/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/Fibonacci04.c -------------------------------------------------------------------------------- This is Ultimate 0.2.0-b8ad66e [2020-10-23 17:58:48,080 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-10-23 17:58:48,083 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-10-23 17:58:48,121 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-10-23 17:58:48,121 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-10-23 17:58:48,123 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-10-23 17:58:48,124 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-10-23 17:58:48,127 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-10-23 17:58:48,129 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-10-23 17:58:48,130 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-10-23 17:58:48,131 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-10-23 17:58:48,133 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-10-23 17:58:48,134 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-10-23 17:58:48,135 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-10-23 17:58:48,136 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-10-23 17:58:48,138 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-10-23 17:58:48,139 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-10-23 17:58:48,140 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-10-23 17:58:48,142 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-10-23 17:58:48,144 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-10-23 17:58:48,146 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-10-23 17:58:48,148 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-10-23 17:58:48,150 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-10-23 17:58:48,150 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-10-23 17:58:48,157 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-10-23 17:58:48,173 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-10-23 17:58:48,174 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-10-23 17:58:48,174 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-10-23 17:58:48,175 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 [2020-10-23 17:58:48,216 INFO L113 SettingsManager]: Loading preferences was successful [2020-10-23 17:58:48,217 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-10-23 17:58:48,219 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-10-23 17:58:48,219 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-10-23 17:58:48,219 INFO L138 SettingsManager]: * Use SBE=true [2020-10-23 17:58:48,220 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-10-23 17:58:48,220 INFO L138 SettingsManager]: * sizeof long=4 [2020-10-23 17:58:48,220 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-10-23 17:58:48,220 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-10-23 17:58:48,221 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-10-23 17:58:48,221 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-10-23 17:58:48,223 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-10-23 17:58:48,223 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-10-23 17:58:48,223 INFO L138 SettingsManager]: * sizeof long double=12 [2020-10-23 17:58:48,224 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-10-23 17:58:48,224 INFO L138 SettingsManager]: * Use constant arrays=true [2020-10-23 17:58:48,224 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-10-23 17:58:48,224 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-10-23 17:58:48,225 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-10-23 17:58:48,225 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-10-23 17:58:48,225 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-10-23 17:58:48,225 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-10-23 17:58:48,226 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-10-23 17:58:48,226 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-10-23 17:58:48,226 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-10-23 17:58:48,226 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-10-23 17:58:48,227 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-10-23 17:58:48,227 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-10-23 17:58:48,228 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-10-23 17:58:48,228 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release [2020-10-23 17:58:48,630 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-10-23 17:58:48,681 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-10-23 17:58:48,685 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-10-23 17:58:48,688 INFO L271 PluginConnector]: Initializing CDTParser... [2020-10-23 17:58:48,689 INFO L275 PluginConnector]: CDTParser initialized [2020-10-23 17:58:48,690 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive/Fibonacci04.c [2020-10-23 17:58:48,786 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/15ac11754/a56d5fab74f843cc8bfcc3181599fd94/FLAGf386e79b8 [2020-10-23 17:58:49,529 INFO L306 CDTParser]: Found 1 translation units. [2020-10-23 17:58:49,530 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/recursive/Fibonacci04.c [2020-10-23 17:58:49,539 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/15ac11754/a56d5fab74f843cc8bfcc3181599fd94/FLAGf386e79b8 [2020-10-23 17:58:49,878 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/15ac11754/a56d5fab74f843cc8bfcc3181599fd94 [2020-10-23 17:58:49,881 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-10-23 17:58:49,888 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-10-23 17:58:49,890 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-10-23 17:58:49,890 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-10-23 17:58:49,895 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-10-23 17:58:49,896 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.10 05:58:49" (1/1) ... [2020-10-23 17:58:49,899 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@175e152f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 05:58:49, skipping insertion in model container [2020-10-23 17:58:49,899 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.10 05:58:49" (1/1) ... [2020-10-23 17:58:49,908 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-10-23 17:58:49,923 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-10-23 17:58:50,096 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-10-23 17:58:50,108 INFO L203 MainTranslator]: Completed pre-run [2020-10-23 17:58:50,125 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-10-23 17:58:50,143 INFO L208 MainTranslator]: Completed translation [2020-10-23 17:58:50,143 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 05:58:50 WrapperNode [2020-10-23 17:58:50,144 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-10-23 17:58:50,145 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-10-23 17:58:50,145 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-10-23 17:58:50,145 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-10-23 17:58:50,159 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 05:58:50" (1/1) ... [2020-10-23 17:58:50,160 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 05:58:50" (1/1) ... [2020-10-23 17:58:50,167 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 05:58:50" (1/1) ... [2020-10-23 17:58:50,168 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 05:58:50" (1/1) ... [2020-10-23 17:58:50,174 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 05:58:50" (1/1) ... [2020-10-23 17:58:50,176 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 05:58:50" (1/1) ... [2020-10-23 17:58:50,177 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 05:58:50" (1/1) ... [2020-10-23 17:58:50,179 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-10-23 17:58:50,181 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-10-23 17:58:50,181 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-10-23 17:58:50,181 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-10-23 17:58:50,182 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 05:58:50" (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 [2020-10-23 17:58:50,265 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-10-23 17:58:50,266 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-10-23 17:58:50,266 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2020-10-23 17:58:50,266 INFO L138 BoogieDeclarations]: Found implementation of procedure fibonacci [2020-10-23 17:58:50,266 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-10-23 17:58:50,266 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-10-23 17:58:50,267 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2020-10-23 17:58:50,267 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2020-10-23 17:58:50,267 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-10-23 17:58:50,267 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-10-23 17:58:50,267 INFO L130 BoogieDeclarations]: Found specification of procedure fibonacci [2020-10-23 17:58:50,268 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-10-23 17:58:50,268 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-10-23 17:58:50,268 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2020-10-23 17:58:50,268 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-10-23 17:58:50,268 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-10-23 17:58:50,269 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-10-23 17:58:50,269 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-10-23 17:58:50,624 INFO L293 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-10-23 17:58:50,625 INFO L298 CfgBuilder]: Removed 0 assume(true) statements. [2020-10-23 17:58:50,630 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.10 05:58:50 BoogieIcfgContainer [2020-10-23 17:58:50,631 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-10-23 17:58:50,636 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-10-23 17:58:50,636 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-10-23 17:58:50,647 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-10-23 17:58:50,647 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.10 05:58:49" (1/3) ... [2020-10-23 17:58:50,648 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@37d83e44 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.10 05:58:50, skipping insertion in model container [2020-10-23 17:58:50,649 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 05:58:50" (2/3) ... [2020-10-23 17:58:50,649 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@37d83e44 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.10 05:58:50, skipping insertion in model container [2020-10-23 17:58:50,649 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.10 05:58:50" (3/3) ... [2020-10-23 17:58:50,655 INFO L111 eAbstractionObserver]: Analyzing ICFG Fibonacci04.c [2020-10-23 17:58:50,703 INFO L164 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2020-10-23 17:58:50,712 INFO L176 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-10-23 17:58:50,744 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-10-23 17:58:50,775 INFO L377 AbstractCegarLoop]: Interprodecural is true [2020-10-23 17:58:50,775 INFO L378 AbstractCegarLoop]: Hoare is true [2020-10-23 17:58:50,776 INFO L379 AbstractCegarLoop]: Compute interpolants for FPandBP [2020-10-23 17:58:50,776 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-10-23 17:58:50,776 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-10-23 17:58:50,776 INFO L382 AbstractCegarLoop]: Difference is false [2020-10-23 17:58:50,776 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-10-23 17:58:50,776 INFO L387 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-10-23 17:58:50,795 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states. [2020-10-23 17:58:50,802 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2020-10-23 17:58:50,802 INFO L414 BasicCegarLoop]: Found error trace [2020-10-23 17:58:50,803 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-23 17:58:50,804 INFO L429 AbstractCegarLoop]: === Iteration 1 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-23 17:58:50,816 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-23 17:58:50,817 INFO L82 PathProgramCache]: Analyzing trace with hash 2107265492, now seen corresponding path program 1 times [2020-10-23 17:58:50,839 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-10-23 17:58:50,840 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [417145838] [2020-10-23 17:58:50,840 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-23 17:58:51,033 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 17:58:51,145 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-23 17:58:51,150 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 17:58:51,163 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-10-23 17:58:51,168 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 17:58:51,205 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-23 17:58:51,206 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [417145838] [2020-10-23 17:58:51,207 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-10-23 17:58:51,207 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2020-10-23 17:58:51,208 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [550396066] [2020-10-23 17:58:51,213 INFO L461 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-10-23 17:58:51,214 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-10-23 17:58:51,230 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-10-23 17:58:51,231 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2020-10-23 17:58:51,233 INFO L87 Difference]: Start difference. First operand 28 states. Second operand 6 states. [2020-10-23 17:58:51,563 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-23 17:58:51,563 INFO L93 Difference]: Finished difference Result 41 states and 48 transitions. [2020-10-23 17:58:51,564 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-10-23 17:58:51,565 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 15 [2020-10-23 17:58:51,566 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-23 17:58:51,590 INFO L225 Difference]: With dead ends: 41 [2020-10-23 17:58:51,590 INFO L226 Difference]: Without dead ends: 23 [2020-10-23 17:58:51,597 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=23, Invalid=49, Unknown=0, NotChecked=0, Total=72 [2020-10-23 17:58:51,618 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2020-10-23 17:58:51,664 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2020-10-23 17:58:51,666 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2020-10-23 17:58:51,669 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 27 transitions. [2020-10-23 17:58:51,672 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 27 transitions. Word has length 15 [2020-10-23 17:58:51,672 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-23 17:58:51,673 INFO L481 AbstractCegarLoop]: Abstraction has 23 states and 27 transitions. [2020-10-23 17:58:51,673 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-10-23 17:58:51,673 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 27 transitions. [2020-10-23 17:58:51,675 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-10-23 17:58:51,675 INFO L414 BasicCegarLoop]: Found error trace [2020-10-23 17:58:51,676 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-23 17:58:51,676 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-10-23 17:58:51,676 INFO L429 AbstractCegarLoop]: === Iteration 2 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-23 17:58:51,677 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-23 17:58:51,678 INFO L82 PathProgramCache]: Analyzing trace with hash 1001048603, now seen corresponding path program 1 times [2020-10-23 17:58:51,678 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-10-23 17:58:51,678 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1324383565] [2020-10-23 17:58:51,679 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-23 17:58:51,730 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 17:58:51,787 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-23 17:58:51,790 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 17:58:51,799 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-10-23 17:58:51,802 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 17:58:51,826 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-23 17:58:51,827 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1324383565] [2020-10-23 17:58:51,827 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-10-23 17:58:51,828 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2020-10-23 17:58:51,828 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1013997875] [2020-10-23 17:58:51,829 INFO L461 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-10-23 17:58:51,830 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-10-23 17:58:51,831 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-10-23 17:58:51,831 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2020-10-23 17:58:51,831 INFO L87 Difference]: Start difference. First operand 23 states and 27 transitions. Second operand 6 states. [2020-10-23 17:58:52,035 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-23 17:58:52,036 INFO L93 Difference]: Finished difference Result 30 states and 35 transitions. [2020-10-23 17:58:52,036 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-10-23 17:58:52,037 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 16 [2020-10-23 17:58:52,037 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-23 17:58:52,038 INFO L225 Difference]: With dead ends: 30 [2020-10-23 17:58:52,038 INFO L226 Difference]: Without dead ends: 25 [2020-10-23 17:58:52,040 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=23, Invalid=49, Unknown=0, NotChecked=0, Total=72 [2020-10-23 17:58:52,040 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2020-10-23 17:58:52,047 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 23. [2020-10-23 17:58:52,048 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2020-10-23 17:58:52,049 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 27 transitions. [2020-10-23 17:58:52,049 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 27 transitions. Word has length 16 [2020-10-23 17:58:52,050 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-23 17:58:52,050 INFO L481 AbstractCegarLoop]: Abstraction has 23 states and 27 transitions. [2020-10-23 17:58:52,050 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-10-23 17:58:52,050 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 27 transitions. [2020-10-23 17:58:52,051 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-10-23 17:58:52,051 INFO L414 BasicCegarLoop]: Found error trace [2020-10-23 17:58:52,052 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-23 17:58:52,052 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-10-23 17:58:52,052 INFO L429 AbstractCegarLoop]: === Iteration 3 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-23 17:58:52,053 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-23 17:58:52,053 INFO L82 PathProgramCache]: Analyzing trace with hash -768223736, now seen corresponding path program 1 times [2020-10-23 17:58:52,053 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-10-23 17:58:52,054 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1290137377] [2020-10-23 17:58:52,054 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-23 17:58:52,074 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 17:58:52,116 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-23 17:58:52,119 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 17:58:52,127 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-10-23 17:58:52,134 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 17:58:52,179 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-10-23 17:58:52,182 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 17:58:52,202 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 9 [2020-10-23 17:58:52,204 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 17:58:52,210 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 5 proven. 3 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-10-23 17:58:52,211 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1290137377] [2020-10-23 17:58:52,211 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1018632582] [2020-10-23 17:58:52,212 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 [2020-10-23 17:58:52,277 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 17:58:52,279 INFO L263 TraceCheckSpWp]: Trace formula consists of 129 conjuncts, 6 conjunts are in the unsatisfiable core [2020-10-23 17:58:52,289 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-10-23 17:58:52,456 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-10-23 17:58:52,456 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-10-23 17:58:52,457 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6] total 10 [2020-10-23 17:58:52,457 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [394296450] [2020-10-23 17:58:52,458 INFO L461 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-10-23 17:58:52,458 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-10-23 17:58:52,459 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-10-23 17:58:52,459 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=70, Unknown=0, NotChecked=0, Total=90 [2020-10-23 17:58:52,459 INFO L87 Difference]: Start difference. First operand 23 states and 27 transitions. Second operand 10 states. [2020-10-23 17:58:52,768 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-23 17:58:52,769 INFO L93 Difference]: Finished difference Result 41 states and 52 transitions. [2020-10-23 17:58:52,769 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-10-23 17:58:52,769 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 28 [2020-10-23 17:58:52,770 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-23 17:58:52,771 INFO L225 Difference]: With dead ends: 41 [2020-10-23 17:58:52,771 INFO L226 Difference]: Without dead ends: 25 [2020-10-23 17:58:52,772 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 34 SyntacticMatches, 1 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=58, Invalid=152, Unknown=0, NotChecked=0, Total=210 [2020-10-23 17:58:52,773 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2020-10-23 17:58:52,780 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2020-10-23 17:58:52,780 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2020-10-23 17:58:52,781 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 29 transitions. [2020-10-23 17:58:52,781 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 29 transitions. Word has length 28 [2020-10-23 17:58:52,782 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-23 17:58:52,782 INFO L481 AbstractCegarLoop]: Abstraction has 25 states and 29 transitions. [2020-10-23 17:58:52,782 INFO L482 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-10-23 17:58:52,782 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 29 transitions. [2020-10-23 17:58:52,783 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2020-10-23 17:58:52,784 INFO L414 BasicCegarLoop]: Found error trace [2020-10-23 17:58:52,784 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-23 17:58:53,000 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2 [2020-10-23 17:58:53,001 INFO L429 AbstractCegarLoop]: === Iteration 4 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-23 17:58:53,002 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-23 17:58:53,003 INFO L82 PathProgramCache]: Analyzing trace with hash 1973821333, now seen corresponding path program 1 times [2020-10-23 17:58:53,003 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-10-23 17:58:53,004 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [896458335] [2020-10-23 17:58:53,004 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-23 17:58:53,036 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 17:58:53,088 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-23 17:58:53,091 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 17:58:53,098 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-10-23 17:58:53,104 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 17:58:53,130 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-10-23 17:58:53,133 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 17:58:53,149 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2020-10-23 17:58:53,151 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 17:58:53,157 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-10-23 17:58:53,157 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [896458335] [2020-10-23 17:58:53,158 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [940640388] [2020-10-23 17:58:53,158 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2020-10-23 17:58:53,223 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 17:58:53,224 INFO L263 TraceCheckSpWp]: Trace formula consists of 131 conjuncts, 6 conjunts are in the unsatisfiable core [2020-10-23 17:58:53,227 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-10-23 17:58:53,274 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-10-23 17:58:53,274 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-10-23 17:58:53,274 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6] total 8 [2020-10-23 17:58:53,275 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1217770037] [2020-10-23 17:58:53,275 INFO L461 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-10-23 17:58:53,276 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-10-23 17:58:53,276 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-10-23 17:58:53,277 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=41, Unknown=0, NotChecked=0, Total=56 [2020-10-23 17:58:53,277 INFO L87 Difference]: Start difference. First operand 25 states and 29 transitions. Second operand 8 states. [2020-10-23 17:58:53,660 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-23 17:58:53,660 INFO L93 Difference]: Finished difference Result 44 states and 58 transitions. [2020-10-23 17:58:53,661 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-10-23 17:58:53,661 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 29 [2020-10-23 17:58:53,661 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-23 17:58:53,663 INFO L225 Difference]: With dead ends: 44 [2020-10-23 17:58:53,663 INFO L226 Difference]: Without dead ends: 39 [2020-10-23 17:58:53,664 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 38 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=46, Invalid=110, Unknown=0, NotChecked=0, Total=156 [2020-10-23 17:58:53,664 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2020-10-23 17:58:53,674 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2020-10-23 17:58:53,674 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2020-10-23 17:58:53,676 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 53 transitions. [2020-10-23 17:58:53,676 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 53 transitions. Word has length 29 [2020-10-23 17:58:53,677 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-23 17:58:53,677 INFO L481 AbstractCegarLoop]: Abstraction has 39 states and 53 transitions. [2020-10-23 17:58:53,677 INFO L482 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-10-23 17:58:53,677 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 53 transitions. [2020-10-23 17:58:53,679 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2020-10-23 17:58:53,679 INFO L414 BasicCegarLoop]: Found error trace [2020-10-23 17:58:53,680 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-23 17:58:53,893 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-10-23 17:58:53,894 INFO L429 AbstractCegarLoop]: === Iteration 5 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-23 17:58:53,895 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-23 17:58:53,895 INFO L82 PathProgramCache]: Analyzing trace with hash 1902544615, now seen corresponding path program 2 times [2020-10-23 17:58:53,896 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-10-23 17:58:53,896 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [278325719] [2020-10-23 17:58:53,897 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-23 17:58:53,925 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 17:58:53,986 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-23 17:58:53,988 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 17:58:53,993 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-10-23 17:58:54,000 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 17:58:54,014 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-10-23 17:58:54,019 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 17:58:54,072 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-10-23 17:58:54,074 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 17:58:54,077 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2020-10-23 17:58:54,079 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 17:58:54,083 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 23 [2020-10-23 17:58:54,085 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 17:58:54,102 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 23 proven. 7 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2020-10-23 17:58:54,103 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [278325719] [2020-10-23 17:58:54,103 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1897565027] [2020-10-23 17:58:54,103 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 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 [2020-10-23 17:58:54,169 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2020-10-23 17:58:54,169 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-10-23 17:58:54,170 INFO L263 TraceCheckSpWp]: Trace formula consists of 160 conjuncts, 8 conjunts are in the unsatisfiable core [2020-10-23 17:58:54,173 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-10-23 17:58:54,305 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 6 proven. 21 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2020-10-23 17:58:54,306 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-10-23 17:58:54,315 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7] total 13 [2020-10-23 17:58:54,316 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2104735345] [2020-10-23 17:58:54,317 INFO L461 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-10-23 17:58:54,318 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-10-23 17:58:54,318 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-10-23 17:58:54,319 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=124, Unknown=0, NotChecked=0, Total=156 [2020-10-23 17:58:54,320 INFO L87 Difference]: Start difference. First operand 39 states and 53 transitions. Second operand 13 states. [2020-10-23 17:58:55,356 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-23 17:58:55,357 INFO L93 Difference]: Finished difference Result 74 states and 109 transitions. [2020-10-23 17:58:55,363 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-10-23 17:58:55,363 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 42 [2020-10-23 17:58:55,364 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-23 17:58:55,365 INFO L225 Difference]: With dead ends: 74 [2020-10-23 17:58:55,365 INFO L226 Difference]: Without dead ends: 40 [2020-10-23 17:58:55,367 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 75 GetRequests, 52 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 67 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=143, Invalid=457, Unknown=0, NotChecked=0, Total=600 [2020-10-23 17:58:55,367 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2020-10-23 17:58:55,375 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 40. [2020-10-23 17:58:55,375 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2020-10-23 17:58:55,381 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 48 transitions. [2020-10-23 17:58:55,381 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 48 transitions. Word has length 42 [2020-10-23 17:58:55,382 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-23 17:58:55,382 INFO L481 AbstractCegarLoop]: Abstraction has 40 states and 48 transitions. [2020-10-23 17:58:55,382 INFO L482 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-10-23 17:58:55,382 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 48 transitions. [2020-10-23 17:58:55,385 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 85 [2020-10-23 17:58:55,385 INFO L414 BasicCegarLoop]: Found error trace [2020-10-23 17:58:55,390 INFO L422 BasicCegarLoop]: trace histogram [11, 11, 9, 5, 5, 5, 5, 5, 5, 5, 4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-23 17:58:55,591 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-10-23 17:58:55,592 INFO L429 AbstractCegarLoop]: === Iteration 6 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-23 17:58:55,592 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-23 17:58:55,593 INFO L82 PathProgramCache]: Analyzing trace with hash -234474472, now seen corresponding path program 3 times [2020-10-23 17:58:55,593 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-10-23 17:58:55,594 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1537227787] [2020-10-23 17:58:55,594 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-23 17:58:55,624 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 17:58:55,680 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-23 17:58:55,682 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 17:58:55,688 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-10-23 17:58:55,701 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 17:58:55,777 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-10-23 17:58:55,790 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 17:58:55,833 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-10-23 17:58:55,836 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 17:58:55,874 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-10-23 17:58:55,876 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 17:58:55,903 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2020-10-23 17:58:55,905 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 17:58:55,907 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 23 [2020-10-23 17:58:55,913 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 17:58:55,918 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 37 [2020-10-23 17:58:55,930 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 17:58:55,942 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-10-23 17:58:55,944 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 17:58:55,951 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-10-23 17:58:55,954 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 17:58:55,959 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2020-10-23 17:58:55,960 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 17:58:55,963 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 23 [2020-10-23 17:58:55,964 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 17:58:55,983 INFO L134 CoverageAnalysis]: Checked inductivity of 296 backedges. 22 proven. 127 refuted. 0 times theorem prover too weak. 147 trivial. 0 not checked. [2020-10-23 17:58:55,984 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1537227787] [2020-10-23 17:58:55,984 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1395166889] [2020-10-23 17:58:55,984 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 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 [2020-10-23 17:58:56,069 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2020-10-23 17:58:56,070 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-10-23 17:58:56,071 INFO L263 TraceCheckSpWp]: Trace formula consists of 230 conjuncts, 8 conjunts are in the unsatisfiable core [2020-10-23 17:58:56,088 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-10-23 17:58:56,173 INFO L134 CoverageAnalysis]: Checked inductivity of 296 backedges. 41 proven. 82 refuted. 0 times theorem prover too weak. 173 trivial. 0 not checked. [2020-10-23 17:58:56,174 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-10-23 17:58:56,174 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 7] total 10 [2020-10-23 17:58:56,174 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1611478069] [2020-10-23 17:58:56,177 INFO L461 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-10-23 17:58:56,179 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-10-23 17:58:56,180 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-10-23 17:58:56,181 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=66, Unknown=0, NotChecked=0, Total=90 [2020-10-23 17:58:56,181 INFO L87 Difference]: Start difference. First operand 40 states and 48 transitions. Second operand 10 states. [2020-10-23 17:58:56,834 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-23 17:58:56,834 INFO L93 Difference]: Finished difference Result 83 states and 114 transitions. [2020-10-23 17:58:56,835 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-10-23 17:58:56,835 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 84 [2020-10-23 17:58:56,836 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-23 17:58:56,840 INFO L225 Difference]: With dead ends: 83 [2020-10-23 17:58:56,840 INFO L226 Difference]: Without dead ends: 78 [2020-10-23 17:58:56,841 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 122 GetRequests, 106 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 36 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=90, Invalid=216, Unknown=0, NotChecked=0, Total=306 [2020-10-23 17:58:56,841 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2020-10-23 17:58:56,861 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 72. [2020-10-23 17:58:56,861 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 72 states. [2020-10-23 17:58:56,863 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 100 transitions. [2020-10-23 17:58:56,864 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 100 transitions. Word has length 84 [2020-10-23 17:58:56,864 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-23 17:58:56,864 INFO L481 AbstractCegarLoop]: Abstraction has 72 states and 100 transitions. [2020-10-23 17:58:56,865 INFO L482 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-10-23 17:58:56,865 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 100 transitions. [2020-10-23 17:58:56,871 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 153 [2020-10-23 17:58:56,872 INFO L414 BasicCegarLoop]: Found error trace [2020-10-23 17:58:56,872 INFO L422 BasicCegarLoop]: trace histogram [21, 21, 17, 10, 10, 10, 10, 10, 10, 10, 7, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-23 17:58:57,083 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-10-23 17:58:57,084 INFO L429 AbstractCegarLoop]: === Iteration 7 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-23 17:58:57,085 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-23 17:58:57,085 INFO L82 PathProgramCache]: Analyzing trace with hash 704043195, now seen corresponding path program 4 times [2020-10-23 17:58:57,085 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-10-23 17:58:57,086 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [72639020] [2020-10-23 17:58:57,086 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-23 17:58:57,111 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 17:58:57,194 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-23 17:58:57,196 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 17:58:57,204 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-10-23 17:58:57,224 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 17:58:57,265 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-10-23 17:58:57,271 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 17:58:57,280 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-10-23 17:58:57,282 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 17:58:57,287 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-10-23 17:58:57,288 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 17:58:57,291 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-10-23 17:58:57,292 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 17:58:57,294 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2020-10-23 17:58:57,295 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 17:58:57,296 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 23 [2020-10-23 17:58:57,297 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 17:58:57,300 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 37 [2020-10-23 17:58:57,301 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 17:58:57,304 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-10-23 17:58:57,305 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 17:58:57,307 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2020-10-23 17:58:57,308 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 17:58:57,312 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 64 [2020-10-23 17:58:57,321 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 17:58:57,362 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-10-23 17:58:57,371 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 17:58:57,395 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-10-23 17:58:57,400 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 17:58:57,421 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-10-23 17:58:57,424 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 17:58:57,444 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-10-23 17:58:57,446 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 17:58:57,448 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2020-10-23 17:58:57,450 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 17:58:57,452 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 23 [2020-10-23 17:58:57,456 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 17:58:57,462 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 37 [2020-10-23 17:58:57,467 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 17:58:57,471 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-10-23 17:58:57,472 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 17:58:57,475 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2020-10-23 17:58:57,476 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 17:58:57,484 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 64 [2020-10-23 17:58:57,487 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 17:58:57,554 INFO L134 CoverageAnalysis]: Checked inductivity of 1156 backedges. 363 proven. 123 refuted. 0 times theorem prover too weak. 670 trivial. 0 not checked. [2020-10-23 17:58:57,554 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [72639020] [2020-10-23 17:58:57,554 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1048779671] [2020-10-23 17:58:57,555 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST 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 [2020-10-23 17:58:57,665 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2020-10-23 17:58:57,665 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-10-23 17:58:57,669 INFO L263 TraceCheckSpWp]: Trace formula consists of 307 conjuncts, 12 conjunts are in the unsatisfiable core [2020-10-23 17:58:57,687 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-10-23 17:58:57,844 INFO L134 CoverageAnalysis]: Checked inductivity of 1156 backedges. 327 proven. 131 refuted. 0 times theorem prover too weak. 698 trivial. 0 not checked. [2020-10-23 17:58:57,845 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-10-23 17:58:57,845 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 9] total 13 [2020-10-23 17:58:57,845 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [338486630] [2020-10-23 17:58:57,846 INFO L461 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-10-23 17:58:57,846 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-10-23 17:58:57,847 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-10-23 17:58:57,847 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=122, Unknown=0, NotChecked=0, Total=156 [2020-10-23 17:58:57,847 INFO L87 Difference]: Start difference. First operand 72 states and 100 transitions. Second operand 13 states. [2020-10-23 17:58:58,846 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-23 17:58:58,847 INFO L93 Difference]: Finished difference Result 187 states and 327 transitions. [2020-10-23 17:58:58,852 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-10-23 17:58:58,852 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 152 [2020-10-23 17:58:58,853 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-23 17:58:58,855 INFO L225 Difference]: With dead ends: 187 [2020-10-23 17:58:58,855 INFO L226 Difference]: Without dead ends: 68 [2020-10-23 17:58:58,859 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 218 GetRequests, 194 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 80 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=160, Invalid=490, Unknown=0, NotChecked=0, Total=650 [2020-10-23 17:58:58,860 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2020-10-23 17:58:58,872 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 68. [2020-10-23 17:58:58,872 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 68 states. [2020-10-23 17:58:58,873 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 79 transitions. [2020-10-23 17:58:58,874 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 79 transitions. Word has length 152 [2020-10-23 17:58:58,874 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-23 17:58:58,874 INFO L481 AbstractCegarLoop]: Abstraction has 68 states and 79 transitions. [2020-10-23 17:58:58,875 INFO L482 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-10-23 17:58:58,875 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 79 transitions. [2020-10-23 17:58:58,877 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 112 [2020-10-23 17:58:58,877 INFO L414 BasicCegarLoop]: Found error trace [2020-10-23 17:58:58,877 INFO L422 BasicCegarLoop]: trace histogram [15, 15, 12, 7, 7, 7, 7, 7, 7, 7, 5, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-23 17:58:59,087 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2020-10-23 17:58:59,088 INFO L429 AbstractCegarLoop]: === Iteration 8 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-23 17:58:59,089 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-23 17:58:59,089 INFO L82 PathProgramCache]: Analyzing trace with hash -667659703, now seen corresponding path program 5 times [2020-10-23 17:58:59,089 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-10-23 17:58:59,090 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1689955800] [2020-10-23 17:58:59,090 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-23 17:58:59,117 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-10-23 17:58:59,117 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-10-23 17:58:59,155 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-10-23 17:58:59,155 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-10-23 17:58:59,212 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2020-10-23 17:58:59,212 INFO L523 BasicCegarLoop]: Counterexample might be feasible [2020-10-23 17:58:59,212 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-10-23 17:58:59,320 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 23.10 05:58:59 BoogieIcfgContainer [2020-10-23 17:58:59,320 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-10-23 17:58:59,323 INFO L168 Benchmark]: Toolchain (without parser) took 9438.22 ms. Allocated memory was 153.1 MB in the beginning and 222.3 MB in the end (delta: 69.2 MB). Free memory was 129.9 MB in the beginning and 173.6 MB in the end (delta: -43.7 MB). Peak memory consumption was 26.0 MB. Max. memory is 8.0 GB. [2020-10-23 17:58:59,325 INFO L168 Benchmark]: CDTParser took 1.52 ms. Allocated memory is still 125.8 MB. Free memory was 101.3 MB in the beginning and 101.3 MB in the end (delta: 70.3 kB). There was no memory consumed. Max. memory is 8.0 GB. [2020-10-23 17:58:59,326 INFO L168 Benchmark]: CACSL2BoogieTranslator took 254.10 ms. Allocated memory is still 153.1 MB. Free memory was 129.3 MB in the beginning and 120.0 MB in the end (delta: 9.3 MB). Peak memory consumption was 9.4 MB. Max. memory is 8.0 GB. [2020-10-23 17:58:59,327 INFO L168 Benchmark]: Boogie Preprocessor took 34.74 ms. Allocated memory is still 153.1 MB. Free memory was 120.0 MB in the beginning and 118.7 MB in the end (delta: 1.3 MB). Peak memory consumption was 2.1 MB. Max. memory is 8.0 GB. [2020-10-23 17:58:59,332 INFO L168 Benchmark]: RCFGBuilder took 450.16 ms. Allocated memory is still 153.1 MB. Free memory was 118.7 MB in the beginning and 105.4 MB in the end (delta: 13.3 MB). Peak memory consumption was 12.6 MB. Max. memory is 8.0 GB. [2020-10-23 17:58:59,333 INFO L168 Benchmark]: TraceAbstraction took 8684.46 ms. Allocated memory was 153.1 MB in the beginning and 222.3 MB in the end (delta: 69.2 MB). Free memory was 105.0 MB in the beginning and 173.6 MB in the end (delta: -68.6 MB). Peak memory consumption was 801.8 kB. Max. memory is 8.0 GB. [2020-10-23 17:58:59,341 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 1.52 ms. Allocated memory is still 125.8 MB. Free memory was 101.3 MB in the beginning and 101.3 MB in the end (delta: 70.3 kB). There was no memory consumed. Max. memory is 8.0 GB. * CACSL2BoogieTranslator took 254.10 ms. Allocated memory is still 153.1 MB. Free memory was 129.3 MB in the beginning and 120.0 MB in the end (delta: 9.3 MB). Peak memory consumption was 9.4 MB. Max. memory is 8.0 GB. * Boogie Preprocessor took 34.74 ms. Allocated memory is still 153.1 MB. Free memory was 120.0 MB in the beginning and 118.7 MB in the end (delta: 1.3 MB). Peak memory consumption was 2.1 MB. Max. memory is 8.0 GB. * RCFGBuilder took 450.16 ms. Allocated memory is still 153.1 MB. Free memory was 118.7 MB in the beginning and 105.4 MB in the end (delta: 13.3 MB). Peak memory consumption was 12.6 MB. Max. memory is 8.0 GB. * TraceAbstraction took 8684.46 ms. Allocated memory was 153.1 MB in the beginning and 222.3 MB in the end (delta: 69.2 MB). Free memory was 105.0 MB in the beginning and 173.6 MB in the end (delta: -68.6 MB). Peak memory consumption was 801.8 kB. Max. memory is 8.0 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 3]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_error() is reachable We found a FailurePath: [L30] int x = __VERIFIER_nondet_int(); [L31] CALL, EXPR fibonacci(x) VAL [\old(n)=5] [L19] COND FALSE !(n < 1) VAL [\old(n)=5, n=5] [L21] COND FALSE !(n == 1) VAL [\old(n)=5, n=5] [L24] CALL, EXPR fibonacci(n-1) VAL [\old(n)=4] [L19] COND FALSE !(n < 1) VAL [\old(n)=4, n=4] [L21] COND FALSE !(n == 1) VAL [\old(n)=4, n=4] [L24] CALL, EXPR fibonacci(n-1) VAL [\old(n)=3] [L19] COND FALSE !(n < 1) VAL [\old(n)=3, n=3] [L21] COND FALSE !(n == 1) VAL [\old(n)=3, n=3] [L24] CALL, EXPR fibonacci(n-1) VAL [\old(n)=2] [L19] COND FALSE !(n < 1) VAL [\old(n)=2, n=2] [L21] COND FALSE !(n == 1) VAL [\old(n)=2, n=2] [L24] CALL, EXPR fibonacci(n-1) VAL [\old(n)=1] [L19] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L21] COND TRUE n == 1 [L22] return 1; VAL [\old(n)=1, \result=1, n=1] [L24] RET, EXPR fibonacci(n-1) VAL [\old(n)=2, fibonacci(n-1)=1, n=2] [L24] CALL, EXPR fibonacci(n-2) VAL [\old(n)=0] [L19] COND TRUE n < 1 [L20] return 0; VAL [\old(n)=0, \result=0, n=0] [L24] RET, EXPR fibonacci(n-2) VAL [\old(n)=2, fibonacci(n-1)=1, fibonacci(n-2)=0, n=2] [L24] return fibonacci(n-1) + fibonacci(n-2); [L24] RET, EXPR fibonacci(n-1) VAL [\old(n)=3, fibonacci(n-1)=1, n=3] [L24] CALL, EXPR fibonacci(n-2) VAL [\old(n)=1] [L19] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L21] COND TRUE n == 1 [L22] return 1; VAL [\old(n)=1, \result=1, n=1] [L24] RET, EXPR fibonacci(n-2) VAL [\old(n)=3, fibonacci(n-1)=1, fibonacci(n-2)=1, n=3] [L24] return fibonacci(n-1) + fibonacci(n-2); [L24] RET, EXPR fibonacci(n-1) VAL [\old(n)=4, fibonacci(n-1)=2, n=4] [L24] CALL, EXPR fibonacci(n-2) VAL [\old(n)=2] [L19] COND FALSE !(n < 1) VAL [\old(n)=2, n=2] [L21] COND FALSE !(n == 1) VAL [\old(n)=2, n=2] [L24] CALL, EXPR fibonacci(n-1) VAL [\old(n)=1] [L19] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L21] COND TRUE n == 1 [L22] return 1; VAL [\old(n)=1, \result=1, n=1] [L24] RET, EXPR fibonacci(n-1) VAL [\old(n)=2, fibonacci(n-1)=1, n=2] [L24] CALL, EXPR fibonacci(n-2) VAL [\old(n)=0] [L19] COND TRUE n < 1 [L20] return 0; VAL [\old(n)=0, \result=0, n=0] [L24] RET, EXPR fibonacci(n-2) VAL [\old(n)=2, fibonacci(n-1)=1, fibonacci(n-2)=0, n=2] [L24] return fibonacci(n-1) + fibonacci(n-2); [L24] RET, EXPR fibonacci(n-2) VAL [\old(n)=4, fibonacci(n-1)=2, fibonacci(n-2)=1, n=4] [L24] return fibonacci(n-1) + fibonacci(n-2); [L24] RET, EXPR fibonacci(n-1) VAL [\old(n)=5, fibonacci(n-1)=3, n=5] [L24] CALL, EXPR fibonacci(n-2) VAL [\old(n)=3] [L19] COND FALSE !(n < 1) VAL [\old(n)=3, n=3] [L21] COND FALSE !(n == 1) VAL [\old(n)=3, n=3] [L24] CALL, EXPR fibonacci(n-1) VAL [\old(n)=2] [L19] COND FALSE !(n < 1) VAL [\old(n)=2, n=2] [L21] COND FALSE !(n == 1) VAL [\old(n)=2, n=2] [L24] CALL, EXPR fibonacci(n-1) VAL [\old(n)=1] [L19] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L21] COND TRUE n == 1 [L22] return 1; VAL [\old(n)=1, \result=1, n=1] [L24] RET, EXPR fibonacci(n-1) VAL [\old(n)=2, fibonacci(n-1)=1, n=2] [L24] CALL, EXPR fibonacci(n-2) VAL [\old(n)=0] [L19] COND TRUE n < 1 [L20] return 0; VAL [\old(n)=0, \result=0, n=0] [L24] RET, EXPR fibonacci(n-2) VAL [\old(n)=2, fibonacci(n-1)=1, fibonacci(n-2)=0, n=2] [L24] return fibonacci(n-1) + fibonacci(n-2); [L24] RET, EXPR fibonacci(n-1) VAL [\old(n)=3, fibonacci(n-1)=1, n=3] [L24] CALL, EXPR fibonacci(n-2) VAL [\old(n)=1] [L19] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L21] COND TRUE n == 1 [L22] return 1; VAL [\old(n)=1, \result=1, n=1] [L24] RET, EXPR fibonacci(n-2) VAL [\old(n)=3, fibonacci(n-1)=1, fibonacci(n-2)=1, n=3] [L24] return fibonacci(n-1) + fibonacci(n-2); [L24] RET, EXPR fibonacci(n-2) VAL [\old(n)=5, fibonacci(n-1)=3, fibonacci(n-2)=2, n=5] [L24] return fibonacci(n-1) + fibonacci(n-2); [L31] RET, EXPR fibonacci(x) VAL [fibonacci(x)=5, x=5] [L31] int result = fibonacci(x); [L32] COND FALSE !(x != 5 || result == 3) VAL [result=5, x=5] [L35] CALL reach_error() [L3] __assert_fail("0", "Fibonacci04.c", 3, "reach_error") - StatisticsResult: Ultimate Automizer benchmark data CFG has 5 procedures, 28 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 8.4s, OverallIterations: 8, TraceHistogramMax: 21, AutomataDifference: 4.0s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 147 SDtfs, 293 SDslu, 171 SDs, 0 SdLazy, 814 SolverSat, 253 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 1.3s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 534 GetRequests, 432 SyntacticMatches, 1 SemanticMatches, 101 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 214 ImplicationChecksByTransitivity, 2.8s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=72occurred in iteration=6, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.1s AutomataMinimizationTime, 7 MinimizatonAttempts, 8 StatesRemovedByMinimization, 2 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.1s SsaConstructionTime, 0.4s SatisfiabilityAnalysisTime, 2.1s InterpolantComputationTime, 812 NumberOfCodeBlocks, 779 NumberOfCodeBlocksAsserted, 22 NumberOfCheckSat, 689 ConstructedInterpolants, 0 QuantifiedInterpolants, 116249 SizeOfPredicates, 20 NumberOfNonLiveVariables, 957 ConjunctsInSsa, 40 ConjunctsInUnsatCore, 12 InterpolantComputations, 2 PerfectInterpolantSequences, 2536/3048 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...