/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data -tc config/AutomizerReach.xml -s config/svcomp-Reach-64bit-Automizer_Default.epf -i ../sv-benchmarks/c/array-examples/standard_init1_ground-2.i -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-4f750a8 [2020-12-21 21:29:31,030 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-12-21 21:29:31,033 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-12-21 21:29:31,083 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-12-21 21:29:31,084 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-12-21 21:29:31,088 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-12-21 21:29:31,092 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-12-21 21:29:31,100 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-12-21 21:29:31,103 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-12-21 21:29:31,110 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-12-21 21:29:31,111 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-12-21 21:29:31,112 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-12-21 21:29:31,113 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-12-21 21:29:31,117 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-12-21 21:29:31,119 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-12-21 21:29:31,121 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-12-21 21:29:31,122 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-12-21 21:29:31,123 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-12-21 21:29:31,145 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-12-21 21:29:31,152 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-12-21 21:29:31,157 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-12-21 21:29:31,158 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-12-21 21:29:31,160 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-12-21 21:29:31,161 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-12-21 21:29:31,171 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-12-21 21:29:31,171 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-12-21 21:29:31,172 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-12-21 21:29:31,174 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-12-21 21:29:31,175 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-12-21 21:29:31,176 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-12-21 21:29:31,176 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-12-21 21:29:31,177 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-12-21 21:29:31,180 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-12-21 21:29:31,181 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-12-21 21:29:31,182 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-12-21 21:29:31,182 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-12-21 21:29:31,183 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-12-21 21:29:31,183 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-12-21 21:29:31,183 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-12-21 21:29:31,184 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-12-21 21:29:31,185 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-12-21 21:29:31,186 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-Reach-64bit-Automizer_Default.epf [2020-12-21 21:29:31,252 INFO L113 SettingsManager]: Loading preferences was successful [2020-12-21 21:29:31,252 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-12-21 21:29:31,256 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-12-21 21:29:31,256 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-12-21 21:29:31,257 INFO L138 SettingsManager]: * Use SBE=true [2020-12-21 21:29:31,258 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-12-21 21:29:31,259 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-12-21 21:29:31,259 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-12-21 21:29:31,259 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-12-21 21:29:31,260 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-12-21 21:29:31,261 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-12-21 21:29:31,261 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-12-21 21:29:31,261 INFO L138 SettingsManager]: * Use constant arrays=true [2020-12-21 21:29:31,261 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-12-21 21:29:31,262 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-12-21 21:29:31,262 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-12-21 21:29:31,262 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-12-21 21:29:31,262 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-12-21 21:29:31,263 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-12-21 21:29:31,263 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-12-21 21:29:31,263 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-12-21 21:29:31,263 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-12-21 21:29:31,264 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-12-21 21:29:31,264 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-12-21 21:29:31,264 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-12-21 21:29:31,264 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release [2020-12-21 21:29:31,681 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-12-21 21:29:31,711 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-12-21 21:29:31,715 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-12-21 21:29:31,716 INFO L271 PluginConnector]: Initializing CDTParser... [2020-12-21 21:29:31,717 INFO L275 PluginConnector]: CDTParser initialized [2020-12-21 21:29:31,718 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/array-examples/standard_init1_ground-2.i [2020-12-21 21:29:31,810 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/2627a26a3/1250de7086d049f891fc0cd123c29a44/FLAGb76905b79 [2020-12-21 21:29:32,524 INFO L306 CDTParser]: Found 1 translation units. [2020-12-21 21:29:32,525 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/array-examples/standard_init1_ground-2.i [2020-12-21 21:29:32,533 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/2627a26a3/1250de7086d049f891fc0cd123c29a44/FLAGb76905b79 [2020-12-21 21:29:32,867 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/2627a26a3/1250de7086d049f891fc0cd123c29a44 [2020-12-21 21:29:32,872 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-12-21 21:29:32,874 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2020-12-21 21:29:32,879 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-12-21 21:29:32,879 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-12-21 21:29:32,884 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-12-21 21:29:32,885 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.12 09:29:32" (1/1) ... [2020-12-21 21:29:32,887 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@1669ef31 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 09:29:32, skipping insertion in model container [2020-12-21 21:29:32,887 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.12 09:29:32" (1/1) ... [2020-12-21 21:29:32,897 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-12-21 21:29:32,916 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-12-21 21:29:33,071 WARN L226 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/array-examples/standard_init1_ground-2.i[816,829] [2020-12-21 21:29:33,086 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-12-21 21:29:33,095 INFO L203 MainTranslator]: Completed pre-run [2020-12-21 21:29:33,110 WARN L226 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/array-examples/standard_init1_ground-2.i[816,829] [2020-12-21 21:29:33,116 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-12-21 21:29:33,133 INFO L208 MainTranslator]: Completed translation [2020-12-21 21:29:33,134 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 09:29:33 WrapperNode [2020-12-21 21:29:33,134 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-12-21 21:29:33,135 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2020-12-21 21:29:33,136 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2020-12-21 21:29:33,136 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2020-12-21 21:29:33,145 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 09:29:33" (1/1) ... [2020-12-21 21:29:33,154 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 09:29:33" (1/1) ... [2020-12-21 21:29:33,173 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2020-12-21 21:29:33,174 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-12-21 21:29:33,174 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-12-21 21:29:33,174 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-12-21 21:29:33,184 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 09:29:33" (1/1) ... [2020-12-21 21:29:33,184 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 09:29:33" (1/1) ... [2020-12-21 21:29:33,186 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 09:29:33" (1/1) ... [2020-12-21 21:29:33,186 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 09:29:33" (1/1) ... [2020-12-21 21:29:33,192 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 09:29:33" (1/1) ... [2020-12-21 21:29:33,197 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 09:29:33" (1/1) ... [2020-12-21 21:29:33,198 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 09:29:33" (1/1) ... [2020-12-21 21:29:33,200 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-12-21 21:29:33,201 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-12-21 21:29:33,202 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-12-21 21:29:33,202 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-12-21 21:29:33,203 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 09:29:33" (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 [2020-12-21 21:29:33,321 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2020-12-21 21:29:33,322 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-12-21 21:29:33,323 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-12-21 21:29:33,323 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-12-21 21:29:33,323 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-12-21 21:29:33,324 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-12-21 21:29:33,324 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-12-21 21:29:33,601 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-12-21 21:29:33,601 INFO L299 CfgBuilder]: Removed 8 assume(true) statements. [2020-12-21 21:29:33,603 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.12 09:29:33 BoogieIcfgContainer [2020-12-21 21:29:33,603 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-12-21 21:29:33,605 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-12-21 21:29:33,606 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-12-21 21:29:33,609 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-12-21 21:29:33,610 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.12 09:29:32" (1/3) ... [2020-12-21 21:29:33,611 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@a6176a1 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.12 09:29:33, skipping insertion in model container [2020-12-21 21:29:33,611 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 09:29:33" (2/3) ... [2020-12-21 21:29:33,611 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@a6176a1 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.12 09:29:33, skipping insertion in model container [2020-12-21 21:29:33,612 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.12 09:29:33" (3/3) ... [2020-12-21 21:29:33,614 INFO L111 eAbstractionObserver]: Analyzing ICFG standard_init1_ground-2.i [2020-12-21 21:29:33,623 INFO L153 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2020-12-21 21:29:33,630 INFO L165 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-12-21 21:29:33,658 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-12-21 21:29:33,725 INFO L377 AbstractCegarLoop]: Interprodecural is true [2020-12-21 21:29:33,725 INFO L378 AbstractCegarLoop]: Hoare is true [2020-12-21 21:29:33,725 INFO L379 AbstractCegarLoop]: Compute interpolants for FPandBP [2020-12-21 21:29:33,725 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-12-21 21:29:33,725 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-12-21 21:29:33,726 INFO L382 AbstractCegarLoop]: Difference is false [2020-12-21 21:29:33,726 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-12-21 21:29:33,726 INFO L387 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-12-21 21:29:33,776 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states. [2020-12-21 21:29:33,799 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2020-12-21 21:29:33,799 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:29:33,800 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:29:33,801 INFO L429 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:29:33,820 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:29:33,820 INFO L82 PathProgramCache]: Analyzing trace with hash 1808850128, now seen corresponding path program 1 times [2020-12-21 21:29:33,835 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:29:33,836 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1837090866] [2020-12-21 21:29:33,837 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:29:34,003 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:29:34,080 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-21 21:29:34,081 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1837090866] [2020-12-21 21:29:34,082 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-12-21 21:29:34,083 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-12-21 21:29:34,084 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [56885929] [2020-12-21 21:29:34,089 INFO L461 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-12-21 21:29:34,090 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:29:34,106 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-12-21 21:29:34,107 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-12-21 21:29:34,109 INFO L87 Difference]: Start difference. First operand 14 states. Second operand 3 states. [2020-12-21 21:29:34,139 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:29:34,139 INFO L93 Difference]: Finished difference Result 26 states and 34 transitions. [2020-12-21 21:29:34,141 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-12-21 21:29:34,142 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 7 [2020-12-21 21:29:34,143 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:29:34,153 INFO L225 Difference]: With dead ends: 26 [2020-12-21 21:29:34,153 INFO L226 Difference]: Without dead ends: 11 [2020-12-21 21:29:34,156 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-12-21 21:29:34,177 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 11 states. [2020-12-21 21:29:34,191 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 11 to 11. [2020-12-21 21:29:34,193 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 11 states. [2020-12-21 21:29:34,193 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11 states to 11 states and 12 transitions. [2020-12-21 21:29:34,195 INFO L78 Accepts]: Start accepts. Automaton has 11 states and 12 transitions. Word has length 7 [2020-12-21 21:29:34,195 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:29:34,196 INFO L481 AbstractCegarLoop]: Abstraction has 11 states and 12 transitions. [2020-12-21 21:29:34,196 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-12-21 21:29:34,196 INFO L276 IsEmpty]: Start isEmpty. Operand 11 states and 12 transitions. [2020-12-21 21:29:34,196 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2020-12-21 21:29:34,197 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:29:34,197 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:29:34,197 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-12-21 21:29:34,197 INFO L429 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:29:34,198 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:29:34,198 INFO L82 PathProgramCache]: Analyzing trace with hash 291255051, now seen corresponding path program 1 times [2020-12-21 21:29:34,199 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:29:34,199 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1247375178] [2020-12-21 21:29:34,199 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:29:34,218 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:29:34,274 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-21 21:29:34,275 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1247375178] [2020-12-21 21:29:34,276 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1844025695] [2020-12-21 21:29:34,276 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 [2020-12-21 21:29:34,363 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:29:34,366 INFO L263 TraceCheckSpWp]: Trace formula consists of 52 conjuncts, 3 conjunts are in the unsatisfiable core [2020-12-21 21:29:34,372 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:29:34,462 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-21 21:29:34,462 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:29:34,463 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 5 [2020-12-21 21:29:34,464 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1587588697] [2020-12-21 21:29:34,465 INFO L461 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-12-21 21:29:34,465 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:29:34,466 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-12-21 21:29:34,466 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2020-12-21 21:29:34,467 INFO L87 Difference]: Start difference. First operand 11 states and 12 transitions. Second operand 5 states. [2020-12-21 21:29:34,491 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:29:34,491 INFO L93 Difference]: Finished difference Result 19 states and 21 transitions. [2020-12-21 21:29:34,492 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-12-21 21:29:34,493 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 8 [2020-12-21 21:29:34,493 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:29:34,497 INFO L225 Difference]: With dead ends: 19 [2020-12-21 21:29:34,497 INFO L226 Difference]: Without dead ends: 12 [2020-12-21 21:29:34,498 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2020-12-21 21:29:34,498 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12 states. [2020-12-21 21:29:34,501 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12 to 12. [2020-12-21 21:29:34,501 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 12 states. [2020-12-21 21:29:34,502 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 13 transitions. [2020-12-21 21:29:34,502 INFO L78 Accepts]: Start accepts. Automaton has 12 states and 13 transitions. Word has length 8 [2020-12-21 21:29:34,502 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:29:34,503 INFO L481 AbstractCegarLoop]: Abstraction has 12 states and 13 transitions. [2020-12-21 21:29:34,503 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-12-21 21:29:34,503 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states and 13 transitions. [2020-12-21 21:29:34,503 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2020-12-21 21:29:34,503 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:29:34,504 INFO L422 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:29:34,718 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1 [2020-12-21 21:29:34,719 INFO L429 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:29:34,719 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:29:34,720 INFO L82 PathProgramCache]: Analyzing trace with hash 490447920, now seen corresponding path program 2 times [2020-12-21 21:29:34,720 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:29:34,720 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1210980372] [2020-12-21 21:29:34,721 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:29:34,743 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:29:34,790 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-21 21:29:34,791 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1210980372] [2020-12-21 21:29:34,791 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [773824114] [2020-12-21 21:29:34,792 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 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 [2020-12-21 21:29:34,868 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2020-12-21 21:29:34,869 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 21:29:34,870 INFO L263 TraceCheckSpWp]: Trace formula consists of 56 conjuncts, 4 conjunts are in the unsatisfiable core [2020-12-21 21:29:34,871 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:29:34,914 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-21 21:29:34,915 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:29:34,916 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 6 [2020-12-21 21:29:34,916 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1474132795] [2020-12-21 21:29:34,916 INFO L461 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-12-21 21:29:34,917 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:29:34,917 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-12-21 21:29:34,918 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2020-12-21 21:29:34,918 INFO L87 Difference]: Start difference. First operand 12 states and 13 transitions. Second operand 6 states. [2020-12-21 21:29:34,945 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:29:34,945 INFO L93 Difference]: Finished difference Result 20 states and 22 transitions. [2020-12-21 21:29:34,946 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-12-21 21:29:34,946 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 9 [2020-12-21 21:29:34,946 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:29:34,947 INFO L225 Difference]: With dead ends: 20 [2020-12-21 21:29:34,947 INFO L226 Difference]: Without dead ends: 13 [2020-12-21 21:29:34,948 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2020-12-21 21:29:34,948 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2020-12-21 21:29:34,954 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2020-12-21 21:29:34,955 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 13 states. [2020-12-21 21:29:34,955 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 14 transitions. [2020-12-21 21:29:34,956 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 14 transitions. Word has length 9 [2020-12-21 21:29:34,956 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:29:34,956 INFO L481 AbstractCegarLoop]: Abstraction has 13 states and 14 transitions. [2020-12-21 21:29:34,956 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-12-21 21:29:34,956 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 14 transitions. [2020-12-21 21:29:34,957 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2020-12-21 21:29:34,957 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:29:34,957 INFO L422 BasicCegarLoop]: trace histogram [3, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:29:35,171 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:29:35,173 INFO L429 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:29:35,174 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:29:35,174 INFO L82 PathProgramCache]: Analyzing trace with hash -1924507733, now seen corresponding path program 3 times [2020-12-21 21:29:35,175 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:29:35,175 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [525265458] [2020-12-21 21:29:35,175 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:29:35,206 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:29:35,286 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-21 21:29:35,287 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [525265458] [2020-12-21 21:29:35,287 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1013414946] [2020-12-21 21:29:35,288 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 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 [2020-12-21 21:29:35,357 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2020-12-21 21:29:35,357 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 21:29:35,358 INFO L263 TraceCheckSpWp]: Trace formula consists of 60 conjuncts, 5 conjunts are in the unsatisfiable core [2020-12-21 21:29:35,359 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:29:35,401 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-21 21:29:35,401 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:29:35,402 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 7 [2020-12-21 21:29:35,402 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2082554975] [2020-12-21 21:29:35,403 INFO L461 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-12-21 21:29:35,403 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:29:35,404 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-12-21 21:29:35,404 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2020-12-21 21:29:35,404 INFO L87 Difference]: Start difference. First operand 13 states and 14 transitions. Second operand 7 states. [2020-12-21 21:29:35,423 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:29:35,423 INFO L93 Difference]: Finished difference Result 21 states and 23 transitions. [2020-12-21 21:29:35,424 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-12-21 21:29:35,424 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 10 [2020-12-21 21:29:35,424 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:29:35,425 INFO L225 Difference]: With dead ends: 21 [2020-12-21 21:29:35,425 INFO L226 Difference]: Without dead ends: 14 [2020-12-21 21:29:35,426 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2020-12-21 21:29:35,427 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2020-12-21 21:29:35,429 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2020-12-21 21:29:35,430 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2020-12-21 21:29:35,430 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 15 transitions. [2020-12-21 21:29:35,431 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 15 transitions. Word has length 10 [2020-12-21 21:29:35,431 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:29:35,431 INFO L481 AbstractCegarLoop]: Abstraction has 14 states and 15 transitions. [2020-12-21 21:29:35,431 INFO L482 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-12-21 21:29:35,431 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 15 transitions. [2020-12-21 21:29:35,432 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2020-12-21 21:29:35,432 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:29:35,432 INFO L422 BasicCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:29:35,647 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:29:35,647 INFO L429 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:29:35,649 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:29:35,649 INFO L82 PathProgramCache]: Analyzing trace with hash 521278352, now seen corresponding path program 4 times [2020-12-21 21:29:35,650 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:29:35,650 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [271341154] [2020-12-21 21:29:35,651 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:29:35,668 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:29:35,718 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-21 21:29:35,719 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [271341154] [2020-12-21 21:29:35,719 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1807336419] [2020-12-21 21:29:35,720 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 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 [2020-12-21 21:29:35,776 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2020-12-21 21:29:35,776 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 21:29:35,777 INFO L263 TraceCheckSpWp]: Trace formula consists of 64 conjuncts, 6 conjunts are in the unsatisfiable core [2020-12-21 21:29:35,779 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:29:35,829 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-21 21:29:35,830 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:29:35,830 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 8 [2020-12-21 21:29:35,830 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [62114126] [2020-12-21 21:29:35,831 INFO L461 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-12-21 21:29:35,831 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:29:35,832 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-12-21 21:29:35,833 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=28, Unknown=0, NotChecked=0, Total=56 [2020-12-21 21:29:35,833 INFO L87 Difference]: Start difference. First operand 14 states and 15 transitions. Second operand 8 states. [2020-12-21 21:29:35,883 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:29:35,883 INFO L93 Difference]: Finished difference Result 22 states and 24 transitions. [2020-12-21 21:29:35,884 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-12-21 21:29:35,885 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 11 [2020-12-21 21:29:35,885 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:29:35,886 INFO L225 Difference]: With dead ends: 22 [2020-12-21 21:29:35,888 INFO L226 Difference]: Without dead ends: 15 [2020-12-21 21:29:35,889 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 11 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=28, Invalid=28, Unknown=0, NotChecked=0, Total=56 [2020-12-21 21:29:35,890 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2020-12-21 21:29:35,898 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2020-12-21 21:29:35,898 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2020-12-21 21:29:35,899 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 16 transitions. [2020-12-21 21:29:35,902 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 16 transitions. Word has length 11 [2020-12-21 21:29:35,903 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:29:35,903 INFO L481 AbstractCegarLoop]: Abstraction has 15 states and 16 transitions. [2020-12-21 21:29:35,903 INFO L482 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-12-21 21:29:35,903 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 16 transitions. [2020-12-21 21:29:35,907 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2020-12-21 21:29:35,908 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:29:35,908 INFO L422 BasicCegarLoop]: trace histogram [5, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:29:36,123 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:29:36,125 INFO L429 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:29:36,125 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:29:36,126 INFO L82 PathProgramCache]: Analyzing trace with hash -968764341, now seen corresponding path program 5 times [2020-12-21 21:29:36,126 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:29:36,127 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [701699964] [2020-12-21 21:29:36,129 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:29:36,159 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:29:36,237 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-21 21:29:36,238 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [701699964] [2020-12-21 21:29:36,238 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1275813250] [2020-12-21 21:29:36,238 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 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 [2020-12-21 21:29:36,308 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 4 check-sat command(s) [2020-12-21 21:29:36,308 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 21:29:36,310 INFO L263 TraceCheckSpWp]: Trace formula consists of 68 conjuncts, 7 conjunts are in the unsatisfiable core [2020-12-21 21:29:36,311 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:29:36,361 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-21 21:29:36,362 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:29:36,362 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 9 [2020-12-21 21:29:36,363 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2063254513] [2020-12-21 21:29:36,363 INFO L461 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-12-21 21:29:36,363 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:29:36,364 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-12-21 21:29:36,364 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=36, Unknown=0, NotChecked=0, Total=72 [2020-12-21 21:29:36,365 INFO L87 Difference]: Start difference. First operand 15 states and 16 transitions. Second operand 9 states. [2020-12-21 21:29:36,385 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:29:36,385 INFO L93 Difference]: Finished difference Result 23 states and 25 transitions. [2020-12-21 21:29:36,386 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-12-21 21:29:36,386 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 12 [2020-12-21 21:29:36,386 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:29:36,387 INFO L225 Difference]: With dead ends: 23 [2020-12-21 21:29:36,387 INFO L226 Difference]: Without dead ends: 16 [2020-12-21 21:29:36,388 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 12 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=36, Invalid=36, Unknown=0, NotChecked=0, Total=72 [2020-12-21 21:29:36,388 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2020-12-21 21:29:36,391 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2020-12-21 21:29:36,391 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2020-12-21 21:29:36,392 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 17 transitions. [2020-12-21 21:29:36,392 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 17 transitions. Word has length 12 [2020-12-21 21:29:36,392 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:29:36,393 INFO L481 AbstractCegarLoop]: Abstraction has 16 states and 17 transitions. [2020-12-21 21:29:36,393 INFO L482 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-12-21 21:29:36,393 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 17 transitions. [2020-12-21 21:29:36,393 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-12-21 21:29:36,394 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:29:36,394 INFO L422 BasicCegarLoop]: trace histogram [6, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:29:36,608 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2020-12-21 21:29:36,609 INFO L429 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:29:36,610 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:29:36,610 INFO L82 PathProgramCache]: Analyzing trace with hash 84552432, now seen corresponding path program 6 times [2020-12-21 21:29:36,611 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:29:36,611 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1448235716] [2020-12-21 21:29:36,612 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:29:36,630 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:29:36,713 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-21 21:29:36,713 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1448235716] [2020-12-21 21:29:36,714 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1031754141] [2020-12-21 21:29:36,714 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE 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 [2020-12-21 21:29:36,775 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 4 check-sat command(s) [2020-12-21 21:29:36,775 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 21:29:36,776 INFO L263 TraceCheckSpWp]: Trace formula consists of 72 conjuncts, 8 conjunts are in the unsatisfiable core [2020-12-21 21:29:36,778 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:29:36,836 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-21 21:29:36,836 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:29:36,837 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 10 [2020-12-21 21:29:36,837 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [573801999] [2020-12-21 21:29:36,837 INFO L461 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-12-21 21:29:36,838 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:29:36,838 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-12-21 21:29:36,839 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=45, Unknown=0, NotChecked=0, Total=90 [2020-12-21 21:29:36,839 INFO L87 Difference]: Start difference. First operand 16 states and 17 transitions. Second operand 10 states. [2020-12-21 21:29:36,861 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:29:36,861 INFO L93 Difference]: Finished difference Result 24 states and 26 transitions. [2020-12-21 21:29:36,862 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-12-21 21:29:36,862 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 13 [2020-12-21 21:29:36,862 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:29:36,863 INFO L225 Difference]: With dead ends: 24 [2020-12-21 21:29:36,863 INFO L226 Difference]: Without dead ends: 17 [2020-12-21 21:29:36,864 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 13 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=45, Invalid=45, Unknown=0, NotChecked=0, Total=90 [2020-12-21 21:29:36,864 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2020-12-21 21:29:36,867 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2020-12-21 21:29:36,867 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2020-12-21 21:29:36,868 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 18 transitions. [2020-12-21 21:29:36,868 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 18 transitions. Word has length 13 [2020-12-21 21:29:36,868 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:29:36,868 INFO L481 AbstractCegarLoop]: Abstraction has 17 states and 18 transitions. [2020-12-21 21:29:36,868 INFO L482 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-12-21 21:29:36,869 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 18 transitions. [2020-12-21 21:29:36,869 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-12-21 21:29:36,869 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:29:36,869 INFO L422 BasicCegarLoop]: trace histogram [7, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:29:37,085 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:29:37,085 INFO L429 AbstractCegarLoop]: === Iteration 8 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:29:37,086 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:29:37,087 INFO L82 PathProgramCache]: Analyzing trace with hash -1622365973, now seen corresponding path program 7 times [2020-12-21 21:29:37,087 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:29:37,088 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1315895130] [2020-12-21 21:29:37,088 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:29:37,134 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:29:37,236 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-21 21:29:37,236 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1315895130] [2020-12-21 21:29:37,237 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [702484483] [2020-12-21 21:29:37,237 INFO L93 rtionOrderModulation]: Changing assertion order to 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 [2020-12-21 21:29:37,282 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:29:37,284 INFO L263 TraceCheckSpWp]: Trace formula consists of 76 conjuncts, 9 conjunts are in the unsatisfiable core [2020-12-21 21:29:37,285 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:29:37,333 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-21 21:29:37,334 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:29:37,334 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10] total 11 [2020-12-21 21:29:37,335 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [355831941] [2020-12-21 21:29:37,335 INFO L461 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-12-21 21:29:37,335 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:29:37,336 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-12-21 21:29:37,336 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=55, Unknown=0, NotChecked=0, Total=110 [2020-12-21 21:29:37,336 INFO L87 Difference]: Start difference. First operand 17 states and 18 transitions. Second operand 11 states. [2020-12-21 21:29:37,361 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:29:37,361 INFO L93 Difference]: Finished difference Result 25 states and 27 transitions. [2020-12-21 21:29:37,361 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-12-21 21:29:37,362 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 14 [2020-12-21 21:29:37,362 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:29:37,362 INFO L225 Difference]: With dead ends: 25 [2020-12-21 21:29:37,363 INFO L226 Difference]: Without dead ends: 18 [2020-12-21 21:29:37,363 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=55, Invalid=55, Unknown=0, NotChecked=0, Total=110 [2020-12-21 21:29:37,364 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2020-12-21 21:29:37,366 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2020-12-21 21:29:37,367 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2020-12-21 21:29:37,367 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 19 transitions. [2020-12-21 21:29:37,367 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 19 transitions. Word has length 14 [2020-12-21 21:29:37,368 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:29:37,368 INFO L481 AbstractCegarLoop]: Abstraction has 18 states and 19 transitions. [2020-12-21 21:29:37,368 INFO L482 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-12-21 21:29:37,368 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 19 transitions. [2020-12-21 21:29:37,369 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2020-12-21 21:29:37,369 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:29:37,369 INFO L422 BasicCegarLoop]: trace histogram [8, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:29:37,583 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:29:37,584 INFO L429 AbstractCegarLoop]: === Iteration 9 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:29:37,585 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:29:37,585 INFO L82 PathProgramCache]: Analyzing trace with hash 1297738320, now seen corresponding path program 8 times [2020-12-21 21:29:37,586 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:29:37,586 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1323848317] [2020-12-21 21:29:37,587 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:29:37,604 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:29:37,692 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-21 21:29:37,692 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1323848317] [2020-12-21 21:29:37,693 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [903706343] [2020-12-21 21:29:37,693 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 [2020-12-21 21:29:37,739 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2020-12-21 21:29:37,740 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 21:29:37,741 INFO L263 TraceCheckSpWp]: Trace formula consists of 80 conjuncts, 10 conjunts are in the unsatisfiable core [2020-12-21 21:29:37,743 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:29:37,799 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-21 21:29:37,800 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:29:37,800 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 12 [2020-12-21 21:29:37,801 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [387786549] [2020-12-21 21:29:37,801 INFO L461 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-12-21 21:29:37,801 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:29:37,802 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-12-21 21:29:37,802 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=66, Invalid=66, Unknown=0, NotChecked=0, Total=132 [2020-12-21 21:29:37,802 INFO L87 Difference]: Start difference. First operand 18 states and 19 transitions. Second operand 12 states. [2020-12-21 21:29:37,827 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:29:37,828 INFO L93 Difference]: Finished difference Result 26 states and 28 transitions. [2020-12-21 21:29:37,831 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-12-21 21:29:37,832 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 15 [2020-12-21 21:29:37,832 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:29:37,833 INFO L225 Difference]: With dead ends: 26 [2020-12-21 21:29:37,833 INFO L226 Difference]: Without dead ends: 19 [2020-12-21 21:29:37,834 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 15 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=66, Invalid=66, Unknown=0, NotChecked=0, Total=132 [2020-12-21 21:29:37,834 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2020-12-21 21:29:37,838 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2020-12-21 21:29:37,839 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2020-12-21 21:29:37,839 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 20 transitions. [2020-12-21 21:29:37,839 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 20 transitions. Word has length 15 [2020-12-21 21:29:37,839 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:29:37,840 INFO L481 AbstractCegarLoop]: Abstraction has 19 states and 20 transitions. [2020-12-21 21:29:37,840 INFO L482 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-12-21 21:29:37,840 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 20 transitions. [2020-12-21 21:29:37,840 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-12-21 21:29:37,840 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:29:37,841 INFO L422 BasicCegarLoop]: trace histogram [9, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:29:38,042 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable8 [2020-12-21 21:29:38,043 INFO L429 AbstractCegarLoop]: === Iteration 10 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:29:38,043 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:29:38,044 INFO L82 PathProgramCache]: Analyzing trace with hash 1626658187, now seen corresponding path program 9 times [2020-12-21 21:29:38,044 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:29:38,045 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1125057908] [2020-12-21 21:29:38,045 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:29:38,071 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:29:38,212 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-21 21:29:38,212 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1125057908] [2020-12-21 21:29:38,213 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1946760540] [2020-12-21 21:29:38,213 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 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 [2020-12-21 21:29:38,299 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2020-12-21 21:29:38,300 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 21:29:38,301 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 11 conjunts are in the unsatisfiable core [2020-12-21 21:29:38,302 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:29:38,353 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-21 21:29:38,353 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:29:38,353 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12] total 13 [2020-12-21 21:29:38,354 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1451233025] [2020-12-21 21:29:38,354 INFO L461 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-12-21 21:29:38,354 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:29:38,355 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-12-21 21:29:38,355 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=78, Unknown=0, NotChecked=0, Total=156 [2020-12-21 21:29:38,355 INFO L87 Difference]: Start difference. First operand 19 states and 20 transitions. Second operand 13 states. [2020-12-21 21:29:38,381 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:29:38,381 INFO L93 Difference]: Finished difference Result 27 states and 29 transitions. [2020-12-21 21:29:38,382 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-12-21 21:29:38,382 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 16 [2020-12-21 21:29:38,384 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:29:38,385 INFO L225 Difference]: With dead ends: 27 [2020-12-21 21:29:38,385 INFO L226 Difference]: Without dead ends: 20 [2020-12-21 21:29:38,385 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 16 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=78, Invalid=78, Unknown=0, NotChecked=0, Total=156 [2020-12-21 21:29:38,386 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2020-12-21 21:29:38,388 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2020-12-21 21:29:38,389 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2020-12-21 21:29:38,389 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 21 transitions. [2020-12-21 21:29:38,389 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 21 transitions. Word has length 16 [2020-12-21 21:29:38,390 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:29:38,390 INFO L481 AbstractCegarLoop]: Abstraction has 20 states and 21 transitions. [2020-12-21 21:29:38,390 INFO L482 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-12-21 21:29:38,390 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 21 transitions. [2020-12-21 21:29:38,390 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2020-12-21 21:29:38,391 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:29:38,391 INFO L422 BasicCegarLoop]: trace histogram [10, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:29:38,604 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,10 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:29:38,605 INFO L429 AbstractCegarLoop]: === Iteration 11 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:29:38,606 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:29:38,606 INFO L82 PathProgramCache]: Analyzing trace with hash -1061727824, now seen corresponding path program 10 times [2020-12-21 21:29:38,607 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:29:38,607 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1168802366] [2020-12-21 21:29:38,607 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:29:38,624 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:29:38,744 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-21 21:29:38,745 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1168802366] [2020-12-21 21:29:38,745 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1376239171] [2020-12-21 21:29:38,745 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 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 [2020-12-21 21:29:38,797 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2020-12-21 21:29:38,797 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 21:29:38,798 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 12 conjunts are in the unsatisfiable core [2020-12-21 21:29:38,800 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:29:38,857 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-21 21:29:38,858 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:29:38,858 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13] total 14 [2020-12-21 21:29:38,858 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1784942709] [2020-12-21 21:29:38,859 INFO L461 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-12-21 21:29:38,859 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:29:38,860 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-12-21 21:29:38,861 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=91, Invalid=91, Unknown=0, NotChecked=0, Total=182 [2020-12-21 21:29:38,861 INFO L87 Difference]: Start difference. First operand 20 states and 21 transitions. Second operand 14 states. [2020-12-21 21:29:38,892 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:29:38,892 INFO L93 Difference]: Finished difference Result 28 states and 30 transitions. [2020-12-21 21:29:38,893 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-12-21 21:29:38,893 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 17 [2020-12-21 21:29:38,894 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:29:38,894 INFO L225 Difference]: With dead ends: 28 [2020-12-21 21:29:38,895 INFO L226 Difference]: Without dead ends: 21 [2020-12-21 21:29:38,895 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 17 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=91, Invalid=91, Unknown=0, NotChecked=0, Total=182 [2020-12-21 21:29:38,896 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2020-12-21 21:29:38,902 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2020-12-21 21:29:38,902 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-12-21 21:29:38,903 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 22 transitions. [2020-12-21 21:29:38,903 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 22 transitions. Word has length 17 [2020-12-21 21:29:38,903 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:29:38,903 INFO L481 AbstractCegarLoop]: Abstraction has 21 states and 22 transitions. [2020-12-21 21:29:38,903 INFO L482 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-12-21 21:29:38,903 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 22 transitions. [2020-12-21 21:29:38,904 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2020-12-21 21:29:38,904 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:29:38,904 INFO L422 BasicCegarLoop]: trace histogram [11, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:29:39,117 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,11 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:29:39,118 INFO L429 AbstractCegarLoop]: === Iteration 12 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:29:39,119 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:29:39,119 INFO L82 PathProgramCache]: Analyzing trace with hash 1497651755, now seen corresponding path program 11 times [2020-12-21 21:29:39,120 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:29:39,121 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1472988695] [2020-12-21 21:29:39,121 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:29:39,143 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:29:39,305 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-21 21:29:39,306 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1472988695] [2020-12-21 21:29:39,306 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [358403722] [2020-12-21 21:29:39,306 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 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 [2020-12-21 21:29:39,389 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 7 check-sat command(s) [2020-12-21 21:29:39,390 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 21:29:39,391 INFO L263 TraceCheckSpWp]: Trace formula consists of 92 conjuncts, 13 conjunts are in the unsatisfiable core [2020-12-21 21:29:39,392 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:29:39,468 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-21 21:29:39,469 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:29:39,469 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14] total 15 [2020-12-21 21:29:39,469 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [917143638] [2020-12-21 21:29:39,470 INFO L461 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-12-21 21:29:39,470 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:29:39,471 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-12-21 21:29:39,471 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=105, Invalid=105, Unknown=0, NotChecked=0, Total=210 [2020-12-21 21:29:39,471 INFO L87 Difference]: Start difference. First operand 21 states and 22 transitions. Second operand 15 states. [2020-12-21 21:29:39,498 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:29:39,498 INFO L93 Difference]: Finished difference Result 29 states and 31 transitions. [2020-12-21 21:29:39,498 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-12-21 21:29:39,499 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 18 [2020-12-21 21:29:39,499 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:29:39,499 INFO L225 Difference]: With dead ends: 29 [2020-12-21 21:29:39,499 INFO L226 Difference]: Without dead ends: 22 [2020-12-21 21:29:39,500 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 18 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=105, Invalid=105, Unknown=0, NotChecked=0, Total=210 [2020-12-21 21:29:39,500 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2020-12-21 21:29:39,503 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2020-12-21 21:29:39,503 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2020-12-21 21:29:39,504 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 23 transitions. [2020-12-21 21:29:39,504 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 23 transitions. Word has length 18 [2020-12-21 21:29:39,504 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:29:39,505 INFO L481 AbstractCegarLoop]: Abstraction has 22 states and 23 transitions. [2020-12-21 21:29:39,505 INFO L482 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-12-21 21:29:39,505 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 23 transitions. [2020-12-21 21:29:39,505 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-12-21 21:29:39,505 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:29:39,506 INFO L422 BasicCegarLoop]: trace histogram [12, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:29:39,719 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2020-12-21 21:29:39,720 INFO L429 AbstractCegarLoop]: === Iteration 13 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:29:39,720 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:29:39,721 INFO L82 PathProgramCache]: Analyzing trace with hash -765959920, now seen corresponding path program 12 times [2020-12-21 21:29:39,721 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:29:39,721 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1716036317] [2020-12-21 21:29:39,722 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:29:39,742 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:29:39,942 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 0 proven. 78 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-21 21:29:39,943 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1716036317] [2020-12-21 21:29:39,943 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1392675622] [2020-12-21 21:29:39,943 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE 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 [2020-12-21 21:29:40,066 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2020-12-21 21:29:40,066 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 21:29:40,068 INFO L263 TraceCheckSpWp]: Trace formula consists of 96 conjuncts, 14 conjunts are in the unsatisfiable core [2020-12-21 21:29:40,070 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:29:40,128 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 0 proven. 78 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-21 21:29:40,129 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:29:40,129 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15] total 16 [2020-12-21 21:29:40,132 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [491838049] [2020-12-21 21:29:40,133 INFO L461 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-12-21 21:29:40,133 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:29:40,134 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-12-21 21:29:40,135 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=120, Invalid=120, Unknown=0, NotChecked=0, Total=240 [2020-12-21 21:29:40,135 INFO L87 Difference]: Start difference. First operand 22 states and 23 transitions. Second operand 16 states. [2020-12-21 21:29:40,168 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:29:40,168 INFO L93 Difference]: Finished difference Result 30 states and 32 transitions. [2020-12-21 21:29:40,169 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-12-21 21:29:40,169 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 19 [2020-12-21 21:29:40,171 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:29:40,173 INFO L225 Difference]: With dead ends: 30 [2020-12-21 21:29:40,173 INFO L226 Difference]: Without dead ends: 23 [2020-12-21 21:29:40,174 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 19 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=120, Invalid=120, Unknown=0, NotChecked=0, Total=240 [2020-12-21 21:29:40,174 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2020-12-21 21:29:40,178 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2020-12-21 21:29:40,178 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2020-12-21 21:29:40,179 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 24 transitions. [2020-12-21 21:29:40,179 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 24 transitions. Word has length 19 [2020-12-21 21:29:40,179 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:29:40,179 INFO L481 AbstractCegarLoop]: Abstraction has 23 states and 24 transitions. [2020-12-21 21:29:40,179 INFO L482 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-12-21 21:29:40,179 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 24 transitions. [2020-12-21 21:29:40,180 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-12-21 21:29:40,180 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:29:40,180 INFO L422 BasicCegarLoop]: trace histogram [13, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:29:40,385 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2020-12-21 21:29:40,386 INFO L429 AbstractCegarLoop]: === Iteration 14 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:29:40,387 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:29:40,387 INFO L82 PathProgramCache]: Analyzing trace with hash 2076522187, now seen corresponding path program 13 times [2020-12-21 21:29:40,387 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:29:40,388 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [16498468] [2020-12-21 21:29:40,388 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:29:40,404 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:29:40,569 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 0 proven. 91 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-21 21:29:40,570 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [16498468] [2020-12-21 21:29:40,570 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1301826266] [2020-12-21 21:29:40,570 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY 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 [2020-12-21 21:29:40,617 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:29:40,618 INFO L263 TraceCheckSpWp]: Trace formula consists of 100 conjuncts, 15 conjunts are in the unsatisfiable core [2020-12-21 21:29:40,620 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:29:40,696 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 0 proven. 91 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-21 21:29:40,697 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:29:40,697 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16] total 17 [2020-12-21 21:29:40,697 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [253807657] [2020-12-21 21:29:40,699 INFO L461 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-12-21 21:29:40,699 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:29:40,700 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-12-21 21:29:40,700 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=136, Invalid=136, Unknown=0, NotChecked=0, Total=272 [2020-12-21 21:29:40,700 INFO L87 Difference]: Start difference. First operand 23 states and 24 transitions. Second operand 17 states. [2020-12-21 21:29:40,736 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:29:40,736 INFO L93 Difference]: Finished difference Result 31 states and 33 transitions. [2020-12-21 21:29:40,737 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-12-21 21:29:40,737 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 20 [2020-12-21 21:29:40,737 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:29:40,738 INFO L225 Difference]: With dead ends: 31 [2020-12-21 21:29:40,738 INFO L226 Difference]: Without dead ends: 24 [2020-12-21 21:29:40,738 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=136, Invalid=136, Unknown=0, NotChecked=0, Total=272 [2020-12-21 21:29:40,739 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2020-12-21 21:29:40,742 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2020-12-21 21:29:40,742 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2020-12-21 21:29:40,742 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 25 transitions. [2020-12-21 21:29:40,742 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 25 transitions. Word has length 20 [2020-12-21 21:29:40,743 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:29:40,743 INFO L481 AbstractCegarLoop]: Abstraction has 24 states and 25 transitions. [2020-12-21 21:29:40,743 INFO L482 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-12-21 21:29:40,743 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 25 transitions. [2020-12-21 21:29:40,743 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-12-21 21:29:40,744 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:29:40,744 INFO L422 BasicCegarLoop]: trace histogram [14, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:29:40,958 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2020-12-21 21:29:40,959 INFO L429 AbstractCegarLoop]: === Iteration 15 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:29:40,960 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:29:40,960 INFO L82 PathProgramCache]: Analyzing trace with hash -845712, now seen corresponding path program 14 times [2020-12-21 21:29:40,960 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:29:40,961 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1412114106] [2020-12-21 21:29:40,961 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:29:40,990 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:29:41,199 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 0 proven. 105 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-21 21:29:41,199 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1412114106] [2020-12-21 21:29:41,199 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2098577288] [2020-12-21 21:29:41,199 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 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 [2020-12-21 21:29:41,246 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2020-12-21 21:29:41,246 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 21:29:41,248 INFO L263 TraceCheckSpWp]: Trace formula consists of 104 conjuncts, 16 conjunts are in the unsatisfiable core [2020-12-21 21:29:41,251 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:29:41,337 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 0 proven. 105 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-21 21:29:41,338 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:29:41,338 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17] total 18 [2020-12-21 21:29:41,338 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [118255411] [2020-12-21 21:29:41,340 INFO L461 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-12-21 21:29:41,341 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:29:41,343 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-12-21 21:29:41,343 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=153, Invalid=153, Unknown=0, NotChecked=0, Total=306 [2020-12-21 21:29:41,343 INFO L87 Difference]: Start difference. First operand 24 states and 25 transitions. Second operand 18 states. [2020-12-21 21:29:41,388 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:29:41,389 INFO L93 Difference]: Finished difference Result 32 states and 34 transitions. [2020-12-21 21:29:41,392 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-12-21 21:29:41,393 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 21 [2020-12-21 21:29:41,393 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:29:41,393 INFO L225 Difference]: With dead ends: 32 [2020-12-21 21:29:41,394 INFO L226 Difference]: Without dead ends: 25 [2020-12-21 21:29:41,395 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 26 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=153, Invalid=153, Unknown=0, NotChecked=0, Total=306 [2020-12-21 21:29:41,396 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2020-12-21 21:29:41,405 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2020-12-21 21:29:41,405 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2020-12-21 21:29:41,406 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 26 transitions. [2020-12-21 21:29:41,406 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 26 transitions. Word has length 21 [2020-12-21 21:29:41,406 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:29:41,406 INFO L481 AbstractCegarLoop]: Abstraction has 25 states and 26 transitions. [2020-12-21 21:29:41,406 INFO L482 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-12-21 21:29:41,407 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 26 transitions. [2020-12-21 21:29:41,408 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-12-21 21:29:41,408 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:29:41,409 INFO L422 BasicCegarLoop]: trace histogram [15, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:29:41,622 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14,15 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:29:41,623 INFO L429 AbstractCegarLoop]: === Iteration 16 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:29:41,624 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:29:41,624 INFO L82 PathProgramCache]: Analyzing trace with hash 25258859, now seen corresponding path program 15 times [2020-12-21 21:29:41,624 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:29:41,625 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [229656353] [2020-12-21 21:29:41,625 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:29:41,644 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:29:41,840 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 0 proven. 120 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-21 21:29:41,840 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [229656353] [2020-12-21 21:29:41,843 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2129665708] [2020-12-21 21:29:41,843 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 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 [2020-12-21 21:29:41,967 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2020-12-21 21:29:41,967 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 21:29:41,969 INFO L263 TraceCheckSpWp]: Trace formula consists of 108 conjuncts, 17 conjunts are in the unsatisfiable core [2020-12-21 21:29:41,970 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:29:42,021 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 0 proven. 120 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-21 21:29:42,022 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:29:42,022 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18] total 19 [2020-12-21 21:29:42,022 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [690438958] [2020-12-21 21:29:42,022 INFO L461 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-12-21 21:29:42,023 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:29:42,023 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-12-21 21:29:42,024 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=171, Invalid=171, Unknown=0, NotChecked=0, Total=342 [2020-12-21 21:29:42,024 INFO L87 Difference]: Start difference. First operand 25 states and 26 transitions. Second operand 19 states. [2020-12-21 21:29:42,052 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:29:42,052 INFO L93 Difference]: Finished difference Result 33 states and 35 transitions. [2020-12-21 21:29:42,053 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-12-21 21:29:42,053 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 22 [2020-12-21 21:29:42,053 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:29:42,054 INFO L225 Difference]: With dead ends: 33 [2020-12-21 21:29:42,054 INFO L226 Difference]: Without dead ends: 26 [2020-12-21 21:29:42,055 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 22 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=171, Invalid=171, Unknown=0, NotChecked=0, Total=342 [2020-12-21 21:29:42,055 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2020-12-21 21:29:42,057 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2020-12-21 21:29:42,058 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-12-21 21:29:42,058 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 27 transitions. [2020-12-21 21:29:42,058 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 27 transitions. Word has length 22 [2020-12-21 21:29:42,058 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:29:42,059 INFO L481 AbstractCegarLoop]: Abstraction has 26 states and 27 transitions. [2020-12-21 21:29:42,059 INFO L482 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-12-21 21:29:42,059 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 27 transitions. [2020-12-21 21:29:42,059 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2020-12-21 21:29:42,059 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:29:42,060 INFO L422 BasicCegarLoop]: trace histogram [16, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:29:42,272 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2020-12-21 21:29:42,273 INFO L429 AbstractCegarLoop]: === Iteration 17 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:29:42,274 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:29:42,274 INFO L82 PathProgramCache]: Analyzing trace with hash 834500560, now seen corresponding path program 16 times [2020-12-21 21:29:42,274 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:29:42,275 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [441781097] [2020-12-21 21:29:42,275 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:29:42,288 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:29:42,506 INFO L134 CoverageAnalysis]: Checked inductivity of 136 backedges. 0 proven. 136 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-21 21:29:42,507 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [441781097] [2020-12-21 21:29:42,507 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [166333689] [2020-12-21 21:29:42,507 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 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:29:42,562 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2020-12-21 21:29:42,563 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 21:29:42,564 INFO L263 TraceCheckSpWp]: Trace formula consists of 112 conjuncts, 18 conjunts are in the unsatisfiable core [2020-12-21 21:29:42,566 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:29:42,637 INFO L134 CoverageAnalysis]: Checked inductivity of 136 backedges. 0 proven. 136 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-21 21:29:42,638 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:29:42,638 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19] total 20 [2020-12-21 21:29:42,639 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [503584283] [2020-12-21 21:29:42,640 INFO L461 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-12-21 21:29:42,640 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:29:42,640 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-12-21 21:29:42,641 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=190, Invalid=190, Unknown=0, NotChecked=0, Total=380 [2020-12-21 21:29:42,641 INFO L87 Difference]: Start difference. First operand 26 states and 27 transitions. Second operand 20 states. [2020-12-21 21:29:42,676 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:29:42,676 INFO L93 Difference]: Finished difference Result 34 states and 36 transitions. [2020-12-21 21:29:42,677 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-12-21 21:29:42,677 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 23 [2020-12-21 21:29:42,677 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:29:42,678 INFO L225 Difference]: With dead ends: 34 [2020-12-21 21:29:42,678 INFO L226 Difference]: Without dead ends: 27 [2020-12-21 21:29:42,678 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 23 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=190, Invalid=190, Unknown=0, NotChecked=0, Total=380 [2020-12-21 21:29:42,679 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2020-12-21 21:29:42,682 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2020-12-21 21:29:42,682 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2020-12-21 21:29:42,682 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 28 transitions. [2020-12-21 21:29:42,683 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 28 transitions. Word has length 23 [2020-12-21 21:29:42,683 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:29:42,683 INFO L481 AbstractCegarLoop]: Abstraction has 27 states and 28 transitions. [2020-12-21 21:29:42,683 INFO L482 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-12-21 21:29:42,683 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 28 transitions. [2020-12-21 21:29:42,684 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-12-21 21:29:42,684 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:29:42,684 INFO L422 BasicCegarLoop]: trace histogram [17, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:29:42,899 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2020-12-21 21:29:42,900 INFO L429 AbstractCegarLoop]: === Iteration 18 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:29:42,900 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:29:42,901 INFO L82 PathProgramCache]: Analyzing trace with hash 151189515, now seen corresponding path program 17 times [2020-12-21 21:29:42,901 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:29:42,902 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1728302535] [2020-12-21 21:29:42,902 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:29:42,920 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:29:43,167 INFO L134 CoverageAnalysis]: Checked inductivity of 153 backedges. 0 proven. 153 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-21 21:29:43,168 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1728302535] [2020-12-21 21:29:43,168 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1976604263] [2020-12-21 21:29:43,168 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 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:29:43,318 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 10 check-sat command(s) [2020-12-21 21:29:43,318 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 21:29:43,321 INFO L263 TraceCheckSpWp]: Trace formula consists of 116 conjuncts, 19 conjunts are in the unsatisfiable core [2020-12-21 21:29:43,322 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:29:43,383 INFO L134 CoverageAnalysis]: Checked inductivity of 153 backedges. 0 proven. 153 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-21 21:29:43,384 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:29:43,384 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20] total 21 [2020-12-21 21:29:43,384 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1128005977] [2020-12-21 21:29:43,385 INFO L461 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-12-21 21:29:43,386 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:29:43,387 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-12-21 21:29:43,388 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=210, Invalid=210, Unknown=0, NotChecked=0, Total=420 [2020-12-21 21:29:43,388 INFO L87 Difference]: Start difference. First operand 27 states and 28 transitions. Second operand 21 states. [2020-12-21 21:29:43,423 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:29:43,424 INFO L93 Difference]: Finished difference Result 35 states and 37 transitions. [2020-12-21 21:29:43,424 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2020-12-21 21:29:43,424 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 24 [2020-12-21 21:29:43,425 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:29:43,425 INFO L225 Difference]: With dead ends: 35 [2020-12-21 21:29:43,425 INFO L226 Difference]: Without dead ends: 28 [2020-12-21 21:29:43,426 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 24 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=210, Invalid=210, Unknown=0, NotChecked=0, Total=420 [2020-12-21 21:29:43,426 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2020-12-21 21:29:43,429 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2020-12-21 21:29:43,429 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2020-12-21 21:29:43,430 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 29 transitions. [2020-12-21 21:29:43,430 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 29 transitions. Word has length 24 [2020-12-21 21:29:43,430 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:29:43,430 INFO L481 AbstractCegarLoop]: Abstraction has 28 states and 29 transitions. [2020-12-21 21:29:43,430 INFO L482 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-12-21 21:29:43,430 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 29 transitions. [2020-12-21 21:29:43,431 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-12-21 21:29:43,431 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:29:43,431 INFO L422 BasicCegarLoop]: trace histogram [18, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:29:43,645 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2020-12-21 21:29:43,646 INFO L429 AbstractCegarLoop]: === Iteration 19 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:29:43,646 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:29:43,647 INFO L82 PathProgramCache]: Analyzing trace with hash 443383600, now seen corresponding path program 18 times [2020-12-21 21:29:43,647 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:29:43,647 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [653100140] [2020-12-21 21:29:43,647 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:29:43,661 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:29:43,943 INFO L134 CoverageAnalysis]: Checked inductivity of 171 backedges. 0 proven. 171 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-21 21:29:43,943 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [653100140] [2020-12-21 21:29:43,944 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1014876288] [2020-12-21 21:29:43,944 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:29:44,267 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 10 check-sat command(s) [2020-12-21 21:29:44,267 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 21:29:44,269 INFO L263 TraceCheckSpWp]: Trace formula consists of 120 conjuncts, 20 conjunts are in the unsatisfiable core [2020-12-21 21:29:44,271 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:29:44,373 INFO L134 CoverageAnalysis]: Checked inductivity of 171 backedges. 0 proven. 171 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-21 21:29:44,373 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:29:44,374 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21] total 22 [2020-12-21 21:29:44,374 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1463072851] [2020-12-21 21:29:44,374 INFO L461 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-12-21 21:29:44,374 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:29:44,375 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-12-21 21:29:44,375 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=231, Invalid=231, Unknown=0, NotChecked=0, Total=462 [2020-12-21 21:29:44,376 INFO L87 Difference]: Start difference. First operand 28 states and 29 transitions. Second operand 22 states. [2020-12-21 21:29:44,414 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:29:44,414 INFO L93 Difference]: Finished difference Result 36 states and 38 transitions. [2020-12-21 21:29:44,415 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-12-21 21:29:44,415 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 25 [2020-12-21 21:29:44,416 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:29:44,419 INFO L225 Difference]: With dead ends: 36 [2020-12-21 21:29:44,419 INFO L226 Difference]: Without dead ends: 29 [2020-12-21 21:29:44,419 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 25 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 34 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=231, Invalid=231, Unknown=0, NotChecked=0, Total=462 [2020-12-21 21:29:44,420 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2020-12-21 21:29:44,425 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2020-12-21 21:29:44,425 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2020-12-21 21:29:44,427 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 30 transitions. [2020-12-21 21:29:44,427 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 30 transitions. Word has length 25 [2020-12-21 21:29:44,427 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:29:44,427 INFO L481 AbstractCegarLoop]: Abstraction has 29 states and 30 transitions. [2020-12-21 21:29:44,427 INFO L482 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-12-21 21:29:44,427 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 30 transitions. [2020-12-21 21:29:44,428 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-12-21 21:29:44,428 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:29:44,428 INFO L422 BasicCegarLoop]: trace histogram [19, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:29:44,632 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,19 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:29:44,633 INFO L429 AbstractCegarLoop]: === Iteration 20 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:29:44,633 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:29:44,634 INFO L82 PathProgramCache]: Analyzing trace with hash 911465643, now seen corresponding path program 19 times [2020-12-21 21:29:44,634 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:29:44,634 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1709622947] [2020-12-21 21:29:44,634 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:29:44,651 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:29:44,944 INFO L134 CoverageAnalysis]: Checked inductivity of 190 backedges. 0 proven. 190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-21 21:29:44,945 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1709622947] [2020-12-21 21:29:44,945 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1660559261] [2020-12-21 21:29:44,945 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:29:44,997 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:29:44,998 INFO L263 TraceCheckSpWp]: Trace formula consists of 124 conjuncts, 21 conjunts are in the unsatisfiable core [2020-12-21 21:29:45,011 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:29:45,076 INFO L134 CoverageAnalysis]: Checked inductivity of 190 backedges. 0 proven. 190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-21 21:29:45,077 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:29:45,077 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22] total 23 [2020-12-21 21:29:45,077 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1068724670] [2020-12-21 21:29:45,079 INFO L461 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-12-21 21:29:45,080 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:29:45,080 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-12-21 21:29:45,081 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=253, Invalid=253, Unknown=0, NotChecked=0, Total=506 [2020-12-21 21:29:45,081 INFO L87 Difference]: Start difference. First operand 29 states and 30 transitions. Second operand 23 states. [2020-12-21 21:29:45,112 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:29:45,112 INFO L93 Difference]: Finished difference Result 37 states and 39 transitions. [2020-12-21 21:29:45,113 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-12-21 21:29:45,113 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 26 [2020-12-21 21:29:45,113 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:29:45,114 INFO L225 Difference]: With dead ends: 37 [2020-12-21 21:29:45,114 INFO L226 Difference]: Without dead ends: 30 [2020-12-21 21:29:45,115 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 26 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 36 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=253, Invalid=253, Unknown=0, NotChecked=0, Total=506 [2020-12-21 21:29:45,115 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-12-21 21:29:45,118 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2020-12-21 21:29:45,118 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-12-21 21:29:45,118 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 31 transitions. [2020-12-21 21:29:45,118 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 31 transitions. Word has length 26 [2020-12-21 21:29:45,119 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:29:45,119 INFO L481 AbstractCegarLoop]: Abstraction has 30 states and 31 transitions. [2020-12-21 21:29:45,119 INFO L482 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-12-21 21:29:45,119 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 31 transitions. [2020-12-21 21:29:45,120 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-12-21 21:29:45,120 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:29:45,120 INFO L422 BasicCegarLoop]: trace histogram [20, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:29:45,333 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,20 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:29:45,334 INFO L429 AbstractCegarLoop]: === Iteration 21 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:29:45,334 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:29:45,335 INFO L82 PathProgramCache]: Analyzing trace with hash -1757860208, now seen corresponding path program 20 times [2020-12-21 21:29:45,335 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:29:45,335 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1057789830] [2020-12-21 21:29:45,335 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:29:45,353 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:29:45,713 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-21 21:29:45,714 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1057789830] [2020-12-21 21:29:45,714 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [217531522] [2020-12-21 21:29:45,714 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 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:29:45,773 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2020-12-21 21:29:45,773 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 21:29:45,774 INFO L263 TraceCheckSpWp]: Trace formula consists of 128 conjuncts, 22 conjunts are in the unsatisfiable core [2020-12-21 21:29:45,779 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:29:45,851 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-21 21:29:45,851 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:29:45,851 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23] total 24 [2020-12-21 21:29:45,852 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [238817822] [2020-12-21 21:29:45,854 INFO L461 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-12-21 21:29:45,854 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:29:45,855 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-12-21 21:29:45,855 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=276, Invalid=276, Unknown=0, NotChecked=0, Total=552 [2020-12-21 21:29:45,855 INFO L87 Difference]: Start difference. First operand 30 states and 31 transitions. Second operand 24 states. [2020-12-21 21:29:45,899 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:29:45,899 INFO L93 Difference]: Finished difference Result 38 states and 40 transitions. [2020-12-21 21:29:45,900 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2020-12-21 21:29:45,900 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 27 [2020-12-21 21:29:45,900 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:29:45,901 INFO L225 Difference]: With dead ends: 38 [2020-12-21 21:29:45,901 INFO L226 Difference]: Without dead ends: 31 [2020-12-21 21:29:45,902 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 27 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 38 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=276, Invalid=276, Unknown=0, NotChecked=0, Total=552 [2020-12-21 21:29:45,902 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2020-12-21 21:29:45,904 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 31. [2020-12-21 21:29:45,905 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-12-21 21:29:45,905 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 32 transitions. [2020-12-21 21:29:45,905 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 32 transitions. Word has length 27 [2020-12-21 21:29:45,906 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:29:45,906 INFO L481 AbstractCegarLoop]: Abstraction has 31 states and 32 transitions. [2020-12-21 21:29:45,906 INFO L482 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-12-21 21:29:45,906 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 32 transitions. [2020-12-21 21:29:45,906 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-12-21 21:29:45,906 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:29:45,907 INFO L422 BasicCegarLoop]: trace histogram [21, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:29:46,121 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable20 [2020-12-21 21:29:46,122 INFO L429 AbstractCegarLoop]: === Iteration 22 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:29:46,122 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:29:46,123 INFO L82 PathProgramCache]: Analyzing trace with hash 1392384331, now seen corresponding path program 21 times [2020-12-21 21:29:46,123 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:29:46,123 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [497566132] [2020-12-21 21:29:46,123 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:29:46,140 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:29:46,494 INFO L134 CoverageAnalysis]: Checked inductivity of 231 backedges. 0 proven. 231 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-21 21:29:46,495 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [497566132] [2020-12-21 21:29:46,495 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [870442732] [2020-12-21 21:29:46,495 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 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:29:47,105 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 12 check-sat command(s) [2020-12-21 21:29:47,106 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 21:29:47,109 INFO L263 TraceCheckSpWp]: Trace formula consists of 132 conjuncts, 23 conjunts are in the unsatisfiable core [2020-12-21 21:29:47,110 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:29:47,168 INFO L134 CoverageAnalysis]: Checked inductivity of 231 backedges. 0 proven. 231 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-21 21:29:47,169 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:29:47,169 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24] total 25 [2020-12-21 21:29:47,169 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [841408054] [2020-12-21 21:29:47,170 INFO L461 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-12-21 21:29:47,170 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:29:47,170 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-12-21 21:29:47,171 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=300, Invalid=300, Unknown=0, NotChecked=0, Total=600 [2020-12-21 21:29:47,171 INFO L87 Difference]: Start difference. First operand 31 states and 32 transitions. Second operand 25 states. [2020-12-21 21:29:47,210 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:29:47,212 INFO L93 Difference]: Finished difference Result 39 states and 41 transitions. [2020-12-21 21:29:47,212 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2020-12-21 21:29:47,213 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 28 [2020-12-21 21:29:47,213 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:29:47,213 INFO L225 Difference]: With dead ends: 39 [2020-12-21 21:29:47,213 INFO L226 Difference]: Without dead ends: 32 [2020-12-21 21:29:47,214 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 51 GetRequests, 28 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=300, Invalid=300, Unknown=0, NotChecked=0, Total=600 [2020-12-21 21:29:47,215 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-12-21 21:29:47,218 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32. [2020-12-21 21:29:47,218 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2020-12-21 21:29:47,220 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 33 transitions. [2020-12-21 21:29:47,221 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 33 transitions. Word has length 28 [2020-12-21 21:29:47,221 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:29:47,221 INFO L481 AbstractCegarLoop]: Abstraction has 32 states and 33 transitions. [2020-12-21 21:29:47,221 INFO L482 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-12-21 21:29:47,221 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 33 transitions. [2020-12-21 21:29:47,223 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2020-12-21 21:29:47,223 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:29:47,224 INFO L422 BasicCegarLoop]: trace histogram [22, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:29:47,436 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable21 [2020-12-21 21:29:47,437 INFO L429 AbstractCegarLoop]: === Iteration 23 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:29:47,437 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:29:47,438 INFO L82 PathProgramCache]: Analyzing trace with hash 265717232, now seen corresponding path program 22 times [2020-12-21 21:29:47,438 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:29:47,438 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1345069356] [2020-12-21 21:29:47,438 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:29:47,454 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:29:47,847 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-21 21:29:47,847 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1345069356] [2020-12-21 21:29:47,847 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [778157514] [2020-12-21 21:29:47,847 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 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:29:47,907 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2020-12-21 21:29:47,907 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 21:29:47,908 INFO L263 TraceCheckSpWp]: Trace formula consists of 136 conjuncts, 24 conjunts are in the unsatisfiable core [2020-12-21 21:29:47,918 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:29:47,984 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-21 21:29:47,985 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:29:47,985 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25] total 26 [2020-12-21 21:29:47,986 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1603219115] [2020-12-21 21:29:47,986 INFO L461 AbstractCegarLoop]: Interpolant automaton has 26 states [2020-12-21 21:29:47,986 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:29:47,987 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2020-12-21 21:29:47,987 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=325, Invalid=325, Unknown=0, NotChecked=0, Total=650 [2020-12-21 21:29:47,988 INFO L87 Difference]: Start difference. First operand 32 states and 33 transitions. Second operand 26 states. [2020-12-21 21:29:48,033 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:29:48,033 INFO L93 Difference]: Finished difference Result 40 states and 42 transitions. [2020-12-21 21:29:48,034 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2020-12-21 21:29:48,034 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 29 [2020-12-21 21:29:48,034 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:29:48,035 INFO L225 Difference]: With dead ends: 40 [2020-12-21 21:29:48,035 INFO L226 Difference]: Without dead ends: 33 [2020-12-21 21:29:48,035 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 29 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 42 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=325, Invalid=325, Unknown=0, NotChecked=0, Total=650 [2020-12-21 21:29:48,037 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2020-12-21 21:29:48,042 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2020-12-21 21:29:48,042 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2020-12-21 21:29:48,044 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 34 transitions. [2020-12-21 21:29:48,044 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 34 transitions. Word has length 29 [2020-12-21 21:29:48,044 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:29:48,044 INFO L481 AbstractCegarLoop]: Abstraction has 33 states and 34 transitions. [2020-12-21 21:29:48,045 INFO L482 AbstractCegarLoop]: Interpolant automaton has 26 states. [2020-12-21 21:29:48,045 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 34 transitions. [2020-12-21 21:29:48,045 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2020-12-21 21:29:48,045 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:29:48,045 INFO L422 BasicCegarLoop]: trace histogram [23, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:29:48,258 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22,23 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:29:48,259 INFO L429 AbstractCegarLoop]: === Iteration 24 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:29:48,259 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:29:48,259 INFO L82 PathProgramCache]: Analyzing trace with hash -301224469, now seen corresponding path program 23 times [2020-12-21 21:29:48,260 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:29:48,260 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1050259332] [2020-12-21 21:29:48,260 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:29:48,276 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:29:48,642 INFO L134 CoverageAnalysis]: Checked inductivity of 276 backedges. 0 proven. 276 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-21 21:29:48,643 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1050259332] [2020-12-21 21:29:48,643 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [814849307] [2020-12-21 21:29:48,643 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 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:29:48,977 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 13 check-sat command(s) [2020-12-21 21:29:48,977 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 21:29:48,980 INFO L263 TraceCheckSpWp]: Trace formula consists of 140 conjuncts, 25 conjunts are in the unsatisfiable core [2020-12-21 21:29:48,981 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:29:49,050 INFO L134 CoverageAnalysis]: Checked inductivity of 276 backedges. 0 proven. 276 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-21 21:29:49,051 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:29:49,051 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26] total 27 [2020-12-21 21:29:49,051 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2046283127] [2020-12-21 21:29:49,051 INFO L461 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-12-21 21:29:49,052 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:29:49,052 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-12-21 21:29:49,053 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=351, Invalid=351, Unknown=0, NotChecked=0, Total=702 [2020-12-21 21:29:49,053 INFO L87 Difference]: Start difference. First operand 33 states and 34 transitions. Second operand 27 states. [2020-12-21 21:29:49,094 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:29:49,094 INFO L93 Difference]: Finished difference Result 41 states and 43 transitions. [2020-12-21 21:29:49,095 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2020-12-21 21:29:49,095 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 30 [2020-12-21 21:29:49,095 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:29:49,095 INFO L225 Difference]: With dead ends: 41 [2020-12-21 21:29:49,096 INFO L226 Difference]: Without dead ends: 34 [2020-12-21 21:29:49,096 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 30 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 44 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=351, Invalid=351, Unknown=0, NotChecked=0, Total=702 [2020-12-21 21:29:49,096 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2020-12-21 21:29:49,099 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 34. [2020-12-21 21:29:49,100 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2020-12-21 21:29:49,100 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 35 transitions. [2020-12-21 21:29:49,100 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 35 transitions. Word has length 30 [2020-12-21 21:29:49,100 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:29:49,100 INFO L481 AbstractCegarLoop]: Abstraction has 34 states and 35 transitions. [2020-12-21 21:29:49,101 INFO L482 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-12-21 21:29:49,101 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 35 transitions. [2020-12-21 21:29:49,101 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2020-12-21 21:29:49,101 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:29:49,101 INFO L422 BasicCegarLoop]: trace histogram [24, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:29:49,314 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable23 [2020-12-21 21:29:49,315 INFO L429 AbstractCegarLoop]: === Iteration 25 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:29:49,315 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:29:49,315 INFO L82 PathProgramCache]: Analyzing trace with hash -696548016, now seen corresponding path program 24 times [2020-12-21 21:29:49,316 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:29:49,316 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [556176499] [2020-12-21 21:29:49,316 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:29:49,332 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:29:49,765 INFO L134 CoverageAnalysis]: Checked inductivity of 300 backedges. 0 proven. 300 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-21 21:29:49,766 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [556176499] [2020-12-21 21:29:49,766 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1328867787] [2020-12-21 21:29:49,766 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:29:51,208 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 13 check-sat command(s) [2020-12-21 21:29:51,208 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 21:29:51,217 INFO L263 TraceCheckSpWp]: Trace formula consists of 144 conjuncts, 26 conjunts are in the unsatisfiable core [2020-12-21 21:29:51,218 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:29:51,275 INFO L134 CoverageAnalysis]: Checked inductivity of 300 backedges. 0 proven. 300 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-21 21:29:51,275 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:29:51,275 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 27] total 28 [2020-12-21 21:29:51,276 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1725675838] [2020-12-21 21:29:51,276 INFO L461 AbstractCegarLoop]: Interpolant automaton has 28 states [2020-12-21 21:29:51,276 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:29:51,277 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2020-12-21 21:29:51,277 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=378, Invalid=378, Unknown=0, NotChecked=0, Total=756 [2020-12-21 21:29:51,277 INFO L87 Difference]: Start difference. First operand 34 states and 35 transitions. Second operand 28 states. [2020-12-21 21:29:51,322 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:29:51,322 INFO L93 Difference]: Finished difference Result 42 states and 44 transitions. [2020-12-21 21:29:51,322 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2020-12-21 21:29:51,323 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 31 [2020-12-21 21:29:51,323 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:29:51,323 INFO L225 Difference]: With dead ends: 42 [2020-12-21 21:29:51,323 INFO L226 Difference]: Without dead ends: 35 [2020-12-21 21:29:51,324 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 31 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 46 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=378, Invalid=378, Unknown=0, NotChecked=0, Total=756 [2020-12-21 21:29:51,324 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2020-12-21 21:29:51,327 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 35. [2020-12-21 21:29:51,327 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-12-21 21:29:51,327 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 36 transitions. [2020-12-21 21:29:51,327 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 36 transitions. Word has length 31 [2020-12-21 21:29:51,328 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:29:51,328 INFO L481 AbstractCegarLoop]: Abstraction has 35 states and 36 transitions. [2020-12-21 21:29:51,328 INFO L482 AbstractCegarLoop]: Interpolant automaton has 28 states. [2020-12-21 21:29:51,328 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 36 transitions. [2020-12-21 21:29:51,328 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2020-12-21 21:29:51,328 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:29:51,328 INFO L422 BasicCegarLoop]: trace histogram [25, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:29:51,541 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24,25 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:29:51,542 INFO L429 AbstractCegarLoop]: === Iteration 26 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:29:51,542 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:29:51,543 INFO L82 PathProgramCache]: Analyzing trace with hash -66676085, now seen corresponding path program 25 times [2020-12-21 21:29:51,543 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:29:51,543 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [716134080] [2020-12-21 21:29:51,544 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:29:51,573 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:29:52,020 INFO L134 CoverageAnalysis]: Checked inductivity of 325 backedges. 0 proven. 325 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-21 21:29:52,020 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [716134080] [2020-12-21 21:29:52,025 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [280973615] [2020-12-21 21:29:52,025 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:29:52,082 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:29:52,083 INFO L263 TraceCheckSpWp]: Trace formula consists of 148 conjuncts, 27 conjunts are in the unsatisfiable core [2020-12-21 21:29:52,084 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:29:52,142 INFO L134 CoverageAnalysis]: Checked inductivity of 325 backedges. 0 proven. 325 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-21 21:29:52,143 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:29:52,143 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 28] total 29 [2020-12-21 21:29:52,143 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2132551490] [2020-12-21 21:29:52,144 INFO L461 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-12-21 21:29:52,144 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:29:52,144 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-12-21 21:29:52,145 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=406, Invalid=406, Unknown=0, NotChecked=0, Total=812 [2020-12-21 21:29:52,145 INFO L87 Difference]: Start difference. First operand 35 states and 36 transitions. Second operand 29 states. [2020-12-21 21:29:52,192 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:29:52,192 INFO L93 Difference]: Finished difference Result 43 states and 45 transitions. [2020-12-21 21:29:52,192 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2020-12-21 21:29:52,193 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 32 [2020-12-21 21:29:52,193 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:29:52,193 INFO L225 Difference]: With dead ends: 43 [2020-12-21 21:29:52,193 INFO L226 Difference]: Without dead ends: 36 [2020-12-21 21:29:52,194 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 59 GetRequests, 32 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 48 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=406, Invalid=406, Unknown=0, NotChecked=0, Total=812 [2020-12-21 21:29:52,195 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2020-12-21 21:29:52,197 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2020-12-21 21:29:52,197 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-12-21 21:29:52,198 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 37 transitions. [2020-12-21 21:29:52,198 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 37 transitions. Word has length 32 [2020-12-21 21:29:52,198 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:29:52,198 INFO L481 AbstractCegarLoop]: Abstraction has 36 states and 37 transitions. [2020-12-21 21:29:52,198 INFO L482 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-12-21 21:29:52,198 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 37 transitions. [2020-12-21 21:29:52,199 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2020-12-21 21:29:52,199 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:29:52,199 INFO L422 BasicCegarLoop]: trace histogram [26, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:29:52,412 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable25 [2020-12-21 21:29:52,413 INFO L429 AbstractCegarLoop]: === Iteration 27 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:29:52,413 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:29:52,413 INFO L82 PathProgramCache]: Analyzing trace with hash -2015482704, now seen corresponding path program 26 times [2020-12-21 21:29:52,414 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:29:52,414 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [379336629] [2020-12-21 21:29:52,414 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:29:52,431 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:29:52,910 INFO L134 CoverageAnalysis]: Checked inductivity of 351 backedges. 0 proven. 351 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-21 21:29:52,911 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [379336629] [2020-12-21 21:29:52,911 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1757675580] [2020-12-21 21:29:52,911 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 27 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 27 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:29:52,970 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2020-12-21 21:29:52,970 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 21:29:52,972 INFO L263 TraceCheckSpWp]: Trace formula consists of 152 conjuncts, 28 conjunts are in the unsatisfiable core [2020-12-21 21:29:52,973 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:29:53,030 INFO L134 CoverageAnalysis]: Checked inductivity of 351 backedges. 0 proven. 351 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-21 21:29:53,031 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:29:53,031 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 29] total 30 [2020-12-21 21:29:53,031 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1174870669] [2020-12-21 21:29:53,032 INFO L461 AbstractCegarLoop]: Interpolant automaton has 30 states [2020-12-21 21:29:53,033 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:29:53,033 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2020-12-21 21:29:53,034 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=435, Invalid=435, Unknown=0, NotChecked=0, Total=870 [2020-12-21 21:29:53,034 INFO L87 Difference]: Start difference. First operand 36 states and 37 transitions. Second operand 30 states. [2020-12-21 21:29:53,080 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:29:53,080 INFO L93 Difference]: Finished difference Result 44 states and 46 transitions. [2020-12-21 21:29:53,081 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2020-12-21 21:29:53,081 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 33 [2020-12-21 21:29:53,081 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:29:53,081 INFO L225 Difference]: With dead ends: 44 [2020-12-21 21:29:53,081 INFO L226 Difference]: Without dead ends: 37 [2020-12-21 21:29:53,083 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 33 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 50 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=435, Invalid=435, Unknown=0, NotChecked=0, Total=870 [2020-12-21 21:29:53,084 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2020-12-21 21:29:53,091 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37. [2020-12-21 21:29:53,091 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2020-12-21 21:29:53,091 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 38 transitions. [2020-12-21 21:29:53,091 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 38 transitions. Word has length 33 [2020-12-21 21:29:53,092 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:29:53,092 INFO L481 AbstractCegarLoop]: Abstraction has 37 states and 38 transitions. [2020-12-21 21:29:53,092 INFO L482 AbstractCegarLoop]: Interpolant automaton has 30 states. [2020-12-21 21:29:53,092 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 38 transitions. [2020-12-21 21:29:53,092 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2020-12-21 21:29:53,092 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:29:53,092 INFO L422 BasicCegarLoop]: trace histogram [27, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:29:53,304 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable26 [2020-12-21 21:29:53,305 INFO L429 AbstractCegarLoop]: === Iteration 28 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:29:53,305 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:29:53,306 INFO L82 PathProgramCache]: Analyzing trace with hash 1996021547, now seen corresponding path program 27 times [2020-12-21 21:29:53,306 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:29:53,306 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [539011636] [2020-12-21 21:29:53,307 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:29:53,328 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:29:53,842 INFO L134 CoverageAnalysis]: Checked inductivity of 378 backedges. 0 proven. 378 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-21 21:29:53,843 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [539011636] [2020-12-21 21:29:53,843 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1342733562] [2020-12-21 21:29:53,843 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 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:29:58,403 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 15 check-sat command(s) [2020-12-21 21:29:58,404 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 21:29:58,418 INFO L263 TraceCheckSpWp]: Trace formula consists of 156 conjuncts, 29 conjunts are in the unsatisfiable core [2020-12-21 21:29:58,419 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:29:58,484 INFO L134 CoverageAnalysis]: Checked inductivity of 378 backedges. 0 proven. 378 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-21 21:29:58,484 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:29:58,484 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 30] total 31 [2020-12-21 21:29:58,485 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [957010363] [2020-12-21 21:29:58,485 INFO L461 AbstractCegarLoop]: Interpolant automaton has 31 states [2020-12-21 21:29:58,485 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:29:58,486 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2020-12-21 21:29:58,486 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=465, Invalid=465, Unknown=0, NotChecked=0, Total=930 [2020-12-21 21:29:58,486 INFO L87 Difference]: Start difference. First operand 37 states and 38 transitions. Second operand 31 states. [2020-12-21 21:29:58,535 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:29:58,535 INFO L93 Difference]: Finished difference Result 45 states and 47 transitions. [2020-12-21 21:29:58,535 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2020-12-21 21:29:58,536 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 34 [2020-12-21 21:29:58,536 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:29:58,536 INFO L225 Difference]: With dead ends: 45 [2020-12-21 21:29:58,536 INFO L226 Difference]: Without dead ends: 38 [2020-12-21 21:29:58,537 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 63 GetRequests, 34 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 52 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=465, Invalid=465, Unknown=0, NotChecked=0, Total=930 [2020-12-21 21:29:58,537 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-12-21 21:29:58,540 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 38. [2020-12-21 21:29:58,540 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2020-12-21 21:29:58,540 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 39 transitions. [2020-12-21 21:29:58,540 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 39 transitions. Word has length 34 [2020-12-21 21:29:58,541 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:29:58,541 INFO L481 AbstractCegarLoop]: Abstraction has 38 states and 39 transitions. [2020-12-21 21:29:58,541 INFO L482 AbstractCegarLoop]: Interpolant automaton has 31 states. [2020-12-21 21:29:58,541 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 39 transitions. [2020-12-21 21:29:58,541 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2020-12-21 21:29:58,541 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:29:58,542 INFO L422 BasicCegarLoop]: trace histogram [28, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:29:58,757 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable27 [2020-12-21 21:29:58,757 INFO L429 AbstractCegarLoop]: === Iteration 29 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:29:58,758 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:29:58,758 INFO L82 PathProgramCache]: Analyzing trace with hash 1798601744, now seen corresponding path program 28 times [2020-12-21 21:29:58,758 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:29:58,758 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1772102748] [2020-12-21 21:29:58,758 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:29:58,778 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:29:59,340 INFO L134 CoverageAnalysis]: Checked inductivity of 406 backedges. 0 proven. 406 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-21 21:29:59,341 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1772102748] [2020-12-21 21:29:59,341 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1017517792] [2020-12-21 21:29:59,341 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 29 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 29 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:29:59,400 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2020-12-21 21:29:59,401 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 21:29:59,402 INFO L263 TraceCheckSpWp]: Trace formula consists of 160 conjuncts, 30 conjunts are in the unsatisfiable core [2020-12-21 21:29:59,403 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:29:59,476 INFO L134 CoverageAnalysis]: Checked inductivity of 406 backedges. 0 proven. 406 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-21 21:29:59,477 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:29:59,477 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 31] total 32 [2020-12-21 21:29:59,477 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1671104582] [2020-12-21 21:29:59,478 INFO L461 AbstractCegarLoop]: Interpolant automaton has 32 states [2020-12-21 21:29:59,478 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:29:59,478 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2020-12-21 21:29:59,479 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=496, Invalid=496, Unknown=0, NotChecked=0, Total=992 [2020-12-21 21:29:59,479 INFO L87 Difference]: Start difference. First operand 38 states and 39 transitions. Second operand 32 states. [2020-12-21 21:29:59,524 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:29:59,524 INFO L93 Difference]: Finished difference Result 46 states and 48 transitions. [2020-12-21 21:29:59,525 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2020-12-21 21:29:59,525 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 35 [2020-12-21 21:29:59,525 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:29:59,525 INFO L225 Difference]: With dead ends: 46 [2020-12-21 21:29:59,525 INFO L226 Difference]: Without dead ends: 39 [2020-12-21 21:29:59,526 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 35 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 54 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=496, Invalid=496, Unknown=0, NotChecked=0, Total=992 [2020-12-21 21:29:59,526 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2020-12-21 21:29:59,529 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2020-12-21 21:29:59,529 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2020-12-21 21:29:59,529 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 40 transitions. [2020-12-21 21:29:59,529 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 40 transitions. Word has length 35 [2020-12-21 21:29:59,530 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:29:59,530 INFO L481 AbstractCegarLoop]: Abstraction has 39 states and 40 transitions. [2020-12-21 21:29:59,530 INFO L482 AbstractCegarLoop]: Interpolant automaton has 32 states. [2020-12-21 21:29:59,530 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 40 transitions. [2020-12-21 21:29:59,530 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2020-12-21 21:29:59,530 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:29:59,531 INFO L422 BasicCegarLoop]: trace histogram [29, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:29:59,745 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 29 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable28 [2020-12-21 21:29:59,745 INFO L429 AbstractCegarLoop]: === Iteration 30 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:29:59,746 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:29:59,746 INFO L82 PathProgramCache]: Analyzing trace with hash -26444853, now seen corresponding path program 29 times [2020-12-21 21:29:59,746 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:29:59,746 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1388756253] [2020-12-21 21:29:59,746 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:29:59,764 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:30:00,395 INFO L134 CoverageAnalysis]: Checked inductivity of 435 backedges. 0 proven. 435 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-21 21:30:00,395 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1388756253] [2020-12-21 21:30:00,396 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [130233238] [2020-12-21 21:30:00,396 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 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:30:01,045 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 16 check-sat command(s) [2020-12-21 21:30:01,045 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 21:30:01,050 INFO L263 TraceCheckSpWp]: Trace formula consists of 164 conjuncts, 31 conjunts are in the unsatisfiable core [2020-12-21 21:30:01,051 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:30:01,129 INFO L134 CoverageAnalysis]: Checked inductivity of 435 backedges. 0 proven. 435 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-21 21:30:01,129 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:30:01,129 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 32] total 33 [2020-12-21 21:30:01,129 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1870544926] [2020-12-21 21:30:01,130 INFO L461 AbstractCegarLoop]: Interpolant automaton has 33 states [2020-12-21 21:30:01,130 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:30:01,131 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2020-12-21 21:30:01,131 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=528, Invalid=528, Unknown=0, NotChecked=0, Total=1056 [2020-12-21 21:30:01,131 INFO L87 Difference]: Start difference. First operand 39 states and 40 transitions. Second operand 33 states. [2020-12-21 21:30:01,182 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:30:01,182 INFO L93 Difference]: Finished difference Result 47 states and 49 transitions. [2020-12-21 21:30:01,183 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2020-12-21 21:30:01,183 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 36 [2020-12-21 21:30:01,183 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:30:01,183 INFO L225 Difference]: With dead ends: 47 [2020-12-21 21:30:01,183 INFO L226 Difference]: Without dead ends: 40 [2020-12-21 21:30:01,184 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 67 GetRequests, 36 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 56 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=528, Invalid=528, Unknown=0, NotChecked=0, Total=1056 [2020-12-21 21:30:01,184 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2020-12-21 21:30:01,186 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 40. [2020-12-21 21:30:01,187 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2020-12-21 21:30:01,187 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 41 transitions. [2020-12-21 21:30:01,187 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 41 transitions. Word has length 36 [2020-12-21 21:30:01,187 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:30:01,187 INFO L481 AbstractCegarLoop]: Abstraction has 40 states and 41 transitions. [2020-12-21 21:30:01,187 INFO L482 AbstractCegarLoop]: Interpolant automaton has 33 states. [2020-12-21 21:30:01,187 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 41 transitions. [2020-12-21 21:30:01,188 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2020-12-21 21:30:01,188 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:30:01,188 INFO L422 BasicCegarLoop]: trace histogram [30, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:30:01,402 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29,30 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:30:01,403 INFO L429 AbstractCegarLoop]: === Iteration 31 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:30:01,403 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:30:01,403 INFO L82 PathProgramCache]: Analyzing trace with hash -768314512, now seen corresponding path program 30 times [2020-12-21 21:30:01,404 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:30:01,404 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1247353337] [2020-12-21 21:30:01,404 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:30:01,419 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:30:02,072 INFO L134 CoverageAnalysis]: Checked inductivity of 465 backedges. 0 proven. 465 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-21 21:30:02,072 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1247353337] [2020-12-21 21:30:02,072 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1441517319] [2020-12-21 21:30:02,073 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 31 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 31 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:30:03,946 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 16 check-sat command(s) [2020-12-21 21:30:03,946 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 21:30:03,954 INFO L263 TraceCheckSpWp]: Trace formula consists of 168 conjuncts, 32 conjunts are in the unsatisfiable core [2020-12-21 21:30:03,955 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:30:04,014 INFO L134 CoverageAnalysis]: Checked inductivity of 465 backedges. 0 proven. 465 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-21 21:30:04,015 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:30:04,015 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 33] total 34 [2020-12-21 21:30:04,015 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [473100666] [2020-12-21 21:30:04,015 INFO L461 AbstractCegarLoop]: Interpolant automaton has 34 states [2020-12-21 21:30:04,015 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:30:04,016 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2020-12-21 21:30:04,016 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=561, Invalid=561, Unknown=0, NotChecked=0, Total=1122 [2020-12-21 21:30:04,017 INFO L87 Difference]: Start difference. First operand 40 states and 41 transitions. Second operand 34 states. [2020-12-21 21:30:04,060 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:30:04,060 INFO L93 Difference]: Finished difference Result 48 states and 50 transitions. [2020-12-21 21:30:04,061 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2020-12-21 21:30:04,061 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 37 [2020-12-21 21:30:04,061 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:30:04,062 INFO L225 Difference]: With dead ends: 48 [2020-12-21 21:30:04,062 INFO L226 Difference]: Without dead ends: 41 [2020-12-21 21:30:04,063 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 69 GetRequests, 37 SyntacticMatches, 0 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 58 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=561, Invalid=561, Unknown=0, NotChecked=0, Total=1122 [2020-12-21 21:30:04,063 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2020-12-21 21:30:04,079 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 41. [2020-12-21 21:30:04,079 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-12-21 21:30:04,080 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 42 transitions. [2020-12-21 21:30:04,080 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 42 transitions. Word has length 37 [2020-12-21 21:30:04,080 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:30:04,080 INFO L481 AbstractCegarLoop]: Abstraction has 41 states and 42 transitions. [2020-12-21 21:30:04,080 INFO L482 AbstractCegarLoop]: Interpolant automaton has 34 states. [2020-12-21 21:30:04,080 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 42 transitions. [2020-12-21 21:30:04,082 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2020-12-21 21:30:04,082 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:30:04,082 INFO L422 BasicCegarLoop]: trace histogram [31, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:30:04,283 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30,31 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:30:04,283 INFO L429 AbstractCegarLoop]: === Iteration 32 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:30:04,284 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:30:04,284 INFO L82 PathProgramCache]: Analyzing trace with hash 2003529835, now seen corresponding path program 31 times [2020-12-21 21:30:04,284 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:30:04,284 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [890312158] [2020-12-21 21:30:04,285 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:30:04,301 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:30:04,934 INFO L134 CoverageAnalysis]: Checked inductivity of 496 backedges. 0 proven. 496 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-21 21:30:04,934 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [890312158] [2020-12-21 21:30:04,934 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1411504765] [2020-12-21 21:30:04,934 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 32 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 32 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:30:04,999 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:30:05,001 INFO L263 TraceCheckSpWp]: Trace formula consists of 172 conjuncts, 33 conjunts are in the unsatisfiable core [2020-12-21 21:30:05,002 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:30:05,072 INFO L134 CoverageAnalysis]: Checked inductivity of 496 backedges. 0 proven. 496 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-21 21:30:05,072 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:30:05,072 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 34] total 35 [2020-12-21 21:30:05,073 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1153852813] [2020-12-21 21:30:05,073 INFO L461 AbstractCegarLoop]: Interpolant automaton has 35 states [2020-12-21 21:30:05,073 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:30:05,074 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2020-12-21 21:30:05,074 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=595, Invalid=595, Unknown=0, NotChecked=0, Total=1190 [2020-12-21 21:30:05,074 INFO L87 Difference]: Start difference. First operand 41 states and 42 transitions. Second operand 35 states. [2020-12-21 21:30:05,132 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:30:05,132 INFO L93 Difference]: Finished difference Result 49 states and 51 transitions. [2020-12-21 21:30:05,133 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2020-12-21 21:30:05,133 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 38 [2020-12-21 21:30:05,133 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:30:05,133 INFO L225 Difference]: With dead ends: 49 [2020-12-21 21:30:05,134 INFO L226 Difference]: Without dead ends: 42 [2020-12-21 21:30:05,134 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 71 GetRequests, 38 SyntacticMatches, 0 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 60 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=595, Invalid=595, Unknown=0, NotChecked=0, Total=1190 [2020-12-21 21:30:05,135 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2020-12-21 21:30:05,137 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 42. [2020-12-21 21:30:05,137 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2020-12-21 21:30:05,137 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 43 transitions. [2020-12-21 21:30:05,137 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 43 transitions. Word has length 38 [2020-12-21 21:30:05,137 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:30:05,138 INFO L481 AbstractCegarLoop]: Abstraction has 42 states and 43 transitions. [2020-12-21 21:30:05,138 INFO L482 AbstractCegarLoop]: Interpolant automaton has 35 states. [2020-12-21 21:30:05,138 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 43 transitions. [2020-12-21 21:30:05,138 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2020-12-21 21:30:05,138 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:30:05,138 INFO L422 BasicCegarLoop]: trace histogram [32, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:30:05,352 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31,32 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:30:05,353 INFO L429 AbstractCegarLoop]: === Iteration 33 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:30:05,353 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:30:05,353 INFO L82 PathProgramCache]: Analyzing trace with hash 2031358672, now seen corresponding path program 32 times [2020-12-21 21:30:05,354 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:30:05,354 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [361252970] [2020-12-21 21:30:05,354 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:30:05,372 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:30:06,111 INFO L134 CoverageAnalysis]: Checked inductivity of 528 backedges. 0 proven. 528 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-21 21:30:06,111 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [361252970] [2020-12-21 21:30:06,111 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [761909904] [2020-12-21 21:30:06,111 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 33 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 33 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:30:06,171 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2020-12-21 21:30:06,171 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 21:30:06,172 INFO L263 TraceCheckSpWp]: Trace formula consists of 176 conjuncts, 34 conjunts are in the unsatisfiable core [2020-12-21 21:30:06,173 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:30:06,243 INFO L134 CoverageAnalysis]: Checked inductivity of 528 backedges. 0 proven. 528 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-21 21:30:06,244 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:30:06,244 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 35] total 36 [2020-12-21 21:30:06,244 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1834540804] [2020-12-21 21:30:06,245 INFO L461 AbstractCegarLoop]: Interpolant automaton has 36 states [2020-12-21 21:30:06,245 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:30:06,245 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2020-12-21 21:30:06,246 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=630, Invalid=630, Unknown=0, NotChecked=0, Total=1260 [2020-12-21 21:30:06,246 INFO L87 Difference]: Start difference. First operand 42 states and 43 transitions. Second operand 36 states. [2020-12-21 21:30:06,305 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:30:06,305 INFO L93 Difference]: Finished difference Result 50 states and 52 transitions. [2020-12-21 21:30:06,305 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2020-12-21 21:30:06,306 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 39 [2020-12-21 21:30:06,306 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:30:06,306 INFO L225 Difference]: With dead ends: 50 [2020-12-21 21:30:06,306 INFO L226 Difference]: Without dead ends: 43 [2020-12-21 21:30:06,307 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 73 GetRequests, 39 SyntacticMatches, 0 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 62 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=630, Invalid=630, Unknown=0, NotChecked=0, Total=1260 [2020-12-21 21:30:06,307 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2020-12-21 21:30:06,309 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 43. [2020-12-21 21:30:06,309 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2020-12-21 21:30:06,310 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 44 transitions. [2020-12-21 21:30:06,310 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 44 transitions. Word has length 39 [2020-12-21 21:30:06,310 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:30:06,310 INFO L481 AbstractCegarLoop]: Abstraction has 43 states and 44 transitions. [2020-12-21 21:30:06,310 INFO L482 AbstractCegarLoop]: Interpolant automaton has 36 states. [2020-12-21 21:30:06,310 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 44 transitions. [2020-12-21 21:30:06,311 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2020-12-21 21:30:06,311 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:30:06,311 INFO L422 BasicCegarLoop]: trace histogram [33, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:30:06,526 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 33 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable32 [2020-12-21 21:30:06,527 INFO L429 AbstractCegarLoop]: === Iteration 34 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:30:06,527 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:30:06,528 INFO L82 PathProgramCache]: Analyzing trace with hash -1400914677, now seen corresponding path program 33 times [2020-12-21 21:30:06,528 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:30:06,528 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1268074804] [2020-12-21 21:30:06,529 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:30:06,546 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:30:07,331 INFO L134 CoverageAnalysis]: Checked inductivity of 561 backedges. 0 proven. 561 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-21 21:30:07,331 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1268074804] [2020-12-21 21:30:07,331 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2007698003] [2020-12-21 21:30:07,332 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 34 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 34 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:30:24,330 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 18 check-sat command(s) [2020-12-21 21:30:24,331 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 21:30:24,360 INFO L263 TraceCheckSpWp]: Trace formula consists of 180 conjuncts, 35 conjunts are in the unsatisfiable core [2020-12-21 21:30:24,361 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:30:24,426 INFO L134 CoverageAnalysis]: Checked inductivity of 561 backedges. 0 proven. 561 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-21 21:30:24,426 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:30:24,427 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36, 36] total 37 [2020-12-21 21:30:24,428 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1567900100] [2020-12-21 21:30:24,428 INFO L461 AbstractCegarLoop]: Interpolant automaton has 37 states [2020-12-21 21:30:24,428 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:30:24,429 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2020-12-21 21:30:24,429 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=666, Invalid=666, Unknown=0, NotChecked=0, Total=1332 [2020-12-21 21:30:24,429 INFO L87 Difference]: Start difference. First operand 43 states and 44 transitions. Second operand 37 states. [2020-12-21 21:30:24,500 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:30:24,500 INFO L93 Difference]: Finished difference Result 51 states and 53 transitions. [2020-12-21 21:30:24,501 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2020-12-21 21:30:24,501 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 40 [2020-12-21 21:30:24,501 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:30:24,501 INFO L225 Difference]: With dead ends: 51 [2020-12-21 21:30:24,501 INFO L226 Difference]: Without dead ends: 44 [2020-12-21 21:30:24,502 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 75 GetRequests, 40 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 64 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=666, Invalid=666, Unknown=0, NotChecked=0, Total=1332 [2020-12-21 21:30:24,502 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2020-12-21 21:30:24,505 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 44. [2020-12-21 21:30:24,505 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2020-12-21 21:30:24,505 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 45 transitions. [2020-12-21 21:30:24,506 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 45 transitions. Word has length 40 [2020-12-21 21:30:24,506 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:30:24,506 INFO L481 AbstractCegarLoop]: Abstraction has 44 states and 45 transitions. [2020-12-21 21:30:24,506 INFO L482 AbstractCegarLoop]: Interpolant automaton has 37 states. [2020-12-21 21:30:24,506 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 45 transitions. [2020-12-21 21:30:24,506 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-12-21 21:30:24,507 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:30:24,507 INFO L422 BasicCegarLoop]: trace histogram [34, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:30:24,720 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable33,34 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:30:24,721 INFO L429 AbstractCegarLoop]: === Iteration 35 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:30:24,721 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:30:24,722 INFO L82 PathProgramCache]: Analyzing trace with hash -427206096, now seen corresponding path program 34 times [2020-12-21 21:30:24,722 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:30:24,722 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1241928735] [2020-12-21 21:30:24,723 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:30:24,740 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:30:25,574 INFO L134 CoverageAnalysis]: Checked inductivity of 595 backedges. 0 proven. 595 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-21 21:30:25,574 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1241928735] [2020-12-21 21:30:25,574 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [839227512] [2020-12-21 21:30:25,574 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 35 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 35 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:30:25,639 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2020-12-21 21:30:25,639 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 21:30:25,640 INFO L263 TraceCheckSpWp]: Trace formula consists of 184 conjuncts, 36 conjunts are in the unsatisfiable core [2020-12-21 21:30:25,642 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:30:25,719 INFO L134 CoverageAnalysis]: Checked inductivity of 595 backedges. 0 proven. 595 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-21 21:30:25,719 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:30:25,719 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37, 37] total 38 [2020-12-21 21:30:25,720 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1309888418] [2020-12-21 21:30:25,720 INFO L461 AbstractCegarLoop]: Interpolant automaton has 38 states [2020-12-21 21:30:25,720 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:30:25,721 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2020-12-21 21:30:25,721 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=703, Invalid=703, Unknown=0, NotChecked=0, Total=1406 [2020-12-21 21:30:25,721 INFO L87 Difference]: Start difference. First operand 44 states and 45 transitions. Second operand 38 states. [2020-12-21 21:30:25,788 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:30:25,788 INFO L93 Difference]: Finished difference Result 52 states and 54 transitions. [2020-12-21 21:30:25,788 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2020-12-21 21:30:25,788 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 41 [2020-12-21 21:30:25,789 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:30:25,789 INFO L225 Difference]: With dead ends: 52 [2020-12-21 21:30:25,789 INFO L226 Difference]: Without dead ends: 45 [2020-12-21 21:30:25,790 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 77 GetRequests, 41 SyntacticMatches, 0 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 66 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=703, Invalid=703, Unknown=0, NotChecked=0, Total=1406 [2020-12-21 21:30:25,791 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2020-12-21 21:30:25,792 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 45. [2020-12-21 21:30:25,793 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2020-12-21 21:30:25,793 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 46 transitions. [2020-12-21 21:30:25,793 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 46 transitions. Word has length 41 [2020-12-21 21:30:25,793 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:30:25,793 INFO L481 AbstractCegarLoop]: Abstraction has 45 states and 46 transitions. [2020-12-21 21:30:25,793 INFO L482 AbstractCegarLoop]: Interpolant automaton has 38 states. [2020-12-21 21:30:25,794 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 46 transitions. [2020-12-21 21:30:25,794 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2020-12-21 21:30:25,794 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:30:25,794 INFO L422 BasicCegarLoop]: trace histogram [35, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:30:26,007 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 35 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable34 [2020-12-21 21:30:26,008 INFO L429 AbstractCegarLoop]: === Iteration 36 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:30:26,008 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:30:26,009 INFO L82 PathProgramCache]: Analyzing trace with hash -307011157, now seen corresponding path program 35 times [2020-12-21 21:30:26,009 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:30:26,009 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1680152140] [2020-12-21 21:30:26,009 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:30:26,026 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:30:26,879 INFO L134 CoverageAnalysis]: Checked inductivity of 630 backedges. 0 proven. 630 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-21 21:30:26,880 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1680152140] [2020-12-21 21:30:26,880 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2124777775] [2020-12-21 21:30:26,880 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 36 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 36 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:30:33,277 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 19 check-sat command(s) [2020-12-21 21:30:33,278 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 21:30:33,293 INFO L263 TraceCheckSpWp]: Trace formula consists of 188 conjuncts, 37 conjunts are in the unsatisfiable core [2020-12-21 21:30:33,294 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:30:33,369 INFO L134 CoverageAnalysis]: Checked inductivity of 630 backedges. 0 proven. 630 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-21 21:30:33,369 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:30:33,370 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [38, 38] total 39 [2020-12-21 21:30:33,370 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [231562360] [2020-12-21 21:30:33,370 INFO L461 AbstractCegarLoop]: Interpolant automaton has 39 states [2020-12-21 21:30:33,370 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:30:33,371 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2020-12-21 21:30:33,372 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=741, Invalid=741, Unknown=0, NotChecked=0, Total=1482 [2020-12-21 21:30:33,372 INFO L87 Difference]: Start difference. First operand 45 states and 46 transitions. Second operand 39 states. [2020-12-21 21:30:33,435 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:30:33,435 INFO L93 Difference]: Finished difference Result 53 states and 55 transitions. [2020-12-21 21:30:33,436 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2020-12-21 21:30:33,436 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 42 [2020-12-21 21:30:33,436 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:30:33,437 INFO L225 Difference]: With dead ends: 53 [2020-12-21 21:30:33,437 INFO L226 Difference]: Without dead ends: 46 [2020-12-21 21:30:33,438 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 79 GetRequests, 42 SyntacticMatches, 0 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 68 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=741, Invalid=741, Unknown=0, NotChecked=0, Total=1482 [2020-12-21 21:30:33,438 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2020-12-21 21:30:33,440 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 46. [2020-12-21 21:30:33,440 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-12-21 21:30:33,440 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 47 transitions. [2020-12-21 21:30:33,440 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 47 transitions. Word has length 42 [2020-12-21 21:30:33,441 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:30:33,441 INFO L481 AbstractCegarLoop]: Abstraction has 46 states and 47 transitions. [2020-12-21 21:30:33,441 INFO L482 AbstractCegarLoop]: Interpolant automaton has 39 states. [2020-12-21 21:30:33,441 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 47 transitions. [2020-12-21 21:30:33,441 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2020-12-21 21:30:33,441 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:30:33,442 INFO L422 BasicCegarLoop]: trace histogram [36, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:30:33,654 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable35,36 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:30:33,655 INFO L429 AbstractCegarLoop]: === Iteration 37 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:30:33,655 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:30:33,655 INFO L82 PathProgramCache]: Analyzing trace with hash -875935344, now seen corresponding path program 36 times [2020-12-21 21:30:33,656 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:30:33,656 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [457707668] [2020-12-21 21:30:33,656 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:30:33,674 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:30:34,617 INFO L134 CoverageAnalysis]: Checked inductivity of 666 backedges. 0 proven. 666 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-21 21:30:34,618 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [457707668] [2020-12-21 21:30:34,618 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1202889844] [2020-12-21 21:30:34,618 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 37 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 37 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:31:26,767 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 19 check-sat command(s) [2020-12-21 21:31:26,768 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 21:31:26,834 INFO L263 TraceCheckSpWp]: Trace formula consists of 192 conjuncts, 38 conjunts are in the unsatisfiable core [2020-12-21 21:31:26,836 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:31:26,922 INFO L134 CoverageAnalysis]: Checked inductivity of 666 backedges. 0 proven. 666 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-21 21:31:26,923 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:31:26,923 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39, 39] total 40 [2020-12-21 21:31:26,923 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1201401449] [2020-12-21 21:31:26,923 INFO L461 AbstractCegarLoop]: Interpolant automaton has 40 states [2020-12-21 21:31:26,924 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:31:26,924 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2020-12-21 21:31:26,925 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=780, Invalid=780, Unknown=0, NotChecked=0, Total=1560 [2020-12-21 21:31:26,925 INFO L87 Difference]: Start difference. First operand 46 states and 47 transitions. Second operand 40 states. [2020-12-21 21:31:26,980 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:31:26,980 INFO L93 Difference]: Finished difference Result 54 states and 56 transitions. [2020-12-21 21:31:26,980 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2020-12-21 21:31:26,981 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 43 [2020-12-21 21:31:26,981 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:31:26,981 INFO L225 Difference]: With dead ends: 54 [2020-12-21 21:31:26,981 INFO L226 Difference]: Without dead ends: 47 [2020-12-21 21:31:26,982 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 81 GetRequests, 43 SyntacticMatches, 0 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 70 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=780, Invalid=780, Unknown=0, NotChecked=0, Total=1560 [2020-12-21 21:31:26,983 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2020-12-21 21:31:26,984 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 47. [2020-12-21 21:31:26,984 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2020-12-21 21:31:26,985 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 48 transitions. [2020-12-21 21:31:26,985 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 48 transitions. Word has length 43 [2020-12-21 21:31:26,985 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:31:26,985 INFO L481 AbstractCegarLoop]: Abstraction has 47 states and 48 transitions. [2020-12-21 21:31:26,985 INFO L482 AbstractCegarLoop]: Interpolant automaton has 40 states. [2020-12-21 21:31:26,985 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 48 transitions. [2020-12-21 21:31:26,986 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2020-12-21 21:31:26,986 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:31:26,986 INFO L422 BasicCegarLoop]: trace histogram [37, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:31:27,199 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 37 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable36 [2020-12-21 21:31:27,200 INFO L429 AbstractCegarLoop]: === Iteration 38 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:31:27,201 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:31:27,201 INFO L82 PathProgramCache]: Analyzing trace with hash -1332715957, now seen corresponding path program 37 times [2020-12-21 21:31:27,202 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:31:27,202 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1327533869] [2020-12-21 21:31:27,202 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:31:27,222 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:31:28,205 INFO L134 CoverageAnalysis]: Checked inductivity of 703 backedges. 0 proven. 703 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-21 21:31:28,205 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1327533869] [2020-12-21 21:31:28,205 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1546124782] [2020-12-21 21:31:28,205 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 38 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 38 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:31:28,266 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:31:28,268 INFO L263 TraceCheckSpWp]: Trace formula consists of 196 conjuncts, 39 conjunts are in the unsatisfiable core [2020-12-21 21:31:28,269 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:31:28,343 INFO L134 CoverageAnalysis]: Checked inductivity of 703 backedges. 0 proven. 703 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-21 21:31:28,343 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:31:28,343 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [40, 40] total 41 [2020-12-21 21:31:28,343 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1566179936] [2020-12-21 21:31:28,344 INFO L461 AbstractCegarLoop]: Interpolant automaton has 41 states [2020-12-21 21:31:28,344 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:31:28,344 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2020-12-21 21:31:28,345 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=820, Invalid=820, Unknown=0, NotChecked=0, Total=1640 [2020-12-21 21:31:28,345 INFO L87 Difference]: Start difference. First operand 47 states and 48 transitions. Second operand 41 states. [2020-12-21 21:31:28,409 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:31:28,409 INFO L93 Difference]: Finished difference Result 55 states and 57 transitions. [2020-12-21 21:31:28,409 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2020-12-21 21:31:28,409 INFO L78 Accepts]: Start accepts. Automaton has 41 states. Word has length 44 [2020-12-21 21:31:28,410 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:31:28,410 INFO L225 Difference]: With dead ends: 55 [2020-12-21 21:31:28,410 INFO L226 Difference]: Without dead ends: 48 [2020-12-21 21:31:28,411 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 83 GetRequests, 44 SyntacticMatches, 0 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 72 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=820, Invalid=820, Unknown=0, NotChecked=0, Total=1640 [2020-12-21 21:31:28,411 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2020-12-21 21:31:28,413 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 48. [2020-12-21 21:31:28,413 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2020-12-21 21:31:28,414 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 49 transitions. [2020-12-21 21:31:28,414 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 49 transitions. Word has length 44 [2020-12-21 21:31:28,414 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:31:28,414 INFO L481 AbstractCegarLoop]: Abstraction has 48 states and 49 transitions. [2020-12-21 21:31:28,414 INFO L482 AbstractCegarLoop]: Interpolant automaton has 41 states. [2020-12-21 21:31:28,414 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 49 transitions. [2020-12-21 21:31:28,415 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2020-12-21 21:31:28,415 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:31:28,415 INFO L422 BasicCegarLoop]: trace histogram [38, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:31:28,628 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 38 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable37 [2020-12-21 21:31:28,628 INFO L429 AbstractCegarLoop]: === Iteration 39 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:31:28,629 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:31:28,629 INFO L82 PathProgramCache]: Analyzing trace with hash 1686954224, now seen corresponding path program 38 times [2020-12-21 21:31:28,629 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:31:28,629 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [208651312] [2020-12-21 21:31:28,630 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:31:28,646 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:31:29,610 INFO L134 CoverageAnalysis]: Checked inductivity of 741 backedges. 0 proven. 741 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-21 21:31:29,610 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [208651312] [2020-12-21 21:31:29,610 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2122562772] [2020-12-21 21:31:29,610 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 39 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 39 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:31:29,675 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2020-12-21 21:31:29,675 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 21:31:29,676 INFO L263 TraceCheckSpWp]: Trace formula consists of 200 conjuncts, 40 conjunts are in the unsatisfiable core [2020-12-21 21:31:29,677 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:31:29,749 INFO L134 CoverageAnalysis]: Checked inductivity of 741 backedges. 0 proven. 741 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-21 21:31:29,749 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:31:29,749 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [41, 41] total 42 [2020-12-21 21:31:29,750 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2145863092] [2020-12-21 21:31:29,750 INFO L461 AbstractCegarLoop]: Interpolant automaton has 42 states [2020-12-21 21:31:29,750 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:31:29,751 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2020-12-21 21:31:29,751 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=861, Invalid=861, Unknown=0, NotChecked=0, Total=1722 [2020-12-21 21:31:29,751 INFO L87 Difference]: Start difference. First operand 48 states and 49 transitions. Second operand 42 states. [2020-12-21 21:31:29,804 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:31:29,804 INFO L93 Difference]: Finished difference Result 56 states and 58 transitions. [2020-12-21 21:31:29,805 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2020-12-21 21:31:29,805 INFO L78 Accepts]: Start accepts. Automaton has 42 states. Word has length 45 [2020-12-21 21:31:29,805 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:31:29,805 INFO L225 Difference]: With dead ends: 56 [2020-12-21 21:31:29,806 INFO L226 Difference]: Without dead ends: 49 [2020-12-21 21:31:29,806 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 85 GetRequests, 45 SyntacticMatches, 0 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 74 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=861, Invalid=861, Unknown=0, NotChecked=0, Total=1722 [2020-12-21 21:31:29,807 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2020-12-21 21:31:29,808 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 49. [2020-12-21 21:31:29,809 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2020-12-21 21:31:29,809 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 50 transitions. [2020-12-21 21:31:29,809 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 50 transitions. Word has length 45 [2020-12-21 21:31:29,809 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:31:29,810 INFO L481 AbstractCegarLoop]: Abstraction has 49 states and 50 transitions. [2020-12-21 21:31:29,810 INFO L482 AbstractCegarLoop]: Interpolant automaton has 42 states. [2020-12-21 21:31:29,810 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 50 transitions. [2020-12-21 21:31:29,810 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2020-12-21 21:31:29,810 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:31:29,810 INFO L422 BasicCegarLoop]: trace histogram [39, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:31:30,024 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 39 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable38 [2020-12-21 21:31:30,025 INFO L429 AbstractCegarLoop]: === Iteration 40 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:31:30,025 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:31:30,025 INFO L82 PathProgramCache]: Analyzing trace with hash 807449323, now seen corresponding path program 39 times [2020-12-21 21:31:30,026 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:31:30,026 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [534901309] [2020-12-21 21:31:30,026 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:31:30,055 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:31:31,109 INFO L134 CoverageAnalysis]: Checked inductivity of 780 backedges. 0 proven. 780 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-21 21:31:31,109 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [534901309] [2020-12-21 21:31:31,109 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [460228039] [2020-12-21 21:31:31,110 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 40 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 40 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:32:05,981 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 21 check-sat command(s) [2020-12-21 21:32:05,982 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 21:32:06,030 INFO L263 TraceCheckSpWp]: Trace formula consists of 204 conjuncts, 41 conjunts are in the unsatisfiable core [2020-12-21 21:32:06,032 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:32:06,112 INFO L134 CoverageAnalysis]: Checked inductivity of 780 backedges. 0 proven. 780 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-21 21:32:06,113 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:32:06,113 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [42, 42] total 43 [2020-12-21 21:32:06,113 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [477497889] [2020-12-21 21:32:06,113 INFO L461 AbstractCegarLoop]: Interpolant automaton has 43 states [2020-12-21 21:32:06,113 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:32:06,114 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2020-12-21 21:32:06,115 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=903, Invalid=903, Unknown=0, NotChecked=0, Total=1806 [2020-12-21 21:32:06,115 INFO L87 Difference]: Start difference. First operand 49 states and 50 transitions. Second operand 43 states. [2020-12-21 21:32:06,186 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:32:06,187 INFO L93 Difference]: Finished difference Result 57 states and 59 transitions. [2020-12-21 21:32:06,187 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2020-12-21 21:32:06,187 INFO L78 Accepts]: Start accepts. Automaton has 43 states. Word has length 46 [2020-12-21 21:32:06,187 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:32:06,188 INFO L225 Difference]: With dead ends: 57 [2020-12-21 21:32:06,188 INFO L226 Difference]: Without dead ends: 50 [2020-12-21 21:32:06,189 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 87 GetRequests, 46 SyntacticMatches, 0 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 76 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=903, Invalid=903, Unknown=0, NotChecked=0, Total=1806 [2020-12-21 21:32:06,189 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2020-12-21 21:32:06,191 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 50. [2020-12-21 21:32:06,191 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 50 states. [2020-12-21 21:32:06,192 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 51 transitions. [2020-12-21 21:32:06,192 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 51 transitions. Word has length 46 [2020-12-21 21:32:06,192 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:32:06,192 INFO L481 AbstractCegarLoop]: Abstraction has 50 states and 51 transitions. [2020-12-21 21:32:06,192 INFO L482 AbstractCegarLoop]: Interpolant automaton has 43 states. [2020-12-21 21:32:06,192 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 51 transitions. [2020-12-21 21:32:06,193 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2020-12-21 21:32:06,193 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:32:06,193 INFO L422 BasicCegarLoop]: trace histogram [40, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:32:06,407 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 40 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable39 [2020-12-21 21:32:06,408 INFO L429 AbstractCegarLoop]: === Iteration 41 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:32:06,408 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:32:06,408 INFO L82 PathProgramCache]: Analyzing trace with hash -687398832, now seen corresponding path program 40 times [2020-12-21 21:32:06,409 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:32:06,409 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1246723838] [2020-12-21 21:32:06,409 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:32:06,425 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:32:07,495 INFO L134 CoverageAnalysis]: Checked inductivity of 820 backedges. 0 proven. 820 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-21 21:32:07,496 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1246723838] [2020-12-21 21:32:07,496 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [726839464] [2020-12-21 21:32:07,496 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 41 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 41 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:32:07,565 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2020-12-21 21:32:07,565 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 21:32:07,567 INFO L263 TraceCheckSpWp]: Trace formula consists of 208 conjuncts, 42 conjunts are in the unsatisfiable core [2020-12-21 21:32:07,568 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:32:07,642 INFO L134 CoverageAnalysis]: Checked inductivity of 820 backedges. 0 proven. 820 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-21 21:32:07,643 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:32:07,643 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [43, 43] total 44 [2020-12-21 21:32:07,643 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1224492069] [2020-12-21 21:32:07,643 INFO L461 AbstractCegarLoop]: Interpolant automaton has 44 states [2020-12-21 21:32:07,643 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:32:07,644 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2020-12-21 21:32:07,645 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=946, Invalid=946, Unknown=0, NotChecked=0, Total=1892 [2020-12-21 21:32:07,645 INFO L87 Difference]: Start difference. First operand 50 states and 51 transitions. Second operand 44 states. [2020-12-21 21:32:07,715 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:32:07,715 INFO L93 Difference]: Finished difference Result 58 states and 60 transitions. [2020-12-21 21:32:07,715 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2020-12-21 21:32:07,715 INFO L78 Accepts]: Start accepts. Automaton has 44 states. Word has length 47 [2020-12-21 21:32:07,716 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:32:07,716 INFO L225 Difference]: With dead ends: 58 [2020-12-21 21:32:07,716 INFO L226 Difference]: Without dead ends: 51 [2020-12-21 21:32:07,717 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 89 GetRequests, 47 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 78 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=946, Invalid=946, Unknown=0, NotChecked=0, Total=1892 [2020-12-21 21:32:07,717 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2020-12-21 21:32:07,719 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 51. [2020-12-21 21:32:07,719 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2020-12-21 21:32:07,720 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 52 transitions. [2020-12-21 21:32:07,720 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 52 transitions. Word has length 47 [2020-12-21 21:32:07,720 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:32:07,720 INFO L481 AbstractCegarLoop]: Abstraction has 51 states and 52 transitions. [2020-12-21 21:32:07,720 INFO L482 AbstractCegarLoop]: Interpolant automaton has 44 states. [2020-12-21 21:32:07,720 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 52 transitions. [2020-12-21 21:32:07,721 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2020-12-21 21:32:07,721 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:32:07,721 INFO L422 BasicCegarLoop]: trace histogram [41, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:32:07,935 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable40,41 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:32:07,936 INFO L429 AbstractCegarLoop]: === Iteration 42 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:32:07,936 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:32:07,936 INFO L82 PathProgramCache]: Analyzing trace with hash 216948619, now seen corresponding path program 41 times [2020-12-21 21:32:07,937 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:32:07,937 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2070830944] [2020-12-21 21:32:07,937 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:32:07,956 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:32:09,149 INFO L134 CoverageAnalysis]: Checked inductivity of 861 backedges. 0 proven. 861 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-21 21:32:09,150 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2070830944] [2020-12-21 21:32:09,150 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2099814011] [2020-12-21 21:32:09,150 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 42 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 42 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:32:24,830 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 22 check-sat command(s) [2020-12-21 21:32:24,830 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 21:32:24,858 INFO L263 TraceCheckSpWp]: Trace formula consists of 212 conjuncts, 43 conjunts are in the unsatisfiable core [2020-12-21 21:32:24,859 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:32:24,934 INFO L134 CoverageAnalysis]: Checked inductivity of 861 backedges. 0 proven. 861 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-21 21:32:24,935 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:32:24,935 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [44, 44] total 45 [2020-12-21 21:32:24,935 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1616410255] [2020-12-21 21:32:24,935 INFO L461 AbstractCegarLoop]: Interpolant automaton has 45 states [2020-12-21 21:32:24,936 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:32:24,936 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2020-12-21 21:32:24,937 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=990, Invalid=990, Unknown=0, NotChecked=0, Total=1980 [2020-12-21 21:32:24,937 INFO L87 Difference]: Start difference. First operand 51 states and 52 transitions. Second operand 45 states. [2020-12-21 21:32:25,007 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:32:25,007 INFO L93 Difference]: Finished difference Result 59 states and 61 transitions. [2020-12-21 21:32:25,008 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2020-12-21 21:32:25,008 INFO L78 Accepts]: Start accepts. Automaton has 45 states. Word has length 48 [2020-12-21 21:32:25,008 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:32:25,008 INFO L225 Difference]: With dead ends: 59 [2020-12-21 21:32:25,009 INFO L226 Difference]: Without dead ends: 52 [2020-12-21 21:32:25,012 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 91 GetRequests, 48 SyntacticMatches, 0 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 80 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=990, Invalid=990, Unknown=0, NotChecked=0, Total=1980 [2020-12-21 21:32:25,012 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2020-12-21 21:32:25,014 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 52. [2020-12-21 21:32:25,015 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 52 states. [2020-12-21 21:32:25,016 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 53 transitions. [2020-12-21 21:32:25,016 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 53 transitions. Word has length 48 [2020-12-21 21:32:25,016 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:32:25,016 INFO L481 AbstractCegarLoop]: Abstraction has 52 states and 53 transitions. [2020-12-21 21:32:25,016 INFO L482 AbstractCegarLoop]: Interpolant automaton has 45 states. [2020-12-21 21:32:25,016 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 53 transitions. [2020-12-21 21:32:25,017 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2020-12-21 21:32:25,017 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:32:25,017 INFO L422 BasicCegarLoop]: trace histogram [42, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:32:25,230 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 42 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable41 [2020-12-21 21:32:25,231 INFO L429 AbstractCegarLoop]: === Iteration 43 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:32:25,231 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:32:25,232 INFO L82 PathProgramCache]: Analyzing trace with hash -1813051472, now seen corresponding path program 42 times [2020-12-21 21:32:25,232 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:32:25,232 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1784119590] [2020-12-21 21:32:25,232 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:32:25,255 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:32:26,489 INFO L134 CoverageAnalysis]: Checked inductivity of 903 backedges. 0 proven. 903 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-21 21:32:26,489 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1784119590] [2020-12-21 21:32:26,489 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1268695391] [2020-12-21 21:32:26,489 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 43 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 43 with z3 -smt2 -in SMTLIB2_COMPLIANT=true