/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/id2_b3_o2.c -------------------------------------------------------------------------------- This is Ultimate 0.2.0-b8ad66e [2020-10-23 18:15:34,951 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-10-23 18:15:34,954 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-10-23 18:15:35,004 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-10-23 18:15:35,005 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-10-23 18:15:35,010 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-10-23 18:15:35,013 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-10-23 18:15:35,022 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-10-23 18:15:35,026 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-10-23 18:15:35,032 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-10-23 18:15:35,034 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-10-23 18:15:35,036 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-10-23 18:15:35,036 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-10-23 18:15:35,040 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-10-23 18:15:35,043 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-10-23 18:15:35,045 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-10-23 18:15:35,046 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-10-23 18:15:35,052 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-10-23 18:15:35,059 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-10-23 18:15:35,068 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-10-23 18:15:35,070 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-10-23 18:15:35,071 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-10-23 18:15:35,073 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-10-23 18:15:35,092 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-10-23 18:15:35,101 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-10-23 18:15:35,113 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-10-23 18:15:35,114 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-10-23 18:15:35,115 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-10-23 18:15:35,116 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-10-23 18:15:35,177 INFO L113 SettingsManager]: Loading preferences was successful [2020-10-23 18:15:35,177 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-10-23 18:15:35,182 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-10-23 18:15:35,183 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-10-23 18:15:35,183 INFO L138 SettingsManager]: * Use SBE=true [2020-10-23 18:15:35,183 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-10-23 18:15:35,183 INFO L138 SettingsManager]: * sizeof long=4 [2020-10-23 18:15:35,184 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-10-23 18:15:35,184 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-10-23 18:15:35,184 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-10-23 18:15:35,185 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-10-23 18:15:35,186 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-10-23 18:15:35,186 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-10-23 18:15:35,186 INFO L138 SettingsManager]: * sizeof long double=12 [2020-10-23 18:15:35,186 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-10-23 18:15:35,187 INFO L138 SettingsManager]: * Use constant arrays=true [2020-10-23 18:15:35,187 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-10-23 18:15:35,187 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-10-23 18:15:35,187 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-10-23 18:15:35,187 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-10-23 18:15:35,188 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-10-23 18:15:35,188 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-10-23 18:15:35,188 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-10-23 18:15:35,189 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-10-23 18:15:35,189 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-10-23 18:15:35,189 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-10-23 18:15:35,189 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-10-23 18:15:35,189 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-10-23 18:15:35,190 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-10-23 18:15:35,190 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release [2020-10-23 18:15:35,658 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-10-23 18:15:35,694 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-10-23 18:15:35,698 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-10-23 18:15:35,700 INFO L271 PluginConnector]: Initializing CDTParser... [2020-10-23 18:15:35,701 INFO L275 PluginConnector]: CDTParser initialized [2020-10-23 18:15:35,702 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive-simple/id2_b3_o2.c [2020-10-23 18:15:35,802 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/b6ff632eb/8de462808cb942baa51f5339e15b4082/FLAG8ae96f897 [2020-10-23 18:15:36,615 INFO L306 CDTParser]: Found 1 translation units. [2020-10-23 18:15:36,616 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/recursive-simple/id2_b3_o2.c [2020-10-23 18:15:36,626 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/b6ff632eb/8de462808cb942baa51f5339e15b4082/FLAG8ae96f897 [2020-10-23 18:15:36,940 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/b6ff632eb/8de462808cb942baa51f5339e15b4082 [2020-10-23 18:15:36,945 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-10-23 18:15:36,953 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-10-23 18:15:36,955 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-10-23 18:15:36,955 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-10-23 18:15:36,959 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-10-23 18:15:36,960 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.10 06:15:36" (1/1) ... [2020-10-23 18:15:36,964 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@45d27d29 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 06:15:36, skipping insertion in model container [2020-10-23 18:15:36,965 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.10 06:15:36" (1/1) ... [2020-10-23 18:15:36,974 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-10-23 18:15:36,989 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-10-23 18:15:37,170 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-10-23 18:15:37,182 INFO L203 MainTranslator]: Completed pre-run [2020-10-23 18:15:37,202 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-10-23 18:15:37,219 INFO L208 MainTranslator]: Completed translation [2020-10-23 18:15:37,220 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 06:15:37 WrapperNode [2020-10-23 18:15:37,220 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-10-23 18:15:37,221 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-10-23 18:15:37,222 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-10-23 18:15:37,222 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-10-23 18:15:37,236 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 06:15:37" (1/1) ... [2020-10-23 18:15:37,236 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 06:15:37" (1/1) ... [2020-10-23 18:15:37,244 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 06:15:37" (1/1) ... [2020-10-23 18:15:37,245 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 06:15:37" (1/1) ... [2020-10-23 18:15:37,252 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 06:15:37" (1/1) ... [2020-10-23 18:15:37,254 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 06:15:37" (1/1) ... [2020-10-23 18:15:37,255 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 06:15:37" (1/1) ... [2020-10-23 18:15:37,258 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-10-23 18:15:37,259 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-10-23 18:15:37,259 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-10-23 18:15:37,259 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-10-23 18:15:37,260 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 06:15:37" (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 18:15:37,364 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-10-23 18:15:37,365 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-10-23 18:15:37,365 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2020-10-23 18:15:37,365 INFO L138 BoogieDeclarations]: Found implementation of procedure id [2020-10-23 18:15:37,366 INFO L138 BoogieDeclarations]: Found implementation of procedure id2 [2020-10-23 18:15:37,366 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-10-23 18:15:37,366 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_uint [2020-10-23 18:15:37,366 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-10-23 18:15:37,367 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2020-10-23 18:15:37,367 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2020-10-23 18:15:37,367 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-10-23 18:15:37,369 INFO L130 BoogieDeclarations]: Found specification of procedure id [2020-10-23 18:15:37,369 INFO L130 BoogieDeclarations]: Found specification of procedure id2 [2020-10-23 18:15:37,370 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-10-23 18:15:37,370 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-10-23 18:15:37,372 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2020-10-23 18:15:37,372 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-10-23 18:15:37,372 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-10-23 18:15:37,372 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-10-23 18:15:37,372 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-10-23 18:15:37,910 INFO L293 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-10-23 18:15:37,912 INFO L298 CfgBuilder]: Removed 0 assume(true) statements. [2020-10-23 18:15:37,914 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.10 06:15:37 BoogieIcfgContainer [2020-10-23 18:15:37,914 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-10-23 18:15:37,919 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-10-23 18:15:37,919 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-10-23 18:15:37,924 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-10-23 18:15:37,925 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.10 06:15:36" (1/3) ... [2020-10-23 18:15:37,930 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4b454abd and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.10 06:15:37, skipping insertion in model container [2020-10-23 18:15:37,931 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 06:15:37" (2/3) ... [2020-10-23 18:15:37,932 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4b454abd and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.10 06:15:37, skipping insertion in model container [2020-10-23 18:15:37,933 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.10 06:15:37" (3/3) ... [2020-10-23 18:15:37,939 INFO L111 eAbstractionObserver]: Analyzing ICFG id2_b3_o2.c [2020-10-23 18:15:37,982 INFO L164 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2020-10-23 18:15:37,993 INFO L176 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-10-23 18:15:38,008 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-10-23 18:15:38,056 INFO L377 AbstractCegarLoop]: Interprodecural is true [2020-10-23 18:15:38,056 INFO L378 AbstractCegarLoop]: Hoare is true [2020-10-23 18:15:38,056 INFO L379 AbstractCegarLoop]: Compute interpolants for FPandBP [2020-10-23 18:15:38,056 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-10-23 18:15:38,057 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-10-23 18:15:38,057 INFO L382 AbstractCegarLoop]: Difference is false [2020-10-23 18:15:38,057 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-10-23 18:15:38,057 INFO L387 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-10-23 18:15:38,085 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states. [2020-10-23 18:15:38,095 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2020-10-23 18:15:38,095 INFO L414 BasicCegarLoop]: Found error trace [2020-10-23 18:15:38,097 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-23 18:15:38,097 INFO L429 AbstractCegarLoop]: === Iteration 1 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-23 18:15:38,109 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-23 18:15:38,110 INFO L82 PathProgramCache]: Analyzing trace with hash 791772439, now seen corresponding path program 1 times [2020-10-23 18:15:38,124 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-10-23 18:15:38,125 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1117752913] [2020-10-23 18:15:38,125 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-23 18:15:38,349 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 18:15:38,602 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-23 18:15:38,615 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 18:15:38,645 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-10-23 18:15:38,657 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 18:15:38,701 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 18:15:38,703 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1117752913] [2020-10-23 18:15:38,704 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-10-23 18:15:38,705 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2020-10-23 18:15:38,707 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1715930910] [2020-10-23 18:15:38,714 INFO L461 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-10-23 18:15:38,714 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-10-23 18:15:38,731 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-10-23 18:15:38,732 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2020-10-23 18:15:38,735 INFO L87 Difference]: Start difference. First operand 33 states. Second operand 6 states. [2020-10-23 18:15:39,068 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-23 18:15:39,069 INFO L93 Difference]: Finished difference Result 46 states and 53 transitions. [2020-10-23 18:15:39,069 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-10-23 18:15:39,071 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 15 [2020-10-23 18:15:39,072 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-23 18:15:39,083 INFO L225 Difference]: With dead ends: 46 [2020-10-23 18:15:39,084 INFO L226 Difference]: Without dead ends: 28 [2020-10-23 18:15:39,088 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 [2020-10-23 18:15:39,111 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2020-10-23 18:15:39,144 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2020-10-23 18:15:39,146 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2020-10-23 18:15:39,148 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 32 transitions. [2020-10-23 18:15:39,150 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 32 transitions. Word has length 15 [2020-10-23 18:15:39,150 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-23 18:15:39,150 INFO L481 AbstractCegarLoop]: Abstraction has 28 states and 32 transitions. [2020-10-23 18:15:39,151 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-10-23 18:15:39,151 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 32 transitions. [2020-10-23 18:15:39,153 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-10-23 18:15:39,153 INFO L414 BasicCegarLoop]: Found error trace [2020-10-23 18:15:39,154 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-23 18:15:39,154 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-10-23 18:15:39,155 INFO L429 AbstractCegarLoop]: === Iteration 2 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-23 18:15:39,156 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-23 18:15:39,156 INFO L82 PathProgramCache]: Analyzing trace with hash 2001775916, now seen corresponding path program 1 times [2020-10-23 18:15:39,156 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-10-23 18:15:39,157 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [119335048] [2020-10-23 18:15:39,157 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-23 18:15:39,185 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 18:15:39,270 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-23 18:15:39,282 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 18:15:39,301 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-10-23 18:15:39,326 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 18:15:39,402 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-10-23 18:15:39,417 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 18:15:39,455 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 18:15:39,456 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [119335048] [2020-10-23 18:15:39,457 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-10-23 18:15:39,457 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2020-10-23 18:15:39,460 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [715112657] [2020-10-23 18:15:39,462 INFO L461 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-10-23 18:15:39,462 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-10-23 18:15:39,464 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-10-23 18:15:39,464 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2020-10-23 18:15:39,465 INFO L87 Difference]: Start difference. First operand 28 states and 32 transitions. Second operand 6 states. [2020-10-23 18:15:39,781 WARN L193 SmtUtils]: Spent 147.00 ms on a formula simplification that was a NOOP. DAG size: 35 [2020-10-23 18:15:39,986 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-23 18:15:39,986 INFO L93 Difference]: Finished difference Result 47 states and 55 transitions. [2020-10-23 18:15:39,988 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-10-23 18:15:39,989 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 22 [2020-10-23 18:15:39,990 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-23 18:15:39,992 INFO L225 Difference]: With dead ends: 47 [2020-10-23 18:15:39,992 INFO L226 Difference]: Without dead ends: 34 [2020-10-23 18:15:39,994 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=21, Invalid=51, Unknown=0, NotChecked=0, Total=72 [2020-10-23 18:15:39,995 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2020-10-23 18:15:40,016 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 32. [2020-10-23 18:15:40,019 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2020-10-23 18:15:40,023 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 36 transitions. [2020-10-23 18:15:40,023 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 36 transitions. Word has length 22 [2020-10-23 18:15:40,023 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-23 18:15:40,024 INFO L481 AbstractCegarLoop]: Abstraction has 32 states and 36 transitions. [2020-10-23 18:15:40,024 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-10-23 18:15:40,024 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 36 transitions. [2020-10-23 18:15:40,029 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-10-23 18:15:40,030 INFO L414 BasicCegarLoop]: Found error trace [2020-10-23 18:15:40,030 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-23 18:15:40,031 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-10-23 18:15:40,031 INFO L429 AbstractCegarLoop]: === Iteration 3 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-23 18:15:40,032 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-23 18:15:40,033 INFO L82 PathProgramCache]: Analyzing trace with hash -1405687699, now seen corresponding path program 1 times [2020-10-23 18:15:40,035 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-10-23 18:15:40,036 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1141451398] [2020-10-23 18:15:40,036 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-23 18:15:40,079 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 18:15:40,169 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-23 18:15:40,174 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 18:15:40,181 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-10-23 18:15:40,188 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 18:15:40,282 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-10-23 18:15:40,288 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 18:15:40,314 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 18:15:40,315 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1141451398] [2020-10-23 18:15:40,315 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-10-23 18:15:40,316 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2020-10-23 18:15:40,316 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1760123472] [2020-10-23 18:15:40,317 INFO L461 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-10-23 18:15:40,317 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-10-23 18:15:40,318 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-10-23 18:15:40,318 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=57, Unknown=0, NotChecked=0, Total=72 [2020-10-23 18:15:40,319 INFO L87 Difference]: Start difference. First operand 32 states and 36 transitions. Second operand 9 states. [2020-10-23 18:15:40,871 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-23 18:15:40,872 INFO L93 Difference]: Finished difference Result 39 states and 43 transitions. [2020-10-23 18:15:40,873 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-10-23 18:15:40,873 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 22 [2020-10-23 18:15:40,874 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-23 18:15:40,875 INFO L225 Difference]: With dead ends: 39 [2020-10-23 18:15:40,876 INFO L226 Difference]: Without dead ends: 34 [2020-10-23 18:15:40,877 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=41, Invalid=169, Unknown=0, NotChecked=0, Total=210 [2020-10-23 18:15:40,877 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2020-10-23 18:15:40,892 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 32. [2020-10-23 18:15:40,893 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2020-10-23 18:15:40,894 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 36 transitions. [2020-10-23 18:15:40,894 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 36 transitions. Word has length 22 [2020-10-23 18:15:40,895 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-23 18:15:40,895 INFO L481 AbstractCegarLoop]: Abstraction has 32 states and 36 transitions. [2020-10-23 18:15:40,895 INFO L482 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-10-23 18:15:40,895 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 36 transitions. [2020-10-23 18:15:40,896 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2020-10-23 18:15:40,897 INFO L414 BasicCegarLoop]: Found error trace [2020-10-23 18:15:40,897 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] [2020-10-23 18:15:40,897 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-10-23 18:15:40,898 INFO L429 AbstractCegarLoop]: === Iteration 4 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-23 18:15:40,898 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-23 18:15:40,899 INFO L82 PathProgramCache]: Analyzing trace with hash 20115896, now seen corresponding path program 1 times [2020-10-23 18:15:40,899 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-10-23 18:15:40,899 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1617418001] [2020-10-23 18:15:40,900 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-23 18:15:40,922 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 18:15:40,968 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-23 18:15:40,974 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 18:15:40,989 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-10-23 18:15:41,013 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 18:15:41,025 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-10-23 18:15:41,032 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 18:15:41,079 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-10-23 18:15:41,084 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 18:15:41,120 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-10-23 18:15:41,121 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1617418001] [2020-10-23 18:15:41,121 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-10-23 18:15:41,121 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2020-10-23 18:15:41,122 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1657354821] [2020-10-23 18:15:41,123 INFO L461 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-10-23 18:15:41,124 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-10-23 18:15:41,125 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-10-23 18:15:41,126 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2020-10-23 18:15:41,126 INFO L87 Difference]: Start difference. First operand 32 states and 36 transitions. Second operand 6 states. [2020-10-23 18:15:41,466 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-23 18:15:41,467 INFO L93 Difference]: Finished difference Result 51 states and 58 transitions. [2020-10-23 18:15:41,467 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-10-23 18:15:41,467 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 29 [2020-10-23 18:15:41,468 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-23 18:15:41,469 INFO L225 Difference]: With dead ends: 51 [2020-10-23 18:15:41,469 INFO L226 Difference]: Without dead ends: 38 [2020-10-23 18:15:41,470 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 11 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=21, Invalid=51, Unknown=0, NotChecked=0, Total=72 [2020-10-23 18:15:41,471 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-10-23 18:15:41,479 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 36. [2020-10-23 18:15:41,479 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-10-23 18:15:41,480 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 40 transitions. [2020-10-23 18:15:41,481 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 40 transitions. Word has length 29 [2020-10-23 18:15:41,481 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-23 18:15:41,481 INFO L481 AbstractCegarLoop]: Abstraction has 36 states and 40 transitions. [2020-10-23 18:15:41,481 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-10-23 18:15:41,482 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 40 transitions. [2020-10-23 18:15:41,483 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2020-10-23 18:15:41,483 INFO L414 BasicCegarLoop]: Found error trace [2020-10-23 18:15:41,483 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] [2020-10-23 18:15:41,483 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-10-23 18:15:41,484 INFO L429 AbstractCegarLoop]: === Iteration 5 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-23 18:15:41,484 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-23 18:15:41,484 INFO L82 PathProgramCache]: Analyzing trace with hash -1776835463, now seen corresponding path program 1 times [2020-10-23 18:15:41,485 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-10-23 18:15:41,485 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1265252677] [2020-10-23 18:15:41,485 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-23 18:15:41,504 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 18:15:41,564 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-23 18:15:41,567 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 18:15:41,576 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-10-23 18:15:41,598 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 18:15:41,676 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-10-23 18:15:41,682 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 18:15:41,731 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-10-23 18:15:41,735 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 18:15:41,760 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-10-23 18:15:41,761 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1265252677] [2020-10-23 18:15:41,761 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-10-23 18:15:41,761 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2020-10-23 18:15:41,762 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [238099878] [2020-10-23 18:15:41,762 INFO L461 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-10-23 18:15:41,762 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-10-23 18:15:41,763 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-10-23 18:15:41,763 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=57, Unknown=0, NotChecked=0, Total=72 [2020-10-23 18:15:41,764 INFO L87 Difference]: Start difference. First operand 36 states and 40 transitions. Second operand 9 states. [2020-10-23 18:15:42,293 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-23 18:15:42,293 INFO L93 Difference]: Finished difference Result 55 states and 63 transitions. [2020-10-23 18:15:42,295 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-10-23 18:15:42,295 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 29 [2020-10-23 18:15:42,296 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-23 18:15:42,297 INFO L225 Difference]: With dead ends: 55 [2020-10-23 18:15:42,297 INFO L226 Difference]: Without dead ends: 42 [2020-10-23 18:15:42,299 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=41, Invalid=169, Unknown=0, NotChecked=0, Total=210 [2020-10-23 18:15:42,300 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2020-10-23 18:15:42,311 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 40. [2020-10-23 18:15:42,311 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2020-10-23 18:15:42,313 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 44 transitions. [2020-10-23 18:15:42,313 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 44 transitions. Word has length 29 [2020-10-23 18:15:42,313 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-23 18:15:42,314 INFO L481 AbstractCegarLoop]: Abstraction has 40 states and 44 transitions. [2020-10-23 18:15:42,314 INFO L482 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-10-23 18:15:42,314 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 44 transitions. [2020-10-23 18:15:42,315 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2020-10-23 18:15:42,315 INFO L414 BasicCegarLoop]: Found error trace [2020-10-23 18:15:42,315 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] [2020-10-23 18:15:42,316 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-10-23 18:15:42,316 INFO L429 AbstractCegarLoop]: === Iteration 6 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-23 18:15:42,316 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-23 18:15:42,317 INFO L82 PathProgramCache]: Analyzing trace with hash -889331782, now seen corresponding path program 1 times [2020-10-23 18:15:42,317 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-10-23 18:15:42,317 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [246956702] [2020-10-23 18:15:42,318 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-23 18:15:42,337 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-10-23 18:15:42,338 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-10-23 18:15:42,356 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-10-23 18:15:42,356 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-10-23 18:15:42,395 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2020-10-23 18:15:42,396 INFO L523 BasicCegarLoop]: Counterexample might be feasible [2020-10-23 18:15:42,396 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-10-23 18:15:42,475 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 23.10 06:15:42 BoogieIcfgContainer [2020-10-23 18:15:42,475 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-10-23 18:15:42,480 INFO L168 Benchmark]: Toolchain (without parser) took 5529.84 ms. Allocated memory was 155.2 MB in the beginning and 189.8 MB in the end (delta: 34.6 MB). Free memory was 130.9 MB in the beginning and 128.3 MB in the end (delta: 2.6 MB). Peak memory consumption was 37.7 MB. Max. memory is 8.0 GB. [2020-10-23 18:15:42,483 INFO L168 Benchmark]: CDTParser took 0.20 ms. Allocated memory is still 155.2 MB. Free memory was 128.6 MB in the beginning and 128.5 MB in the end (delta: 109.2 kB). There was no memory consumed. Max. memory is 8.0 GB. [2020-10-23 18:15:42,485 INFO L168 Benchmark]: CACSL2BoogieTranslator took 265.74 ms. Allocated memory is still 155.2 MB. Free memory was 130.2 MB in the beginning and 121.0 MB in the end (delta: 9.1 MB). Peak memory consumption was 8.4 MB. Max. memory is 8.0 GB. [2020-10-23 18:15:42,492 INFO L168 Benchmark]: Boogie Preprocessor took 36.46 ms. Allocated memory is still 155.2 MB. Free memory was 121.0 MB in the beginning and 119.7 MB in the end (delta: 1.4 MB). Peak memory consumption was 2.1 MB. Max. memory is 8.0 GB. [2020-10-23 18:15:42,493 INFO L168 Benchmark]: RCFGBuilder took 655.72 ms. Allocated memory is still 155.2 MB. Free memory was 119.5 MB in the beginning and 138.5 MB in the end (delta: -19.0 MB). Peak memory consumption was 16.2 MB. Max. memory is 8.0 GB. [2020-10-23 18:15:42,494 INFO L168 Benchmark]: TraceAbstraction took 4556.42 ms. Allocated memory was 155.2 MB in the beginning and 189.8 MB in the end (delta: 34.6 MB). Free memory was 137.7 MB in the beginning and 128.3 MB in the end (delta: 9.5 MB). Peak memory consumption was 43.6 MB. Max. memory is 8.0 GB. [2020-10-23 18:15:42,502 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.20 ms. Allocated memory is still 155.2 MB. Free memory was 128.6 MB in the beginning and 128.5 MB in the end (delta: 109.2 kB). There was no memory consumed. Max. memory is 8.0 GB. * CACSL2BoogieTranslator took 265.74 ms. Allocated memory is still 155.2 MB. Free memory was 130.2 MB in the beginning and 121.0 MB in the end (delta: 9.1 MB). Peak memory consumption was 8.4 MB. Max. memory is 8.0 GB. * Boogie Preprocessor took 36.46 ms. Allocated memory is still 155.2 MB. Free memory was 121.0 MB in the beginning and 119.7 MB in the end (delta: 1.4 MB). Peak memory consumption was 2.1 MB. Max. memory is 8.0 GB. * RCFGBuilder took 655.72 ms. Allocated memory is still 155.2 MB. Free memory was 119.5 MB in the beginning and 138.5 MB in the end (delta: -19.0 MB). Peak memory consumption was 16.2 MB. Max. memory is 8.0 GB. * TraceAbstraction took 4556.42 ms. Allocated memory was 155.2 MB in the beginning and 189.8 MB in the end (delta: 34.6 MB). Free memory was 137.7 MB in the beginning and 128.3 MB in the end (delta: 9.5 MB). Peak memory consumption was 43.6 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: [L24] unsigned int input = __VERIFIER_nondet_uint(); [L25] CALL, EXPR id(input) VAL [\old(x)=2] [L10] COND FALSE !(x==0) VAL [\old(x)=2, x=2] [L11] CALL, EXPR id2(x-1) VAL [\old(x)=1] [L17] COND FALSE !(x==0) VAL [\old(x)=1, x=1] [L18] CALL, EXPR id(x-1) VAL [\old(x)=0] [L10] COND TRUE x==0 [L10] return 0; VAL [\old(x)=0, \result=0, x=0] [L18] RET, EXPR id(x-1) VAL [\old(x)=1, id(x-1)=0, x=1] [L18] unsigned int ret = id(x-1) + 1; [L19] COND FALSE !(ret > 3) [L20] return ret; VAL [\old(x)=1, \result=1, ret=1, x=1] [L11] RET, EXPR id2(x-1) VAL [\old(x)=2, id2(x-1)=1, x=2] [L11] unsigned int ret = id2(x-1) + 1; [L12] COND FALSE !(ret > 3) [L13] return ret; VAL [\old(x)=2, \result=2, ret=2, x=2] [L25] RET, EXPR id(input) VAL [id(input)=2, input=2] [L25] unsigned int result = id(input); [L26] COND TRUE result == 2 VAL [input=2, result=2] [L27] CALL reach_error() [L4] __assert_fail("0", "id2_b3_o2.c", 4, "reach_error") - StatisticsResult: Ultimate Automizer benchmark data CFG has 6 procedures, 33 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 4.3s, OverallIterations: 6, TraceHistogramMax: 2, AutomataDifference: 2.3s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 128 SDtfs, 115 SDslu, 185 SDs, 0 SdLazy, 556 SolverSat, 31 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.8s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 88 GetRequests, 41 SyntacticMatches, 0 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 37 ImplicationChecksByTransitivity, 1.6s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=40occurred in iteration=5, 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, 5 MinimizatonAttempts, 8 StatesRemovedByMinimization, 4 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.1s SatisfiabilityAnalysisTime, 1.2s InterpolantComputationTime, 146 NumberOfCodeBlocks, 146 NumberOfCodeBlocksAsserted, 6 NumberOfCheckSat, 112 ConstructedInterpolants, 0 QuantifiedInterpolants, 10150 SizeOfPredicates, 0 NumberOfNonLiveVariables, 0 ConjunctsInSsa, 0 ConjunctsInUnsatCore, 5 InterpolantComputations, 5 PerfectInterpolantSequences, 8/8 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...