Galera 26.4.27#56
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Issue: - GCache::seqno_release() could release buffers at or above seqno_locked. When called seqno_release(N) with N >= seqno_locked, free_common() would mark those buffers BUFFER_RELEASED (seqno_release() -> free_common() -> BH_release()). - The subsequent malloc() calls then discarded those buffers from seqno2ptr via discard_size(), causing the IST sender's seqno_get_buffers() to throw NotFound for the missing entries. (malloc() -> discard_size() -> discard() -> pop_front()) - The joiner then received an incomplete IST stream (seqno_get_buffers() -> seqno2ptr.at() -> NotFound): "IST didn't contain all write sets, expected last: 3 last received: -1" Solution: Fixed by clamping the end to seqno_locked - 1 and breaking the outer loop once seqno_released reaches the lock boundary. This allows releasing everything below seqno_locked.
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