/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/loops-crafted-1/Mono5_1.c -------------------------------------------------------------------------------- This is Ultimate 0.2.1-bitabs-178dd20 [2021-01-06 16:55:41,089 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-01-06 16:55:41,092 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-01-06 16:55:41,146 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-01-06 16:55:41,147 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-01-06 16:55:41,152 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-01-06 16:55:41,156 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-01-06 16:55:41,162 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-01-06 16:55:41,166 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-01-06 16:55:41,173 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-01-06 16:55:41,177 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-01-06 16:55:41,179 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-01-06 16:55:41,179 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-01-06 16:55:41,183 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-01-06 16:55:41,186 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-01-06 16:55:41,207 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-01-06 16:55:41,208 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-01-06 16:55:41,212 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-01-06 16:55:41,219 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-01-06 16:55:41,228 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-01-06 16:55:41,230 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-01-06 16:55:41,232 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-01-06 16:55:41,234 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-01-06 16:55:41,237 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-01-06 16:55:41,246 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2021-01-06 16:55:41,252 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-01-06 16:55:41,253 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-01-06 16:55:41,255 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-01-06 16:55:41,256 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-01-06 16:55:41,258 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-01-06 16:55:41,258 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-01-06 16:55:41,259 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-01-06 16:55:41,265 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-01-06 16:55:41,266 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-01-06 16:55:41,267 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-01-06 16:55:41,268 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-01-06 16:55:41,269 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/config/svcomp-Reach-64bit-Automizer_Default.epf [2021-01-06 16:55:41,324 INFO L113 SettingsManager]: Loading preferences was successful [2021-01-06 16:55:41,324 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-01-06 16:55:41,329 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-01-06 16:55:41,330 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-01-06 16:55:41,330 INFO L138 SettingsManager]: * Use SBE=true [2021-01-06 16:55:41,330 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-01-06 16:55:41,331 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-01-06 16:55:41,331 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-01-06 16:55:41,331 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-01-06 16:55:41,331 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-01-06 16:55:41,333 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-01-06 16:55:41,333 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-01-06 16:55:41,333 INFO L138 SettingsManager]: * Use constant arrays=true [2021-01-06 16:55:41,334 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-01-06 16:55:41,334 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-01-06 16:55:41,334 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-01-06 16:55:41,334 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-01-06 16:55:41,335 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-01-06 16:55:41,335 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-01-06 16:55:41,335 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-01-06 16:55:41,335 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-01-06 16:55:41,336 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-01-06 16:55:41,336 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-01-06 16:55:41,336 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-01-06 16:55:41,336 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-01-06 16:55:41,336 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-bitabs/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release [2021-01-06 16:55:41,787 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-01-06 16:55:41,819 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-01-06 16:55:41,823 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-01-06 16:55:41,824 INFO L271 PluginConnector]: Initializing CDTParser... [2021-01-06 16:55:41,825 INFO L275 PluginConnector]: CDTParser initialized [2021-01-06 16:55:41,829 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/loops-crafted-1/Mono5_1.c [2021-01-06 16:55:41,926 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/data/40d28590e/6a0d0daee73e4ff7a5e7a8791092617c/FLAG8c8461334 [2021-01-06 16:55:42,611 INFO L306 CDTParser]: Found 1 translation units. [2021-01-06 16:55:42,611 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-bitabs/releaseScripts/default/sv-benchmarks/c/loops-crafted-1/Mono5_1.c [2021-01-06 16:55:42,621 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/data/40d28590e/6a0d0daee73e4ff7a5e7a8791092617c/FLAG8c8461334 [2021-01-06 16:55:42,961 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/data/40d28590e/6a0d0daee73e4ff7a5e7a8791092617c [2021-01-06 16:55:42,965 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-01-06 16:55:42,967 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-01-06 16:55:42,969 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-01-06 16:55:42,969 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-01-06 16:55:42,974 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-01-06 16:55:42,975 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.01 04:55:42" (1/1) ... [2021-01-06 16:55:42,976 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@661fe290 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.01 04:55:42, skipping insertion in model container [2021-01-06 16:55:42,976 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.01 04:55:42" (1/1) ... [2021-01-06 16:55:42,985 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-01-06 16:55:43,000 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-01-06 16:55:43,150 WARN L226 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate-bitabs/releaseScripts/default/sv-benchmarks/c/loops-crafted-1/Mono5_1.c[311,324] [2021-01-06 16:55:43,163 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-01-06 16:55:43,175 INFO L203 MainTranslator]: Completed pre-run [2021-01-06 16:55:43,190 WARN L226 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate-bitabs/releaseScripts/default/sv-benchmarks/c/loops-crafted-1/Mono5_1.c[311,324] [2021-01-06 16:55:43,194 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-01-06 16:55:43,212 INFO L208 MainTranslator]: Completed translation [2021-01-06 16:55:43,212 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.01 04:55:43 WrapperNode [2021-01-06 16:55:43,213 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-01-06 16:55:43,214 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-01-06 16:55:43,215 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-01-06 16:55:43,215 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-01-06 16:55:43,224 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.01 04:55:43" (1/1) ... [2021-01-06 16:55:43,233 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.01 04:55:43" (1/1) ... [2021-01-06 16:55:43,254 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-01-06 16:55:43,255 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-01-06 16:55:43,255 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-01-06 16:55:43,256 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-01-06 16:55:43,266 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.01 04:55:43" (1/1) ... [2021-01-06 16:55:43,267 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.01 04:55:43" (1/1) ... [2021-01-06 16:55:43,268 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.01 04:55:43" (1/1) ... [2021-01-06 16:55:43,269 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.01 04:55:43" (1/1) ... [2021-01-06 16:55:43,272 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.01 04:55:43" (1/1) ... [2021-01-06 16:55:43,277 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.01 04:55:43" (1/1) ... [2021-01-06 16:55:43,278 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.01 04:55:43" (1/1) ... [2021-01-06 16:55:43,280 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-01-06 16:55:43,281 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-01-06 16:55:43,281 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-01-06 16:55:43,282 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-01-06 16:55:43,283 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.01 04:55:43" (1/1) ... No working directory specified, using /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-01-06 16:55:43,405 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-01-06 16:55:43,406 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-01-06 16:55:43,407 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-01-06 16:55:43,407 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-01-06 16:55:43,833 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-01-06 16:55:43,834 INFO L299 CfgBuilder]: Removed 7 assume(true) statements. [2021-01-06 16:55:43,836 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.01 04:55:43 BoogieIcfgContainer [2021-01-06 16:55:43,837 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-01-06 16:55:43,839 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-01-06 16:55:43,841 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-01-06 16:55:43,845 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-01-06 16:55:43,846 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 06.01 04:55:42" (1/3) ... [2021-01-06 16:55:43,848 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@78164ca4 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.01 04:55:43, skipping insertion in model container [2021-01-06 16:55:43,848 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.01 04:55:43" (2/3) ... [2021-01-06 16:55:43,849 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@78164ca4 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.01 04:55:43, skipping insertion in model container [2021-01-06 16:55:43,849 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.01 04:55:43" (3/3) ... [2021-01-06 16:55:43,851 INFO L111 eAbstractionObserver]: Analyzing ICFG Mono5_1.c [2021-01-06 16:55:43,860 INFO L153 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-01-06 16:55:43,865 INFO L165 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-01-06 16:55:43,905 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-01-06 16:55:43,951 INFO L377 AbstractCegarLoop]: Interprodecural is true [2021-01-06 16:55:43,951 INFO L378 AbstractCegarLoop]: Hoare is true [2021-01-06 16:55:43,951 INFO L379 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-01-06 16:55:43,952 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-01-06 16:55:43,952 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-01-06 16:55:43,952 INFO L382 AbstractCegarLoop]: Difference is false [2021-01-06 16:55:43,952 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-01-06 16:55:43,952 INFO L387 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-01-06 16:55:43,970 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states. [2021-01-06 16:55:43,977 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2021-01-06 16:55:43,977 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 16:55:43,978 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2021-01-06 16:55:43,979 INFO L429 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 16:55:43,987 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 16:55:43,988 INFO L82 PathProgramCache]: Analyzing trace with hash 889968487, now seen corresponding path program 1 times [2021-01-06 16:55:44,000 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 16:55:44,001 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1326968088] [2021-01-06 16:55:44,002 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 16:55:44,147 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 16:55:44,231 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-01-06 16:55:44,236 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1326968088] [2021-01-06 16:55:44,237 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-01-06 16:55:44,237 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-01-06 16:55:44,238 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1124072648] [2021-01-06 16:55:44,244 INFO L461 AbstractCegarLoop]: Interpolant automaton has 2 states [2021-01-06 16:55:44,245 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 16:55:44,262 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2021-01-06 16:55:44,263 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-01-06 16:55:44,266 INFO L87 Difference]: Start difference. First operand 12 states. Second operand 2 states. [2021-01-06 16:55:44,284 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 16:55:44,284 INFO L93 Difference]: Finished difference Result 19 states and 22 transitions. [2021-01-06 16:55:44,284 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2021-01-06 16:55:44,286 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 6 [2021-01-06 16:55:44,286 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 16:55:44,298 INFO L225 Difference]: With dead ends: 19 [2021-01-06 16:55:44,299 INFO L226 Difference]: Without dead ends: 9 [2021-01-06 16:55:44,303 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-01-06 16:55:44,341 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9 states. [2021-01-06 16:55:44,371 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9 to 9. [2021-01-06 16:55:44,373 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 9 states. [2021-01-06 16:55:44,374 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9 states to 9 states and 10 transitions. [2021-01-06 16:55:44,378 INFO L78 Accepts]: Start accepts. Automaton has 9 states and 10 transitions. Word has length 6 [2021-01-06 16:55:44,379 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 16:55:44,379 INFO L481 AbstractCegarLoop]: Abstraction has 9 states and 10 transitions. [2021-01-06 16:55:44,382 INFO L482 AbstractCegarLoop]: Interpolant automaton has 2 states. [2021-01-06 16:55:44,382 INFO L276 IsEmpty]: Start isEmpty. Operand 9 states and 10 transitions. [2021-01-06 16:55:44,383 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2021-01-06 16:55:44,383 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 16:55:44,383 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2021-01-06 16:55:44,383 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-01-06 16:55:44,384 INFO L429 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 16:55:44,387 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 16:55:44,388 INFO L82 PathProgramCache]: Analyzing trace with hash 889640786, now seen corresponding path program 1 times [2021-01-06 16:55:44,388 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 16:55:44,388 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1716274105] [2021-01-06 16:55:44,389 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 16:55:44,444 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 16:55:44,605 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-01-06 16:55:44,605 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1716274105] [2021-01-06 16:55:44,606 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-01-06 16:55:44,606 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-01-06 16:55:44,608 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [488603931] [2021-01-06 16:55:44,610 INFO L461 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-01-06 16:55:44,610 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 16:55:44,613 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-01-06 16:55:44,614 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-01-06 16:55:44,615 INFO L87 Difference]: Start difference. First operand 9 states and 10 transitions. Second operand 4 states. [2021-01-06 16:55:44,673 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 16:55:44,673 INFO L93 Difference]: Finished difference Result 16 states and 18 transitions. [2021-01-06 16:55:44,674 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-01-06 16:55:44,674 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 6 [2021-01-06 16:55:44,674 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 16:55:44,675 INFO L225 Difference]: With dead ends: 16 [2021-01-06 16:55:44,675 INFO L226 Difference]: Without dead ends: 12 [2021-01-06 16:55:44,676 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-01-06 16:55:44,677 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12 states. [2021-01-06 16:55:44,679 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12 to 12. [2021-01-06 16:55:44,680 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 12 states. [2021-01-06 16:55:44,680 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 14 transitions. [2021-01-06 16:55:44,681 INFO L78 Accepts]: Start accepts. Automaton has 12 states and 14 transitions. Word has length 6 [2021-01-06 16:55:44,681 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 16:55:44,681 INFO L481 AbstractCegarLoop]: Abstraction has 12 states and 14 transitions. [2021-01-06 16:55:44,681 INFO L482 AbstractCegarLoop]: Interpolant automaton has 4 states. [2021-01-06 16:55:44,681 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states and 14 transitions. [2021-01-06 16:55:44,682 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2021-01-06 16:55:44,682 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 16:55:44,682 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-01-06 16:55:44,682 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-01-06 16:55:44,683 INFO L429 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 16:55:44,683 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 16:55:44,684 INFO L82 PathProgramCache]: Analyzing trace with hash 584467323, now seen corresponding path program 1 times [2021-01-06 16:55:44,684 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 16:55:44,684 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1836552101] [2021-01-06 16:55:44,684 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 16:55:44,708 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 16:55:44,764 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-01-06 16:55:44,765 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1836552101] [2021-01-06 16:55:44,765 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-01-06 16:55:44,765 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-01-06 16:55:44,766 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [989943919] [2021-01-06 16:55:44,766 INFO L461 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-01-06 16:55:44,766 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 16:55:44,767 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-01-06 16:55:44,768 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-01-06 16:55:44,768 INFO L87 Difference]: Start difference. First operand 12 states and 14 transitions. Second operand 3 states. [2021-01-06 16:55:44,793 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 16:55:44,794 INFO L93 Difference]: Finished difference Result 22 states and 26 transitions. [2021-01-06 16:55:44,795 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-01-06 16:55:44,795 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 9 [2021-01-06 16:55:44,795 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 16:55:44,796 INFO L225 Difference]: With dead ends: 22 [2021-01-06 16:55:44,796 INFO L226 Difference]: Without dead ends: 15 [2021-01-06 16:55:44,797 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 2 SyntacticMatches, 2 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-01-06 16:55:44,797 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2021-01-06 16:55:44,800 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 14. [2021-01-06 16:55:44,800 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2021-01-06 16:55:44,801 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 16 transitions. [2021-01-06 16:55:44,801 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 16 transitions. Word has length 9 [2021-01-06 16:55:44,802 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 16:55:44,802 INFO L481 AbstractCegarLoop]: Abstraction has 14 states and 16 transitions. [2021-01-06 16:55:44,802 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2021-01-06 16:55:44,802 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 16 transitions. [2021-01-06 16:55:44,803 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-01-06 16:55:44,803 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 16:55:44,803 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2021-01-06 16:55:44,803 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-01-06 16:55:44,803 INFO L429 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 16:55:44,804 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 16:55:44,804 INFO L82 PathProgramCache]: Analyzing trace with hash -2007312204, now seen corresponding path program 1 times [2021-01-06 16:55:44,805 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 16:55:44,805 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1394139427] [2021-01-06 16:55:44,805 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 16:55:44,827 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 16:55:44,931 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 3 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-01-06 16:55:44,931 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1394139427] [2021-01-06 16:55:44,932 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [456414002] [2021-01-06 16:55:44,932 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-01-06 16:55:45,008 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 16:55:45,010 INFO L263 TraceCheckSpWp]: Trace formula consists of 55 conjuncts, 5 conjunts are in the unsatisfiable core [2021-01-06 16:55:45,016 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-01-06 16:55:45,066 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 3 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-01-06 16:55:45,067 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-01-06 16:55:45,067 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 5 [2021-01-06 16:55:45,067 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1602909645] [2021-01-06 16:55:45,068 INFO L461 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-01-06 16:55:45,068 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 16:55:45,069 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-01-06 16:55:45,070 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-01-06 16:55:45,070 INFO L87 Difference]: Start difference. First operand 14 states and 16 transitions. Second operand 5 states. [2021-01-06 16:55:45,119 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 16:55:45,119 INFO L93 Difference]: Finished difference Result 25 states and 29 transitions. [2021-01-06 16:55:45,121 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-01-06 16:55:45,121 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 12 [2021-01-06 16:55:45,121 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 16:55:45,122 INFO L225 Difference]: With dead ends: 25 [2021-01-06 16:55:45,122 INFO L226 Difference]: Without dead ends: 18 [2021-01-06 16:55:45,123 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 13 SyntacticMatches, 1 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-01-06 16:55:45,123 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2021-01-06 16:55:45,127 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 17. [2021-01-06 16:55:45,128 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2021-01-06 16:55:45,128 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 19 transitions. [2021-01-06 16:55:45,128 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 19 transitions. Word has length 12 [2021-01-06 16:55:45,129 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 16:55:45,129 INFO L481 AbstractCegarLoop]: Abstraction has 17 states and 19 transitions. [2021-01-06 16:55:45,129 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2021-01-06 16:55:45,129 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 19 transitions. [2021-01-06 16:55:45,130 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2021-01-06 16:55:45,130 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 16:55:45,130 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 1, 1, 1, 1, 1, 1, 1] [2021-01-06 16:55:45,346 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,2 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-01-06 16:55:45,347 INFO L429 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 16:55:45,349 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 16:55:45,349 INFO L82 PathProgramCache]: Analyzing trace with hash 1210846427, now seen corresponding path program 2 times [2021-01-06 16:55:45,350 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 16:55:45,350 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [996059088] [2021-01-06 16:55:45,350 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 16:55:45,374 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 16:55:45,492 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 5 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-01-06 16:55:45,493 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [996059088] [2021-01-06 16:55:45,493 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [12437122] [2021-01-06 16:55:45,493 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-01-06 16:55:45,564 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-01-06 16:55:45,564 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-01-06 16:55:45,566 INFO L263 TraceCheckSpWp]: Trace formula consists of 59 conjuncts, 7 conjunts are in the unsatisfiable core [2021-01-06 16:55:45,567 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-01-06 16:55:45,663 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 5 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-01-06 16:55:45,664 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-01-06 16:55:45,664 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 6 [2021-01-06 16:55:45,665 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [577828503] [2021-01-06 16:55:45,665 INFO L461 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-01-06 16:55:45,666 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 16:55:45,667 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-01-06 16:55:45,667 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-01-06 16:55:45,667 INFO L87 Difference]: Start difference. First operand 17 states and 19 transitions. Second operand 6 states. [2021-01-06 16:55:45,747 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 16:55:45,747 INFO L93 Difference]: Finished difference Result 28 states and 32 transitions. [2021-01-06 16:55:45,748 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-01-06 16:55:45,748 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 15 [2021-01-06 16:55:45,749 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 16:55:45,749 INFO L225 Difference]: With dead ends: 28 [2021-01-06 16:55:45,749 INFO L226 Difference]: Without dead ends: 21 [2021-01-06 16:55:45,750 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 15 SyntacticMatches, 2 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-01-06 16:55:45,751 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2021-01-06 16:55:45,755 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 20. [2021-01-06 16:55:45,755 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2021-01-06 16:55:45,756 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 22 transitions. [2021-01-06 16:55:45,756 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 22 transitions. Word has length 15 [2021-01-06 16:55:45,757 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 16:55:45,757 INFO L481 AbstractCegarLoop]: Abstraction has 20 states and 22 transitions. [2021-01-06 16:55:45,757 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2021-01-06 16:55:45,757 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 22 transitions. [2021-01-06 16:55:45,758 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2021-01-06 16:55:45,758 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 16:55:45,758 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 3, 1, 1, 1, 1, 1, 1, 1] [2021-01-06 16:55:45,972 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-01-06 16:55:45,973 INFO L429 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 16:55:45,974 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 16:55:45,974 INFO L82 PathProgramCache]: Analyzing trace with hash 1114641236, now seen corresponding path program 3 times [2021-01-06 16:55:45,975 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 16:55:45,975 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1291265903] [2021-01-06 16:55:45,975 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 16:55:45,999 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 16:55:46,232 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 7 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-01-06 16:55:46,234 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1291265903] [2021-01-06 16:55:46,234 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [778939617] [2021-01-06 16:55:46,235 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-01-06 16:55:46,327 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-01-06 16:55:46,327 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-01-06 16:55:46,328 INFO L263 TraceCheckSpWp]: Trace formula consists of 51 conjuncts, 10 conjunts are in the unsatisfiable core [2021-01-06 16:55:46,331 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-01-06 16:55:46,430 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-01-06 16:55:46,431 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-01-06 16:55:46,431 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5] total 9 [2021-01-06 16:55:46,432 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2123359131] [2021-01-06 16:55:46,436 INFO L461 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-01-06 16:55:46,437 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 16:55:46,438 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-01-06 16:55:46,439 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=54, Unknown=0, NotChecked=0, Total=72 [2021-01-06 16:55:46,439 INFO L87 Difference]: Start difference. First operand 20 states and 22 transitions. Second operand 9 states. [2021-01-06 16:55:46,711 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 16:55:46,711 INFO L93 Difference]: Finished difference Result 36 states and 42 transitions. [2021-01-06 16:55:46,712 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-01-06 16:55:46,712 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 18 [2021-01-06 16:55:46,713 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 16:55:46,713 INFO L225 Difference]: With dead ends: 36 [2021-01-06 16:55:46,713 INFO L226 Difference]: Without dead ends: 27 [2021-01-06 16:55:46,715 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 17 SyntacticMatches, 1 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=44, Invalid=138, Unknown=0, NotChecked=0, Total=182 [2021-01-06 16:55:46,715 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2021-01-06 16:55:46,719 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 26. [2021-01-06 16:55:46,720 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2021-01-06 16:55:46,721 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 29 transitions. [2021-01-06 16:55:46,721 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 29 transitions. Word has length 18 [2021-01-06 16:55:46,721 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 16:55:46,721 INFO L481 AbstractCegarLoop]: Abstraction has 26 states and 29 transitions. [2021-01-06 16:55:46,722 INFO L482 AbstractCegarLoop]: Interpolant automaton has 9 states. [2021-01-06 16:55:46,722 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 29 transitions. [2021-01-06 16:55:46,722 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-01-06 16:55:46,722 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 16:55:46,723 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 4, 2, 1, 1, 1, 1, 1, 1] [2021-01-06 16:55:46,934 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-01-06 16:55:46,935 INFO L429 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 16:55:46,936 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 16:55:46,936 INFO L82 PathProgramCache]: Analyzing trace with hash 1770911730, now seen corresponding path program 4 times [2021-01-06 16:55:46,937 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 16:55:46,937 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1559753794] [2021-01-06 16:55:46,937 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 16:55:46,961 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 16:55:47,126 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 23 proven. 26 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-01-06 16:55:47,126 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1559753794] [2021-01-06 16:55:47,126 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [518616542] [2021-01-06 16:55:47,127 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-01-06 16:55:47,198 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-01-06 16:55:47,199 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-01-06 16:55:47,200 INFO L263 TraceCheckSpWp]: Trace formula consists of 73 conjuncts, 11 conjunts are in the unsatisfiable core [2021-01-06 16:55:47,201 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-01-06 16:55:47,304 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 23 proven. 26 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-01-06 16:55:47,304 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-01-06 16:55:47,304 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 8 [2021-01-06 16:55:47,305 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [42491890] [2021-01-06 16:55:47,305 INFO L461 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-01-06 16:55:47,305 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 16:55:47,306 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-01-06 16:55:47,306 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=38, Unknown=0, NotChecked=0, Total=56 [2021-01-06 16:55:47,307 INFO L87 Difference]: Start difference. First operand 26 states and 29 transitions. Second operand 8 states. [2021-01-06 16:55:47,433 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 16:55:47,433 INFO L93 Difference]: Finished difference Result 40 states and 46 transitions. [2021-01-06 16:55:47,434 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-01-06 16:55:47,434 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 24 [2021-01-06 16:55:47,434 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 16:55:47,435 INFO L225 Difference]: With dead ends: 40 [2021-01-06 16:55:47,435 INFO L226 Difference]: Without dead ends: 30 [2021-01-06 16:55:47,436 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 24 SyntacticMatches, 2 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=18, Invalid=38, Unknown=0, NotChecked=0, Total=56 [2021-01-06 16:55:47,436 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2021-01-06 16:55:47,440 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 29. [2021-01-06 16:55:47,441 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2021-01-06 16:55:47,442 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 32 transitions. [2021-01-06 16:55:47,442 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 32 transitions. Word has length 24 [2021-01-06 16:55:47,442 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 16:55:47,442 INFO L481 AbstractCegarLoop]: Abstraction has 29 states and 32 transitions. [2021-01-06 16:55:47,442 INFO L482 AbstractCegarLoop]: Interpolant automaton has 8 states. [2021-01-06 16:55:47,443 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 32 transitions. [2021-01-06 16:55:47,443 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2021-01-06 16:55:47,443 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 16:55:47,444 INFO L422 BasicCegarLoop]: trace histogram [7, 7, 5, 2, 1, 1, 1, 1, 1, 1] [2021-01-06 16:55:47,658 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-01-06 16:55:47,659 INFO L429 AbstractCegarLoop]: === Iteration 8 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 16:55:47,660 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 16:55:47,661 INFO L82 PathProgramCache]: Analyzing trace with hash -349754983, now seen corresponding path program 5 times [2021-01-06 16:55:47,662 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 16:55:47,662 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1450592806] [2021-01-06 16:55:47,662 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 16:55:47,716 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 16:55:47,949 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 28 proven. 40 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-01-06 16:55:47,950 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1450592806] [2021-01-06 16:55:47,950 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1538128431] [2021-01-06 16:55:47,950 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-01-06 16:55:48,127 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 8 check-sat command(s) [2021-01-06 16:55:48,127 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-01-06 16:55:48,130 INFO L263 TraceCheckSpWp]: Trace formula consists of 77 conjuncts, 20 conjunts are in the unsatisfiable core [2021-01-06 16:55:48,132 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-01-06 16:55:48,309 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 28 proven. 40 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-01-06 16:55:48,309 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-01-06 16:55:48,310 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9] total 10 [2021-01-06 16:55:48,310 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [267936248] [2021-01-06 16:55:48,311 INFO L461 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-01-06 16:55:48,311 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 16:55:48,312 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-01-06 16:55:48,312 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=65, Unknown=0, NotChecked=0, Total=90 [2021-01-06 16:55:48,312 INFO L87 Difference]: Start difference. First operand 29 states and 32 transitions. Second operand 10 states. [2021-01-06 16:55:48,471 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 16:55:48,471 INFO L93 Difference]: Finished difference Result 43 states and 49 transitions. [2021-01-06 16:55:48,471 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-01-06 16:55:48,472 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 27 [2021-01-06 16:55:48,472 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 16:55:48,473 INFO L225 Difference]: With dead ends: 43 [2021-01-06 16:55:48,473 INFO L226 Difference]: Without dead ends: 33 [2021-01-06 16:55:48,473 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 22 SyntacticMatches, 6 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=25, Invalid=65, Unknown=0, NotChecked=0, Total=90 [2021-01-06 16:55:48,474 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2021-01-06 16:55:48,478 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 32. [2021-01-06 16:55:48,478 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2021-01-06 16:55:48,479 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 35 transitions. [2021-01-06 16:55:48,479 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 35 transitions. Word has length 27 [2021-01-06 16:55:48,479 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 16:55:48,480 INFO L481 AbstractCegarLoop]: Abstraction has 32 states and 35 transitions. [2021-01-06 16:55:48,480 INFO L482 AbstractCegarLoop]: Interpolant automaton has 10 states. [2021-01-06 16:55:48,480 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 35 transitions. [2021-01-06 16:55:48,481 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2021-01-06 16:55:48,481 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 16:55:48,481 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 6, 2, 1, 1, 1, 1, 1, 1] [2021-01-06 16:55:48,685 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,6 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-01-06 16:55:48,686 INFO L429 AbstractCegarLoop]: === Iteration 9 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 16:55:48,686 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 16:55:48,687 INFO L82 PathProgramCache]: Analyzing trace with hash 1837122194, now seen corresponding path program 6 times [2021-01-06 16:55:48,687 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 16:55:48,688 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1482093932] [2021-01-06 16:55:48,688 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 16:55:48,714 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 16:55:48,857 INFO L134 CoverageAnalysis]: Checked inductivity of 92 backedges. 33 proven. 57 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-01-06 16:55:48,858 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1482093932] [2021-01-06 16:55:48,858 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1242782668] [2021-01-06 16:55:48,858 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-01-06 16:55:48,940 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2021-01-06 16:55:48,941 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-01-06 16:55:48,942 INFO L263 TraceCheckSpWp]: Trace formula consists of 73 conjuncts, 17 conjunts are in the unsatisfiable core [2021-01-06 16:55:48,944 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-01-06 16:55:49,046 INFO L134 CoverageAnalysis]: Checked inductivity of 92 backedges. 0 proven. 35 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2021-01-06 16:55:49,047 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-01-06 16:55:49,047 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 6] total 13 [2021-01-06 16:55:49,048 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [182274021] [2021-01-06 16:55:49,048 INFO L461 AbstractCegarLoop]: Interpolant automaton has 13 states [2021-01-06 16:55:49,048 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 16:55:49,049 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-01-06 16:55:49,049 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=127, Unknown=0, NotChecked=0, Total=156 [2021-01-06 16:55:49,049 INFO L87 Difference]: Start difference. First operand 32 states and 35 transitions. Second operand 13 states. [2021-01-06 16:55:49,387 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 16:55:49,387 INFO L93 Difference]: Finished difference Result 51 states and 59 transitions. [2021-01-06 16:55:49,388 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-01-06 16:55:49,388 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 30 [2021-01-06 16:55:49,389 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 16:55:49,389 INFO L225 Difference]: With dead ends: 51 [2021-01-06 16:55:49,389 INFO L226 Difference]: Without dead ends: 39 [2021-01-06 16:55:49,390 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 28 SyntacticMatches, 1 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=73, Invalid=347, Unknown=0, NotChecked=0, Total=420 [2021-01-06 16:55:49,391 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2021-01-06 16:55:49,395 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 38. [2021-01-06 16:55:49,395 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2021-01-06 16:55:49,396 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 42 transitions. [2021-01-06 16:55:49,396 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 42 transitions. Word has length 30 [2021-01-06 16:55:49,396 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 16:55:49,397 INFO L481 AbstractCegarLoop]: Abstraction has 38 states and 42 transitions. [2021-01-06 16:55:49,397 INFO L482 AbstractCegarLoop]: Interpolant automaton has 13 states. [2021-01-06 16:55:49,397 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 42 transitions. [2021-01-06 16:55:49,398 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2021-01-06 16:55:49,398 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 16:55:49,398 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 7, 3, 1, 1, 1, 1, 1, 1] [2021-01-06 16:55:49,613 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-01-06 16:55:49,614 INFO L429 AbstractCegarLoop]: === Iteration 10 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 16:55:49,615 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 16:55:49,615 INFO L82 PathProgramCache]: Analyzing trace with hash -1047213452, now seen corresponding path program 7 times [2021-01-06 16:55:49,616 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 16:55:49,616 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [846611465] [2021-01-06 16:55:49,616 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 16:55:49,639 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 16:55:49,783 INFO L134 CoverageAnalysis]: Checked inductivity of 145 backedges. 61 proven. 77 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-01-06 16:55:49,784 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [846611465] [2021-01-06 16:55:49,784 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [146710412] [2021-01-06 16:55:49,784 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-01-06 16:55:49,843 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 16:55:49,844 INFO L263 TraceCheckSpWp]: Trace formula consists of 91 conjuncts, 17 conjunts are in the unsatisfiable core [2021-01-06 16:55:49,846 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-01-06 16:55:49,936 INFO L134 CoverageAnalysis]: Checked inductivity of 145 backedges. 61 proven. 77 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-01-06 16:55:49,936 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-01-06 16:55:49,936 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10] total 11 [2021-01-06 16:55:49,937 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2021994585] [2021-01-06 16:55:49,937 INFO L461 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-01-06 16:55:49,937 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 16:55:49,938 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-01-06 16:55:49,938 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2021-01-06 16:55:49,938 INFO L87 Difference]: Start difference. First operand 38 states and 42 transitions. Second operand 11 states. [2021-01-06 16:55:50,107 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 16:55:50,107 INFO L93 Difference]: Finished difference Result 55 states and 63 transitions. [2021-01-06 16:55:50,108 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-01-06 16:55:50,108 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 36 [2021-01-06 16:55:50,108 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 16:55:50,109 INFO L225 Difference]: With dead ends: 55 [2021-01-06 16:55:50,109 INFO L226 Difference]: Without dead ends: 42 [2021-01-06 16:55:50,109 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 36 SyntacticMatches, 2 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2021-01-06 16:55:50,110 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2021-01-06 16:55:50,114 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 41. [2021-01-06 16:55:50,115 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2021-01-06 16:55:50,115 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 45 transitions. [2021-01-06 16:55:50,115 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 45 transitions. Word has length 36 [2021-01-06 16:55:50,116 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 16:55:50,116 INFO L481 AbstractCegarLoop]: Abstraction has 41 states and 45 transitions. [2021-01-06 16:55:50,116 INFO L482 AbstractCegarLoop]: Interpolant automaton has 11 states. [2021-01-06 16:55:50,116 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 45 transitions. [2021-01-06 16:55:50,117 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2021-01-06 16:55:50,117 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 16:55:50,117 INFO L422 BasicCegarLoop]: trace histogram [11, 11, 8, 3, 1, 1, 1, 1, 1, 1] [2021-01-06 16:55:50,332 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2021-01-06 16:55:50,332 INFO L429 AbstractCegarLoop]: === Iteration 11 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 16:55:50,333 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 16:55:50,333 INFO L82 PathProgramCache]: Analyzing trace with hash 1365621147, now seen corresponding path program 8 times [2021-01-06 16:55:50,333 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 16:55:50,333 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1177956461] [2021-01-06 16:55:50,334 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 16:55:50,370 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 16:55:50,606 INFO L134 CoverageAnalysis]: Checked inductivity of 176 backedges. 69 proven. 100 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-01-06 16:55:50,606 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1177956461] [2021-01-06 16:55:50,611 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [264536112] [2021-01-06 16:55:50,612 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-01-06 16:55:50,670 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-01-06 16:55:50,670 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-01-06 16:55:50,672 INFO L263 TraceCheckSpWp]: Trace formula consists of 95 conjuncts, 19 conjunts are in the unsatisfiable core [2021-01-06 16:55:50,675 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-01-06 16:55:50,777 INFO L134 CoverageAnalysis]: Checked inductivity of 176 backedges. 69 proven. 100 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-01-06 16:55:50,778 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-01-06 16:55:50,779 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 12 [2021-01-06 16:55:50,780 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [236490934] [2021-01-06 16:55:50,781 INFO L461 AbstractCegarLoop]: Interpolant automaton has 12 states [2021-01-06 16:55:50,781 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 16:55:50,781 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-01-06 16:55:50,782 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2021-01-06 16:55:50,782 INFO L87 Difference]: Start difference. First operand 41 states and 45 transitions. Second operand 12 states. [2021-01-06 16:55:50,989 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 16:55:50,989 INFO L93 Difference]: Finished difference Result 58 states and 66 transitions. [2021-01-06 16:55:50,989 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-01-06 16:55:50,990 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 39 [2021-01-06 16:55:50,990 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 16:55:50,993 INFO L225 Difference]: With dead ends: 58 [2021-01-06 16:55:50,993 INFO L226 Difference]: Without dead ends: 45 [2021-01-06 16:55:50,994 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 51 GetRequests, 39 SyntacticMatches, 2 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2021-01-06 16:55:50,995 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2021-01-06 16:55:51,009 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 44. [2021-01-06 16:55:51,009 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2021-01-06 16:55:51,010 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 48 transitions. [2021-01-06 16:55:51,010 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 48 transitions. Word has length 39 [2021-01-06 16:55:51,010 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 16:55:51,010 INFO L481 AbstractCegarLoop]: Abstraction has 44 states and 48 transitions. [2021-01-06 16:55:51,011 INFO L482 AbstractCegarLoop]: Interpolant automaton has 12 states. [2021-01-06 16:55:51,011 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 48 transitions. [2021-01-06 16:55:51,012 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2021-01-06 16:55:51,012 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 16:55:51,012 INFO L422 BasicCegarLoop]: trace histogram [12, 12, 9, 3, 1, 1, 1, 1, 1, 1] [2021-01-06 16:55:51,226 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2021-01-06 16:55:51,227 INFO L429 AbstractCegarLoop]: === Iteration 12 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 16:55:51,228 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 16:55:51,228 INFO L82 PathProgramCache]: Analyzing trace with hash 1548494100, now seen corresponding path program 9 times [2021-01-06 16:55:51,228 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 16:55:51,228 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2143161032] [2021-01-06 16:55:51,229 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 16:55:51,262 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 16:55:51,480 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 77 proven. 126 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-01-06 16:55:51,480 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2143161032] [2021-01-06 16:55:51,480 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1241736483] [2021-01-06 16:55:51,480 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-01-06 16:55:51,527 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2021-01-06 16:55:51,528 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-01-06 16:55:51,529 INFO L263 TraceCheckSpWp]: Trace formula consists of 67 conjuncts, 16 conjunts are in the unsatisfiable core [2021-01-06 16:55:51,535 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-01-06 16:55:51,667 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 84 refuted. 0 times theorem prover too weak. 126 trivial. 0 not checked. [2021-01-06 16:55:51,668 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-01-06 16:55:51,668 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 7] total 17 [2021-01-06 16:55:51,668 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1093784047] [2021-01-06 16:55:51,672 INFO L461 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-01-06 16:55:51,672 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 16:55:51,673 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-01-06 16:55:51,673 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=40, Invalid=232, Unknown=0, NotChecked=0, Total=272 [2021-01-06 16:55:51,673 INFO L87 Difference]: Start difference. First operand 44 states and 48 transitions. Second operand 17 states. [2021-01-06 16:55:52,206 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 16:55:52,207 INFO L93 Difference]: Finished difference Result 66 states and 76 transitions. [2021-01-06 16:55:52,207 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-01-06 16:55:52,207 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 42 [2021-01-06 16:55:52,208 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 16:55:52,209 INFO L225 Difference]: With dead ends: 66 [2021-01-06 16:55:52,209 INFO L226 Difference]: Without dead ends: 51 [2021-01-06 16:55:52,210 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 66 GetRequests, 39 SyntacticMatches, 1 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 60 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=102, Invalid=654, Unknown=0, NotChecked=0, Total=756 [2021-01-06 16:55:52,211 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2021-01-06 16:55:52,215 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 50. [2021-01-06 16:55:52,215 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 50 states. [2021-01-06 16:55:52,216 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 55 transitions. [2021-01-06 16:55:52,216 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 55 transitions. Word has length 42 [2021-01-06 16:55:52,217 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 16:55:52,217 INFO L481 AbstractCegarLoop]: Abstraction has 50 states and 55 transitions. [2021-01-06 16:55:52,217 INFO L482 AbstractCegarLoop]: Interpolant automaton has 17 states. [2021-01-06 16:55:52,217 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 55 transitions. [2021-01-06 16:55:52,218 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2021-01-06 16:55:52,218 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 16:55:52,218 INFO L422 BasicCegarLoop]: trace histogram [14, 14, 10, 4, 1, 1, 1, 1, 1, 1] [2021-01-06 16:55:52,432 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,10 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-01-06 16:55:52,433 INFO L429 AbstractCegarLoop]: === Iteration 13 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 16:55:52,434 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 16:55:52,434 INFO L82 PathProgramCache]: Analyzing trace with hash 516305714, now seen corresponding path program 10 times [2021-01-06 16:55:52,434 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 16:55:52,435 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1136295826] [2021-01-06 16:55:52,435 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 16:55:52,459 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 16:55:52,676 INFO L134 CoverageAnalysis]: Checked inductivity of 287 backedges. 117 proven. 155 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-01-06 16:55:52,677 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1136295826] [2021-01-06 16:55:52,677 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [720085148] [2021-01-06 16:55:52,677 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-01-06 16:55:52,743 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-01-06 16:55:52,743 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-01-06 16:55:52,745 INFO L263 TraceCheckSpWp]: Trace formula consists of 109 conjuncts, 23 conjunts are in the unsatisfiable core [2021-01-06 16:55:52,747 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-01-06 16:55:52,850 INFO L134 CoverageAnalysis]: Checked inductivity of 287 backedges. 117 proven. 155 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-01-06 16:55:52,850 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-01-06 16:55:52,850 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13] total 14 [2021-01-06 16:55:52,851 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1340425426] [2021-01-06 16:55:52,851 INFO L461 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-01-06 16:55:52,851 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 16:55:52,852 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-01-06 16:55:52,852 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=146, Unknown=0, NotChecked=0, Total=182 [2021-01-06 16:55:52,853 INFO L87 Difference]: Start difference. First operand 50 states and 55 transitions. Second operand 14 states. [2021-01-06 16:55:53,123 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 16:55:53,123 INFO L93 Difference]: Finished difference Result 70 states and 80 transitions. [2021-01-06 16:55:53,123 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-01-06 16:55:53,123 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 48 [2021-01-06 16:55:53,124 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 16:55:53,124 INFO L225 Difference]: With dead ends: 70 [2021-01-06 16:55:53,124 INFO L226 Difference]: Without dead ends: 54 [2021-01-06 16:55:53,125 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 48 SyntacticMatches, 2 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=36, Invalid=146, Unknown=0, NotChecked=0, Total=182 [2021-01-06 16:55:53,125 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2021-01-06 16:55:53,130 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 53. [2021-01-06 16:55:53,130 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53 states. [2021-01-06 16:55:53,131 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 58 transitions. [2021-01-06 16:55:53,131 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 58 transitions. Word has length 48 [2021-01-06 16:55:53,131 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 16:55:53,132 INFO L481 AbstractCegarLoop]: Abstraction has 53 states and 58 transitions. [2021-01-06 16:55:53,132 INFO L482 AbstractCegarLoop]: Interpolant automaton has 14 states. [2021-01-06 16:55:53,132 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 58 transitions. [2021-01-06 16:55:53,132 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2021-01-06 16:55:53,133 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 16:55:53,133 INFO L422 BasicCegarLoop]: trace histogram [15, 15, 11, 4, 1, 1, 1, 1, 1, 1] [2021-01-06 16:55:53,338 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12,11 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-01-06 16:55:53,339 INFO L429 AbstractCegarLoop]: === Iteration 14 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 16:55:53,342 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 16:55:53,343 INFO L82 PathProgramCache]: Analyzing trace with hash 530489305, now seen corresponding path program 11 times [2021-01-06 16:55:53,343 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 16:55:53,343 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1138043732] [2021-01-06 16:55:53,343 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 16:55:53,365 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 16:55:53,613 INFO L134 CoverageAnalysis]: Checked inductivity of 330 backedges. 128 proven. 187 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-01-06 16:55:53,613 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1138043732] [2021-01-06 16:55:53,613 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [989320861] [2021-01-06 16:55:53,614 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-01-06 16:55:54,711 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 16 check-sat command(s) [2021-01-06 16:55:54,712 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-01-06 16:55:54,714 INFO L263 TraceCheckSpWp]: Trace formula consists of 113 conjuncts, 34 conjunts are in the unsatisfiable core [2021-01-06 16:55:54,717 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-01-06 16:55:54,968 INFO L134 CoverageAnalysis]: Checked inductivity of 330 backedges. 128 proven. 187 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-01-06 16:55:54,969 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-01-06 16:55:54,969 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14] total 15 [2021-01-06 16:55:54,975 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1071727257] [2021-01-06 16:55:54,976 INFO L461 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-01-06 16:55:54,976 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 16:55:54,977 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-01-06 16:55:54,977 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=171, Unknown=0, NotChecked=0, Total=210 [2021-01-06 16:55:54,977 INFO L87 Difference]: Start difference. First operand 53 states and 58 transitions. Second operand 15 states. [2021-01-06 16:55:55,298 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 16:55:55,298 INFO L93 Difference]: Finished difference Result 73 states and 83 transitions. [2021-01-06 16:55:55,299 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-01-06 16:55:55,299 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 51 [2021-01-06 16:55:55,300 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 16:55:55,301 INFO L225 Difference]: With dead ends: 73 [2021-01-06 16:55:55,301 INFO L226 Difference]: Without dead ends: 57 [2021-01-06 16:55:55,302 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 66 GetRequests, 42 SyntacticMatches, 11 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=39, Invalid=171, Unknown=0, NotChecked=0, Total=210 [2021-01-06 16:55:55,302 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2021-01-06 16:55:55,309 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 56. [2021-01-06 16:55:55,309 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2021-01-06 16:55:55,311 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 61 transitions. [2021-01-06 16:55:55,311 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 61 transitions. Word has length 51 [2021-01-06 16:55:55,311 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 16:55:55,311 INFO L481 AbstractCegarLoop]: Abstraction has 56 states and 61 transitions. [2021-01-06 16:55:55,311 INFO L482 AbstractCegarLoop]: Interpolant automaton has 15 states. [2021-01-06 16:55:55,311 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 61 transitions. [2021-01-06 16:55:55,317 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2021-01-06 16:55:55,317 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 16:55:55,317 INFO L422 BasicCegarLoop]: trace histogram [16, 16, 12, 4, 1, 1, 1, 1, 1, 1] [2021-01-06 16:55:55,522 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2021-01-06 16:55:55,523 INFO L429 AbstractCegarLoop]: === Iteration 15 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 16:55:55,524 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 16:55:55,524 INFO L82 PathProgramCache]: Analyzing trace with hash -2127913518, now seen corresponding path program 12 times [2021-01-06 16:55:55,524 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 16:55:55,524 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2113855682] [2021-01-06 16:55:55,525 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 16:55:55,541 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 16:55:55,784 INFO L134 CoverageAnalysis]: Checked inductivity of 376 backedges. 139 proven. 222 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-01-06 16:55:55,785 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2113855682] [2021-01-06 16:55:55,785 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1779230388] [2021-01-06 16:55:55,785 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-01-06 16:55:55,967 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 13 check-sat command(s) [2021-01-06 16:55:55,967 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-01-06 16:55:55,969 INFO L263 TraceCheckSpWp]: Trace formula consists of 101 conjuncts, 22 conjunts are in the unsatisfiable core [2021-01-06 16:55:55,971 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-01-06 16:55:56,183 INFO L134 CoverageAnalysis]: Checked inductivity of 376 backedges. 0 proven. 154 refuted. 0 times theorem prover too weak. 222 trivial. 0 not checked. [2021-01-06 16:55:56,184 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-01-06 16:55:56,184 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 8] total 21 [2021-01-06 16:55:56,184 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1924881382] [2021-01-06 16:55:56,185 INFO L461 AbstractCegarLoop]: Interpolant automaton has 21 states [2021-01-06 16:55:56,185 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 16:55:56,186 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-01-06 16:55:56,186 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=369, Unknown=0, NotChecked=0, Total=420 [2021-01-06 16:55:56,187 INFO L87 Difference]: Start difference. First operand 56 states and 61 transitions. Second operand 21 states. [2021-01-06 16:55:57,081 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 16:55:57,082 INFO L93 Difference]: Finished difference Result 81 states and 93 transitions. [2021-01-06 16:55:57,082 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2021-01-06 16:55:57,082 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 54 [2021-01-06 16:55:57,082 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 16:55:57,084 INFO L225 Difference]: With dead ends: 81 [2021-01-06 16:55:57,084 INFO L226 Difference]: Without dead ends: 63 [2021-01-06 16:55:57,090 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 84 GetRequests, 50 SyntacticMatches, 1 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 97 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=131, Invalid=1059, Unknown=0, NotChecked=0, Total=1190 [2021-01-06 16:55:57,091 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2021-01-06 16:55:57,101 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 62. [2021-01-06 16:55:57,102 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 62 states. [2021-01-06 16:55:57,106 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 68 transitions. [2021-01-06 16:55:57,106 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 68 transitions. Word has length 54 [2021-01-06 16:55:57,107 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 16:55:57,107 INFO L481 AbstractCegarLoop]: Abstraction has 62 states and 68 transitions. [2021-01-06 16:55:57,108 INFO L482 AbstractCegarLoop]: Interpolant automaton has 21 states. [2021-01-06 16:55:57,108 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 68 transitions. [2021-01-06 16:55:57,110 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2021-01-06 16:55:57,110 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 16:55:57,110 INFO L422 BasicCegarLoop]: trace histogram [18, 18, 13, 5, 1, 1, 1, 1, 1, 1] [2021-01-06 16:55:57,326 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2021-01-06 16:55:57,327 INFO L429 AbstractCegarLoop]: === Iteration 16 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 16:55:57,327 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 16:55:57,327 INFO L82 PathProgramCache]: Analyzing trace with hash 1675152436, now seen corresponding path program 13 times [2021-01-06 16:55:57,328 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 16:55:57,328 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [41679669] [2021-01-06 16:55:57,328 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 16:55:57,361 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 16:55:57,667 INFO L134 CoverageAnalysis]: Checked inductivity of 477 backedges. 191 proven. 260 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2021-01-06 16:55:57,667 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [41679669] [2021-01-06 16:55:57,669 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1816340800] [2021-01-06 16:55:57,669 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-01-06 16:55:57,729 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 16:55:57,730 INFO L263 TraceCheckSpWp]: Trace formula consists of 127 conjuncts, 29 conjunts are in the unsatisfiable core [2021-01-06 16:55:57,732 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-01-06 16:55:57,849 INFO L134 CoverageAnalysis]: Checked inductivity of 477 backedges. 191 proven. 260 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2021-01-06 16:55:57,850 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-01-06 16:55:57,850 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16] total 17 [2021-01-06 16:55:57,850 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [671388967] [2021-01-06 16:55:57,851 INFO L461 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-01-06 16:55:57,851 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 16:55:57,852 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-01-06 16:55:57,853 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=227, Unknown=0, NotChecked=0, Total=272 [2021-01-06 16:55:57,853 INFO L87 Difference]: Start difference. First operand 62 states and 68 transitions. Second operand 17 states. [2021-01-06 16:55:58,303 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 16:55:58,303 INFO L93 Difference]: Finished difference Result 85 states and 97 transitions. [2021-01-06 16:55:58,304 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-01-06 16:55:58,304 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 60 [2021-01-06 16:55:58,304 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 16:55:58,305 INFO L225 Difference]: With dead ends: 85 [2021-01-06 16:55:58,305 INFO L226 Difference]: Without dead ends: 66 [2021-01-06 16:55:58,306 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 77 GetRequests, 60 SyntacticMatches, 2 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=45, Invalid=227, Unknown=0, NotChecked=0, Total=272 [2021-01-06 16:55:58,306 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2021-01-06 16:55:58,310 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 65. [2021-01-06 16:55:58,310 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 65 states. [2021-01-06 16:55:58,311 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 71 transitions. [2021-01-06 16:55:58,311 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 71 transitions. Word has length 60 [2021-01-06 16:55:58,311 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 16:55:58,312 INFO L481 AbstractCegarLoop]: Abstraction has 65 states and 71 transitions. [2021-01-06 16:55:58,312 INFO L482 AbstractCegarLoop]: Interpolant automaton has 17 states. [2021-01-06 16:55:58,312 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 71 transitions. [2021-01-06 16:55:58,312 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2021-01-06 16:55:58,312 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 16:55:58,313 INFO L422 BasicCegarLoop]: trace histogram [19, 19, 14, 5, 1, 1, 1, 1, 1, 1] [2021-01-06 16:55:58,523 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2021-01-06 16:55:58,525 INFO L429 AbstractCegarLoop]: === Iteration 17 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 16:55:58,526 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 16:55:58,527 INFO L82 PathProgramCache]: Analyzing trace with hash -1092061605, now seen corresponding path program 14 times [2021-01-06 16:55:58,527 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 16:55:58,527 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1429899197] [2021-01-06 16:55:58,527 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 16:55:58,545 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 16:55:58,840 INFO L134 CoverageAnalysis]: Checked inductivity of 532 backedges. 205 proven. 301 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2021-01-06 16:55:58,841 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1429899197] [2021-01-06 16:55:58,841 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [807227328] [2021-01-06 16:55:58,841 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-01-06 16:55:58,903 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-01-06 16:55:58,903 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-01-06 16:55:58,905 INFO L263 TraceCheckSpWp]: Trace formula consists of 131 conjuncts, 31 conjunts are in the unsatisfiable core [2021-01-06 16:55:58,907 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-01-06 16:55:59,025 INFO L134 CoverageAnalysis]: Checked inductivity of 532 backedges. 205 proven. 301 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2021-01-06 16:55:59,025 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-01-06 16:55:59,026 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17] total 18 [2021-01-06 16:55:59,026 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [538822185] [2021-01-06 16:55:59,026 INFO L461 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-01-06 16:55:59,026 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 16:55:59,027 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-01-06 16:55:59,027 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=258, Unknown=0, NotChecked=0, Total=306 [2021-01-06 16:55:59,027 INFO L87 Difference]: Start difference. First operand 65 states and 71 transitions. Second operand 18 states. [2021-01-06 16:55:59,565 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 16:55:59,565 INFO L93 Difference]: Finished difference Result 88 states and 100 transitions. [2021-01-06 16:55:59,566 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-01-06 16:55:59,566 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 63 [2021-01-06 16:55:59,566 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 16:55:59,567 INFO L225 Difference]: With dead ends: 88 [2021-01-06 16:55:59,567 INFO L226 Difference]: Without dead ends: 69 [2021-01-06 16:55:59,568 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 81 GetRequests, 64 SyntacticMatches, 1 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=48, Invalid=258, Unknown=0, NotChecked=0, Total=306 [2021-01-06 16:55:59,569 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2021-01-06 16:55:59,572 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 68. [2021-01-06 16:55:59,573 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 68 states. [2021-01-06 16:55:59,573 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 74 transitions. [2021-01-06 16:55:59,573 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 74 transitions. Word has length 63 [2021-01-06 16:55:59,573 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 16:55:59,574 INFO L481 AbstractCegarLoop]: Abstraction has 68 states and 74 transitions. [2021-01-06 16:55:59,574 INFO L482 AbstractCegarLoop]: Interpolant automaton has 18 states. [2021-01-06 16:55:59,574 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 74 transitions. [2021-01-06 16:55:59,574 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2021-01-06 16:55:59,574 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 16:55:59,575 INFO L422 BasicCegarLoop]: trace histogram [20, 20, 15, 5, 1, 1, 1, 1, 1, 1] [2021-01-06 16:55:59,780 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16,15 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-01-06 16:55:59,781 INFO L429 AbstractCegarLoop]: === Iteration 18 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 16:55:59,782 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 16:55:59,782 INFO L82 PathProgramCache]: Analyzing trace with hash -1563277612, now seen corresponding path program 15 times [2021-01-06 16:55:59,782 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 16:55:59,783 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1322120440] [2021-01-06 16:55:59,783 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 16:55:59,802 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 16:56:00,093 INFO L134 CoverageAnalysis]: Checked inductivity of 590 backedges. 219 proven. 345 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2021-01-06 16:56:00,093 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1322120440] [2021-01-06 16:56:00,093 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [238310970] [2021-01-06 16:56:00,094 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate-bitabs/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 [2021-01-06 16:56:00,168 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 8 check-sat command(s) [2021-01-06 16:56:00,168 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-01-06 16:56:00,170 INFO L263 TraceCheckSpWp]: Trace formula consists of 83 conjuncts, 18 conjunts are in the unsatisfiable core [2021-01-06 16:56:00,171 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-01-06 16:56:00,420 INFO L134 CoverageAnalysis]: Checked inductivity of 590 backedges. 0 proven. 245 refuted. 0 times theorem prover too weak. 345 trivial. 0 not checked. [2021-01-06 16:56:00,420 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-01-06 16:56:00,420 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 9] total 25 [2021-01-06 16:56:00,420 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [875445502] [2021-01-06 16:56:00,421 INFO L461 AbstractCegarLoop]: Interpolant automaton has 25 states [2021-01-06 16:56:00,421 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 16:56:00,421 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-01-06 16:56:00,422 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=62, Invalid=538, Unknown=0, NotChecked=0, Total=600 [2021-01-06 16:56:00,422 INFO L87 Difference]: Start difference. First operand 68 states and 74 transitions. Second operand 25 states. [2021-01-06 16:56:01,813 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 16:56:01,813 INFO L93 Difference]: Finished difference Result 96 states and 110 transitions. [2021-01-06 16:56:01,814 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2021-01-06 16:56:01,814 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 66 [2021-01-06 16:56:01,814 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 16:56:01,815 INFO L225 Difference]: With dead ends: 96 [2021-01-06 16:56:01,815 INFO L226 Difference]: Without dead ends: 75 [2021-01-06 16:56:01,816 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 102 GetRequests, 62 SyntacticMatches, 0 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 143 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=160, Invalid=1562, Unknown=0, NotChecked=0, Total=1722 [2021-01-06 16:56:01,817 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2021-01-06 16:56:01,821 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 74. [2021-01-06 16:56:01,821 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 74 states. [2021-01-06 16:56:01,822 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 74 states to 74 states and 81 transitions. [2021-01-06 16:56:01,822 INFO L78 Accepts]: Start accepts. Automaton has 74 states and 81 transitions. Word has length 66 [2021-01-06 16:56:01,822 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 16:56:01,822 INFO L481 AbstractCegarLoop]: Abstraction has 74 states and 81 transitions. [2021-01-06 16:56:01,822 INFO L482 AbstractCegarLoop]: Interpolant automaton has 25 states. [2021-01-06 16:56:01,823 INFO L276 IsEmpty]: Start isEmpty. Operand 74 states and 81 transitions. [2021-01-06 16:56:01,823 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 73 [2021-01-06 16:56:01,823 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 16:56:01,823 INFO L422 BasicCegarLoop]: trace histogram [22, 22, 16, 6, 1, 1, 1, 1, 1, 1] [2021-01-06 16:56:02,036 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2021-01-06 16:56:02,036 INFO L429 AbstractCegarLoop]: === Iteration 19 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 16:56:02,037 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 16:56:02,037 INFO L82 PathProgramCache]: Analyzing trace with hash -1308926350, now seen corresponding path program 16 times [2021-01-06 16:56:02,038 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 16:56:02,038 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1255916723] [2021-01-06 16:56:02,038 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 16:56:02,069 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 16:56:02,420 INFO L134 CoverageAnalysis]: Checked inductivity of 715 backedges. 283 proven. 392 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2021-01-06 16:56:02,421 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1255916723] [2021-01-06 16:56:02,421 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1939398068] [2021-01-06 16:56:02,421 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate-bitabs/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 [2021-01-06 16:56:02,501 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-01-06 16:56:02,501 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-01-06 16:56:02,502 INFO L263 TraceCheckSpWp]: Trace formula consists of 145 conjuncts, 45 conjunts are in the unsatisfiable core [2021-01-06 16:56:02,504 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-01-06 16:56:02,820 INFO L134 CoverageAnalysis]: Checked inductivity of 715 backedges. 43 proven. 672 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-01-06 16:56:02,820 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-01-06 16:56:02,820 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 24] total 25 [2021-01-06 16:56:02,820 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1100117997] [2021-01-06 16:56:02,821 INFO L461 AbstractCegarLoop]: Interpolant automaton has 25 states [2021-01-06 16:56:02,821 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 16:56:02,821 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-01-06 16:56:02,822 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=64, Invalid=536, Unknown=0, NotChecked=0, Total=600 [2021-01-06 16:56:02,822 INFO L87 Difference]: Start difference. First operand 74 states and 81 transitions. Second operand 25 states. [2021-01-06 16:56:03,892 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 16:56:03,893 INFO L93 Difference]: Finished difference Result 115 states and 134 transitions. [2021-01-06 16:56:03,893 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2021-01-06 16:56:03,894 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 72 [2021-01-06 16:56:03,894 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 16:56:03,895 INFO L225 Difference]: With dead ends: 115 [2021-01-06 16:56:03,895 INFO L226 Difference]: Without dead ends: 93 [2021-01-06 16:56:03,896 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 92 GetRequests, 67 SyntacticMatches, 2 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=64, Invalid=536, Unknown=0, NotChecked=0, Total=600 [2021-01-06 16:56:03,897 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 93 states. [2021-01-06 16:56:03,901 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 93 to 92. [2021-01-06 16:56:03,901 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 92 states. [2021-01-06 16:56:03,901 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 92 states to 92 states and 99 transitions. [2021-01-06 16:56:03,901 INFO L78 Accepts]: Start accepts. Automaton has 92 states and 99 transitions. Word has length 72 [2021-01-06 16:56:03,902 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 16:56:03,902 INFO L481 AbstractCegarLoop]: Abstraction has 92 states and 99 transitions. [2021-01-06 16:56:03,902 INFO L482 AbstractCegarLoop]: Interpolant automaton has 25 states. [2021-01-06 16:56:03,902 INFO L276 IsEmpty]: Start isEmpty. Operand 92 states and 99 transitions. [2021-01-06 16:56:03,903 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 91 [2021-01-06 16:56:03,903 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 16:56:03,903 INFO L422 BasicCegarLoop]: trace histogram [28, 28, 22, 6, 1, 1, 1, 1, 1, 1] [2021-01-06 16:56:04,116 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,17 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-01-06 16:56:04,117 INFO L429 AbstractCegarLoop]: === Iteration 20 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 16:56:04,117 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 16:56:04,117 INFO L82 PathProgramCache]: Analyzing trace with hash 488216146, now seen corresponding path program 17 times [2021-01-06 16:56:04,118 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 16:56:04,118 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [694548184] [2021-01-06 16:56:04,118 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 16:56:04,155 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 16:56:04,731 INFO L134 CoverageAnalysis]: Checked inductivity of 1162 backedges. 385 proven. 737 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2021-01-06 16:56:04,732 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [694548184] [2021-01-06 16:56:04,732 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1666454347] [2021-01-06 16:56:04,732 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate-bitabs/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 [2021-01-06 16:56:13,556 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 29 check-sat command(s) [2021-01-06 16:56:13,557 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-01-06 16:56:13,562 INFO L263 TraceCheckSpWp]: Trace formula consists of 169 conjuncts, 72 conjunts are in the unsatisfiable core [2021-01-06 16:56:13,565 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-01-06 16:56:14,181 INFO L134 CoverageAnalysis]: Checked inductivity of 1162 backedges. 385 proven. 737 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2021-01-06 16:56:14,182 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-01-06 16:56:14,182 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25] total 26 [2021-01-06 16:56:14,182 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1008131862] [2021-01-06 16:56:14,183 INFO L461 AbstractCegarLoop]: Interpolant automaton has 26 states [2021-01-06 16:56:14,183 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 16:56:14,183 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-01-06 16:56:14,184 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=72, Invalid=578, Unknown=0, NotChecked=0, Total=650 [2021-01-06 16:56:14,184 INFO L87 Difference]: Start difference. First operand 92 states and 99 transitions. Second operand 26 states. [2021-01-06 16:56:15,345 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 16:56:15,346 INFO L93 Difference]: Finished difference Result 118 states and 132 transitions. [2021-01-06 16:56:15,346 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2021-01-06 16:56:15,346 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 90 [2021-01-06 16:56:15,347 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 16:56:15,347 INFO L225 Difference]: With dead ends: 118 [2021-01-06 16:56:15,347 INFO L226 Difference]: Without dead ends: 96 [2021-01-06 16:56:15,348 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 116 GetRequests, 69 SyntacticMatches, 23 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 43 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=72, Invalid=578, Unknown=0, NotChecked=0, Total=650 [2021-01-06 16:56:15,349 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 96 states. [2021-01-06 16:56:15,353 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 96 to 95. [2021-01-06 16:56:15,353 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 95 states. [2021-01-06 16:56:15,353 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 95 states to 95 states and 102 transitions. [2021-01-06 16:56:15,354 INFO L78 Accepts]: Start accepts. Automaton has 95 states and 102 transitions. Word has length 90 [2021-01-06 16:56:15,354 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 16:56:15,354 INFO L481 AbstractCegarLoop]: Abstraction has 95 states and 102 transitions. [2021-01-06 16:56:15,354 INFO L482 AbstractCegarLoop]: Interpolant automaton has 26 states. [2021-01-06 16:56:15,354 INFO L276 IsEmpty]: Start isEmpty. Operand 95 states and 102 transitions. [2021-01-06 16:56:15,355 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 94 [2021-01-06 16:56:15,355 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 16:56:15,355 INFO L422 BasicCegarLoop]: trace histogram [29, 29, 23, 6, 1, 1, 1, 1, 1, 1] [2021-01-06 16:56:15,559 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,18 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-01-06 16:56:15,559 INFO L429 AbstractCegarLoop]: === Iteration 21 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 16:56:15,560 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 16:56:15,560 INFO L82 PathProgramCache]: Analyzing trace with hash -1202044359, now seen corresponding path program 18 times [2021-01-06 16:56:15,561 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 16:56:15,561 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [478113335] [2021-01-06 16:56:15,562 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 16:56:15,587 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 16:56:16,182 INFO L134 CoverageAnalysis]: Checked inductivity of 1247 backedges. 402 proven. 805 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2021-01-06 16:56:16,182 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [478113335] [2021-01-06 16:56:16,182 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [726012524] [2021-01-06 16:56:16,182 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate-bitabs/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 [2021-01-06 16:56:16,593 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 19 check-sat command(s) [2021-01-06 16:56:16,593 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-01-06 16:56:16,595 INFO L263 TraceCheckSpWp]: Trace formula consists of 129 conjuncts, 17 conjunts are in the unsatisfiable core [2021-01-06 16:56:16,597 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-01-06 16:56:16,994 INFO L134 CoverageAnalysis]: Checked inductivity of 1247 backedges. 0 proven. 442 refuted. 0 times theorem prover too weak. 805 trivial. 0 not checked. [2021-01-06 16:56:16,994 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-01-06 16:56:16,994 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 10] total 34 [2021-01-06 16:56:16,995 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2068645447] [2021-01-06 16:56:16,997 INFO L461 AbstractCegarLoop]: Interpolant automaton has 34 states [2021-01-06 16:56:16,998 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 16:56:16,998 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2021-01-06 16:56:16,999 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=88, Invalid=1034, Unknown=0, NotChecked=0, Total=1122 [2021-01-06 16:56:16,999 INFO L87 Difference]: Start difference. First operand 95 states and 102 transitions. Second operand 34 states. [2021-01-06 16:56:19,631 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 16:56:19,632 INFO L93 Difference]: Finished difference Result 126 states and 142 transitions. [2021-01-06 16:56:19,632 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2021-01-06 16:56:19,632 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 93 [2021-01-06 16:56:19,632 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 16:56:19,633 INFO L225 Difference]: With dead ends: 126 [2021-01-06 16:56:19,633 INFO L226 Difference]: Without dead ends: 102 [2021-01-06 16:56:19,635 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 145 GetRequests, 87 SyntacticMatches, 1 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 308 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=234, Invalid=3188, Unknown=0, NotChecked=0, Total=3422 [2021-01-06 16:56:19,635 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 102 states. [2021-01-06 16:56:19,640 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 102 to 101. [2021-01-06 16:56:19,640 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 101 states. [2021-01-06 16:56:19,641 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 101 states to 101 states and 109 transitions. [2021-01-06 16:56:19,641 INFO L78 Accepts]: Start accepts. Automaton has 101 states and 109 transitions. Word has length 93 [2021-01-06 16:56:19,641 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 16:56:19,641 INFO L481 AbstractCegarLoop]: Abstraction has 101 states and 109 transitions. [2021-01-06 16:56:19,641 INFO L482 AbstractCegarLoop]: Interpolant automaton has 34 states. [2021-01-06 16:56:19,641 INFO L276 IsEmpty]: Start isEmpty. Operand 101 states and 109 transitions. [2021-01-06 16:56:19,642 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 100 [2021-01-06 16:56:19,642 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 16:56:19,642 INFO L422 BasicCegarLoop]: trace histogram [31, 31, 24, 7, 1, 1, 1, 1, 1, 1] [2021-01-06 16:56:19,849 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable20 [2021-01-06 16:56:19,849 INFO L429 AbstractCegarLoop]: === Iteration 22 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 16:56:19,850 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 16:56:19,850 INFO L82 PathProgramCache]: Analyzing trace with hash 1540324827, now seen corresponding path program 19 times [2021-01-06 16:56:19,851 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 16:56:19,851 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1591868356] [2021-01-06 16:56:19,851 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 16:56:19,879 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 16:56:20,520 INFO L134 CoverageAnalysis]: Checked inductivity of 1426 backedges. 493 proven. 876 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2021-01-06 16:56:20,521 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1591868356] [2021-01-06 16:56:20,521 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1151552123] [2021-01-06 16:56:20,521 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate-bitabs/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 [2021-01-06 16:56:20,601 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 16:56:20,603 INFO L263 TraceCheckSpWp]: Trace formula consists of 183 conjuncts, 51 conjunts are in the unsatisfiable core [2021-01-06 16:56:20,606 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-01-06 16:56:20,774 INFO L134 CoverageAnalysis]: Checked inductivity of 1426 backedges. 493 proven. 876 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2021-01-06 16:56:20,774 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-01-06 16:56:20,774 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 27] total 28 [2021-01-06 16:56:20,775 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1815007961] [2021-01-06 16:56:20,775 INFO L461 AbstractCegarLoop]: Interpolant automaton has 28 states [2021-01-06 16:56:20,775 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 16:56:20,776 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2021-01-06 16:56:20,776 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=678, Unknown=0, NotChecked=0, Total=756 [2021-01-06 16:56:20,776 INFO L87 Difference]: Start difference. First operand 101 states and 109 transitions. Second operand 28 states. [2021-01-06 16:56:22,128 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 16:56:22,128 INFO L93 Difference]: Finished difference Result 130 states and 146 transitions. [2021-01-06 16:56:22,131 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2021-01-06 16:56:22,132 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 99 [2021-01-06 16:56:22,132 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 16:56:22,133 INFO L225 Difference]: With dead ends: 130 [2021-01-06 16:56:22,133 INFO L226 Difference]: Without dead ends: 105 [2021-01-06 16:56:22,134 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 127 GetRequests, 99 SyntacticMatches, 2 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=78, Invalid=678, Unknown=0, NotChecked=0, Total=756 [2021-01-06 16:56:22,134 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 105 states. [2021-01-06 16:56:22,139 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 105 to 104. [2021-01-06 16:56:22,139 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 104 states. [2021-01-06 16:56:22,140 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 104 states to 104 states and 112 transitions. [2021-01-06 16:56:22,140 INFO L78 Accepts]: Start accepts. Automaton has 104 states and 112 transitions. Word has length 99 [2021-01-06 16:56:22,140 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 16:56:22,140 INFO L481 AbstractCegarLoop]: Abstraction has 104 states and 112 transitions. [2021-01-06 16:56:22,140 INFO L482 AbstractCegarLoop]: Interpolant automaton has 28 states. [2021-01-06 16:56:22,140 INFO L276 IsEmpty]: Start isEmpty. Operand 104 states and 112 transitions. [2021-01-06 16:56:22,141 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 103 [2021-01-06 16:56:22,141 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 16:56:22,142 INFO L422 BasicCegarLoop]: trace histogram [32, 32, 25, 7, 1, 1, 1, 1, 1, 1] [2021-01-06 16:56:22,356 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21,20 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-01-06 16:56:22,357 INFO L429 AbstractCegarLoop]: === Iteration 23 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 16:56:22,357 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 16:56:22,358 INFO L82 PathProgramCache]: Analyzing trace with hash -446413356, now seen corresponding path program 20 times [2021-01-06 16:56:22,358 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 16:56:22,358 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [433989035] [2021-01-06 16:56:22,359 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 16:56:22,388 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 16:56:23,113 INFO L134 CoverageAnalysis]: Checked inductivity of 1520 backedges. 513 proven. 950 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2021-01-06 16:56:23,114 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [433989035] [2021-01-06 16:56:23,114 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [495214752] [2021-01-06 16:56:23,114 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate-bitabs/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 [2021-01-06 16:56:23,175 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-01-06 16:56:23,175 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-01-06 16:56:23,177 INFO L263 TraceCheckSpWp]: Trace formula consists of 187 conjuncts, 53 conjunts are in the unsatisfiable core [2021-01-06 16:56:23,178 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-01-06 16:56:23,360 INFO L134 CoverageAnalysis]: Checked inductivity of 1520 backedges. 513 proven. 950 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2021-01-06 16:56:23,360 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-01-06 16:56:23,360 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 28] total 29 [2021-01-06 16:56:23,361 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2025982906] [2021-01-06 16:56:23,361 INFO L461 AbstractCegarLoop]: Interpolant automaton has 29 states [2021-01-06 16:56:23,361 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 16:56:23,362 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2021-01-06 16:56:23,362 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=81, Invalid=731, Unknown=0, NotChecked=0, Total=812 [2021-01-06 16:56:23,362 INFO L87 Difference]: Start difference. First operand 104 states and 112 transitions. Second operand 29 states. [2021-01-06 16:56:24,773 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 16:56:24,774 INFO L93 Difference]: Finished difference Result 133 states and 149 transitions. [2021-01-06 16:56:24,774 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2021-01-06 16:56:24,774 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 102 [2021-01-06 16:56:24,775 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 16:56:24,776 INFO L225 Difference]: With dead ends: 133 [2021-01-06 16:56:24,776 INFO L226 Difference]: Without dead ends: 108 [2021-01-06 16:56:24,777 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 131 GetRequests, 102 SyntacticMatches, 2 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=81, Invalid=731, Unknown=0, NotChecked=0, Total=812 [2021-01-06 16:56:24,777 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 108 states. [2021-01-06 16:56:24,786 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 108 to 107. [2021-01-06 16:56:24,787 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 107 states. [2021-01-06 16:56:24,787 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 107 states to 107 states and 115 transitions. [2021-01-06 16:56:24,787 INFO L78 Accepts]: Start accepts. Automaton has 107 states and 115 transitions. Word has length 102 [2021-01-06 16:56:24,788 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 16:56:24,788 INFO L481 AbstractCegarLoop]: Abstraction has 107 states and 115 transitions. [2021-01-06 16:56:24,788 INFO L482 AbstractCegarLoop]: Interpolant automaton has 29 states. [2021-01-06 16:56:24,788 INFO L276 IsEmpty]: Start isEmpty. Operand 107 states and 115 transitions. [2021-01-06 16:56:24,789 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 106 [2021-01-06 16:56:24,789 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 16:56:24,789 INFO L422 BasicCegarLoop]: trace histogram [33, 33, 26, 7, 1, 1, 1, 1, 1, 1] [2021-01-06 16:56:24,989 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable22 [2021-01-06 16:56:24,990 INFO L429 AbstractCegarLoop]: === Iteration 24 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 16:56:24,991 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 16:56:24,991 INFO L82 PathProgramCache]: Analyzing trace with hash 1580683067, now seen corresponding path program 21 times [2021-01-06 16:56:24,992 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 16:56:24,992 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1434882964] [2021-01-06 16:56:24,992 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 16:56:25,019 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 16:56:25,785 INFO L134 CoverageAnalysis]: Checked inductivity of 1617 backedges. 533 proven. 1027 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2021-01-06 16:56:25,786 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1434882964] [2021-01-06 16:56:25,786 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [12596213] [2021-01-06 16:56:25,786 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate-bitabs/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 [2021-01-06 16:56:25,926 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 11 check-sat command(s) [2021-01-06 16:56:25,926 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-01-06 16:56:25,928 INFO L263 TraceCheckSpWp]: Trace formula consists of 99 conjuncts, 26 conjunts are in the unsatisfiable core [2021-01-06 16:56:25,930 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-01-06 16:56:26,458 INFO L134 CoverageAnalysis]: Checked inductivity of 1617 backedges. 0 proven. 590 refuted. 0 times theorem prover too weak. 1027 trivial. 0 not checked. [2021-01-06 16:56:26,458 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-01-06 16:56:26,458 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 11] total 38 [2021-01-06 16:56:26,458 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [877727246] [2021-01-06 16:56:26,459 INFO L461 AbstractCegarLoop]: Interpolant automaton has 38 states [2021-01-06 16:56:26,459 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 16:56:26,459 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2021-01-06 16:56:26,460 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=99, Invalid=1307, Unknown=0, NotChecked=0, Total=1406 [2021-01-06 16:56:26,460 INFO L87 Difference]: Start difference. First operand 107 states and 115 transitions. Second operand 38 states. [2021-01-06 16:56:29,853 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 16:56:29,853 INFO L93 Difference]: Finished difference Result 141 states and 159 transitions. [2021-01-06 16:56:29,854 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2021-01-06 16:56:29,854 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 105 [2021-01-06 16:56:29,854 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 16:56:29,855 INFO L225 Difference]: With dead ends: 141 [2021-01-06 16:56:29,855 INFO L226 Difference]: Without dead ends: 114 [2021-01-06 16:56:29,857 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 163 GetRequests, 98 SyntacticMatches, 1 SemanticMatches, 64 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 387 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=263, Invalid=4027, Unknown=0, NotChecked=0, Total=4290 [2021-01-06 16:56:29,857 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 114 states. [2021-01-06 16:56:29,861 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 114 to 113. [2021-01-06 16:56:29,862 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 113 states. [2021-01-06 16:56:29,862 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 113 states to 113 states and 122 transitions. [2021-01-06 16:56:29,862 INFO L78 Accepts]: Start accepts. Automaton has 113 states and 122 transitions. Word has length 105 [2021-01-06 16:56:29,863 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 16:56:29,863 INFO L481 AbstractCegarLoop]: Abstraction has 113 states and 122 transitions. [2021-01-06 16:56:29,863 INFO L482 AbstractCegarLoop]: Interpolant automaton has 38 states. [2021-01-06 16:56:29,863 INFO L276 IsEmpty]: Start isEmpty. Operand 113 states and 122 transitions. [2021-01-06 16:56:29,864 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 112 [2021-01-06 16:56:29,864 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 16:56:29,864 INFO L422 BasicCegarLoop]: trace histogram [35, 35, 27, 8, 1, 1, 1, 1, 1, 1] [2021-01-06 16:56:30,068 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable23 [2021-01-06 16:56:30,068 INFO L429 AbstractCegarLoop]: === Iteration 25 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 16:56:30,069 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 16:56:30,069 INFO L82 PathProgramCache]: Analyzing trace with hash 292714265, now seen corresponding path program 22 times [2021-01-06 16:56:30,070 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 16:56:30,070 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1168950292] [2021-01-06 16:56:30,070 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 16:56:30,101 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 16:56:30,918 INFO L134 CoverageAnalysis]: Checked inductivity of 1820 backedges. 636 proven. 1107 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2021-01-06 16:56:30,918 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1168950292] [2021-01-06 16:56:30,919 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [551647146] [2021-01-06 16:56:30,919 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate-bitabs/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 [2021-01-06 16:56:30,996 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-01-06 16:56:30,996 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-01-06 16:56:30,998 INFO L263 TraceCheckSpWp]: Trace formula consists of 201 conjuncts, 57 conjunts are in the unsatisfiable core [2021-01-06 16:56:30,999 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-01-06 16:56:31,188 INFO L134 CoverageAnalysis]: Checked inductivity of 1820 backedges. 636 proven. 1107 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2021-01-06 16:56:31,189 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-01-06 16:56:31,189 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 30] total 31 [2021-01-06 16:56:31,189 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1817201207] [2021-01-06 16:56:31,189 INFO L461 AbstractCegarLoop]: Interpolant automaton has 31 states [2021-01-06 16:56:31,190 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 16:56:31,190 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2021-01-06 16:56:31,191 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=87, Invalid=843, Unknown=0, NotChecked=0, Total=930 [2021-01-06 16:56:31,191 INFO L87 Difference]: Start difference. First operand 113 states and 122 transitions. Second operand 31 states. [2021-01-06 16:56:32,821 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 16:56:32,822 INFO L93 Difference]: Finished difference Result 145 states and 163 transitions. [2021-01-06 16:56:32,822 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2021-01-06 16:56:32,822 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 111 [2021-01-06 16:56:32,823 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 16:56:32,823 INFO L225 Difference]: With dead ends: 145 [2021-01-06 16:56:32,824 INFO L226 Difference]: Without dead ends: 117 [2021-01-06 16:56:32,824 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 142 GetRequests, 111 SyntacticMatches, 2 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=87, Invalid=843, Unknown=0, NotChecked=0, Total=930 [2021-01-06 16:56:32,825 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 117 states. [2021-01-06 16:56:32,830 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 117 to 116. [2021-01-06 16:56:32,830 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 116 states. [2021-01-06 16:56:32,830 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 116 states to 116 states and 125 transitions. [2021-01-06 16:56:32,830 INFO L78 Accepts]: Start accepts. Automaton has 116 states and 125 transitions. Word has length 111 [2021-01-06 16:56:32,831 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 16:56:32,831 INFO L481 AbstractCegarLoop]: Abstraction has 116 states and 125 transitions. [2021-01-06 16:56:32,831 INFO L482 AbstractCegarLoop]: Interpolant automaton has 31 states. [2021-01-06 16:56:32,831 INFO L276 IsEmpty]: Start isEmpty. Operand 116 states and 125 transitions. [2021-01-06 16:56:32,832 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 115 [2021-01-06 16:56:32,832 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 16:56:32,832 INFO L422 BasicCegarLoop]: trace histogram [36, 36, 28, 8, 1, 1, 1, 1, 1, 1] [2021-01-06 16:56:33,035 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24,23 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-01-06 16:56:33,036 INFO L429 AbstractCegarLoop]: === Iteration 26 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 16:56:33,036 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 16:56:33,037 INFO L82 PathProgramCache]: Analyzing trace with hash -1266282094, now seen corresponding path program 23 times [2021-01-06 16:56:33,037 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 16:56:33,037 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1768296674] [2021-01-06 16:56:33,038 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 16:56:33,085 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 16:56:33,967 INFO L134 CoverageAnalysis]: Checked inductivity of 1926 backedges. 659 proven. 1190 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2021-01-06 16:56:33,967 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1768296674] [2021-01-06 16:56:33,967 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1384940185] [2021-01-06 16:56:33,968 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate-bitabs/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 [2021-01-06 16:57:43,407 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 37 check-sat command(s) [2021-01-06 16:57:43,408 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-01-06 16:57:43,416 INFO L263 TraceCheckSpWp]: Trace formula consists of 205 conjuncts, 61 conjunts are in the unsatisfiable core [2021-01-06 16:57:43,417 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-01-06 16:57:43,677 INFO L134 CoverageAnalysis]: Checked inductivity of 1926 backedges. 593 proven. 1276 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2021-01-06 16:57:43,677 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-01-06 16:57:43,677 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 32] total 33 [2021-01-06 16:57:43,677 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [323038070] [2021-01-06 16:57:43,677 INFO L461 AbstractCegarLoop]: Interpolant automaton has 33 states [2021-01-06 16:57:43,677 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 16:57:43,678 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2021-01-06 16:57:43,678 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=92, Invalid=964, Unknown=0, NotChecked=0, Total=1056 [2021-01-06 16:57:43,678 INFO L87 Difference]: Start difference. First operand 116 states and 125 transitions. Second operand 33 states. [2021-01-06 16:57:45,634 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 16:57:45,634 INFO L93 Difference]: Finished difference Result 151 states and 170 transitions. [2021-01-06 16:57:45,635 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2021-01-06 16:57:45,635 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 114 [2021-01-06 16:57:45,635 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 16:57:45,636 INFO L225 Difference]: With dead ends: 151 [2021-01-06 16:57:45,636 INFO L226 Difference]: Without dead ends: 123 [2021-01-06 16:57:45,637 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 146 GetRequests, 113 SyntacticMatches, 2 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=92, Invalid=964, Unknown=0, NotChecked=0, Total=1056 [2021-01-06 16:57:45,637 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 123 states. [2021-01-06 16:57:45,642 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 123 to 122. [2021-01-06 16:57:45,642 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 122 states. [2021-01-06 16:57:45,642 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 122 states to 122 states and 131 transitions. [2021-01-06 16:57:45,643 INFO L78 Accepts]: Start accepts. Automaton has 122 states and 131 transitions. Word has length 114 [2021-01-06 16:57:45,643 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 16:57:45,643 INFO L481 AbstractCegarLoop]: Abstraction has 122 states and 131 transitions. [2021-01-06 16:57:45,643 INFO L482 AbstractCegarLoop]: Interpolant automaton has 33 states. [2021-01-06 16:57:45,643 INFO L276 IsEmpty]: Start isEmpty. Operand 122 states and 131 transitions. [2021-01-06 16:57:45,644 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 121 [2021-01-06 16:57:45,644 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 16:57:45,644 INFO L422 BasicCegarLoop]: trace histogram [38, 38, 30, 8, 1, 1, 1, 1, 1, 1] [2021-01-06 16:57:45,845 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable25 [2021-01-06 16:57:45,845 INFO L429 AbstractCegarLoop]: === Iteration 27 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 16:57:45,846 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 16:57:45,846 INFO L82 PathProgramCache]: Analyzing trace with hash 1679119410, now seen corresponding path program 24 times [2021-01-06 16:57:45,846 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 16:57:45,846 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1855095744] [2021-01-06 16:57:45,847 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 16:57:45,880 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 16:57:46,909 INFO L134 CoverageAnalysis]: Checked inductivity of 2147 backedges. 705 proven. 1365 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2021-01-06 16:57:46,909 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1855095744] [2021-01-06 16:57:46,909 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1803610514] [2021-01-06 16:57:46,909 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate-bitabs/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 [2021-01-06 16:57:47,764 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 25 check-sat command(s) [2021-01-06 16:57:47,764 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-01-06 16:57:47,767 INFO L263 TraceCheckSpWp]: Trace formula consists of 157 conjuncts, 26 conjunts are in the unsatisfiable core [2021-01-06 16:57:47,770 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-01-06 16:57:48,433 INFO L134 CoverageAnalysis]: Checked inductivity of 2147 backedges. 0 proven. 782 refuted. 0 times theorem prover too weak. 1365 trivial. 0 not checked. [2021-01-06 16:57:48,433 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-01-06 16:57:48,433 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 12] total 43 [2021-01-06 16:57:48,433 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [398441314] [2021-01-06 16:57:48,434 INFO L461 AbstractCegarLoop]: Interpolant automaton has 43 states [2021-01-06 16:57:48,434 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 16:57:48,434 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2021-01-06 16:57:48,435 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=113, Invalid=1693, Unknown=0, NotChecked=0, Total=1806 [2021-01-06 16:57:48,435 INFO L87 Difference]: Start difference. First operand 122 states and 131 transitions. Second operand 43 states. [2021-01-06 16:57:52,972 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 16:57:52,972 INFO L93 Difference]: Finished difference Result 159 states and 179 transitions. [2021-01-06 16:57:52,973 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2021-01-06 16:57:52,973 INFO L78 Accepts]: Start accepts. Automaton has 43 states. Word has length 120 [2021-01-06 16:57:52,973 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 16:57:52,974 INFO L225 Difference]: With dead ends: 159 [2021-01-06 16:57:52,974 INFO L226 Difference]: Without dead ends: 129 [2021-01-06 16:57:52,976 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 186 GetRequests, 112 SyntacticMatches, 1 SemanticMatches, 73 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 506 ImplicationChecksByTransitivity, 2.7s TimeCoverageRelationStatistics Valid=301, Invalid=5249, Unknown=0, NotChecked=0, Total=5550 [2021-01-06 16:57:52,977 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 129 states. [2021-01-06 16:57:52,980 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 129 to 128. [2021-01-06 16:57:52,980 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 128 states. [2021-01-06 16:57:52,981 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 128 states to 128 states and 138 transitions. [2021-01-06 16:57:52,981 INFO L78 Accepts]: Start accepts. Automaton has 128 states and 138 transitions. Word has length 120 [2021-01-06 16:57:52,981 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 16:57:52,981 INFO L481 AbstractCegarLoop]: Abstraction has 128 states and 138 transitions. [2021-01-06 16:57:52,981 INFO L482 AbstractCegarLoop]: Interpolant automaton has 43 states. [2021-01-06 16:57:52,981 INFO L276 IsEmpty]: Start isEmpty. Operand 128 states and 138 transitions. [2021-01-06 16:57:52,982 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 127 [2021-01-06 16:57:52,982 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 16:57:52,982 INFO L422 BasicCegarLoop]: trace histogram [40, 40, 31, 9, 1, 1, 1, 1, 1, 1] [2021-01-06 16:57:53,186 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable26,25 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-01-06 16:57:53,186 INFO L429 AbstractCegarLoop]: === Iteration 28 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 16:57:53,187 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 16:57:53,187 INFO L82 PathProgramCache]: Analyzing trace with hash 1446430612, now seen corresponding path program 25 times [2021-01-06 16:57:53,188 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 16:57:53,188 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [673964896] [2021-01-06 16:57:53,188 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 16:57:53,224 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 16:57:54,231 INFO L134 CoverageAnalysis]: Checked inductivity of 2380 backedges. 823 proven. 1457 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2021-01-06 16:57:54,232 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [673964896] [2021-01-06 16:57:54,232 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [875214412] [2021-01-06 16:57:54,232 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate-bitabs/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 [2021-01-06 16:57:54,311 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 16:57:54,314 INFO L263 TraceCheckSpWp]: Trace formula consists of 223 conjuncts, 65 conjunts are in the unsatisfiable core [2021-01-06 16:57:54,316 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-01-06 16:57:54,516 INFO L134 CoverageAnalysis]: Checked inductivity of 2380 backedges. 823 proven. 1457 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2021-01-06 16:57:54,516 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-01-06 16:57:54,516 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 34] total 35 [2021-01-06 16:57:54,516 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [804718428] [2021-01-06 16:57:54,516 INFO L461 AbstractCegarLoop]: Interpolant automaton has 35 states [2021-01-06 16:57:54,517 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 16:57:54,517 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2021-01-06 16:57:54,517 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=99, Invalid=1091, Unknown=0, NotChecked=0, Total=1190 [2021-01-06 16:57:54,517 INFO L87 Difference]: Start difference. First operand 128 states and 138 transitions. Second operand 35 states. [2021-01-06 16:57:56,773 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 16:57:56,773 INFO L93 Difference]: Finished difference Result 163 states and 183 transitions. [2021-01-06 16:57:56,774 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2021-01-06 16:57:56,774 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 126 [2021-01-06 16:57:56,774 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 16:57:56,775 INFO L225 Difference]: With dead ends: 163 [2021-01-06 16:57:56,775 INFO L226 Difference]: Without dead ends: 132 [2021-01-06 16:57:56,776 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 161 GetRequests, 126 SyntacticMatches, 2 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=99, Invalid=1091, Unknown=0, NotChecked=0, Total=1190 [2021-01-06 16:57:56,777 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 132 states. [2021-01-06 16:57:56,781 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 132 to 131. [2021-01-06 16:57:56,781 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 131 states. [2021-01-06 16:57:56,782 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 131 states to 131 states and 141 transitions. [2021-01-06 16:57:56,782 INFO L78 Accepts]: Start accepts. Automaton has 131 states and 141 transitions. Word has length 126 [2021-01-06 16:57:56,782 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 16:57:56,782 INFO L481 AbstractCegarLoop]: Abstraction has 131 states and 141 transitions. [2021-01-06 16:57:56,782 INFO L482 AbstractCegarLoop]: Interpolant automaton has 35 states. [2021-01-06 16:57:56,782 INFO L276 IsEmpty]: Start isEmpty. Operand 131 states and 141 transitions. [2021-01-06 16:57:56,783 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 130 [2021-01-06 16:57:56,784 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 16:57:56,784 INFO L422 BasicCegarLoop]: trace histogram [41, 41, 32, 9, 1, 1, 1, 1, 1, 1] [2021-01-06 16:57:56,997 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable27 [2021-01-06 16:57:56,998 INFO L429 AbstractCegarLoop]: === Iteration 29 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 16:57:56,998 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 16:57:56,998 INFO L82 PathProgramCache]: Analyzing trace with hash 674089979, now seen corresponding path program 26 times [2021-01-06 16:57:56,999 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 16:57:56,999 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [8769125] [2021-01-06 16:57:56,999 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 16:57:57,036 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 16:57:58,108 INFO L134 CoverageAnalysis]: Checked inductivity of 2501 backedges. 849 proven. 1552 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2021-01-06 16:57:58,108 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [8769125] [2021-01-06 16:57:58,108 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1874687000] [2021-01-06 16:57:58,109 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate-bitabs/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 [2021-01-06 16:57:58,183 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-01-06 16:57:58,183 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-01-06 16:57:58,185 INFO L263 TraceCheckSpWp]: Trace formula consists of 227 conjuncts, 67 conjunts are in the unsatisfiable core [2021-01-06 16:57:58,186 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-01-06 16:57:58,419 INFO L134 CoverageAnalysis]: Checked inductivity of 2501 backedges. 849 proven. 1552 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2021-01-06 16:57:58,419 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-01-06 16:57:58,419 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 35] total 36 [2021-01-06 16:57:58,419 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [765513276] [2021-01-06 16:57:58,419 INFO L461 AbstractCegarLoop]: Interpolant automaton has 36 states [2021-01-06 16:57:58,419 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 16:57:58,420 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2021-01-06 16:57:58,420 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=102, Invalid=1158, Unknown=0, NotChecked=0, Total=1260 [2021-01-06 16:57:58,420 INFO L87 Difference]: Start difference. First operand 131 states and 141 transitions. Second operand 36 states. [2021-01-06 16:58:00,835 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 16:58:00,835 INFO L93 Difference]: Finished difference Result 166 states and 186 transitions. [2021-01-06 16:58:00,836 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2021-01-06 16:58:00,836 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 129 [2021-01-06 16:58:00,836 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 16:58:00,841 INFO L225 Difference]: With dead ends: 166 [2021-01-06 16:58:00,841 INFO L226 Difference]: Without dead ends: 135 [2021-01-06 16:58:00,846 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 165 GetRequests, 129 SyntacticMatches, 2 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=102, Invalid=1158, Unknown=0, NotChecked=0, Total=1260 [2021-01-06 16:58:00,847 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 135 states. [2021-01-06 16:58:00,854 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 135 to 134. [2021-01-06 16:58:00,855 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 134 states. [2021-01-06 16:58:00,856 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 134 states to 134 states and 144 transitions. [2021-01-06 16:58:00,856 INFO L78 Accepts]: Start accepts. Automaton has 134 states and 144 transitions. Word has length 129 [2021-01-06 16:58:00,856 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 16:58:00,857 INFO L481 AbstractCegarLoop]: Abstraction has 134 states and 144 transitions. [2021-01-06 16:58:00,857 INFO L482 AbstractCegarLoop]: Interpolant automaton has 36 states. [2021-01-06 16:58:00,857 INFO L276 IsEmpty]: Start isEmpty. Operand 134 states and 144 transitions. [2021-01-06 16:58:00,858 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 133 [2021-01-06 16:58:00,858 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 16:58:00,858 INFO L422 BasicCegarLoop]: trace histogram [42, 42, 33, 9, 1, 1, 1, 1, 1, 1] [2021-01-06 16:58:01,071 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable28 [2021-01-06 16:58:01,072 INFO L429 AbstractCegarLoop]: === Iteration 30 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 16:58:01,072 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 16:58:01,073 INFO L82 PathProgramCache]: Analyzing trace with hash 14096948, now seen corresponding path program 27 times [2021-01-06 16:58:01,073 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 16:58:01,073 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [88758683] [2021-01-06 16:58:01,073 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 16:58:01,112 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 16:58:02,274 INFO L134 CoverageAnalysis]: Checked inductivity of 2625 backedges. 875 proven. 1650 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2021-01-06 16:58:02,274 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [88758683] [2021-01-06 16:58:02,274 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1922418595] [2021-01-06 16:58:02,274 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate-bitabs/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 [2021-01-06 16:58:02,434 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 14 check-sat command(s) [2021-01-06 16:58:02,434 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-01-06 16:58:02,435 INFO L263 TraceCheckSpWp]: Trace formula consists of 115 conjuncts, 26 conjunts are in the unsatisfiable core [2021-01-06 16:58:02,438 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-01-06 16:58:03,222 INFO L134 CoverageAnalysis]: Checked inductivity of 2625 backedges. 0 proven. 975 refuted. 0 times theorem prover too weak. 1650 trivial. 0 not checked. [2021-01-06 16:58:03,222 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-01-06 16:58:03,222 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36, 13] total 47 [2021-01-06 16:58:03,222 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1816446624] [2021-01-06 16:58:03,223 INFO L461 AbstractCegarLoop]: Interpolant automaton has 47 states [2021-01-06 16:58:03,223 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 16:58:03,223 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2021-01-06 16:58:03,224 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=124, Invalid=2038, Unknown=0, NotChecked=0, Total=2162 [2021-01-06 16:58:03,224 INFO L87 Difference]: Start difference. First operand 134 states and 144 transitions. Second operand 47 states. [2021-01-06 16:58:07,791 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 16:58:07,791 INFO L93 Difference]: Finished difference Result 174 states and 196 transitions. [2021-01-06 16:58:07,792 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2021-01-06 16:58:07,792 INFO L78 Accepts]: Start accepts. Automaton has 47 states. Word has length 132 [2021-01-06 16:58:07,792 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 16:58:07,793 INFO L225 Difference]: With dead ends: 174 [2021-01-06 16:58:07,793 INFO L226 Difference]: Without dead ends: 141 [2021-01-06 16:58:07,796 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 204 GetRequests, 123 SyntacticMatches, 1 SemanticMatches, 80 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 606 ImplicationChecksByTransitivity, 3.1s TimeCoverageRelationStatistics Valid=330, Invalid=6312, Unknown=0, NotChecked=0, Total=6642 [2021-01-06 16:58:07,796 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 141 states. [2021-01-06 16:58:07,801 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 141 to 140. [2021-01-06 16:58:07,801 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 140 states. [2021-01-06 16:58:07,802 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 140 states to 140 states and 151 transitions. [2021-01-06 16:58:07,802 INFO L78 Accepts]: Start accepts. Automaton has 140 states and 151 transitions. Word has length 132 [2021-01-06 16:58:07,802 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 16:58:07,802 INFO L481 AbstractCegarLoop]: Abstraction has 140 states and 151 transitions. [2021-01-06 16:58:07,802 INFO L482 AbstractCegarLoop]: Interpolant automaton has 47 states. [2021-01-06 16:58:07,802 INFO L276 IsEmpty]: Start isEmpty. Operand 140 states and 151 transitions. [2021-01-06 16:58:07,804 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 139 [2021-01-06 16:58:07,804 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 16:58:07,804 INFO L422 BasicCegarLoop]: trace histogram [44, 44, 34, 10, 1, 1, 1, 1, 1, 1] [2021-01-06 16:58:08,016 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29,28 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-01-06 16:58:08,017 INFO L429 AbstractCegarLoop]: === Iteration 31 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 16:58:08,017 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 16:58:08,018 INFO L82 PathProgramCache]: Analyzing trace with hash 111639762, now seen corresponding path program 28 times [2021-01-06 16:58:08,018 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 16:58:08,018 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [129742422] [2021-01-06 16:58:08,019 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 16:58:08,057 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 16:58:09,218 INFO L134 CoverageAnalysis]: Checked inductivity of 2882 backedges. 1005 proven. 1751 refuted. 0 times theorem prover too weak. 126 trivial. 0 not checked. [2021-01-06 16:58:09,218 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [129742422] [2021-01-06 16:58:09,218 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [131496211] [2021-01-06 16:58:09,218 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate-bitabs/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 [2021-01-06 16:58:09,298 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-01-06 16:58:09,298 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-01-06 16:58:09,300 INFO L263 TraceCheckSpWp]: Trace formula consists of 241 conjuncts, 87 conjunts are in the unsatisfiable core [2021-01-06 16:58:09,304 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-01-06 16:58:10,030 INFO L134 CoverageAnalysis]: Checked inductivity of 2882 backedges. 213 proven. 2667 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-01-06 16:58:10,030 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-01-06 16:58:10,030 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37, 45] total 46 [2021-01-06 16:58:10,030 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1428083833] [2021-01-06 16:58:10,031 INFO L461 AbstractCegarLoop]: Interpolant automaton has 46 states [2021-01-06 16:58:10,031 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 16:58:10,031 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2021-01-06 16:58:10,032 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=124, Invalid=1946, Unknown=0, NotChecked=0, Total=2070 [2021-01-06 16:58:10,032 INFO L87 Difference]: Start difference. First operand 140 states and 151 transitions. Second operand 46 states. [2021-01-06 16:58:13,973 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 16:58:13,973 INFO L93 Difference]: Finished difference Result 202 states and 232 transitions. [2021-01-06 16:58:13,974 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2021-01-06 16:58:13,974 INFO L78 Accepts]: Start accepts. Automaton has 46 states. Word has length 138 [2021-01-06 16:58:13,974 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 16:58:13,975 INFO L225 Difference]: With dead ends: 202 [2021-01-06 16:58:13,975 INFO L226 Difference]: Without dead ends: 168 [2021-01-06 16:58:13,976 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 176 GetRequests, 130 SyntacticMatches, 2 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=124, Invalid=1946, Unknown=0, NotChecked=0, Total=2070 [2021-01-06 16:58:13,977 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 168 states. [2021-01-06 16:58:13,983 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 168 to 167. [2021-01-06 16:58:13,983 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 167 states. [2021-01-06 16:58:13,984 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 167 states to 167 states and 178 transitions. [2021-01-06 16:58:13,984 INFO L78 Accepts]: Start accepts. Automaton has 167 states and 178 transitions. Word has length 138 [2021-01-06 16:58:13,984 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 16:58:13,984 INFO L481 AbstractCegarLoop]: Abstraction has 167 states and 178 transitions. [2021-01-06 16:58:13,984 INFO L482 AbstractCegarLoop]: Interpolant automaton has 46 states. [2021-01-06 16:58:13,984 INFO L276 IsEmpty]: Start isEmpty. Operand 167 states and 178 transitions. [2021-01-06 16:58:13,987 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 166 [2021-01-06 16:58:13,987 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 16:58:13,987 INFO L422 BasicCegarLoop]: trace histogram [53, 53, 43, 10, 1, 1, 1, 1, 1, 1] [2021-01-06 16:58:14,188 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30,29 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-01-06 16:58:14,189 INFO L429 AbstractCegarLoop]: === Iteration 32 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 16:58:14,189 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 16:58:14,189 INFO L82 PathProgramCache]: Analyzing trace with hash -340437959, now seen corresponding path program 29 times [2021-01-06 16:58:14,190 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 16:58:14,190 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [107666860] [2021-01-06 16:58:14,190 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 16:58:14,237 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 16:58:15,803 INFO L134 CoverageAnalysis]: Checked inductivity of 4187 backedges. 1266 proven. 2795 refuted. 0 times theorem prover too weak. 126 trivial. 0 not checked. [2021-01-06 16:58:15,803 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [107666860] [2021-01-06 16:58:15,803 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [641509957] [2021-01-06 16:58:15,804 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate-bitabs/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