/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/egcd-ll.c -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-c225d54 [2021-05-02 13:38:52,021 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-05-02 13:38:52,022 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-05-02 13:38:52,041 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2021-05-02 13:38:52,047 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-05-02 13:38:52,048 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-05-02 13:38:52,049 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-05-02 13:38:52,049 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-05-02 13:38:52,050 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-05-02 13:38:52,050 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-05-02 13:38:52,051 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-05-02 13:38:52,052 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-05-02 13:38:52,053 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-05-02 13:38:52,059 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-05-02 13:38:52,060 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-05-02 13:38:52,060 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-05-02 13:38:52,062 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2021-05-02 13:38:52,067 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-05-02 13:38:52,067 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-05-02 13:38:52,068 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-05-02 13:38:52,073 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 13:38:52,102 INFO L113 SettingsManager]: Loading preferences was successful [2021-05-02 13:38:52,102 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-05-02 13:38:52,103 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-05-02 13:38:52,103 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-05-02 13:38:52,103 INFO L138 SettingsManager]: * Use SBE=true [2021-05-02 13:38:52,103 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-05-02 13:38:52,104 INFO L138 SettingsManager]: * sizeof long=4 [2021-05-02 13:38:52,104 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-05-02 13:38:52,104 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-05-02 13:38:52,104 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-05-02 13:38:52,104 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-05-02 13:38:52,104 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-05-02 13:38:52,107 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-05-02 13:38:52,107 INFO L138 SettingsManager]: * sizeof long double=12 [2021-05-02 13:38:52,107 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-05-02 13:38:52,107 INFO L138 SettingsManager]: * Use constant arrays=true [2021-05-02 13:38:52,107 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-05-02 13:38:52,107 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-05-02 13:38:52,107 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-05-02 13:38:52,107 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-05-02 13:38:52,108 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-02 13:38:52,108 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-05-02 13:38:52,108 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-05-02 13:38:52,108 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-05-02 13:38:52,108 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-05-02 13:38:52,108 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-05-02 13:38:52,109 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-05-02 13:38:52,109 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-05-02 13:38:52,109 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2021-05-02 13:38:52,353 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-05-02 13:38:52,367 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-05-02 13:38:52,368 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-05-02 13:38:52,369 INFO L271 PluginConnector]: Initializing CDTParser... [2021-05-02 13:38:52,372 INFO L275 PluginConnector]: CDTParser initialized [2021-05-02 13:38:52,373 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/nla-digbench/egcd-ll.c [2021-05-02 13:38:52,429 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/fb116a612/09c51285bab0474e8f03d7bad212918d/FLAG463ce0dcc [2021-05-02 13:38:52,789 INFO L306 CDTParser]: Found 1 translation units. [2021-05-02 13:38:52,790 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/nla-digbench/egcd-ll.c [2021-05-02 13:38:52,796 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/fb116a612/09c51285bab0474e8f03d7bad212918d/FLAG463ce0dcc [2021-05-02 13:38:53,202 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/fb116a612/09c51285bab0474e8f03d7bad212918d [2021-05-02 13:38:53,204 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-05-02 13:38:53,205 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2021-05-02 13:38:53,206 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-05-02 13:38:53,207 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-05-02 13:38:53,209 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-05-02 13:38:53,210 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 01:38:53" (1/1) ... [2021-05-02 13:38:53,210 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@29c8964b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 01:38:53, skipping insertion in model container [2021-05-02 13:38:53,210 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 01:38:53" (1/1) ... [2021-05-02 13:38:53,215 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-05-02 13:38:53,229 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-05-02 13:38:53,309 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/egcd-ll.c[489,502] [2021-05-02 13:38:53,326 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 13:38:53,331 INFO L203 MainTranslator]: Completed pre-run [2021-05-02 13:38:53,338 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/egcd-ll.c[489,502] [2021-05-02 13:38:53,342 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 13:38:53,378 INFO L208 MainTranslator]: Completed translation [2021-05-02 13:38:53,379 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 01:38:53 WrapperNode [2021-05-02 13:38:53,379 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-05-02 13:38:53,380 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-05-02 13:38:53,380 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-05-02 13:38:53,381 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-05-02 13:38:53,387 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 01:38:53" (1/1) ... [2021-05-02 13:38:53,390 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 01:38:53" (1/1) ... [2021-05-02 13:38:53,396 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 01:38:53" (1/1) ... [2021-05-02 13:38:53,396 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 01:38:53" (1/1) ... [2021-05-02 13:38:53,407 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 01:38:53" (1/1) ... [2021-05-02 13:38:53,409 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 01:38:53" (1/1) ... [2021-05-02 13:38:53,412 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 01:38:53" (1/1) ... [2021-05-02 13:38:53,414 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-05-02 13:38:53,415 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-05-02 13:38:53,415 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-05-02 13:38:53,415 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-05-02 13:38:53,416 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 01:38:53" (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 13:38:53,469 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-05-02 13:38:53,470 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-05-02 13:38:53,470 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2021-05-02 13:38:53,470 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2021-05-02 13:38:53,470 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-05-02 13:38:53,470 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-05-02 13:38:53,470 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2021-05-02 13:38:53,470 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2021-05-02 13:38:53,470 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2021-05-02 13:38:53,470 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-05-02 13:38:53,470 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2021-05-02 13:38:53,470 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2021-05-02 13:38:53,470 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-05-02 13:38:53,470 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-05-02 13:38:53,470 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-05-02 13:38:53,471 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-05-02 13:38:53,471 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-05-02 13:38:53,471 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-05-02 13:38:53,471 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-05-02 13:38:53,471 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-05-02 13:38:53,681 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-05-02 13:38:53,681 INFO L299 CfgBuilder]: Removed 1 assume(true) statements. [2021-05-02 13:38:53,682 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 01:38:53 BoogieIcfgContainer [2021-05-02 13:38:53,682 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-05-02 13:38:53,683 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-05-02 13:38:53,683 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-05-02 13:38:53,701 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-05-02 13:38:53,701 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.05 01:38:53" (1/3) ... [2021-05-02 13:38:53,702 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3702df25 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 01:38:53, skipping insertion in model container [2021-05-02 13:38:53,702 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 01:38:53" (2/3) ... [2021-05-02 13:38:53,702 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3702df25 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 01:38:53, skipping insertion in model container [2021-05-02 13:38:53,702 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 01:38:53" (3/3) ... [2021-05-02 13:38:53,703 INFO L111 eAbstractionObserver]: Analyzing ICFG egcd-ll.c [2021-05-02 13:38:53,707 INFO L149 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-05-02 13:38:53,709 INFO L161 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-05-02 13:38:53,719 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-05-02 13:38:53,733 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-05-02 13:38:53,734 INFO L377 AbstractCegarLoop]: Hoare is true [2021-05-02 13:38:53,734 INFO L378 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-05-02 13:38:53,734 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-05-02 13:38:53,734 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-05-02 13:38:53,734 INFO L381 AbstractCegarLoop]: Difference is false [2021-05-02 13:38:53,734 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-05-02 13:38:53,734 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-05-02 13:38:53,744 INFO L276 IsEmpty]: Start isEmpty. Operand has 34 states, 17 states have (on average 1.411764705882353) internal successors, (24), 18 states have internal predecessors, (24), 11 states have call successors, (11), 4 states have call predecessors, (11), 4 states have return successors, (11), 11 states have call predecessors, (11), 11 states have call successors, (11) [2021-05-02 13:38:53,746 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-05-02 13:38:53,746 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:38:53,747 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 13:38:53,747 INFO L428 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:38:53,750 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:38:53,750 INFO L82 PathProgramCache]: Analyzing trace with hash -2012836591, now seen corresponding path program 1 times [2021-05-02 13:38:53,759 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:38:53,759 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [731323039] [2021-05-02 13:38:53,759 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:38:53,840 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:38:53,892 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:38:53,895 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:38:53,903 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-02 13:38:53,904 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:38:53,906 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2021-05-02 13:38:53,907 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:38:53,910 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 13:38:53,910 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:38:53,910 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [731323039] [2021-05-02 13:38:53,911 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [731323039] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 13:38:53,911 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 13:38:53,911 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-05-02 13:38:53,912 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [600581183] [2021-05-02 13:38:53,914 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-05-02 13:38:53,915 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:38:53,922 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-05-02 13:38:53,922 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-02 13:38:53,924 INFO L87 Difference]: Start difference. First operand has 34 states, 17 states have (on average 1.411764705882353) internal successors, (24), 18 states have internal predecessors, (24), 11 states have call successors, (11), 4 states have call predecessors, (11), 4 states have return successors, (11), 11 states have call predecessors, (11), 11 states have call successors, (11) 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 13:38:54,046 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:38:54,046 INFO L93 Difference]: Finished difference Result 61 states and 93 transitions. [2021-05-02 13:38:54,047 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-05-02 13:38:54,048 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 13:38:54,049 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:38:54,053 INFO L225 Difference]: With dead ends: 61 [2021-05-02 13:38:54,053 INFO L226 Difference]: Without dead ends: 29 [2021-05-02 13:38:54,056 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 23.2ms TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-02 13:38:54,067 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2021-05-02 13:38:54,094 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2021-05-02 13:38:54,096 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 29 states, 14 states have (on average 1.2142857142857142) internal successors, (17), 15 states have internal predecessors, (17), 11 states have call successors, (11), 4 states have call predecessors, (11), 3 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2021-05-02 13:38:54,099 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 37 transitions. [2021-05-02 13:38:54,100 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 37 transitions. Word has length 22 [2021-05-02 13:38:54,100 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:38:54,100 INFO L480 AbstractCegarLoop]: Abstraction has 29 states and 37 transitions. [2021-05-02 13:38:54,100 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 13:38:54,100 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 37 transitions. [2021-05-02 13:38:54,101 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-05-02 13:38:54,101 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:38:54,102 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 13:38:54,102 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-05-02 13:38:54,102 INFO L428 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:38:54,103 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:38:54,103 INFO L82 PathProgramCache]: Analyzing trace with hash 1952740121, now seen corresponding path program 1 times [2021-05-02 13:38:54,103 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:38:54,104 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1880547407] [2021-05-02 13:38:54,104 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:38:54,123 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 13:38:54,123 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1473818548] [2021-05-02 13:38:54,123 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 13:38:54,174 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:38:54,176 INFO L263 TraceCheckSpWp]: Trace formula consists of 121 conjuncts, 17 conjunts are in the unsatisfiable core [2021-05-02 13:38:54,179 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:38:54,218 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:38:54,260 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 13:38:54,261 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:38:54,261 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1880547407] [2021-05-02 13:38:54,261 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 13:38:54,261 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1473818548] [2021-05-02 13:38:54,261 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1473818548] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:38:54,261 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 13:38:54,261 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2021-05-02 13:38:54,262 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [45665290] [2021-05-02 13:38:54,262 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-05-02 13:38:54,262 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:38:54,263 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-05-02 13:38:54,263 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-05-02 13:38:54,263 INFO L87 Difference]: Start difference. First operand 29 states and 37 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 13:38:54,322 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:38:54,323 INFO L93 Difference]: Finished difference Result 45 states and 60 transitions. [2021-05-02 13:38:54,323 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-05-02 13:38:54,323 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 13:38:54,323 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:38:54,324 INFO L225 Difference]: With dead ends: 45 [2021-05-02 13:38:54,324 INFO L226 Difference]: Without dead ends: 43 [2021-05-02 13:38:54,325 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 16 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 29.8ms TimeCoverageRelationStatistics Valid=19, Invalid=53, Unknown=0, NotChecked=0, Total=72 [2021-05-02 13:38:54,325 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2021-05-02 13:38:54,332 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 42. [2021-05-02 13:38:54,332 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 42 states, 20 states have (on average 1.25) internal successors, (25), 22 states have internal predecessors, (25), 17 states have call successors, (17), 5 states have call predecessors, (17), 4 states have return successors, (15), 14 states have call predecessors, (15), 15 states have call successors, (15) [2021-05-02 13:38:54,333 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 57 transitions. [2021-05-02 13:38:54,334 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 57 transitions. Word has length 22 [2021-05-02 13:38:54,334 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:38:54,334 INFO L480 AbstractCegarLoop]: Abstraction has 42 states and 57 transitions. [2021-05-02 13:38:54,334 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 13:38:54,334 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 57 transitions. [2021-05-02 13:38:54,335 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2021-05-02 13:38:54,335 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:38:54,335 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:38:54,548 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1 [2021-05-02 13:38:54,550 INFO L428 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:38:54,550 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:38:54,550 INFO L82 PathProgramCache]: Analyzing trace with hash 652987931, now seen corresponding path program 1 times [2021-05-02 13:38:54,551 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:38:54,551 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [736193632] [2021-05-02 13:38:54,551 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:38:54,561 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 13:38:54,561 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [554719072] [2021-05-02 13:38:54,561 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 13:38:54,608 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:38:54,609 INFO L263 TraceCheckSpWp]: Trace formula consists of 130 conjuncts, 22 conjunts are in the unsatisfiable core [2021-05-02 13:38:54,612 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:38:54,657 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:38:54,658 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:38:54,696 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:38:54,698 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:38:54,700 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:38:54,701 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:38:54,719 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:38:54,721 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:38:54,727 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:38:54,727 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:38:54,747 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 13:38:54,747 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:38:54,747 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [736193632] [2021-05-02 13:38:54,747 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 13:38:54,747 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [554719072] [2021-05-02 13:38:54,747 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [554719072] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 13:38:54,748 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 13:38:54,748 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2021-05-02 13:38:54,748 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1540675401] [2021-05-02 13:38:54,749 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-02 13:38:54,749 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:38:54,749 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-02 13:38:54,749 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=54, Unknown=0, NotChecked=0, Total=72 [2021-05-02 13:38:54,750 INFO L87 Difference]: Start difference. First operand 42 states and 57 transitions. Second operand has 9 states, 8 states have (on average 1.75) internal successors, (14), 6 states have internal predecessors, (14), 3 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (4), 4 states have call predecessors, (4), 3 states have call successors, (4) [2021-05-02 13:38:54,848 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:38:54,849 INFO L93 Difference]: Finished difference Result 67 states and 97 transitions. [2021-05-02 13:38:54,849 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-02 13:38:54,849 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 8 states have (on average 1.75) internal successors, (14), 6 states have internal predecessors, (14), 3 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (4), 4 states have call predecessors, (4), 3 states have call successors, (4) Word has length 27 [2021-05-02 13:38:54,849 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:38:54,851 INFO L225 Difference]: With dead ends: 67 [2021-05-02 13:38:54,851 INFO L226 Difference]: Without dead ends: 65 [2021-05-02 13:38:54,852 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 19 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 42.4ms TimeCoverageRelationStatistics Valid=26, Invalid=84, Unknown=0, NotChecked=0, Total=110 [2021-05-02 13:38:54,852 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2021-05-02 13:38:54,861 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 58. [2021-05-02 13:38:54,861 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 58 states, 29 states have (on average 1.3103448275862069) internal successors, (38), 31 states have internal predecessors, (38), 23 states have call successors, (23), 6 states have call predecessors, (23), 5 states have return successors, (21), 20 states have call predecessors, (21), 21 states have call successors, (21) [2021-05-02 13:38:54,862 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 82 transitions. [2021-05-02 13:38:54,862 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 82 transitions. Word has length 27 [2021-05-02 13:38:54,862 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:38:54,863 INFO L480 AbstractCegarLoop]: Abstraction has 58 states and 82 transitions. [2021-05-02 13:38:54,863 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 9 states, 8 states have (on average 1.75) internal successors, (14), 6 states have internal predecessors, (14), 3 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (4), 4 states have call predecessors, (4), 3 states have call successors, (4) [2021-05-02 13:38:54,863 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 82 transitions. [2021-05-02 13:38:54,863 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2021-05-02 13:38:54,863 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:38:54,863 INFO L523 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:38:55,077 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:38:55,077 INFO L428 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:38:55,077 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:38:55,078 INFO L82 PathProgramCache]: Analyzing trace with hash 1028398105, now seen corresponding path program 1 times [2021-05-02 13:38:55,078 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:38:55,078 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1451164308] [2021-05-02 13:38:55,078 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:38:55,090 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 13:38:55,091 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1804343380] [2021-05-02 13:38:55,091 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 13:38:55,137 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:38:55,138 INFO L263 TraceCheckSpWp]: Trace formula consists of 139 conjuncts, 22 conjunts are in the unsatisfiable core [2021-05-02 13:38:55,139 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:38:55,160 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:38:55,161 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:38:55,188 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:38:55,190 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:38:55,191 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:38:55,191 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:38:55,200 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:38:55,201 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:38:55,202 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:38:55,203 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:38:55,235 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:38:55,236 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:38:55,238 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:38:55,238 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:38:55,256 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-05-02 13:38:55,256 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:38:55,256 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1451164308] [2021-05-02 13:38:55,256 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 13:38:55,256 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1804343380] [2021-05-02 13:38:55,257 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1804343380] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 13:38:55,257 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 13:38:55,257 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2021-05-02 13:38:55,257 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [489138779] [2021-05-02 13:38:55,258 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-02 13:38:55,258 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:38:55,259 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-02 13:38:55,259 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=54, Unknown=0, NotChecked=0, Total=72 [2021-05-02 13:38:55,259 INFO L87 Difference]: Start difference. First operand 58 states and 82 transitions. Second operand has 9 states, 8 states have (on average 1.75) internal successors, (14), 6 states have internal predecessors, (14), 3 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (5), 4 states have call predecessors, (5), 3 states have call successors, (5) [2021-05-02 13:38:55,352 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:38:55,353 INFO L93 Difference]: Finished difference Result 65 states and 88 transitions. [2021-05-02 13:38:55,353 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-02 13:38:55,353 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 8 states have (on average 1.75) internal successors, (14), 6 states have internal predecessors, (14), 3 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (5), 4 states have call predecessors, (5), 3 states have call successors, (5) Word has length 32 [2021-05-02 13:38:55,354 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:38:55,355 INFO L225 Difference]: With dead ends: 65 [2021-05-02 13:38:55,355 INFO L226 Difference]: Without dead ends: 61 [2021-05-02 13:38:55,355 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 24 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 41.3ms TimeCoverageRelationStatistics Valid=26, Invalid=84, Unknown=0, NotChecked=0, Total=110 [2021-05-02 13:38:55,355 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2021-05-02 13:38:55,363 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 61. [2021-05-02 13:38:55,363 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 61 states, 32 states have (on average 1.28125) internal successors, (41), 34 states have internal predecessors, (41), 22 states have call successors, (22), 7 states have call predecessors, (22), 6 states have return successors, (19), 19 states have call predecessors, (19), 19 states have call successors, (19) [2021-05-02 13:38:55,364 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 82 transitions. [2021-05-02 13:38:55,364 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 82 transitions. Word has length 32 [2021-05-02 13:38:55,364 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:38:55,364 INFO L480 AbstractCegarLoop]: Abstraction has 61 states and 82 transitions. [2021-05-02 13:38:55,364 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 9 states, 8 states have (on average 1.75) internal successors, (14), 6 states have internal predecessors, (14), 3 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (5), 4 states have call predecessors, (5), 3 states have call successors, (5) [2021-05-02 13:38:55,365 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 82 transitions. [2021-05-02 13:38:55,365 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2021-05-02 13:38:55,365 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:38:55,365 INFO L523 BasicCegarLoop]: trace histogram [4, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:38:55,573 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:38:55,573 INFO L428 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:38:55,574 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:38:55,574 INFO L82 PathProgramCache]: Analyzing trace with hash -134474469, now seen corresponding path program 1 times [2021-05-02 13:38:55,574 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:38:55,574 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [342233799] [2021-05-02 13:38:55,574 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:38:55,584 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 13:38:55,584 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [281110442] [2021-05-02 13:38:55,584 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 13:38:55,631 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:38:55,632 INFO L263 TraceCheckSpWp]: Trace formula consists of 150 conjuncts, 8 conjunts are in the unsatisfiable core [2021-05-02 13:38:55,633 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:38:55,684 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-05-02 13:38:55,685 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:38:55,685 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [342233799] [2021-05-02 13:38:55,685 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 13:38:55,685 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [281110442] [2021-05-02 13:38:55,685 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [281110442] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 13:38:55,685 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 13:38:55,685 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-05-02 13:38:55,685 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [994587960] [2021-05-02 13:38:55,685 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-05-02 13:38:55,685 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:38:55,686 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-05-02 13:38:55,686 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-05-02 13:38:55,686 INFO L87 Difference]: Start difference. First operand 61 states and 82 transitions. Second operand has 5 states, 4 states have (on average 3.75) internal successors, (15), 4 states have internal predecessors, (15), 2 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (6), 1 states have call predecessors, (6), 1 states have call successors, (6) [2021-05-02 13:38:55,711 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:38:55,711 INFO L93 Difference]: Finished difference Result 67 states and 87 transitions. [2021-05-02 13:38:55,711 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-05-02 13:38:55,711 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 3.75) internal successors, (15), 4 states have internal predecessors, (15), 2 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (6), 1 states have call predecessors, (6), 1 states have call successors, (6) Word has length 38 [2021-05-02 13:38:55,711 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:38:55,712 INFO L225 Difference]: With dead ends: 67 [2021-05-02 13:38:55,712 INFO L226 Difference]: Without dead ends: 65 [2021-05-02 13:38:55,712 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 34 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 9.9ms TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-05-02 13:38:55,713 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2021-05-02 13:38:55,719 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 65. [2021-05-02 13:38:55,719 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 65 states, 35 states have (on average 1.2571428571428571) internal successors, (44), 37 states have internal predecessors, (44), 22 states have call successors, (22), 8 states have call predecessors, (22), 7 states have return successors, (19), 19 states have call predecessors, (19), 19 states have call successors, (19) [2021-05-02 13:38:55,720 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 85 transitions. [2021-05-02 13:38:55,720 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 85 transitions. Word has length 38 [2021-05-02 13:38:55,720 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:38:55,720 INFO L480 AbstractCegarLoop]: Abstraction has 65 states and 85 transitions. [2021-05-02 13:38:55,720 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 5 states, 4 states have (on average 3.75) internal successors, (15), 4 states have internal predecessors, (15), 2 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (6), 1 states have call predecessors, (6), 1 states have call successors, (6) [2021-05-02 13:38:55,720 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 85 transitions. [2021-05-02 13:38:55,721 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2021-05-02 13:38:55,721 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:38:55,721 INFO L523 BasicCegarLoop]: trace histogram [4, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:38:55,941 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:38:55,941 INFO L428 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:38:55,941 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:38:55,942 INFO L82 PathProgramCache]: Analyzing trace with hash 308355254, now seen corresponding path program 1 times [2021-05-02 13:38:55,942 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:38:55,942 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [182521855] [2021-05-02 13:38:55,942 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:38:55,953 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 13:38:55,953 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1999905271] [2021-05-02 13:38:55,953 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:38:56,001 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:38:56,002 INFO L263 TraceCheckSpWp]: Trace formula consists of 157 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-02 13:38:56,004 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:38:56,026 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:38:56,104 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-05-02 13:38:56,104 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:38:56,104 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [182521855] [2021-05-02 13:38:56,105 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 13:38:56,105 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1999905271] [2021-05-02 13:38:56,105 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1999905271] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:38:56,105 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 13:38:56,105 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2021-05-02 13:38:56,105 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2017365873] [2021-05-02 13:38:56,105 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-05-02 13:38:56,105 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:38:56,106 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-05-02 13:38:56,106 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-05-02 13:38:56,107 INFO L87 Difference]: Start difference. First operand 65 states and 85 transitions. Second operand has 7 states, 7 states have (on average 2.7142857142857144) internal successors, (19), 6 states have internal predecessors, (19), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) [2021-05-02 13:38:56,176 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:38:56,176 INFO L93 Difference]: Finished difference Result 81 states and 103 transitions. [2021-05-02 13:38:56,177 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-05-02 13:38:56,177 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 2.7142857142857144) internal successors, (19), 6 states have internal predecessors, (19), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) Word has length 40 [2021-05-02 13:38:56,177 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:38:56,179 INFO L225 Difference]: With dead ends: 81 [2021-05-02 13:38:56,179 INFO L226 Difference]: Without dead ends: 79 [2021-05-02 13:38:56,179 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 33 SyntacticMatches, 1 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 29.8ms TimeCoverageRelationStatistics Valid=19, Invalid=53, Unknown=0, NotChecked=0, Total=72 [2021-05-02 13:38:56,180 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 79 states. [2021-05-02 13:38:56,199 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 79 to 76. [2021-05-02 13:38:56,199 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 76 states, 41 states have (on average 1.2195121951219512) internal successors, (50), 44 states have internal predecessors, (50), 25 states have call successors, (25), 10 states have call predecessors, (25), 9 states have return successors, (22), 21 states have call predecessors, (22), 22 states have call successors, (22) [2021-05-02 13:38:56,202 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 97 transitions. [2021-05-02 13:38:56,202 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 97 transitions. Word has length 40 [2021-05-02 13:38:56,203 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:38:56,203 INFO L480 AbstractCegarLoop]: Abstraction has 76 states and 97 transitions. [2021-05-02 13:38:56,203 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 7 states, 7 states have (on average 2.7142857142857144) internal successors, (19), 6 states have internal predecessors, (19), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) [2021-05-02 13:38:56,203 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 97 transitions. [2021-05-02 13:38:56,207 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2021-05-02 13:38:56,207 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:38:56,208 INFO L523 BasicCegarLoop]: trace histogram [5, 4, 4, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:38:56,408 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2021-05-02 13:38:56,408 INFO L428 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:38:56,409 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:38:56,409 INFO L82 PathProgramCache]: Analyzing trace with hash -1098226535, now seen corresponding path program 1 times [2021-05-02 13:38:56,409 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:38:56,409 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [849237917] [2021-05-02 13:38:56,409 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:38:56,417 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 13:38:56,417 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [288320336] [2021-05-02 13:38:56,417 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 13:38:56,472 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:38:56,473 INFO L263 TraceCheckSpWp]: Trace formula consists of 159 conjuncts, 18 conjunts are in the unsatisfiable core [2021-05-02 13:38:56,482 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:38:56,571 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:38:56,573 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:38:56,598 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 15 proven. 5 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-05-02 13:38:56,599 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:38:56,599 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [849237917] [2021-05-02 13:38:56,599 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 13:38:56,599 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [288320336] [2021-05-02 13:38:56,599 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [288320336] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:38:56,599 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 13:38:56,599 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2021-05-02 13:38:56,599 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [32929172] [2021-05-02 13:38:56,599 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-02 13:38:56,600 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:38:56,600 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-02 13:38:56,600 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=54, Unknown=0, NotChecked=0, Total=72 [2021-05-02 13:38:56,600 INFO L87 Difference]: Start difference. First operand 76 states and 97 transitions. Second operand has 9 states, 7 states have (on average 2.5714285714285716) internal successors, (18), 6 states have internal predecessors, (18), 4 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (7), 3 states have call predecessors, (7), 3 states have call successors, (7) [2021-05-02 13:38:56,701 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:38:56,702 INFO L93 Difference]: Finished difference Result 85 states and 107 transitions. [2021-05-02 13:38:56,702 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-02 13:38:56,702 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 7 states have (on average 2.5714285714285716) internal successors, (18), 6 states have internal predecessors, (18), 4 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (7), 3 states have call predecessors, (7), 3 states have call successors, (7) Word has length 43 [2021-05-02 13:38:56,702 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:38:56,703 INFO L225 Difference]: With dead ends: 85 [2021-05-02 13:38:56,703 INFO L226 Difference]: Without dead ends: 81 [2021-05-02 13:38:56,703 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 35 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 51.8ms TimeCoverageRelationStatistics Valid=29, Invalid=81, Unknown=0, NotChecked=0, Total=110 [2021-05-02 13:38:56,704 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 81 states. [2021-05-02 13:38:56,712 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 81 to 81. [2021-05-02 13:38:56,713 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 81 states, 45 states have (on average 1.1555555555555554) internal successors, (52), 48 states have internal predecessors, (52), 25 states have call successors, (25), 11 states have call predecessors, (25), 10 states have return successors, (23), 21 states have call predecessors, (23), 23 states have call successors, (23) [2021-05-02 13:38:56,713 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 81 states to 81 states and 100 transitions. [2021-05-02 13:38:56,713 INFO L78 Accepts]: Start accepts. Automaton has 81 states and 100 transitions. Word has length 43 [2021-05-02 13:38:56,713 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:38:56,713 INFO L480 AbstractCegarLoop]: Abstraction has 81 states and 100 transitions. [2021-05-02 13:38:56,714 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 9 states, 7 states have (on average 2.5714285714285716) internal successors, (18), 6 states have internal predecessors, (18), 4 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (7), 3 states have call predecessors, (7), 3 states have call successors, (7) [2021-05-02 13:38:56,714 INFO L276 IsEmpty]: Start isEmpty. Operand 81 states and 100 transitions. [2021-05-02 13:38:56,714 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2021-05-02 13:38:56,714 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:38:56,714 INFO L523 BasicCegarLoop]: trace histogram [5, 4, 4, 2, 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 13:38:56,921 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:38:56,921 INFO L428 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:38:56,921 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:38:56,921 INFO L82 PathProgramCache]: Analyzing trace with hash -17648356, now seen corresponding path program 1 times [2021-05-02 13:38:56,921 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:38:56,922 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [719179509] [2021-05-02 13:38:56,922 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:38:56,929 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 13:38:56,929 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [355828133] [2021-05-02 13:38:56,929 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:38:56,983 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:38:56,984 INFO L263 TraceCheckSpWp]: Trace formula consists of 166 conjuncts, 43 conjunts are in the unsatisfiable core [2021-05-02 13:38:56,987 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:38:57,016 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:38:57,017 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:38:57,054 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:38:57,055 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:38:57,056 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:38:57,057 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:38:57,064 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:38:57,065 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:38:57,066 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:38:57,066 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:38:57,091 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:38:57,092 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:38:57,093 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:38:57,094 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:38:57,121 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:38:57,122 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:38:57,137 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:38:57,139 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:38:57,157 INFO L134 CoverageAnalysis]: Checked inductivity of 39 backedges. 10 proven. 10 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2021-05-02 13:38:57,157 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:38:57,157 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [719179509] [2021-05-02 13:38:57,157 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 13:38:57,157 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [355828133] [2021-05-02 13:38:57,157 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [355828133] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:38:57,158 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 13:38:57,158 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2021-05-02 13:38:57,158 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [149166472] [2021-05-02 13:38:57,158 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2021-05-02 13:38:57,158 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:38:57,158 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-05-02 13:38:57,159 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=105, Unknown=0, NotChecked=0, Total=132 [2021-05-02 13:38:57,159 INFO L87 Difference]: Start difference. First operand 81 states and 100 transitions. Second operand has 12 states, 11 states have (on average 1.8181818181818181) internal successors, (20), 9 states have internal predecessors, (20), 4 states have call successors, (9), 2 states have call predecessors, (9), 3 states have return successors, (7), 5 states have call predecessors, (7), 4 states have call successors, (7) [2021-05-02 13:38:57,389 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:38:57,389 INFO L93 Difference]: Finished difference Result 115 states and 142 transitions. [2021-05-02 13:38:57,389 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-05-02 13:38:57,390 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 11 states have (on average 1.8181818181818181) internal successors, (20), 9 states have internal predecessors, (20), 4 states have call successors, (9), 2 states have call predecessors, (9), 3 states have return successors, (7), 5 states have call predecessors, (7), 4 states have call successors, (7) Word has length 45 [2021-05-02 13:38:57,392 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:38:57,394 INFO L225 Difference]: With dead ends: 115 [2021-05-02 13:38:57,394 INFO L226 Difference]: Without dead ends: 113 [2021-05-02 13:38:57,394 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 33 SyntacticMatches, 1 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 76.3ms TimeCoverageRelationStatistics Valid=42, Invalid=168, Unknown=0, NotChecked=0, Total=210 [2021-05-02 13:38:57,395 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 113 states. [2021-05-02 13:38:57,416 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 113 to 109. [2021-05-02 13:38:57,416 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 109 states, 63 states have (on average 1.1587301587301588) internal successors, (73), 66 states have internal predecessors, (73), 31 states have call successors, (31), 15 states have call predecessors, (31), 14 states have return successors, (29), 27 states have call predecessors, (29), 29 states have call successors, (29) [2021-05-02 13:38:57,417 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 109 states to 109 states and 133 transitions. [2021-05-02 13:38:57,417 INFO L78 Accepts]: Start accepts. Automaton has 109 states and 133 transitions. Word has length 45 [2021-05-02 13:38:57,417 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:38:57,417 INFO L480 AbstractCegarLoop]: Abstraction has 109 states and 133 transitions. [2021-05-02 13:38:57,418 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 12 states, 11 states have (on average 1.8181818181818181) internal successors, (20), 9 states have internal predecessors, (20), 4 states have call successors, (9), 2 states have call predecessors, (9), 3 states have return successors, (7), 5 states have call predecessors, (7), 4 states have call successors, (7) [2021-05-02 13:38:57,418 INFO L276 IsEmpty]: Start isEmpty. Operand 109 states and 133 transitions. [2021-05-02 13:38:57,418 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2021-05-02 13:38:57,418 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:38:57,419 INFO L523 BasicCegarLoop]: trace histogram [6, 5, 5, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:38:57,633 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:38:57,633 INFO L428 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:38:57,633 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:38:57,634 INFO L82 PathProgramCache]: Analyzing trace with hash 1834363254, now seen corresponding path program 2 times [2021-05-02 13:38:57,634 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:38:57,634 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1285479447] [2021-05-02 13:38:57,634 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:38:57,643 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 13:38:57,643 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1293459685] [2021-05-02 13:38:57,643 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 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:38:57,694 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 13:38:57,694 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:38:57,695 INFO L263 TraceCheckSpWp]: Trace formula consists of 175 conjuncts, 45 conjunts are in the unsatisfiable core [2021-05-02 13:38:57,699 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:38:57,728 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:38:57,730 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:38:57,783 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:38:57,785 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:38:57,793 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:38:57,793 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:38:57,808 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:38:57,809 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:38:57,856 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:38:57,857 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:38:57,865 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:38:57,866 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:38:57,884 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:38:57,885 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:38:57,899 INFO L134 CoverageAnalysis]: Checked inductivity of 58 backedges. 23 proven. 12 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2021-05-02 13:38:57,899 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:38:57,899 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1285479447] [2021-05-02 13:38:57,899 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 13:38:57,899 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1293459685] [2021-05-02 13:38:57,899 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1293459685] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:38:57,899 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 13:38:57,899 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2021-05-02 13:38:57,899 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [454074261] [2021-05-02 13:38:57,900 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2021-05-02 13:38:57,900 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:38:57,900 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-05-02 13:38:57,900 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=106, Unknown=0, NotChecked=0, Total=132 [2021-05-02 13:38:57,900 INFO L87 Difference]: Start difference. First operand 109 states and 133 transitions. Second operand has 12 states, 11 states have (on average 2.090909090909091) internal successors, (23), 9 states have internal predecessors, (23), 5 states have call successors, (10), 2 states have call predecessors, (10), 3 states have return successors, (8), 5 states have call predecessors, (8), 4 states have call successors, (8) [2021-05-02 13:38:58,104 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:38:58,104 INFO L93 Difference]: Finished difference Result 143 states and 180 transitions. [2021-05-02 13:38:58,105 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-05-02 13:38:58,105 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 11 states have (on average 2.090909090909091) internal successors, (23), 9 states have internal predecessors, (23), 5 states have call successors, (10), 2 states have call predecessors, (10), 3 states have return successors, (8), 5 states have call predecessors, (8), 4 states have call successors, (8) Word has length 50 [2021-05-02 13:38:58,105 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:38:58,108 INFO L225 Difference]: With dead ends: 143 [2021-05-02 13:38:58,108 INFO L226 Difference]: Without dead ends: 136 [2021-05-02 13:38:58,108 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 38 SyntacticMatches, 1 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 89.4ms TimeCoverageRelationStatistics Valid=41, Invalid=169, Unknown=0, NotChecked=0, Total=210 [2021-05-02 13:38:58,109 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 136 states. [2021-05-02 13:38:58,119 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 136 to 136. [2021-05-02 13:38:58,120 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 136 states, 78 states have (on average 1.1666666666666667) internal successors, (91), 82 states have internal predecessors, (91), 40 states have call successors, (40), 18 states have call predecessors, (40), 17 states have return successors, (37), 35 states have call predecessors, (37), 37 states have call successors, (37) [2021-05-02 13:38:58,121 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 136 states to 136 states and 168 transitions. [2021-05-02 13:38:58,121 INFO L78 Accepts]: Start accepts. Automaton has 136 states and 168 transitions. Word has length 50 [2021-05-02 13:38:58,121 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:38:58,121 INFO L480 AbstractCegarLoop]: Abstraction has 136 states and 168 transitions. [2021-05-02 13:38:58,121 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 12 states, 11 states have (on average 2.090909090909091) internal successors, (23), 9 states have internal predecessors, (23), 5 states have call successors, (10), 2 states have call predecessors, (10), 3 states have return successors, (8), 5 states have call predecessors, (8), 4 states have call successors, (8) [2021-05-02 13:38:58,121 INFO L276 IsEmpty]: Start isEmpty. Operand 136 states and 168 transitions. [2021-05-02 13:38:58,122 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2021-05-02 13:38:58,122 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:38:58,122 INFO L523 BasicCegarLoop]: trace histogram [7, 6, 6, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:38:58,322 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable8 [2021-05-02 13:38:58,323 INFO L428 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:38:58,323 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:38:58,323 INFO L82 PathProgramCache]: Analyzing trace with hash -152607915, now seen corresponding path program 1 times [2021-05-02 13:38:58,323 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:38:58,323 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [288336278] [2021-05-02 13:38:58,323 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:38:58,330 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 13:38:58,330 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2146326663] [2021-05-02 13:38:58,330 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:38:58,369 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:38:58,369 INFO L263 TraceCheckSpWp]: Trace formula consists of 193 conjuncts, 31 conjunts are in the unsatisfiable core [2021-05-02 13:38:58,371 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:38:58,389 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:38:58,390 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:38:58,398 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:38:58,436 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:38:58,443 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:38:58,457 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:38:58,458 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:38:58,466 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:38:58,467 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:38:58,473 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:38:58,474 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:38:58,484 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:38:58,488 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:38:58,515 INFO L134 CoverageAnalysis]: Checked inductivity of 86 backedges. 12 proven. 13 refuted. 0 times theorem prover too weak. 61 trivial. 0 not checked. [2021-05-02 13:38:58,516 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:38:58,516 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [288336278] [2021-05-02 13:38:58,516 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 13:38:58,516 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2146326663] [2021-05-02 13:38:58,516 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2146326663] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:38:58,516 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 13:38:58,516 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2021-05-02 13:38:58,516 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [962545268] [2021-05-02 13:38:58,517 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-05-02 13:38:58,517 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:38:58,517 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-05-02 13:38:58,517 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=73, Unknown=0, NotChecked=0, Total=90 [2021-05-02 13:38:58,517 INFO L87 Difference]: Start difference. First operand 136 states and 168 transitions. Second operand has 10 states, 10 states have (on average 2.3) internal successors, (23), 8 states have internal predecessors, (23), 5 states have call successors, (11), 2 states have call predecessors, (11), 2 states have return successors, (9), 4 states have call predecessors, (9), 4 states have call successors, (9) [2021-05-02 13:38:58,697 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:38:58,697 INFO L93 Difference]: Finished difference Result 156 states and 194 transitions. [2021-05-02 13:38:58,697 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-02 13:38:58,698 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 2.3) internal successors, (23), 8 states have internal predecessors, (23), 5 states have call successors, (11), 2 states have call predecessors, (11), 2 states have return successors, (9), 4 states have call predecessors, (9), 4 states have call successors, (9) Word has length 58 [2021-05-02 13:38:58,698 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:38:58,699 INFO L225 Difference]: With dead ends: 156 [2021-05-02 13:38:58,699 INFO L226 Difference]: Without dead ends: 154 [2021-05-02 13:38:58,699 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 49 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 79.4ms TimeCoverageRelationStatistics Valid=37, Invalid=173, Unknown=0, NotChecked=0, Total=210 [2021-05-02 13:38:58,699 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 154 states. [2021-05-02 13:38:58,711 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 154 to 152. [2021-05-02 13:38:58,711 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 152 states, 86 states have (on average 1.1627906976744187) internal successors, (100), 91 states have internal predecessors, (100), 46 states have call successors, (46), 20 states have call predecessors, (46), 19 states have return successors, (43), 40 states have call predecessors, (43), 43 states have call successors, (43) [2021-05-02 13:38:58,712 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 152 states to 152 states and 189 transitions. [2021-05-02 13:38:58,712 INFO L78 Accepts]: Start accepts. Automaton has 152 states and 189 transitions. Word has length 58 [2021-05-02 13:38:58,712 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:38:58,712 INFO L480 AbstractCegarLoop]: Abstraction has 152 states and 189 transitions. [2021-05-02 13:38:58,712 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 10 states, 10 states have (on average 2.3) internal successors, (23), 8 states have internal predecessors, (23), 5 states have call successors, (11), 2 states have call predecessors, (11), 2 states have return successors, (9), 4 states have call predecessors, (9), 4 states have call successors, (9) [2021-05-02 13:38:58,712 INFO L276 IsEmpty]: Start isEmpty. Operand 152 states and 189 transitions. [2021-05-02 13:38:58,713 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2021-05-02 13:38:58,713 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:38:58,713 INFO L523 BasicCegarLoop]: trace histogram [7, 6, 6, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:38:58,929 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,10 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:38:58,929 INFO L428 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:38:58,929 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:38:58,929 INFO L82 PathProgramCache]: Analyzing trace with hash -343879723, now seen corresponding path program 2 times [2021-05-02 13:38:58,930 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:38:58,930 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [844850120] [2021-05-02 13:38:58,930 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:38:58,936 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 13:38:58,936 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1837990075] [2021-05-02 13:38:58,936 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 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:38:58,977 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 13:38:58,977 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:38:58,978 INFO L263 TraceCheckSpWp]: Trace formula consists of 193 conjuncts, 32 conjunts are in the unsatisfiable core [2021-05-02 13:38:58,979 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:38:59,000 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:38:59,001 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:38:59,007 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:38:59,043 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:38:59,044 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:38:59,062 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:38:59,063 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:38:59,070 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:38:59,070 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:38:59,077 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:38:59,078 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:38:59,086 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:38:59,087 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:38:59,118 INFO L134 CoverageAnalysis]: Checked inductivity of 86 backedges. 12 proven. 13 refuted. 0 times theorem prover too weak. 61 trivial. 0 not checked. [2021-05-02 13:38:59,118 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:38:59,118 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [844850120] [2021-05-02 13:38:59,119 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 13:38:59,119 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1837990075] [2021-05-02 13:38:59,119 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1837990075] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:38:59,119 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 13:38:59,119 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2021-05-02 13:38:59,119 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [473417940] [2021-05-02 13:38:59,119 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-05-02 13:38:59,119 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:38:59,120 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-05-02 13:38:59,120 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=90, Unknown=0, NotChecked=0, Total=110 [2021-05-02 13:38:59,120 INFO L87 Difference]: Start difference. First operand 152 states and 189 transitions. Second operand has 11 states, 11 states have (on average 2.090909090909091) internal successors, (23), 9 states have internal predecessors, (23), 5 states have call successors, (11), 2 states have call predecessors, (11), 2 states have return successors, (9), 4 states have call predecessors, (9), 4 states have call successors, (9) [2021-05-02 13:38:59,297 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:38:59,297 INFO L93 Difference]: Finished difference Result 167 states and 210 transitions. [2021-05-02 13:38:59,297 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-02 13:38:59,297 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 2.090909090909091) internal successors, (23), 9 states have internal predecessors, (23), 5 states have call successors, (11), 2 states have call predecessors, (11), 2 states have return successors, (9), 4 states have call predecessors, (9), 4 states have call successors, (9) Word has length 58 [2021-05-02 13:38:59,297 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:38:59,298 INFO L225 Difference]: With dead ends: 167 [2021-05-02 13:38:59,298 INFO L226 Difference]: Without dead ends: 162 [2021-05-02 13:38:59,299 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 63 GetRequests, 48 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22 ImplicationChecksByTransitivity, 103.3ms TimeCoverageRelationStatistics Valid=46, Invalid=226, Unknown=0, NotChecked=0, Total=272 [2021-05-02 13:38:59,299 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 162 states. [2021-05-02 13:38:59,338 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 162 to 161. [2021-05-02 13:38:59,339 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 161 states, 91 states have (on average 1.1538461538461537) internal successors, (105), 96 states have internal predecessors, (105), 49 states have call successors, (49), 21 states have call predecessors, (49), 20 states have return successors, (46), 43 states have call predecessors, (46), 46 states have call successors, (46) [2021-05-02 13:38:59,340 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 161 states to 161 states and 200 transitions. [2021-05-02 13:38:59,340 INFO L78 Accepts]: Start accepts. Automaton has 161 states and 200 transitions. Word has length 58 [2021-05-02 13:38:59,340 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:38:59,340 INFO L480 AbstractCegarLoop]: Abstraction has 161 states and 200 transitions. [2021-05-02 13:38:59,340 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 11 states, 11 states have (on average 2.090909090909091) internal successors, (23), 9 states have internal predecessors, (23), 5 states have call successors, (11), 2 states have call predecessors, (11), 2 states have return successors, (9), 4 states have call predecessors, (9), 4 states have call successors, (9) [2021-05-02 13:38:59,340 INFO L276 IsEmpty]: Start isEmpty. Operand 161 states and 200 transitions. [2021-05-02 13:38:59,342 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2021-05-02 13:38:59,342 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:38:59,342 INFO L523 BasicCegarLoop]: trace histogram [8, 7, 7, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:38:59,549 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,11 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:38:59,550 INFO L428 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:38:59,550 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:38:59,551 INFO L82 PathProgramCache]: Analyzing trace with hash -1386725923, now seen corresponding path program 2 times [2021-05-02 13:38:59,551 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:38:59,551 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [594007775] [2021-05-02 13:38:59,551 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:38:59,557 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 13:38:59,557 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1956691084] [2021-05-02 13:38:59,558 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 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:38:59,606 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 13:38:59,606 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:38:59,607 INFO L263 TraceCheckSpWp]: Trace formula consists of 202 conjuncts, 41 conjunts are in the unsatisfiable core [2021-05-02 13:38:59,609 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:38:59,634 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:38:59,635 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:38:59,668 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:38:59,669 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:38:59,670 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:38:59,673 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:38:59,681 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:38:59,681 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:38:59,682 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:38:59,683 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:38:59,690 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:38:59,690 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:38:59,691 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:38:59,692 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:38:59,721 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:38:59,722 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:38:59,723 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:38:59,724 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:38:59,734 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:38:59,734 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:38:59,735 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:38:59,736 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:38:59,783 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:38:59,783 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:38:59,784 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:38:59,785 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:38:59,814 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:38:59,815 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:38:59,815 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:38:59,819 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:38:59,827 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:38:59,828 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:38:59,844 INFO L134 CoverageAnalysis]: Checked inductivity of 114 backedges. 25 proven. 19 refuted. 0 times theorem prover too weak. 70 trivial. 0 not checked. [2021-05-02 13:38:59,845 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:38:59,845 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [594007775] [2021-05-02 13:38:59,845 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 13:38:59,845 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1956691084] [2021-05-02 13:38:59,845 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1956691084] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:38:59,845 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 13:38:59,845 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14] total 14 [2021-05-02 13:38:59,845 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1661848005] [2021-05-02 13:38:59,846 INFO L460 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-02 13:38:59,846 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:38:59,846 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-02 13:38:59,846 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=146, Unknown=0, NotChecked=0, Total=182 [2021-05-02 13:38:59,846 INFO L87 Difference]: Start difference. First operand 161 states and 200 transitions. Second operand has 14 states, 13 states have (on average 1.7692307692307692) internal successors, (23), 11 states have internal predecessors, (23), 6 states have call successors, (12), 2 states have call predecessors, (12), 3 states have return successors, (10), 7 states have call predecessors, (10), 6 states have call successors, (10) [2021-05-02 13:39:00,092 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:39:00,093 INFO L93 Difference]: Finished difference Result 191 states and 239 transitions. [2021-05-02 13:39:00,093 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-05-02 13:39:00,093 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 13 states have (on average 1.7692307692307692) internal successors, (23), 11 states have internal predecessors, (23), 6 states have call successors, (12), 2 states have call predecessors, (12), 3 states have return successors, (10), 7 states have call predecessors, (10), 6 states have call successors, (10) Word has length 63 [2021-05-02 13:39:00,093 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:39:00,094 INFO L225 Difference]: With dead ends: 191 [2021-05-02 13:39:00,094 INFO L226 Difference]: Without dead ends: 189 [2021-05-02 13:39:00,095 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 50 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 36 ImplicationChecksByTransitivity, 109.9ms TimeCoverageRelationStatistics Valid=51, Invalid=221, Unknown=0, NotChecked=0, Total=272 [2021-05-02 13:39:00,095 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 189 states. [2021-05-02 13:39:00,107 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 189 to 185. [2021-05-02 13:39:00,107 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 185 states, 106 states have (on average 1.1603773584905661) internal successors, (123), 111 states have internal predecessors, (123), 55 states have call successors, (55), 24 states have call predecessors, (55), 23 states have return successors, (52), 49 states have call predecessors, (52), 52 states have call successors, (52) [2021-05-02 13:39:00,108 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 185 states to 185 states and 230 transitions. [2021-05-02 13:39:00,108 INFO L78 Accepts]: Start accepts. Automaton has 185 states and 230 transitions. Word has length 63 [2021-05-02 13:39:00,108 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:39:00,108 INFO L480 AbstractCegarLoop]: Abstraction has 185 states and 230 transitions. [2021-05-02 13:39:00,109 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 14 states, 13 states have (on average 1.7692307692307692) internal successors, (23), 11 states have internal predecessors, (23), 6 states have call successors, (12), 2 states have call predecessors, (12), 3 states have return successors, (10), 7 states have call predecessors, (10), 6 states have call successors, (10) [2021-05-02 13:39:00,109 INFO L276 IsEmpty]: Start isEmpty. Operand 185 states and 230 transitions. [2021-05-02 13:39:00,109 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2021-05-02 13:39:00,109 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:39:00,109 INFO L523 BasicCegarLoop]: trace histogram [8, 7, 7, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:39:00,324 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2021-05-02 13:39:00,325 INFO L428 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:39:00,325 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:39:00,325 INFO L82 PathProgramCache]: Analyzing trace with hash -522529, now seen corresponding path program 3 times [2021-05-02 13:39:00,325 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:39:00,325 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [90304605] [2021-05-02 13:39:00,325 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:39:00,331 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 13:39:00,331 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [347336462] [2021-05-02 13:39:00,332 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 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:39:00,378 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-05-02 13:39:00,378 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:39:00,379 INFO L263 TraceCheckSpWp]: Trace formula consists of 175 conjuncts, 42 conjunts are in the unsatisfiable core [2021-05-02 13:39:00,380 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:39:00,398 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:39:00,399 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:39:00,420 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:39:00,422 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:39:00,428 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:39:00,429 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:39:00,438 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:39:00,439 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:39:00,473 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:39:00,474 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:39:00,481 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:39:00,481 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:39:00,487 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:39:00,488 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:39:00,544 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:39:00,545 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:39:00,546 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:39:00,555 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:39:00,557 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:39:00,574 INFO L134 CoverageAnalysis]: Checked inductivity of 114 backedges. 28 proven. 19 refuted. 0 times theorem prover too weak. 67 trivial. 0 not checked. [2021-05-02 13:39:00,574 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:39:00,575 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [90304605] [2021-05-02 13:39:00,575 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 13:39:00,575 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [347336462] [2021-05-02 13:39:00,575 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [347336462] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:39:00,575 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 13:39:00,575 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2021-05-02 13:39:00,575 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1304753507] [2021-05-02 13:39:00,575 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2021-05-02 13:39:00,575 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:39:00,576 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-05-02 13:39:00,576 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=127, Unknown=0, NotChecked=0, Total=156 [2021-05-02 13:39:00,576 INFO L87 Difference]: Start difference. First operand 185 states and 230 transitions. Second operand has 13 states, 13 states have (on average 2.0) internal successors, (26), 11 states have internal predecessors, (26), 5 states have call successors, (12), 2 states have call predecessors, (12), 3 states have return successors, (10), 6 states have call predecessors, (10), 5 states have call successors, (10) [2021-05-02 13:39:00,781 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:39:00,781 INFO L93 Difference]: Finished difference Result 210 states and 261 transitions. [2021-05-02 13:39:00,782 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-05-02 13:39:00,782 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 2.0) internal successors, (26), 11 states have internal predecessors, (26), 5 states have call successors, (12), 2 states have call predecessors, (12), 3 states have return successors, (10), 6 states have call predecessors, (10), 5 states have call successors, (10) Word has length 63 [2021-05-02 13:39:00,782 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:39:00,783 INFO L225 Difference]: With dead ends: 210 [2021-05-02 13:39:00,783 INFO L226 Difference]: Without dead ends: 208 [2021-05-02 13:39:00,783 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 51 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 29 ImplicationChecksByTransitivity, 104.9ms TimeCoverageRelationStatistics Valid=44, Invalid=196, Unknown=0, NotChecked=0, Total=240 [2021-05-02 13:39:00,784 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 208 states. [2021-05-02 13:39:00,796 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 208 to 194. [2021-05-02 13:39:00,796 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 194 states, 113 states have (on average 1.1592920353982301) internal successors, (131), 118 states have internal predecessors, (131), 55 states have call successors, (55), 26 states have call predecessors, (55), 25 states have return successors, (52), 49 states have call predecessors, (52), 52 states have call successors, (52) [2021-05-02 13:39:00,797 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 194 states to 194 states and 238 transitions. [2021-05-02 13:39:00,797 INFO L78 Accepts]: Start accepts. Automaton has 194 states and 238 transitions. Word has length 63 [2021-05-02 13:39:00,798 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:39:00,798 INFO L480 AbstractCegarLoop]: Abstraction has 194 states and 238 transitions. [2021-05-02 13:39:00,798 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 13 states, 13 states have (on average 2.0) internal successors, (26), 11 states have internal predecessors, (26), 5 states have call successors, (12), 2 states have call predecessors, (12), 3 states have return successors, (10), 6 states have call predecessors, (10), 5 states have call successors, (10) [2021-05-02 13:39:00,798 INFO L276 IsEmpty]: Start isEmpty. Operand 194 states and 238 transitions. [2021-05-02 13:39:00,798 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2021-05-02 13:39:00,799 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:39:00,799 INFO L523 BasicCegarLoop]: trace histogram [9, 8, 8, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:39:01,001 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2021-05-02 13:39:01,002 INFO L428 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:39:01,002 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:39:01,002 INFO L82 PathProgramCache]: Analyzing trace with hash 1383919957, now seen corresponding path program 4 times [2021-05-02 13:39:01,002 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:39:01,002 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1721782201] [2021-05-02 13:39:01,002 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:39:01,008 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 13:39:01,008 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [31674671] [2021-05-02 13:39:01,008 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:39:01,055 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 13:39:01,056 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:39:01,056 INFO L263 TraceCheckSpWp]: Trace formula consists of 174 conjuncts, 49 conjunts are in the unsatisfiable core [2021-05-02 13:39:01,058 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:39:01,074 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:39:01,075 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:39:01,092 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:39:01,105 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:39:01,111 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:39:01,112 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:39:01,131 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:39:01,131 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:39:01,158 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:39:01,160 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:39:01,167 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:39:01,168 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:39:01,175 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:39:01,176 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:39:01,218 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:39:01,219 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:39:01,227 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:39:01,228 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:39:01,257 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:39:01,258 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:39:01,294 INFO L134 CoverageAnalysis]: Checked inductivity of 146 backedges. 35 proven. 34 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2021-05-02 13:39:01,294 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:39:01,294 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1721782201] [2021-05-02 13:39:01,294 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 13:39:01,295 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [31674671] [2021-05-02 13:39:01,295 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [31674671] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:39:01,295 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 13:39:01,295 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2021-05-02 13:39:01,295 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [803975202] [2021-05-02 13:39:01,295 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2021-05-02 13:39:01,295 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:39:01,295 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-05-02 13:39:01,296 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=127, Unknown=0, NotChecked=0, Total=156 [2021-05-02 13:39:01,296 INFO L87 Difference]: Start difference. First operand 194 states and 238 transitions. Second operand has 13 states, 12 states have (on average 2.1666666666666665) internal successors, (26), 10 states have internal predecessors, (26), 6 states have call successors, (13), 2 states have call predecessors, (13), 3 states have return successors, (11), 6 states have call predecessors, (11), 5 states have call successors, (11) [2021-05-02 13:39:01,569 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:39:01,569 INFO L93 Difference]: Finished difference Result 216 states and 267 transitions. [2021-05-02 13:39:01,569 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-05-02 13:39:01,570 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 12 states have (on average 2.1666666666666665) internal successors, (26), 10 states have internal predecessors, (26), 6 states have call successors, (13), 2 states have call predecessors, (13), 3 states have return successors, (11), 6 states have call predecessors, (11), 5 states have call successors, (11) Word has length 68 [2021-05-02 13:39:01,570 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:39:01,571 INFO L225 Difference]: With dead ends: 216 [2021-05-02 13:39:01,571 INFO L226 Difference]: Without dead ends: 209 [2021-05-02 13:39:01,571 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 70 GetRequests, 55 SyntacticMatches, 1 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 29 ImplicationChecksByTransitivity, 136.7ms TimeCoverageRelationStatistics Valid=44, Invalid=196, Unknown=0, NotChecked=0, Total=240 [2021-05-02 13:39:01,572 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 209 states. [2021-05-02 13:39:01,582 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 209 to 172. [2021-05-02 13:39:01,583 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 172 states, 102 states have (on average 1.1470588235294117) internal successors, (117), 106 states have internal predecessors, (117), 46 states have call successors, (46), 24 states have call predecessors, (46), 23 states have return successors, (43), 41 states have call predecessors, (43), 43 states have call successors, (43) [2021-05-02 13:39:01,583 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 172 states to 172 states and 206 transitions. [2021-05-02 13:39:01,584 INFO L78 Accepts]: Start accepts. Automaton has 172 states and 206 transitions. Word has length 68 [2021-05-02 13:39:01,584 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:39:01,584 INFO L480 AbstractCegarLoop]: Abstraction has 172 states and 206 transitions. [2021-05-02 13:39:01,584 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 13 states, 12 states have (on average 2.1666666666666665) internal successors, (26), 10 states have internal predecessors, (26), 6 states have call successors, (13), 2 states have call predecessors, (13), 3 states have return successors, (11), 6 states have call predecessors, (11), 5 states have call successors, (11) [2021-05-02 13:39:01,584 INFO L276 IsEmpty]: Start isEmpty. Operand 172 states and 206 transitions. [2021-05-02 13:39:01,584 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2021-05-02 13:39:01,585 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:39:01,585 INFO L523 BasicCegarLoop]: trace histogram [9, 8, 8, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:39:01,800 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2021-05-02 13:39:01,801 INFO L428 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:39:01,801 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:39:01,801 INFO L82 PathProgramCache]: Analyzing trace with hash -860063341, now seen corresponding path program 3 times [2021-05-02 13:39:01,801 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:39:01,801 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1022112443] [2021-05-02 13:39:01,801 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:39:01,807 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 13:39:01,807 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1814624121] [2021-05-02 13:39:01,807 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 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:39:01,847 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-05-02 13:39:01,847 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:39:01,848 INFO L263 TraceCheckSpWp]: Trace formula consists of 184 conjuncts, 42 conjunts are in the unsatisfiable core [2021-05-02 13:39:01,849 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:39:01,868 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:39:01,869 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:39:01,887 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:39:01,888 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:39:01,895 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:39:01,896 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:39:01,902 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:39:01,903 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:39:01,926 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:39:01,927 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:39:01,933 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:39:01,933 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:39:01,941 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:39:01,942 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:39:01,978 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:39:01,979 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:39:01,985 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:39:01,985 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:39:01,991 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:39:01,991 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:39:02,005 INFO L134 CoverageAnalysis]: Checked inductivity of 146 backedges. 30 proven. 24 refuted. 0 times theorem prover too weak. 92 trivial. 0 not checked. [2021-05-02 13:39:02,005 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:39:02,005 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1022112443] [2021-05-02 13:39:02,005 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 13:39:02,005 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1814624121] [2021-05-02 13:39:02,005 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1814624121] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:39:02,005 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 13:39:02,006 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2021-05-02 13:39:02,006 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [961101835] [2021-05-02 13:39:02,006 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2021-05-02 13:39:02,006 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:39:02,007 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-05-02 13:39:02,007 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=107, Unknown=0, NotChecked=0, Total=132 [2021-05-02 13:39:02,007 INFO L87 Difference]: Start difference. First operand 172 states and 206 transitions. Second operand has 12 states, 12 states have (on average 2.1666666666666665) internal successors, (26), 10 states have internal predecessors, (26), 5 states have call successors, (13), 2 states have call predecessors, (13), 3 states have return successors, (11), 5 states have call predecessors, (11), 5 states have call successors, (11) [2021-05-02 13:39:02,239 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:39:02,239 INFO L93 Difference]: Finished difference Result 197 states and 246 transitions. [2021-05-02 13:39:02,239 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-05-02 13:39:02,240 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 2.1666666666666665) internal successors, (26), 10 states have internal predecessors, (26), 5 states have call successors, (13), 2 states have call predecessors, (13), 3 states have return successors, (11), 5 states have call predecessors, (11), 5 states have call successors, (11) Word has length 68 [2021-05-02 13:39:02,240 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:39:02,241 INFO L225 Difference]: With dead ends: 197 [2021-05-02 13:39:02,241 INFO L226 Difference]: Without dead ends: 191 [2021-05-02 13:39:02,241 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 70 GetRequests, 56 SyntacticMatches, 1 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 76.6ms TimeCoverageRelationStatistics Valid=40, Invalid=170, Unknown=0, NotChecked=0, Total=210 [2021-05-02 13:39:02,242 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 191 states. [2021-05-02 13:39:02,255 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 191 to 188. [2021-05-02 13:39:02,256 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 188 states, 111 states have (on average 1.162162162162162) internal successors, (129), 115 states have internal predecessors, (129), 52 states have call successors, (52), 25 states have call predecessors, (52), 24 states have return successors, (49), 47 states have call predecessors, (49), 49 states have call successors, (49) [2021-05-02 13:39:02,257 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 188 states to 188 states and 230 transitions. [2021-05-02 13:39:02,257 INFO L78 Accepts]: Start accepts. Automaton has 188 states and 230 transitions. Word has length 68 [2021-05-02 13:39:02,257 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:39:02,257 INFO L480 AbstractCegarLoop]: Abstraction has 188 states and 230 transitions. [2021-05-02 13:39:02,257 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 12 states, 12 states have (on average 2.1666666666666665) internal successors, (26), 10 states have internal predecessors, (26), 5 states have call successors, (13), 2 states have call predecessors, (13), 3 states have return successors, (11), 5 states have call predecessors, (11), 5 states have call successors, (11) [2021-05-02 13:39:02,257 INFO L276 IsEmpty]: Start isEmpty. Operand 188 states and 230 transitions. [2021-05-02 13:39:02,258 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2021-05-02 13:39:02,258 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:39:02,259 INFO L523 BasicCegarLoop]: trace histogram [10, 9, 9, 4, 4, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:39:02,477 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14,15 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:39:02,477 INFO L428 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:39:02,478 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:39:02,478 INFO L82 PathProgramCache]: Analyzing trace with hash -1342972876, now seen corresponding path program 5 times [2021-05-02 13:39:02,478 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:39:02,478 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1317410665] [2021-05-02 13:39:02,478 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:39:02,489 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 13:39:02,490 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2019181729] [2021-05-02 13:39:02,490 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true