/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 DAGSIZE --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/locks/test_locks_11.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-20 21:49:08,938 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-20 21:49:08,941 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-20 21:49:08,954 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2020-07-20 21:49:08,963 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-20 21:49:08,964 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-20 21:49:08,965 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-20 21:49:08,966 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-20 21:49:08,967 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-20 21:49:08,968 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-20 21:49:08,969 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-20 21:49:08,971 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-20 21:49:08,973 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-20 21:49:08,974 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-20 21:49:08,975 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-20 21:49:08,976 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-20 21:49:08,978 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-20 21:49:08,995 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-20 21:49:08,995 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-20 21:49:08,996 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-20 21:49:08,997 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 [2020-07-20 21:49:09,012 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-20 21:49:09,012 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-20 21:49:09,014 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-20 21:49:09,014 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-20 21:49:09,014 INFO L138 SettingsManager]: * Use SBE=true [2020-07-20 21:49:09,014 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-20 21:49:09,015 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-20 21:49:09,015 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-20 21:49:09,015 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-20 21:49:09,015 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-20 21:49:09,015 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-20 21:49:09,015 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-20 21:49:09,016 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-20 21:49:09,016 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-20 21:49:09,016 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-20 21:49:09,016 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-20 21:49:09,016 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-20 21:49:09,017 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-20 21:49:09,017 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-20 21:49:09,017 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-20 21:49:09,017 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-20 21:49:09,017 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 21:49:09,018 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-20 21:49:09,018 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-20 21:49:09,018 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-20 21:49:09,018 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-20 21:49:09,018 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:49:09,019 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-20 21:49:09,019 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-20 21:49:09,019 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 -> DAGSIZE 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 [2020-07-20 21:49:09,351 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-20 21:49:09,365 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-20 21:49:09,368 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-20 21:49:09,370 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-20 21:49:09,370 INFO L275 PluginConnector]: CDTParser initialized [2020-07-20 21:49:09,371 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/locks/test_locks_11.c [2020-07-20 21:49:09,441 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/7b5a59850/3251d3ea43cf42b495a5bf9fca1f8910/FLAG78dba2c20 [2020-07-20 21:49:10,022 INFO L306 CDTParser]: Found 1 translation units. [2020-07-20 21:49:10,023 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/locks/test_locks_11.c [2020-07-20 21:49:10,030 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/7b5a59850/3251d3ea43cf42b495a5bf9fca1f8910/FLAG78dba2c20 [2020-07-20 21:49:10,358 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/7b5a59850/3251d3ea43cf42b495a5bf9fca1f8910 [2020-07-20 21:49:10,367 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-20 21:49:10,370 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-20 21:49:10,372 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-20 21:49:10,372 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-20 21:49:10,375 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-20 21:49:10,376 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 09:49:10" (1/1) ... [2020-07-20 21:49:10,379 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@34d87159 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:49:10, skipping insertion in model container [2020-07-20 21:49:10,380 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 09:49:10" (1/1) ... [2020-07-20 21:49:10,391 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-20 21:49:10,426 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-20 21:49:10,651 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 21:49:10,658 INFO L203 MainTranslator]: Completed pre-run [2020-07-20 21:49:10,688 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 21:49:10,703 INFO L208 MainTranslator]: Completed translation [2020-07-20 21:49:10,704 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:49:10 WrapperNode [2020-07-20 21:49:10,704 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-20 21:49:10,705 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-20 21:49:10,705 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-20 21:49:10,705 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-20 21:49:10,817 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:49:10" (1/1) ... [2020-07-20 21:49:10,818 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:49:10" (1/1) ... [2020-07-20 21:49:10,827 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:49:10" (1/1) ... [2020-07-20 21:49:10,828 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:49:10" (1/1) ... [2020-07-20 21:49:10,835 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:49:10" (1/1) ... [2020-07-20 21:49:10,843 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:49:10" (1/1) ... [2020-07-20 21:49:10,845 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:49:10" (1/1) ... [2020-07-20 21:49:10,852 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-20 21:49:10,853 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-20 21:49:10,853 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-20 21:49:10,854 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-20 21:49:10,855 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:49:10" (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 [2020-07-20 21:49:10,922 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-20 21:49:10,922 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-20 21:49:10,922 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-20 21:49:10,922 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-20 21:49:10,924 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-20 21:49:10,925 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-20 21:49:10,925 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-20 21:49:10,926 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-20 21:49:11,265 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-20 21:49:11,265 INFO L295 CfgBuilder]: Removed 1 assume(true) statements. [2020-07-20 21:49:11,271 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 09:49:11 BoogieIcfgContainer [2020-07-20 21:49:11,271 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-20 21:49:11,273 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-20 21:49:11,273 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-20 21:49:11,276 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-20 21:49:11,277 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.07 09:49:10" (1/3) ... [2020-07-20 21:49:11,278 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@347a3c08 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 09:49:11, skipping insertion in model container [2020-07-20 21:49:11,278 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:49:10" (2/3) ... [2020-07-20 21:49:11,278 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@347a3c08 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 09:49:11, skipping insertion in model container [2020-07-20 21:49:11,278 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 09:49:11" (3/3) ... [2020-07-20 21:49:11,280 INFO L109 eAbstractionObserver]: Analyzing ICFG test_locks_11.c [2020-07-20 21:49:11,293 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-20 21:49:11,302 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-20 21:49:11,319 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-20 21:49:11,346 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-20 21:49:11,346 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-20 21:49:11,347 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-20 21:49:11,347 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-20 21:49:11,347 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-20 21:49:11,347 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-20 21:49:11,348 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-20 21:49:11,348 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-20 21:49:11,370 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states. [2020-07-20 21:49:11,379 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-07-20 21:49:11,379 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:49:11,381 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:49:11,381 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:49:11,389 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:49:11,389 INFO L82 PathProgramCache]: Analyzing trace with hash -316470182, now seen corresponding path program 1 times [2020-07-20 21:49:11,400 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:49:11,401 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [342562475] [2020-07-20 21:49:11,401 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 [2020-07-20 21:49:11,534 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:49:11,535 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:49:11,538 INFO L263 TraceCheckSpWp]: Trace formula consists of 111 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 21:49:11,548 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:49:11,597 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 21:49:11,597 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 21:49:11,599 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [342562475] [2020-07-20 21:49:11,600 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 21:49:11,600 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 21:49:11,601 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1433497941] [2020-07-20 21:49:11,606 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 21:49:11,607 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:49:11,618 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 21:49:11,619 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 21:49:11,622 INFO L87 Difference]: Start difference. First operand 47 states. Second operand 3 states. [2020-07-20 21:49:11,692 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:49:11,693 INFO L93 Difference]: Finished difference Result 93 states and 162 transitions. [2020-07-20 21:49:11,693 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 21:49:11,695 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 21 [2020-07-20 21:49:11,695 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:49:11,709 INFO L225 Difference]: With dead ends: 93 [2020-07-20 21:49:11,709 INFO L226 Difference]: Without dead ends: 78 [2020-07-20 21:49:11,713 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 19 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 21:49:11,735 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2020-07-20 21:49:11,763 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 54. [2020-07-20 21:49:11,765 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 54 states. [2020-07-20 21:49:11,768 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 97 transitions. [2020-07-20 21:49:11,770 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 97 transitions. Word has length 21 [2020-07-20 21:49:11,771 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:49:11,771 INFO L479 AbstractCegarLoop]: Abstraction has 54 states and 97 transitions. [2020-07-20 21:49:11,771 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 21:49:11,771 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 97 transitions. [2020-07-20 21:49:11,772 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-07-20 21:49:11,773 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:49:11,773 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:49:11,987 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:49:11,988 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:49:11,989 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:49:11,989 INFO L82 PathProgramCache]: Analyzing trace with hash -1327587432, now seen corresponding path program 1 times [2020-07-20 21:49:11,990 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:49:11,990 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1067248411] [2020-07-20 21:49:11,991 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 [2020-07-20 21:49:12,084 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:49:12,084 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:49:12,086 INFO L263 TraceCheckSpWp]: Trace formula consists of 110 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 21:49:12,088 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:49:12,098 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 21:49:12,099 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 21:49:12,100 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1067248411] [2020-07-20 21:49:12,100 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 21:49:12,100 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 21:49:12,100 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [36679000] [2020-07-20 21:49:12,103 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 21:49:12,103 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:49:12,104 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 21:49:12,104 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 21:49:12,104 INFO L87 Difference]: Start difference. First operand 54 states and 97 transitions. Second operand 3 states. [2020-07-20 21:49:12,133 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:49:12,133 INFO L93 Difference]: Finished difference Result 127 states and 232 transitions. [2020-07-20 21:49:12,134 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 21:49:12,134 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 21 [2020-07-20 21:49:12,135 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:49:12,137 INFO L225 Difference]: With dead ends: 127 [2020-07-20 21:49:12,137 INFO L226 Difference]: Without dead ends: 78 [2020-07-20 21:49:12,139 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 19 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 21:49:12,140 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2020-07-20 21:49:12,150 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 76. [2020-07-20 21:49:12,151 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 76 states. [2020-07-20 21:49:12,153 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 137 transitions. [2020-07-20 21:49:12,153 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 137 transitions. Word has length 21 [2020-07-20 21:49:12,154 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:49:12,154 INFO L479 AbstractCegarLoop]: Abstraction has 76 states and 137 transitions. [2020-07-20 21:49:12,154 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 21:49:12,154 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 137 transitions. [2020-07-20 21:49:12,155 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-07-20 21:49:12,156 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:49:12,156 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:49:12,370 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:49:12,371 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:49:12,372 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:49:12,372 INFO L82 PathProgramCache]: Analyzing trace with hash -1220427994, now seen corresponding path program 1 times [2020-07-20 21:49:12,372 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:49:12,373 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [792797809] [2020-07-20 21:49:12,373 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 [2020-07-20 21:49:12,442 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:49:12,442 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:49:12,443 INFO L263 TraceCheckSpWp]: Trace formula consists of 112 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 21:49:12,445 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:49:12,460 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 21:49:12,461 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 21:49:12,462 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [792797809] [2020-07-20 21:49:12,462 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 21:49:12,462 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 21:49:12,462 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1575467340] [2020-07-20 21:49:12,463 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 21:49:12,463 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:49:12,464 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 21:49:12,464 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 21:49:12,465 INFO L87 Difference]: Start difference. First operand 76 states and 137 transitions. Second operand 3 states. [2020-07-20 21:49:12,492 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:49:12,492 INFO L93 Difference]: Finished difference Result 117 states and 207 transitions. [2020-07-20 21:49:12,493 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 21:49:12,493 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 22 [2020-07-20 21:49:12,493 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:49:12,495 INFO L225 Difference]: With dead ends: 117 [2020-07-20 21:49:12,495 INFO L226 Difference]: Without dead ends: 81 [2020-07-20 21:49:12,496 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 21:49:12,497 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 81 states. [2020-07-20 21:49:12,506 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 81 to 79. [2020-07-20 21:49:12,506 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 79 states. [2020-07-20 21:49:12,509 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 139 transitions. [2020-07-20 21:49:12,509 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 139 transitions. Word has length 22 [2020-07-20 21:49:12,509 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:49:12,510 INFO L479 AbstractCegarLoop]: Abstraction has 79 states and 139 transitions. [2020-07-20 21:49:12,510 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 21:49:12,510 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 139 transitions. [2020-07-20 21:49:12,511 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-07-20 21:49:12,511 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:49:12,512 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:49:12,725 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:49:12,727 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:49:12,727 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:49:12,728 INFO L82 PathProgramCache]: Analyzing trace with hash 1794675624, now seen corresponding path program 1 times [2020-07-20 21:49:12,729 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:49:12,729 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1601378738] [2020-07-20 21:49:12,730 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 [2020-07-20 21:49:12,798 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:49:12,799 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:49:12,800 INFO L263 TraceCheckSpWp]: Trace formula consists of 111 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 21:49:12,804 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:49:12,821 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 21:49:12,822 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 21:49:12,823 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1601378738] [2020-07-20 21:49:12,823 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 21:49:12,823 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 21:49:12,824 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [248741574] [2020-07-20 21:49:12,824 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 21:49:12,824 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:49:12,825 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 21:49:12,825 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 21:49:12,825 INFO L87 Difference]: Start difference. First operand 79 states and 139 transitions. Second operand 3 states. [2020-07-20 21:49:12,852 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:49:12,852 INFO L93 Difference]: Finished difference Result 148 states and 264 transitions. [2020-07-20 21:49:12,853 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 21:49:12,853 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 22 [2020-07-20 21:49:12,854 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:49:12,859 INFO L225 Difference]: With dead ends: 148 [2020-07-20 21:49:12,859 INFO L226 Difference]: Without dead ends: 146 [2020-07-20 21:49:12,860 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 21:49:12,861 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 146 states. [2020-07-20 21:49:12,872 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 146 to 104. [2020-07-20 21:49:12,873 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 104 states. [2020-07-20 21:49:12,875 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 104 states to 104 states and 184 transitions. [2020-07-20 21:49:12,875 INFO L78 Accepts]: Start accepts. Automaton has 104 states and 184 transitions. Word has length 22 [2020-07-20 21:49:12,876 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:49:12,876 INFO L479 AbstractCegarLoop]: Abstraction has 104 states and 184 transitions. [2020-07-20 21:49:12,876 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 21:49:12,877 INFO L276 IsEmpty]: Start isEmpty. Operand 104 states and 184 transitions. [2020-07-20 21:49:12,878 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-07-20 21:49:12,878 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:49:12,879 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:49:13,093 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:49:13,094 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:49:13,094 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:49:13,095 INFO L82 PathProgramCache]: Analyzing trace with hash 783558374, now seen corresponding path program 1 times [2020-07-20 21:49:13,095 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:49:13,096 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1502153500] [2020-07-20 21:49:13,096 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 [2020-07-20 21:49:13,174 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:49:13,175 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:49:13,177 INFO L263 TraceCheckSpWp]: Trace formula consists of 110 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 21:49:13,179 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:49:13,188 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 21:49:13,189 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 21:49:13,189 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1502153500] [2020-07-20 21:49:13,189 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 21:49:13,190 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 21:49:13,190 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1231716250] [2020-07-20 21:49:13,190 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 21:49:13,191 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:49:13,191 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 21:49:13,191 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 21:49:13,191 INFO L87 Difference]: Start difference. First operand 104 states and 184 transitions. Second operand 3 states. [2020-07-20 21:49:13,221 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:49:13,221 INFO L93 Difference]: Finished difference Result 244 states and 438 transitions. [2020-07-20 21:49:13,222 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 21:49:13,222 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 22 [2020-07-20 21:49:13,223 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:49:13,225 INFO L225 Difference]: With dead ends: 244 [2020-07-20 21:49:13,225 INFO L226 Difference]: Without dead ends: 148 [2020-07-20 21:49:13,226 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 21:49:13,227 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 148 states. [2020-07-20 21:49:13,238 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 148 to 146. [2020-07-20 21:49:13,239 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 146 states. [2020-07-20 21:49:13,241 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 146 states to 146 states and 258 transitions. [2020-07-20 21:49:13,241 INFO L78 Accepts]: Start accepts. Automaton has 146 states and 258 transitions. Word has length 22 [2020-07-20 21:49:13,241 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:49:13,242 INFO L479 AbstractCegarLoop]: Abstraction has 146 states and 258 transitions. [2020-07-20 21:49:13,242 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 21:49:13,242 INFO L276 IsEmpty]: Start isEmpty. Operand 146 states and 258 transitions. [2020-07-20 21:49:13,243 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2020-07-20 21:49:13,243 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:49:13,243 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:49:13,459 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:49:13,460 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:49:13,460 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:49:13,461 INFO L82 PathProgramCache]: Analyzing trace with hash -199417107, now seen corresponding path program 1 times [2020-07-20 21:49:13,461 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:49:13,462 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [369571394] [2020-07-20 21:49:13,462 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 [2020-07-20 21:49:13,508 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:49:13,509 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:49:13,510 INFO L263 TraceCheckSpWp]: Trace formula consists of 110 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 21:49:13,511 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:49:13,529 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 21:49:13,529 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 21:49:13,530 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [369571394] [2020-07-20 21:49:13,530 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 21:49:13,530 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 21:49:13,531 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1658974940] [2020-07-20 21:49:13,531 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 21:49:13,531 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:49:13,532 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 21:49:13,532 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 21:49:13,532 INFO L87 Difference]: Start difference. First operand 146 states and 258 transitions. Second operand 3 states. [2020-07-20 21:49:13,551 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:49:13,551 INFO L93 Difference]: Finished difference Result 219 states and 385 transitions. [2020-07-20 21:49:13,552 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 21:49:13,552 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 23 [2020-07-20 21:49:13,553 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:49:13,554 INFO L225 Difference]: With dead ends: 219 [2020-07-20 21:49:13,554 INFO L226 Difference]: Without dead ends: 150 [2020-07-20 21:49:13,556 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 21:49:13,556 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 150 states. [2020-07-20 21:49:13,566 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 150 to 148. [2020-07-20 21:49:13,567 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 148 states. [2020-07-20 21:49:13,569 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 148 states to 148 states and 258 transitions. [2020-07-20 21:49:13,569 INFO L78 Accepts]: Start accepts. Automaton has 148 states and 258 transitions. Word has length 23 [2020-07-20 21:49:13,569 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:49:13,569 INFO L479 AbstractCegarLoop]: Abstraction has 148 states and 258 transitions. [2020-07-20 21:49:13,569 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 21:49:13,570 INFO L276 IsEmpty]: Start isEmpty. Operand 148 states and 258 transitions. [2020-07-20 21:49:13,571 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2020-07-20 21:49:13,571 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:49:13,571 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:49:13,787 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:49:13,788 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:49:13,788 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:49:13,788 INFO L82 PathProgramCache]: Analyzing trace with hash -1479280785, now seen corresponding path program 1 times [2020-07-20 21:49:13,789 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:49:13,789 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [407391397] [2020-07-20 21:49:13,790 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 [2020-07-20 21:49:13,836 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:49:13,836 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:49:13,838 INFO L263 TraceCheckSpWp]: Trace formula consists of 109 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 21:49:13,841 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:49:13,863 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 21:49:13,863 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 21:49:13,863 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [407391397] [2020-07-20 21:49:13,864 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 21:49:13,864 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 21:49:13,864 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [730562533] [2020-07-20 21:49:13,866 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 21:49:13,866 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:49:13,867 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 21:49:13,867 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 21:49:13,867 INFO L87 Difference]: Start difference. First operand 148 states and 258 transitions. Second operand 3 states. [2020-07-20 21:49:13,892 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:49:13,893 INFO L93 Difference]: Finished difference Result 276 states and 488 transitions. [2020-07-20 21:49:13,893 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 21:49:13,893 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 23 [2020-07-20 21:49:13,894 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:49:13,896 INFO L225 Difference]: With dead ends: 276 [2020-07-20 21:49:13,896 INFO L226 Difference]: Without dead ends: 274 [2020-07-20 21:49:13,897 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 21:49:13,898 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 274 states. [2020-07-20 21:49:13,910 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 274 to 200. [2020-07-20 21:49:13,911 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 200 states. [2020-07-20 21:49:13,913 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 200 states to 200 states and 346 transitions. [2020-07-20 21:49:13,914 INFO L78 Accepts]: Start accepts. Automaton has 200 states and 346 transitions. Word has length 23 [2020-07-20 21:49:13,914 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:49:13,914 INFO L479 AbstractCegarLoop]: Abstraction has 200 states and 346 transitions. [2020-07-20 21:49:13,914 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 21:49:13,914 INFO L276 IsEmpty]: Start isEmpty. Operand 200 states and 346 transitions. [2020-07-20 21:49:13,916 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2020-07-20 21:49:13,916 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:49:13,916 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:49:14,130 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:49:14,131 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:49:14,131 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:49:14,131 INFO L82 PathProgramCache]: Analyzing trace with hash 1804569261, now seen corresponding path program 1 times [2020-07-20 21:49:14,132 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:49:14,132 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [697536553] [2020-07-20 21:49:14,133 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 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:49:14,175 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:49:14,176 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:49:14,177 INFO L263 TraceCheckSpWp]: Trace formula consists of 108 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 21:49:14,178 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:49:14,193 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 21:49:14,194 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 21:49:14,195 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [697536553] [2020-07-20 21:49:14,196 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 21:49:14,196 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 21:49:14,196 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1739511569] [2020-07-20 21:49:14,197 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 21:49:14,197 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:49:14,197 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 21:49:14,198 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 21:49:14,198 INFO L87 Difference]: Start difference. First operand 200 states and 346 transitions. Second operand 3 states. [2020-07-20 21:49:14,241 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:49:14,241 INFO L93 Difference]: Finished difference Result 472 states and 824 transitions. [2020-07-20 21:49:14,242 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 21:49:14,242 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 23 [2020-07-20 21:49:14,242 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:49:14,244 INFO L225 Difference]: With dead ends: 472 [2020-07-20 21:49:14,244 INFO L226 Difference]: Without dead ends: 282 [2020-07-20 21:49:14,248 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 21:49:14,253 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 282 states. [2020-07-20 21:49:14,283 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 282 to 280. [2020-07-20 21:49:14,284 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 280 states. [2020-07-20 21:49:14,292 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 280 states to 280 states and 482 transitions. [2020-07-20 21:49:14,293 INFO L78 Accepts]: Start accepts. Automaton has 280 states and 482 transitions. Word has length 23 [2020-07-20 21:49:14,293 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:49:14,293 INFO L479 AbstractCegarLoop]: Abstraction has 280 states and 482 transitions. [2020-07-20 21:49:14,293 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 21:49:14,293 INFO L276 IsEmpty]: Start isEmpty. Operand 280 states and 482 transitions. [2020-07-20 21:49:14,297 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-07-20 21:49:14,298 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:49:14,298 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:49:14,499 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:49:14,500 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:49:14,500 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:49:14,500 INFO L82 PathProgramCache]: Analyzing trace with hash 1387149659, now seen corresponding path program 1 times [2020-07-20 21:49:14,501 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:49:14,501 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [799704630] [2020-07-20 21:49:14,502 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 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:49:14,545 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:49:14,545 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:49:14,546 INFO L263 TraceCheckSpWp]: Trace formula consists of 109 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 21:49:14,552 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:49:14,564 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 21:49:14,564 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 21:49:14,564 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [799704630] [2020-07-20 21:49:14,565 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 21:49:14,565 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 21:49:14,565 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [906289050] [2020-07-20 21:49:14,565 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 21:49:14,566 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:49:14,566 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 21:49:14,566 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 21:49:14,568 INFO L87 Difference]: Start difference. First operand 280 states and 482 transitions. Second operand 3 states. [2020-07-20 21:49:14,592 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:49:14,592 INFO L93 Difference]: Finished difference Result 520 states and 908 transitions. [2020-07-20 21:49:14,593 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 21:49:14,593 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 24 [2020-07-20 21:49:14,594 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:49:14,597 INFO L225 Difference]: With dead ends: 520 [2020-07-20 21:49:14,597 INFO L226 Difference]: Without dead ends: 518 [2020-07-20 21:49:14,598 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 22 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 21:49:14,599 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 518 states. [2020-07-20 21:49:14,612 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 518 to 388. [2020-07-20 21:49:14,613 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 388 states. [2020-07-20 21:49:14,615 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 388 states to 388 states and 658 transitions. [2020-07-20 21:49:14,615 INFO L78 Accepts]: Start accepts. Automaton has 388 states and 658 transitions. Word has length 24 [2020-07-20 21:49:14,616 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:49:14,616 INFO L479 AbstractCegarLoop]: Abstraction has 388 states and 658 transitions. [2020-07-20 21:49:14,616 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 21:49:14,616 INFO L276 IsEmpty]: Start isEmpty. Operand 388 states and 658 transitions. [2020-07-20 21:49:14,618 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-07-20 21:49:14,619 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:49:14,619 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:49:14,833 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:49:14,834 INFO L427 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:49:14,835 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:49:14,835 INFO L82 PathProgramCache]: Analyzing trace with hash 376032409, now seen corresponding path program 1 times [2020-07-20 21:49:14,835 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:49:14,836 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1007506080] [2020-07-20 21:49:14,836 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 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:49:14,893 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:49:14,894 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:49:14,895 INFO L263 TraceCheckSpWp]: Trace formula consists of 108 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 21:49:14,907 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:49:14,923 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 21:49:14,923 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 21:49:14,923 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1007506080] [2020-07-20 21:49:14,924 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 21:49:14,924 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 21:49:14,924 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [67605689] [2020-07-20 21:49:14,925 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 21:49:14,925 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:49:14,925 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 21:49:14,925 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 21:49:14,926 INFO L87 Difference]: Start difference. First operand 388 states and 658 transitions. Second operand 3 states. [2020-07-20 21:49:14,972 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:49:14,972 INFO L93 Difference]: Finished difference Result 920 states and 1572 transitions. [2020-07-20 21:49:14,973 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 21:49:14,973 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 24 [2020-07-20 21:49:14,973 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:49:14,976 INFO L225 Difference]: With dead ends: 920 [2020-07-20 21:49:14,977 INFO L226 Difference]: Without dead ends: 542 [2020-07-20 21:49:14,980 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 22 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 21:49:14,981 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 542 states. [2020-07-20 21:49:15,024 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 542 to 540. [2020-07-20 21:49:15,025 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 540 states. [2020-07-20 21:49:15,030 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 540 states to 540 states and 910 transitions. [2020-07-20 21:49:15,030 INFO L78 Accepts]: Start accepts. Automaton has 540 states and 910 transitions. Word has length 24 [2020-07-20 21:49:15,034 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:49:15,035 INFO L479 AbstractCegarLoop]: Abstraction has 540 states and 910 transitions. [2020-07-20 21:49:15,035 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 21:49:15,035 INFO L276 IsEmpty]: Start isEmpty. Operand 540 states and 910 transitions. [2020-07-20 21:49:15,037 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-07-20 21:49:15,038 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:49:15,038 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:49:15,253 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:49:15,253 INFO L427 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:49:15,254 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:49:15,254 INFO L82 PathProgramCache]: Analyzing trace with hash 52180548, now seen corresponding path program 1 times [2020-07-20 21:49:15,254 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:49:15,255 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [288286285] [2020-07-20 21:49:15,255 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 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:49:15,297 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 21:49:15,298 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:49:15,299 INFO L263 TraceCheckSpWp]: Trace formula consists of 101 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 21:49:15,302 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:49:15,316 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 21:49:15,317 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 21:49:15,317 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [288286285] [2020-07-20 21:49:15,318 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 21:49:15,318 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 21:49:15,318 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2009307362] [2020-07-20 21:49:15,319 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 21:49:15,319 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:49:15,319 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 21:49:15,320 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 21:49:15,320 INFO L87 Difference]: Start difference. First operand 540 states and 910 transitions. Second operand 3 states. [2020-07-20 21:49:15,357 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:49:15,357 INFO L93 Difference]: Finished difference Result 992 states and 1696 transitions. [2020-07-20 21:49:15,360 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 21:49:15,360 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 25 [2020-07-20 21:49:15,360 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:49:15,367 INFO L225 Difference]: With dead ends: 992 [2020-07-20 21:49:15,368 INFO L226 Difference]: Without dead ends: 990 [2020-07-20 21:49:15,375 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 23 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 21:49:15,377 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 990 states. [2020-07-20 21:49:15,405 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 990 to 764. [2020-07-20 21:49:15,405 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 764 states. [2020-07-20 21:49:15,431 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 764 states to 764 states and 1262 transitions. [2020-07-20 21:49:15,431 INFO L78 Accepts]: Start accepts. Automaton has 764 states and 1262 transitions. Word has length 25 [2020-07-20 21:49:15,432 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:49:15,432 INFO L479 AbstractCegarLoop]: Abstraction has 764 states and 1262 transitions. [2020-07-20 21:49:15,432 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 21:49:15,432 INFO L276 IsEmpty]: Start isEmpty. Operand 764 states and 1262 transitions. [2020-07-20 21:49:15,437 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-07-20 21:49:15,438 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:49:15,438 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:49:15,651 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:49:15,652 INFO L427 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:49:15,653 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:49:15,653 INFO L82 PathProgramCache]: Analyzing trace with hash -958936702, now seen corresponding path program 1 times [2020-07-20 21:49:15,653 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:49:15,654 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1220429601] [2020-07-20 21:49:15,654 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 13 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:49:15,692 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:49:15,693 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:49:15,694 INFO L263 TraceCheckSpWp]: Trace formula consists of 115 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 21:49:15,695 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:49:15,706 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 21:49:15,707 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 21:49:15,708 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1220429601] [2020-07-20 21:49:15,708 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 21:49:15,708 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 21:49:15,708 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1403737985] [2020-07-20 21:49:15,709 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 21:49:15,709 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:49:15,709 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 21:49:15,710 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 21:49:15,710 INFO L87 Difference]: Start difference. First operand 764 states and 1262 transitions. Second operand 3 states. [2020-07-20 21:49:15,738 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:49:15,738 INFO L93 Difference]: Finished difference Result 1140 states and 1876 transitions. [2020-07-20 21:49:15,738 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 21:49:15,738 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 25 [2020-07-20 21:49:15,739 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:49:15,743 INFO L225 Difference]: With dead ends: 1140 [2020-07-20 21:49:15,743 INFO L226 Difference]: Without dead ends: 770 [2020-07-20 21:49:15,745 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 23 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 21:49:15,746 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 770 states. [2020-07-20 21:49:15,764 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 770 to 768. [2020-07-20 21:49:15,764 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 768 states. [2020-07-20 21:49:15,768 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 768 states to 768 states and 1246 transitions. [2020-07-20 21:49:15,769 INFO L78 Accepts]: Start accepts. Automaton has 768 states and 1246 transitions. Word has length 25 [2020-07-20 21:49:15,769 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:49:15,769 INFO L479 AbstractCegarLoop]: Abstraction has 768 states and 1246 transitions. [2020-07-20 21:49:15,769 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 21:49:15,770 INFO L276 IsEmpty]: Start isEmpty. Operand 768 states and 1246 transitions. [2020-07-20 21:49:15,771 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-07-20 21:49:15,771 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:49:15,772 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:49:15,986 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:49:15,986 INFO L427 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:49:15,986 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:49:15,987 INFO L82 PathProgramCache]: Analyzing trace with hash -1980005056, now seen corresponding path program 1 times [2020-07-20 21:49:15,987 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:49:15,987 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [191111887] [2020-07-20 21:49:15,988 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 14 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:49:16,028 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:49:16,029 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:49:16,030 INFO L263 TraceCheckSpWp]: Trace formula consists of 114 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 21:49:16,031 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:49:16,044 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 21:49:16,044 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 21:49:16,045 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [191111887] [2020-07-20 21:49:16,045 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 21:49:16,045 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 21:49:16,045 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [572662573] [2020-07-20 21:49:16,046 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 21:49:16,046 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:49:16,047 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 21:49:16,047 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 21:49:16,048 INFO L87 Difference]: Start difference. First operand 768 states and 1246 transitions. Second operand 3 states. [2020-07-20 21:49:16,074 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:49:16,074 INFO L93 Difference]: Finished difference Result 1148 states and 1856 transitions. [2020-07-20 21:49:16,074 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 21:49:16,075 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 25 [2020-07-20 21:49:16,075 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:49:16,079 INFO L225 Difference]: With dead ends: 1148 [2020-07-20 21:49:16,080 INFO L226 Difference]: Without dead ends: 778 [2020-07-20 21:49:16,081 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 23 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 21:49:16,083 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 778 states. [2020-07-20 21:49:16,101 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 778 to 776. [2020-07-20 21:49:16,101 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 776 states. [2020-07-20 21:49:16,105 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 776 states to 776 states and 1238 transitions. [2020-07-20 21:49:16,106 INFO L78 Accepts]: Start accepts. Automaton has 776 states and 1238 transitions. Word has length 25 [2020-07-20 21:49:16,106 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:49:16,106 INFO L479 AbstractCegarLoop]: Abstraction has 776 states and 1238 transitions. [2020-07-20 21:49:16,107 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 21:49:16,107 INFO L276 IsEmpty]: Start isEmpty. Operand 776 states and 1238 transitions. [2020-07-20 21:49:16,108 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-07-20 21:49:16,109 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:49:16,109 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:49:16,321 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:49:16,323 INFO L427 AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:49:16,323 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:49:16,323 INFO L82 PathProgramCache]: Analyzing trace with hash 1035098562, now seen corresponding path program 1 times [2020-07-20 21:49:16,324 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:49:16,324 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1658785028] [2020-07-20 21:49:16,324 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 15 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:49:16,384 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:49:16,384 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:49:16,386 INFO L263 TraceCheckSpWp]: Trace formula consists of 113 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 21:49:16,387 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:49:16,395 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 21:49:16,396 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 21:49:16,396 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1658785028] [2020-07-20 21:49:16,397 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 21:49:16,397 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 21:49:16,397 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [38816500] [2020-07-20 21:49:16,398 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 21:49:16,398 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:49:16,398 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 21:49:16,399 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 21:49:16,399 INFO L87 Difference]: Start difference. First operand 776 states and 1238 transitions. Second operand 3 states. [2020-07-20 21:49:16,440 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:49:16,440 INFO L93 Difference]: Finished difference Result 1820 states and 2920 transitions. [2020-07-20 21:49:16,441 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 21:49:16,441 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 25 [2020-07-20 21:49:16,442 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:49:16,449 INFO L225 Difference]: With dead ends: 1820 [2020-07-20 21:49:16,449 INFO L226 Difference]: Without dead ends: 1066 [2020-07-20 21:49:16,452 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 23 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 21:49:16,454 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1066 states. [2020-07-20 21:49:16,489 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1066 to 1064. [2020-07-20 21:49:16,489 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1064 states. [2020-07-20 21:49:16,497 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1064 states to 1064 states and 1686 transitions. [2020-07-20 21:49:16,498 INFO L78 Accepts]: Start accepts. Automaton has 1064 states and 1686 transitions. Word has length 25 [2020-07-20 21:49:16,498 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:49:16,498 INFO L479 AbstractCegarLoop]: Abstraction has 1064 states and 1686 transitions. [2020-07-20 21:49:16,498 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 21:49:16,499 INFO L276 IsEmpty]: Start isEmpty. Operand 1064 states and 1686 transitions. [2020-07-20 21:49:16,501 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-07-20 21:49:16,501 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:49:16,502 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:49:16,715 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:49:16,716 INFO L427 AbstractCegarLoop]: === Iteration 15 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:49:16,716 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:49:16,717 INFO L82 PathProgramCache]: Analyzing trace with hash -991604848, now seen corresponding path program 1 times [2020-07-20 21:49:16,717 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:49:16,717 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1837625519] [2020-07-20 21:49:16,718 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 16 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:49:16,763 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 21:49:16,764 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:49:16,765 INFO L263 TraceCheckSpWp]: Trace formula consists of 99 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 21:49:16,766 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:49:16,772 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 21:49:16,772 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 21:49:16,773 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1837625519] [2020-07-20 21:49:16,773 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 21:49:16,773 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 21:49:16,773 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1108571077] [2020-07-20 21:49:16,774 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 21:49:16,774 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:49:16,774 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 21:49:16,774 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 21:49:16,775 INFO L87 Difference]: Start difference. First operand 1064 states and 1686 transitions. Second operand 3 states. [2020-07-20 21:49:16,809 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:49:16,810 INFO L93 Difference]: Finished difference Result 1916 states and 3096 transitions. [2020-07-20 21:49:16,810 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 21:49:16,811 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 26 [2020-07-20 21:49:16,811 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:49:16,820 INFO L225 Difference]: With dead ends: 1916 [2020-07-20 21:49:16,820 INFO L226 Difference]: Without dead ends: 1914 [2020-07-20 21:49:16,821 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 24 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 21:49:16,824 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1914 states. [2020-07-20 21:49:16,863 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1914 to 1528. [2020-07-20 21:49:16,863 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1528 states. [2020-07-20 21:49:16,871 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1528 states to 1528 states and 2358 transitions. [2020-07-20 21:49:16,871 INFO L78 Accepts]: Start accepts. Automaton has 1528 states and 2358 transitions. Word has length 26 [2020-07-20 21:49:16,872 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:49:16,872 INFO L479 AbstractCegarLoop]: Abstraction has 1528 states and 2358 transitions. [2020-07-20 21:49:16,872 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 21:49:16,872 INFO L276 IsEmpty]: Start isEmpty. Operand 1528 states and 2358 transitions. [2020-07-20 21:49:16,875 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-07-20 21:49:16,875 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:49:16,875 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:49:17,089 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:49:17,089 INFO L427 AbstractCegarLoop]: === Iteration 16 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:49:17,090 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:49:17,090 INFO L82 PathProgramCache]: Analyzing trace with hash -2002722098, now seen corresponding path program 1 times [2020-07-20 21:49:17,090 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:49:17,090 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [677576989] [2020-07-20 21:49:17,090 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 17 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:49:17,133 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:49:17,134 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:49:17,135 INFO L263 TraceCheckSpWp]: Trace formula consists of 112 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 21:49:17,136 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:49:17,152 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 21:49:17,152 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 21:49:17,153 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [677576989] [2020-07-20 21:49:17,153 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 21:49:17,153 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 21:49:17,153 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1011014010] [2020-07-20 21:49:17,154 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 21:49:17,154 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:49:17,154 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 21:49:17,155 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 21:49:17,155 INFO L87 Difference]: Start difference. First operand 1528 states and 2358 transitions. Second operand 3 states. [2020-07-20 21:49:17,196 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:49:17,196 INFO L93 Difference]: Finished difference Result 2284 states and 3512 transitions. [2020-07-20 21:49:17,197 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 21:49:17,197 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 26 [2020-07-20 21:49:17,197 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:49:17,207 INFO L225 Difference]: With dead ends: 2284 [2020-07-20 21:49:17,207 INFO L226 Difference]: Without dead ends: 1546 [2020-07-20 21:49:17,211 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 24 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 21:49:17,213 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1546 states. [2020-07-20 21:49:17,257 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1546 to 1544. [2020-07-20 21:49:17,257 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1544 states. [2020-07-20 21:49:17,302 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1544 states to 1544 states and 2342 transitions. [2020-07-20 21:49:17,303 INFO L78 Accepts]: Start accepts. Automaton has 1544 states and 2342 transitions. Word has length 26 [2020-07-20 21:49:17,303 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:49:17,305 INFO L479 AbstractCegarLoop]: Abstraction has 1544 states and 2342 transitions. [2020-07-20 21:49:17,305 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 21:49:17,306 INFO L276 IsEmpty]: Start isEmpty. Operand 1544 states and 2342 transitions. [2020-07-20 21:49:17,309 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-07-20 21:49:17,309 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:49:17,309 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:49:17,524 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:49:17,525 INFO L427 AbstractCegarLoop]: === Iteration 17 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:49:17,525 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:49:17,526 INFO L82 PathProgramCache]: Analyzing trace with hash 1012381520, now seen corresponding path program 1 times [2020-07-20 21:49:17,526 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:49:17,526 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [748142942] [2020-07-20 21:49:17,527 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 18 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:49:17,581 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:49:17,582 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:49:17,583 INFO L263 TraceCheckSpWp]: Trace formula consists of 111 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 21:49:17,584 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:49:17,594 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 21:49:17,594 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 21:49:17,595 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [748142942] [2020-07-20 21:49:17,595 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 21:49:17,595 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 21:49:17,595 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [794715888] [2020-07-20 21:49:17,596 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 21:49:17,596 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:49:17,596 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 21:49:17,596 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 21:49:17,597 INFO L87 Difference]: Start difference. First operand 1544 states and 2342 transitions. Second operand 3 states. [2020-07-20 21:49:17,648 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:49:17,649 INFO L93 Difference]: Finished difference Result 3596 states and 5480 transitions. [2020-07-20 21:49:17,649 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 21:49:17,650 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 26 [2020-07-20 21:49:17,650 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:49:17,663 INFO L225 Difference]: With dead ends: 3596 [2020-07-20 21:49:17,663 INFO L226 Difference]: Without dead ends: 2090 [2020-07-20 21:49:17,668 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 24 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 21:49:17,671 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2090 states. [2020-07-20 21:49:17,734 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2090 to 2088. [2020-07-20 21:49:17,734 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 2088 states. [2020-07-20 21:49:17,745 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2088 states to 2088 states and 3142 transitions. [2020-07-20 21:49:17,745 INFO L78 Accepts]: Start accepts. Automaton has 2088 states and 3142 transitions. Word has length 26 [2020-07-20 21:49:17,745 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:49:17,746 INFO L479 AbstractCegarLoop]: Abstraction has 2088 states and 3142 transitions. [2020-07-20 21:49:17,746 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 21:49:17,746 INFO L276 IsEmpty]: Start isEmpty. Operand 2088 states and 3142 transitions. [2020-07-20 21:49:17,750 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-07-20 21:49:17,750 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:49:17,750 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:49:17,965 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:49:17,966 INFO L427 AbstractCegarLoop]: === Iteration 18 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:49:17,967 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:49:17,967 INFO L82 PathProgramCache]: Analyzing trace with hash -1695832809, now seen corresponding path program 1 times [2020-07-20 21:49:17,967 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:49:17,968 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [612924501] [2020-07-20 21:49:17,968 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 19 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:49:18,014 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 21:49:18,014 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:49:18,015 INFO L263 TraceCheckSpWp]: Trace formula consists of 98 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 21:49:18,016 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:49:18,024 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 21:49:18,024 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 21:49:18,025 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [612924501] [2020-07-20 21:49:18,025 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 21:49:18,025 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 21:49:18,025 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1007929238] [2020-07-20 21:49:18,026 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 21:49:18,026 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:49:18,026 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 21:49:18,026 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 21:49:18,027 INFO L87 Difference]: Start difference. First operand 2088 states and 3142 transitions. Second operand 3 states. [2020-07-20 21:49:18,086 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:49:18,086 INFO L93 Difference]: Finished difference Result 3692 states and 5672 transitions. [2020-07-20 21:49:18,087 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 21:49:18,087 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 27 [2020-07-20 21:49:18,087 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:49:18,106 INFO L225 Difference]: With dead ends: 3692 [2020-07-20 21:49:18,107 INFO L226 Difference]: Without dead ends: 3690 [2020-07-20 21:49:18,109 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 25 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 21:49:18,114 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3690 states. [2020-07-20 21:49:18,185 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3690 to 3048. [2020-07-20 21:49:18,186 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3048 states. [2020-07-20 21:49:18,195 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3048 states to 3048 states and 4454 transitions. [2020-07-20 21:49:18,196 INFO L78 Accepts]: Start accepts. Automaton has 3048 states and 4454 transitions. Word has length 27 [2020-07-20 21:49:18,196 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:49:18,196 INFO L479 AbstractCegarLoop]: Abstraction has 3048 states and 4454 transitions. [2020-07-20 21:49:18,197 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 21:49:18,197 INFO L276 IsEmpty]: Start isEmpty. Operand 3048 states and 4454 transitions. [2020-07-20 21:49:18,202 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-07-20 21:49:18,202 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:49:18,203 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:49:18,416 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:49:18,417 INFO L427 AbstractCegarLoop]: === Iteration 19 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:49:18,417 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:49:18,417 INFO L82 PathProgramCache]: Analyzing trace with hash 1588017237, now seen corresponding path program 1 times [2020-07-20 21:49:18,418 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:49:18,418 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1259346168] [2020-07-20 21:49:18,418 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 20 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:49:18,457 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:49:18,458 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:49:18,459 INFO L263 TraceCheckSpWp]: Trace formula consists of 111 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 21:49:18,461 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:49:18,470 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 21:49:18,471 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 21:49:18,471 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1259346168] [2020-07-20 21:49:18,473 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 21:49:18,473 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 21:49:18,473 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1473276171] [2020-07-20 21:49:18,474 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 21:49:18,474 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:49:18,474 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 21:49:18,474 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 21:49:18,474 INFO L87 Difference]: Start difference. First operand 3048 states and 4454 transitions. Second operand 3 states. [2020-07-20 21:49:18,541 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:49:18,541 INFO L93 Difference]: Finished difference Result 7084 states and 10408 transitions. [2020-07-20 21:49:18,542 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 21:49:18,542 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 27 [2020-07-20 21:49:18,542 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:49:18,562 INFO L225 Difference]: With dead ends: 7084 [2020-07-20 21:49:18,563 INFO L226 Difference]: Without dead ends: 4074 [2020-07-20 21:49:18,572 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 25 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 21:49:18,577 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4074 states. [2020-07-20 21:49:18,698 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4074 to 4072. [2020-07-20 21:49:18,699 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 4072 states. [2020-07-20 21:49:18,709 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4072 states to 4072 states and 5894 transitions. [2020-07-20 21:49:18,710 INFO L78 Accepts]: Start accepts. Automaton has 4072 states and 5894 transitions. Word has length 27 [2020-07-20 21:49:18,710 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:49:18,710 INFO L479 AbstractCegarLoop]: Abstraction has 4072 states and 5894 transitions. [2020-07-20 21:49:18,710 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 21:49:18,711 INFO L276 IsEmpty]: Start isEmpty. Operand 4072 states and 5894 transitions. [2020-07-20 21:49:18,716 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-07-20 21:49:18,717 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:49:18,717 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:49:18,932 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:49:18,933 INFO L427 AbstractCegarLoop]: === Iteration 20 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:49:18,933 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:49:18,933 INFO L82 PathProgramCache]: Analyzing trace with hash -1030994425, now seen corresponding path program 1 times [2020-07-20 21:49:18,934 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:49:18,934 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1930959901] [2020-07-20 21:49:18,934 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 21 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:49:18,971 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:49:18,972 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:49:18,972 INFO L263 TraceCheckSpWp]: Trace formula consists of 112 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 21:49:18,974 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:49:18,985 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 21:49:18,985 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 21:49:18,986 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1930959901] [2020-07-20 21:49:18,986 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 21:49:18,986 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 21:49:18,986 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [721595467] [2020-07-20 21:49:18,987 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 21:49:18,987 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:49:18,987 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 21:49:18,987 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 21:49:18,987 INFO L87 Difference]: Start difference. First operand 4072 states and 5894 transitions. Second operand 3 states. [2020-07-20 21:49:19,093 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:49:19,094 INFO L93 Difference]: Finished difference Result 12012 states and 17288 transitions. [2020-07-20 21:49:19,094 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 21:49:19,095 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 28 [2020-07-20 21:49:19,095 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:49:19,154 INFO L225 Difference]: With dead ends: 12012 [2020-07-20 21:49:19,154 INFO L226 Difference]: Without dead ends: 7978 [2020-07-20 21:49:19,167 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 26 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 21:49:19,176 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 7978 states. [2020-07-20 21:49:19,377 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 7978 to 7976. [2020-07-20 21:49:19,378 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 7976 states. [2020-07-20 21:49:19,399 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7976 states to 7976 states and 11206 transitions. [2020-07-20 21:49:19,399 INFO L78 Accepts]: Start accepts. Automaton has 7976 states and 11206 transitions. Word has length 28 [2020-07-20 21:49:19,399 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:49:19,399 INFO L479 AbstractCegarLoop]: Abstraction has 7976 states and 11206 transitions. [2020-07-20 21:49:19,400 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 21:49:19,400 INFO L276 IsEmpty]: Start isEmpty. Operand 7976 states and 11206 transitions. [2020-07-20 21:49:19,412 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-07-20 21:49:19,412 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:49:19,412 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:49:19,626 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:49:19,626 INFO L427 AbstractCegarLoop]: === Iteration 21 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:49:19,627 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:49:19,627 INFO L82 PathProgramCache]: Analyzing trace with hash -19877175, now seen corresponding path program 1 times [2020-07-20 21:49:19,627 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:49:19,628 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [34143547] [2020-07-20 21:49:19,628 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 22 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:49:19,681 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 21:49:19,681 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:49:19,682 INFO L263 TraceCheckSpWp]: Trace formula consists of 99 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 21:49:19,683 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:49:19,693 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 21:49:19,694 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 21:49:19,694 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [34143547] [2020-07-20 21:49:19,694 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 21:49:19,695 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 21:49:19,695 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1975876836] [2020-07-20 21:49:19,696 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 21:49:19,697 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:49:19,697 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 21:49:19,697 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 21:49:19,698 INFO L87 Difference]: Start difference. First operand 7976 states and 11206 transitions. Second operand 3 states. [2020-07-20 21:49:19,881 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:49:19,881 INFO L93 Difference]: Finished difference Result 9004 states and 13000 transitions. [2020-07-20 21:49:19,882 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 21:49:19,882 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 28 [2020-07-20 21:49:19,883 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:49:19,906 INFO L225 Difference]: With dead ends: 9004 [2020-07-20 21:49:19,906 INFO L226 Difference]: Without dead ends: 9002 [2020-07-20 21:49:19,911 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 26 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 21:49:19,921 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9002 states. [2020-07-20 21:49:20,079 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9002 to 7976. [2020-07-20 21:49:20,080 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 7976 states. [2020-07-20 21:49:20,099 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7976 states to 7976 states and 11078 transitions. [2020-07-20 21:49:20,100 INFO L78 Accepts]: Start accepts. Automaton has 7976 states and 11078 transitions. Word has length 28 [2020-07-20 21:49:20,100 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:49:20,100 INFO L479 AbstractCegarLoop]: Abstraction has 7976 states and 11078 transitions. [2020-07-20 21:49:20,100 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 21:49:20,100 INFO L276 IsEmpty]: Start isEmpty. Operand 7976 states and 11078 transitions. [2020-07-20 21:49:20,112 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2020-07-20 21:49:20,112 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:49:20,112 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:49:20,326 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:49:20,327 INFO L427 AbstractCegarLoop]: === Iteration 22 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:49:20,327 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:49:20,327 INFO L82 PathProgramCache]: Analyzing trace with hash -1895840660, now seen corresponding path program 1 times [2020-07-20 21:49:20,328 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:49:20,328 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1152672707] [2020-07-20 21:49:20,328 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 23 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:49:20,361 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 21:49:20,362 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:49:20,363 INFO L263 TraceCheckSpWp]: Trace formula consists of 102 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 21:49:20,364 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:49:20,376 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 21:49:20,376 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 21:49:20,376 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1152672707] [2020-07-20 21:49:20,377 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 21:49:20,377 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 21:49:20,377 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [252727908] [2020-07-20 21:49:20,377 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 21:49:20,377 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:49:20,378 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 21:49:20,378 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 21:49:20,378 INFO L87 Difference]: Start difference. First operand 7976 states and 11078 transitions. Second operand 3 states. [2020-07-20 21:49:20,548 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:49:20,550 INFO L93 Difference]: Finished difference Result 13612 states and 19144 transitions. [2020-07-20 21:49:20,551 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 21:49:20,551 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 29 [2020-07-20 21:49:20,551 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:49:20,594 INFO L225 Difference]: With dead ends: 13612 [2020-07-20 21:49:20,594 INFO L226 Difference]: Without dead ends: 13610 [2020-07-20 21:49:20,605 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 27 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 21:49:20,629 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13610 states. [2020-07-20 21:49:20,997 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13610 to 12072. [2020-07-20 21:49:20,997 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 12072 states. [2020-07-20 21:49:21,026 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12072 states to 12072 states and 16326 transitions. [2020-07-20 21:49:21,027 INFO L78 Accepts]: Start accepts. Automaton has 12072 states and 16326 transitions. Word has length 29 [2020-07-20 21:49:21,028 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:49:21,028 INFO L479 AbstractCegarLoop]: Abstraction has 12072 states and 16326 transitions. [2020-07-20 21:49:21,028 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 21:49:21,028 INFO L276 IsEmpty]: Start isEmpty. Operand 12072 states and 16326 transitions. [2020-07-20 21:49:21,051 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2020-07-20 21:49:21,052 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:49:21,052 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:49:21,264 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:49:21,265 INFO L427 AbstractCegarLoop]: === Iteration 23 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:49:21,266 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:49:21,266 INFO L82 PathProgramCache]: Analyzing trace with hash 1388009386, now seen corresponding path program 1 times [2020-07-20 21:49:21,266 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:49:21,266 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1857472514] [2020-07-20 21:49:21,267 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 24 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:49:21,310 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 21:49:21,310 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:49:21,312 INFO L263 TraceCheckSpWp]: Trace formula consists of 101 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 21:49:21,315 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:49:21,322 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 21:49:21,323 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 21:49:21,324 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1857472514] [2020-07-20 21:49:21,324 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 21:49:21,324 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 21:49:21,325 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1039778495] [2020-07-20 21:49:21,325 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 21:49:21,325 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:49:21,326 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 21:49:21,326 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 21:49:21,326 INFO L87 Difference]: Start difference. First operand 12072 states and 16326 transitions. Second operand 3 states. [2020-07-20 21:49:21,551 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:49:21,551 INFO L93 Difference]: Finished difference Result 27692 states and 37576 transitions. [2020-07-20 21:49:21,552 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 21:49:21,552 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 29 [2020-07-20 21:49:21,552 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:49:21,590 INFO L225 Difference]: With dead ends: 27692 [2020-07-20 21:49:21,591 INFO L226 Difference]: Without dead ends: 15658 [2020-07-20 21:49:21,622 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 27 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 21:49:21,647 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15658 states. [2020-07-20 21:49:22,097 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15658 to 15656. [2020-07-20 21:49:22,097 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15656 states. [2020-07-20 21:49:22,131 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15656 states to 15656 states and 20806 transitions. [2020-07-20 21:49:22,132 INFO L78 Accepts]: Start accepts. Automaton has 15656 states and 20806 transitions. Word has length 29 [2020-07-20 21:49:22,132 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:49:22,132 INFO L479 AbstractCegarLoop]: Abstraction has 15656 states and 20806 transitions. [2020-07-20 21:49:22,132 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 21:49:22,132 INFO L276 IsEmpty]: Start isEmpty. Operand 15656 states and 20806 transitions. [2020-07-20 21:49:22,156 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2020-07-20 21:49:22,157 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:49:22,157 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:49:22,370 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:49:22,371 INFO L427 AbstractCegarLoop]: === Iteration 24 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:49:22,372 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:49:22,372 INFO L82 PathProgramCache]: Analyzing trace with hash 1358697468, now seen corresponding path program 1 times [2020-07-20 21:49:22,372 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:49:22,373 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [818064291] [2020-07-20 21:49:22,373 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 25 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:49:22,409 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 21:49:22,410 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:49:22,411 INFO L263 TraceCheckSpWp]: Trace formula consists of 102 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 21:49:22,412 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:49:22,418 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 21:49:22,419 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 21:49:22,419 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [818064291] [2020-07-20 21:49:22,419 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 21:49:22,420 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 21:49:22,420 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1112596454] [2020-07-20 21:49:22,420 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 21:49:22,420 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:49:22,420 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 21:49:22,421 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 21:49:22,421 INFO L87 Difference]: Start difference. First operand 15656 states and 20806 transitions. Second operand 3 states. [2020-07-20 21:49:22,650 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:49:22,650 INFO L93 Difference]: Finished difference Result 26156 states and 34888 transitions. [2020-07-20 21:49:22,651 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 21:49:22,651 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 30 [2020-07-20 21:49:22,651 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:49:22,715 INFO L225 Difference]: With dead ends: 26156 [2020-07-20 21:49:22,715 INFO L226 Difference]: Without dead ends: 26154 [2020-07-20 21:49:23,255 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 28 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 21:49:23,278 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26154 states. [2020-07-20 21:49:23,707 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26154 to 24104. [2020-07-20 21:49:23,708 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24104 states. [2020-07-20 21:49:23,758 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24104 states to 24104 states and 31302 transitions. [2020-07-20 21:49:23,758 INFO L78 Accepts]: Start accepts. Automaton has 24104 states and 31302 transitions. Word has length 30 [2020-07-20 21:49:23,759 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:49:23,759 INFO L479 AbstractCegarLoop]: Abstraction has 24104 states and 31302 transitions. [2020-07-20 21:49:23,759 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 21:49:23,759 INFO L276 IsEmpty]: Start isEmpty. Operand 24104 states and 31302 transitions. [2020-07-20 21:49:23,805 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2020-07-20 21:49:23,805 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:49:23,806 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:49:24,019 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:49:24,020 INFO L427 AbstractCegarLoop]: === Iteration 25 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:49:24,020 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:49:24,021 INFO L82 PathProgramCache]: Analyzing trace with hash 347580218, now seen corresponding path program 1 times [2020-07-20 21:49:24,021 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:49:24,021 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1642002234] [2020-07-20 21:49:24,021 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 26 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 26 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:49:24,061 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 21:49:24,061 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:49:24,062 INFO L263 TraceCheckSpWp]: Trace formula consists of 101 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 21:49:24,064 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:49:24,069 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 21:49:24,070 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 21:49:24,070 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1642002234] [2020-07-20 21:49:24,070 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 21:49:24,070 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 21:49:24,071 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1866970095] [2020-07-20 21:49:24,071 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 21:49:24,071 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:49:24,071 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 21:49:24,071 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 21:49:24,072 INFO L87 Difference]: Start difference. First operand 24104 states and 31302 transitions. Second operand 3 states. [2020-07-20 21:49:24,568 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:49:24,569 INFO L93 Difference]: Finished difference Result 54828 states and 71240 transitions. [2020-07-20 21:49:24,569 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 21:49:24,569 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 30 [2020-07-20 21:49:24,570 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:49:24,652 INFO L225 Difference]: With dead ends: 54828 [2020-07-20 21:49:24,652 INFO L226 Difference]: Without dead ends: 30762 [2020-07-20 21:49:24,709 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 28 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 21:49:24,734 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30762 states. [2020-07-20 21:49:25,479 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30762 to 30760. [2020-07-20 21:49:25,480 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30760 states. [2020-07-20 21:49:25,543 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30760 states to 30760 states and 38982 transitions. [2020-07-20 21:49:25,543 INFO L78 Accepts]: Start accepts. Automaton has 30760 states and 38982 transitions. Word has length 30 [2020-07-20 21:49:25,543 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:49:25,544 INFO L479 AbstractCegarLoop]: Abstraction has 30760 states and 38982 transitions. [2020-07-20 21:49:25,544 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 21:49:25,544 INFO L276 IsEmpty]: Start isEmpty. Operand 30760 states and 38982 transitions. [2020-07-20 21:49:25,583 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2020-07-20 21:49:25,583 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:49:25,583 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:49:25,789 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:49:25,790 INFO L427 AbstractCegarLoop]: === Iteration 26 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:49:25,790 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:49:25,791 INFO L82 PathProgramCache]: Analyzing trace with hash -829835327, now seen corresponding path program 1 times [2020-07-20 21:49:25,791 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:49:25,792 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1299183579] [2020-07-20 21:49:25,792 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 27 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 27 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:49:25,824 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 21:49:25,825 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:49:25,825 INFO L263 TraceCheckSpWp]: Trace formula consists of 102 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 21:49:25,826 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:49:25,838 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 21:49:25,838 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 21:49:25,838 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1299183579] [2020-07-20 21:49:25,838 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 21:49:25,838 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 21:49:25,839 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1213030301] [2020-07-20 21:49:25,839 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 21:49:25,839 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:49:25,839 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 21:49:25,839 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 21:49:25,840 INFO L87 Difference]: Start difference. First operand 30760 states and 38982 transitions. Second operand 3 states. [2020-07-20 21:49:26,226 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:49:26,226 INFO L93 Difference]: Finished difference Result 50218 states and 63047 transitions. [2020-07-20 21:49:26,227 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 21:49:26,227 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 31 [2020-07-20 21:49:26,227 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:49:26,327 INFO L225 Difference]: With dead ends: 50218 [2020-07-20 21:49:26,327 INFO L226 Difference]: Without dead ends: 50216 [2020-07-20 21:49:26,353 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 29 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 21:49:26,397 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50216 states. [2020-07-20 21:49:27,904 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50216 to 48168. [2020-07-20 21:49:27,905 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48168 states. [2020-07-20 21:49:27,975 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48168 states to 48168 states and 59974 transitions. [2020-07-20 21:49:27,975 INFO L78 Accepts]: Start accepts. Automaton has 48168 states and 59974 transitions. Word has length 31 [2020-07-20 21:49:27,975 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:49:27,976 INFO L479 AbstractCegarLoop]: Abstraction has 48168 states and 59974 transitions. [2020-07-20 21:49:27,976 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 21:49:27,976 INFO L276 IsEmpty]: Start isEmpty. Operand 48168 states and 59974 transitions. [2020-07-20 21:49:28,013 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2020-07-20 21:49:28,013 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:49:28,013 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:49:28,214 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:49:28,215 INFO L427 AbstractCegarLoop]: === Iteration 27 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:49:28,215 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:49:28,215 INFO L82 PathProgramCache]: Analyzing trace with hash -1840952577, now seen corresponding path program 1 times [2020-07-20 21:49:28,216 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:49:28,216 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1214605119] [2020-07-20 21:49:28,216 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 28 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 28 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:49:28,249 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 21:49:28,249 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:49:28,250 INFO L263 TraceCheckSpWp]: Trace formula consists of 101 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 21:49:28,251 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:49:28,275 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 21:49:28,275 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 21:49:28,276 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1214605119] [2020-07-20 21:49:28,276 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 21:49:28,276 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 21:49:28,276 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1359902908] [2020-07-20 21:49:28,277 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 21:49:28,277 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:49:28,277 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 21:49:28,277 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 21:49:28,277 INFO L87 Difference]: Start difference. First operand 48168 states and 59974 transitions. Second operand 3 states. [2020-07-20 21:49:28,983 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:49:28,983 INFO L93 Difference]: Finished difference Result 108584 states and 134726 transitions. [2020-07-20 21:49:28,984 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 21:49:28,984 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 31 [2020-07-20 21:49:28,984 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:49:28,984 INFO L225 Difference]: With dead ends: 108584 [2020-07-20 21:49:28,985 INFO L226 Difference]: Without dead ends: 0 [2020-07-20 21:49:29,108 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 29 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 21:49:29,109 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2020-07-20 21:49:29,109 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2020-07-20 21:49:29,109 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2020-07-20 21:49:29,110 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2020-07-20 21:49:29,110 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 31 [2020-07-20 21:49:29,110 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:49:29,110 INFO L479 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2020-07-20 21:49:29,110 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 21:49:29,110 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2020-07-20 21:49:29,111 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2020-07-20 21:49:29,324 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:49:29,329 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2020-07-20 21:49:29,385 INFO L271 CegarLoopResult]: At program point ULTIMATE.initFINAL(line -1) the Hoare annotation is: true [2020-07-20 21:49:29,385 INFO L268 CegarLoopResult]: For program point ULTIMATE.initEXIT(line -1) no Hoare annotation was computed. [2020-07-20 21:49:29,385 INFO L268 CegarLoopResult]: For program point ULTIMATE.startEXIT(line -1) no Hoare annotation was computed. [2020-07-20 21:49:29,385 INFO L271 CegarLoopResult]: At program point L-1(line -1) the Hoare annotation is: true [2020-07-20 21:49:29,385 INFO L271 CegarLoopResult]: At program point ULTIMATE.startENTRY(line -1) the Hoare annotation is: true [2020-07-20 21:49:29,385 INFO L268 CegarLoopResult]: For program point ULTIMATE.startFINAL(line -1) no Hoare annotation was computed. [2020-07-20 21:49:29,385 INFO L268 CegarLoopResult]: For program point mainEXIT(lines 4 177) no Hoare annotation was computed. [2020-07-20 21:49:29,386 INFO L268 CegarLoopResult]: For program point L118(line 118) no Hoare annotation was computed. [2020-07-20 21:49:29,386 INFO L268 CegarLoopResult]: For program point L143(line 143) no Hoare annotation was computed. [2020-07-20 21:49:29,386 INFO L268 CegarLoopResult]: For program point L44(lines 44 46) no Hoare annotation was computed. [2020-07-20 21:49:29,386 INFO L268 CegarLoopResult]: For program point L168(line 168) no Hoare annotation was computed. [2020-07-20 21:49:29,386 INFO L264 CegarLoopResult]: At program point L168-1(lines 5 177) the Hoare annotation is: false [2020-07-20 21:49:29,386 INFO L268 CegarLoopResult]: For program point L127-1(lines 42 172) no Hoare annotation was computed. [2020-07-20 21:49:29,386 INFO L268 CegarLoopResult]: For program point L152-1(lines 42 172) no Hoare annotation was computed. [2020-07-20 21:49:29,386 INFO L268 CegarLoopResult]: For program point L111-1(lines 42 172) no Hoare annotation was computed. [2020-07-20 21:49:29,387 INFO L268 CegarLoopResult]: For program point L103-1(lines 42 172) no Hoare annotation was computed. [2020-07-20 21:49:29,387 INFO L268 CegarLoopResult]: For program point L128(line 128) no Hoare annotation was computed. [2020-07-20 21:49:29,387 INFO L268 CegarLoopResult]: For program point L95-1(lines 42 172) no Hoare annotation was computed. [2020-07-20 21:49:29,387 INFO L268 CegarLoopResult]: For program point L153(line 153) no Hoare annotation was computed. [2020-07-20 21:49:29,387 INFO L268 CegarLoopResult]: For program point L87-1(lines 42 172) no Hoare annotation was computed. [2020-07-20 21:49:29,387 INFO L268 CegarLoopResult]: For program point L79-1(lines 42 172) no Hoare annotation was computed. [2020-07-20 21:49:29,387 INFO L268 CegarLoopResult]: For program point mainFINAL(lines 4 177) no Hoare annotation was computed. [2020-07-20 21:49:29,387 INFO L268 CegarLoopResult]: For program point L137-1(lines 42 172) no Hoare annotation was computed. [2020-07-20 21:49:29,388 INFO L268 CegarLoopResult]: For program point L71(lines 71 73) no Hoare annotation was computed. [2020-07-20 21:49:29,388 INFO L268 CegarLoopResult]: For program point L71-2(lines 42 172) no Hoare annotation was computed. [2020-07-20 21:49:29,388 INFO L268 CegarLoopResult]: For program point L162-1(lines 42 172) no Hoare annotation was computed. [2020-07-20 21:49:29,388 INFO L268 CegarLoopResult]: For program point mainErr0ASSERT_VIOLATIONERROR_FUNCTION(line 175) no Hoare annotation was computed. [2020-07-20 21:49:29,388 INFO L271 CegarLoopResult]: At program point mainENTRY(lines 4 177) the Hoare annotation is: true [2020-07-20 21:49:29,393 INFO L268 CegarLoopResult]: For program point L138(line 138) no Hoare annotation was computed. [2020-07-20 21:49:29,394 INFO L268 CegarLoopResult]: For program point L163(line 163) no Hoare annotation was computed. [2020-07-20 21:49:29,394 INFO L268 CegarLoopResult]: For program point L122-1(lines 42 172) no Hoare annotation was computed. [2020-07-20 21:49:29,394 INFO L268 CegarLoopResult]: For program point L147-1(lines 42 172) no Hoare annotation was computed. [2020-07-20 21:49:29,394 INFO L268 CegarLoopResult]: For program point L123(line 123) no Hoare annotation was computed. [2020-07-20 21:49:29,394 INFO L268 CegarLoopResult]: For program point L148(line 148) no Hoare annotation was computed. [2020-07-20 21:49:29,394 INFO L271 CegarLoopResult]: At program point L173(lines 5 177) the Hoare annotation is: true [2020-07-20 21:49:29,394 INFO L268 CegarLoopResult]: For program point L107-1(lines 42 172) no Hoare annotation was computed. [2020-07-20 21:49:29,394 INFO L268 CegarLoopResult]: For program point L132-1(lines 42 172) no Hoare annotation was computed. [2020-07-20 21:49:29,395 INFO L268 CegarLoopResult]: For program point L99-1(lines 42 172) no Hoare annotation was computed. [2020-07-20 21:49:29,395 INFO L268 CegarLoopResult]: For program point L157-1(lines 42 172) no Hoare annotation was computed. [2020-07-20 21:49:29,395 INFO L268 CegarLoopResult]: For program point L91-1(lines 42 172) no Hoare annotation was computed. [2020-07-20 21:49:29,395 INFO L268 CegarLoopResult]: For program point L83-1(lines 42 172) no Hoare annotation was computed. [2020-07-20 21:49:29,395 INFO L268 CegarLoopResult]: For program point L75-1(lines 42 172) no Hoare annotation was computed. [2020-07-20 21:49:29,395 INFO L268 CegarLoopResult]: For program point L133(line 133) no Hoare annotation was computed. [2020-07-20 21:49:29,395 INFO L268 CegarLoopResult]: For program point L158(line 158) no Hoare annotation was computed. [2020-07-20 21:49:29,395 INFO L268 CegarLoopResult]: For program point L117-1(lines 42 172) no Hoare annotation was computed. [2020-07-20 21:49:29,396 INFO L268 CegarLoopResult]: For program point L142-1(lines 42 172) no Hoare annotation was computed. [2020-07-20 21:49:29,396 INFO L271 CegarLoopResult]: At program point L167-1(lines 42 172) the Hoare annotation is: true [2020-07-20 21:49:29,417 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 20.07 09:49:29 BoogieIcfgContainer [2020-07-20 21:49:29,417 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-07-20 21:49:29,420 INFO L168 Benchmark]: Toolchain (without parser) took 19050.04 ms. Allocated memory was 135.3 MB in the beginning and 971.0 MB in the end (delta: 835.7 MB). Free memory was 99.1 MB in the beginning and 419.1 MB in the end (delta: -320.0 MB). Peak memory consumption was 515.7 MB. Max. memory is 7.1 GB. [2020-07-20 21:49:29,420 INFO L168 Benchmark]: CDTParser took 0.20 ms. Allocated memory is still 135.3 MB. Free memory was 117.0 MB in the beginning and 116.8 MB in the end (delta: 209.7 kB). Peak memory consumption was 209.7 kB. Max. memory is 7.1 GB. [2020-07-20 21:49:29,421 INFO L168 Benchmark]: CACSL2BoogieTranslator took 333.12 ms. Allocated memory is still 135.3 MB. Free memory was 98.7 MB in the beginning and 87.8 MB in the end (delta: 10.9 MB). Peak memory consumption was 10.9 MB. Max. memory is 7.1 GB. [2020-07-20 21:49:29,422 INFO L168 Benchmark]: Boogie Preprocessor took 147.60 ms. Allocated memory was 135.3 MB in the beginning and 198.7 MB in the end (delta: 63.4 MB). Free memory was 87.8 MB in the beginning and 176.7 MB in the end (delta: -88.9 MB). Peak memory consumption was 13.9 MB. Max. memory is 7.1 GB. [2020-07-20 21:49:29,426 INFO L168 Benchmark]: RCFGBuilder took 418.12 ms. Allocated memory is still 198.7 MB. Free memory was 176.0 MB in the beginning and 156.2 MB in the end (delta: 19.7 MB). Peak memory consumption was 19.7 MB. Max. memory is 7.1 GB. [2020-07-20 21:49:29,427 INFO L168 Benchmark]: TraceAbstraction took 18144.17 ms. Allocated memory was 198.7 MB in the beginning and 971.0 MB in the end (delta: 772.3 MB). Free memory was 155.5 MB in the beginning and 419.1 MB in the end (delta: -263.6 MB). Peak memory consumption was 508.7 MB. Max. memory is 7.1 GB. [2020-07-20 21:49:29,431 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.20 ms. Allocated memory is still 135.3 MB. Free memory was 117.0 MB in the beginning and 116.8 MB in the end (delta: 209.7 kB). Peak memory consumption was 209.7 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 333.12 ms. Allocated memory is still 135.3 MB. Free memory was 98.7 MB in the beginning and 87.8 MB in the end (delta: 10.9 MB). Peak memory consumption was 10.9 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 147.60 ms. Allocated memory was 135.3 MB in the beginning and 198.7 MB in the end (delta: 63.4 MB). Free memory was 87.8 MB in the beginning and 176.7 MB in the end (delta: -88.9 MB). Peak memory consumption was 13.9 MB. Max. memory is 7.1 GB. * RCFGBuilder took 418.12 ms. Allocated memory is still 198.7 MB. Free memory was 176.0 MB in the beginning and 156.2 MB in the end (delta: 19.7 MB). Peak memory consumption was 19.7 MB. Max. memory is 7.1 GB. * TraceAbstraction took 18144.17 ms. Allocated memory was 198.7 MB in the beginning and 971.0 MB in the end (delta: 772.3 MB). Free memory was 155.5 MB in the beginning and 419.1 MB in the end (delta: -263.6 MB). Peak memory consumption was 508.7 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - PositiveResult [Line: 175]: call of __VERIFIER_error() unreachable For all program executions holds that call of __VERIFIER_error() unreachable at this location - AllSpecificationsHoldResult: All specifications hold 1 specifications checked. All of them hold - InvariantResult [Line: 42]: Loop Invariant Derived loop invariant: 1 - InvariantResult [Line: 5]: Loop Invariant Derived loop invariant: 0 - InvariantResult [Line: 5]: Loop Invariant Derived loop invariant: 1 - StatisticsResult: Ultimate Automizer benchmark data CFG has 3 procedures, 47 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: SAFE, OverallTime: 17.9s, OverallIterations: 27, TraceHistogramMax: 1, AutomataDifference: 4.7s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 2499 SDtfs, 1212 SDslu, 1726 SDs, 0 SdLazy, 145 SolverSat, 27 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.3s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 666 GetRequests, 639 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=48168occurred in iteration=26, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 5.1s AutomataMinimizationTime, 27 MinimizatonAttempts, 8216 StatesRemovedByMinimization, 26 NontrivialMinimizations, HoareAnnotationStatistics: 0.0s HoareAnnotationTime, 7 LocationsWithAnnotation, 7 PreInvPairs, 2058 NumberOfFragments, 7 HoareAnnotationTreeSize, 7 FomulaSimplifications, 0 FormulaSimplificationTreeSizeReduction, 0.0s HoareSimplificationTime, 7 FomulaSimplificationsInter, 0 FormulaSimplificationTreeSizeReductionInter, 0.0s HoareSimplificationTimeInter, RefinementEngineStatistics: TRACE_CHECK: 0.2s SsaConstructionTime, 0.6s SatisfiabilityAnalysisTime, 0.4s InterpolantComputationTime, 693 NumberOfCodeBlocks, 479 NumberOfCodeBlocksAsserted, 71 NumberOfCheckSat, 666 ConstructedInterpolants, 0 QuantifiedInterpolants, 33150 SizeOfPredicates, 0 NumberOfNonLiveVariables, 2892 ConjunctsInSsa, 81 ConjunctsInUnsatCore, 27 InterpolantComputations, 27 PerfectInterpolantSequences, 0/0 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be correct! Received shutdown request...