/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample FPandBPonlyIfFpWasNotPerfect -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.assert.codeblocks SMT_FEATURE_HEURISTIC --traceabstraction.assert.codeblocks.term.scoring.heuristic BIGGEST_EQUIVALENCE_CLASS --traceabstraction.assert.codeblocks.term.scoring.heuristic.partitioning.strategy FIXED_NUM_PARTITIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.number.of.partitions 4 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loop-lit/jm2006_variant.i -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-21 23:25:37,506 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-21 23:25:37,510 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-21 23:25:37,527 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-21 23:25:37,528 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-21 23:25:37,529 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-21 23:25:37,532 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-21 23:25:37,534 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-21 23:25:37,537 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-21 23:25:37,538 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-21 23:25:37,540 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-21 23:25:37,542 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-21 23:25:37,542 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-21 23:25:37,544 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-21 23:25:37,545 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-21 23:25:37,547 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-21 23:25:37,549 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-21 23:25:37,550 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-21 23:25:37,553 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-21 23:25:37,556 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-21 23:25:37,558 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-21 23:25:37,560 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-21 23:25:37,561 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-21 23:25:37,563 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-21 23:25:37,567 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-21 23:25:37,579 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-21 23:25:37,580 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-21 23:25:37,582 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-21 23:25:37,583 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-07-21 23:25:37,601 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-21 23:25:37,602 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-21 23:25:37,604 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-21 23:25:37,604 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-21 23:25:37,605 INFO L138 SettingsManager]: * Use SBE=true [2020-07-21 23:25:37,605 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-21 23:25:37,605 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-21 23:25:37,605 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-21 23:25:37,606 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-21 23:25:37,606 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-21 23:25:37,606 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-21 23:25:37,606 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-21 23:25:37,607 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-21 23:25:37,607 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-21 23:25:37,607 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-21 23:25:37,607 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-21 23:25:37,608 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-21 23:25:37,608 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-21 23:25:37,608 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-21 23:25:37,608 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-21 23:25:37,609 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-21 23:25:37,609 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 23:25:37,609 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-21 23:25:37,610 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-21 23:25:37,610 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-21 23:25:37,610 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-21 23:25:37,610 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:25:37,611 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-21 23:25:37,611 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-21 23:25:37,611 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> FPandBPonlyIfFpWasNotPerfect Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks -> SMT_FEATURE_HEURISTIC Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic -> BIGGEST_EQUIVALENCE_CLASS Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic Partitioning Strategy -> FIXED_NUM_PARTITIONS Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic number of partitions -> 4 [2020-07-21 23:25:38,025 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-21 23:25:38,043 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-21 23:25:38,048 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-21 23:25:38,051 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-21 23:25:38,051 INFO L275 PluginConnector]: CDTParser initialized [2020-07-21 23:25:38,052 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-lit/jm2006_variant.i [2020-07-21 23:25:38,164 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/e8ec508e6/546891a63ea346ae937d3c79d63cd5c2/FLAG43fb86835 [2020-07-21 23:25:38,819 INFO L306 CDTParser]: Found 1 translation units. [2020-07-21 23:25:38,820 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-lit/jm2006_variant.i [2020-07-21 23:25:38,829 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/e8ec508e6/546891a63ea346ae937d3c79d63cd5c2/FLAG43fb86835 [2020-07-21 23:25:39,169 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/e8ec508e6/546891a63ea346ae937d3c79d63cd5c2 [2020-07-21 23:25:39,188 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-21 23:25:39,192 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-21 23:25:39,194 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-21 23:25:39,194 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-21 23:25:39,199 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-21 23:25:39,201 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 11:25:39" (1/1) ... [2020-07-21 23:25:39,206 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@1460d30c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:25:39, skipping insertion in model container [2020-07-21 23:25:39,207 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 11:25:39" (1/1) ... [2020-07-21 23:25:39,218 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-21 23:25:39,244 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-21 23:25:39,449 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 23:25:39,457 INFO L203 MainTranslator]: Completed pre-run [2020-07-21 23:25:39,479 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 23:25:39,502 INFO L208 MainTranslator]: Completed translation [2020-07-21 23:25:39,503 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:25:39 WrapperNode [2020-07-21 23:25:39,503 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-21 23:25:39,504 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-21 23:25:39,504 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-21 23:25:39,505 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-21 23:25:39,525 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:25:39" (1/1) ... [2020-07-21 23:25:39,526 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:25:39" (1/1) ... [2020-07-21 23:25:39,534 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:25:39" (1/1) ... [2020-07-21 23:25:39,535 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:25:39" (1/1) ... [2020-07-21 23:25:39,541 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:25:39" (1/1) ... [2020-07-21 23:25:39,549 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:25:39" (1/1) ... [2020-07-21 23:25:39,551 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:25:39" (1/1) ... [2020-07-21 23:25:39,553 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-21 23:25:39,554 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-21 23:25:39,555 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-21 23:25:39,555 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-21 23:25:39,557 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:25:39" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 23:25:39,766 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-21 23:25:39,767 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-21 23:25:39,767 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2020-07-21 23:25:39,767 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-07-21 23:25:39,767 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-21 23:25:39,767 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-21 23:25:39,768 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-07-21 23:25:39,768 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2020-07-21 23:25:39,768 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-07-21 23:25:39,768 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-21 23:25:39,768 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-21 23:25:39,769 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-21 23:25:39,769 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-21 23:25:40,047 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-21 23:25:40,048 INFO L295 CfgBuilder]: Removed 1 assume(true) statements. [2020-07-21 23:25:40,055 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 11:25:40 BoogieIcfgContainer [2020-07-21 23:25:40,057 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-21 23:25:40,058 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-21 23:25:40,059 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-21 23:25:40,064 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-21 23:25:40,065 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.07 11:25:39" (1/3) ... [2020-07-21 23:25:40,066 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@161ec8fa and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 11:25:40, skipping insertion in model container [2020-07-21 23:25:40,067 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:25:39" (2/3) ... [2020-07-21 23:25:40,067 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@161ec8fa and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 11:25:40, skipping insertion in model container [2020-07-21 23:25:40,067 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 11:25:40" (3/3) ... [2020-07-21 23:25:40,070 INFO L109 eAbstractionObserver]: Analyzing ICFG jm2006_variant.i [2020-07-21 23:25:40,096 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-21 23:25:40,112 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-21 23:25:40,148 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-21 23:25:40,211 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-21 23:25:40,211 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-21 23:25:40,212 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-21 23:25:40,212 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-21 23:25:40,212 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-21 23:25:40,213 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-21 23:25:40,213 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-21 23:25:40,213 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-21 23:25:40,260 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states. [2020-07-21 23:25:40,271 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-07-21 23:25:40,272 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:25:40,273 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:25:40,274 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:25:40,283 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:25:40,284 INFO L82 PathProgramCache]: Analyzing trace with hash -362650722, now seen corresponding path program 1 times [2020-07-21 23:25:40,307 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:25:40,308 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1638104111] [2020-07-21 23:25:40,309 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:25:40,411 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-21 23:25:40,412 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:25:40,416 INFO L263 TraceCheckSpWp]: Trace formula consists of 39 conjuncts, 11 conjunts are in the unsatisfiable core [2020-07-21 23:25:40,423 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:25:40,574 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 3 disjuncts [2020-07-21 23:25:40,630 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 23:25:40,631 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 23:25:40,634 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1638104111] [2020-07-21 23:25:40,635 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 23:25:40,636 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2020-07-21 23:25:40,637 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1574823467] [2020-07-21 23:25:40,643 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-07-21 23:25:40,644 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:25:40,656 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-07-21 23:25:40,658 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2020-07-21 23:25:40,660 INFO L87 Difference]: Start difference. First operand 21 states. Second operand 7 states. [2020-07-21 23:25:40,945 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:25:40,946 INFO L93 Difference]: Finished difference Result 47 states and 59 transitions. [2020-07-21 23:25:40,947 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-21 23:25:40,949 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 13 [2020-07-21 23:25:40,951 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:25:40,965 INFO L225 Difference]: With dead ends: 47 [2020-07-21 23:25:40,966 INFO L226 Difference]: Without dead ends: 15 [2020-07-21 23:25:40,973 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=25, Invalid=65, Unknown=0, NotChecked=0, Total=90 [2020-07-21 23:25:41,005 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2020-07-21 23:25:41,034 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2020-07-21 23:25:41,036 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2020-07-21 23:25:41,038 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 15 transitions. [2020-07-21 23:25:41,041 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 15 transitions. Word has length 13 [2020-07-21 23:25:41,042 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:25:41,042 INFO L479 AbstractCegarLoop]: Abstraction has 15 states and 15 transitions. [2020-07-21 23:25:41,042 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-07-21 23:25:41,042 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 15 transitions. [2020-07-21 23:25:41,043 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-07-21 23:25:41,044 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:25:41,044 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:25:41,258 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:25:41,258 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:25:41,259 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:25:41,259 INFO L82 PathProgramCache]: Analyzing trace with hash -1126137131, now seen corresponding path program 1 times [2020-07-21 23:25:41,260 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:25:41,261 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [412503077] [2020-07-21 23:25:41,262 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:25:41,304 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 23:25:41,304 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:25:41,306 INFO L263 TraceCheckSpWp]: Trace formula consists of 47 conjuncts, 19 conjunts are in the unsatisfiable core [2020-07-21 23:25:41,309 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:25:41,421 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 23:25:41,421 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 23:25:41,455 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 23:25:41,606 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 23:25:41,607 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [412503077] [2020-07-21 23:25:41,608 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 23:25:41,609 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 12 [2020-07-21 23:25:41,609 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1395966742] [2020-07-21 23:25:41,612 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-21 23:25:41,612 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:25:41,613 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-21 23:25:41,613 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=99, Unknown=0, NotChecked=0, Total=132 [2020-07-21 23:25:41,614 INFO L87 Difference]: Start difference. First operand 15 states and 15 transitions. Second operand 12 states. [2020-07-21 23:25:41,997 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:25:41,998 INFO L93 Difference]: Finished difference Result 26 states and 28 transitions. [2020-07-21 23:25:41,998 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-21 23:25:41,999 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 14 [2020-07-21 23:25:41,999 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:25:42,000 INFO L225 Difference]: With dead ends: 26 [2020-07-21 23:25:42,001 INFO L226 Difference]: Without dead ends: 18 [2020-07-21 23:25:42,003 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 15 SyntacticMatches, 2 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=79, Invalid=227, Unknown=0, NotChecked=0, Total=306 [2020-07-21 23:25:42,004 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2020-07-21 23:25:42,009 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2020-07-21 23:25:42,010 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2020-07-21 23:25:42,011 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 18 transitions. [2020-07-21 23:25:42,011 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 18 transitions. Word has length 14 [2020-07-21 23:25:42,012 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:25:42,012 INFO L479 AbstractCegarLoop]: Abstraction has 18 states and 18 transitions. [2020-07-21 23:25:42,012 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-21 23:25:42,012 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 18 transitions. [2020-07-21 23:25:42,013 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2020-07-21 23:25:42,013 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:25:42,014 INFO L422 BasicCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:25:42,228 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:25:42,228 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:25:42,229 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:25:42,229 INFO L82 PathProgramCache]: Analyzing trace with hash -1467221666, now seen corresponding path program 2 times [2020-07-21 23:25:42,229 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:25:42,229 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [678800494] [2020-07-21 23:25:42,230 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:25:42,266 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 23:25:42,267 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:25:42,269 WARN L261 TraceCheckSpWp]: Trace formula consists of 68 conjuncts, 37 conjunts are in the unsatisfiable core [2020-07-21 23:25:42,271 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:25:42,443 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 23:25:42,443 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 23:25:42,493 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 23:25:42,758 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 23:25:42,759 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [678800494] [2020-07-21 23:25:42,760 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 23:25:42,760 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2020-07-21 23:25:42,760 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [637889570] [2020-07-21 23:25:42,761 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-07-21 23:25:42,762 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:25:42,762 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-07-21 23:25:42,763 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=66, Invalid=240, Unknown=0, NotChecked=0, Total=306 [2020-07-21 23:25:42,763 INFO L87 Difference]: Start difference. First operand 18 states and 18 transitions. Second operand 18 states. [2020-07-21 23:25:43,631 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:25:43,632 INFO L93 Difference]: Finished difference Result 32 states and 37 transitions. [2020-07-21 23:25:43,632 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-07-21 23:25:43,632 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 17 [2020-07-21 23:25:43,633 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:25:43,634 INFO L225 Difference]: With dead ends: 32 [2020-07-21 23:25:43,634 INFO L226 Difference]: Without dead ends: 24 [2020-07-21 23:25:43,635 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 15 SyntacticMatches, 2 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 69 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=194, Invalid=562, Unknown=0, NotChecked=0, Total=756 [2020-07-21 23:25:43,636 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2020-07-21 23:25:43,642 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2020-07-21 23:25:43,643 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2020-07-21 23:25:43,644 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 24 transitions. [2020-07-21 23:25:43,644 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 24 transitions. Word has length 17 [2020-07-21 23:25:43,644 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:25:43,645 INFO L479 AbstractCegarLoop]: Abstraction has 24 states and 24 transitions. [2020-07-21 23:25:43,645 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-07-21 23:25:43,645 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 24 transitions. [2020-07-21 23:25:43,646 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2020-07-21 23:25:43,646 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:25:43,646 INFO L422 BasicCegarLoop]: trace histogram [10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:25:43,861 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:25:43,862 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:25:43,862 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:25:43,863 INFO L82 PathProgramCache]: Analyzing trace with hash 2094249470, now seen corresponding path program 3 times [2020-07-21 23:25:43,863 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:25:43,864 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [324187550] [2020-07-21 23:25:43,864 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:25:43,931 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 23:25:43,931 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:25:43,934 WARN L261 TraceCheckSpWp]: Trace formula consists of 110 conjuncts, 73 conjunts are in the unsatisfiable core [2020-07-21 23:25:43,943 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:25:44,340 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 23:25:44,341 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 23:25:44,405 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 23:25:45,093 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 23:25:45,094 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [324187550] [2020-07-21 23:25:45,094 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 23:25:45,095 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17] total 30 [2020-07-21 23:25:45,095 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1918962516] [2020-07-21 23:25:45,096 INFO L459 AbstractCegarLoop]: Interpolant automaton has 30 states [2020-07-21 23:25:45,096 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:25:45,097 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2020-07-21 23:25:45,100 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=186, Invalid=684, Unknown=0, NotChecked=0, Total=870 [2020-07-21 23:25:45,101 INFO L87 Difference]: Start difference. First operand 24 states and 24 transitions. Second operand 30 states. [2020-07-21 23:25:45,820 WARN L193 SmtUtils]: Spent 150.00 ms on a formula simplification. DAG size of input: 62 DAG size of output: 52 [2020-07-21 23:25:46,145 WARN L193 SmtUtils]: Spent 117.00 ms on a formula simplification. DAG size of input: 61 DAG size of output: 51 [2020-07-21 23:25:47,223 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:25:47,224 INFO L93 Difference]: Finished difference Result 44 states and 55 transitions. [2020-07-21 23:25:47,224 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2020-07-21 23:25:47,225 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 23 [2020-07-21 23:25:47,225 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:25:47,226 INFO L225 Difference]: With dead ends: 44 [2020-07-21 23:25:47,226 INFO L226 Difference]: Without dead ends: 36 [2020-07-21 23:25:47,228 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 15 SyntacticMatches, 2 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 186 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=566, Invalid=1504, Unknown=0, NotChecked=0, Total=2070 [2020-07-21 23:25:47,230 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2020-07-21 23:25:47,239 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2020-07-21 23:25:47,239 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-07-21 23:25:47,240 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 36 transitions. [2020-07-21 23:25:47,241 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 36 transitions. Word has length 23 [2020-07-21 23:25:47,241 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:25:47,242 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 36 transitions. [2020-07-21 23:25:47,242 INFO L480 AbstractCegarLoop]: Interpolant automaton has 30 states. [2020-07-21 23:25:47,242 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 36 transitions. [2020-07-21 23:25:47,243 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2020-07-21 23:25:47,244 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:25:47,244 INFO L422 BasicCegarLoop]: trace histogram [22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:25:47,459 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:25:47,460 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:25:47,460 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:25:47,460 INFO L82 PathProgramCache]: Analyzing trace with hash -810203330, now seen corresponding path program 4 times [2020-07-21 23:25:47,460 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:25:47,461 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1725609320] [2020-07-21 23:25:47,461 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:25:47,549 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 23:25:47,550 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:25:47,553 WARN L261 TraceCheckSpWp]: Trace formula consists of 194 conjuncts, 145 conjunts are in the unsatisfiable core [2020-07-21 23:25:47,557 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:25:48,491 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 23:25:48,492 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 23:25:48,579 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 23:25:50,417 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 23:25:50,418 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1725609320] [2020-07-21 23:25:50,418 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 23:25:50,418 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 29] total 54 [2020-07-21 23:25:50,419 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [743606555] [2020-07-21 23:25:50,419 INFO L459 AbstractCegarLoop]: Interpolant automaton has 54 states [2020-07-21 23:25:50,420 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:25:50,421 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 54 interpolants. [2020-07-21 23:25:50,422 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=642, Invalid=2220, Unknown=0, NotChecked=0, Total=2862 [2020-07-21 23:25:50,423 INFO L87 Difference]: Start difference. First operand 36 states and 36 transitions. Second operand 54 states. [2020-07-21 23:25:51,624 WARN L193 SmtUtils]: Spent 231.00 ms on a formula simplification that was a NOOP. DAG size: 124 [2020-07-21 23:25:52,069 WARN L193 SmtUtils]: Spent 313.00 ms on a formula simplification. DAG size of input: 122 DAG size of output: 100 [2020-07-21 23:25:52,481 WARN L193 SmtUtils]: Spent 195.00 ms on a formula simplification that was a NOOP. DAG size: 119 [2020-07-21 23:25:52,874 WARN L193 SmtUtils]: Spent 303.00 ms on a formula simplification. DAG size of input: 121 DAG size of output: 99 [2020-07-21 23:25:53,312 WARN L193 SmtUtils]: Spent 218.00 ms on a formula simplification that was a NOOP. DAG size: 114 [2020-07-21 23:25:53,773 WARN L193 SmtUtils]: Spent 173.00 ms on a formula simplification that was a NOOP. DAG size: 109 [2020-07-21 23:25:54,146 WARN L193 SmtUtils]: Spent 163.00 ms on a formula simplification that was a NOOP. DAG size: 104 [2020-07-21 23:25:54,523 WARN L193 SmtUtils]: Spent 153.00 ms on a formula simplification that was a NOOP. DAG size: 99 [2020-07-21 23:25:54,863 WARN L193 SmtUtils]: Spent 144.00 ms on a formula simplification that was a NOOP. DAG size: 94 [2020-07-21 23:25:55,183 WARN L193 SmtUtils]: Spent 129.00 ms on a formula simplification that was a NOOP. DAG size: 89 [2020-07-21 23:25:55,509 WARN L193 SmtUtils]: Spent 136.00 ms on a formula simplification that was a NOOP. DAG size: 84 [2020-07-21 23:25:55,830 WARN L193 SmtUtils]: Spent 114.00 ms on a formula simplification that was a NOOP. DAG size: 79 [2020-07-21 23:25:56,127 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 74 [2020-07-21 23:25:58,985 WARN L193 SmtUtils]: Spent 211.00 ms on a formula simplification that was a NOOP. DAG size: 119 [2020-07-21 23:25:59,007 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:25:59,007 INFO L93 Difference]: Finished difference Result 68 states and 91 transitions. [2020-07-21 23:25:59,013 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 55 states. [2020-07-21 23:25:59,014 INFO L78 Accepts]: Start accepts. Automaton has 54 states. Word has length 35 [2020-07-21 23:25:59,015 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:25:59,016 INFO L225 Difference]: With dead ends: 68 [2020-07-21 23:25:59,016 INFO L226 Difference]: Without dead ends: 60 [2020-07-21 23:25:59,022 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 97 GetRequests, 15 SyntacticMatches, 2 SemanticMatches, 80 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 528 ImplicationChecksByTransitivity, 10.1s TimeCoverageRelationStatistics Valid=1958, Invalid=4684, Unknown=0, NotChecked=0, Total=6642 [2020-07-21 23:25:59,023 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2020-07-21 23:25:59,061 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 60. [2020-07-21 23:25:59,062 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 60 states. [2020-07-21 23:25:59,066 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 60 transitions. [2020-07-21 23:25:59,066 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 60 transitions. Word has length 35 [2020-07-21 23:25:59,067 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:25:59,067 INFO L479 AbstractCegarLoop]: Abstraction has 60 states and 60 transitions. [2020-07-21 23:25:59,067 INFO L480 AbstractCegarLoop]: Interpolant automaton has 54 states. [2020-07-21 23:25:59,078 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 60 transitions. [2020-07-21 23:25:59,081 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2020-07-21 23:25:59,082 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:25:59,082 INFO L422 BasicCegarLoop]: trace histogram [46, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:25:59,299 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:25:59,299 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:25:59,300 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:25:59,301 INFO L82 PathProgramCache]: Analyzing trace with hash 404277694, now seen corresponding path program 5 times [2020-07-21 23:25:59,301 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:25:59,302 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1095411482] [2020-07-21 23:25:59,302 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:25:59,428 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 23:25:59,429 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:25:59,434 WARN L261 TraceCheckSpWp]: Trace formula consists of 362 conjuncts, 289 conjunts are in the unsatisfiable core [2020-07-21 23:25:59,441 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:26:02,679 INFO L134 CoverageAnalysis]: Checked inductivity of 1081 backedges. 0 proven. 1081 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 23:26:02,679 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 23:26:02,947 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 23:26:11,023 INFO L134 CoverageAnalysis]: Checked inductivity of 1081 backedges. 0 proven. 1081 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 23:26:11,024 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1095411482] [2020-07-21 23:26:11,024 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 23:26:11,025 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [53, 53] total 102 [2020-07-21 23:26:11,025 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1121167266] [2020-07-21 23:26:11,026 INFO L459 AbstractCegarLoop]: Interpolant automaton has 102 states [2020-07-21 23:26:11,026 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:26:11,027 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 102 interpolants. [2020-07-21 23:26:11,031 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2418, Invalid=7884, Unknown=0, NotChecked=0, Total=10302 [2020-07-21 23:26:11,031 INFO L87 Difference]: Start difference. First operand 60 states and 60 transitions. Second operand 102 states. [2020-07-21 23:26:15,837 WARN L193 SmtUtils]: Spent 674.00 ms on a formula simplification that was a NOOP. DAG size: 244 [2020-07-21 23:26:17,289 WARN L193 SmtUtils]: Spent 995.00 ms on a formula simplification. DAG size of input: 242 DAG size of output: 196 [2020-07-21 23:26:19,042 WARN L193 SmtUtils]: Spent 666.00 ms on a formula simplification that was a NOOP. DAG size: 239 [2020-07-21 23:26:20,201 WARN L193 SmtUtils]: Spent 910.00 ms on a formula simplification. DAG size of input: 241 DAG size of output: 195 [2020-07-21 23:26:21,917 WARN L193 SmtUtils]: Spent 683.00 ms on a formula simplification that was a NOOP. DAG size: 234 [2020-07-21 23:26:23,811 WARN L193 SmtUtils]: Spent 660.00 ms on a formula simplification that was a NOOP. DAG size: 229 [2020-07-21 23:26:25,511 WARN L193 SmtUtils]: Spent 640.00 ms on a formula simplification that was a NOOP. DAG size: 224 [2020-07-21 23:26:27,207 WARN L193 SmtUtils]: Spent 624.00 ms on a formula simplification that was a NOOP. DAG size: 219 [2020-07-21 23:26:28,838 WARN L193 SmtUtils]: Spent 612.00 ms on a formula simplification that was a NOOP. DAG size: 214 [2020-07-21 23:26:30,458 WARN L193 SmtUtils]: Spent 590.00 ms on a formula simplification that was a NOOP. DAG size: 209 [2020-07-21 23:26:32,060 WARN L193 SmtUtils]: Spent 576.00 ms on a formula simplification that was a NOOP. DAG size: 204 [2020-07-21 23:26:33,633 WARN L193 SmtUtils]: Spent 580.00 ms on a formula simplification that was a NOOP. DAG size: 199 [2020-07-21 23:26:35,178 WARN L193 SmtUtils]: Spent 545.00 ms on a formula simplification that was a NOOP. DAG size: 194 [2020-07-21 23:26:36,716 WARN L193 SmtUtils]: Spent 555.00 ms on a formula simplification that was a NOOP. DAG size: 189 [2020-07-21 23:26:38,217 WARN L193 SmtUtils]: Spent 549.00 ms on a formula simplification that was a NOOP. DAG size: 184 [2020-07-21 23:26:39,523 WARN L193 SmtUtils]: Spent 416.00 ms on a formula simplification that was a NOOP. DAG size: 179 [2020-07-21 23:26:40,913 WARN L193 SmtUtils]: Spent 485.00 ms on a formula simplification that was a NOOP. DAG size: 174 [2020-07-21 23:26:42,298 WARN L193 SmtUtils]: Spent 465.00 ms on a formula simplification that was a NOOP. DAG size: 169 [2020-07-21 23:26:43,642 WARN L193 SmtUtils]: Spent 454.00 ms on a formula simplification that was a NOOP. DAG size: 164 [2020-07-21 23:26:45,010 WARN L193 SmtUtils]: Spent 476.00 ms on a formula simplification that was a NOOP. DAG size: 159 [2020-07-21 23:26:46,314 WARN L193 SmtUtils]: Spent 433.00 ms on a formula simplification that was a NOOP. DAG size: 154 [2020-07-21 23:26:47,632 WARN L193 SmtUtils]: Spent 405.00 ms on a formula simplification that was a NOOP. DAG size: 149 [2020-07-21 23:26:48,884 WARN L193 SmtUtils]: Spent 398.00 ms on a formula simplification that was a NOOP. DAG size: 144 [2020-07-21 23:26:50,087 WARN L193 SmtUtils]: Spent 357.00 ms on a formula simplification that was a NOOP. DAG size: 139 [2020-07-21 23:26:51,292 WARN L193 SmtUtils]: Spent 375.00 ms on a formula simplification that was a NOOP. DAG size: 134 [2020-07-21 23:26:52,385 WARN L193 SmtUtils]: Spent 233.00 ms on a formula simplification that was a NOOP. DAG size: 129 [2020-07-21 23:26:53,510 WARN L193 SmtUtils]: Spent 376.00 ms on a formula simplification that was a NOOP. DAG size: 124 [2020-07-21 23:26:54,661 WARN L193 SmtUtils]: Spent 330.00 ms on a formula simplification that was a NOOP. DAG size: 119 [2020-07-21 23:26:55,787 WARN L193 SmtUtils]: Spent 300.00 ms on a formula simplification that was a NOOP. DAG size: 114 [2020-07-21 23:26:56,934 WARN L193 SmtUtils]: Spent 313.00 ms on a formula simplification that was a NOOP. DAG size: 109 [2020-07-21 23:26:57,983 WARN L193 SmtUtils]: Spent 290.00 ms on a formula simplification that was a NOOP. DAG size: 104 [2020-07-21 23:26:59,004 WARN L193 SmtUtils]: Spent 250.00 ms on a formula simplification that was a NOOP. DAG size: 99 [2020-07-21 23:27:00,013 WARN L193 SmtUtils]: Spent 254.00 ms on a formula simplification that was a NOOP. DAG size: 94 [2020-07-21 23:27:00,984 WARN L193 SmtUtils]: Spent 248.00 ms on a formula simplification that was a NOOP. DAG size: 89 [2020-07-21 23:27:01,944 WARN L193 SmtUtils]: Spent 251.00 ms on a formula simplification that was a NOOP. DAG size: 84 [2020-07-21 23:27:02,858 WARN L193 SmtUtils]: Spent 224.00 ms on a formula simplification that was a NOOP. DAG size: 79 [2020-07-21 23:27:03,740 WARN L193 SmtUtils]: Spent 210.00 ms on a formula simplification that was a NOOP. DAG size: 74 [2020-07-21 23:27:04,602 WARN L193 SmtUtils]: Spent 183.00 ms on a formula simplification that was a NOOP. DAG size: 69 [2020-07-21 23:27:05,445 WARN L193 SmtUtils]: Spent 178.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2020-07-21 23:27:06,241 WARN L193 SmtUtils]: Spent 155.00 ms on a formula simplification that was a NOOP. DAG size: 59 [2020-07-21 23:27:06,994 WARN L193 SmtUtils]: Spent 125.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2020-07-21 23:27:07,746 WARN L193 SmtUtils]: Spent 118.00 ms on a formula simplification that was a NOOP. DAG size: 49 [2020-07-21 23:27:08,431 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2020-07-21 23:27:13,971 WARN L193 SmtUtils]: Spent 999.00 ms on a formula simplification that was a NOOP. DAG size: 239 [2020-07-21 23:27:14,003 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:27:14,004 INFO L93 Difference]: Finished difference Result 116 states and 163 transitions. [2020-07-21 23:27:14,007 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 103 states. [2020-07-21 23:27:14,008 INFO L78 Accepts]: Start accepts. Automaton has 102 states. Word has length 59 [2020-07-21 23:27:14,008 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:27:14,010 INFO L225 Difference]: With dead ends: 116 [2020-07-21 23:27:14,010 INFO L226 Difference]: Without dead ends: 108 [2020-07-21 23:27:14,018 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 169 GetRequests, 15 SyntacticMatches, 2 SemanticMatches, 152 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1644 ImplicationChecksByTransitivity, 69.5s TimeCoverageRelationStatistics Valid=7334, Invalid=16228, Unknown=0, NotChecked=0, Total=23562 [2020-07-21 23:27:14,019 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 108 states. [2020-07-21 23:27:14,058 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 108 to 108. [2020-07-21 23:27:14,059 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 108 states. [2020-07-21 23:27:14,061 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 108 states to 108 states and 108 transitions. [2020-07-21 23:27:14,062 INFO L78 Accepts]: Start accepts. Automaton has 108 states and 108 transitions. Word has length 59 [2020-07-21 23:27:14,062 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:27:14,062 INFO L479 AbstractCegarLoop]: Abstraction has 108 states and 108 transitions. [2020-07-21 23:27:14,062 INFO L480 AbstractCegarLoop]: Interpolant automaton has 102 states. [2020-07-21 23:27:14,062 INFO L276 IsEmpty]: Start isEmpty. Operand 108 states and 108 transitions. [2020-07-21 23:27:14,065 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 108 [2020-07-21 23:27:14,066 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:27:14,066 INFO L422 BasicCegarLoop]: trace histogram [94, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:27:14,273 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:27:14,274 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:27:14,274 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:27:14,274 INFO L82 PathProgramCache]: Analyzing trace with hash 1109479102, now seen corresponding path program 6 times [2020-07-21 23:27:14,275 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:27:14,275 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1936962776] [2020-07-21 23:27:14,276 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:27:14,487 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 23:27:14,488 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:27:14,513 WARN L261 TraceCheckSpWp]: Trace formula consists of 698 conjuncts, 577 conjunts are in the unsatisfiable core [2020-07-21 23:27:14,525 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:27:32,689 INFO L134 CoverageAnalysis]: Checked inductivity of 4465 backedges. 0 proven. 4465 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 23:27:32,690 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 23:27:33,380 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 23:28:32,298 INFO L134 CoverageAnalysis]: Checked inductivity of 4465 backedges. 0 proven. 4465 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 23:28:32,299 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1936962776] [2020-07-21 23:28:32,299 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 23:28:32,299 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [101, 101] total 198 [2020-07-21 23:28:32,299 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1434607646] [2020-07-21 23:28:32,300 INFO L459 AbstractCegarLoop]: Interpolant automaton has 198 states [2020-07-21 23:28:32,301 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:28:32,304 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 198 interpolants. [2020-07-21 23:28:32,310 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9426, Invalid=29580, Unknown=0, NotChecked=0, Total=39006 [2020-07-21 23:28:32,310 INFO L87 Difference]: Start difference. First operand 108 states and 108 transitions. Second operand 198 states. [2020-07-21 23:29:20,629 WARN L193 SmtUtils]: Spent 3.64 s on a formula simplification that was a NOOP. DAG size: 484 [2020-07-21 23:29:27,352 WARN L193 SmtUtils]: Spent 5.27 s on a formula simplification. DAG size of input: 482 DAG size of output: 388 [2020-07-21 23:29:48,978 WARN L193 SmtUtils]: Spent 4.17 s on a formula simplification that was a NOOP. DAG size: 479 [2020-07-21 23:29:55,055 WARN L193 SmtUtils]: Spent 5.16 s on a formula simplification. DAG size of input: 481 DAG size of output: 387 [2020-07-21 23:30:17,944 WARN L193 SmtUtils]: Spent 4.40 s on a formula simplification that was a NOOP. DAG size: 474 [2020-07-21 23:30:40,225 WARN L193 SmtUtils]: Spent 3.70 s on a formula simplification that was a NOOP. DAG size: 469 [2020-07-21 23:30:54,265 WARN L193 SmtUtils]: Spent 3.11 s on a formula simplification that was a NOOP. DAG size: 464 [2020-07-21 23:31:09,596 WARN L193 SmtUtils]: Spent 3.13 s on a formula simplification that was a NOOP. DAG size: 459 [2020-07-21 23:31:24,263 WARN L193 SmtUtils]: Spent 3.16 s on a formula simplification that was a NOOP. DAG size: 454 [2020-07-21 23:31:39,928 WARN L193 SmtUtils]: Spent 3.28 s on a formula simplification that was a NOOP. DAG size: 449 [2020-07-21 23:31:55,663 WARN L193 SmtUtils]: Spent 3.18 s on a formula simplification that was a NOOP. DAG size: 444 [2020-07-21 23:32:11,764 WARN L193 SmtUtils]: Spent 3.29 s on a formula simplification that was a NOOP. DAG size: 439 [2020-07-21 23:32:28,191 WARN L193 SmtUtils]: Spent 3.20 s on a formula simplification that was a NOOP. DAG size: 434 [2020-07-21 23:32:44,768 WARN L193 SmtUtils]: Spent 3.21 s on a formula simplification that was a NOOP. DAG size: 429 [2020-07-21 23:33:01,506 WARN L193 SmtUtils]: Spent 3.21 s on a formula simplification that was a NOOP. DAG size: 424 [2020-07-21 23:33:18,847 WARN L193 SmtUtils]: Spent 3.35 s on a formula simplification that was a NOOP. DAG size: 419 [2020-07-21 23:33:36,628 WARN L193 SmtUtils]: Spent 3.29 s on a formula simplification that was a NOOP. DAG size: 414 [2020-07-21 23:33:53,665 WARN L193 SmtUtils]: Spent 3.20 s on a formula simplification that was a NOOP. DAG size: 409 [2020-07-21 23:34:11,186 WARN L193 SmtUtils]: Spent 3.28 s on a formula simplification that was a NOOP. DAG size: 404 [2020-07-21 23:34:28,666 WARN L193 SmtUtils]: Spent 3.16 s on a formula simplification that was a NOOP. DAG size: 399 [2020-07-21 23:34:46,161 WARN L193 SmtUtils]: Spent 3.18 s on a formula simplification that was a NOOP. DAG size: 394 [2020-07-21 23:35:03,804 WARN L193 SmtUtils]: Spent 3.20 s on a formula simplification that was a NOOP. DAG size: 389 [2020-07-21 23:35:21,641 WARN L193 SmtUtils]: Spent 3.19 s on a formula simplification that was a NOOP. DAG size: 384 [2020-07-21 23:35:39,123 WARN L193 SmtUtils]: Spent 3.10 s on a formula simplification that was a NOOP. DAG size: 379 [2020-07-21 23:35:56,716 WARN L193 SmtUtils]: Spent 3.09 s on a formula simplification that was a NOOP. DAG size: 374 [2020-07-21 23:36:14,451 WARN L193 SmtUtils]: Spent 3.19 s on a formula simplification that was a NOOP. DAG size: 369 [2020-07-21 23:36:32,300 WARN L193 SmtUtils]: Spent 3.17 s on a formula simplification that was a NOOP. DAG size: 364 [2020-07-21 23:36:50,450 WARN L193 SmtUtils]: Spent 3.04 s on a formula simplification that was a NOOP. DAG size: 359 [2020-07-21 23:37:08,528 WARN L193 SmtUtils]: Spent 3.00 s on a formula simplification that was a NOOP. DAG size: 354 [2020-07-21 23:37:26,811 WARN L193 SmtUtils]: Spent 3.03 s on a formula simplification that was a NOOP. DAG size: 349 [2020-07-21 23:37:45,031 WARN L193 SmtUtils]: Spent 2.95 s on a formula simplification that was a NOOP. DAG size: 344 [2020-07-21 23:38:03,311 WARN L193 SmtUtils]: Spent 2.95 s on a formula simplification that was a NOOP. DAG size: 339 [2020-07-21 23:38:21,154 WARN L193 SmtUtils]: Spent 2.86 s on a formula simplification that was a NOOP. DAG size: 334 [2020-07-21 23:38:39,604 WARN L193 SmtUtils]: Spent 2.84 s on a formula simplification that was a NOOP. DAG size: 329 [2020-07-21 23:38:57,170 WARN L193 SmtUtils]: Spent 2.92 s on a formula simplification that was a NOOP. DAG size: 324 [2020-07-21 23:39:14,536 WARN L193 SmtUtils]: Spent 2.76 s on a formula simplification that was a NOOP. DAG size: 319 [2020-07-21 23:39:31,853 WARN L193 SmtUtils]: Spent 2.71 s on a formula simplification that was a NOOP. DAG size: 314 [2020-07-21 23:39:49,086 WARN L193 SmtUtils]: Spent 2.81 s on a formula simplification that was a NOOP. DAG size: 309