/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/loop-invgen/fragtest_simple.i -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-20 11:53:10,036 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-20 11:53:10,038 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-20 11:53:10,057 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-20 11:53:10,057 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-20 11:53:10,060 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-20 11:53:10,061 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-20 11:53:10,075 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-20 11:53:10,077 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-20 11:53:10,078 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-20 11:53:10,079 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-20 11:53:10,080 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-20 11:53:10,081 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-20 11:53:10,085 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-20 11:53:10,087 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-20 11:53:10,089 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-20 11:53:10,091 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-20 11:53:10,092 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-20 11:53:10,094 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-20 11:53:10,098 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-20 11:53:10,099 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-20 11:53:10,100 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-20 11:53:10,103 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-20 11:53:10,103 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-20 11:53:10,106 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-20 11:53:10,113 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-20 11:53:10,114 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-20 11:53:10,115 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-20 11:53:10,116 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-07-20 11:53:10,129 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-20 11:53:10,130 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-20 11:53:10,131 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-20 11:53:10,131 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-20 11:53:10,131 INFO L138 SettingsManager]: * Use SBE=true [2020-07-20 11:53:10,131 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-20 11:53:10,132 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-20 11:53:10,132 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-20 11:53:10,132 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-20 11:53:10,132 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-20 11:53:10,132 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-20 11:53:10,133 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-20 11:53:10,133 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-20 11:53:10,133 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-20 11:53:10,133 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-20 11:53:10,133 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-20 11:53:10,134 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-20 11:53:10,134 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-20 11:53:10,134 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-20 11:53:10,134 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-20 11:53:10,134 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-20 11:53:10,135 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 11:53:10,135 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-20 11:53:10,135 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-20 11:53:10,135 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-20 11:53:10,135 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-20 11:53:10,136 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:53:10,136 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-20 11:53:10,136 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-20 11:53:10,136 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 [2020-07-20 11:53:10,430 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-20 11:53:10,442 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-20 11:53:10,446 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-20 11:53:10,447 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-20 11:53:10,447 INFO L275 PluginConnector]: CDTParser initialized [2020-07-20 11:53:10,448 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-invgen/fragtest_simple.i [2020-07-20 11:53:10,517 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/c9dbef731/d7662c6e1da74f5198e3468be00f6729/FLAGe1c41fbab [2020-07-20 11:53:10,919 INFO L306 CDTParser]: Found 1 translation units. [2020-07-20 11:53:10,920 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-invgen/fragtest_simple.i [2020-07-20 11:53:10,927 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/c9dbef731/d7662c6e1da74f5198e3468be00f6729/FLAGe1c41fbab [2020-07-20 11:53:11,337 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/c9dbef731/d7662c6e1da74f5198e3468be00f6729 [2020-07-20 11:53:11,345 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-20 11:53:11,348 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-20 11:53:11,349 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-20 11:53:11,349 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-20 11:53:11,352 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-20 11:53:11,353 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 11:53:11" (1/1) ... [2020-07-20 11:53:11,356 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@208b9fa8 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:53:11, skipping insertion in model container [2020-07-20 11:53:11,356 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 11:53:11" (1/1) ... [2020-07-20 11:53:11,364 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-20 11:53:11,383 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-20 11:53:11,549 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 11:53:11,553 INFO L203 MainTranslator]: Completed pre-run [2020-07-20 11:53:11,572 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 11:53:11,587 INFO L208 MainTranslator]: Completed translation [2020-07-20 11:53:11,587 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:53:11 WrapperNode [2020-07-20 11:53:11,587 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-20 11:53:11,588 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-20 11:53:11,588 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-20 11:53:11,589 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-20 11:53:11,602 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:53:11" (1/1) ... [2020-07-20 11:53:11,603 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:53:11" (1/1) ... [2020-07-20 11:53:11,608 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:53:11" (1/1) ... [2020-07-20 11:53:11,609 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:53:11" (1/1) ... [2020-07-20 11:53:11,613 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:53:11" (1/1) ... [2020-07-20 11:53:11,737 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:53:11" (1/1) ... [2020-07-20 11:53:11,739 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:53:11" (1/1) ... [2020-07-20 11:53:11,744 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-20 11:53:11,744 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-20 11:53:11,745 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-20 11:53:11,745 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-20 11:53:11,746 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:53:11" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 11:53:11,824 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-20 11:53:11,824 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-20 11:53:11,825 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2020-07-20 11:53:11,825 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-07-20 11:53:11,825 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-20 11:53:11,825 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-20 11:53:11,825 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-07-20 11:53:11,825 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2020-07-20 11:53:11,825 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-07-20 11:53:11,825 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-20 11:53:11,826 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-20 11:53:11,826 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-20 11:53:11,826 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-20 11:53:12,021 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-20 11:53:12,022 INFO L295 CfgBuilder]: Removed 3 assume(true) statements. [2020-07-20 11:53:12,026 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 11:53:12 BoogieIcfgContainer [2020-07-20 11:53:12,026 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-20 11:53:12,030 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-20 11:53:12,030 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-20 11:53:12,033 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-20 11:53:12,034 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.07 11:53:11" (1/3) ... [2020-07-20 11:53:12,035 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2d799cd1 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 11:53:12, skipping insertion in model container [2020-07-20 11:53:12,035 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:53:11" (2/3) ... [2020-07-20 11:53:12,036 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2d799cd1 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 11:53:12, skipping insertion in model container [2020-07-20 11:53:12,036 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 11:53:12" (3/3) ... [2020-07-20 11:53:12,045 INFO L109 eAbstractionObserver]: Analyzing ICFG fragtest_simple.i [2020-07-20 11:53:12,054 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-20 11:53:12,061 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-20 11:53:12,075 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-20 11:53:12,099 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-20 11:53:12,099 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-20 11:53:12,099 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-20 11:53:12,099 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-20 11:53:12,100 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-20 11:53:12,100 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-20 11:53:12,100 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-20 11:53:12,100 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-20 11:53:12,119 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states. [2020-07-20 11:53:12,125 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2020-07-20 11:53:12,125 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:53:12,126 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:53:12,127 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:53:12,133 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:53:12,133 INFO L82 PathProgramCache]: Analyzing trace with hash 317368997, now seen corresponding path program 1 times [2020-07-20 11:53:12,142 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:53:12,142 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [666736863] [2020-07-20 11:53:12,143 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 [2020-07-20 11:53:12,203 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:53:12,205 INFO L263 TraceCheckSpWp]: Trace formula consists of 39 conjuncts, 1 conjunts are in the unsatisfiable core [2020-07-20 11:53:12,212 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:53:12,258 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 11:53:12,258 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 11:53:12,259 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [666736863] [2020-07-20 11:53:12,260 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 11:53:12,263 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2020-07-20 11:53:12,264 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [823654847] [2020-07-20 11:53:12,276 INFO L459 AbstractCegarLoop]: Interpolant automaton has 2 states [2020-07-20 11:53:12,276 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:53:12,299 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2020-07-20 11:53:12,300 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-07-20 11:53:12,303 INFO L87 Difference]: Start difference. First operand 27 states. Second operand 2 states. [2020-07-20 11:53:12,331 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:53:12,331 INFO L93 Difference]: Finished difference Result 47 states and 62 transitions. [2020-07-20 11:53:12,331 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2020-07-20 11:53:12,333 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 15 [2020-07-20 11:53:12,333 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:53:12,341 INFO L225 Difference]: With dead ends: 47 [2020-07-20 11:53:12,341 INFO L226 Difference]: Without dead ends: 22 [2020-07-20 11:53:12,344 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-07-20 11:53:12,363 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2020-07-20 11:53:12,380 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2020-07-20 11:53:12,382 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2020-07-20 11:53:12,383 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 25 transitions. [2020-07-20 11:53:12,385 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 25 transitions. Word has length 15 [2020-07-20 11:53:12,385 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:53:12,385 INFO L479 AbstractCegarLoop]: Abstraction has 22 states and 25 transitions. [2020-07-20 11:53:12,385 INFO L480 AbstractCegarLoop]: Interpolant automaton has 2 states. [2020-07-20 11:53:12,385 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 25 transitions. [2020-07-20 11:53:12,386 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2020-07-20 11:53:12,386 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:53:12,386 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:53:12,601 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:53:12,601 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:53:12,602 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:53:12,602 INFO L82 PathProgramCache]: Analyzing trace with hash 1632722591, now seen corresponding path program 1 times [2020-07-20 11:53:12,603 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:53:12,604 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [351765418] [2020-07-20 11:53:12,604 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 [2020-07-20 11:53:12,646 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:53:12,648 INFO L263 TraceCheckSpWp]: Trace formula consists of 43 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-20 11:53:12,650 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:53:12,692 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 11:53:12,729 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 11:53:12,729 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 11:53:12,730 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [351765418] [2020-07-20 11:53:12,730 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 11:53:12,731 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-20 11:53:12,731 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [759040330] [2020-07-20 11:53:12,733 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-20 11:53:12,733 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:53:12,733 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-20 11:53:12,734 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-20 11:53:12,734 INFO L87 Difference]: Start difference. First operand 22 states and 25 transitions. Second operand 5 states. [2020-07-20 11:53:12,791 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:53:12,791 INFO L93 Difference]: Finished difference Result 31 states and 34 transitions. [2020-07-20 11:53:12,792 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-20 11:53:12,792 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 17 [2020-07-20 11:53:12,792 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:53:12,793 INFO L225 Difference]: With dead ends: 31 [2020-07-20 11:53:12,794 INFO L226 Difference]: Without dead ends: 29 [2020-07-20 11:53:12,795 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 [2020-07-20 11:53:12,795 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2020-07-20 11:53:12,804 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 28. [2020-07-20 11:53:12,804 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2020-07-20 11:53:12,805 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 31 transitions. [2020-07-20 11:53:12,806 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 31 transitions. Word has length 17 [2020-07-20 11:53:12,806 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:53:12,806 INFO L479 AbstractCegarLoop]: Abstraction has 28 states and 31 transitions. [2020-07-20 11:53:12,806 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-20 11:53:12,807 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 31 transitions. [2020-07-20 11:53:12,807 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-07-20 11:53:12,808 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:53:12,808 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:53:13,022 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:53:13,023 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:53:13,023 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:53:13,024 INFO L82 PathProgramCache]: Analyzing trace with hash -1401298672, now seen corresponding path program 1 times [2020-07-20 11:53:13,025 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:53:13,025 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1901346295] [2020-07-20 11:53:13,025 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 [2020-07-20 11:53:13,062 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:53:13,063 INFO L263 TraceCheckSpWp]: Trace formula consists of 60 conjuncts, 5 conjunts are in the unsatisfiable core [2020-07-20 11:53:13,065 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:53:13,111 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 11:53:13,112 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 11:53:13,112 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1901346295] [2020-07-20 11:53:13,113 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 11:53:13,113 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-20 11:53:13,113 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [223413392] [2020-07-20 11:53:13,114 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-20 11:53:13,114 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:53:13,114 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-20 11:53:13,115 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2020-07-20 11:53:13,115 INFO L87 Difference]: Start difference. First operand 28 states and 31 transitions. Second operand 5 states. [2020-07-20 11:53:13,186 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:53:13,186 INFO L93 Difference]: Finished difference Result 49 states and 56 transitions. [2020-07-20 11:53:13,187 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-20 11:53:13,187 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 25 [2020-07-20 11:53:13,187 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:53:13,191 INFO L225 Difference]: With dead ends: 49 [2020-07-20 11:53:13,191 INFO L226 Difference]: Without dead ends: 34 [2020-07-20 11:53:13,192 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=18, Invalid=24, Unknown=0, NotChecked=0, Total=42 [2020-07-20 11:53:13,192 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2020-07-20 11:53:13,206 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 30. [2020-07-20 11:53:13,206 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-07-20 11:53:13,207 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 33 transitions. [2020-07-20 11:53:13,207 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 33 transitions. Word has length 25 [2020-07-20 11:53:13,208 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:53:13,208 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 33 transitions. [2020-07-20 11:53:13,208 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-20 11:53:13,208 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 33 transitions. [2020-07-20 11:53:13,209 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-07-20 11:53:13,209 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:53:13,209 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:53:13,410 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:53:13,410 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:53:13,411 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:53:13,411 INFO L82 PathProgramCache]: Analyzing trace with hash 1107622837, now seen corresponding path program 1 times [2020-07-20 11:53:13,412 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:53:13,412 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1528159708] [2020-07-20 11:53:13,413 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 [2020-07-20 11:53:13,443 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:53:13,444 INFO L263 TraceCheckSpWp]: Trace formula consists of 70 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-20 11:53:13,447 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:53:13,499 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 4 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 11:53:13,500 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:53:13,551 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 4 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 11:53:13,552 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1528159708] [2020-07-20 11:53:13,552 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:53:13,553 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 8 [2020-07-20 11:53:13,553 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1770257488] [2020-07-20 11:53:13,553 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-07-20 11:53:13,554 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:53:13,554 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-07-20 11:53:13,554 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=37, Unknown=0, NotChecked=0, Total=56 [2020-07-20 11:53:13,555 INFO L87 Difference]: Start difference. First operand 30 states and 33 transitions. Second operand 8 states. [2020-07-20 11:53:13,679 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:53:13,679 INFO L93 Difference]: Finished difference Result 55 states and 64 transitions. [2020-07-20 11:53:13,680 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-20 11:53:13,680 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 27 [2020-07-20 11:53:13,681 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:53:13,681 INFO L225 Difference]: With dead ends: 55 [2020-07-20 11:53:13,682 INFO L226 Difference]: Without dead ends: 40 [2020-07-20 11:53:13,682 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 45 SyntacticMatches, 2 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=33, Invalid=57, Unknown=0, NotChecked=0, Total=90 [2020-07-20 11:53:13,683 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2020-07-20 11:53:13,688 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 32. [2020-07-20 11:53:13,688 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2020-07-20 11:53:13,689 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 35 transitions. [2020-07-20 11:53:13,690 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 35 transitions. Word has length 27 [2020-07-20 11:53:13,690 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:53:13,690 INFO L479 AbstractCegarLoop]: Abstraction has 32 states and 35 transitions. [2020-07-20 11:53:13,690 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-07-20 11:53:13,690 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 35 transitions. [2020-07-20 11:53:13,691 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2020-07-20 11:53:13,691 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:53:13,691 INFO L422 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:53:13,906 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:53:13,907 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:53:13,908 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:53:13,908 INFO L82 PathProgramCache]: Analyzing trace with hash -1590427366, now seen corresponding path program 2 times [2020-07-20 11:53:13,908 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:53:13,909 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [427493786] [2020-07-20 11:53:13,909 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 [2020-07-20 11:53:13,941 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:53:13,942 INFO L263 TraceCheckSpWp]: Trace formula consists of 80 conjuncts, 7 conjunts are in the unsatisfiable core [2020-07-20 11:53:13,944 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:53:13,970 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 11:53:13,996 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 8 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 11:53:13,997 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:53:14,014 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:53:14,046 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 8 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 11:53:14,046 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [427493786] [2020-07-20 11:53:14,046 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:53:14,047 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 8 [2020-07-20 11:53:14,047 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1935902336] [2020-07-20 11:53:14,047 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-07-20 11:53:14,048 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:53:14,048 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-07-20 11:53:14,048 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=37, Unknown=0, NotChecked=0, Total=56 [2020-07-20 11:53:14,048 INFO L87 Difference]: Start difference. First operand 32 states and 35 transitions. Second operand 8 states. [2020-07-20 11:53:14,110 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:53:14,110 INFO L93 Difference]: Finished difference Result 51 states and 56 transitions. [2020-07-20 11:53:14,111 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-20 11:53:14,111 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 29 [2020-07-20 11:53:14,111 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:53:14,112 INFO L225 Difference]: With dead ends: 51 [2020-07-20 11:53:14,112 INFO L226 Difference]: Without dead ends: 49 [2020-07-20 11:53:14,113 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 47 SyntacticMatches, 4 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=23, Invalid=49, Unknown=0, NotChecked=0, Total=72 [2020-07-20 11:53:14,114 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2020-07-20 11:53:14,120 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 44. [2020-07-20 11:53:14,121 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2020-07-20 11:53:14,122 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 48 transitions. [2020-07-20 11:53:14,122 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 48 transitions. Word has length 29 [2020-07-20 11:53:14,123 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:53:14,123 INFO L479 AbstractCegarLoop]: Abstraction has 44 states and 48 transitions. [2020-07-20 11:53:14,123 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-07-20 11:53:14,123 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 48 transitions. [2020-07-20 11:53:14,125 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2020-07-20 11:53:14,125 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:53:14,125 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 4, 3, 3, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:53:14,338 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:53:14,339 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:53:14,339 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:53:14,340 INFO L82 PathProgramCache]: Analyzing trace with hash -30298372, now seen corresponding path program 3 times [2020-07-20 11:53:14,340 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:53:14,340 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [697192580] [2020-07-20 11:53:14,340 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:53:14,373 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:53:14,374 INFO L263 TraceCheckSpWp]: Trace formula consists of 114 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-20 11:53:14,376 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:53:14,466 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 28 proven. 6 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2020-07-20 11:53:14,467 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:53:14,550 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 22 proven. 6 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2020-07-20 11:53:14,551 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [697192580] [2020-07-20 11:53:14,551 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:53:14,551 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 11 [2020-07-20 11:53:14,551 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [194595331] [2020-07-20 11:53:14,552 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-07-20 11:53:14,552 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:53:14,552 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-07-20 11:53:14,553 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=76, Unknown=0, NotChecked=0, Total=110 [2020-07-20 11:53:14,553 INFO L87 Difference]: Start difference. First operand 44 states and 48 transitions. Second operand 11 states. [2020-07-20 11:53:14,685 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:53:14,685 INFO L93 Difference]: Finished difference Result 83 states and 96 transitions. [2020-07-20 11:53:14,686 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-20 11:53:14,687 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 45 [2020-07-20 11:53:14,687 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:53:14,689 INFO L225 Difference]: With dead ends: 83 [2020-07-20 11:53:14,689 INFO L226 Difference]: Without dead ends: 58 [2020-07-20 11:53:14,690 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 92 GetRequests, 77 SyntacticMatches, 3 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=61, Invalid=121, Unknown=0, NotChecked=0, Total=182 [2020-07-20 11:53:14,691 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2020-07-20 11:53:14,704 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 46. [2020-07-20 11:53:14,704 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-07-20 11:53:14,708 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 50 transitions. [2020-07-20 11:53:14,708 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 50 transitions. Word has length 45 [2020-07-20 11:53:14,709 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:53:14,709 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 50 transitions. [2020-07-20 11:53:14,709 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-07-20 11:53:14,709 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 50 transitions. [2020-07-20 11:53:14,713 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2020-07-20 11:53:14,713 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:53:14,714 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:53:14,914 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:53:14,915 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:53:14,915 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:53:14,916 INFO L82 PathProgramCache]: Analyzing trace with hash 130155809, now seen corresponding path program 4 times [2020-07-20 11:53:14,916 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:53:14,917 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1872793174] [2020-07-20 11:53:14,917 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 [2020-07-20 11:53:14,954 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:53:14,955 INFO L263 TraceCheckSpWp]: Trace formula consists of 124 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-20 11:53:14,958 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:53:15,049 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 24 proven. 12 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2020-07-20 11:53:15,049 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:53:15,133 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 24 proven. 12 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2020-07-20 11:53:15,134 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1872793174] [2020-07-20 11:53:15,134 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:53:15,134 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10] total 14 [2020-07-20 11:53:15,134 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2048550286] [2020-07-20 11:53:15,135 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-07-20 11:53:15,135 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:53:15,135 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-07-20 11:53:15,136 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=129, Unknown=0, NotChecked=0, Total=182 [2020-07-20 11:53:15,136 INFO L87 Difference]: Start difference. First operand 46 states and 50 transitions. Second operand 14 states. [2020-07-20 11:53:15,311 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:53:15,312 INFO L93 Difference]: Finished difference Result 87 states and 103 transitions. [2020-07-20 11:53:15,312 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-20 11:53:15,312 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 47 [2020-07-20 11:53:15,313 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:53:15,313 INFO L225 Difference]: With dead ends: 87 [2020-07-20 11:53:15,314 INFO L226 Difference]: Without dead ends: 64 [2020-07-20 11:53:15,314 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 97 GetRequests, 77 SyntacticMatches, 4 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 51 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=97, Invalid=209, Unknown=0, NotChecked=0, Total=306 [2020-07-20 11:53:15,315 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2020-07-20 11:53:15,320 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 48. [2020-07-20 11:53:15,320 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2020-07-20 11:53:15,321 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 52 transitions. [2020-07-20 11:53:15,321 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 52 transitions. Word has length 47 [2020-07-20 11:53:15,322 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:53:15,322 INFO L479 AbstractCegarLoop]: Abstraction has 48 states and 52 transitions. [2020-07-20 11:53:15,322 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-07-20 11:53:15,322 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 52 transitions. [2020-07-20 11:53:15,323 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2020-07-20 11:53:15,323 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:53:15,323 INFO L422 BasicCegarLoop]: trace histogram [5, 4, 4, 4, 4, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:53:15,524 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:53:15,525 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:53:15,525 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:53:15,525 INFO L82 PathProgramCache]: Analyzing trace with hash -292198906, now seen corresponding path program 5 times [2020-07-20 11:53:15,526 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:53:15,526 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [998571779] [2020-07-20 11:53:15,527 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 [2020-07-20 11:53:15,561 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:53:15,562 INFO L263 TraceCheckSpWp]: Trace formula consists of 134 conjuncts, 11 conjunts are in the unsatisfiable core [2020-07-20 11:53:15,565 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:53:15,611 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 11:53:15,626 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 26 proven. 18 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2020-07-20 11:53:15,626 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:53:15,646 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:53:15,700 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 26 proven. 18 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2020-07-20 11:53:15,701 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [998571779] [2020-07-20 11:53:15,701 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:53:15,701 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 10 [2020-07-20 11:53:15,702 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [20582121] [2020-07-20 11:53:15,702 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-07-20 11:53:15,702 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:53:15,702 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-07-20 11:53:15,703 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=58, Unknown=0, NotChecked=0, Total=90 [2020-07-20 11:53:15,703 INFO L87 Difference]: Start difference. First operand 48 states and 52 transitions. Second operand 10 states. [2020-07-20 11:53:15,788 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:53:15,788 INFO L93 Difference]: Finished difference Result 67 states and 73 transitions. [2020-07-20 11:53:15,788 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-20 11:53:15,789 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 49 [2020-07-20 11:53:15,789 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:53:15,790 INFO L225 Difference]: With dead ends: 67 [2020-07-20 11:53:15,790 INFO L226 Difference]: Without dead ends: 65 [2020-07-20 11:53:15,791 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 98 GetRequests, 81 SyntacticMatches, 8 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 43 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=36, Invalid=74, Unknown=0, NotChecked=0, Total=110 [2020-07-20 11:53:15,791 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2020-07-20 11:53:15,797 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 60. [2020-07-20 11:53:15,798 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 60 states. [2020-07-20 11:53:15,798 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 65 transitions. [2020-07-20 11:53:15,799 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 65 transitions. Word has length 49 [2020-07-20 11:53:15,799 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:53:15,799 INFO L479 AbstractCegarLoop]: Abstraction has 60 states and 65 transitions. [2020-07-20 11:53:15,799 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-07-20 11:53:15,799 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 65 transitions. [2020-07-20 11:53:15,800 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2020-07-20 11:53:15,801 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:53:15,801 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 6, 5, 5, 5, 5, 5, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:53:16,015 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:53:16,016 INFO L427 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:53:16,017 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:53:16,018 INFO L82 PathProgramCache]: Analyzing trace with hash 551795688, now seen corresponding path program 6 times [2020-07-20 11:53:16,018 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:53:16,019 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1480595391] [2020-07-20 11:53:16,019 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 [2020-07-20 11:53:16,055 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:53:16,056 INFO L263 TraceCheckSpWp]: Trace formula consists of 168 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-20 11:53:16,059 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:53:16,182 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 72 proven. 20 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2020-07-20 11:53:16,182 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:53:16,308 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 58 proven. 20 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2020-07-20 11:53:16,308 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1480595391] [2020-07-20 11:53:16,309 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:53:16,309 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12] total 17 [2020-07-20 11:53:16,309 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1762478337] [2020-07-20 11:53:16,310 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-20 11:53:16,310 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:53:16,310 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-20 11:53:16,310 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=76, Invalid=196, Unknown=0, NotChecked=0, Total=272 [2020-07-20 11:53:16,311 INFO L87 Difference]: Start difference. First operand 60 states and 65 transitions. Second operand 17 states. [2020-07-20 11:53:16,546 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:53:16,547 INFO L93 Difference]: Finished difference Result 115 states and 135 transitions. [2020-07-20 11:53:16,547 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-20 11:53:16,547 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 65 [2020-07-20 11:53:16,547 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:53:16,548 INFO L225 Difference]: With dead ends: 115 [2020-07-20 11:53:16,549 INFO L226 Difference]: Without dead ends: 82 [2020-07-20 11:53:16,550 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 134 GetRequests, 109 SyntacticMatches, 5 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 86 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=141, Invalid=321, Unknown=0, NotChecked=0, Total=462 [2020-07-20 11:53:16,550 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2020-07-20 11:53:16,556 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 62. [2020-07-20 11:53:16,556 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 62 states. [2020-07-20 11:53:16,557 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 67 transitions. [2020-07-20 11:53:16,557 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 67 transitions. Word has length 65 [2020-07-20 11:53:16,557 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:53:16,558 INFO L479 AbstractCegarLoop]: Abstraction has 62 states and 67 transitions. [2020-07-20 11:53:16,558 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-20 11:53:16,558 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 67 transitions. [2020-07-20 11:53:16,560 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2020-07-20 11:53:16,560 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:53:16,561 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 5, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:53:16,777 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:53:16,778 INFO L427 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:53:16,779 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:53:16,779 INFO L82 PathProgramCache]: Analyzing trace with hash -150434419, now seen corresponding path program 7 times [2020-07-20 11:53:16,780 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:53:16,780 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2102313086] [2020-07-20 11:53:16,781 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 [2020-07-20 11:53:16,819 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:53:16,820 INFO L263 TraceCheckSpWp]: Trace formula consists of 178 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-20 11:53:16,826 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:53:16,965 INFO L134 CoverageAnalysis]: Checked inductivity of 130 backedges. 60 proven. 30 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2020-07-20 11:53:16,965 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:53:17,117 INFO L134 CoverageAnalysis]: Checked inductivity of 130 backedges. 60 proven. 30 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2020-07-20 11:53:17,118 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2102313086] [2020-07-20 11:53:17,118 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:53:17,118 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14] total 20 [2020-07-20 11:53:17,118 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1863957972] [2020-07-20 11:53:17,119 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-07-20 11:53:17,119 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:53:17,119 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-07-20 11:53:17,120 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=103, Invalid=277, Unknown=0, NotChecked=0, Total=380 [2020-07-20 11:53:17,120 INFO L87 Difference]: Start difference. First operand 62 states and 67 transitions. Second operand 20 states. [2020-07-20 11:53:17,391 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:53:17,392 INFO L93 Difference]: Finished difference Result 119 states and 142 transitions. [2020-07-20 11:53:17,392 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-20 11:53:17,392 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 67 [2020-07-20 11:53:17,393 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:53:17,394 INFO L225 Difference]: With dead ends: 119 [2020-07-20 11:53:17,394 INFO L226 Difference]: Without dead ends: 88 [2020-07-20 11:53:17,396 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 139 GetRequests, 109 SyntacticMatches, 6 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 130 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=193, Invalid=457, Unknown=0, NotChecked=0, Total=650 [2020-07-20 11:53:17,397 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2020-07-20 11:53:17,411 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 64. [2020-07-20 11:53:17,412 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 64 states. [2020-07-20 11:53:17,412 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 69 transitions. [2020-07-20 11:53:17,413 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 69 transitions. Word has length 67 [2020-07-20 11:53:17,413 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:53:17,413 INFO L479 AbstractCegarLoop]: Abstraction has 64 states and 69 transitions. [2020-07-20 11:53:17,413 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-07-20 11:53:17,413 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 69 transitions. [2020-07-20 11:53:17,416 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2020-07-20 11:53:17,416 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:53:17,416 INFO L422 BasicCegarLoop]: trace histogram [7, 6, 6, 6, 6, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:53:17,630 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:53:17,631 INFO L427 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:53:17,631 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:53:17,632 INFO L82 PathProgramCache]: Analyzing trace with hash -683701774, now seen corresponding path program 8 times [2020-07-20 11:53:17,632 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:53:17,633 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1613154010] [2020-07-20 11:53:17,633 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 [2020-07-20 11:53:17,670 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:53:17,671 INFO L263 TraceCheckSpWp]: Trace formula consists of 188 conjuncts, 15 conjunts are in the unsatisfiable core [2020-07-20 11:53:17,674 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:53:17,741 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 11:53:17,758 INFO L134 CoverageAnalysis]: Checked inductivity of 142 backedges. 52 proven. 50 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2020-07-20 11:53:17,758 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:53:17,771 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:53:17,858 INFO L134 CoverageAnalysis]: Checked inductivity of 142 backedges. 52 proven. 50 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2020-07-20 11:53:17,859 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1613154010] [2020-07-20 11:53:17,859 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:53:17,859 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 12 [2020-07-20 11:53:17,859 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [173046503] [2020-07-20 11:53:17,860 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-20 11:53:17,860 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:53:17,860 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-20 11:53:17,861 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=83, Unknown=0, NotChecked=0, Total=132 [2020-07-20 11:53:17,861 INFO L87 Difference]: Start difference. First operand 64 states and 69 transitions. Second operand 12 states. [2020-07-20 11:53:17,961 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:53:17,961 INFO L93 Difference]: Finished difference Result 83 states and 90 transitions. [2020-07-20 11:53:17,962 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-20 11:53:17,962 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 69 [2020-07-20 11:53:17,962 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:53:17,963 INFO L225 Difference]: With dead ends: 83 [2020-07-20 11:53:17,963 INFO L226 Difference]: Without dead ends: 81 [2020-07-20 11:53:17,964 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 138 GetRequests, 115 SyntacticMatches, 12 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 77 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=53, Invalid=103, Unknown=0, NotChecked=0, Total=156 [2020-07-20 11:53:17,964 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 81 states. [2020-07-20 11:53:17,970 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 81 to 76. [2020-07-20 11:53:17,970 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 76 states. [2020-07-20 11:53:17,971 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 82 transitions. [2020-07-20 11:53:17,972 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 82 transitions. Word has length 69 [2020-07-20 11:53:17,972 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:53:17,972 INFO L479 AbstractCegarLoop]: Abstraction has 76 states and 82 transitions. [2020-07-20 11:53:17,972 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-20 11:53:17,972 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 82 transitions. [2020-07-20 11:53:17,973 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2020-07-20 11:53:17,974 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:53:17,974 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 8, 7, 7, 7, 7, 7, 7, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:53:18,186 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:53:18,187 INFO L427 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:53:18,188 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:53:18,188 INFO L82 PathProgramCache]: Analyzing trace with hash 192972756, now seen corresponding path program 9 times [2020-07-20 11:53:18,188 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:53:18,189 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [322627578] [2020-07-20 11:53:18,189 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 [2020-07-20 11:53:18,232 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:53:18,234 INFO L263 TraceCheckSpWp]: Trace formula consists of 222 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-20 11:53:18,236 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:53:18,401 INFO L134 CoverageAnalysis]: Checked inductivity of 238 backedges. 132 proven. 42 refuted. 0 times theorem prover too weak. 64 trivial. 0 not checked. [2020-07-20 11:53:18,402 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:53:18,616 INFO L134 CoverageAnalysis]: Checked inductivity of 238 backedges. 110 proven. 42 refuted. 0 times theorem prover too weak. 86 trivial. 0 not checked. [2020-07-20 11:53:18,617 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [322627578] [2020-07-20 11:53:18,617 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:53:18,617 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16] total 23 [2020-07-20 11:53:18,617 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [813673748] [2020-07-20 11:53:18,618 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-20 11:53:18,619 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:53:18,619 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-20 11:53:18,619 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=134, Invalid=372, Unknown=0, NotChecked=0, Total=506 [2020-07-20 11:53:18,623 INFO L87 Difference]: Start difference. First operand 76 states and 82 transitions. Second operand 23 states. [2020-07-20 11:53:18,886 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:53:18,886 INFO L93 Difference]: Finished difference Result 147 states and 174 transitions. [2020-07-20 11:53:18,887 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-07-20 11:53:18,887 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 85 [2020-07-20 11:53:18,887 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:53:18,888 INFO L225 Difference]: With dead ends: 147 [2020-07-20 11:53:18,888 INFO L226 Difference]: Without dead ends: 106 [2020-07-20 11:53:18,890 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 176 GetRequests, 141 SyntacticMatches, 7 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 183 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=253, Invalid=617, Unknown=0, NotChecked=0, Total=870 [2020-07-20 11:53:18,890 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 106 states. [2020-07-20 11:53:18,906 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 106 to 78. [2020-07-20 11:53:18,906 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 78 states. [2020-07-20 11:53:18,907 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 78 states to 78 states and 84 transitions. [2020-07-20 11:53:18,907 INFO L78 Accepts]: Start accepts. Automaton has 78 states and 84 transitions. Word has length 85 [2020-07-20 11:53:18,907 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:53:18,908 INFO L479 AbstractCegarLoop]: Abstraction has 78 states and 84 transitions. [2020-07-20 11:53:18,908 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-20 11:53:18,908 INFO L276 IsEmpty]: Start isEmpty. Operand 78 states and 84 transitions. [2020-07-20 11:53:18,909 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 88 [2020-07-20 11:53:18,909 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:53:18,909 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 8, 8, 7, 7, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:53:19,119 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:53:19,120 INFO L427 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:53:19,120 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:53:19,121 INFO L82 PathProgramCache]: Analyzing trace with hash 1722356985, now seen corresponding path program 10 times [2020-07-20 11:53:19,121 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:53:19,121 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1435807514] [2020-07-20 11:53:19,122 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 [2020-07-20 11:53:19,166 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:53:19,167 INFO L263 TraceCheckSpWp]: Trace formula consists of 232 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-20 11:53:19,170 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:53:19,387 INFO L134 CoverageAnalysis]: Checked inductivity of 252 backedges. 112 proven. 56 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2020-07-20 11:53:19,387 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:53:19,617 INFO L134 CoverageAnalysis]: Checked inductivity of 252 backedges. 112 proven. 56 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2020-07-20 11:53:19,618 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1435807514] [2020-07-20 11:53:19,618 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:53:19,618 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18] total 26 [2020-07-20 11:53:19,618 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1610846464] [2020-07-20 11:53:19,619 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2020-07-20 11:53:19,619 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:53:19,620 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2020-07-20 11:53:19,620 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=169, Invalid=481, Unknown=0, NotChecked=0, Total=650 [2020-07-20 11:53:19,620 INFO L87 Difference]: Start difference. First operand 78 states and 84 transitions. Second operand 26 states. [2020-07-20 11:53:19,955 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:53:19,956 INFO L93 Difference]: Finished difference Result 151 states and 181 transitions. [2020-07-20 11:53:19,956 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-07-20 11:53:19,956 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 87 [2020-07-20 11:53:19,956 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:53:19,958 INFO L225 Difference]: With dead ends: 151 [2020-07-20 11:53:19,958 INFO L226 Difference]: Without dead ends: 112 [2020-07-20 11:53:19,959 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 181 GetRequests, 141 SyntacticMatches, 8 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 245 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=321, Invalid=801, Unknown=0, NotChecked=0, Total=1122 [2020-07-20 11:53:19,960 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 112 states. [2020-07-20 11:53:19,972 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 112 to 80. [2020-07-20 11:53:19,972 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 80 states. [2020-07-20 11:53:19,973 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 86 transitions. [2020-07-20 11:53:19,973 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 86 transitions. Word has length 87 [2020-07-20 11:53:19,973 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:53:19,973 INFO L479 AbstractCegarLoop]: Abstraction has 80 states and 86 transitions. [2020-07-20 11:53:19,973 INFO L480 AbstractCegarLoop]: Interpolant automaton has 26 states. [2020-07-20 11:53:19,973 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 86 transitions. [2020-07-20 11:53:19,974 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 90 [2020-07-20 11:53:19,974 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:53:19,974 INFO L422 BasicCegarLoop]: trace histogram [9, 8, 8, 8, 8, 7, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:53:20,175 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:53:20,176 INFO L427 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:53:20,176 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:53:20,176 INFO L82 PathProgramCache]: Analyzing trace with hash -1713181474, now seen corresponding path program 11 times [2020-07-20 11:53:20,177 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:53:20,177 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1329195211] [2020-07-20 11:53:20,178 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 [2020-07-20 11:53:20,220 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:53:20,221 INFO L263 TraceCheckSpWp]: Trace formula consists of 242 conjuncts, 19 conjunts are in the unsatisfiable core [2020-07-20 11:53:20,223 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:53:20,294 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 11:53:20,317 INFO L134 CoverageAnalysis]: Checked inductivity of 268 backedges. 86 proven. 98 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2020-07-20 11:53:20,317 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:53:20,339 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:53:20,463 INFO L134 CoverageAnalysis]: Checked inductivity of 268 backedges. 86 proven. 98 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2020-07-20 11:53:20,464 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1329195211] [2020-07-20 11:53:20,464 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:53:20,464 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13] total 14 [2020-07-20 11:53:20,464 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [133962373] [2020-07-20 11:53:20,465 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-07-20 11:53:20,465 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:53:20,465 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-07-20 11:53:20,466 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=70, Invalid=112, Unknown=0, NotChecked=0, Total=182 [2020-07-20 11:53:20,466 INFO L87 Difference]: Start difference. First operand 80 states and 86 transitions. Second operand 14 states. [2020-07-20 11:53:20,619 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:53:20,620 INFO L93 Difference]: Finished difference Result 99 states and 107 transitions. [2020-07-20 11:53:20,620 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-20 11:53:20,620 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 89 [2020-07-20 11:53:20,621 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:53:20,622 INFO L225 Difference]: With dead ends: 99 [2020-07-20 11:53:20,622 INFO L226 Difference]: Without dead ends: 97 [2020-07-20 11:53:20,623 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 178 GetRequests, 149 SyntacticMatches, 16 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 119 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=74, Invalid=136, Unknown=0, NotChecked=0, Total=210 [2020-07-20 11:53:20,623 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 97 states. [2020-07-20 11:53:20,628 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 97 to 92. [2020-07-20 11:53:20,629 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 92 states. [2020-07-20 11:53:20,629 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 92 states to 92 states and 99 transitions. [2020-07-20 11:53:20,630 INFO L78 Accepts]: Start accepts. Automaton has 92 states and 99 transitions. Word has length 89 [2020-07-20 11:53:20,630 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:53:20,630 INFO L479 AbstractCegarLoop]: Abstraction has 92 states and 99 transitions. [2020-07-20 11:53:20,630 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-07-20 11:53:20,631 INFO L276 IsEmpty]: Start isEmpty. Operand 92 states and 99 transitions. [2020-07-20 11:53:20,632 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 106 [2020-07-20 11:53:20,632 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:53:20,632 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 10, 9, 9, 9, 9, 9, 9, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:53:20,832 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:53:20,833 INFO L427 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:53:20,833 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:53:20,834 INFO L82 PathProgramCache]: Analyzing trace with hash -1950838080, now seen corresponding path program 12 times [2020-07-20 11:53:20,834 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:53:20,835 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [915337642] [2020-07-20 11:53:20,835 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 [2020-07-20 11:53:20,889 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:53:20,891 INFO L263 TraceCheckSpWp]: Trace formula consists of 276 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-20 11:53:20,893 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:53:21,105 INFO L134 CoverageAnalysis]: Checked inductivity of 396 backedges. 208 proven. 72 refuted. 0 times theorem prover too weak. 116 trivial. 0 not checked. [2020-07-20 11:53:21,106 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:53:21,358 INFO L134 CoverageAnalysis]: Checked inductivity of 396 backedges. 178 proven. 72 refuted. 0 times theorem prover too weak. 146 trivial. 0 not checked. [2020-07-20 11:53:21,358 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [915337642] [2020-07-20 11:53:21,358 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:53:21,358 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20] total 29 [2020-07-20 11:53:21,359 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1424189004] [2020-07-20 11:53:21,359 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-07-20 11:53:21,359 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:53:21,360 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-07-20 11:53:21,360 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=208, Invalid=604, Unknown=0, NotChecked=0, Total=812 [2020-07-20 11:53:21,360 INFO L87 Difference]: Start difference. First operand 92 states and 99 transitions. Second operand 29 states. [2020-07-20 11:53:21,789 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:53:21,789 INFO L93 Difference]: Finished difference Result 179 states and 213 transitions. [2020-07-20 11:53:21,789 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2020-07-20 11:53:21,790 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 105 [2020-07-20 11:53:21,790 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:53:21,791 INFO L225 Difference]: With dead ends: 179 [2020-07-20 11:53:21,791 INFO L226 Difference]: Without dead ends: 130 [2020-07-20 11:53:21,792 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 218 GetRequests, 173 SyntacticMatches, 9 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 316 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=397, Invalid=1009, Unknown=0, NotChecked=0, Total=1406 [2020-07-20 11:53:21,793 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 130 states. [2020-07-20 11:53:21,798 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 130 to 94. [2020-07-20 11:53:21,798 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 94 states. [2020-07-20 11:53:21,799 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 94 states to 94 states and 101 transitions. [2020-07-20 11:53:21,799 INFO L78 Accepts]: Start accepts. Automaton has 94 states and 101 transitions. Word has length 105 [2020-07-20 11:53:21,799 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:53:21,799 INFO L479 AbstractCegarLoop]: Abstraction has 94 states and 101 transitions. [2020-07-20 11:53:21,799 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-07-20 11:53:21,799 INFO L276 IsEmpty]: Start isEmpty. Operand 94 states and 101 transitions. [2020-07-20 11:53:21,800 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 108 [2020-07-20 11:53:21,800 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:53:21,800 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 10, 10, 9, 9, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:53:22,004 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:53:22,005 INFO L427 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:53:22,005 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:53:22,006 INFO L82 PathProgramCache]: Analyzing trace with hash -734782619, now seen corresponding path program 13 times [2020-07-20 11:53:22,006 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:53:22,006 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [38766773] [2020-07-20 11:53:22,007 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 [2020-07-20 11:53:22,053 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:53:22,055 INFO L263 TraceCheckSpWp]: Trace formula consists of 286 conjuncts, 22 conjunts are in the unsatisfiable core [2020-07-20 11:53:22,058 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:53:22,313 INFO L134 CoverageAnalysis]: Checked inductivity of 414 backedges. 180 proven. 90 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2020-07-20 11:53:22,313 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:53:22,603 INFO L134 CoverageAnalysis]: Checked inductivity of 414 backedges. 180 proven. 90 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2020-07-20 11:53:22,604 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [38766773] [2020-07-20 11:53:22,604 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:53:22,604 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22] total 32 [2020-07-20 11:53:22,604 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [463056554] [2020-07-20 11:53:22,605 INFO L459 AbstractCegarLoop]: Interpolant automaton has 32 states [2020-07-20 11:53:22,605 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:53:22,605 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2020-07-20 11:53:22,606 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=251, Invalid=741, Unknown=0, NotChecked=0, Total=992 [2020-07-20 11:53:22,606 INFO L87 Difference]: Start difference. First operand 94 states and 101 transitions. Second operand 32 states. [2020-07-20 11:53:23,069 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:53:23,070 INFO L93 Difference]: Finished difference Result 183 states and 220 transitions. [2020-07-20 11:53:23,070 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-07-20 11:53:23,070 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 107 [2020-07-20 11:53:23,071 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:53:23,072 INFO L225 Difference]: With dead ends: 183 [2020-07-20 11:53:23,072 INFO L226 Difference]: Without dead ends: 136 [2020-07-20 11:53:23,073 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 223 GetRequests, 173 SyntacticMatches, 10 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 396 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=481, Invalid=1241, Unknown=0, NotChecked=0, Total=1722 [2020-07-20 11:53:23,073 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 136 states. [2020-07-20 11:53:23,078 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 136 to 96. [2020-07-20 11:53:23,079 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 96 states. [2020-07-20 11:53:23,079 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 96 states to 96 states and 103 transitions. [2020-07-20 11:53:23,080 INFO L78 Accepts]: Start accepts. Automaton has 96 states and 103 transitions. Word has length 107 [2020-07-20 11:53:23,080 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:53:23,080 INFO L479 AbstractCegarLoop]: Abstraction has 96 states and 103 transitions. [2020-07-20 11:53:23,080 INFO L480 AbstractCegarLoop]: Interpolant automaton has 32 states. [2020-07-20 11:53:23,080 INFO L276 IsEmpty]: Start isEmpty. Operand 96 states and 103 transitions. [2020-07-20 11:53:23,081 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 110 [2020-07-20 11:53:23,081 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:53:23,082 INFO L422 BasicCegarLoop]: trace histogram [11, 10, 10, 10, 10, 9, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:53:23,288 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:53:23,289 INFO L427 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:53:23,289 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:53:23,290 INFO L82 PathProgramCache]: Analyzing trace with hash -336589110, now seen corresponding path program 14 times [2020-07-20 11:53:23,290 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:53:23,290 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1623921511] [2020-07-20 11:53:23,291 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 [2020-07-20 11:53:23,337 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:53:23,338 INFO L263 TraceCheckSpWp]: Trace formula consists of 296 conjuncts, 23 conjunts are in the unsatisfiable core [2020-07-20 11:53:23,340 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:53:23,439 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 11:53:23,465 INFO L134 CoverageAnalysis]: Checked inductivity of 434 backedges. 128 proven. 162 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2020-07-20 11:53:23,465 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:53:23,482 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:53:23,645 INFO L134 CoverageAnalysis]: Checked inductivity of 434 backedges. 128 proven. 162 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2020-07-20 11:53:23,646 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1623921511] [2020-07-20 11:53:23,646 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:53:23,646 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15] total 16 [2020-07-20 11:53:23,646 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1327125388] [2020-07-20 11:53:23,647 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-07-20 11:53:23,647 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:53:23,647 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-07-20 11:53:23,647 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=95, Invalid=145, Unknown=0, NotChecked=0, Total=240 [2020-07-20 11:53:23,647 INFO L87 Difference]: Start difference. First operand 96 states and 103 transitions. Second operand 16 states. [2020-07-20 11:53:23,782 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:53:23,783 INFO L93 Difference]: Finished difference Result 115 states and 124 transitions. [2020-07-20 11:53:23,783 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-07-20 11:53:23,783 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 109 [2020-07-20 11:53:23,784 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:53:23,785 INFO L225 Difference]: With dead ends: 115 [2020-07-20 11:53:23,785 INFO L226 Difference]: Without dead ends: 113 [2020-07-20 11:53:23,785 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 218 GetRequests, 183 SyntacticMatches, 20 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 169 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=99, Invalid=173, Unknown=0, NotChecked=0, Total=272 [2020-07-20 11:53:23,786 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 113 states. [2020-07-20 11:53:23,791 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 113 to 108. [2020-07-20 11:53:23,791 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 108 states. [2020-07-20 11:53:23,792 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 108 states to 108 states and 116 transitions. [2020-07-20 11:53:23,792 INFO L78 Accepts]: Start accepts. Automaton has 108 states and 116 transitions. Word has length 109 [2020-07-20 11:53:23,793 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:53:23,793 INFO L479 AbstractCegarLoop]: Abstraction has 108 states and 116 transitions. [2020-07-20 11:53:23,793 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-07-20 11:53:23,793 INFO L276 IsEmpty]: Start isEmpty. Operand 108 states and 116 transitions. [2020-07-20 11:53:23,794 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 126 [2020-07-20 11:53:23,794 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:53:23,795 INFO L422 BasicCegarLoop]: trace histogram [12, 12, 12, 11, 11, 11, 11, 11, 11, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:53:24,008 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:53:24,009 INFO L427 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:53:24,009 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:53:24,010 INFO L82 PathProgramCache]: Analyzing trace with hash 1711037612, now seen corresponding path program 15 times [2020-07-20 11:53:24,010 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:53:24,010 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1326186402] [2020-07-20 11:53:24,010 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 [2020-07-20 11:53:24,064 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:53:24,065 INFO L263 TraceCheckSpWp]: Trace formula consists of 330 conjuncts, 24 conjunts are in the unsatisfiable core [2020-07-20 11:53:24,068 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:53:24,356 INFO L134 CoverageAnalysis]: Checked inductivity of 594 backedges. 300 proven. 110 refuted. 0 times theorem prover too weak. 184 trivial. 0 not checked. [2020-07-20 11:53:24,357 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:53:24,728 INFO L134 CoverageAnalysis]: Checked inductivity of 594 backedges. 262 proven. 110 refuted. 0 times theorem prover too weak. 222 trivial. 0 not checked. [2020-07-20 11:53:24,729 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1326186402] [2020-07-20 11:53:24,729 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:53:24,729 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24] total 35 [2020-07-20 11:53:24,729 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1257555330] [2020-07-20 11:53:24,730 INFO L459 AbstractCegarLoop]: Interpolant automaton has 35 states [2020-07-20 11:53:24,730 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:53:24,730 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2020-07-20 11:53:24,731 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=298, Invalid=892, Unknown=0, NotChecked=0, Total=1190 [2020-07-20 11:53:24,731 INFO L87 Difference]: Start difference. First operand 108 states and 116 transitions. Second operand 35 states. [2020-07-20 11:53:25,261 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:53:25,262 INFO L93 Difference]: Finished difference Result 211 states and 252 transitions. [2020-07-20 11:53:25,262 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2020-07-20 11:53:25,262 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 125 [2020-07-20 11:53:25,262 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:53:25,263 INFO L225 Difference]: With dead ends: 211 [2020-07-20 11:53:25,264 INFO L226 Difference]: Without dead ends: 154 [2020-07-20 11:53:25,265 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 260 GetRequests, 205 SyntacticMatches, 11 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 485 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=573, Invalid=1497, Unknown=0, NotChecked=0, Total=2070 [2020-07-20 11:53:25,265 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 154 states. [2020-07-20 11:53:25,271 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 154 to 110. [2020-07-20 11:53:25,271 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 110 states. [2020-07-20 11:53:25,272 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 110 states to 110 states and 118 transitions. [2020-07-20 11:53:25,272 INFO L78 Accepts]: Start accepts. Automaton has 110 states and 118 transitions. Word has length 125 [2020-07-20 11:53:25,272 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:53:25,272 INFO L479 AbstractCegarLoop]: Abstraction has 110 states and 118 transitions. [2020-07-20 11:53:25,272 INFO L480 AbstractCegarLoop]: Interpolant automaton has 35 states. [2020-07-20 11:53:25,273 INFO L276 IsEmpty]: Start isEmpty. Operand 110 states and 118 transitions. [2020-07-20 11:53:25,274 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 128 [2020-07-20 11:53:25,274 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:53:25,274 INFO L422 BasicCegarLoop]: trace histogram [12, 12, 12, 12, 11, 11, 11, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:53:25,475 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:53:25,475 INFO L427 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:53:25,475 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:53:25,476 INFO L82 PathProgramCache]: Analyzing trace with hash 66724049, now seen corresponding path program 16 times [2020-07-20 11:53:25,476 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:53:25,476 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [919618952] [2020-07-20 11:53:25,477 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 [2020-07-20 11:53:25,533 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:53:25,534 INFO L263 TraceCheckSpWp]: Trace formula consists of 340 conjuncts, 26 conjunts are in the unsatisfiable core [2020-07-20 11:53:25,536 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:53:25,877 INFO L134 CoverageAnalysis]: Checked inductivity of 616 backedges. 264 proven. 132 refuted. 0 times theorem prover too weak. 220 trivial. 0 not checked. [2020-07-20 11:53:25,877 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:53:26,347 INFO L134 CoverageAnalysis]: Checked inductivity of 616 backedges. 264 proven. 132 refuted. 0 times theorem prover too weak. 220 trivial. 0 not checked. [2020-07-20 11:53:26,348 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [919618952] [2020-07-20 11:53:26,348 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:53:26,348 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26] total 38 [2020-07-20 11:53:26,348 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [205974504] [2020-07-20 11:53:26,351 INFO L459 AbstractCegarLoop]: Interpolant automaton has 38 states [2020-07-20 11:53:26,351 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:53:26,352 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2020-07-20 11:53:26,353 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=349, Invalid=1057, Unknown=0, NotChecked=0, Total=1406 [2020-07-20 11:53:26,353 INFO L87 Difference]: Start difference. First operand 110 states and 118 transitions. Second operand 38 states. [2020-07-20 11:53:26,872 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:53:26,872 INFO L93 Difference]: Finished difference Result 215 states and 259 transitions. [2020-07-20 11:53:26,873 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2020-07-20 11:53:26,873 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 127 [2020-07-20 11:53:26,873 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:53:26,874 INFO L225 Difference]: With dead ends: 215 [2020-07-20 11:53:26,874 INFO L226 Difference]: Without dead ends: 160 [2020-07-20 11:53:26,876 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 265 GetRequests, 205 SyntacticMatches, 12 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 583 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=673, Invalid=1777, Unknown=0, NotChecked=0, Total=2450 [2020-07-20 11:53:26,876 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 160 states. [2020-07-20 11:53:26,882 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 160 to 112. [2020-07-20 11:53:26,882 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 112 states. [2020-07-20 11:53:26,883 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 112 states to 112 states and 120 transitions. [2020-07-20 11:53:26,883 INFO L78 Accepts]: Start accepts. Automaton has 112 states and 120 transitions. Word has length 127 [2020-07-20 11:53:26,883 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:53:26,883 INFO L479 AbstractCegarLoop]: Abstraction has 112 states and 120 transitions. [2020-07-20 11:53:26,883 INFO L480 AbstractCegarLoop]: Interpolant automaton has 38 states. [2020-07-20 11:53:26,884 INFO L276 IsEmpty]: Start isEmpty. Operand 112 states and 120 transitions. [2020-07-20 11:53:26,885 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 130 [2020-07-20 11:53:26,885 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:53:26,885 INFO L422 BasicCegarLoop]: trace histogram [13, 12, 12, 12, 12, 11, 11, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:53:27,094 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:53:27,094 INFO L427 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:53:27,094 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:53:27,095 INFO L82 PathProgramCache]: Analyzing trace with hash 429354934, now seen corresponding path program 17 times [2020-07-20 11:53:27,095 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:53:27,095 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1945441185] [2020-07-20 11:53:27,096 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 [2020-07-20 11:53:27,154 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:53:27,156 INFO L263 TraceCheckSpWp]: Trace formula consists of 350 conjuncts, 27 conjunts are in the unsatisfiable core [2020-07-20 11:53:27,157 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:53:27,277 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 11:53:27,310 INFO L134 CoverageAnalysis]: Checked inductivity of 640 backedges. 178 proven. 242 refuted. 0 times theorem prover too weak. 220 trivial. 0 not checked. [2020-07-20 11:53:27,310 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:53:27,329 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:53:27,601 INFO L134 CoverageAnalysis]: Checked inductivity of 640 backedges. 178 proven. 242 refuted. 0 times theorem prover too weak. 220 trivial. 0 not checked. [2020-07-20 11:53:27,602 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1945441185] [2020-07-20 11:53:27,602 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:53:27,602 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17] total 18 [2020-07-20 11:53:27,603 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [886423003] [2020-07-20 11:53:27,603 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-07-20 11:53:27,603 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:53:27,604 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-07-20 11:53:27,604 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=124, Invalid=182, Unknown=0, NotChecked=0, Total=306 [2020-07-20 11:53:27,604 INFO L87 Difference]: Start difference. First operand 112 states and 120 transitions. Second operand 18 states. [2020-07-20 11:53:27,755 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:53:27,756 INFO L93 Difference]: Finished difference Result 131 states and 141 transitions. [2020-07-20 11:53:27,758 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-07-20 11:53:27,758 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 129 [2020-07-20 11:53:27,759 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:53:27,760 INFO L225 Difference]: With dead ends: 131 [2020-07-20 11:53:27,760 INFO L226 Difference]: Without dead ends: 129 [2020-07-20 11:53:27,761 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 258 GetRequests, 217 SyntacticMatches, 24 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 227 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=128, Invalid=214, Unknown=0, NotChecked=0, Total=342 [2020-07-20 11:53:27,761 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 129 states. [2020-07-20 11:53:27,767 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 129 to 124. [2020-07-20 11:53:27,768 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 124 states. [2020-07-20 11:53:27,768 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 124 states to 124 states and 133 transitions. [2020-07-20 11:53:27,769 INFO L78 Accepts]: Start accepts. Automaton has 124 states and 133 transitions. Word has length 129 [2020-07-20 11:53:27,769 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:53:27,769 INFO L479 AbstractCegarLoop]: Abstraction has 124 states and 133 transitions. [2020-07-20 11:53:27,769 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-07-20 11:53:27,769 INFO L276 IsEmpty]: Start isEmpty. Operand 124 states and 133 transitions. [2020-07-20 11:53:27,771 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 146 [2020-07-20 11:53:27,771 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:53:27,771 INFO L422 BasicCegarLoop]: trace histogram [14, 14, 14, 13, 13, 13, 13, 13, 13, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:53:27,986 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:53:27,987 INFO L427 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:53:27,987 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:53:27,988 INFO L82 PathProgramCache]: Analyzing trace with hash 1971086744, now seen corresponding path program 18 times [2020-07-20 11:53:27,988 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:53:27,988 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1148011641] [2020-07-20 11:53:27,988 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 [2020-07-20 11:53:28,048 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:53:28,050 INFO L263 TraceCheckSpWp]: Trace formula consists of 384 conjuncts, 28 conjunts are in the unsatisfiable core [2020-07-20 11:53:28,051 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:53:28,437 INFO L134 CoverageAnalysis]: Checked inductivity of 832 backedges. 408 proven. 156 refuted. 0 times theorem prover too weak. 268 trivial. 0 not checked. [2020-07-20 11:53:28,438 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:53:29,050 INFO L134 CoverageAnalysis]: Checked inductivity of 832 backedges. 362 proven. 156 refuted. 0 times theorem prover too weak. 314 trivial. 0 not checked. [2020-07-20 11:53:29,051 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1148011641] [2020-07-20 11:53:29,051 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:53:29,052 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 28] total 41 [2020-07-20 11:53:29,052 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1676085287] [2020-07-20 11:53:29,059 INFO L459 AbstractCegarLoop]: Interpolant automaton has 41 states [2020-07-20 11:53:29,060 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:53:29,060 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2020-07-20 11:53:29,061 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=404, Invalid=1236, Unknown=0, NotChecked=0, Total=1640 [2020-07-20 11:53:29,061 INFO L87 Difference]: Start difference. First operand 124 states and 133 transitions. Second operand 41 states. [2020-07-20 11:53:29,736 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:53:29,736 INFO L93 Difference]: Finished difference Result 243 states and 291 transitions. [2020-07-20 11:53:29,736 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2020-07-20 11:53:29,737 INFO L78 Accepts]: Start accepts. Automaton has 41 states. Word has length 145 [2020-07-20 11:53:29,737 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:53:29,739 INFO L225 Difference]: With dead ends: 243 [2020-07-20 11:53:29,739 INFO L226 Difference]: Without dead ends: 178 [2020-07-20 11:53:29,741 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 302 GetRequests, 237 SyntacticMatches, 13 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 690 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=781, Invalid=2081, Unknown=0, NotChecked=0, Total=2862 [2020-07-20 11:53:29,741 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 178 states. [2020-07-20 11:53:29,749 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 178 to 126. [2020-07-20 11:53:29,749 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 126 states. [2020-07-20 11:53:29,750 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 126 states to 126 states and 135 transitions. [2020-07-20 11:53:29,750 INFO L78 Accepts]: Start accepts. Automaton has 126 states and 135 transitions. Word has length 145 [2020-07-20 11:53:29,751 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:53:29,751 INFO L479 AbstractCegarLoop]: Abstraction has 126 states and 135 transitions. [2020-07-20 11:53:29,751 INFO L480 AbstractCegarLoop]: Interpolant automaton has 41 states. [2020-07-20 11:53:29,751 INFO L276 IsEmpty]: Start isEmpty. Operand 126 states and 135 transitions. [2020-07-20 11:53:29,752 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 148 [2020-07-20 11:53:29,752 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:53:29,753 INFO L422 BasicCegarLoop]: trace histogram [14, 14, 14, 14, 13, 13, 13, 13, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:53:29,966 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:53:29,967 INFO L427 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:53:29,967 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:53:29,967 INFO L82 PathProgramCache]: Analyzing trace with hash 554411325, now seen corresponding path program 19 times [2020-07-20 11:53:29,967 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:53:29,967 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [888442909] [2020-07-20 11:53:29,967 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 [2020-07-20 11:53:30,034 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:53:30,035 INFO L263 TraceCheckSpWp]: Trace formula consists of 394 conjuncts, 30 conjunts are in the unsatisfiable core [2020-07-20 11:53:30,037 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:53:30,520 INFO L134 CoverageAnalysis]: Checked inductivity of 858 backedges. 364 proven. 182 refuted. 0 times theorem prover too weak. 312 trivial. 0 not checked. [2020-07-20 11:53:30,520 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:53:31,056 INFO L134 CoverageAnalysis]: Checked inductivity of 858 backedges. 364 proven. 182 refuted. 0 times theorem prover too weak. 312 trivial. 0 not checked. [2020-07-20 11:53:31,056 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [888442909] [2020-07-20 11:53:31,056 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:53:31,057 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 30] total 44 [2020-07-20 11:53:31,057 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [846373456] [2020-07-20 11:53:31,057 INFO L459 AbstractCegarLoop]: Interpolant automaton has 44 states [2020-07-20 11:53:31,058 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:53:31,058 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2020-07-20 11:53:31,059 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=463, Invalid=1429, Unknown=0, NotChecked=0, Total=1892 [2020-07-20 11:53:31,059 INFO L87 Difference]: Start difference. First operand 126 states and 135 transitions. Second operand 44 states. [2020-07-20 11:53:31,733 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:53:31,733 INFO L93 Difference]: Finished difference Result 247 states and 298 transitions. [2020-07-20 11:53:31,734 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2020-07-20 11:53:31,734 INFO L78 Accepts]: Start accepts. Automaton has 44 states. Word has length 147 [2020-07-20 11:53:31,735 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:53:31,736 INFO L225 Difference]: With dead ends: 247 [2020-07-20 11:53:31,736 INFO L226 Difference]: Without dead ends: 184 [2020-07-20 11:53:31,738 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 307 GetRequests, 237 SyntacticMatches, 14 SemanticMatches, 56 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 806 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=897, Invalid=2409, Unknown=0, NotChecked=0, Total=3306 [2020-07-20 11:53:31,738 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 184 states. [2020-07-20 11:53:31,744 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 184 to 128. [2020-07-20 11:53:31,744 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 128 states. [2020-07-20 11:53:31,745 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 128 states to 128 states and 137 transitions. [2020-07-20 11:53:31,745 INFO L78 Accepts]: Start accepts. Automaton has 128 states and 137 transitions. Word has length 147 [2020-07-20 11:53:31,746 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:53:31,746 INFO L479 AbstractCegarLoop]: Abstraction has 128 states and 137 transitions. [2020-07-20 11:53:31,746 INFO L480 AbstractCegarLoop]: Interpolant automaton has 44 states. [2020-07-20 11:53:31,746 INFO L276 IsEmpty]: Start isEmpty. Operand 128 states and 137 transitions. [2020-07-20 11:53:31,749 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 150 [2020-07-20 11:53:31,749 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:53:31,749 INFO L422 BasicCegarLoop]: trace histogram [15, 14, 14, 14, 14, 13, 13, 13, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:53:31,962 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:53:31,963 INFO L427 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:53:31,963 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:53:31,964 INFO L82 PathProgramCache]: Analyzing trace with hash 633966498, now seen corresponding path program 20 times [2020-07-20 11:53:31,964 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:53:31,964 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [862489531] [2020-07-20 11:53:31,964 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 24 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:53:32,030 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:53:32,031 INFO L263 TraceCheckSpWp]: Trace formula consists of 404 conjuncts, 31 conjunts are in the unsatisfiable core [2020-07-20 11:53:32,033 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:53:32,189 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 11:53:32,225 INFO L134 CoverageAnalysis]: Checked inductivity of 886 backedges. 236 proven. 338 refuted. 0 times theorem prover too weak. 312 trivial. 0 not checked. [2020-07-20 11:53:32,225 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:53:32,245 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:53:32,539 INFO L134 CoverageAnalysis]: Checked inductivity of 886 backedges. 236 proven. 338 refuted. 0 times theorem prover too weak. 312 trivial. 0 not checked. [2020-07-20 11:53:32,540 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [862489531] [2020-07-20 11:53:32,540 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:53:32,540 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19] total 20 [2020-07-20 11:53:32,540 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [304426524] [2020-07-20 11:53:32,541 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-07-20 11:53:32,541 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:53:32,541 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-07-20 11:53:32,541 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=157, Invalid=223, Unknown=0, NotChecked=0, Total=380 [2020-07-20 11:53:32,541 INFO L87 Difference]: Start difference. First operand 128 states and 137 transitions. Second operand 20 states. [2020-07-20 11:53:32,748 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:53:32,749 INFO L93 Difference]: Finished difference Result 147 states and 158 transitions. [2020-07-20 11:53:32,749 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2020-07-20 11:53:32,749 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 149 [2020-07-20 11:53:32,750 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:53:32,750 INFO L225 Difference]: With dead ends: 147 [2020-07-20 11:53:32,751 INFO L226 Difference]: Without dead ends: 145 [2020-07-20 11:53:32,751 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 298 GetRequests, 251 SyntacticMatches, 28 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 293 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=161, Invalid=259, Unknown=0, NotChecked=0, Total=420 [2020-07-20 11:53:32,752 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 145 states. [2020-07-20 11:53:32,758 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 145 to 140. [2020-07-20 11:53:32,758 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 140 states. [2020-07-20 11:53:32,759 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 140 states to 140 states and 150 transitions. [2020-07-20 11:53:32,759 INFO L78 Accepts]: Start accepts. Automaton has 140 states and 150 transitions. Word has length 149 [2020-07-20 11:53:32,760 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:53:32,760 INFO L479 AbstractCegarLoop]: Abstraction has 140 states and 150 transitions. [2020-07-20 11:53:32,760 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-07-20 11:53:32,760 INFO L276 IsEmpty]: Start isEmpty. Operand 140 states and 150 transitions. [2020-07-20 11:53:32,761 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 166 [2020-07-20 11:53:32,762 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:53:32,762 INFO L422 BasicCegarLoop]: trace histogram [16, 16, 16, 15, 15, 15, 15, 15, 15, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:53:32,974 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:53:32,975 INFO L427 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:53:32,975 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:53:32,976 INFO L82 PathProgramCache]: Analyzing trace with hash -869716604, now seen corresponding path program 21 times [2020-07-20 11:53:32,976 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:53:32,976 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [674790928] [2020-07-20 11:53:32,977 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 25 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:53:33,046 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:53:33,048 INFO L263 TraceCheckSpWp]: Trace formula consists of 438 conjuncts, 32 conjunts are in the unsatisfiable core [2020-07-20 11:53:33,050 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:53:33,555 INFO L134 CoverageAnalysis]: Checked inductivity of 1110 backedges. 532 proven. 210 refuted. 0 times theorem prover too weak. 368 trivial. 0 not checked. [2020-07-20 11:53:33,555 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:53:34,149 INFO L134 CoverageAnalysis]: Checked inductivity of 1110 backedges. 478 proven. 210 refuted. 0 times theorem prover too weak. 422 trivial. 0 not checked. [2020-07-20 11:53:34,149 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [674790928] [2020-07-20 11:53:34,149 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:53:34,149 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 32] total 47 [2020-07-20 11:53:34,149 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [476567320] [2020-07-20 11:53:34,150 INFO L459 AbstractCegarLoop]: Interpolant automaton has 47 states [2020-07-20 11:53:34,150 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:53:34,150 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2020-07-20 11:53:34,151 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=526, Invalid=1636, Unknown=0, NotChecked=0, Total=2162 [2020-07-20 11:53:34,151 INFO L87 Difference]: Start difference. First operand 140 states and 150 transitions. Second operand 47 states. [2020-07-20 11:53:34,922 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:53:34,922 INFO L93 Difference]: Finished difference Result 275 states and 330 transitions. [2020-07-20 11:53:34,922 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2020-07-20 11:53:34,923 INFO L78 Accepts]: Start accepts. Automaton has 47 states. Word has length 165 [2020-07-20 11:53:34,924 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:53:34,925 INFO L225 Difference]: With dead ends: 275 [2020-07-20 11:53:34,925 INFO L226 Difference]: Without dead ends: 202 [2020-07-20 11:53:34,927 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 344 GetRequests, 269 SyntacticMatches, 15 SemanticMatches, 60 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 931 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=1021, Invalid=2761, Unknown=0, NotChecked=0, Total=3782 [2020-07-20 11:53:34,928 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 202 states. [2020-07-20 11:53:34,934 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 202 to 142. [2020-07-20 11:53:34,934 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 142 states. [2020-07-20 11:53:34,935 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 142 states to 142 states and 152 transitions. [2020-07-20 11:53:34,935 INFO L78 Accepts]: Start accepts. Automaton has 142 states and 152 transitions. Word has length 165 [2020-07-20 11:53:34,935 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:53:34,935 INFO L479 AbstractCegarLoop]: Abstraction has 142 states and 152 transitions. [2020-07-20 11:53:34,936 INFO L480 AbstractCegarLoop]: Interpolant automaton has 47 states. [2020-07-20 11:53:34,936 INFO L276 IsEmpty]: Start isEmpty. Operand 142 states and 152 transitions. [2020-07-20 11:53:34,937 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 168 [2020-07-20 11:53:34,937 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:53:34,937 INFO L422 BasicCegarLoop]: trace histogram [16, 16, 16, 16, 15, 15, 15, 15, 15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:53:35,151 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:53:35,151 INFO L427 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:53:35,151 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:53:35,152 INFO L82 PathProgramCache]: Analyzing trace with hash -583456599, now seen corresponding path program 22 times [2020-07-20 11:53:35,152 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:53:35,153 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1809783302] [2020-07-20 11:53:35,153 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 26 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 26 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:53:35,219 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:53:35,220 INFO L263 TraceCheckSpWp]: Trace formula consists of 448 conjuncts, 34 conjunts are in the unsatisfiable core [2020-07-20 11:53:35,223 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:53:35,801 INFO L134 CoverageAnalysis]: Checked inductivity of 1140 backedges. 480 proven. 240 refuted. 0 times theorem prover too weak. 420 trivial. 0 not checked. [2020-07-20 11:53:35,802 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:53:36,456 INFO L134 CoverageAnalysis]: Checked inductivity of 1140 backedges. 480 proven. 240 refuted. 0 times theorem prover too weak. 420 trivial. 0 not checked. [2020-07-20 11:53:36,457 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1809783302] [2020-07-20 11:53:36,457 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:53:36,457 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 34] total 50 [2020-07-20 11:53:36,457 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1031070479] [2020-07-20 11:53:36,458 INFO L459 AbstractCegarLoop]: Interpolant automaton has 50 states [2020-07-20 11:53:36,458 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:53:36,458 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2020-07-20 11:53:36,459 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=593, Invalid=1857, Unknown=0, NotChecked=0, Total=2450 [2020-07-20 11:53:36,459 INFO L87 Difference]: Start difference. First operand 142 states and 152 transitions. Second operand 50 states. [2020-07-20 11:53:37,441 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:53:37,442 INFO L93 Difference]: Finished difference Result 279 states and 337 transitions. [2020-07-20 11:53:37,442 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2020-07-20 11:53:37,442 INFO L78 Accepts]: Start accepts. Automaton has 50 states. Word has length 167 [2020-07-20 11:53:37,443 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:53:37,445 INFO L225 Difference]: With dead ends: 279 [2020-07-20 11:53:37,445 INFO L226 Difference]: Without dead ends: 208 [2020-07-20 11:53:37,448 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 349 GetRequests, 269 SyntacticMatches, 16 SemanticMatches, 64 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1065 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=1153, Invalid=3137, Unknown=0, NotChecked=0, Total=4290 [2020-07-20 11:53:37,449 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 208 states. [2020-07-20 11:53:37,460 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 208 to 144. [2020-07-20 11:53:37,460 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 144 states. [2020-07-20 11:53:37,466 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 144 states to 144 states and 154 transitions. [2020-07-20 11:53:37,466 INFO L78 Accepts]: Start accepts. Automaton has 144 states and 154 transitions. Word has length 167 [2020-07-20 11:53:37,467 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:53:37,467 INFO L479 AbstractCegarLoop]: Abstraction has 144 states and 154 transitions. [2020-07-20 11:53:37,467 INFO L480 AbstractCegarLoop]: Interpolant automaton has 50 states. [2020-07-20 11:53:37,467 INFO L276 IsEmpty]: Start isEmpty. Operand 144 states and 154 transitions. [2020-07-20 11:53:37,469 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 170 [2020-07-20 11:53:37,469 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:53:37,469 INFO L422 BasicCegarLoop]: trace histogram [17, 16, 16, 16, 16, 15, 15, 15, 15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:53:37,684 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:53:37,685 INFO L427 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:53:37,685 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:53:37,685 INFO L82 PathProgramCache]: Analyzing trace with hash -365498738, now seen corresponding path program 23 times [2020-07-20 11:53:37,685 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:53:37,686 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1675825733] [2020-07-20 11:53:37,686 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 27 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 27 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:53:37,758 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:53:37,759 INFO L263 TraceCheckSpWp]: Trace formula consists of 458 conjuncts, 35 conjunts are in the unsatisfiable core [2020-07-20 11:53:37,761 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:53:37,949 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 11:53:37,990 INFO L134 CoverageAnalysis]: Checked inductivity of 1172 backedges. 302 proven. 450 refuted. 0 times theorem prover too weak. 420 trivial. 0 not checked. [2020-07-20 11:53:37,991 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:53:38,014 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:53:38,389 INFO L134 CoverageAnalysis]: Checked inductivity of 1172 backedges. 302 proven. 450 refuted. 0 times theorem prover too weak. 420 trivial. 0 not checked. [2020-07-20 11:53:38,389 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1675825733] [2020-07-20 11:53:38,389 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:53:38,389 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21] total 22 [2020-07-20 11:53:38,390 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [534468711] [2020-07-20 11:53:38,390 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-07-20 11:53:38,390 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:53:38,390 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-07-20 11:53:38,391 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=194, Invalid=268, Unknown=0, NotChecked=0, Total=462 [2020-07-20 11:53:38,391 INFO L87 Difference]: Start difference. First operand 144 states and 154 transitions. Second operand 22 states. [2020-07-20 11:53:38,618 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:53:38,618 INFO L93 Difference]: Finished difference Result 163 states and 175 transitions. [2020-07-20 11:53:38,618 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-07-20 11:53:38,619 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 169 [2020-07-20 11:53:38,619 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:53:38,620 INFO L225 Difference]: With dead ends: 163 [2020-07-20 11:53:38,620 INFO L226 Difference]: Without dead ends: 161 [2020-07-20 11:53:38,624 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 338 GetRequests, 285 SyntacticMatches, 32 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 367 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=198, Invalid=308, Unknown=0, NotChecked=0, Total=506 [2020-07-20 11:53:38,624 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 161 states. [2020-07-20 11:53:38,640 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 161 to 156. [2020-07-20 11:53:38,640 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 156 states. [2020-07-20 11:53:38,646 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 156 states to 156 states and 167 transitions. [2020-07-20 11:53:38,646 INFO L78 Accepts]: Start accepts. Automaton has 156 states and 167 transitions. Word has length 169 [2020-07-20 11:53:38,647 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:53:38,647 INFO L479 AbstractCegarLoop]: Abstraction has 156 states and 167 transitions. [2020-07-20 11:53:38,647 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-07-20 11:53:38,647 INFO L276 IsEmpty]: Start isEmpty. Operand 156 states and 167 transitions. [2020-07-20 11:53:38,649 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 186 [2020-07-20 11:53:38,649 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:53:38,650 INFO L422 BasicCegarLoop]: trace histogram [18, 18, 18, 17, 17, 17, 17, 17, 17, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:53:38,865 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:53:38,866 INFO L427 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:53:38,866 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:53:38,867 INFO L82 PathProgramCache]: Analyzing trace with hash -760007568, now seen corresponding path program 24 times [2020-07-20 11:53:38,867 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:53:38,867 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1411711294] [2020-07-20 11:53:38,867 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 28 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 28 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:53:38,952 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:53:38,954 INFO L263 TraceCheckSpWp]: Trace formula consists of 492 conjuncts, 36 conjunts are in the unsatisfiable core [2020-07-20 11:53:38,959 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:53:39,582 INFO L134 CoverageAnalysis]: Checked inductivity of 1428 backedges. 672 proven. 272 refuted. 0 times theorem prover too weak. 484 trivial. 0 not checked. [2020-07-20 11:53:39,582 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:53:40,349 INFO L134 CoverageAnalysis]: Checked inductivity of 1428 backedges. 610 proven. 272 refuted. 0 times theorem prover too weak. 546 trivial. 0 not checked. [2020-07-20 11:53:40,350 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1411711294] [2020-07-20 11:53:40,350 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:53:40,350 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36, 36] total 53 [2020-07-20 11:53:40,350 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [478063489] [2020-07-20 11:53:40,351 INFO L459 AbstractCegarLoop]: Interpolant automaton has 53 states [2020-07-20 11:53:40,351 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:53:40,351 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2020-07-20 11:53:40,352 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=664, Invalid=2092, Unknown=0, NotChecked=0, Total=2756 [2020-07-20 11:53:40,352 INFO L87 Difference]: Start difference. First operand 156 states and 167 transitions. Second operand 53 states. [2020-07-20 11:53:41,422 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:53:41,422 INFO L93 Difference]: Finished difference Result 307 states and 369 transitions. [2020-07-20 11:53:41,422 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2020-07-20 11:53:41,423 INFO L78 Accepts]: Start accepts. Automaton has 53 states. Word has length 185 [2020-07-20 11:53:41,423 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:53:41,425 INFO L225 Difference]: With dead ends: 307 [2020-07-20 11:53:41,425 INFO L226 Difference]: Without dead ends: 226 [2020-07-20 11:53:41,427 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 386 GetRequests, 301 SyntacticMatches, 17 SemanticMatches, 68 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1208 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=1293, Invalid=3537, Unknown=0, NotChecked=0, Total=4830 [2020-07-20 11:53:41,427 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 226 states. [2020-07-20 11:53:41,435 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 226 to 158. [2020-07-20 11:53:41,436 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 158 states. [2020-07-20 11:53:41,437 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 158 states to 158 states and 169 transitions. [2020-07-20 11:53:41,437 INFO L78 Accepts]: Start accepts. Automaton has 158 states and 169 transitions. Word has length 185 [2020-07-20 11:53:41,437 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:53:41,437 INFO L479 AbstractCegarLoop]: Abstraction has 158 states and 169 transitions. [2020-07-20 11:53:41,438 INFO L480 AbstractCegarLoop]: Interpolant automaton has 53 states. [2020-07-20 11:53:41,438 INFO L276 IsEmpty]: Start isEmpty. Operand 158 states and 169 transitions. [2020-07-20 11:53:41,439 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 188 [2020-07-20 11:53:41,439 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:53:41,439 INFO L422 BasicCegarLoop]: trace histogram [18, 18, 18, 18, 17, 17, 17, 17, 17, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:53:41,653 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:53:41,654 INFO L427 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:53:41,654 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:53:41,655 INFO L82 PathProgramCache]: Analyzing trace with hash -1861014763, now seen corresponding path program 25 times [2020-07-20 11:53:41,655 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:53:41,655 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [112152183] [2020-07-20 11:53:41,655 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 29 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 29 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:53:41,737 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:53:41,738 INFO L263 TraceCheckSpWp]: Trace formula consists of 502 conjuncts, 38 conjunts are in the unsatisfiable core [2020-07-20 11:53:41,741 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:53:42,446 INFO L134 CoverageAnalysis]: Checked inductivity of 1462 backedges. 612 proven. 306 refuted. 0 times theorem prover too weak. 544 trivial. 0 not checked. [2020-07-20 11:53:42,446 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:53:43,304 INFO L134 CoverageAnalysis]: Checked inductivity of 1462 backedges. 612 proven. 306 refuted. 0 times theorem prover too weak. 544 trivial. 0 not checked. [2020-07-20 11:53:43,305 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [112152183] [2020-07-20 11:53:43,305 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:53:43,305 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [38, 38] total 56 [2020-07-20 11:53:43,305 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [488465368] [2020-07-20 11:53:43,306 INFO L459 AbstractCegarLoop]: Interpolant automaton has 56 states [2020-07-20 11:53:43,306 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:53:43,306 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 56 interpolants. [2020-07-20 11:53:43,308 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=739, Invalid=2341, Unknown=0, NotChecked=0, Total=3080 [2020-07-20 11:53:43,308 INFO L87 Difference]: Start difference. First operand 158 states and 169 transitions. Second operand 56 states. [2020-07-20 11:53:44,380 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:53:44,380 INFO L93 Difference]: Finished difference Result 311 states and 376 transitions. [2020-07-20 11:53:44,381 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2020-07-20 11:53:44,381 INFO L78 Accepts]: Start accepts. Automaton has 56 states. Word has length 187 [2020-07-20 11:53:44,381 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:53:44,383 INFO L225 Difference]: With dead ends: 311 [2020-07-20 11:53:44,383 INFO L226 Difference]: Without dead ends: 232 [2020-07-20 11:53:44,386 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 391 GetRequests, 301 SyntacticMatches, 18 SemanticMatches, 72 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1360 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=1441, Invalid=3961, Unknown=0, NotChecked=0, Total=5402 [2020-07-20 11:53:44,386 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 232 states. [2020-07-20 11:53:44,405 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 232 to 160. [2020-07-20 11:53:44,405 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 160 states. [2020-07-20 11:53:44,406 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 160 states to 160 states and 171 transitions. [2020-07-20 11:53:44,406 INFO L78 Accepts]: Start accepts. Automaton has 160 states and 171 transitions. Word has length 187 [2020-07-20 11:53:44,406 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:53:44,406 INFO L479 AbstractCegarLoop]: Abstraction has 160 states and 171 transitions. [2020-07-20 11:53:44,407 INFO L480 AbstractCegarLoop]: Interpolant automaton has 56 states. [2020-07-20 11:53:44,407 INFO L276 IsEmpty]: Start isEmpty. Operand 160 states and 171 transitions. [2020-07-20 11:53:44,409 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 190 [2020-07-20 11:53:44,409 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:53:44,410 INFO L422 BasicCegarLoop]: trace histogram [19, 18, 18, 18, 18, 17, 17, 17, 17, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:53:44,616 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 29 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:53:44,617 INFO L427 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:53:44,617 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:53:44,618 INFO L82 PathProgramCache]: Analyzing trace with hash 927992954, now seen corresponding path program 26 times [2020-07-20 11:53:44,618 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:53:44,618 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1589941357] [2020-07-20 11:53:44,619 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 30 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 30 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:53:44,697 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:53:44,699 INFO L263 TraceCheckSpWp]: Trace formula consists of 512 conjuncts, 39 conjunts are in the unsatisfiable core [2020-07-20 11:53:44,703 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:53:44,914 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 11:53:44,994 INFO L134 CoverageAnalysis]: Checked inductivity of 1498 backedges. 376 proven. 578 refuted. 0 times theorem prover too weak. 544 trivial. 0 not checked. [2020-07-20 11:53:44,995 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:53:45,031 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:53:45,678 INFO L134 CoverageAnalysis]: Checked inductivity of 1498 backedges. 376 proven. 578 refuted. 0 times theorem prover too weak. 544 trivial. 0 not checked. [2020-07-20 11:53:45,678 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1589941357] [2020-07-20 11:53:45,679 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:53:45,679 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23] total 24 [2020-07-20 11:53:45,679 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [647550799] [2020-07-20 11:53:45,680 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-07-20 11:53:45,685 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:53:45,685 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-07-20 11:53:45,687 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=235, Invalid=317, Unknown=0, NotChecked=0, Total=552 [2020-07-20 11:53:45,687 INFO L87 Difference]: Start difference. First operand 160 states and 171 transitions. Second operand 24 states. [2020-07-20 11:53:45,927 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:53:45,927 INFO L93 Difference]: Finished difference Result 179 states and 192 transitions. [2020-07-20 11:53:45,928 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2020-07-20 11:53:45,928 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 189 [2020-07-20 11:53:45,929 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:53:45,930 INFO L225 Difference]: With dead ends: 179 [2020-07-20 11:53:45,931 INFO L226 Difference]: Without dead ends: 177 [2020-07-20 11:53:45,931 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 378 GetRequests, 319 SyntacticMatches, 36 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 449 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=239, Invalid=361, Unknown=0, NotChecked=0, Total=600 [2020-07-20 11:53:45,932 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 177 states. [2020-07-20 11:53:45,939 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 177 to 172. [2020-07-20 11:53:45,940 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 172 states. [2020-07-20 11:53:45,941 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 172 states to 172 states and 184 transitions. [2020-07-20 11:53:45,941 INFO L78 Accepts]: Start accepts. Automaton has 172 states and 184 transitions. Word has length 189 [2020-07-20 11:53:45,941 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:53:45,941 INFO L479 AbstractCegarLoop]: Abstraction has 172 states and 184 transitions. [2020-07-20 11:53:45,942 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-07-20 11:53:45,942 INFO L276 IsEmpty]: Start isEmpty. Operand 172 states and 184 transitions. [2020-07-20 11:53:45,943 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 206 [2020-07-20 11:53:45,943 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:53:45,943 INFO L422 BasicCegarLoop]: trace histogram [20, 20, 20, 19, 19, 19, 19, 19, 19, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:53:46,156 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 30 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:53:46,157 INFO L427 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:53:46,157 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:53:46,158 INFO L82 PathProgramCache]: Analyzing trace with hash 1753938524, now seen corresponding path program 27 times [2020-07-20 11:53:46,158 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:53:46,158 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1053428914] [2020-07-20 11:53:46,158 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 31 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 31 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:53:46,279 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:53:46,282 INFO L263 TraceCheckSpWp]: Trace formula consists of 546 conjuncts, 40 conjunts are in the unsatisfiable core [2020-07-20 11:53:46,294 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:53:47,218 INFO L134 CoverageAnalysis]: Checked inductivity of 1786 backedges. 828 proven. 342 refuted. 0 times theorem prover too weak. 616 trivial. 0 not checked. [2020-07-20 11:53:47,218 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:53:48,172 INFO L134 CoverageAnalysis]: Checked inductivity of 1786 backedges. 758 proven. 342 refuted. 0 times theorem prover too weak. 686 trivial. 0 not checked. [2020-07-20 11:53:48,172 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1053428914] [2020-07-20 11:53:48,172 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:53:48,172 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [40, 40] total 59 [2020-07-20 11:53:48,173 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1702616368] [2020-07-20 11:53:48,173 INFO L459 AbstractCegarLoop]: Interpolant automaton has 59 states [2020-07-20 11:53:48,173 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:53:48,173 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 59 interpolants. [2020-07-20 11:53:48,174 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=818, Invalid=2604, Unknown=0, NotChecked=0, Total=3422 [2020-07-20 11:53:48,174 INFO L87 Difference]: Start difference. First operand 172 states and 184 transitions. Second operand 59 states. [2020-07-20 11:53:49,350 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:53:49,350 INFO L93 Difference]: Finished difference Result 339 states and 408 transitions. [2020-07-20 11:53:49,350 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2020-07-20 11:53:49,350 INFO L78 Accepts]: Start accepts. Automaton has 59 states. Word has length 205 [2020-07-20 11:53:49,351 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:53:49,355 INFO L225 Difference]: With dead ends: 339 [2020-07-20 11:53:49,355 INFO L226 Difference]: Without dead ends: 250 [2020-07-20 11:53:49,357 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 428 GetRequests, 333 SyntacticMatches, 19 SemanticMatches, 76 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1521 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=1597, Invalid=4409, Unknown=0, NotChecked=0, Total=6006 [2020-07-20 11:53:49,358 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 250 states. [2020-07-20 11:53:49,369 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 250 to 174. [2020-07-20 11:53:49,369 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 174 states. [2020-07-20 11:53:49,370 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 174 states to 174 states and 186 transitions. [2020-07-20 11:53:49,371 INFO L78 Accepts]: Start accepts. Automaton has 174 states and 186 transitions. Word has length 205 [2020-07-20 11:53:49,371 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:53:49,371 INFO L479 AbstractCegarLoop]: Abstraction has 174 states and 186 transitions. [2020-07-20 11:53:49,372 INFO L480 AbstractCegarLoop]: Interpolant automaton has 59 states. [2020-07-20 11:53:49,372 INFO L276 IsEmpty]: Start isEmpty. Operand 174 states and 186 transitions. [2020-07-20 11:53:49,373 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 208 [2020-07-20 11:53:49,373 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:53:49,373 INFO L422 BasicCegarLoop]: trace histogram [20, 20, 20, 20, 19, 19, 19, 19, 19, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:53:49,586 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 31 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:53:49,587 INFO L427 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:53:49,587 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:53:49,588 INFO L82 PathProgramCache]: Analyzing trace with hash 1542073473, now seen corresponding path program 28 times [2020-07-20 11:53:49,588 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:53:49,588 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1558019996] [2020-07-20 11:53:49,588 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 32 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 32 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:53:49,672 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:53:49,674 INFO L263 TraceCheckSpWp]: Trace formula consists of 556 conjuncts, 42 conjunts are in the unsatisfiable core [2020-07-20 11:53:49,679 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:53:50,608 INFO L134 CoverageAnalysis]: Checked inductivity of 1824 backedges. 760 proven. 380 refuted. 0 times theorem prover too weak. 684 trivial. 0 not checked. [2020-07-20 11:53:50,608 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:53:51,759 INFO L134 CoverageAnalysis]: Checked inductivity of 1824 backedges. 760 proven. 380 refuted. 0 times theorem prover too weak. 684 trivial. 0 not checked. [2020-07-20 11:53:51,760 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1558019996] [2020-07-20 11:53:51,760 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:53:51,760 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [42, 42] total 62 [2020-07-20 11:53:51,760 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [136287923] [2020-07-20 11:53:51,761 INFO L459 AbstractCegarLoop]: Interpolant automaton has 62 states [2020-07-20 11:53:51,761 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:53:51,762 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 62 interpolants. [2020-07-20 11:53:51,762 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=901, Invalid=2881, Unknown=0, NotChecked=0, Total=3782 [2020-07-20 11:53:51,762 INFO L87 Difference]: Start difference. First operand 174 states and 186 transitions. Second operand 62 states. [2020-07-20 11:53:53,075 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:53:53,076 INFO L93 Difference]: Finished difference Result 343 states and 415 transitions. [2020-07-20 11:53:53,076 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2020-07-20 11:53:53,076 INFO L78 Accepts]: Start accepts. Automaton has 62 states. Word has length 207 [2020-07-20 11:53:53,076 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:53:53,078 INFO L225 Difference]: With dead ends: 343 [2020-07-20 11:53:53,078 INFO L226 Difference]: Without dead ends: 256 [2020-07-20 11:53:53,079 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 433 GetRequests, 333 SyntacticMatches, 20 SemanticMatches, 80 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1691 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=1761, Invalid=4881, Unknown=0, NotChecked=0, Total=6642 [2020-07-20 11:53:53,079 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 256 states. [2020-07-20 11:53:53,089 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 256 to 176. [2020-07-20 11:53:53,089 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 176 states. [2020-07-20 11:53:53,090 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 176 states to 176 states and 188 transitions. [2020-07-20 11:53:53,090 INFO L78 Accepts]: Start accepts. Automaton has 176 states and 188 transitions. Word has length 207 [2020-07-20 11:53:53,091 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:53:53,091 INFO L479 AbstractCegarLoop]: Abstraction has 176 states and 188 transitions. [2020-07-20 11:53:53,091 INFO L480 AbstractCegarLoop]: Interpolant automaton has 62 states. [2020-07-20 11:53:53,091 INFO L276 IsEmpty]: Start isEmpty. Operand 176 states and 188 transitions. [2020-07-20 11:53:53,092 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 210 [2020-07-20 11:53:53,092 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:53:53,092 INFO L422 BasicCegarLoop]: trace histogram [21, 20, 20, 20, 20, 19, 19, 19, 19, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:53:53,307 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 32 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:53:53,308 INFO L427 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:53:53,308 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:53:53,308 INFO L82 PathProgramCache]: Analyzing trace with hash -196777626, now seen corresponding path program 29 times [2020-07-20 11:53:53,309 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:53:53,309 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [292806777] [2020-07-20 11:53:53,309 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 33 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 33 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:53:53,394 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:53:53,396 INFO L263 TraceCheckSpWp]: Trace formula consists of 566 conjuncts, 43 conjunts are in the unsatisfiable core [2020-07-20 11:53:53,401 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:53:53,690 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 11:53:53,744 INFO L134 CoverageAnalysis]: Checked inductivity of 1864 backedges. 458 proven. 722 refuted. 0 times theorem prover too weak. 684 trivial. 0 not checked. [2020-07-20 11:53:53,744 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:53:53,773 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:53:54,351 INFO L134 CoverageAnalysis]: Checked inductivity of 1864 backedges. 458 proven. 722 refuted. 0 times theorem prover too weak. 684 trivial. 0 not checked. [2020-07-20 11:53:54,352 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [292806777] [2020-07-20 11:53:54,352 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:53:54,352 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25] total 26 [2020-07-20 11:53:54,352 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1986609074] [2020-07-20 11:53:54,353 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2020-07-20 11:53:54,353 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:53:54,353 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2020-07-20 11:53:54,353 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=280, Invalid=370, Unknown=0, NotChecked=0, Total=650 [2020-07-20 11:53:54,354 INFO L87 Difference]: Start difference. First operand 176 states and 188 transitions. Second operand 26 states. [2020-07-20 11:53:54,632 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:53:54,632 INFO L93 Difference]: Finished difference Result 195 states and 209 transitions. [2020-07-20 11:53:54,632 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2020-07-20 11:53:54,633 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 209 [2020-07-20 11:53:54,634 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:53:54,635 INFO L225 Difference]: With dead ends: 195 [2020-07-20 11:53:54,635 INFO L226 Difference]: Without dead ends: 193 [2020-07-20 11:53:54,636 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 418 GetRequests, 353 SyntacticMatches, 40 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 539 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=284, Invalid=418, Unknown=0, NotChecked=0, Total=702 [2020-07-20 11:53:54,637 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 193 states. [2020-07-20 11:53:54,645 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 193 to 188. [2020-07-20 11:53:54,645 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 188 states. [2020-07-20 11:53:54,646 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 188 states to 188 states and 201 transitions. [2020-07-20 11:53:54,646 INFO L78 Accepts]: Start accepts. Automaton has 188 states and 201 transitions. Word has length 209 [2020-07-20 11:53:54,647 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:53:54,647 INFO L479 AbstractCegarLoop]: Abstraction has 188 states and 201 transitions. [2020-07-20 11:53:54,647 INFO L480 AbstractCegarLoop]: Interpolant automaton has 26 states. [2020-07-20 11:53:54,647 INFO L276 IsEmpty]: Start isEmpty. Operand 188 states and 201 transitions. [2020-07-20 11:53:54,648 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 226 [2020-07-20 11:53:54,649 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:53:54,649 INFO L422 BasicCegarLoop]: trace histogram [22, 22, 22, 21, 21, 21, 21, 21, 21, 20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:53:54,863 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 33 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:53:54,864 INFO L427 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:53:54,864 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:53:54,864 INFO L82 PathProgramCache]: Analyzing trace with hash 65077064, now seen corresponding path program 30 times [2020-07-20 11:53:54,864 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:53:54,864 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1439987809] [2020-07-20 11:53:54,864 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 34 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 34 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:53:54,953 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:53:54,954 INFO L263 TraceCheckSpWp]: Trace formula consists of 600 conjuncts, 44 conjunts are in the unsatisfiable core [2020-07-20 11:53:54,958 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:53:55,904 INFO L134 CoverageAnalysis]: Checked inductivity of 2184 backedges. 1000 proven. 420 refuted. 0 times theorem prover too weak. 764 trivial. 0 not checked. [2020-07-20 11:53:55,904 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:53:57,024 INFO L134 CoverageAnalysis]: Checked inductivity of 2184 backedges. 922 proven. 420 refuted. 0 times theorem prover too weak. 842 trivial. 0 not checked. [2020-07-20 11:53:57,024 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1439987809] [2020-07-20 11:53:57,024 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:53:57,025 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [44, 44] total 65 [2020-07-20 11:53:57,025 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [6127881] [2020-07-20 11:53:57,025 INFO L459 AbstractCegarLoop]: Interpolant automaton has 65 states [2020-07-20 11:53:57,025 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:53:57,026 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 65 interpolants. [2020-07-20 11:53:57,027 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=988, Invalid=3172, Unknown=0, NotChecked=0, Total=4160 [2020-07-20 11:53:57,027 INFO L87 Difference]: Start difference. First operand 188 states and 201 transitions. Second operand 65 states. [2020-07-20 11:53:58,408 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:53:58,409 INFO L93 Difference]: Finished difference Result 371 states and 447 transitions. [2020-07-20 11:53:58,409 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2020-07-20 11:53:58,409 INFO L78 Accepts]: Start accepts. Automaton has 65 states. Word has length 225 [2020-07-20 11:53:58,410 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:53:58,411 INFO L225 Difference]: With dead ends: 371 [2020-07-20 11:53:58,412 INFO L226 Difference]: Without dead ends: 274 [2020-07-20 11:53:58,413 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 470 GetRequests, 365 SyntacticMatches, 21 SemanticMatches, 84 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1870 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=1933, Invalid=5377, Unknown=0, NotChecked=0, Total=7310 [2020-07-20 11:53:58,414 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 274 states. [2020-07-20 11:53:58,422 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 274 to 190. [2020-07-20 11:53:58,422 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 190 states. [2020-07-20 11:53:58,423 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 190 states to 190 states and 203 transitions. [2020-07-20 11:53:58,423 INFO L78 Accepts]: Start accepts. Automaton has 190 states and 203 transitions. Word has length 225 [2020-07-20 11:53:58,423 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:53:58,423 INFO L479 AbstractCegarLoop]: Abstraction has 190 states and 203 transitions. [2020-07-20 11:53:58,424 INFO L480 AbstractCegarLoop]: Interpolant automaton has 65 states. [2020-07-20 11:53:58,424 INFO L276 IsEmpty]: Start isEmpty. Operand 190 states and 203 transitions. [2020-07-20 11:53:58,425 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 228 [2020-07-20 11:53:58,425 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:53:58,425 INFO L422 BasicCegarLoop]: trace histogram [22, 22, 22, 22, 21, 21, 21, 21, 21, 21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:53:58,639 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 34 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:53:58,640 INFO L427 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:53:58,640 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:53:58,641 INFO L82 PathProgramCache]: Analyzing trace with hash 1137618157, now seen corresponding path program 31 times [2020-07-20 11:53:58,641 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:53:58,641 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1610282261] [2020-07-20 11:53:58,641 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 35 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 35 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:53:58,734 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:53:58,736 INFO L263 TraceCheckSpWp]: Trace formula consists of 610 conjuncts, 46 conjunts are in the unsatisfiable core [2020-07-20 11:53:58,739 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:53:59,802 INFO L134 CoverageAnalysis]: Checked inductivity of 2226 backedges. 924 proven. 462 refuted. 0 times theorem prover too weak. 840 trivial. 0 not checked. [2020-07-20 11:53:59,802 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:54:01,041 INFO L134 CoverageAnalysis]: Checked inductivity of 2226 backedges. 924 proven. 462 refuted. 0 times theorem prover too weak. 840 trivial. 0 not checked. [2020-07-20 11:54:01,041 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1610282261] [2020-07-20 11:54:01,041 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:54:01,041 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [46, 46] total 68 [2020-07-20 11:54:01,041 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1751804203] [2020-07-20 11:54:01,042 INFO L459 AbstractCegarLoop]: Interpolant automaton has 68 states [2020-07-20 11:54:01,042 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:54:01,043 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 68 interpolants. [2020-07-20 11:54:01,043 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1079, Invalid=3477, Unknown=0, NotChecked=0, Total=4556 [2020-07-20 11:54:01,043 INFO L87 Difference]: Start difference. First operand 190 states and 203 transitions. Second operand 68 states. [2020-07-20 11:54:02,543 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:54:02,544 INFO L93 Difference]: Finished difference Result 375 states and 454 transitions. [2020-07-20 11:54:02,544 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2020-07-20 11:54:02,544 INFO L78 Accepts]: Start accepts. Automaton has 68 states. Word has length 227 [2020-07-20 11:54:02,545 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:54:02,547 INFO L225 Difference]: With dead ends: 375 [2020-07-20 11:54:02,547 INFO L226 Difference]: Without dead ends: 280 [2020-07-20 11:54:02,548 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 475 GetRequests, 365 SyntacticMatches, 22 SemanticMatches, 88 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2058 ImplicationChecksByTransitivity, 2.7s TimeCoverageRelationStatistics Valid=2113, Invalid=5897, Unknown=0, NotChecked=0, Total=8010 [2020-07-20 11:54:02,549 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 280 states. [2020-07-20 11:54:02,557 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 280 to 192. [2020-07-20 11:54:02,557 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 192 states. [2020-07-20 11:54:02,558 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 192 states to 192 states and 205 transitions. [2020-07-20 11:54:02,559 INFO L78 Accepts]: Start accepts. Automaton has 192 states and 205 transitions. Word has length 227 [2020-07-20 11:54:02,559 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:54:02,559 INFO L479 AbstractCegarLoop]: Abstraction has 192 states and 205 transitions. [2020-07-20 11:54:02,559 INFO L480 AbstractCegarLoop]: Interpolant automaton has 68 states. [2020-07-20 11:54:02,559 INFO L276 IsEmpty]: Start isEmpty. Operand 192 states and 205 transitions. [2020-07-20 11:54:02,560 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 230 [2020-07-20 11:54:02,560 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:54:02,561 INFO L422 BasicCegarLoop]: trace histogram [23, 22, 22, 22, 22, 21, 21, 21, 21, 21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:54:02,774 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 35 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:54:02,775 INFO L427 AbstractCegarLoop]: === Iteration 35 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:54:02,775 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:54:02,775 INFO L82 PathProgramCache]: Analyzing trace with hash 1057457490, now seen corresponding path program 32 times [2020-07-20 11:54:02,775 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:54:02,776 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2142969841] [2020-07-20 11:54:02,776 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 36 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 36 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:54:02,867 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:54:02,869 INFO L263 TraceCheckSpWp]: Trace formula consists of 620 conjuncts, 47 conjunts are in the unsatisfiable core [2020-07-20 11:54:02,873 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:54:03,219 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 11:54:03,284 INFO L134 CoverageAnalysis]: Checked inductivity of 2270 backedges. 548 proven. 882 refuted. 0 times theorem prover too weak. 840 trivial. 0 not checked. [2020-07-20 11:54:03,284 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:54:03,316 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:54:04,006 INFO L134 CoverageAnalysis]: Checked inductivity of 2270 backedges. 548 proven. 882 refuted. 0 times theorem prover too weak. 840 trivial. 0 not checked. [2020-07-20 11:54:04,007 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2142969841] [2020-07-20 11:54:04,007 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:54:04,007 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 27] total 28 [2020-07-20 11:54:04,008 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [428145645] [2020-07-20 11:54:04,008 INFO L459 AbstractCegarLoop]: Interpolant automaton has 28 states [2020-07-20 11:54:04,008 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:54:04,008 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2020-07-20 11:54:04,009 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=329, Invalid=427, Unknown=0, NotChecked=0, Total=756 [2020-07-20 11:54:04,009 INFO L87 Difference]: Start difference. First operand 192 states and 205 transitions. Second operand 28 states. [2020-07-20 11:54:04,281 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:54:04,281 INFO L93 Difference]: Finished difference Result 211 states and 226 transitions. [2020-07-20 11:54:04,282 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2020-07-20 11:54:04,282 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 229 [2020-07-20 11:54:04,283 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:54:04,284 INFO L225 Difference]: With dead ends: 211 [2020-07-20 11:54:04,284 INFO L226 Difference]: Without dead ends: 209 [2020-07-20 11:54:04,285 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 458 GetRequests, 387 SyntacticMatches, 44 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 637 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=333, Invalid=479, Unknown=0, NotChecked=0, Total=812 [2020-07-20 11:54:04,285 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 209 states. [2020-07-20 11:54:04,293 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 209 to 204. [2020-07-20 11:54:04,294 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 204 states. [2020-07-20 11:54:04,294 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 204 states to 204 states and 218 transitions. [2020-07-20 11:54:04,295 INFO L78 Accepts]: Start accepts. Automaton has 204 states and 218 transitions. Word has length 229 [2020-07-20 11:54:04,295 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:54:04,295 INFO L479 AbstractCegarLoop]: Abstraction has 204 states and 218 transitions. [2020-07-20 11:54:04,295 INFO L480 AbstractCegarLoop]: Interpolant automaton has 28 states. [2020-07-20 11:54:04,295 INFO L276 IsEmpty]: Start isEmpty. Operand 204 states and 218 transitions. [2020-07-20 11:54:04,297 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 246 [2020-07-20 11:54:04,297 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:54:04,297 INFO L422 BasicCegarLoop]: trace histogram [24, 24, 24, 23, 23, 23, 23, 23, 23, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:54:04,510 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 36 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:54:04,511 INFO L427 AbstractCegarLoop]: === Iteration 36 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:54:04,511 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:54:04,512 INFO L82 PathProgramCache]: Analyzing trace with hash -777665740, now seen corresponding path program 33 times [2020-07-20 11:54:04,512 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:54:04,512 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1393633241] [2020-07-20 11:54:04,512 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 37 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 37 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:54:04,616 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:54:04,619 INFO L263 TraceCheckSpWp]: Trace formula consists of 654 conjuncts, 48 conjunts are in the unsatisfiable core [2020-07-20 11:54:04,623 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:54:05,756 INFO L134 CoverageAnalysis]: Checked inductivity of 2622 backedges. 1188 proven. 506 refuted. 0 times theorem prover too weak. 928 trivial. 0 not checked. [2020-07-20 11:54:05,756 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:54:07,121 INFO L134 CoverageAnalysis]: Checked inductivity of 2622 backedges. 1102 proven. 506 refuted. 0 times theorem prover too weak. 1014 trivial. 0 not checked. [2020-07-20 11:54:07,121 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1393633241] [2020-07-20 11:54:07,122 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:54:07,122 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [48, 48] total 71 [2020-07-20 11:54:07,122 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [952893059] [2020-07-20 11:54:07,122 INFO L459 AbstractCegarLoop]: Interpolant automaton has 71 states [2020-07-20 11:54:07,122 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:54:07,123 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 71 interpolants. [2020-07-20 11:54:07,124 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1174, Invalid=3796, Unknown=0, NotChecked=0, Total=4970 [2020-07-20 11:54:07,124 INFO L87 Difference]: Start difference. First operand 204 states and 218 transitions. Second operand 71 states. [2020-07-20 11:54:08,718 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:54:08,719 INFO L93 Difference]: Finished difference Result 403 states and 486 transitions. [2020-07-20 11:54:08,719 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2020-07-20 11:54:08,719 INFO L78 Accepts]: Start accepts. Automaton has 71 states. Word has length 245 [2020-07-20 11:54:08,720 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:54:08,722 INFO L225 Difference]: With dead ends: 403 [2020-07-20 11:54:08,722 INFO L226 Difference]: Without dead ends: 298 [2020-07-20 11:54:08,724 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 512 GetRequests, 397 SyntacticMatches, 23 SemanticMatches, 92 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2255 ImplicationChecksByTransitivity, 2.9s TimeCoverageRelationStatistics Valid=2301, Invalid=6441, Unknown=0, NotChecked=0, Total=8742 [2020-07-20 11:54:08,725 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 298 states. [2020-07-20 11:54:08,736 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 298 to 206. [2020-07-20 11:54:08,736 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 206 states. [2020-07-20 11:54:08,737 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 206 states to 206 states and 220 transitions. [2020-07-20 11:54:08,737 INFO L78 Accepts]: Start accepts. Automaton has 206 states and 220 transitions. Word has length 245 [2020-07-20 11:54:08,737 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:54:08,738 INFO L479 AbstractCegarLoop]: Abstraction has 206 states and 220 transitions. [2020-07-20 11:54:08,738 INFO L480 AbstractCegarLoop]: Interpolant automaton has 71 states. [2020-07-20 11:54:08,738 INFO L276 IsEmpty]: Start isEmpty. Operand 206 states and 220 transitions. [2020-07-20 11:54:08,740 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 248 [2020-07-20 11:54:08,740 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:54:08,740 INFO L422 BasicCegarLoop]: trace histogram [24, 24, 24, 24, 23, 23, 23, 23, 23, 23, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:54:08,954 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 37 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:54:08,955 INFO L427 AbstractCegarLoop]: === Iteration 37 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:54:08,955 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:54:08,956 INFO L82 PathProgramCache]: Analyzing trace with hash 1435577433, now seen corresponding path program 34 times [2020-07-20 11:54:08,956 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:54:08,956 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1094204493] [2020-07-20 11:54:08,956 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 38 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 38 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:54:09,047 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:54:09,049 INFO L263 TraceCheckSpWp]: Trace formula consists of 664 conjuncts, 50 conjunts are in the unsatisfiable core [2020-07-20 11:54:09,052 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:54:10,320 INFO L134 CoverageAnalysis]: Checked inductivity of 2668 backedges. 1104 proven. 552 refuted. 0 times theorem prover too weak. 1012 trivial. 0 not checked. [2020-07-20 11:54:10,320 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:54:11,814 INFO L134 CoverageAnalysis]: Checked inductivity of 2668 backedges. 1104 proven. 552 refuted. 0 times theorem prover too weak. 1012 trivial. 0 not checked. [2020-07-20 11:54:11,814 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1094204493] [2020-07-20 11:54:11,814 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:54:11,815 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [50, 50] total 74 [2020-07-20 11:54:11,815 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2145989896] [2020-07-20 11:54:11,815 INFO L459 AbstractCegarLoop]: Interpolant automaton has 74 states [2020-07-20 11:54:11,815 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:54:11,816 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 74 interpolants. [2020-07-20 11:54:11,816 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1273, Invalid=4129, Unknown=0, NotChecked=0, Total=5402 [2020-07-20 11:54:11,816 INFO L87 Difference]: Start difference. First operand 206 states and 220 transitions. Second operand 74 states. [2020-07-20 11:54:13,615 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:54:13,615 INFO L93 Difference]: Finished difference Result 407 states and 493 transitions. [2020-07-20 11:54:13,615 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2020-07-20 11:54:13,615 INFO L78 Accepts]: Start accepts. Automaton has 74 states. Word has length 247 [2020-07-20 11:54:13,616 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:54:13,617 INFO L225 Difference]: With dead ends: 407 [2020-07-20 11:54:13,617 INFO L226 Difference]: Without dead ends: 304 [2020-07-20 11:54:13,618 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 517 GetRequests, 397 SyntacticMatches, 24 SemanticMatches, 96 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2461 ImplicationChecksByTransitivity, 3.2s TimeCoverageRelationStatistics Valid=2497, Invalid=7009, Unknown=0, NotChecked=0, Total=9506 [2020-07-20 11:54:13,619 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 304 states. [2020-07-20 11:54:13,627 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 304 to 208. [2020-07-20 11:54:13,627 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 208 states. [2020-07-20 11:54:13,628 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 208 states to 208 states and 222 transitions. [2020-07-20 11:54:13,628 INFO L78 Accepts]: Start accepts. Automaton has 208 states and 222 transitions. Word has length 247 [2020-07-20 11:54:13,629 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:54:13,629 INFO L479 AbstractCegarLoop]: Abstraction has 208 states and 222 transitions. [2020-07-20 11:54:13,629 INFO L480 AbstractCegarLoop]: Interpolant automaton has 74 states. [2020-07-20 11:54:13,629 INFO L276 IsEmpty]: Start isEmpty. Operand 208 states and 222 transitions. [2020-07-20 11:54:13,630 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 250 [2020-07-20 11:54:13,630 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:54:13,631 INFO L422 BasicCegarLoop]: trace histogram [25, 24, 24, 24, 24, 23, 23, 23, 23, 23, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:54:13,843 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 38 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:54:13,844 INFO L427 AbstractCegarLoop]: === Iteration 38 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:54:13,844 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:54:13,844 INFO L82 PathProgramCache]: Analyzing trace with hash -1941512130, now seen corresponding path program 35 times [2020-07-20 11:54:13,845 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:54:13,845 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [483166544] [2020-07-20 11:54:13,845 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 39 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 39 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:54:13,945 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:54:13,947 INFO L263 TraceCheckSpWp]: Trace formula consists of 674 conjuncts, 51 conjunts are in the unsatisfiable core [2020-07-20 11:54:13,950 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:54:14,379 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 11:54:14,446 INFO L134 CoverageAnalysis]: Checked inductivity of 2716 backedges. 646 proven. 1058 refuted. 0 times theorem prover too weak. 1012 trivial. 0 not checked. [2020-07-20 11:54:14,446 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:54:14,481 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:54:15,316 INFO L134 CoverageAnalysis]: Checked inductivity of 2716 backedges. 646 proven. 1058 refuted. 0 times theorem prover too weak. 1012 trivial. 0 not checked. [2020-07-20 11:54:15,316 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [483166544] [2020-07-20 11:54:15,316 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:54:15,316 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 29] total 30 [2020-07-20 11:54:15,317 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [378905717] [2020-07-20 11:54:15,317 INFO L459 AbstractCegarLoop]: Interpolant automaton has 30 states [2020-07-20 11:54:15,317 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:54:15,318 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2020-07-20 11:54:15,318 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=382, Invalid=488, Unknown=0, NotChecked=0, Total=870 [2020-07-20 11:54:15,318 INFO L87 Difference]: Start difference. First operand 208 states and 222 transitions. Second operand 30 states. [2020-07-20 11:54:15,628 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:54:15,628 INFO L93 Difference]: Finished difference Result 227 states and 243 transitions. [2020-07-20 11:54:15,629 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2020-07-20 11:54:15,629 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 249 [2020-07-20 11:54:15,630 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:54:15,631 INFO L225 Difference]: With dead ends: 227 [2020-07-20 11:54:15,631 INFO L226 Difference]: Without dead ends: 225 [2020-07-20 11:54:15,632 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 498 GetRequests, 421 SyntacticMatches, 48 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 743 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=386, Invalid=544, Unknown=0, NotChecked=0, Total=930 [2020-07-20 11:54:15,632 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 225 states. [2020-07-20 11:54:15,641 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 225 to 220. [2020-07-20 11:54:15,641 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 220 states. [2020-07-20 11:54:15,642 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 220 states to 220 states and 235 transitions. [2020-07-20 11:54:15,642 INFO L78 Accepts]: Start accepts. Automaton has 220 states and 235 transitions. Word has length 249 [2020-07-20 11:54:15,643 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:54:15,643 INFO L479 AbstractCegarLoop]: Abstraction has 220 states and 235 transitions. [2020-07-20 11:54:15,643 INFO L480 AbstractCegarLoop]: Interpolant automaton has 30 states. [2020-07-20 11:54:15,643 INFO L276 IsEmpty]: Start isEmpty. Operand 220 states and 235 transitions. [2020-07-20 11:54:15,644 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 266 [2020-07-20 11:54:15,645 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:54:15,645 INFO L422 BasicCegarLoop]: trace histogram [26, 26, 26, 25, 25, 25, 25, 25, 25, 24, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:54:15,857 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 39 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:54:15,858 INFO L427 AbstractCegarLoop]: === Iteration 39 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:54:15,858 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:54:15,859 INFO L82 PathProgramCache]: Analyzing trace with hash -712391136, now seen corresponding path program 36 times [2020-07-20 11:54:15,859 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:54:15,859 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1198192912] [2020-07-20 11:54:15,859 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 40 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 40 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:54:15,962 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:54:15,964 INFO L263 TraceCheckSpWp]: Trace formula consists of 708 conjuncts, 52 conjunts are in the unsatisfiable core [2020-07-20 11:54:15,967 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:54:17,369 INFO L134 CoverageAnalysis]: Checked inductivity of 3100 backedges. 1392 proven. 600 refuted. 0 times theorem prover too weak. 1108 trivial. 0 not checked. [2020-07-20 11:54:17,370 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:54:19,002 INFO L134 CoverageAnalysis]: Checked inductivity of 3100 backedges. 1298 proven. 600 refuted. 0 times theorem prover too weak. 1202 trivial. 0 not checked. [2020-07-20 11:54:19,002 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1198192912] [2020-07-20 11:54:19,003 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:54:19,003 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [52, 52] total 77 [2020-07-20 11:54:19,003 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [378949542] [2020-07-20 11:54:19,004 INFO L459 AbstractCegarLoop]: Interpolant automaton has 77 states [2020-07-20 11:54:19,004 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:54:19,004 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 77 interpolants. [2020-07-20 11:54:19,005 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1376, Invalid=4476, Unknown=0, NotChecked=0, Total=5852 [2020-07-20 11:54:19,005 INFO L87 Difference]: Start difference. First operand 220 states and 235 transitions. Second operand 77 states. [2020-07-20 11:54:20,916 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:54:20,916 INFO L93 Difference]: Finished difference Result 435 states and 525 transitions. [2020-07-20 11:54:20,917 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 52 states. [2020-07-20 11:54:20,917 INFO L78 Accepts]: Start accepts. Automaton has 77 states. Word has length 265 [2020-07-20 11:54:20,917 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:54:20,918 INFO L225 Difference]: With dead ends: 435 [2020-07-20 11:54:20,919 INFO L226 Difference]: Without dead ends: 322 [2020-07-20 11:54:20,920 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 554 GetRequests, 429 SyntacticMatches, 25 SemanticMatches, 100 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2676 ImplicationChecksByTransitivity, 3.5s TimeCoverageRelationStatistics Valid=2701, Invalid=7601, Unknown=0, NotChecked=0, Total=10302 [2020-07-20 11:54:20,920 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 322 states. [2020-07-20 11:54:20,930 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 322 to 222. [2020-07-20 11:54:20,930 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 222 states. [2020-07-20 11:54:20,931 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 222 states to 222 states and 237 transitions. [2020-07-20 11:54:20,931 INFO L78 Accepts]: Start accepts. Automaton has 222 states and 237 transitions. Word has length 265 [2020-07-20 11:54:20,931 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:54:20,931 INFO L479 AbstractCegarLoop]: Abstraction has 222 states and 237 transitions. [2020-07-20 11:54:20,932 INFO L480 AbstractCegarLoop]: Interpolant automaton has 77 states. [2020-07-20 11:54:20,932 INFO L276 IsEmpty]: Start isEmpty. Operand 222 states and 237 transitions. [2020-07-20 11:54:20,933 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 268 [2020-07-20 11:54:20,933 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:54:20,933 INFO L422 BasicCegarLoop]: trace histogram [26, 26, 26, 26, 25, 25, 25, 25, 25, 25, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:54:21,148 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 40 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:54:21,149 INFO L427 AbstractCegarLoop]: === Iteration 40 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:54:21,149 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:54:21,149 INFO L82 PathProgramCache]: Analyzing trace with hash -993908027, now seen corresponding path program 37 times [2020-07-20 11:54:21,149 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:54:21,149 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1807270172] [2020-07-20 11:54:21,150 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 41 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 41 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:54:21,260 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:54:21,264 INFO L263 TraceCheckSpWp]: Trace formula consists of 718 conjuncts, 54 conjunts are in the unsatisfiable core [2020-07-20 11:54:21,269 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:54:22,756 INFO L134 CoverageAnalysis]: Checked inductivity of 3150 backedges. 1300 proven. 650 refuted. 0 times theorem prover too weak. 1200 trivial. 0 not checked. [2020-07-20 11:54:22,756 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:54:24,520 INFO L134 CoverageAnalysis]: Checked inductivity of 3150 backedges. 1300 proven. 650 refuted. 0 times theorem prover too weak. 1200 trivial. 0 not checked. [2020-07-20 11:54:24,521 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1807270172] [2020-07-20 11:54:24,521 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:54:24,521 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [54, 54] total 80 [2020-07-20 11:54:24,522 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1665636683] [2020-07-20 11:54:24,522 INFO L459 AbstractCegarLoop]: Interpolant automaton has 80 states [2020-07-20 11:54:24,522 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:54:24,522 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 80 interpolants. [2020-07-20 11:54:24,523 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1483, Invalid=4837, Unknown=0, NotChecked=0, Total=6320 [2020-07-20 11:54:24,523 INFO L87 Difference]: Start difference. First operand 222 states and 237 transitions. Second operand 80 states. [2020-07-20 11:54:26,556 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:54:26,557 INFO L93 Difference]: Finished difference Result 439 states and 532 transitions. [2020-07-20 11:54:26,557 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 54 states. [2020-07-20 11:54:26,557 INFO L78 Accepts]: Start accepts. Automaton has 80 states. Word has length 267 [2020-07-20 11:54:26,557 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:54:26,559 INFO L225 Difference]: With dead ends: 439 [2020-07-20 11:54:26,559 INFO L226 Difference]: Without dead ends: 328 [2020-07-20 11:54:26,560 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 559 GetRequests, 429 SyntacticMatches, 26 SemanticMatches, 104 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2900 ImplicationChecksByTransitivity, 3.8s TimeCoverageRelationStatistics Valid=2913, Invalid=8217, Unknown=0, NotChecked=0, Total=11130 [2020-07-20 11:54:26,561 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 328 states. [2020-07-20 11:54:26,570 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 328 to 224. [2020-07-20 11:54:26,570 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 224 states. [2020-07-20 11:54:26,571 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 224 states to 224 states and 239 transitions. [2020-07-20 11:54:26,571 INFO L78 Accepts]: Start accepts. Automaton has 224 states and 239 transitions. Word has length 267 [2020-07-20 11:54:26,571 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:54:26,571 INFO L479 AbstractCegarLoop]: Abstraction has 224 states and 239 transitions. [2020-07-20 11:54:26,572 INFO L480 AbstractCegarLoop]: Interpolant automaton has 80 states. [2020-07-20 11:54:26,572 INFO L276 IsEmpty]: Start isEmpty. Operand 224 states and 239 transitions. [2020-07-20 11:54:26,573 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 270 [2020-07-20 11:54:26,573 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:54:26,574 INFO L422 BasicCegarLoop]: trace histogram [27, 26, 26, 26, 26, 25, 25, 25, 25, 25, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:54:26,786 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 41 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:54:26,787 INFO L427 AbstractCegarLoop]: === Iteration 41 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:54:26,787 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:54:26,788 INFO L82 PathProgramCache]: Analyzing trace with hash -948700630, now seen corresponding path program 38 times [2020-07-20 11:54:26,788 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:54:26,788 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [584749783] [2020-07-20 11:54:26,788 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 42 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 42 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:54:26,893 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:54:26,896 INFO L263 TraceCheckSpWp]: Trace formula consists of 728 conjuncts, 55 conjunts are in the unsatisfiable core [2020-07-20 11:54:26,901 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:54:27,406 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 11:54:27,493 INFO L134 CoverageAnalysis]: Checked inductivity of 3202 backedges. 752 proven. 1250 refuted. 0 times theorem prover too weak. 1200 trivial. 0 not checked. [2020-07-20 11:54:27,493 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:54:27,532 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:54:28,513 INFO L134 CoverageAnalysis]: Checked inductivity of 3202 backedges. 752 proven. 1250 refuted. 0 times theorem prover too weak. 1200 trivial. 0 not checked. [2020-07-20 11:54:28,514 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [584749783] [2020-07-20 11:54:28,514 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:54:28,514 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 31] total 32 [2020-07-20 11:54:28,514 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1313177720] [2020-07-20 11:54:28,515 INFO L459 AbstractCegarLoop]: Interpolant automaton has 32 states [2020-07-20 11:54:28,515 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:54:28,515 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2020-07-20 11:54:28,516 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=439, Invalid=553, Unknown=0, NotChecked=0, Total=992 [2020-07-20 11:54:28,516 INFO L87 Difference]: Start difference. First operand 224 states and 239 transitions. Second operand 32 states. [2020-07-20 11:54:28,890 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:54:28,890 INFO L93 Difference]: Finished difference Result 243 states and 260 transitions. [2020-07-20 11:54:28,895 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2020-07-20 11:54:28,895 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 269 [2020-07-20 11:54:28,896 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:54:28,897 INFO L225 Difference]: With dead ends: 243 [2020-07-20 11:54:28,897 INFO L226 Difference]: Without dead ends: 241 [2020-07-20 11:54:28,897 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 538 GetRequests, 455 SyntacticMatches, 52 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 857 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=443, Invalid=613, Unknown=0, NotChecked=0, Total=1056 [2020-07-20 11:54:28,898 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 241 states. [2020-07-20 11:54:28,907 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 241 to 236. [2020-07-20 11:54:28,907 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 236 states. [2020-07-20 11:54:28,908 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 236 states to 236 states and 252 transitions. [2020-07-20 11:54:28,909 INFO L78 Accepts]: Start accepts. Automaton has 236 states and 252 transitions. Word has length 269 [2020-07-20 11:54:28,909 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:54:28,909 INFO L479 AbstractCegarLoop]: Abstraction has 236 states and 252 transitions. [2020-07-20 11:54:28,909 INFO L480 AbstractCegarLoop]: Interpolant automaton has 32 states. [2020-07-20 11:54:28,909 INFO L276 IsEmpty]: Start isEmpty. Operand 236 states and 252 transitions. [2020-07-20 11:54:28,911 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 286 [2020-07-20 11:54:28,911 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:54:28,911 INFO L422 BasicCegarLoop]: trace histogram [28, 28, 28, 27, 27, 27, 27, 27, 27, 26, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:54:29,125 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 42 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:54:29,126 INFO L427 AbstractCegarLoop]: === Iteration 42 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:54:29,126 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:54:29,126 INFO L82 PathProgramCache]: Analyzing trace with hash 167610380, now seen corresponding path program 39 times [2020-07-20 11:54:29,127 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:54:29,127 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [10774030] [2020-07-20 11:54:29,127 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 43 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 43 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:54:29,240 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:54:29,243 INFO L263 TraceCheckSpWp]: Trace formula consists of 762 conjuncts, 56 conjunts are in the unsatisfiable core [2020-07-20 11:54:29,246 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:54:30,929 INFO L134 CoverageAnalysis]: Checked inductivity of 3618 backedges. 1612 proven. 702 refuted. 0 times theorem prover too weak. 1304 trivial. 0 not checked. [2020-07-20 11:54:30,930 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:54:32,888 INFO L134 CoverageAnalysis]: Checked inductivity of 3618 backedges. 1510 proven. 702 refuted. 0 times theorem prover too weak. 1406 trivial. 0 not checked. [2020-07-20 11:54:32,888 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [10774030] [2020-07-20 11:54:32,888 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:54:32,889 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [56, 56] total 83 [2020-07-20 11:54:32,889 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [337777027] [2020-07-20 11:54:32,890 INFO L459 AbstractCegarLoop]: Interpolant automaton has 83 states [2020-07-20 11:54:32,890 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:54:32,890 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 83 interpolants. [2020-07-20 11:54:32,891 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1594, Invalid=5212, Unknown=0, NotChecked=0, Total=6806 [2020-07-20 11:54:32,891 INFO L87 Difference]: Start difference. First operand 236 states and 252 transitions. Second operand 83 states. [2020-07-20 11:54:35,124 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:54:35,124 INFO L93 Difference]: Finished difference Result 467 states and 564 transitions. [2020-07-20 11:54:35,125 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 56 states. [2020-07-20 11:54:35,125 INFO L78 Accepts]: Start accepts. Automaton has 83 states. Word has length 285 [2020-07-20 11:54:35,125 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:54:35,127 INFO L225 Difference]: With dead ends: 467 [2020-07-20 11:54:35,127 INFO L226 Difference]: Without dead ends: 346 [2020-07-20 11:54:35,128 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 596 GetRequests, 461 SyntacticMatches, 27 SemanticMatches, 108 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3133 ImplicationChecksByTransitivity, 4.2s TimeCoverageRelationStatistics Valid=3133, Invalid=8857, Unknown=0, NotChecked=0, Total=11990 [2020-07-20 11:54:35,129 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 346 states. [2020-07-20 11:54:35,138 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 346 to 238. [2020-07-20 11:54:35,138 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 238 states. [2020-07-20 11:54:35,139 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 238 states to 238 states and 254 transitions. [2020-07-20 11:54:35,139 INFO L78 Accepts]: Start accepts. Automaton has 238 states and 254 transitions. Word has length 285 [2020-07-20 11:54:35,140 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:54:35,140 INFO L479 AbstractCegarLoop]: Abstraction has 238 states and 254 transitions. [2020-07-20 11:54:35,140 INFO L480 AbstractCegarLoop]: Interpolant automaton has 83 states. [2020-07-20 11:54:35,140 INFO L276 IsEmpty]: Start isEmpty. Operand 238 states and 254 transitions. [2020-07-20 11:54:35,141 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 288 [2020-07-20 11:54:35,142 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:54:35,142 INFO L422 BasicCegarLoop]: trace histogram [28, 28, 28, 28, 27, 27, 27, 27, 27, 27, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:54:35,354 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 43 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:54:35,355 INFO L427 AbstractCegarLoop]: === Iteration 43 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:54:35,355 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:54:35,356 INFO L82 PathProgramCache]: Analyzing trace with hash 196225073, now seen corresponding path program 40 times [2020-07-20 11:54:35,356 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:54:35,356 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1932618990] [2020-07-20 11:54:35,356 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 44 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 44 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:54:35,467 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:54:35,469 INFO L263 TraceCheckSpWp]: Trace formula consists of 772 conjuncts, 58 conjunts are in the unsatisfiable core [2020-07-20 11:54:35,472 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:54:37,239 INFO L134 CoverageAnalysis]: Checked inductivity of 3672 backedges. 1512 proven. 756 refuted. 0 times theorem prover too weak. 1404 trivial. 0 not checked. [2020-07-20 11:54:37,240 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:54:39,338 INFO L134 CoverageAnalysis]: Checked inductivity of 3672 backedges. 1512 proven. 756 refuted. 0 times theorem prover too weak. 1404 trivial. 0 not checked. [2020-07-20 11:54:39,338 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1932618990] [2020-07-20 11:54:39,338 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:54:39,339 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [58, 58] total 86 [2020-07-20 11:54:39,339 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2035584238] [2020-07-20 11:54:39,340 INFO L459 AbstractCegarLoop]: Interpolant automaton has 86 states [2020-07-20 11:54:39,340 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:54:39,340 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 86 interpolants. [2020-07-20 11:54:39,341 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1709, Invalid=5601, Unknown=0, NotChecked=0, Total=7310 [2020-07-20 11:54:39,341 INFO L87 Difference]: Start difference. First operand 238 states and 254 transitions. Second operand 86 states. [2020-07-20 11:54:41,706 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:54:41,707 INFO L93 Difference]: Finished difference Result 471 states and 571 transitions. [2020-07-20 11:54:41,707 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 58 states. [2020-07-20 11:54:41,707 INFO L78 Accepts]: Start accepts. Automaton has 86 states. Word has length 287 [2020-07-20 11:54:41,707 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:54:41,709 INFO L225 Difference]: With dead ends: 471 [2020-07-20 11:54:41,709 INFO L226 Difference]: Without dead ends: 352 [2020-07-20 11:54:41,710 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 601 GetRequests, 461 SyntacticMatches, 28 SemanticMatches, 112 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3375 ImplicationChecksByTransitivity, 4.6s TimeCoverageRelationStatistics Valid=3361, Invalid=9521, Unknown=0, NotChecked=0, Total=12882 [2020-07-20 11:54:41,711 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 352 states. [2020-07-20 11:54:41,721 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 352 to 240. [2020-07-20 11:54:41,722 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 240 states. [2020-07-20 11:54:41,722 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 240 states to 240 states and 256 transitions. [2020-07-20 11:54:41,723 INFO L78 Accepts]: Start accepts. Automaton has 240 states and 256 transitions. Word has length 287 [2020-07-20 11:54:41,723 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:54:41,723 INFO L479 AbstractCegarLoop]: Abstraction has 240 states and 256 transitions. [2020-07-20 11:54:41,723 INFO L480 AbstractCegarLoop]: Interpolant automaton has 86 states. [2020-07-20 11:54:41,723 INFO L276 IsEmpty]: Start isEmpty. Operand 240 states and 256 transitions. [2020-07-20 11:54:41,725 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 290 [2020-07-20 11:54:41,725 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:54:41,725 INFO L422 BasicCegarLoop]: trace histogram [29, 28, 28, 28, 28, 27, 27, 27, 27, 27, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:54:41,939 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 44 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:54:41,940 INFO L427 AbstractCegarLoop]: === Iteration 44 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:54:41,940 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:54:41,941 INFO L82 PathProgramCache]: Analyzing trace with hash 1925141270, now seen corresponding path program 41 times [2020-07-20 11:54:41,941 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:54:41,941 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [495494768] [2020-07-20 11:54:41,941 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 45 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 45 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:54:42,056 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:54:42,058 INFO L263 TraceCheckSpWp]: Trace formula consists of 782 conjuncts, 59 conjunts are in the unsatisfiable core [2020-07-20 11:54:42,062 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:54:42,641 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 11:54:42,736 INFO L134 CoverageAnalysis]: Checked inductivity of 3728 backedges. 866 proven. 1458 refuted. 0 times theorem prover too weak. 1404 trivial. 0 not checked. [2020-07-20 11:54:42,737 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:54:42,779 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:54:44,039 INFO L134 CoverageAnalysis]: Checked inductivity of 3728 backedges. 866 proven. 1458 refuted. 0 times theorem prover too weak. 1404 trivial. 0 not checked. [2020-07-20 11:54:44,039 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [495494768] [2020-07-20 11:54:44,039 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:54:44,040 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 33] total 34 [2020-07-20 11:54:44,040 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [891390153] [2020-07-20 11:54:44,040 INFO L459 AbstractCegarLoop]: Interpolant automaton has 34 states [2020-07-20 11:54:44,040 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:54:44,041 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2020-07-20 11:54:44,041 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=500, Invalid=622, Unknown=0, NotChecked=0, Total=1122 [2020-07-20 11:54:44,041 INFO L87 Difference]: Start difference. First operand 240 states and 256 transitions. Second operand 34 states. [2020-07-20 11:54:44,454 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:54:44,455 INFO L93 Difference]: Finished difference Result 259 states and 277 transitions. [2020-07-20 11:54:44,455 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2020-07-20 11:54:44,456 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 289 [2020-07-20 11:54:44,456 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:54:44,457 INFO L225 Difference]: With dead ends: 259 [2020-07-20 11:54:44,457 INFO L226 Difference]: Without dead ends: 257 [2020-07-20 11:54:44,458 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 578 GetRequests, 489 SyntacticMatches, 56 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 979 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=504, Invalid=686, Unknown=0, NotChecked=0, Total=1190 [2020-07-20 11:54:44,458 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 257 states. [2020-07-20 11:54:44,468 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 257 to 252. [2020-07-20 11:54:44,468 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 252 states. [2020-07-20 11:54:44,469 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 252 states to 252 states and 269 transitions. [2020-07-20 11:54:44,469 INFO L78 Accepts]: Start accepts. Automaton has 252 states and 269 transitions. Word has length 289 [2020-07-20 11:54:44,469 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:54:44,469 INFO L479 AbstractCegarLoop]: Abstraction has 252 states and 269 transitions. [2020-07-20 11:54:44,469 INFO L480 AbstractCegarLoop]: Interpolant automaton has 34 states. [2020-07-20 11:54:44,470 INFO L276 IsEmpty]: Start isEmpty. Operand 252 states and 269 transitions. [2020-07-20 11:54:44,471 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 306 [2020-07-20 11:54:44,471 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:54:44,472 INFO L422 BasicCegarLoop]: trace histogram [30, 30, 30, 29, 29, 29, 29, 29, 29, 28, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:54:44,685 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 45 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:54:44,686 INFO L427 AbstractCegarLoop]: === Iteration 45 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:54:44,686 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:54:44,686 INFO L82 PathProgramCache]: Analyzing trace with hash -2144237320, now seen corresponding path program 42 times [2020-07-20 11:54:44,687 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:54:44,687 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [449684581] [2020-07-20 11:54:44,687 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 46 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 46 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:54:44,810 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:54:44,812 INFO L263 TraceCheckSpWp]: Trace formula consists of 816 conjuncts, 60 conjunts are in the unsatisfiable core [2020-07-20 11:54:44,815 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:54:46,782 INFO L134 CoverageAnalysis]: Checked inductivity of 4176 backedges. 1848 proven. 812 refuted. 0 times theorem prover too weak. 1516 trivial. 0 not checked. [2020-07-20 11:54:46,782 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:54:49,081 INFO L134 CoverageAnalysis]: Checked inductivity of 4176 backedges. 1738 proven. 812 refuted. 0 times theorem prover too weak. 1626 trivial. 0 not checked. [2020-07-20 11:54:49,081 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [449684581] [2020-07-20 11:54:49,081 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:54:49,081 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [60, 60] total 89 [2020-07-20 11:54:49,082 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1183456905] [2020-07-20 11:54:49,086 INFO L459 AbstractCegarLoop]: Interpolant automaton has 89 states [2020-07-20 11:54:49,086 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:54:49,086 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 89 interpolants. [2020-07-20 11:54:49,087 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1828, Invalid=6004, Unknown=0, NotChecked=0, Total=7832 [2020-07-20 11:54:49,088 INFO L87 Difference]: Start difference. First operand 252 states and 269 transitions. Second operand 89 states. [2020-07-20 11:54:51,644 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:54:51,644 INFO L93 Difference]: Finished difference Result 499 states and 603 transitions. [2020-07-20 11:54:51,645 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 60 states. [2020-07-20 11:54:51,645 INFO L78 Accepts]: Start accepts. Automaton has 89 states. Word has length 305 [2020-07-20 11:54:51,645 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:54:51,647 INFO L225 Difference]: With dead ends: 499 [2020-07-20 11:54:51,647 INFO L226 Difference]: Without dead ends: 370 [2020-07-20 11:54:51,649 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 638 GetRequests, 493 SyntacticMatches, 29 SemanticMatches, 116 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3626 ImplicationChecksByTransitivity, 5.0s TimeCoverageRelationStatistics Valid=3597, Invalid=10209, Unknown=0, NotChecked=0, Total=13806 [2020-07-20 11:54:51,649 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 370 states. [2020-07-20 11:54:51,660 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 370 to 254. [2020-07-20 11:54:51,660 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 254 states. [2020-07-20 11:54:51,661 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 254 states to 254 states and 271 transitions. [2020-07-20 11:54:51,661 INFO L78 Accepts]: Start accepts. Automaton has 254 states and 271 transitions. Word has length 305 [2020-07-20 11:54:51,661 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:54:51,662 INFO L479 AbstractCegarLoop]: Abstraction has 254 states and 271 transitions. [2020-07-20 11:54:51,662 INFO L480 AbstractCegarLoop]: Interpolant automaton has 89 states. [2020-07-20 11:54:51,662 INFO L276 IsEmpty]: Start isEmpty. Operand 254 states and 271 transitions. [2020-07-20 11:54:51,663 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 308 [2020-07-20 11:54:51,664 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:54:51,664 INFO L422 BasicCegarLoop]: trace histogram [30, 30, 30, 30, 29, 29, 29, 29, 29, 29, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:54:51,877 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 46 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:54:51,878 INFO L427 AbstractCegarLoop]: === Iteration 46 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:54:51,878 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:54:51,878 INFO L82 PathProgramCache]: Analyzing trace with hash 191997085, now seen corresponding path program 43 times [2020-07-20 11:54:51,879 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:54:51,879 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1222765484] [2020-07-20 11:54:51,879 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 47 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 47 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:54:52,011 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:54:52,015 INFO L263 TraceCheckSpWp]: Trace formula consists of 826 conjuncts, 62 conjunts are in the unsatisfiable core [2020-07-20 11:54:52,019 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:54:54,094 INFO L134 CoverageAnalysis]: Checked inductivity of 4234 backedges. 1740 proven. 870 refuted. 0 times theorem prover too weak. 1624 trivial. 0 not checked. [2020-07-20 11:54:54,094 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:54:56,589 INFO L134 CoverageAnalysis]: Checked inductivity of 4234 backedges. 1740 proven. 870 refuted. 0 times theorem prover too weak. 1624 trivial. 0 not checked. [2020-07-20 11:54:56,590 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1222765484] [2020-07-20 11:54:56,590 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:54:56,590 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [62, 62] total 92 [2020-07-20 11:54:56,590 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [285266430] [2020-07-20 11:54:56,591 INFO L459 AbstractCegarLoop]: Interpolant automaton has 92 states [2020-07-20 11:54:56,591 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:54:56,591 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 92 interpolants. [2020-07-20 11:54:56,591 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1951, Invalid=6421, Unknown=0, NotChecked=0, Total=8372 [2020-07-20 11:54:56,591 INFO L87 Difference]: Start difference. First operand 254 states and 271 transitions. Second operand 92 states. [2020-07-20 11:54:59,272 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:54:59,273 INFO L93 Difference]: Finished difference Result 503 states and 610 transitions. [2020-07-20 11:54:59,273 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 62 states. [2020-07-20 11:54:59,273 INFO L78 Accepts]: Start accepts. Automaton has 92 states. Word has length 307 [2020-07-20 11:54:59,273 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:54:59,275 INFO L225 Difference]: With dead ends: 503 [2020-07-20 11:54:59,275 INFO L226 Difference]: Without dead ends: 376 [2020-07-20 11:54:59,276 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 643 GetRequests, 493 SyntacticMatches, 30 SemanticMatches, 120 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3886 ImplicationChecksByTransitivity, 5.4s TimeCoverageRelationStatistics Valid=3841, Invalid=10921, Unknown=0, NotChecked=0, Total=14762 [2020-07-20 11:54:59,276 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 376 states. [2020-07-20 11:54:59,288 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 376 to 256. [2020-07-20 11:54:59,288 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 256 states. [2020-07-20 11:54:59,289 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 256 states to 256 states and 273 transitions. [2020-07-20 11:54:59,289 INFO L78 Accepts]: Start accepts. Automaton has 256 states and 273 transitions. Word has length 307 [2020-07-20 11:54:59,289 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:54:59,289 INFO L479 AbstractCegarLoop]: Abstraction has 256 states and 273 transitions. [2020-07-20 11:54:59,290 INFO L480 AbstractCegarLoop]: Interpolant automaton has 92 states. [2020-07-20 11:54:59,290 INFO L276 IsEmpty]: Start isEmpty. Operand 256 states and 273 transitions. [2020-07-20 11:54:59,291 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 310 [2020-07-20 11:54:59,292 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:54:59,292 INFO L422 BasicCegarLoop]: trace histogram [31, 30, 30, 30, 30, 29, 29, 29, 29, 29, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:54:59,507 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 47 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:54:59,508 INFO L427 AbstractCegarLoop]: === Iteration 47 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:54:59,508 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:54:59,508 INFO L82 PathProgramCache]: Analyzing trace with hash -954635518, now seen corresponding path program 44 times [2020-07-20 11:54:59,508 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:54:59,508 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [670598341] [2020-07-20 11:54:59,508 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 48 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 48 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:54:59,640 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:54:59,642 INFO L263 TraceCheckSpWp]: Trace formula consists of 836 conjuncts, 63 conjunts are in the unsatisfiable core [2020-07-20 11:54:59,645 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:55:00,332 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 11:55:00,435 INFO L134 CoverageAnalysis]: Checked inductivity of 4294 backedges. 988 proven. 1682 refuted. 0 times theorem prover too weak. 1624 trivial. 0 not checked. [2020-07-20 11:55:00,435 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:55:00,482 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:55:01,870 INFO L134 CoverageAnalysis]: Checked inductivity of 4294 backedges. 988 proven. 1682 refuted. 0 times theorem prover too weak. 1624 trivial. 0 not checked. [2020-07-20 11:55:01,870 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [670598341] [2020-07-20 11:55:01,870 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:55:01,870 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 35] total 36 [2020-07-20 11:55:01,871 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [7921029] [2020-07-20 11:55:01,871 INFO L459 AbstractCegarLoop]: Interpolant automaton has 36 states [2020-07-20 11:55:01,871 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:55:01,871 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2020-07-20 11:55:01,871 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=565, Invalid=695, Unknown=0, NotChecked=0, Total=1260 [2020-07-20 11:55:01,872 INFO L87 Difference]: Start difference. First operand 256 states and 273 transitions. Second operand 36 states. [2020-07-20 11:55:02,349 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:55:02,350 INFO L93 Difference]: Finished difference Result 275 states and 294 transitions. [2020-07-20 11:55:02,350 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2020-07-20 11:55:02,351 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 309 [2020-07-20 11:55:02,351 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:55:02,353 INFO L225 Difference]: With dead ends: 275 [2020-07-20 11:55:02,353 INFO L226 Difference]: Without dead ends: 273 [2020-07-20 11:55:02,353 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 618 GetRequests, 523 SyntacticMatches, 60 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1109 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=569, Invalid=763, Unknown=0, NotChecked=0, Total=1332 [2020-07-20 11:55:02,354 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 273 states. [2020-07-20 11:55:02,364 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 273 to 268. [2020-07-20 11:55:02,365 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 268 states. [2020-07-20 11:55:02,366 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 268 states to 268 states and 286 transitions. [2020-07-20 11:55:02,366 INFO L78 Accepts]: Start accepts. Automaton has 268 states and 286 transitions. Word has length 309 [2020-07-20 11:55:02,366 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:55:02,366 INFO L479 AbstractCegarLoop]: Abstraction has 268 states and 286 transitions. [2020-07-20 11:55:02,367 INFO L480 AbstractCegarLoop]: Interpolant automaton has 36 states. [2020-07-20 11:55:02,367 INFO L276 IsEmpty]: Start isEmpty. Operand 268 states and 286 transitions. [2020-07-20 11:55:02,369 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 326 [2020-07-20 11:55:02,369 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:55:02,369 INFO L422 BasicCegarLoop]: trace histogram [32, 32, 32, 31, 31, 31, 31, 31, 31, 30, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:55:02,582 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 48 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:55:02,583 INFO L427 AbstractCegarLoop]: === Iteration 48 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:55:02,583 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:55:02,583 INFO L82 PathProgramCache]: Analyzing trace with hash -2146023196, now seen corresponding path program 45 times [2020-07-20 11:55:02,583 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:55:02,583 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1723853382] [2020-07-20 11:55:02,583 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 49 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 49 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:55:02,705 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:55:02,707 INFO L263 TraceCheckSpWp]: Trace formula consists of 870 conjuncts, 64 conjunts are in the unsatisfiable core [2020-07-20 11:55:02,710 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:55:05,009 INFO L134 CoverageAnalysis]: Checked inductivity of 4774 backedges. 2100 proven. 930 refuted. 0 times theorem prover too weak. 1744 trivial. 0 not checked. [2020-07-20 11:55:05,009 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:55:07,716 INFO L134 CoverageAnalysis]: Checked inductivity of 4774 backedges. 1982 proven. 930 refuted. 0 times theorem prover too weak. 1862 trivial. 0 not checked. [2020-07-20 11:55:07,716 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1723853382] [2020-07-20 11:55:07,716 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:55:07,716 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [64, 64] total 95 [2020-07-20 11:55:07,717 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1914540462] [2020-07-20 11:55:07,717 INFO L459 AbstractCegarLoop]: Interpolant automaton has 95 states [2020-07-20 11:55:07,717 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:55:07,718 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 95 interpolants. [2020-07-20 11:55:07,719 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2078, Invalid=6852, Unknown=0, NotChecked=0, Total=8930 [2020-07-20 11:55:07,719 INFO L87 Difference]: Start difference. First operand 268 states and 286 transitions. Second operand 95 states. [2020-07-20 11:55:11,665 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:55:11,666 INFO L93 Difference]: Finished difference Result 531 states and 642 transitions. [2020-07-20 11:55:11,666 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 64 states. [2020-07-20 11:55:11,666 INFO L78 Accepts]: Start accepts. Automaton has 95 states. Word has length 325 [2020-07-20 11:55:11,667 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:55:11,669 INFO L225 Difference]: With dead ends: 531 [2020-07-20 11:55:11,669 INFO L226 Difference]: Without dead ends: 394 [2020-07-20 11:55:11,672 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 680 GetRequests, 525 SyntacticMatches, 31 SemanticMatches, 124 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4155 ImplicationChecksByTransitivity, 6.4s TimeCoverageRelationStatistics Valid=4093, Invalid=11657, Unknown=0, NotChecked=0, Total=15750 [2020-07-20 11:55:11,672 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 394 states. [2020-07-20 11:55:11,691 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 394 to 270. [2020-07-20 11:55:11,691 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 270 states. [2020-07-20 11:55:11,693 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 270 states to 270 states and 288 transitions. [2020-07-20 11:55:11,693 INFO L78 Accepts]: Start accepts. Automaton has 270 states and 288 transitions. Word has length 325 [2020-07-20 11:55:11,694 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:55:11,694 INFO L479 AbstractCegarLoop]: Abstraction has 270 states and 288 transitions. [2020-07-20 11:55:11,694 INFO L480 AbstractCegarLoop]: Interpolant automaton has 95 states. [2020-07-20 11:55:11,694 INFO L276 IsEmpty]: Start isEmpty. Operand 270 states and 288 transitions. [2020-07-20 11:55:11,698 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 328 [2020-07-20 11:55:11,698 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:55:11,698 INFO L422 BasicCegarLoop]: trace histogram [32, 32, 32, 32, 31, 31, 31, 31, 31, 31, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:55:11,911 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 49 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:55:11,912 INFO L427 AbstractCegarLoop]: === Iteration 49 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:55:11,912 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:55:11,912 INFO L82 PathProgramCache]: Analyzing trace with hash 735125513, now seen corresponding path program 46 times [2020-07-20 11:55:11,913 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:55:11,913 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [481808245] [2020-07-20 11:55:11,913 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 50 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 50 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:55:12,091 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:55:12,097 INFO L263 TraceCheckSpWp]: Trace formula consists of 880 conjuncts, 66 conjunts are in the unsatisfiable core [2020-07-20 11:55:12,103 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:55:15,330 INFO L134 CoverageAnalysis]: Checked inductivity of 4836 backedges. 1984 proven. 992 refuted. 0 times theorem prover too weak. 1860 trivial. 0 not checked. [2020-07-20 11:55:15,330 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:55:18,237 INFO L134 CoverageAnalysis]: Checked inductivity of 4836 backedges. 1984 proven. 992 refuted. 0 times theorem prover too weak. 1860 trivial. 0 not checked. [2020-07-20 11:55:18,238 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [481808245] [2020-07-20 11:55:18,238 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:55:18,238 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [66, 66] total 98 [2020-07-20 11:55:18,238 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1643798368] [2020-07-20 11:55:18,239 INFO L459 AbstractCegarLoop]: Interpolant automaton has 98 states [2020-07-20 11:55:18,239 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:55:18,239 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 98 interpolants. [2020-07-20 11:55:18,240 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2209, Invalid=7297, Unknown=0, NotChecked=0, Total=9506 [2020-07-20 11:55:18,240 INFO L87 Difference]: Start difference. First operand 270 states and 288 transitions. Second operand 98 states. [2020-07-20 11:55:21,297 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:55:21,298 INFO L93 Difference]: Finished difference Result 535 states and 649 transitions. [2020-07-20 11:55:21,298 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 66 states. [2020-07-20 11:55:21,298 INFO L78 Accepts]: Start accepts. Automaton has 98 states. Word has length 327 [2020-07-20 11:55:21,298 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:55:21,300 INFO L225 Difference]: With dead ends: 535 [2020-07-20 11:55:21,300 INFO L226 Difference]: Without dead ends: 400 [2020-07-20 11:55:21,302 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 685 GetRequests, 525 SyntacticMatches, 32 SemanticMatches, 128 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4433 ImplicationChecksByTransitivity, 7.2s TimeCoverageRelationStatistics Valid=4353, Invalid=12417, Unknown=0, NotChecked=0, Total=16770 [2020-07-20 11:55:21,302 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 400 states. [2020-07-20 11:55:21,314 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 400 to 272. [2020-07-20 11:55:21,314 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 272 states. [2020-07-20 11:55:21,315 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 272 states to 272 states and 290 transitions. [2020-07-20 11:55:21,315 INFO L78 Accepts]: Start accepts. Automaton has 272 states and 290 transitions. Word has length 327 [2020-07-20 11:55:21,315 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:55:21,316 INFO L479 AbstractCegarLoop]: Abstraction has 272 states and 290 transitions. [2020-07-20 11:55:21,316 INFO L480 AbstractCegarLoop]: Interpolant automaton has 98 states. [2020-07-20 11:55:21,316 INFO L276 IsEmpty]: Start isEmpty. Operand 272 states and 290 transitions. [2020-07-20 11:55:21,318 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 330 [2020-07-20 11:55:21,318 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:55:21,318 INFO L422 BasicCegarLoop]: trace histogram [33, 32, 32, 32, 32, 31, 31, 31, 31, 31, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:55:21,532 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 50 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:55:21,533 INFO L427 AbstractCegarLoop]: === Iteration 50 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:55:21,533 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:55:21,534 INFO L82 PathProgramCache]: Analyzing trace with hash -734871058, now seen corresponding path program 47 times [2020-07-20 11:55:21,534 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:55:21,534 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1656355238] [2020-07-20 11:55:21,534 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 51 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 51 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:55:21,660 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:55:21,663 INFO L263 TraceCheckSpWp]: Trace formula consists of 890 conjuncts, 67 conjunts are in the unsatisfiable core [2020-07-20 11:55:21,667 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:55:22,476 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 11:55:22,581 INFO L134 CoverageAnalysis]: Checked inductivity of 4900 backedges. 1118 proven. 1922 refuted. 0 times theorem prover too weak. 1860 trivial. 0 not checked. [2020-07-20 11:55:22,581 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:55:22,632 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:55:24,267 INFO L134 CoverageAnalysis]: Checked inductivity of 4900 backedges. 1118 proven. 1922 refuted. 0 times theorem prover too weak. 1860 trivial. 0 not checked. [2020-07-20 11:55:24,267 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1656355238] [2020-07-20 11:55:24,268 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:55:24,268 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37, 37] total 38 [2020-07-20 11:55:24,268 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [181253485] [2020-07-20 11:55:24,268 INFO L459 AbstractCegarLoop]: Interpolant automaton has 38 states [2020-07-20 11:55:24,268 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:55:24,269 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2020-07-20 11:55:24,269 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=634, Invalid=772, Unknown=0, NotChecked=0, Total=1406 [2020-07-20 11:55:24,269 INFO L87 Difference]: Start difference. First operand 272 states and 290 transitions. Second operand 38 states. [2020-07-20 11:55:24,732 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:55:24,732 INFO L93 Difference]: Finished difference Result 291 states and 311 transitions. [2020-07-20 11:55:24,733 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2020-07-20 11:55:24,733 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 329 [2020-07-20 11:55:24,734 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:55:24,736 INFO L225 Difference]: With dead ends: 291 [2020-07-20 11:55:24,736 INFO L226 Difference]: Without dead ends: 289 [2020-07-20 11:55:24,736 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 658 GetRequests, 557 SyntacticMatches, 64 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1247 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=638, Invalid=844, Unknown=0, NotChecked=0, Total=1482 [2020-07-20 11:55:24,736 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 289 states. [2020-07-20 11:55:24,748 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 289 to 284. [2020-07-20 11:55:24,748 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 284 states. [2020-07-20 11:55:24,749 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 284 states to 284 states and 303 transitions. [2020-07-20 11:55:24,749 INFO L78 Accepts]: Start accepts. Automaton has 284 states and 303 transitions. Word has length 329 [2020-07-20 11:55:24,749 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:55:24,749 INFO L479 AbstractCegarLoop]: Abstraction has 284 states and 303 transitions. [2020-07-20 11:55:24,750 INFO L480 AbstractCegarLoop]: Interpolant automaton has 38 states. [2020-07-20 11:55:24,750 INFO L276 IsEmpty]: Start isEmpty. Operand 284 states and 303 transitions. [2020-07-20 11:55:24,751 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 346 [2020-07-20 11:55:24,752 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:55:24,752 INFO L422 BasicCegarLoop]: trace histogram [34, 34, 34, 33, 33, 33, 33, 33, 33, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:55:24,965 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 51 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:55:24,966 INFO L427 AbstractCegarLoop]: === Iteration 51 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:55:24,966 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:55:24,967 INFO L82 PathProgramCache]: Analyzing trace with hash -1470347312, now seen corresponding path program 48 times [2020-07-20 11:55:24,967 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:55:24,967 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [831809733] [2020-07-20 11:55:24,968 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 52 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 52 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:55:25,098 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:55:25,100 INFO L263 TraceCheckSpWp]: Trace formula consists of 924 conjuncts, 68 conjunts are in the unsatisfiable core [2020-07-20 11:55:25,103 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:55:27,730 INFO L134 CoverageAnalysis]: Checked inductivity of 5412 backedges. 2368 proven. 1056 refuted. 0 times theorem prover too weak. 1988 trivial. 0 not checked. [2020-07-20 11:55:27,730 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:55:30,849 INFO L134 CoverageAnalysis]: Checked inductivity of 5412 backedges. 2242 proven. 1056 refuted. 0 times theorem prover too weak. 2114 trivial. 0 not checked. [2020-07-20 11:55:30,850 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [831809733] [2020-07-20 11:55:30,850 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:55:30,850 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [68, 68] total 101 [2020-07-20 11:55:30,850 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1220681654] [2020-07-20 11:55:30,851 INFO L459 AbstractCegarLoop]: Interpolant automaton has 101 states [2020-07-20 11:55:30,851 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:55:30,851 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 101 interpolants. [2020-07-20 11:55:30,852 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2344, Invalid=7756, Unknown=0, NotChecked=0, Total=10100 [2020-07-20 11:55:30,852 INFO L87 Difference]: Start difference. First operand 284 states and 303 transitions. Second operand 101 states. [2020-07-20 11:55:34,744 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:55:34,745 INFO L93 Difference]: Finished difference Result 563 states and 681 transitions. [2020-07-20 11:55:34,745 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 68 states. [2020-07-20 11:55:34,745 INFO L78 Accepts]: Start accepts. Automaton has 101 states. Word has length 345 [2020-07-20 11:55:34,746 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:55:34,747 INFO L225 Difference]: With dead ends: 563 [2020-07-20 11:55:34,748 INFO L226 Difference]: Without dead ends: 418 [2020-07-20 11:55:34,749 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 722 GetRequests, 557 SyntacticMatches, 33 SemanticMatches, 132 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4720 ImplicationChecksByTransitivity, 6.9s TimeCoverageRelationStatistics Valid=4621, Invalid=13201, Unknown=0, NotChecked=0, Total=17822 [2020-07-20 11:55:34,750 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 418 states. [2020-07-20 11:55:34,760 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 418 to 286. [2020-07-20 11:55:34,760 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 286 states. [2020-07-20 11:55:34,761 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 286 states to 286 states and 305 transitions. [2020-07-20 11:55:34,761 INFO L78 Accepts]: Start accepts. Automaton has 286 states and 305 transitions. Word has length 345 [2020-07-20 11:55:34,761 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:55:34,762 INFO L479 AbstractCegarLoop]: Abstraction has 286 states and 305 transitions. [2020-07-20 11:55:34,762 INFO L480 AbstractCegarLoop]: Interpolant automaton has 101 states. [2020-07-20 11:55:34,762 INFO L276 IsEmpty]: Start isEmpty. Operand 286 states and 305 transitions. [2020-07-20 11:55:34,764 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 348 [2020-07-20 11:55:34,764 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:55:34,764 INFO L422 BasicCegarLoop]: trace histogram [34, 34, 34, 34, 33, 33, 33, 33, 33, 33, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:55:34,970 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 52 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:55:34,970 INFO L427 AbstractCegarLoop]: === Iteration 52 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:55:34,970 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:55:34,971 INFO L82 PathProgramCache]: Analyzing trace with hash 2069961333, now seen corresponding path program 49 times [2020-07-20 11:55:34,971 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:55:34,971 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1741517656] [2020-07-20 11:55:34,971 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 53 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 53 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:55:35,102 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:55:35,105 INFO L263 TraceCheckSpWp]: Trace formula consists of 934 conjuncts, 70 conjunts are in the unsatisfiable core [2020-07-20 11:55:35,109 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:55:37,963 INFO L134 CoverageAnalysis]: Checked inductivity of 5478 backedges. 2244 proven. 1122 refuted. 0 times theorem prover too weak. 2112 trivial. 0 not checked. [2020-07-20 11:55:37,963 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:55:41,345 INFO L134 CoverageAnalysis]: Checked inductivity of 5478 backedges. 2244 proven. 1122 refuted. 0 times theorem prover too weak. 2112 trivial. 0 not checked. [2020-07-20 11:55:41,345 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1741517656] [2020-07-20 11:55:41,345 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:55:41,346 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [70, 70] total 104 [2020-07-20 11:55:41,346 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1723963383] [2020-07-20 11:55:41,346 INFO L459 AbstractCegarLoop]: Interpolant automaton has 104 states [2020-07-20 11:55:41,346 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:55:41,347 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 104 interpolants. [2020-07-20 11:55:41,347 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2483, Invalid=8229, Unknown=0, NotChecked=0, Total=10712 [2020-07-20 11:55:41,347 INFO L87 Difference]: Start difference. First operand 286 states and 305 transitions. Second operand 104 states. [2020-07-20 11:55:45,066 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:55:45,066 INFO L93 Difference]: Finished difference Result 567 states and 688 transitions. [2020-07-20 11:55:45,066 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 70 states. [2020-07-20 11:55:45,066 INFO L78 Accepts]: Start accepts. Automaton has 104 states. Word has length 347 [2020-07-20 11:55:45,067 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:55:45,068 INFO L225 Difference]: With dead ends: 567 [2020-07-20 11:55:45,068 INFO L226 Difference]: Without dead ends: 424 [2020-07-20 11:55:45,070 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 727 GetRequests, 557 SyntacticMatches, 34 SemanticMatches, 136 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5016 ImplicationChecksByTransitivity, 7.5s TimeCoverageRelationStatistics Valid=4897, Invalid=14009, Unknown=0, NotChecked=0, Total=18906 [2020-07-20 11:55:45,070 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 424 states. [2020-07-20 11:55:45,083 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 424 to 288. [2020-07-20 11:55:45,083 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 288 states. [2020-07-20 11:55:45,084 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 288 states to 288 states and 307 transitions. [2020-07-20 11:55:45,084 INFO L78 Accepts]: Start accepts. Automaton has 288 states and 307 transitions. Word has length 347 [2020-07-20 11:55:45,084 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:55:45,084 INFO L479 AbstractCegarLoop]: Abstraction has 288 states and 307 transitions. [2020-07-20 11:55:45,084 INFO L480 AbstractCegarLoop]: Interpolant automaton has 104 states. [2020-07-20 11:55:45,085 INFO L276 IsEmpty]: Start isEmpty. Operand 288 states and 307 transitions. [2020-07-20 11:55:45,087 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 350 [2020-07-20 11:55:45,087 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:55:45,087 INFO L422 BasicCegarLoop]: trace histogram [35, 34, 34, 34, 34, 33, 33, 33, 33, 33, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:55:45,302 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 53 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:55:45,303 INFO L427 AbstractCegarLoop]: === Iteration 53 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:55:45,303 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:55:45,303 INFO L82 PathProgramCache]: Analyzing trace with hash -1602496550, now seen corresponding path program 50 times [2020-07-20 11:55:45,303 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:55:45,304 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1513433932] [2020-07-20 11:55:45,304 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 54 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 54 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:55:45,428 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:55:45,430 INFO L263 TraceCheckSpWp]: Trace formula consists of 944 conjuncts, 71 conjunts are in the unsatisfiable core [2020-07-20 11:55:45,434 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:55:46,371 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 11:55:46,488 INFO L134 CoverageAnalysis]: Checked inductivity of 5546 backedges. 1256 proven. 2178 refuted. 0 times theorem prover too weak. 2112 trivial. 0 not checked. [2020-07-20 11:55:46,488 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:55:46,558 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:55:48,455 INFO L134 CoverageAnalysis]: Checked inductivity of 5546 backedges. 1256 proven. 2178 refuted. 0 times theorem prover too weak. 2112 trivial. 0 not checked. [2020-07-20 11:55:48,456 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1513433932] [2020-07-20 11:55:48,456 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:55:48,456 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39, 39] total 40 [2020-07-20 11:55:48,456 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2122932829] [2020-07-20 11:55:48,456 INFO L459 AbstractCegarLoop]: Interpolant automaton has 40 states [2020-07-20 11:55:48,456 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:55:48,457 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2020-07-20 11:55:48,457 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=707, Invalid=853, Unknown=0, NotChecked=0, Total=1560 [2020-07-20 11:55:48,457 INFO L87 Difference]: Start difference. First operand 288 states and 307 transitions. Second operand 40 states. [2020-07-20 11:55:49,020 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:55:49,021 INFO L93 Difference]: Finished difference Result 307 states and 328 transitions. [2020-07-20 11:55:49,021 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2020-07-20 11:55:49,021 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 349 [2020-07-20 11:55:49,022 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:55:49,023 INFO L225 Difference]: With dead ends: 307 [2020-07-20 11:55:49,024 INFO L226 Difference]: Without dead ends: 305 [2020-07-20 11:55:49,024 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 698 GetRequests, 591 SyntacticMatches, 68 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1393 ImplicationChecksByTransitivity, 2.7s TimeCoverageRelationStatistics Valid=711, Invalid=929, Unknown=0, NotChecked=0, Total=1640 [2020-07-20 11:55:49,024 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 305 states. [2020-07-20 11:55:49,034 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 305 to 300. [2020-07-20 11:55:49,034 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 300 states. [2020-07-20 11:55:49,034 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 300 states to 300 states and 320 transitions. [2020-07-20 11:55:49,034 INFO L78 Accepts]: Start accepts. Automaton has 300 states and 320 transitions. Word has length 349 [2020-07-20 11:55:49,035 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:55:49,035 INFO L479 AbstractCegarLoop]: Abstraction has 300 states and 320 transitions. [2020-07-20 11:55:49,035 INFO L480 AbstractCegarLoop]: Interpolant automaton has 40 states. [2020-07-20 11:55:49,035 INFO L276 IsEmpty]: Start isEmpty. Operand 300 states and 320 transitions. [2020-07-20 11:55:49,037 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 366 [2020-07-20 11:55:49,037 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:55:49,037 INFO L422 BasicCegarLoop]: trace histogram [36, 36, 36, 35, 35, 35, 35, 35, 35, 34, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:55:49,250 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 54 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:55:49,250 INFO L427 AbstractCegarLoop]: === Iteration 54 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:55:49,250 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:55:49,251 INFO L82 PathProgramCache]: Analyzing trace with hash 242484668, now seen corresponding path program 51 times [2020-07-20 11:55:49,251 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:55:49,251 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1405499435] [2020-07-20 11:55:49,252 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 55 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 55 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:55:49,388 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:55:49,391 INFO L263 TraceCheckSpWp]: Trace formula consists of 978 conjuncts, 72 conjunts are in the unsatisfiable core [2020-07-20 11:55:49,396 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:55:52,506 INFO L134 CoverageAnalysis]: Checked inductivity of 6090 backedges. 2652 proven. 1190 refuted. 0 times theorem prover too weak. 2248 trivial. 0 not checked. [2020-07-20 11:55:52,507 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:55:56,224 INFO L134 CoverageAnalysis]: Checked inductivity of 6090 backedges. 2518 proven. 1190 refuted. 0 times theorem prover too weak. 2382 trivial. 0 not checked. [2020-07-20 11:55:56,224 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1405499435] [2020-07-20 11:55:56,224 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:55:56,224 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [72, 72] total 107 [2020-07-20 11:55:56,224 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [412877513] [2020-07-20 11:55:56,225 INFO L459 AbstractCegarLoop]: Interpolant automaton has 107 states [2020-07-20 11:55:56,225 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:55:56,226 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 107 interpolants. [2020-07-20 11:55:56,226 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2626, Invalid=8716, Unknown=0, NotChecked=0, Total=11342 [2020-07-20 11:55:56,236 INFO L87 Difference]: Start difference. First operand 300 states and 320 transitions. Second operand 107 states. [2020-07-20 11:56:00,470 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:56:00,471 INFO L93 Difference]: Finished difference Result 595 states and 720 transitions. [2020-07-20 11:56:00,471 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 72 states. [2020-07-20 11:56:00,471 INFO L78 Accepts]: Start accepts. Automaton has 107 states. Word has length 365 [2020-07-20 11:56:00,471 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:56:00,473 INFO L225 Difference]: With dead ends: 595 [2020-07-20 11:56:00,473 INFO L226 Difference]: Without dead ends: 442 [2020-07-20 11:56:00,475 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 764 GetRequests, 589 SyntacticMatches, 35 SemanticMatches, 140 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5321 ImplicationChecksByTransitivity, 8.2s TimeCoverageRelationStatistics Valid=5181, Invalid=14841, Unknown=0, NotChecked=0, Total=20022 [2020-07-20 11:56:00,475 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 442 states. [2020-07-20 11:56:00,488 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 442 to 302. [2020-07-20 11:56:00,488 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 302 states. [2020-07-20 11:56:00,489 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 302 states to 302 states and 322 transitions. [2020-07-20 11:56:00,489 INFO L78 Accepts]: Start accepts. Automaton has 302 states and 322 transitions. Word has length 365 [2020-07-20 11:56:00,489 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:56:00,489 INFO L479 AbstractCegarLoop]: Abstraction has 302 states and 322 transitions. [2020-07-20 11:56:00,489 INFO L480 AbstractCegarLoop]: Interpolant automaton has 107 states. [2020-07-20 11:56:00,490 INFO L276 IsEmpty]: Start isEmpty. Operand 302 states and 322 transitions. [2020-07-20 11:56:00,492 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 368 [2020-07-20 11:56:00,492 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:56:00,492 INFO L422 BasicCegarLoop]: trace histogram [36, 36, 36, 36, 35, 35, 35, 35, 35, 35, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:56:00,706 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 55 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:56:00,707 INFO L427 AbstractCegarLoop]: === Iteration 55 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:56:00,707 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:56:00,707 INFO L82 PathProgramCache]: Analyzing trace with hash -814607391, now seen corresponding path program 52 times [2020-07-20 11:56:00,708 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:56:00,708 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [889623577] [2020-07-20 11:56:00,708 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 56 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 56 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:56:00,848 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:56:00,851 INFO L263 TraceCheckSpWp]: Trace formula consists of 988 conjuncts, 74 conjunts are in the unsatisfiable core [2020-07-20 11:56:00,855 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:56:04,237 INFO L134 CoverageAnalysis]: Checked inductivity of 6160 backedges. 2520 proven. 1260 refuted. 0 times theorem prover too weak. 2380 trivial. 0 not checked. [2020-07-20 11:56:04,237 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:56:08,217 INFO L134 CoverageAnalysis]: Checked inductivity of 6160 backedges. 2520 proven. 1260 refuted. 0 times theorem prover too weak. 2380 trivial. 0 not checked. [2020-07-20 11:56:08,218 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [889623577] [2020-07-20 11:56:08,218 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:56:08,218 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [74, 74] total 110 [2020-07-20 11:56:08,218 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [995528255] [2020-07-20 11:56:08,219 INFO L459 AbstractCegarLoop]: Interpolant automaton has 110 states [2020-07-20 11:56:08,219 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:56:08,219 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 110 interpolants. [2020-07-20 11:56:08,220 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2773, Invalid=9217, Unknown=0, NotChecked=0, Total=11990 [2020-07-20 11:56:08,220 INFO L87 Difference]: Start difference. First operand 302 states and 322 transitions. Second operand 110 states. [2020-07-20 11:56:13,131 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:56:13,132 INFO L93 Difference]: Finished difference Result 599 states and 727 transitions. [2020-07-20 11:56:13,132 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 74 states. [2020-07-20 11:56:13,132 INFO L78 Accepts]: Start accepts. Automaton has 110 states. Word has length 367 [2020-07-20 11:56:13,133 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:56:13,134 INFO L225 Difference]: With dead ends: 599 [2020-07-20 11:56:13,135 INFO L226 Difference]: Without dead ends: 448 [2020-07-20 11:56:13,136 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 769 GetRequests, 589 SyntacticMatches, 36 SemanticMatches, 144 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5635 ImplicationChecksByTransitivity, 8.9s TimeCoverageRelationStatistics Valid=5473, Invalid=15697, Unknown=0, NotChecked=0, Total=21170 [2020-07-20 11:56:13,137 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 448 states. [2020-07-20 11:56:13,151 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 448 to 304. [2020-07-20 11:56:13,151 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 304 states. [2020-07-20 11:56:13,152 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 304 states to 304 states and 324 transitions. [2020-07-20 11:56:13,152 INFO L78 Accepts]: Start accepts. Automaton has 304 states and 324 transitions. Word has length 367 [2020-07-20 11:56:13,152 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:56:13,152 INFO L479 AbstractCegarLoop]: Abstraction has 304 states and 324 transitions. [2020-07-20 11:56:13,152 INFO L480 AbstractCegarLoop]: Interpolant automaton has 110 states. [2020-07-20 11:56:13,152 INFO L276 IsEmpty]: Start isEmpty. Operand 304 states and 324 transitions. [2020-07-20 11:56:13,154 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 370 [2020-07-20 11:56:13,155 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:56:13,155 INFO L422 BasicCegarLoop]: trace histogram [37, 36, 36, 36, 36, 35, 35, 35, 35, 35, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:56:13,369 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 56 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:56:13,370 INFO L427 AbstractCegarLoop]: === Iteration 56 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:56:13,370 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:56:13,370 INFO L82 PathProgramCache]: Analyzing trace with hash 1227173062, now seen corresponding path program 53 times [2020-07-20 11:56:13,371 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:56:13,371 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [95546223] [2020-07-20 11:56:13,371 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 57 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 57 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:56:13,514 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:56:13,518 INFO L263 TraceCheckSpWp]: Trace formula consists of 998 conjuncts, 75 conjunts are in the unsatisfiable core [2020-07-20 11:56:13,521 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:56:14,642 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 11:56:14,787 INFO L134 CoverageAnalysis]: Checked inductivity of 6232 backedges. 1402 proven. 2450 refuted. 0 times theorem prover too weak. 2380 trivial. 0 not checked. [2020-07-20 11:56:14,787 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:56:14,852 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:56:17,120 INFO L134 CoverageAnalysis]: Checked inductivity of 6232 backedges. 1402 proven. 2450 refuted. 0 times theorem prover too weak. 2380 trivial. 0 not checked. [2020-07-20 11:56:17,120 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [95546223] [2020-07-20 11:56:17,120 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:56:17,121 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [41, 41] total 42 [2020-07-20 11:56:17,121 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1274769395] [2020-07-20 11:56:17,121 INFO L459 AbstractCegarLoop]: Interpolant automaton has 42 states [2020-07-20 11:56:17,121 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:56:17,122 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2020-07-20 11:56:17,122 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=784, Invalid=938, Unknown=0, NotChecked=0, Total=1722 [2020-07-20 11:56:17,122 INFO L87 Difference]: Start difference. First operand 304 states and 324 transitions. Second operand 42 states. [2020-07-20 11:56:17,733 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:56:17,733 INFO L93 Difference]: Finished difference Result 323 states and 345 transitions. [2020-07-20 11:56:17,734 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2020-07-20 11:56:17,735 INFO L78 Accepts]: Start accepts. Automaton has 42 states. Word has length 369 [2020-07-20 11:56:17,735 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:56:17,737 INFO L225 Difference]: With dead ends: 323 [2020-07-20 11:56:17,737 INFO L226 Difference]: Without dead ends: 321 [2020-07-20 11:56:17,738 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 738 GetRequests, 625 SyntacticMatches, 72 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1547 ImplicationChecksByTransitivity, 3.1s TimeCoverageRelationStatistics Valid=788, Invalid=1018, Unknown=0, NotChecked=0, Total=1806 [2020-07-20 11:56:17,738 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 321 states. [2020-07-20 11:56:17,747 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 321 to 316. [2020-07-20 11:56:17,747 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 316 states. [2020-07-20 11:56:17,748 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 316 states to 316 states and 337 transitions. [2020-07-20 11:56:17,748 INFO L78 Accepts]: Start accepts. Automaton has 316 states and 337 transitions. Word has length 369 [2020-07-20 11:56:17,749 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:56:17,749 INFO L479 AbstractCegarLoop]: Abstraction has 316 states and 337 transitions. [2020-07-20 11:56:17,749 INFO L480 AbstractCegarLoop]: Interpolant automaton has 42 states. [2020-07-20 11:56:17,749 INFO L276 IsEmpty]: Start isEmpty. Operand 316 states and 337 transitions. [2020-07-20 11:56:17,751 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 386 [2020-07-20 11:56:17,751 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:56:17,751 INFO L422 BasicCegarLoop]: trace histogram [38, 38, 38, 37, 37, 37, 37, 37, 37, 36, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:56:17,951 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 57 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:56:17,952 INFO L427 AbstractCegarLoop]: === Iteration 57 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:56:17,952 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:56:17,952 INFO L82 PathProgramCache]: Analyzing trace with hash 1586365096, now seen corresponding path program 54 times [2020-07-20 11:56:17,953 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:56:17,953 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1360675579] [2020-07-20 11:56:17,953 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 58 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 58 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:56:18,097 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:56:18,101 INFO L263 TraceCheckSpWp]: Trace formula consists of 1032 conjuncts, 76 conjunts are in the unsatisfiable core [2020-07-20 11:56:18,105 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:56:21,756 INFO L134 CoverageAnalysis]: Checked inductivity of 6808 backedges. 2952 proven. 1332 refuted. 0 times theorem prover too weak. 2524 trivial. 0 not checked. [2020-07-20 11:56:21,756 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:56:26,094 INFO L134 CoverageAnalysis]: Checked inductivity of 6808 backedges. 2810 proven. 1332 refuted. 0 times theorem prover too weak. 2666 trivial. 0 not checked. [2020-07-20 11:56:26,095 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1360675579] [2020-07-20 11:56:26,095 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:56:26,095 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [76, 76] total 113 [2020-07-20 11:56:26,095 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [182315291] [2020-07-20 11:56:26,096 INFO L459 AbstractCegarLoop]: Interpolant automaton has 113 states [2020-07-20 11:56:26,096 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:56:26,096 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 113 interpolants. [2020-07-20 11:56:26,097 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2924, Invalid=9732, Unknown=0, NotChecked=0, Total=12656 [2020-07-20 11:56:26,097 INFO L87 Difference]: Start difference. First operand 316 states and 337 transitions. Second operand 113 states. [2020-07-20 11:56:30,844 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:56:30,844 INFO L93 Difference]: Finished difference Result 627 states and 759 transitions. [2020-07-20 11:56:30,844 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 76 states. [2020-07-20 11:56:30,844 INFO L78 Accepts]: Start accepts. Automaton has 113 states. Word has length 385 [2020-07-20 11:56:30,845 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:56:30,846 INFO L225 Difference]: With dead ends: 627 [2020-07-20 11:56:30,847 INFO L226 Difference]: Without dead ends: 466 [2020-07-20 11:56:30,848 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 806 GetRequests, 621 SyntacticMatches, 37 SemanticMatches, 148 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5958 ImplicationChecksByTransitivity, 9.6s TimeCoverageRelationStatistics Valid=5773, Invalid=16577, Unknown=0, NotChecked=0, Total=22350 [2020-07-20 11:56:30,849 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 466 states. [2020-07-20 11:56:30,858 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 466 to 318. [2020-07-20 11:56:30,858 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 318 states. [2020-07-20 11:56:30,858 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 318 states to 318 states and 339 transitions. [2020-07-20 11:56:30,859 INFO L78 Accepts]: Start accepts. Automaton has 318 states and 339 transitions. Word has length 385 [2020-07-20 11:56:30,859 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:56:30,859 INFO L479 AbstractCegarLoop]: Abstraction has 318 states and 339 transitions. [2020-07-20 11:56:30,859 INFO L480 AbstractCegarLoop]: Interpolant automaton has 113 states. [2020-07-20 11:56:30,859 INFO L276 IsEmpty]: Start isEmpty. Operand 318 states and 339 transitions. [2020-07-20 11:56:30,860 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 388 [2020-07-20 11:56:30,860 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:56:30,861 INFO L422 BasicCegarLoop]: trace histogram [38, 38, 38, 38, 37, 37, 37, 37, 37, 37, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:56:31,061 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 58 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:56:31,062 INFO L427 AbstractCegarLoop]: === Iteration 58 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:56:31,062 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:56:31,062 INFO L82 PathProgramCache]: Analyzing trace with hash -468415411, now seen corresponding path program 55 times [2020-07-20 11:56:31,063 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:56:31,063 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [991577856] [2020-07-20 11:56:31,063 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 59 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 59 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:56:31,211 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:56:31,214 INFO L263 TraceCheckSpWp]: Trace formula consists of 1042 conjuncts, 78 conjunts are in the unsatisfiable core [2020-07-20 11:56:31,218 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:56:35,170 INFO L134 CoverageAnalysis]: Checked inductivity of 6882 backedges. 2812 proven. 1406 refuted. 0 times theorem prover too weak. 2664 trivial. 0 not checked. [2020-07-20 11:56:35,170 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:56:39,837 INFO L134 CoverageAnalysis]: Checked inductivity of 6882 backedges. 2812 proven. 1406 refuted. 0 times theorem prover too weak. 2664 trivial. 0 not checked. [2020-07-20 11:56:39,837 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [991577856] [2020-07-20 11:56:39,838 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:56:39,838 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [78, 78] total 116 [2020-07-20 11:56:39,838 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [875362447] [2020-07-20 11:56:39,839 INFO L459 AbstractCegarLoop]: Interpolant automaton has 116 states [2020-07-20 11:56:39,839 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:56:39,840 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 116 interpolants. [2020-07-20 11:56:39,840 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3079, Invalid=10261, Unknown=0, NotChecked=0, Total=13340 [2020-07-20 11:56:39,841 INFO L87 Difference]: Start difference. First operand 318 states and 339 transitions. Second operand 116 states. [2020-07-20 11:56:44,922 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:56:44,922 INFO L93 Difference]: Finished difference Result 631 states and 766 transitions. [2020-07-20 11:56:44,923 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 78 states. [2020-07-20 11:56:44,923 INFO L78 Accepts]: Start accepts. Automaton has 116 states. Word has length 387 [2020-07-20 11:56:44,923 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:56:44,925 INFO L225 Difference]: With dead ends: 631 [2020-07-20 11:56:44,925 INFO L226 Difference]: Without dead ends: 472 [2020-07-20 11:56:44,926 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 811 GetRequests, 621 SyntacticMatches, 38 SemanticMatches, 152 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6290 ImplicationChecksByTransitivity, 10.4s TimeCoverageRelationStatistics Valid=6081, Invalid=17481, Unknown=0, NotChecked=0, Total=23562 [2020-07-20 11:56:44,928 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 472 states. [2020-07-20 11:56:44,943 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 472 to 320. [2020-07-20 11:56:44,943 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 320 states. [2020-07-20 11:56:44,944 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 320 states to 320 states and 341 transitions. [2020-07-20 11:56:44,944 INFO L78 Accepts]: Start accepts. Automaton has 320 states and 341 transitions. Word has length 387 [2020-07-20 11:56:44,944 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:56:44,944 INFO L479 AbstractCegarLoop]: Abstraction has 320 states and 341 transitions. [2020-07-20 11:56:44,945 INFO L480 AbstractCegarLoop]: Interpolant automaton has 116 states. [2020-07-20 11:56:44,945 INFO L276 IsEmpty]: Start isEmpty. Operand 320 states and 341 transitions. [2020-07-20 11:56:44,947 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 390 [2020-07-20 11:56:44,947 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:56:44,947 INFO L422 BasicCegarLoop]: trace histogram [39, 38, 38, 38, 38, 37, 37, 37, 37, 37, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:56:45,148 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 59 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:56:45,149 INFO L427 AbstractCegarLoop]: === Iteration 59 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:56:45,149 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:56:45,150 INFO L82 PathProgramCache]: Analyzing trace with hash 572473522, now seen corresponding path program 56 times [2020-07-20 11:56:45,150 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:56:45,150 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [574248869] [2020-07-20 11:56:45,151 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 60 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 60 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:56:45,304 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:56:45,308 INFO L263 TraceCheckSpWp]: Trace formula consists of 1052 conjuncts, 79 conjunts are in the unsatisfiable core [2020-07-20 11:56:45,312 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:56:46,618 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 11:56:46,781 INFO L134 CoverageAnalysis]: Checked inductivity of 6958 backedges. 1556 proven. 2738 refuted. 0 times theorem prover too weak. 2664 trivial. 0 not checked. [2020-07-20 11:56:46,781 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:56:46,852 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:56:49,516 INFO L134 CoverageAnalysis]: Checked inductivity of 6958 backedges. 1556 proven. 2738 refuted. 0 times theorem prover too weak. 2664 trivial. 0 not checked. [2020-07-20 11:56:49,516 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [574248869] [2020-07-20 11:56:49,516 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:56:49,517 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [43, 43] total 44 [2020-07-20 11:56:49,517 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [452709829] [2020-07-20 11:56:49,517 INFO L459 AbstractCegarLoop]: Interpolant automaton has 44 states [2020-07-20 11:56:49,517 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:56:49,518 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2020-07-20 11:56:49,518 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=865, Invalid=1027, Unknown=0, NotChecked=0, Total=1892 [2020-07-20 11:56:49,518 INFO L87 Difference]: Start difference. First operand 320 states and 341 transitions. Second operand 44 states. [2020-07-20 11:56:50,258 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:56:50,258 INFO L93 Difference]: Finished difference Result 339 states and 362 transitions. [2020-07-20 11:56:50,259 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2020-07-20 11:56:50,259 INFO L78 Accepts]: Start accepts. Automaton has 44 states. Word has length 389 [2020-07-20 11:56:50,260 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:56:50,261 INFO L225 Difference]: With dead ends: 339 [2020-07-20 11:56:50,261 INFO L226 Difference]: Without dead ends: 337 [2020-07-20 11:56:50,262 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 778 GetRequests, 659 SyntacticMatches, 76 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1709 ImplicationChecksByTransitivity, 3.7s TimeCoverageRelationStatistics Valid=869, Invalid=1111, Unknown=0, NotChecked=0, Total=1980 [2020-07-20 11:56:50,262 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 337 states. [2020-07-20 11:56:50,277 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 337 to 332. [2020-07-20 11:56:50,277 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 332 states. [2020-07-20 11:56:50,278 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 332 states to 332 states and 354 transitions. [2020-07-20 11:56:50,278 INFO L78 Accepts]: Start accepts. Automaton has 332 states and 354 transitions. Word has length 389 [2020-07-20 11:56:50,279 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:56:50,279 INFO L479 AbstractCegarLoop]: Abstraction has 332 states and 354 transitions. [2020-07-20 11:56:50,279 INFO L480 AbstractCegarLoop]: Interpolant automaton has 44 states. [2020-07-20 11:56:50,279 INFO L276 IsEmpty]: Start isEmpty. Operand 332 states and 354 transitions. [2020-07-20 11:56:50,281 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 406 [2020-07-20 11:56:50,281 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:56:50,282 INFO L422 BasicCegarLoop]: trace histogram [40, 40, 40, 39, 39, 39, 39, 39, 39, 38, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:56:50,496 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 60 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:56:50,497 INFO L427 AbstractCegarLoop]: === Iteration 60 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:56:50,497 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:56:50,497 INFO L82 PathProgramCache]: Analyzing trace with hash -73744748, now seen corresponding path program 57 times [2020-07-20 11:56:50,497 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:56:50,498 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [365418916] [2020-07-20 11:56:50,498 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 61 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 61 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:56:50,646 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:56:50,651 INFO L263 TraceCheckSpWp]: Trace formula consists of 1086 conjuncts, 80 conjunts are in the unsatisfiable core [2020-07-20 11:56:50,655 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:56:55,053 INFO L134 CoverageAnalysis]: Checked inductivity of 7566 backedges. 3268 proven. 1482 refuted. 0 times theorem prover too weak. 2816 trivial. 0 not checked. [2020-07-20 11:56:55,053 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:57:00,173 INFO L134 CoverageAnalysis]: Checked inductivity of 7566 backedges. 3118 proven. 1482 refuted. 0 times theorem prover too weak. 2966 trivial. 0 not checked. [2020-07-20 11:57:00,173 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [365418916] [2020-07-20 11:57:00,174 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:57:00,174 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [80, 80] total 119 [2020-07-20 11:57:00,174 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [186792437] [2020-07-20 11:57:00,174 INFO L459 AbstractCegarLoop]: Interpolant automaton has 119 states [2020-07-20 11:57:00,175 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:57:00,175 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 119 interpolants. [2020-07-20 11:57:00,176 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3238, Invalid=10804, Unknown=0, NotChecked=0, Total=14042 [2020-07-20 11:57:00,176 INFO L87 Difference]: Start difference. First operand 332 states and 354 transitions. Second operand 119 states. [2020-07-20 11:57:05,963 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:57:05,963 INFO L93 Difference]: Finished difference Result 659 states and 798 transitions. [2020-07-20 11:57:05,963 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 80 states. [2020-07-20 11:57:05,963 INFO L78 Accepts]: Start accepts. Automaton has 119 states. Word has length 405 [2020-07-20 11:57:05,964 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:57:05,965 INFO L225 Difference]: With dead ends: 659 [2020-07-20 11:57:05,965 INFO L226 Difference]: Without dead ends: 490 [2020-07-20 11:57:05,967 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 848 GetRequests, 653 SyntacticMatches, 39 SemanticMatches, 156 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6631 ImplicationChecksByTransitivity, 11.4s TimeCoverageRelationStatistics Valid=6397, Invalid=18409, Unknown=0, NotChecked=0, Total=24806 [2020-07-20 11:57:05,967 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 490 states. [2020-07-20 11:57:05,978 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 490 to 334. [2020-07-20 11:57:05,978 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 334 states. [2020-07-20 11:57:05,979 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 334 states to 334 states and 356 transitions. [2020-07-20 11:57:05,979 INFO L78 Accepts]: Start accepts. Automaton has 334 states and 356 transitions. Word has length 405 [2020-07-20 11:57:05,979 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:57:05,979 INFO L479 AbstractCegarLoop]: Abstraction has 334 states and 356 transitions. [2020-07-20 11:57:05,979 INFO L480 AbstractCegarLoop]: Interpolant automaton has 119 states. [2020-07-20 11:57:05,980 INFO L276 IsEmpty]: Start isEmpty. Operand 334 states and 356 transitions. [2020-07-20 11:57:05,981 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 408 [2020-07-20 11:57:05,981 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:57:05,981 INFO L422 BasicCegarLoop]: trace histogram [40, 40, 40, 40, 39, 39, 39, 39, 39, 39, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:57:06,182 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 61 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:57:06,182 INFO L427 AbstractCegarLoop]: === Iteration 61 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:57:06,183 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:57:06,183 INFO L82 PathProgramCache]: Analyzing trace with hash 2082014137, now seen corresponding path program 58 times [2020-07-20 11:57:06,184 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:57:06,184 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1019358481] [2020-07-20 11:57:06,184 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 62 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 62 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:57:06,335 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:57:06,338 INFO L263 TraceCheckSpWp]: Trace formula consists of 1096 conjuncts, 82 conjunts are in the unsatisfiable core [2020-07-20 11:57:06,343 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:57:10,994 INFO L134 CoverageAnalysis]: Checked inductivity of 7644 backedges. 3120 proven. 1560 refuted. 0 times theorem prover too weak. 2964 trivial. 0 not checked. [2020-07-20 11:57:10,995 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:57:16,535 INFO L134 CoverageAnalysis]: Checked inductivity of 7644 backedges. 3120 proven. 1560 refuted. 0 times theorem prover too weak. 2964 trivial. 0 not checked. [2020-07-20 11:57:16,535 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1019358481] [2020-07-20 11:57:16,535 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:57:16,535 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [82, 82] total 122 [2020-07-20 11:57:16,536 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [897860083] [2020-07-20 11:57:16,536 INFO L459 AbstractCegarLoop]: Interpolant automaton has 122 states [2020-07-20 11:57:16,536 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:57:16,537 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 122 interpolants. [2020-07-20 11:57:16,537 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3401, Invalid=11361, Unknown=0, NotChecked=0, Total=14762 [2020-07-20 11:57:16,537 INFO L87 Difference]: Start difference. First operand 334 states and 356 transitions. Second operand 122 states. [2020-07-20 11:57:22,556 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:57:22,556 INFO L93 Difference]: Finished difference Result 663 states and 805 transitions. [2020-07-20 11:57:22,556 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 82 states. [2020-07-20 11:57:22,556 INFO L78 Accepts]: Start accepts. Automaton has 122 states. Word has length 407 [2020-07-20 11:57:22,557 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:57:22,558 INFO L225 Difference]: With dead ends: 663 [2020-07-20 11:57:22,559 INFO L226 Difference]: Without dead ends: 496 [2020-07-20 11:57:22,561 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 853 GetRequests, 653 SyntacticMatches, 40 SemanticMatches, 160 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6981 ImplicationChecksByTransitivity, 12.3s TimeCoverageRelationStatistics Valid=6721, Invalid=19361, Unknown=0, NotChecked=0, Total=26082 [2020-07-20 11:57:22,561 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 496 states. [2020-07-20 11:57:22,576 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 496 to 336. [2020-07-20 11:57:22,577 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 336 states. [2020-07-20 11:57:22,578 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 336 states to 336 states and 358 transitions. [2020-07-20 11:57:22,578 INFO L78 Accepts]: Start accepts. Automaton has 336 states and 358 transitions. Word has length 407 [2020-07-20 11:57:22,578 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:57:22,578 INFO L479 AbstractCegarLoop]: Abstraction has 336 states and 358 transitions. [2020-07-20 11:57:22,578 INFO L480 AbstractCegarLoop]: Interpolant automaton has 122 states. [2020-07-20 11:57:22,578 INFO L276 IsEmpty]: Start isEmpty. Operand 336 states and 358 transitions. [2020-07-20 11:57:22,580 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 410 [2020-07-20 11:57:22,581 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:57:22,581 INFO L422 BasicCegarLoop]: trace histogram [41, 40, 40, 40, 40, 39, 39, 39, 39, 39, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:57:22,794 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 62 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:57:22,795 INFO L427 AbstractCegarLoop]: === Iteration 62 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:57:22,795 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:57:22,796 INFO L82 PathProgramCache]: Analyzing trace with hash -702901346, now seen corresponding path program 59 times [2020-07-20 11:57:22,796 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:57:22,796 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1083142945] [2020-07-20 11:57:22,796 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 63 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 63 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:57:22,953 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:57:22,956 INFO L263 TraceCheckSpWp]: Trace formula consists of 1106 conjuncts, 83 conjunts are in the unsatisfiable core [2020-07-20 11:57:22,961 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:57:24,554 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 11:57:24,715 INFO L134 CoverageAnalysis]: Checked inductivity of 7724 backedges. 1718 proven. 3042 refuted. 0 times theorem prover too weak. 2964 trivial. 0 not checked. [2020-07-20 11:57:24,715 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:57:24,795 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:57:28,026 INFO L134 CoverageAnalysis]: Checked inductivity of 7724 backedges. 1718 proven. 3042 refuted. 0 times theorem prover too weak. 2964 trivial. 0 not checked. [2020-07-20 11:57:28,026 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1083142945] [2020-07-20 11:57:28,026 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:57:28,026 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [45, 45] total 46 [2020-07-20 11:57:28,027 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1304795196] [2020-07-20 11:57:28,027 INFO L459 AbstractCegarLoop]: Interpolant automaton has 46 states [2020-07-20 11:57:28,027 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:57:28,027 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2020-07-20 11:57:28,028 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=950, Invalid=1120, Unknown=0, NotChecked=0, Total=2070 [2020-07-20 11:57:28,028 INFO L87 Difference]: Start difference. First operand 336 states and 358 transitions. Second operand 46 states. [2020-07-20 11:57:28,843 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:57:28,843 INFO L93 Difference]: Finished difference Result 355 states and 379 transitions. [2020-07-20 11:57:28,844 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2020-07-20 11:57:28,845 INFO L78 Accepts]: Start accepts. Automaton has 46 states. Word has length 409 [2020-07-20 11:57:28,845 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:57:28,846 INFO L225 Difference]: With dead ends: 355 [2020-07-20 11:57:28,847 INFO L226 Difference]: Without dead ends: 353 [2020-07-20 11:57:28,847 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 818 GetRequests, 693 SyntacticMatches, 80 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1879 ImplicationChecksByTransitivity, 4.5s TimeCoverageRelationStatistics Valid=954, Invalid=1208, Unknown=0, NotChecked=0, Total=2162 [2020-07-20 11:57:28,848 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 353 states. [2020-07-20 11:57:28,863 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 353 to 348. [2020-07-20 11:57:28,863 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 348 states. [2020-07-20 11:57:28,864 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 348 states to 348 states and 371 transitions. [2020-07-20 11:57:28,864 INFO L78 Accepts]: Start accepts. Automaton has 348 states and 371 transitions. Word has length 409 [2020-07-20 11:57:28,865 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:57:28,865 INFO L479 AbstractCegarLoop]: Abstraction has 348 states and 371 transitions. [2020-07-20 11:57:28,865 INFO L480 AbstractCegarLoop]: Interpolant automaton has 46 states. [2020-07-20 11:57:28,865 INFO L276 IsEmpty]: Start isEmpty. Operand 348 states and 371 transitions. [2020-07-20 11:57:28,867 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 426 [2020-07-20 11:57:28,868 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:57:28,868 INFO L422 BasicCegarLoop]: trace histogram [42, 42, 42, 41, 41, 41, 41, 41, 41, 40, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:57:29,068 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 63 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:57:29,069 INFO L427 AbstractCegarLoop]: === Iteration 63 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:57:29,069 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:57:29,069 INFO L82 PathProgramCache]: Analyzing trace with hash 524990848, now seen corresponding path program 60 times [2020-07-20 11:57:29,070 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:57:29,070 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [70871065] [2020-07-20 11:57:29,070 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 64 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 64 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:57:29,230 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:57:29,234 INFO L263 TraceCheckSpWp]: Trace formula consists of 1140 conjuncts, 84 conjunts are in the unsatisfiable core [2020-07-20 11:57:29,238 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:57:34,334 INFO L134 CoverageAnalysis]: Checked inductivity of 8364 backedges. 3600 proven. 1640 refuted. 0 times theorem prover too weak. 3124 trivial. 0 not checked. [2020-07-20 11:57:34,334 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:57:40,482 INFO L134 CoverageAnalysis]: Checked inductivity of 8364 backedges. 3442 proven. 1640 refuted. 0 times theorem prover too weak. 3282 trivial. 0 not checked. [2020-07-20 11:57:40,483 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [70871065] [2020-07-20 11:57:40,483 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:57:40,483 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [84, 84] total 125 [2020-07-20 11:57:40,483 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [979454840] [2020-07-20 11:57:40,484 INFO L459 AbstractCegarLoop]: Interpolant automaton has 125 states [2020-07-20 11:57:40,484 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:57:40,485 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 125 interpolants. [2020-07-20 11:57:40,486 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3568, Invalid=11932, Unknown=0, NotChecked=0, Total=15500 [2020-07-20 11:57:40,486 INFO L87 Difference]: Start difference. First operand 348 states and 371 transitions. Second operand 125 states. [2020-07-20 11:57:47,427 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:57:47,427 INFO L93 Difference]: Finished difference Result 691 states and 837 transitions. [2020-07-20 11:57:47,428 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 84 states. [2020-07-20 11:57:47,428 INFO L78 Accepts]: Start accepts. Automaton has 125 states. Word has length 425 [2020-07-20 11:57:47,428 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:57:47,430 INFO L225 Difference]: With dead ends: 691 [2020-07-20 11:57:47,430 INFO L226 Difference]: Without dead ends: 514 [2020-07-20 11:57:47,432 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 890 GetRequests, 685 SyntacticMatches, 41 SemanticMatches, 164 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7340 ImplicationChecksByTransitivity, 13.6s TimeCoverageRelationStatistics Valid=7053, Invalid=20337, Unknown=0, NotChecked=0, Total=27390 [2020-07-20 11:57:47,432 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 514 states. [2020-07-20 11:57:47,443 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 514 to 350. [2020-07-20 11:57:47,444 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 350 states. [2020-07-20 11:57:47,444 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 350 states to 350 states and 373 transitions. [2020-07-20 11:57:47,444 INFO L78 Accepts]: Start accepts. Automaton has 350 states and 373 transitions. Word has length 425 [2020-07-20 11:57:47,444 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:57:47,444 INFO L479 AbstractCegarLoop]: Abstraction has 350 states and 373 transitions. [2020-07-20 11:57:47,445 INFO L480 AbstractCegarLoop]: Interpolant automaton has 125 states. [2020-07-20 11:57:47,445 INFO L276 IsEmpty]: Start isEmpty. Operand 350 states and 373 transitions. [2020-07-20 11:57:47,446 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 428 [2020-07-20 11:57:47,446 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:57:47,447 INFO L422 BasicCegarLoop]: trace histogram [42, 42, 42, 42, 41, 41, 41, 41, 41, 41, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:57:47,647 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 64 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:57:47,648 INFO L427 AbstractCegarLoop]: === Iteration 64 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:57:47,648 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:57:47,649 INFO L82 PathProgramCache]: Analyzing trace with hash -2129659355, now seen corresponding path program 61 times [2020-07-20 11:57:47,649 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:57:47,649 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [537419246] [2020-07-20 11:57:47,649 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 65 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 65 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:57:47,810 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:57:47,813 INFO L263 TraceCheckSpWp]: Trace formula consists of 1150 conjuncts, 86 conjunts are in the unsatisfiable core [2020-07-20 11:57:47,818 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:57:53,402 INFO L134 CoverageAnalysis]: Checked inductivity of 8446 backedges. 3444 proven. 1722 refuted. 0 times theorem prover too weak. 3280 trivial. 0 not checked. [2020-07-20 11:57:53,403 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:58:00,095 INFO L134 CoverageAnalysis]: Checked inductivity of 8446 backedges. 3444 proven. 1722 refuted. 0 times theorem prover too weak. 3280 trivial. 0 not checked. [2020-07-20 11:58:00,096 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [537419246] [2020-07-20 11:58:00,096 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:58:00,096 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [86, 86] total 128 [2020-07-20 11:58:00,096 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [741265958] [2020-07-20 11:58:00,097 INFO L459 AbstractCegarLoop]: Interpolant automaton has 128 states [2020-07-20 11:58:00,097 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:58:00,098 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 128 interpolants. [2020-07-20 11:58:00,098 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3739, Invalid=12517, Unknown=0, NotChecked=0, Total=16256 [2020-07-20 11:58:00,098 INFO L87 Difference]: Start difference. First operand 350 states and 373 transitions. Second operand 128 states. [2020-07-20 11:58:07,457 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:58:07,458 INFO L93 Difference]: Finished difference Result 695 states and 844 transitions. [2020-07-20 11:58:07,458 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 86 states. [2020-07-20 11:58:07,458 INFO L78 Accepts]: Start accepts. Automaton has 128 states. Word has length 427 [2020-07-20 11:58:07,459 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:58:07,461 INFO L225 Difference]: With dead ends: 695 [2020-07-20 11:58:07,461 INFO L226 Difference]: Without dead ends: 520 [2020-07-20 11:58:07,463 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 895 GetRequests, 685 SyntacticMatches, 42 SemanticMatches, 168 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7708 ImplicationChecksByTransitivity, 14.9s TimeCoverageRelationStatistics Valid=7393, Invalid=21337, Unknown=0, NotChecked=0, Total=28730 [2020-07-20 11:58:07,464 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 520 states. [2020-07-20 11:58:07,475 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 520 to 352. [2020-07-20 11:58:07,476 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 352 states. [2020-07-20 11:58:07,476 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 352 states to 352 states and 375 transitions. [2020-07-20 11:58:07,477 INFO L78 Accepts]: Start accepts. Automaton has 352 states and 375 transitions. Word has length 427 [2020-07-20 11:58:07,477 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:58:07,477 INFO L479 AbstractCegarLoop]: Abstraction has 352 states and 375 transitions. [2020-07-20 11:58:07,477 INFO L480 AbstractCegarLoop]: Interpolant automaton has 128 states. [2020-07-20 11:58:07,477 INFO L276 IsEmpty]: Start isEmpty. Operand 352 states and 375 transitions. [2020-07-20 11:58:07,480 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 430 [2020-07-20 11:58:07,480 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:58:07,480 INFO L422 BasicCegarLoop]: trace histogram [43, 42, 42, 42, 42, 41, 41, 41, 41, 41, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:58:07,694 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 65 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:58:07,695 INFO L427 AbstractCegarLoop]: === Iteration 65 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:58:07,695 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:58:07,696 INFO L82 PathProgramCache]: Analyzing trace with hash -2037930614, now seen corresponding path program 62 times [2020-07-20 11:58:07,696 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:58:07,696 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1442312658] [2020-07-20 11:58:07,696 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 66 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 66 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:58:07,865 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:58:07,869 INFO L263 TraceCheckSpWp]: Trace formula consists of 1160 conjuncts, 87 conjunts are in the unsatisfiable core [2020-07-20 11:58:07,873 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:58:09,741 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 11:58:09,934 INFO L134 CoverageAnalysis]: Checked inductivity of 8530 backedges. 1888 proven. 3362 refuted. 0 times theorem prover too weak. 3280 trivial. 0 not checked. [2020-07-20 11:58:09,934 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:58:10,027 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:58:13,799 INFO L134 CoverageAnalysis]: Checked inductivity of 8530 backedges. 1888 proven. 3362 refuted. 0 times theorem prover too weak. 3280 trivial. 0 not checked. [2020-07-20 11:58:13,799 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1442312658] [2020-07-20 11:58:13,799 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:58:13,800 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [47, 47] total 48 [2020-07-20 11:58:13,800 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1009088882] [2020-07-20 11:58:13,800 INFO L459 AbstractCegarLoop]: Interpolant automaton has 48 states [2020-07-20 11:58:13,800 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:58:13,801 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2020-07-20 11:58:13,801 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1039, Invalid=1217, Unknown=0, NotChecked=0, Total=2256 [2020-07-20 11:58:13,801 INFO L87 Difference]: Start difference. First operand 352 states and 375 transitions. Second operand 48 states. [2020-07-20 11:58:14,720 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:58:14,720 INFO L93 Difference]: Finished difference Result 371 states and 396 transitions. [2020-07-20 11:58:14,722 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2020-07-20 11:58:14,722 INFO L78 Accepts]: Start accepts. Automaton has 48 states. Word has length 429 [2020-07-20 11:58:14,722 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:58:14,724 INFO L225 Difference]: With dead ends: 371 [2020-07-20 11:58:14,725 INFO L226 Difference]: Without dead ends: 369 [2020-07-20 11:58:14,725 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 858 GetRequests, 727 SyntacticMatches, 84 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2057 ImplicationChecksByTransitivity, 5.3s TimeCoverageRelationStatistics Valid=1043, Invalid=1309, Unknown=0, NotChecked=0, Total=2352 [2020-07-20 11:58:14,726 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 369 states. [2020-07-20 11:58:14,753 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 369 to 364. [2020-07-20 11:58:14,753 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 364 states. [2020-07-20 11:58:14,754 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 364 states to 364 states and 388 transitions. [2020-07-20 11:58:14,755 INFO L78 Accepts]: Start accepts. Automaton has 364 states and 388 transitions. Word has length 429 [2020-07-20 11:58:14,755 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:58:14,755 INFO L479 AbstractCegarLoop]: Abstraction has 364 states and 388 transitions. [2020-07-20 11:58:14,755 INFO L480 AbstractCegarLoop]: Interpolant automaton has 48 states. [2020-07-20 11:58:14,756 INFO L276 IsEmpty]: Start isEmpty. Operand 364 states and 388 transitions. [2020-07-20 11:58:14,758 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 446 [2020-07-20 11:58:14,758 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:58:14,758 INFO L422 BasicCegarLoop]: trace histogram [44, 44, 44, 43, 43, 43, 43, 43, 43, 42, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:58:14,963 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 66 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:58:14,964 INFO L427 AbstractCegarLoop]: === Iteration 66 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:58:14,964 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:58:14,964 INFO L82 PathProgramCache]: Analyzing trace with hash -99716244, now seen corresponding path program 63 times [2020-07-20 11:58:14,965 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:58:14,965 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1943687867] [2020-07-20 11:58:14,966 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 67 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 67 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:58:15,125 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:58:15,128 INFO L263 TraceCheckSpWp]: Trace formula consists of 1194 conjuncts, 88 conjunts are in the unsatisfiable core [2020-07-20 11:58:15,132 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:58:21,130 INFO L134 CoverageAnalysis]: Checked inductivity of 9202 backedges. 3948 proven. 1806 refuted. 0 times theorem prover too weak. 3448 trivial. 0 not checked. [2020-07-20 11:58:21,130 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:58:28,453 INFO L134 CoverageAnalysis]: Checked inductivity of 9202 backedges. 3782 proven. 1806 refuted. 0 times theorem prover too weak. 3614 trivial. 0 not checked. [2020-07-20 11:58:28,454 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1943687867] [2020-07-20 11:58:28,454 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:58:28,455 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [88, 88] total 131 [2020-07-20 11:58:28,455 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1920466875] [2020-07-20 11:58:28,456 INFO L459 AbstractCegarLoop]: Interpolant automaton has 131 states [2020-07-20 11:58:28,456 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:58:28,457 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 131 interpolants. [2020-07-20 11:58:28,457 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3914, Invalid=13116, Unknown=0, NotChecked=0, Total=17030 [2020-07-20 11:58:28,458 INFO L87 Difference]: Start difference. First operand 364 states and 388 transitions. Second operand 131 states. [2020-07-20 11:58:36,241 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:58:36,241 INFO L93 Difference]: Finished difference Result 723 states and 876 transitions. [2020-07-20 11:58:36,241 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 88 states. [2020-07-20 11:58:36,241 INFO L78 Accepts]: Start accepts. Automaton has 131 states. Word has length 445 [2020-07-20 11:58:36,241 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:58:36,243 INFO L225 Difference]: With dead ends: 723 [2020-07-20 11:58:36,243 INFO L226 Difference]: Without dead ends: 538 [2020-07-20 11:58:36,246 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 932 GetRequests, 717 SyntacticMatches, 43 SemanticMatches, 172 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8085 ImplicationChecksByTransitivity, 16.2s TimeCoverageRelationStatistics Valid=7741, Invalid=22361, Unknown=0, NotChecked=0, Total=30102 [2020-07-20 11:58:36,246 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 538 states. [2020-07-20 11:58:36,261 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 538 to 366. [2020-07-20 11:58:36,261 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 366 states. [2020-07-20 11:58:36,262 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 366 states to 366 states and 390 transitions. [2020-07-20 11:58:36,262 INFO L78 Accepts]: Start accepts. Automaton has 366 states and 390 transitions. Word has length 445 [2020-07-20 11:58:36,262 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:58:36,262 INFO L479 AbstractCegarLoop]: Abstraction has 366 states and 390 transitions. [2020-07-20 11:58:36,262 INFO L480 AbstractCegarLoop]: Interpolant automaton has 131 states. [2020-07-20 11:58:36,262 INFO L276 IsEmpty]: Start isEmpty. Operand 366 states and 390 transitions. [2020-07-20 11:58:36,264 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 448 [2020-07-20 11:58:36,264 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:58:36,264 INFO L422 BasicCegarLoop]: trace histogram [44, 44, 44, 44, 43, 43, 43, 43, 43, 43, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:58:36,464 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 67 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:58:36,465 INFO L427 AbstractCegarLoop]: === Iteration 67 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:58:36,465 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:58:36,466 INFO L82 PathProgramCache]: Analyzing trace with hash 592048017, now seen corresponding path program 64 times [2020-07-20 11:58:36,466 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:58:36,466 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [517441762] [2020-07-20 11:58:36,466 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 68 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 68 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:58:36,633 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:58:36,636 INFO L263 TraceCheckSpWp]: Trace formula consists of 1204 conjuncts, 90 conjunts are in the unsatisfiable core [2020-07-20 11:58:36,640 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:58:43,269 INFO L134 CoverageAnalysis]: Checked inductivity of 9288 backedges. 3784 proven. 1892 refuted. 0 times theorem prover too weak. 3612 trivial. 0 not checked. [2020-07-20 11:58:43,269 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:58:51,545 INFO L134 CoverageAnalysis]: Checked inductivity of 9288 backedges. 3784 proven. 1892 refuted. 0 times theorem prover too weak. 3612 trivial. 0 not checked. [2020-07-20 11:58:51,545 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [517441762] [2020-07-20 11:58:51,545 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:58:51,545 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [90, 90] total 134 [2020-07-20 11:58:51,545 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [166932109] [2020-07-20 11:58:51,546 INFO L459 AbstractCegarLoop]: Interpolant automaton has 134 states [2020-07-20 11:58:51,546 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:58:51,547 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 134 interpolants. [2020-07-20 11:58:51,547 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4093, Invalid=13729, Unknown=0, NotChecked=0, Total=17822 [2020-07-20 11:58:51,548 INFO L87 Difference]: Start difference. First operand 366 states and 390 transitions. Second operand 134 states. [2020-07-20 11:59:01,300 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:59:01,300 INFO L93 Difference]: Finished difference Result 727 states and 883 transitions. [2020-07-20 11:59:01,300 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 90 states. [2020-07-20 11:59:01,300 INFO L78 Accepts]: Start accepts. Automaton has 134 states. Word has length 447 [2020-07-20 11:59:01,301 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:59:01,302 INFO L225 Difference]: With dead ends: 727 [2020-07-20 11:59:01,302 INFO L226 Difference]: Without dead ends: 544 [2020-07-20 11:59:01,304 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 937 GetRequests, 717 SyntacticMatches, 44 SemanticMatches, 176 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8471 ImplicationChecksByTransitivity, 18.3s TimeCoverageRelationStatistics Valid=8097, Invalid=23409, Unknown=0, NotChecked=0, Total=31506 [2020-07-20 11:59:01,305 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 544 states. [2020-07-20 11:59:01,321 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 544 to 368. [2020-07-20 11:59:01,321 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 368 states. [2020-07-20 11:59:01,321 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 368 states to 368 states and 392 transitions. [2020-07-20 11:59:01,322 INFO L78 Accepts]: Start accepts. Automaton has 368 states and 392 transitions. Word has length 447 [2020-07-20 11:59:01,322 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:59:01,322 INFO L479 AbstractCegarLoop]: Abstraction has 368 states and 392 transitions. [2020-07-20 11:59:01,322 INFO L480 AbstractCegarLoop]: Interpolant automaton has 134 states. [2020-07-20 11:59:01,322 INFO L276 IsEmpty]: Start isEmpty. Operand 368 states and 392 transitions. [2020-07-20 11:59:01,324 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 450 [2020-07-20 11:59:01,324 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:59:01,324 INFO L422 BasicCegarLoop]: trace histogram [45, 44, 44, 44, 44, 43, 43, 43, 43, 43, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:59:01,524 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 68 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:59:01,525 INFO L427 AbstractCegarLoop]: === Iteration 68 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:59:01,525 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:59:01,526 INFO L82 PathProgramCache]: Analyzing trace with hash -342428042, now seen corresponding path program 65 times [2020-07-20 11:59:01,526 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:59:01,526 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [759816500] [2020-07-20 11:59:01,526 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 69 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 69 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:59:01,705 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:59:01,711 INFO L263 TraceCheckSpWp]: Trace formula consists of 1214 conjuncts, 91 conjunts are in the unsatisfiable core [2020-07-20 11:59:01,716 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:59:04,180 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 11:59:04,387 INFO L134 CoverageAnalysis]: Checked inductivity of 9376 backedges. 2066 proven. 3698 refuted. 0 times theorem prover too weak. 3612 trivial. 0 not checked. [2020-07-20 11:59:04,388 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:59:04,499 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:59:09,510 INFO L134 CoverageAnalysis]: Checked inductivity of 9376 backedges. 2066 proven. 3698 refuted. 0 times theorem prover too weak. 3612 trivial. 0 not checked. [2020-07-20 11:59:09,510 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [759816500] [2020-07-20 11:59:09,510 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:59:09,511 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [49, 49] total 50 [2020-07-20 11:59:09,511 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [711500371] [2020-07-20 11:59:09,511 INFO L459 AbstractCegarLoop]: Interpolant automaton has 50 states [2020-07-20 11:59:09,511 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:59:09,512 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2020-07-20 11:59:09,512 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1132, Invalid=1318, Unknown=0, NotChecked=0, Total=2450 [2020-07-20 11:59:09,512 INFO L87 Difference]: Start difference. First operand 368 states and 392 transitions. Second operand 50 states. [2020-07-20 11:59:10,750 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:59:10,751 INFO L93 Difference]: Finished difference Result 387 states and 413 transitions. [2020-07-20 11:59:10,753 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2020-07-20 11:59:10,753 INFO L78 Accepts]: Start accepts. Automaton has 50 states. Word has length 449 [2020-07-20 11:59:10,754 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:59:10,756 INFO L225 Difference]: With dead ends: 387 [2020-07-20 11:59:10,756 INFO L226 Difference]: Without dead ends: 385 [2020-07-20 11:59:10,756 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 898 GetRequests, 761 SyntacticMatches, 88 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2243 ImplicationChecksByTransitivity, 7.1s TimeCoverageRelationStatistics Valid=1136, Invalid=1414, Unknown=0, NotChecked=0, Total=2550 [2020-07-20 11:59:10,757 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 385 states. [2020-07-20 11:59:10,769 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 385 to 380. [2020-07-20 11:59:10,769 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 380 states. [2020-07-20 11:59:10,770 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 380 states to 380 states and 405 transitions. [2020-07-20 11:59:10,770 INFO L78 Accepts]: Start accepts. Automaton has 380 states and 405 transitions. Word has length 449 [2020-07-20 11:59:10,770 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:59:10,770 INFO L479 AbstractCegarLoop]: Abstraction has 380 states and 405 transitions. [2020-07-20 11:59:10,770 INFO L480 AbstractCegarLoop]: Interpolant automaton has 50 states. [2020-07-20 11:59:10,770 INFO L276 IsEmpty]: Start isEmpty. Operand 380 states and 405 transitions. [2020-07-20 11:59:10,772 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 466 [2020-07-20 11:59:10,772 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:59:10,772 INFO L422 BasicCegarLoop]: trace histogram [46, 46, 46, 45, 45, 45, 45, 45, 45, 44, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:59:10,973 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 69 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:59:10,973 INFO L427 AbstractCegarLoop]: === Iteration 69 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:59:10,974 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:59:10,974 INFO L82 PathProgramCache]: Analyzing trace with hash -753505192, now seen corresponding path program 66 times [2020-07-20 11:59:10,974 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:59:10,975 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1439465222] [2020-07-20 11:59:10,975 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 70 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 70 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:59:11,148 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:59:11,153 INFO L263 TraceCheckSpWp]: Trace formula consists of 1248 conjuncts, 92 conjunts are in the unsatisfiable core [2020-07-20 11:59:11,158 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:59:19,161 INFO L134 CoverageAnalysis]: Checked inductivity of 10080 backedges. 4312 proven. 1980 refuted. 0 times theorem prover too weak. 3788 trivial. 0 not checked. [2020-07-20 11:59:19,161 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:59:28,860 INFO L134 CoverageAnalysis]: Checked inductivity of 10080 backedges. 4138 proven. 1980 refuted. 0 times theorem prover too weak. 3962 trivial. 0 not checked. [2020-07-20 11:59:28,861 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1439465222] [2020-07-20 11:59:28,861 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:59:28,861 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [92, 92] total 137 [2020-07-20 11:59:28,861 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1314491644] [2020-07-20 11:59:28,862 INFO L459 AbstractCegarLoop]: Interpolant automaton has 137 states [2020-07-20 11:59:28,862 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:59:28,862 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 137 interpolants. [2020-07-20 11:59:28,863 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4276, Invalid=14356, Unknown=0, NotChecked=0, Total=18632 [2020-07-20 11:59:28,863 INFO L87 Difference]: Start difference. First operand 380 states and 405 transitions. Second operand 137 states. [2020-07-20 11:59:38,931 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:59:38,931 INFO L93 Difference]: Finished difference Result 755 states and 915 transitions. [2020-07-20 11:59:38,931 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 92 states. [2020-07-20 11:59:38,932 INFO L78 Accepts]: Start accepts. Automaton has 137 states. Word has length 465 [2020-07-20 11:59:38,932 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:59:38,934 INFO L225 Difference]: With dead ends: 755 [2020-07-20 11:59:38,934 INFO L226 Difference]: Without dead ends: 562 [2020-07-20 11:59:38,936 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 974 GetRequests, 749 SyntacticMatches, 45 SemanticMatches, 180 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8866 ImplicationChecksByTransitivity, 21.5s TimeCoverageRelationStatistics Valid=8461, Invalid=24481, Unknown=0, NotChecked=0, Total=32942 [2020-07-20 11:59:38,937 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 562 states. [2020-07-20 11:59:38,949 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 562 to 382. [2020-07-20 11:59:38,949 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 382 states. [2020-07-20 11:59:38,951 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 382 states to 382 states and 407 transitions. [2020-07-20 11:59:38,951 INFO L78 Accepts]: Start accepts. Automaton has 382 states and 407 transitions. Word has length 465 [2020-07-20 11:59:38,951 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:59:38,951 INFO L479 AbstractCegarLoop]: Abstraction has 382 states and 407 transitions. [2020-07-20 11:59:38,951 INFO L480 AbstractCegarLoop]: Interpolant automaton has 137 states. [2020-07-20 11:59:38,951 INFO L276 IsEmpty]: Start isEmpty. Operand 382 states and 407 transitions. [2020-07-20 11:59:38,954 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 468 [2020-07-20 11:59:38,954 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:59:38,955 INFO L422 BasicCegarLoop]: trace histogram [46, 46, 46, 46, 45, 45, 45, 45, 45, 45, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:59:39,167 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 70 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:59:39,168 INFO L427 AbstractCegarLoop]: === Iteration 70 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:59:39,168 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:59:39,169 INFO L82 PathProgramCache]: Analyzing trace with hash -103324675, now seen corresponding path program 67 times [2020-07-20 11:59:39,169 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:59:39,169 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1064470843] [2020-07-20 11:59:39,170 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 71 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 71 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:59:39,346 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:59:39,352 INFO L263 TraceCheckSpWp]: Trace formula consists of 1258 conjuncts, 94 conjunts are in the unsatisfiable core [2020-07-20 11:59:39,357 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:59:48,324 INFO L134 CoverageAnalysis]: Checked inductivity of 10170 backedges. 4140 proven. 2070 refuted. 0 times theorem prover too weak. 3960 trivial. 0 not checked. [2020-07-20 11:59:48,324 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:59:59,154 INFO L134 CoverageAnalysis]: Checked inductivity of 10170 backedges. 4140 proven. 2070 refuted. 0 times theorem prover too weak. 3960 trivial. 0 not checked. [2020-07-20 11:59:59,154 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1064470843] [2020-07-20 11:59:59,155 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:59:59,155 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [94, 94] total 140 [2020-07-20 11:59:59,155 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1976228430] [2020-07-20 11:59:59,156 INFO L459 AbstractCegarLoop]: Interpolant automaton has 140 states [2020-07-20 11:59:59,156 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:59:59,156 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 140 interpolants. [2020-07-20 11:59:59,157 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4463, Invalid=14997, Unknown=0, NotChecked=0, Total=19460 [2020-07-20 11:59:59,157 INFO L87 Difference]: Start difference. First operand 382 states and 407 transitions. Second operand 140 states. [2020-07-20 12:00:10,690 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 12:00:10,690 INFO L93 Difference]: Finished difference Result 759 states and 922 transitions. [2020-07-20 12:00:10,690 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 94 states. [2020-07-20 12:00:10,690 INFO L78 Accepts]: Start accepts. Automaton has 140 states. Word has length 467 [2020-07-20 12:00:10,691 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 12:00:10,693 INFO L225 Difference]: With dead ends: 759 [2020-07-20 12:00:10,693 INFO L226 Difference]: Without dead ends: 568 [2020-07-20 12:00:10,696 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 979 GetRequests, 749 SyntacticMatches, 46 SemanticMatches, 184 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9270 ImplicationChecksByTransitivity, 24.2s TimeCoverageRelationStatistics Valid=8833, Invalid=25577, Unknown=0, NotChecked=0, Total=34410 [2020-07-20 12:00:10,697 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 568 states. [2020-07-20 12:00:10,710 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 568 to 384. [2020-07-20 12:00:10,710 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 384 states. [2020-07-20 12:00:10,711 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 384 states to 384 states and 409 transitions. [2020-07-20 12:00:10,711 INFO L78 Accepts]: Start accepts. Automaton has 384 states and 409 transitions. Word has length 467 [2020-07-20 12:00:10,711 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 12:00:10,711 INFO L479 AbstractCegarLoop]: Abstraction has 384 states and 409 transitions. [2020-07-20 12:00:10,711 INFO L480 AbstractCegarLoop]: Interpolant automaton has 140 states. [2020-07-20 12:00:10,712 INFO L276 IsEmpty]: Start isEmpty. Operand 384 states and 409 transitions. [2020-07-20 12:00:10,713 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 470 [2020-07-20 12:00:10,713 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 12:00:10,714 INFO L422 BasicCegarLoop]: trace histogram [47, 46, 46, 46, 46, 45, 45, 45, 45, 45, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 12:00:10,914 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 71 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 12:00:10,915 INFO L427 AbstractCegarLoop]: === Iteration 71 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 12:00:10,915 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 12:00:10,915 INFO L82 PathProgramCache]: Analyzing trace with hash 1949894242, now seen corresponding path program 68 times [2020-07-20 12:00:10,916 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 12:00:10,916 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1924146321] [2020-07-20 12:00:10,916 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 72 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 72 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 12:00:11,093 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 12:00:11,097 INFO L263 TraceCheckSpWp]: Trace formula consists of 1268 conjuncts, 95 conjunts are in the unsatisfiable core [2020-07-20 12:00:11,103 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 12:00:14,239 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 12:00:14,503 INFO L134 CoverageAnalysis]: Checked inductivity of 10262 backedges. 2252 proven. 4050 refuted. 0 times theorem prover too weak. 3960 trivial. 0 not checked. [2020-07-20 12:00:14,503 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 12:00:14,643 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 12:00:21,022 INFO L134 CoverageAnalysis]: Checked inductivity of 10262 backedges. 2252 proven. 4050 refuted. 0 times theorem prover too weak. 3960 trivial. 0 not checked. [2020-07-20 12:00:21,022 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1924146321] [2020-07-20 12:00:21,022 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 12:00:21,022 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [51, 51] total 52 [2020-07-20 12:00:21,022 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1815206868] [2020-07-20 12:00:21,023 INFO L459 AbstractCegarLoop]: Interpolant automaton has 52 states [2020-07-20 12:00:21,023 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 12:00:21,023 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2020-07-20 12:00:21,024 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1229, Invalid=1423, Unknown=0, NotChecked=0, Total=2652 [2020-07-20 12:00:21,024 INFO L87 Difference]: Start difference. First operand 384 states and 409 transitions. Second operand 52 states. [2020-07-20 12:00:22,404 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 12:00:22,404 INFO L93 Difference]: Finished difference Result 403 states and 430 transitions. [2020-07-20 12:00:22,406 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 52 states. [2020-07-20 12:00:22,407 INFO L78 Accepts]: Start accepts. Automaton has 52 states. Word has length 469 [2020-07-20 12:00:22,408 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 12:00:22,410 INFO L225 Difference]: With dead ends: 403 [2020-07-20 12:00:22,410 INFO L226 Difference]: Without dead ends: 401 [2020-07-20 12:00:22,410 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 938 GetRequests, 795 SyntacticMatches, 92 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2437 ImplicationChecksByTransitivity, 9.1s TimeCoverageRelationStatistics Valid=1233, Invalid=1523, Unknown=0, NotChecked=0, Total=2756 [2020-07-20 12:00:22,411 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 401 states. [2020-07-20 12:00:22,425 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 401 to 396. [2020-07-20 12:00:22,425 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 396 states. [2020-07-20 12:00:22,425 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 396 states to 396 states and 422 transitions. [2020-07-20 12:00:22,425 INFO L78 Accepts]: Start accepts. Automaton has 396 states and 422 transitions. Word has length 469 [2020-07-20 12:00:22,426 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 12:00:22,426 INFO L479 AbstractCegarLoop]: Abstraction has 396 states and 422 transitions. [2020-07-20 12:00:22,426 INFO L480 AbstractCegarLoop]: Interpolant automaton has 52 states. [2020-07-20 12:00:22,426 INFO L276 IsEmpty]: Start isEmpty. Operand 396 states and 422 transitions. [2020-07-20 12:00:22,428 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 486 [2020-07-20 12:00:22,428 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 12:00:22,428 INFO L422 BasicCegarLoop]: trace histogram [48, 48, 48, 47, 47, 47, 47, 47, 47, 46, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 12:00:22,629 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 72 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 12:00:22,629 INFO L427 AbstractCegarLoop]: === Iteration 72 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 12:00:22,630 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 12:00:22,630 INFO L82 PathProgramCache]: Analyzing trace with hash 676537412, now seen corresponding path program 69 times [2020-07-20 12:00:22,631 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 12:00:22,631 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [414554557] [2020-07-20 12:00:22,631 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 73 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 73 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 12:00:22,810 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 12:00:22,816 INFO L263 TraceCheckSpWp]: Trace formula consists of 1302 conjuncts, 96 conjunts are in the unsatisfiable core [2020-07-20 12:00:22,820 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 12:00:32,817 INFO L134 CoverageAnalysis]: Checked inductivity of 10998 backedges. 4692 proven. 2162 refuted. 0 times theorem prover too weak. 4144 trivial. 0 not checked. [2020-07-20 12:00:32,817 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 12:00:45,107 INFO L134 CoverageAnalysis]: Checked inductivity of 10998 backedges. 4510 proven. 2162 refuted. 0 times theorem prover too weak. 4326 trivial. 0 not checked. [2020-07-20 12:00:45,108 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [414554557] [2020-07-20 12:00:45,108 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 12:00:45,108 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [96, 96] total 143 [2020-07-20 12:00:45,108 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1198907398] [2020-07-20 12:00:45,109 INFO L459 AbstractCegarLoop]: Interpolant automaton has 143 states [2020-07-20 12:00:45,109 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 12:00:45,109 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 143 interpolants. [2020-07-20 12:00:45,110 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4654, Invalid=15652, Unknown=0, NotChecked=0, Total=20306 [2020-07-20 12:00:45,110 INFO L87 Difference]: Start difference. First operand 396 states and 422 transitions. Second operand 143 states. [2020-07-20 12:00:57,912 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 12:00:57,912 INFO L93 Difference]: Finished difference Result 787 states and 954 transitions. [2020-07-20 12:00:57,912 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 96 states. [2020-07-20 12:00:57,912 INFO L78 Accepts]: Start accepts. Automaton has 143 states. Word has length 485 [2020-07-20 12:00:57,913 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 12:00:57,915 INFO L225 Difference]: With dead ends: 787 [2020-07-20 12:00:57,915 INFO L226 Difference]: Without dead ends: 586 [2020-07-20 12:00:57,917 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1016 GetRequests, 781 SyntacticMatches, 47 SemanticMatches, 188 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9683 ImplicationChecksByTransitivity, 27.0s TimeCoverageRelationStatistics Valid=9213, Invalid=26697, Unknown=0, NotChecked=0, Total=35910 [2020-07-20 12:00:57,917 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 586 states. [2020-07-20 12:00:57,931 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 586 to 398. [2020-07-20 12:00:57,931 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 398 states. [2020-07-20 12:00:57,932 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 398 states to 398 states and 424 transitions. [2020-07-20 12:00:57,932 INFO L78 Accepts]: Start accepts. Automaton has 398 states and 424 transitions. Word has length 485 [2020-07-20 12:00:57,932 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 12:00:57,932 INFO L479 AbstractCegarLoop]: Abstraction has 398 states and 424 transitions. [2020-07-20 12:00:57,932 INFO L480 AbstractCegarLoop]: Interpolant automaton has 143 states. [2020-07-20 12:00:57,932 INFO L276 IsEmpty]: Start isEmpty. Operand 398 states and 424 transitions. [2020-07-20 12:00:57,934 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 488 [2020-07-20 12:00:57,934 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 12:00:57,935 INFO L422 BasicCegarLoop]: trace histogram [48, 48, 48, 48, 47, 47, 47, 47, 47, 47, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 12:00:58,135 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 73 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 12:00:58,136 INFO L427 AbstractCegarLoop]: === Iteration 73 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 12:00:58,136 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 12:00:58,136 INFO L82 PathProgramCache]: Analyzing trace with hash 579393385, now seen corresponding path program 70 times [2020-07-20 12:00:58,137 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 12:00:58,137 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1120735079] [2020-07-20 12:00:58,137 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 74 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 74 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 12:00:58,319 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 12:00:58,324 INFO L263 TraceCheckSpWp]: Trace formula consists of 1312 conjuncts, 98 conjunts are in the unsatisfiable core [2020-07-20 12:00:58,329 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 12:01:09,496 INFO L134 CoverageAnalysis]: Checked inductivity of 11092 backedges. 4512 proven. 2256 refuted. 0 times theorem prover too weak. 4324 trivial. 0 not checked. [2020-07-20 12:01:09,496 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 12:01:22,762 INFO L134 CoverageAnalysis]: Checked inductivity of 11092 backedges. 4512 proven. 2256 refuted. 0 times theorem prover too weak. 4324 trivial. 0 not checked. [2020-07-20 12:01:22,763 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1120735079] [2020-07-20 12:01:22,763 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 12:01:22,763 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [98, 98] total 146 [2020-07-20 12:01:22,763 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1720090962] [2020-07-20 12:01:22,764 INFO L459 AbstractCegarLoop]: Interpolant automaton has 146 states [2020-07-20 12:01:22,764 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 12:01:22,765 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 146 interpolants. [2020-07-20 12:01:22,766 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4849, Invalid=16321, Unknown=0, NotChecked=0, Total=21170 [2020-07-20 12:01:22,766 INFO L87 Difference]: Start difference. First operand 398 states and 424 transitions. Second operand 146 states. [2020-07-20 12:01:37,741 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 12:01:37,741 INFO L93 Difference]: Finished difference Result 791 states and 961 transitions. [2020-07-20 12:01:37,742 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 98 states. [2020-07-20 12:01:37,742 INFO L78 Accepts]: Start accepts. Automaton has 146 states. Word has length 487 [2020-07-20 12:01:37,742 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 12:01:37,744 INFO L225 Difference]: With dead ends: 791 [2020-07-20 12:01:37,744 INFO L226 Difference]: Without dead ends: 592 [2020-07-20 12:01:37,747 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1021 GetRequests, 781 SyntacticMatches, 48 SemanticMatches, 192 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10105 ImplicationChecksByTransitivity, 29.8s TimeCoverageRelationStatistics Valid=9601, Invalid=27841, Unknown=0, NotChecked=0, Total=37442 [2020-07-20 12:01:37,747 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 592 states. [2020-07-20 12:01:37,763 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 592 to 400. [2020-07-20 12:01:37,763 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 400 states. [2020-07-20 12:01:37,764 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 400 states to 400 states and 426 transitions. [2020-07-20 12:01:37,764 INFO L78 Accepts]: Start accepts. Automaton has 400 states and 426 transitions. Word has length 487 [2020-07-20 12:01:37,764 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 12:01:37,765 INFO L479 AbstractCegarLoop]: Abstraction has 400 states and 426 transitions. [2020-07-20 12:01:37,765 INFO L480 AbstractCegarLoop]: Interpolant automaton has 146 states. [2020-07-20 12:01:37,765 INFO L276 IsEmpty]: Start isEmpty. Operand 400 states and 426 transitions. [2020-07-20 12:01:37,768 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 490 [2020-07-20 12:01:37,768 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 12:01:37,768 INFO L422 BasicCegarLoop]: trace histogram [49, 48, 48, 48, 48, 47, 47, 47, 47, 47, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 12:01:37,969 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 74 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 12:01:37,969 INFO L427 AbstractCegarLoop]: === Iteration 74 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 12:01:37,970 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 12:01:37,970 INFO L82 PathProgramCache]: Analyzing trace with hash 1713263950, now seen corresponding path program 71 times [2020-07-20 12:01:37,970 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 12:01:37,970 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1812683997] [2020-07-20 12:01:37,971 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 75 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 75 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 12:01:38,158 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 12:01:38,164 INFO L263 TraceCheckSpWp]: Trace formula consists of 1322 conjuncts, 99 conjunts are in the unsatisfiable core [2020-07-20 12:01:38,168 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 12:01:42,086 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 12:01:42,391 INFO L134 CoverageAnalysis]: Checked inductivity of 11188 backedges. 2446 proven. 4418 refuted. 0 times theorem prover too weak. 4324 trivial. 0 not checked. [2020-07-20 12:01:42,392 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 12:01:42,558 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 12:01:50,269 INFO L134 CoverageAnalysis]: Checked inductivity of 11188 backedges. 2446 proven. 4418 refuted. 0 times theorem prover too weak. 4324 trivial. 0 not checked. [2020-07-20 12:01:50,270 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1812683997] [2020-07-20 12:01:50,270 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 12:01:50,270 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [53, 53] total 54 [2020-07-20 12:01:50,270 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [936086828] [2020-07-20 12:01:50,271 INFO L459 AbstractCegarLoop]: Interpolant automaton has 54 states [2020-07-20 12:01:50,271 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 12:01:50,271 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 54 interpolants. [2020-07-20 12:01:50,271 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1330, Invalid=1532, Unknown=0, NotChecked=0, Total=2862 [2020-07-20 12:01:50,271 INFO L87 Difference]: Start difference. First operand 400 states and 426 transitions. Second operand 54 states. [2020-07-20 12:01:51,765 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 12:01:51,765 INFO L93 Difference]: Finished difference Result 419 states and 447 transitions. [2020-07-20 12:01:51,768 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 54 states. [2020-07-20 12:01:51,768 INFO L78 Accepts]: Start accepts. Automaton has 54 states. Word has length 489 [2020-07-20 12:01:51,769 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 12:01:51,771 INFO L225 Difference]: With dead ends: 419 [2020-07-20 12:01:51,771 INFO L226 Difference]: Without dead ends: 417 [2020-07-20 12:01:51,772 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 978 GetRequests, 829 SyntacticMatches, 96 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2639 ImplicationChecksByTransitivity, 11.1s TimeCoverageRelationStatistics Valid=1334, Invalid=1636, Unknown=0, NotChecked=0, Total=2970 [2020-07-20 12:01:51,772 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 417 states. [2020-07-20 12:01:51,787 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 417 to 412. [2020-07-20 12:01:51,787 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 412 states. [2020-07-20 12:01:51,787 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 412 states to 412 states and 439 transitions. [2020-07-20 12:01:51,787 INFO L78 Accepts]: Start accepts. Automaton has 412 states and 439 transitions. Word has length 489 [2020-07-20 12:01:51,788 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 12:01:51,788 INFO L479 AbstractCegarLoop]: Abstraction has 412 states and 439 transitions. [2020-07-20 12:01:51,788 INFO L480 AbstractCegarLoop]: Interpolant automaton has 54 states. [2020-07-20 12:01:51,788 INFO L276 IsEmpty]: Start isEmpty. Operand 412 states and 439 transitions. [2020-07-20 12:01:51,790 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 506 [2020-07-20 12:01:51,790 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 12:01:51,790 INFO L422 BasicCegarLoop]: trace histogram [50, 50, 50, 49, 49, 49, 49, 49, 49, 48, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 12:01:51,991 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 75 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 12:01:51,991 INFO L427 AbstractCegarLoop]: === Iteration 75 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 12:01:51,991 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 12:01:51,992 INFO L82 PathProgramCache]: Analyzing trace with hash -831186128, now seen corresponding path program 72 times [2020-07-20 12:01:51,992 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 12:01:51,992 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1300860704] [2020-07-20 12:01:51,992 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 76 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 76 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 12:01:52,177 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 12:01:52,182 INFO L263 TraceCheckSpWp]: Trace formula consists of 1356 conjuncts, 100 conjunts are in the unsatisfiable core [2020-07-20 12:01:52,186 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 12:02:03,411 INFO L134 CoverageAnalysis]: Checked inductivity of 11956 backedges. 5088 proven. 2352 refuted. 0 times theorem prover too weak. 4516 trivial. 0 not checked. [2020-07-20 12:02:03,411 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 12:02:16,732 INFO L134 CoverageAnalysis]: Checked inductivity of 11956 backedges. 4898 proven. 2352 refuted. 0 times theorem prover too weak. 4706 trivial. 0 not checked. [2020-07-20 12:02:16,733 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1300860704] [2020-07-20 12:02:16,733 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 12:02:16,733 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [100, 100] total 149 [2020-07-20 12:02:16,733 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2090196715] [2020-07-20 12:02:16,734 INFO L459 AbstractCegarLoop]: Interpolant automaton has 149 states [2020-07-20 12:02:16,734 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 12:02:16,734 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 149 interpolants. [2020-07-20 12:02:16,735 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5048, Invalid=17004, Unknown=0, NotChecked=0, Total=22052 [2020-07-20 12:02:16,735 INFO L87 Difference]: Start difference. First operand 412 states and 439 transitions. Second operand 149 states. [2020-07-20 12:02:30,002 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 12:02:30,003 INFO L93 Difference]: Finished difference Result 819 states and 993 transitions. [2020-07-20 12:02:30,003 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 100 states. [2020-07-20 12:02:30,003 INFO L78 Accepts]: Start accepts. Automaton has 149 states. Word has length 505 [2020-07-20 12:02:30,003 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 12:02:30,005 INFO L225 Difference]: With dead ends: 819 [2020-07-20 12:02:30,005 INFO L226 Difference]: Without dead ends: 610 [2020-07-20 12:02:30,008 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1058 GetRequests, 813 SyntacticMatches, 49 SemanticMatches, 196 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10536 ImplicationChecksByTransitivity, 29.5s TimeCoverageRelationStatistics Valid=9997, Invalid=29009, Unknown=0, NotChecked=0, Total=39006 [2020-07-20 12:02:30,008 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 610 states. [2020-07-20 12:02:30,022 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 610 to 414. [2020-07-20 12:02:30,022 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 414 states. [2020-07-20 12:02:30,022 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 414 states to 414 states and 441 transitions. [2020-07-20 12:02:30,022 INFO L78 Accepts]: Start accepts. Automaton has 414 states and 441 transitions. Word has length 505 [2020-07-20 12:02:30,023 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 12:02:30,023 INFO L479 AbstractCegarLoop]: Abstraction has 414 states and 441 transitions. [2020-07-20 12:02:30,023 INFO L480 AbstractCegarLoop]: Interpolant automaton has 149 states. [2020-07-20 12:02:30,023 INFO L276 IsEmpty]: Start isEmpty. Operand 414 states and 441 transitions. [2020-07-20 12:02:30,025 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 508 [2020-07-20 12:02:30,025 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 12:02:30,025 INFO L422 BasicCegarLoop]: trace histogram [50, 50, 50, 50, 49, 49, 49, 49, 49, 49, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 12:02:30,225 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 76 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 12:02:30,226 INFO L427 AbstractCegarLoop]: === Iteration 76 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 12:02:30,226 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 12:02:30,227 INFO L82 PathProgramCache]: Analyzing trace with hash 1643039189, now seen corresponding path program 73 times [2020-07-20 12:02:30,227 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 12:02:30,227 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1669658565] [2020-07-20 12:02:30,227 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 77 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 77 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 12:02:30,419 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 12:02:30,423 INFO L263 TraceCheckSpWp]: Trace formula consists of 1366 conjuncts, 102 conjunts are in the unsatisfiable core [2020-07-20 12:02:30,427 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 12:02:43,091 INFO L134 CoverageAnalysis]: Checked inductivity of 12054 backedges. 4900 proven. 2450 refuted. 0 times theorem prover too weak. 4704 trivial. 0 not checked. [2020-07-20 12:02:43,091 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 12:02:58,161 INFO L134 CoverageAnalysis]: Checked inductivity of 12054 backedges. 4900 proven. 2450 refuted. 0 times theorem prover too weak. 4704 trivial. 0 not checked. [2020-07-20 12:02:58,161 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1669658565] [2020-07-20 12:02:58,162 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 12:02:58,162 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [102, 102] total 152 [2020-07-20 12:02:58,162 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1112060588] [2020-07-20 12:02:58,163 INFO L459 AbstractCegarLoop]: Interpolant automaton has 152 states [2020-07-20 12:02:58,163 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 12:02:58,163 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 152 interpolants. [2020-07-20 12:02:58,164 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5251, Invalid=17701, Unknown=0, NotChecked=0, Total=22952 [2020-07-20 12:02:58,164 INFO L87 Difference]: Start difference. First operand 414 states and 441 transitions. Second operand 152 states. [2020-07-20 12:03:14,271 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 12:03:14,271 INFO L93 Difference]: Finished difference Result 823 states and 1000 transitions. [2020-07-20 12:03:14,271 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 102 states. [2020-07-20 12:03:14,271 INFO L78 Accepts]: Start accepts. Automaton has 152 states. Word has length 507 [2020-07-20 12:03:14,272 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 12:03:14,274 INFO L225 Difference]: With dead ends: 823 [2020-07-20 12:03:14,275 INFO L226 Difference]: Without dead ends: 616 [2020-07-20 12:03:14,277 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1063 GetRequests, 813 SyntacticMatches, 50 SemanticMatches, 200 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10976 ImplicationChecksByTransitivity, 33.5s TimeCoverageRelationStatistics Valid=10401, Invalid=30201, Unknown=0, NotChecked=0, Total=40602 [2020-07-20 12:03:14,278 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 616 states. [2020-07-20 12:03:14,298 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 616 to 416. [2020-07-20 12:03:14,298 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 416 states. [2020-07-20 12:03:14,299 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 416 states to 416 states and 443 transitions. [2020-07-20 12:03:14,299 INFO L78 Accepts]: Start accepts. Automaton has 416 states and 443 transitions. Word has length 507 [2020-07-20 12:03:14,299 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 12:03:14,299 INFO L479 AbstractCegarLoop]: Abstraction has 416 states and 443 transitions. [2020-07-20 12:03:14,299 INFO L480 AbstractCegarLoop]: Interpolant automaton has 152 states. [2020-07-20 12:03:14,299 INFO L276 IsEmpty]: Start isEmpty. Operand 416 states and 443 transitions. [2020-07-20 12:03:14,302 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 510 [2020-07-20 12:03:14,302 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 12:03:14,303 INFO L422 BasicCegarLoop]: trace histogram [51, 50, 50, 50, 50, 49, 49, 49, 49, 49, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 12:03:14,514 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 77 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 12:03:14,515 INFO L427 AbstractCegarLoop]: === Iteration 77 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 12:03:14,515 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 12:03:14,516 INFO L82 PathProgramCache]: Analyzing trace with hash -38313158, now seen corresponding path program 74 times [2020-07-20 12:03:14,516 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 12:03:14,516 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1525984891] [2020-07-20 12:03:14,516 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 78 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 78 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 12:03:14,700 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 12:03:14,705 INFO L263 TraceCheckSpWp]: Trace formula consists of 1376 conjuncts, 103 conjunts are in the unsatisfiable core [2020-07-20 12:03:14,709 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 12:03:18,790 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 12:03:19,107 INFO L134 CoverageAnalysis]: Checked inductivity of 12154 backedges. 2648 proven. 4802 refuted. 0 times theorem prover too weak. 4704 trivial. 0 not checked. [2020-07-20 12:03:19,107 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 12:03:19,283 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 12:03:27,838 INFO L134 CoverageAnalysis]: Checked inductivity of 12154 backedges. 2648 proven. 4802 refuted. 0 times theorem prover too weak. 4704 trivial. 0 not checked. [2020-07-20 12:03:27,839 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1525984891] [2020-07-20 12:03:27,839 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 12:03:27,839 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [55, 55] total 56 [2020-07-20 12:03:27,839 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [407694283] [2020-07-20 12:03:27,840 INFO L459 AbstractCegarLoop]: Interpolant automaton has 56 states [2020-07-20 12:03:27,840 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 12:03:27,840 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 56 interpolants. [2020-07-20 12:03:27,841 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1435, Invalid=1645, Unknown=0, NotChecked=0, Total=3080 [2020-07-20 12:03:27,841 INFO L87 Difference]: Start difference. First operand 416 states and 443 transitions. Second operand 56 states. [2020-07-20 12:03:29,644 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 12:03:29,644 INFO L93 Difference]: Finished difference Result 435 states and 464 transitions. [2020-07-20 12:03:29,648 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 56 states. [2020-07-20 12:03:29,648 INFO L78 Accepts]: Start accepts. Automaton has 56 states. Word has length 509 [2020-07-20 12:03:29,649 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 12:03:29,652 INFO L225 Difference]: With dead ends: 435 [2020-07-20 12:03:29,652 INFO L226 Difference]: Without dead ends: 433 [2020-07-20 12:03:29,652 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1018 GetRequests, 863 SyntacticMatches, 100 SemanticMatches, 55 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2849 ImplicationChecksByTransitivity, 12.1s TimeCoverageRelationStatistics Valid=1439, Invalid=1753, Unknown=0, NotChecked=0, Total=3192 [2020-07-20 12:03:29,653 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 433 states. [2020-07-20 12:03:29,672 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 433 to 428. [2020-07-20 12:03:29,672 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 428 states. [2020-07-20 12:03:29,673 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 428 states to 428 states and 456 transitions. [2020-07-20 12:03:29,673 INFO L78 Accepts]: Start accepts. Automaton has 428 states and 456 transitions. Word has length 509 [2020-07-20 12:03:29,673 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 12:03:29,673 INFO L479 AbstractCegarLoop]: Abstraction has 428 states and 456 transitions. [2020-07-20 12:03:29,673 INFO L480 AbstractCegarLoop]: Interpolant automaton has 56 states. [2020-07-20 12:03:29,673 INFO L276 IsEmpty]: Start isEmpty. Operand 428 states and 456 transitions. [2020-07-20 12:03:29,675 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 526 [2020-07-20 12:03:29,675 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 12:03:29,676 INFO L422 BasicCegarLoop]: trace histogram [52, 52, 52, 51, 51, 51, 51, 51, 51, 50, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 12:03:29,876 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 78 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 12:03:29,877 INFO L427 AbstractCegarLoop]: === Iteration 78 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 12:03:29,877 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 12:03:29,877 INFO L82 PathProgramCache]: Analyzing trace with hash 283955484, now seen corresponding path program 75 times [2020-07-20 12:03:29,878 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 12:03:29,878 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [204200996] [2020-07-20 12:03:29,878 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 79 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 79 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 12:03:30,066 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 12:03:30,070 INFO L263 TraceCheckSpWp]: Trace formula consists of 1410 conjuncts, 104 conjunts are in the unsatisfiable core [2020-07-20 12:03:30,075 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 12:03:43,317 INFO L134 CoverageAnalysis]: Checked inductivity of 12954 backedges. 5500 proven. 2550 refuted. 0 times theorem prover too weak. 4904 trivial. 0 not checked. [2020-07-20 12:03:43,318 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 12:03:58,901 INFO L134 CoverageAnalysis]: Checked inductivity of 12954 backedges. 5302 proven. 2550 refuted. 0 times theorem prover too weak. 5102 trivial. 0 not checked. [2020-07-20 12:03:58,901 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [204200996] [2020-07-20 12:03:58,901 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 12:03:58,902 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [104, 104] total 155 [2020-07-20 12:03:58,902 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2069864299] [2020-07-20 12:03:58,902 INFO L459 AbstractCegarLoop]: Interpolant automaton has 155 states [2020-07-20 12:03:58,903 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 12:03:58,903 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 155 interpolants. [2020-07-20 12:03:58,904 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5458, Invalid=18412, Unknown=0, NotChecked=0, Total=23870 [2020-07-20 12:03:58,904 INFO L87 Difference]: Start difference. First operand 428 states and 456 transitions. Second operand 155 states. [2020-07-20 12:04:15,737 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 12:04:15,737 INFO L93 Difference]: Finished difference Result 851 states and 1032 transitions. [2020-07-20 12:04:15,737 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 104 states. [2020-07-20 12:04:15,737 INFO L78 Accepts]: Start accepts. Automaton has 155 states. Word has length 525 [2020-07-20 12:04:15,738 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 12:04:15,740 INFO L225 Difference]: With dead ends: 851 [2020-07-20 12:04:15,741 INFO L226 Difference]: Without dead ends: 634 [2020-07-20 12:04:15,744 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1100 GetRequests, 845 SyntacticMatches, 51 SemanticMatches, 204 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11425 ImplicationChecksByTransitivity, 35.1s TimeCoverageRelationStatistics Valid=10813, Invalid=31417, Unknown=0, NotChecked=0, Total=42230 [2020-07-20 12:04:15,745 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 634 states. [2020-07-20 12:04:15,768 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 634 to 430. [2020-07-20 12:04:15,769 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 430 states. [2020-07-20 12:04:15,769 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 430 states to 430 states and 458 transitions. [2020-07-20 12:04:15,770 INFO L78 Accepts]: Start accepts. Automaton has 430 states and 458 transitions. Word has length 525 [2020-07-20 12:04:15,770 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 12:04:15,770 INFO L479 AbstractCegarLoop]: Abstraction has 430 states and 458 transitions. [2020-07-20 12:04:15,770 INFO L480 AbstractCegarLoop]: Interpolant automaton has 155 states. [2020-07-20 12:04:15,770 INFO L276 IsEmpty]: Start isEmpty. Operand 430 states and 458 transitions. [2020-07-20 12:04:15,774 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 528 [2020-07-20 12:04:15,774 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 12:04:15,774 INFO L422 BasicCegarLoop]: trace histogram [52, 52, 52, 52, 51, 51, 51, 51, 51, 51, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 12:04:15,989 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 79 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 12:04:15,990 INFO L427 AbstractCegarLoop]: === Iteration 79 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 12:04:15,990 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 12:04:15,991 INFO L82 PathProgramCache]: Analyzing trace with hash 1129954113, now seen corresponding path program 76 times [2020-07-20 12:04:15,991 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 12:04:15,991 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [941336950] [2020-07-20 12:04:15,992 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 80 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 80 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 12:04:16,178 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 12:04:16,183 INFO L263 TraceCheckSpWp]: Trace formula consists of 1420 conjuncts, 106 conjunts are in the unsatisfiable core [2020-07-20 12:04:16,187 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 12:04:31,039 INFO L134 CoverageAnalysis]: Checked inductivity of 13056 backedges. 5304 proven. 2652 refuted. 0 times theorem prover too weak. 5100 trivial. 0 not checked. [2020-07-20 12:04:31,039 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 12:04:48,982 INFO L134 CoverageAnalysis]: Checked inductivity of 13056 backedges. 5304 proven. 2652 refuted. 0 times theorem prover too weak. 5100 trivial. 0 not checked. [2020-07-20 12:04:48,982 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [941336950] [2020-07-20 12:04:48,982 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 12:04:48,983 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [106, 106] total 158 [2020-07-20 12:04:48,983 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1211980892] [2020-07-20 12:04:48,984 INFO L459 AbstractCegarLoop]: Interpolant automaton has 158 states [2020-07-20 12:04:48,984 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 12:04:48,985 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 158 interpolants. [2020-07-20 12:04:48,986 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5669, Invalid=19137, Unknown=0, NotChecked=0, Total=24806 [2020-07-20 12:04:48,987 INFO L87 Difference]: Start difference. First operand 430 states and 458 transitions. Second operand 158 states. [2020-07-20 12:05:08,979 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 12:05:08,979 INFO L93 Difference]: Finished difference Result 855 states and 1039 transitions. [2020-07-20 12:05:08,980 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 106 states. [2020-07-20 12:05:08,980 INFO L78 Accepts]: Start accepts. Automaton has 158 states. Word has length 527 [2020-07-20 12:05:08,980 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 12:05:08,983 INFO L225 Difference]: With dead ends: 855 [2020-07-20 12:05:08,983 INFO L226 Difference]: Without dead ends: 640 [2020-07-20 12:05:08,987 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1105 GetRequests, 845 SyntacticMatches, 52 SemanticMatches, 208 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11883 ImplicationChecksByTransitivity, 40.2s TimeCoverageRelationStatistics Valid=11233, Invalid=32657, Unknown=0, NotChecked=0, Total=43890 [2020-07-20 12:05:08,988 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 640 states. [2020-07-20 12:05:09,012 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 640 to 432. [2020-07-20 12:05:09,012 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 432 states. [2020-07-20 12:05:09,013 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 432 states to 432 states and 460 transitions. [2020-07-20 12:05:09,014 INFO L78 Accepts]: Start accepts. Automaton has 432 states and 460 transitions. Word has length 527 [2020-07-20 12:05:09,014 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 12:05:09,014 INFO L479 AbstractCegarLoop]: Abstraction has 432 states and 460 transitions. [2020-07-20 12:05:09,014 INFO L480 AbstractCegarLoop]: Interpolant automaton has 158 states. [2020-07-20 12:05:09,014 INFO L276 IsEmpty]: Start isEmpty. Operand 432 states and 460 transitions. [2020-07-20 12:05:09,018 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 530 [2020-07-20 12:05:09,018 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 12:05:09,019 INFO L422 BasicCegarLoop]: trace histogram [53, 52, 52, 52, 52, 51, 51, 51, 51, 51, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 12:05:09,233 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 80 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 12:05:09,234 INFO L427 AbstractCegarLoop]: === Iteration 80 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 12:05:09,234 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 12:05:09,235 INFO L82 PathProgramCache]: Analyzing trace with hash -1909149658, now seen corresponding path program 77 times [2020-07-20 12:05:09,235 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 12:05:09,235 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1462661802] [2020-07-20 12:05:09,236 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 81 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 81 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 12:05:09,511 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 12:05:09,522 INFO L263 TraceCheckSpWp]: Trace formula consists of 1430 conjuncts, 107 conjunts are in the unsatisfiable core [2020-07-20 12:05:09,529 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 12:05:15,091 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 12:05:15,438 INFO L134 CoverageAnalysis]: Checked inductivity of 13160 backedges. 2858 proven. 5202 refuted. 0 times theorem prover too weak. 5100 trivial. 0 not checked. [2020-07-20 12:05:15,439 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 12:05:15,655 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 12:05:26,945 INFO L134 CoverageAnalysis]: Checked inductivity of 13160 backedges. 2858 proven. 5202 refuted. 0 times theorem prover too weak. 5100 trivial. 0 not checked. [2020-07-20 12:05:26,946 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1462661802] [2020-07-20 12:05:26,946 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 12:05:26,946 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [57, 57] total 58 [2020-07-20 12:05:26,946 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [300495309] [2020-07-20 12:05:26,947 INFO L459 AbstractCegarLoop]: Interpolant automaton has 58 states [2020-07-20 12:05:26,947 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 12:05:26,947 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 58 interpolants. [2020-07-20 12:05:26,947 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1544, Invalid=1762, Unknown=0, NotChecked=0, Total=3306 [2020-07-20 12:05:26,947 INFO L87 Difference]: Start difference. First operand 432 states and 460 transitions. Second operand 58 states. [2020-07-20 12:05:29,374 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 12:05:29,374 INFO L93 Difference]: Finished difference Result 451 states and 481 transitions. [2020-07-20 12:05:29,378 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 58 states. [2020-07-20 12:05:29,378 INFO L78 Accepts]: Start accepts. Automaton has 58 states. Word has length 529 [2020-07-20 12:05:29,379 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 12:05:29,381 INFO L225 Difference]: With dead ends: 451 [2020-07-20 12:05:29,381 INFO L226 Difference]: Without dead ends: 449 [2020-07-20 12:05:29,382 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1058 GetRequests, 897 SyntacticMatches, 104 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3067 ImplicationChecksByTransitivity, 16.1s TimeCoverageRelationStatistics Valid=1548, Invalid=1874, Unknown=0, NotChecked=0, Total=3422 [2020-07-20 12:05:29,382 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 449 states. [2020-07-20 12:05:29,401 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 449 to 444. [2020-07-20 12:05:29,402 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 444 states. [2020-07-20 12:05:29,402 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 444 states to 444 states and 473 transitions. [2020-07-20 12:05:29,403 INFO L78 Accepts]: Start accepts. Automaton has 444 states and 473 transitions. Word has length 529 [2020-07-20 12:05:29,403 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 12:05:29,403 INFO L479 AbstractCegarLoop]: Abstraction has 444 states and 473 transitions. [2020-07-20 12:05:29,403 INFO L480 AbstractCegarLoop]: Interpolant automaton has 58 states. [2020-07-20 12:05:29,403 INFO L276 IsEmpty]: Start isEmpty. Operand 444 states and 473 transitions. [2020-07-20 12:05:29,405 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 546 [2020-07-20 12:05:29,405 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 12:05:29,406 INFO L422 BasicCegarLoop]: trace histogram [54, 54, 54, 53, 53, 53, 53, 53, 53, 52, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 12:05:29,606 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 81 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 12:05:29,607 INFO L427 AbstractCegarLoop]: === Iteration 81 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 12:05:29,607 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 12:05:29,607 INFO L82 PathProgramCache]: Analyzing trace with hash -773143032, now seen corresponding path program 78 times [2020-07-20 12:05:29,608 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 12:05:29,608 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1384336294] [2020-07-20 12:05:29,608 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 82 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 82 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 12:05:29,814 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 12:05:29,820 INFO L263 TraceCheckSpWp]: Trace formula consists of 1464 conjuncts, 108 conjunts are in the unsatisfiable core [2020-07-20 12:05:29,824 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 12:05:47,375 INFO L134 CoverageAnalysis]: Checked inductivity of 13992 backedges. 5928 proven. 2756 refuted. 0 times theorem prover too weak. 5308 trivial. 0 not checked. [2020-07-20 12:05:47,375 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 12:06:08,319 INFO L134 CoverageAnalysis]: Checked inductivity of 13992 backedges. 5722 proven. 2756 refuted. 0 times theorem prover too weak. 5514 trivial. 0 not checked. [2020-07-20 12:06:08,320 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1384336294] [2020-07-20 12:06:08,320 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 12:06:08,320 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [108, 108] total 161 [2020-07-20 12:06:08,320 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [214053348] [2020-07-20 12:06:08,321 INFO L459 AbstractCegarLoop]: Interpolant automaton has 161 states [2020-07-20 12:06:08,321 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 12:06:08,322 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 161 interpolants. [2020-07-20 12:06:08,323 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5884, Invalid=19876, Unknown=0, NotChecked=0, Total=25760 [2020-07-20 12:06:08,323 INFO L87 Difference]: Start difference. First operand 444 states and 473 transitions. Second operand 161 states. [2020-07-20 12:06:31,628 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 12:06:31,629 INFO L93 Difference]: Finished difference Result 883 states and 1071 transitions. [2020-07-20 12:06:31,629 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 108 states. [2020-07-20 12:06:31,629 INFO L78 Accepts]: Start accepts. Automaton has 161 states. Word has length 545 [2020-07-20 12:06:31,629 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 12:06:31,631 INFO L225 Difference]: With dead ends: 883 [2020-07-20 12:06:31,631 INFO L226 Difference]: Without dead ends: 658 [2020-07-20 12:06:31,634 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1142 GetRequests, 877 SyntacticMatches, 53 SemanticMatches, 212 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12350 ImplicationChecksByTransitivity, 47.3s TimeCoverageRelationStatistics Valid=11661, Invalid=33921, Unknown=0, NotChecked=0, Total=45582 [2020-07-20 12:06:31,635 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 658 states. [2020-07-20 12:06:31,653 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 658 to 446. [2020-07-20 12:06:31,653 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 446 states. [2020-07-20 12:06:31,654 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 446 states to 446 states and 475 transitions. [2020-07-20 12:06:31,654 INFO L78 Accepts]: Start accepts. Automaton has 446 states and 475 transitions. Word has length 545 [2020-07-20 12:06:31,654 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 12:06:31,654 INFO L479 AbstractCegarLoop]: Abstraction has 446 states and 475 transitions. [2020-07-20 12:06:31,654 INFO L480 AbstractCegarLoop]: Interpolant automaton has 161 states. [2020-07-20 12:06:31,654 INFO L276 IsEmpty]: Start isEmpty. Operand 446 states and 475 transitions. [2020-07-20 12:06:31,657 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 548 [2020-07-20 12:06:31,657 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 12:06:31,657 INFO L422 BasicCegarLoop]: trace histogram [54, 54, 54, 54, 53, 53, 53, 53, 53, 53, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 12:06:31,858 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 82 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 12:06:31,858 INFO L427 AbstractCegarLoop]: === Iteration 82 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 12:06:31,859 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 12:06:31,859 INFO L82 PathProgramCache]: Analyzing trace with hash 953822125, now seen corresponding path program 79 times [2020-07-20 12:06:31,860 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 12:06:31,860 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [807687655] [2020-07-20 12:06:31,860 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 83 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 83 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 12:06:32,070 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 12:06:32,076 INFO L263 TraceCheckSpWp]: Trace formula consists of 1474 conjuncts, 110 conjunts are in the unsatisfiable core [2020-07-20 12:06:32,081 INFO L286 TraceCheckSpWp]: Computing forward predicates...