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Fix UNKNOWN bug in search tree about inconsistent end state (#8214)

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* restore more aggressive pruning in search tree

* restore where we close children to be correct

* add core strengthening check

* fix recursion bug

* less strict core propagation

* old search tree version

* restore search tree patch

* remove flag

* debugging inconsistent end state with search, some changes need to be made in search tree, only backtrack should be closing nodes, I think the bug is when we do find_highest_attach for nonchronological backjumping, you might get to a point where the sibling is closed, so then we need to resolve further up the tree

* clean up code, fix deadlock

* delete test files

* clean up

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Co-authored-by: Ilana Shapiro <ilanashapiro@Mac.localdomain>
Co-authored-by: Ilana Shapiro <ilanashapiro@Ilanas-MacBook-Pro.local>
Co-authored-by: Ilana Shapiro <ilanashapiro@Ilanas-MBP.lan1>
This commit is contained in:
Ilana Shapiro 2026-01-16 10:41:13 -08:00 • committed by GitHub
parent 596cd23efc
commit b1b7270686
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2 changed files with 45 additions and 7 deletions
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src/smt/smt_parallel.cpp
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@ -276,6 +276,7 @@ namespace smt {
IF_VERBOSE(1, m_search_tree.display(verbose_stream() << bounded_pp_exprs(core) << "\n"););
if (m_search_tree.is_closed()) {
IF_VERBOSE(1, verbose_stream() << "Search tree closed, setting UNSAT\n");
m_state = state::is_unsat;
SASSERT(p.ctx.m_unsat_core.empty());
for (auto e : m_search_tree.get_core_from_root())