[PATCH 0/6] RFC: Possible fixes for bug 94 and bug 95

[David Gibson <david@gibson.dropbear.id.au>]

As discussed on IRC through the last day, here's a more polished
version of possible fixes for bug 94 (EPOLLRDHUP storm) and bug 95
(EPOLLERR storm).  Both of those were sub-problems arising while
investigating podman bug 23686.

We're pretty confident about the EPOLLRDHUP fix (bug 94, patch 1/6),
based on Stefano's testing.  I ended up rewriting Stefano's draft
patch for the EPOLLERR case (bug 95, remaining patches), because I
thought of a possibility we hadn't discussed yet: we weren't getting
an error from the socket error queue, but we might be able to get one
with the SO_ERROR getsockopt().  My examination of the kernel code
suggests that's plausible, and that if that's the case using SO_ERROR
should also clear that error condition.

Link: https://bugs.passt.top/show_bug.cgi?id=94
Link: https://bugs.passt.top/show_bug.cgi?id=95
Link: https://github.com/containers/podman/issues/23686

David Gibson (6):
  flow: Fix incorrect hash probe in flowside_lookup()
  udp: Allow UDP flows to be prematurely closed
  flow: Helpers to log details of a flow
  udp: Split socket error handling out from udp_sock_recv()
  udp: Treat errors getting errors as unrecoverable
  udp: Handle more error conditions in udp_sock_errs()

 flow.c     | 53 ++++++++++++++++++++------------
 flow.h     |  7 +++++
 udp.c      | 88 +++++++++++++++++++++++++++++++++++++++++++++---------
 udp_flow.c | 18 ++++++++++-
 udp_flow.h |  4 +++
 5 files changed, 136 insertions(+), 34 deletions(-)

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2.46.0