/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_i5_o5-1.c -------------------------------------------------------------------------------- This is Ultimate 0.2.0-7d8eed3 [2020-11-06 22:19:05,707 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-11-06 22:19:05,710 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-11-06 22:19:05,750 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-11-06 22:19:05,751 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-11-06 22:19:05,753 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-11-06 22:19:05,755 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-11-06 22:19:05,757 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-11-06 22:19:05,760 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-11-06 22:19:05,761 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-11-06 22:19:05,762 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-11-06 22:19:05,764 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-11-06 22:19:05,764 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-11-06 22:19:05,766 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-11-06 22:19:05,767 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-11-06 22:19:05,769 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-11-06 22:19:05,770 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-11-06 22:19:05,771 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-11-06 22:19:05,773 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-11-06 22:19:05,776 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-11-06 22:19:05,778 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-11-06 22:19:05,779 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-11-06 22:19:05,781 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-11-06 22:19:05,782 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-11-06 22:19:05,810 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-11-06 22:19:05,821 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-11-06 22:19:05,822 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-11-06 22:19:05,823 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-11-06 22:19:05,824 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-11-06 22:19:05,854 INFO L113 SettingsManager]: Loading preferences was successful [2020-11-06 22:19:05,854 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-11-06 22:19:05,856 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-11-06 22:19:05,856 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-11-06 22:19:05,856 INFO L138 SettingsManager]: * Use SBE=true [2020-11-06 22:19:05,857 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-11-06 22:19:05,857 INFO L138 SettingsManager]: * sizeof long=4 [2020-11-06 22:19:05,857 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-11-06 22:19:05,857 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-11-06 22:19:05,857 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-11-06 22:19:05,858 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-11-06 22:19:05,858 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-11-06 22:19:05,858 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-11-06 22:19:05,858 INFO L138 SettingsManager]: * sizeof long double=12 [2020-11-06 22:19:05,859 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-11-06 22:19:05,859 INFO L138 SettingsManager]: * Use constant arrays=true [2020-11-06 22:19:05,859 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-11-06 22:19:05,859 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-11-06 22:19:05,860 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-11-06 22:19:05,860 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-11-06 22:19:05,860 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-11-06 22:19:05,860 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-11-06 22:19:05,860 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-11-06 22:19:05,861 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-11-06 22:19:05,861 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-11-06 22:19:05,861 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-11-06 22:19:05,861 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-11-06 22:19:05,862 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-11-06 22:19:05,862 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-11-06 22:19:05,862 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release [2020-11-06 22:19:06,257 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-11-06 22:19:06,284 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-11-06 22:19:06,288 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-11-06 22:19:06,289 INFO L271 PluginConnector]: Initializing CDTParser... [2020-11-06 22:19:06,290 INFO L275 PluginConnector]: CDTParser initialized [2020-11-06 22:19:06,291 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive-simple/id2_i5_o5-1.c [2020-11-06 22:19:06,382 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/b752e3210/913a6bdb1f0d476d94c535f8b58763b3/FLAGd489f88f7 [2020-11-06 22:19:06,990 INFO L306 CDTParser]: Found 1 translation units. [2020-11-06 22:19:06,991 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/recursive-simple/id2_i5_o5-1.c [2020-11-06 22:19:06,999 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/b752e3210/913a6bdb1f0d476d94c535f8b58763b3/FLAGd489f88f7 [2020-11-06 22:19:07,377 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/b752e3210/913a6bdb1f0d476d94c535f8b58763b3 [2020-11-06 22:19:07,381 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-11-06 22:19:07,391 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-11-06 22:19:07,398 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-11-06 22:19:07,399 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-11-06 22:19:07,404 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-11-06 22:19:07,405 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.11 10:19:07" (1/1) ... [2020-11-06 22:19:07,410 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@488c1b3c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 10:19:07, skipping insertion in model container [2020-11-06 22:19:07,410 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.11 10:19:07" (1/1) ... [2020-11-06 22:19:07,419 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-11-06 22:19:07,437 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-11-06 22:19:07,596 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-11-06 22:19:07,611 INFO L203 MainTranslator]: Completed pre-run [2020-11-06 22:19:07,633 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-11-06 22:19:07,655 INFO L208 MainTranslator]: Completed translation [2020-11-06 22:19:07,657 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 10:19:07 WrapperNode [2020-11-06 22:19:07,657 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-11-06 22:19:07,660 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-11-06 22:19:07,661 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-11-06 22:19:07,661 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-11-06 22:19:07,675 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 10:19:07" (1/1) ... [2020-11-06 22:19:07,678 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 10:19:07" (1/1) ... [2020-11-06 22:19:07,689 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 10:19:07" (1/1) ... [2020-11-06 22:19:07,689 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 10:19:07" (1/1) ... [2020-11-06 22:19:07,704 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 10:19:07" (1/1) ... [2020-11-06 22:19:07,710 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 10:19:07" (1/1) ... [2020-11-06 22:19:07,719 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 10:19:07" (1/1) ... [2020-11-06 22:19:07,723 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-11-06 22:19:07,724 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-11-06 22:19:07,725 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-11-06 22:19:07,725 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-11-06 22:19:07,727 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 10:19:07" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-11-06 22:19:07,800 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-11-06 22:19:07,801 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-11-06 22:19:07,801 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2020-11-06 22:19:07,801 INFO L138 BoogieDeclarations]: Found implementation of procedure id [2020-11-06 22:19:07,801 INFO L138 BoogieDeclarations]: Found implementation of procedure id2 [2020-11-06 22:19:07,801 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-11-06 22:19:07,801 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-11-06 22:19:07,802 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-11-06 22:19:07,802 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2020-11-06 22:19:07,802 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2020-11-06 22:19:07,802 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-11-06 22:19:07,802 INFO L130 BoogieDeclarations]: Found specification of procedure id [2020-11-06 22:19:07,803 INFO L130 BoogieDeclarations]: Found specification of procedure id2 [2020-11-06 22:19:07,803 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-11-06 22:19:07,803 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-11-06 22:19:07,803 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2020-11-06 22:19:07,803 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-11-06 22:19:07,804 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-11-06 22:19:07,804 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-11-06 22:19:07,804 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-11-06 22:19:08,056 INFO L293 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-11-06 22:19:08,057 INFO L298 CfgBuilder]: Removed 0 assume(true) statements. [2020-11-06 22:19:08,059 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.11 10:19:08 BoogieIcfgContainer [2020-11-06 22:19:08,059 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-11-06 22:19:08,061 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-11-06 22:19:08,061 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-11-06 22:19:08,088 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-11-06 22:19:08,089 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 06.11 10:19:07" (1/3) ... [2020-11-06 22:19:08,090 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4fadfa9b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.11 10:19:08, skipping insertion in model container [2020-11-06 22:19:08,090 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 10:19:07" (2/3) ... [2020-11-06 22:19:08,093 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4fadfa9b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.11 10:19:08, skipping insertion in model container [2020-11-06 22:19:08,094 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.11 10:19:08" (3/3) ... [2020-11-06 22:19:08,099 INFO L111 eAbstractionObserver]: Analyzing ICFG id2_i5_o5-1.c [2020-11-06 22:19:08,160 INFO L179 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2020-11-06 22:19:08,169 INFO L191 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-11-06 22:19:08,196 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-11-06 22:19:08,262 INFO L377 AbstractCegarLoop]: Interprodecural is true [2020-11-06 22:19:08,262 INFO L378 AbstractCegarLoop]: Hoare is true [2020-11-06 22:19:08,263 INFO L379 AbstractCegarLoop]: Compute interpolants for FPandBP [2020-11-06 22:19:08,263 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-11-06 22:19:08,266 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-11-06 22:19:08,266 INFO L382 AbstractCegarLoop]: Difference is false [2020-11-06 22:19:08,266 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-11-06 22:19:08,267 INFO L387 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-11-06 22:19:08,298 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states. [2020-11-06 22:19:08,309 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2020-11-06 22:19:08,309 INFO L414 BasicCegarLoop]: Found error trace [2020-11-06 22:19:08,310 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-06 22:19:08,311 INFO L429 AbstractCegarLoop]: === Iteration 1 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-06 22:19:08,325 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-06 22:19:08,326 INFO L82 PathProgramCache]: Analyzing trace with hash 1481297807, now seen corresponding path program 1 times [2020-11-06 22:19:08,339 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-06 22:19:08,341 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1743290746] [2020-11-06 22:19:08,342 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-06 22:19:08,532 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:19:08,752 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-06 22:19:08,758 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:19:08,772 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-11-06 22:19:08,776 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:19:08,807 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-06 22:19:08,808 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1743290746] [2020-11-06 22:19:08,808 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-11-06 22:19:08,809 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2020-11-06 22:19:08,810 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1821524876] [2020-11-06 22:19:08,815 INFO L461 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-11-06 22:19:08,815 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-11-06 22:19:08,831 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-11-06 22:19:08,832 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2020-11-06 22:19:08,835 INFO L87 Difference]: Start difference. First operand 31 states. Second operand 6 states. [2020-11-06 22:19:09,138 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-06 22:19:09,139 INFO L93 Difference]: Finished difference Result 44 states and 49 transitions. [2020-11-06 22:19:09,139 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-11-06 22:19:09,141 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 15 [2020-11-06 22:19:09,141 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-06 22:19:09,150 INFO L225 Difference]: With dead ends: 44 [2020-11-06 22:19:09,151 INFO L226 Difference]: Without dead ends: 26 [2020-11-06 22:19:09,154 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=21, Invalid=51, Unknown=0, NotChecked=0, Total=72 [2020-11-06 22:19:09,174 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2020-11-06 22:19:09,202 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2020-11-06 22:19:09,204 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-11-06 22:19:09,205 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 28 transitions. [2020-11-06 22:19:09,207 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 28 transitions. Word has length 15 [2020-11-06 22:19:09,207 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-06 22:19:09,208 INFO L481 AbstractCegarLoop]: Abstraction has 26 states and 28 transitions. [2020-11-06 22:19:09,208 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-11-06 22:19:09,208 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 28 transitions. [2020-11-06 22:19:09,210 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-11-06 22:19:09,210 INFO L414 BasicCegarLoop]: Found error trace [2020-11-06 22:19:09,210 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] [2020-11-06 22:19:09,210 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-11-06 22:19:09,211 INFO L429 AbstractCegarLoop]: === Iteration 2 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-06 22:19:09,212 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-06 22:19:09,212 INFO L82 PathProgramCache]: Analyzing trace with hash 262491562, now seen corresponding path program 1 times [2020-11-06 22:19:09,212 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-06 22:19:09,212 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [689509045] [2020-11-06 22:19:09,213 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-06 22:19:09,236 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:19:09,302 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-06 22:19:09,311 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:19:09,331 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-11-06 22:19:09,342 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:19:09,385 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-11-06 22:19:09,393 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:19:09,444 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-06 22:19:09,445 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [689509045] [2020-11-06 22:19:09,445 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-11-06 22:19:09,445 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2020-11-06 22:19:09,446 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [349336147] [2020-11-06 22:19:09,447 INFO L461 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-11-06 22:19:09,448 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-11-06 22:19:09,449 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-11-06 22:19:09,450 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2020-11-06 22:19:09,450 INFO L87 Difference]: Start difference. First operand 26 states and 28 transitions. Second operand 8 states. [2020-11-06 22:19:09,813 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-06 22:19:09,813 INFO L93 Difference]: Finished difference Result 36 states and 38 transitions. [2020-11-06 22:19:09,813 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-11-06 22:19:09,814 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 21 [2020-11-06 22:19:09,814 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-06 22:19:09,815 INFO L225 Difference]: With dead ends: 36 [2020-11-06 22:19:09,816 INFO L226 Difference]: Without dead ends: 31 [2020-11-06 22:19:09,817 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=37, Invalid=119, Unknown=0, NotChecked=0, Total=156 [2020-11-06 22:19:09,818 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2020-11-06 22:19:09,826 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 29. [2020-11-06 22:19:09,826 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2020-11-06 22:19:09,827 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 31 transitions. [2020-11-06 22:19:09,828 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 31 transitions. Word has length 21 [2020-11-06 22:19:09,828 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-06 22:19:09,828 INFO L481 AbstractCegarLoop]: Abstraction has 29 states and 31 transitions. [2020-11-06 22:19:09,828 INFO L482 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-11-06 22:19:09,828 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 31 transitions. [2020-11-06 22:19:09,829 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-11-06 22:19:09,830 INFO L414 BasicCegarLoop]: Found error trace [2020-11-06 22:19:09,830 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] [2020-11-06 22:19:09,830 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-11-06 22:19:09,830 INFO L429 AbstractCegarLoop]: === Iteration 3 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-06 22:19:09,831 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-06 22:19:09,831 INFO L82 PathProgramCache]: Analyzing trace with hash -1067256061, now seen corresponding path program 1 times [2020-11-06 22:19:09,831 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-06 22:19:09,832 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1304845621] [2020-11-06 22:19:09,832 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-06 22:19:09,855 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:19:09,901 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-06 22:19:09,904 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:19:09,910 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-11-06 22:19:09,918 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:19:09,939 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-11-06 22:19:09,944 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:19:09,968 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-11-06 22:19:09,971 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:19:09,988 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-11-06 22:19:09,988 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1304845621] [2020-11-06 22:19:09,989 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [945987989] [2020-11-06 22:19:09,989 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-11-06 22:19:10,051 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:19:10,054 INFO L263 TraceCheckSpWp]: Trace formula consists of 126 conjuncts, 8 conjunts are in the unsatisfiable core [2020-11-06 22:19:10,064 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-06 22:19:10,198 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-11-06 22:19:10,199 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-11-06 22:19:10,199 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8] total 12 [2020-11-06 22:19:10,199 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2028325908] [2020-11-06 22:19:10,200 INFO L461 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-11-06 22:19:10,200 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-11-06 22:19:10,201 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-11-06 22:19:10,201 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=106, Unknown=0, NotChecked=0, Total=132 [2020-11-06 22:19:10,201 INFO L87 Difference]: Start difference. First operand 29 states and 31 transitions. Second operand 12 states. [2020-11-06 22:19:10,423 WARN L194 SmtUtils]: Spent 111.00 ms on a formula simplification that was a NOOP. DAG size: 34 [2020-11-06 22:19:10,815 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-06 22:19:10,816 INFO L93 Difference]: Finished difference Result 42 states and 44 transitions. [2020-11-06 22:19:10,816 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-11-06 22:19:10,817 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 27 [2020-11-06 22:19:10,817 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-06 22:19:10,818 INFO L225 Difference]: With dead ends: 42 [2020-11-06 22:19:10,818 INFO L226 Difference]: Without dead ends: 37 [2020-11-06 22:19:10,819 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 30 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=64, Invalid=242, Unknown=0, NotChecked=0, Total=306 [2020-11-06 22:19:10,820 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2020-11-06 22:19:10,827 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 32. [2020-11-06 22:19:10,828 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2020-11-06 22:19:10,829 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 34 transitions. [2020-11-06 22:19:10,829 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 34 transitions. Word has length 27 [2020-11-06 22:19:10,830 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-06 22:19:10,830 INFO L481 AbstractCegarLoop]: Abstraction has 32 states and 34 transitions. [2020-11-06 22:19:10,830 INFO L482 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-11-06 22:19:10,830 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 34 transitions. [2020-11-06 22:19:10,832 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2020-11-06 22:19:10,832 INFO L414 BasicCegarLoop]: Found error trace [2020-11-06 22:19:10,832 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-06 22:19:11,039 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2 [2020-11-06 22:19:11,040 INFO L429 AbstractCegarLoop]: === Iteration 4 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-06 22:19:11,042 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-06 22:19:11,042 INFO L82 PathProgramCache]: Analyzing trace with hash -1416908450, now seen corresponding path program 1 times [2020-11-06 22:19:11,043 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-06 22:19:11,043 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [72456193] [2020-11-06 22:19:11,044 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-06 22:19:11,066 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:19:11,145 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-06 22:19:11,148 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:19:11,153 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-11-06 22:19:11,161 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:19:11,188 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-11-06 22:19:11,195 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:19:11,228 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-11-06 22:19:11,232 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:19:11,255 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-11-06 22:19:11,258 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:19:11,280 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-11-06 22:19:11,281 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [72456193] [2020-11-06 22:19:11,281 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [397086454] [2020-11-06 22:19:11,281 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-11-06 22:19:11,338 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:19:11,340 INFO L263 TraceCheckSpWp]: Trace formula consists of 140 conjuncts, 10 conjunts are in the unsatisfiable core [2020-11-06 22:19:11,343 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-06 22:19:11,430 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-11-06 22:19:11,431 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-11-06 22:19:11,431 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9] total 13 [2020-11-06 22:19:11,431 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1354330019] [2020-11-06 22:19:11,432 INFO L461 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-11-06 22:19:11,432 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-11-06 22:19:11,433 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-11-06 22:19:11,433 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=127, Unknown=0, NotChecked=0, Total=156 [2020-11-06 22:19:11,433 INFO L87 Difference]: Start difference. First operand 32 states and 34 transitions. Second operand 13 states. [2020-11-06 22:19:11,887 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-06 22:19:11,887 INFO L93 Difference]: Finished difference Result 48 states and 50 transitions. [2020-11-06 22:19:11,888 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-11-06 22:19:11,888 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 33 [2020-11-06 22:19:11,888 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-06 22:19:11,890 INFO L225 Difference]: With dead ends: 48 [2020-11-06 22:19:11,890 INFO L226 Difference]: Without dead ends: 43 [2020-11-06 22:19:11,891 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 38 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 41 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=76, Invalid=304, Unknown=0, NotChecked=0, Total=380 [2020-11-06 22:19:11,891 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2020-11-06 22:19:11,898 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 35. [2020-11-06 22:19:11,898 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-11-06 22:19:11,899 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 37 transitions. [2020-11-06 22:19:11,900 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 37 transitions. Word has length 33 [2020-11-06 22:19:11,900 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-06 22:19:11,900 INFO L481 AbstractCegarLoop]: Abstraction has 35 states and 37 transitions. [2020-11-06 22:19:11,900 INFO L482 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-11-06 22:19:11,900 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 37 transitions. [2020-11-06 22:19:11,902 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2020-11-06 22:19:11,902 INFO L414 BasicCegarLoop]: Found error trace [2020-11-06 22:19:11,902 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-06 22:19:12,115 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-11-06 22:19:12,116 INFO L429 AbstractCegarLoop]: === Iteration 5 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-06 22:19:12,117 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-06 22:19:12,117 INFO L82 PathProgramCache]: Analyzing trace with hash 1482575991, now seen corresponding path program 2 times [2020-11-06 22:19:12,118 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-06 22:19:12,119 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1225669626] [2020-11-06 22:19:12,119 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-06 22:19:12,139 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:19:12,194 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-06 22:19:12,197 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:19:12,201 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-11-06 22:19:12,208 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:19:12,232 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-11-06 22:19:12,237 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:19:12,264 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-11-06 22:19:12,269 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:19:12,286 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-11-06 22:19:12,290 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:19:12,306 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-11-06 22:19:12,309 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:19:12,345 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2020-11-06 22:19:12,346 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1225669626] [2020-11-06 22:19:12,346 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [977661539] [2020-11-06 22:19:12,349 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 [2020-11-06 22:19:12,412 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2020-11-06 22:19:12,413 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-11-06 22:19:12,414 INFO L263 TraceCheckSpWp]: Trace formula consists of 154 conjuncts, 12 conjunts are in the unsatisfiable core [2020-11-06 22:19:12,416 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-06 22:19:12,547 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2020-11-06 22:19:12,547 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-11-06 22:19:12,547 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 10] total 14 [2020-11-06 22:19:12,548 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [727546214] [2020-11-06 22:19:12,548 INFO L461 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-11-06 22:19:12,549 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-11-06 22:19:12,549 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-11-06 22:19:12,549 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=148, Unknown=0, NotChecked=0, Total=182 [2020-11-06 22:19:12,550 INFO L87 Difference]: Start difference. First operand 35 states and 37 transitions. Second operand 14 states. [2020-11-06 22:19:13,132 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-06 22:19:13,133 INFO L93 Difference]: Finished difference Result 54 states and 56 transitions. [2020-11-06 22:19:13,133 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-11-06 22:19:13,133 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 39 [2020-11-06 22:19:13,134 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-06 22:19:13,135 INFO L225 Difference]: With dead ends: 54 [2020-11-06 22:19:13,135 INFO L226 Difference]: Without dead ends: 49 [2020-11-06 22:19:13,136 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 66 GetRequests, 46 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 58 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=92, Invalid=370, Unknown=0, NotChecked=0, Total=462 [2020-11-06 22:19:13,137 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2020-11-06 22:19:13,144 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 38. [2020-11-06 22:19:13,144 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2020-11-06 22:19:13,145 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 40 transitions. [2020-11-06 22:19:13,145 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 40 transitions. Word has length 39 [2020-11-06 22:19:13,154 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-06 22:19:13,154 INFO L481 AbstractCegarLoop]: Abstraction has 38 states and 40 transitions. [2020-11-06 22:19:13,154 INFO L482 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-11-06 22:19:13,154 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 40 transitions. [2020-11-06 22:19:13,156 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2020-11-06 22:19:13,157 INFO L414 BasicCegarLoop]: Found error trace [2020-11-06 22:19:13,157 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-06 22:19:13,357 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-11-06 22:19:13,358 INFO L429 AbstractCegarLoop]: === Iteration 6 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-06 22:19:13,359 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-06 22:19:13,359 INFO L82 PathProgramCache]: Analyzing trace with hash -487565550, now seen corresponding path program 2 times [2020-11-06 22:19:13,359 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-06 22:19:13,360 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1394596773] [2020-11-06 22:19:13,360 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-06 22:19:13,392 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-11-06 22:19:13,393 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-11-06 22:19:13,423 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-11-06 22:19:13,423 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-11-06 22:19:13,464 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2020-11-06 22:19:13,464 INFO L523 BasicCegarLoop]: Counterexample might be feasible [2020-11-06 22:19:13,464 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-11-06 22:19:13,529 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 06.11 10:19:13 BoogieIcfgContainer [2020-11-06 22:19:13,529 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-11-06 22:19:13,531 INFO L168 Benchmark]: Toolchain (without parser) took 6145.31 ms. Allocated memory was 156.2 MB in the beginning and 200.3 MB in the end (delta: 44.0 MB). Free memory was 131.6 MB in the beginning and 146.9 MB in the end (delta: -15.2 MB). Peak memory consumption was 29.4 MB. Max. memory is 8.0 GB. [2020-11-06 22:19:13,531 INFO L168 Benchmark]: CDTParser took 0.21 ms. Allocated memory is still 156.2 MB. Free memory was 130.0 MB in the beginning and 129.9 MB in the end (delta: 84.5 kB). There was no memory consumed. Max. memory is 8.0 GB. [2020-11-06 22:19:13,532 INFO L168 Benchmark]: CACSL2BoogieTranslator took 259.03 ms. Allocated memory is still 156.2 MB. Free memory was 131.0 MB in the beginning and 121.9 MB in the end (delta: 9.1 MB). Peak memory consumption was 8.4 MB. Max. memory is 8.0 GB. [2020-11-06 22:19:13,533 INFO L168 Benchmark]: Boogie Preprocessor took 62.80 ms. Allocated memory is still 156.2 MB. Free memory was 121.9 MB in the beginning and 120.5 MB in the end (delta: 1.4 MB). Peak memory consumption was 2.1 MB. Max. memory is 8.0 GB. [2020-11-06 22:19:13,534 INFO L168 Benchmark]: RCFGBuilder took 334.58 ms. Allocated memory is still 156.2 MB. Free memory was 120.5 MB in the beginning and 107.5 MB in the end (delta: 13.0 MB). Peak memory consumption was 12.6 MB. Max. memory is 8.0 GB. [2020-11-06 22:19:13,534 INFO L168 Benchmark]: TraceAbstraction took 5468.22 ms. Allocated memory was 156.2 MB in the beginning and 200.3 MB in the end (delta: 44.0 MB). Free memory was 107.1 MB in the beginning and 146.9 MB in the end (delta: -39.7 MB). Peak memory consumption was 5.3 MB. Max. memory is 8.0 GB. [2020-11-06 22:19:13,538 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.21 ms. Allocated memory is still 156.2 MB. Free memory was 130.0 MB in the beginning and 129.9 MB in the end (delta: 84.5 kB). There was no memory consumed. Max. memory is 8.0 GB. * CACSL2BoogieTranslator took 259.03 ms. Allocated memory is still 156.2 MB. Free memory was 131.0 MB in the beginning and 121.9 MB in the end (delta: 9.1 MB). Peak memory consumption was 8.4 MB. Max. memory is 8.0 GB. * Boogie Preprocessor took 62.80 ms. Allocated memory is still 156.2 MB. Free memory was 121.9 MB in the beginning and 120.5 MB in the end (delta: 1.4 MB). Peak memory consumption was 2.1 MB. Max. memory is 8.0 GB. * RCFGBuilder took 334.58 ms. Allocated memory is still 156.2 MB. Free memory was 120.5 MB in the beginning and 107.5 MB in the end (delta: 13.0 MB). Peak memory consumption was 12.6 MB. Max. memory is 8.0 GB. * TraceAbstraction took 5468.22 ms. Allocated memory was 156.2 MB in the beginning and 200.3 MB in the end (delta: 44.0 MB). Free memory was 107.1 MB in the beginning and 146.9 MB in the end (delta: -39.7 MB). Peak memory consumption was 5.3 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: [L20] int input = 5; VAL [input=5] [L21] CALL, EXPR id(input) VAL [\old(x)=5] [L10] COND FALSE !(x==0) VAL [\old(x)=5, x=5] [L11] CALL, EXPR id2(x-1) VAL [\old(x)=4] [L15] COND FALSE !(x==0) VAL [\old(x)=4, x=4] [L16] CALL, EXPR id(x-1) VAL [\old(x)=3] [L10] COND FALSE !(x==0) VAL [\old(x)=3, x=3] [L11] CALL, EXPR id2(x-1) VAL [\old(x)=2] [L15] COND FALSE !(x==0) VAL [\old(x)=2, x=2] [L16] CALL, EXPR id(x-1) VAL [\old(x)=1] [L10] COND FALSE !(x==0) VAL [\old(x)=1, x=1] [L11] CALL, EXPR id2(x-1) VAL [\old(x)=0] [L15] COND TRUE x==0 [L15] return 0; VAL [\old(x)=0, \result=0, x=0] [L11] RET, EXPR id2(x-1) VAL [\old(x)=1, id2(x-1)=0, x=1] [L11] return id2(x-1) + 1; [L16] RET, EXPR id(x-1) VAL [\old(x)=2, id(x-1)=1, x=2] [L16] return id(x-1) + 1; [L11] RET, EXPR id2(x-1) VAL [\old(x)=3, id2(x-1)=2, x=3] [L11] return id2(x-1) + 1; [L16] RET, EXPR id(x-1) VAL [\old(x)=4, id(x-1)=3, x=4] [L16] return id(x-1) + 1; [L11] RET, EXPR id2(x-1) VAL [\old(x)=5, id2(x-1)=4, x=5] [L11] return id2(x-1) + 1; [L21] RET, EXPR id(input) VAL [id(input)=5, input=5] [L21] int result = id(input); [L22] COND TRUE result == 5 VAL [input=5, result=5] [L23] CALL reach_error() [L4] __assert_fail("0", "id2_i5_o5-1.c", 4, "reach_error") - StatisticsResult: Ultimate Automizer benchmark data CFG has 6 procedures, 31 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 5.2s, OverallIterations: 6, TraceHistogramMax: 3, AutomataDifference: 2.3s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 96 SDtfs, 171 SDslu, 229 SDs, 0 SdLazy, 555 SolverSat, 92 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.7s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 196 GetRequests, 124 SyntacticMatches, 0 SemanticMatches, 72 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 135 ImplicationChecksByTransitivity, 1.9s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=38occurred 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: 0.0s AutomataMinimizationTime, 5 MinimizatonAttempts, 26 StatesRemovedByMinimization, 4 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.2s SatisfiabilityAnalysisTime, 1.3s InterpolantComputationTime, 279 NumberOfCodeBlocks, 279 NumberOfCodeBlocksAsserted, 10 NumberOfCheckSat, 226 ConstructedInterpolants, 0 QuantifiedInterpolants, 18792 SizeOfPredicates, 15 NumberOfNonLiveVariables, 420 ConjunctsInSsa, 30 ConjunctsInUnsatCore, 8 InterpolantComputations, 2 PerfectInterpolantSequences, 34/68 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...