/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_copy3_ground-2.i -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-4f750a8 [2020-12-21 21:24:17,726 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-12-21 21:24:17,732 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-12-21 21:24:17,796 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-12-21 21:24:17,797 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-12-21 21:24:17,802 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-12-21 21:24:17,807 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-12-21 21:24:17,818 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-12-21 21:24:17,823 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-12-21 21:24:17,832 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-12-21 21:24:17,834 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-12-21 21:24:17,836 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... 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[2020-12-21 21:24:17,929 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-12-21 21:24:17,930 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-12-21 21:24:17,931 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-12-21 21:24:17,937 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-Reach-64bit-Automizer_Default.epf [2020-12-21 21:24:17,994 INFO L113 SettingsManager]: Loading preferences was successful [2020-12-21 21:24:17,994 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-12-21 21:24:17,999 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-12-21 21:24:18,000 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-12-21 21:24:18,000 INFO L138 SettingsManager]: * Use SBE=true [2020-12-21 21:24:18,000 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-12-21 21:24:18,001 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-12-21 21:24:18,001 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-12-21 21:24:18,001 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-12-21 21:24:18,001 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-12-21 21:24:18,002 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-12-21 21:24:18,002 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-12-21 21:24:18,002 INFO L138 SettingsManager]: * Use constant arrays=true [2020-12-21 21:24:18,002 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-12-21 21:24:18,003 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-12-21 21:24:18,003 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-12-21 21:24:18,003 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-12-21 21:24:18,003 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-12-21 21:24:18,004 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-12-21 21:24:18,004 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-12-21 21:24:18,004 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-12-21 21:24:18,004 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-12-21 21:24:18,004 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-12-21 21:24:18,005 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-12-21 21:24:18,005 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-12-21 21:24:18,005 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release [2020-12-21 21:24:18,471 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-12-21 21:24:18,511 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-12-21 21:24:18,515 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-12-21 21:24:18,517 INFO L271 PluginConnector]: Initializing CDTParser... [2020-12-21 21:24:18,518 INFO L275 PluginConnector]: CDTParser initialized [2020-12-21 21:24:18,520 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/array-examples/standard_copy3_ground-2.i [2020-12-21 21:24:18,639 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/95466fe73/6c6f9aa15b5d454291ecf13622cb2667/FLAGf7d58a320 [2020-12-21 21:24:19,459 INFO L306 CDTParser]: Found 1 translation units. [2020-12-21 21:24:19,460 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/array-examples/standard_copy3_ground-2.i [2020-12-21 21:24:19,472 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/95466fe73/6c6f9aa15b5d454291ecf13622cb2667/FLAGf7d58a320 [2020-12-21 21:24:19,831 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/95466fe73/6c6f9aa15b5d454291ecf13622cb2667 [2020-12-21 21:24:19,835 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-12-21 21:24:19,839 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2020-12-21 21:24:19,841 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-12-21 21:24:19,842 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-12-21 21:24:19,847 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-12-21 21:24:19,849 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.12 09:24:19" (1/1) ... [2020-12-21 21:24:19,851 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@2493fc78 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 09:24:19, skipping insertion in model container [2020-12-21 21:24:19,852 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.12 09:24:19" (1/1) ... [2020-12-21 21:24:19,862 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-12-21 21:24:19,887 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-12-21 21:24:20,112 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_copy3_ground-2.i[816,829] [2020-12-21 21:24:20,138 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-12-21 21:24:20,150 INFO L203 MainTranslator]: Completed pre-run [2020-12-21 21:24:20,169 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_copy3_ground-2.i[816,829] [2020-12-21 21:24:20,183 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-12-21 21:24:20,200 INFO L208 MainTranslator]: Completed translation [2020-12-21 21:24:20,201 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 09:24:20 WrapperNode [2020-12-21 21:24:20,201 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-12-21 21:24:20,202 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2020-12-21 21:24:20,203 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2020-12-21 21:24:20,203 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2020-12-21 21:24:20,210 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 09:24:20" (1/1) ... [2020-12-21 21:24:20,219 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 09:24:20" (1/1) ... [2020-12-21 21:24:20,244 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2020-12-21 21:24:20,248 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-12-21 21:24:20,248 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-12-21 21:24:20,248 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-12-21 21:24:20,259 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 09:24:20" (1/1) ... [2020-12-21 21:24:20,259 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 09:24:20" (1/1) ... [2020-12-21 21:24:20,262 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 09:24:20" (1/1) ... [2020-12-21 21:24:20,263 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 09:24:20" (1/1) ... [2020-12-21 21:24:20,271 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 09:24:20" (1/1) ... [2020-12-21 21:24:20,277 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 09:24:20" (1/1) ... [2020-12-21 21:24:20,279 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 09:24:20" (1/1) ... [2020-12-21 21:24:20,282 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-12-21 21:24:20,283 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-12-21 21:24:20,284 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-12-21 21:24:20,284 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-12-21 21:24:20,285 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 09:24:20" (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 21:24:20,442 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2020-12-21 21:24:20,443 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-12-21 21:24:20,443 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-12-21 21:24:20,444 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-12-21 21:24:20,444 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-12-21 21:24:20,444 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-12-21 21:24:20,445 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-12-21 21:24:21,047 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-12-21 21:24:21,047 INFO L299 CfgBuilder]: Removed 11 assume(true) statements. [2020-12-21 21:24:21,054 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.12 09:24:21 BoogieIcfgContainer [2020-12-21 21:24:21,055 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-12-21 21:24:21,067 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-12-21 21:24:21,068 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-12-21 21:24:21,081 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-12-21 21:24:21,082 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.12 09:24:19" (1/3) ... [2020-12-21 21:24:21,090 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2cb1b0e8 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.12 09:24:21, skipping insertion in model container [2020-12-21 21:24:21,091 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 09:24:20" (2/3) ... [2020-12-21 21:24:21,092 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2cb1b0e8 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.12 09:24:21, skipping insertion in model container [2020-12-21 21:24:21,092 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.12 09:24:21" (3/3) ... [2020-12-21 21:24:21,099 INFO L111 eAbstractionObserver]: Analyzing ICFG standard_copy3_ground-2.i [2020-12-21 21:24:21,122 INFO L153 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2020-12-21 21:24:21,133 INFO L165 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-12-21 21:24:21,160 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-12-21 21:24:21,198 INFO L377 AbstractCegarLoop]: Interprodecural is true [2020-12-21 21:24:21,198 INFO L378 AbstractCegarLoop]: Hoare is true [2020-12-21 21:24:21,199 INFO L379 AbstractCegarLoop]: Compute interpolants for FPandBP [2020-12-21 21:24:21,199 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-12-21 21:24:21,199 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-12-21 21:24:21,199 INFO L382 AbstractCegarLoop]: Difference is false [2020-12-21 21:24:21,199 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-12-21 21:24:21,200 INFO L387 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-12-21 21:24:21,220 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states. [2020-12-21 21:24:21,228 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-12-21 21:24:21,228 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:24:21,229 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:24:21,230 INFO L429 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:24:21,238 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:24:21,239 INFO L82 PathProgramCache]: Analyzing trace with hash -2053894623, now seen corresponding path program 1 times [2020-12-21 21:24:21,263 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:24:21,265 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2023065520] [2020-12-21 21:24:21,265 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:24:21,507 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:24:21,664 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 21:24:21,667 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2023065520] [2020-12-21 21:24:21,669 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-12-21 21:24:21,670 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-12-21 21:24:21,671 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1777409832] [2020-12-21 21:24:21,680 INFO L461 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-12-21 21:24:21,681 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:24:21,708 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-12-21 21:24:21,712 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-12-21 21:24:21,715 INFO L87 Difference]: Start difference. First operand 24 states. Second operand 3 states. [2020-12-21 21:24:21,777 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:24:21,780 INFO L93 Difference]: Finished difference Result 46 states and 66 transitions. [2020-12-21 21:24:21,782 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-12-21 21:24:21,784 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 13 [2020-12-21 21:24:21,784 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:24:21,815 INFO L225 Difference]: With dead ends: 46 [2020-12-21 21:24:21,815 INFO L226 Difference]: Without dead ends: 22 [2020-12-21 21:24:21,820 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 21:24:21,847 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2020-12-21 21:24:21,867 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 21. [2020-12-21 21:24:21,869 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-12-21 21:24:21,872 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 25 transitions. [2020-12-21 21:24:21,875 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 25 transitions. Word has length 13 [2020-12-21 21:24:21,875 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:24:21,875 INFO L481 AbstractCegarLoop]: Abstraction has 21 states and 25 transitions. [2020-12-21 21:24:21,875 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-12-21 21:24:21,876 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 25 transitions. [2020-12-21 21:24:21,877 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2020-12-21 21:24:21,878 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:24:21,878 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:24:21,878 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-12-21 21:24:21,879 INFO L429 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:24:21,884 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:24:21,885 INFO L82 PathProgramCache]: Analyzing trace with hash -418223009, now seen corresponding path program 1 times [2020-12-21 21:24:21,885 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:24:21,886 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [558657267] [2020-12-21 21:24:21,886 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:24:21,948 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:24:22,003 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 21:24:22,004 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [558657267] [2020-12-21 21:24:22,004 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1861740569] [2020-12-21 21:24:22,005 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 21:24:22,076 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:24:22,079 INFO L263 TraceCheckSpWp]: Trace formula consists of 85 conjuncts, 2 conjunts are in the unsatisfiable core [2020-12-21 21:24:22,086 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:24:22,123 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 21:24:22,124 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 1 imperfect interpolant sequences. [2020-12-21 21:24:22,124 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [4] total 5 [2020-12-21 21:24:22,126 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1327179447] [2020-12-21 21:24:22,127 INFO L461 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-12-21 21:24:22,128 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:24:22,128 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-12-21 21:24:22,129 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2020-12-21 21:24:22,129 INFO L87 Difference]: Start difference. First operand 21 states and 25 transitions. Second operand 3 states. [2020-12-21 21:24:22,184 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:24:22,184 INFO L93 Difference]: Finished difference Result 40 states and 49 transitions. [2020-12-21 21:24:22,184 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-12-21 21:24:22,185 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 15 [2020-12-21 21:24:22,185 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:24:22,189 INFO L225 Difference]: With dead ends: 40 [2020-12-21 21:24:22,189 INFO L226 Difference]: Without dead ends: 27 [2020-12-21 21:24:22,191 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 15 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 21:24:22,192 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2020-12-21 21:24:22,203 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 24. [2020-12-21 21:24:22,203 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2020-12-21 21:24:22,207 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 28 transitions. [2020-12-21 21:24:22,208 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 28 transitions. Word has length 15 [2020-12-21 21:24:22,208 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:24:22,208 INFO L481 AbstractCegarLoop]: Abstraction has 24 states and 28 transitions. [2020-12-21 21:24:22,209 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-12-21 21:24:22,209 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 28 transitions. [2020-12-21 21:24:22,210 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-12-21 21:24:22,210 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:24:22,211 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:24:22,424 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1 [2020-12-21 21:24:22,426 INFO L429 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:24:22,427 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:24:22,428 INFO L82 PathProgramCache]: Analyzing trace with hash 241580185, now seen corresponding path program 1 times [2020-12-21 21:24:22,428 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:24:22,429 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1333210698] [2020-12-21 21:24:22,429 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:24:22,449 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:24:22,488 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2020-12-21 21:24:22,489 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1333210698] [2020-12-21 21:24:22,491 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1565865891] [2020-12-21 21:24:22,491 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 21:24:22,560 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:24:22,561 INFO L263 TraceCheckSpWp]: Trace formula consists of 97 conjuncts, 3 conjunts are in the unsatisfiable core [2020-12-21 21:24:22,564 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:24:22,642 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2020-12-21 21:24:22,643 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:24:22,643 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 5 [2020-12-21 21:24:22,643 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1579632666] [2020-12-21 21:24:22,646 INFO L461 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-12-21 21:24:22,646 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:24:22,648 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-12-21 21:24:22,649 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2020-12-21 21:24:22,655 INFO L87 Difference]: Start difference. First operand 24 states and 28 transitions. Second operand 5 states. [2020-12-21 21:24:22,695 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:24:22,696 INFO L93 Difference]: Finished difference Result 46 states and 54 transitions. [2020-12-21 21:24:22,696 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-12-21 21:24:22,697 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 21 [2020-12-21 21:24:22,697 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:24:22,699 INFO L225 Difference]: With dead ends: 46 [2020-12-21 21:24:22,699 INFO L226 Difference]: Without dead ends: 27 [2020-12-21 21:24:22,701 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 21 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 21:24:22,702 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2020-12-21 21:24:22,712 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 26. [2020-12-21 21:24:22,712 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-12-21 21:24:22,716 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 30 transitions. [2020-12-21 21:24:22,716 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 30 transitions. Word has length 21 [2020-12-21 21:24:22,716 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:24:22,717 INFO L481 AbstractCegarLoop]: Abstraction has 26 states and 30 transitions. [2020-12-21 21:24:22,717 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-12-21 21:24:22,717 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 30 transitions. [2020-12-21 21:24:22,718 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2020-12-21 21:24:22,718 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:24:22,719 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:24:22,932 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:24:22,933 INFO L429 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:24:22,934 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:24:22,935 INFO L82 PathProgramCache]: Analyzing trace with hash 456751319, now seen corresponding path program 2 times [2020-12-21 21:24:22,935 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:24:22,936 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1713641664] [2020-12-21 21:24:22,936 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:24:22,960 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:24:22,993 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2020-12-21 21:24:22,993 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1713641664] [2020-12-21 21:24:22,994 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1785263213] [2020-12-21 21:24:22,994 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 21:24:23,067 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2020-12-21 21:24:23,068 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 21:24:23,070 INFO L263 TraceCheckSpWp]: Trace formula consists of 105 conjuncts, 3 conjunts are in the unsatisfiable core [2020-12-21 21:24:23,072 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:24:23,127 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2020-12-21 21:24:23,128 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:24:23,128 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 5 [2020-12-21 21:24:23,129 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [214165785] [2020-12-21 21:24:23,129 INFO L461 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-12-21 21:24:23,130 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:24:23,130 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-12-21 21:24:23,131 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2020-12-21 21:24:23,131 INFO L87 Difference]: Start difference. First operand 26 states and 30 transitions. Second operand 5 states. [2020-12-21 21:24:23,225 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:24:23,225 INFO L93 Difference]: Finished difference Result 50 states and 59 transitions. [2020-12-21 21:24:23,226 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-12-21 21:24:23,226 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 23 [2020-12-21 21:24:23,226 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:24:23,227 INFO L225 Difference]: With dead ends: 50 [2020-12-21 21:24:23,227 INFO L226 Difference]: Without dead ends: 35 [2020-12-21 21:24:23,228 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 23 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 21:24:23,228 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2020-12-21 21:24:23,233 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 32. [2020-12-21 21:24:23,233 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2020-12-21 21:24:23,234 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 36 transitions. [2020-12-21 21:24:23,234 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 36 transitions. Word has length 23 [2020-12-21 21:24:23,235 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:24:23,235 INFO L481 AbstractCegarLoop]: Abstraction has 32 states and 36 transitions. [2020-12-21 21:24:23,235 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-12-21 21:24:23,235 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 36 transitions. [2020-12-21 21:24:23,236 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2020-12-21 21:24:23,236 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:24:23,236 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:24:23,450 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:24:23,451 INFO L429 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:24:23,452 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:24:23,453 INFO L82 PathProgramCache]: Analyzing trace with hash -1993618671, now seen corresponding path program 3 times [2020-12-21 21:24:23,453 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:24:23,454 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1442366677] [2020-12-21 21:24:23,454 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:24:23,509 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:24:23,553 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2020-12-21 21:24:23,554 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1442366677] [2020-12-21 21:24:23,554 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1186120482] [2020-12-21 21:24:23,554 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 21:24:23,622 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2020-12-21 21:24:23,622 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 21:24:23,624 INFO L263 TraceCheckSpWp]: Trace formula consists of 117 conjuncts, 4 conjunts are in the unsatisfiable core [2020-12-21 21:24:23,626 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:24:23,665 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2020-12-21 21:24:23,666 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:24:23,666 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 6 [2020-12-21 21:24:23,666 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1333104127] [2020-12-21 21:24:23,667 INFO L461 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-12-21 21:24:23,667 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:24:23,668 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-12-21 21:24:23,668 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2020-12-21 21:24:23,668 INFO L87 Difference]: Start difference. First operand 32 states and 36 transitions. Second operand 6 states. [2020-12-21 21:24:23,705 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:24:23,705 INFO L93 Difference]: Finished difference Result 60 states and 68 transitions. [2020-12-21 21:24:23,706 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-12-21 21:24:23,706 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 29 [2020-12-21 21:24:23,706 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:24:23,708 INFO L225 Difference]: With dead ends: 60 [2020-12-21 21:24:23,708 INFO L226 Difference]: Without dead ends: 35 [2020-12-21 21:24:23,709 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 29 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2020-12-21 21:24:23,710 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2020-12-21 21:24:23,719 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 34. [2020-12-21 21:24:23,719 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2020-12-21 21:24:23,725 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 38 transitions. [2020-12-21 21:24:23,726 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 38 transitions. Word has length 29 [2020-12-21 21:24:23,726 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:24:23,726 INFO L481 AbstractCegarLoop]: Abstraction has 34 states and 38 transitions. [2020-12-21 21:24:23,726 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-12-21 21:24:23,727 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 38 transitions. [2020-12-21 21:24:23,727 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2020-12-21 21:24:23,727 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:24:23,728 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:24:23,942 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:24:23,944 INFO L429 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:24:23,945 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:24:23,945 INFO L82 PathProgramCache]: Analyzing trace with hash 391245135, now seen corresponding path program 4 times [2020-12-21 21:24:23,946 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:24:23,946 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [522558816] [2020-12-21 21:24:23,946 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:24:23,981 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:24:24,025 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2020-12-21 21:24:24,026 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [522558816] [2020-12-21 21:24:24,026 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [164228953] [2020-12-21 21:24:24,026 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 21:24:24,089 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2020-12-21 21:24:24,089 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 21:24:24,090 INFO L263 TraceCheckSpWp]: Trace formula consists of 125 conjuncts, 5 conjunts are in the unsatisfiable core [2020-12-21 21:24:24,093 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:24:24,142 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2020-12-21 21:24:24,143 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:24:24,143 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 7 [2020-12-21 21:24:24,143 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2121420030] [2020-12-21 21:24:24,144 INFO L461 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-12-21 21:24:24,144 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:24:24,145 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-12-21 21:24:24,145 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2020-12-21 21:24:24,145 INFO L87 Difference]: Start difference. First operand 34 states and 38 transitions. Second operand 7 states. [2020-12-21 21:24:24,184 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:24:24,185 INFO L93 Difference]: Finished difference Result 62 states and 70 transitions. [2020-12-21 21:24:24,185 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-12-21 21:24:24,185 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 31 [2020-12-21 21:24:24,186 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:24:24,186 INFO L225 Difference]: With dead ends: 62 [2020-12-21 21:24:24,186 INFO L226 Difference]: Without dead ends: 37 [2020-12-21 21:24:24,187 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 31 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2020-12-21 21:24:24,188 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2020-12-21 21:24:24,192 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 36. [2020-12-21 21:24:24,192 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-12-21 21:24:24,193 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 40 transitions. [2020-12-21 21:24:24,193 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 40 transitions. Word has length 31 [2020-12-21 21:24:24,193 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:24:24,193 INFO L481 AbstractCegarLoop]: Abstraction has 36 states and 40 transitions. [2020-12-21 21:24:24,194 INFO L482 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-12-21 21:24:24,194 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 40 transitions. [2020-12-21 21:24:24,195 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2020-12-21 21:24:24,195 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:24:24,195 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:24:24,410 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2020-12-21 21:24:24,411 INFO L429 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:24:24,412 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:24:24,413 INFO L82 PathProgramCache]: Analyzing trace with hash -1267173363, now seen corresponding path program 5 times [2020-12-21 21:24:24,413 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:24:24,414 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2098074221] [2020-12-21 21:24:24,414 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:24:24,471 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:24:24,562 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2020-12-21 21:24:24,563 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2098074221] [2020-12-21 21:24:24,563 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [527535467] [2020-12-21 21:24:24,563 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 21:24:24,934 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 5 check-sat command(s) [2020-12-21 21:24:24,934 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 21:24:24,938 INFO L263 TraceCheckSpWp]: Trace formula consists of 133 conjuncts, 4 conjunts are in the unsatisfiable core [2020-12-21 21:24:24,941 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:24:24,996 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2020-12-21 21:24:24,997 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:24:24,997 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 5] total 10 [2020-12-21 21:24:24,998 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [358151930] [2020-12-21 21:24:24,998 INFO L461 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-12-21 21:24:24,998 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:24:24,999 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-12-21 21:24:24,999 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=60, Unknown=0, NotChecked=0, Total=90 [2020-12-21 21:24:25,000 INFO L87 Difference]: Start difference. First operand 36 states and 40 transitions. Second operand 10 states. [2020-12-21 21:24:25,124 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:24:25,124 INFO L93 Difference]: Finished difference Result 73 states and 84 transitions. [2020-12-21 21:24:25,125 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-12-21 21:24:25,125 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 33 [2020-12-21 21:24:25,126 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:24:25,126 INFO L225 Difference]: With dead ends: 73 [2020-12-21 21:24:25,127 INFO L226 Difference]: Without dead ends: 48 [2020-12-21 21:24:25,128 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 31 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=30, Invalid=60, Unknown=0, NotChecked=0, Total=90 [2020-12-21 21:24:25,128 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2020-12-21 21:24:25,133 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 44. [2020-12-21 21:24:25,134 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2020-12-21 21:24:25,135 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 48 transitions. [2020-12-21 21:24:25,135 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 48 transitions. Word has length 33 [2020-12-21 21:24:25,135 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:24:25,135 INFO L481 AbstractCegarLoop]: Abstraction has 44 states and 48 transitions. [2020-12-21 21:24:25,136 INFO L482 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-12-21 21:24:25,136 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 48 transitions. [2020-12-21 21:24:25,137 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-12-21 21:24:25,137 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:24:25,137 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:24:25,351 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:24:25,353 INFO L429 AbstractCegarLoop]: === Iteration 8 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:24:25,353 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:24:25,354 INFO L82 PathProgramCache]: Analyzing trace with hash -91572603, now seen corresponding path program 6 times [2020-12-21 21:24:25,354 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:24:25,355 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1906451191] [2020-12-21 21:24:25,355 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:24:25,381 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:24:25,486 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 27 trivial. 0 not checked. [2020-12-21 21:24:25,487 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1906451191] [2020-12-21 21:24:25,487 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1017054327] [2020-12-21 21:24:25,487 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 21:24:25,731 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 6 check-sat command(s) [2020-12-21 21:24:25,732 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 21:24:25,735 INFO L263 TraceCheckSpWp]: Trace formula consists of 153 conjuncts, 5 conjunts are in the unsatisfiable core [2020-12-21 21:24:25,738 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:24:25,828 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 43 trivial. 0 not checked. [2020-12-21 21:24:25,829 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:24:25,829 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 6] total 12 [2020-12-21 21:24:25,829 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [80890915] [2020-12-21 21:24:25,830 INFO L461 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-12-21 21:24:25,830 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:24:25,831 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-12-21 21:24:25,831 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=90, Unknown=0, NotChecked=0, Total=132 [2020-12-21 21:24:25,832 INFO L87 Difference]: Start difference. First operand 44 states and 48 transitions. Second operand 12 states. [2020-12-21 21:24:25,959 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:24:25,959 INFO L93 Difference]: Finished difference Result 87 states and 98 transitions. [2020-12-21 21:24:25,959 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-12-21 21:24:25,960 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 41 [2020-12-21 21:24:25,960 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:24:25,961 INFO L225 Difference]: With dead ends: 87 [2020-12-21 21:24:25,961 INFO L226 Difference]: Without dead ends: 56 [2020-12-21 21:24:25,962 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 38 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=42, Invalid=90, Unknown=0, NotChecked=0, Total=132 [2020-12-21 21:24:25,962 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2020-12-21 21:24:25,967 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 52. [2020-12-21 21:24:25,967 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 52 states. [2020-12-21 21:24:25,968 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 56 transitions. [2020-12-21 21:24:25,968 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 56 transitions. Word has length 41 [2020-12-21 21:24:25,968 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:24:25,969 INFO L481 AbstractCegarLoop]: Abstraction has 52 states and 56 transitions. [2020-12-21 21:24:25,969 INFO L482 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-12-21 21:24:25,969 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 56 transitions. [2020-12-21 21:24:25,970 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2020-12-21 21:24:25,970 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:24:25,970 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:24:26,184 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:24:26,185 INFO L429 AbstractCegarLoop]: === Iteration 9 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:24:26,186 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:24:26,187 INFO L82 PathProgramCache]: Analyzing trace with hash -673424131, now seen corresponding path program 7 times [2020-12-21 21:24:26,187 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:24:26,188 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [196020967] [2020-12-21 21:24:26,188 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:24:26,214 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:24:26,288 INFO L134 CoverageAnalysis]: Checked inductivity of 84 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 48 trivial. 0 not checked. [2020-12-21 21:24:26,289 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [196020967] [2020-12-21 21:24:26,289 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1530292006] [2020-12-21 21:24:26,289 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 21:24:26,367 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:24:26,368 INFO L263 TraceCheckSpWp]: Trace formula consists of 173 conjuncts, 8 conjunts are in the unsatisfiable core [2020-12-21 21:24:26,371 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:24:26,436 INFO L134 CoverageAnalysis]: Checked inductivity of 84 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 48 trivial. 0 not checked. [2020-12-21 21:24:26,437 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:24:26,437 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 10 [2020-12-21 21:24:26,437 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [58417623] [2020-12-21 21:24:26,438 INFO L461 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-12-21 21:24:26,438 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:24:26,439 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-12-21 21:24:26,439 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=45, Unknown=0, NotChecked=0, Total=90 [2020-12-21 21:24:26,439 INFO L87 Difference]: Start difference. First operand 52 states and 56 transitions. Second operand 10 states. [2020-12-21 21:24:26,483 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:24:26,483 INFO L93 Difference]: Finished difference Result 92 states and 100 transitions. [2020-12-21 21:24:26,484 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-12-21 21:24:26,484 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 49 [2020-12-21 21:24:26,484 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:24:26,485 INFO L225 Difference]: With dead ends: 92 [2020-12-21 21:24:26,485 INFO L226 Difference]: Without dead ends: 55 [2020-12-21 21:24:26,486 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 49 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=45, Invalid=45, Unknown=0, NotChecked=0, Total=90 [2020-12-21 21:24:26,487 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2020-12-21 21:24:26,491 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 54. [2020-12-21 21:24:26,492 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 54 states. [2020-12-21 21:24:26,492 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 58 transitions. [2020-12-21 21:24:26,493 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 58 transitions. Word has length 49 [2020-12-21 21:24:26,493 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:24:26,493 INFO L481 AbstractCegarLoop]: Abstraction has 54 states and 58 transitions. [2020-12-21 21:24:26,493 INFO L482 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-12-21 21:24:26,493 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 58 transitions. [2020-12-21 21:24:26,494 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2020-12-21 21:24:26,495 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:24:26,495 INFO L422 BasicCegarLoop]: trace histogram [7, 7, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:24:26,709 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable8 [2020-12-21 21:24:26,710 INFO L429 AbstractCegarLoop]: === Iteration 10 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:24:26,726 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:24:26,726 INFO L82 PathProgramCache]: Analyzing trace with hash 883487803, now seen corresponding path program 8 times [2020-12-21 21:24:26,727 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:24:26,727 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [776253677] [2020-12-21 21:24:26,727 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:24:26,760 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:24:26,850 INFO L134 CoverageAnalysis]: Checked inductivity of 97 backedges. 0 proven. 49 refuted. 0 times theorem prover too weak. 48 trivial. 0 not checked. [2020-12-21 21:24:26,851 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [776253677] [2020-12-21 21:24:26,851 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [811658972] [2020-12-21 21:24:26,851 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 21:24:26,934 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2020-12-21 21:24:26,934 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 21:24:26,936 INFO L263 TraceCheckSpWp]: Trace formula consists of 181 conjuncts, 9 conjunts are in the unsatisfiable core [2020-12-21 21:24:26,940 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:24:27,004 INFO L134 CoverageAnalysis]: Checked inductivity of 97 backedges. 0 proven. 49 refuted. 0 times theorem prover too weak. 48 trivial. 0 not checked. [2020-12-21 21:24:27,004 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:24:27,004 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10] total 11 [2020-12-21 21:24:27,005 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [281069805] [2020-12-21 21:24:27,005 INFO L461 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-12-21 21:24:27,005 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:24:27,006 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-12-21 21:24:27,006 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=55, Unknown=0, NotChecked=0, Total=110 [2020-12-21 21:24:27,007 INFO L87 Difference]: Start difference. First operand 54 states and 58 transitions. Second operand 11 states. [2020-12-21 21:24:27,052 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:24:27,053 INFO L93 Difference]: Finished difference Result 94 states and 102 transitions. [2020-12-21 21:24:27,054 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-12-21 21:24:27,054 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 51 [2020-12-21 21:24:27,054 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:24:27,055 INFO L225 Difference]: With dead ends: 94 [2020-12-21 21:24:27,055 INFO L226 Difference]: Without dead ends: 57 [2020-12-21 21:24:27,056 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 60 GetRequests, 51 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 21:24:27,056 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2020-12-21 21:24:27,066 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 56. [2020-12-21 21:24:27,067 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2020-12-21 21:24:27,067 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 60 transitions. [2020-12-21 21:24:27,068 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 60 transitions. Word has length 51 [2020-12-21 21:24:27,068 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:24:27,068 INFO L481 AbstractCegarLoop]: Abstraction has 56 states and 60 transitions. [2020-12-21 21:24:27,068 INFO L482 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-12-21 21:24:27,068 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 60 transitions. [2020-12-21 21:24:27,069 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2020-12-21 21:24:27,069 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:24:27,070 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:24:27,278 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,10 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:24:27,279 INFO L429 AbstractCegarLoop]: === Iteration 11 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:24:27,280 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:24:27,280 INFO L82 PathProgramCache]: Analyzing trace with hash -1867729927, now seen corresponding path program 9 times [2020-12-21 21:24:27,280 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:24:27,281 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2122602030] [2020-12-21 21:24:27,281 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:24:27,338 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:24:27,478 INFO L134 CoverageAnalysis]: Checked inductivity of 112 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 48 trivial. 0 not checked. [2020-12-21 21:24:27,478 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2122602030] [2020-12-21 21:24:27,479 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [644128952] [2020-12-21 21:24:27,479 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 21:24:27,710 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2020-12-21 21:24:27,711 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 21:24:27,713 INFO L263 TraceCheckSpWp]: Trace formula consists of 157 conjuncts, 6 conjunts are in the unsatisfiable core [2020-12-21 21:24:27,716 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:24:27,842 INFO L134 CoverageAnalysis]: Checked inductivity of 112 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 96 trivial. 0 not checked. [2020-12-21 21:24:27,843 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:24:27,843 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 7] total 16 [2020-12-21 21:24:27,843 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [269918501] [2020-12-21 21:24:27,844 INFO L461 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-12-21 21:24:27,844 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:24:27,845 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-12-21 21:24:27,845 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=75, Invalid=165, Unknown=0, NotChecked=0, Total=240 [2020-12-21 21:24:27,845 INFO L87 Difference]: Start difference. First operand 56 states and 60 transitions. Second operand 16 states. [2020-12-21 21:24:28,041 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:24:28,041 INFO L93 Difference]: Finished difference Result 105 states and 116 transitions. [2020-12-21 21:24:28,042 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-12-21 21:24:28,042 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 53 [2020-12-21 21:24:28,042 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:24:28,043 INFO L225 Difference]: With dead ends: 105 [2020-12-21 21:24:28,043 INFO L226 Difference]: Without dead ends: 68 [2020-12-21 21:24:28,048 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 63 GetRequests, 49 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=75, Invalid=165, Unknown=0, NotChecked=0, Total=240 [2020-12-21 21:24:28,049 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2020-12-21 21:24:28,069 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 64. [2020-12-21 21:24:28,070 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 64 states. [2020-12-21 21:24:28,070 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 68 transitions. [2020-12-21 21:24:28,070 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 68 transitions. Word has length 53 [2020-12-21 21:24:28,071 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:24:28,071 INFO L481 AbstractCegarLoop]: Abstraction has 64 states and 68 transitions. [2020-12-21 21:24:28,075 INFO L482 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-12-21 21:24:28,076 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 68 transitions. [2020-12-21 21:24:28,076 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2020-12-21 21:24:28,077 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:24:28,077 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 5, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:24:28,292 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,11 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:24:28,294 INFO L429 AbstractCegarLoop]: === Iteration 12 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:24:28,294 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:24:28,295 INFO L82 PathProgramCache]: Analyzing trace with hash -179501455, now seen corresponding path program 10 times [2020-12-21 21:24:28,295 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:24:28,296 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [502183655] [2020-12-21 21:24:28,296 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:24:28,352 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:24:28,483 INFO L134 CoverageAnalysis]: Checked inductivity of 156 backedges. 0 proven. 81 refuted. 0 times theorem prover too weak. 75 trivial. 0 not checked. [2020-12-21 21:24:28,484 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [502183655] [2020-12-21 21:24:28,484 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [98177324] [2020-12-21 21:24:28,484 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 21:24:28,573 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2020-12-21 21:24:28,573 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 21:24:28,575 INFO L263 TraceCheckSpWp]: Trace formula consists of 209 conjuncts, 11 conjunts are in the unsatisfiable core [2020-12-21 21:24:28,579 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:24:28,660 INFO L134 CoverageAnalysis]: Checked inductivity of 156 backedges. 0 proven. 81 refuted. 0 times theorem prover too weak. 75 trivial. 0 not checked. [2020-12-21 21:24:28,660 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:24:28,660 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12] total 13 [2020-12-21 21:24:28,661 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [248008875] [2020-12-21 21:24:28,661 INFO L461 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-12-21 21:24:28,662 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:24:28,663 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-12-21 21:24:28,663 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=78, Unknown=0, NotChecked=0, Total=156 [2020-12-21 21:24:28,663 INFO L87 Difference]: Start difference. First operand 64 states and 68 transitions. Second operand 13 states. [2020-12-21 21:24:28,715 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:24:28,716 INFO L93 Difference]: Finished difference Result 110 states and 118 transitions. [2020-12-21 21:24:28,716 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-12-21 21:24:28,717 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 61 [2020-12-21 21:24:28,717 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:24:28,717 INFO L225 Difference]: With dead ends: 110 [2020-12-21 21:24:28,717 INFO L226 Difference]: Without dead ends: 67 [2020-12-21 21:24:28,718 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 72 GetRequests, 61 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=78, Invalid=78, Unknown=0, NotChecked=0, Total=156 [2020-12-21 21:24:28,719 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2020-12-21 21:24:28,723 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 66. [2020-12-21 21:24:28,724 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 66 states. [2020-12-21 21:24:28,725 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 70 transitions. [2020-12-21 21:24:28,725 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 70 transitions. Word has length 61 [2020-12-21 21:24:28,725 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:24:28,725 INFO L481 AbstractCegarLoop]: Abstraction has 66 states and 70 transitions. [2020-12-21 21:24:28,725 INFO L482 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-12-21 21:24:28,726 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 70 transitions. [2020-12-21 21:24:28,726 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2020-12-21 21:24:28,727 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:24:28,727 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 5, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:24:28,940 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2020-12-21 21:24:28,941 INFO L429 AbstractCegarLoop]: === Iteration 13 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:24:28,942 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:24:28,942 INFO L82 PathProgramCache]: Analyzing trace with hash -1934970705, now seen corresponding path program 11 times [2020-12-21 21:24:28,942 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:24:28,943 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1827213554] [2020-12-21 21:24:28,943 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:24:28,979 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:24:29,111 INFO L134 CoverageAnalysis]: Checked inductivity of 175 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 75 trivial. 0 not checked. [2020-12-21 21:24:29,112 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1827213554] [2020-12-21 21:24:29,112 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [557876511] [2020-12-21 21:24:29,112 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