/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/recursive-simple/fibo_2calls_5-2.c -------------------------------------------------------------------------------- This is Ultimate 0.2.0-7d8eed3 [2020-11-06 22:16:13,511 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-11-06 22:16:13,515 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-11-06 22:16:13,569 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-11-06 22:16:13,570 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-11-06 22:16:13,574 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-11-06 22:16:13,578 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-11-06 22:16:13,586 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-11-06 22:16:13,589 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-11-06 22:16:13,595 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-11-06 22:16:13,597 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-11-06 22:16:13,598 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-11-06 22:16:13,599 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-11-06 22:16:13,602 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-11-06 22:16:13,604 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-11-06 22:16:13,606 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-11-06 22:16:13,607 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-11-06 22:16:13,610 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-11-06 22:16:13,617 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-11-06 22:16:13,625 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-11-06 22:16:13,627 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-11-06 22:16:13,629 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-11-06 22:16:13,630 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-11-06 22:16:13,633 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-11-06 22:16:13,642 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-11-06 22:16:13,672 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-11-06 22:16:13,673 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-11-06 22:16:13,674 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-11-06 22:16:13,675 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 [2020-11-06 22:16:13,733 INFO L113 SettingsManager]: Loading preferences was successful [2020-11-06 22:16:13,733 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-11-06 22:16:13,738 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-11-06 22:16:13,739 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-11-06 22:16:13,739 INFO L138 SettingsManager]: * Use SBE=true [2020-11-06 22:16:13,739 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-11-06 22:16:13,739 INFO L138 SettingsManager]: * sizeof long=4 [2020-11-06 22:16:13,739 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-11-06 22:16:13,740 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-11-06 22:16:13,740 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-11-06 22:16:13,741 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-11-06 22:16:13,742 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-11-06 22:16:13,742 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-11-06 22:16:13,742 INFO L138 SettingsManager]: * sizeof long double=12 [2020-11-06 22:16:13,742 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-11-06 22:16:13,742 INFO L138 SettingsManager]: * Use constant arrays=true [2020-11-06 22:16:13,743 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-11-06 22:16:13,743 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-11-06 22:16:13,743 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-11-06 22:16:13,743 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-11-06 22:16:13,744 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-11-06 22:16:13,744 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-11-06 22:16:13,744 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-11-06 22:16:13,744 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-11-06 22:16:13,744 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-11-06 22:16:13,745 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-11-06 22:16:13,745 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-11-06 22:16:13,745 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-11-06 22:16:13,745 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-11-06 22:16:13,745 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release [2020-11-06 22:16:14,148 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-11-06 22:16:14,180 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-11-06 22:16:14,184 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-11-06 22:16:14,185 INFO L271 PluginConnector]: Initializing CDTParser... [2020-11-06 22:16:14,186 INFO L275 PluginConnector]: CDTParser initialized [2020-11-06 22:16:14,187 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive-simple/fibo_2calls_5-2.c [2020-11-06 22:16:14,265 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/0e7ea05c6/6c2ee70273b44f7c9d1ea90c3279002f/FLAGc64ba91ee [2020-11-06 22:16:14,876 INFO L306 CDTParser]: Found 1 translation units. [2020-11-06 22:16:14,876 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/recursive-simple/fibo_2calls_5-2.c [2020-11-06 22:16:14,884 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/0e7ea05c6/6c2ee70273b44f7c9d1ea90c3279002f/FLAGc64ba91ee [2020-11-06 22:16:15,235 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/0e7ea05c6/6c2ee70273b44f7c9d1ea90c3279002f [2020-11-06 22:16:15,239 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-11-06 22:16:15,247 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-11-06 22:16:15,252 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-11-06 22:16:15,253 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-11-06 22:16:15,257 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-11-06 22:16:15,259 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.11 10:16:15" (1/1) ... [2020-11-06 22:16:15,264 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@dd021e2 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 10:16:15, skipping insertion in model container [2020-11-06 22:16:15,264 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.11 10:16:15" (1/1) ... [2020-11-06 22:16:15,274 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-11-06 22:16:15,296 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-11-06 22:16:15,467 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-11-06 22:16:15,479 INFO L203 MainTranslator]: Completed pre-run [2020-11-06 22:16:15,500 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-11-06 22:16:15,518 INFO L208 MainTranslator]: Completed translation [2020-11-06 22:16:15,518 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 10:16:15 WrapperNode [2020-11-06 22:16:15,518 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-11-06 22:16:15,520 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-11-06 22:16:15,521 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-11-06 22:16:15,521 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-11-06 22:16:15,537 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 10:16:15" (1/1) ... [2020-11-06 22:16:15,537 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 10:16:15" (1/1) ... [2020-11-06 22:16:15,546 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 10:16:15" (1/1) ... [2020-11-06 22:16:15,546 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 10:16:15" (1/1) ... [2020-11-06 22:16:15,553 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 10:16:15" (1/1) ... [2020-11-06 22:16:15,555 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 10:16:15" (1/1) ... [2020-11-06 22:16:15,557 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 10:16:15" (1/1) ... [2020-11-06 22:16:15,559 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-11-06 22:16:15,561 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-11-06 22:16:15,568 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-11-06 22:16:15,568 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-11-06 22:16:15,570 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 10:16:15" (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 [2020-11-06 22:16:15,657 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-11-06 22:16:15,657 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-11-06 22:16:15,657 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2020-11-06 22:16:15,657 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo1 [2020-11-06 22:16:15,657 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo2 [2020-11-06 22:16:15,658 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-11-06 22:16:15,658 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-11-06 22:16:15,658 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-11-06 22:16:15,658 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2020-11-06 22:16:15,658 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2020-11-06 22:16:15,658 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-11-06 22:16:15,659 INFO L130 BoogieDeclarations]: Found specification of procedure fibo1 [2020-11-06 22:16:15,659 INFO L130 BoogieDeclarations]: Found specification of procedure fibo2 [2020-11-06 22:16:15,659 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-11-06 22:16:15,659 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-11-06 22:16:15,659 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2020-11-06 22:16:15,659 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-11-06 22:16:15,660 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-11-06 22:16:15,660 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-11-06 22:16:15,660 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-11-06 22:16:16,121 INFO L293 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-11-06 22:16:16,121 INFO L298 CfgBuilder]: Removed 0 assume(true) statements. [2020-11-06 22:16:16,123 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.11 10:16:16 BoogieIcfgContainer [2020-11-06 22:16:16,123 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-11-06 22:16:16,125 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-11-06 22:16:16,126 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-11-06 22:16:16,144 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-11-06 22:16:16,145 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 06.11 10:16:15" (1/3) ... [2020-11-06 22:16:16,146 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2e3957ec and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.11 10:16:16, skipping insertion in model container [2020-11-06 22:16:16,146 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 10:16:15" (2/3) ... [2020-11-06 22:16:16,146 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2e3957ec and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.11 10:16:16, skipping insertion in model container [2020-11-06 22:16:16,147 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.11 10:16:16" (3/3) ... [2020-11-06 22:16:16,149 INFO L111 eAbstractionObserver]: Analyzing ICFG fibo_2calls_5-2.c [2020-11-06 22:16:16,169 INFO L179 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2020-11-06 22:16:16,174 INFO L191 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-11-06 22:16:16,191 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-11-06 22:16:16,241 INFO L377 AbstractCegarLoop]: Interprodecural is true [2020-11-06 22:16:16,241 INFO L378 AbstractCegarLoop]: Hoare is true [2020-11-06 22:16:16,241 INFO L379 AbstractCegarLoop]: Compute interpolants for FPandBP [2020-11-06 22:16:16,242 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-11-06 22:16:16,242 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-11-06 22:16:16,242 INFO L382 AbstractCegarLoop]: Difference is false [2020-11-06 22:16:16,242 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-11-06 22:16:16,242 INFO L387 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-11-06 22:16:16,272 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states. [2020-11-06 22:16:16,283 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2020-11-06 22:16:16,284 INFO L414 BasicCegarLoop]: Found error trace [2020-11-06 22:16:16,285 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-06 22:16:16,286 INFO L429 AbstractCegarLoop]: === Iteration 1 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-06 22:16:16,298 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-06 22:16:16,298 INFO L82 PathProgramCache]: Analyzing trace with hash 219823047, now seen corresponding path program 1 times [2020-11-06 22:16:16,312 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-06 22:16:16,313 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1905837284] [2020-11-06 22:16:16,313 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-06 22:16:16,519 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:16:16,730 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-06 22:16:16,740 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:16:16,767 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-11-06 22:16:16,775 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:16:16,823 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-06 22:16:16,824 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1905837284] [2020-11-06 22:16:16,825 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-11-06 22:16:16,826 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2020-11-06 22:16:16,828 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1531733904] [2020-11-06 22:16:16,835 INFO L461 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-11-06 22:16:16,836 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-11-06 22:16:16,853 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-11-06 22:16:16,854 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2020-11-06 22:16:16,856 INFO L87 Difference]: Start difference. First operand 38 states. Second operand 6 states. [2020-11-06 22:16:17,299 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-06 22:16:17,300 INFO L93 Difference]: Finished difference Result 53 states and 63 transitions. [2020-11-06 22:16:17,300 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-11-06 22:16:17,302 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 15 [2020-11-06 22:16:17,303 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-06 22:16:17,313 INFO L225 Difference]: With dead ends: 53 [2020-11-06 22:16:17,314 INFO L226 Difference]: Without dead ends: 32 [2020-11-06 22:16:17,318 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=21, Invalid=51, Unknown=0, NotChecked=0, Total=72 [2020-11-06 22:16:17,340 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-11-06 22:16:17,385 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32. [2020-11-06 22:16:17,387 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2020-11-06 22:16:17,389 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 39 transitions. [2020-11-06 22:16:17,394 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 39 transitions. Word has length 15 [2020-11-06 22:16:17,395 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-06 22:16:17,395 INFO L481 AbstractCegarLoop]: Abstraction has 32 states and 39 transitions. [2020-11-06 22:16:17,395 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-11-06 22:16:17,395 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 39 transitions. [2020-11-06 22:16:17,401 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-11-06 22:16:17,402 INFO L414 BasicCegarLoop]: Found error trace [2020-11-06 22:16:17,402 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-06 22:16:17,402 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-11-06 22:16:17,404 INFO L429 AbstractCegarLoop]: === Iteration 2 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-06 22:16:17,405 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-06 22:16:17,405 INFO L82 PathProgramCache]: Analyzing trace with hash -1220716726, now seen corresponding path program 1 times [2020-11-06 22:16:17,406 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-06 22:16:17,406 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [598949779] [2020-11-06 22:16:17,406 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-06 22:16:17,443 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:16:17,577 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-06 22:16:17,588 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:16:17,605 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-11-06 22:16:17,611 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:16:17,636 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-06 22:16:17,637 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [598949779] [2020-11-06 22:16:17,637 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-11-06 22:16:17,637 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2020-11-06 22:16:17,638 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2019866483] [2020-11-06 22:16:17,639 INFO L461 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-11-06 22:16:17,640 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-11-06 22:16:17,640 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-11-06 22:16:17,641 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2020-11-06 22:16:17,641 INFO L87 Difference]: Start difference. First operand 32 states and 39 transitions. Second operand 6 states. [2020-11-06 22:16:17,934 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-06 22:16:17,934 INFO L93 Difference]: Finished difference Result 39 states and 47 transitions. [2020-11-06 22:16:17,935 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-11-06 22:16:17,935 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 16 [2020-11-06 22:16:17,936 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-06 22:16:17,937 INFO L225 Difference]: With dead ends: 39 [2020-11-06 22:16:17,938 INFO L226 Difference]: Without dead ends: 34 [2020-11-06 22:16:17,939 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=21, Invalid=51, Unknown=0, NotChecked=0, Total=72 [2020-11-06 22:16:17,940 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2020-11-06 22:16:17,950 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 32. [2020-11-06 22:16:17,951 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2020-11-06 22:16:17,953 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 39 transitions. [2020-11-06 22:16:17,953 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 39 transitions. Word has length 16 [2020-11-06 22:16:17,953 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-06 22:16:17,954 INFO L481 AbstractCegarLoop]: Abstraction has 32 states and 39 transitions. [2020-11-06 22:16:17,954 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-11-06 22:16:17,954 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 39 transitions. [2020-11-06 22:16:17,960 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-11-06 22:16:17,960 INFO L414 BasicCegarLoop]: Found error trace [2020-11-06 22:16:17,960 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, 1, 1, 1] [2020-11-06 22:16:17,961 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-11-06 22:16:17,961 INFO L429 AbstractCegarLoop]: === Iteration 3 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-06 22:16:17,962 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-06 22:16:17,962 INFO L82 PathProgramCache]: Analyzing trace with hash 2083135015, now seen corresponding path program 1 times [2020-11-06 22:16:17,963 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-06 22:16:17,964 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1816961303] [2020-11-06 22:16:17,964 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-06 22:16:18,010 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:16:18,088 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-06 22:16:18,096 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:16:18,110 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-11-06 22:16:18,127 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:16:18,168 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-11-06 22:16:18,171 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:16:18,202 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 9 [2020-11-06 22:16:18,204 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:16:18,217 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-11-06 22:16:18,220 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1816961303] [2020-11-06 22:16:18,221 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1003643472] [2020-11-06 22:16:18,221 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 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-11-06 22:16:18,314 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:16:18,317 INFO L263 TraceCheckSpWp]: Trace formula consists of 126 conjuncts, 6 conjunts are in the unsatisfiable core [2020-11-06 22:16:18,326 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-06 22:16:18,469 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-11-06 22:16:18,469 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-11-06 22:16:18,470 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 11 [2020-11-06 22:16:18,470 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1927653843] [2020-11-06 22:16:18,471 INFO L461 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-11-06 22:16:18,471 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-11-06 22:16:18,472 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-11-06 22:16:18,472 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=89, Unknown=0, NotChecked=0, Total=110 [2020-11-06 22:16:18,472 INFO L87 Difference]: Start difference. First operand 32 states and 39 transitions. Second operand 11 states. [2020-11-06 22:16:19,099 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-06 22:16:19,100 INFO L93 Difference]: Finished difference Result 61 states and 81 transitions. [2020-11-06 22:16:19,100 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-11-06 22:16:19,101 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 28 [2020-11-06 22:16:19,101 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-06 22:16:19,102 INFO L225 Difference]: With dead ends: 61 [2020-11-06 22:16:19,103 INFO L226 Difference]: Without dead ends: 36 [2020-11-06 22:16:19,104 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 51 GetRequests, 33 SyntacticMatches, 1 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 34 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=70, Invalid=272, Unknown=0, NotChecked=0, Total=342 [2020-11-06 22:16:19,104 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2020-11-06 22:16:19,113 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 34. [2020-11-06 22:16:19,113 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2020-11-06 22:16:19,114 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 41 transitions. [2020-11-06 22:16:19,115 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 41 transitions. Word has length 28 [2020-11-06 22:16:19,115 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-06 22:16:19,115 INFO L481 AbstractCegarLoop]: Abstraction has 34 states and 41 transitions. [2020-11-06 22:16:19,115 INFO L482 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-11-06 22:16:19,115 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 41 transitions. [2020-11-06 22:16:19,117 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2020-11-06 22:16:19,117 INFO L414 BasicCegarLoop]: Found error trace [2020-11-06 22:16:19,117 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-06 22:16:19,330 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2 [2020-11-06 22:16:19,331 INFO L429 AbstractCegarLoop]: === Iteration 4 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-06 22:16:19,332 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-06 22:16:19,333 INFO L82 PathProgramCache]: Analyzing trace with hash 752879968, now seen corresponding path program 1 times [2020-11-06 22:16:19,333 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-06 22:16:19,334 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1569930248] [2020-11-06 22:16:19,334 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-06 22:16:19,349 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:16:19,435 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-06 22:16:19,437 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:16:19,443 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-11-06 22:16:19,450 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:16:19,473 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-11-06 22:16:19,476 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:16:19,502 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2020-11-06 22:16:19,504 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:16:19,509 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-11-06 22:16:19,510 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1569930248] [2020-11-06 22:16:19,510 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1646798165] [2020-11-06 22:16:19,511 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 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-11-06 22:16:19,564 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:16:19,566 INFO L263 TraceCheckSpWp]: Trace formula consists of 128 conjuncts, 6 conjunts are in the unsatisfiable core [2020-11-06 22:16:19,568 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-06 22:16:19,630 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-11-06 22:16:19,630 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-11-06 22:16:19,631 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7] total 10 [2020-11-06 22:16:19,631 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [80674266] [2020-11-06 22:16:19,632 INFO L461 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-11-06 22:16:19,632 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-11-06 22:16:19,632 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-11-06 22:16:19,633 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=71, Unknown=0, NotChecked=0, Total=90 [2020-11-06 22:16:19,633 INFO L87 Difference]: Start difference. First operand 34 states and 41 transitions. Second operand 10 states. [2020-11-06 22:16:20,377 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-06 22:16:20,377 INFO L93 Difference]: Finished difference Result 57 states and 77 transitions. [2020-11-06 22:16:20,378 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-11-06 22:16:20,378 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 29 [2020-11-06 22:16:20,379 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-06 22:16:20,382 INFO L225 Difference]: With dead ends: 57 [2020-11-06 22:16:20,383 INFO L226 Difference]: Without dead ends: 52 [2020-11-06 22:16:20,384 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 35 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=57, Invalid=215, Unknown=0, NotChecked=0, Total=272 [2020-11-06 22:16:20,384 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2020-11-06 22:16:20,397 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 50. [2020-11-06 22:16:20,398 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 50 states. [2020-11-06 22:16:20,400 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 67 transitions. [2020-11-06 22:16:20,400 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 67 transitions. Word has length 29 [2020-11-06 22:16:20,400 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-06 22:16:20,401 INFO L481 AbstractCegarLoop]: Abstraction has 50 states and 67 transitions. [2020-11-06 22:16:20,401 INFO L482 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-11-06 22:16:20,401 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 67 transitions. [2020-11-06 22:16:20,403 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-11-06 22:16:20,403 INFO L414 BasicCegarLoop]: Found error trace [2020-11-06 22:16:20,404 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-06 22:16:20,616 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-11-06 22:16:20,617 INFO L429 AbstractCegarLoop]: === Iteration 5 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-06 22:16:20,618 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-06 22:16:20,618 INFO L82 PathProgramCache]: Analyzing trace with hash 2070859795, now seen corresponding path program 1 times [2020-11-06 22:16:20,619 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-06 22:16:20,619 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [398798796] [2020-11-06 22:16:20,619 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-06 22:16:20,642 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:16:20,714 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-06 22:16:20,717 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:16:20,723 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-11-06 22:16:20,731 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:16:20,739 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-11-06 22:16:20,743 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:16:20,766 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-11-06 22:16:20,769 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:16:20,789 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 9 [2020-11-06 22:16:20,794 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:16:20,802 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 22 [2020-11-06 22:16:20,804 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:16:20,812 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 5 proven. 5 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2020-11-06 22:16:20,812 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [398798796] [2020-11-06 22:16:20,813 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1988775312] [2020-11-06 22:16:20,813 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-11-06 22:16:20,866 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:16:20,868 INFO L263 TraceCheckSpWp]: Trace formula consists of 155 conjuncts, 8 conjunts are in the unsatisfiable core [2020-11-06 22:16:20,871 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-06 22:16:20,981 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 2 proven. 9 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-11-06 22:16:20,982 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-11-06 22:16:20,982 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 8] total 12 [2020-11-06 22:16:20,982 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [163640454] [2020-11-06 22:16:20,983 INFO L461 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-11-06 22:16:20,983 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-11-06 22:16:20,984 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-11-06 22:16:20,984 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=108, Unknown=0, NotChecked=0, Total=132 [2020-11-06 22:16:20,985 INFO L87 Difference]: Start difference. First operand 50 states and 67 transitions. Second operand 12 states. [2020-11-06 22:16:22,028 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-06 22:16:22,029 INFO L93 Difference]: Finished difference Result 111 states and 173 transitions. [2020-11-06 22:16:22,029 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-11-06 22:16:22,029 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 41 [2020-11-06 22:16:22,030 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-06 22:16:22,036 INFO L225 Difference]: With dead ends: 111 [2020-11-06 22:16:22,036 INFO L226 Difference]: Without dead ends: 68 [2020-11-06 22:16:22,039 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 76 GetRequests, 54 SyntacticMatches, 1 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 61 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=101, Invalid=405, Unknown=0, NotChecked=0, Total=506 [2020-11-06 22:16:22,041 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2020-11-06 22:16:22,077 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 68. [2020-11-06 22:16:22,077 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 68 states. [2020-11-06 22:16:22,079 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 97 transitions. [2020-11-06 22:16:22,080 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 97 transitions. Word has length 41 [2020-11-06 22:16:22,080 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-06 22:16:22,080 INFO L481 AbstractCegarLoop]: Abstraction has 68 states and 97 transitions. [2020-11-06 22:16:22,080 INFO L482 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-11-06 22:16:22,080 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 97 transitions. [2020-11-06 22:16:22,086 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2020-11-06 22:16:22,087 INFO L414 BasicCegarLoop]: Found error trace [2020-11-06 22:16:22,087 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-06 22:16:22,303 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-11-06 22:16:22,304 INFO L429 AbstractCegarLoop]: === Iteration 6 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-06 22:16:22,305 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-06 22:16:22,305 INFO L82 PathProgramCache]: Analyzing trace with hash 1960607334, now seen corresponding path program 1 times [2020-11-06 22:16:22,305 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-06 22:16:22,306 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2094526763] [2020-11-06 22:16:22,306 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-06 22:16:22,334 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:16:22,375 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-06 22:16:22,377 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:16:22,381 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-11-06 22:16:22,388 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:16:22,402 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-11-06 22:16:22,406 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:16:22,454 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-11-06 22:16:22,457 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:16:22,460 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2020-11-06 22:16:22,462 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:16:22,465 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 23 [2020-11-06 22:16:22,467 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:16:22,484 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 4 proven. 2 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2020-11-06 22:16:22,484 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2094526763] [2020-11-06 22:16:22,485 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [780427314] [2020-11-06 22:16:22,485 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 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-11-06 22:16:22,557 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:16:22,558 INFO L263 TraceCheckSpWp]: Trace formula consists of 157 conjuncts, 8 conjunts are in the unsatisfiable core [2020-11-06 22:16:22,561 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-06 22:16:22,667 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 2 proven. 9 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2020-11-06 22:16:22,668 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-11-06 22:16:22,668 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 14 [2020-11-06 22:16:22,668 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1783935686] [2020-11-06 22:16:22,669 INFO L461 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-11-06 22:16:22,669 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-11-06 22:16:22,670 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-11-06 22:16:22,670 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=152, Unknown=0, NotChecked=0, Total=182 [2020-11-06 22:16:22,670 INFO L87 Difference]: Start difference. First operand 68 states and 97 transitions. Second operand 14 states. [2020-11-06 22:16:24,077 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-06 22:16:24,078 INFO L93 Difference]: Finished difference Result 183 states and 327 transitions. [2020-11-06 22:16:24,079 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-11-06 22:16:24,079 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 42 [2020-11-06 22:16:24,080 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-06 22:16:24,084 INFO L225 Difference]: With dead ends: 183 [2020-11-06 22:16:24,084 INFO L226 Difference]: Without dead ends: 122 [2020-11-06 22:16:24,087 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 83 GetRequests, 57 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 95 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=136, Invalid=620, Unknown=0, NotChecked=0, Total=756 [2020-11-06 22:16:24,087 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 122 states. [2020-11-06 22:16:24,115 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 122 to 108. [2020-11-06 22:16:24,115 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 108 states. [2020-11-06 22:16:24,120 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 108 states to 108 states and 171 transitions. [2020-11-06 22:16:24,120 INFO L78 Accepts]: Start accepts. Automaton has 108 states and 171 transitions. Word has length 42 [2020-11-06 22:16:24,121 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-06 22:16:24,121 INFO L481 AbstractCegarLoop]: Abstraction has 108 states and 171 transitions. [2020-11-06 22:16:24,121 INFO L482 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-11-06 22:16:24,124 INFO L276 IsEmpty]: Start isEmpty. Operand 108 states and 171 transitions. [2020-11-06 22:16:24,128 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2020-11-06 22:16:24,129 INFO L414 BasicCegarLoop]: Found error trace [2020-11-06 22:16:24,133 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-06 22:16:24,334 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-11-06 22:16:24,335 INFO L429 AbstractCegarLoop]: === Iteration 7 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-06 22:16:24,335 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-06 22:16:24,336 INFO L82 PathProgramCache]: Analyzing trace with hash -751460799, now seen corresponding path program 1 times [2020-11-06 22:16:24,336 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-06 22:16:24,336 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [423914638] [2020-11-06 22:16:24,336 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-06 22:16:24,354 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:16:24,427 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-06 22:16:24,430 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:16:24,435 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-11-06 22:16:24,444 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:16:24,454 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-11-06 22:16:24,461 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:16:24,477 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-11-06 22:16:24,481 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:16:24,523 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-11-06 22:16:24,526 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:16:24,529 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2020-11-06 22:16:24,530 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:16:24,533 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 23 [2020-11-06 22:16:24,535 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:16:24,565 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 36 [2020-11-06 22:16:24,566 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:16:24,575 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 15 proven. 4 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2020-11-06 22:16:24,575 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [423914638] [2020-11-06 22:16:24,576 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [578307807] [2020-11-06 22:16:24,576 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 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-11-06 22:16:24,638 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:16:24,640 INFO L263 TraceCheckSpWp]: Trace formula consists of 188 conjuncts, 10 conjunts are in the unsatisfiable core [2020-11-06 22:16:24,643 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-06 22:16:24,809 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 4 proven. 23 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2020-11-06 22:16:24,809 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-11-06 22:16:24,810 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 15 [2020-11-06 22:16:24,810 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [956455077] [2020-11-06 22:16:24,811 INFO L461 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-11-06 22:16:24,811 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-11-06 22:16:24,811 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-11-06 22:16:24,812 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=176, Unknown=0, NotChecked=0, Total=210 [2020-11-06 22:16:24,812 INFO L87 Difference]: Start difference. First operand 108 states and 171 transitions. Second operand 15 states. [2020-11-06 22:16:26,576 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-06 22:16:26,576 INFO L93 Difference]: Finished difference Result 261 states and 501 transitions. [2020-11-06 22:16:26,577 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2020-11-06 22:16:26,577 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 56 [2020-11-06 22:16:26,578 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-06 22:16:26,584 INFO L225 Difference]: With dead ends: 261 [2020-11-06 22:16:26,584 INFO L226 Difference]: Without dead ends: 160 [2020-11-06 22:16:26,587 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 106 GetRequests, 76 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 148 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=171, Invalid=821, Unknown=0, NotChecked=0, Total=992 [2020-11-06 22:16:26,590 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 160 states. [2020-11-06 22:16:26,661 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 160 to 114. [2020-11-06 22:16:26,661 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 114 states. [2020-11-06 22:16:26,669 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 114 states to 114 states and 182 transitions. [2020-11-06 22:16:26,670 INFO L78 Accepts]: Start accepts. Automaton has 114 states and 182 transitions. Word has length 56 [2020-11-06 22:16:26,671 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-06 22:16:26,671 INFO L481 AbstractCegarLoop]: Abstraction has 114 states and 182 transitions. [2020-11-06 22:16:26,674 INFO L482 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-11-06 22:16:26,674 INFO L276 IsEmpty]: Start isEmpty. Operand 114 states and 182 transitions. [2020-11-06 22:16:26,684 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 113 [2020-11-06 22:16:26,685 INFO L414 BasicCegarLoop]: Found error trace [2020-11-06 22:16:26,685 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 7, 6, 6, 6, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-06 22:16:26,886 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2020-11-06 22:16:26,886 INFO L429 AbstractCegarLoop]: === Iteration 8 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-06 22:16:26,887 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-06 22:16:26,887 INFO L82 PathProgramCache]: Analyzing trace with hash 2107233529, now seen corresponding path program 1 times [2020-11-06 22:16:26,887 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-06 22:16:26,888 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [370029096] [2020-11-06 22:16:26,888 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-06 22:16:26,944 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:16:27,033 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-06 22:16:27,035 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:16:27,039 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-11-06 22:16:27,061 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:16:27,082 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-11-06 22:16:27,089 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:16:27,112 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-11-06 22:16:27,118 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:16:27,148 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-11-06 22:16:27,153 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:16:27,217 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-11-06 22:16:27,220 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:16:27,224 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2020-11-06 22:16:27,225 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:16:27,229 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 23 [2020-11-06 22:16:27,230 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:16:27,234 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 37 [2020-11-06 22:16:27,236 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:16:27,261 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 51 [2020-11-06 22:16:27,267 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:16:27,275 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-11-06 22:16:27,276 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:16:27,287 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-11-06 22:16:27,289 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:16:27,294 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-11-06 22:16:27,295 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:16:27,302 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2020-11-06 22:16:27,303 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:16:27,306 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 23 [2020-11-06 22:16:27,315 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:16:27,323 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 37 [2020-11-06 22:16:27,324 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:16:27,350 INFO L134 CoverageAnalysis]: Checked inductivity of 276 backedges. 44 proven. 79 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2020-11-06 22:16:27,351 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [370029096] [2020-11-06 22:16:27,351 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1316826472] [2020-11-06 22:16:27,351 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 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-11-06 22:16:27,460 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:16:27,461 INFO L263 TraceCheckSpWp]: Trace formula consists of 312 conjuncts, 8 conjunts are in the unsatisfiable core [2020-11-06 22:16:27,480 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-06 22:16:27,627 INFO L134 CoverageAnalysis]: Checked inductivity of 276 backedges. 36 proven. 58 refuted. 0 times theorem prover too weak. 182 trivial. 0 not checked. [2020-11-06 22:16:27,628 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-11-06 22:16:27,628 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 8] total 15 [2020-11-06 22:16:27,629 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [663315152] [2020-11-06 22:16:27,631 INFO L461 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-11-06 22:16:27,631 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-11-06 22:16:27,633 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-11-06 22:16:27,633 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=178, Unknown=0, NotChecked=0, Total=210 [2020-11-06 22:16:27,633 INFO L87 Difference]: Start difference. First operand 114 states and 182 transitions. Second operand 15 states. [2020-11-06 22:16:29,251 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-06 22:16:29,252 INFO L93 Difference]: Finished difference Result 247 states and 477 transitions. [2020-11-06 22:16:29,253 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-11-06 22:16:29,253 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 112 [2020-11-06 22:16:29,254 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-06 22:16:29,256 INFO L225 Difference]: With dead ends: 247 [2020-11-06 22:16:29,256 INFO L226 Difference]: Without dead ends: 125 [2020-11-06 22:16:29,259 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 172 GetRequests, 141 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 163 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=170, Invalid=886, Unknown=0, NotChecked=0, Total=1056 [2020-11-06 22:16:29,259 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 125 states. [2020-11-06 22:16:29,280 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 125 to 103. [2020-11-06 22:16:29,280 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 103 states. [2020-11-06 22:16:29,284 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 103 states to 103 states and 156 transitions. [2020-11-06 22:16:29,285 INFO L78 Accepts]: Start accepts. Automaton has 103 states and 156 transitions. Word has length 112 [2020-11-06 22:16:29,288 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-06 22:16:29,288 INFO L481 AbstractCegarLoop]: Abstraction has 103 states and 156 transitions. [2020-11-06 22:16:29,289 INFO L482 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-11-06 22:16:29,289 INFO L276 IsEmpty]: Start isEmpty. Operand 103 states and 156 transitions. [2020-11-06 22:16:29,293 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 112 [2020-11-06 22:16:29,294 INFO L414 BasicCegarLoop]: Found error trace [2020-11-06 22:16:29,294 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 6, 6, 6, 6, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-06 22:16:29,495 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-11-06 22:16:29,496 INFO L429 AbstractCegarLoop]: === Iteration 9 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-06 22:16:29,496 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-06 22:16:29,497 INFO L82 PathProgramCache]: Analyzing trace with hash -1776878894, now seen corresponding path program 2 times [2020-11-06 22:16:29,497 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-06 22:16:29,497 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1252772345] [2020-11-06 22:16:29,498 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-06 22:16:29,535 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:16:29,603 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-06 22:16:29,608 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:16:29,612 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-11-06 22:16:29,625 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:16:29,642 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-11-06 22:16:29,652 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:16:29,680 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-11-06 22:16:29,684 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:16:29,709 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-11-06 22:16:29,712 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:16:29,737 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-11-06 22:16:29,739 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:16:29,756 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2020-11-06 22:16:29,757 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:16:29,759 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 23 [2020-11-06 22:16:29,761 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:16:29,764 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 37 [2020-11-06 22:16:29,769 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:16:29,789 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-11-06 22:16:29,793 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:16:29,838 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-11-06 22:16:29,840 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:16:29,842 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2020-11-06 22:16:29,843 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:16:29,845 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 23 [2020-11-06 22:16:29,846 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:16:29,855 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 78 [2020-11-06 22:16:29,858 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:16:29,860 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-11-06 22:16:29,861 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:16:29,863 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2020-11-06 22:16:29,864 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:16:29,910 INFO L134 CoverageAnalysis]: Checked inductivity of 270 backedges. 60 proven. 94 refuted. 0 times theorem prover too weak. 116 trivial. 0 not checked. [2020-11-06 22:16:29,911 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1252772345] [2020-11-06 22:16:29,911 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [893859892] [2020-11-06 22:16:29,911 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-11-06 22:16:29,996 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2020-11-06 22:16:29,996 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-11-06 22:16:29,998 INFO L263 TraceCheckSpWp]: Trace formula consists of 310 conjuncts, 12 conjunts are in the unsatisfiable core [2020-11-06 22:16:30,002 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-06 22:16:30,166 INFO L134 CoverageAnalysis]: Checked inductivity of 270 backedges. 76 proven. 59 refuted. 0 times theorem prover too weak. 135 trivial. 0 not checked. [2020-11-06 22:16:30,167 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-11-06 22:16:30,168 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 10] total 18 [2020-11-06 22:16:30,170 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [452351627] [2020-11-06 22:16:30,172 INFO L461 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-11-06 22:16:30,172 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-11-06 22:16:30,173 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-11-06 22:16:30,173 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=264, Unknown=0, NotChecked=0, Total=306 [2020-11-06 22:16:30,173 INFO L87 Difference]: Start difference. First operand 103 states and 156 transitions. Second operand 18 states. [2020-11-06 22:16:32,507 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-06 22:16:32,507 INFO L93 Difference]: Finished difference Result 256 states and 483 transitions. [2020-11-06 22:16:32,508 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2020-11-06 22:16:32,508 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 111 [2020-11-06 22:16:32,509 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-06 22:16:32,511 INFO L225 Difference]: With dead ends: 256 [2020-11-06 22:16:32,511 INFO L226 Difference]: Without dead ends: 127 [2020-11-06 22:16:32,513 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 180 GetRequests, 139 SyntacticMatches, 0 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 372 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=268, Invalid=1538, Unknown=0, NotChecked=0, Total=1806 [2020-11-06 22:16:32,514 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 127 states. [2020-11-06 22:16:32,546 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 127 to 113. [2020-11-06 22:16:32,547 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 113 states. [2020-11-06 22:16:32,550 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 113 states to 113 states and 156 transitions. [2020-11-06 22:16:32,551 INFO L78 Accepts]: Start accepts. Automaton has 113 states and 156 transitions. Word has length 111 [2020-11-06 22:16:32,551 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-06 22:16:32,552 INFO L481 AbstractCegarLoop]: Abstraction has 113 states and 156 transitions. [2020-11-06 22:16:32,552 INFO L482 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-11-06 22:16:32,552 INFO L276 IsEmpty]: Start isEmpty. Operand 113 states and 156 transitions. [2020-11-06 22:16:32,554 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 139 [2020-11-06 22:16:32,555 INFO L414 BasicCegarLoop]: Found error trace [2020-11-06 22:16:32,555 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 9, 9, 8, 7, 5, 5, 5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 4, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-06 22:16:32,768 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-11-06 22:16:32,769 INFO L429 AbstractCegarLoop]: === Iteration 10 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-06 22:16:32,770 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-06 22:16:32,770 INFO L82 PathProgramCache]: Analyzing trace with hash -1001167155, now seen corresponding path program 1 times [2020-11-06 22:16:32,770 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-06 22:16:32,771 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1605894145] [2020-11-06 22:16:32,771 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-06 22:16:32,794 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:16:32,849 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-06 22:16:32,851 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:16:32,854 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-11-06 22:16:32,870 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:16:32,897 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-11-06 22:16:32,905 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:16:32,932 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-11-06 22:16:32,936 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:16:32,964 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-11-06 22:16:32,967 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:16:32,983 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-11-06 22:16:32,985 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:16:33,000 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2020-11-06 22:16:33,002 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:16:33,004 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 23 [2020-11-06 22:16:33,005 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:16:33,008 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 37 [2020-11-06 22:16:33,010 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:16:33,013 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-11-06 22:16:33,014 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:16:33,016 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2020-11-06 22:16:33,016 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:16:33,021 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 64 [2020-11-06 22:16:33,027 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:16:33,048 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-11-06 22:16:33,053 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:16:33,073 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-11-06 22:16:33,076 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:16:33,123 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-11-06 22:16:33,125 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:16:33,126 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2020-11-06 22:16:33,128 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:16:33,131 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 23 [2020-11-06 22:16:33,132 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:16:33,135 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 37 [2020-11-06 22:16:33,138 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:16:33,141 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-11-06 22:16:33,142 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:16:33,143 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2020-11-06 22:16:33,144 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:16:33,188 INFO L134 CoverageAnalysis]: Checked inductivity of 437 backedges. 89 proven. 150 refuted. 0 times theorem prover too weak. 198 trivial. 0 not checked. [2020-11-06 22:16:33,189 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1605894145] [2020-11-06 22:16:33,189 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [165348214] [2020-11-06 22:16:33,189 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-11-06 22:16:33,270 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:16:33,271 INFO L263 TraceCheckSpWp]: Trace formula consists of 370 conjuncts, 12 conjunts are in the unsatisfiable core [2020-11-06 22:16:33,275 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-06 22:16:33,428 INFO L134 CoverageAnalysis]: Checked inductivity of 437 backedges. 131 proven. 51 refuted. 0 times theorem prover too weak. 255 trivial. 0 not checked. [2020-11-06 22:16:33,428 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-11-06 22:16:33,429 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 10] total 19 [2020-11-06 22:16:33,429 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2128958822] [2020-11-06 22:16:33,430 INFO L461 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-11-06 22:16:33,430 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-11-06 22:16:33,430 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-11-06 22:16:33,431 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=297, Unknown=0, NotChecked=0, Total=342 [2020-11-06 22:16:33,431 INFO L87 Difference]: Start difference. First operand 113 states and 156 transitions. Second operand 19 states. [2020-11-06 22:16:35,986 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-06 22:16:35,986 INFO L93 Difference]: Finished difference Result 238 states and 365 transitions. [2020-11-06 22:16:35,987 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2020-11-06 22:16:35,987 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 138 [2020-11-06 22:16:35,987 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-06 22:16:35,992 INFO L225 Difference]: With dead ends: 238 [2020-11-06 22:16:35,992 INFO L226 Difference]: Without dead ends: 135 [2020-11-06 22:16:35,995 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 219 GetRequests, 173 SyntacticMatches, 0 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 481 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=336, Invalid=1920, Unknown=0, NotChecked=0, Total=2256 [2020-11-06 22:16:35,996 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 135 states. [2020-11-06 22:16:36,017 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 135 to 114. [2020-11-06 22:16:36,017 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 114 states. [2020-11-06 22:16:36,020 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 114 states to 114 states and 158 transitions. [2020-11-06 22:16:36,021 INFO L78 Accepts]: Start accepts. Automaton has 114 states and 158 transitions. Word has length 138 [2020-11-06 22:16:36,022 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-06 22:16:36,022 INFO L481 AbstractCegarLoop]: Abstraction has 114 states and 158 transitions. [2020-11-06 22:16:36,022 INFO L482 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-11-06 22:16:36,022 INFO L276 IsEmpty]: Start isEmpty. Operand 114 states and 158 transitions. [2020-11-06 22:16:36,024 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 98 [2020-11-06 22:16:36,024 INFO L414 BasicCegarLoop]: Found error trace [2020-11-06 22:16:36,024 INFO L422 BasicCegarLoop]: trace histogram [7, 7, 6, 6, 5, 5, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-06 22:16:36,237 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2020-11-06 22:16:36,238 INFO L429 AbstractCegarLoop]: === Iteration 11 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-06 22:16:36,239 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-06 22:16:36,239 INFO L82 PathProgramCache]: Analyzing trace with hash 605956523, now seen corresponding path program 2 times [2020-11-06 22:16:36,240 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-06 22:16:36,240 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [188878634] [2020-11-06 22:16:36,240 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-06 22:16:36,255 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:16:36,295 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-06 22:16:36,297 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:16:36,300 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-11-06 22:16:36,309 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:16:36,327 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-11-06 22:16:36,333 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:16:36,356 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-11-06 22:16:36,360 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:16:36,364 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-11-06 22:16:36,366 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:16:36,368 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-11-06 22:16:36,369 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:16:36,371 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2020-11-06 22:16:36,371 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:16:36,373 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 23 [2020-11-06 22:16:36,373 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:16:36,375 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 37 [2020-11-06 22:16:36,377 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:16:36,427 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-11-06 22:16:36,429 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:16:36,430 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2020-11-06 22:16:36,432 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:16:36,436 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 64 [2020-11-06 22:16:36,439 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:16:36,457 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-11-06 22:16:36,458 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:16:36,476 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2020-11-06 22:16:36,478 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:16:36,495 INFO L134 CoverageAnalysis]: Checked inductivity of 188 backedges. 77 proven. 24 refuted. 0 times theorem prover too weak. 87 trivial. 0 not checked. [2020-11-06 22:16:36,496 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [188878634] [2020-11-06 22:16:36,496 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [907176828] [2020-11-06 22:16:36,496 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-11-06 22:16:36,589 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2020-11-06 22:16:36,589 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-11-06 22:16:36,590 INFO L263 TraceCheckSpWp]: Trace formula consists of 279 conjuncts, 8 conjunts are in the unsatisfiable core [2020-11-06 22:16:36,593 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-06 22:16:36,670 INFO L134 CoverageAnalysis]: Checked inductivity of 188 backedges. 58 proven. 15 refuted. 0 times theorem prover too weak. 115 trivial. 0 not checked. [2020-11-06 22:16:36,670 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-11-06 22:16:36,670 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 8] total 15 [2020-11-06 22:16:36,671 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [198052784] [2020-11-06 22:16:36,672 INFO L461 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-11-06 22:16:36,672 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-11-06 22:16:36,672 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-11-06 22:16:36,673 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=178, Unknown=0, NotChecked=0, Total=210 [2020-11-06 22:16:36,673 INFO L87 Difference]: Start difference. First operand 114 states and 158 transitions. Second operand 15 states. [2020-11-06 22:16:37,831 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-06 22:16:37,831 INFO L93 Difference]: Finished difference Result 228 states and 322 transitions. [2020-11-06 22:16:37,832 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-11-06 22:16:37,832 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 97 [2020-11-06 22:16:37,832 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-06 22:16:37,834 INFO L225 Difference]: With dead ends: 228 [2020-11-06 22:16:37,834 INFO L226 Difference]: Without dead ends: 128 [2020-11-06 22:16:37,836 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 148 GetRequests, 121 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 96 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=136, Invalid=676, Unknown=0, NotChecked=0, Total=812 [2020-11-06 22:16:37,836 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 128 states. [2020-11-06 22:16:37,849 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 128 to 122. [2020-11-06 22:16:37,850 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 122 states. [2020-11-06 22:16:37,852 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 122 states to 122 states and 160 transitions. [2020-11-06 22:16:37,853 INFO L78 Accepts]: Start accepts. Automaton has 122 states and 160 transitions. Word has length 97 [2020-11-06 22:16:37,854 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-06 22:16:37,855 INFO L481 AbstractCegarLoop]: Abstraction has 122 states and 160 transitions. [2020-11-06 22:16:37,855 INFO L482 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-11-06 22:16:37,855 INFO L276 IsEmpty]: Start isEmpty. Operand 122 states and 160 transitions. [2020-11-06 22:16:37,858 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 125 [2020-11-06 22:16:37,858 INFO L414 BasicCegarLoop]: Found error trace [2020-11-06 22:16:37,859 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 7, 7, 7, 6, 5, 5, 5, 5, 5, 5, 5, 4, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-06 22:16:38,071 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,10 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-11-06 22:16:38,072 INFO L429 AbstractCegarLoop]: === Iteration 12 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-06 22:16:38,073 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-06 22:16:38,073 INFO L82 PathProgramCache]: Analyzing trace with hash -1789886746, now seen corresponding path program 3 times [2020-11-06 22:16:38,074 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-06 22:16:38,074 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1368810084] [2020-11-06 22:16:38,074 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-06 22:16:38,090 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:16:38,136 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-06 22:16:38,138 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:16:38,141 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-11-06 22:16:38,171 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:16:38,196 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-11-06 22:16:38,203 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:16:38,229 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-11-06 22:16:38,233 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:16:38,260 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-11-06 22:16:38,263 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:16:38,281 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-11-06 22:16:38,283 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:16:38,300 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2020-11-06 22:16:38,301 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:16:38,304 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 23 [2020-11-06 22:16:38,305 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:16:38,309 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 37 [2020-11-06 22:16:38,311 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:16:38,315 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-11-06 22:16:38,316 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:16:38,317 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2020-11-06 22:16:38,318 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:16:38,326 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 64 [2020-11-06 22:16:38,331 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:16:38,350 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-11-06 22:16:38,353 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:16:38,374 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-11-06 22:16:38,376 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:16:38,395 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2020-11-06 22:16:38,397 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:16:38,399 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 23 [2020-11-06 22:16:38,401 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:16:38,450 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-11-06 22:16:38,452 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:16:38,454 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2020-11-06 22:16:38,455 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:16:38,496 INFO L134 CoverageAnalysis]: Checked inductivity of 352 backedges. 104 proven. 101 refuted. 0 times theorem prover too weak. 147 trivial. 0 not checked. [2020-11-06 22:16:38,497 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1368810084] [2020-11-06 22:16:38,497 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1139661501] [2020-11-06 22:16:38,497 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-11-06 22:16:38,562 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2020-11-06 22:16:38,563 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-11-06 22:16:38,564 INFO L263 TraceCheckSpWp]: Trace formula consists of 203 conjuncts, 10 conjunts are in the unsatisfiable core [2020-11-06 22:16:38,568 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-06 22:16:38,718 INFO L134 CoverageAnalysis]: Checked inductivity of 352 backedges. 141 proven. 21 refuted. 0 times theorem prover too weak. 190 trivial. 0 not checked. [2020-11-06 22:16:38,719 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-11-06 22:16:38,719 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 11] total 21 [2020-11-06 22:16:38,720 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [499713802] [2020-11-06 22:16:38,720 INFO L461 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-11-06 22:16:38,721 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-11-06 22:16:38,721 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-11-06 22:16:38,721 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=52, Invalid=368, Unknown=0, NotChecked=0, Total=420 [2020-11-06 22:16:38,721 INFO L87 Difference]: Start difference. First operand 122 states and 160 transitions. Second operand 21 states. [2020-11-06 22:16:41,252 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-06 22:16:41,253 INFO L93 Difference]: Finished difference Result 254 states and 375 transitions. [2020-11-06 22:16:41,258 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2020-11-06 22:16:41,258 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 124 [2020-11-06 22:16:41,259 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-06 22:16:41,261 INFO L225 Difference]: With dead ends: 254 [2020-11-06 22:16:41,261 INFO L226 Difference]: Without dead ends: 146 [2020-11-06 22:16:41,263 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 203 GetRequests, 156 SyntacticMatches, 0 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 477 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=367, Invalid=1985, Unknown=0, NotChecked=0, Total=2352 [2020-11-06 22:16:41,264 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 146 states. [2020-11-06 22:16:41,276 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 146 to 126. [2020-11-06 22:16:41,276 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 126 states. [2020-11-06 22:16:41,277 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 126 states to 126 states and 162 transitions. [2020-11-06 22:16:41,278 INFO L78 Accepts]: Start accepts. Automaton has 126 states and 162 transitions. Word has length 124 [2020-11-06 22:16:41,278 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-06 22:16:41,278 INFO L481 AbstractCegarLoop]: Abstraction has 126 states and 162 transitions. [2020-11-06 22:16:41,278 INFO L482 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-11-06 22:16:41,279 INFO L276 IsEmpty]: Start isEmpty. Operand 126 states and 162 transitions. [2020-11-06 22:16:41,280 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 112 [2020-11-06 22:16:41,280 INFO L414 BasicCegarLoop]: Found error trace [2020-11-06 22:16:41,280 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 7, 7, 6, 6, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-06 22:16:41,493 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,11 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-11-06 22:16:41,495 INFO L429 AbstractCegarLoop]: === Iteration 13 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-06 22:16:41,495 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-06 22:16:41,496 INFO L82 PathProgramCache]: Analyzing trace with hash 2083902716, now seen corresponding path program 4 times [2020-11-06 22:16:41,496 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-06 22:16:41,496 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1779728701] [2020-11-06 22:16:41,496 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-06 22:16:41,513 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-11-06 22:16:41,514 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-11-06 22:16:41,531 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-11-06 22:16:41,531 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-11-06 22:16:41,577 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2020-11-06 22:16:41,577 INFO L523 BasicCegarLoop]: Counterexample might be feasible [2020-11-06 22:16:41,578 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2020-11-06 22:16:41,675 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 06.11 10:16:41 BoogieIcfgContainer [2020-11-06 22:16:41,676 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-11-06 22:16:41,681 INFO L168 Benchmark]: Toolchain (without parser) took 26435.82 ms. Allocated memory was 162.5 MB in the beginning and 418.4 MB in the end (delta: 255.9 MB). Free memory was 138.5 MB in the beginning and 162.7 MB in the end (delta: -24.3 MB). Peak memory consumption was 232.4 MB. Max. memory is 8.0 GB. [2020-11-06 22:16:41,681 INFO L168 Benchmark]: CDTParser took 0.18 ms. Allocated memory is still 162.5 MB. Free memory is still 137.0 MB. There was no memory consumed. Max. memory is 8.0 GB. [2020-11-06 22:16:41,687 INFO L168 Benchmark]: CACSL2BoogieTranslator took 267.01 ms. Allocated memory is still 162.5 MB. Free memory was 137.7 MB in the beginning and 128.5 MB in the end (delta: 9.2 MB). Peak memory consumption was 9.4 MB. Max. memory is 8.0 GB. [2020-11-06 22:16:41,688 INFO L168 Benchmark]: Boogie Preprocessor took 39.56 ms. Allocated memory is still 162.5 MB. Free memory was 128.4 MB in the beginning and 127.1 MB in the end (delta: 1.3 MB). Peak memory consumption was 1.0 MB. Max. memory is 8.0 GB. [2020-11-06 22:16:41,689 INFO L168 Benchmark]: RCFGBuilder took 562.75 ms. Allocated memory is still 162.5 MB. Free memory was 127.1 MB in the beginning and 112.4 MB in the end (delta: 14.7 MB). Peak memory consumption was 14.7 MB. Max. memory is 8.0 GB. [2020-11-06 22:16:41,692 INFO L168 Benchmark]: TraceAbstraction took 25550.50 ms. Allocated memory was 162.5 MB in the beginning and 418.4 MB in the end (delta: 255.9 MB). Free memory was 112.0 MB in the beginning and 162.7 MB in the end (delta: -50.8 MB). Peak memory consumption was 206.1 MB. Max. memory is 8.0 GB. [2020-11-06 22:16:41,699 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.18 ms. Allocated memory is still 162.5 MB. Free memory is still 137.0 MB. There was no memory consumed. Max. memory is 8.0 GB. * CACSL2BoogieTranslator took 267.01 ms. Allocated memory is still 162.5 MB. Free memory was 137.7 MB in the beginning and 128.5 MB in the end (delta: 9.2 MB). Peak memory consumption was 9.4 MB. Max. memory is 8.0 GB. * Boogie Preprocessor took 39.56 ms. Allocated memory is still 162.5 MB. Free memory was 128.4 MB in the beginning and 127.1 MB in the end (delta: 1.3 MB). Peak memory consumption was 1.0 MB. Max. memory is 8.0 GB. * RCFGBuilder took 562.75 ms. Allocated memory is still 162.5 MB. Free memory was 127.1 MB in the beginning and 112.4 MB in the end (delta: 14.7 MB). Peak memory consumption was 14.7 MB. Max. memory is 8.0 GB. * TraceAbstraction took 25550.50 ms. Allocated memory was 162.5 MB in the beginning and 418.4 MB in the end (delta: 255.9 MB). Free memory was 112.0 MB in the beginning and 162.7 MB in the end (delta: -50.8 MB). Peak memory consumption was 206.1 MB. Max. memory is 8.0 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 4]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_error() is reachable We found a FailurePath: [L38] int x = 5; VAL [x=5] [L39] CALL, EXPR fibo1(x) VAL [\old(n)=5] [L10] COND FALSE !(n < 1) VAL [\old(n)=5, n=5] [L12] COND FALSE !(n == 1) VAL [\old(n)=5, n=5] [L15] CALL, EXPR fibo2(n-1) VAL [\old(n)=4] [L20] COND FALSE !(n < 1) VAL [\old(n)=4, n=4] [L22] COND FALSE !(n == 1) VAL [\old(n)=4, n=4] [L25] CALL, EXPR fibo1(n-1) VAL [\old(n)=3] [L10] COND FALSE !(n < 1) VAL [\old(n)=3, n=3] [L12] COND FALSE !(n == 1) VAL [\old(n)=3, n=3] [L15] CALL, EXPR fibo2(n-1) VAL [\old(n)=2] [L20] COND FALSE !(n < 1) VAL [\old(n)=2, n=2] [L22] COND FALSE !(n == 1) VAL [\old(n)=2, n=2] [L25] CALL, EXPR fibo1(n-1) VAL [\old(n)=1] [L10] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L12] COND TRUE n == 1 [L13] return 1; VAL [\old(n)=1, \result=1, n=1] [L25] RET, EXPR fibo1(n-1) VAL [\old(n)=2, fibo1(n-1)=1, n=2] [L25] CALL, EXPR fibo1(n-2) VAL [\old(n)=0] [L10] COND TRUE n < 1 [L11] return 0; VAL [\old(n)=0, \result=0, n=0] [L25] RET, EXPR fibo1(n-2) VAL [\old(n)=2, fibo1(n-1)=1, fibo1(n-2)=0, n=2] [L25] return fibo1(n-1) + fibo1(n-2); [L15] RET, EXPR fibo2(n-1) VAL [\old(n)=3, fibo2(n-1)=1, n=3] [L15] CALL, EXPR fibo2(n-2) VAL [\old(n)=1] [L20] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L22] COND TRUE n == 1 [L23] return 1; VAL [\old(n)=1, \result=1, n=1] [L15] RET, EXPR fibo2(n-2) VAL [\old(n)=3, fibo2(n-1)=1, fibo2(n-2)=1, n=3] [L15] return fibo2(n-1) + fibo2(n-2); [L25] RET, EXPR fibo1(n-1) VAL [\old(n)=4, fibo1(n-1)=2, n=4] [L25] CALL, EXPR fibo1(n-2) VAL [\old(n)=2] [L10] COND FALSE !(n < 1) VAL [\old(n)=2, n=2] [L12] COND FALSE !(n == 1) VAL [\old(n)=2, n=2] [L15] CALL, EXPR fibo2(n-1) VAL [\old(n)=1] [L20] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L22] COND TRUE n == 1 [L23] return 1; VAL [\old(n)=1, \result=1, n=1] [L15] RET, EXPR fibo2(n-1) VAL [\old(n)=2, fibo2(n-1)=1, n=2] [L15] CALL, EXPR fibo2(n-2) VAL [\old(n)=0] [L20] COND TRUE n < 1 [L21] return 0; VAL [\old(n)=0, \result=0, n=0] [L15] RET, EXPR fibo2(n-2) VAL [\old(n)=2, fibo2(n-1)=1, fibo2(n-2)=0, n=2] [L15] return fibo2(n-1) + fibo2(n-2); [L25] RET, EXPR fibo1(n-2) VAL [\old(n)=4, fibo1(n-1)=2, fibo1(n-2)=1, n=4] [L25] return fibo1(n-1) + fibo1(n-2); [L15] RET, EXPR fibo2(n-1) VAL [\old(n)=5, fibo2(n-1)=3, n=5] [L15] CALL, EXPR fibo2(n-2) VAL [\old(n)=3] [L20] COND FALSE !(n < 1) VAL [\old(n)=3, n=3] [L22] COND FALSE !(n == 1) VAL [\old(n)=3, n=3] [L25] CALL, EXPR fibo1(n-1) VAL [\old(n)=2] [L10] COND FALSE !(n < 1) VAL [\old(n)=2, n=2] [L12] COND FALSE !(n == 1) VAL [\old(n)=2, n=2] [L15] CALL, EXPR fibo2(n-1) VAL [\old(n)=1] [L20] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L22] COND TRUE n == 1 [L23] return 1; VAL [\old(n)=1, \result=1, n=1] [L15] RET, EXPR fibo2(n-1) VAL [\old(n)=2, fibo2(n-1)=1, n=2] [L15] CALL, EXPR fibo2(n-2) VAL [\old(n)=0] [L20] COND TRUE n < 1 [L21] return 0; VAL [\old(n)=0, \result=0, n=0] [L15] RET, EXPR fibo2(n-2) VAL [\old(n)=2, fibo2(n-1)=1, fibo2(n-2)=0, n=2] [L15] return fibo2(n-1) + fibo2(n-2); [L25] RET, EXPR fibo1(n-1) VAL [\old(n)=3, fibo1(n-1)=1, n=3] [L25] CALL, EXPR fibo1(n-2) VAL [\old(n)=1] [L10] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L12] COND TRUE n == 1 [L13] return 1; VAL [\old(n)=1, \result=1, n=1] [L25] RET, EXPR fibo1(n-2) VAL [\old(n)=3, fibo1(n-1)=1, fibo1(n-2)=1, n=3] [L25] return fibo1(n-1) + fibo1(n-2); [L15] RET, EXPR fibo2(n-2) VAL [\old(n)=5, fibo2(n-1)=3, fibo2(n-2)=2, n=5] [L15] return fibo2(n-1) + fibo2(n-2); [L39] RET, EXPR fibo1(x) VAL [fibo1(x)=5, x=5] [L39] int result = fibo1(x); [L40] COND TRUE result == 5 VAL [result=5, x=5] [L41] CALL reach_error() [L4] __assert_fail("0", "fibo_2calls_5-2.c", 4, "reach_error") - StatisticsResult: Ultimate Automizer benchmark data CFG has 6 procedures, 38 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 25.3s, OverallIterations: 13, TraceHistogramMax: 10, AutomataDifference: 16.6s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 375 SDtfs, 905 SDslu, 1047 SDs, 0 SdLazy, 4940 SolverSat, 931 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 5.6s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 1312 GetRequests, 995 SyntacticMatches, 2 SemanticMatches, 315 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1953 ImplicationChecksByTransitivity, 11.0s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=126occurred in iteration=12, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.3s AutomataMinimizationTime, 12 MinimizatonAttempts, 149 StatesRemovedByMinimization, 10 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.1s SsaConstructionTime, 0.6s SatisfiabilityAnalysisTime, 4.4s InterpolantComputationTime, 1698 NumberOfCodeBlocks, 1637 NumberOfCodeBlocksAsserted, 27 NumberOfCheckSat, 1565 ConstructedInterpolants, 0 QuantifiedInterpolants, 271201 SizeOfPredicates, 44 NumberOfNonLiveVariables, 2228 ConjunctsInSsa, 88 ConjunctsInUnsatCore, 22 InterpolantComputations, 2 PerfectInterpolantSequences, 2500/3216 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be incorrect! Received shutdown request...