[Qemu-devel] [PATCH v6 0/4] Unit test+fix for problem with QEMU handling of multiple bind()s to the same port

[Knut Omang]

This series contains:
* a unit test that exposes a race condition which causes QEMU to fail
  to find a port even when there is plenty of available ports.
* a refactor of the qemu-sockets inet_listen_saddr() function
  to better handle this situation.

Changes from v5:
* Also move setting of error from socket creation out
  into the main double for loop.
* Simplify and enhance reporting if socket creation fails:
  Only report failure to create sockets if none of the
  provided addrinfo list elements allows creation of a
  socket, otherwise report failure to find an available port.
* Further simplify if's within the for loops and make sure
  failure to recreate a socket gets distinctively reported.
* Rebased to current master.

Changes from v4:
* Move the complexity of recreating a socket and setting the error pointer
  into the main for loop, eliminating the try_bind_listen() function
  again. Cleaning up and improving error handling in the process.

Changes from v3:
* Test changes: Add missing license
  Add subtests for ipv4, ipv6 and both
  Various g_* usage improvements
* Split patch into 3 patches with two refactoring patches ahead
  of the actual fix.

Changes from v2:
* Non-trivial rebase + further abstraction
  on top of 7ad9af343c7f1c70c8015c7c519c312d8c5f9fa1
  'tests: add functional test validating ipv4/ipv6 address flag handling'

Changes from v1:
* Fix potential uninitialized variable only detected by optimize.
* Improve unexpected error detection in test-listen to give more
  details about why the test fails unexpectedly.
* Fix some line length style issues.

Thanks,
Knut

Knut Omang (4):
  tests: Add test-listen - a stress test for QEMU socket listen
  sockets: factor out a new try_bind() function
  sockets: factor out create_fast_reuse_socket
  sockets: Handle race condition between binds to the same port

 tests/Makefile.include |   2 +-
 tests/test-listen.c    | 253 ++++++++++++++++++++++++++++++++++++++++++-
 util/qemu-sockets.c    | 138 +++++++++++++++--------
 3 files changed, 345 insertions(+), 48 deletions(-)
 create mode 100644 tests/test-listen.c

base-commit: a588c4985eff363154d65aee8607d0a4601655f7
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git-series 0.9.1