/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data --core.log.level.for.class de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN -tc ../../../trunk/examples/toolchains/AutomizerC.xml -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/nla-digbench-scaling/hard-u_unwindbound1.c -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-c225d54 [2021-05-02 15:30:14,892 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-05-02 15:30:14,894 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-05-02 15:30:14,926 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2021-05-02 15:30:14,946 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-05-02 15:30:14,947 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-05-02 15:30:14,948 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-05-02 15:30:14,949 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-05-02 15:30:14,951 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-05-02 15:30:14,952 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-05-02 15:30:14,953 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-05-02 15:30:14,957 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-05-02 15:30:14,958 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-05-02 15:30:14,959 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-05-02 15:30:14,960 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-05-02 15:30:14,962 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-05-02 15:30:14,967 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2021-05-02 15:30:14,973 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-05-02 15:30:14,973 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-05-02 15:30:14,974 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-05-02 15:30:14,977 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 [2021-05-02 15:30:15,005 INFO L113 SettingsManager]: Loading preferences was successful [2021-05-02 15:30:15,005 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-05-02 15:30:15,007 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-05-02 15:30:15,007 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-05-02 15:30:15,007 INFO L138 SettingsManager]: * Use SBE=true [2021-05-02 15:30:15,008 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-05-02 15:30:15,008 INFO L138 SettingsManager]: * sizeof long=4 [2021-05-02 15:30:15,008 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-05-02 15:30:15,008 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-05-02 15:30:15,008 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-05-02 15:30:15,009 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-05-02 15:30:15,009 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-05-02 15:30:15,009 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-05-02 15:30:15,009 INFO L138 SettingsManager]: * sizeof long double=12 [2021-05-02 15:30:15,009 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-05-02 15:30:15,009 INFO L138 SettingsManager]: * Use constant arrays=true [2021-05-02 15:30:15,009 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-05-02 15:30:15,010 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-05-02 15:30:15,010 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-05-02 15:30:15,010 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-05-02 15:30:15,010 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-02 15:30:15,010 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-05-02 15:30:15,010 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-05-02 15:30:15,010 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-05-02 15:30:15,010 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-05-02 15:30:15,011 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-05-02 15:30:15,011 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-05-02 15:30:15,011 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-05-02 15:30:15,011 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2021-05-02 15:30:15,263 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-05-02 15:30:15,276 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-05-02 15:30:15,278 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-05-02 15:30:15,279 INFO L271 PluginConnector]: Initializing CDTParser... [2021-05-02 15:30:15,279 INFO L275 PluginConnector]: CDTParser initialized [2021-05-02 15:30:15,280 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/nla-digbench-scaling/hard-u_unwindbound1.c [2021-05-02 15:30:15,333 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/e4642ca6d/4b376027a73a4aeebe5fef1d33ea40b2/FLAGd7c7db2f2 [2021-05-02 15:30:15,685 INFO L306 CDTParser]: Found 1 translation units. [2021-05-02 15:30:15,686 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/nla-digbench-scaling/hard-u_unwindbound1.c [2021-05-02 15:30:15,691 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/e4642ca6d/4b376027a73a4aeebe5fef1d33ea40b2/FLAGd7c7db2f2 [2021-05-02 15:30:15,707 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/e4642ca6d/4b376027a73a4aeebe5fef1d33ea40b2 [2021-05-02 15:30:15,709 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-05-02 15:30:15,711 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2021-05-02 15:30:15,714 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-05-02 15:30:15,714 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-05-02 15:30:15,717 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-05-02 15:30:15,718 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 03:30:15" (1/1) ... [2021-05-02 15:30:15,718 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@273c8692 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 03:30:15, skipping insertion in model container [2021-05-02 15:30:15,718 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 03:30:15" (1/1) ... [2021-05-02 15:30:15,723 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-05-02 15:30:15,734 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-05-02 15:30:15,848 WARN L224 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/nla-digbench-scaling/hard-u_unwindbound1.c[545,558] [2021-05-02 15:30:15,864 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 15:30:15,872 INFO L203 MainTranslator]: Completed pre-run [2021-05-02 15:30:15,892 WARN L224 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/nla-digbench-scaling/hard-u_unwindbound1.c[545,558] [2021-05-02 15:30:15,918 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 15:30:15,928 INFO L208 MainTranslator]: Completed translation [2021-05-02 15:30:15,928 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 03:30:15 WrapperNode [2021-05-02 15:30:15,929 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-05-02 15:30:15,930 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-05-02 15:30:15,930 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-05-02 15:30:15,931 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-05-02 15:30:15,938 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 03:30:15" (1/1) ... [2021-05-02 15:30:15,939 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 03:30:15" (1/1) ... [2021-05-02 15:30:15,949 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 03:30:15" (1/1) ... [2021-05-02 15:30:15,950 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 03:30:15" (1/1) ... [2021-05-02 15:30:15,962 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 03:30:15" (1/1) ... [2021-05-02 15:30:15,965 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 03:30:15" (1/1) ... [2021-05-02 15:30:15,969 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 03:30:15" (1/1) ... [2021-05-02 15:30:15,970 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-05-02 15:30:15,971 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-05-02 15:30:15,971 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-05-02 15:30:15,971 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-05-02 15:30:15,971 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 03:30:15" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-02 15:30:16,024 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-05-02 15:30:16,024 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-05-02 15:30:16,024 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2021-05-02 15:30:16,025 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2021-05-02 15:30:16,025 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-05-02 15:30:16,025 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-05-02 15:30:16,025 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2021-05-02 15:30:16,025 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2021-05-02 15:30:16,026 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2021-05-02 15:30:16,026 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-05-02 15:30:16,026 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_unsigned_int [2021-05-02 15:30:16,026 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2021-05-02 15:30:16,027 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-05-02 15:30:16,027 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-05-02 15:30:16,027 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-05-02 15:30:16,027 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-05-02 15:30:16,027 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-05-02 15:30:16,027 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-05-02 15:30:16,027 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-05-02 15:30:16,027 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-05-02 15:30:16,200 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-05-02 15:30:16,200 INFO L299 CfgBuilder]: Removed 2 assume(true) statements. [2021-05-02 15:30:16,201 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 03:30:16 BoogieIcfgContainer [2021-05-02 15:30:16,201 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-05-02 15:30:16,202 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-05-02 15:30:16,202 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-05-02 15:30:16,204 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-05-02 15:30:16,204 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.05 03:30:15" (1/3) ... [2021-05-02 15:30:16,204 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1b6eee9b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 03:30:16, skipping insertion in model container [2021-05-02 15:30:16,204 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 03:30:15" (2/3) ... [2021-05-02 15:30:16,205 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1b6eee9b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 03:30:16, skipping insertion in model container [2021-05-02 15:30:16,205 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 03:30:16" (3/3) ... [2021-05-02 15:30:16,205 INFO L111 eAbstractionObserver]: Analyzing ICFG hard-u_unwindbound1.c [2021-05-02 15:30:16,209 INFO L149 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-05-02 15:30:16,211 INFO L161 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-05-02 15:30:16,226 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-05-02 15:30:16,241 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-05-02 15:30:16,244 INFO L377 AbstractCegarLoop]: Hoare is true [2021-05-02 15:30:16,244 INFO L378 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-05-02 15:30:16,256 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-05-02 15:30:16,256 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-05-02 15:30:16,256 INFO L381 AbstractCegarLoop]: Difference is false [2021-05-02 15:30:16,256 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-05-02 15:30:16,257 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-05-02 15:30:16,283 INFO L276 IsEmpty]: Start isEmpty. Operand has 37 states, 21 states have (on average 1.4761904761904763) internal successors, (31), 22 states have internal predecessors, (31), 10 states have call successors, (10), 4 states have call predecessors, (10), 4 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2021-05-02 15:30:16,286 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2021-05-02 15:30:16,286 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 15:30:16,287 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 15:30:16,287 INFO L428 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 15:30:16,291 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 15:30:16,291 INFO L82 PathProgramCache]: Analyzing trace with hash 1191571617, now seen corresponding path program 1 times [2021-05-02 15:30:16,301 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 15:30:16,301 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1760567021] [2021-05-02 15:30:16,302 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 15:30:16,408 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 15:30:16,487 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 15:30:16,491 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 15:30:16,498 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-02 15:30:16,499 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 15:30:16,501 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 15:30:16,502 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 15:30:16,502 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1760567021] [2021-05-02 15:30:16,502 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1760567021] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 15:30:16,503 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 15:30:16,503 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-05-02 15:30:16,503 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [984496714] [2021-05-02 15:30:16,506 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-05-02 15:30:16,506 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 15:30:16,513 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-05-02 15:30:16,514 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-02 15:30:16,515 INFO L87 Difference]: Start difference. First operand has 37 states, 21 states have (on average 1.4761904761904763) internal successors, (31), 22 states have internal predecessors, (31), 10 states have call successors, (10), 4 states have call predecessors, (10), 4 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) Second operand has 3 states, 3 states have (on average 4.0) internal successors, (12), 2 states have internal predecessors, (12), 2 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2021-05-02 15:30:16,596 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 15:30:16,597 INFO L93 Difference]: Finished difference Result 66 states and 101 transitions. [2021-05-02 15:30:16,597 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-05-02 15:30:16,598 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 4.0) internal successors, (12), 2 states have internal predecessors, (12), 2 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) Word has length 18 [2021-05-02 15:30:16,598 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 15:30:16,603 INFO L225 Difference]: With dead ends: 66 [2021-05-02 15:30:16,603 INFO L226 Difference]: Without dead ends: 33 [2021-05-02 15:30:16,605 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 30.0ms TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-02 15:30:16,615 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2021-05-02 15:30:16,627 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 32. [2021-05-02 15:30:16,628 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 32 states, 18 states have (on average 1.3333333333333333) internal successors, (24), 19 states have internal predecessors, (24), 10 states have call successors, (10), 4 states have call predecessors, (10), 3 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-02 15:30:16,629 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 42 transitions. [2021-05-02 15:30:16,630 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 42 transitions. Word has length 18 [2021-05-02 15:30:16,630 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 15:30:16,630 INFO L480 AbstractCegarLoop]: Abstraction has 32 states and 42 transitions. [2021-05-02 15:30:16,630 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 3 states, 3 states have (on average 4.0) internal successors, (12), 2 states have internal predecessors, (12), 2 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2021-05-02 15:30:16,630 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 42 transitions. [2021-05-02 15:30:16,631 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2021-05-02 15:30:16,631 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 15:30:16,631 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 15:30:16,631 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-05-02 15:30:16,631 INFO L428 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 15:30:16,632 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 15:30:16,632 INFO L82 PathProgramCache]: Analyzing trace with hash 336486197, now seen corresponding path program 1 times [2021-05-02 15:30:16,633 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 15:30:16,633 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1216839557] [2021-05-02 15:30:16,633 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 15:30:16,655 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 15:30:16,730 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 15:30:16,739 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 15:30:16,756 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-02 15:30:16,757 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 15:30:16,764 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 15:30:16,764 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 15:30:16,765 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1216839557] [2021-05-02 15:30:16,765 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1216839557] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 15:30:16,765 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 15:30:16,766 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-05-02 15:30:16,766 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [800547418] [2021-05-02 15:30:16,766 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-02 15:30:16,767 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 15:30:16,767 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-02 15:30:16,767 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-05-02 15:30:16,767 INFO L87 Difference]: Start difference. First operand 32 states and 42 transitions. Second operand has 6 states, 6 states have (on average 2.0) internal successors, (12), 4 states have internal predecessors, (12), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2021-05-02 15:30:17,020 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 15:30:17,020 INFO L93 Difference]: Finished difference Result 47 states and 62 transitions. [2021-05-02 15:30:17,021 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-02 15:30:17,021 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 2.0) internal successors, (12), 4 states have internal predecessors, (12), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 18 [2021-05-02 15:30:17,021 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 15:30:17,022 INFO L225 Difference]: With dead ends: 47 [2021-05-02 15:30:17,022 INFO L226 Difference]: Without dead ends: 45 [2021-05-02 15:30:17,023 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 123.0ms TimeCoverageRelationStatistics Valid=28, Invalid=62, Unknown=0, NotChecked=0, Total=90 [2021-05-02 15:30:17,023 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2021-05-02 15:30:17,029 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 36. [2021-05-02 15:30:17,029 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 36 states, 21 states have (on average 1.2857142857142858) internal successors, (27), 22 states have internal predecessors, (27), 10 states have call successors, (10), 5 states have call predecessors, (10), 4 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-02 15:30:17,030 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 45 transitions. [2021-05-02 15:30:17,030 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 45 transitions. Word has length 18 [2021-05-02 15:30:17,030 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 15:30:17,030 INFO L480 AbstractCegarLoop]: Abstraction has 36 states and 45 transitions. [2021-05-02 15:30:17,030 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 2.0) internal successors, (12), 4 states have internal predecessors, (12), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2021-05-02 15:30:17,031 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 45 transitions. [2021-05-02 15:30:17,031 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-02 15:30:17,031 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 15:30:17,031 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 15:30:17,031 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-05-02 15:30:17,031 INFO L428 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 15:30:17,032 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 15:30:17,032 INFO L82 PathProgramCache]: Analyzing trace with hash -1819267188, now seen corresponding path program 1 times [2021-05-02 15:30:17,032 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 15:30:17,032 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1795049127] [2021-05-02 15:30:17,032 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 15:30:17,041 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 15:30:17,042 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [674879375] [2021-05-02 15:30:17,042 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 [2021-05-02 15:30:17,088 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 15:30:17,090 INFO L263 TraceCheckSpWp]: Trace formula consists of 118 conjuncts, 5 conjunts are in the unsatisfiable core [2021-05-02 15:30:17,093 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 15:30:17,125 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:17,130 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:17,131 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:17,155 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:17,157 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:17,172 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 15:30:17,173 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 15:30:17,173 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1795049127] [2021-05-02 15:30:17,173 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 15:30:17,173 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [674879375] [2021-05-02 15:30:17,173 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [674879375] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 15:30:17,173 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 15:30:17,173 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-05-02 15:30:17,173 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [604724663] [2021-05-02 15:30:17,174 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-05-02 15:30:17,174 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 15:30:17,174 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-05-02 15:30:17,174 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-02 15:30:17,174 INFO L87 Difference]: Start difference. First operand 36 states and 45 transitions. Second operand has 4 states, 4 states have (on average 3.5) internal successors, (14), 3 states have internal predecessors, (14), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 15:30:17,184 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 15:30:17,184 INFO L93 Difference]: Finished difference Result 52 states and 67 transitions. [2021-05-02 15:30:17,185 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-05-02 15:30:17,185 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 3.5) internal successors, (14), 3 states have internal predecessors, (14), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 20 [2021-05-02 15:30:17,185 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 15:30:17,186 INFO L225 Difference]: With dead ends: 52 [2021-05-02 15:30:17,186 INFO L226 Difference]: Without dead ends: 38 [2021-05-02 15:30:17,186 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 17 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 4.7ms TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-02 15:30:17,186 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2021-05-02 15:30:17,190 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 38. [2021-05-02 15:30:17,190 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 38 states, 23 states have (on average 1.2608695652173914) internal successors, (29), 24 states have internal predecessors, (29), 10 states have call successors, (10), 5 states have call predecessors, (10), 4 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-02 15:30:17,191 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 47 transitions. [2021-05-02 15:30:17,191 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 47 transitions. Word has length 20 [2021-05-02 15:30:17,191 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 15:30:17,191 INFO L480 AbstractCegarLoop]: Abstraction has 38 states and 47 transitions. [2021-05-02 15:30:17,191 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 4 states, 4 states have (on average 3.5) internal successors, (14), 3 states have internal predecessors, (14), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 15:30:17,191 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 47 transitions. [2021-05-02 15:30:17,192 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2021-05-02 15:30:17,192 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 15:30:17,192 INFO L523 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 15:30:17,405 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2 [2021-05-02 15:30:17,405 INFO L428 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 15:30:17,405 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 15:30:17,406 INFO L82 PathProgramCache]: Analyzing trace with hash -784889968, now seen corresponding path program 1 times [2021-05-02 15:30:17,406 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 15:30:17,406 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1179424570] [2021-05-02 15:30:17,406 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 15:30:17,432 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 15:30:17,482 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 15:30:17,485 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 15:30:17,508 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-02 15:30:17,509 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 15:30:17,514 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 14 [2021-05-02 15:30:17,515 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 15:30:17,523 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 15:30:17,523 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 15:30:17,523 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1179424570] [2021-05-02 15:30:17,523 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1179424570] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 15:30:17,523 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 15:30:17,523 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-05-02 15:30:17,523 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [561497527] [2021-05-02 15:30:17,524 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-02 15:30:17,524 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 15:30:17,524 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-02 15:30:17,524 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-05-02 15:30:17,524 INFO L87 Difference]: Start difference. First operand 38 states and 47 transitions. Second operand has 6 states, 6 states have (on average 2.5) internal successors, (15), 4 states have internal predecessors, (15), 2 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 15:30:17,679 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 15:30:17,679 INFO L93 Difference]: Finished difference Result 52 states and 66 transitions. [2021-05-02 15:30:17,679 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-02 15:30:17,680 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 2.5) internal successors, (15), 4 states have internal predecessors, (15), 2 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 23 [2021-05-02 15:30:17,680 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 15:30:17,680 INFO L225 Difference]: With dead ends: 52 [2021-05-02 15:30:17,680 INFO L226 Difference]: Without dead ends: 50 [2021-05-02 15:30:17,681 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 87.8ms TimeCoverageRelationStatistics Valid=28, Invalid=62, Unknown=0, NotChecked=0, Total=90 [2021-05-02 15:30:17,681 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2021-05-02 15:30:17,684 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 42. [2021-05-02 15:30:17,684 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 42 states, 26 states have (on average 1.2307692307692308) internal successors, (32), 27 states have internal predecessors, (32), 10 states have call successors, (10), 6 states have call predecessors, (10), 5 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-02 15:30:17,685 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 50 transitions. [2021-05-02 15:30:17,685 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 50 transitions. Word has length 23 [2021-05-02 15:30:17,685 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 15:30:17,685 INFO L480 AbstractCegarLoop]: Abstraction has 42 states and 50 transitions. [2021-05-02 15:30:17,685 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 2.5) internal successors, (15), 4 states have internal predecessors, (15), 2 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 15:30:17,685 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 50 transitions. [2021-05-02 15:30:17,686 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2021-05-02 15:30:17,686 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 15:30:17,686 INFO L523 BasicCegarLoop]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 15:30:17,686 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-05-02 15:30:17,686 INFO L428 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 15:30:17,686 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 15:30:17,686 INFO L82 PathProgramCache]: Analyzing trace with hash -1024624683, now seen corresponding path program 1 times [2021-05-02 15:30:17,686 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 15:30:17,687 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1267792607] [2021-05-02 15:30:17,687 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 15:30:17,693 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 15:30:17,694 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1049337058] [2021-05-02 15:30:17,694 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 [2021-05-02 15:30:17,742 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 15:30:17,743 INFO L263 TraceCheckSpWp]: Trace formula consists of 131 conjuncts, 15 conjunts are in the unsatisfiable core [2021-05-02 15:30:17,744 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 15:30:17,796 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:17,799 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:17,814 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:17,816 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:17,826 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:17,827 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:17,841 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 15:30:17,842 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 15:30:17,842 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1267792607] [2021-05-02 15:30:17,842 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 15:30:17,842 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1049337058] [2021-05-02 15:30:17,842 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1049337058] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 15:30:17,842 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 15:30:17,842 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2021-05-02 15:30:17,842 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1297192096] [2021-05-02 15:30:17,842 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-05-02 15:30:17,843 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 15:30:17,843 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-05-02 15:30:17,843 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2021-05-02 15:30:17,843 INFO L87 Difference]: Start difference. First operand 42 states and 50 transitions. Second operand has 8 states, 8 states have (on average 1.875) internal successors, (15), 6 states have internal predecessors, (15), 2 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (4), 3 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-02 15:30:17,948 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 15:30:17,949 INFO L93 Difference]: Finished difference Result 71 states and 93 transitions. [2021-05-02 15:30:17,949 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-02 15:30:17,949 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 1.875) internal successors, (15), 6 states have internal predecessors, (15), 2 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (4), 3 states have call predecessors, (4), 2 states have call successors, (4) Word has length 28 [2021-05-02 15:30:17,949 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 15:30:17,950 INFO L225 Difference]: With dead ends: 71 [2021-05-02 15:30:17,950 INFO L226 Difference]: Without dead ends: 56 [2021-05-02 15:30:17,950 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 33.1ms TimeCoverageRelationStatistics Valid=22, Invalid=68, Unknown=0, NotChecked=0, Total=90 [2021-05-02 15:30:17,951 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2021-05-02 15:30:17,956 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 56. [2021-05-02 15:30:17,956 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 56 states, 33 states have (on average 1.2424242424242424) internal successors, (41), 35 states have internal predecessors, (41), 16 states have call successors, (16), 7 states have call predecessors, (16), 6 states have return successors, (13), 13 states have call predecessors, (13), 13 states have call successors, (13) [2021-05-02 15:30:17,956 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 70 transitions. [2021-05-02 15:30:17,957 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 70 transitions. Word has length 28 [2021-05-02 15:30:17,957 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 15:30:17,957 INFO L480 AbstractCegarLoop]: Abstraction has 56 states and 70 transitions. [2021-05-02 15:30:17,957 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 8 states, 8 states have (on average 1.875) internal successors, (15), 6 states have internal predecessors, (15), 2 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (4), 3 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-02 15:30:17,957 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 70 transitions. [2021-05-02 15:30:17,958 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2021-05-02 15:30:17,958 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 15:30:17,958 INFO L523 BasicCegarLoop]: trace histogram [4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 15:30:18,172 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 15:30:18,172 INFO L428 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 15:30:18,173 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 15:30:18,173 INFO L82 PathProgramCache]: Analyzing trace with hash 1301357193, now seen corresponding path program 1 times [2021-05-02 15:30:18,173 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 15:30:18,173 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [834194377] [2021-05-02 15:30:18,173 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 15:30:18,179 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 15:30:18,179 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1245218844] [2021-05-02 15:30:18,179 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 15:30:18,232 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 15:30:18,233 INFO L263 TraceCheckSpWp]: Trace formula consists of 146 conjuncts, 18 conjunts are in the unsatisfiable core [2021-05-02 15:30:18,235 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 15:30:18,280 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:18,282 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:18,300 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:18,302 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:18,313 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:18,317 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:18,368 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:18,373 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:18,389 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-05-02 15:30:18,390 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 15:30:18,390 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [834194377] [2021-05-02 15:30:18,390 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 15:30:18,390 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1245218844] [2021-05-02 15:30:18,390 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1245218844] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 15:30:18,390 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 15:30:18,390 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2021-05-02 15:30:18,390 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1946412375] [2021-05-02 15:30:18,390 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-02 15:30:18,391 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 15:30:18,391 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-02 15:30:18,391 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=56, Unknown=0, NotChecked=0, Total=72 [2021-05-02 15:30:18,391 INFO L87 Difference]: Start difference. First operand 56 states and 70 transitions. Second operand has 9 states, 9 states have (on average 2.0) internal successors, (18), 7 states have internal predecessors, (18), 3 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (5), 3 states have call predecessors, (5), 2 states have call successors, (5) [2021-05-02 15:30:18,500 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 15:30:18,500 INFO L93 Difference]: Finished difference Result 70 states and 81 transitions. [2021-05-02 15:30:18,500 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-02 15:30:18,501 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 2.0) internal successors, (18), 7 states have internal predecessors, (18), 3 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (5), 3 states have call predecessors, (5), 2 states have call successors, (5) Word has length 36 [2021-05-02 15:30:18,502 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 15:30:18,503 INFO L225 Difference]: With dead ends: 70 [2021-05-02 15:30:18,503 INFO L226 Difference]: Without dead ends: 58 [2021-05-02 15:30:18,504 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 28 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 64.6ms TimeCoverageRelationStatistics Valid=34, Invalid=122, Unknown=0, NotChecked=0, Total=156 [2021-05-02 15:30:18,504 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2021-05-02 15:30:18,523 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 58. [2021-05-02 15:30:18,523 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 58 states, 36 states have (on average 1.1666666666666667) internal successors, (42), 37 states have internal predecessors, (42), 13 states have call successors, (13), 9 states have call predecessors, (13), 8 states have return successors, (11), 11 states have call predecessors, (11), 11 states have call successors, (11) [2021-05-02 15:30:18,524 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 66 transitions. [2021-05-02 15:30:18,525 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 66 transitions. Word has length 36 [2021-05-02 15:30:18,525 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 15:30:18,525 INFO L480 AbstractCegarLoop]: Abstraction has 58 states and 66 transitions. [2021-05-02 15:30:18,525 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 9 states, 9 states have (on average 2.0) internal successors, (18), 7 states have internal predecessors, (18), 3 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (5), 3 states have call predecessors, (5), 2 states have call successors, (5) [2021-05-02 15:30:18,525 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 66 transitions. [2021-05-02 15:30:18,527 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2021-05-02 15:30:18,527 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 15:30:18,527 INFO L523 BasicCegarLoop]: trace histogram [4, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 15:30:18,733 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 15:30:18,733 INFO L428 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 15:30:18,733 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 15:30:18,733 INFO L82 PathProgramCache]: Analyzing trace with hash -1189074514, now seen corresponding path program 1 times [2021-05-02 15:30:18,733 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 15:30:18,734 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [452996427] [2021-05-02 15:30:18,734 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 15:30:18,745 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 15:30:18,745 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1647136157] [2021-05-02 15:30:18,745 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 15:30:18,810 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 15:30:18,811 INFO L263 TraceCheckSpWp]: Trace formula consists of 155 conjuncts, 18 conjunts are in the unsatisfiable core [2021-05-02 15:30:18,812 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 15:30:18,848 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:18,850 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:18,862 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:18,864 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:18,875 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:18,876 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:18,901 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:18,905 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:18,947 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:18,951 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:18,981 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 6 proven. 2 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-05-02 15:30:18,981 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 15:30:18,981 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [452996427] [2021-05-02 15:30:18,982 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 15:30:18,982 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1647136157] [2021-05-02 15:30:18,982 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1647136157] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 15:30:18,982 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 15:30:18,983 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2021-05-02 15:30:18,983 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [774641427] [2021-05-02 15:30:18,983 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-02 15:30:18,983 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 15:30:18,983 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-02 15:30:18,983 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=57, Unknown=0, NotChecked=0, Total=72 [2021-05-02 15:30:18,984 INFO L87 Difference]: Start difference. First operand 58 states and 66 transitions. Second operand has 9 states, 9 states have (on average 2.2222222222222223) internal successors, (20), 7 states have internal predecessors, (20), 3 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (5), 3 states have call predecessors, (5), 2 states have call successors, (5) [2021-05-02 15:30:19,174 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 15:30:19,174 INFO L93 Difference]: Finished difference Result 79 states and 97 transitions. [2021-05-02 15:30:19,174 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-02 15:30:19,177 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 2.2222222222222223) internal successors, (20), 7 states have internal predecessors, (20), 3 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (5), 3 states have call predecessors, (5), 2 states have call successors, (5) Word has length 38 [2021-05-02 15:30:19,177 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 15:30:19,178 INFO L225 Difference]: With dead ends: 79 [2021-05-02 15:30:19,178 INFO L226 Difference]: Without dead ends: 77 [2021-05-02 15:30:19,178 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 30 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 92.7ms TimeCoverageRelationStatistics Valid=38, Invalid=144, Unknown=0, NotChecked=0, Total=182 [2021-05-02 15:30:19,178 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 77 states. [2021-05-02 15:30:19,183 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 77 to 69. [2021-05-02 15:30:19,184 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 69 states, 43 states have (on average 1.2093023255813953) internal successors, (52), 45 states have internal predecessors, (52), 16 states have call successors, (16), 10 states have call predecessors, (16), 9 states have return successors, (14), 13 states have call predecessors, (14), 14 states have call successors, (14) [2021-05-02 15:30:19,184 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 82 transitions. [2021-05-02 15:30:19,184 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 82 transitions. Word has length 38 [2021-05-02 15:30:19,184 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 15:30:19,185 INFO L480 AbstractCegarLoop]: Abstraction has 69 states and 82 transitions. [2021-05-02 15:30:19,185 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 9 states, 9 states have (on average 2.2222222222222223) internal successors, (20), 7 states have internal predecessors, (20), 3 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (5), 3 states have call predecessors, (5), 2 states have call successors, (5) [2021-05-02 15:30:19,185 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 82 transitions. [2021-05-02 15:30:19,185 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2021-05-02 15:30:19,185 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 15:30:19,186 INFO L523 BasicCegarLoop]: trace histogram [5, 4, 4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 15:30:19,396 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 15:30:19,397 INFO L428 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 15:30:19,397 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 15:30:19,397 INFO L82 PathProgramCache]: Analyzing trace with hash 817878903, now seen corresponding path program 1 times [2021-05-02 15:30:19,397 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 15:30:19,398 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1264202659] [2021-05-02 15:30:19,398 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 15:30:19,403 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 15:30:19,403 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1877969880] [2021-05-02 15:30:19,403 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 15:30:19,464 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-05-02 15:30:19,464 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-05-02 15:30:19,487 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-05-02 15:30:19,487 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-05-02 15:30:19,542 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2021-05-02 15:30:19,542 INFO L624 BasicCegarLoop]: Counterexample might be feasible [2021-05-02 15:30:19,743 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,6 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 15:30:19,767 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 02.05 03:30:19 BoogieIcfgContainer [2021-05-02 15:30:19,767 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2021-05-02 15:30:19,768 INFO L168 Benchmark]: Toolchain (without parser) took 4057.02 ms. Allocated memory was 204.5 MB in the beginning and 254.8 MB in the end (delta: 50.3 MB). Free memory was 168.4 MB in the beginning and 175.4 MB in the end (delta: -7.0 MB). Peak memory consumption was 45.4 MB. Max. memory is 8.0 GB. [2021-05-02 15:30:19,768 INFO L168 Benchmark]: CDTParser took 0.11 ms. Allocated memory is still 204.5 MB. Free memory is still 184.7 MB. There was no memory consumed. Max. memory is 8.0 GB. [2021-05-02 15:30:19,768 INFO L168 Benchmark]: CACSL2BoogieTranslator took 214.53 ms. Allocated memory is still 204.5 MB. Free memory was 168.2 MB in the beginning and 185.9 MB in the end (delta: -17.7 MB). Peak memory consumption was 11.2 MB. Max. memory is 8.0 GB. [2021-05-02 15:30:19,768 INFO L168 Benchmark]: Boogie Preprocessor took 39.91 ms. Allocated memory is still 204.5 MB. Free memory was 185.9 MB in the beginning and 184.4 MB in the end (delta: 1.6 MB). Peak memory consumption was 1.0 MB. Max. memory is 8.0 GB. [2021-05-02 15:30:19,768 INFO L168 Benchmark]: RCFGBuilder took 230.14 ms. Allocated memory is still 204.5 MB. Free memory was 184.4 MB in the beginning and 167.6 MB in the end (delta: 16.8 MB). Peak memory consumption was 16.8 MB. Max. memory is 8.0 GB. [2021-05-02 15:30:19,768 INFO L168 Benchmark]: TraceAbstraction took 3565.65 ms. Allocated memory was 204.5 MB in the beginning and 254.8 MB in the end (delta: 50.3 MB). Free memory was 167.1 MB in the beginning and 175.4 MB in the end (delta: -8.3 MB). Peak memory consumption was 43.6 MB. Max. memory is 8.0 GB. [2021-05-02 15:30:19,768 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.11 ms. Allocated memory is still 204.5 MB. Free memory is still 184.7 MB. There was no memory consumed. Max. memory is 8.0 GB. * CACSL2BoogieTranslator took 214.53 ms. Allocated memory is still 204.5 MB. Free memory was 168.2 MB in the beginning and 185.9 MB in the end (delta: -17.7 MB). Peak memory consumption was 11.2 MB. Max. memory is 8.0 GB. * Boogie Preprocessor took 39.91 ms. Allocated memory is still 204.5 MB. Free memory was 185.9 MB in the beginning and 184.4 MB in the end (delta: 1.6 MB). Peak memory consumption was 1.0 MB. Max. memory is 8.0 GB. * RCFGBuilder took 230.14 ms. Allocated memory is still 204.5 MB. Free memory was 184.4 MB in the beginning and 167.6 MB in the end (delta: 16.8 MB). Peak memory consumption was 16.8 MB. Max. memory is 8.0 GB. * TraceAbstraction took 3565.65 ms. Allocated memory was 204.5 MB in the beginning and 254.8 MB in the end (delta: 50.3 MB). Free memory was 167.1 MB in the beginning and 175.4 MB in the end (delta: -8.3 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: 17]: a call to reach_error is reachable a call to reach_error is reachable We found a FailurePath: [L22] int counter = 0; VAL [\old(counter)=16, counter=0] [L24] unsigned int A, B; [L25] unsigned int r, d, p, q; [L26] A = __VERIFIER_nondet_unsigned_int() [L27] B = __VERIFIER_nondet_unsigned_int() [L28] CALL assume_abort_if_not(B >= 1) VAL [\old(cond)=1, \old(counter)=0, counter=0] [L12] COND FALSE !(!cond) VAL [\old(cond)=1, \old(counter)=0, cond=1, counter=0] [L28] RET assume_abort_if_not(B >= 1) VAL [\old(counter)=0, B=-4294967295, counter=0] [L30] r = A [L31] d = B [L32] p = 1 [L33] q = 0 VAL [\old(counter)=0, A=4294967297, B=-4294967295, counter=0, d=-4294967295, p=1, q=0, r=4294967297] [L35] EXPR counter++ VAL [\old(counter)=0, A=4294967297, B=-4294967295, counter=1, counter++=0, d=-4294967295, p=1, q=0, r=4294967297] [L35] COND TRUE counter++<1 [L36] CALL __VERIFIER_assert(q == 0) VAL [\old(cond)=1, \old(counter)=0, counter=1] [L15] COND FALSE !(!(cond)) VAL [\old(cond)=1, \old(counter)=0, cond=1, counter=1] [L36] RET __VERIFIER_assert(q == 0) VAL [\old(counter)=0, A=4294967297, B=-4294967295, counter=1, d=-4294967295, p=1, q=0, r=4294967297] [L37] CALL __VERIFIER_assert(r == A) VAL [\old(cond)=1, \old(counter)=0, counter=1] [L15] COND FALSE !(!(cond)) VAL [\old(cond)=1, \old(counter)=0, cond=1, counter=1] [L37] RET __VERIFIER_assert(r == A) VAL [\old(counter)=0, A=4294967297, B=-4294967295, counter=1, d=-4294967295, p=1, q=0, r=4294967297] [L38] CALL __VERIFIER_assert(d == B * p) VAL [\old(cond)=1, \old(counter)=0, counter=1] [L15] COND FALSE !(!(cond)) VAL [\old(cond)=1, \old(counter)=0, cond=1, counter=1] [L38] RET __VERIFIER_assert(d == B * p) VAL [\old(counter)=0, A=4294967297, B=-4294967295, counter=1, d=-4294967295, p=1, q=0, r=4294967297] [L39] COND FALSE !(!(r >= d)) [L41] d = 2 * d [L42] p = 2 * p VAL [\old(counter)=0, A=4294967297, B=-4294967295, counter=1, d=-8589934590, p=2, q=0, r=4294967297] [L35] EXPR counter++ VAL [\old(counter)=0, A=4294967297, B=-4294967295, counter=2, counter++=1, d=-8589934590, p=2, q=0, r=4294967297] [L35] COND FALSE !(counter++<1) [L45] EXPR counter++ VAL [\old(counter)=0, A=4294967297, B=-4294967295, counter=3, counter++=2, d=-8589934590, p=2, q=0, r=4294967297] [L45] COND FALSE !(counter++<1) [L59] CALL __VERIFIER_assert(A == d*q + r) VAL [\old(cond)=1, \old(counter)=0, counter=3] [L15] COND FALSE !(!(cond)) VAL [\old(cond)=1, \old(counter)=0, cond=1, counter=3] [L59] RET __VERIFIER_assert(A == d*q + r) VAL [\old(counter)=0, A=4294967297, B=-4294967295, counter=3, d=-8589934590, p=2, q=0, r=4294967297] [L60] CALL __VERIFIER_assert(B == d) VAL [\old(cond)=0, \old(counter)=0, counter=3] [L15] COND TRUE !(cond) VAL [\old(cond)=0, \old(counter)=0, cond=0, counter=3] [L17] reach_error() VAL [\old(cond)=0, \old(counter)=0, cond=0, counter=3] - StatisticsResult: Ultimate Automizer benchmark data CFG has 6 procedures, 40 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 3503.7ms, OverallIterations: 8, TraceHistogramMax: 5, EmptinessCheckTime: 10.5ms, AutomataDifference: 940.1ms, DeadEndRemovalTime: 0.0ms, HoareAnnotationTime: 0.0ms, InitialAbstractionConstructionTime: 23.9ms, PartialOrderReductionTime: 0.0ms, HoareTripleCheckerStatistics: 286 SDtfs, 160 SDslu, 862 SDs, 0 SdLazy, 487 SolverSat, 89 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 464.9ms Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 164 GetRequests, 114 SyntacticMatches, 0 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 31 ImplicationChecksByTransitivity, 436.3ms Time, 0.0ms BasicInterpolantAutomatonTime, BiggestAbstraction: size=69occurred in iteration=7, InterpolantAutomatonStates: 50, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0ms DumpTime, AutomataMinimizationStatistics: 64.3ms AutomataMinimizationTime, 7 MinimizatonAttempts, 26 StatesRemovedByMinimization, 4 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 68.5ms SsaConstructionTime, 208.6ms SatisfiabilityAnalysisTime, 801.7ms InterpolantComputationTime, 224 NumberOfCodeBlocks, 224 NumberOfCodeBlocksAsserted, 8 NumberOfCheckSat, 174 ConstructedInterpolants, 0 QuantifiedInterpolants, 682 SizeOfPredicates, 9 NumberOfNonLiveVariables, 550 ConjunctsInSsa, 56 ConjunctsInUnsatCore, 7 InterpolantComputations, 6 PerfectInterpolantSequences, 46/48 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...