/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/mono-crafted_11.c -------------------------------------------------------------------------------- This is Ultimate 0.2.1-bitabs-178dd20 [2021-01-06 17:00:23,297 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-01-06 17:00:23,300 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-01-06 17:00:23,347 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-01-06 17:00:23,348 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-01-06 17:00:23,353 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-01-06 17:00:23,357 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-01-06 17:00:23,362 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-01-06 17:00:23,366 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-01-06 17:00:23,373 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-01-06 17:00:23,376 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-01-06 17:00:23,378 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-01-06 17:00:23,378 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-01-06 17:00:23,381 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-01-06 17:00:23,382 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-01-06 17:00:23,385 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-01-06 17:00:23,386 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-01-06 17:00:23,390 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-01-06 17:00:23,408 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-01-06 17:00:23,413 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-01-06 17:00:23,415 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-01-06 17:00:23,418 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-01-06 17:00:23,419 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-01-06 17:00:23,423 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-01-06 17:00:23,433 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2021-01-06 17:00:23,439 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-01-06 17:00:23,440 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-01-06 17:00:23,442 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-01-06 17:00:23,443 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-01-06 17:00:23,444 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-01-06 17:00:23,445 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-01-06 17:00:23,445 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-01-06 17:00:23,452 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-01-06 17:00:23,453 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-01-06 17:00:23,454 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-01-06 17:00:23,455 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-01-06 17:00:23,456 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 17:00:23,516 INFO L113 SettingsManager]: Loading preferences was successful [2021-01-06 17:00:23,517 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-01-06 17:00:23,520 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-01-06 17:00:23,520 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-01-06 17:00:23,521 INFO L138 SettingsManager]: * Use SBE=true [2021-01-06 17:00:23,521 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-01-06 17:00:23,521 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-01-06 17:00:23,521 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-01-06 17:00:23,522 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-01-06 17:00:23,522 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-01-06 17:00:23,522 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-01-06 17:00:23,522 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-01-06 17:00:23,522 INFO L138 SettingsManager]: * Use constant arrays=true [2021-01-06 17:00:23,523 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-01-06 17:00:23,525 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-01-06 17:00:23,526 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-01-06 17:00:23,526 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-01-06 17:00:23,526 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-01-06 17:00:23,526 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-01-06 17:00:23,527 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-01-06 17:00:23,527 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-01-06 17:00:23,527 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-01-06 17:00:23,527 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-01-06 17:00:23,527 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-01-06 17:00:23,528 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-01-06 17:00:23,528 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release [2021-01-06 17:00:23,946 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-01-06 17:00:23,978 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-01-06 17:00:23,982 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-01-06 17:00:23,984 INFO L271 PluginConnector]: Initializing CDTParser... [2021-01-06 17:00:23,984 INFO L275 PluginConnector]: CDTParser initialized [2021-01-06 17:00:23,986 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/loops-crafted-1/mono-crafted_11.c [2021-01-06 17:00:24,072 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/data/94798c982/bc7f6b9bcd79436eb7cbd89b84dfa3b5/FLAG01a7b11ff [2021-01-06 17:00:24,735 INFO L306 CDTParser]: Found 1 translation units. [2021-01-06 17:00:24,736 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-bitabs/releaseScripts/default/sv-benchmarks/c/loops-crafted-1/mono-crafted_11.c [2021-01-06 17:00:24,743 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/data/94798c982/bc7f6b9bcd79436eb7cbd89b84dfa3b5/FLAG01a7b11ff [2021-01-06 17:00:25,078 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/data/94798c982/bc7f6b9bcd79436eb7cbd89b84dfa3b5 [2021-01-06 17:00:25,082 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-01-06 17:00:25,084 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-01-06 17:00:25,086 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-01-06 17:00:25,087 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-01-06 17:00:25,091 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-01-06 17:00:25,092 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.01 05:00:25" (1/1) ... [2021-01-06 17:00:25,094 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@54445f5c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.01 05:00:25, skipping insertion in model container [2021-01-06 17:00:25,094 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.01 05:00:25" (1/1) ... [2021-01-06 17:00:25,104 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-01-06 17:00:25,119 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-01-06 17:00:25,290 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/mono-crafted_11.c[319,332] [2021-01-06 17:00:25,308 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-01-06 17:00:25,323 INFO L203 MainTranslator]: Completed pre-run [2021-01-06 17:00:25,338 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/mono-crafted_11.c[319,332] [2021-01-06 17:00:25,344 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-01-06 17:00:25,360 INFO L208 MainTranslator]: Completed translation [2021-01-06 17:00:25,360 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.01 05:00:25 WrapperNode [2021-01-06 17:00:25,361 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-01-06 17:00:25,362 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-01-06 17:00:25,362 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-01-06 17:00:25,362 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-01-06 17:00:25,372 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.01 05:00:25" (1/1) ... [2021-01-06 17:00:25,381 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.01 05:00:25" (1/1) ... [2021-01-06 17:00:25,403 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-01-06 17:00:25,404 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-01-06 17:00:25,404 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-01-06 17:00:25,405 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-01-06 17:00:25,415 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.01 05:00:25" (1/1) ... [2021-01-06 17:00:25,416 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.01 05:00:25" (1/1) ... [2021-01-06 17:00:25,417 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.01 05:00:25" (1/1) ... [2021-01-06 17:00:25,417 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.01 05:00:25" (1/1) ... [2021-01-06 17:00:25,421 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.01 05:00:25" (1/1) ... [2021-01-06 17:00:25,425 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.01 05:00:25" (1/1) ... [2021-01-06 17:00:25,427 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.01 05:00:25" (1/1) ... [2021-01-06 17:00:25,428 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-01-06 17:00:25,430 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-01-06 17:00:25,430 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-01-06 17:00:25,430 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-01-06 17:00:25,434 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.01 05:00:25" (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 17:00:25,539 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-01-06 17:00:25,539 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-01-06 17:00:25,539 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-01-06 17:00:25,539 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-01-06 17:00:25,809 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-01-06 17:00:25,809 INFO L299 CfgBuilder]: Removed 7 assume(true) statements. [2021-01-06 17:00:25,811 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.01 05:00:25 BoogieIcfgContainer [2021-01-06 17:00:25,811 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-01-06 17:00:25,813 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-01-06 17:00:25,814 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-01-06 17:00:25,818 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-01-06 17:00:25,818 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 06.01 05:00:25" (1/3) ... [2021-01-06 17:00:25,819 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2984690b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.01 05:00:25, skipping insertion in model container [2021-01-06 17:00:25,819 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.01 05:00:25" (2/3) ... [2021-01-06 17:00:25,820 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2984690b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.01 05:00:25, skipping insertion in model container [2021-01-06 17:00:25,820 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.01 05:00:25" (3/3) ... [2021-01-06 17:00:25,822 INFO L111 eAbstractionObserver]: Analyzing ICFG mono-crafted_11.c [2021-01-06 17:00:25,832 INFO L153 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-01-06 17:00:25,838 INFO L165 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-01-06 17:00:25,868 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-01-06 17:00:25,941 INFO L377 AbstractCegarLoop]: Interprodecural is true [2021-01-06 17:00:25,941 INFO L378 AbstractCegarLoop]: Hoare is true [2021-01-06 17:00:25,941 INFO L379 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-01-06 17:00:25,942 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-01-06 17:00:25,942 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-01-06 17:00:25,945 INFO L382 AbstractCegarLoop]: Difference is false [2021-01-06 17:00:25,945 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-01-06 17:00:25,946 INFO L387 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-01-06 17:00:25,997 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states. [2021-01-06 17:00:26,004 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2021-01-06 17:00:26,005 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 17:00:26,006 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2021-01-06 17:00:26,006 INFO L429 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 17:00:26,013 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 17:00:26,014 INFO L82 PathProgramCache]: Analyzing trace with hash 889937703, now seen corresponding path program 1 times [2021-01-06 17:00:26,026 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 17:00:26,027 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [6280478] [2021-01-06 17:00:26,027 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 17:00:26,149 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 17:00:26,195 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 17:00:26,196 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [6280478] [2021-01-06 17:00:26,197 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-01-06 17:00:26,197 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-01-06 17:00:26,198 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1172214986] [2021-01-06 17:00:26,204 INFO L461 AbstractCegarLoop]: Interpolant automaton has 2 states [2021-01-06 17:00:26,204 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 17:00:26,220 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2021-01-06 17:00:26,222 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-01-06 17:00:26,224 INFO L87 Difference]: Start difference. First operand 12 states. Second operand 2 states. [2021-01-06 17:00:26,242 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 17:00:26,243 INFO L93 Difference]: Finished difference Result 20 states and 23 transitions. [2021-01-06 17:00:26,243 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2021-01-06 17:00:26,244 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 6 [2021-01-06 17:00:26,245 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 17:00:26,254 INFO L225 Difference]: With dead ends: 20 [2021-01-06 17:00:26,254 INFO L226 Difference]: Without dead ends: 8 [2021-01-06 17:00:26,258 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 17:00:26,280 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8 states. [2021-01-06 17:00:26,295 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8 to 8. [2021-01-06 17:00:26,296 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 8 states. [2021-01-06 17:00:26,297 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8 states to 8 states and 9 transitions. [2021-01-06 17:00:26,299 INFO L78 Accepts]: Start accepts. Automaton has 8 states and 9 transitions. Word has length 6 [2021-01-06 17:00:26,299 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 17:00:26,300 INFO L481 AbstractCegarLoop]: Abstraction has 8 states and 9 transitions. [2021-01-06 17:00:26,300 INFO L482 AbstractCegarLoop]: Interpolant automaton has 2 states. [2021-01-06 17:00:26,300 INFO L276 IsEmpty]: Start isEmpty. Operand 8 states and 9 transitions. [2021-01-06 17:00:26,300 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2021-01-06 17:00:26,301 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 17:00:26,301 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2021-01-06 17:00:26,301 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-01-06 17:00:26,301 INFO L429 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 17:00:26,302 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 17:00:26,302 INFO L82 PathProgramCache]: Analyzing trace with hash 889639793, now seen corresponding path program 1 times [2021-01-06 17:00:26,303 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 17:00:26,303 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [770918528] [2021-01-06 17:00:26,303 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 17:00:26,338 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 17:00:26,430 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 17:00:26,431 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [770918528] [2021-01-06 17:00:26,431 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-01-06 17:00:26,431 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-01-06 17:00:26,432 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2138493902] [2021-01-06 17:00:26,436 INFO L461 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-01-06 17:00:26,439 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 17:00:26,441 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-01-06 17:00:26,441 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-01-06 17:00:26,442 INFO L87 Difference]: Start difference. First operand 8 states and 9 transitions. Second operand 3 states. [2021-01-06 17:00:26,494 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 17:00:26,494 INFO L93 Difference]: Finished difference Result 16 states and 20 transitions. [2021-01-06 17:00:26,496 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-01-06 17:00:26,496 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 6 [2021-01-06 17:00:26,496 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 17:00:26,497 INFO L225 Difference]: With dead ends: 16 [2021-01-06 17:00:26,497 INFO L226 Difference]: Without dead ends: 10 [2021-01-06 17:00:26,498 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 1 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 17:00:26,499 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 10 states. [2021-01-06 17:00:26,501 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 10 to 10. [2021-01-06 17:00:26,502 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 10 states. [2021-01-06 17:00:26,503 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 10 states to 10 states and 11 transitions. [2021-01-06 17:00:26,503 INFO L78 Accepts]: Start accepts. Automaton has 10 states and 11 transitions. Word has length 6 [2021-01-06 17:00:26,503 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 17:00:26,504 INFO L481 AbstractCegarLoop]: Abstraction has 10 states and 11 transitions. [2021-01-06 17:00:26,504 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2021-01-06 17:00:26,504 INFO L276 IsEmpty]: Start isEmpty. Operand 10 states and 11 transitions. [2021-01-06 17:00:26,504 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2021-01-06 17:00:26,505 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 17:00:26,505 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2021-01-06 17:00:26,505 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-01-06 17:00:26,505 INFO L429 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 17:00:26,506 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 17:00:26,506 INFO L82 PathProgramCache]: Analyzing trace with hash 295691924, now seen corresponding path program 1 times [2021-01-06 17:00:26,507 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 17:00:26,507 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1095093463] [2021-01-06 17:00:26,507 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 17:00:26,529 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 17:00:26,682 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-01-06 17:00:26,682 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1095093463] [2021-01-06 17:00:26,683 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1712015358] [2021-01-06 17:00:26,683 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 17:00:26,832 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 17:00:26,836 INFO L263 TraceCheckSpWp]: Trace formula consists of 45 conjuncts, 5 conjunts are in the unsatisfiable core [2021-01-06 17:00:26,843 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-01-06 17:00:26,900 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-01-06 17:00:26,900 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-01-06 17:00:26,901 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 5 [2021-01-06 17:00:26,903 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [958531888] [2021-01-06 17:00:26,903 INFO L461 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-01-06 17:00:26,904 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 17:00:26,907 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-01-06 17:00:26,908 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-01-06 17:00:26,908 INFO L87 Difference]: Start difference. First operand 10 states and 11 transitions. Second operand 5 states. [2021-01-06 17:00:26,967 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 17:00:26,967 INFO L93 Difference]: Finished difference Result 18 states and 22 transitions. [2021-01-06 17:00:26,968 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-01-06 17:00:26,968 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 8 [2021-01-06 17:00:26,969 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 17:00:26,969 INFO L225 Difference]: With dead ends: 18 [2021-01-06 17:00:26,969 INFO L226 Difference]: Without dead ends: 12 [2021-01-06 17:00:26,970 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-01-06 17:00:26,971 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12 states. [2021-01-06 17:00:26,973 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12 to 12. [2021-01-06 17:00:26,973 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 12 states. [2021-01-06 17:00:26,974 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 13 transitions. [2021-01-06 17:00:26,974 INFO L78 Accepts]: Start accepts. Automaton has 12 states and 13 transitions. Word has length 8 [2021-01-06 17:00:26,974 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 17:00:26,975 INFO L481 AbstractCegarLoop]: Abstraction has 12 states and 13 transitions. [2021-01-06 17:00:26,975 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2021-01-06 17:00:26,975 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states and 13 transitions. [2021-01-06 17:00:26,975 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2021-01-06 17:00:26,975 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 17:00:26,976 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1] [2021-01-06 17:00:27,189 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2 [2021-01-06 17:00:27,190 INFO L429 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 17:00:27,191 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 17:00:27,191 INFO L82 PathProgramCache]: Analyzing trace with hash 742440183, now seen corresponding path program 2 times [2021-01-06 17:00:27,192 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 17:00:27,193 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1660550623] [2021-01-06 17:00:27,193 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 17:00:27,214 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 17:00:27,306 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-01-06 17:00:27,307 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1660550623] [2021-01-06 17:00:27,307 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [469689078] [2021-01-06 17:00:27,307 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 17:00:27,370 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-01-06 17:00:27,371 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-01-06 17:00:27,372 INFO L263 TraceCheckSpWp]: Trace formula consists of 49 conjuncts, 7 conjunts are in the unsatisfiable core [2021-01-06 17:00:27,373 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-01-06 17:00:27,463 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-01-06 17:00:27,464 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-01-06 17:00:27,464 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 6 [2021-01-06 17:00:27,464 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [684022246] [2021-01-06 17:00:27,465 INFO L461 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-01-06 17:00:27,465 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 17:00:27,466 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-01-06 17:00:27,466 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-01-06 17:00:27,467 INFO L87 Difference]: Start difference. First operand 12 states and 13 transitions. Second operand 6 states. [2021-01-06 17:00:27,559 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 17:00:27,559 INFO L93 Difference]: Finished difference Result 20 states and 24 transitions. [2021-01-06 17:00:27,563 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-01-06 17:00:27,564 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 10 [2021-01-06 17:00:27,564 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 17:00:27,565 INFO L225 Difference]: With dead ends: 20 [2021-01-06 17:00:27,565 INFO L226 Difference]: Without dead ends: 14 [2021-01-06 17:00:27,566 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 10 SyntacticMatches, 1 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 17:00:27,568 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2021-01-06 17:00:27,574 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2021-01-06 17:00:27,574 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2021-01-06 17:00:27,575 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 15 transitions. [2021-01-06 17:00:27,575 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 15 transitions. Word has length 10 [2021-01-06 17:00:27,575 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 17:00:27,576 INFO L481 AbstractCegarLoop]: Abstraction has 14 states and 15 transitions. [2021-01-06 17:00:27,576 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2021-01-06 17:00:27,579 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 15 transitions. [2021-01-06 17:00:27,580 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-01-06 17:00:27,580 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 17:00:27,580 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 1, 1, 1, 1, 1, 1] [2021-01-06 17:00:27,797 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-01-06 17:00:27,798 INFO L429 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 17:00:27,800 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 17:00:27,800 INFO L82 PathProgramCache]: Analyzing trace with hash 570787482, now seen corresponding path program 3 times [2021-01-06 17:00:27,800 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 17:00:27,801 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1588779147] [2021-01-06 17:00:27,801 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 17:00:27,827 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 17:00:27,994 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-01-06 17:00:27,994 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1588779147] [2021-01-06 17:00:27,995 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [920589671] [2021-01-06 17:00:27,995 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 17:00:28,057 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-01-06 17:00:28,058 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-01-06 17:00:28,059 INFO L263 TraceCheckSpWp]: Trace formula consists of 45 conjuncts, 4 conjunts are in the unsatisfiable core [2021-01-06 17:00:28,060 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-01-06 17:00:28,125 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-01-06 17:00:28,126 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 1 imperfect interpolant sequences. [2021-01-06 17:00:28,126 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [6] total 7 [2021-01-06 17:00:28,127 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1150790936] [2021-01-06 17:00:28,127 INFO L461 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-01-06 17:00:28,127 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 17:00:28,128 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-01-06 17:00:28,129 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=26, Unknown=0, NotChecked=0, Total=42 [2021-01-06 17:00:28,129 INFO L87 Difference]: Start difference. First operand 14 states and 15 transitions. Second operand 3 states. [2021-01-06 17:00:28,153 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 17:00:28,153 INFO L93 Difference]: Finished difference Result 20 states and 22 transitions. [2021-01-06 17:00:28,154 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-01-06 17:00:28,155 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 12 [2021-01-06 17:00:28,155 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 17:00:28,156 INFO L225 Difference]: With dead ends: 20 [2021-01-06 17:00:28,156 INFO L226 Difference]: Without dead ends: 16 [2021-01-06 17:00:28,157 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 13 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=16, Invalid=26, Unknown=0, NotChecked=0, Total=42 [2021-01-06 17:00:28,157 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2021-01-06 17:00:28,160 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 15. [2021-01-06 17:00:28,160 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2021-01-06 17:00:28,161 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 16 transitions. [2021-01-06 17:00:28,161 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 16 transitions. Word has length 12 [2021-01-06 17:00:28,162 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 17:00:28,162 INFO L481 AbstractCegarLoop]: Abstraction has 15 states and 16 transitions. [2021-01-06 17:00:28,162 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2021-01-06 17:00:28,162 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 16 transitions. [2021-01-06 17:00:28,163 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2021-01-06 17:00:28,163 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 17:00:28,163 INFO L422 BasicCegarLoop]: trace histogram [4, 3, 1, 1, 1, 1, 1, 1, 1] [2021-01-06 17:00:28,371 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-01-06 17:00:28,372 INFO L429 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 17:00:28,373 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 17:00:28,374 INFO L82 PathProgramCache]: Analyzing trace with hash -1176853889, now seen corresponding path program 1 times [2021-01-06 17:00:28,374 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 17:00:28,375 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1645907783] [2021-01-06 17:00:28,375 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 17:00:28,396 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 17:00:28,550 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 4 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-01-06 17:00:28,551 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1645907783] [2021-01-06 17:00:28,551 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1583794179] [2021-01-06 17:00:28,551 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 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 17:00:28,616 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 17:00:28,618 INFO L263 TraceCheckSpWp]: Trace formula consists of 57 conjuncts, 10 conjunts are in the unsatisfiable core [2021-01-06 17:00:28,619 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-01-06 17:00:28,706 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 4 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-01-06 17:00:28,707 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-01-06 17:00:28,707 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 7 [2021-01-06 17:00:28,708 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [294677647] [2021-01-06 17:00:28,708 INFO L461 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-01-06 17:00:28,708 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 17:00:28,709 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-01-06 17:00:28,709 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2021-01-06 17:00:28,709 INFO L87 Difference]: Start difference. First operand 15 states and 16 transitions. Second operand 7 states. [2021-01-06 17:00:28,800 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 17:00:28,800 INFO L93 Difference]: Finished difference Result 24 states and 27 transitions. [2021-01-06 17:00:28,801 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-01-06 17:00:28,801 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 14 [2021-01-06 17:00:28,801 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 17:00:28,802 INFO L225 Difference]: With dead ends: 24 [2021-01-06 17:00:28,802 INFO L226 Difference]: Without dead ends: 17 [2021-01-06 17:00:28,803 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 12 SyntacticMatches, 3 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2021-01-06 17:00:28,803 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2021-01-06 17:00:28,806 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2021-01-06 17:00:28,806 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2021-01-06 17:00:28,807 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 18 transitions. [2021-01-06 17:00:28,807 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 18 transitions. Word has length 14 [2021-01-06 17:00:28,807 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 17:00:28,807 INFO L481 AbstractCegarLoop]: Abstraction has 17 states and 18 transitions. [2021-01-06 17:00:28,807 INFO L482 AbstractCegarLoop]: Interpolant automaton has 7 states. [2021-01-06 17:00:28,808 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 18 transitions. [2021-01-06 17:00:28,808 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2021-01-06 17:00:28,808 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 17:00:28,808 INFO L422 BasicCegarLoop]: trace histogram [5, 4, 1, 1, 1, 1, 1, 1, 1] [2021-01-06 17:00:29,021 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-01-06 17:00:29,022 INFO L429 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 17:00:29,023 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 17:00:29,024 INFO L82 PathProgramCache]: Analyzing trace with hash 1191961250, now seen corresponding path program 2 times [2021-01-06 17:00:29,024 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 17:00:29,025 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1182617256] [2021-01-06 17:00:29,025 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 17:00:29,046 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 17:00:29,205 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 5 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-01-06 17:00:29,205 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1182617256] [2021-01-06 17:00:29,206 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [385506508] [2021-01-06 17:00:29,206 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 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 17:00:29,277 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-01-06 17:00:29,277 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-01-06 17:00:29,279 INFO L263 TraceCheckSpWp]: Trace formula consists of 61 conjuncts, 13 conjunts are in the unsatisfiable core [2021-01-06 17:00:29,280 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-01-06 17:00:29,401 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-01-06 17:00:29,402 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-01-06 17:00:29,403 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 8] total 9 [2021-01-06 17:00:29,405 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2077154848] [2021-01-06 17:00:29,406 INFO L461 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-01-06 17:00:29,408 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 17:00:29,411 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-01-06 17:00:29,411 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=52, Unknown=0, NotChecked=0, Total=72 [2021-01-06 17:00:29,411 INFO L87 Difference]: Start difference. First operand 17 states and 18 transitions. Second operand 9 states. [2021-01-06 17:00:29,541 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 17:00:29,541 INFO L93 Difference]: Finished difference Result 26 states and 29 transitions. [2021-01-06 17:00:29,542 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-01-06 17:00:29,542 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 16 [2021-01-06 17:00:29,542 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 17:00:29,543 INFO L225 Difference]: With dead ends: 26 [2021-01-06 17:00:29,543 INFO L226 Difference]: Without dead ends: 19 [2021-01-06 17:00:29,544 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 14 SyntacticMatches, 2 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=20, Invalid=52, Unknown=0, NotChecked=0, Total=72 [2021-01-06 17:00:29,544 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2021-01-06 17:00:29,547 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2021-01-06 17:00:29,547 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2021-01-06 17:00:29,548 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 20 transitions. [2021-01-06 17:00:29,548 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 20 transitions. Word has length 16 [2021-01-06 17:00:29,548 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 17:00:29,549 INFO L481 AbstractCegarLoop]: Abstraction has 19 states and 20 transitions. [2021-01-06 17:00:29,549 INFO L482 AbstractCegarLoop]: Interpolant automaton has 9 states. [2021-01-06 17:00:29,549 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 20 transitions. [2021-01-06 17:00:29,549 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2021-01-06 17:00:29,550 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 17:00:29,550 INFO L422 BasicCegarLoop]: trace histogram [6, 5, 1, 1, 1, 1, 1, 1, 1] [2021-01-06 17:00:29,764 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2021-01-06 17:00:29,765 INFO L429 AbstractCegarLoop]: === Iteration 8 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 17:00:29,766 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 17:00:29,766 INFO L82 PathProgramCache]: Analyzing trace with hash 1290642949, now seen corresponding path program 3 times [2021-01-06 17:00:29,767 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 17:00:29,767 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1741154753] [2021-01-06 17:00:29,767 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 17:00:29,801 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 17:00:29,998 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 6 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-01-06 17:00:29,998 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1741154753] [2021-01-06 17:00:29,998 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [707533620] [2021-01-06 17:00:29,999 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 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 17:00:30,081 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-01-06 17:00:30,081 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-01-06 17:00:30,082 INFO L263 TraceCheckSpWp]: Trace formula consists of 53 conjuncts, 7 conjunts are in the unsatisfiable core [2021-01-06 17:00:30,085 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-01-06 17:00:30,234 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 15 proven. 1 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2021-01-06 17:00:30,235 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-01-06 17:00:30,235 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 4] total 10 [2021-01-06 17:00:30,236 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [333979520] [2021-01-06 17:00:30,236 INFO L461 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-01-06 17:00:30,236 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 17:00:30,238 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-01-06 17:00:30,238 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=62, Unknown=0, NotChecked=0, Total=90 [2021-01-06 17:00:30,238 INFO L87 Difference]: Start difference. First operand 19 states and 20 transitions. Second operand 10 states. [2021-01-06 17:00:30,427 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 17:00:30,427 INFO L93 Difference]: Finished difference Result 33 states and 40 transitions. [2021-01-06 17:00:30,428 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-01-06 17:00:30,428 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 18 [2021-01-06 17:00:30,429 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 17:00:30,429 INFO L225 Difference]: With dead ends: 33 [2021-01-06 17:00:30,430 INFO L226 Difference]: Without dead ends: 26 [2021-01-06 17:00:30,430 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 17 SyntacticMatches, 1 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=42, Invalid=90, Unknown=0, NotChecked=0, Total=132 [2021-01-06 17:00:30,431 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2021-01-06 17:00:30,435 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 23. [2021-01-06 17:00:30,435 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2021-01-06 17:00:30,436 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 25 transitions. [2021-01-06 17:00:30,436 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 25 transitions. Word has length 18 [2021-01-06 17:00:30,436 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 17:00:30,436 INFO L481 AbstractCegarLoop]: Abstraction has 23 states and 25 transitions. [2021-01-06 17:00:30,437 INFO L482 AbstractCegarLoop]: Interpolant automaton has 10 states. [2021-01-06 17:00:30,437 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 25 transitions. [2021-01-06 17:00:30,437 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-01-06 17:00:30,438 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 17:00:30,438 INFO L422 BasicCegarLoop]: trace histogram [8, 6, 2, 1, 1, 1, 1, 1, 1] [2021-01-06 17:00:30,652 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-01-06 17:00:30,653 INFO L429 AbstractCegarLoop]: === Iteration 9 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 17:00:30,654 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 17:00:30,654 INFO L82 PathProgramCache]: Analyzing trace with hash -1175196403, now seen corresponding path program 4 times [2021-01-06 17:00:30,655 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 17:00:30,655 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [325457865] [2021-01-06 17:00:30,656 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 17:00:30,679 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 17:00:30,847 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 21 proven. 42 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-01-06 17:00:30,848 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [325457865] [2021-01-06 17:00:30,848 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1743488891] [2021-01-06 17:00:30,848 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 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 17:00:30,892 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-01-06 17:00:30,893 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-01-06 17:00:30,894 INFO L263 TraceCheckSpWp]: Trace formula consists of 73 conjuncts, 16 conjunts are in the unsatisfiable core [2021-01-06 17:00:30,895 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-01-06 17:00:30,971 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 21 proven. 42 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-01-06 17:00:30,971 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-01-06 17:00:30,972 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 10 [2021-01-06 17:00:30,973 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1752245417] [2021-01-06 17:00:30,973 INFO L461 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-01-06 17:00:30,974 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 17:00:30,974 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-01-06 17:00:30,975 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=66, Unknown=0, NotChecked=0, Total=90 [2021-01-06 17:00:30,975 INFO L87 Difference]: Start difference. First operand 23 states and 25 transitions. Second operand 10 states. [2021-01-06 17:00:31,083 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 17:00:31,083 INFO L93 Difference]: Finished difference Result 34 states and 39 transitions. [2021-01-06 17:00:31,084 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-01-06 17:00:31,084 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 22 [2021-01-06 17:00:31,084 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 17:00:31,085 INFO L225 Difference]: With dead ends: 34 [2021-01-06 17:00:31,085 INFO L226 Difference]: Without dead ends: 25 [2021-01-06 17:00:31,086 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 20 SyntacticMatches, 3 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=24, Invalid=66, Unknown=0, NotChecked=0, Total=90 [2021-01-06 17:00:31,086 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2021-01-06 17:00:31,089 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2021-01-06 17:00:31,090 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2021-01-06 17:00:31,090 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 27 transitions. [2021-01-06 17:00:31,091 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 27 transitions. Word has length 22 [2021-01-06 17:00:31,091 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 17:00:31,091 INFO L481 AbstractCegarLoop]: Abstraction has 25 states and 27 transitions. [2021-01-06 17:00:31,091 INFO L482 AbstractCegarLoop]: Interpolant automaton has 10 states. [2021-01-06 17:00:31,091 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 27 transitions. [2021-01-06 17:00:31,092 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-01-06 17:00:31,092 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 17:00:31,092 INFO L422 BasicCegarLoop]: trace histogram [9, 7, 2, 1, 1, 1, 1, 1, 1] [2021-01-06 17:00:31,307 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-01-06 17:00:31,308 INFO L429 AbstractCegarLoop]: === Iteration 10 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 17:00:31,309 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 17:00:31,309 INFO L82 PathProgramCache]: Analyzing trace with hash -415213008, now seen corresponding path program 5 times [2021-01-06 17:00:31,309 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 17:00:31,310 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1933621859] [2021-01-06 17:00:31,310 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 17:00:31,327 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 17:00:31,469 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 24 proven. 56 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-01-06 17:00:31,470 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1933621859] [2021-01-06 17:00:31,470 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1728930956] [2021-01-06 17:00:31,470 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 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 17:00:31,636 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 10 check-sat command(s) [2021-01-06 17:00:31,636 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-01-06 17:00:31,637 INFO L263 TraceCheckSpWp]: Trace formula consists of 77 conjuncts, 20 conjunts are in the unsatisfiable core [2021-01-06 17:00:31,639 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-01-06 17:00:31,760 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 24 proven. 56 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-01-06 17:00:31,761 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-01-06 17:00:31,761 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10] total 11 [2021-01-06 17:00:31,761 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1940904242] [2021-01-06 17:00:31,762 INFO L461 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-01-06 17:00:31,762 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 17:00:31,763 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-01-06 17:00:31,763 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2021-01-06 17:00:31,763 INFO L87 Difference]: Start difference. First operand 25 states and 27 transitions. Second operand 11 states. [2021-01-06 17:00:31,888 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 17:00:31,888 INFO L93 Difference]: Finished difference Result 36 states and 41 transitions. [2021-01-06 17:00:31,889 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-01-06 17:00:31,889 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 24 [2021-01-06 17:00:31,889 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 17:00:31,890 INFO L225 Difference]: With dead ends: 36 [2021-01-06 17:00:31,890 INFO L226 Difference]: Without dead ends: 27 [2021-01-06 17:00:31,891 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 21 SyntacticMatches, 4 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2021-01-06 17:00:31,891 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2021-01-06 17:00:31,895 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2021-01-06 17:00:31,895 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2021-01-06 17:00:31,896 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 29 transitions. [2021-01-06 17:00:31,896 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 29 transitions. Word has length 24 [2021-01-06 17:00:31,896 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 17:00:31,896 INFO L481 AbstractCegarLoop]: Abstraction has 27 states and 29 transitions. [2021-01-06 17:00:31,896 INFO L482 AbstractCegarLoop]: Interpolant automaton has 11 states. [2021-01-06 17:00:31,897 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 29 transitions. [2021-01-06 17:00:31,897 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-01-06 17:00:31,897 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 17:00:31,898 INFO L422 BasicCegarLoop]: trace histogram [10, 8, 2, 1, 1, 1, 1, 1, 1] [2021-01-06 17:00:32,098 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2021-01-06 17:00:32,100 INFO L429 AbstractCegarLoop]: === Iteration 11 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 17:00:32,101 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 17:00:32,101 INFO L82 PathProgramCache]: Analyzing trace with hash -215610733, now seen corresponding path program 6 times [2021-01-06 17:00:32,102 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 17:00:32,102 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1783333261] [2021-01-06 17:00:32,102 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 17:00:32,132 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 17:00:32,305 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 27 proven. 72 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-01-06 17:00:32,306 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1783333261] [2021-01-06 17:00:32,306 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [931868130] [2021-01-06 17:00:32,307 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 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 17:00:32,448 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 11 check-sat command(s) [2021-01-06 17:00:32,448 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-01-06 17:00:32,450 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 28 conjunts are in the unsatisfiable core [2021-01-06 17:00:32,452 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-01-06 17:00:32,557 INFO L639 QuantifierPusher]: Distributing 2 conjuncts over 3 disjuncts [2021-01-06 17:00:32,585 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-01-06 17:00:32,586 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-01-06 17:00:32,586 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 14] total 15 [2021-01-06 17:00:32,586 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1882153500] [2021-01-06 17:00:32,587 INFO L461 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-01-06 17:00:32,587 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 17:00:32,587 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-01-06 17:00:32,588 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=174, Unknown=0, NotChecked=0, Total=210 [2021-01-06 17:00:32,588 INFO L87 Difference]: Start difference. First operand 27 states and 29 transitions. Second operand 15 states. [2021-01-06 17:00:32,775 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 17:00:32,775 INFO L93 Difference]: Finished difference Result 38 states and 43 transitions. [2021-01-06 17:00:32,776 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-01-06 17:00:32,776 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 26 [2021-01-06 17:00:32,776 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 17:00:32,777 INFO L225 Difference]: With dead ends: 38 [2021-01-06 17:00:32,777 INFO L226 Difference]: Without dead ends: 29 [2021-01-06 17:00:32,788 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 22 SyntacticMatches, 2 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=36, Invalid=174, Unknown=0, NotChecked=0, Total=210 [2021-01-06 17:00:32,789 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2021-01-06 17:00:32,799 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2021-01-06 17:00:32,799 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2021-01-06 17:00:32,801 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 31 transitions. [2021-01-06 17:00:32,801 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 31 transitions. Word has length 26 [2021-01-06 17:00:32,802 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 17:00:32,802 INFO L481 AbstractCegarLoop]: Abstraction has 29 states and 31 transitions. [2021-01-06 17:00:32,802 INFO L482 AbstractCegarLoop]: Interpolant automaton has 15 states. [2021-01-06 17:00:32,802 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 31 transitions. [2021-01-06 17:00:32,803 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2021-01-06 17:00:32,803 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 17:00:32,805 INFO L422 BasicCegarLoop]: trace histogram [11, 9, 2, 1, 1, 1, 1, 1, 1] [2021-01-06 17:00:33,012 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,10 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-01-06 17:00:33,013 INFO L429 AbstractCegarLoop]: === Iteration 12 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 17:00:33,013 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 17:00:33,014 INFO L82 PathProgramCache]: Analyzing trace with hash -1671352778, now seen corresponding path program 7 times [2021-01-06 17:00:33,014 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 17:00:33,014 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1119314551] [2021-01-06 17:00:33,014 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 17:00:33,030 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 17:00:33,243 INFO L134 CoverageAnalysis]: Checked inductivity of 121 backedges. 30 proven. 90 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-01-06 17:00:33,244 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1119314551] [2021-01-06 17:00:33,244 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1895661432] [2021-01-06 17:00:33,244 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 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 17:00:33,294 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 17:00:33,295 INFO L263 TraceCheckSpWp]: Trace formula consists of 85 conjuncts, 22 conjunts are in the unsatisfiable core [2021-01-06 17:00:33,296 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-01-06 17:00:33,385 INFO L134 CoverageAnalysis]: Checked inductivity of 121 backedges. 30 proven. 90 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-01-06 17:00:33,385 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-01-06 17:00:33,386 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12] total 13 [2021-01-06 17:00:33,386 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [596157634] [2021-01-06 17:00:33,386 INFO L461 AbstractCegarLoop]: Interpolant automaton has 13 states [2021-01-06 17:00:33,386 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 17:00:33,387 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-01-06 17:00:33,387 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=123, Unknown=0, NotChecked=0, Total=156 [2021-01-06 17:00:33,387 INFO L87 Difference]: Start difference. First operand 29 states and 31 transitions. Second operand 13 states. [2021-01-06 17:00:33,561 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 17:00:33,561 INFO L93 Difference]: Finished difference Result 40 states and 45 transitions. [2021-01-06 17:00:33,562 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-01-06 17:00:33,562 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 28 [2021-01-06 17:00:33,562 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 17:00:33,563 INFO L225 Difference]: With dead ends: 40 [2021-01-06 17:00:33,563 INFO L226 Difference]: Without dead ends: 31 [2021-01-06 17:00:33,563 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 26 SyntacticMatches, 3 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=33, Invalid=123, Unknown=0, NotChecked=0, Total=156 [2021-01-06 17:00:33,564 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2021-01-06 17:00:33,569 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 31. [2021-01-06 17:00:33,569 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2021-01-06 17:00:33,570 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 33 transitions. [2021-01-06 17:00:33,570 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 33 transitions. Word has length 28 [2021-01-06 17:00:33,570 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 17:00:33,570 INFO L481 AbstractCegarLoop]: Abstraction has 31 states and 33 transitions. [2021-01-06 17:00:33,570 INFO L482 AbstractCegarLoop]: Interpolant automaton has 13 states. [2021-01-06 17:00:33,570 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 33 transitions. [2021-01-06 17:00:33,571 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2021-01-06 17:00:33,571 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 17:00:33,571 INFO L422 BasicCegarLoop]: trace histogram [12, 10, 2, 1, 1, 1, 1, 1, 1] [2021-01-06 17:00:33,780 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,11 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-01-06 17:00:33,781 INFO L429 AbstractCegarLoop]: === Iteration 13 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 17:00:33,782 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 17:00:33,782 INFO L82 PathProgramCache]: Analyzing trace with hash -480119527, now seen corresponding path program 8 times [2021-01-06 17:00:33,783 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 17:00:33,783 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [671170962] [2021-01-06 17:00:33,783 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 17:00:33,798 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 17:00:34,049 INFO L134 CoverageAnalysis]: Checked inductivity of 144 backedges. 33 proven. 110 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-01-06 17:00:34,049 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [671170962] [2021-01-06 17:00:34,050 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [834313575] [2021-01-06 17:00:34,050 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 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 17:00:34,101 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-01-06 17:00:34,101 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-01-06 17:00:34,102 INFO L263 TraceCheckSpWp]: Trace formula consists of 89 conjuncts, 27 conjunts are in the unsatisfiable core [2021-01-06 17:00:34,105 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-01-06 17:00:34,217 INFO L134 CoverageAnalysis]: Checked inductivity of 144 backedges. 0 proven. 144 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-01-06 17:00:34,217 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-01-06 17:00:34,218 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 15] total 16 [2021-01-06 17:00:34,221 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [942937769] [2021-01-06 17:00:34,222 INFO L461 AbstractCegarLoop]: Interpolant automaton has 16 states [2021-01-06 17:00:34,222 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 17:00:34,223 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-01-06 17:00:34,223 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=40, Invalid=200, Unknown=0, NotChecked=0, Total=240 [2021-01-06 17:00:34,223 INFO L87 Difference]: Start difference. First operand 31 states and 33 transitions. Second operand 16 states. [2021-01-06 17:00:34,430 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 17:00:34,430 INFO L93 Difference]: Finished difference Result 42 states and 47 transitions. [2021-01-06 17:00:34,430 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-01-06 17:00:34,431 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 30 [2021-01-06 17:00:34,431 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 17:00:34,436 INFO L225 Difference]: With dead ends: 42 [2021-01-06 17:00:34,437 INFO L226 Difference]: Without dead ends: 33 [2021-01-06 17:00:34,438 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 27 SyntacticMatches, 2 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=40, Invalid=200, Unknown=0, NotChecked=0, Total=240 [2021-01-06 17:00:34,440 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2021-01-06 17:00:34,454 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2021-01-06 17:00:34,455 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2021-01-06 17:00:34,455 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 35 transitions. [2021-01-06 17:00:34,455 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 35 transitions. Word has length 30 [2021-01-06 17:00:34,455 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 17:00:34,456 INFO L481 AbstractCegarLoop]: Abstraction has 33 states and 35 transitions. [2021-01-06 17:00:34,456 INFO L482 AbstractCegarLoop]: Interpolant automaton has 16 states. [2021-01-06 17:00:34,456 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 35 transitions. [2021-01-06 17:00:34,458 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2021-01-06 17:00:34,458 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 17:00:34,459 INFO L422 BasicCegarLoop]: trace histogram [13, 11, 2, 1, 1, 1, 1, 1, 1] [2021-01-06 17:00:34,659 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2021-01-06 17:00:34,660 INFO L429 AbstractCegarLoop]: === Iteration 14 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 17:00:34,660 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 17:00:34,661 INFO L82 PathProgramCache]: Analyzing trace with hash 1833733948, now seen corresponding path program 9 times [2021-01-06 17:00:34,661 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 17:00:34,661 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [344098737] [2021-01-06 17:00:34,662 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 17:00:34,688 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 17:00:34,942 INFO L134 CoverageAnalysis]: Checked inductivity of 169 backedges. 36 proven. 132 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-01-06 17:00:34,943 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [344098737] [2021-01-06 17:00:34,943 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1112312311] [2021-01-06 17:00:34,943 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 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 17:00:35,006 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2021-01-06 17:00:35,006 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-01-06 17:00:35,007 INFO L263 TraceCheckSpWp]: Trace formula consists of 61 conjuncts, 8 conjunts are in the unsatisfiable core [2021-01-06 17:00:35,009 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-01-06 17:00:35,139 INFO L134 CoverageAnalysis]: Checked inductivity of 169 backedges. 55 proven. 4 refuted. 0 times theorem prover too weak. 110 trivial. 0 not checked. [2021-01-06 17:00:35,140 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-01-06 17:00:35,140 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 5] total 17 [2021-01-06 17:00:35,140 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1156316427] [2021-01-06 17:00:35,141 INFO L461 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-01-06 17:00:35,141 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 17:00:35,142 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-01-06 17:00:35,144 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=66, Invalid=206, Unknown=0, NotChecked=0, Total=272 [2021-01-06 17:00:35,144 INFO L87 Difference]: Start difference. First operand 33 states and 35 transitions. Second operand 17 states. [2021-01-06 17:00:35,611 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 17:00:35,612 INFO L93 Difference]: Finished difference Result 49 states and 58 transitions. [2021-01-06 17:00:35,612 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-01-06 17:00:35,612 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 32 [2021-01-06 17:00:35,613 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 17:00:35,615 INFO L225 Difference]: With dead ends: 49 [2021-01-06 17:00:35,615 INFO L226 Difference]: Without dead ends: 40 [2021-01-06 17:00:35,616 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 31 SyntacticMatches, 1 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=102, Invalid=278, Unknown=0, NotChecked=0, Total=380 [2021-01-06 17:00:35,616 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2021-01-06 17:00:35,621 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 37. [2021-01-06 17:00:35,621 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2021-01-06 17:00:35,622 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 40 transitions. [2021-01-06 17:00:35,622 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 40 transitions. Word has length 32 [2021-01-06 17:00:35,622 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 17:00:35,622 INFO L481 AbstractCegarLoop]: Abstraction has 37 states and 40 transitions. [2021-01-06 17:00:35,623 INFO L482 AbstractCegarLoop]: Interpolant automaton has 17 states. [2021-01-06 17:00:35,623 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 40 transitions. [2021-01-06 17:00:35,623 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2021-01-06 17:00:35,624 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 17:00:35,624 INFO L422 BasicCegarLoop]: trace histogram [15, 12, 3, 1, 1, 1, 1, 1, 1] [2021-01-06 17:00:35,837 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2021-01-06 17:00:35,838 INFO L429 AbstractCegarLoop]: === Iteration 15 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 17:00:35,838 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 17:00:35,838 INFO L82 PathProgramCache]: Analyzing trace with hash 1350359876, now seen corresponding path program 10 times [2021-01-06 17:00:35,839 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 17:00:35,839 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [391179384] [2021-01-06 17:00:35,839 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 17:00:35,860 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 17:00:36,137 INFO L134 CoverageAnalysis]: Checked inductivity of 225 backedges. 65 proven. 156 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-01-06 17:00:36,138 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [391179384] [2021-01-06 17:00:36,138 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [587038777] [2021-01-06 17:00:36,138 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 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 17:00:36,188 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-01-06 17:00:36,188 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-01-06 17:00:36,189 INFO L263 TraceCheckSpWp]: Trace formula consists of 101 conjuncts, 28 conjunts are in the unsatisfiable core [2021-01-06 17:00:36,191 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-01-06 17:00:36,343 INFO L134 CoverageAnalysis]: Checked inductivity of 225 backedges. 65 proven. 156 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-01-06 17:00:36,344 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-01-06 17:00:36,344 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15] total 16 [2021-01-06 17:00:36,345 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [586358919] [2021-01-06 17:00:36,346 INFO L461 AbstractCegarLoop]: Interpolant automaton has 16 states [2021-01-06 17:00:36,346 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 17:00:36,347 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-01-06 17:00:36,347 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=198, Unknown=0, NotChecked=0, Total=240 [2021-01-06 17:00:36,347 INFO L87 Difference]: Start difference. First operand 37 states and 40 transitions. Second operand 16 states. [2021-01-06 17:00:36,603 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 17:00:36,603 INFO L93 Difference]: Finished difference Result 50 states and 57 transitions. [2021-01-06 17:00:36,604 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-01-06 17:00:36,604 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 36 [2021-01-06 17:00:36,604 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 17:00:36,605 INFO L225 Difference]: With dead ends: 50 [2021-01-06 17:00:36,605 INFO L226 Difference]: Without dead ends: 39 [2021-01-06 17:00:36,606 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 51 GetRequests, 34 SyntacticMatches, 3 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=42, Invalid=198, Unknown=0, NotChecked=0, Total=240 [2021-01-06 17:00:36,607 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2021-01-06 17:00:36,611 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2021-01-06 17:00:36,611 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2021-01-06 17:00:36,612 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 42 transitions. [2021-01-06 17:00:36,612 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 42 transitions. Word has length 36 [2021-01-06 17:00:36,612 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 17:00:36,612 INFO L481 AbstractCegarLoop]: Abstraction has 39 states and 42 transitions. [2021-01-06 17:00:36,612 INFO L482 AbstractCegarLoop]: Interpolant automaton has 16 states. [2021-01-06 17:00:36,613 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 42 transitions. [2021-01-06 17:00:36,613 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2021-01-06 17:00:36,613 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 17:00:36,613 INFO L422 BasicCegarLoop]: trace histogram [16, 13, 3, 1, 1, 1, 1, 1, 1] [2021-01-06 17:00:36,826 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2021-01-06 17:00:36,827 INFO L429 AbstractCegarLoop]: === Iteration 16 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 17:00:36,828 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 17:00:36,829 INFO L82 PathProgramCache]: Analyzing trace with hash -33157337, now seen corresponding path program 11 times [2021-01-06 17:00:36,829 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 17:00:36,830 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1529939414] [2021-01-06 17:00:36,830 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 17:00:36,843 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 17:00:37,130 INFO L134 CoverageAnalysis]: Checked inductivity of 256 backedges. 70 proven. 182 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-01-06 17:00:37,131 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1529939414] [2021-01-06 17:00:37,131 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1985600978] [2021-01-06 17:00:37,131 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 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 17:00:37,555 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 17 check-sat command(s) [2021-01-06 17:00:37,555 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-01-06 17:00:37,557 INFO L263 TraceCheckSpWp]: Trace formula consists of 105 conjuncts, 41 conjunts are in the unsatisfiable core [2021-01-06 17:00:37,559 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-01-06 17:00:37,878 INFO L134 CoverageAnalysis]: Checked inductivity of 256 backedges. 70 proven. 182 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-01-06 17:00:37,879 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-01-06 17:00:37,879 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16] total 17 [2021-01-06 17:00:37,879 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [79254165] [2021-01-06 17:00:37,880 INFO L461 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-01-06 17:00:37,880 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 17:00:37,880 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-01-06 17:00:37,881 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=227, Unknown=0, NotChecked=0, Total=272 [2021-01-06 17:00:37,881 INFO L87 Difference]: Start difference. First operand 39 states and 42 transitions. Second operand 17 states. [2021-01-06 17:00:38,170 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 17:00:38,171 INFO L93 Difference]: Finished difference Result 52 states and 59 transitions. [2021-01-06 17:00:38,171 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-01-06 17:00:38,171 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 38 [2021-01-06 17:00:38,173 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 17:00:38,174 INFO L225 Difference]: With dead ends: 52 [2021-01-06 17:00:38,174 INFO L226 Difference]: Without dead ends: 41 [2021-01-06 17:00:38,175 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 26 SyntacticMatches, 13 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=45, Invalid=227, Unknown=0, NotChecked=0, Total=272 [2021-01-06 17:00:38,176 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2021-01-06 17:00:38,183 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 41. [2021-01-06 17:00:38,183 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2021-01-06 17:00:38,186 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 44 transitions. [2021-01-06 17:00:38,187 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 44 transitions. Word has length 38 [2021-01-06 17:00:38,187 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 17:00:38,187 INFO L481 AbstractCegarLoop]: Abstraction has 41 states and 44 transitions. [2021-01-06 17:00:38,187 INFO L482 AbstractCegarLoop]: Interpolant automaton has 17 states. [2021-01-06 17:00:38,187 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 44 transitions. [2021-01-06 17:00:38,189 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2021-01-06 17:00:38,189 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 17:00:38,189 INFO L422 BasicCegarLoop]: trace histogram [17, 14, 3, 1, 1, 1, 1, 1, 1] [2021-01-06 17:00:38,395 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15,15 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-01-06 17:00:38,396 INFO L429 AbstractCegarLoop]: === Iteration 17 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 17:00:38,396 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 17:00:38,396 INFO L82 PathProgramCache]: Analyzing trace with hash 1846662730, now seen corresponding path program 12 times [2021-01-06 17:00:38,397 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 17:00:38,397 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [535721262] [2021-01-06 17:00:38,397 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 17:00:38,411 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 17:00:38,709 INFO L134 CoverageAnalysis]: Checked inductivity of 289 backedges. 75 proven. 210 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-01-06 17:00:38,710 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [535721262] [2021-01-06 17:00:38,710 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [587056028] [2021-01-06 17:00:38,710 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 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 17:00:38,928 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 15 check-sat command(s) [2021-01-06 17:00:38,928 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-01-06 17:00:38,929 INFO L263 TraceCheckSpWp]: Trace formula consists of 97 conjuncts, 32 conjunts are in the unsatisfiable core [2021-01-06 17:00:38,945 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-01-06 17:00:39,675 INFO L134 CoverageAnalysis]: Checked inductivity of 289 backedges. 143 proven. 72 refuted. 0 times theorem prover too weak. 74 trivial. 0 not checked. [2021-01-06 17:00:39,675 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-01-06 17:00:39,675 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 10] total 25 [2021-01-06 17:00:39,676 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [85042865] [2021-01-06 17:00:39,676 INFO L461 AbstractCegarLoop]: Interpolant automaton has 25 states [2021-01-06 17:00:39,676 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 17:00:39,677 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-01-06 17:00:39,678 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=126, Invalid=474, Unknown=0, NotChecked=0, Total=600 [2021-01-06 17:00:39,678 INFO L87 Difference]: Start difference. First operand 41 states and 44 transitions. Second operand 25 states. [2021-01-06 17:00:40,304 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 17:00:40,304 INFO L93 Difference]: Finished difference Result 65 states and 79 transitions. [2021-01-06 17:00:40,305 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2021-01-06 17:00:40,305 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 40 [2021-01-06 17:00:40,305 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 17:00:40,306 INFO L225 Difference]: With dead ends: 65 [2021-01-06 17:00:40,306 INFO L226 Difference]: Without dead ends: 54 [2021-01-06 17:00:40,307 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 31 SyntacticMatches, 3 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 70 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=143, Invalid=507, Unknown=0, NotChecked=0, Total=650 [2021-01-06 17:00:40,307 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2021-01-06 17:00:40,312 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 46. [2021-01-06 17:00:40,312 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2021-01-06 17:00:40,313 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 48 transitions. [2021-01-06 17:00:40,313 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 48 transitions. Word has length 40 [2021-01-06 17:00:40,313 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 17:00:40,313 INFO L481 AbstractCegarLoop]: Abstraction has 46 states and 48 transitions. [2021-01-06 17:00:40,313 INFO L482 AbstractCegarLoop]: Interpolant automaton has 25 states. [2021-01-06 17:00:40,314 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 48 transitions. [2021-01-06 17:00:40,314 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2021-01-06 17:00:40,314 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 17:00:40,314 INFO L422 BasicCegarLoop]: trace histogram [19, 15, 4, 1, 1, 1, 1, 1, 1] [2021-01-06 17:00:40,520 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2021-01-06 17:00:40,520 INFO L429 AbstractCegarLoop]: === Iteration 18 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 17:00:40,521 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 17:00:40,521 INFO L82 PathProgramCache]: Analyzing trace with hash -1664138286, now seen corresponding path program 13 times [2021-01-06 17:00:40,521 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 17:00:40,522 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [817296292] [2021-01-06 17:00:40,522 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 17:00:40,551 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 17:00:40,837 INFO L134 CoverageAnalysis]: Checked inductivity of 361 backedges. 112 proven. 240 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-01-06 17:00:40,838 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [817296292] [2021-01-06 17:00:40,838 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [272249225] [2021-01-06 17:00:40,838 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 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 17:00:40,893 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 17:00:40,895 INFO L263 TraceCheckSpWp]: Trace formula consists of 117 conjuncts, 34 conjunts are in the unsatisfiable core [2021-01-06 17:00:40,897 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-01-06 17:00:41,014 INFO L134 CoverageAnalysis]: Checked inductivity of 361 backedges. 112 proven. 240 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-01-06 17:00:41,015 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-01-06 17:00:41,015 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18] total 19 [2021-01-06 17:00:41,016 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [427948093] [2021-01-06 17:00:41,016 INFO L461 AbstractCegarLoop]: Interpolant automaton has 19 states [2021-01-06 17:00:41,016 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 17:00:41,017 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-01-06 17:00:41,017 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=291, Unknown=0, NotChecked=0, Total=342 [2021-01-06 17:00:41,017 INFO L87 Difference]: Start difference. First operand 46 states and 48 transitions. Second operand 19 states. [2021-01-06 17:00:41,390 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 17:00:41,390 INFO L93 Difference]: Finished difference Result 62 states and 67 transitions. [2021-01-06 17:00:41,391 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-01-06 17:00:41,391 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 44 [2021-01-06 17:00:41,391 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 17:00:41,392 INFO L225 Difference]: With dead ends: 62 [2021-01-06 17:00:41,392 INFO L226 Difference]: Without dead ends: 48 [2021-01-06 17:00:41,395 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 43 SyntacticMatches, 2 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=51, Invalid=291, Unknown=0, NotChecked=0, Total=342 [2021-01-06 17:00:41,396 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2021-01-06 17:00:41,403 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 48. [2021-01-06 17:00:41,404 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2021-01-06 17:00:41,404 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 50 transitions. [2021-01-06 17:00:41,404 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 50 transitions. Word has length 44 [2021-01-06 17:00:41,405 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 17:00:41,405 INFO L481 AbstractCegarLoop]: Abstraction has 48 states and 50 transitions. [2021-01-06 17:00:41,405 INFO L482 AbstractCegarLoop]: Interpolant automaton has 19 states. [2021-01-06 17:00:41,405 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 50 transitions. [2021-01-06 17:00:41,406 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2021-01-06 17:00:41,406 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 17:00:41,406 INFO L422 BasicCegarLoop]: trace histogram [20, 16, 4, 1, 1, 1, 1, 1, 1] [2021-01-06 17:00:41,621 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2021-01-06 17:00:41,622 INFO L429 AbstractCegarLoop]: === Iteration 19 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 17:00:41,623 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 17:00:41,623 INFO L82 PathProgramCache]: Analyzing trace with hash -870062923, now seen corresponding path program 14 times [2021-01-06 17:00:41,623 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 17:00:41,624 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [433337339] [2021-01-06 17:00:41,624 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 17:00:41,641 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 17:00:41,995 INFO L134 CoverageAnalysis]: Checked inductivity of 400 backedges. 119 proven. 272 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-01-06 17:00:41,995 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [433337339] [2021-01-06 17:00:41,995 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [713520325] [2021-01-06 17:00:41,996 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 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 17:00:42,055 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-01-06 17:00:42,056 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-01-06 17:00:42,057 INFO L263 TraceCheckSpWp]: Trace formula consists of 121 conjuncts, 43 conjunts are in the unsatisfiable core [2021-01-06 17:00:42,059 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-01-06 17:00:42,270 INFO L134 CoverageAnalysis]: Checked inductivity of 400 backedges. 0 proven. 400 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-01-06 17:00:42,271 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-01-06 17:00:42,271 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 23] total 24 [2021-01-06 17:00:42,271 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1943584757] [2021-01-06 17:00:42,271 INFO L461 AbstractCegarLoop]: Interpolant automaton has 24 states [2021-01-06 17:00:42,272 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 17:00:42,272 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-01-06 17:00:42,273 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=62, Invalid=490, Unknown=0, NotChecked=0, Total=552 [2021-01-06 17:00:42,273 INFO L87 Difference]: Start difference. First operand 48 states and 50 transitions. Second operand 24 states. [2021-01-06 17:00:42,813 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 17:00:42,813 INFO L93 Difference]: Finished difference Result 64 states and 69 transitions. [2021-01-06 17:00:42,814 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-01-06 17:00:42,814 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 46 [2021-01-06 17:00:42,814 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 17:00:42,815 INFO L225 Difference]: With dead ends: 64 [2021-01-06 17:00:42,815 INFO L226 Difference]: Without dead ends: 50 [2021-01-06 17:00:42,816 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 41 SyntacticMatches, 2 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=62, Invalid=490, Unknown=0, NotChecked=0, Total=552 [2021-01-06 17:00:42,816 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2021-01-06 17:00:42,838 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 50. [2021-01-06 17:00:42,838 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 50 states. [2021-01-06 17:00:42,838 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 52 transitions. [2021-01-06 17:00:42,839 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 52 transitions. Word has length 46 [2021-01-06 17:00:42,839 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 17:00:42,843 INFO L481 AbstractCegarLoop]: Abstraction has 50 states and 52 transitions. [2021-01-06 17:00:42,843 INFO L482 AbstractCegarLoop]: Interpolant automaton has 24 states. [2021-01-06 17:00:42,843 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 52 transitions. [2021-01-06 17:00:42,844 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2021-01-06 17:00:42,844 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 17:00:42,844 INFO L422 BasicCegarLoop]: trace histogram [21, 17, 4, 1, 1, 1, 1, 1, 1] [2021-01-06 17:00:43,062 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,18 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-01-06 17:00:43,062 INFO L429 AbstractCegarLoop]: === Iteration 20 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 17:00:43,063 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 17:00:43,063 INFO L82 PathProgramCache]: Analyzing trace with hash 2027149528, now seen corresponding path program 15 times [2021-01-06 17:00:43,063 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 17:00:43,064 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [75543651] [2021-01-06 17:00:43,064 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 17:00:43,082 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 17:00:43,513 INFO L134 CoverageAnalysis]: Checked inductivity of 441 backedges. 126 proven. 306 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-01-06 17:00:43,514 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [75543651] [2021-01-06 17:00:43,514 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1543297954] [2021-01-06 17:00:43,514 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 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 17:00:43,613 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2021-01-06 17:00:43,613 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-01-06 17:00:43,614 INFO L263 TraceCheckSpWp]: Trace formula consists of 77 conjuncts, 12 conjunts are in the unsatisfiable core [2021-01-06 17:00:43,616 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-01-06 17:00:43,906 INFO L134 CoverageAnalysis]: Checked inductivity of 441 backedges. 153 proven. 16 refuted. 0 times theorem prover too weak. 272 trivial. 0 not checked. [2021-01-06 17:00:43,906 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-01-06 17:00:43,906 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 7] total 25 [2021-01-06 17:00:43,906 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [283257083] [2021-01-06 17:00:43,907 INFO L461 AbstractCegarLoop]: Interpolant automaton has 25 states [2021-01-06 17:00:43,907 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 17:00:43,908 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-01-06 17:00:43,908 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=124, Invalid=476, Unknown=0, NotChecked=0, Total=600 [2021-01-06 17:00:43,908 INFO L87 Difference]: Start difference. First operand 50 states and 52 transitions. Second operand 25 states. [2021-01-06 17:00:45,005 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 17:00:45,006 INFO L93 Difference]: Finished difference Result 70 states and 78 transitions. [2021-01-06 17:00:45,006 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-01-06 17:00:45,006 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 48 [2021-01-06 17:00:45,007 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 17:00:45,007 INFO L225 Difference]: With dead ends: 70 [2021-01-06 17:00:45,008 INFO L226 Difference]: Without dead ends: 56 [2021-01-06 17:00:45,009 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 76 GetRequests, 47 SyntacticMatches, 1 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=204, Invalid=666, Unknown=0, NotChecked=0, Total=870 [2021-01-06 17:00:45,009 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2021-01-06 17:00:45,013 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 53. [2021-01-06 17:00:45,013 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53 states. [2021-01-06 17:00:45,013 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 55 transitions. [2021-01-06 17:00:45,014 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 55 transitions. Word has length 48 [2021-01-06 17:00:45,014 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 17:00:45,014 INFO L481 AbstractCegarLoop]: Abstraction has 53 states and 55 transitions. [2021-01-06 17:00:45,014 INFO L482 AbstractCegarLoop]: Interpolant automaton has 25 states. [2021-01-06 17:00:45,014 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 55 transitions. [2021-01-06 17:00:45,015 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2021-01-06 17:00:45,015 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 17:00:45,015 INFO L422 BasicCegarLoop]: trace histogram [23, 18, 5, 1, 1, 1, 1, 1, 1] [2021-01-06 17:00:45,218 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,19 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-01-06 17:00:45,219 INFO L429 AbstractCegarLoop]: === Iteration 21 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 17:00:45,219 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 17:00:45,220 INFO L82 PathProgramCache]: Analyzing trace with hash -1008695328, now seen corresponding path program 16 times [2021-01-06 17:00:45,220 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 17:00:45,220 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1566192607] [2021-01-06 17:00:45,221 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 17:00:45,237 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 17:00:45,657 INFO L134 CoverageAnalysis]: Checked inductivity of 529 backedges. 171 proven. 342 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-01-06 17:00:45,657 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1566192607] [2021-01-06 17:00:45,657 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [79057368] [2021-01-06 17:00:45,658 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 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 17:00:45,711 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-01-06 17:00:45,712 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-01-06 17:00:45,713 INFO L263 TraceCheckSpWp]: Trace formula consists of 133 conjuncts, 40 conjunts are in the unsatisfiable core [2021-01-06 17:00:45,714 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-01-06 17:00:45,858 INFO L134 CoverageAnalysis]: Checked inductivity of 529 backedges. 171 proven. 342 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-01-06 17:00:45,859 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-01-06 17:00:45,859 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21] total 22 [2021-01-06 17:00:45,859 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1127657155] [2021-01-06 17:00:45,859 INFO L461 AbstractCegarLoop]: Interpolant automaton has 22 states [2021-01-06 17:00:45,860 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 17:00:45,860 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-01-06 17:00:45,860 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=60, Invalid=402, Unknown=0, NotChecked=0, Total=462 [2021-01-06 17:00:45,861 INFO L87 Difference]: Start difference. First operand 53 states and 55 transitions. Second operand 22 states. [2021-01-06 17:00:46,424 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 17:00:46,425 INFO L93 Difference]: Finished difference Result 70 states and 75 transitions. [2021-01-06 17:00:46,426 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2021-01-06 17:00:46,426 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 52 [2021-01-06 17:00:46,427 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 17:00:46,427 INFO L225 Difference]: With dead ends: 70 [2021-01-06 17:00:46,427 INFO L226 Difference]: Without dead ends: 55 [2021-01-06 17:00:46,428 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 73 GetRequests, 51 SyntacticMatches, 2 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=60, Invalid=402, Unknown=0, NotChecked=0, Total=462 [2021-01-06 17:00:46,428 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2021-01-06 17:00:46,432 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 55. [2021-01-06 17:00:46,432 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2021-01-06 17:00:46,432 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 57 transitions. [2021-01-06 17:00:46,433 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 57 transitions. Word has length 52 [2021-01-06 17:00:46,433 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 17:00:46,433 INFO L481 AbstractCegarLoop]: Abstraction has 55 states and 57 transitions. [2021-01-06 17:00:46,433 INFO L482 AbstractCegarLoop]: Interpolant automaton has 22 states. [2021-01-06 17:00:46,433 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 57 transitions. [2021-01-06 17:00:46,434 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2021-01-06 17:00:46,434 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 17:00:46,434 INFO L422 BasicCegarLoop]: trace histogram [24, 19, 5, 1, 1, 1, 1, 1, 1] [2021-01-06 17:00:46,645 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20,20 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-01-06 17:00:46,645 INFO L429 AbstractCegarLoop]: === Iteration 22 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 17:00:46,646 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 17:00:46,647 INFO L82 PathProgramCache]: Analyzing trace with hash -1656515133, now seen corresponding path program 17 times [2021-01-06 17:00:46,647 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 17:00:46,647 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [646893150] [2021-01-06 17:00:46,647 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 17:00:46,677 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 17:00:47,140 INFO L134 CoverageAnalysis]: Checked inductivity of 576 backedges. 180 proven. 380 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-01-06 17:00:47,140 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [646893150] [2021-01-06 17:00:47,140 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [231656107] [2021-01-06 17:00:47,140 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 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 17:00:48,162 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 25 check-sat command(s) [2021-01-06 17:00:48,162 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-01-06 17:00:48,165 WARN L261 TraceCheckSpWp]: Trace formula consists of 137 conjuncts, 69 conjunts are in the unsatisfiable core [2021-01-06 17:00:48,167 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-01-06 17:00:48,773 INFO L134 CoverageAnalysis]: Checked inductivity of 576 backedges. 180 proven. 380 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-01-06 17:00:48,773 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-01-06 17:00:48,774 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22] total 23 [2021-01-06 17:00:48,775 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1991894026] [2021-01-06 17:00:48,775 INFO L461 AbstractCegarLoop]: Interpolant automaton has 23 states [2021-01-06 17:00:48,775 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 17:00:48,776 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-01-06 17:00:48,776 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=63, Invalid=443, Unknown=0, NotChecked=0, Total=506 [2021-01-06 17:00:48,777 INFO L87 Difference]: Start difference. First operand 55 states and 57 transitions. Second operand 23 states. [2021-01-06 17:00:49,436 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 17:00:49,436 INFO L93 Difference]: Finished difference Result 72 states and 77 transitions. [2021-01-06 17:00:49,438 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-01-06 17:00:49,439 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 54 [2021-01-06 17:00:49,439 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 17:00:49,439 INFO L225 Difference]: With dead ends: 72 [2021-01-06 17:00:49,439 INFO L226 Difference]: Without dead ends: 57 [2021-01-06 17:00:49,440 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 76 GetRequests, 34 SyntacticMatches, 21 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 38 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=63, Invalid=443, Unknown=0, NotChecked=0, Total=506 [2021-01-06 17:00:49,440 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2021-01-06 17:00:49,445 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 57. [2021-01-06 17:00:49,445 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2021-01-06 17:00:49,445 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 59 transitions. [2021-01-06 17:00:49,446 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 59 transitions. Word has length 54 [2021-01-06 17:00:49,446 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 17:00:49,454 INFO L481 AbstractCegarLoop]: Abstraction has 57 states and 59 transitions. [2021-01-06 17:00:49,454 INFO L482 AbstractCegarLoop]: Interpolant automaton has 23 states. [2021-01-06 17:00:49,454 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 59 transitions. [2021-01-06 17:00:49,455 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2021-01-06 17:00:49,455 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 17:00:49,455 INFO L422 BasicCegarLoop]: trace histogram [25, 20, 5, 1, 1, 1, 1, 1, 1] [2021-01-06 17:00:49,659 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable21 [2021-01-06 17:00:49,659 INFO L429 AbstractCegarLoop]: === Iteration 23 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 17:00:49,660 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 17:00:49,661 INFO L82 PathProgramCache]: Analyzing trace with hash -1441089818, now seen corresponding path program 18 times [2021-01-06 17:00:49,661 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 17:00:49,661 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [561325192] [2021-01-06 17:00:49,662 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 17:00:49,680 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 17:00:50,195 INFO L134 CoverageAnalysis]: Checked inductivity of 625 backedges. 189 proven. 420 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-01-06 17:00:50,195 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [561325192] [2021-01-06 17:00:50,195 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1705488939] [2021-01-06 17:00:50,195 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 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 17:00:50,517 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 23 check-sat command(s) [2021-01-06 17:00:50,517 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-01-06 17:00:50,518 INFO L263 TraceCheckSpWp]: Trace formula consists of 129 conjuncts, 18 conjunts are in the unsatisfiable core [2021-01-06 17:00:50,519 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-01-06 17:00:50,989 INFO L134 CoverageAnalysis]: Checked inductivity of 625 backedges. 220 proven. 25 refuted. 0 times theorem prover too weak. 380 trivial. 0 not checked. [2021-01-06 17:00:50,990 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-01-06 17:00:50,990 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 8] total 29 [2021-01-06 17:00:50,990 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1271558043] [2021-01-06 17:00:50,991 INFO L461 AbstractCegarLoop]: Interpolant automaton has 29 states [2021-01-06 17:00:50,991 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 17:00:50,991 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2021-01-06 17:00:50,992 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=150, Invalid=662, Unknown=0, NotChecked=0, Total=812 [2021-01-06 17:00:50,992 INFO L87 Difference]: Start difference. First operand 57 states and 59 transitions. Second operand 29 states. [2021-01-06 17:00:52,686 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 17:00:52,687 INFO L93 Difference]: Finished difference Result 79 states and 88 transitions. [2021-01-06 17:00:52,687 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2021-01-06 17:00:52,687 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 56 [2021-01-06 17:00:52,688 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 17:00:52,688 INFO L225 Difference]: With dead ends: 79 [2021-01-06 17:00:52,688 INFO L226 Difference]: Without dead ends: 64 [2021-01-06 17:00:52,689 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 89 GetRequests, 54 SyntacticMatches, 2 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 41 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=216, Invalid=974, Unknown=0, NotChecked=0, Total=1190 [2021-01-06 17:00:52,690 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2021-01-06 17:00:52,694 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 62. [2021-01-06 17:00:52,694 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 62 states. [2021-01-06 17:00:52,694 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 64 transitions. [2021-01-06 17:00:52,695 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 64 transitions. Word has length 56 [2021-01-06 17:00:52,695 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 17:00:52,695 INFO L481 AbstractCegarLoop]: Abstraction has 62 states and 64 transitions. [2021-01-06 17:00:52,695 INFO L482 AbstractCegarLoop]: Interpolant automaton has 29 states. [2021-01-06 17:00:52,695 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 64 transitions. [2021-01-06 17:00:52,696 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2021-01-06 17:00:52,696 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 17:00:52,696 INFO L422 BasicCegarLoop]: trace histogram [27, 21, 6, 1, 1, 1, 1, 1, 1] [2021-01-06 17:00:52,896 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable22 [2021-01-06 17:00:52,897 INFO L429 AbstractCegarLoop]: === Iteration 24 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 17:00:52,897 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 17:00:52,898 INFO L82 PathProgramCache]: Analyzing trace with hash 766560110, now seen corresponding path program 19 times [2021-01-06 17:00:52,898 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 17:00:52,898 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [576668211] [2021-01-06 17:00:52,898 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 17:00:52,919 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 17:00:53,462 INFO L134 CoverageAnalysis]: Checked inductivity of 729 backedges. 242 proven. 462 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2021-01-06 17:00:53,462 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [576668211] [2021-01-06 17:00:53,462 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [984905713] [2021-01-06 17:00:53,462 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 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 17:00:53,515 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 17:00:53,517 INFO L263 TraceCheckSpWp]: Trace formula consists of 149 conjuncts, 46 conjunts are in the unsatisfiable core [2021-01-06 17:00:53,518 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-01-06 17:00:53,696 INFO L134 CoverageAnalysis]: Checked inductivity of 729 backedges. 242 proven. 462 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2021-01-06 17:00:53,696 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-01-06 17:00:53,696 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24] total 25 [2021-01-06 17:00:53,697 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1510569476] [2021-01-06 17:00:53,698 INFO L461 AbstractCegarLoop]: Interpolant automaton has 25 states [2021-01-06 17:00:53,698 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 17:00:53,699 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-01-06 17:00:53,699 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=69, Invalid=531, Unknown=0, NotChecked=0, Total=600 [2021-01-06 17:00:53,699 INFO L87 Difference]: Start difference. First operand 62 states and 64 transitions. Second operand 25 states. [2021-01-06 17:00:54,441 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 17:00:54,441 INFO L93 Difference]: Finished difference Result 82 states and 87 transitions. [2021-01-06 17:00:54,442 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2021-01-06 17:00:54,442 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 60 [2021-01-06 17:00:54,442 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 17:00:54,443 INFO L225 Difference]: With dead ends: 82 [2021-01-06 17:00:54,443 INFO L226 Difference]: Without dead ends: 64 [2021-01-06 17:00:54,444 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 84 GetRequests, 58 SyntacticMatches, 3 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=69, Invalid=531, Unknown=0, NotChecked=0, Total=600 [2021-01-06 17:00:54,444 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2021-01-06 17:00:54,449 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 64. [2021-01-06 17:00:54,449 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 64 states. [2021-01-06 17:00:54,449 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 66 transitions. [2021-01-06 17:00:54,450 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 66 transitions. Word has length 60 [2021-01-06 17:00:54,450 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 17:00:54,450 INFO L481 AbstractCegarLoop]: Abstraction has 64 states and 66 transitions. [2021-01-06 17:00:54,450 INFO L482 AbstractCegarLoop]: Interpolant automaton has 25 states. [2021-01-06 17:00:54,450 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 66 transitions. [2021-01-06 17:00:54,451 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2021-01-06 17:00:54,451 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 17:00:54,451 INFO L422 BasicCegarLoop]: trace histogram [28, 22, 6, 1, 1, 1, 1, 1, 1] [2021-01-06 17:00:54,665 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23,23 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-01-06 17:00:54,666 INFO L429 AbstractCegarLoop]: === Iteration 25 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 17:00:54,666 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 17:00:54,667 INFO L82 PathProgramCache]: Analyzing trace with hash -429571503, now seen corresponding path program 20 times [2021-01-06 17:00:54,667 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 17:00:54,667 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1512176507] [2021-01-06 17:00:54,667 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 17:00:54,688 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 17:00:55,281 INFO L134 CoverageAnalysis]: Checked inductivity of 784 backedges. 253 proven. 506 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2021-01-06 17:00:55,282 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1512176507] [2021-01-06 17:00:55,282 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [828424010] [2021-01-06 17:00:55,282 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 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 17:00:55,336 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-01-06 17:00:55,336 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-01-06 17:00:55,338 INFO L263 TraceCheckSpWp]: Trace formula consists of 153 conjuncts, 59 conjunts are in the unsatisfiable core [2021-01-06 17:00:55,340 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-01-06 17:00:55,714 INFO L134 CoverageAnalysis]: Checked inductivity of 784 backedges. 0 proven. 784 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-01-06 17:00:55,714 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-01-06 17:00:55,715 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 31] total 32 [2021-01-06 17:00:55,715 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [322945836] [2021-01-06 17:00:55,715 INFO L461 AbstractCegarLoop]: Interpolant automaton has 32 states [2021-01-06 17:00:55,715 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 17:00:55,716 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2021-01-06 17:00:55,717 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=84, Invalid=908, Unknown=0, NotChecked=0, Total=992 [2021-01-06 17:00:55,717 INFO L87 Difference]: Start difference. First operand 64 states and 66 transitions. Second operand 32 states. [2021-01-06 17:00:56,714 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 17:00:56,715 INFO L93 Difference]: Finished difference Result 84 states and 89 transitions. [2021-01-06 17:00:56,715 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2021-01-06 17:00:56,716 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 62 [2021-01-06 17:00:56,716 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 17:00:56,717 INFO L225 Difference]: With dead ends: 84 [2021-01-06 17:00:56,717 INFO L226 Difference]: Without dead ends: 66 [2021-01-06 17:00:56,717 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 87 GetRequests, 55 SyntacticMatches, 2 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=84, Invalid=908, Unknown=0, NotChecked=0, Total=992 [2021-01-06 17:00:56,718 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2021-01-06 17:00:56,723 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 66. [2021-01-06 17:00:56,723 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 66 states. [2021-01-06 17:00:56,724 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 68 transitions. [2021-01-06 17:00:56,724 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 68 transitions. Word has length 62 [2021-01-06 17:00:56,724 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 17:00:56,724 INFO L481 AbstractCegarLoop]: Abstraction has 66 states and 68 transitions. [2021-01-06 17:00:56,724 INFO L482 AbstractCegarLoop]: Interpolant automaton has 32 states. [2021-01-06 17:00:56,724 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 68 transitions. [2021-01-06 17:00:56,725 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2021-01-06 17:00:56,725 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 17:00:56,725 INFO L422 BasicCegarLoop]: trace histogram [29, 23, 6, 1, 1, 1, 1, 1, 1] [2021-01-06 17:00:56,927 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable24 [2021-01-06 17:00:56,928 INFO L429 AbstractCegarLoop]: === Iteration 26 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 17:00:56,928 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 17:00:56,929 INFO L82 PathProgramCache]: Analyzing trace with hash 1139183732, now seen corresponding path program 21 times [2021-01-06 17:00:56,929 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 17:00:56,929 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1091471058] [2021-01-06 17:00:56,929 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 17:00:56,949 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 17:00:57,552 INFO L134 CoverageAnalysis]: Checked inductivity of 841 backedges. 264 proven. 552 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2021-01-06 17:00:57,553 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1091471058] [2021-01-06 17:00:57,553 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1727941342] [2021-01-06 17:00:57,553 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 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 17:00:57,707 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 14 check-sat command(s) [2021-01-06 17:00:57,708 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-01-06 17:00:57,709 INFO L263 TraceCheckSpWp]: Trace formula consists of 93 conjuncts, 28 conjunts are in the unsatisfiable core [2021-01-06 17:00:57,710 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-01-06 17:00:59,185 INFO L134 CoverageAnalysis]: Checked inductivity of 841 backedges. 299 proven. 36 refuted. 0 times theorem prover too weak. 506 trivial. 0 not checked. [2021-01-06 17:00:59,186 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-01-06 17:00:59,186 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 9] total 33 [2021-01-06 17:00:59,186 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1325127600] [2021-01-06 17:00:59,186 INFO L461 AbstractCegarLoop]: Interpolant automaton has 33 states [2021-01-06 17:00:59,187 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 17:00:59,187 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2021-01-06 17:00:59,188 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=108, Invalid=948, Unknown=0, NotChecked=0, Total=1056 [2021-01-06 17:00:59,188 INFO L87 Difference]: Start difference. First operand 66 states and 68 transitions. Second operand 33 states. [2021-01-06 17:01:00,857 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 17:01:00,858 INFO L93 Difference]: Finished difference Result 88 states and 95 transitions. [2021-01-06 17:01:00,858 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2021-01-06 17:01:00,859 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 64 [2021-01-06 17:01:00,859 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 17:01:00,863 INFO L225 Difference]: With dead ends: 88 [2021-01-06 17:01:00,864 INFO L226 Difference]: Without dead ends: 70 [2021-01-06 17:01:00,864 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 91 GetRequests, 52 SyntacticMatches, 7 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=134, Invalid=988, Unknown=0, NotChecked=0, Total=1122 [2021-01-06 17:01:00,864 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2021-01-06 17:01:00,869 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 70. [2021-01-06 17:01:00,869 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 70 states. [2021-01-06 17:01:00,870 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 72 transitions. [2021-01-06 17:01:00,870 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 72 transitions. Word has length 64 [2021-01-06 17:01:00,870 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 17:01:00,870 INFO L481 AbstractCegarLoop]: Abstraction has 70 states and 72 transitions. [2021-01-06 17:01:00,870 INFO L482 AbstractCegarLoop]: Interpolant automaton has 33 states. [2021-01-06 17:01:00,870 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 72 transitions. [2021-01-06 17:01:00,871 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2021-01-06 17:01:00,871 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 17:01:00,871 INFO L422 BasicCegarLoop]: trace histogram [31, 24, 7, 1, 1, 1, 1, 1, 1] [2021-01-06 17:01:01,074 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25,25 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-01-06 17:01:01,075 INFO L429 AbstractCegarLoop]: === Iteration 27 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 17:01:01,075 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 17:01:01,076 INFO L82 PathProgramCache]: Analyzing trace with hash -373808516, now seen corresponding path program 22 times [2021-01-06 17:01:01,076 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 17:01:01,076 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [586867830] [2021-01-06 17:01:01,076 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 17:01:01,099 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 17:01:01,761 INFO L134 CoverageAnalysis]: Checked inductivity of 961 backedges. 325 proven. 600 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2021-01-06 17:01:01,761 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [586867830] [2021-01-06 17:01:01,762 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [985389922] [2021-01-06 17:01:01,762 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 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 17:01:01,817 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-01-06 17:01:01,817 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-01-06 17:01:01,819 INFO L263 TraceCheckSpWp]: Trace formula consists of 165 conjuncts, 52 conjunts are in the unsatisfiable core [2021-01-06 17:01:01,820 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-01-06 17:01:02,036 INFO L134 CoverageAnalysis]: Checked inductivity of 961 backedges. 325 proven. 600 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2021-01-06 17:01:02,037 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-01-06 17:01:02,037 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 27] total 28 [2021-01-06 17:01:02,038 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [598893666] [2021-01-06 17:01:02,038 INFO L461 AbstractCegarLoop]: Interpolant automaton has 28 states [2021-01-06 17:01:02,038 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 17:01:02,039 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2021-01-06 17:01:02,039 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=678, Unknown=0, NotChecked=0, Total=756 [2021-01-06 17:01:02,039 INFO L87 Difference]: Start difference. First operand 70 states and 72 transitions. Second operand 28 states. [2021-01-06 17:01:03,180 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 17:01:03,181 INFO L93 Difference]: Finished difference Result 92 states and 97 transitions. [2021-01-06 17:01:03,181 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2021-01-06 17:01:03,182 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 68 [2021-01-06 17:01:03,182 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 17:01:03,183 INFO L225 Difference]: With dead ends: 92 [2021-01-06 17:01:03,183 INFO L226 Difference]: Without dead ends: 72 [2021-01-06 17:01:03,184 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 95 GetRequests, 66 SyntacticMatches, 3 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=78, Invalid=678, Unknown=0, NotChecked=0, Total=756 [2021-01-06 17:01:03,185 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2021-01-06 17:01:03,189 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 72. [2021-01-06 17:01:03,189 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 72 states. [2021-01-06 17:01:03,190 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 74 transitions. [2021-01-06 17:01:03,190 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 74 transitions. Word has length 68 [2021-01-06 17:01:03,190 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 17:01:03,190 INFO L481 AbstractCegarLoop]: Abstraction has 72 states and 74 transitions. [2021-01-06 17:01:03,191 INFO L482 AbstractCegarLoop]: Interpolant automaton has 28 states. [2021-01-06 17:01:03,191 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 74 transitions. [2021-01-06 17:01:03,191 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2021-01-06 17:01:03,191 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 17:01:03,192 INFO L422 BasicCegarLoop]: trace histogram [32, 25, 7, 1, 1, 1, 1, 1, 1] [2021-01-06 17:01:03,404 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable26 [2021-01-06 17:01:03,405 INFO L429 AbstractCegarLoop]: === Iteration 28 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 17:01:03,405 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 17:01:03,406 INFO L82 PathProgramCache]: Analyzing trace with hash -1006564769, now seen corresponding path program 23 times [2021-01-06 17:01:03,406 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 17:01:03,406 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1246439275] [2021-01-06 17:01:03,406 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 17:01:03,428 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 17:01:04,197 INFO L134 CoverageAnalysis]: Checked inductivity of 1024 backedges. 338 proven. 650 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2021-01-06 17:01:04,197 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1246439275] [2021-01-06 17:01:04,198 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [684601933] [2021-01-06 17:01:04,198 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 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 17:01:13,840 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 33 check-sat command(s) [2021-01-06 17:01:13,840 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-01-06 17:01:13,849 INFO L263 TraceCheckSpWp]: Trace formula consists of 169 conjuncts, 58 conjunts are in the unsatisfiable core [2021-01-06 17:01:13,850 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-01-06 17:01:14,148 INFO L134 CoverageAnalysis]: Checked inductivity of 1024 backedges. 252 proven. 756 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-01-06 17:01:14,148 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-01-06 17:01:14,148 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 30] total 31 [2021-01-06 17:01:14,148 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [562538990] [2021-01-06 17:01:14,149 INFO L461 AbstractCegarLoop]: Interpolant automaton has 31 states [2021-01-06 17:01:14,149 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 17:01:14,149 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2021-01-06 17:01:14,150 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=85, Invalid=845, Unknown=0, NotChecked=0, Total=930 [2021-01-06 17:01:14,150 INFO L87 Difference]: Start difference. First operand 72 states and 74 transitions. Second operand 31 states. [2021-01-06 17:01:15,358 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 17:01:15,358 INFO L93 Difference]: Finished difference Result 94 states and 99 transitions. [2021-01-06 17:01:15,358 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2021-01-06 17:01:15,359 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 70 [2021-01-06 17:01:15,359 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 17:01:15,360 INFO L225 Difference]: With dead ends: 94 [2021-01-06 17:01:15,360 INFO L226 Difference]: Without dead ends: 74 [2021-01-06 17:01:15,361 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 98 GetRequests, 66 SyntacticMatches, 3 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=85, Invalid=845, Unknown=0, NotChecked=0, Total=930 [2021-01-06 17:01:15,361 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 74 states. [2021-01-06 17:01:15,366 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 74 to 74. [2021-01-06 17:01:15,366 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 74 states. [2021-01-06 17:01:15,367 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 74 states to 74 states and 76 transitions. [2021-01-06 17:01:15,367 INFO L78 Accepts]: Start accepts. Automaton has 74 states and 76 transitions. Word has length 70 [2021-01-06 17:01:15,367 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 17:01:15,367 INFO L481 AbstractCegarLoop]: Abstraction has 74 states and 76 transitions. [2021-01-06 17:01:15,367 INFO L482 AbstractCegarLoop]: Interpolant automaton has 31 states. [2021-01-06 17:01:15,367 INFO L276 IsEmpty]: Start isEmpty. Operand 74 states and 76 transitions. [2021-01-06 17:01:15,368 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 73 [2021-01-06 17:01:15,368 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 17:01:15,368 INFO L422 BasicCegarLoop]: trace histogram [33, 26, 7, 1, 1, 1, 1, 1, 1] [2021-01-06 17:01:15,569 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable27 [2021-01-06 17:01:15,569 INFO L429 AbstractCegarLoop]: === Iteration 29 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 17:01:15,570 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 17:01:15,570 INFO L82 PathProgramCache]: Analyzing trace with hash 800032130, now seen corresponding path program 24 times [2021-01-06 17:01:15,570 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 17:01:15,571 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1477635493] [2021-01-06 17:01:15,571 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 17:01:15,593 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 17:01:16,434 INFO L134 CoverageAnalysis]: Checked inductivity of 1089 backedges. 351 proven. 702 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2021-01-06 17:01:16,435 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1477635493] [2021-01-06 17:01:16,435 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [588212251] [2021-01-06 17:01:16,435 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 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 17:01:17,291 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 31 check-sat command(s) [2021-01-06 17:01:17,291 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-01-06 17:01:17,294 INFO L263 TraceCheckSpWp]: Trace formula consists of 161 conjuncts, 29 conjunts are in the unsatisfiable core [2021-01-06 17:01:17,296 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-01-06 17:01:18,480 INFO L134 CoverageAnalysis]: Checked inductivity of 1089 backedges. 390 proven. 49 refuted. 0 times theorem prover too weak. 650 trivial. 0 not checked. [2021-01-06 17:01:18,481 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-01-06 17:01:18,481 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 10] total 37 [2021-01-06 17:01:18,481 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1068717641] [2021-01-06 17:01:18,482 INFO L461 AbstractCegarLoop]: Interpolant automaton has 37 states [2021-01-06 17:01:18,482 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 17:01:18,482 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2021-01-06 17:01:18,483 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=202, Invalid=1130, Unknown=0, NotChecked=0, Total=1332 [2021-01-06 17:01:18,483 INFO L87 Difference]: Start difference. First operand 74 states and 76 transitions. Second operand 37 states. [2021-01-06 17:01:23,458 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 17:01:23,458 INFO L93 Difference]: Finished difference Result 100 states and 108 transitions. [2021-01-06 17:01:23,459 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2021-01-06 17:01:23,459 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 72 [2021-01-06 17:01:23,460 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 17:01:23,460 INFO L225 Difference]: With dead ends: 100 [2021-01-06 17:01:23,460 INFO L226 Difference]: Without dead ends: 80 [2021-01-06 17:01:23,462 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 115 GetRequests, 69 SyntacticMatches, 3 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 73 ImplicationChecksByTransitivity, 5.2s TimeCoverageRelationStatistics Valid=294, Invalid=1686, Unknown=0, NotChecked=0, Total=1980 [2021-01-06 17:01:23,463 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 80 states. [2021-01-06 17:01:23,469 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 80 to 78. [2021-01-06 17:01:23,469 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 78 states. [2021-01-06 17:01:23,470 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 78 states to 78 states and 80 transitions. [2021-01-06 17:01:23,470 INFO L78 Accepts]: Start accepts. Automaton has 78 states and 80 transitions. Word has length 72 [2021-01-06 17:01:23,471 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 17:01:23,471 INFO L481 AbstractCegarLoop]: Abstraction has 78 states and 80 transitions. [2021-01-06 17:01:23,471 INFO L482 AbstractCegarLoop]: Interpolant automaton has 37 states. [2021-01-06 17:01:23,471 INFO L276 IsEmpty]: Start isEmpty. Operand 78 states and 80 transitions. [2021-01-06 17:01:23,472 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2021-01-06 17:01:23,472 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 17:01:23,472 INFO L422 BasicCegarLoop]: trace histogram [35, 27, 8, 1, 1, 1, 1, 1, 1] [2021-01-06 17:01:23,677 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable28 [2021-01-06 17:01:23,677 INFO L429 AbstractCegarLoop]: === Iteration 30 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 17:01:23,678 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 17:01:23,678 INFO L82 PathProgramCache]: Analyzing trace with hash -1327056630, now seen corresponding path program 25 times [2021-01-06 17:01:23,679 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 17:01:23,679 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [425409340] [2021-01-06 17:01:23,679 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 17:01:23,703 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 17:01:24,775 INFO L134 CoverageAnalysis]: Checked inductivity of 1225 backedges. 420 proven. 756 refuted. 0 times theorem prover too weak. 49 trivial. 0 not checked. [2021-01-06 17:01:24,776 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [425409340] [2021-01-06 17:01:24,776 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1284800019] [2021-01-06 17:01:24,776 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 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 17:01:24,861 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 17:01:24,863 INFO L263 TraceCheckSpWp]: Trace formula consists of 181 conjuncts, 58 conjunts are in the unsatisfiable core [2021-01-06 17:01:24,865 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-01-06 17:01:25,121 INFO L134 CoverageAnalysis]: Checked inductivity of 1225 backedges. 420 proven. 756 refuted. 0 times theorem prover too weak. 49 trivial. 0 not checked. [2021-01-06 17:01:25,121 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-01-06 17:01:25,121 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 30] total 31 [2021-01-06 17:01:25,122 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [913545394] [2021-01-06 17:01:25,122 INFO L461 AbstractCegarLoop]: Interpolant automaton has 31 states [2021-01-06 17:01:25,123 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 17:01:25,123 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2021-01-06 17:01:25,124 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=87, Invalid=843, Unknown=0, NotChecked=0, Total=930 [2021-01-06 17:01:25,124 INFO L87 Difference]: Start difference. First operand 78 states and 80 transitions. Second operand 31 states. [2021-01-06 17:01:26,612 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 17:01:26,613 INFO L93 Difference]: Finished difference Result 102 states and 107 transitions. [2021-01-06 17:01:26,614 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2021-01-06 17:01:26,614 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 76 [2021-01-06 17:01:26,615 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 17:01:26,615 INFO L225 Difference]: With dead ends: 102 [2021-01-06 17:01:26,615 INFO L226 Difference]: Without dead ends: 80 [2021-01-06 17:01:26,616 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 106 GetRequests, 74 SyntacticMatches, 3 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=87, Invalid=843, Unknown=0, NotChecked=0, Total=930 [2021-01-06 17:01:26,617 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 80 states. [2021-01-06 17:01:26,622 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 80 to 80. [2021-01-06 17:01:26,622 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 80 states. [2021-01-06 17:01:26,623 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 82 transitions. [2021-01-06 17:01:26,623 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 82 transitions. Word has length 76 [2021-01-06 17:01:26,623 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 17:01:26,623 INFO L481 AbstractCegarLoop]: Abstraction has 80 states and 82 transitions. [2021-01-06 17:01:26,623 INFO L482 AbstractCegarLoop]: Interpolant automaton has 31 states. [2021-01-06 17:01:26,624 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 82 transitions. [2021-01-06 17:01:26,624 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2021-01-06 17:01:26,624 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 17:01:26,625 INFO L422 BasicCegarLoop]: trace histogram [36, 28, 8, 1, 1, 1, 1, 1, 1] [2021-01-06 17:01:26,838 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29,29 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-01-06 17:01:26,839 INFO L429 AbstractCegarLoop]: === Iteration 31 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 17:01:26,839 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 17:01:26,840 INFO L82 PathProgramCache]: Analyzing trace with hash -66646547, now seen corresponding path program 26 times [2021-01-06 17:01:26,840 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 17:01:26,840 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1801970413] [2021-01-06 17:01:26,840 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 17:01:26,866 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 17:01:27,912 INFO L134 CoverageAnalysis]: Checked inductivity of 1296 backedges. 435 proven. 812 refuted. 0 times theorem prover too weak. 49 trivial. 0 not checked. [2021-01-06 17:01:27,913 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1801970413] [2021-01-06 17:01:27,913 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1886759688] [2021-01-06 17:01:27,913 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 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 [2021-01-06 17:01:27,979 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-01-06 17:01:27,979 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-01-06 17:01:27,981 INFO L263 TraceCheckSpWp]: Trace formula consists of 185 conjuncts, 75 conjunts are in the unsatisfiable core [2021-01-06 17:01:27,982 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-01-06 17:01:28,740 INFO L134 CoverageAnalysis]: Checked inductivity of 1296 backedges. 0 proven. 1296 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-01-06 17:01:28,741 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-01-06 17:01:28,741 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 39] total 40 [2021-01-06 17:01:28,742 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [558337549] [2021-01-06 17:01:28,742 INFO L461 AbstractCegarLoop]: Interpolant automaton has 40 states [2021-01-06 17:01:28,742 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 17:01:28,743 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2021-01-06 17:01:28,744 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=106, Invalid=1454, Unknown=0, NotChecked=0, Total=1560 [2021-01-06 17:01:28,744 INFO L87 Difference]: Start difference. First operand 80 states and 82 transitions. Second operand 40 states. [2021-01-06 17:01:30,665 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 17:01:30,666 INFO L93 Difference]: Finished difference Result 104 states and 109 transitions. [2021-01-06 17:01:30,666 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2021-01-06 17:01:30,667 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 78 [2021-01-06 17:01:30,667 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 17:01:30,668 INFO L225 Difference]: With dead ends: 104 [2021-01-06 17:01:30,668 INFO L226 Difference]: Without dead ends: 82 [2021-01-06 17:01:30,670 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 109 GetRequests, 69 SyntacticMatches, 2 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=106, Invalid=1454, Unknown=0, NotChecked=0, Total=1560 [2021-01-06 17:01:30,670 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2021-01-06 17:01:30,676 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 82. [2021-01-06 17:01:30,676 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 82 states. [2021-01-06 17:01:30,677 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 82 states to 82 states and 84 transitions. [2021-01-06 17:01:30,677 INFO L78 Accepts]: Start accepts. Automaton has 82 states and 84 transitions. Word has length 78 [2021-01-06 17:01:30,677 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 17:01:30,677 INFO L481 AbstractCegarLoop]: Abstraction has 82 states and 84 transitions. [2021-01-06 17:01:30,677 INFO L482 AbstractCegarLoop]: Interpolant automaton has 40 states. [2021-01-06 17:01:30,677 INFO L276 IsEmpty]: Start isEmpty. Operand 82 states and 84 transitions. [2021-01-06 17:01:30,678 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2021-01-06 17:01:30,678 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 17:01:30,679 INFO L422 BasicCegarLoop]: trace histogram [37, 29, 8, 1, 1, 1, 1, 1, 1] [2021-01-06 17:01:30,880 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 30 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable30 [2021-01-06 17:01:30,881 INFO L429 AbstractCegarLoop]: === Iteration 32 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 17:01:30,881 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 17:01:30,882 INFO L82 PathProgramCache]: Analyzing trace with hash 6665744, now seen corresponding path program 27 times [2021-01-06 17:01:30,882 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 17:01:30,882 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1646189830] [2021-01-06 17:01:30,882 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 17:01:30,908 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 17:01:31,971 INFO L134 CoverageAnalysis]: Checked inductivity of 1369 backedges. 450 proven. 870 refuted. 0 times theorem prover too weak. 49 trivial. 0 not checked. [2021-01-06 17:01:31,972 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1646189830] [2021-01-06 17:01:31,972 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1687944593] [2021-01-06 17:01:31,972 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 31 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 31 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-01-06 17:01:32,271 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 18 check-sat command(s) [2021-01-06 17:01:32,271 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-01-06 17:01:32,273 INFO L263 TraceCheckSpWp]: Trace formula consists of 109 conjuncts, 28 conjunts are in the unsatisfiable core [2021-01-06 17:01:32,275 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-01-06 17:01:34,272 INFO L134 CoverageAnalysis]: Checked inductivity of 1369 backedges. 493 proven. 64 refuted. 0 times theorem prover too weak. 812 trivial. 0 not checked. [2021-01-06 17:01:34,273 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-01-06 17:01:34,273 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 11] total 41 [2021-01-06 17:01:34,273 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1627052270] [2021-01-06 17:01:34,274 INFO L461 AbstractCegarLoop]: Interpolant automaton has 41 states [2021-01-06 17:01:34,274 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 17:01:34,274 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2021-01-06 17:01:34,282 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=186, Invalid=1454, Unknown=0, NotChecked=0, Total=1640 [2021-01-06 17:01:34,282 INFO L87 Difference]: Start difference. First operand 82 states and 84 transitions. Second operand 41 states. [2021-01-06 17:01:40,294 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 17:01:40,295 INFO L93 Difference]: Finished difference Result 110 states and 118 transitions. [2021-01-06 17:01:40,295 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2021-01-06 17:01:40,295 INFO L78 Accepts]: Start accepts. Automaton has 41 states. Word has length 80 [2021-01-06 17:01:40,296 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 17:01:40,296 INFO L225 Difference]: With dead ends: 110 [2021-01-06 17:01:40,297 INFO L226 Difference]: Without dead ends: 88 [2021-01-06 17:01:40,298 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 128 GetRequests, 75 SyntacticMatches, 5 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 81 ImplicationChecksByTransitivity, 5.8s TimeCoverageRelationStatistics Valid=281, Invalid=2169, Unknown=0, NotChecked=0, Total=2450 [2021-01-06 17:01:40,299 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2021-01-06 17:01:40,305 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 86. [2021-01-06 17:01:40,305 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 86 states. [2021-01-06 17:01:40,306 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 86 states to 86 states and 88 transitions. [2021-01-06 17:01:40,306 INFO L78 Accepts]: Start accepts. Automaton has 86 states and 88 transitions. Word has length 80 [2021-01-06 17:01:40,307 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 17:01:40,307 INFO L481 AbstractCegarLoop]: Abstraction has 86 states and 88 transitions. [2021-01-06 17:01:40,307 INFO L482 AbstractCegarLoop]: Interpolant automaton has 41 states. [2021-01-06 17:01:40,307 INFO L276 IsEmpty]: Start isEmpty. Operand 86 states and 88 transitions. [2021-01-06 17:01:40,308 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 85 [2021-01-06 17:01:40,308 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 17:01:40,308 INFO L422 BasicCegarLoop]: trace histogram [39, 30, 9, 1, 1, 1, 1, 1, 1] [2021-01-06 17:01:40,513 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31,31 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-01-06 17:01:40,514 INFO L429 AbstractCegarLoop]: === Iteration 33 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 17:01:40,514 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 17:01:40,515 INFO L82 PathProgramCache]: Analyzing trace with hash 1738844952, now seen corresponding path program 28 times [2021-01-06 17:01:40,515 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 17:01:40,515 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [884634851] [2021-01-06 17:01:40,515 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 17:01:40,547 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 17:01:41,958 INFO L134 CoverageAnalysis]: Checked inductivity of 1521 backedges. 527 proven. 930 refuted. 0 times theorem prover too weak. 64 trivial. 0 not checked. [2021-01-06 17:01:41,959 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [884634851] [2021-01-06 17:01:41,959 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [248048838] [2021-01-06 17:01:41,959 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 32 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 32 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-01-06 17:01:42,029 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-01-06 17:01:42,029 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-01-06 17:01:42,031 INFO L263 TraceCheckSpWp]: Trace formula consists of 197 conjuncts, 64 conjunts are in the unsatisfiable core [2021-01-06 17:01:42,032 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-01-06 17:01:42,311 INFO L134 CoverageAnalysis]: Checked inductivity of 1521 backedges. 527 proven. 930 refuted. 0 times theorem prover too weak. 64 trivial. 0 not checked. [2021-01-06 17:01:42,311 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-01-06 17:01:42,311 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 33] total 34 [2021-01-06 17:01:42,312 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1869672389] [2021-01-06 17:01:42,312 INFO L461 AbstractCegarLoop]: Interpolant automaton has 34 states [2021-01-06 17:01:42,312 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 17:01:42,313 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2021-01-06 17:01:42,313 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=96, Invalid=1026, Unknown=0, NotChecked=0, Total=1122 [2021-01-06 17:01:42,313 INFO L87 Difference]: Start difference. First operand 86 states and 88 transitions. Second operand 34 states. [2021-01-06 17:01:44,241 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 17:01:44,242 INFO L93 Difference]: Finished difference Result 112 states and 117 transitions. [2021-01-06 17:01:44,243 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2021-01-06 17:01:44,243 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 84 [2021-01-06 17:01:44,244 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 17:01:44,244 INFO L225 Difference]: With dead ends: 112 [2021-01-06 17:01:44,244 INFO L226 Difference]: Without dead ends: 88 [2021-01-06 17:01:44,246 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 117 GetRequests, 82 SyntacticMatches, 3 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=96, Invalid=1026, Unknown=0, NotChecked=0, Total=1122 [2021-01-06 17:01:44,246 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2021-01-06 17:01:44,252 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 88. [2021-01-06 17:01:44,253 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 88 states. [2021-01-06 17:01:44,253 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 88 states to 88 states and 90 transitions. [2021-01-06 17:01:44,253 INFO L78 Accepts]: Start accepts. Automaton has 88 states and 90 transitions. Word has length 84 [2021-01-06 17:01:44,254 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 17:01:44,254 INFO L481 AbstractCegarLoop]: Abstraction has 88 states and 90 transitions. [2021-01-06 17:01:44,254 INFO L482 AbstractCegarLoop]: Interpolant automaton has 34 states. [2021-01-06 17:01:44,254 INFO L276 IsEmpty]: Start isEmpty. Operand 88 states and 90 transitions. [2021-01-06 17:01:44,255 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2021-01-06 17:01:44,255 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 17:01:44,255 INFO L422 BasicCegarLoop]: trace histogram [40, 31, 9, 1, 1, 1, 1, 1, 1] [2021-01-06 17:01:44,458 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 32 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable32 [2021-01-06 17:01:44,459 INFO L429 AbstractCegarLoop]: === Iteration 34 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 17:01:44,459 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 17:01:44,460 INFO L82 PathProgramCache]: Analyzing trace with hash 2145348859, now seen corresponding path program 29 times [2021-01-06 17:01:44,460 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 17:01:44,460 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [211225715] [2021-01-06 17:01:44,460 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 17:01:44,489 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 17:01:45,907 INFO L134 CoverageAnalysis]: Checked inductivity of 1600 backedges. 544 proven. 992 refuted. 0 times theorem prover too weak. 64 trivial. 0 not checked. [2021-01-06 17:01:45,908 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [211225715] [2021-01-06 17:01:45,908 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [827835815] [2021-01-06 17:01:45,908 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 33 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 33 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-01-06 17:02:07,708 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 41 check-sat command(s) [2021-01-06 17:02:07,708 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-01-06 17:02:07,719 INFO L263 TraceCheckSpWp]: Trace formula consists of 201 conjuncts, 82 conjunts are in the unsatisfiable core [2021-01-06 17:02:07,721 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-01-06 17:02:08,580 INFO L134 CoverageAnalysis]: Checked inductivity of 1600 backedges. 190 proven. 1406 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-01-06 17:02:08,581 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-01-06 17:02:08,581 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 40] total 41 [2021-01-06 17:02:08,582 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2073895987] [2021-01-06 17:02:08,583 INFO L461 AbstractCegarLoop]: Interpolant automaton has 41 states [2021-01-06 17:02:08,584 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 17:02:08,584 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2021-01-06 17:02:08,585 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=111, Invalid=1529, Unknown=0, NotChecked=0, Total=1640 [2021-01-06 17:02:08,585 INFO L87 Difference]: Start difference. First operand 88 states and 90 transitions. Second operand 41 states. [2021-01-06 17:02:11,071 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 17:02:11,071 INFO L93 Difference]: Finished difference Result 114 states and 119 transitions. [2021-01-06 17:02:11,072 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2021-01-06 17:02:11,073 INFO L78 Accepts]: Start accepts. Automaton has 41 states. Word has length 86 [2021-01-06 17:02:11,073 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 17:02:11,074 INFO L225 Difference]: With dead ends: 114 [2021-01-06 17:02:11,074 INFO L226 Difference]: Without dead ends: 90 [2021-01-06 17:02:11,074 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 120 GetRequests, 75 SyntacticMatches, 6 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 23 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=111, Invalid=1529, Unknown=0, NotChecked=0, Total=1640 [2021-01-06 17:02:11,075 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 90 states. [2021-01-06 17:02:11,079 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 90 to 90. [2021-01-06 17:02:11,079 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 90 states. [2021-01-06 17:02:11,079 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 90 states to 90 states and 92 transitions. [2021-01-06 17:02:11,080 INFO L78 Accepts]: Start accepts. Automaton has 90 states and 92 transitions. Word has length 86 [2021-01-06 17:02:11,080 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 17:02:11,080 INFO L481 AbstractCegarLoop]: Abstraction has 90 states and 92 transitions. [2021-01-06 17:02:11,080 INFO L482 AbstractCegarLoop]: Interpolant automaton has 41 states. [2021-01-06 17:02:11,080 INFO L276 IsEmpty]: Start isEmpty. Operand 90 states and 92 transitions. [2021-01-06 17:02:11,080 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 89 [2021-01-06 17:02:11,080 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 17:02:11,081 INFO L422 BasicCegarLoop]: trace histogram [41, 32, 9, 1, 1, 1, 1, 1, 1] [2021-01-06 17:02:11,281 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 33 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable33 [2021-01-06 17:02:11,281 INFO L429 AbstractCegarLoop]: === Iteration 35 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 17:02:11,282 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 17:02:11,282 INFO L82 PathProgramCache]: Analyzing trace with hash 1953579550, now seen corresponding path program 30 times [2021-01-06 17:02:11,283 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 17:02:11,283 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1927645486] [2021-01-06 17:02:11,283 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 17:02:11,325 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 17:02:12,807 INFO L134 CoverageAnalysis]: Checked inductivity of 1681 backedges. 561 proven. 1056 refuted. 0 times theorem prover too weak. 64 trivial. 0 not checked. [2021-01-06 17:02:12,808 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1927645486] [2021-01-06 17:02:12,808 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [859271533] [2021-01-06 17:02:12,808 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 34 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 34 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-01-06 17:02:15,531 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 39 check-sat command(s) [2021-01-06 17:02:15,532 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-01-06 17:02:15,536 INFO L263 TraceCheckSpWp]: Trace formula consists of 193 conjuncts, 68 conjunts are in the unsatisfiable core [2021-01-06 17:02:15,538 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-01-06 17:02:19,820 INFO L134 CoverageAnalysis]: Checked inductivity of 1681 backedges. 796 proven. 577 refuted. 0 times theorem prover too weak. 308 trivial. 0 not checked. [2021-01-06 17:02:19,821 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-01-06 17:02:19,821 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 25] total 58 [2021-01-06 17:02:19,821 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [825417652] [2021-01-06 17:02:19,822 INFO L461 AbstractCegarLoop]: Interpolant automaton has 58 states [2021-01-06 17:02:19,822 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 17:02:19,823 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 58 interpolants. [2021-01-06 17:02:19,824 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=658, Invalid=2648, Unknown=0, NotChecked=0, Total=3306 [2021-01-06 17:02:19,824 INFO L87 Difference]: Start difference. First operand 90 states and 92 transitions. Second operand 58 states. [2021-01-06 17:02:27,884 WARN L197 SmtUtils]: Spent 174.00 ms on a formula simplification. DAG size of input: 36 DAG size of output: 12 [2021-01-06 17:02:31,563 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 17:02:31,564 INFO L93 Difference]: Finished difference Result 144 states and 164 transitions. [2021-01-06 17:02:31,564 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 58 states. [2021-01-06 17:02:31,564 INFO L78 Accepts]: Start accepts. Automaton has 58 states. Word has length 88 [2021-01-06 17:02:31,565 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 17:02:31,565 INFO L225 Difference]: With dead ends: 144 [2021-01-06 17:02:31,566 INFO L226 Difference]: Without dead ends: 120 [2021-01-06 17:02:31,568 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 144 GetRequests, 71 SyntacticMatches, 4 SemanticMatches, 69 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 647 ImplicationChecksByTransitivity, 13.5s TimeCoverageRelationStatistics Valid=911, Invalid=4059, Unknown=0, NotChecked=0, Total=4970 [2021-01-06 17:02:31,569 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 120 states. [2021-01-06 17:02:31,582 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 120 to 94. [2021-01-06 17:02:31,582 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 94 states. [2021-01-06 17:02:31,583 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 94 states to 94 states and 96 transitions. [2021-01-06 17:02:31,583 INFO L78 Accepts]: Start accepts. Automaton has 94 states and 96 transitions. Word has length 88 [2021-01-06 17:02:31,583 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 17:02:31,583 INFO L481 AbstractCegarLoop]: Abstraction has 94 states and 96 transitions. [2021-01-06 17:02:31,583 INFO L482 AbstractCegarLoop]: Interpolant automaton has 58 states. [2021-01-06 17:02:31,583 INFO L276 IsEmpty]: Start isEmpty. Operand 94 states and 96 transitions. [2021-01-06 17:02:31,584 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 93 [2021-01-06 17:02:31,584 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 17:02:31,584 INFO L422 BasicCegarLoop]: trace histogram [43, 33, 10, 1, 1, 1, 1, 1, 1] [2021-01-06 17:02:31,791 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 34 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable34 [2021-01-06 17:02:31,791 INFO L429 AbstractCegarLoop]: === Iteration 36 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 17:02:31,792 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 17:02:31,792 INFO L82 PathProgramCache]: Analyzing trace with hash 533862566, now seen corresponding path program 31 times [2021-01-06 17:02:31,792 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 17:02:31,792 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [170948391] [2021-01-06 17:02:31,793 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 17:02:31,818 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 17:02:33,424 INFO L134 CoverageAnalysis]: Checked inductivity of 1849 backedges. 646 proven. 1122 refuted. 0 times theorem prover too weak. 81 trivial. 0 not checked. [2021-01-06 17:02:33,424 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [170948391] [2021-01-06 17:02:33,424 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1397523155] [2021-01-06 17:02:33,425 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 35 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 35 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-01-06 17:02:33,505 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 17:02:33,508 INFO L263 TraceCheckSpWp]: Trace formula consists of 213 conjuncts, 70 conjunts are in the unsatisfiable core [2021-01-06 17:02:33,510 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-01-06 17:02:33,977 INFO L134 CoverageAnalysis]: Checked inductivity of 1849 backedges. 646 proven. 1122 refuted. 0 times theorem prover too weak. 81 trivial. 0 not checked. [2021-01-06 17:02:33,978 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-01-06 17:02:33,978 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36, 36] total 37 [2021-01-06 17:02:33,979 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2094576229] [2021-01-06 17:02:33,979 INFO L461 AbstractCegarLoop]: Interpolant automaton has 37 states [2021-01-06 17:02:33,979 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 17:02:33,980 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2021-01-06 17:02:33,981 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=105, Invalid=1227, Unknown=0, NotChecked=0, Total=1332 [2021-01-06 17:02:33,981 INFO L87 Difference]: Start difference. First operand 94 states and 96 transitions. Second operand 37 states. [2021-01-06 17:02:37,033 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 17:02:37,033 INFO L93 Difference]: Finished difference Result 122 states and 127 transitions. [2021-01-06 17:02:37,035 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2021-01-06 17:02:37,035 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 92 [2021-01-06 17:02:37,036 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 17:02:37,037 INFO L225 Difference]: With dead ends: 122 [2021-01-06 17:02:37,037 INFO L226 Difference]: Without dead ends: 96 [2021-01-06 17:02:37,038 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 128 GetRequests, 90 SyntacticMatches, 3 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=105, Invalid=1227, Unknown=0, NotChecked=0, Total=1332 [2021-01-06 17:02:37,038 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 96 states. [2021-01-06 17:02:37,044 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 96 to 96. [2021-01-06 17:02:37,045 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 96 states. [2021-01-06 17:02:37,045 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 96 states to 96 states and 98 transitions. [2021-01-06 17:02:37,045 INFO L78 Accepts]: Start accepts. Automaton has 96 states and 98 transitions. Word has length 92 [2021-01-06 17:02:37,046 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 17:02:37,046 INFO L481 AbstractCegarLoop]: Abstraction has 96 states and 98 transitions. [2021-01-06 17:02:37,046 INFO L482 AbstractCegarLoop]: Interpolant automaton has 37 states. [2021-01-06 17:02:37,046 INFO L276 IsEmpty]: Start isEmpty. Operand 96 states and 98 transitions. [2021-01-06 17:02:37,046 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 95 [2021-01-06 17:02:37,046 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 17:02:37,046 INFO L422 BasicCegarLoop]: trace histogram [44, 34, 10, 1, 1, 1, 1, 1, 1] [2021-01-06 17:02:37,247 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 35 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable35 [2021-01-06 17:02:37,248 INFO L429 AbstractCegarLoop]: === Iteration 37 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 17:02:37,248 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 17:02:37,249 INFO L82 PathProgramCache]: Analyzing trace with hash 1852458889, now seen corresponding path program 32 times [2021-01-06 17:02:37,249 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 17:02:37,249 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1991781230] [2021-01-06 17:02:37,250 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 17:02:37,279 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 17:02:39,170 INFO L134 CoverageAnalysis]: Checked inductivity of 1936 backedges. 665 proven. 1190 refuted. 0 times theorem prover too weak. 81 trivial. 0 not checked. [2021-01-06 17:02:39,171 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1991781230] [2021-01-06 17:02:39,171 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [984758612] [2021-01-06 17:02:39,171 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 36 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 36 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-01-06 17:02:39,247 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-01-06 17:02:39,248 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-01-06 17:02:39,251 INFO L263 TraceCheckSpWp]: Trace formula consists of 217 conjuncts, 91 conjunts are in the unsatisfiable core [2021-01-06 17:02:39,253 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-01-06 17:02:40,625 INFO L134 CoverageAnalysis]: Checked inductivity of 1936 backedges. 0 proven. 1936 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-01-06 17:02:40,626 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-01-06 17:02:40,626 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37, 47] total 48 [2021-01-06 17:02:40,626 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1153462789] [2021-01-06 17:02:40,627 INFO L461 AbstractCegarLoop]: Interpolant automaton has 48 states [2021-01-06 17:02:40,627 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 17:02:40,627 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2021-01-06 17:02:40,628 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=128, Invalid=2128, Unknown=0, NotChecked=0, Total=2256 [2021-01-06 17:02:40,629 INFO L87 Difference]: Start difference. First operand 96 states and 98 transitions. Second operand 48 states. [2021-01-06 17:02:44,209 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 17:02:44,209 INFO L93 Difference]: Finished difference Result 124 states and 129 transitions. [2021-01-06 17:02:44,210 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2021-01-06 17:02:44,211 INFO L78 Accepts]: Start accepts. Automaton has 48 states. Word has length 94 [2021-01-06 17:02:44,211 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 17:02:44,212 INFO L225 Difference]: With dead ends: 124 [2021-01-06 17:02:44,212 INFO L226 Difference]: Without dead ends: 98 [2021-01-06 17:02:44,214 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 131 GetRequests, 83 SyntacticMatches, 2 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 23 ImplicationChecksByTransitivity, 2.9s TimeCoverageRelationStatistics Valid=128, Invalid=2128, Unknown=0, NotChecked=0, Total=2256 [2021-01-06 17:02:44,214 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 98 states. [2021-01-06 17:02:44,221 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 98 to 98. [2021-01-06 17:02:44,222 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 98 states. [2021-01-06 17:02:44,223 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 98 states to 98 states and 100 transitions. [2021-01-06 17:02:44,223 INFO L78 Accepts]: Start accepts. Automaton has 98 states and 100 transitions. Word has length 94 [2021-01-06 17:02:44,223 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 17:02:44,223 INFO L481 AbstractCegarLoop]: Abstraction has 98 states and 100 transitions. [2021-01-06 17:02:44,223 INFO L482 AbstractCegarLoop]: Interpolant automaton has 48 states. [2021-01-06 17:02:44,223 INFO L276 IsEmpty]: Start isEmpty. Operand 98 states and 100 transitions. [2021-01-06 17:02:44,224 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2021-01-06 17:02:44,224 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 17:02:44,224 INFO L422 BasicCegarLoop]: trace histogram [45, 35, 10, 1, 1, 1, 1, 1, 1] [2021-01-06 17:02:44,439 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 36 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable36 [2021-01-06 17:02:44,440 INFO L429 AbstractCegarLoop]: === Iteration 38 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 17:02:44,441 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 17:02:44,441 INFO L82 PathProgramCache]: Analyzing trace with hash 2008172972, now seen corresponding path program 33 times [2021-01-06 17:02:44,441 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 17:02:44,442 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1936914670] [2021-01-06 17:02:44,442 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 17:02:44,470 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 17:02:46,621 INFO L134 CoverageAnalysis]: Checked inductivity of 2025 backedges. 684 proven. 1260 refuted. 0 times theorem prover too weak. 81 trivial. 0 not checked. [2021-01-06 17:02:46,622 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1936914670] [2021-01-06 17:02:46,622 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1451709789] [2021-01-06 17:02:46,622 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 37 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 37 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-01-06 17:02:47,244 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 22 check-sat command(s) [2021-01-06 17:02:47,244 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-01-06 17:02:47,246 INFO L263 TraceCheckSpWp]: Trace formula consists of 125 conjuncts, 30 conjunts are in the unsatisfiable core [2021-01-06 17:02:47,247 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-01-06 17:02:50,220 INFO L134 CoverageAnalysis]: Checked inductivity of 2025 backedges. 735 proven. 100 refuted. 0 times theorem prover too weak. 1190 trivial. 0 not checked. [2021-01-06 17:02:50,220 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-01-06 17:02:50,220 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [38, 13] total 49 [2021-01-06 17:02:50,220 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [149357288] [2021-01-06 17:02:50,221 INFO L461 AbstractCegarLoop]: Interpolant automaton has 49 states [2021-01-06 17:02:50,221 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 17:02:50,222 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2021-01-06 17:02:50,223 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=254, Invalid=2098, Unknown=0, NotChecked=0, Total=2352 [2021-01-06 17:02:50,223 INFO L87 Difference]: Start difference. First operand 98 states and 100 transitions. Second operand 49 states. [2021-01-06 17:02:57,135 WARN L197 SmtUtils]: Spent 207.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 12 [2021-01-06 17:02:58,798 WARN L197 SmtUtils]: Spent 170.00 ms on a formula simplification. DAG size of input: 36 DAG size of output: 12 [2021-01-06 17:03:00,279 WARN L197 SmtUtils]: Spent 211.00 ms on a formula simplification. DAG size of input: 36 DAG size of output: 12 [2021-01-06 17:03:04,247 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 17:03:04,248 INFO L93 Difference]: Finished difference Result 130 states and 138 transitions. [2021-01-06 17:03:04,248 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2021-01-06 17:03:04,248 INFO L78 Accepts]: Start accepts. Automaton has 49 states. Word has length 96 [2021-01-06 17:03:04,249 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 17:03:04,249 INFO L225 Difference]: With dead ends: 130 [2021-01-06 17:03:04,250 INFO L226 Difference]: Without dead ends: 104 [2021-01-06 17:03:04,251 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 154 GetRequests, 92 SyntacticMatches, 4 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 114 ImplicationChecksByTransitivity, 13.7s TimeCoverageRelationStatistics Valid=378, Invalid=3162, Unknown=0, NotChecked=0, Total=3540 [2021-01-06 17:03:04,252 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 104 states. [2021-01-06 17:03:04,258 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 104 to 102. [2021-01-06 17:03:04,258 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 102 states. [2021-01-06 17:03:04,258 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 102 states to 102 states and 104 transitions. [2021-01-06 17:03:04,258 INFO L78 Accepts]: Start accepts. Automaton has 102 states and 104 transitions. Word has length 96 [2021-01-06 17:03:04,259 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 17:03:04,259 INFO L481 AbstractCegarLoop]: Abstraction has 102 states and 104 transitions. [2021-01-06 17:03:04,259 INFO L482 AbstractCegarLoop]: Interpolant automaton has 49 states. [2021-01-06 17:03:04,259 INFO L276 IsEmpty]: Start isEmpty. Operand 102 states and 104 transitions. [2021-01-06 17:03:04,259 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 101 [2021-01-06 17:03:04,259 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 17:03:04,259 INFO L422 BasicCegarLoop]: trace histogram [47, 36, 11, 1, 1, 1, 1, 1, 1] [2021-01-06 17:03:04,460 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 37 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable37 [2021-01-06 17:03:04,460 INFO L429 AbstractCegarLoop]: === Iteration 39 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 17:03:04,461 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 17:03:04,461 INFO L82 PathProgramCache]: Analyzing trace with hash -1698225740, now seen corresponding path program 34 times [2021-01-06 17:03:04,461 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 17:03:04,461 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1466197434] [2021-01-06 17:03:04,462 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 17:03:04,490 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 17:03:06,019 INFO L134 CoverageAnalysis]: Checked inductivity of 2209 backedges. 777 proven. 1332 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2021-01-06 17:03:06,019 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1466197434] [2021-01-06 17:03:06,019 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [25130479] [2021-01-06 17:03:06,019 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 38 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 38 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-01-06 17:03:06,094 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-01-06 17:03:06,094 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-01-06 17:03:06,097 INFO L263 TraceCheckSpWp]: Trace formula consists of 229 conjuncts, 76 conjunts are in the unsatisfiable core [2021-01-06 17:03:06,099 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-01-06 17:03:06,416 INFO L134 CoverageAnalysis]: Checked inductivity of 2209 backedges. 777 proven. 1332 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2021-01-06 17:03:06,416 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-01-06 17:03:06,417 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39, 39] total 40 [2021-01-06 17:03:06,417 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [389526569] [2021-01-06 17:03:06,417 INFO L461 AbstractCegarLoop]: Interpolant automaton has 40 states [2021-01-06 17:03:06,417 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 17:03:06,417 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2021-01-06 17:03:06,418 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=114, Invalid=1446, Unknown=0, NotChecked=0, Total=1560 [2021-01-06 17:03:06,418 INFO L87 Difference]: Start difference. First operand 102 states and 104 transitions. Second operand 40 states. [2021-01-06 17:03:09,556 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 17:03:09,557 INFO L93 Difference]: Finished difference Result 132 states and 137 transitions. [2021-01-06 17:03:09,558 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2021-01-06 17:03:09,559 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 100 [2021-01-06 17:03:09,559 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 17:03:09,560 INFO L225 Difference]: With dead ends: 132 [2021-01-06 17:03:09,560 INFO L226 Difference]: Without dead ends: 104 [2021-01-06 17:03:09,561 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 139 GetRequests, 99 SyntacticMatches, 2 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=114, Invalid=1446, Unknown=0, NotChecked=0, Total=1560 [2021-01-06 17:03:09,562 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 104 states. [2021-01-06 17:03:09,569 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 104 to 104. [2021-01-06 17:03:09,569 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 104 states. [2021-01-06 17:03:09,570 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 104 states to 104 states and 106 transitions. [2021-01-06 17:03:09,570 INFO L78 Accepts]: Start accepts. Automaton has 104 states and 106 transitions. Word has length 100 [2021-01-06 17:03:09,571 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 17:03:09,571 INFO L481 AbstractCegarLoop]: Abstraction has 104 states and 106 transitions. [2021-01-06 17:03:09,571 INFO L482 AbstractCegarLoop]: Interpolant automaton has 40 states. [2021-01-06 17:03:09,571 INFO L276 IsEmpty]: Start isEmpty. Operand 104 states and 106 transitions. [2021-01-06 17:03:09,572 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 103 [2021-01-06 17:03:09,572 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 17:03:09,572 INFO L422 BasicCegarLoop]: trace histogram [48, 37, 11, 1, 1, 1, 1, 1, 1] [2021-01-06 17:03:09,772 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 38 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable38 [2021-01-06 17:03:09,773 INFO L429 AbstractCegarLoop]: === Iteration 40 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 17:03:09,773 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 17:03:09,774 INFO L82 PathProgramCache]: Analyzing trace with hash -1778401897, now seen corresponding path program 35 times [2021-01-06 17:03:09,774 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 17:03:09,774 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [768374108] [2021-01-06 17:03:09,775 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 17:03:09,808 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 17:03:12,328 INFO L134 CoverageAnalysis]: Checked inductivity of 2304 backedges. 798 proven. 1406 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2021-01-06 17:03:12,328 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [768374108] [2021-01-06 17:03:12,328 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [378219242] [2021-01-06 17:03:12,328 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 39 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 39 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-01-06 17:04:17,231 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 49 check-sat command(s) [2021-01-06 17:04:17,231 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-01-06 17:04:17,247 WARN L261 TraceCheckSpWp]: Trace formula consists of 233 conjuncts, 126 conjunts are in the unsatisfiable core [2021-01-06 17:04:17,249 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-01-06 17:04:18,981 INFO L134 CoverageAnalysis]: Checked inductivity of 2304 backedges. 798 proven. 1406 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2021-01-06 17:04:18,981 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-01-06 17:04:18,981 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [40, 40] total 41 [2021-01-06 17:04:18,981 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [962663620] [2021-01-06 17:04:18,982 INFO L461 AbstractCegarLoop]: Interpolant automaton has 41 states [2021-01-06 17:04:18,982 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 17:04:18,982 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2021-01-06 17:04:18,983 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=117, Invalid=1523, Unknown=0, NotChecked=0, Total=1640 [2021-01-06 17:04:18,983 INFO L87 Difference]: Start difference. First operand 104 states and 106 transitions. Second operand 41 states. [2021-01-06 17:04:21,671 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 17:04:21,671 INFO L93 Difference]: Finished difference Result 134 states and 139 transitions. [2021-01-06 17:04:21,672 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2021-01-06 17:04:21,672 INFO L78 Accepts]: Start accepts. Automaton has 41 states. Word has length 102 [2021-01-06 17:04:21,672 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 17:04:21,673 INFO L225 Difference]: With dead ends: 134 [2021-01-06 17:04:21,673 INFO L226 Difference]: Without dead ends: 106 [2021-01-06 17:04:21,674 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 142 GetRequests, 76 SyntacticMatches, 27 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 50 ImplicationChecksByTransitivity, 3.9s TimeCoverageRelationStatistics Valid=117, Invalid=1523, Unknown=0, NotChecked=0, Total=1640 [2021-01-06 17:04:21,674 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 106 states. [2021-01-06 17:04:21,679 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 106 to 106. [2021-01-06 17:04:21,679 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 106 states. [2021-01-06 17:04:21,679 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 106 states to 106 states and 108 transitions. [2021-01-06 17:04:21,680 INFO L78 Accepts]: Start accepts. Automaton has 106 states and 108 transitions. Word has length 102 [2021-01-06 17:04:21,680 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 17:04:21,680 INFO L481 AbstractCegarLoop]: Abstraction has 106 states and 108 transitions. [2021-01-06 17:04:21,680 INFO L482 AbstractCegarLoop]: Interpolant automaton has 41 states. [2021-01-06 17:04:21,680 INFO L276 IsEmpty]: Start isEmpty. Operand 106 states and 108 transitions. [2021-01-06 17:04:21,681 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 105 [2021-01-06 17:04:21,681 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 17:04:21,681 INFO L422 BasicCegarLoop]: trace histogram [49, 38, 11, 1, 1, 1, 1, 1, 1] [2021-01-06 17:04:21,881 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 39 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable39 [2021-01-06 17:04:21,882 INFO L429 AbstractCegarLoop]: === Iteration 41 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 17:04:21,883 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 17:04:21,883 INFO L82 PathProgramCache]: Analyzing trace with hash -1518277446, now seen corresponding path program 36 times [2021-01-06 17:04:21,884 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 17:04:21,884 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [973353181] [2021-01-06 17:04:21,884 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 17:04:21,918 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 17:04:23,598 INFO L134 CoverageAnalysis]: Checked inductivity of 2401 backedges. 819 proven. 1482 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2021-01-06 17:04:23,598 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [973353181] [2021-01-06 17:04:23,599 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [813903868] [2021-01-06 17:04:23,599 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 40 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 40 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-01-06 17:04:27,294 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 47 check-sat command(s) [2021-01-06 17:04:27,294 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-01-06 17:04:27,297 INFO L263 TraceCheckSpWp]: Trace formula consists of 225 conjuncts, 38 conjunts are in the unsatisfiable core [2021-01-06 17:04:27,299 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-01-06 17:04:29,578 INFO L134 CoverageAnalysis]: Checked inductivity of 2401 backedges. 874 proven. 121 refuted. 0 times theorem prover too weak. 1406 trivial. 0 not checked. [2021-01-06 17:04:29,578 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-01-06 17:04:29,578 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [41, 14] total 53 [2021-01-06 17:04:29,578 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [192471870] [2021-01-06 17:04:29,579 INFO L461 AbstractCegarLoop]: Interpolant automaton has 53 states [2021-01-06 17:04:29,579 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 17:04:29,580 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2021-01-06 17:04:29,580 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=402, Invalid=2354, Unknown=0, NotChecked=0, Total=2756 [2021-01-06 17:04:29,580 INFO L87 Difference]: Start difference. First operand 106 states and 108 transitions. Second operand 53 states. [2021-01-06 17:04:33,540 WARN L197 SmtUtils]: Spent 176.00 ms on a formula simplification. DAG size of input: 40 DAG size of output: 12 [2021-01-06 17:04:35,115 WARN L197 SmtUtils]: Spent 240.00 ms on a formula simplification. DAG size of input: 44 DAG size of output: 12 [2021-01-06 17:04:37,327 WARN L197 SmtUtils]: Spent 443.00 ms on a formula simplification. DAG size of input: 48 DAG size of output: 12 [2021-01-06 17:04:40,811 WARN L197 SmtUtils]: Spent 336.00 ms on a formula simplification. DAG size of input: 52 DAG size of output: 12