not ready
[  772.056608] IPv6: ADDRCONF(NETDEV_CHANGE): ib0: link becomes ready
[  794.909398] IPv6: ADDRCONF(NETDEV_UP): ib0: link is not ready
[  794.912980] IPv6: ADDRCONF(NETDEV_CHANGE): ib0: link becomes ready
[  810.996256] IPv6: ADDRCONF(NETDEV_UP): ib0: link is not ready
[  810.999475] IPv6: ADDRCONF(NETDEV_CHANGE): ib0: link becomes ready
[  826.182059] IPv6: ADDRCONF(NETDEV_UP): ib0: link is not ready
[  826.185445] IPv6: ADDRCONF(NETDEV_CHANGE): ib0: link becomes ready
[  843.741871] IPv6: ADDRCONF(NETDEV_UP): ib0: link is not ready
[  843.745190] IPv6: ADDRCONF(NETDEV_CHANGE): ib0: link becomes ready
[  860.196937] IPv6: ADDRCONF(NETDEV_UP): ib0: link is not ready
[  860.200349] IPv6: ADDRCONF(NETDEV_CHANGE): ib0: link becomes ready
[  879.430210] IPv6: ADDRCONF(NETDEV_UP): ib0: link is not ready
[  879.433895] IPv6: ADDRCONF(NETDEV_CHANGE): ib0: link becomes ready
[  899.534312] IPv6: ADDRCONF(NETDEV_UP): ib0: link is not ready
[  899.538097] IPv6: ADDRCONF(NETDEV_CHANGE): ib0: link becomes ready
[ 1108.823736] IPv6: ADDRCONF(NETDEV_UP): ib0: link is not ready
[ 1108.828015] IPv6: ADDRCONF(NETDEV_CHANGE): ib0: link becomes ready

Thanks,
Kamal

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https://bugs.launchpad.net/bugs/1467912

Title:
  error "ib_dealloc_pd failed" when load unload ib_ipoib module

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