ok, i've bisected it, and the bad commit is:
3dc43e3e4d0b52197d3205214fe8f162f9e0c334 is the first bad commit
commit 3dc43e3e4d0b52197d3205214fe8f162f9e0c334
Author: Glauber Costa [off-list ref]
Date: Sun Dec 11 21:47:05 2011 +0000
per-netns ipv4 sysctl_tcp_mem
This patch allows each namespace to independently set up
its levels for tcp memory pressure thresholds. This patch
alone does not buy much: we need to make this values
per group of process somehow. This is achieved in the
patches that follows in this patchset.
Signed-off-by: Glauber Costa [off-list ref]
Reviewed-by: KAMEZAWA Hiroyuki [off-list ref]
CC: David S. Miller [off-list ref]
CC: Eric W. Biederman [off-list ref]
Signed-off-by: David S. Miller [off-list ref]
Thanks,
Ingo