/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/recursive-simple/id_o100.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-20 11:15:23,098 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-20 11:15:23,102 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-20 11:15:23,130 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-20 11:15:23,131 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-20 11:15:23,133 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-20 11:15:23,136 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-20 11:15:23,152 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-20 11:15:23,156 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-20 11:15:23,159 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-20 11:15:23,163 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-20 11:15:23,166 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-20 11:15:23,167 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-20 11:15:23,172 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-20 11:15:23,176 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-20 11:15:23,179 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-20 11:15:23,182 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-20 11:15:23,184 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-20 11:15:23,186 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-20 11:15:23,194 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-20 11:15:23,202 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-20 11:15:23,207 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-20 11:15:23,209 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-20 11:15:23,211 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-20 11:15:23,215 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-20 11:15:23,233 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-20 11:15:23,235 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-20 11:15:23,237 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-20 11:15:23,239 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 11:15:23,282 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-20 11:15:23,283 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-20 11:15:23,286 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-20 11:15:23,286 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-20 11:15:23,286 INFO L138 SettingsManager]: * Use SBE=true [2020-07-20 11:15:23,287 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-20 11:15:23,287 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-20 11:15:23,288 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-20 11:15:23,288 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-20 11:15:23,289 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-20 11:15:23,290 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-20 11:15:23,290 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-20 11:15:23,291 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-20 11:15:23,291 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-20 11:15:23,292 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-20 11:15:23,292 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-20 11:15:23,292 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-20 11:15:23,292 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-20 11:15:23,292 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-20 11:15:23,293 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-20 11:15:23,293 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-20 11:15:23,293 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 11:15:23,293 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-20 11:15:23,294 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-20 11:15:23,294 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-20 11:15:23,294 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-20 11:15:23,294 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:15:23,294 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-20 11:15:23,295 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-20 11:15:23,295 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 11:15:23,674 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-20 11:15:23,693 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-20 11:15:23,698 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-20 11:15:23,701 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-20 11:15:23,701 INFO L275 PluginConnector]: CDTParser initialized [2020-07-20 11:15:23,702 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive-simple/id_o100.c [2020-07-20 11:15:23,816 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/e1daf7faf/1e71df447c384f20ba8d10ad5dfb8fe4/FLAG77bc6d364 [2020-07-20 11:15:24,402 INFO L306 CDTParser]: Found 1 translation units. [2020-07-20 11:15:24,403 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/recursive-simple/id_o100.c [2020-07-20 11:15:24,414 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/e1daf7faf/1e71df447c384f20ba8d10ad5dfb8fe4/FLAG77bc6d364 [2020-07-20 11:15:24,729 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/e1daf7faf/1e71df447c384f20ba8d10ad5dfb8fe4 [2020-07-20 11:15:24,742 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-20 11:15:24,745 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-20 11:15:24,747 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-20 11:15:24,747 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-20 11:15:24,752 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-20 11:15:24,754 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 11:15:24" (1/1) ... [2020-07-20 11:15:24,758 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@5275884 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:15:24, skipping insertion in model container [2020-07-20 11:15:24,758 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 11:15:24" (1/1) ... [2020-07-20 11:15:24,769 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-20 11:15:24,791 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-20 11:15:24,986 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 11:15:24,992 INFO L203 MainTranslator]: Completed pre-run [2020-07-20 11:15:25,011 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 11:15:25,029 INFO L208 MainTranslator]: Completed translation [2020-07-20 11:15:25,030 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:15:25 WrapperNode [2020-07-20 11:15:25,030 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-20 11:15:25,031 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-20 11:15:25,031 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-20 11:15:25,032 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-20 11:15:25,048 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:15:25" (1/1) ... [2020-07-20 11:15:25,049 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:15:25" (1/1) ... [2020-07-20 11:15:25,055 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:15:25" (1/1) ... [2020-07-20 11:15:25,056 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:15:25" (1/1) ... [2020-07-20 11:15:25,062 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:15:25" (1/1) ... [2020-07-20 11:15:25,065 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:15:25" (1/1) ... [2020-07-20 11:15:25,067 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:15:25" (1/1) ... [2020-07-20 11:15:25,069 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-20 11:15:25,070 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-20 11:15:25,070 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-20 11:15:25,070 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-20 11:15:25,072 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:15:25" (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 11:15:25,274 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-20 11:15:25,274 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-20 11:15:25,275 INFO L138 BoogieDeclarations]: Found implementation of procedure id [2020-07-20 11:15:25,275 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-20 11:15:25,275 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_uint [2020-07-20 11:15:25,275 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-20 11:15:25,275 INFO L130 BoogieDeclarations]: Found specification of procedure id [2020-07-20 11:15:25,276 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-20 11:15:25,276 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-20 11:15:25,276 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-20 11:15:25,494 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-20 11:15:25,495 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-07-20 11:15:25,500 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 11:15:25 BoogieIcfgContainer [2020-07-20 11:15:25,501 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-20 11:15:25,502 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-20 11:15:25,503 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-20 11:15:25,507 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-20 11:15:25,507 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.07 11:15:24" (1/3) ... [2020-07-20 11:15:25,509 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@70f5ed38 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 11:15:25, skipping insertion in model container [2020-07-20 11:15:25,509 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:15:25" (2/3) ... [2020-07-20 11:15:25,510 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@70f5ed38 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 11:15:25, skipping insertion in model container [2020-07-20 11:15:25,510 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 11:15:25" (3/3) ... [2020-07-20 11:15:25,512 INFO L109 eAbstractionObserver]: Analyzing ICFG id_o100.c [2020-07-20 11:15:25,525 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-20 11:15:25,534 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-20 11:15:25,551 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-20 11:15:25,584 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-20 11:15:25,585 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-20 11:15:25,585 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-20 11:15:25,585 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-20 11:15:25,585 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-20 11:15:25,585 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-20 11:15:25,586 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-20 11:15:25,586 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-20 11:15:25,607 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states. [2020-07-20 11:15:25,616 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-07-20 11:15:25,616 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:15:25,618 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:15:25,619 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:15:25,628 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:15:25,629 INFO L82 PathProgramCache]: Analyzing trace with hash -872342019, now seen corresponding path program 1 times [2020-07-20 11:15:25,639 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:15:25,640 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1991403625] [2020-07-20 11:15:25,640 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 11:15:25,716 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:15:25,720 INFO L263 TraceCheckSpWp]: Trace formula consists of 30 conjuncts, 7 conjunts are in the unsatisfiable core [2020-07-20 11:15:25,730 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:15:25,924 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 11:15:25,924 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 11:15:25,926 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1991403625] [2020-07-20 11:15:25,927 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 11:15:25,928 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-20 11:15:25,930 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1958878077] [2020-07-20 11:15:25,937 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-20 11:15:25,938 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:15:25,958 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-20 11:15:25,959 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-20 11:15:25,963 INFO L87 Difference]: Start difference. First operand 20 states. Second operand 5 states. [2020-07-20 11:15:26,041 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:15:26,042 INFO L93 Difference]: Finished difference Result 32 states and 35 transitions. [2020-07-20 11:15:26,043 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-20 11:15:26,045 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2020-07-20 11:15:26,046 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:15:26,062 INFO L225 Difference]: With dead ends: 32 [2020-07-20 11:15:26,063 INFO L226 Difference]: Without dead ends: 18 [2020-07-20 11:15:26,068 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-20 11:15:26,091 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2020-07-20 11:15:26,127 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2020-07-20 11:15:26,129 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2020-07-20 11:15:26,131 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 19 transitions. [2020-07-20 11:15:26,134 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 19 transitions. Word has length 13 [2020-07-20 11:15:26,135 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:15:26,135 INFO L479 AbstractCegarLoop]: Abstraction has 18 states and 19 transitions. [2020-07-20 11:15:26,135 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-20 11:15:26,136 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 19 transitions. [2020-07-20 11:15:26,138 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-07-20 11:15:26,138 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:15:26,139 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:15:26,354 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:15:26,354 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:15:26,355 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:15:26,355 INFO L82 PathProgramCache]: Analyzing trace with hash -953570577, now seen corresponding path program 1 times [2020-07-20 11:15:26,356 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:15:26,356 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1385980942] [2020-07-20 11:15:26,357 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 11:15:26,397 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:15:26,399 INFO L263 TraceCheckSpWp]: Trace formula consists of 42 conjuncts, 11 conjunts are in the unsatisfiable core [2020-07-20 11:15:26,402 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:15:26,497 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-07-20 11:15:26,498 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:15:26,775 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-07-20 11:15:26,776 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1385980942] [2020-07-20 11:15:26,777 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:15:26,777 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 12 [2020-07-20 11:15:26,778 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1379546361] [2020-07-20 11:15:26,780 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-20 11:15:26,781 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:15:26,781 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-20 11:15:26,782 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=104, Unknown=0, NotChecked=0, Total=132 [2020-07-20 11:15:26,782 INFO L87 Difference]: Start difference. First operand 18 states and 19 transitions. Second operand 12 states. [2020-07-20 11:15:26,915 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:15:26,916 INFO L93 Difference]: Finished difference Result 30 states and 32 transitions. [2020-07-20 11:15:26,916 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-20 11:15:26,917 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 19 [2020-07-20 11:15:26,917 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:15:26,918 INFO L225 Difference]: With dead ends: 30 [2020-07-20 11:15:26,918 INFO L226 Difference]: Without dead ends: 24 [2020-07-20 11:15:26,920 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 27 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=28, Invalid=104, Unknown=0, NotChecked=0, Total=132 [2020-07-20 11:15:26,921 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2020-07-20 11:15:26,928 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2020-07-20 11:15:26,928 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2020-07-20 11:15:26,929 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 25 transitions. [2020-07-20 11:15:26,930 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 25 transitions. Word has length 19 [2020-07-20 11:15:26,931 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:15:26,931 INFO L479 AbstractCegarLoop]: Abstraction has 24 states and 25 transitions. [2020-07-20 11:15:26,931 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-20 11:15:26,931 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 25 transitions. [2020-07-20 11:15:26,933 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2020-07-20 11:15:26,933 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:15:26,933 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:15:27,149 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:15:27,151 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:15:27,152 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:15:27,152 INFO L82 PathProgramCache]: Analyzing trace with hash 1198310127, now seen corresponding path program 2 times [2020-07-20 11:15:27,152 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:15:27,153 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1530369856] [2020-07-20 11:15:27,153 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 11:15:27,204 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:15:27,207 INFO L263 TraceCheckSpWp]: Trace formula consists of 66 conjuncts, 19 conjunts are in the unsatisfiable core [2020-07-20 11:15:27,211 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:15:27,358 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2020-07-20 11:15:27,359 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:15:30,103 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 13 refuted. 2 times theorem prover too weak. 15 trivial. 0 not checked. [2020-07-20 11:15:30,103 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1530369856] [2020-07-20 11:15:30,104 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:15:30,104 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 20 [2020-07-20 11:15:30,104 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [745754168] [2020-07-20 11:15:30,105 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-07-20 11:15:30,106 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:15:30,106 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-07-20 11:15:30,107 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=64, Invalid=315, Unknown=1, NotChecked=0, Total=380 [2020-07-20 11:15:30,107 INFO L87 Difference]: Start difference. First operand 24 states and 25 transitions. Second operand 20 states. [2020-07-20 11:15:32,394 WARN L193 SmtUtils]: Spent 2.11 s on a formula simplification. DAG size of input: 18 DAG size of output: 13 [2020-07-20 11:15:32,719 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:15:32,719 INFO L93 Difference]: Finished difference Result 42 states and 46 transitions. [2020-07-20 11:15:32,720 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-07-20 11:15:32,720 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 31 [2020-07-20 11:15:32,721 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:15:32,722 INFO L225 Difference]: With dead ends: 42 [2020-07-20 11:15:32,723 INFO L226 Difference]: Without dead ends: 36 [2020-07-20 11:15:32,724 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 43 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 33 ImplicationChecksByTransitivity, 4.9s TimeCoverageRelationStatistics Valid=98, Invalid=453, Unknown=1, NotChecked=0, Total=552 [2020-07-20 11:15:32,725 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2020-07-20 11:15:32,733 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2020-07-20 11:15:32,733 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-07-20 11:15:32,735 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 37 transitions. [2020-07-20 11:15:32,736 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 37 transitions. Word has length 31 [2020-07-20 11:15:32,736 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:15:32,736 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 37 transitions. [2020-07-20 11:15:32,737 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-07-20 11:15:32,737 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 37 transitions. [2020-07-20 11:15:32,739 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2020-07-20 11:15:32,739 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:15:32,740 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:15:32,954 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:15:32,956 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:15:32,956 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:15:32,957 INFO L82 PathProgramCache]: Analyzing trace with hash 1532150511, now seen corresponding path program 3 times [2020-07-20 11:15:32,957 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:15:32,958 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1331326246] [2020-07-20 11:15:32,958 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 11:15:33,003 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:15:33,005 INFO L263 TraceCheckSpWp]: Trace formula consists of 114 conjuncts, 35 conjunts are in the unsatisfiable core [2020-07-20 11:15:33,009 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:15:33,297 INFO L134 CoverageAnalysis]: Checked inductivity of 154 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2020-07-20 11:15:33,298 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:15:36,999 INFO L134 CoverageAnalysis]: Checked inductivity of 154 backedges. 0 proven. 75 refuted. 2 times theorem prover too weak. 77 trivial. 0 not checked. [2020-07-20 11:15:37,000 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1331326246] [2020-07-20 11:15:37,000 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:15:37,001 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19] total 36 [2020-07-20 11:15:37,001 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [247134422] [2020-07-20 11:15:37,002 INFO L459 AbstractCegarLoop]: Interpolant automaton has 36 states [2020-07-20 11:15:37,002 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:15:37,002 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2020-07-20 11:15:37,003 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=184, Invalid=1075, Unknown=1, NotChecked=0, Total=1260 [2020-07-20 11:15:37,003 INFO L87 Difference]: Start difference. First operand 36 states and 37 transitions. Second operand 36 states. [2020-07-20 11:15:39,734 WARN L193 SmtUtils]: Spent 2.18 s on a formula simplification. DAG size of input: 38 DAG size of output: 13 [2020-07-20 11:15:42,277 WARN L193 SmtUtils]: Spent 2.22 s on a formula simplification. DAG size of input: 36 DAG size of output: 11 [2020-07-20 11:15:45,326 WARN L193 SmtUtils]: Spent 2.21 s on a formula simplification. DAG size of input: 31 DAG size of output: 11 [2020-07-20 11:15:52,998 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:15:52,998 INFO L93 Difference]: Finished difference Result 66 states and 74 transitions. [2020-07-20 11:15:52,999 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2020-07-20 11:15:53,000 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 55 [2020-07-20 11:15:53,001 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:15:53,003 INFO L225 Difference]: With dead ends: 66 [2020-07-20 11:15:53,003 INFO L226 Difference]: Without dead ends: 60 [2020-07-20 11:15:53,005 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 121 GetRequests, 75 SyntacticMatches, 0 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 154 ImplicationChecksByTransitivity, 18.8s TimeCoverageRelationStatistics Valid=381, Invalid=1872, Unknown=3, NotChecked=0, Total=2256 [2020-07-20 11:15:53,005 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2020-07-20 11:15:53,021 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 60. [2020-07-20 11:15:53,021 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 60 states. [2020-07-20 11:15:53,023 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 61 transitions. [2020-07-20 11:15:53,023 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 61 transitions. Word has length 55 [2020-07-20 11:15:53,024 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:15:53,024 INFO L479 AbstractCegarLoop]: Abstraction has 60 states and 61 transitions. [2020-07-20 11:15:53,024 INFO L480 AbstractCegarLoop]: Interpolant automaton has 36 states. [2020-07-20 11:15:53,024 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 61 transitions. [2020-07-20 11:15:53,028 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 104 [2020-07-20 11:15:53,028 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:15:53,028 INFO L422 BasicCegarLoop]: trace histogram [16, 16, 15, 15, 15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:15:53,242 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:15:53,243 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:15:53,243 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:15:53,244 INFO L82 PathProgramCache]: Analyzing trace with hash 1083048687, now seen corresponding path program 4 times [2020-07-20 11:15:53,244 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:15:53,245 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1026322604] [2020-07-20 11:15:53,245 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 11:15:53,295 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:15:53,297 INFO L263 TraceCheckSpWp]: Trace formula consists of 210 conjuncts, 67 conjunts are in the unsatisfiable core [2020-07-20 11:15:53,303 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:15:53,996 INFO L134 CoverageAnalysis]: Checked inductivity of 690 backedges. 0 proven. 345 refuted. 0 times theorem prover too weak. 345 trivial. 0 not checked. [2020-07-20 11:15:53,996 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:16:13,846 INFO L134 CoverageAnalysis]: Checked inductivity of 690 backedges. 0 proven. 339 refuted. 6 times theorem prover too weak. 345 trivial. 0 not checked. [2020-07-20 11:16:13,846 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1026322604] [2020-07-20 11:16:13,847 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:16:13,847 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 35] total 68 [2020-07-20 11:16:13,847 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [36280283] [2020-07-20 11:16:13,848 INFO L459 AbstractCegarLoop]: Interpolant automaton has 68 states [2020-07-20 11:16:13,848 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:16:13,849 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 68 interpolants. [2020-07-20 11:16:13,851 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=616, Invalid=3933, Unknown=7, NotChecked=0, Total=4556 [2020-07-20 11:16:13,851 INFO L87 Difference]: Start difference. First operand 60 states and 61 transitions. Second operand 68 states. [2020-07-20 11:16:18,495 WARN L193 SmtUtils]: Spent 406.00 ms on a formula simplification. DAG size of input: 78 DAG size of output: 13 [2020-07-20 11:16:24,406 WARN L193 SmtUtils]: Spent 488.00 ms on a formula simplification. DAG size of input: 76 DAG size of output: 11 [2020-07-20 11:16:30,487 WARN L193 SmtUtils]: Spent 298.00 ms on a formula simplification. DAG size of input: 73 DAG size of output: 13 [2020-07-20 11:16:36,715 WARN L193 SmtUtils]: Spent 462.00 ms on a formula simplification. DAG size of input: 71 DAG size of output: 11 [2020-07-20 11:16:41,559 WARN L193 SmtUtils]: Spent 351.00 ms on a formula simplification. DAG size of input: 68 DAG size of output: 13 [2020-07-20 11:16:45,455 WARN L193 SmtUtils]: Spent 300.00 ms on a formula simplification. DAG size of input: 66 DAG size of output: 11 [2020-07-20 11:16:49,563 WARN L193 SmtUtils]: Spent 335.00 ms on a formula simplification. DAG size of input: 63 DAG size of output: 13 [2020-07-20 11:16:53,822 WARN L193 SmtUtils]: Spent 344.00 ms on a formula simplification. DAG size of input: 61 DAG size of output: 11 [2020-07-20 11:17:01,762 WARN L193 SmtUtils]: Spent 217.00 ms on a formula simplification. DAG size of input: 58 DAG size of output: 13 [2020-07-20 11:17:09,906 WARN L193 SmtUtils]: Spent 197.00 ms on a formula simplification. DAG size of input: 56 DAG size of output: 11 [2020-07-20 11:17:14,558 WARN L193 SmtUtils]: Spent 168.00 ms on a formula simplification. DAG size of input: 53 DAG size of output: 13 [2020-07-20 11:17:21,039 WARN L193 SmtUtils]: Spent 368.00 ms on a formula simplification. DAG size of input: 51 DAG size of output: 11 [2020-07-20 11:17:25,749 WARN L193 SmtUtils]: Spent 167.00 ms on a formula simplification. DAG size of input: 48 DAG size of output: 13 [2020-07-20 11:17:33,518 WARN L193 SmtUtils]: Spent 171.00 ms on a formula simplification. DAG size of input: 46 DAG size of output: 11 [2020-07-20 11:17:36,104 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 43 DAG size of output: 13 [2020-07-20 11:17:44,465 WARN L193 SmtUtils]: Spent 151.00 ms on a formula simplification. DAG size of input: 41 DAG size of output: 11 [2020-07-20 11:17:48,263 WARN L193 SmtUtils]: Spent 161.00 ms on a formula simplification. DAG size of input: 38 DAG size of output: 13 [2020-07-20 11:17:53,640 WARN L193 SmtUtils]: Spent 2.19 s on a formula simplification. DAG size of input: 36 DAG size of output: 11 [2020-07-20 11:17:58,404 WARN L193 SmtUtils]: Spent 115.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 11 [2020-07-20 11:18:43,441 WARN L193 SmtUtils]: Spent 2.09 s on a formula simplification that was a NOOP. DAG size: 13 [2020-07-20 11:18:50,571 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:18:50,571 INFO L93 Difference]: Finished difference Result 114 states and 130 transitions. [2020-07-20 11:18:50,572 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 67 states. [2020-07-20 11:18:50,573 INFO L78 Accepts]: Start accepts. Automaton has 68 states. Word has length 103 [2020-07-20 11:18:50,574 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:18:50,578 INFO L225 Difference]: With dead ends: 114 [2020-07-20 11:18:50,578 INFO L226 Difference]: Without dead ends: 108 [2020-07-20 11:18:50,581 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 233 GetRequests, 139 SyntacticMatches, 0 SemanticMatches, 94 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 701 ImplicationChecksByTransitivity, 171.9s TimeCoverageRelationStatistics Valid=1518, Invalid=7576, Unknown=26, NotChecked=0, Total=9120 [2020-07-20 11:18:50,582 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 108 states. [2020-07-20 11:18:50,598 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 108 to 108. [2020-07-20 11:18:50,599 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 108 states. [2020-07-20 11:18:50,601 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 108 states to 108 states and 109 transitions. [2020-07-20 11:18:50,602 INFO L78 Accepts]: Start accepts. Automaton has 108 states and 109 transitions. Word has length 103 [2020-07-20 11:18:50,602 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:18:50,603 INFO L479 AbstractCegarLoop]: Abstraction has 108 states and 109 transitions. [2020-07-20 11:18:50,603 INFO L480 AbstractCegarLoop]: Interpolant automaton has 68 states. [2020-07-20 11:18:50,603 INFO L276 IsEmpty]: Start isEmpty. Operand 108 states and 109 transitions. [2020-07-20 11:18:50,607 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 200 [2020-07-20 11:18:50,608 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:18:50,608 INFO L422 BasicCegarLoop]: trace histogram [32, 32, 31, 31, 31, 31, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:18:50,809 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:18:50,810 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:18:50,811 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:18:50,811 INFO L82 PathProgramCache]: Analyzing trace with hash -935230737, now seen corresponding path program 5 times [2020-07-20 11:18:50,812 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:18:50,812 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [230404589] [2020-07-20 11:18:50,813 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 11:18:50,934 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:18:50,941 INFO L263 TraceCheckSpWp]: Trace formula consists of 402 conjuncts, 131 conjunts are in the unsatisfiable core [2020-07-20 11:18:50,952 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:18:54,715 INFO L134 CoverageAnalysis]: Checked inductivity of 2914 backedges. 0 proven. 1457 refuted. 0 times theorem prover too weak. 1457 trivial. 0 not checked. [2020-07-20 11:18:54,715 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:21:16,219 INFO L134 CoverageAnalysis]: Checked inductivity of 2914 backedges. 0 proven. 1405 refuted. 52 times theorem prover too weak. 1457 trivial. 0 not checked. [2020-07-20 11:21:16,220 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [230404589] [2020-07-20 11:21:16,220 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:21:16,221 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [67, 67] total 132 [2020-07-20 11:21:16,221 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1916765656] [2020-07-20 11:21:16,224 INFO L459 AbstractCegarLoop]: Interpolant automaton has 132 states [2020-07-20 11:21:16,225 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:21:16,227 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 132 interpolants. [2020-07-20 11:21:16,232 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2248, Invalid=14991, Unknown=53, NotChecked=0, Total=17292 [2020-07-20 11:21:16,233 INFO L87 Difference]: Start difference. First operand 108 states and 109 transitions. Second operand 132 states. [2020-07-20 11:22:14,931 WARN L193 SmtUtils]: Spent 6.83 s on a formula simplification. DAG size of input: 158 DAG size of output: 13 [2020-07-20 11:23:06,096 WARN L193 SmtUtils]: Spent 3.90 s on a formula simplification. DAG size of input: 156 DAG size of output: 11 [2020-07-20 11:24:05,636 WARN L193 SmtUtils]: Spent 4.04 s on a formula simplification. DAG size of input: 153 DAG size of output: 13 [2020-07-20 11:24:54,933 WARN L193 SmtUtils]: Spent 3.73 s on a formula simplification. DAG size of input: 151 DAG size of output: 11 [2020-07-20 11:25:49,488 WARN L193 SmtUtils]: Spent 5.11 s on a formula simplification. DAG size of input: 148 DAG size of output: 13 [2020-07-20 11:26:47,392 WARN L193 SmtUtils]: Spent 8.27 s on a formula simplification. DAG size of input: 146 DAG size of output: 11 [2020-07-20 11:27:39,889 WARN L193 SmtUtils]: Spent 6.32 s on a formula simplification. DAG size of input: 143 DAG size of output: 13 [2020-07-20 11:28:28,651 WARN L193 SmtUtils]: Spent 2.17 s on a formula simplification. DAG size of input: 141 DAG size of output: 11 [2020-07-20 11:29:21,456 WARN L193 SmtUtils]: Spent 5.27 s on a formula simplification. DAG size of input: 138 DAG size of output: 13