/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/ps3-ll_unwindbound50.c -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-c225d54 [2021-05-02 16:43:50,144 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-05-02 16:43:50,146 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-05-02 16:43:50,170 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2021-05-02 16:43:50,180 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-05-02 16:43:50,181 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-05-02 16:43:50,182 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-05-02 16:43:50,183 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-05-02 16:43:50,184 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-05-02 16:43:50,185 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-05-02 16:43:50,186 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-05-02 16:43:50,188 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-05-02 16:43:50,189 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-05-02 16:43:50,190 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-05-02 16:43:50,191 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-05-02 16:43:50,192 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-05-02 16:43:50,194 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2021-05-02 16:43:50,201 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-05-02 16:43:50,202 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-05-02 16:43:50,202 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-05-02 16:43:50,203 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 16:43:50,223 INFO L113 SettingsManager]: Loading preferences was successful [2021-05-02 16:43:50,223 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-05-02 16:43:50,224 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-05-02 16:43:50,224 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-05-02 16:43:50,225 INFO L138 SettingsManager]: * Use SBE=true [2021-05-02 16:43:50,225 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-05-02 16:43:50,225 INFO L138 SettingsManager]: * sizeof long=4 [2021-05-02 16:43:50,225 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-05-02 16:43:50,226 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-05-02 16:43:50,226 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-05-02 16:43:50,226 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-05-02 16:43:50,226 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-05-02 16:43:50,227 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-05-02 16:43:50,227 INFO L138 SettingsManager]: * sizeof long double=12 [2021-05-02 16:43:50,227 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-05-02 16:43:50,227 INFO L138 SettingsManager]: * Use constant arrays=true [2021-05-02 16:43:50,227 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-05-02 16:43:50,228 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-05-02 16:43:50,228 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-05-02 16:43:50,228 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-05-02 16:43:50,228 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-02 16:43:50,229 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-05-02 16:43:50,229 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-05-02 16:43:50,229 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-05-02 16:43:50,229 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-05-02 16:43:50,230 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-05-02 16:43:50,230 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-05-02 16:43:50,230 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-05-02 16:43:50,230 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2021-05-02 16:43:50,581 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-05-02 16:43:50,609 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-05-02 16:43:50,612 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-05-02 16:43:50,613 INFO L271 PluginConnector]: Initializing CDTParser... [2021-05-02 16:43:50,614 INFO L275 PluginConnector]: CDTParser initialized [2021-05-02 16:43:50,615 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/nla-digbench-scaling/ps3-ll_unwindbound50.c [2021-05-02 16:43:50,685 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/a3adbda42/031f5bf77d2f4a729479ca6397d115df/FLAGfe15ea6b9 [2021-05-02 16:43:51,110 INFO L306 CDTParser]: Found 1 translation units. [2021-05-02 16:43:51,110 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/nla-digbench-scaling/ps3-ll_unwindbound50.c [2021-05-02 16:43:51,116 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/a3adbda42/031f5bf77d2f4a729479ca6397d115df/FLAGfe15ea6b9 [2021-05-02 16:43:51,128 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/a3adbda42/031f5bf77d2f4a729479ca6397d115df [2021-05-02 16:43:51,130 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-05-02 16:43:51,132 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2021-05-02 16:43:51,133 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-05-02 16:43:51,133 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-05-02 16:43:51,136 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-05-02 16:43:51,137 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 04:43:51" (1/1) ... [2021-05-02 16:43:51,138 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@47a414c2 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 04:43:51, skipping insertion in model container [2021-05-02 16:43:51,138 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 04:43:51" (1/1) ... [2021-05-02 16:43:51,144 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-05-02 16:43:51,155 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-05-02 16:43:51,262 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/ps3-ll_unwindbound50.c[458,471] [2021-05-02 16:43:51,273 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 16:43:51,279 INFO L203 MainTranslator]: Completed pre-run [2021-05-02 16:43:51,290 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/ps3-ll_unwindbound50.c[458,471] [2021-05-02 16:43:51,294 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 16:43:51,306 INFO L208 MainTranslator]: Completed translation [2021-05-02 16:43:51,307 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 04:43:51 WrapperNode [2021-05-02 16:43:51,307 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-05-02 16:43:51,308 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-05-02 16:43:51,308 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-05-02 16:43:51,308 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-05-02 16:43:51,330 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 04:43:51" (1/1) ... [2021-05-02 16:43:51,330 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 04:43:51" (1/1) ... [2021-05-02 16:43:51,338 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 04:43:51" (1/1) ... [2021-05-02 16:43:51,338 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 04:43:51" (1/1) ... [2021-05-02 16:43:51,357 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 04:43:51" (1/1) ... [2021-05-02 16:43:51,360 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 04:43:51" (1/1) ... [2021-05-02 16:43:51,361 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 04:43:51" (1/1) ... [2021-05-02 16:43:51,362 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-05-02 16:43:51,363 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-05-02 16:43:51,363 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-05-02 16:43:51,363 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-05-02 16:43:51,364 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 04:43:51" (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 16:43:51,417 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-05-02 16:43:51,418 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-05-02 16:43:51,418 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2021-05-02 16:43:51,418 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2021-05-02 16:43:51,418 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-05-02 16:43:51,418 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-05-02 16:43:51,418 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2021-05-02 16:43:51,419 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2021-05-02 16:43:51,419 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2021-05-02 16:43:51,419 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-05-02 16:43:51,419 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_short [2021-05-02 16:43:51,420 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2021-05-02 16:43:51,420 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-05-02 16:43:51,420 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-05-02 16:43:51,421 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-05-02 16:43:51,421 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-05-02 16:43:51,421 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-05-02 16:43:51,421 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-05-02 16:43:51,421 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-05-02 16:43:51,421 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-05-02 16:43:51,697 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-05-02 16:43:51,698 INFO L299 CfgBuilder]: Removed 1 assume(true) statements. [2021-05-02 16:43:51,699 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 04:43:51 BoogieIcfgContainer [2021-05-02 16:43:51,699 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-05-02 16:43:51,700 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-05-02 16:43:51,701 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-05-02 16:43:51,703 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-05-02 16:43:51,703 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.05 04:43:51" (1/3) ... [2021-05-02 16:43:51,704 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@614e88b0 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 04:43:51, skipping insertion in model container [2021-05-02 16:43:51,704 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 04:43:51" (2/3) ... [2021-05-02 16:43:51,704 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@614e88b0 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 04:43:51, skipping insertion in model container [2021-05-02 16:43:51,704 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 04:43:51" (3/3) ... [2021-05-02 16:43:51,706 INFO L111 eAbstractionObserver]: Analyzing ICFG ps3-ll_unwindbound50.c [2021-05-02 16:43:51,710 INFO L149 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-05-02 16:43:51,730 INFO L161 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-05-02 16:43:51,744 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-05-02 16:43:51,784 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-05-02 16:43:51,784 INFO L377 AbstractCegarLoop]: Hoare is true [2021-05-02 16:43:51,784 INFO L378 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-05-02 16:43:51,784 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-05-02 16:43:51,784 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-05-02 16:43:51,784 INFO L381 AbstractCegarLoop]: Difference is false [2021-05-02 16:43:51,785 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-05-02 16:43:51,785 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-05-02 16:43:51,825 INFO L276 IsEmpty]: Start isEmpty. Operand has 22 states, 13 states have (on average 1.3846153846153846) internal successors, (18), 14 states have internal predecessors, (18), 4 states have call successors, (4), 3 states have call predecessors, (4), 3 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-05-02 16:43:51,829 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-05-02 16:43:51,830 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 16:43:51,830 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 16:43:51,830 INFO L428 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 16:43:51,835 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 16:43:51,835 INFO L82 PathProgramCache]: Analyzing trace with hash 1665267581, now seen corresponding path program 1 times [2021-05-02 16:43:51,850 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 16:43:51,851 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [80692759] [2021-05-02 16:43:51,851 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 16:43:51,959 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 16:43:52,075 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 16:43:52,082 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 16:43:52,095 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 16:43:52,095 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 16:43:52,096 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [80692759] [2021-05-02 16:43:52,097 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [80692759] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 16:43:52,097 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 16:43:52,097 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-05-02 16:43:52,098 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [825622893] [2021-05-02 16:43:52,102 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-05-02 16:43:52,102 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 16:43:52,116 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-05-02 16:43:52,117 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-02 16:43:52,118 INFO L87 Difference]: Start difference. First operand has 22 states, 13 states have (on average 1.3846153846153846) internal successors, (18), 14 states have internal predecessors, (18), 4 states have call successors, (4), 3 states have call predecessors, (4), 3 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) Second operand has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 16:43:52,169 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 16:43:52,169 INFO L93 Difference]: Finished difference Result 39 states and 50 transitions. [2021-05-02 16:43:52,170 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-05-02 16:43:52,171 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 11 [2021-05-02 16:43:52,171 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 16:43:52,177 INFO L225 Difference]: With dead ends: 39 [2021-05-02 16:43:52,177 INFO L226 Difference]: Without dead ends: 18 [2021-05-02 16:43:52,179 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 51.5ms TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-02 16:43:52,193 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2021-05-02 16:43:52,207 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 17. [2021-05-02 16:43:52,208 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 17 states, 10 states have (on average 1.3) internal successors, (13), 11 states have internal predecessors, (13), 4 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 16:43:52,209 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 19 transitions. [2021-05-02 16:43:52,210 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 19 transitions. Word has length 11 [2021-05-02 16:43:52,210 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 16:43:52,210 INFO L480 AbstractCegarLoop]: Abstraction has 17 states and 19 transitions. [2021-05-02 16:43:52,211 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 16:43:52,211 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 19 transitions. [2021-05-02 16:43:52,211 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-05-02 16:43:52,211 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 16:43:52,212 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 16:43:52,212 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-05-02 16:43:52,212 INFO L428 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 16:43:52,213 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 16:43:52,213 INFO L82 PathProgramCache]: Analyzing trace with hash -318583316, now seen corresponding path program 1 times [2021-05-02 16:43:52,213 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 16:43:52,214 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1352769040] [2021-05-02 16:43:52,214 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 16:43:52,227 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 16:43:52,228 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [260190927] [2021-05-02 16:43:52,228 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 16:43:52,313 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 16:43:52,315 INFO L263 TraceCheckSpWp]: Trace formula consists of 105 conjuncts, 5 conjunts are in the unsatisfiable core [2021-05-02 16:43:52,319 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 16:43:52,359 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:43:52,364 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:43:52,366 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:43:52,383 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:43:52,387 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:43:52,402 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 16:43:52,403 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 16:43:52,403 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1352769040] [2021-05-02 16:43:52,403 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 16:43:52,403 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [260190927] [2021-05-02 16:43:52,403 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [260190927] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 16:43:52,403 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 16:43:52,404 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-05-02 16:43:52,404 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [284137531] [2021-05-02 16:43:52,405 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-05-02 16:43:52,405 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 16:43:52,406 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-05-02 16:43:52,406 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-02 16:43:52,406 INFO L87 Difference]: Start difference. First operand 17 states and 19 transitions. Second operand has 4 states, 4 states have (on average 2.0) internal successors, (8), 3 states have internal predecessors, (8), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 16:43:52,416 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 16:43:52,417 INFO L93 Difference]: Finished difference Result 26 states and 28 transitions. [2021-05-02 16:43:52,417 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-05-02 16:43:52,417 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.0) internal successors, (8), 3 states have internal predecessors, (8), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 12 [2021-05-02 16:43:52,418 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 16:43:52,418 INFO L225 Difference]: With dead ends: 26 [2021-05-02 16:43:52,418 INFO L226 Difference]: Without dead ends: 19 [2021-05-02 16:43:52,419 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 5.7ms TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-02 16:43:52,419 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2021-05-02 16:43:52,423 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2021-05-02 16:43:52,423 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19 states, 12 states have (on average 1.25) internal successors, (15), 13 states have internal predecessors, (15), 4 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 16:43:52,424 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 21 transitions. [2021-05-02 16:43:52,424 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 21 transitions. Word has length 12 [2021-05-02 16:43:52,424 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 16:43:52,424 INFO L480 AbstractCegarLoop]: Abstraction has 19 states and 21 transitions. [2021-05-02 16:43:52,425 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 4 states, 4 states have (on average 2.0) internal successors, (8), 3 states have internal predecessors, (8), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 16:43:52,425 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 21 transitions. [2021-05-02 16:43:52,425 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-05-02 16:43:52,425 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 16:43:52,425 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 16:43:52,648 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1 [2021-05-02 16:43:52,649 INFO L428 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 16:43:52,649 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 16:43:52,649 INFO L82 PathProgramCache]: Analyzing trace with hash -316795856, now seen corresponding path program 1 times [2021-05-02 16:43:52,650 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 16:43:52,650 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2027794542] [2021-05-02 16:43:52,650 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 16:43:52,662 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 16:43:52,662 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1426969279] [2021-05-02 16:43:52,662 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 16:43:52,714 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 16:43:52,715 INFO L263 TraceCheckSpWp]: Trace formula consists of 105 conjuncts, 10 conjunts are in the unsatisfiable core [2021-05-02 16:43:52,717 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 16:43:52,756 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 16:43:52,757 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 16:43:52,757 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2027794542] [2021-05-02 16:43:52,757 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 16:43:52,757 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1426969279] [2021-05-02 16:43:52,757 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1426969279] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 16:43:52,757 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 16:43:52,758 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-05-02 16:43:52,758 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1565112047] [2021-05-02 16:43:52,758 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-05-02 16:43:52,758 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 16:43:52,759 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-05-02 16:43:52,759 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-05-02 16:43:52,759 INFO L87 Difference]: Start difference. First operand 19 states and 21 transitions. Second operand has 5 states, 5 states have (on average 1.6) internal successors, (8), 4 states have internal predecessors, (8), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 16:43:52,810 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 16:43:52,810 INFO L93 Difference]: Finished difference Result 28 states and 31 transitions. [2021-05-02 16:43:52,811 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-05-02 16:43:52,812 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 1.6) internal successors, (8), 4 states have internal predecessors, (8), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 12 [2021-05-02 16:43:52,812 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 16:43:52,812 INFO L225 Difference]: With dead ends: 28 [2021-05-02 16:43:52,812 INFO L226 Difference]: Without dead ends: 25 [2021-05-02 16:43:52,813 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 16.3ms TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-05-02 16:43:52,813 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2021-05-02 16:43:52,818 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2021-05-02 16:43:52,818 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 25 states, 16 states have (on average 1.1875) internal successors, (19), 17 states have internal predecessors, (19), 5 states have call successors, (5), 4 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 16:43:52,819 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 27 transitions. [2021-05-02 16:43:52,819 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 27 transitions. Word has length 12 [2021-05-02 16:43:52,819 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 16:43:52,819 INFO L480 AbstractCegarLoop]: Abstraction has 25 states and 27 transitions. [2021-05-02 16:43:52,819 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 5 states, 5 states have (on average 1.6) internal successors, (8), 4 states have internal predecessors, (8), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 16:43:52,819 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 27 transitions. [2021-05-02 16:43:52,820 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-02 16:43:52,820 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 16:43:52,820 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 16:43:53,041 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 16:43:53,041 INFO L428 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 16:43:53,042 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 16:43:53,042 INFO L82 PathProgramCache]: Analyzing trace with hash -2089867248, now seen corresponding path program 1 times [2021-05-02 16:43:53,042 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 16:43:53,042 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1043497599] [2021-05-02 16:43:53,042 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 16:43:53,052 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 16:43:53,052 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [282582226] [2021-05-02 16:43:53,053 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 16:43:53,109 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 16:43:53,110 INFO L263 TraceCheckSpWp]: Trace formula consists of 126 conjuncts, 7 conjunts are in the unsatisfiable core [2021-05-02 16:43:53,112 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 16:43:53,135 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:43:53,139 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:43:53,140 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:43:53,164 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:43:53,173 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:43:53,175 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:43:53,208 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:43:53,212 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:43:53,227 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 16:43:53,228 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 16:43:53,228 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1043497599] [2021-05-02 16:43:53,228 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 16:43:53,228 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [282582226] [2021-05-02 16:43:53,228 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [282582226] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 16:43:53,228 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 16:43:53,229 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5] total 5 [2021-05-02 16:43:53,229 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [432394839] [2021-05-02 16:43:53,229 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-05-02 16:43:53,229 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 16:43:53,230 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-05-02 16:43:53,230 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-05-02 16:43:53,230 INFO L87 Difference]: Start difference. First operand 25 states and 27 transitions. Second operand has 5 states, 5 states have (on average 2.8) internal successors, (14), 4 states have internal predecessors, (14), 4 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 16:43:53,255 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 16:43:53,255 INFO L93 Difference]: Finished difference Result 34 states and 36 transitions. [2021-05-02 16:43:53,256 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-02 16:43:53,256 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.8) internal successors, (14), 4 states have internal predecessors, (14), 4 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 20 [2021-05-02 16:43:53,256 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 16:43:53,257 INFO L225 Difference]: With dead ends: 34 [2021-05-02 16:43:53,257 INFO L226 Difference]: Without dead ends: 27 [2021-05-02 16:43:53,257 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 16 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 26.0ms TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-05-02 16:43:53,257 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2021-05-02 16:43:53,261 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2021-05-02 16:43:53,261 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27 states, 18 states have (on average 1.1666666666666667) internal successors, (21), 19 states have internal predecessors, (21), 5 states have call successors, (5), 4 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 16:43:53,262 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 29 transitions. [2021-05-02 16:43:53,262 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 29 transitions. Word has length 20 [2021-05-02 16:43:53,262 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 16:43:53,262 INFO L480 AbstractCegarLoop]: Abstraction has 27 states and 29 transitions. [2021-05-02 16:43:53,263 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 5 states, 5 states have (on average 2.8) internal successors, (14), 4 states have internal predecessors, (14), 4 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 16:43:53,263 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 29 transitions. [2021-05-02 16:43:53,263 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-02 16:43:53,263 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 16:43:53,263 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 16:43:53,487 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 16:43:53,487 INFO L428 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 16:43:53,488 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 16:43:53,488 INFO L82 PathProgramCache]: Analyzing trace with hash -2088079788, now seen corresponding path program 1 times [2021-05-02 16:43:53,488 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 16:43:53,488 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1754897995] [2021-05-02 16:43:53,488 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 16:43:53,499 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 16:43:53,499 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1165598340] [2021-05-02 16:43:53,499 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 16:43:53,563 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 16:43:53,565 INFO L263 TraceCheckSpWp]: Trace formula consists of 126 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-02 16:43:53,566 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 16:43:53,705 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 16:43:53,706 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 16:43:53,706 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1754897995] [2021-05-02 16:43:53,706 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 16:43:53,706 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1165598340] [2021-05-02 16:43:53,706 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1165598340] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 16:43:53,706 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 16:43:53,707 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2021-05-02 16:43:53,707 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [403119148] [2021-05-02 16:43:53,708 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-05-02 16:43:53,708 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 16:43:53,709 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-05-02 16:43:53,710 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2021-05-02 16:43:53,710 INFO L87 Difference]: Start difference. First operand 27 states and 29 transitions. Second operand has 8 states, 8 states have (on average 1.75) internal successors, (14), 7 states have internal predecessors, (14), 3 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 16:43:53,800 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 16:43:53,801 INFO L93 Difference]: Finished difference Result 36 states and 39 transitions. [2021-05-02 16:43:53,801 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-02 16:43:53,802 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 1.75) internal successors, (14), 7 states have internal predecessors, (14), 3 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 20 [2021-05-02 16:43:53,802 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 16:43:53,804 INFO L225 Difference]: With dead ends: 36 [2021-05-02 16:43:53,804 INFO L226 Difference]: Without dead ends: 33 [2021-05-02 16:43:53,806 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 12 SyntacticMatches, 1 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 54.9ms TimeCoverageRelationStatistics Valid=25, Invalid=65, Unknown=0, NotChecked=0, Total=90 [2021-05-02 16:43:53,806 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2021-05-02 16:43:53,817 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2021-05-02 16:43:53,818 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 33 states, 22 states have (on average 1.1363636363636365) internal successors, (25), 23 states have internal predecessors, (25), 6 states have call successors, (6), 5 states have call predecessors, (6), 4 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-05-02 16:43:53,822 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 35 transitions. [2021-05-02 16:43:53,822 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 35 transitions. Word has length 20 [2021-05-02 16:43:53,823 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 16:43:53,823 INFO L480 AbstractCegarLoop]: Abstraction has 33 states and 35 transitions. [2021-05-02 16:43:53,823 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 8 states, 8 states have (on average 1.75) internal successors, (14), 7 states have internal predecessors, (14), 3 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 16:43:53,824 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 35 transitions. [2021-05-02 16:43:53,825 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2021-05-02 16:43:53,825 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 16:43:53,825 INFO L523 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 16:43:54,028 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 16:43:54,029 INFO L428 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 16:43:54,029 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 16:43:54,030 INFO L82 PathProgramCache]: Analyzing trace with hash -696181196, now seen corresponding path program 2 times [2021-05-02 16:43:54,030 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 16:43:54,030 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [802490380] [2021-05-02 16:43:54,030 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 16:43:54,040 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 16:43:54,040 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2017616647] [2021-05-02 16:43:54,040 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 16:43:54,116 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 16:43:54,116 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 16:43:54,117 INFO L263 TraceCheckSpWp]: Trace formula consists of 147 conjuncts, 9 conjunts are in the unsatisfiable core [2021-05-02 16:43:54,119 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 16:43:54,151 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:43:54,154 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:43:54,155 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:43:54,162 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:43:54,165 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:43:54,166 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:43:54,192 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:43:54,197 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:43:54,199 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:43:54,222 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:43:54,226 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:43:54,240 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 16:43:54,241 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 16:43:54,241 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [802490380] [2021-05-02 16:43:54,241 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 16:43:54,241 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2017616647] [2021-05-02 16:43:54,241 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2017616647] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 16:43:54,241 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 16:43:54,241 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2021-05-02 16:43:54,241 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [493921854] [2021-05-02 16:43:54,242 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-02 16:43:54,242 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 16:43:54,242 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-02 16:43:54,242 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-05-02 16:43:54,242 INFO L87 Difference]: Start difference. First operand 33 states and 35 transitions. Second operand has 6 states, 6 states have (on average 3.3333333333333335) internal successors, (20), 5 states have internal predecessors, (20), 5 states have call successors, (5), 5 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 16:43:54,297 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 16:43:54,297 INFO L93 Difference]: Finished difference Result 42 states and 44 transitions. [2021-05-02 16:43:54,297 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-02 16:43:54,298 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 3.3333333333333335) internal successors, (20), 5 states have internal predecessors, (20), 5 states have call successors, (5), 5 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Word has length 28 [2021-05-02 16:43:54,298 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 16:43:54,300 INFO L225 Difference]: With dead ends: 42 [2021-05-02 16:43:54,300 INFO L226 Difference]: Without dead ends: 35 [2021-05-02 16:43:54,303 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 23 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 28.2ms TimeCoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2021-05-02 16:43:54,304 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2021-05-02 16:43:54,313 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 35. [2021-05-02 16:43:54,313 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 35 states, 24 states have (on average 1.125) internal successors, (27), 25 states have internal predecessors, (27), 6 states have call successors, (6), 5 states have call predecessors, (6), 4 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-05-02 16:43:54,315 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 37 transitions. [2021-05-02 16:43:54,315 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 37 transitions. Word has length 28 [2021-05-02 16:43:54,316 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 16:43:54,316 INFO L480 AbstractCegarLoop]: Abstraction has 35 states and 37 transitions. [2021-05-02 16:43:54,316 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 3.3333333333333335) internal successors, (20), 5 states have internal predecessors, (20), 5 states have call successors, (5), 5 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 16:43:54,316 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 37 transitions. [2021-05-02 16:43:54,319 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2021-05-02 16:43:54,319 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 16:43:54,319 INFO L523 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 16:43:54,525 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2021-05-02 16:43:54,525 INFO L428 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 16:43:54,525 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 16:43:54,525 INFO L82 PathProgramCache]: Analyzing trace with hash -694393736, now seen corresponding path program 2 times [2021-05-02 16:43:54,526 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 16:43:54,526 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [872553100] [2021-05-02 16:43:54,526 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 16:43:54,534 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 16:43:54,534 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [14445611] [2021-05-02 16:43:54,534 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 16:43:54,622 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 16:43:54,622 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 16:43:54,623 INFO L263 TraceCheckSpWp]: Trace formula consists of 147 conjuncts, 28 conjunts are in the unsatisfiable core [2021-05-02 16:43:54,625 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 16:43:54,792 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 16:43:54,792 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 16:43:54,792 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [872553100] [2021-05-02 16:43:54,792 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 16:43:54,792 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [14445611] [2021-05-02 16:43:54,792 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [14445611] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 16:43:54,793 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 16:43:54,793 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2021-05-02 16:43:54,793 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1486844874] [2021-05-02 16:43:54,793 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-02 16:43:54,793 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 16:43:54,794 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-02 16:43:54,794 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=56, Unknown=0, NotChecked=0, Total=72 [2021-05-02 16:43:54,794 INFO L87 Difference]: Start difference. First operand 35 states and 37 transitions. Second operand has 9 states, 9 states have (on average 1.8888888888888888) internal successors, (17), 8 states have internal predecessors, (17), 4 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 16:43:54,904 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 16:43:54,904 INFO L93 Difference]: Finished difference Result 44 states and 47 transitions. [2021-05-02 16:43:54,905 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-02 16:43:54,905 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 1.8888888888888888) internal successors, (17), 8 states have internal predecessors, (17), 4 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Word has length 28 [2021-05-02 16:43:54,905 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 16:43:54,906 INFO L225 Difference]: With dead ends: 44 [2021-05-02 16:43:54,906 INFO L226 Difference]: Without dead ends: 41 [2021-05-02 16:43:54,906 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 18 SyntacticMatches, 2 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 82.2ms TimeCoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2021-05-02 16:43:54,906 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2021-05-02 16:43:54,910 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 41. [2021-05-02 16:43:54,911 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 41 states, 28 states have (on average 1.1071428571428572) internal successors, (31), 29 states have internal predecessors, (31), 7 states have call successors, (7), 6 states have call predecessors, (7), 5 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-05-02 16:43:54,911 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 43 transitions. [2021-05-02 16:43:54,912 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 43 transitions. Word has length 28 [2021-05-02 16:43:54,912 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 16:43:54,912 INFO L480 AbstractCegarLoop]: Abstraction has 41 states and 43 transitions. [2021-05-02 16:43:54,912 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 9 states, 9 states have (on average 1.8888888888888888) internal successors, (17), 8 states have internal predecessors, (17), 4 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 16:43:54,912 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 43 transitions. [2021-05-02 16:43:54,913 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2021-05-02 16:43:54,913 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 16:43:54,913 INFO L523 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 16:43:55,116 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 16:43:55,118 INFO L428 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 16:43:55,119 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 16:43:55,119 INFO L82 PathProgramCache]: Analyzing trace with hash 618442840, now seen corresponding path program 3 times [2021-05-02 16:43:55,119 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 16:43:55,119 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1180465686] [2021-05-02 16:43:55,119 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 16:43:55,132 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 16:43:55,133 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1038384155] [2021-05-02 16:43:55,133 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 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