On Wed, 2017-03-15 at 13:36 -0700, Stephen Hemminger wrote: > > Begin forwarded message: > > Date: Wed, 15 Mar 2017 19:41:59 +0000 > From: bugzilla-dae...@bugzilla.kernel.org > To: step...@networkplumber.org > Subject: [Bug 194723] connect() to localhost stalls after 4.9 -> 4.10 upgrade > > > https://bugzilla.kernel.org/show_bug.cgi?id=194723 > > --- Comment #15 from Lutz Vieweg (l...@5t9.de) --- > At last, bisecting converged: > > git bisect start > # bad: [c470abd4fde40ea6a0846a2beab642a578c0b8cd] Linux 4.10 > git bisect bad c470abd4fde40ea6a0846a2beab642a578c0b8cd > # good: [69973b830859bc6529a7a0468ba0d80ee5117826] Linux 4.9 > git bisect good 69973b830859bc6529a7a0468ba0d80ee5117826 > # bad: [f4000cd99750065d5177555c0a805c97174d1b9f] Merge tag 'arm64-upstream' > of > git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux > git bisect bad f4000cd99750065d5177555c0a805c97174d1b9f > # bad: [7079efc9d3e7f1f7cdd34082ec58209026315057] Merge tag 'fbdev-4.10' of > git://git.kernel.org/pub/scm/linux/kernel/git/tomba/linux > git bisect bad 7079efc9d3e7f1f7cdd34082ec58209026315057 > # bad: [669bb4c58c3091cd54650e37c5f4e345dd12c564] Merge branch 'for-linus' of > git://git.kernel.org/pub/scm/linux/kernel/git/egtvedt/linux-avr32 > git bisect bad 669bb4c58c3091cd54650e37c5f4e345dd12c564 > # good: [7a8bca043cf1bb0433aa43d008b6c4de6c07d6a2] Merge branch 'sfc-tso-v2' > git bisect good 7a8bca043cf1bb0433aa43d008b6c4de6c07d6a2 > # bad: [4f4f907a6729ae9e132810711c3a05e48311a948] Merge branch 'mvneta-64bit' > git bisect bad 4f4f907a6729ae9e132810711c3a05e48311a948 > # good: [33f8a0458b2ce4546b681c5fae04427e3077a543] Merge tag > 'wireless-drivers-next-for-davem-2016-11-25' of > git://git.kernel.org/pub/scm/linux/kernel/git/kvalo/wireless-drivers-next > git bisect good 33f8a0458b2ce4546b681c5fae04427e3077a543 > # good: [80439a1704e811697ee01fd09dd95dd10790bc93] qede: Remove 'num_tc'. > git bisect good 80439a1704e811697ee01fd09dd95dd10790bc93 > # good: [5067b6020770ef7c8102f47079c9e577d175ef2c] net/mlx5e: Remove flow > encap > entry in the correct place > git bisect good 5067b6020770ef7c8102f47079c9e577d175ef2c > # bad: [7091d8c7055d7310339435ae3af2fb490a92524d] net/sched: cls_flower: Add > offload support using egress Hardware device > git bisect bad 7091d8c7055d7310339435ae3af2fb490a92524d > # good: [b14945ac3efdf5217182a344b037f96d6b0afae1] net: atarilance: use %8ph > for printing hex string > git bisect good b14945ac3efdf5217182a344b037f96d6b0afae1 > # bad: [25429d7b7dca01dc4f17205de023a30ca09390d0] tcp: allow to turn tcp > timestamp randomization off > git bisect bad 25429d7b7dca01dc4f17205de023a30ca09390d0 > # good: [1d6cff4fca4366d0529dbce170e0f33cfe213790] qed: Add iSCSI out of order > packet handling. > git bisect good 1d6cff4fca4366d0529dbce170e0f33cfe213790 > # bad: [95a22caee396cef0bb2ca8fafdd82966a49367bb] tcp: randomize tcp timestamp > offsets for each connection > git bisect bad 95a22caee396cef0bb2ca8fafdd82966a49367bb > > > So the culprit seems to be this change: > https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=95a22caee396cef0bb2ca8fafdd82966a49367bb > > "tcp: randomize tcp timestamp offsets for each connection > jiffies based timestamps allow for easy inference of number of devices > behind NAT translators and also makes tracking of hosts simpler. > > commit ceaa1fef65a7c2e ("tcp: adding a per-socket timestamp offset") > added the main infrastructure that is needed for per-connection ts > randomization, in particular writing/reading the on-wire tcp header > format takes the offset into account so rest of stack can use normal > tcp_time_stamp (jiffies). > > So only two items are left: > - add a tsoffset for request sockets > - extend the tcp isn generator to also return another 32bit number > in addition to the ISN. > > Re-use of ISN generator also means timestamps are still monotonically > increasing for same connection quadruple, i.e. PAWS will still work. > > Includes fixes from Eric Dumazet. > > Signed-off-by: Florian Westphal <f...@strlen.de> > Acked-by: Eric Dumazet <eduma...@google.com> > Acked-by: Yuchung Cheng <ych...@google.com> > Signed-off-by: David S. Miller <da...@davemloft.net> > " > > I will try to attract some attention from above mentioned people. >
Finally time to get rid of buggy tw_recycle, that apparently some distros set to one.
