/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 NOT_INCREMENTALLY -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/bitvector/gcd_4.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-21 10:40:19,681 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-21 10:40:19,683 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-21 10:40:19,699 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-21 10:40:19,699 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-21 10:40:19,700 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-21 10:40:19,701 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-21 10:40:19,703 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-21 10:40:19,705 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-21 10:40:19,706 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-21 10:40:19,707 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-21 10:40:19,708 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-21 10:40:19,708 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-21 10:40:19,709 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-21 10:40:19,710 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-21 10:40:19,711 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-21 10:40:19,712 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-21 10:40:19,712 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-21 10:40:19,714 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-21 10:40:19,716 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-21 10:40:19,717 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-21 10:40:19,718 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-21 10:40:19,719 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-21 10:40:19,720 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-21 10:40:19,723 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-21 10:40:19,730 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-21 10:40:19,731 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-21 10:40:19,731 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-21 10:40:19,732 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-07-21 10:40:19,747 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-21 10:40:19,747 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-21 10:40:19,748 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-21 10:40:19,748 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-21 10:40:19,749 INFO L138 SettingsManager]: * Use SBE=true [2020-07-21 10:40:19,749 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-21 10:40:19,749 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-21 10:40:19,749 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-21 10:40:19,749 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-21 10:40:19,750 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-21 10:40:19,750 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-21 10:40:19,750 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-21 10:40:19,750 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-21 10:40:19,750 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-21 10:40:19,751 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-21 10:40:19,751 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-21 10:40:19,751 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-21 10:40:19,751 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-21 10:40:19,752 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-21 10:40:19,752 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-21 10:40:19,752 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-21 10:40:19,752 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 10:40:19,752 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-21 10:40:19,753 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-21 10:40:19,753 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-21 10:40:19,753 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-21 10:40:19,753 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:40:19,753 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-21 10:40:19,754 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-21 10:40:19,754 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 -> NOT_INCREMENTALLY [2020-07-21 10:40:20,050 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-21 10:40:20,062 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-21 10:40:20,066 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-21 10:40:20,067 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-21 10:40:20,067 INFO L275 PluginConnector]: CDTParser initialized [2020-07-21 10:40:20,068 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/bitvector/gcd_4.c [2020-07-21 10:40:20,131 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/587374918/d56c10a96eb641c1ba9ccbd94688319a/FLAG7c71c7c93 [2020-07-21 10:40:20,550 INFO L306 CDTParser]: Found 1 translation units. [2020-07-21 10:40:20,550 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/bitvector/gcd_4.c [2020-07-21 10:40:20,557 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/587374918/d56c10a96eb641c1ba9ccbd94688319a/FLAG7c71c7c93 [2020-07-21 10:40:20,954 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/587374918/d56c10a96eb641c1ba9ccbd94688319a [2020-07-21 10:40:20,965 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-21 10:40:20,969 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-21 10:40:20,972 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-21 10:40:20,972 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-21 10:40:20,976 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-21 10:40:20,977 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 10:40:20" (1/1) ... [2020-07-21 10:40:20,980 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@78559edb and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:40:20, skipping insertion in model container [2020-07-21 10:40:20,980 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 10:40:20" (1/1) ... [2020-07-21 10:40:20,989 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-21 10:40:21,010 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-21 10:40:21,216 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 10:40:21,220 INFO L203 MainTranslator]: Completed pre-run [2020-07-21 10:40:21,235 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 10:40:21,249 INFO L208 MainTranslator]: Completed translation [2020-07-21 10:40:21,249 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:40:21 WrapperNode [2020-07-21 10:40:21,250 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-21 10:40:21,250 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-21 10:40:21,251 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-21 10:40:21,251 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-21 10:40:21,260 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:40:21" (1/1) ... [2020-07-21 10:40:21,261 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:40:21" (1/1) ... [2020-07-21 10:40:21,265 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:40:21" (1/1) ... [2020-07-21 10:40:21,266 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:40:21" (1/1) ... [2020-07-21 10:40:21,269 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:40:21" (1/1) ... [2020-07-21 10:40:21,357 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:40:21" (1/1) ... [2020-07-21 10:40:21,359 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:40:21" (1/1) ... [2020-07-21 10:40:21,360 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-21 10:40:21,361 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-21 10:40:21,361 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-21 10:40:21,361 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-21 10:40:21,362 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:40:21" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 10:40:21,434 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-21 10:40:21,434 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-21 10:40:21,434 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-07-21 10:40:21,435 INFO L138 BoogieDeclarations]: Found implementation of procedure gcd_test [2020-07-21 10:40:21,435 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-21 10:40:21,435 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-21 10:40:21,435 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-21 10:40:21,436 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-07-21 10:40:21,437 INFO L130 BoogieDeclarations]: Found specification of procedure gcd_test [2020-07-21 10:40:21,437 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-21 10:40:21,438 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-21 10:40:21,438 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-21 10:40:21,621 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-21 10:40:21,622 INFO L295 CfgBuilder]: Removed 1 assume(true) statements. [2020-07-21 10:40:21,626 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 10:40:21 BoogieIcfgContainer [2020-07-21 10:40:21,626 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-21 10:40:21,627 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-21 10:40:21,627 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-21 10:40:21,630 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-21 10:40:21,631 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.07 10:40:20" (1/3) ... [2020-07-21 10:40:21,631 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1b012441 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 10:40:21, skipping insertion in model container [2020-07-21 10:40:21,632 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:40:21" (2/3) ... [2020-07-21 10:40:21,632 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1b012441 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 10:40:21, skipping insertion in model container [2020-07-21 10:40:21,632 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 10:40:21" (3/3) ... [2020-07-21 10:40:21,634 INFO L109 eAbstractionObserver]: Analyzing ICFG gcd_4.c [2020-07-21 10:40:21,644 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-21 10:40:21,651 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-21 10:40:21,673 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-21 10:40:21,736 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-21 10:40:21,737 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-21 10:40:21,737 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-21 10:40:21,737 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-21 10:40:21,740 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-21 10:40:21,740 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-21 10:40:21,741 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-21 10:40:21,741 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-21 10:40:21,764 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states. [2020-07-21 10:40:21,770 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2020-07-21 10:40:21,770 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 10:40:21,771 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 10:40:21,771 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 10:40:21,778 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 10:40:21,779 INFO L82 PathProgramCache]: Analyzing trace with hash 876608673, now seen corresponding path program 1 times [2020-07-21 10:40:21,785 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 10:40:21,786 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1469528142] [2020-07-21 10:40:21,786 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:40:21,845 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 10:40:21,848 INFO L263 TraceCheckSpWp]: Trace formula consists of 50 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-21 10:40:21,853 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 10:40:21,934 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 10:40:21,935 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 10:40:21,936 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1469528142] [2020-07-21 10:40:21,936 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 10:40:21,936 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-21 10:40:21,937 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1546706299] [2020-07-21 10:40:21,941 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-21 10:40:21,941 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 10:40:21,952 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-21 10:40:21,952 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-21 10:40:21,954 INFO L87 Difference]: Start difference. First operand 30 states. Second operand 5 states. [2020-07-21 10:40:22,065 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 10:40:22,066 INFO L93 Difference]: Finished difference Result 60 states and 81 transitions. [2020-07-21 10:40:22,066 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-21 10:40:22,068 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 17 [2020-07-21 10:40:22,068 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 10:40:22,079 INFO L225 Difference]: With dead ends: 60 [2020-07-21 10:40:22,080 INFO L226 Difference]: Without dead ends: 30 [2020-07-21 10:40:22,083 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 13 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-07-21 10:40:22,101 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-07-21 10:40:22,120 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 25. [2020-07-21 10:40:22,121 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2020-07-21 10:40:22,123 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 30 transitions. [2020-07-21 10:40:22,124 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 30 transitions. Word has length 17 [2020-07-21 10:40:22,125 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 10:40:22,125 INFO L479 AbstractCegarLoop]: Abstraction has 25 states and 30 transitions. [2020-07-21 10:40:22,125 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-21 10:40:22,125 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 30 transitions. [2020-07-21 10:40:22,127 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2020-07-21 10:40:22,127 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 10:40:22,127 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 10:40:22,337 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:40:22,337 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 10:40:22,338 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 10:40:22,339 INFO L82 PathProgramCache]: Analyzing trace with hash 483581663, now seen corresponding path program 1 times [2020-07-21 10:40:22,339 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 10:40:22,340 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [148704565] [2020-07-21 10:40:22,340 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:40:22,380 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 10:40:22,381 INFO L263 TraceCheckSpWp]: Trace formula consists of 48 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-21 10:40:22,384 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 10:40:22,422 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 10:40:22,422 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 10:40:22,422 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [148704565] [2020-07-21 10:40:22,423 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 10:40:22,423 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-21 10:40:22,423 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [831899570] [2020-07-21 10:40:22,425 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-21 10:40:22,425 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 10:40:22,426 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-21 10:40:22,426 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-21 10:40:22,426 INFO L87 Difference]: Start difference. First operand 25 states and 30 transitions. Second operand 5 states. [2020-07-21 10:40:22,483 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 10:40:22,484 INFO L93 Difference]: Finished difference Result 42 states and 50 transitions. [2020-07-21 10:40:22,485 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-21 10:40:22,485 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 17 [2020-07-21 10:40:22,485 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 10:40:22,486 INFO L225 Difference]: With dead ends: 42 [2020-07-21 10:40:22,487 INFO L226 Difference]: Without dead ends: 30 [2020-07-21 10:40:22,488 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 13 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-07-21 10:40:22,489 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-07-21 10:40:22,493 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 25. [2020-07-21 10:40:22,494 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2020-07-21 10:40:22,495 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 29 transitions. [2020-07-21 10:40:22,495 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 29 transitions. Word has length 17 [2020-07-21 10:40:22,496 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 10:40:22,496 INFO L479 AbstractCegarLoop]: Abstraction has 25 states and 29 transitions. [2020-07-21 10:40:22,496 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-21 10:40:22,496 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 29 transitions. [2020-07-21 10:40:22,497 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-07-21 10:40:22,497 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 10:40:22,498 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 10:40:22,713 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:40:22,713 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 10:40:22,714 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 10:40:22,715 INFO L82 PathProgramCache]: Analyzing trace with hash -1158269966, now seen corresponding path program 1 times [2020-07-21 10:40:22,715 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 10:40:22,717 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [268794497] [2020-07-21 10:40:22,717 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:40:22,751 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 10:40:22,753 INFO L263 TraceCheckSpWp]: Trace formula consists of 49 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-21 10:40:22,755 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 10:40:22,800 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 10:40:22,801 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 10:40:22,801 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [268794497] [2020-07-21 10:40:22,801 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 10:40:22,802 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-21 10:40:22,802 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1077969528] [2020-07-21 10:40:22,804 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-21 10:40:22,804 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 10:40:22,804 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-21 10:40:22,805 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-21 10:40:22,805 INFO L87 Difference]: Start difference. First operand 25 states and 29 transitions. Second operand 5 states. [2020-07-21 10:40:22,874 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 10:40:22,874 INFO L93 Difference]: Finished difference Result 46 states and 55 transitions. [2020-07-21 10:40:22,876 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-21 10:40:22,876 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 19 [2020-07-21 10:40:22,876 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 10:40:22,877 INFO L225 Difference]: With dead ends: 46 [2020-07-21 10:40:22,877 INFO L226 Difference]: Without dead ends: 30 [2020-07-21 10:40:22,878 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 15 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-07-21 10:40:22,879 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-07-21 10:40:22,887 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 25. [2020-07-21 10:40:22,888 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2020-07-21 10:40:22,889 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 28 transitions. [2020-07-21 10:40:22,889 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 28 transitions. Word has length 19 [2020-07-21 10:40:22,891 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 10:40:22,892 INFO L479 AbstractCegarLoop]: Abstraction has 25 states and 28 transitions. [2020-07-21 10:40:22,892 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-21 10:40:22,892 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 28 transitions. [2020-07-21 10:40:22,893 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-07-21 10:40:22,893 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 10:40:22,893 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 10:40:23,104 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:40:23,105 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 10:40:23,105 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 10:40:23,106 INFO L82 PathProgramCache]: Analyzing trace with hash -457205388, now seen corresponding path program 1 times [2020-07-21 10:40:23,107 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 10:40:23,107 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1860077454] [2020-07-21 10:40:23,108 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:40:23,135 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 10:40:23,136 INFO L263 TraceCheckSpWp]: Trace formula consists of 47 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-21 10:40:23,138 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 10:40:23,165 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 10:40:23,165 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 10:40:23,165 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1860077454] [2020-07-21 10:40:23,166 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 10:40:23,166 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-21 10:40:23,166 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1940283335] [2020-07-21 10:40:23,167 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-21 10:40:23,167 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 10:40:23,167 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-21 10:40:23,167 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-21 10:40:23,168 INFO L87 Difference]: Start difference. First operand 25 states and 28 transitions. Second operand 5 states. [2020-07-21 10:40:23,221 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 10:40:23,221 INFO L93 Difference]: Finished difference Result 40 states and 46 transitions. [2020-07-21 10:40:23,222 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-21 10:40:23,222 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 19 [2020-07-21 10:40:23,222 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 10:40:23,223 INFO L225 Difference]: With dead ends: 40 [2020-07-21 10:40:23,223 INFO L226 Difference]: Without dead ends: 27 [2020-07-21 10:40:23,224 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 15 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-07-21 10:40:23,225 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2020-07-21 10:40:23,233 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2020-07-21 10:40:23,233 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2020-07-21 10:40:23,237 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 31 transitions. [2020-07-21 10:40:23,238 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 31 transitions. Word has length 19 [2020-07-21 10:40:23,238 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 10:40:23,239 INFO L479 AbstractCegarLoop]: Abstraction has 27 states and 31 transitions. [2020-07-21 10:40:23,239 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-21 10:40:23,239 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 31 transitions. [2020-07-21 10:40:23,241 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-07-21 10:40:23,241 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 10:40:23,241 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] [2020-07-21 10:40:23,442 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:40:23,443 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 10:40:23,444 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 10:40:23,444 INFO L82 PathProgramCache]: Analyzing trace with hash -1431348209, now seen corresponding path program 1 times [2020-07-21 10:40:23,445 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 10:40:23,446 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2145836571] [2020-07-21 10:40:23,446 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:40:23,479 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 10:40:23,480 INFO L263 TraceCheckSpWp]: Trace formula consists of 51 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-21 10:40:23,484 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 10:40:23,535 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 10:40:23,535 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 10:40:23,668 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 10:40:23,668 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2145836571] [2020-07-21 10:40:23,669 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 10:40:23,669 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 9 [2020-07-21 10:40:23,669 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [983574444] [2020-07-21 10:40:23,670 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-07-21 10:40:23,671 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 10:40:23,671 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-07-21 10:40:23,671 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=52, Unknown=0, NotChecked=0, Total=72 [2020-07-21 10:40:23,672 INFO L87 Difference]: Start difference. First operand 27 states and 31 transitions. Second operand 9 states. [2020-07-21 10:40:23,777 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 10:40:23,779 INFO L93 Difference]: Finished difference Result 46 states and 56 transitions. [2020-07-21 10:40:23,779 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-21 10:40:23,779 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 21 [2020-07-21 10:40:23,780 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 10:40:23,780 INFO L225 Difference]: With dead ends: 46 [2020-07-21 10:40:23,781 INFO L226 Difference]: Without dead ends: 29 [2020-07-21 10:40:23,781 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 32 SyntacticMatches, 2 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=26, Invalid=64, Unknown=0, NotChecked=0, Total=90 [2020-07-21 10:40:23,782 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2020-07-21 10:40:23,793 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2020-07-21 10:40:23,793 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2020-07-21 10:40:23,794 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 33 transitions. [2020-07-21 10:40:23,795 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 33 transitions. Word has length 21 [2020-07-21 10:40:23,795 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 10:40:23,795 INFO L479 AbstractCegarLoop]: Abstraction has 29 states and 33 transitions. [2020-07-21 10:40:23,795 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-07-21 10:40:23,795 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 33 transitions. [2020-07-21 10:40:23,796 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2020-07-21 10:40:23,800 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 10:40:23,800 INFO L422 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 10:40:24,013 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:40:24,015 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 10:40:24,016 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 10:40:24,016 INFO L82 PathProgramCache]: Analyzing trace with hash -1537894100, now seen corresponding path program 1 times [2020-07-21 10:40:24,017 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 10:40:24,017 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [85375707] [2020-07-21 10:40:24,018 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:40:24,039 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 10:40:24,041 INFO L263 TraceCheckSpWp]: Trace formula consists of 55 conjuncts, 9 conjunts are in the unsatisfiable core [2020-07-21 10:40:24,042 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 10:40:24,207 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 10:40:24,207 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 10:40:24,298 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [85375707] [2020-07-21 10:40:24,298 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-21 10:40:24,299 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-07-21 10:40:24,299 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [792500531] [2020-07-21 10:40:24,299 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-07-21 10:40:24,300 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 10:40:24,300 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-07-21 10:40:24,300 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2020-07-21 10:40:24,300 INFO L87 Difference]: Start difference. First operand 29 states and 33 transitions. Second operand 7 states. [2020-07-21 10:40:24,465 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 10:40:24,465 INFO L93 Difference]: Finished difference Result 48 states and 58 transitions. [2020-07-21 10:40:24,468 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-21 10:40:24,469 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 23 [2020-07-21 10:40:24,469 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 10:40:24,470 INFO L225 Difference]: With dead ends: 48 [2020-07-21 10:40:24,470 INFO L226 Difference]: Without dead ends: 31 [2020-07-21 10:40:24,473 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 22 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=22, Invalid=68, Unknown=0, NotChecked=0, Total=90 [2020-07-21 10:40:24,474 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2020-07-21 10:40:24,478 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 31. [2020-07-21 10:40:24,478 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-07-21 10:40:24,479 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 35 transitions. [2020-07-21 10:40:24,479 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 35 transitions. Word has length 23 [2020-07-21 10:40:24,479 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 10:40:24,479 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 35 transitions. [2020-07-21 10:40:24,480 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-07-21 10:40:24,480 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 35 transitions. [2020-07-21 10:40:24,480 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-07-21 10:40:24,480 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 10:40:24,480 INFO L422 BasicCegarLoop]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 10:40:24,681 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:40:24,682 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 10:40:24,682 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 10:40:24,683 INFO L82 PathProgramCache]: Analyzing trace with hash -849280247, now seen corresponding path program 2 times [2020-07-21 10:40:24,683 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 10:40:24,684 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1661605566] [2020-07-21 10:40:24,684 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:40:24,706 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 10:40:24,708 INFO L263 TraceCheckSpWp]: Trace formula consists of 59 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-21 10:40:24,710 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 10:40:24,847 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 10:40:24,847 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 10:40:24,962 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1661605566] [2020-07-21 10:40:24,963 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-21 10:40:24,963 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-07-21 10:40:24,963 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [926708095] [2020-07-21 10:40:24,964 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-07-21 10:40:24,964 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 10:40:24,965 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-07-21 10:40:24,965 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=56, Unknown=0, NotChecked=0, Total=72 [2020-07-21 10:40:24,965 INFO L87 Difference]: Start difference. First operand 31 states and 35 transitions. Second operand 8 states. [2020-07-21 10:40:25,155 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 10:40:25,155 INFO L93 Difference]: Finished difference Result 50 states and 60 transitions. [2020-07-21 10:40:25,156 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-21 10:40:25,156 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 25 [2020-07-21 10:40:25,157 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 10:40:25,157 INFO L225 Difference]: With dead ends: 50 [2020-07-21 10:40:25,157 INFO L226 Difference]: Without dead ends: 33 [2020-07-21 10:40:25,158 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 23 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2020-07-21 10:40:25,159 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2020-07-21 10:40:25,163 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2020-07-21 10:40:25,163 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2020-07-21 10:40:25,164 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 37 transitions. [2020-07-21 10:40:25,164 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 37 transitions. Word has length 25 [2020-07-21 10:40:25,165 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 10:40:25,165 INFO L479 AbstractCegarLoop]: Abstraction has 33 states and 37 transitions. [2020-07-21 10:40:25,165 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-07-21 10:40:25,165 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 37 transitions. [2020-07-21 10:40:25,166 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-07-21 10:40:25,166 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 10:40:25,166 INFO L422 BasicCegarLoop]: trace histogram [4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 10:40:25,367 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:40:25,368 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 10:40:25,368 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 10:40:25,368 INFO L82 PathProgramCache]: Analyzing trace with hash -516331098, now seen corresponding path program 3 times [2020-07-21 10:40:25,369 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 10:40:25,370 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1574828787] [2020-07-21 10:40:25,370 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 [2020-07-21 10:40:25,393 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 10:40:25,394 INFO L263 TraceCheckSpWp]: Trace formula consists of 63 conjuncts, 11 conjunts are in the unsatisfiable core [2020-07-21 10:40:25,396 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 10:40:25,530 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 10:40:25,530 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 10:40:25,635 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1574828787] [2020-07-21 10:40:25,635 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-21 10:40:25,635 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-07-21 10:40:25,635 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1225815937] [2020-07-21 10:40:25,636 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-07-21 10:40:25,636 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 10:40:25,636 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-07-21 10:40:25,636 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=72, Unknown=0, NotChecked=0, Total=90 [2020-07-21 10:40:25,636 INFO L87 Difference]: Start difference. First operand 33 states and 37 transitions. Second operand 9 states. [2020-07-21 10:40:25,797 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 10:40:25,798 INFO L93 Difference]: Finished difference Result 52 states and 62 transitions. [2020-07-21 10:40:25,799 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-21 10:40:25,800 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 27 [2020-07-21 10:40:25,800 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 10:40:25,801 INFO L225 Difference]: With dead ends: 52 [2020-07-21 10:40:25,801 INFO L226 Difference]: Without dead ends: 35 [2020-07-21 10:40:25,801 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 24 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=26, Invalid=106, Unknown=0, NotChecked=0, Total=132 [2020-07-21 10:40:25,802 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2020-07-21 10:40:25,806 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 35. [2020-07-21 10:40:25,806 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-07-21 10:40:25,807 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 39 transitions. [2020-07-21 10:40:25,807 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 39 transitions. Word has length 27 [2020-07-21 10:40:25,808 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 10:40:25,808 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 39 transitions. [2020-07-21 10:40:25,808 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-07-21 10:40:25,808 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 39 transitions. [2020-07-21 10:40:25,809 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2020-07-21 10:40:25,809 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 10:40:25,809 INFO L422 BasicCegarLoop]: trace histogram [5, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 10:40:26,024 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:40:26,026 INFO L427 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 10:40:26,026 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 10:40:26,026 INFO L82 PathProgramCache]: Analyzing trace with hash 1878386625, now seen corresponding path program 4 times [2020-07-21 10:40:26,027 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 10:40:26,027 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [45523491] [2020-07-21 10:40:26,028 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 [2020-07-21 10:40:26,057 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 10:40:26,058 INFO L263 TraceCheckSpWp]: Trace formula consists of 67 conjuncts, 27 conjunts are in the unsatisfiable core [2020-07-21 10:40:26,060 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 10:40:26,191 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-07-21 10:40:26,191 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 10:40:26,221 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:40:26,225 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:40:26,225 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:40:26,229 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:40:26,230 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:40:26,232 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:40:26,234 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:40:29,909 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-07-21 10:40:29,909 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [45523491] [2020-07-21 10:40:29,910 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 10:40:29,910 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12] total 20 [2020-07-21 10:40:29,910 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [507515643] [2020-07-21 10:40:29,911 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-07-21 10:40:29,911 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 10:40:29,911 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-07-21 10:40:29,912 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=335, Unknown=1, NotChecked=0, Total=380 [2020-07-21 10:40:29,912 INFO L87 Difference]: Start difference. First operand 35 states and 39 transitions. Second operand 20 states. [2020-07-21 10:40:31,648 WARN L193 SmtUtils]: Spent 722.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 8 [2020-07-21 10:40:39,849 WARN L193 SmtUtils]: Spent 4.36 s on a formula simplification that was a NOOP. DAG size: 28 [2020-07-21 10:40:42,568 WARN L193 SmtUtils]: Spent 1.43 s on a formula simplification that was a NOOP. DAG size: 31 [2020-07-21 10:40:43,860 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 10:40:43,861 INFO L93 Difference]: Finished difference Result 52 states and 60 transitions. [2020-07-21 10:40:43,862 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-21 10:40:43,863 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 29 [2020-07-21 10:40:43,863 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 10:40:43,864 INFO L225 Difference]: With dead ends: 52 [2020-07-21 10:40:43,864 INFO L226 Difference]: Without dead ends: 39 [2020-07-21 10:40:43,865 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 64 GetRequests, 37 SyntacticMatches, 2 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 47 ImplicationChecksByTransitivity, 12.4s TimeCoverageRelationStatistics Valid=84, Invalid=617, Unknown=1, NotChecked=0, Total=702 [2020-07-21 10:40:43,866 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2020-07-21 10:40:43,871 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2020-07-21 10:40:43,871 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2020-07-21 10:40:43,871 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 45 transitions. [2020-07-21 10:40:43,872 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 45 transitions. Word has length 29 [2020-07-21 10:40:43,872 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 10:40:43,872 INFO L479 AbstractCegarLoop]: Abstraction has 39 states and 45 transitions. [2020-07-21 10:40:43,872 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-07-21 10:40:43,872 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 45 transitions. [2020-07-21 10:40:43,873 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2020-07-21 10:40:43,873 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 10:40:43,873 INFO L422 BasicCegarLoop]: trace histogram [6, 4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 10:40:44,074 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:40:44,075 INFO L427 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 10:40:44,075 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 10:40:44,076 INFO L82 PathProgramCache]: Analyzing trace with hash 841482334, now seen corresponding path program 5 times [2020-07-21 10:40:44,076 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 10:40:44,077 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1940564061] [2020-07-21 10:40:44,077 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 [2020-07-21 10:40:44,100 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 10:40:44,101 INFO L263 TraceCheckSpWp]: Trace formula consists of 71 conjuncts, 11 conjunts are in the unsatisfiable core [2020-07-21 10:40:44,103 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 10:40:44,410 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 35 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-21 10:40:44,410 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 10:40:44,586 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1940564061] [2020-07-21 10:40:44,586 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-21 10:40:44,586 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-07-21 10:40:44,586 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1885129807] [2020-07-21 10:40:44,587 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-07-21 10:40:44,587 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 10:40:44,587 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-07-21 10:40:44,588 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=72, Unknown=0, NotChecked=0, Total=90 [2020-07-21 10:40:44,588 INFO L87 Difference]: Start difference. First operand 39 states and 45 transitions. Second operand 9 states. [2020-07-21 10:40:51,420 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 10:40:51,420 INFO L93 Difference]: Finished difference Result 54 states and 63 transitions. [2020-07-21 10:40:51,424 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-21 10:40:51,424 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 31 [2020-07-21 10:40:51,425 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 10:40:51,426 INFO L225 Difference]: With dead ends: 54 [2020-07-21 10:40:51,426 INFO L226 Difference]: Without dead ends: 37 [2020-07-21 10:40:51,427 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 28 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=22, Invalid=88, Unknown=0, NotChecked=0, Total=110 [2020-07-21 10:40:51,427 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2020-07-21 10:40:51,431 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37. [2020-07-21 10:40:51,431 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2020-07-21 10:40:51,432 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 41 transitions. [2020-07-21 10:40:51,432 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 41 transitions. Word has length 31 [2020-07-21 10:40:51,433 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 10:40:51,433 INFO L479 AbstractCegarLoop]: Abstraction has 37 states and 41 transitions. [2020-07-21 10:40:51,433 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-07-21 10:40:51,433 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 41 transitions. [2020-07-21 10:40:51,434 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2020-07-21 10:40:51,434 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 10:40:51,434 INFO L422 BasicCegarLoop]: trace histogram [6, 4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 10:40:51,639 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:40:51,640 INFO L427 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 10:40:51,641 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 10:40:51,641 INFO L82 PathProgramCache]: Analyzing trace with hash 1492674782, now seen corresponding path program 6 times [2020-07-21 10:40:51,641 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 10:40:51,642 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [721813876] [2020-07-21 10:40:51,642 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 [2020-07-21 10:40:51,667 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 10:40:51,668 INFO L263 TraceCheckSpWp]: Trace formula consists of 71 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 10:40:51,669 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 10:40:51,677 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 11 proven. 0 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2020-07-21 10:40:51,677 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 10:40:51,678 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [721813876] [2020-07-21 10:40:51,678 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 10:40:51,678 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 10:40:51,678 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1480595391] [2020-07-21 10:40:51,679 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 10:40:51,679 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 10:40:51,679 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 10:40:51,679 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 10:40:51,680 INFO L87 Difference]: Start difference. First operand 37 states and 41 transitions. Second operand 3 states. [2020-07-21 10:40:51,695 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 10:40:51,695 INFO L93 Difference]: Finished difference Result 51 states and 57 transitions. [2020-07-21 10:40:51,699 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 10:40:51,699 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 31 [2020-07-21 10:40:51,699 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 10:40:51,700 INFO L225 Difference]: With dead ends: 51 [2020-07-21 10:40:51,700 INFO L226 Difference]: Without dead ends: 38 [2020-07-21 10:40:51,701 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 [2020-07-21 10:40:51,701 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-07-21 10:40:51,705 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 38. [2020-07-21 10:40:51,706 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2020-07-21 10:40:51,707 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 42 transitions. [2020-07-21 10:40:51,707 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 42 transitions. Word has length 31 [2020-07-21 10:40:51,707 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 10:40:51,707 INFO L479 AbstractCegarLoop]: Abstraction has 38 states and 42 transitions. [2020-07-21 10:40:51,707 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 10:40:51,707 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 42 transitions. [2020-07-21 10:40:51,708 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2020-07-21 10:40:51,708 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 10:40:51,708 INFO L422 BasicCegarLoop]: trace histogram [7, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 10:40:51,920 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:40:51,921 INFO L427 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 10:40:51,922 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 10:40:51,922 INFO L82 PathProgramCache]: Analyzing trace with hash -202245895, now seen corresponding path program 7 times [2020-07-21 10:40:51,922 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 10:40:51,923 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [541912068] [2020-07-21 10:40:51,923 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 [2020-07-21 10:40:51,946 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 10:40:51,947 INFO L263 TraceCheckSpWp]: Trace formula consists of 75 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-21 10:40:51,948 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 10:40:54,506 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 0 proven. 49 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 10:40:54,506 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 10:40:54,940 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [541912068] [2020-07-21 10:40:54,940 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-21 10:40:54,940 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2020-07-21 10:40:54,940 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1099393854] [2020-07-21 10:40:54,941 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-21 10:40:54,941 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 10:40:54,941 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-21 10:40:54,942 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=131, Unknown=1, NotChecked=0, Total=156 [2020-07-21 10:40:54,942 INFO L87 Difference]: Start difference. First operand 38 states and 42 transitions. Second operand 12 states. [2020-07-21 10:40:59,290 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 10:40:59,290 INFO L93 Difference]: Finished difference Result 63 states and 75 transitions. [2020-07-21 10:40:59,295 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-21 10:40:59,295 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 33 [2020-07-21 10:40:59,296 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 10:40:59,297 INFO L225 Difference]: With dead ends: 63 [2020-07-21 10:40:59,297 INFO L226 Difference]: Without dead ends: 40 [2020-07-21 10:40:59,298 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 27 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 5.0s TimeCoverageRelationStatistics Valid=50, Invalid=254, Unknown=2, NotChecked=0, Total=306 [2020-07-21 10:40:59,298 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2020-07-21 10:40:59,309 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 40. [2020-07-21 10:40:59,310 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2020-07-21 10:40:59,310 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 43 transitions. [2020-07-21 10:40:59,310 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 43 transitions. Word has length 33 [2020-07-21 10:40:59,311 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 10:40:59,311 INFO L479 AbstractCegarLoop]: Abstraction has 40 states and 43 transitions. [2020-07-21 10:40:59,311 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-21 10:40:59,311 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 43 transitions. [2020-07-21 10:40:59,313 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2020-07-21 10:40:59,313 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 10:40:59,313 INFO L422 BasicCegarLoop]: trace histogram [8, 5, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 10:40:59,530 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:40:59,531 INFO L427 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 10:40:59,532 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 10:40:59,532 INFO L82 PathProgramCache]: Analyzing trace with hash -1486576746, now seen corresponding path program 8 times [2020-07-21 10:40:59,532 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 10:40:59,533 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [967958778] [2020-07-21 10:40:59,533 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 [2020-07-21 10:40:59,558 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 10:40:59,559 INFO L263 TraceCheckSpWp]: Trace formula consists of 79 conjuncts, 15 conjunts are in the unsatisfiable core [2020-07-21 10:40:59,562 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 10:41:07,332 WARN L860 $PredicateComparison]: unable to prove that (exists ((v_gcd_test_~a_103 Int)) (and (<= (div (+ v_gcd_test_~a_103 (* |c_gcd_test_#in~a| (- 1))) (- 3)) |c_gcd_test_#in~b|) (<= (+ (* 2 v_gcd_test_~a_103) (div (+ (* v_gcd_test_~a_103 (- 1)) (* c_gcd_test_~b (- 1))) (- 3))) |c_gcd_test_#in~b|))) is different from true [2020-07-21 10:41:07,565 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 0 proven. 56 refuted. 0 times theorem prover too weak. 0 trivial. 8 not checked. [2020-07-21 10:41:07,566 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 10:41:08,002 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [967958778] [2020-07-21 10:41:08,003 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-21 10:41:08,003 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-07-21 10:41:08,003 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1650814115] [2020-07-21 10:41:08,003 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-07-21 10:41:08,004 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 10:41:08,004 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-07-21 10:41:08,004 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=131, Unknown=3, NotChecked=22, Total=182 [2020-07-21 10:41:08,005 INFO L87 Difference]: Start difference. First operand 40 states and 43 transitions. Second operand 13 states. [2020-07-21 10:41:29,053 WARN L193 SmtUtils]: Spent 2.06 s on a formula simplification that was a NOOP. DAG size: 25 [2020-07-21 10:41:29,328 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 10:41:29,329 INFO L93 Difference]: Finished difference Result 59 states and 67 transitions. [2020-07-21 10:41:29,333 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-21 10:41:29,334 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 35 [2020-07-21 10:41:29,334 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 10:41:29,335 INFO L225 Difference]: With dead ends: 59 [2020-07-21 10:41:29,335 INFO L226 Difference]: Without dead ends: 42 [2020-07-21 10:41:29,337 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 28 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 19.3s TimeCoverageRelationStatistics Valid=57, Invalid=282, Unknown=7, NotChecked=34, Total=380 [2020-07-21 10:41:29,338 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2020-07-21 10:41:29,346 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 42. [2020-07-21 10:41:29,346 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2020-07-21 10:41:29,348 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 45 transitions. [2020-07-21 10:41:29,348 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 45 transitions. Word has length 35 [2020-07-21 10:41:29,349 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 10:41:29,349 INFO L479 AbstractCegarLoop]: Abstraction has 42 states and 45 transitions. [2020-07-21 10:41:29,349 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-07-21 10:41:29,349 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 45 transitions. [2020-07-21 10:41:29,354 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2020-07-21 10:41:29,354 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 10:41:29,354 INFO L422 BasicCegarLoop]: trace histogram [9, 6, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 10:41:29,555 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:41:29,556 INFO L427 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 10:41:29,556 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 10:41:29,556 INFO L82 PathProgramCache]: Analyzing trace with hash 1222056691, now seen corresponding path program 9 times [2020-07-21 10:41:29,557 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 10:41:29,557 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1613154010] [2020-07-21 10:41:29,558 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 [2020-07-21 10:41:29,586 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 10:41:29,588 INFO L263 TraceCheckSpWp]: Trace formula consists of 83 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-21 10:41:29,589 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 10:41:33,296 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 0 proven. 81 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 10:41:33,297 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 10:41:33,973 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1613154010] [2020-07-21 10:41:33,973 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-21 10:41:33,973 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14] total 14 [2020-07-21 10:41:33,973 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [594198301] [2020-07-21 10:41:33,974 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-07-21 10:41:33,974 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 10:41:33,974 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-07-21 10:41:33,974 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=181, Unknown=1, NotChecked=0, Total=210 [2020-07-21 10:41:33,974 INFO L87 Difference]: Start difference. First operand 42 states and 45 transitions. Second operand 14 states. [2020-07-21 10:41:52,259 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 37 DAG size of output: 28 [2020-07-21 10:41:56,689 WARN L193 SmtUtils]: Spent 141.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 26 [2020-07-21 10:42:05,979 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 10:42:05,979 INFO L93 Difference]: Finished difference Result 60 states and 67 transitions. [2020-07-21 10:42:05,986 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-07-21 10:42:05,986 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 37 [2020-07-21 10:42:05,986 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 10:42:05,987 INFO L225 Difference]: With dead ends: 60 [2020-07-21 10:42:05,987 INFO L226 Difference]: Without dead ends: 47 [2020-07-21 10:42:05,988 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 29 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 21 ImplicationChecksByTransitivity, 11.3s TimeCoverageRelationStatistics Valid=68, Invalid=390, Unknown=4, NotChecked=0, Total=462 [2020-07-21 10:42:05,989 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2020-07-21 10:42:05,995 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 44. [2020-07-21 10:42:05,995 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2020-07-21 10:42:05,997 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 48 transitions. [2020-07-21 10:42:05,997 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 48 transitions. Word has length 37 [2020-07-21 10:42:05,998 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 10:42:05,998 INFO L479 AbstractCegarLoop]: Abstraction has 44 states and 48 transitions. [2020-07-21 10:42:05,998 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-07-21 10:42:05,998 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 48 transitions. [2020-07-21 10:42:06,001 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2020-07-21 10:42:06,001 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 10:42:06,001 INFO L422 BasicCegarLoop]: trace histogram [10, 7, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 10:42:06,202 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:42:06,202 INFO L427 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 10:42:06,203 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 10:42:06,203 INFO L82 PathProgramCache]: Analyzing trace with hash 1468608272, now seen corresponding path program 10 times [2020-07-21 10:42:06,203 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 10:42:06,204 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [925118188] [2020-07-21 10:42:06,204 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 [2020-07-21 10:42:06,235 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 10:42:06,236 INFO L263 TraceCheckSpWp]: Trace formula consists of 87 conjuncts, 17 conjunts are in the unsatisfiable core [2020-07-21 10:42:06,237 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 10:42:15,978 WARN L860 $PredicateComparison]: unable to prove that (exists ((v_gcd_test_~a_153 Int)) (and (<= (div (+ v_gcd_test_~a_153 (* |c_gcd_test_#in~a| (- 1))) (- 3)) |c_gcd_test_#in~b|) (<= (+ (div (+ (* v_gcd_test_~a_153 (- 1)) (* c_gcd_test_~b (- 1))) (- 5)) (* 2 v_gcd_test_~a_153)) |c_gcd_test_#in~b|))) is different from true [2020-07-21 10:42:16,350 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 90 refuted. 0 times theorem prover too weak. 0 trivial. 10 not checked. [2020-07-21 10:42:16,351 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 10:42:17,005 WARN L193 SmtUtils]: Spent 117.00 ms on a formula simplification that was a NOOP. DAG size: 48 [2020-07-21 10:42:17,120 WARN L193 SmtUtils]: Spent 113.00 ms on a formula simplification that was a NOOP. DAG size: 42 [2020-07-21 10:42:17,424 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [925118188] [2020-07-21 10:42:17,424 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-21 10:42:17,425 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2020-07-21 10:42:17,425 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1463171282] [2020-07-21 10:42:17,425 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-21 10:42:17,426 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 10:42:17,426 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-21 10:42:17,427 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=180, Unknown=4, NotChecked=26, Total=240 [2020-07-21 10:42:17,427 INFO L87 Difference]: Start difference. First operand 44 states and 48 transitions. Second operand 15 states. [2020-07-21 10:42:35,774 WARN L193 SmtUtils]: Spent 173.00 ms on a formula simplification. DAG size of input: 43 DAG size of output: 28 [2020-07-21 10:42:38,796 WARN L193 SmtUtils]: Spent 247.00 ms on a formula simplification. DAG size of input: 37 DAG size of output: 26 [2020-07-21 10:42:39,444 WARN L193 SmtUtils]: Spent 306.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 27 [2020-07-21 10:42:47,063 WARN L193 SmtUtils]: Spent 2.09 s on a formula simplification that was a NOOP. DAG size: 26 [2020-07-21 10:42:50,087 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 10:42:50,087 INFO L93 Difference]: Finished difference Result 64 states and 73 transitions. [2020-07-21 10:42:50,097 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-07-21 10:42:50,097 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 39 [2020-07-21 10:42:50,097 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 10:42:50,098 INFO L225 Difference]: With dead ends: 64 [2020-07-21 10:42:50,098 INFO L226 Difference]: Without dead ends: 46 [2020-07-21 10:42:50,099 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 30 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 23.4s TimeCoverageRelationStatistics Valid=79, Invalid=423, Unknown=8, NotChecked=42, Total=552 [2020-07-21 10:42:50,099 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2020-07-21 10:42:50,106 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 46. [2020-07-21 10:42:50,107 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-07-21 10:42:50,107 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 49 transitions. [2020-07-21 10:42:50,107 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 49 transitions. Word has length 39 [2020-07-21 10:42:50,110 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 10:42:50,110 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 49 transitions. [2020-07-21 10:42:50,110 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-21 10:42:50,111 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 49 transitions. [2020-07-21 10:42:50,111 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-07-21 10:42:50,111 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 10:42:50,111 INFO L422 BasicCegarLoop]: trace histogram [11, 8, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 10:42:50,312 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:42:50,313 INFO L427 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 10:42:50,313 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 10:42:50,313 INFO L82 PathProgramCache]: Analyzing trace with hash -2113490963, now seen corresponding path program 11 times [2020-07-21 10:42:50,314 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 10:42:50,314 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1682610893] [2020-07-21 10:42:50,314 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 [2020-07-21 10:42:50,343 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 10:42:50,344 INFO L263 TraceCheckSpWp]: Trace formula consists of 91 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-21 10:42:50,346 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 10:43:04,509 INFO L134 CoverageAnalysis]: Checked inductivity of 121 backedges. 0 proven. 121 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 10:43:04,509 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 10:43:04,613 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 42 [2020-07-21 10:43:04,719 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 42 [2020-07-21 10:43:04,842 WARN L193 SmtUtils]: Spent 119.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2020-07-21 10:43:04,974 WARN L193 SmtUtils]: Spent 129.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2020-07-21 10:43:05,090 WARN L193 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 58 [2020-07-21 10:43:05,201 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 56 [2020-07-21 10:43:05,384 WARN L193 SmtUtils]: Spent 180.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2020-07-21 10:43:05,558 WARN L193 SmtUtils]: Spent 171.00 ms on a formula simplification that was a NOOP. DAG size: 50 [2020-07-21 10:43:05,727 WARN L193 SmtUtils]: Spent 166.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2020-07-21 10:43:05,876 WARN L193 SmtUtils]: Spent 146.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2020-07-21 10:43:06,363 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1682610893] [2020-07-21 10:43:06,363 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-21 10:43:06,364 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16] total 16 [2020-07-21 10:43:06,364 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [492742574] [2020-07-21 10:43:06,365 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-07-21 10:43:06,365 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 10:43:06,365 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-07-21 10:43:06,365 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=236, Unknown=4, NotChecked=0, Total=272 [2020-07-21 10:43:06,366 INFO L87 Difference]: Start difference. First operand 46 states and 49 transitions. Second operand 16 states. [2020-07-21 10:43:38,846 WARN L193 SmtUtils]: Spent 226.00 ms on a formula simplification. DAG size of input: 49 DAG size of output: 28 [2020-07-21 10:43:41,982 WARN L193 SmtUtils]: Spent 353.00 ms on a formula simplification. DAG size of input: 43 DAG size of output: 26 [2020-07-21 10:43:42,641 WARN L193 SmtUtils]: Spent 283.00 ms on a formula simplification. DAG size of input: 39 DAG size of output: 27 [2020-07-21 10:43:45,314 WARN L193 SmtUtils]: Spent 302.00 ms on a formula simplification. DAG size of input: 34 DAG size of output: 28 [2020-07-21 10:43:49,914 WARN L193 SmtUtils]: Spent 162.00 ms on a formula simplification that was a NOOP. DAG size: 28 [2020-07-21 10:43:56,041 WARN L193 SmtUtils]: Spent 137.00 ms on a formula simplification that was a NOOP. DAG size: 28 [2020-07-21 10:44:00,354 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 10:44:00,354 INFO L93 Difference]: Finished difference Result 67 states and 76 transitions. [2020-07-21 10:44:00,368 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-07-21 10:44:00,368 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 41 [2020-07-21 10:44:00,368 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 10:44:00,369 INFO L225 Difference]: With dead ends: 67 [2020-07-21 10:44:00,369 INFO L226 Difference]: Without dead ends: 48 [2020-07-21 10:44:00,370 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 31 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 36 ImplicationChecksByTransitivity, 29.1s TimeCoverageRelationStatistics Valid=94, Invalid=547, Unknown=9, NotChecked=0, Total=650 [2020-07-21 10:44:00,370 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2020-07-21 10:44:00,375 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 48. [2020-07-21 10:44:00,375 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2020-07-21 10:44:00,376 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 51 transitions. [2020-07-21 10:44:00,376 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 51 transitions. Word has length 41 [2020-07-21 10:44:00,376 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 10:44:00,376 INFO L479 AbstractCegarLoop]: Abstraction has 48 states and 51 transitions. [2020-07-21 10:44:00,377 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-07-21 10:44:00,377 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 51 transitions. [2020-07-21 10:44:00,377 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2020-07-21 10:44:00,377 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 10:44:00,377 INFO L422 BasicCegarLoop]: trace histogram [12, 9, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 10:44:00,584 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:44:00,584 INFO L427 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 10:44:00,584 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 10:44:00,585 INFO L82 PathProgramCache]: Analyzing trace with hash 52915594, now seen corresponding path program 12 times [2020-07-21 10:44:00,585 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 10:44:00,586 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [417417157] [2020-07-21 10:44:00,586 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 [2020-07-21 10:44:00,617 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 10:44:00,619 INFO L263 TraceCheckSpWp]: Trace formula consists of 95 conjuncts, 19 conjunts are in the unsatisfiable core [2020-07-21 10:44:00,620 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 10:44:17,641 INFO L134 CoverageAnalysis]: Checked inductivity of 144 backedges. 0 proven. 144 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 10:44:17,642 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 10:44:17,810 WARN L193 SmtUtils]: Spent 166.00 ms on a formula simplification that was a NOOP. DAG size: 45 [2020-07-21 10:44:17,976 WARN L193 SmtUtils]: Spent 162.00 ms on a formula simplification that was a NOOP. DAG size: 45 [2020-07-21 10:44:18,155 WARN L193 SmtUtils]: Spent 174.00 ms on a formula simplification that was a NOOP. DAG size: 49 [2020-07-21 10:44:18,325 WARN L193 SmtUtils]: Spent 166.00 ms on a formula simplification that was a NOOP. DAG size: 49 [2020-07-21 10:44:18,489 WARN L193 SmtUtils]: Spent 157.00 ms on a formula simplification that was a NOOP. DAG size: 63 [2020-07-21 10:44:18,770 WARN L193 SmtUtils]: Spent 278.00 ms on a formula simplification that was a NOOP. DAG size: 62 [2020-07-21 10:44:19,029 WARN L193 SmtUtils]: Spent 255.00 ms on a formula simplification that was a NOOP. DAG size: 57 [2020-07-21 10:44:19,268 WARN L193 SmtUtils]: Spent 235.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2020-07-21 10:44:19,500 WARN L193 SmtUtils]: Spent 228.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2020-07-21 10:44:19,734 WARN L193 SmtUtils]: Spent 228.00 ms on a formula simplification that was a NOOP. DAG size: 48 [2020-07-21 10:44:19,931 WARN L193 SmtUtils]: Spent 194.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2020-07-21 10:44:20,778 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [417417157] [2020-07-21 10:44:20,779 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-21 10:44:20,779 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17] total 17 [2020-07-21 10:44:20,779 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [569205744] [2020-07-21 10:44:20,779 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-21 10:44:20,780 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 10:44:20,780 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-21 10:44:20,780 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=266, Unknown=6, NotChecked=0, Total=306 [2020-07-21 10:44:20,780 INFO L87 Difference]: Start difference. First operand 48 states and 51 transitions. Second operand 17 states. [2020-07-21 10:44:37,774 WARN L193 SmtUtils]: Spent 265.00 ms on a formula simplification. DAG size of input: 55 DAG size of output: 28 [2020-07-21 10:44:41,812 WARN L193 SmtUtils]: Spent 482.00 ms on a formula simplification. DAG size of input: 49 DAG size of output: 26 [2020-07-21 10:44:44,681 WARN L193 SmtUtils]: Spent 296.00 ms on a formula simplification. DAG size of input: 45 DAG size of output: 27 [2020-07-21 10:44:49,579 WARN L193 SmtUtils]: Spent 370.00 ms on a formula simplification. DAG size of input: 40 DAG size of output: 28 [2020-07-21 10:44:52,474 WARN L193 SmtUtils]: Spent 295.00 ms on a formula simplification. DAG size of input: 34 DAG size of output: 28 [2020-07-21 10:44:54,733 WARN L193 SmtUtils]: Spent 236.00 ms on a formula simplification that was a NOOP. DAG size: 28 [2020-07-21 10:45:02,337 WARN L193 SmtUtils]: Spent 214.00 ms on a formula simplification that was a NOOP. DAG size: 28 [2020-07-21 10:45:10,772 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 10:45:10,772 INFO L93 Difference]: Finished difference Result 69 states and 78 transitions. [2020-07-21 10:45:10,803 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-07-21 10:45:10,803 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 43 [2020-07-21 10:45:10,804 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 10:45:10,805 INFO L225 Difference]: With dead ends: 69 [2020-07-21 10:45:10,805 INFO L226 Difference]: Without dead ends: 50 [2020-07-21 10:45:10,806 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 32 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 45 ImplicationChecksByTransitivity, 31.1s TimeCoverageRelationStatistics Valid=110, Invalid=637, Unknown=9, NotChecked=0, Total=756 [2020-07-21 10:45:10,806 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2020-07-21 10:45:10,812 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 50. [2020-07-21 10:45:10,812 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 50 states. [2020-07-21 10:45:10,813 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 53 transitions. [2020-07-21 10:45:10,813 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 53 transitions. Word has length 43 [2020-07-21 10:45:10,813 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 10:45:10,814 INFO L479 AbstractCegarLoop]: Abstraction has 50 states and 53 transitions. [2020-07-21 10:45:10,814 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-21 10:45:10,814 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 53 transitions. [2020-07-21 10:45:10,814 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2020-07-21 10:45:10,815 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 10:45:10,815 INFO L422 BasicCegarLoop]: trace histogram [13, 10, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 10:45:11,029 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:45:11,030 INFO L427 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 10:45:11,030 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 10:45:11,030 INFO L82 PathProgramCache]: Analyzing trace with hash -1089521689, now seen corresponding path program 13 times [2020-07-21 10:45:11,031 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 10:45:11,031 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [700096312] [2020-07-21 10:45:11,031 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 [2020-07-21 10:45:11,070 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 10:45:11,071 INFO L263 TraceCheckSpWp]: Trace formula consists of 99 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-21 10:45:11,073 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 10:45:33,143 INFO L134 CoverageAnalysis]: Checked inductivity of 169 backedges. 0 proven. 169 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 10:45:33,143 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 10:45:33,308 WARN L193 SmtUtils]: Spent 162.00 ms on a formula simplification that was a NOOP. DAG size: 48 [2020-07-21 10:45:33,479 WARN L193 SmtUtils]: Spent 167.00 ms on a formula simplification that was a NOOP. DAG size: 48 [2020-07-21 10:45:33,668 WARN L193 SmtUtils]: Spent 185.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2020-07-21 10:45:33,853 WARN L193 SmtUtils]: Spent 181.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2020-07-21 10:45:34,066 WARN L193 SmtUtils]: Spent 197.00 ms on a formula simplification that was a NOOP. DAG size: 67 [2020-07-21 10:45:34,426 WARN L193 SmtUtils]: Spent 355.00 ms on a formula simplification that was a NOOP. DAG size: 67 [2020-07-21 10:45:34,768 WARN L193 SmtUtils]: Spent 339.00 ms on a formula simplification that was a NOOP. DAG size: 63 [2020-07-21 10:45:35,080 WARN L193 SmtUtils]: Spent 308.00 ms on a formula simplification that was a NOOP. DAG size: 60 [2020-07-21 10:45:35,360 WARN L193 SmtUtils]: Spent 276.00 ms on a formula simplification that was a NOOP. DAG size: 56 [2020-07-21 10:45:35,632 WARN L193 SmtUtils]: Spent 268.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2020-07-21 10:45:35,852 WARN L193 SmtUtils]: Spent 216.00 ms on a formula simplification that was a NOOP. DAG size: 51 [2020-07-21 10:45:36,049 WARN L193 SmtUtils]: Spent 194.00 ms on a formula simplification that was a NOOP. DAG size: 48 [2020-07-21 10:45:36,690 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [700096312] [2020-07-21 10:45:36,691 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-21 10:45:36,691 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18] total 18 [2020-07-21 10:45:36,691 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1357007898] [2020-07-21 10:45:36,692 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-07-21 10:45:36,692 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 10:45:36,692 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-07-21 10:45:36,693 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=300, Unknown=6, NotChecked=0, Total=342 [2020-07-21 10:45:36,693 INFO L87 Difference]: Start difference. First operand 50 states and 53 transitions. Second operand 18 states. [2020-07-21 10:45:55,698 WARN L193 SmtUtils]: Spent 504.00 ms on a formula simplification. DAG size of input: 61 DAG size of output: 28 [2020-07-21 10:46:01,132 WARN L193 SmtUtils]: Spent 532.00 ms on a formula simplification. DAG size of input: 55 DAG size of output: 26 [2020-07-21 10:46:02,298 WARN L193 SmtUtils]: Spent 403.00 ms on a formula simplification. DAG size of input: 51 DAG size of output: 27 [2020-07-21 10:46:05,410 WARN L193 SmtUtils]: Spent 480.00 ms on a formula simplification. DAG size of input: 46 DAG size of output: 28 [2020-07-21 10:46:13,661 WARN L193 SmtUtils]: Spent 4.38 s on a formula simplification. DAG size of input: 40 DAG size of output: 28 [2020-07-21 10:46:19,626 WARN L193 SmtUtils]: Spent 408.00 ms on a formula simplification. DAG size of input: 34 DAG size of output: 28 [2020-07-21 10:46:26,471 WARN L193 SmtUtils]: Spent 140.00 ms on a formula simplification that was a NOOP. DAG size: 28 [2020-07-21 10:46:38,616 WARN L193 SmtUtils]: Spent 219.00 ms on a formula simplification that was a NOOP. DAG size: 28 [2020-07-21 10:46:46,706 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 10:46:46,707 INFO L93 Difference]: Finished difference Result 71 states and 80 transitions. [2020-07-21 10:46:46,727 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-07-21 10:46:46,727 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 45 [2020-07-21 10:46:46,728 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 10:46:46,728 INFO L225 Difference]: With dead ends: 71 [2020-07-21 10:46:46,728 INFO L226 Difference]: Without dead ends: 52 [2020-07-21 10:46:46,730 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 33 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 55 ImplicationChecksByTransitivity, 42.7s TimeCoverageRelationStatistics Valid=128, Invalid=733, Unknown=9, NotChecked=0, Total=870 [2020-07-21 10:46:46,730 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2020-07-21 10:46:46,737 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 52. [2020-07-21 10:46:46,738 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 52 states. [2020-07-21 10:46:46,738 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 55 transitions. [2020-07-21 10:46:46,738 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 55 transitions. Word has length 45 [2020-07-21 10:46:46,742 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 10:46:46,742 INFO L479 AbstractCegarLoop]: Abstraction has 52 states and 55 transitions. [2020-07-21 10:46:46,742 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-07-21 10:46:46,742 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 55 transitions. [2020-07-21 10:46:46,743 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2020-07-21 10:46:46,743 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 10:46:46,743 INFO L422 BasicCegarLoop]: trace histogram [14, 11, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 10:46:46,944 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:46:46,944 INFO L427 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 10:46:46,945 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 10:46:46,945 INFO L82 PathProgramCache]: Analyzing trace with hash 539877124, now seen corresponding path program 14 times [2020-07-21 10:46:46,945 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 10:46:46,946 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [221090855] [2020-07-21 10:46:46,946 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 [2020-07-21 10:46:46,985 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 10:46:46,986 INFO L263 TraceCheckSpWp]: Trace formula consists of 103 conjuncts, 21 conjunts are in the unsatisfiable core [2020-07-21 10:46:46,987 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 10:46:47,974 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 15 [2020-07-21 10:47:01,236 INFO L134 CoverageAnalysis]: Checked inductivity of 196 backedges. 0 proven. 196 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 10:47:01,237 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 10:47:01,448 WARN L193 SmtUtils]: Spent 210.00 ms on a formula simplification that was a NOOP. DAG size: 51 [2020-07-21 10:47:01,655 WARN L193 SmtUtils]: Spent 202.00 ms on a formula simplification that was a NOOP. DAG size: 51 [2020-07-21 10:47:01,882 WARN L193 SmtUtils]: Spent 222.00 ms on a formula simplification that was a NOOP. DAG size: 55 [2020-07-21 10:47:02,107 WARN L193 SmtUtils]: Spent 221.00 ms on a formula simplification that was a NOOP. DAG size: 55 [2020-07-21 10:47:02,326 WARN L193 SmtUtils]: Spent 212.00 ms on a formula simplification that was a NOOP. DAG size: 71 [2020-07-21 10:47:02,673 WARN L193 SmtUtils]: Spent 342.00 ms on a formula simplification that was a NOOP. DAG size: 70 [2020-07-21 10:47:03,092 WARN L193 SmtUtils]: Spent 415.00 ms on a formula simplification that was a NOOP. DAG size: 72 [2020-07-21 10:47:03,493 WARN L193 SmtUtils]: Spent 395.00 ms on a formula simplification that was a NOOP. DAG size: 68 [2020-07-21 10:47:03,880 WARN L193 SmtUtils]: Spent 383.00 ms on a formula simplification that was a NOOP. DAG size: 66 [2020-07-21 10:47:04,227 WARN L193 SmtUtils]: Spent 343.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2020-07-21 10:47:04,563 WARN L193 SmtUtils]: Spent 332.00 ms on a formula simplification that was a NOOP. DAG size: 60 [2020-07-21 10:47:04,875 WARN L193 SmtUtils]: Spent 308.00 ms on a formula simplification that was a NOOP. DAG size: 59 [2020-07-21 10:47:05,149 WARN L193 SmtUtils]: Spent 270.00 ms on a formula simplification that was a NOOP. DAG size: 55 [2020-07-21 10:47:06,374 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [221090855] [2020-07-21 10:47:06,375 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-21 10:47:06,375 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19] total 19 [2020-07-21 10:47:06,375 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [309750422] [2020-07-21 10:47:06,375 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-07-21 10:47:06,375 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 10:47:06,376 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-07-21 10:47:06,376 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=340, Unknown=2, NotChecked=0, Total=380 [2020-07-21 10:47:06,376 INFO L87 Difference]: Start difference. First operand 52 states and 55 transitions. Second operand 19 states. [2020-07-21 10:47:15,679 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 17 DAG size of output: 11 [2020-07-21 10:47:41,194 WARN L193 SmtUtils]: Spent 419.00 ms on a formula simplification. DAG size of input: 67 DAG size of output: 28 [2020-07-21 10:47:46,928 WARN L193 SmtUtils]: Spent 754.00 ms on a formula simplification. DAG size of input: 61 DAG size of output: 26 [2020-07-21 10:47:50,396 WARN L193 SmtUtils]: Spent 554.00 ms on a formula simplification. DAG size of input: 57 DAG size of output: 27 [2020-07-21 10:47:55,737 WARN L193 SmtUtils]: Spent 2.49 s on a formula simplification. DAG size of input: 52 DAG size of output: 28 [2020-07-21 10:47:59,008 WARN L193 SmtUtils]: Spent 403.00 ms on a formula simplification. DAG size of input: 46 DAG size of output: 28 [2020-07-21 10:48:04,964 WARN L193 SmtUtils]: Spent 1.01 s on a formula simplification. DAG size of input: 40 DAG size of output: 28 [2020-07-21 10:48:11,121 WARN L193 SmtUtils]: Spent 394.00 ms on a formula simplification. DAG size of input: 34 DAG size of output: 28 [2020-07-21 10:48:16,635 WARN L193 SmtUtils]: Spent 247.00 ms on a formula simplification that was a NOOP. DAG size: 28 [2020-07-21 10:48:29,720 WARN L193 SmtUtils]: Spent 297.00 ms on a formula simplification that was a NOOP. DAG size: 28 [2020-07-21 10:48:33,558 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 10:48:33,559 INFO L93 Difference]: Finished difference Result 70 states and 77 transitions. [2020-07-21 10:48:33,579 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2020-07-21 10:48:33,579 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 47 [2020-07-21 10:48:33,579 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 10:48:33,580 INFO L225 Difference]: With dead ends: 70 [2020-07-21 10:48:33,580 INFO L226 Difference]: Without dead ends: 57 [2020-07-21 10:48:33,581 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 64 GetRequests, 34 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 66 ImplicationChecksByTransitivity, 36.4s TimeCoverageRelationStatistics Valid=148, Invalid=840, Unknown=4, NotChecked=0, Total=992 [2020-07-21 10:48:33,581 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2020-07-21 10:48:33,586 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 54. [2020-07-21 10:48:33,586 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 54 states. [2020-07-21 10:48:33,587 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 58 transitions. [2020-07-21 10:48:33,587 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 58 transitions. Word has length 47 [2020-07-21 10:48:33,587 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 10:48:33,587 INFO L479 AbstractCegarLoop]: Abstraction has 54 states and 58 transitions. [2020-07-21 10:48:33,587 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-07-21 10:48:33,588 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 58 transitions. [2020-07-21 10:48:33,588 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2020-07-21 10:48:33,588 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 10:48:33,588 INFO L422 BasicCegarLoop]: trace histogram [15, 12, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 10:48:33,789 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:48:33,789 INFO L427 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 10:48:33,790 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 10:48:33,790 INFO L82 PathProgramCache]: Analyzing trace with hash -1270926623, now seen corresponding path program 15 times [2020-07-21 10:48:33,790 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 10:48:33,791 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [413773234] [2020-07-21 10:48:33,791 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 [2020-07-21 10:48:33,833 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 10:48:33,834 INFO L263 TraceCheckSpWp]: Trace formula consists of 107 conjuncts, 22 conjunts are in the unsatisfiable core [2020-07-21 10:48:33,835 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 10:48:52,179 INFO L134 CoverageAnalysis]: Checked inductivity of 225 backedges. 0 proven. 225 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 10:48:52,179 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 10:48:52,420 WARN L193 SmtUtils]: Spent 239.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2020-07-21 10:48:52,660 WARN L193 SmtUtils]: Spent 235.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2020-07-21 10:48:52,970 WARN L193 SmtUtils]: Spent 304.00 ms on a formula simplification that was a NOOP. DAG size: 58 [2020-07-21 10:48:53,259 WARN L193 SmtUtils]: Spent 284.00 ms on a formula simplification that was a NOOP. DAG size: 58 [2020-07-21 10:48:53,518 WARN L193 SmtUtils]: Spent 252.00 ms on a formula simplification that was a NOOP. DAG size: 75 [2020-07-21 10:48:54,046 WARN L193 SmtUtils]: Spent 523.00 ms on a formula simplification that was a NOOP. DAG size: 74 [2020-07-21 10:48:54,545 WARN L193 SmtUtils]: Spent 495.00 ms on a formula simplification that was a NOOP. DAG size: 70 [2020-07-21 10:48:55,027 WARN L193 SmtUtils]: Spent 477.00 ms on a formula simplification that was a NOOP. DAG size: 66 [2020-07-21 10:48:55,501 WARN L193 SmtUtils]: Spent 469.00 ms on a formula simplification that was a NOOP. DAG size: 63 [2020-07-21 10:48:55,959 WARN L193 SmtUtils]: Spent 454.00 ms on a formula simplification that was a NOOP. DAG size: 67 [2020-07-21 10:48:56,405 WARN L193 SmtUtils]: Spent 442.00 ms on a formula simplification that was a NOOP. DAG size: 65 [2020-07-21 10:48:56,809 WARN L193 SmtUtils]: Spent 399.00 ms on a formula simplification that was a NOOP. DAG size: 63 [2020-07-21 10:48:57,192 WARN L193 SmtUtils]: Spent 379.00 ms on a formula simplification that was a NOOP. DAG size: 59 [2020-07-21 10:48:57,521 WARN L193 SmtUtils]: Spent 324.00 ms on a formula simplification that was a NOOP. DAG size: 55 [2020-07-21 10:49:01,092 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [413773234] [2020-07-21 10:49:01,092 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-21 10:49:01,092 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20] total 20 [2020-07-21 10:49:01,092 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1587015780] [2020-07-21 10:49:01,092 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-07-21 10:49:01,093 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 10:49:01,093 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-07-21 10:49:01,093 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=40, Invalid=377, Unknown=3, NotChecked=0, Total=420 [2020-07-21 10:49:01,093 INFO L87 Difference]: Start difference. First operand 54 states and 58 transitions. Second operand 20 states. [2020-07-21 10:49:08,610 WARN L193 SmtUtils]: Spent 135.00 ms on a formula simplification. DAG size of input: 17 DAG size of output: 11 [2020-07-21 10:49:16,203 WARN L193 SmtUtils]: Spent 111.00 ms on a formula simplification. DAG size of input: 16 DAG size of output: 12 [2020-07-21 10:49:44,867 WARN L193 SmtUtils]: Spent 502.00 ms on a formula simplification. DAG size of input: 73 DAG size of output: 28 [2020-07-21 10:49:46,861 WARN L193 SmtUtils]: Spent 684.00 ms on a formula simplification. DAG size of input: 67 DAG size of output: 26 [2020-07-21 10:49:48,629 WARN L193 SmtUtils]: Spent 596.00 ms on a formula simplification. DAG size of input: 63 DAG size of output: 27 [2020-07-21 10:49:52,468 WARN L193 SmtUtils]: Spent 678.00 ms on a formula simplification. DAG size of input: 58 DAG size of output: 28 [2020-07-21 10:49:58,344 WARN L193 SmtUtils]: Spent 636.00 ms on a formula simplification. DAG size of input: 52 DAG size of output: 28 [2020-07-21 10:50:04,277 WARN L193 SmtUtils]: Spent 502.00 ms on a formula simplification. DAG size of input: 46 DAG size of output: 28 [2020-07-21 10:50:10,403 WARN L193 SmtUtils]: Spent 537.00 ms on a formula simplification. DAG size of input: 40 DAG size of output: 28 [2020-07-21 10:50:18,101 WARN L193 SmtUtils]: Spent 482.00 ms on a formula simplification. DAG size of input: 34 DAG size of output: 28 [2020-07-21 10:50:27,637 WARN L193 SmtUtils]: Spent 299.00 ms on a formula simplification that was a NOOP. DAG size: 28 [2020-07-21 10:50:36,946 WARN L193 SmtUtils]: Spent 282.00 ms on a formula simplification that was a NOOP. DAG size: 28 [2020-07-21 10:50:44,726 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 10:50:44,727 INFO L93 Difference]: Finished difference Result 75 states and 85 transitions. [2020-07-21 10:50:44,749 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-07-21 10:50:44,749 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 49 [2020-07-21 10:50:44,749 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 10:50:44,750 INFO L225 Difference]: With dead ends: 75 [2020-07-21 10:50:44,750 INFO L226 Difference]: Without dead ends: 56 [2020-07-21 10:50:44,751 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 67 GetRequests, 35 SyntacticMatches, 0 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 78 ImplicationChecksByTransitivity, 47.7s TimeCoverageRelationStatistics Valid=170, Invalid=946, Unknown=6, NotChecked=0, Total=1122 [2020-07-21 10:50:44,751 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2020-07-21 10:50:44,759 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 56. [2020-07-21 10:50:44,759 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2020-07-21 10:50:44,759 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 59 transitions. [2020-07-21 10:50:44,760 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 59 transitions. Word has length 49 [2020-07-21 10:50:44,760 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 10:50:44,760 INFO L479 AbstractCegarLoop]: Abstraction has 56 states and 59 transitions. [2020-07-21 10:50:44,760 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-07-21 10:50:44,760 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 59 transitions. [2020-07-21 10:50:44,761 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2020-07-21 10:50:44,761 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 10:50:44,761 INFO L422 BasicCegarLoop]: trace histogram [16, 13, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 10:50:44,963 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:50:44,964 INFO L427 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 10:50:44,964 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 10:50:44,964 INFO L82 PathProgramCache]: Analyzing trace with hash -1991572610, now seen corresponding path program 16 times [2020-07-21 10:50:44,965 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 10:50:44,965 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1413244247] [2020-07-21 10:50:44,966 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 [2020-07-21 10:50:45,010 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 10:50:45,011 INFO L263 TraceCheckSpWp]: Trace formula consists of 111 conjuncts, 23 conjunts are in the unsatisfiable core [2020-07-21 10:50:45,012 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 10:50:45,853 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 13 [2020-07-21 10:50:46,249 WARN L193 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 15 [2020-07-21 10:51:14,351 INFO L134 CoverageAnalysis]: Checked inductivity of 256 backedges. 0 proven. 256 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 10:51:14,352 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 10:51:14,666 WARN L193 SmtUtils]: Spent 312.00 ms on a formula simplification that was a NOOP. DAG size: 57 [2020-07-21 10:51:14,977 WARN L193 SmtUtils]: Spent 304.00 ms on a formula simplification that was a NOOP. DAG size: 57 [2020-07-21 10:51:15,337 WARN L193 SmtUtils]: Spent 354.00 ms on a formula simplification that was a NOOP. DAG size: 61 [2020-07-21 10:51:15,721 WARN L193 SmtUtils]: Spent 379.00 ms on a formula simplification that was a NOOP. DAG size: 61 [2020-07-21 10:51:16,045 WARN L193 SmtUtils]: Spent 317.00 ms on a formula simplification that was a NOOP. DAG size: 79 [2020-07-21 10:51:16,542 WARN L193 SmtUtils]: Spent 491.00 ms on a formula simplification that was a NOOP. DAG size: 78 [2020-07-21 10:51:17,019 WARN L193 SmtUtils]: Spent 472.00 ms on a formula simplification that was a NOOP. DAG size: 75 [2020-07-21 10:51:17,485 WARN L193 SmtUtils]: Spent 461.00 ms on a formula simplification that was a NOOP. DAG size: 73 [2020-07-21 10:51:17,937 WARN L193 SmtUtils]: Spent 447.00 ms on a formula simplification that was a NOOP. DAG size: 69 [2020-07-21 10:51:18,338 WARN L193 SmtUtils]: Spent 396.00 ms on a formula simplification that was a NOOP. DAG size: 65 [2020-07-21 10:51:18,733 WARN L193 SmtUtils]: Spent 389.00 ms on a formula simplification that was a NOOP. DAG size: 61 [2020-07-21 10:51:19,110 WARN L193 SmtUtils]: Spent 372.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2020-07-21 10:51:19,463 WARN L193 SmtUtils]: Spent 348.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2020-07-21 10:51:19,802 WARN L193 SmtUtils]: Spent 333.00 ms on a formula simplification that was a NOOP. DAG size: 50 [2020-07-21 10:51:20,101 WARN L193 SmtUtils]: Spent 294.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2020-07-21 10:51:22,793 WARN L193 SmtUtils]: Spent 126.00 ms on a formula simplification that was a NOOP. DAG size: 57 [2020-07-21 10:51:22,798 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1413244247] [2020-07-21 10:51:22,798 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-21 10:51:22,798 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21] total 21 [2020-07-21 10:51:22,798 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [745807549] [2020-07-21 10:51:22,799 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-21 10:51:22,799 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 10:51:22,799 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-21 10:51:22,799 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=415, Unknown=5, NotChecked=0, Total=462 [2020-07-21 10:51:22,800 INFO L87 Difference]: Start difference. First operand 56 states and 59 transitions. Second operand 21 states. [2020-07-21 10:51:29,938 WARN L193 SmtUtils]: Spent 139.00 ms on a formula simplification. DAG size of input: 17 DAG size of output: 11 [2020-07-21 10:51:36,787 WARN L193 SmtUtils]: Spent 158.00 ms on a formula simplification. DAG size of input: 16 DAG size of output: 12 [2020-07-21 10:52:00,712 WARN L193 SmtUtils]: Spent 739.00 ms on a formula simplification. DAG size of input: 79 DAG size of output: 28 [2020-07-21 10:52:05,284 WARN L193 SmtUtils]: Spent 944.00 ms on a formula simplification. DAG size of input: 73 DAG size of output: 26 [2020-07-21 10:52:09,691 WARN L193 SmtUtils]: Spent 1.10 s on a formula simplification. DAG size of input: 69 DAG size of output: 27 [2020-07-21 10:52:16,572 WARN L193 SmtUtils]: Spent 761.00 ms on a formula simplification. DAG size of input: 64 DAG size of output: 28 [2020-07-21 10:52:21,533 WARN L193 SmtUtils]: Spent 711.00 ms on a formula simplification. DAG size of input: 58 DAG size of output: 28 [2020-07-21 10:52:24,482 WARN L193 SmtUtils]: Spent 792.00 ms on a formula simplification. DAG size of input: 52 DAG size of output: 28 [2020-07-21 10:52:29,247 WARN L193 SmtUtils]: Spent 942.00 ms on a formula simplification. DAG size of input: 46 DAG size of output: 28 [2020-07-21 10:52:34,876 WARN L193 SmtUtils]: Spent 691.00 ms on a formula simplification. DAG size of input: 40 DAG size of output: 28 [2020-07-21 10:52:39,951 WARN L193 SmtUtils]: Spent 635.00 ms on a formula simplification. DAG size of input: 34 DAG size of output: 28 [2020-07-21 10:52:43,994 WARN L193 SmtUtils]: Spent 286.00 ms on a formula simplification that was a NOOP. DAG size: 28 [2020-07-21 10:52:56,142 WARN L193 SmtUtils]: Spent 410.00 ms on a formula simplification that was a NOOP. DAG size: 28 [2020-07-21 10:53:04,357 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 10:53:04,357 INFO L93 Difference]: Finished difference Result 77 states and 86 transitions. [2020-07-21 10:53:04,415 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-07-21 10:53:04,415 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 51 [2020-07-21 10:53:04,415 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 10:53:04,416 INFO L225 Difference]: With dead ends: 77 [2020-07-21 10:53:04,416 INFO L226 Difference]: Without dead ends: 58 [2020-07-21 10:53:04,417 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 70 GetRequests, 36 SyntacticMatches, 0 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 91 ImplicationChecksByTransitivity, 74.6s TimeCoverageRelationStatistics Valid=194, Invalid=1054, Unknown=12, NotChecked=0, Total=1260 [2020-07-21 10:53:04,417 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2020-07-21 10:53:04,428 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 58. [2020-07-21 10:53:04,428 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 58 states. [2020-07-21 10:53:04,429 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 61 transitions. [2020-07-21 10:53:04,429 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 61 transitions. Word has length 51 [2020-07-21 10:53:04,429 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 10:53:04,429 INFO L479 AbstractCegarLoop]: Abstraction has 58 states and 61 transitions. [2020-07-21 10:53:04,429 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-21 10:53:04,429 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 61 transitions. [2020-07-21 10:53:04,430 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2020-07-21 10:53:04,430 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 10:53:04,430 INFO L422 BasicCegarLoop]: trace histogram [17, 14, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 10:53:04,639 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:53:04,640 INFO L427 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 10:53:04,641 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 10:53:04,641 INFO L82 PathProgramCache]: Analyzing trace with hash 1252335835, now seen corresponding path program 17 times [2020-07-21 10:53:04,641 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 10:53:04,642 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1116005372] [2020-07-21 10:53:04,642 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 [2020-07-21 10:53:04,687 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 10:53:04,688 INFO L263 TraceCheckSpWp]: Trace formula consists of 115 conjuncts, 24 conjunts are in the unsatisfiable core [2020-07-21 10:53:04,690 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 10:53:05,622 WARN L193 SmtUtils]: Spent 147.00 ms on a formula simplification that was a NOOP. DAG size: 13 [2020-07-21 10:53:06,088 WARN L193 SmtUtils]: Spent 129.00 ms on a formula simplification that was a NOOP. DAG size: 15 [2020-07-21 10:53:25,247 WARN L193 SmtUtils]: Spent 113.00 ms on a formula simplification that was a NOOP. DAG size: 21 [2020-07-21 10:53:32,208 INFO L134 CoverageAnalysis]: Checked inductivity of 289 backedges. 0 proven. 289 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 10:53:32,208 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 10:53:32,544 WARN L193 SmtUtils]: Spent 333.00 ms on a formula simplification that was a NOOP. DAG size: 60 [2020-07-21 10:53:32,883 WARN L193 SmtUtils]: Spent 333.00 ms on a formula simplification that was a NOOP. DAG size: 60 [2020-07-21 10:53:33,257 WARN L193 SmtUtils]: Spent 367.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2020-07-21 10:53:33,628 WARN L193 SmtUtils]: Spent 365.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2020-07-21 10:53:34,023 WARN L193 SmtUtils]: Spent 388.00 ms on a formula simplification that was a NOOP. DAG size: 83 [2020-07-21 10:53:34,888 WARN L193 SmtUtils]: Spent 859.00 ms on a formula simplification that was a NOOP. DAG size: 82 [2020-07-21 10:53:35,716 WARN L193 SmtUtils]: Spent 822.00 ms on a formula simplification that was a NOOP. DAG size: 80 [2020-07-21 10:53:36,451 WARN L193 SmtUtils]: Spent 730.00 ms on a formula simplification that was a NOOP. DAG size: 77 [2020-07-21 10:53:37,126 WARN L193 SmtUtils]: Spent 670.00 ms on a formula simplification that was a NOOP. DAG size: 75 [2020-07-21 10:53:37,765 WARN L193 SmtUtils]: Spent 634.00 ms on a formula simplification that was a NOOP. DAG size: 69 [2020-07-21 10:53:38,391 WARN L193 SmtUtils]: Spent 620.00 ms on a formula simplification that was a NOOP. DAG size: 67 [2020-07-21 10:53:38,953 WARN L193 SmtUtils]: Spent 557.00 ms on a formula simplification that was a NOOP. DAG size: 61 [2020-07-21 10:53:39,476 WARN L193 SmtUtils]: Spent 518.00 ms on a formula simplification that was a NOOP. DAG size: 57 [2020-07-21 10:53:39,967 WARN L193 SmtUtils]: Spent 485.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2020-07-21 10:53:40,489 WARN L193 SmtUtils]: Spent 516.00 ms on a formula simplification that was a NOOP. DAG size: 50 [2020-07-21 10:53:40,911 WARN L193 SmtUtils]: Spent 417.00 ms on a formula simplification that was a NOOP. DAG size: 48 [2020-07-21 10:53:43,519 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1116005372] [2020-07-21 10:53:43,519 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-21 10:53:43,519 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22] total 22 [2020-07-21 10:53:43,519 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1026461152] [2020-07-21 10:53:43,520 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-07-21 10:53:43,520 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 10:53:43,520 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-07-21 10:53:43,520 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=459, Unknown=3, NotChecked=0, Total=506 [2020-07-21 10:53:43,521 INFO L87 Difference]: Start difference. First operand 58 states and 61 transitions. Second operand 22 states. [2020-07-21 10:53:53,824 WARN L193 SmtUtils]: Spent 158.00 ms on a formula simplification. DAG size of input: 17 DAG size of output: 11 [2020-07-21 10:54:03,363 WARN L193 SmtUtils]: Spent 141.00 ms on a formula simplification. DAG size of input: 16 DAG size of output: 12 [2020-07-21 10:54:26,407 WARN L193 SmtUtils]: Spent 825.00 ms on a formula simplification. DAG size of input: 85 DAG size of output: 28 [2020-07-21 10:54:34,898 WARN L193 SmtUtils]: Spent 1.16 s on a formula simplification. DAG size of input: 79 DAG size of output: 26 [2020-07-21 10:54:39,726 WARN L193 SmtUtils]: Spent 994.00 ms on a formula simplification. DAG size of input: 75 DAG size of output: 27 [2020-07-21 10:54:45,491 WARN L193 SmtUtils]: Spent 1.36 s on a formula simplification. DAG size of input: 70 DAG size of output: 28 [2020-07-21 10:54:50,592 WARN L193 SmtUtils]: Spent 862.00 ms on a formula simplification. DAG size of input: 64 DAG size of output: 28 [2020-07-21 10:54:57,897 WARN L193 SmtUtils]: Spent 838.00 ms on a formula simplification. DAG size of input: 58 DAG size of output: 28