[PATCH v2 0/3] Fix DML vs DDL race

[Vladimir Davydov <vdavydov.dev@gmail.com>]

In Vinyl a DML request may yield on disk read while still having a
pointer to the target space saved on stack. If the space is altered
during this time window, the DML request will most certainly crash
while trying to dereference the stale pointer when it resumes. The
solution is simple: abort all affected transactions whenever we delete
a space from the cache.

https://github.com/tarantool/tarantool/issues/3420
https://github.com/tarantool/tarantool/commits/dv/gh-3420-vy-abort-tx-in-ddl

Changes in v2:
 - Instead of introducing a per transaction space hash, simply remember
   the pointer to the last prepared index. Thanks to Kostja for the tip.
 - Drop the patch allowing transactions affecting only replica local
   spaces outlast a switch to read-only mode, as we can't easily
   implement it without a per transaction space hash. Anyway, it was out
   of the scope of this issue.

v1: https://www.freelists.org/post/tarantool-patches/PATCH-04-Fix-DML-vs-DDL-race

Vladimir Davydov (3):
  vinyl: make tx_manager_abort_writers_for_ddl more thorough
  vinyl: abort affected transactions when space is removed from cache
  Revert "test: skip ddl test for vinyl on travis"

 rpm/tarantool.spec             |   2 -
 src/box/blackhole.c            |   1 +
 src/box/memtx_space.c          |   1 +
 src/box/schema.cc              |   5 +-
 src/box/space.c                |   6 +++
 src/box/space.h                |  15 ++++++
 src/box/sysview.c              |   1 +
 src/box/vinyl.c                |  27 +++++++++-
 src/box/vy_point_lookup.c      |  14 ++++++
 src/box/vy_read_iterator.c     |  13 +++++
 src/box/vy_tx.c                |   8 ++-
 src/box/vy_tx.h                |  15 +++++-
 test/vinyl/ddl.skipcond        |   6 ---
 test/vinyl/errinj_ddl.result   | 110 +++++++++++++++++++++++++++++++++++++++++
 test/vinyl/errinj_ddl.test.lua |  51 +++++++++++++++++++
 15 files changed, 261 insertions(+), 14 deletions(-)
 delete mode 100644 test/vinyl/ddl.skipcond

-- 
2.11.0