/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data -tc config/AutomizerReach.xml -s config/svcomp-Reach-64bit-Automizer_Default.epf -i ../sv-benchmarks/c/array-examples/standard_copy1_ground-1.i -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-4f750a8 [2020-12-21 21:24:03,421 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-12-21 21:24:03,424 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-12-21 21:24:03,459 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-12-21 21:24:03,460 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-12-21 21:24:03,462 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-12-21 21:24:03,464 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-12-21 21:24:03,467 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-12-21 21:24:03,479 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-12-21 21:24:03,481 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-12-21 21:24:03,482 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-12-21 21:24:03,484 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... 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[2020-12-21 21:24:03,513 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-12-21 21:24:03,514 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-12-21 21:24:03,515 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-12-21 21:24:03,516 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-Reach-64bit-Automizer_Default.epf [2020-12-21 21:24:03,545 INFO L113 SettingsManager]: Loading preferences was successful [2020-12-21 21:24:03,546 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-12-21 21:24:03,547 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-12-21 21:24:03,547 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-12-21 21:24:03,548 INFO L138 SettingsManager]: * Use SBE=true [2020-12-21 21:24:03,548 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-12-21 21:24:03,548 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-12-21 21:24:03,548 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-12-21 21:24:03,549 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-12-21 21:24:03,549 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-12-21 21:24:03,549 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-12-21 21:24:03,549 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-12-21 21:24:03,550 INFO L138 SettingsManager]: * Use constant arrays=true [2020-12-21 21:24:03,550 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-12-21 21:24:03,550 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-12-21 21:24:03,550 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-12-21 21:24:03,550 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-12-21 21:24:03,551 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-12-21 21:24:03,551 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-12-21 21:24:03,551 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-12-21 21:24:03,551 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-12-21 21:24:03,552 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-12-21 21:24:03,552 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-12-21 21:24:03,552 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-12-21 21:24:03,552 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-12-21 21:24:03,552 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release [2020-12-21 21:24:03,997 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-12-21 21:24:04,043 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-12-21 21:24:04,047 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-12-21 21:24:04,049 INFO L271 PluginConnector]: Initializing CDTParser... [2020-12-21 21:24:04,050 INFO L275 PluginConnector]: CDTParser initialized [2020-12-21 21:24:04,051 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/array-examples/standard_copy1_ground-1.i [2020-12-21 21:24:04,137 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/cf594eba0/1cfc2d17f00745d79dcc1749901e4cd1/FLAGa25de984f [2020-12-21 21:24:04,819 INFO L306 CDTParser]: Found 1 translation units. [2020-12-21 21:24:04,820 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/array-examples/standard_copy1_ground-1.i [2020-12-21 21:24:04,828 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/cf594eba0/1cfc2d17f00745d79dcc1749901e4cd1/FLAGa25de984f [2020-12-21 21:24:05,179 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/cf594eba0/1cfc2d17f00745d79dcc1749901e4cd1 [2020-12-21 21:24:05,183 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-12-21 21:24:05,186 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2020-12-21 21:24:05,189 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-12-21 21:24:05,190 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-12-21 21:24:05,194 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-12-21 21:24:05,195 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.12 09:24:05" (1/1) ... [2020-12-21 21:24:05,197 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@59fc5a89 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 09:24:05, skipping insertion in model container [2020-12-21 21:24:05,197 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.12 09:24:05" (1/1) ... [2020-12-21 21:24:05,206 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-12-21 21:24:05,225 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-12-21 21:24:05,396 WARN L226 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/array-examples/standard_copy1_ground-1.i[816,829] [2020-12-21 21:24:05,414 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-12-21 21:24:05,424 INFO L203 MainTranslator]: Completed pre-run [2020-12-21 21:24:05,440 WARN L226 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/array-examples/standard_copy1_ground-1.i[816,829] [2020-12-21 21:24:05,448 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-12-21 21:24:05,467 INFO L208 MainTranslator]: Completed translation [2020-12-21 21:24:05,467 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 09:24:05 WrapperNode [2020-12-21 21:24:05,468 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-12-21 21:24:05,469 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2020-12-21 21:24:05,469 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2020-12-21 21:24:05,469 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2020-12-21 21:24:05,479 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 09:24:05" (1/1) ... [2020-12-21 21:24:05,488 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 09:24:05" (1/1) ... [2020-12-21 21:24:05,512 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2020-12-21 21:24:05,513 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-12-21 21:24:05,513 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-12-21 21:24:05,513 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-12-21 21:24:05,524 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 09:24:05" (1/1) ... [2020-12-21 21:24:05,525 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 09:24:05" (1/1) ... [2020-12-21 21:24:05,527 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 09:24:05" (1/1) ... [2020-12-21 21:24:05,527 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 09:24:05" (1/1) ... [2020-12-21 21:24:05,533 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 09:24:05" (1/1) ... [2020-12-21 21:24:05,538 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 09:24:05" (1/1) ... [2020-12-21 21:24:05,540 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 09:24:05" (1/1) ... [2020-12-21 21:24:05,543 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-12-21 21:24:05,544 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-12-21 21:24:05,544 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-12-21 21:24:05,544 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-12-21 21:24:05,546 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 09:24:05" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-12-21 21:24:05,657 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2020-12-21 21:24:05,657 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-12-21 21:24:05,658 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-12-21 21:24:05,658 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-12-21 21:24:05,658 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-12-21 21:24:05,658 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-12-21 21:24:05,658 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-12-21 21:24:05,938 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-12-21 21:24:05,938 INFO L299 CfgBuilder]: Removed 9 assume(true) statements. [2020-12-21 21:24:05,940 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.12 09:24:05 BoogieIcfgContainer [2020-12-21 21:24:05,940 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-12-21 21:24:05,942 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-12-21 21:24:05,943 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-12-21 21:24:05,946 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-12-21 21:24:05,947 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.12 09:24:05" (1/3) ... [2020-12-21 21:24:05,948 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@750f7c9d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.12 09:24:05, skipping insertion in model container [2020-12-21 21:24:05,948 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 09:24:05" (2/3) ... [2020-12-21 21:24:05,949 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@750f7c9d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.12 09:24:05, skipping insertion in model container [2020-12-21 21:24:05,949 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.12 09:24:05" (3/3) ... [2020-12-21 21:24:05,950 INFO L111 eAbstractionObserver]: Analyzing ICFG standard_copy1_ground-1.i [2020-12-21 21:24:05,958 INFO L153 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2020-12-21 21:24:05,963 INFO L165 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-12-21 21:24:05,989 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-12-21 21:24:06,022 INFO L377 AbstractCegarLoop]: Interprodecural is true [2020-12-21 21:24:06,023 INFO L378 AbstractCegarLoop]: Hoare is true [2020-12-21 21:24:06,023 INFO L379 AbstractCegarLoop]: Compute interpolants for FPandBP [2020-12-21 21:24:06,023 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-12-21 21:24:06,023 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-12-21 21:24:06,024 INFO L382 AbstractCegarLoop]: Difference is false [2020-12-21 21:24:06,024 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-12-21 21:24:06,024 INFO L387 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-12-21 21:24:06,115 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states. [2020-12-21 21:24:06,134 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2020-12-21 21:24:06,135 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:24:06,136 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:24:06,136 INFO L429 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:24:06,143 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:24:06,143 INFO L82 PathProgramCache]: Analyzing trace with hash -2016449835, now seen corresponding path program 1 times [2020-12-21 21:24:06,153 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:24:06,153 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1839198623] [2020-12-21 21:24:06,154 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:24:06,299 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:24:06,420 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-21 21:24:06,422 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1839198623] [2020-12-21 21:24:06,424 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-12-21 21:24:06,424 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-12-21 21:24:06,425 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1812168847] [2020-12-21 21:24:06,431 INFO L461 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-12-21 21:24:06,431 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:24:06,455 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-12-21 21:24:06,457 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-12-21 21:24:06,459 INFO L87 Difference]: Start difference. First operand 18 states. Second operand 3 states. [2020-12-21 21:24:06,514 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:24:06,514 INFO L93 Difference]: Finished difference Result 34 states and 46 transitions. [2020-12-21 21:24:06,515 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-12-21 21:24:06,517 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 9 [2020-12-21 21:24:06,518 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:24:06,546 INFO L225 Difference]: With dead ends: 34 [2020-12-21 21:24:06,548 INFO L226 Difference]: Without dead ends: 16 [2020-12-21 21:24:06,553 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-12-21 21:24:06,575 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2020-12-21 21:24:06,593 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 15. [2020-12-21 21:24:06,595 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2020-12-21 21:24:06,596 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 17 transitions. [2020-12-21 21:24:06,598 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 17 transitions. Word has length 9 [2020-12-21 21:24:06,598 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:24:06,598 INFO L481 AbstractCegarLoop]: Abstraction has 15 states and 17 transitions. [2020-12-21 21:24:06,599 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-12-21 21:24:06,599 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 17 transitions. [2020-12-21 21:24:06,600 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2020-12-21 21:24:06,600 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:24:06,601 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:24:06,601 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-12-21 21:24:06,602 INFO L429 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:24:06,606 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:24:06,607 INFO L82 PathProgramCache]: Analyzing trace with hash 1564645395, now seen corresponding path program 1 times [2020-12-21 21:24:06,607 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:24:06,607 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1079749542] [2020-12-21 21:24:06,607 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:24:06,658 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:24:06,724 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-21 21:24:06,726 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1079749542] [2020-12-21 21:24:06,726 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [208956564] [2020-12-21 21:24:06,727 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:24:06,833 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:24:06,837 INFO L263 TraceCheckSpWp]: Trace formula consists of 65 conjuncts, 2 conjunts are in the unsatisfiable core [2020-12-21 21:24:06,846 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:24:06,885 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-12-21 21:24:06,885 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 1 imperfect interpolant sequences. [2020-12-21 21:24:06,885 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [4] total 5 [2020-12-21 21:24:06,887 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [166190874] [2020-12-21 21:24:06,889 INFO L461 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-12-21 21:24:06,890 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:24:06,893 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-12-21 21:24:06,894 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2020-12-21 21:24:06,894 INFO L87 Difference]: Start difference. First operand 15 states and 17 transitions. Second operand 3 states. [2020-12-21 21:24:06,918 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:24:06,918 INFO L93 Difference]: Finished difference Result 24 states and 27 transitions. [2020-12-21 21:24:06,919 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-12-21 21:24:06,919 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 11 [2020-12-21 21:24:06,920 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:24:06,922 INFO L225 Difference]: With dead ends: 24 [2020-12-21 21:24:06,922 INFO L226 Difference]: Without dead ends: 17 [2020-12-21 21:24:06,924 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 11 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2020-12-21 21:24:06,926 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2020-12-21 21:24:06,932 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 16. [2020-12-21 21:24:06,932 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2020-12-21 21:24:06,935 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 18 transitions. [2020-12-21 21:24:06,935 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 18 transitions. Word has length 11 [2020-12-21 21:24:06,936 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:24:06,936 INFO L481 AbstractCegarLoop]: Abstraction has 16 states and 18 transitions. [2020-12-21 21:24:06,936 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-12-21 21:24:06,936 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 18 transitions. [2020-12-21 21:24:06,939 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-12-21 21:24:06,939 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:24:06,939 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:24:07,155 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1 [2020-12-21 21:24:07,156 INFO L429 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:24:07,157 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:24:07,158 INFO L82 PathProgramCache]: Analyzing trace with hash 2031054225, now seen corresponding path program 1 times [2020-12-21 21:24:07,158 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:24:07,158 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [93245425] [2020-12-21 21:24:07,159 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:24:07,173 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:24:07,199 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-12-21 21:24:07,200 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [93245425] [2020-12-21 21:24:07,200 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1211949750] [2020-12-21 21:24:07,200 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:24:07,265 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:24:07,266 INFO L263 TraceCheckSpWp]: Trace formula consists of 69 conjuncts, 3 conjunts are in the unsatisfiable core [2020-12-21 21:24:07,268 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:24:07,339 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-12-21 21:24:07,339 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:24:07,339 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 5 [2020-12-21 21:24:07,340 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [714101655] [2020-12-21 21:24:07,340 INFO L461 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-12-21 21:24:07,340 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:24:07,341 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-12-21 21:24:07,342 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2020-12-21 21:24:07,342 INFO L87 Difference]: Start difference. First operand 16 states and 18 transitions. Second operand 5 states. [2020-12-21 21:24:07,362 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:24:07,363 INFO L93 Difference]: Finished difference Result 30 states and 34 transitions. [2020-12-21 21:24:07,363 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-12-21 21:24:07,364 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2020-12-21 21:24:07,364 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:24:07,365 INFO L225 Difference]: With dead ends: 30 [2020-12-21 21:24:07,365 INFO L226 Difference]: Without dead ends: 19 [2020-12-21 21:24:07,366 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 13 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2020-12-21 21:24:07,366 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2020-12-21 21:24:07,369 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 18. [2020-12-21 21:24:07,369 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2020-12-21 21:24:07,370 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 20 transitions. [2020-12-21 21:24:07,370 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 20 transitions. Word has length 13 [2020-12-21 21:24:07,370 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:24:07,371 INFO L481 AbstractCegarLoop]: Abstraction has 18 states and 20 transitions. [2020-12-21 21:24:07,371 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-12-21 21:24:07,371 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 20 transitions. [2020-12-21 21:24:07,372 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2020-12-21 21:24:07,372 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:24:07,372 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:24:07,586 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:24:07,587 INFO L429 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:24:07,588 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:24:07,589 INFO L82 PathProgramCache]: Analyzing trace with hash -628241457, now seen corresponding path program 2 times [2020-12-21 21:24:07,589 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:24:07,590 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1438217135] [2020-12-21 21:24:07,590 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:24:07,613 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:24:07,642 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-12-21 21:24:07,643 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1438217135] [2020-12-21 21:24:07,643 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [187168230] [2020-12-21 21:24:07,644 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:24:07,712 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2020-12-21 21:24:07,712 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 21:24:07,713 INFO L263 TraceCheckSpWp]: Trace formula consists of 75 conjuncts, 4 conjunts are in the unsatisfiable core [2020-12-21 21:24:07,715 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:24:07,765 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-12-21 21:24:07,766 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:24:07,766 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 5] total 7 [2020-12-21 21:24:07,766 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1397856065] [2020-12-21 21:24:07,767 INFO L461 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-12-21 21:24:07,767 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:24:07,768 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-12-21 21:24:07,768 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2020-12-21 21:24:07,769 INFO L87 Difference]: Start difference. First operand 18 states and 20 transitions. Second operand 7 states. [2020-12-21 21:24:07,829 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:24:07,829 INFO L93 Difference]: Finished difference Result 35 states and 40 transitions. [2020-12-21 21:24:07,832 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-12-21 21:24:07,833 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 15 [2020-12-21 21:24:07,833 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:24:07,834 INFO L225 Difference]: With dead ends: 35 [2020-12-21 21:24:07,834 INFO L226 Difference]: Without dead ends: 24 [2020-12-21 21:24:07,835 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 13 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2020-12-21 21:24:07,835 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2020-12-21 21:24:07,842 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 22. [2020-12-21 21:24:07,842 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2020-12-21 21:24:07,843 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 24 transitions. [2020-12-21 21:24:07,843 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 24 transitions. Word has length 15 [2020-12-21 21:24:07,844 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:24:07,844 INFO L481 AbstractCegarLoop]: Abstraction has 22 states and 24 transitions. [2020-12-21 21:24:07,846 INFO L482 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-12-21 21:24:07,846 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 24 transitions. [2020-12-21 21:24:07,847 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-12-21 21:24:07,847 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:24:07,847 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:24:08,062 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:24:08,063 INFO L429 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:24:08,064 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:24:08,065 INFO L82 PathProgramCache]: Analyzing trace with hash 1927655819, now seen corresponding path program 3 times [2020-12-21 21:24:08,065 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:24:08,066 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1293414] [2020-12-21 21:24:08,066 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:24:08,120 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:24:08,188 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-12-21 21:24:08,188 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1293414] [2020-12-21 21:24:08,189 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [571317994] [2020-12-21 21:24:08,189 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:24:08,242 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2020-12-21 21:24:08,243 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 21:24:08,244 INFO L263 TraceCheckSpWp]: Trace formula consists of 79 conjuncts, 4 conjunts are in the unsatisfiable core [2020-12-21 21:24:08,246 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:24:08,322 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2020-12-21 21:24:08,323 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:24:08,323 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5] total 9 [2020-12-21 21:24:08,323 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2141558851] [2020-12-21 21:24:08,324 INFO L461 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-12-21 21:24:08,324 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:24:08,325 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-12-21 21:24:08,325 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=48, Unknown=0, NotChecked=0, Total=72 [2020-12-21 21:24:08,326 INFO L87 Difference]: Start difference. First operand 22 states and 24 transitions. Second operand 9 states. [2020-12-21 21:24:08,377 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:24:08,377 INFO L93 Difference]: Finished difference Result 41 states and 46 transitions. [2020-12-21 21:24:08,378 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-12-21 21:24:08,378 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 19 [2020-12-21 21:24:08,379 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:24:08,379 INFO L225 Difference]: With dead ends: 41 [2020-12-21 21:24:08,379 INFO L226 Difference]: Without dead ends: 28 [2020-12-21 21:24:08,380 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 17 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=24, Invalid=48, Unknown=0, NotChecked=0, Total=72 [2020-12-21 21:24:08,381 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2020-12-21 21:24:08,385 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 26. [2020-12-21 21:24:08,385 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-12-21 21:24:08,386 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 28 transitions. [2020-12-21 21:24:08,386 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 28 transitions. Word has length 19 [2020-12-21 21:24:08,386 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:24:08,387 INFO L481 AbstractCegarLoop]: Abstraction has 26 states and 28 transitions. [2020-12-21 21:24:08,387 INFO L482 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-12-21 21:24:08,387 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 28 transitions. [2020-12-21 21:24:08,388 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2020-12-21 21:24:08,388 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:24:08,388 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:24:08,602 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:24:08,603 INFO L429 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:24:08,607 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:24:08,608 INFO L82 PathProgramCache]: Analyzing trace with hash -1088075449, now seen corresponding path program 4 times [2020-12-21 21:24:08,608 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:24:08,608 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1795729545] [2020-12-21 21:24:08,608 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:24:08,656 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:24:08,750 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2020-12-21 21:24:08,751 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1795729545] [2020-12-21 21:24:08,753 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2067865314] [2020-12-21 21:24:08,753 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:24:08,807 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2020-12-21 21:24:08,808 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 21:24:08,809 INFO L263 TraceCheckSpWp]: Trace formula consists of 95 conjuncts, 5 conjunts are in the unsatisfiable core [2020-12-21 21:24:08,811 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:24:08,877 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2020-12-21 21:24:08,878 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:24:08,878 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6] total 11 [2020-12-21 21:24:08,879 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1929524306] [2020-12-21 21:24:08,879 INFO L461 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-12-21 21:24:08,879 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:24:08,880 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-12-21 21:24:08,881 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=75, Unknown=0, NotChecked=0, Total=110 [2020-12-21 21:24:08,881 INFO L87 Difference]: Start difference. First operand 26 states and 28 transitions. Second operand 11 states. [2020-12-21 21:24:08,934 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:24:08,935 INFO L93 Difference]: Finished difference Result 47 states and 52 transitions. [2020-12-21 21:24:08,935 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-12-21 21:24:08,936 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 23 [2020-12-21 21:24:08,936 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:24:08,937 INFO L225 Difference]: With dead ends: 47 [2020-12-21 21:24:08,937 INFO L226 Difference]: Without dead ends: 32 [2020-12-21 21:24:08,938 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=35, Invalid=75, Unknown=0, NotChecked=0, Total=110 [2020-12-21 21:24:08,938 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-12-21 21:24:08,942 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 30. [2020-12-21 21:24:08,942 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-12-21 21:24:08,943 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 32 transitions. [2020-12-21 21:24:08,943 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 32 transitions. Word has length 23 [2020-12-21 21:24:08,944 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:24:08,944 INFO L481 AbstractCegarLoop]: Abstraction has 30 states and 32 transitions. [2020-12-21 21:24:08,944 INFO L482 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-12-21 21:24:08,944 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 32 transitions. [2020-12-21 21:24:08,945 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-12-21 21:24:08,945 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:24:08,945 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:24:09,158 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2020-12-21 21:24:09,159 INFO L429 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:24:09,160 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:24:09,160 INFO L82 PathProgramCache]: Analyzing trace with hash -509111549, now seen corresponding path program 5 times [2020-12-21 21:24:09,161 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:24:09,162 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [832993292] [2020-12-21 21:24:09,162 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:24:09,186 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:24:09,246 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2020-12-21 21:24:09,246 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [832993292] [2020-12-21 21:24:09,247 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [313665970] [2020-12-21 21:24:09,247 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:24:09,437 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2020-12-21 21:24:09,437 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 21:24:09,439 INFO L263 TraceCheckSpWp]: Trace formula consists of 105 conjuncts, 6 conjunts are in the unsatisfiable core [2020-12-21 21:24:09,441 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:24:09,520 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2020-12-21 21:24:09,520 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:24:09,521 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7] total 13 [2020-12-21 21:24:09,521 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [281086387] [2020-12-21 21:24:09,521 INFO L461 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-12-21 21:24:09,522 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:24:09,522 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-12-21 21:24:09,523 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=108, Unknown=0, NotChecked=0, Total=156 [2020-12-21 21:24:09,523 INFO L87 Difference]: Start difference. First operand 30 states and 32 transitions. Second operand 13 states. [2020-12-21 21:24:09,587 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:24:09,588 INFO L93 Difference]: Finished difference Result 53 states and 58 transitions. [2020-12-21 21:24:09,588 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-12-21 21:24:09,589 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 27 [2020-12-21 21:24:09,589 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:24:09,589 INFO L225 Difference]: With dead ends: 53 [2020-12-21 21:24:09,589 INFO L226 Difference]: Without dead ends: 36 [2020-12-21 21:24:09,590 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 23 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=48, Invalid=108, Unknown=0, NotChecked=0, Total=156 [2020-12-21 21:24:09,591 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2020-12-21 21:24:09,595 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 34. [2020-12-21 21:24:09,595 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2020-12-21 21:24:09,596 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 36 transitions. [2020-12-21 21:24:09,597 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 36 transitions. Word has length 27 [2020-12-21 21:24:09,597 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:24:09,597 INFO L481 AbstractCegarLoop]: Abstraction has 34 states and 36 transitions. [2020-12-21 21:24:09,597 INFO L482 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-12-21 21:24:09,597 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 36 transitions. [2020-12-21 21:24:09,598 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2020-12-21 21:24:09,598 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:24:09,599 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:24:09,812 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:24:09,813 INFO L429 AbstractCegarLoop]: === Iteration 8 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:24:09,814 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:24:09,814 INFO L82 PathProgramCache]: Analyzing trace with hash 105352895, now seen corresponding path program 6 times [2020-12-21 21:24:09,815 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:24:09,815 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1911413315] [2020-12-21 21:24:09,815 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:24:09,858 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:24:09,963 INFO L134 CoverageAnalysis]: Checked inductivity of 61 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2020-12-21 21:24:09,964 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1911413315] [2020-12-21 21:24:09,964 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1051912009] [2020-12-21 21:24:09,964 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:24:10,063 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2020-12-21 21:24:10,064 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 21:24:10,065 INFO L263 TraceCheckSpWp]: Trace formula consists of 115 conjuncts, 7 conjunts are in the unsatisfiable core [2020-12-21 21:24:10,068 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:24:10,211 INFO L134 CoverageAnalysis]: Checked inductivity of 61 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2020-12-21 21:24:10,212 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:24:10,212 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8] total 15 [2020-12-21 21:24:10,212 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [813793588] [2020-12-21 21:24:10,213 INFO L461 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-12-21 21:24:10,213 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:24:10,214 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-12-21 21:24:10,214 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=63, Invalid=147, Unknown=0, NotChecked=0, Total=210 [2020-12-21 21:24:10,214 INFO L87 Difference]: Start difference. First operand 34 states and 36 transitions. Second operand 15 states. [2020-12-21 21:24:10,315 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:24:10,315 INFO L93 Difference]: Finished difference Result 59 states and 64 transitions. [2020-12-21 21:24:10,320 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-12-21 21:24:10,320 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 31 [2020-12-21 21:24:10,321 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:24:10,322 INFO L225 Difference]: With dead ends: 59 [2020-12-21 21:24:10,322 INFO L226 Difference]: Without dead ends: 40 [2020-12-21 21:24:10,323 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 26 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 36 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=63, Invalid=147, Unknown=0, NotChecked=0, Total=210 [2020-12-21 21:24:10,323 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2020-12-21 21:24:10,328 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 38. [2020-12-21 21:24:10,328 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2020-12-21 21:24:10,329 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 40 transitions. [2020-12-21 21:24:10,329 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 40 transitions. Word has length 31 [2020-12-21 21:24:10,329 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:24:10,329 INFO L481 AbstractCegarLoop]: Abstraction has 38 states and 40 transitions. [2020-12-21 21:24:10,330 INFO L482 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-12-21 21:24:10,330 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 40 transitions. [2020-12-21 21:24:10,331 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2020-12-21 21:24:10,331 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:24:10,331 INFO L422 BasicCegarLoop]: trace histogram [7, 7, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:24:10,545 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:24:10,546 INFO L429 AbstractCegarLoop]: === Iteration 9 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:24:10,547 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:24:10,547 INFO L82 PathProgramCache]: Analyzing trace with hash -497009541, now seen corresponding path program 7 times [2020-12-21 21:24:10,548 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:24:10,549 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [956995195] [2020-12-21 21:24:10,549 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:24:10,572 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:24:10,656 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 0 proven. 49 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2020-12-21 21:24:10,657 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [956995195] [2020-12-21 21:24:10,662 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [303004518] [2020-12-21 21:24:10,665 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:24:10,733 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:24:10,735 INFO L263 TraceCheckSpWp]: Trace formula consists of 125 conjuncts, 9 conjunts are in the unsatisfiable core [2020-12-21 21:24:10,737 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:24:10,826 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 0 proven. 49 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2020-12-21 21:24:10,827 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:24:10,827 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10] total 11 [2020-12-21 21:24:10,830 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [287989405] [2020-12-21 21:24:10,830 INFO L461 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-12-21 21:24:10,830 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:24:10,831 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-12-21 21:24:10,831 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=55, Unknown=0, NotChecked=0, Total=110 [2020-12-21 21:24:10,831 INFO L87 Difference]: Start difference. First operand 38 states and 40 transitions. Second operand 11 states. [2020-12-21 21:24:10,891 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:24:10,892 INFO L93 Difference]: Finished difference Result 62 states and 66 transitions. [2020-12-21 21:24:10,892 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-12-21 21:24:10,892 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 35 [2020-12-21 21:24:10,893 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:24:10,895 INFO L225 Difference]: With dead ends: 62 [2020-12-21 21:24:10,896 INFO L226 Difference]: Without dead ends: 41 [2020-12-21 21:24:10,897 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 35 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=55, Invalid=55, Unknown=0, NotChecked=0, Total=110 [2020-12-21 21:24:10,898 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2020-12-21 21:24:10,909 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 40. [2020-12-21 21:24:10,910 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2020-12-21 21:24:10,913 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 42 transitions. [2020-12-21 21:24:10,913 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 42 transitions. Word has length 35 [2020-12-21 21:24:10,915 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:24:10,916 INFO L481 AbstractCegarLoop]: Abstraction has 40 states and 42 transitions. [2020-12-21 21:24:10,916 INFO L482 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-12-21 21:24:10,916 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 42 transitions. [2020-12-21 21:24:10,918 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2020-12-21 21:24:10,918 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:24:10,918 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:24:11,131 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable8 [2020-12-21 21:24:11,132 INFO L429 AbstractCegarLoop]: === Iteration 10 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:24:11,133 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:24:11,133 INFO L82 PathProgramCache]: Analyzing trace with hash 531052601, now seen corresponding path program 8 times [2020-12-21 21:24:11,134 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:24:11,134 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [281781387] [2020-12-21 21:24:11,135 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:24:11,164 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:24:11,272 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2020-12-21 21:24:11,273 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [281781387] [2020-12-21 21:24:11,277 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1252273367] [2020-12-21 21:24:11,278 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:24:11,344 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2020-12-21 21:24:11,344 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 21:24:11,345 INFO L263 TraceCheckSpWp]: Trace formula consists of 131 conjuncts, 10 conjunts are in the unsatisfiable core [2020-12-21 21:24:11,348 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:24:11,432 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2020-12-21 21:24:11,432 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:24:11,432 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 12 [2020-12-21 21:24:11,433 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1022101159] [2020-12-21 21:24:11,434 INFO L461 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-12-21 21:24:11,435 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:24:11,435 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-12-21 21:24:11,440 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=66, Invalid=66, Unknown=0, NotChecked=0, Total=132 [2020-12-21 21:24:11,441 INFO L87 Difference]: Start difference. First operand 40 states and 42 transitions. Second operand 12 states. [2020-12-21 21:24:11,483 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:24:11,483 INFO L93 Difference]: Finished difference Result 64 states and 68 transitions. [2020-12-21 21:24:11,484 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-12-21 21:24:11,484 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 37 [2020-12-21 21:24:11,485 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:24:11,488 INFO L225 Difference]: With dead ends: 64 [2020-12-21 21:24:11,488 INFO L226 Difference]: Without dead ends: 43 [2020-12-21 21:24:11,489 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 37 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=66, Invalid=66, Unknown=0, NotChecked=0, Total=132 [2020-12-21 21:24:11,490 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2020-12-21 21:24:11,504 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 42. [2020-12-21 21:24:11,505 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2020-12-21 21:24:11,507 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 44 transitions. [2020-12-21 21:24:11,507 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 44 transitions. Word has length 37 [2020-12-21 21:24:11,507 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:24:11,507 INFO L481 AbstractCegarLoop]: Abstraction has 42 states and 44 transitions. [2020-12-21 21:24:11,507 INFO L482 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-12-21 21:24:11,507 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 44 transitions. [2020-12-21 21:24:11,511 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2020-12-21 21:24:11,511 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:24:11,511 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:24:11,727 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,10 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:24:11,728 INFO L429 AbstractCegarLoop]: === Iteration 11 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:24:11,729 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:24:11,729 INFO L82 PathProgramCache]: Analyzing trace with hash 656292983, now seen corresponding path program 9 times [2020-12-21 21:24:11,729 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:24:11,730 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1752914800] [2020-12-21 21:24:11,730 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:24:11,750 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:24:11,871 INFO L134 CoverageAnalysis]: Checked inductivity of 117 backedges. 0 proven. 81 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2020-12-21 21:24:11,872 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1752914800] [2020-12-21 21:24:11,872 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [583423951] [2020-12-21 21:24:11,872 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:24:12,010 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 7 check-sat command(s) [2020-12-21 21:24:12,010 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 21:24:12,012 INFO L263 TraceCheckSpWp]: Trace formula consists of 119 conjuncts, 8 conjunts are in the unsatisfiable core [2020-12-21 21:24:12,014 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:24:12,151 INFO L134 CoverageAnalysis]: Checked inductivity of 117 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 81 trivial. 0 not checked. [2020-12-21 21:24:12,152 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:24:12,152 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 9] total 19 [2020-12-21 21:24:12,152 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1162237719] [2020-12-21 21:24:12,153 INFO L461 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-12-21 21:24:12,153 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:24:12,153 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-12-21 21:24:12,154 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=101, Invalid=241, Unknown=0, NotChecked=0, Total=342 [2020-12-21 21:24:12,154 INFO L87 Difference]: Start difference. First operand 42 states and 44 transitions. Second operand 19 states. [2020-12-21 21:24:12,244 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:24:12,245 INFO L93 Difference]: Finished difference Result 69 states and 74 transitions. [2020-12-21 21:24:12,245 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-12-21 21:24:12,245 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 39 [2020-12-21 21:24:12,246 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:24:12,246 INFO L225 Difference]: With dead ends: 69 [2020-12-21 21:24:12,246 INFO L226 Difference]: Without dead ends: 48 [2020-12-21 21:24:12,248 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 33 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 63 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=101, Invalid=241, Unknown=0, NotChecked=0, Total=342 [2020-12-21 21:24:12,248 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2020-12-21 21:24:12,255 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 46. [2020-12-21 21:24:12,255 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-12-21 21:24:12,258 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 48 transitions. [2020-12-21 21:24:12,259 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 48 transitions. Word has length 39 [2020-12-21 21:24:12,259 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:24:12,259 INFO L481 AbstractCegarLoop]: Abstraction has 46 states and 48 transitions. [2020-12-21 21:24:12,259 INFO L482 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-12-21 21:24:12,259 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 48 transitions. [2020-12-21 21:24:12,260 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2020-12-21 21:24:12,260 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:24:12,260 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:24:12,474 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,11 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:24:12,475 INFO L429 AbstractCegarLoop]: === Iteration 12 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:24:12,476 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:24:12,477 INFO L82 PathProgramCache]: Analyzing trace with hash -363708877, now seen corresponding path program 10 times [2020-12-21 21:24:12,477 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:24:12,477 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [431421397] [2020-12-21 21:24:12,477 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:24:12,525 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:24:12,660 INFO L134 CoverageAnalysis]: Checked inductivity of 149 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 49 trivial. 0 not checked. [2020-12-21 21:24:12,661 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [431421397] [2020-12-21 21:24:12,661 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1712593420] [2020-12-21 21:24:12,661 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:24:12,734 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2020-12-21 21:24:12,734 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 21:24:12,736 INFO L263 TraceCheckSpWp]: Trace formula consists of 147 conjuncts, 9 conjunts are in the unsatisfiable core [2020-12-21 21:24:12,738 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:24:12,920 INFO L134 CoverageAnalysis]: Checked inductivity of 149 backedges. 0 proven. 49 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2020-12-21 21:24:12,921 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:24:12,921 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 10] total 21 [2020-12-21 21:24:12,921 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [776964503] [2020-12-21 21:24:12,922 INFO L461 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-12-21 21:24:12,922 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:24:12,922 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-12-21 21:24:12,923 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=122, Invalid=298, Unknown=0, NotChecked=0, Total=420 [2020-12-21 21:24:12,923 INFO L87 Difference]: Start difference. First operand 46 states and 48 transitions. Second operand 21 states. [2020-12-21 21:24:13,025 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:24:13,026 INFO L93 Difference]: Finished difference Result 75 states and 80 transitions. [2020-12-21 21:24:13,026 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-12-21 21:24:13,026 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 43 [2020-12-21 21:24:13,027 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:24:13,027 INFO L225 Difference]: With dead ends: 75 [2020-12-21 21:24:13,027 INFO L226 Difference]: Without dead ends: 52 [2020-12-21 21:24:13,028 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 36 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 80 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=122, Invalid=298, Unknown=0, NotChecked=0, Total=420 [2020-12-21 21:24:13,028 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2020-12-21 21:24:13,031 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 50. [2020-12-21 21:24:13,032 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 50 states. [2020-12-21 21:24:13,032 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 52 transitions. [2020-12-21 21:24:13,032 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 52 transitions. Word has length 43 [2020-12-21 21:24:13,032 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:24:13,033 INFO L481 AbstractCegarLoop]: Abstraction has 50 states and 52 transitions. [2020-12-21 21:24:13,033 INFO L482 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-12-21 21:24:13,033 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 52 transitions. [2020-12-21 21:24:13,033 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2020-12-21 21:24:13,033 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:24:13,034 INFO L422 BasicCegarLoop]: trace histogram [11, 11, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:24:13,249 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2020-12-21 21:24:13,250 INFO L429 AbstractCegarLoop]: === Iteration 13 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:24:13,251 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:24:13,251 INFO L82 PathProgramCache]: Analyzing trace with hash -1684803089, now seen corresponding path program 11 times [2020-12-21 21:24:13,251 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:24:13,251 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1390174380] [2020-12-21 21:24:13,252 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:24:13,278 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:24:13,418 INFO L134 CoverageAnalysis]: Checked inductivity of 185 backedges. 0 proven. 121 refuted. 0 times theorem prover too weak. 64 trivial. 0 not checked. [2020-12-21 21:24:13,419 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1390174380] [2020-12-21 21:24:13,419 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1583998128] [2020-12-21 21:24:13,419 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:24:13,968 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 12 check-sat command(s) [2020-12-21 21:24:13,968 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 21:24:13,971 INFO L263 TraceCheckSpWp]: Trace formula consists of 157 conjuncts, 13 conjunts are in the unsatisfiable core [2020-12-21 21:24:13,973 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:24:14,052 INFO L134 CoverageAnalysis]: Checked inductivity of 185 backedges. 0 proven. 121 refuted. 0 times theorem prover too weak. 64 trivial. 0 not checked. [2020-12-21 21:24:14,053 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:24:14,053 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14] total 15 [2020-12-21 21:24:14,055 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [788753829] [2020-12-21 21:24:14,056 INFO L461 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-12-21 21:24:14,056 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:24:14,057 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-12-21 21:24:14,057 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=105, Invalid=105, Unknown=0, NotChecked=0, Total=210 [2020-12-21 21:24:14,058 INFO L87 Difference]: Start difference. First operand 50 states and 52 transitions. Second operand 15 states. [2020-12-21 21:24:14,115 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:24:14,115 INFO L93 Difference]: Finished difference Result 78 states and 82 transitions. [2020-12-21 21:24:14,115 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-12-21 21:24:14,115 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 47 [2020-12-21 21:24:14,118 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:24:14,119 INFO L225 Difference]: With dead ends: 78 [2020-12-21 21:24:14,119 INFO L226 Difference]: Without dead ends: 53 [2020-12-21 21:24:14,120 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 60 GetRequests, 47 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=105, Invalid=105, Unknown=0, NotChecked=0, Total=210 [2020-12-21 21:24:14,121 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2020-12-21 21:24:14,136 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 52. [2020-12-21 21:24:14,136 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 52 states. [2020-12-21 21:24:14,137 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 54 transitions. [2020-12-21 21:24:14,137 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 54 transitions. Word has length 47 [2020-12-21 21:24:14,137 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:24:14,137 INFO L481 AbstractCegarLoop]: Abstraction has 52 states and 54 transitions. [2020-12-21 21:24:14,137 INFO L482 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-12-21 21:24:14,137 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 54 transitions. [2020-12-21 21:24:14,138 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2020-12-21 21:24:14,138 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:24:14,138 INFO L422 BasicCegarLoop]: trace histogram [12, 12, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:24:14,342 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2020-12-21 21:24:14,343 INFO L429 AbstractCegarLoop]: === Iteration 14 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:24:14,343 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:24:14,344 INFO L82 PathProgramCache]: Analyzing trace with hash -1669775187, now seen corresponding path program 12 times [2020-12-21 21:24:14,344 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:24:14,344 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [712669587] [2020-12-21 21:24:14,345 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:24:14,366 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:24:14,510 INFO L134 CoverageAnalysis]: Checked inductivity of 208 backedges. 0 proven. 144 refuted. 0 times theorem prover too weak. 64 trivial. 0 not checked. [2020-12-21 21:24:14,511 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [712669587] [2020-12-21 21:24:14,511 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [434429108] [2020-12-21 21:24:14,511 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:24:15,453 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 13 check-sat command(s) [2020-12-21 21:24:15,453 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 21:24:15,457 INFO L263 TraceCheckSpWp]: Trace formula consists of 163 conjuncts, 10 conjunts are in the unsatisfiable core [2020-12-21 21:24:15,460 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:24:15,672 INFO L134 CoverageAnalysis]: Checked inductivity of 208 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2020-12-21 21:24:15,672 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:24:15,673 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 11] total 24 [2020-12-21 21:24:15,673 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1151367992] [2020-12-21 21:24:15,673 INFO L461 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-12-21 21:24:15,674 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:24:15,674 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-12-21 21:24:15,675 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=159, Invalid=393, Unknown=0, NotChecked=0, Total=552 [2020-12-21 21:24:15,675 INFO L87 Difference]: Start difference. First operand 52 states and 54 transitions. Second operand 24 states. [2020-12-21 21:24:15,774 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:24:15,775 INFO L93 Difference]: Finished difference Result 83 states and 88 transitions. [2020-12-21 21:24:15,775 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2020-12-21 21:24:15,775 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 49 [2020-12-21 21:24:15,776 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:24:15,776 INFO L225 Difference]: With dead ends: 83 [2020-12-21 21:24:15,776 INFO L226 Difference]: Without dead ends: 58 [2020-12-21 21:24:15,777 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 63 GetRequests, 41 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 108 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=159, Invalid=393, Unknown=0, NotChecked=0, Total=552 [2020-12-21 21:24:15,778 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2020-12-21 21:24:15,781 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 56. [2020-12-21 21:24:15,781 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2020-12-21 21:24:15,781 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 58 transitions. [2020-12-21 21:24:15,781 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 58 transitions. Word has length 49 [2020-12-21 21:24:15,782 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:24:15,782 INFO L481 AbstractCegarLoop]: Abstraction has 56 states and 58 transitions. [2020-12-21 21:24:15,782 INFO L482 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-12-21 21:24:15,782 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 58 transitions. [2020-12-21 21:24:15,782 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2020-12-21 21:24:15,782 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:24:15,783 INFO L422 BasicCegarLoop]: trace histogram [13, 13, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:24:15,997 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2020-12-21 21:24:15,998 INFO L429 AbstractCegarLoop]: === Iteration 15 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:24:15,998 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:24:15,999 INFO L82 PathProgramCache]: Analyzing trace with hash 557979497, now seen corresponding path program 13 times [2020-12-21 21:24:15,999 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:24:15,999 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [399584588] [2020-12-21 21:24:15,999 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:24:16,023 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:24:16,197 INFO L134 CoverageAnalysis]: Checked inductivity of 250 backedges. 0 proven. 169 refuted. 0 times theorem prover too weak. 81 trivial. 0 not checked. [2020-12-21 21:24:16,198 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [399584588] [2020-12-21 21:24:16,198 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [666953352] [2020-12-21 21:24:16,198 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:24:16,262 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:24:16,264 INFO L263 TraceCheckSpWp]: Trace formula consists of 173 conjuncts, 15 conjunts are in the unsatisfiable core [2020-12-21 21:24:16,273 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:24:16,347 INFO L134 CoverageAnalysis]: Checked inductivity of 250 backedges. 0 proven. 169 refuted. 0 times theorem prover too weak. 81 trivial. 0 not checked. [2020-12-21 21:24:16,348 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:24:16,348 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16] total 17 [2020-12-21 21:24:16,348 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1716070842] [2020-12-21 21:24:16,349 INFO L461 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-12-21 21:24:16,349 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:24:16,350 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-12-21 21:24:16,350 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=136, Invalid=136, Unknown=0, NotChecked=0, Total=272 [2020-12-21 21:24:16,350 INFO L87 Difference]: Start difference. First operand 56 states and 58 transitions. Second operand 17 states. [2020-12-21 21:24:16,414 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:24:16,414 INFO L93 Difference]: Finished difference Result 86 states and 90 transitions. [2020-12-21 21:24:16,415 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-12-21 21:24:16,415 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 53 [2020-12-21 21:24:16,415 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:24:16,416 INFO L225 Difference]: With dead ends: 86 [2020-12-21 21:24:16,416 INFO L226 Difference]: Without dead ends: 59 [2020-12-21 21:24:16,416 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 68 GetRequests, 53 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=136, Invalid=136, Unknown=0, NotChecked=0, Total=272 [2020-12-21 21:24:16,417 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2020-12-21 21:24:16,419 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 58. [2020-12-21 21:24:16,420 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 58 states. [2020-12-21 21:24:16,420 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 60 transitions. [2020-12-21 21:24:16,420 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 60 transitions. Word has length 53 [2020-12-21 21:24:16,421 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:24:16,421 INFO L481 AbstractCegarLoop]: Abstraction has 58 states and 60 transitions. [2020-12-21 21:24:16,421 INFO L482 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-12-21 21:24:16,421 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 60 transitions. [2020-12-21 21:24:16,421 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2020-12-21 21:24:16,421 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:24:16,422 INFO L422 BasicCegarLoop]: trace histogram [14, 14, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:24:16,636 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14,15 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:24:16,637 INFO L429 AbstractCegarLoop]: === Iteration 16 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:24:16,637 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:24:16,638 INFO L82 PathProgramCache]: Analyzing trace with hash -1957371993, now seen corresponding path program 14 times [2020-12-21 21:24:16,638 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:24:16,638 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [805705323] [2020-12-21 21:24:16,638 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:24:16,658 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:24:16,843 INFO L134 CoverageAnalysis]: Checked inductivity of 277 backedges. 0 proven. 196 refuted. 0 times theorem prover too weak. 81 trivial. 0 not checked. [2020-12-21 21:24:16,843 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [805705323] [2020-12-21 21:24:16,843 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [861661246] [2020-12-21 21:24:16,843 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:24:16,919 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2020-12-21 21:24:16,920 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 21:24:16,921 INFO L263 TraceCheckSpWp]: Trace formula consists of 179 conjuncts, 16 conjunts are in the unsatisfiable core [2020-12-21 21:24:16,923 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:24:17,005 INFO L134 CoverageAnalysis]: Checked inductivity of 277 backedges. 0 proven. 196 refuted. 0 times theorem prover too weak. 81 trivial. 0 not checked. [2020-12-21 21:24:17,006 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:24:17,006 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17] total 18 [2020-12-21 21:24:17,006 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1468862553] [2020-12-21 21:24:17,007 INFO L461 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-12-21 21:24:17,007 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:24:17,007 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-12-21 21:24:17,008 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=153, Invalid=153, Unknown=0, NotChecked=0, Total=306 [2020-12-21 21:24:17,008 INFO L87 Difference]: Start difference. First operand 58 states and 60 transitions. Second operand 18 states. [2020-12-21 21:24:17,076 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:24:17,077 INFO L93 Difference]: Finished difference Result 88 states and 92 transitions. [2020-12-21 21:24:17,077 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-12-21 21:24:17,077 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 55 [2020-12-21 21:24:17,080 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:24:17,080 INFO L225 Difference]: With dead ends: 88 [2020-12-21 21:24:17,080 INFO L226 Difference]: Without dead ends: 61 [2020-12-21 21:24:17,081 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 71 GetRequests, 55 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 26 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=153, Invalid=153, Unknown=0, NotChecked=0, Total=306 [2020-12-21 21:24:17,082 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2020-12-21 21:24:17,090 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 60. [2020-12-21 21:24:17,090 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 60 states. [2020-12-21 21:24:17,090 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 62 transitions. [2020-12-21 21:24:17,091 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 62 transitions. Word has length 55 [2020-12-21 21:24:17,092 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:24:17,092 INFO L481 AbstractCegarLoop]: Abstraction has 60 states and 62 transitions. [2020-12-21 21:24:17,092 INFO L482 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-12-21 21:24:17,092 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 62 transitions. [2020-12-21 21:24:17,093 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2020-12-21 21:24:17,093 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:24:17,093 INFO L422 BasicCegarLoop]: trace histogram [15, 15, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:24:17,295 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2020-12-21 21:24:17,296 INFO L429 AbstractCegarLoop]: === Iteration 17 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:24:17,296 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:24:17,297 INFO L82 PathProgramCache]: Analyzing trace with hash -1143566235, now seen corresponding path program 15 times [2020-12-21 21:24:17,297 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:24:17,297 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1644558024] [2020-12-21 21:24:17,298 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:24:17,316 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:24:17,535 INFO L134 CoverageAnalysis]: Checked inductivity of 306 backedges. 0 proven. 225 refuted. 0 times theorem prover too weak. 81 trivial. 0 not checked. [2020-12-21 21:24:17,535 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1644558024] [2020-12-21 21:24:17,536 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [725783198] [2020-12-21 21:24:17,536 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:24:17,865 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2020-12-21 21:24:17,865 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 21:24:17,868 INFO L263 TraceCheckSpWp]: Trace formula consists of 149 conjuncts, 11 conjunts are in the unsatisfiable core [2020-12-21 21:24:17,870 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:24:18,105 INFO L134 CoverageAnalysis]: Checked inductivity of 306 backedges. 0 proven. 81 refuted. 0 times theorem prover too weak. 225 trivial. 0 not checked. [2020-12-21 21:24:18,106 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:24:18,106 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 12] total 28 [2020-12-21 21:24:18,106 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [233827740] [2020-12-21 21:24:18,107 INFO L461 AbstractCegarLoop]: Interpolant automaton has 28 states [2020-12-21 21:24:18,107 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:24:18,108 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2020-12-21 21:24:18,108 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=218, Invalid=538, Unknown=0, NotChecked=0, Total=756 [2020-12-21 21:24:18,108 INFO L87 Difference]: Start difference. First operand 60 states and 62 transitions. Second operand 28 states. [2020-12-21 21:24:18,255 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:24:18,255 INFO L93 Difference]: Finished difference Result 93 states and 98 transitions. [2020-12-21 21:24:18,256 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2020-12-21 21:24:18,256 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 57 [2020-12-21 21:24:18,256 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:24:18,256 INFO L225 Difference]: With dead ends: 93 [2020-12-21 21:24:18,256 INFO L226 Difference]: Without dead ends: 66 [2020-12-21 21:24:18,257 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 74 GetRequests, 48 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 150 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=218, Invalid=538, Unknown=0, NotChecked=0, Total=756 [2020-12-21 21:24:18,258 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2020-12-21 21:24:18,260 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 64. [2020-12-21 21:24:18,261 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 64 states. [2020-12-21 21:24:18,261 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 66 transitions. [2020-12-21 21:24:18,261 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 66 transitions. Word has length 57 [2020-12-21 21:24:18,261 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:24:18,262 INFO L481 AbstractCegarLoop]: Abstraction has 64 states and 66 transitions. [2020-12-21 21:24:18,262 INFO L482 AbstractCegarLoop]: Interpolant automaton has 28 states. [2020-12-21 21:24:18,262 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 66 transitions. [2020-12-21 21:24:18,262 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2020-12-21 21:24:18,262 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:24:18,263 INFO L422 BasicCegarLoop]: trace histogram [16, 16, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:24:18,476 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2020-12-21 21:24:18,477 INFO L429 AbstractCegarLoop]: === Iteration 18 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:24:18,477 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:24:18,478 INFO L82 PathProgramCache]: Analyzing trace with hash 1160100641, now seen corresponding path program 16 times [2020-12-21 21:24:18,478 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:24:18,478 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1416212540] [2020-12-21 21:24:18,479 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:24:18,497 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:24:18,712 INFO L134 CoverageAnalysis]: Checked inductivity of 356 backedges. 0 proven. 256 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2020-12-21 21:24:18,712 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1416212540] [2020-12-21 21:24:18,712 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [765687649] [2020-12-21 21:24:18,712 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:24:18,779 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2020-12-21 21:24:18,779 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 21:24:18,780 INFO L263 TraceCheckSpWp]: Trace formula consists of 195 conjuncts, 18 conjunts are in the unsatisfiable core [2020-12-21 21:24:18,781 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:24:18,866 INFO L134 CoverageAnalysis]: Checked inductivity of 356 backedges. 0 proven. 256 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2020-12-21 21:24:18,866 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:24:18,867 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19] total 20 [2020-12-21 21:24:18,867 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1274913284] [2020-12-21 21:24:18,868 INFO L461 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-12-21 21:24:18,868 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:24:18,869 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-12-21 21:24:18,869 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=190, Invalid=190, Unknown=0, NotChecked=0, Total=380 [2020-12-21 21:24:18,869 INFO L87 Difference]: Start difference. First operand 64 states and 66 transitions. Second operand 20 states. [2020-12-21 21:24:18,936 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:24:18,937 INFO L93 Difference]: Finished difference Result 96 states and 100 transitions. [2020-12-21 21:24:18,937 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-12-21 21:24:18,937 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 61 [2020-12-21 21:24:18,937 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:24:18,938 INFO L225 Difference]: With dead ends: 96 [2020-12-21 21:24:18,938 INFO L226 Difference]: Without dead ends: 67 [2020-12-21 21:24:18,939 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 79 GetRequests, 61 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=190, Invalid=190, Unknown=0, NotChecked=0, Total=380 [2020-12-21 21:24:18,939 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2020-12-21 21:24:18,942 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 66. [2020-12-21 21:24:18,943 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 66 states. [2020-12-21 21:24:18,943 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 68 transitions. [2020-12-21 21:24:18,943 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 68 transitions. Word has length 61 [2020-12-21 21:24:18,944 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:24:18,944 INFO L481 AbstractCegarLoop]: Abstraction has 66 states and 68 transitions. [2020-12-21 21:24:18,944 INFO L482 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-12-21 21:24:18,944 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 68 transitions. [2020-12-21 21:24:18,944 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2020-12-21 21:24:18,944 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:24:18,945 INFO L422 BasicCegarLoop]: trace histogram [17, 17, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:24:19,146 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2020-12-21 21:24:19,147 INFO L429 AbstractCegarLoop]: === Iteration 19 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:24:19,147 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:24:19,148 INFO L82 PathProgramCache]: Analyzing trace with hash -595368609, now seen corresponding path program 17 times [2020-12-21 21:24:19,148 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:24:19,148 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1559875194] [2020-12-21 21:24:19,149 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:24:19,170 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:24:19,414 INFO L134 CoverageAnalysis]: Checked inductivity of 389 backedges. 0 proven. 289 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2020-12-21 21:24:19,414 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1559875194] [2020-12-21 21:24:19,414 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [736296443] [2020-12-21 21:24:19,414 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:24:24,143 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 18 check-sat command(s) [2020-12-21 21:24:24,144 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 21:24:24,156 INFO L263 TraceCheckSpWp]: Trace formula consists of 201 conjuncts, 19 conjunts are in the unsatisfiable core [2020-12-21 21:24:24,157 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:24:24,273 INFO L134 CoverageAnalysis]: Checked inductivity of 389 backedges. 0 proven. 289 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2020-12-21 21:24:24,273 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:24:24,275 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20] total 21 [2020-12-21 21:24:24,275 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1068836659] [2020-12-21 21:24:24,278 INFO L461 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-12-21 21:24:24,278 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:24:24,279 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-12-21 21:24:24,281 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=210, Invalid=210, Unknown=0, NotChecked=0, Total=420 [2020-12-21 21:24:24,281 INFO L87 Difference]: Start difference. First operand 66 states and 68 transitions. Second operand 21 states. [2020-12-21 21:24:24,357 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:24:24,357 INFO L93 Difference]: Finished difference Result 98 states and 102 transitions. [2020-12-21 21:24:24,357 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2020-12-21 21:24:24,358 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 63 [2020-12-21 21:24:24,358 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:24:24,358 INFO L225 Difference]: With dead ends: 98 [2020-12-21 21:24:24,359 INFO L226 Difference]: Without dead ends: 69 [2020-12-21 21:24:24,360 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 63 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=210, Invalid=210, Unknown=0, NotChecked=0, Total=420 [2020-12-21 21:24:24,360 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2020-12-21 21:24:24,364 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 68. [2020-12-21 21:24:24,365 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 68 states. [2020-12-21 21:24:24,365 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 70 transitions. [2020-12-21 21:24:24,365 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 70 transitions. Word has length 63 [2020-12-21 21:24:24,366 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:24:24,366 INFO L481 AbstractCegarLoop]: Abstraction has 68 states and 70 transitions. [2020-12-21 21:24:24,366 INFO L482 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-12-21 21:24:24,366 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 70 transitions. [2020-12-21 21:24:24,368 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2020-12-21 21:24:24,368 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:24:24,368 INFO L422 BasicCegarLoop]: trace histogram [18, 18, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:24:24,569 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,19 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:24:24,570 INFO L429 AbstractCegarLoop]: === Iteration 20 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:24:24,570 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:24:24,570 INFO L82 PathProgramCache]: Analyzing trace with hash 320829469, now seen corresponding path program 18 times [2020-12-21 21:24:24,571 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:24:24,571 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [634171540] [2020-12-21 21:24:24,571 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:24:24,597 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:24:24,856 INFO L134 CoverageAnalysis]: Checked inductivity of 424 backedges. 0 proven. 324 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2020-12-21 21:24:24,857 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [634171540] [2020-12-21 21:24:24,857 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1089745753] [2020-12-21 21:24:24,857 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:24:27,896 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 19 check-sat command(s) [2020-12-21 21:24:27,898 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 21:24:27,909 INFO L263 TraceCheckSpWp]: Trace formula consists of 207 conjuncts, 12 conjunts are in the unsatisfiable core [2020-12-21 21:24:27,911 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:24:28,194 INFO L134 CoverageAnalysis]: Checked inductivity of 424 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 324 trivial. 0 not checked. [2020-12-21 21:24:28,195 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:24:28,195 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 13] total 32 [2020-12-21 21:24:28,195 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [686967652] [2020-12-21 21:24:28,196 INFO L461 AbstractCegarLoop]: Interpolant automaton has 32 states [2020-12-21 21:24:28,196 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:24:28,196 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2020-12-21 21:24:28,197 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=287, Invalid=705, Unknown=0, NotChecked=0, Total=992 [2020-12-21 21:24:28,197 INFO L87 Difference]: Start difference. First operand 68 states and 70 transitions. Second operand 32 states. [2020-12-21 21:24:28,366 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:24:28,366 INFO L93 Difference]: Finished difference Result 103 states and 108 transitions. [2020-12-21 21:24:28,367 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2020-12-21 21:24:28,367 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 65 [2020-12-21 21:24:28,367 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:24:28,368 INFO L225 Difference]: With dead ends: 103 [2020-12-21 21:24:28,368 INFO L226 Difference]: Without dead ends: 74 [2020-12-21 21:24:28,369 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 85 GetRequests, 55 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 198 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=287, Invalid=705, Unknown=0, NotChecked=0, Total=992 [2020-12-21 21:24:28,370 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 74 states. [2020-12-21 21:24:28,372 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 74 to 72. [2020-12-21 21:24:28,372 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 72 states. [2020-12-21 21:24:28,373 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 74 transitions. [2020-12-21 21:24:28,373 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 74 transitions. Word has length 65 [2020-12-21 21:24:28,373 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:24:28,373 INFO L481 AbstractCegarLoop]: Abstraction has 72 states and 74 transitions. [2020-12-21 21:24:28,373 INFO L482 AbstractCegarLoop]: Interpolant automaton has 32 states. [2020-12-21 21:24:28,374 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 74 transitions. [2020-12-21 21:24:28,374 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2020-12-21 21:24:28,374 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:24:28,374 INFO L422 BasicCegarLoop]: trace histogram [19, 19, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:24:28,588 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,20 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:24:28,589 INFO L429 AbstractCegarLoop]: === Iteration 21 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:24:28,589 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:24:28,590 INFO L82 PathProgramCache]: Analyzing trace with hash -1142098215, now seen corresponding path program 19 times [2020-12-21 21:24:28,590 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:24:28,590 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1362846512] [2020-12-21 21:24:28,590 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:24:28,615 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:24:28,887 INFO L134 CoverageAnalysis]: Checked inductivity of 482 backedges. 0 proven. 361 refuted. 0 times theorem prover too weak. 121 trivial. 0 not checked. [2020-12-21 21:24:28,888 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1362846512] [2020-12-21 21:24:28,888 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1626831071] [2020-12-21 21:24:28,888 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:24:28,992 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:24:28,994 INFO L263 TraceCheckSpWp]: Trace formula consists of 217 conjuncts, 21 conjunts are in the unsatisfiable core [2020-12-21 21:24:28,996 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:24:29,099 INFO L134 CoverageAnalysis]: Checked inductivity of 482 backedges. 0 proven. 361 refuted. 0 times theorem prover too weak. 121 trivial. 0 not checked. [2020-12-21 21:24:29,100 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:24:29,100 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22] total 23 [2020-12-21 21:24:29,100 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1826145158] [2020-12-21 21:24:29,103 INFO L461 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-12-21 21:24:29,103 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:24:29,104 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-12-21 21:24:29,104 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=253, Invalid=253, Unknown=0, NotChecked=0, Total=506 [2020-12-21 21:24:29,105 INFO L87 Difference]: Start difference. First operand 72 states and 74 transitions. Second operand 23 states. [2020-12-21 21:24:29,192 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:24:29,192 INFO L93 Difference]: Finished difference Result 106 states and 110 transitions. [2020-12-21 21:24:29,193 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-12-21 21:24:29,193 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 69 [2020-12-21 21:24:29,193 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:24:29,194 INFO L225 Difference]: With dead ends: 106 [2020-12-21 21:24:29,194 INFO L226 Difference]: Without dead ends: 75 [2020-12-21 21:24:29,195 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 90 GetRequests, 69 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 36 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=253, Invalid=253, Unknown=0, NotChecked=0, Total=506 [2020-12-21 21:24:29,195 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2020-12-21 21:24:29,198 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 74. [2020-12-21 21:24:29,198 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 74 states. [2020-12-21 21:24:29,199 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 74 states to 74 states and 76 transitions. [2020-12-21 21:24:29,199 INFO L78 Accepts]: Start accepts. Automaton has 74 states and 76 transitions. Word has length 69 [2020-12-21 21:24:29,199 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:24:29,199 INFO L481 AbstractCegarLoop]: Abstraction has 74 states and 76 transitions. [2020-12-21 21:24:29,199 INFO L482 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-12-21 21:24:29,200 INFO L276 IsEmpty]: Start isEmpty. Operand 74 states and 76 transitions. [2020-12-21 21:24:29,200 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2020-12-21 21:24:29,200 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:24:29,200 INFO L422 BasicCegarLoop]: trace histogram [20, 20, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:24:29,415 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable20 [2020-12-21 21:24:29,416 INFO L429 AbstractCegarLoop]: === Iteration 22 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:24:29,416 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:24:29,417 INFO L82 PathProgramCache]: Analyzing trace with hash 9667351, now seen corresponding path program 20 times [2020-12-21 21:24:29,417 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:24:29,418 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1263010344] [2020-12-21 21:24:29,418 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:24:29,438 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:24:29,734 INFO L134 CoverageAnalysis]: Checked inductivity of 521 backedges. 0 proven. 400 refuted. 0 times theorem prover too weak. 121 trivial. 0 not checked. [2020-12-21 21:24:29,735 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1263010344] [2020-12-21 21:24:29,735 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [911277139] [2020-12-21 21:24:29,735 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:24:29,812 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2020-12-21 21:24:29,813 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 21:24:29,814 INFO L263 TraceCheckSpWp]: Trace formula consists of 223 conjuncts, 22 conjunts are in the unsatisfiable core [2020-12-21 21:24:29,817 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:24:29,918 INFO L134 CoverageAnalysis]: Checked inductivity of 521 backedges. 0 proven. 400 refuted. 0 times theorem prover too weak. 121 trivial. 0 not checked. [2020-12-21 21:24:29,918 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:24:29,919 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23] total 24 [2020-12-21 21:24:29,919 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [20172143] [2020-12-21 21:24:29,919 INFO L461 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-12-21 21:24:29,919 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:24:29,920 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-12-21 21:24:29,920 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=276, Invalid=276, Unknown=0, NotChecked=0, Total=552 [2020-12-21 21:24:29,921 INFO L87 Difference]: Start difference. First operand 74 states and 76 transitions. Second operand 24 states. [2020-12-21 21:24:30,003 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:24:30,003 INFO L93 Difference]: Finished difference Result 108 states and 112 transitions. [2020-12-21 21:24:30,004 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2020-12-21 21:24:30,004 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 71 [2020-12-21 21:24:30,004 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:24:30,005 INFO L225 Difference]: With dead ends: 108 [2020-12-21 21:24:30,005 INFO L226 Difference]: Without dead ends: 77 [2020-12-21 21:24:30,006 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 93 GetRequests, 71 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 38 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=276, Invalid=276, Unknown=0, NotChecked=0, Total=552 [2020-12-21 21:24:30,006 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 77 states. [2020-12-21 21:24:30,008 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 77 to 76. [2020-12-21 21:24:30,009 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 76 states. [2020-12-21 21:24:30,009 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 78 transitions. [2020-12-21 21:24:30,009 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 78 transitions. Word has length 71 [2020-12-21 21:24:30,010 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:24:30,010 INFO L481 AbstractCegarLoop]: Abstraction has 76 states and 78 transitions. [2020-12-21 21:24:30,010 INFO L482 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-12-21 21:24:30,010 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 78 transitions. [2020-12-21 21:24:30,011 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2020-12-21 21:24:30,011 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:24:30,011 INFO L422 BasicCegarLoop]: trace histogram [21, 21, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:24:30,225 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable21 [2020-12-21 21:24:30,225 INFO L429 AbstractCegarLoop]: === Iteration 23 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:24:30,226 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:24:30,226 INFO L82 PathProgramCache]: Analyzing trace with hash -1245186091, now seen corresponding path program 21 times [2020-12-21 21:24:30,226 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:24:30,227 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [434349050] [2020-12-21 21:24:30,227 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:24:30,247 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:24:30,596 INFO L134 CoverageAnalysis]: Checked inductivity of 562 backedges. 0 proven. 441 refuted. 0 times theorem prover too weak. 121 trivial. 0 not checked. [2020-12-21 21:24:30,597 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [434349050] [2020-12-21 21:24:30,597 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1759562994] [2020-12-21 21:24:30,597 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:24:31,700 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 12 check-sat command(s) [2020-12-21 21:24:31,701 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 21:24:31,705 INFO L263 TraceCheckSpWp]: Trace formula consists of 169 conjuncts, 13 conjunts are in the unsatisfiable core [2020-12-21 21:24:31,707 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:24:32,058 INFO L134 CoverageAnalysis]: Checked inductivity of 562 backedges. 0 proven. 121 refuted. 0 times theorem prover too weak. 441 trivial. 0 not checked. [2020-12-21 21:24:32,059 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:24:32,059 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 14] total 36 [2020-12-21 21:24:32,059 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [119040337] [2020-12-21 21:24:32,059 INFO L461 AbstractCegarLoop]: Interpolant automaton has 36 states [2020-12-21 21:24:32,060 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:24:32,060 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2020-12-21 21:24:32,061 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=366, Invalid=894, Unknown=0, NotChecked=0, Total=1260 [2020-12-21 21:24:32,061 INFO L87 Difference]: Start difference. First operand 76 states and 78 transitions. Second operand 36 states. [2020-12-21 21:24:32,224 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:24:32,225 INFO L93 Difference]: Finished difference Result 113 states and 118 transitions. [2020-12-21 21:24:32,225 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2020-12-21 21:24:32,225 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 73 [2020-12-21 21:24:32,225 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:24:32,226 INFO L225 Difference]: With dead ends: 113 [2020-12-21 21:24:32,226 INFO L226 Difference]: Without dead ends: 82 [2020-12-21 21:24:32,227 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 96 GetRequests, 62 SyntacticMatches, 0 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 252 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=366, Invalid=894, Unknown=0, NotChecked=0, Total=1260 [2020-12-21 21:24:32,229 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2020-12-21 21:24:32,231 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 80. [2020-12-21 21:24:32,231 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 80 states. [2020-12-21 21:24:32,232 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 82 transitions. [2020-12-21 21:24:32,232 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 82 transitions. Word has length 73 [2020-12-21 21:24:32,232 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:24:32,232 INFO L481 AbstractCegarLoop]: Abstraction has 80 states and 82 transitions. [2020-12-21 21:24:32,232 INFO L482 AbstractCegarLoop]: Interpolant automaton has 36 states. [2020-12-21 21:24:32,232 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 82 transitions. [2020-12-21 21:24:32,233 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2020-12-21 21:24:32,233 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:24:32,233 INFO L422 BasicCegarLoop]: trace histogram [22, 22, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:24:32,447 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22,23 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:24:32,447 INFO L429 AbstractCegarLoop]: === Iteration 24 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:24:32,448 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:24:32,448 INFO L82 PathProgramCache]: Analyzing trace with hash 772524689, now seen corresponding path program 22 times [2020-12-21 21:24:32,448 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:24:32,448 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [396812717] [2020-12-21 21:24:32,449 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:24:32,470 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:24:32,842 INFO L134 CoverageAnalysis]: Checked inductivity of 628 backedges. 0 proven. 484 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2020-12-21 21:24:32,843 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [396812717] [2020-12-21 21:24:32,844 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [982392888] [2020-12-21 21:24:32,845 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:24:32,922 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2020-12-21 21:24:32,923 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 21:24:32,924 INFO L263 TraceCheckSpWp]: Trace formula consists of 239 conjuncts, 14 conjunts are in the unsatisfiable core [2020-12-21 21:24:32,927 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:24:33,276 INFO L134 CoverageAnalysis]: Checked inductivity of 628 backedges. 0 proven. 144 refuted. 0 times theorem prover too weak. 484 trivial. 0 not checked. [2020-12-21 21:24:33,276 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:24:33,276 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 15] total 38 [2020-12-21 21:24:33,276 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1974715008] [2020-12-21 21:24:33,277 INFO L461 AbstractCegarLoop]: Interpolant automaton has 38 states [2020-12-21 21:24:33,277 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:24:33,277 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2020-12-21 21:24:33,278 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=404, Invalid=1002, Unknown=0, NotChecked=0, Total=1406 [2020-12-21 21:24:33,278 INFO L87 Difference]: Start difference. First operand 80 states and 82 transitions. Second operand 38 states. [2020-12-21 21:24:33,463 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:24:33,463 INFO L93 Difference]: Finished difference Result 119 states and 124 transitions. [2020-12-21 21:24:33,464 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2020-12-21 21:24:33,464 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 77 [2020-12-21 21:24:33,464 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:24:33,465 INFO L225 Difference]: With dead ends: 119 [2020-12-21 21:24:33,465 INFO L226 Difference]: Without dead ends: 86 [2020-12-21 21:24:33,466 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 101 GetRequests, 65 SyntacticMatches, 0 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 286 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=404, Invalid=1002, Unknown=0, NotChecked=0, Total=1406 [2020-12-21 21:24:33,466 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 86 states. [2020-12-21 21:24:33,469 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 86 to 84. [2020-12-21 21:24:33,469 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 84 states. [2020-12-21 21:24:33,469 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 84 states to 84 states and 86 transitions. [2020-12-21 21:24:33,470 INFO L78 Accepts]: Start accepts. Automaton has 84 states and 86 transitions. Word has length 77 [2020-12-21 21:24:33,470 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:24:33,470 INFO L481 AbstractCegarLoop]: Abstraction has 84 states and 86 transitions. [2020-12-21 21:24:33,470 INFO L482 AbstractCegarLoop]: Interpolant automaton has 38 states. [2020-12-21 21:24:33,470 INFO L276 IsEmpty]: Start isEmpty. Operand 84 states and 86 transitions. [2020-12-21 21:24:33,471 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2020-12-21 21:24:33,471 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:24:33,471 INFO L422 BasicCegarLoop]: trace histogram [23, 23, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:24:33,684 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable23 [2020-12-21 21:24:33,684 INFO L429 AbstractCegarLoop]: === Iteration 25 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:24:33,685 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:24:33,685 INFO L82 PathProgramCache]: Analyzing trace with hash -1969172659, now seen corresponding path program 23 times [2020-12-21 21:24:33,685 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:24:33,685 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1727134930] [2020-12-21 21:24:33,686 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:24:33,712 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:24:34,149 INFO L134 CoverageAnalysis]: Checked inductivity of 698 backedges. 0 proven. 529 refuted. 0 times theorem prover too weak. 169 trivial. 0 not checked. [2020-12-21 21:24:34,150 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1727134930] [2020-12-21 21:24:34,150 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1886870701] [2020-12-21 21:24:34,150 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:25:20,202 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 24 check-sat command(s) [2020-12-21 21:25:20,202 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 21:25:20,258 INFO L263 TraceCheckSpWp]: Trace formula consists of 249 conjuncts, 15 conjunts are in the unsatisfiable core [2020-12-21 21:25:20,260 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:25:20,691 INFO L134 CoverageAnalysis]: Checked inductivity of 698 backedges. 0 proven. 169 refuted. 0 times theorem prover too weak. 529 trivial. 0 not checked. [2020-12-21 21:25:20,696 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:25:20,696 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 16] total 40 [2020-12-21 21:25:20,701 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1273969496] [2020-12-21 21:25:20,701 INFO L461 AbstractCegarLoop]: Interpolant automaton has 40 states [2020-12-21 21:25:20,702 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:25:20,702 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2020-12-21 21:25:20,703 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=444, Invalid=1116, Unknown=0, NotChecked=0, Total=1560 [2020-12-21 21:25:20,703 INFO L87 Difference]: Start difference. First operand 84 states and 86 transitions. Second operand 40 states. [2020-12-21 21:25:20,888 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:25:20,888 INFO L93 Difference]: Finished difference Result 125 states and 130 transitions. [2020-12-21 21:25:20,889 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2020-12-21 21:25:20,889 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 81 [2020-12-21 21:25:20,889 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:25:20,890 INFO L225 Difference]: With dead ends: 125 [2020-12-21 21:25:20,890 INFO L226 Difference]: Without dead ends: 90 [2020-12-21 21:25:20,891 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 106 GetRequests, 68 SyntacticMatches, 0 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 322 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=444, Invalid=1116, Unknown=0, NotChecked=0, Total=1560 [2020-12-21 21:25:20,891 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 90 states. [2020-12-21 21:25:20,894 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 90 to 88. [2020-12-21 21:25:20,894 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 88 states. [2020-12-21 21:25:20,894 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 88 states to 88 states and 90 transitions. [2020-12-21 21:25:20,894 INFO L78 Accepts]: Start accepts. Automaton has 88 states and 90 transitions. Word has length 81 [2020-12-21 21:25:20,895 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:25:20,895 INFO L481 AbstractCegarLoop]: Abstraction has 88 states and 90 transitions. [2020-12-21 21:25:20,895 INFO L482 AbstractCegarLoop]: Interpolant automaton has 40 states. [2020-12-21 21:25:20,895 INFO L276 IsEmpty]: Start isEmpty. Operand 88 states and 90 transitions. [2020-12-21 21:25:20,899 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2020-12-21 21:25:20,899 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:25:20,900 INFO L422 BasicCegarLoop]: trace histogram [24, 24, 14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:25:21,100 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24,25 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:25:21,100 INFO L429 AbstractCegarLoop]: === Iteration 26 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:25:21,101 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:25:21,101 INFO L82 PathProgramCache]: Analyzing trace with hash -1289615863, now seen corresponding path program 24 times [2020-12-21 21:25:21,102 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:25:21,102 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1869709505] [2020-12-21 21:25:21,102 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:25:21,126 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:25:21,567 INFO L134 CoverageAnalysis]: Checked inductivity of 772 backedges. 0 proven. 576 refuted. 0 times theorem prover too weak. 196 trivial. 0 not checked. [2020-12-21 21:25:21,567 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1869709505] [2020-12-21 21:25:21,567 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1640939916] [2020-12-21 21:25:21,567 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:25:51,427 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 25 check-sat command(s) [2020-12-21 21:25:51,428 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 21:25:51,468 INFO L263 TraceCheckSpWp]: Trace formula consists of 259 conjuncts, 26 conjunts are in the unsatisfiable core [2020-12-21 21:25:51,469 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:25:51,605 INFO L134 CoverageAnalysis]: Checked inductivity of 772 backedges. 0 proven. 576 refuted. 0 times theorem prover too weak. 196 trivial. 0 not checked. [2020-12-21 21:25:51,606 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:25:51,606 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 27] total 28 [2020-12-21 21:25:51,607 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [284302963] [2020-12-21 21:25:51,607 INFO L461 AbstractCegarLoop]: Interpolant automaton has 28 states [2020-12-21 21:25:51,607 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:25:51,608 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2020-12-21 21:25:51,609 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=378, Invalid=378, Unknown=0, NotChecked=0, Total=756 [2020-12-21 21:25:51,609 INFO L87 Difference]: Start difference. First operand 88 states and 90 transitions. Second operand 28 states. [2020-12-21 21:25:51,705 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:25:51,705 INFO L93 Difference]: Finished difference Result 128 states and 132 transitions. [2020-12-21 21:25:51,705 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2020-12-21 21:25:51,705 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 85 [2020-12-21 21:25:51,706 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:25:51,706 INFO L225 Difference]: With dead ends: 128 [2020-12-21 21:25:51,707 INFO L226 Difference]: Without dead ends: 91 [2020-12-21 21:25:51,707 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 111 GetRequests, 85 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 46 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=378, Invalid=378, Unknown=0, NotChecked=0, Total=756 [2020-12-21 21:25:51,707 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 91 states. [2020-12-21 21:25:51,710 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 91 to 90. [2020-12-21 21:25:51,710 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 90 states. [2020-12-21 21:25:51,711 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 90 states to 90 states and 92 transitions. [2020-12-21 21:25:51,711 INFO L78 Accepts]: Start accepts. Automaton has 90 states and 92 transitions. Word has length 85 [2020-12-21 21:25:51,711 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:25:51,711 INFO L481 AbstractCegarLoop]: Abstraction has 90 states and 92 transitions. [2020-12-21 21:25:51,711 INFO L482 AbstractCegarLoop]: Interpolant automaton has 28 states. [2020-12-21 21:25:51,712 INFO L276 IsEmpty]: Start isEmpty. Operand 90 states and 92 transitions. [2020-12-21 21:25:51,712 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 88 [2020-12-21 21:25:51,712 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:25:51,713 INFO L422 BasicCegarLoop]: trace histogram [25, 25, 14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:25:51,926 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable25 [2020-12-21 21:25:51,927 INFO L429 AbstractCegarLoop]: === Iteration 27 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:25:51,927 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:25:51,927 INFO L82 PathProgramCache]: Analyzing trace with hash 1515476551, now seen corresponding path program 25 times [2020-12-21 21:25:51,928 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:25:51,928 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [605730698] [2020-12-21 21:25:51,928 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:25:51,954 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:25:52,409 INFO L134 CoverageAnalysis]: Checked inductivity of 821 backedges. 0 proven. 625 refuted. 0 times theorem prover too weak. 196 trivial. 0 not checked. [2020-12-21 21:25:52,410 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [605730698] [2020-12-21 21:25:52,410 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1771797044] [2020-12-21 21:25:52,410 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 27 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 27 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:25:52,491 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:25:52,493 INFO L263 TraceCheckSpWp]: Trace formula consists of 265 conjuncts, 27 conjunts are in the unsatisfiable core [2020-12-21 21:25:52,494 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:25:52,621 INFO L134 CoverageAnalysis]: Checked inductivity of 821 backedges. 0 proven. 625 refuted. 0 times theorem prover too weak. 196 trivial. 0 not checked. [2020-12-21 21:25:52,622 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:25:52,622 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 28] total 29 [2020-12-21 21:25:52,622 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1627311472] [2020-12-21 21:25:52,622 INFO L461 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-12-21 21:25:52,623 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:25:52,623 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-12-21 21:25:52,623 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=406, Invalid=406, Unknown=0, NotChecked=0, Total=812 [2020-12-21 21:25:52,624 INFO L87 Difference]: Start difference. First operand 90 states and 92 transitions. Second operand 29 states. [2020-12-21 21:25:52,722 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:25:52,722 INFO L93 Difference]: Finished difference Result 130 states and 134 transitions. [2020-12-21 21:25:52,739 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2020-12-21 21:25:52,740 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 87 [2020-12-21 21:25:52,740 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:25:52,741 INFO L225 Difference]: With dead ends: 130 [2020-12-21 21:25:52,741 INFO L226 Difference]: Without dead ends: 93 [2020-12-21 21:25:52,742 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 114 GetRequests, 87 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 48 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=406, Invalid=406, Unknown=0, NotChecked=0, Total=812 [2020-12-21 21:25:52,742 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 93 states. [2020-12-21 21:25:52,744 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 93 to 92. [2020-12-21 21:25:52,744 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 92 states. [2020-12-21 21:25:52,745 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 92 states to 92 states and 94 transitions. [2020-12-21 21:25:52,745 INFO L78 Accepts]: Start accepts. Automaton has 92 states and 94 transitions. Word has length 87 [2020-12-21 21:25:52,745 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:25:52,745 INFO L481 AbstractCegarLoop]: Abstraction has 92 states and 94 transitions. [2020-12-21 21:25:52,745 INFO L482 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-12-21 21:25:52,745 INFO L276 IsEmpty]: Start isEmpty. Operand 92 states and 94 transitions. [2020-12-21 21:25:52,746 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 90 [2020-12-21 21:25:52,746 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:25:52,746 INFO L422 BasicCegarLoop]: trace histogram [26, 26, 14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:25:52,960 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable26 [2020-12-21 21:25:52,961 INFO L429 AbstractCegarLoop]: === Iteration 28 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:25:52,961 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:25:52,962 INFO L82 PathProgramCache]: Analyzing trace with hash -30175483, now seen corresponding path program 26 times [2020-12-21 21:25:52,962 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:25:52,962 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1311968584] [2020-12-21 21:25:52,962 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:25:52,985 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:25:53,470 INFO L134 CoverageAnalysis]: Checked inductivity of 872 backedges. 0 proven. 676 refuted. 0 times theorem prover too weak. 196 trivial. 0 not checked. [2020-12-21 21:25:53,470 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1311968584] [2020-12-21 21:25:53,470 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [609784229] [2020-12-21 21:25:53,472 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:25:53,569 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2020-12-21 21:25:53,570 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 21:25:53,572 INFO L263 TraceCheckSpWp]: Trace formula consists of 271 conjuncts, 28 conjunts are in the unsatisfiable core [2020-12-21 21:25:53,574 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:25:53,672 INFO L134 CoverageAnalysis]: Checked inductivity of 872 backedges. 0 proven. 676 refuted. 0 times theorem prover too weak. 196 trivial. 0 not checked. [2020-12-21 21:25:53,673 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:25:53,673 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 29] total 30 [2020-12-21 21:25:53,673 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1369027155] [2020-12-21 21:25:53,674 INFO L461 AbstractCegarLoop]: Interpolant automaton has 30 states [2020-12-21 21:25:53,674 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:25:53,674 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2020-12-21 21:25:53,675 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=435, Invalid=435, Unknown=0, NotChecked=0, Total=870 [2020-12-21 21:25:53,675 INFO L87 Difference]: Start difference. First operand 92 states and 94 transitions. Second operand 30 states. [2020-12-21 21:25:53,776 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:25:53,776 INFO L93 Difference]: Finished difference Result 132 states and 136 transitions. [2020-12-21 21:25:53,776 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2020-12-21 21:25:53,777 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 89 [2020-12-21 21:25:53,777 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:25:53,777 INFO L225 Difference]: With dead ends: 132 [2020-12-21 21:25:53,778 INFO L226 Difference]: Without dead ends: 95 [2020-12-21 21:25:53,778 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 117 GetRequests, 89 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 50 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=435, Invalid=435, Unknown=0, NotChecked=0, Total=870 [2020-12-21 21:25:53,779 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 95 states. [2020-12-21 21:25:53,781 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 95 to 94. [2020-12-21 21:25:53,781 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 94 states. [2020-12-21 21:25:53,782 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 94 states to 94 states and 96 transitions. [2020-12-21 21:25:53,782 INFO L78 Accepts]: Start accepts. Automaton has 94 states and 96 transitions. Word has length 89 [2020-12-21 21:25:53,782 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:25:53,782 INFO L481 AbstractCegarLoop]: Abstraction has 94 states and 96 transitions. [2020-12-21 21:25:53,783 INFO L482 AbstractCegarLoop]: Interpolant automaton has 30 states. [2020-12-21 21:25:53,783 INFO L276 IsEmpty]: Start isEmpty. Operand 94 states and 96 transitions. [2020-12-21 21:25:53,784 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 92 [2020-12-21 21:25:53,784 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:25:53,784 INFO L422 BasicCegarLoop]: trace histogram [27, 27, 14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:25:53,997 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable27 [2020-12-21 21:25:53,998 INFO L429 AbstractCegarLoop]: === Iteration 29 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:25:53,998 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:25:53,999 INFO L82 PathProgramCache]: Analyzing trace with hash 656904259, now seen corresponding path program 27 times [2020-12-21 21:25:53,999 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:25:53,999 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1577307744] [2020-12-21 21:25:53,999 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:25:54,023 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:25:54,549 INFO L134 CoverageAnalysis]: Checked inductivity of 925 backedges. 0 proven. 729 refuted. 0 times theorem prover too weak. 196 trivial. 0 not checked. [2020-12-21 21:25:54,549 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1577307744] [2020-12-21 21:25:54,549 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1554136055] [2020-12-21 21:25:54,549 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 29 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 29 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:25:57,507 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 15 check-sat command(s) [2020-12-21 21:25:57,507 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 21:25:57,515 INFO L263 TraceCheckSpWp]: Trace formula consists of 199 conjuncts, 16 conjunts are in the unsatisfiable core [2020-12-21 21:25:57,516 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:25:58,045 INFO L134 CoverageAnalysis]: Checked inductivity of 925 backedges. 0 proven. 196 refuted. 0 times theorem prover too weak. 729 trivial. 0 not checked. [2020-12-21 21:25:58,045 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:25:58,045 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 17] total 45 [2020-12-21 21:25:58,045 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [791902273] [2020-12-21 21:25:58,046 INFO L461 AbstractCegarLoop]: Interpolant automaton has 45 states [2020-12-21 21:25:58,046 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:25:58,046 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2020-12-21 21:25:58,047 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=570, Invalid=1410, Unknown=0, NotChecked=0, Total=1980 [2020-12-21 21:25:58,047 INFO L87 Difference]: Start difference. First operand 94 states and 96 transitions. Second operand 45 states. [2020-12-21 21:25:58,237 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:25:58,238 INFO L93 Difference]: Finished difference Result 137 states and 142 transitions. [2020-12-21 21:25:58,238 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2020-12-21 21:25:58,238 INFO L78 Accepts]: Start accepts. Automaton has 45 states. Word has length 91 [2020-12-21 21:25:58,239 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:25:58,239 INFO L225 Difference]: With dead ends: 137 [2020-12-21 21:25:58,239 INFO L226 Difference]: Without dead ends: 100 [2020-12-21 21:25:58,240 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 120 GetRequests, 77 SyntacticMatches, 0 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 405 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=570, Invalid=1410, Unknown=0, NotChecked=0, Total=1980 [2020-12-21 21:25:58,241 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 100 states. [2020-12-21 21:25:58,243 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 100 to 98. [2020-12-21 21:25:58,243 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 98 states. [2020-12-21 21:25:58,244 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 98 states to 98 states and 100 transitions. [2020-12-21 21:25:58,244 INFO L78 Accepts]: Start accepts. Automaton has 98 states and 100 transitions. Word has length 91 [2020-12-21 21:25:58,244 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:25:58,244 INFO L481 AbstractCegarLoop]: Abstraction has 98 states and 100 transitions. [2020-12-21 21:25:58,244 INFO L482 AbstractCegarLoop]: Interpolant automaton has 45 states. [2020-12-21 21:25:58,244 INFO L276 IsEmpty]: Start isEmpty. Operand 98 states and 100 transitions. [2020-12-21 21:25:58,245 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 96 [2020-12-21 21:25:58,245 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:25:58,245 INFO L422 BasicCegarLoop]: trace histogram [28, 28, 15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:25:58,458 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 29 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable28 [2020-12-21 21:25:58,459 INFO L429 AbstractCegarLoop]: === Iteration 30 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:25:58,459 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:25:58,460 INFO L82 PathProgramCache]: Analyzing trace with hash -32748545, now seen corresponding path program 28 times [2020-12-21 21:25:58,460 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:25:58,460 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1671230330] [2020-12-21 21:25:58,460 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:25:58,485 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:25:59,096 INFO L134 CoverageAnalysis]: Checked inductivity of 1009 backedges. 0 proven. 784 refuted. 0 times theorem prover too weak. 225 trivial. 0 not checked. [2020-12-21 21:25:59,096 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1671230330] [2020-12-21 21:25:59,097 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1010679586] [2020-12-21 21:25:59,097 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:25:59,201 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2020-12-21 21:25:59,201 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 21:25:59,203 INFO L263 TraceCheckSpWp]: Trace formula consists of 287 conjuncts, 17 conjunts are in the unsatisfiable core [2020-12-21 21:25:59,204 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:25:59,811 INFO L134 CoverageAnalysis]: Checked inductivity of 1009 backedges. 0 proven. 225 refuted. 0 times theorem prover too weak. 784 trivial. 0 not checked. [2020-12-21 21:25:59,811 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:25:59,812 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 18] total 47 [2020-12-21 21:25:59,812 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2025883473] [2020-12-21 21:25:59,812 INFO L461 AbstractCegarLoop]: Interpolant automaton has 47 states [2020-12-21 21:25:59,812 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:25:59,812 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2020-12-21 21:25:59,813 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=617, Invalid=1545, Unknown=0, NotChecked=0, Total=2162 [2020-12-21 21:25:59,813 INFO L87 Difference]: Start difference. First operand 98 states and 100 transitions. Second operand 47 states. [2020-12-21 21:26:00,058 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:26:00,058 INFO L93 Difference]: Finished difference Result 143 states and 148 transitions. [2020-12-21 21:26:00,059 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2020-12-21 21:26:00,059 INFO L78 Accepts]: Start accepts. Automaton has 47 states. Word has length 95 [2020-12-21 21:26:00,059 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:26:00,060 INFO L225 Difference]: With dead ends: 143 [2020-12-21 21:26:00,060 INFO L226 Difference]: Without dead ends: 104 [2020-12-21 21:26:00,061 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 125 GetRequests, 80 SyntacticMatches, 0 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 448 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=617, Invalid=1545, Unknown=0, NotChecked=0, Total=2162 [2020-12-21 21:26:00,061 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 104 states. [2020-12-21 21:26:00,064 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 104 to 102. [2020-12-21 21:26:00,064 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 102 states. [2020-12-21 21:26:00,064 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 102 states to 102 states and 104 transitions. [2020-12-21 21:26:00,065 INFO L78 Accepts]: Start accepts. Automaton has 102 states and 104 transitions. Word has length 95 [2020-12-21 21:26:00,065 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:26:00,065 INFO L481 AbstractCegarLoop]: Abstraction has 102 states and 104 transitions. [2020-12-21 21:26:00,065 INFO L482 AbstractCegarLoop]: Interpolant automaton has 47 states. [2020-12-21 21:26:00,065 INFO L276 IsEmpty]: Start isEmpty. Operand 102 states and 104 transitions. [2020-12-21 21:26:00,066 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 100 [2020-12-21 21:26:00,066 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:26:00,066 INFO L422 BasicCegarLoop]: trace histogram [29, 29, 16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:26:00,280 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29,30 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:26:00,281 INFO L429 AbstractCegarLoop]: === Iteration 31 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:26:00,281 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:26:00,281 INFO L82 PathProgramCache]: Analyzing trace with hash 808565179, now seen corresponding path program 29 times [2020-12-21 21:26:00,281 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:26:00,281 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1057038380] [2020-12-21 21:26:00,281 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:26:00,306 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:26:00,945 INFO L134 CoverageAnalysis]: Checked inductivity of 1097 backedges. 0 proven. 841 refuted. 0 times theorem prover too weak. 256 trivial. 0 not checked. [2020-12-21 21:26:00,945 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1057038380] [2020-12-21 21:26:00,946 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2059027192] [2020-12-21 21:26:00,946 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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