/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_valuebound5.c -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-c225d54 [2021-05-02 17:10:42,096 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-05-02 17:10:42,098 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-05-02 17:10:42,130 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2021-05-02 17:10:42,145 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-05-02 17:10:42,146 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-05-02 17:10:42,148 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-05-02 17:10:42,149 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-05-02 17:10:42,151 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-05-02 17:10:42,151 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-05-02 17:10:42,153 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-05-02 17:10:42,159 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-05-02 17:10:42,160 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-05-02 17:10:42,161 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-05-02 17:10:42,162 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-05-02 17:10:42,164 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-05-02 17:10:42,168 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2021-05-02 17:10:42,185 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-05-02 17:10:42,186 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-05-02 17:10:42,202 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-05-02 17:10:42,203 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 17:10:42,246 INFO L113 SettingsManager]: Loading preferences was successful [2021-05-02 17:10:42,246 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-05-02 17:10:42,248 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-05-02 17:10:42,248 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-05-02 17:10:42,248 INFO L138 SettingsManager]: * Use SBE=true [2021-05-02 17:10:42,248 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-05-02 17:10:42,248 INFO L138 SettingsManager]: * sizeof long=4 [2021-05-02 17:10:42,249 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-05-02 17:10:42,249 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-05-02 17:10:42,249 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-05-02 17:10:42,249 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-05-02 17:10:42,249 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-05-02 17:10:42,249 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-05-02 17:10:42,250 INFO L138 SettingsManager]: * sizeof long double=12 [2021-05-02 17:10:42,250 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-05-02 17:10:42,250 INFO L138 SettingsManager]: * Use constant arrays=true [2021-05-02 17:10:42,250 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-05-02 17:10:42,250 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-05-02 17:10:42,250 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-05-02 17:10:42,250 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-05-02 17:10:42,250 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-02 17:10:42,250 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-05-02 17:10:42,251 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-05-02 17:10:42,251 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-05-02 17:10:42,251 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-05-02 17:10:42,251 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-05-02 17:10:42,251 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-05-02 17:10:42,251 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-05-02 17:10:42,251 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2021-05-02 17:10:42,587 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-05-02 17:10:42,612 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-05-02 17:10:42,614 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-05-02 17:10:42,614 INFO L271 PluginConnector]: Initializing CDTParser... [2021-05-02 17:10:42,615 INFO L275 PluginConnector]: CDTParser initialized [2021-05-02 17:10:42,615 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/nla-digbench-scaling/ps5-ll_valuebound5.c [2021-05-02 17:10:42,702 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/d64998364/848ec10a0a5f4b33a4eff9a97ad4c425/FLAGd1c5631dd [2021-05-02 17:10:43,195 INFO L306 CDTParser]: Found 1 translation units. [2021-05-02 17:10:43,212 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/nla-digbench-scaling/ps5-ll_valuebound5.c [2021-05-02 17:10:43,217 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/d64998364/848ec10a0a5f4b33a4eff9a97ad4c425/FLAGd1c5631dd [2021-05-02 17:10:43,690 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/d64998364/848ec10a0a5f4b33a4eff9a97ad4c425 [2021-05-02 17:10:43,692 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-05-02 17:10:43,693 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2021-05-02 17:10:43,694 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-05-02 17:10:43,694 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-05-02 17:10:43,711 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-05-02 17:10:43,712 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 05:10:43" (1/1) ... [2021-05-02 17:10:43,712 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@340090f7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 05:10:43, skipping insertion in model container [2021-05-02 17:10:43,713 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 05:10:43" (1/1) ... [2021-05-02 17:10:43,720 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-05-02 17:10:43,732 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-05-02 17:10:43,843 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_valuebound5.c[458,471] [2021-05-02 17:10:43,852 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 17:10:43,857 INFO L203 MainTranslator]: Completed pre-run [2021-05-02 17:10:43,900 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_valuebound5.c[458,471] [2021-05-02 17:10:43,917 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 17:10:43,927 INFO L208 MainTranslator]: Completed translation [2021-05-02 17:10:43,928 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 05:10:43 WrapperNode [2021-05-02 17:10:43,928 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-05-02 17:10:43,929 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-05-02 17:10:43,929 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-05-02 17:10:43,930 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-05-02 17:10:43,938 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 05:10:43" (1/1) ... [2021-05-02 17:10:43,938 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 05:10:43" (1/1) ... [2021-05-02 17:10:43,942 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 05:10:43" (1/1) ... [2021-05-02 17:10:43,943 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 05:10:43" (1/1) ... [2021-05-02 17:10:43,952 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 05:10:43" (1/1) ... [2021-05-02 17:10:43,955 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 05:10:43" (1/1) ... [2021-05-02 17:10:43,956 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 05:10:43" (1/1) ... [2021-05-02 17:10:43,960 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-05-02 17:10:43,961 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-05-02 17:10:43,961 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-05-02 17:10:43,961 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-05-02 17:10:43,962 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 05:10:43" (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 17:10:44,017 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-05-02 17:10:44,017 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-05-02 17:10:44,017 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2021-05-02 17:10:44,017 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2021-05-02 17:10:44,017 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-05-02 17:10:44,017 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-05-02 17:10:44,018 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2021-05-02 17:10:44,018 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2021-05-02 17:10:44,018 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2021-05-02 17:10:44,018 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-05-02 17:10:44,018 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_short [2021-05-02 17:10:44,018 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2021-05-02 17:10:44,019 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-05-02 17:10:44,019 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-05-02 17:10:44,019 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-05-02 17:10:44,020 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-05-02 17:10:44,020 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-05-02 17:10:44,020 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-05-02 17:10:44,020 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-05-02 17:10:44,020 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-05-02 17:10:44,239 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-05-02 17:10:44,239 INFO L299 CfgBuilder]: Removed 1 assume(true) statements. [2021-05-02 17:10:44,240 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 05:10:44 BoogieIcfgContainer [2021-05-02 17:10:44,240 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-05-02 17:10:44,241 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-05-02 17:10:44,241 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-05-02 17:10:44,243 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-05-02 17:10:44,244 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.05 05:10:43" (1/3) ... [2021-05-02 17:10:44,244 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6ba0b6df and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 05:10:44, skipping insertion in model container [2021-05-02 17:10:44,244 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 05:10:43" (2/3) ... [2021-05-02 17:10:44,244 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6ba0b6df and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 05:10:44, skipping insertion in model container [2021-05-02 17:10:44,245 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 05:10:44" (3/3) ... [2021-05-02 17:10:44,245 INFO L111 eAbstractionObserver]: Analyzing ICFG ps5-ll_valuebound5.c [2021-05-02 17:10:44,253 INFO L149 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-05-02 17:10:44,255 INFO L161 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-05-02 17:10:44,268 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-05-02 17:10:44,296 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-05-02 17:10:44,296 INFO L377 AbstractCegarLoop]: Hoare is true [2021-05-02 17:10:44,296 INFO L378 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-05-02 17:10:44,296 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-05-02 17:10:44,296 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-05-02 17:10:44,296 INFO L381 AbstractCegarLoop]: Difference is false [2021-05-02 17:10:44,296 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-05-02 17:10:44,296 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-05-02 17:10:44,317 INFO L276 IsEmpty]: Start isEmpty. Operand has 29 states, 16 states have (on average 1.375) internal successors, (22), 17 states have internal predecessors, (22), 7 states have call successors, (7), 4 states have call predecessors, (7), 4 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2021-05-02 17:10:44,328 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-05-02 17:10:44,328 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:10:44,328 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:10:44,328 INFO L428 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:10:44,332 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:10:44,332 INFO L82 PathProgramCache]: Analyzing trace with hash 1098891495, now seen corresponding path program 1 times [2021-05-02 17:10:44,353 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:10:44,354 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [844234008] [2021-05-02 17:10:44,354 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:10:44,490 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:10:44,582 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:10:44,586 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:10:44,599 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-02 17:10:44,601 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:10:44,609 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2021-05-02 17:10:44,610 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:10:44,617 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 17:10:44,617 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:10:44,617 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [844234008] [2021-05-02 17:10:44,618 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [844234008] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 17:10:44,618 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 17:10:44,618 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-05-02 17:10:44,618 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1191404759] [2021-05-02 17:10:44,621 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-05-02 17:10:44,621 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:10:44,630 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-05-02 17:10:44,631 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-02 17:10:44,632 INFO L87 Difference]: Start difference. First operand has 29 states, 16 states have (on average 1.375) internal successors, (22), 17 states have internal predecessors, (22), 7 states have call successors, (7), 4 states have call predecessors, (7), 4 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) 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, (5), 3 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 17:10:44,717 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:10:44,717 INFO L93 Difference]: Finished difference Result 51 states and 69 transitions. [2021-05-02 17:10:44,717 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-05-02 17:10:44,719 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, (5), 3 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 22 [2021-05-02 17:10:44,719 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:10:44,725 INFO L225 Difference]: With dead ends: 51 [2021-05-02 17:10:44,725 INFO L226 Difference]: Without dead ends: 24 [2021-05-02 17:10:44,727 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 41.8ms TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-02 17:10:44,738 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2021-05-02 17:10:44,764 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2021-05-02 17:10:44,765 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24 states, 13 states have (on average 1.1538461538461537) internal successors, (15), 14 states have internal predecessors, (15), 7 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-05-02 17:10:44,766 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 27 transitions. [2021-05-02 17:10:44,767 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 27 transitions. Word has length 22 [2021-05-02 17:10:44,767 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:10:44,767 INFO L480 AbstractCegarLoop]: Abstraction has 24 states and 27 transitions. [2021-05-02 17:10:44,767 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, (5), 3 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 17:10:44,768 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 27 transitions. [2021-05-02 17:10:44,769 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-05-02 17:10:44,769 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:10:44,769 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:10:44,770 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-05-02 17:10:44,770 INFO L428 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:10:44,771 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:10:44,771 INFO L82 PathProgramCache]: Analyzing trace with hash 769620075, now seen corresponding path program 1 times [2021-05-02 17:10:44,771 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:10:44,772 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [820995534] [2021-05-02 17:10:44,772 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:10:44,809 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 17:10:44,809 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1841543647] [2021-05-02 17:10:44,809 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 17:10:44,903 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:10:44,905 INFO L263 TraceCheckSpWp]: Trace formula consists of 111 conjuncts, 15 conjunts are in the unsatisfiable core [2021-05-02 17:10:44,909 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:10:44,950 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:10:44,998 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-02 17:10:44,999 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:10:44,999 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [820995534] [2021-05-02 17:10:44,999 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 17:10:44,999 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1841543647] [2021-05-02 17:10:44,999 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1841543647] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:10:44,999 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 17:10:44,999 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2021-05-02 17:10:45,000 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1249988437] [2021-05-02 17:10:45,000 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-05-02 17:10:45,000 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:10:45,001 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-05-02 17:10:45,001 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-05-02 17:10:45,001 INFO L87 Difference]: Start difference. First operand 24 states and 27 transitions. Second operand has 7 states, 7 states have (on average 2.0) internal successors, (14), 6 states have internal predecessors, (14), 2 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) [2021-05-02 17:10:45,111 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:10:45,111 INFO L93 Difference]: Finished difference Result 35 states and 40 transitions. [2021-05-02 17:10:45,111 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-05-02 17:10:45,112 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 2.0) internal successors, (14), 6 states have internal predecessors, (14), 2 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) Word has length 22 [2021-05-02 17:10:45,112 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:10:45,113 INFO L225 Difference]: With dead ends: 35 [2021-05-02 17:10:45,113 INFO L226 Difference]: Without dead ends: 31 [2021-05-02 17:10:45,113 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 16 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 35.8ms TimeCoverageRelationStatistics Valid=19, Invalid=53, Unknown=0, NotChecked=0, Total=72 [2021-05-02 17:10:45,114 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2021-05-02 17:10:45,119 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 31. [2021-05-02 17:10:45,119 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 31 states, 18 states have (on average 1.1111111111111112) internal successors, (20), 19 states have internal predecessors, (20), 8 states have call successors, (8), 5 states have call predecessors, (8), 4 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-05-02 17:10:45,120 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 34 transitions. [2021-05-02 17:10:45,120 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 34 transitions. Word has length 22 [2021-05-02 17:10:45,120 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:10:45,120 INFO L480 AbstractCegarLoop]: Abstraction has 31 states and 34 transitions. [2021-05-02 17:10:45,120 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 7 states, 7 states have (on average 2.0) internal successors, (14), 6 states have internal predecessors, (14), 2 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) [2021-05-02 17:10:45,121 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 34 transitions. [2021-05-02 17:10:45,123 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2021-05-02 17:10:45,123 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:10:45,123 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:10:45,339 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1 [2021-05-02 17:10:45,340 INFO L428 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:10:45,341 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:10:45,341 INFO L82 PathProgramCache]: Analyzing trace with hash 645812411, now seen corresponding path program 1 times [2021-05-02 17:10:45,341 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:10:45,341 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1468372933] [2021-05-02 17:10:45,341 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:10:45,349 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 17:10:45,349 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [258571417] [2021-05-02 17:10:45,350 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 17:10:45,456 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:10:45,457 INFO L263 TraceCheckSpWp]: Trace formula consists of 128 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-02 17:10:45,459 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:10:45,504 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:10:45,619 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 2 proven. 5 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-02 17:10:45,619 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:10:45,619 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1468372933] [2021-05-02 17:10:45,619 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 17:10:45,620 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [258571417] [2021-05-02 17:10:45,620 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [258571417] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:10:45,620 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 17:10:45,620 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2021-05-02 17:10:45,620 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1773726908] [2021-05-02 17:10:45,620 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-05-02 17:10:45,620 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:10:45,621 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-05-02 17:10:45,621 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2021-05-02 17:10:45,621 INFO L87 Difference]: Start difference. First operand 31 states and 34 transitions. Second operand has 8 states, 8 states have (on average 2.375) internal successors, (19), 7 states have internal predecessors, (19), 3 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-02 17:10:45,700 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:10:45,700 INFO L93 Difference]: Finished difference Result 42 states and 47 transitions. [2021-05-02 17:10:45,701 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-02 17:10:45,701 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 2.375) internal successors, (19), 7 states have internal predecessors, (19), 3 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) Word has length 29 [2021-05-02 17:10:45,702 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:10:45,704 INFO L225 Difference]: With dead ends: 42 [2021-05-02 17:10:45,704 INFO L226 Difference]: Without dead ends: 40 [2021-05-02 17:10:45,705 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 22 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 47.8ms TimeCoverageRelationStatistics Valid=21, Invalid=69, Unknown=0, NotChecked=0, Total=90 [2021-05-02 17:10:45,705 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2021-05-02 17:10:45,712 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 39. [2021-05-02 17:10:45,725 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 39 states, 23 states have (on average 1.1304347826086956) internal successors, (26), 25 states have internal predecessors, (26), 10 states have call successors, (10), 6 states have call predecessors, (10), 5 states have return successors, (8), 7 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-02 17:10:45,726 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 44 transitions. [2021-05-02 17:10:45,726 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 44 transitions. Word has length 29 [2021-05-02 17:10:45,726 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:10:45,726 INFO L480 AbstractCegarLoop]: Abstraction has 39 states and 44 transitions. [2021-05-02 17:10:45,726 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 8 states, 8 states have (on average 2.375) internal successors, (19), 7 states have internal predecessors, (19), 3 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-02 17:10:45,726 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 44 transitions. [2021-05-02 17:10:45,727 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2021-05-02 17:10:45,727 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:10:45,727 INFO L523 BasicCegarLoop]: trace histogram [3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:10:45,928 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:10:45,928 INFO L428 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:10:45,929 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:10:45,929 INFO L82 PathProgramCache]: Analyzing trace with hash 1415216747, now seen corresponding path program 2 times [2021-05-02 17:10:45,929 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:10:45,929 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [323238980] [2021-05-02 17:10:45,929 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:10:45,937 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 17:10:45,937 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [924239186] [2021-05-02 17:10:45,937 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:10:46,112 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 17:10:46,112 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 17:10:46,113 INFO L263 TraceCheckSpWp]: Trace formula consists of 145 conjuncts, 28 conjunts are in the unsatisfiable core [2021-05-02 17:10:46,116 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:10:46,145 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:10:46,296 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 6 proven. 11 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-05-02 17:10:46,296 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:10:46,296 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [323238980] [2021-05-02 17:10:46,296 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 17:10:46,296 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [924239186] [2021-05-02 17:10:46,296 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [924239186] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:10:46,296 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 17:10:46,297 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2021-05-02 17:10:46,297 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [556451770] [2021-05-02 17:10:46,297 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-05-02 17:10:46,297 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:10:46,297 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-05-02 17:10:46,297 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=90, Unknown=0, NotChecked=0, Total=110 [2021-05-02 17:10:46,298 INFO L87 Difference]: Start difference. First operand 39 states and 44 transitions. Second operand has 11 states, 11 states have (on average 2.1818181818181817) internal successors, (24), 10 states have internal predecessors, (24), 4 states have call successors, (7), 2 states have call predecessors, (7), 3 states have return successors, (5), 3 states have call predecessors, (5), 3 states have call successors, (5) [2021-05-02 17:10:46,450 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:10:46,451 INFO L93 Difference]: Finished difference Result 51 states and 58 transitions. [2021-05-02 17:10:46,451 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-02 17:10:46,451 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 2.1818181818181817) internal successors, (24), 10 states have internal predecessors, (24), 4 states have call successors, (7), 2 states have call predecessors, (7), 3 states have return successors, (5), 3 states have call predecessors, (5), 3 states have call successors, (5) Word has length 36 [2021-05-02 17:10:46,451 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:10:46,452 INFO L225 Difference]: With dead ends: 51 [2021-05-02 17:10:46,452 INFO L226 Difference]: Without dead ends: 49 [2021-05-02 17:10:46,452 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 25 SyntacticMatches, 1 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 88.3ms TimeCoverageRelationStatistics Valid=35, Invalid=147, Unknown=0, NotChecked=0, Total=182 [2021-05-02 17:10:46,453 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2021-05-02 17:10:46,458 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 47. [2021-05-02 17:10:46,458 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 47 states, 28 states have (on average 1.1428571428571428) internal successors, (32), 31 states have internal predecessors, (32), 12 states have call successors, (12), 7 states have call predecessors, (12), 6 states have return successors, (10), 8 states have call predecessors, (10), 10 states have call successors, (10) [2021-05-02 17:10:46,459 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 54 transitions. [2021-05-02 17:10:46,459 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 54 transitions. Word has length 36 [2021-05-02 17:10:46,460 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:10:46,460 INFO L480 AbstractCegarLoop]: Abstraction has 47 states and 54 transitions. [2021-05-02 17:10:46,460 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 11 states, 11 states have (on average 2.1818181818181817) internal successors, (24), 10 states have internal predecessors, (24), 4 states have call successors, (7), 2 states have call predecessors, (7), 3 states have return successors, (5), 3 states have call predecessors, (5), 3 states have call successors, (5) [2021-05-02 17:10:46,460 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 54 transitions. [2021-05-02 17:10:46,461 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2021-05-02 17:10:46,461 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:10:46,461 INFO L523 BasicCegarLoop]: trace histogram [4, 3, 3, 2, 2, 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 17:10:46,664 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:10:46,665 INFO L428 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:10:46,665 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:10:46,665 INFO L82 PathProgramCache]: Analyzing trace with hash 463554397, now seen corresponding path program 1 times [2021-05-02 17:10:46,665 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:10:46,665 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [117758564] [2021-05-02 17:10:46,665 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:10:46,673 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 17:10:46,673 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [253972777] [2021-05-02 17:10:46,673 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 17:10:46,738 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:10:46,739 INFO L263 TraceCheckSpWp]: Trace formula consists of 147 conjuncts, 20 conjunts are in the unsatisfiable core [2021-05-02 17:10:46,742 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:10:46,812 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:10:46,814 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:10:46,856 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:10:46,858 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:10:46,897 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:10:46,899 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:10:46,901 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:10:46,902 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:10:46,920 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:10:46,942 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:10:46,946 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:10:46,959 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:10:46,962 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:10:46,971 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:10:46,993 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 6 proven. 6 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2021-05-02 17:10:46,993 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:10:46,993 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [117758564] [2021-05-02 17:10:46,993 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 17:10:46,993 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [253972777] [2021-05-02 17:10:46,994 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [253972777] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:10:46,994 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 17:10:46,994 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2021-05-02 17:10:46,994 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2142913961] [2021-05-02 17:10:46,994 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-05-02 17:10:46,994 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:10:46,995 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-05-02 17:10:46,995 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=70, Unknown=0, NotChecked=0, Total=90 [2021-05-02 17:10:46,995 INFO L87 Difference]: Start difference. First operand 47 states and 54 transitions. Second operand has 10 states, 9 states have (on average 2.2222222222222223) internal successors, (20), 8 states have internal predecessors, (20), 5 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (6), 5 states have call predecessors, (6), 5 states have call successors, (6) [2021-05-02 17:10:47,118 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:10:47,118 INFO L93 Difference]: Finished difference Result 56 states and 62 transitions. [2021-05-02 17:10:47,118 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-02 17:10:47,118 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 9 states have (on average 2.2222222222222223) internal successors, (20), 8 states have internal predecessors, (20), 5 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (6), 5 states have call predecessors, (6), 5 states have call successors, (6) Word has length 40 [2021-05-02 17:10:47,119 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:10:47,120 INFO L225 Difference]: With dead ends: 56 [2021-05-02 17:10:47,120 INFO L226 Difference]: Without dead ends: 48 [2021-05-02 17:10:47,120 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 31 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 88.0ms TimeCoverageRelationStatistics Valid=33, Invalid=123, Unknown=0, NotChecked=0, Total=156 [2021-05-02 17:10:47,121 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2021-05-02 17:10:47,126 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 46. [2021-05-02 17:10:47,126 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 46 states, 28 states have (on average 1.1071428571428572) internal successors, (31), 30 states have internal predecessors, (31), 11 states have call successors, (11), 7 states have call predecessors, (11), 6 states have return successors, (9), 8 states have call predecessors, (9), 9 states have call successors, (9) [2021-05-02 17:10:47,126 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 51 transitions. [2021-05-02 17:10:47,127 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 51 transitions. Word has length 40 [2021-05-02 17:10:47,127 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:10:47,127 INFO L480 AbstractCegarLoop]: Abstraction has 46 states and 51 transitions. [2021-05-02 17:10:47,127 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 10 states, 9 states have (on average 2.2222222222222223) internal successors, (20), 8 states have internal predecessors, (20), 5 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (6), 5 states have call predecessors, (6), 5 states have call successors, (6) [2021-05-02 17:10:47,127 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 51 transitions. [2021-05-02 17:10:47,128 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2021-05-02 17:10:47,128 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:10:47,128 INFO L523 BasicCegarLoop]: trace histogram [4, 4, 4, 3, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:10:47,344 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:10:47,344 INFO L428 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:10:47,344 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:10:47,345 INFO L82 PathProgramCache]: Analyzing trace with hash 380668603, now seen corresponding path program 3 times [2021-05-02 17:10:47,345 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:10:47,345 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [28065255] [2021-05-02 17:10:47,345 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:10:47,353 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 17:10:47,353 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [872619394] [2021-05-02 17:10:47,353 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 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