/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data --core.log.level.for.class de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN -tc ../../../trunk/examples/toolchains/AutomizerC.xml -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/nla-digbench-scaling/ps3-ll_unwindbound100.c -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-6253b08 [2021-05-06 04:35:14,099 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-05-06 04:35:14,102 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-05-06 04:35:14,132 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-05-06 04:35:14,133 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-05-06 04:35:14,136 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-05-06 04:35:14,138 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-05-06 04:35:14,142 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-05-06 04:35:14,144 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-05-06 04:35:14,148 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-05-06 04:35:14,148 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-05-06 04:35:14,149 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-05-06 04:35:14,149 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-05-06 04:35:14,151 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-05-06 04:35:14,152 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-05-06 04:35:14,153 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-05-06 04:35:14,155 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-05-06 04:35:14,156 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-05-06 04:35:14,158 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-05-06 04:35:14,163 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-05-06 04:35:14,165 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-05-06 04:35:14,166 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-05-06 04:35:14,167 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-05-06 04:35:14,169 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-05-06 04:35:14,170 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-05-06 04:35:14,170 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-05-06 04:35:14,171 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-05-06 04:35:14,172 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-05-06 04:35:14,172 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-05-06 04:35:14,172 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-05-06 04:35:14,173 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-05-06 04:35:14,173 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-05-06 04:35:14,174 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-05-06 04:35:14,175 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-05-06 04:35:14,175 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-05-06 04:35:14,175 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-05-06 04:35:14,176 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-05-06 04:35:14,176 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-05-06 04:35:14,176 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-05-06 04:35:14,176 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-05-06 04:35:14,177 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-05-06 04:35:14,180 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 [2021-05-06 04:35:14,206 INFO L113 SettingsManager]: Loading preferences was successful [2021-05-06 04:35:14,206 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-05-06 04:35:14,209 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-05-06 04:35:14,209 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-05-06 04:35:14,209 INFO L138 SettingsManager]: * Use SBE=true [2021-05-06 04:35:14,209 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-05-06 04:35:14,209 INFO L138 SettingsManager]: * sizeof long=4 [2021-05-06 04:35:14,209 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-05-06 04:35:14,209 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-05-06 04:35:14,209 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-05-06 04:35:14,210 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-05-06 04:35:14,210 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-05-06 04:35:14,210 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-05-06 04:35:14,210 INFO L138 SettingsManager]: * sizeof long double=12 [2021-05-06 04:35:14,211 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-05-06 04:35:14,211 INFO L138 SettingsManager]: * Use constant arrays=true [2021-05-06 04:35:14,211 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-05-06 04:35:14,211 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-05-06 04:35:14,211 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-05-06 04:35:14,211 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-05-06 04:35:14,211 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-06 04:35:14,211 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-05-06 04:35:14,211 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-05-06 04:35:14,212 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-05-06 04:35:14,212 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-05-06 04:35:14,212 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-05-06 04:35:14,212 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-05-06 04:35:14,212 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-05-06 04:35:14,212 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2021-05-06 04:35:14,449 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-05-06 04:35:14,464 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-05-06 04:35:14,466 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-05-06 04:35:14,466 INFO L271 PluginConnector]: Initializing CDTParser... [2021-05-06 04:35:14,467 INFO L275 PluginConnector]: CDTParser initialized [2021-05-06 04:35:14,467 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/nla-digbench-scaling/ps3-ll_unwindbound100.c [2021-05-06 04:35:14,518 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/e76040357/989c61d5e159424e8fe0f84b63ff9c07/FLAG666ed483f [2021-05-06 04:35:14,885 INFO L306 CDTParser]: Found 1 translation units. [2021-05-06 04:35:14,887 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/nla-digbench-scaling/ps3-ll_unwindbound100.c [2021-05-06 04:35:14,891 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/e76040357/989c61d5e159424e8fe0f84b63ff9c07/FLAG666ed483f [2021-05-06 04:35:15,321 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/e76040357/989c61d5e159424e8fe0f84b63ff9c07 [2021-05-06 04:35:15,323 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-05-06 04:35:15,324 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2021-05-06 04:35:15,326 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-05-06 04:35:15,326 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-05-06 04:35:15,328 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-05-06 04:35:15,329 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.05 04:35:15" (1/1) ... [2021-05-06 04:35:15,330 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@6033c814 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 04:35:15, skipping insertion in model container [2021-05-06 04:35:15,330 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.05 04:35:15" (1/1) ... [2021-05-06 04:35:15,334 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-05-06 04:35:15,343 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-05-06 04:35:15,420 WARN L224 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/nla-digbench-scaling/ps3-ll_unwindbound100.c[458,471] [2021-05-06 04:35:15,427 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-06 04:35:15,432 INFO L203 MainTranslator]: Completed pre-run [2021-05-06 04:35:15,451 WARN L224 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/nla-digbench-scaling/ps3-ll_unwindbound100.c[458,471] [2021-05-06 04:35:15,464 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-06 04:35:15,486 INFO L208 MainTranslator]: Completed translation [2021-05-06 04:35:15,486 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 04:35:15 WrapperNode [2021-05-06 04:35:15,487 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-05-06 04:35:15,489 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-05-06 04:35:15,489 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-05-06 04:35:15,490 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-05-06 04:35:15,497 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 04:35:15" (1/1) ... [2021-05-06 04:35:15,497 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 04:35:15" (1/1) ... [2021-05-06 04:35:15,502 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 04:35:15" (1/1) ... [2021-05-06 04:35:15,502 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 04:35:15" (1/1) ... [2021-05-06 04:35:15,512 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 04:35:15" (1/1) ... [2021-05-06 04:35:15,515 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 04:35:15" (1/1) ... [2021-05-06 04:35:15,517 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 04:35:15" (1/1) ... [2021-05-06 04:35:15,523 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-05-06 04:35:15,524 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-05-06 04:35:15,524 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-05-06 04:35:15,524 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-05-06 04:35:15,525 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 04:35:15" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-06 04:35:15,586 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-05-06 04:35:15,586 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-05-06 04:35:15,586 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2021-05-06 04:35:15,587 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2021-05-06 04:35:15,587 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-05-06 04:35:15,587 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-05-06 04:35:15,587 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2021-05-06 04:35:15,587 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2021-05-06 04:35:15,588 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2021-05-06 04:35:15,588 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-05-06 04:35:15,588 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_short [2021-05-06 04:35:15,588 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2021-05-06 04:35:15,589 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-05-06 04:35:15,589 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-05-06 04:35:15,589 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-05-06 04:35:15,589 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-05-06 04:35:15,589 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-05-06 04:35:15,589 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-05-06 04:35:15,590 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-05-06 04:35:15,590 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-05-06 04:35:15,811 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-05-06 04:35:15,811 INFO L299 CfgBuilder]: Removed 1 assume(true) statements. [2021-05-06 04:35:15,812 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.05 04:35:15 BoogieIcfgContainer [2021-05-06 04:35:15,812 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-05-06 04:35:15,813 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-05-06 04:35:15,813 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-05-06 04:35:15,815 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-05-06 04:35:15,815 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 06.05 04:35:15" (1/3) ... [2021-05-06 04:35:15,816 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4f500c8 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.05 04:35:15, skipping insertion in model container [2021-05-06 04:35:15,816 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 04:35:15" (2/3) ... [2021-05-06 04:35:15,816 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4f500c8 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.05 04:35:15, skipping insertion in model container [2021-05-06 04:35:15,816 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.05 04:35:15" (3/3) ... [2021-05-06 04:35:15,817 INFO L111 eAbstractionObserver]: Analyzing ICFG ps3-ll_unwindbound100.c [2021-05-06 04:35:15,821 INFO L149 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-05-06 04:35:15,823 INFO L161 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-05-06 04:35:15,851 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-05-06 04:35:15,866 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-05-06 04:35:15,866 INFO L377 AbstractCegarLoop]: Hoare is true [2021-05-06 04:35:15,866 INFO L378 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-05-06 04:35:15,866 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-05-06 04:35:15,866 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-05-06 04:35:15,866 INFO L381 AbstractCegarLoop]: Difference is false [2021-05-06 04:35:15,866 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-05-06 04:35:15,866 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-05-06 04:35:15,879 INFO L276 IsEmpty]: Start isEmpty. Operand has 22 states, 13 states have (on average 1.3846153846153846) internal successors, (18), 14 states have internal predecessors, (18), 4 states have call successors, (4), 3 states have call predecessors, (4), 3 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-05-06 04:35:15,882 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-05-06 04:35:15,882 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 04:35:15,883 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 04:35:15,883 INFO L428 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 04:35:15,890 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 04:35:15,890 INFO L82 PathProgramCache]: Analyzing trace with hash 1665267581, now seen corresponding path program 1 times [2021-05-06 04:35:15,896 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 04:35:15,896 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [248104966] [2021-05-06 04:35:15,897 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 04:35:15,976 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 04:35:16,085 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 04:35:16,093 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 04:35:16,103 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 04:35:16,104 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 04:35:16,104 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [248104966] [2021-05-06 04:35:16,104 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [248104966] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 04:35:16,105 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 04:35:16,105 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-05-06 04:35:16,105 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [421109058] [2021-05-06 04:35:16,108 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-05-06 04:35:16,108 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 04:35:16,115 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-05-06 04:35:16,116 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-06 04:35:16,117 INFO L87 Difference]: Start difference. First operand has 22 states, 13 states have (on average 1.3846153846153846) internal successors, (18), 14 states have internal predecessors, (18), 4 states have call successors, (4), 3 states have call predecessors, (4), 3 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) Second operand has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 04:35:16,175 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 04:35:16,175 INFO L93 Difference]: Finished difference Result 39 states and 50 transitions. [2021-05-06 04:35:16,177 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-05-06 04:35:16,178 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 11 [2021-05-06 04:35:16,179 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 04:35:16,183 INFO L225 Difference]: With dead ends: 39 [2021-05-06 04:35:16,183 INFO L226 Difference]: Without dead ends: 18 [2021-05-06 04:35:16,185 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 49.3ms TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-06 04:35:16,195 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2021-05-06 04:35:16,205 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 17. [2021-05-06 04:35:16,206 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 17 states, 10 states have (on average 1.3) internal successors, (13), 11 states have internal predecessors, (13), 4 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 04:35:16,206 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 19 transitions. [2021-05-06 04:35:16,207 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 19 transitions. Word has length 11 [2021-05-06 04:35:16,207 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 04:35:16,208 INFO L480 AbstractCegarLoop]: Abstraction has 17 states and 19 transitions. [2021-05-06 04:35:16,208 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 04:35:16,208 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 19 transitions. [2021-05-06 04:35:16,208 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-05-06 04:35:16,208 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 04:35:16,208 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 04:35:16,209 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-05-06 04:35:16,209 INFO L428 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 04:35:16,209 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 04:35:16,209 INFO L82 PathProgramCache]: Analyzing trace with hash -318583316, now seen corresponding path program 1 times [2021-05-06 04:35:16,209 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 04:35:16,210 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1955101811] [2021-05-06 04:35:16,210 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 04:35:16,220 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 04:35:16,220 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [433395518] [2021-05-06 04:35:16,220 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 [2021-05-06 04:35:16,275 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 04:35:16,277 INFO L263 TraceCheckSpWp]: Trace formula consists of 105 conjuncts, 5 conjunts are in the unsatisfiable core [2021-05-06 04:35:16,280 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 04:35:16,335 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:35:16,352 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:35:16,354 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:35:16,367 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:35:16,370 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:35:16,385 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 04:35:16,385 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 04:35:16,385 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1955101811] [2021-05-06 04:35:16,385 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 04:35:16,385 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [433395518] [2021-05-06 04:35:16,385 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [433395518] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 04:35:16,386 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 04:35:16,386 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-05-06 04:35:16,386 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1247980858] [2021-05-06 04:35:16,387 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-05-06 04:35:16,387 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 04:35:16,387 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-05-06 04:35:16,387 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-06 04:35:16,388 INFO L87 Difference]: Start difference. First operand 17 states and 19 transitions. Second operand has 4 states, 4 states have (on average 2.0) internal successors, (8), 3 states have internal predecessors, (8), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 04:35:16,397 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 04:35:16,397 INFO L93 Difference]: Finished difference Result 26 states and 28 transitions. [2021-05-06 04:35:16,397 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-05-06 04:35:16,397 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.0) internal successors, (8), 3 states have internal predecessors, (8), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 12 [2021-05-06 04:35:16,398 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 04:35:16,398 INFO L225 Difference]: With dead ends: 26 [2021-05-06 04:35:16,398 INFO L226 Difference]: Without dead ends: 19 [2021-05-06 04:35:16,399 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 5.6ms TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-06 04:35:16,399 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2021-05-06 04:35:16,402 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2021-05-06 04:35:16,402 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19 states, 12 states have (on average 1.25) internal successors, (15), 13 states have internal predecessors, (15), 4 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 04:35:16,403 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 21 transitions. [2021-05-06 04:35:16,403 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 21 transitions. Word has length 12 [2021-05-06 04:35:16,403 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 04:35:16,403 INFO L480 AbstractCegarLoop]: Abstraction has 19 states and 21 transitions. [2021-05-06 04:35:16,403 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 4 states, 4 states have (on average 2.0) internal successors, (8), 3 states have internal predecessors, (8), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 04:35:16,403 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 21 transitions. [2021-05-06 04:35:16,404 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-05-06 04:35:16,404 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 04:35:16,404 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 04:35:16,621 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1 [2021-05-06 04:35:16,622 INFO L428 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 04:35:16,622 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 04:35:16,622 INFO L82 PathProgramCache]: Analyzing trace with hash -316795856, now seen corresponding path program 1 times [2021-05-06 04:35:16,622 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 04:35:16,623 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [390735445] [2021-05-06 04:35:16,623 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 04:35:16,630 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 04:35:16,631 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1611814749] [2021-05-06 04:35:16,631 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 [2021-05-06 04:35:16,695 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 04:35:16,696 INFO L263 TraceCheckSpWp]: Trace formula consists of 105 conjuncts, 7 conjunts are in the unsatisfiable core [2021-05-06 04:35:16,698 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 04:35:16,761 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:35:16,776 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 04:35:16,777 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 04:35:16,777 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [390735445] [2021-05-06 04:35:16,777 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 04:35:16,778 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1611814749] [2021-05-06 04:35:16,779 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1611814749] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 04:35:16,779 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 04:35:16,779 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-05-06 04:35:16,779 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1357492574] [2021-05-06 04:35:16,779 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-05-06 04:35:16,779 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 04:35:16,780 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-05-06 04:35:16,780 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-05-06 04:35:16,780 INFO L87 Difference]: Start difference. First operand 19 states and 21 transitions. Second operand has 5 states, 5 states have (on average 1.6) internal successors, (8), 4 states have internal predecessors, (8), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 04:35:16,830 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 04:35:16,830 INFO L93 Difference]: Finished difference Result 28 states and 31 transitions. [2021-05-06 04:35:16,831 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-05-06 04:35:16,831 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 1.6) internal successors, (8), 4 states have internal predecessors, (8), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 12 [2021-05-06 04:35:16,831 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 04:35:16,832 INFO L225 Difference]: With dead ends: 28 [2021-05-06 04:35:16,832 INFO L226 Difference]: Without dead ends: 25 [2021-05-06 04:35:16,832 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 19.3ms TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-05-06 04:35:16,832 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2021-05-06 04:35:16,836 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2021-05-06 04:35:16,836 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 25 states, 16 states have (on average 1.1875) internal successors, (19), 17 states have internal predecessors, (19), 5 states have call successors, (5), 4 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-06 04:35:16,837 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 27 transitions. [2021-05-06 04:35:16,837 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 27 transitions. Word has length 12 [2021-05-06 04:35:16,837 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 04:35:16,837 INFO L480 AbstractCegarLoop]: Abstraction has 25 states and 27 transitions. [2021-05-06 04:35:16,837 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 5 states, 5 states have (on average 1.6) internal successors, (8), 4 states have internal predecessors, (8), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 04:35:16,837 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 27 transitions. [2021-05-06 04:35:16,838 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-06 04:35:16,838 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 04:35:16,838 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 04:35:17,052 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 04:35:17,053 INFO L428 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 04:35:17,053 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 04:35:17,053 INFO L82 PathProgramCache]: Analyzing trace with hash -2089867248, now seen corresponding path program 1 times [2021-05-06 04:35:17,054 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 04:35:17,054 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1292631109] [2021-05-06 04:35:17,054 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 04:35:17,061 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 04:35:17,061 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [866895424] [2021-05-06 04:35:17,061 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 [2021-05-06 04:35:17,127 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 04:35:17,128 INFO L263 TraceCheckSpWp]: Trace formula consists of 126 conjuncts, 7 conjunts are in the unsatisfiable core [2021-05-06 04:35:17,129 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 04:35:17,142 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:35:17,146 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:35:17,147 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:35:17,162 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:35:17,170 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:35:17,171 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:35:17,199 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:35:17,201 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:35:17,216 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 04:35:17,217 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 04:35:17,217 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1292631109] [2021-05-06 04:35:17,217 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 04:35:17,217 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [866895424] [2021-05-06 04:35:17,217 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [866895424] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 04:35:17,217 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-06 04:35:17,217 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5] total 5 [2021-05-06 04:35:17,217 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [864579065] [2021-05-06 04:35:17,218 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-05-06 04:35:17,218 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 04:35:17,218 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-05-06 04:35:17,219 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-05-06 04:35:17,219 INFO L87 Difference]: Start difference. First operand 25 states and 27 transitions. Second operand has 5 states, 5 states have (on average 2.8) internal successors, (14), 4 states have internal predecessors, (14), 4 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 04:35:17,250 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 04:35:17,250 INFO L93 Difference]: Finished difference Result 34 states and 36 transitions. [2021-05-06 04:35:17,250 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-06 04:35:17,250 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.8) internal successors, (14), 4 states have internal predecessors, (14), 4 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 20 [2021-05-06 04:35:17,251 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 04:35:17,251 INFO L225 Difference]: With dead ends: 34 [2021-05-06 04:35:17,252 INFO L226 Difference]: Without dead ends: 27 [2021-05-06 04:35:17,252 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 16 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 13.9ms TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-05-06 04:35:17,253 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2021-05-06 04:35:17,263 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2021-05-06 04:35:17,263 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27 states, 18 states have (on average 1.1666666666666667) internal successors, (21), 19 states have internal predecessors, (21), 5 states have call successors, (5), 4 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-06 04:35:17,266 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 29 transitions. [2021-05-06 04:35:17,266 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 29 transitions. Word has length 20 [2021-05-06 04:35:17,267 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 04:35:17,267 INFO L480 AbstractCegarLoop]: Abstraction has 27 states and 29 transitions. [2021-05-06 04:35:17,268 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 5 states, 5 states have (on average 2.8) internal successors, (14), 4 states have internal predecessors, (14), 4 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 04:35:17,268 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 29 transitions. [2021-05-06 04:35:17,269 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-06 04:35:17,269 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 04:35:17,269 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 04:35:17,477 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 04:35:17,477 INFO L428 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 04:35:17,477 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 04:35:17,478 INFO L82 PathProgramCache]: Analyzing trace with hash -2088079788, now seen corresponding path program 1 times [2021-05-06 04:35:17,478 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 04:35:17,478 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1023922189] [2021-05-06 04:35:17,478 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 04:35:17,484 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 04:35:17,485 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2012626530] [2021-05-06 04:35:17,485 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 [2021-05-06 04:35:17,541 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 04:35:17,542 INFO L263 TraceCheckSpWp]: Trace formula consists of 126 conjuncts, 11 conjunts are in the unsatisfiable core [2021-05-06 04:35:17,543 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 04:35:17,601 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:35:17,611 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 2 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 04:35:17,611 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 04:35:17,612 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1023922189] [2021-05-06 04:35:17,612 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 04:35:17,612 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2012626530] [2021-05-06 04:35:17,612 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2012626530] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 04:35:17,612 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-06 04:35:17,612 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2021-05-06 04:35:17,612 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1544319695] [2021-05-06 04:35:17,612 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-06 04:35:17,612 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 04:35:17,613 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-06 04:35:17,613 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-05-06 04:35:17,613 INFO L87 Difference]: Start difference. First operand 27 states and 29 transitions. Second operand has 6 states, 6 states have (on average 2.3333333333333335) internal successors, (14), 5 states have internal predecessors, (14), 3 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 04:35:17,653 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 04:35:17,653 INFO L93 Difference]: Finished difference Result 36 states and 39 transitions. [2021-05-06 04:35:17,653 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-06 04:35:17,654 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 2.3333333333333335) internal successors, (14), 5 states have internal predecessors, (14), 3 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 20 [2021-05-06 04:35:17,654 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 04:35:17,655 INFO L225 Difference]: With dead ends: 36 [2021-05-06 04:35:17,655 INFO L226 Difference]: Without dead ends: 33 [2021-05-06 04:35:17,657 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 15 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 21.9ms TimeCoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2021-05-06 04:35:17,657 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2021-05-06 04:35:17,663 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2021-05-06 04:35:17,663 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 33 states, 22 states have (on average 1.1363636363636365) internal successors, (25), 23 states have internal predecessors, (25), 6 states have call successors, (6), 5 states have call predecessors, (6), 4 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-05-06 04:35:17,666 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 35 transitions. [2021-05-06 04:35:17,666 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 35 transitions. Word has length 20 [2021-05-06 04:35:17,666 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 04:35:17,666 INFO L480 AbstractCegarLoop]: Abstraction has 33 states and 35 transitions. [2021-05-06 04:35:17,666 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 2.3333333333333335) internal successors, (14), 5 states have internal predecessors, (14), 3 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 04:35:17,666 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 35 transitions. [2021-05-06 04:35:17,667 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2021-05-06 04:35:17,667 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 04:35:17,668 INFO L523 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 04:35:17,882 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 04:35:17,882 INFO L428 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 04:35:17,883 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 04:35:17,883 INFO L82 PathProgramCache]: Analyzing trace with hash -696181196, now seen corresponding path program 2 times [2021-05-06 04:35:17,883 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 04:35:17,883 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [536520264] [2021-05-06 04:35:17,883 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 04:35:17,890 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 04:35:17,890 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [879374776] [2021-05-06 04:35:17,890 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 04:35:17,936 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-06 04:35:17,936 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 04:35:17,937 INFO L263 TraceCheckSpWp]: Trace formula consists of 147 conjuncts, 9 conjunts are in the unsatisfiable core [2021-05-06 04:35:17,938 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 04:35:17,948 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:35:17,950 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:35:17,953 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:35:17,959 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:35:17,962 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:35:17,963 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:35:17,979 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:35:17,982 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:35:17,983 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:35:18,002 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:35:18,004 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:35:18,014 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 4 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 04:35:18,014 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 04:35:18,014 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [536520264] [2021-05-06 04:35:18,014 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 04:35:18,015 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [879374776] [2021-05-06 04:35:18,015 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [879374776] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 04:35:18,015 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-06 04:35:18,015 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2021-05-06 04:35:18,015 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1618591007] [2021-05-06 04:35:18,015 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-06 04:35:18,016 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 04:35:18,016 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-06 04:35:18,016 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-05-06 04:35:18,017 INFO L87 Difference]: Start difference. First operand 33 states and 35 transitions. Second operand has 6 states, 6 states have (on average 3.3333333333333335) internal successors, (20), 5 states have internal predecessors, (20), 5 states have call successors, (5), 5 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-06 04:35:18,052 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 04:35:18,052 INFO L93 Difference]: Finished difference Result 42 states and 44 transitions. [2021-05-06 04:35:18,052 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-06 04:35:18,052 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 3.3333333333333335) internal successors, (20), 5 states have internal predecessors, (20), 5 states have call successors, (5), 5 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Word has length 28 [2021-05-06 04:35:18,052 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 04:35:18,054 INFO L225 Difference]: With dead ends: 42 [2021-05-06 04:35:18,054 INFO L226 Difference]: Without dead ends: 35 [2021-05-06 04:35:18,055 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 23 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 20.1ms TimeCoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2021-05-06 04:35:18,055 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2021-05-06 04:35:18,059 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 35. [2021-05-06 04:35:18,059 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 35 states, 24 states have (on average 1.125) internal successors, (27), 25 states have internal predecessors, (27), 6 states have call successors, (6), 5 states have call predecessors, (6), 4 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-05-06 04:35:18,060 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 37 transitions. [2021-05-06 04:35:18,060 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 37 transitions. Word has length 28 [2021-05-06 04:35:18,060 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 04:35:18,060 INFO L480 AbstractCegarLoop]: Abstraction has 35 states and 37 transitions. [2021-05-06 04:35:18,060 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 3.3333333333333335) internal successors, (20), 5 states have internal predecessors, (20), 5 states have call successors, (5), 5 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-06 04:35:18,061 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 37 transitions. [2021-05-06 04:35:18,061 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2021-05-06 04:35:18,061 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 04:35:18,061 INFO L523 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 04:35:18,272 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2021-05-06 04:35:18,273 INFO L428 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 04:35:18,273 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 04:35:18,273 INFO L82 PathProgramCache]: Analyzing trace with hash -694393736, now seen corresponding path program 2 times [2021-05-06 04:35:18,273 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 04:35:18,273 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2137711101] [2021-05-06 04:35:18,273 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 04:35:18,280 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 04:35:18,280 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1340159885] [2021-05-06 04:35:18,280 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 04:35:18,386 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-06 04:35:18,386 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 04:35:18,387 INFO L263 TraceCheckSpWp]: Trace formula consists of 147 conjuncts, 20 conjunts are in the unsatisfiable core [2021-05-06 04:35:18,388 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 04:35:18,481 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:35:18,491 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 6 proven. 11 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-06 04:35:18,491 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 04:35:18,491 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2137711101] [2021-05-06 04:35:18,491 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 04:35:18,491 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1340159885] [2021-05-06 04:35:18,491 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1340159885] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 04:35:18,491 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-06 04:35:18,492 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2021-05-06 04:35:18,492 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1536575320] [2021-05-06 04:35:18,493 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-06 04:35:18,494 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 04:35:18,494 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-06 04:35:18,494 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=56, Unknown=0, NotChecked=0, Total=72 [2021-05-06 04:35:18,494 INFO L87 Difference]: Start difference. First operand 35 states and 37 transitions. Second operand has 9 states, 9 states have (on average 2.2222222222222223) internal successors, (20), 8 states have internal predecessors, (20), 4 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-06 04:35:18,610 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 04:35:18,610 INFO L93 Difference]: Finished difference Result 44 states and 47 transitions. [2021-05-06 04:35:18,610 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-06 04:35:18,610 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 2.2222222222222223) internal successors, (20), 8 states have internal predecessors, (20), 4 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Word has length 28 [2021-05-06 04:35:18,611 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 04:35:18,611 INFO L225 Difference]: With dead ends: 44 [2021-05-06 04:35:18,611 INFO L226 Difference]: Without dead ends: 41 [2021-05-06 04:35:18,611 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 19 SyntacticMatches, 1 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 57.2ms TimeCoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2021-05-06 04:35:18,612 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2021-05-06 04:35:18,615 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 41. [2021-05-06 04:35:18,615 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 41 states, 28 states have (on average 1.1071428571428572) internal successors, (31), 29 states have internal predecessors, (31), 7 states have call successors, (7), 6 states have call predecessors, (7), 5 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-05-06 04:35:18,615 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 43 transitions. [2021-05-06 04:35:18,615 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 43 transitions. Word has length 28 [2021-05-06 04:35:18,616 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 04:35:18,616 INFO L480 AbstractCegarLoop]: Abstraction has 41 states and 43 transitions. [2021-05-06 04:35:18,616 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 9 states, 9 states have (on average 2.2222222222222223) internal successors, (20), 8 states have internal predecessors, (20), 4 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-06 04:35:18,616 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 43 transitions. [2021-05-06 04:35:18,616 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2021-05-06 04:35:18,617 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 04:35:18,617 INFO L523 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 04:35:18,823 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 04:35:18,823 INFO L428 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 04:35:18,824 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 04:35:18,824 INFO L82 PathProgramCache]: Analyzing trace with hash 618442840, now seen corresponding path program 3 times [2021-05-06 04:35:18,824 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 04:35:18,824 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [754814242] [2021-05-06 04:35:18,824 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 04:35:18,831 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 04:35:18,831 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [323813195] [2021-05-06 04:35:18,831 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true