Georgiy Lebedev

memtx: fix 'use after free' of garbage collected MVCC stories

1

`directly_replaced` stories can potentially get garbage collected in `memtx_tx_handle_gap_write`, which is unexpected and leads to 'use after free': in order to fix this, limit garbage collection points only to external...

When conflicting transactions that made full scans in `memtx_tx_handle_gap_write`, we need to also track that the conflicted transaction has read the inserted tuple, just like we do in gap tracking...

**Steps to reproduce** ```lua os.execute('rm -rf *.snap *.xlog *.vylog 512') local ffi = require('ffi') local json = require('json') local log = require('log') local txn_proxy = require('txn_proxy') box.cfg{memtx_use_mvcc_engine = true} box.schema.space.create('s')...

memtx: rework transaction rollback

1

When we rollback a transaction statement, we relink its read trackers to a newer story in the history chain, if present (6c990a7), but we do not handle the case when...

memtx: fix isolation level of BITSET and RTREE indexes

1

RTREE and BITSET indexes have inconsistent isolation levels ('read committed' instead of 'serializable', as stated): tracking reads for these indexes is quite sophisticated, so for now let's treat any index...

libunwind submodule follow-up fixes

6

After reviewing #6877, @Totktonada proposed some suggestions and fixes: - [ ] return _autotools_ to _RHEL_ and _debian_ distribution dependencies; - [ ] refactor [default _GCC_ _CentOS_ _7_ workflow](https://github.com/tarantool/tarantool/blob/master/.github/workflows/default_gcc_centos_7.yml): make...

Deprecation of 'GT' iterator type for HASH index

1

# Description _HASH_ index has a dubious 'GT' iterator type[^GT]: > The comparison operator is ‘>’ (greater than). If a hash of an index key is greater than a hash...

**Steps to reproduce** ```lua os.execute('rm -rf *.snap *.xlog *.vylog 512') local ffi = require('ffi') local json = require('json') local log = require('log') local txn_proxy = require('txn_proxy') box.cfg{memtx_use_mvcc_engine = true} local...

**Steps to reproduce** ```lua os.execute('rm -rf *.snap *.xlog *.vylog 512') local ffi = require('ffi') local json = require('json') local log = require('log') local txn_proxy = require('txn_proxy') box.cfg{memtx_use_mvcc_engine = true} local...

**Bug description** Consider the following fair assertion: ```diff diff --git a/src/box/memtx_tx.c b/src/box/memtx_tx.c index 2b858944b..362b80fbe 100644 --- a/src/box/memtx_tx.c +++ b/src/box/memtx_tx.c @@ -1234,6 +1234,7 @@ memtx_tx_story_full_unlink(struct memtx_story *story) if (story->del_psn > 0...