/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/ps5-ll_unwindbound50.c -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-c225d54 [2021-05-02 17:03:49,643 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-05-02 17:03:49,645 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-05-02 17:03:49,670 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2021-05-02 17:03:49,680 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-05-02 17:03:49,681 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-05-02 17:03:49,681 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-05-02 17:03:49,682 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-05-02 17:03:49,683 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-05-02 17:03:49,684 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-05-02 17:03:49,685 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-05-02 17:03:49,687 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-05-02 17:03:49,688 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-05-02 17:03:49,689 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-05-02 17:03:49,690 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-05-02 17:03:49,691 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-05-02 17:03:49,693 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2021-05-02 17:03:49,701 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-05-02 17:03:49,702 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-05-02 17:03:49,703 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-05-02 17:03:49,703 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 17:03:49,746 INFO L113 SettingsManager]: Loading preferences was successful [2021-05-02 17:03:49,747 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-05-02 17:03:49,748 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-05-02 17:03:49,748 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-05-02 17:03:49,748 INFO L138 SettingsManager]: * Use SBE=true [2021-05-02 17:03:49,748 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-05-02 17:03:49,749 INFO L138 SettingsManager]: * sizeof long=4 [2021-05-02 17:03:49,749 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-05-02 17:03:49,749 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-05-02 17:03:49,749 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-05-02 17:03:49,749 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-05-02 17:03:49,749 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-05-02 17:03:49,750 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-05-02 17:03:49,750 INFO L138 SettingsManager]: * sizeof long double=12 [2021-05-02 17:03:49,750 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-05-02 17:03:49,750 INFO L138 SettingsManager]: * Use constant arrays=true [2021-05-02 17:03:49,750 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-05-02 17:03:49,750 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-05-02 17:03:49,751 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-05-02 17:03:49,751 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-05-02 17:03:49,751 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-02 17:03:49,751 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-05-02 17:03:49,751 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-05-02 17:03:49,751 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-05-02 17:03:49,752 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-05-02 17:03:49,752 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-05-02 17:03:49,752 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-05-02 17:03:49,752 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-05-02 17:03:49,752 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2021-05-02 17:03:50,045 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-05-02 17:03:50,063 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-05-02 17:03:50,065 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-05-02 17:03:50,066 INFO L271 PluginConnector]: Initializing CDTParser... [2021-05-02 17:03:50,066 INFO L275 PluginConnector]: CDTParser initialized [2021-05-02 17:03:50,067 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/nla-digbench-scaling/ps5-ll_unwindbound50.c [2021-05-02 17:03:50,135 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/a7f2bcb4b/7269aad8812f4f6c8606ca56ab6da967/FLAGe28663d15 [2021-05-02 17:03:50,541 INFO L306 CDTParser]: Found 1 translation units. [2021-05-02 17:03:50,542 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/nla-digbench-scaling/ps5-ll_unwindbound50.c [2021-05-02 17:03:50,550 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/a7f2bcb4b/7269aad8812f4f6c8606ca56ab6da967/FLAGe28663d15 [2021-05-02 17:03:50,936 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/a7f2bcb4b/7269aad8812f4f6c8606ca56ab6da967 [2021-05-02 17:03:50,944 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-05-02 17:03:50,946 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2021-05-02 17:03:50,949 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-05-02 17:03:50,949 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-05-02 17:03:50,952 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-05-02 17:03:50,953 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 05:03:50" (1/1) ... [2021-05-02 17:03:50,955 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@6cedd335 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 05:03:50, skipping insertion in model container [2021-05-02 17:03:50,955 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 05:03:50" (1/1) ... [2021-05-02 17:03:50,961 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-05-02 17:03:50,976 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-05-02 17:03:51,101 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/ps5-ll_unwindbound50.c[458,471] [2021-05-02 17:03:51,121 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 17:03:51,129 INFO L203 MainTranslator]: Completed pre-run [2021-05-02 17:03:51,161 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/ps5-ll_unwindbound50.c[458,471] [2021-05-02 17:03:51,168 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 17:03:51,205 INFO L208 MainTranslator]: Completed translation [2021-05-02 17:03:51,206 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 05:03:51 WrapperNode [2021-05-02 17:03:51,206 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-05-02 17:03:51,209 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-05-02 17:03:51,209 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-05-02 17:03:51,211 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-05-02 17:03:51,220 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 05:03:51" (1/1) ... [2021-05-02 17:03:51,221 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 05:03:51" (1/1) ... [2021-05-02 17:03:51,227 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 05:03:51" (1/1) ... [2021-05-02 17:03:51,228 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 05:03:51" (1/1) ... [2021-05-02 17:03:51,240 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 05:03:51" (1/1) ... [2021-05-02 17:03:51,244 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 05:03:51" (1/1) ... [2021-05-02 17:03:51,246 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 05:03:51" (1/1) ... [2021-05-02 17:03:51,252 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-05-02 17:03:51,254 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-05-02 17:03:51,254 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-05-02 17:03:51,254 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-05-02 17:03:51,255 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 05:03:51" (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 17:03:51,325 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-05-02 17:03:51,325 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-05-02 17:03:51,325 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2021-05-02 17:03:51,326 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2021-05-02 17:03:51,326 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-05-02 17:03:51,326 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-05-02 17:03:51,326 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2021-05-02 17:03:51,327 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2021-05-02 17:03:51,327 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2021-05-02 17:03:51,327 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-05-02 17:03:51,327 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_short [2021-05-02 17:03:51,327 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2021-05-02 17:03:51,328 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-05-02 17:03:51,328 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-05-02 17:03:51,329 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-05-02 17:03:51,329 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-05-02 17:03:51,329 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-05-02 17:03:51,329 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-05-02 17:03:51,329 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-05-02 17:03:51,329 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-05-02 17:03:51,634 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-05-02 17:03:51,634 INFO L299 CfgBuilder]: Removed 1 assume(true) statements. [2021-05-02 17:03:51,635 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 05:03:51 BoogieIcfgContainer [2021-05-02 17:03:51,635 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-05-02 17:03:51,637 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-05-02 17:03:51,637 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-05-02 17:03:51,639 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-05-02 17:03:51,639 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.05 05:03:50" (1/3) ... [2021-05-02 17:03:51,640 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@37e24245 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 05:03:51, skipping insertion in model container [2021-05-02 17:03:51,640 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 05:03:51" (2/3) ... [2021-05-02 17:03:51,640 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@37e24245 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 05:03:51, skipping insertion in model container [2021-05-02 17:03:51,641 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 05:03:51" (3/3) ... [2021-05-02 17:03:51,642 INFO L111 eAbstractionObserver]: Analyzing ICFG ps5-ll_unwindbound50.c [2021-05-02 17:03:51,646 INFO L149 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-05-02 17:03:51,650 INFO L161 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-05-02 17:03:51,664 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-05-02 17:03:51,683 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-05-02 17:03:51,683 INFO L377 AbstractCegarLoop]: Hoare is true [2021-05-02 17:03:51,683 INFO L378 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-05-02 17:03:51,683 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-05-02 17:03:51,683 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-05-02 17:03:51,684 INFO L381 AbstractCegarLoop]: Difference is false [2021-05-02 17:03:51,684 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-05-02 17:03:51,684 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-05-02 17:03:51,697 INFO L276 IsEmpty]: Start isEmpty. Operand has 29 states, 17 states have (on average 1.3529411764705883) internal successors, (23), 18 states have internal predecessors, (23), 6 states have call successors, (6), 4 states have call predecessors, (6), 4 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-05-02 17:03:51,701 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-05-02 17:03:51,701 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:03:51,702 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:03:51,702 INFO L428 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:03:51,707 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:03:51,707 INFO L82 PathProgramCache]: Analyzing trace with hash 21872251, now seen corresponding path program 1 times [2021-05-02 17:03:51,715 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:03:51,715 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [159126143] [2021-05-02 17:03:51,715 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:03:51,810 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:03:51,934 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:03:51,939 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:03:51,950 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-02 17:03:51,952 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:03:51,957 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 17:03:51,957 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:03:51,957 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [159126143] [2021-05-02 17:03:51,958 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [159126143] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 17:03:51,958 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 17:03:51,959 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-05-02 17:03:51,959 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [159772874] [2021-05-02 17:03:51,963 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-05-02 17:03:51,963 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:03:51,974 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-05-02 17:03:51,975 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-02 17:03:51,977 INFO L87 Difference]: Start difference. First operand has 29 states, 17 states have (on average 1.3529411764705883) internal successors, (23), 18 states have internal predecessors, (23), 6 states have call successors, (6), 4 states have call predecessors, (6), 4 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) Second operand has 3 states, 3 states have (on average 3.6666666666666665) internal successors, (11), 2 states have internal predecessors, (11), 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 17:03:52,080 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:03:52,081 INFO L93 Difference]: Finished difference Result 50 states and 65 transitions. [2021-05-02 17:03:52,082 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-05-02 17:03:52,083 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 3.6666666666666665) internal successors, (11), 2 states have internal predecessors, (11), 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 17 [2021-05-02 17:03:52,083 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:03:52,089 INFO L225 Difference]: With dead ends: 50 [2021-05-02 17:03:52,090 INFO L226 Difference]: Without dead ends: 25 [2021-05-02 17:03:52,093 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 63.4ms TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-02 17:03:52,107 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2021-05-02 17:03:52,135 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 24. [2021-05-02 17:03:52,137 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24 states, 14 states have (on average 1.2142857142857142) internal successors, (17), 15 states have internal predecessors, (17), 6 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-05-02 17:03:52,139 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 27 transitions. [2021-05-02 17:03:52,141 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 27 transitions. Word has length 17 [2021-05-02 17:03:52,141 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:03:52,141 INFO L480 AbstractCegarLoop]: Abstraction has 24 states and 27 transitions. [2021-05-02 17:03:52,145 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 3 states, 3 states have (on average 3.6666666666666665) internal successors, (11), 2 states have internal predecessors, (11), 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 17:03:52,145 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 27 transitions. [2021-05-02 17:03:52,147 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2021-05-02 17:03:52,147 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:03:52,147 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 17:03:52,147 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-05-02 17:03:52,148 INFO L428 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:03:52,148 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:03:52,149 INFO L82 PathProgramCache]: Analyzing trace with hash -119968982, now seen corresponding path program 1 times [2021-05-02 17:03:52,149 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:03:52,149 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1873434576] [2021-05-02 17:03:52,149 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:03:52,172 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 17:03:52,172 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1111157522] [2021-05-02 17:03:52,172 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 17:03:52,255 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:03:52,257 INFO L263 TraceCheckSpWp]: Trace formula consists of 114 conjuncts, 5 conjunts are in the unsatisfiable core [2021-05-02 17:03:52,262 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:03:52,307 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:03:52,316 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:03:52,324 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:03:52,356 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:03:52,360 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:03:52,384 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 17:03:52,385 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:03:52,385 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1873434576] [2021-05-02 17:03:52,387 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 17:03:52,390 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1111157522] [2021-05-02 17:03:52,390 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1111157522] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 17:03:52,391 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 17:03:52,391 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-05-02 17:03:52,392 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2137088045] [2021-05-02 17:03:52,393 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-05-02 17:03:52,394 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:03:52,396 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-05-02 17:03:52,396 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-02 17:03:52,396 INFO L87 Difference]: Start difference. First operand 24 states and 27 transitions. Second operand has 4 states, 4 states have (on average 3.0) internal successors, (12), 3 states have internal predecessors, (12), 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 17:03:52,423 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:03:52,423 INFO L93 Difference]: Finished difference Result 34 states and 38 transitions. [2021-05-02 17:03:52,424 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-05-02 17:03:52,424 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 3.0) internal successors, (12), 3 states have internal predecessors, (12), 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 18 [2021-05-02 17:03:52,424 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:03:52,426 INFO L225 Difference]: With dead ends: 34 [2021-05-02 17:03:52,426 INFO L226 Difference]: Without dead ends: 26 [2021-05-02 17:03:52,427 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 15 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 8.5ms TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-02 17:03:52,428 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2021-05-02 17:03:52,443 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2021-05-02 17:03:52,443 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26 states, 16 states have (on average 1.1875) internal successors, (19), 17 states have internal predecessors, (19), 6 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-05-02 17:03:52,444 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 29 transitions. [2021-05-02 17:03:52,444 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 29 transitions. Word has length 18 [2021-05-02 17:03:52,444 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:03:52,444 INFO L480 AbstractCegarLoop]: Abstraction has 26 states and 29 transitions. [2021-05-02 17:03:52,444 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 4 states, 4 states have (on average 3.0) internal successors, (12), 3 states have internal predecessors, (12), 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 17:03:52,445 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 29 transitions. [2021-05-02 17:03:52,445 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2021-05-02 17:03:52,445 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:03:52,445 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 17:03:52,646 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1 [2021-05-02 17:03:52,646 INFO L428 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:03:52,647 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:03:52,647 INFO L82 PathProgramCache]: Analyzing trace with hash -118181522, now seen corresponding path program 1 times [2021-05-02 17:03:52,647 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:03:52,647 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1935576938] [2021-05-02 17:03:52,647 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:03:52,667 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 17:03:52,668 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1130751091] [2021-05-02 17:03:52,668 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 17:03:52,726 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:03:52,727 INFO L263 TraceCheckSpWp]: Trace formula consists of 114 conjuncts, 15 conjunts are in the unsatisfiable core [2021-05-02 17:03:52,729 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:03:52,761 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:03:52,802 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 17:03:52,802 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:03:52,803 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1935576938] [2021-05-02 17:03:52,803 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 17:03:52,803 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1130751091] [2021-05-02 17:03:52,803 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1130751091] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 17:03:52,803 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 17:03:52,803 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2021-05-02 17:03:52,803 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1841023131] [2021-05-02 17:03:52,804 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-05-02 17:03:52,804 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:03:52,804 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-05-02 17:03:52,805 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-05-02 17:03:52,805 INFO L87 Difference]: Start difference. First operand 26 states and 29 transitions. Second operand has 7 states, 7 states have (on average 1.7142857142857142) internal successors, (12), 6 states have internal predecessors, (12), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2021-05-02 17:03:52,903 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:03:52,904 INFO L93 Difference]: Finished difference Result 36 states and 41 transitions. [2021-05-02 17:03:52,904 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-05-02 17:03:52,904 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 1.7142857142857142) internal successors, (12), 6 states have internal predecessors, (12), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 18 [2021-05-02 17:03:52,904 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:03:52,905 INFO L225 Difference]: With dead ends: 36 [2021-05-02 17:03:52,905 INFO L226 Difference]: Without dead ends: 32 [2021-05-02 17:03:52,906 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 12 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 40.6ms TimeCoverageRelationStatistics Valid=19, Invalid=53, Unknown=0, NotChecked=0, Total=72 [2021-05-02 17:03:52,906 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2021-05-02 17:03:52,911 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32. [2021-05-02 17:03:52,912 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 32 states, 20 states have (on average 1.15) internal successors, (23), 21 states have internal predecessors, (23), 7 states have call successors, (7), 5 states have call predecessors, (7), 4 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-05-02 17:03:52,913 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 35 transitions. [2021-05-02 17:03:52,913 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 35 transitions. Word has length 18 [2021-05-02 17:03:52,913 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:03:52,913 INFO L480 AbstractCegarLoop]: Abstraction has 32 states and 35 transitions. [2021-05-02 17:03:52,913 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 7 states, 7 states have (on average 1.7142857142857142) internal successors, (12), 6 states have internal predecessors, (12), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2021-05-02 17:03:52,913 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 35 transitions. [2021-05-02 17:03:52,914 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-05-02 17:03:52,914 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:03:52,914 INFO L523 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] [2021-05-02 17:03:53,136 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:03:53,137 INFO L428 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:03:53,137 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:03:53,138 INFO L82 PathProgramCache]: Analyzing trace with hash -1364840471, now seen corresponding path program 1 times [2021-05-02 17:03:53,138 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:03:53,138 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2117290684] [2021-05-02 17:03:53,138 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:03:53,158 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 17:03:53,159 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [713774125] [2021-05-02 17:03:53,159 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 17:03:53,213 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:03:53,215 INFO L263 TraceCheckSpWp]: Trace formula consists of 135 conjuncts, 7 conjunts are in the unsatisfiable core [2021-05-02 17:03:53,217 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:03:53,230 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:03:53,234 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:03:53,235 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:03:53,255 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:03:53,258 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:03:53,260 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:03:53,283 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:03:53,285 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:03:53,299 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 17:03:53,300 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:03:53,300 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2117290684] [2021-05-02 17:03:53,300 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 17:03:53,300 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [713774125] [2021-05-02 17:03:53,300 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [713774125] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:03:53,300 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 17:03:53,300 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5] total 5 [2021-05-02 17:03:53,301 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [336398483] [2021-05-02 17:03:53,301 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-05-02 17:03:53,301 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:03:53,302 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-05-02 17:03:53,302 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-05-02 17:03:53,302 INFO L87 Difference]: Start difference. First operand 32 states and 35 transitions. Second operand has 5 states, 5 states have (on average 3.6) internal successors, (18), 4 states have internal predecessors, (18), 4 states have call successors, (5), 4 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 17:03:53,337 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:03:53,337 INFO L93 Difference]: Finished difference Result 42 states and 46 transitions. [2021-05-02 17:03:53,337 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-02 17:03:53,338 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 3.6) internal successors, (18), 4 states have internal predecessors, (18), 4 states have call successors, (5), 4 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) Word has length 26 [2021-05-02 17:03:53,338 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:03:53,339 INFO L225 Difference]: With dead ends: 42 [2021-05-02 17:03:53,339 INFO L226 Difference]: Without dead ends: 34 [2021-05-02 17:03:53,339 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 22 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 16.3ms TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-05-02 17:03:53,340 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2021-05-02 17:03:53,362 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 34. [2021-05-02 17:03:53,362 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 34 states, 22 states have (on average 1.1363636363636365) internal successors, (25), 23 states have internal predecessors, (25), 7 states have call successors, (7), 5 states have call predecessors, (7), 4 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-05-02 17:03:53,365 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 37 transitions. [2021-05-02 17:03:53,366 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 37 transitions. Word has length 26 [2021-05-02 17:03:53,366 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:03:53,366 INFO L480 AbstractCegarLoop]: Abstraction has 34 states and 37 transitions. [2021-05-02 17:03:53,366 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 5 states, 5 states have (on average 3.6) internal successors, (18), 4 states have internal predecessors, (18), 4 states have call successors, (5), 4 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 17:03:53,366 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 37 transitions. [2021-05-02 17:03:53,367 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-05-02 17:03:53,367 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:03:53,367 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:03:53,568 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:03:53,568 INFO L428 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:03:53,569 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:03:53,569 INFO L82 PathProgramCache]: Analyzing trace with hash -1363053011, now seen corresponding path program 1 times [2021-05-02 17:03:53,569 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:03:53,569 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1240758153] [2021-05-02 17:03:53,569 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:03:53,580 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 17:03:53,581 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1331276954] [2021-05-02 17:03:53,581 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 17:03:53,671 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:03:53,672 INFO L263 TraceCheckSpWp]: Trace formula consists of 135 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-02 17:03:53,674 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:03:53,702 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:03:53,773 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 2 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 17:03:53,774 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:03:53,774 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1240758153] [2021-05-02 17:03:53,774 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 17:03:53,774 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1331276954] [2021-05-02 17:03:53,774 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1331276954] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:03:53,774 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 17:03:53,774 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2021-05-02 17:03:53,775 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [427965503] [2021-05-02 17:03:53,775 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-05-02 17:03:53,775 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:03:53,776 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-05-02 17:03:53,776 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2021-05-02 17:03:53,776 INFO L87 Difference]: Start difference. First operand 34 states and 37 transitions. Second operand has 8 states, 8 states have (on average 2.25) internal successors, (18), 7 states have internal predecessors, (18), 3 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 17:03:53,878 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:03:53,879 INFO L93 Difference]: Finished difference Result 44 states and 49 transitions. [2021-05-02 17:03:53,879 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-02 17:03:53,879 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 2.25) internal successors, (18), 7 states have internal predecessors, (18), 3 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 26 [2021-05-02 17:03:53,880 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:03:53,880 INFO L225 Difference]: With dead ends: 44 [2021-05-02 17:03:53,880 INFO L226 Difference]: Without dead ends: 42 [2021-05-02 17:03:53,881 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 19 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 51.0ms TimeCoverageRelationStatistics Valid=21, Invalid=69, Unknown=0, NotChecked=0, Total=90 [2021-05-02 17:03:53,881 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2021-05-02 17:03:53,889 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 41. [2021-05-02 17:03:53,890 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 41 states, 26 states have (on average 1.1538461538461537) internal successors, (30), 28 states have internal predecessors, (30), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (7), 6 states have call predecessors, (7), 7 states have call successors, (7) [2021-05-02 17:03:53,891 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 46 transitions. [2021-05-02 17:03:53,891 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 46 transitions. Word has length 26 [2021-05-02 17:03:53,891 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:03:53,891 INFO L480 AbstractCegarLoop]: Abstraction has 41 states and 46 transitions. [2021-05-02 17:03:53,891 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 8 states, 8 states have (on average 2.25) internal successors, (18), 7 states have internal predecessors, (18), 3 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 17:03:53,891 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 46 transitions. [2021-05-02 17:03:53,892 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2021-05-02 17:03:53,892 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:03:53,892 INFO L523 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:03:54,096 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:03:54,097 INFO L428 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:03:54,097 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:03:54,097 INFO L82 PathProgramCache]: Analyzing trace with hash -595737176, now seen corresponding path program 2 times [2021-05-02 17:03:54,097 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:03:54,097 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [772267149] [2021-05-02 17:03:54,098 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:03:54,108 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 17:03:54,108 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [597387421] [2021-05-02 17:03:54,109 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 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 17:03:54,173 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 17:03:54,173 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 17:03:54,174 INFO L263 TraceCheckSpWp]: Trace formula consists of 156 conjuncts, 9 conjunts are in the unsatisfiable core [2021-05-02 17:03:54,177 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:03:54,191 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:03:54,194 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:03:54,195 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:03:54,210 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:03:54,213 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:03:54,215 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:03:54,233 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:03:54,236 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:03:54,237 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:03:54,255 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:03:54,257 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:03:54,269 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 4 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 17:03:54,269 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:03:54,269 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [772267149] [2021-05-02 17:03:54,270 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 17:03:54,270 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [597387421] [2021-05-02 17:03:54,270 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [597387421] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:03:54,270 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 17:03:54,270 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2021-05-02 17:03:54,270 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [723127714] [2021-05-02 17:03:54,270 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-02 17:03:54,271 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:03:54,271 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-02 17:03:54,271 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-05-02 17:03:54,271 INFO L87 Difference]: Start difference. First operand 41 states and 46 transitions. Second operand has 6 states, 6 states have (on average 4.0) internal successors, (24), 5 states have internal predecessors, (24), 5 states have call successors, (6), 5 states have call predecessors, (6), 3 states have return successors, (4), 3 states have call predecessors, (4), 4 states have call successors, (4) [2021-05-02 17:03:56,365 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:03:56,365 INFO L93 Difference]: Finished difference Result 58 states and 63 transitions. [2021-05-02 17:03:56,366 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-02 17:03:56,366 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 4.0) internal successors, (24), 5 states have internal predecessors, (24), 5 states have call successors, (6), 5 states have call predecessors, (6), 3 states have return successors, (4), 3 states have call predecessors, (4), 4 states have call successors, (4) Word has length 34 [2021-05-02 17:03:56,366 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:03:56,367 INFO L225 Difference]: With dead ends: 58 [2021-05-02 17:03:56,367 INFO L226 Difference]: Without dead ends: 48 [2021-05-02 17:03:56,367 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 29 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 24.8ms TimeCoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2021-05-02 17:03:56,367 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2021-05-02 17:03:56,373 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 46. [2021-05-02 17:03:56,373 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 46 states, 30 states have (on average 1.1333333333333333) internal successors, (34), 31 states have internal predecessors, (34), 10 states have call successors, (10), 7 states have call predecessors, (10), 5 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2021-05-02 17:03:56,374 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 51 transitions. [2021-05-02 17:03:56,374 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 51 transitions. Word has length 34 [2021-05-02 17:03:56,374 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:03:56,374 INFO L480 AbstractCegarLoop]: Abstraction has 46 states and 51 transitions. [2021-05-02 17:03:56,374 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 4.0) internal successors, (24), 5 states have internal predecessors, (24), 5 states have call successors, (6), 5 states have call predecessors, (6), 3 states have return successors, (4), 3 states have call predecessors, (4), 4 states have call successors, (4) [2021-05-02 17:03:56,375 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 51 transitions. [2021-05-02 17:03:56,375 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2021-05-02 17:03:56,375 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:03:56,375 INFO L523 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:03:56,598 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2021-05-02 17:03:56,599 INFO L428 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:03:56,599 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:03:56,599 INFO L82 PathProgramCache]: Analyzing trace with hash -593949716, now seen corresponding path program 2 times [2021-05-02 17:03:56,599 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:03:56,599 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1036517217] [2021-05-02 17:03:56,599 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:03:56,606 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 17:03:56,606 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [19684944] [2021-05-02 17:03:56,606 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 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:03:56,842 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 17:03:56,842 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 17:03:56,843 INFO L263 TraceCheckSpWp]: Trace formula consists of 156 conjuncts, 28 conjunts are in the unsatisfiable core [2021-05-02 17:03:56,845 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:04:05,702 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 2 proven. 12 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 17:04:05,702 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:04:05,702 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1036517217] [2021-05-02 17:04:05,703 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 17:04:05,703 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [19684944] [2021-05-02 17:04:05,703 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [19684944] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:04:05,703 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 17:04:05,703 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2021-05-02 17:04:05,703 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [805806860] [2021-05-02 17:04:05,704 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-02 17:04:05,704 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:04:05,704 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-02 17:04:05,704 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=56, Unknown=0, NotChecked=0, Total=72 [2021-05-02 17:04:05,704 INFO L87 Difference]: Start difference. First operand 46 states and 51 transitions. Second operand has 9 states, 9 states have (on average 2.3333333333333335) internal successors, (21), 8 states have internal predecessors, (21), 4 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) [2021-05-02 17:04:07,990 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:04:07,990 INFO L93 Difference]: Finished difference Result 56 states and 63 transitions. [2021-05-02 17:04:07,990 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-02 17:04:07,991 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 2.3333333333333335) internal successors, (21), 8 states have internal predecessors, (21), 4 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) Word has length 34 [2021-05-02 17:04:07,991 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:04:07,991 INFO L225 Difference]: With dead ends: 56 [2021-05-02 17:04:07,991 INFO L226 Difference]: Without dead ends: 54 [2021-05-02 17:04:07,992 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 24 SyntacticMatches, 2 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 8773.6ms TimeCoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2021-05-02 17:04:07,992 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2021-05-02 17:04:07,998 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 53. [2021-05-02 17:04:07,999 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 53 states, 34 states have (on average 1.1470588235294117) internal successors, (39), 36 states have internal predecessors, (39), 12 states have call successors, (12), 8 states have call predecessors, (12), 6 states have return successors, (9), 8 states have call predecessors, (9), 9 states have call successors, (9) [2021-05-02 17:04:08,000 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 60 transitions. [2021-05-02 17:04:08,000 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 60 transitions. Word has length 34 [2021-05-02 17:04:08,000 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:04:08,000 INFO L480 AbstractCegarLoop]: Abstraction has 53 states and 60 transitions. [2021-05-02 17:04:08,000 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 9 states, 9 states have (on average 2.3333333333333335) internal successors, (21), 8 states have internal predecessors, (21), 4 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) [2021-05-02 17:04:08,000 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 60 transitions. [2021-05-02 17:04:08,001 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2021-05-02 17:04:08,001 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:04:08,001 INFO L523 BasicCegarLoop]: trace histogram [4, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:04:08,204 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:04:08,205 INFO L428 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:04:08,205 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:04:08,206 INFO L82 PathProgramCache]: Analyzing trace with hash -1559147673, now seen corresponding path program 1 times [2021-05-02 17:04:08,206 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:04:08,206 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [652307499] [2021-05-02 17:04:08,206 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:04:08,215 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 17:04:08,215 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1749631798] [2021-05-02 17:04:08,215 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:04:08,267 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:04:08,268 INFO L263 TraceCheckSpWp]: Trace formula consists of 154 conjuncts, 20 conjunts are in the unsatisfiable core [2021-05-02 17:04:08,270 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:04:08,331 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:04:08,333 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:04:08,373 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:04:08,375 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:04:08,376 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:04:08,377 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:04:08,390 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:04:08,408 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:04:08,410 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:04:08,423 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:04:08,425 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:04:08,437 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:04:08,462 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 6 proven. 4 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-05-02 17:04:08,462 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:04:08,462 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [652307499] [2021-05-02 17:04:08,462 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 17:04:08,462 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1749631798] [2021-05-02 17:04:08,463 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1749631798] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:04:08,463 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 17:04:08,463 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2021-05-02 17:04:08,463 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [714684104] [2021-05-02 17:04:08,463 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-05-02 17:04:08,463 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:04:08,463 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-05-02 17:04:08,464 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=70, Unknown=0, NotChecked=0, Total=90 [2021-05-02 17:04:08,464 INFO L87 Difference]: Start difference. First operand 53 states and 60 transitions. Second operand has 10 states, 9 states have (on average 2.111111111111111) internal successors, (19), 8 states have internal predecessors, (19), 4 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (5), 5 states have call predecessors, (5), 4 states have call successors, (5) [2021-05-02 17:04:08,577 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:04:08,577 INFO L93 Difference]: Finished difference Result 55 states and 61 transitions. [2021-05-02 17:04:08,577 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-02 17:04:08,577 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 9 states have (on average 2.111111111111111) internal successors, (19), 8 states have internal predecessors, (19), 4 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (5), 5 states have call predecessors, (5), 4 states have call successors, (5) Word has length 37 [2021-05-02 17:04:08,577 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:04:08,579 INFO L225 Difference]: With dead ends: 55 [2021-05-02 17:04:08,579 INFO L226 Difference]: Without dead ends: 49 [2021-05-02 17:04:08,580 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 28 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 97.9ms TimeCoverageRelationStatistics Valid=33, Invalid=123, Unknown=0, NotChecked=0, Total=156 [2021-05-02 17:04:08,580 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2021-05-02 17:04:08,586 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 49. [2021-05-02 17:04:08,586 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 49 states, 32 states have (on average 1.125) internal successors, (36), 34 states have internal predecessors, (36), 10 states have call successors, (10), 7 states have call predecessors, (10), 6 states have return successors, (8), 7 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-02 17:04:08,587 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 54 transitions. [2021-05-02 17:04:08,587 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 54 transitions. Word has length 37 [2021-05-02 17:04:08,587 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:04:08,587 INFO L480 AbstractCegarLoop]: Abstraction has 49 states and 54 transitions. [2021-05-02 17:04:08,587 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 10 states, 9 states have (on average 2.111111111111111) internal successors, (19), 8 states have internal predecessors, (19), 4 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (5), 5 states have call predecessors, (5), 4 states have call successors, (5) [2021-05-02 17:04:08,587 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 54 transitions. [2021-05-02 17:04:08,588 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2021-05-02 17:04:08,588 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:04:08,588 INFO L523 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:04:08,804 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:04:08,805 INFO L428 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:04:08,805 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:04:08,805 INFO L82 PathProgramCache]: Analyzing trace with hash -1224790937, now seen corresponding path program 3 times [2021-05-02 17:04:08,805 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:04:08,805 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [83758682] [2021-05-02 17:04:08,806 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:04:08,815 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 17:04:08,815 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [817770756] [2021-05-02 17:04:08,815 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true