/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_two_index_06.i -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-4f750a8 [2020-12-21 21:43:36,932 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-12-21 21:43:36,935 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-12-21 21:43:36,979 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-12-21 21:43:36,980 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-12-21 21:43:36,981 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-12-21 21:43:36,993 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-12-21 21:43:37,003 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-12-21 21:43:37,006 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-12-21 21:43:37,010 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-12-21 21:43:37,011 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-12-21 21:43:37,012 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... 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[2020-12-21 21:43:37,049 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-12-21 21:43:37,050 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-12-21 21:43:37,051 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-12-21 21:43:37,052 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-Reach-64bit-Automizer_Default.epf [2020-12-21 21:43:37,081 INFO L113 SettingsManager]: Loading preferences was successful [2020-12-21 21:43:37,081 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-12-21 21:43:37,083 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-12-21 21:43:37,083 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-12-21 21:43:37,083 INFO L138 SettingsManager]: * Use SBE=true [2020-12-21 21:43:37,083 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-12-21 21:43:37,084 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-12-21 21:43:37,084 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-12-21 21:43:37,084 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-12-21 21:43:37,084 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-12-21 21:43:37,084 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-12-21 21:43:37,084 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-12-21 21:43:37,085 INFO L138 SettingsManager]: * Use constant arrays=true [2020-12-21 21:43:37,085 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-12-21 21:43:37,085 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-12-21 21:43:37,085 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-12-21 21:43:37,086 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-12-21 21:43:37,086 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-12-21 21:43:37,086 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-12-21 21:43:37,086 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-12-21 21:43:37,087 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-12-21 21:43:37,087 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-12-21 21:43:37,087 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-12-21 21:43:37,087 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-12-21 21:43:37,087 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-12-21 21:43:37,087 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release [2020-12-21 21:43:37,491 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-12-21 21:43:37,530 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-12-21 21:43:37,534 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-12-21 21:43:37,535 INFO L271 PluginConnector]: Initializing CDTParser... [2020-12-21 21:43:37,536 INFO L275 PluginConnector]: CDTParser initialized [2020-12-21 21:43:37,537 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/array-examples/standard_two_index_06.i [2020-12-21 21:43:37,659 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/be7c353c4/71dade4535fc4e26bf4537cfea413aac/FLAGb90a1c5da [2020-12-21 21:43:38,324 INFO L306 CDTParser]: Found 1 translation units. [2020-12-21 21:43:38,325 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/array-examples/standard_two_index_06.i [2020-12-21 21:43:38,333 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/be7c353c4/71dade4535fc4e26bf4537cfea413aac/FLAGb90a1c5da [2020-12-21 21:43:38,693 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/be7c353c4/71dade4535fc4e26bf4537cfea413aac [2020-12-21 21:43:38,696 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-12-21 21:43:38,698 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2020-12-21 21:43:38,702 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-12-21 21:43:38,702 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-12-21 21:43:38,706 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-12-21 21:43:38,707 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.12 09:43:38" (1/1) ... [2020-12-21 21:43:38,709 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@64c4258 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 09:43:38, skipping insertion in model container [2020-12-21 21:43:38,710 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.12 09:43:38" (1/1) ... [2020-12-21 21:43:38,718 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-12-21 21:43:38,741 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-12-21 21:43:38,964 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_two_index_06.i[814,827] [2020-12-21 21:43:38,980 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-12-21 21:43:38,989 INFO L203 MainTranslator]: Completed pre-run [2020-12-21 21:43:39,003 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_two_index_06.i[814,827] [2020-12-21 21:43:39,011 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-12-21 21:43:39,028 INFO L208 MainTranslator]: Completed translation [2020-12-21 21:43:39,029 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 09:43:39 WrapperNode [2020-12-21 21:43:39,029 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-12-21 21:43:39,031 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2020-12-21 21:43:39,031 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2020-12-21 21:43:39,031 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2020-12-21 21:43:39,040 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 09:43:39" (1/1) ... [2020-12-21 21:43:39,048 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 09:43:39" (1/1) ... [2020-12-21 21:43:39,070 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2020-12-21 21:43:39,071 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-12-21 21:43:39,071 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-12-21 21:43:39,071 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-12-21 21:43:39,081 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 09:43:39" (1/1) ... [2020-12-21 21:43:39,082 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 09:43:39" (1/1) ... [2020-12-21 21:43:39,095 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 09:43:39" (1/1) ... [2020-12-21 21:43:39,096 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 09:43:39" (1/1) ... [2020-12-21 21:43:39,104 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 09:43:39" (1/1) ... [2020-12-21 21:43:39,119 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 09:43:39" (1/1) ... [2020-12-21 21:43:39,120 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 09:43:39" (1/1) ... [2020-12-21 21:43:39,124 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-12-21 21:43:39,129 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-12-21 21:43:39,130 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-12-21 21:43:39,130 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-12-21 21:43:39,131 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 09:43:39" (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 21:43:39,245 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2020-12-21 21:43:39,245 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-12-21 21:43:39,245 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-12-21 21:43:39,245 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-12-21 21:43:39,245 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-12-21 21:43:39,246 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-12-21 21:43:39,246 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-12-21 21:43:39,499 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-12-21 21:43:39,500 INFO L299 CfgBuilder]: Removed 9 assume(true) statements. [2020-12-21 21:43:39,501 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.12 09:43:39 BoogieIcfgContainer [2020-12-21 21:43:39,501 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-12-21 21:43:39,503 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-12-21 21:43:39,504 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-12-21 21:43:39,507 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-12-21 21:43:39,508 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.12 09:43:38" (1/3) ... [2020-12-21 21:43:39,509 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2bc27d31 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.12 09:43:39, skipping insertion in model container [2020-12-21 21:43:39,509 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 09:43:39" (2/3) ... [2020-12-21 21:43:39,509 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2bc27d31 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.12 09:43:39, skipping insertion in model container [2020-12-21 21:43:39,510 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.12 09:43:39" (3/3) ... [2020-12-21 21:43:39,511 INFO L111 eAbstractionObserver]: Analyzing ICFG standard_two_index_06.i [2020-12-21 21:43:39,519 INFO L153 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2020-12-21 21:43:39,524 INFO L165 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-12-21 21:43:39,548 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-12-21 21:43:39,577 INFO L377 AbstractCegarLoop]: Interprodecural is true [2020-12-21 21:43:39,577 INFO L378 AbstractCegarLoop]: Hoare is true [2020-12-21 21:43:39,577 INFO L379 AbstractCegarLoop]: Compute interpolants for FPandBP [2020-12-21 21:43:39,577 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-12-21 21:43:39,578 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-12-21 21:43:39,578 INFO L382 AbstractCegarLoop]: Difference is false [2020-12-21 21:43:39,578 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-12-21 21:43:39,578 INFO L387 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-12-21 21:43:39,594 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states. [2020-12-21 21:43:39,637 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2020-12-21 21:43:39,637 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:43:39,638 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:43:39,639 INFO L429 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:43:39,663 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:43:39,663 INFO L82 PathProgramCache]: Analyzing trace with hash -1157635880, now seen corresponding path program 1 times [2020-12-21 21:43:39,689 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:43:39,690 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1539502785] [2020-12-21 21:43:39,690 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:43:39,805 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:43:39,880 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 21:43:39,881 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1539502785] [2020-12-21 21:43:39,882 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-12-21 21:43:39,883 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-12-21 21:43:39,883 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [707986696] [2020-12-21 21:43:39,888 INFO L461 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-12-21 21:43:39,889 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:43:39,905 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-12-21 21:43:39,906 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-12-21 21:43:39,909 INFO L87 Difference]: Start difference. First operand 15 states. Second operand 3 states. [2020-12-21 21:43:39,959 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:43:39,960 INFO L93 Difference]: Finished difference Result 28 states and 40 transitions. [2020-12-21 21:43:39,961 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-12-21 21:43:39,962 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 9 [2020-12-21 21:43:39,963 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:43:39,973 INFO L225 Difference]: With dead ends: 28 [2020-12-21 21:43:39,973 INFO L226 Difference]: Without dead ends: 12 [2020-12-21 21:43:39,977 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 21:43:39,999 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12 states. [2020-12-21 21:43:40,024 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12 to 12. [2020-12-21 21:43:40,028 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 12 states. [2020-12-21 21:43:40,029 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 14 transitions. [2020-12-21 21:43:40,034 INFO L78 Accepts]: Start accepts. Automaton has 12 states and 14 transitions. Word has length 9 [2020-12-21 21:43:40,035 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:43:40,035 INFO L481 AbstractCegarLoop]: Abstraction has 12 states and 14 transitions. [2020-12-21 21:43:40,035 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-12-21 21:43:40,035 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states and 14 transitions. [2020-12-21 21:43:40,036 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2020-12-21 21:43:40,036 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:43:40,036 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:43:40,037 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-12-21 21:43:40,037 INFO L429 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:43:40,041 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:43:40,042 INFO L82 PathProgramCache]: Analyzing trace with hash 722375763, now seen corresponding path program 1 times [2020-12-21 21:43:40,042 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:43:40,042 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1912791146] [2020-12-21 21:43:40,043 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:43:40,086 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:43:40,149 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 21:43:40,150 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1912791146] [2020-12-21 21:43:40,150 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1672628026] [2020-12-21 21:43:40,150 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 21:43:40,236 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:43:40,239 INFO L263 TraceCheckSpWp]: Trace formula consists of 69 conjuncts, 2 conjunts are in the unsatisfiable core [2020-12-21 21:43:40,244 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:43:40,269 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 21:43:40,270 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 1 imperfect interpolant sequences. [2020-12-21 21:43:40,270 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [4] total 4 [2020-12-21 21:43:40,271 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1712723769] [2020-12-21 21:43:40,272 INFO L461 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-12-21 21:43:40,272 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:43:40,273 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-12-21 21:43:40,274 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2020-12-21 21:43:40,274 INFO L87 Difference]: Start difference. First operand 12 states and 14 transitions. Second operand 3 states. [2020-12-21 21:43:40,311 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:43:40,312 INFO L93 Difference]: Finished difference Result 24 states and 27 transitions. [2020-12-21 21:43:40,313 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-12-21 21:43:40,313 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 10 [2020-12-21 21:43:40,313 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:43:40,314 INFO L225 Difference]: With dead ends: 24 [2020-12-21 21:43:40,314 INFO L226 Difference]: Without dead ends: 18 [2020-12-21 21:43:40,315 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 11 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2020-12-21 21:43:40,316 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2020-12-21 21:43:40,318 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 13. [2020-12-21 21:43:40,319 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 13 states. [2020-12-21 21:43:40,319 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 15 transitions. [2020-12-21 21:43:40,320 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 15 transitions. Word has length 10 [2020-12-21 21:43:40,320 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:43:40,320 INFO L481 AbstractCegarLoop]: Abstraction has 13 states and 15 transitions. [2020-12-21 21:43:40,320 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-12-21 21:43:40,320 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 15 transitions. [2020-12-21 21:43:40,321 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2020-12-21 21:43:40,321 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:43:40,321 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:43:40,535 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1 [2020-12-21 21:43:40,536 INFO L429 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:43:40,538 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:43:40,538 INFO L82 PathProgramCache]: Analyzing trace with hash 970258327, now seen corresponding path program 1 times [2020-12-21 21:43:40,539 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:43:40,539 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1322907118] [2020-12-21 21:43:40,539 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:43:40,574 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:43:40,644 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 21:43:40,645 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1322907118] [2020-12-21 21:43:40,645 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [745261053] [2020-12-21 21:43:40,645 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 21:43:40,704 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:43:40,705 INFO L263 TraceCheckSpWp]: Trace formula consists of 75 conjuncts, 3 conjunts are in the unsatisfiable core [2020-12-21 21:43:40,706 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:43:40,776 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 21:43:40,777 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:43:40,777 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 5 [2020-12-21 21:43:40,777 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2066669703] [2020-12-21 21:43:40,778 INFO L461 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-12-21 21:43:40,778 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:43:40,779 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-12-21 21:43:40,780 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2020-12-21 21:43:40,780 INFO L87 Difference]: Start difference. First operand 13 states and 15 transitions. Second operand 5 states. [2020-12-21 21:43:40,813 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:43:40,813 INFO L93 Difference]: Finished difference Result 28 states and 32 transitions. [2020-12-21 21:43:40,814 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-12-21 21:43:40,814 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 11 [2020-12-21 21:43:40,815 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:43:40,815 INFO L225 Difference]: With dead ends: 28 [2020-12-21 21:43:40,815 INFO L226 Difference]: Without dead ends: 19 [2020-12-21 21:43:40,816 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 11 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 21:43:40,817 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2020-12-21 21:43:40,823 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 14. [2020-12-21 21:43:40,824 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2020-12-21 21:43:40,824 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 16 transitions. [2020-12-21 21:43:40,824 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 16 transitions. Word has length 11 [2020-12-21 21:43:40,825 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:43:40,825 INFO L481 AbstractCegarLoop]: Abstraction has 14 states and 16 transitions. [2020-12-21 21:43:40,825 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-12-21 21:43:40,825 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 16 transitions. [2020-12-21 21:43:40,826 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2020-12-21 21:43:40,826 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:43:40,826 INFO L422 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:43:41,039 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:43:41,041 INFO L429 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:43:41,042 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:43:41,043 INFO L82 PathProgramCache]: Analyzing trace with hash -519784366, now seen corresponding path program 2 times [2020-12-21 21:43:41,043 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:43:41,043 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [990622623] [2020-12-21 21:43:41,044 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:43:41,093 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:43:41,131 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 21:43:41,131 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [990622623] [2020-12-21 21:43:41,132 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1630956359] [2020-12-21 21:43:41,132 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 21:43:41,193 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2020-12-21 21:43:41,193 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 21:43:41,194 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 4 conjunts are in the unsatisfiable core [2020-12-21 21:43:41,197 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:43:41,271 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-12-21 21:43:41,272 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:43:41,272 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 5] total 7 [2020-12-21 21:43:41,273 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [598917676] [2020-12-21 21:43:41,274 INFO L461 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-12-21 21:43:41,276 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:43:41,278 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-12-21 21:43:41,280 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=22, Unknown=0, NotChecked=0, Total=42 [2020-12-21 21:43:41,281 INFO L87 Difference]: Start difference. First operand 14 states and 16 transitions. Second operand 7 states. [2020-12-21 21:43:41,385 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:43:41,385 INFO L93 Difference]: Finished difference Result 36 states and 42 transitions. [2020-12-21 21:43:41,387 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-12-21 21:43:41,388 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 12 [2020-12-21 21:43:41,388 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:43:41,389 INFO L225 Difference]: With dead ends: 36 [2020-12-21 21:43:41,389 INFO L226 Difference]: Without dead ends: 27 [2020-12-21 21:43:41,390 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=20, Invalid=22, Unknown=0, NotChecked=0, Total=42 [2020-12-21 21:43:41,390 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2020-12-21 21:43:41,393 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 17. [2020-12-21 21:43:41,394 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2020-12-21 21:43:41,398 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 19 transitions. [2020-12-21 21:43:41,398 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 19 transitions. Word has length 12 [2020-12-21 21:43:41,398 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:43:41,398 INFO L481 AbstractCegarLoop]: Abstraction has 17 states and 19 transitions. [2020-12-21 21:43:41,399 INFO L482 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-12-21 21:43:41,399 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 19 transitions. [2020-12-21 21:43:41,402 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2020-12-21 21:43:41,403 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:43:41,403 INFO L422 BasicCegarLoop]: trace histogram [4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:43:41,604 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:43:41,605 INFO L429 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:43:41,606 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:43:41,606 INFO L82 PathProgramCache]: Analyzing trace with hash -1963781416, now seen corresponding path program 3 times [2020-12-21 21:43:41,607 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:43:41,607 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2056875399] [2020-12-21 21:43:41,608 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:43:41,658 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:43:41,696 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2020-12-21 21:43:41,696 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2056875399] [2020-12-21 21:43:41,696 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1085989299] [2020-12-21 21:43:41,697 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 21:43:41,743 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2020-12-21 21:43:41,744 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 21:43:41,745 INFO L263 TraceCheckSpWp]: Trace formula consists of 87 conjuncts, 4 conjunts are in the unsatisfiable core [2020-12-21 21:43:41,747 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:43:41,786 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2020-12-21 21:43:41,805 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:43:41,805 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 6 [2020-12-21 21:43:41,806 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [346824493] [2020-12-21 21:43:41,806 INFO L461 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-12-21 21:43:41,807 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:43:41,807 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-12-21 21:43:41,808 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2020-12-21 21:43:41,808 INFO L87 Difference]: Start difference. First operand 17 states and 19 transitions. Second operand 6 states. [2020-12-21 21:43:41,865 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:43:41,866 INFO L93 Difference]: Finished difference Result 39 states and 42 transitions. [2020-12-21 21:43:41,866 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-12-21 21:43:41,866 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 15 [2020-12-21 21:43:41,867 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:43:41,868 INFO L225 Difference]: With dead ends: 39 [2020-12-21 21:43:41,868 INFO L226 Difference]: Without dead ends: 33 [2020-12-21 21:43:41,868 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 15 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 21:43:41,869 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2020-12-21 21:43:41,873 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 18. [2020-12-21 21:43:41,873 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2020-12-21 21:43:41,874 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 20 transitions. [2020-12-21 21:43:41,874 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 20 transitions. Word has length 15 [2020-12-21 21:43:41,874 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:43:41,874 INFO L481 AbstractCegarLoop]: Abstraction has 18 states and 20 transitions. [2020-12-21 21:43:41,875 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-12-21 21:43:41,875 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 20 transitions. [2020-12-21 21:43:41,875 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-12-21 21:43:41,876 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:43:41,876 INFO L422 BasicCegarLoop]: trace histogram [4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:43:42,088 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:43:42,089 INFO L429 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:43:42,090 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:43:42,090 INFO L82 PathProgramCache]: Analyzing trace with hash -696235598, now seen corresponding path program 4 times [2020-12-21 21:43:42,091 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:43:42,091 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1141832126] [2020-12-21 21:43:42,091 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:43:42,115 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:43:42,156 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2020-12-21 21:43:42,157 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1141832126] [2020-12-21 21:43:42,157 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1898592865] [2020-12-21 21:43:42,157 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 21:43:42,220 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2020-12-21 21:43:42,220 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 21:43:42,221 INFO L263 TraceCheckSpWp]: Trace formula consists of 105 conjuncts, 6 conjunts are in the unsatisfiable core [2020-12-21 21:43:42,223 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:43:42,285 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2020-12-21 21:43:42,286 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:43:42,286 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7] total 11 [2020-12-21 21:43:42,286 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [553975908] [2020-12-21 21:43:42,287 INFO L461 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-12-21 21:43:42,287 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:43:42,288 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-12-21 21:43:42,288 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=54, Invalid=56, Unknown=0, NotChecked=0, Total=110 [2020-12-21 21:43:42,288 INFO L87 Difference]: Start difference. First operand 18 states and 20 transitions. Second operand 11 states. [2020-12-21 21:43:42,348 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:43:42,348 INFO L93 Difference]: Finished difference Result 54 states and 62 transitions. [2020-12-21 21:43:42,348 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-12-21 21:43:42,349 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 16 [2020-12-21 21:43:42,349 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:43:42,350 INFO L225 Difference]: With dead ends: 54 [2020-12-21 21:43:42,350 INFO L226 Difference]: Without dead ends: 43 [2020-12-21 21:43:42,351 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 12 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 21 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=54, Invalid=56, Unknown=0, NotChecked=0, Total=110 [2020-12-21 21:43:42,351 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2020-12-21 21:43:42,355 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 23. [2020-12-21 21:43:42,355 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2020-12-21 21:43:42,356 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 25 transitions. [2020-12-21 21:43:42,356 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 25 transitions. Word has length 16 [2020-12-21 21:43:42,356 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:43:42,356 INFO L481 AbstractCegarLoop]: Abstraction has 23 states and 25 transitions. [2020-12-21 21:43:42,357 INFO L482 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-12-21 21:43:42,357 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 25 transitions. [2020-12-21 21:43:42,357 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-12-21 21:43:42,357 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:43:42,358 INFO L422 BasicCegarLoop]: trace histogram [8, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:43:42,572 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2020-12-21 21:43:42,573 INFO L429 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:43:42,574 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:43:42,574 INFO L82 PathProgramCache]: Analyzing trace with hash 1003861208, now seen corresponding path program 5 times [2020-12-21 21:43:42,574 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:43:42,575 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [860748453] [2020-12-21 21:43:42,575 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:43:42,609 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:43:42,692 INFO L134 CoverageAnalysis]: Checked inductivity of 46 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2020-12-21 21:43:42,693 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [860748453] [2020-12-21 21:43:42,693 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [829730229] [2020-12-21 21:43:42,693 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 21:43:42,834 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 5 check-sat command(s) [2020-12-21 21:43:42,834 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 21:43:42,836 INFO L263 TraceCheckSpWp]: Trace formula consists of 135 conjuncts, 10 conjunts are in the unsatisfiable core [2020-12-21 21:43:42,838 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:43:42,950 INFO L134 CoverageAnalysis]: Checked inductivity of 46 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2020-12-21 21:43:42,950 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:43:42,951 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 11] total 15 [2020-12-21 21:43:42,951 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1929905111] [2020-12-21 21:43:42,952 INFO L461 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-12-21 21:43:42,952 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:43:42,952 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-12-21 21:43:42,953 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=104, Invalid=106, Unknown=0, NotChecked=0, Total=210 [2020-12-21 21:43:42,953 INFO L87 Difference]: Start difference. First operand 23 states and 25 transitions. Second operand 15 states. [2020-12-21 21:43:43,042 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:43:43,042 INFO L93 Difference]: Finished difference Result 65 states and 73 transitions. [2020-12-21 21:43:43,043 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-12-21 21:43:43,043 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 21 [2020-12-21 21:43:43,043 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:43:43,044 INFO L225 Difference]: With dead ends: 65 [2020-12-21 21:43:43,044 INFO L226 Difference]: Without dead ends: 53 [2020-12-21 21:43:43,045 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 61 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=104, Invalid=106, Unknown=0, NotChecked=0, Total=210 [2020-12-21 21:43:43,046 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2020-12-21 21:43:43,050 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 28. [2020-12-21 21:43:43,050 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2020-12-21 21:43:43,051 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 30 transitions. [2020-12-21 21:43:43,051 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 30 transitions. Word has length 21 [2020-12-21 21:43:43,052 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:43:43,052 INFO L481 AbstractCegarLoop]: Abstraction has 28 states and 30 transitions. [2020-12-21 21:43:43,052 INFO L482 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-12-21 21:43:43,052 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 30 transitions. [2020-12-21 21:43:43,053 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-12-21 21:43:43,053 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:43:43,053 INFO L422 BasicCegarLoop]: trace histogram [12, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:43:43,266 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:43:43,267 INFO L429 AbstractCegarLoop]: === Iteration 8 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:43:43,268 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:43:43,269 INFO L82 PathProgramCache]: Analyzing trace with hash 1992579314, now seen corresponding path program 6 times [2020-12-21 21:43:43,269 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:43:43,269 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [725716259] [2020-12-21 21:43:43,269 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:43:43,298 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:43:43,370 INFO L134 CoverageAnalysis]: Checked inductivity of 93 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2020-12-21 21:43:43,371 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [725716259] [2020-12-21 21:43:43,372 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1078654215] [2020-12-21 21:43:43,372 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 21:43:43,699 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2020-12-21 21:43:43,699 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 21:43:43,702 INFO L263 TraceCheckSpWp]: Trace formula consists of 165 conjuncts, 7 conjunts are in the unsatisfiable core [2020-12-21 21:43:43,704 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:43:43,790 INFO L134 CoverageAnalysis]: Checked inductivity of 93 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2020-12-21 21:43:43,791 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:43:43,791 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 9 [2020-12-21 21:43:43,791 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [890918154] [2020-12-21 21:43:43,792 INFO L461 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-12-21 21:43:43,792 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:43:43,792 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-12-21 21:43:43,793 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=36, Unknown=0, NotChecked=0, Total=72 [2020-12-21 21:43:43,793 INFO L87 Difference]: Start difference. First operand 28 states and 30 transitions. Second operand 9 states. [2020-12-21 21:43:43,868 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:43:43,868 INFO L93 Difference]: Finished difference Result 65 states and 68 transitions. [2020-12-21 21:43:43,868 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-12-21 21:43:43,869 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 26 [2020-12-21 21:43:43,869 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:43:43,870 INFO L225 Difference]: With dead ends: 65 [2020-12-21 21:43:43,870 INFO L226 Difference]: Without dead ends: 59 [2020-12-21 21:43:43,870 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 26 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=36, Invalid=36, Unknown=0, NotChecked=0, Total=72 [2020-12-21 21:43:43,871 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2020-12-21 21:43:43,876 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 29. [2020-12-21 21:43:43,876 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2020-12-21 21:43:43,876 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 31 transitions. [2020-12-21 21:43:43,877 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 31 transitions. Word has length 26 [2020-12-21 21:43:43,877 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:43:43,877 INFO L481 AbstractCegarLoop]: Abstraction has 29 states and 31 transitions. [2020-12-21 21:43:43,877 INFO L482 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-12-21 21:43:43,877 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 31 transitions. [2020-12-21 21:43:43,878 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-12-21 21:43:43,878 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:43:43,878 INFO L422 BasicCegarLoop]: trace histogram [12, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:43:44,092 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:43:44,093 INFO L429 AbstractCegarLoop]: === Iteration 9 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:43:44,094 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:43:44,094 INFO L82 PathProgramCache]: Analyzing trace with hash 1691862744, now seen corresponding path program 7 times [2020-12-21 21:43:44,095 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:43:44,095 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1878503108] [2020-12-21 21:43:44,095 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:43:44,122 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:43:44,193 INFO L134 CoverageAnalysis]: Checked inductivity of 99 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2020-12-21 21:43:44,194 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1878503108] [2020-12-21 21:43:44,197 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1356693014] [2020-12-21 21:43:44,199 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 21:43:44,288 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:43:44,290 INFO L263 TraceCheckSpWp]: Trace formula consists of 171 conjuncts, 14 conjunts are in the unsatisfiable core [2020-12-21 21:43:44,293 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:43:44,445 INFO L134 CoverageAnalysis]: Checked inductivity of 99 backedges. 0 proven. 78 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-12-21 21:43:44,445 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:43:44,445 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 15] total 21 [2020-12-21 21:43:44,446 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [64699397] [2020-12-21 21:43:44,446 INFO L461 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-12-21 21:43:44,446 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:43:44,447 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-12-21 21:43:44,448 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=209, Invalid=211, Unknown=0, NotChecked=0, Total=420 [2020-12-21 21:43:44,448 INFO L87 Difference]: Start difference. First operand 29 states and 31 transitions. Second operand 21 states. [2020-12-21 21:43:44,580 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:43:44,580 INFO L93 Difference]: Finished difference Result 85 states and 95 transitions. [2020-12-21 21:43:44,581 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-12-21 21:43:44,581 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 27 [2020-12-21 21:43:44,581 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:43:44,582 INFO L225 Difference]: With dead ends: 85 [2020-12-21 21:43:44,582 INFO L226 Difference]: Without dead ends: 71 [2020-12-21 21:43:44,583 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 16 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 181 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=209, Invalid=211, Unknown=0, NotChecked=0, Total=420 [2020-12-21 21:43:44,583 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 71 states. [2020-12-21 21:43:44,588 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 71 to 36. [2020-12-21 21:43:44,588 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-12-21 21:43:44,589 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 38 transitions. [2020-12-21 21:43:44,589 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 38 transitions. Word has length 27 [2020-12-21 21:43:44,589 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:43:44,589 INFO L481 AbstractCegarLoop]: Abstraction has 36 states and 38 transitions. [2020-12-21 21:43:44,589 INFO L482 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-12-21 21:43:44,589 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 38 transitions. [2020-12-21 21:43:44,590 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2020-12-21 21:43:44,590 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:43:44,590 INFO L422 BasicCegarLoop]: trace histogram [18, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:43:44,803 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable8 [2020-12-21 21:43:44,804 INFO L429 AbstractCegarLoop]: === Iteration 10 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:43:44,805 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:43:44,805 INFO L82 PathProgramCache]: Analyzing trace with hash 1563220882, now seen corresponding path program 8 times [2020-12-21 21:43:44,805 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:43:44,806 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1140745869] [2020-12-21 21:43:44,806 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:43:44,837 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:43:44,969 INFO L134 CoverageAnalysis]: Checked inductivity of 199 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 171 trivial. 0 not checked. [2020-12-21 21:43:44,969 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1140745869] [2020-12-21 21:43:44,970 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [984580632] [2020-12-21 21:43:44,970 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 21:43:45,073 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2020-12-21 21:43:45,073 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 21:43:45,075 INFO L263 TraceCheckSpWp]: Trace formula consists of 213 conjuncts, 20 conjunts are in the unsatisfiable core [2020-12-21 21:43:45,077 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:43:45,330 INFO L134 CoverageAnalysis]: Checked inductivity of 199 backedges. 0 proven. 171 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2020-12-21 21:43:45,330 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:43:45,330 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 21] total 27 [2020-12-21 21:43:45,331 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1053429185] [2020-12-21 21:43:45,332 INFO L461 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-12-21 21:43:45,332 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:43:45,333 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-12-21 21:43:45,339 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=350, Invalid=352, Unknown=0, NotChecked=0, Total=702 [2020-12-21 21:43:45,339 INFO L87 Difference]: Start difference. First operand 36 states and 38 transitions. Second operand 27 states. [2020-12-21 21:43:45,516 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:43:45,516 INFO L93 Difference]: Finished difference Result 98 states and 108 transitions. [2020-12-21 21:43:45,517 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2020-12-21 21:43:45,517 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 34 [2020-12-21 21:43:45,518 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:43:45,521 INFO L225 Difference]: With dead ends: 98 [2020-12-21 21:43:45,521 INFO L226 Difference]: Without dead ends: 83 [2020-12-21 21:43:45,523 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 18 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 365 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=350, Invalid=352, Unknown=0, NotChecked=0, Total=702 [2020-12-21 21:43:45,524 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 83 states. [2020-12-21 21:43:45,539 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 83 to 43. [2020-12-21 21:43:45,539 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2020-12-21 21:43:45,543 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 45 transitions. [2020-12-21 21:43:45,544 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 45 transitions. Word has length 34 [2020-12-21 21:43:45,545 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:43:45,546 INFO L481 AbstractCegarLoop]: Abstraction has 43 states and 45 transitions. [2020-12-21 21:43:45,546 INFO L482 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-12-21 21:43:45,546 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 45 transitions. [2020-12-21 21:43:45,549 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-12-21 21:43:45,549 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:43:45,549 INFO L422 BasicCegarLoop]: trace histogram [24, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:43:45,765 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,10 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:43:45,765 INFO L429 AbstractCegarLoop]: === Iteration 11 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:43:45,766 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:43:45,767 INFO L82 PathProgramCache]: Analyzing trace with hash -959154600, now seen corresponding path program 9 times [2020-12-21 21:43:45,767 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:43:45,767 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1943847293] [2020-12-21 21:43:45,767 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:43:45,796 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:43:45,918 INFO L134 CoverageAnalysis]: Checked inductivity of 336 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 300 trivial. 0 not checked. [2020-12-21 21:43:45,919 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1943847293] [2020-12-21 21:43:45,919 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1157713273] [2020-12-21 21:43:45,919 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 21:43:46,145 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2020-12-21 21:43:46,145 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 21:43:46,148 INFO L263 TraceCheckSpWp]: Trace formula consists of 159 conjuncts, 10 conjunts are in the unsatisfiable core [2020-12-21 21:43:46,150 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:43:46,232 INFO L134 CoverageAnalysis]: Checked inductivity of 336 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 300 trivial. 0 not checked. [2020-12-21 21:43:46,233 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:43:46,233 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 12 [2020-12-21 21:43:46,233 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2077188265] [2020-12-21 21:43:46,234 INFO L461 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-12-21 21:43:46,234 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:43:46,234 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-12-21 21:43:46,235 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=66, Invalid=66, Unknown=0, NotChecked=0, Total=132 [2020-12-21 21:43:46,235 INFO L87 Difference]: Start difference. First operand 43 states and 45 transitions. Second operand 12 states. [2020-12-21 21:43:46,323 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:43:46,324 INFO L93 Difference]: Finished difference Result 95 states and 98 transitions. [2020-12-21 21:43:46,324 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-12-21 21:43:46,324 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 41 [2020-12-21 21:43:46,325 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:43:46,325 INFO L225 Difference]: With dead ends: 95 [2020-12-21 21:43:46,325 INFO L226 Difference]: Without dead ends: 89 [2020-12-21 21:43:46,326 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 51 GetRequests, 41 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 21:43:46,326 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 89 states. [2020-12-21 21:43:46,331 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 89 to 44. [2020-12-21 21:43:46,331 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2020-12-21 21:43:46,332 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 46 transitions. [2020-12-21 21:43:46,332 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 46 transitions. Word has length 41 [2020-12-21 21:43:46,332 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:43:46,332 INFO L481 AbstractCegarLoop]: Abstraction has 44 states and 46 transitions. [2020-12-21 21:43:46,332 INFO L482 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-12-21 21:43:46,333 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 46 transitions. [2020-12-21 21:43:46,333 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2020-12-21 21:43:46,333 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:43:46,334 INFO L422 BasicCegarLoop]: trace histogram [24, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:43:46,547 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,11 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:43:46,548 INFO L429 AbstractCegarLoop]: === Iteration 12 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:43:46,549 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:43:46,550 INFO L82 PathProgramCache]: Analyzing trace with hash 382424626, now seen corresponding path program 10 times [2020-12-21 21:43:46,550 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:43:46,550 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [380226326] [2020-12-21 21:43:46,551 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:43:46,579 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:43:46,686 INFO L134 CoverageAnalysis]: Checked inductivity of 345 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 300 trivial. 0 not checked. [2020-12-21 21:43:46,687 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [380226326] [2020-12-21 21:43:46,687 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1342003226] [2020-12-21 21:43:46,687 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 21:43:46,770 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2020-12-21 21:43:46,770 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 21:43:46,772 INFO L263 TraceCheckSpWp]: Trace formula consists of 261 conjuncts, 26 conjunts are in the unsatisfiable core [2020-12-21 21:43:46,775 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:43:47,072 INFO L134 CoverageAnalysis]: Checked inductivity of 345 backedges. 0 proven. 300 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2020-12-21 21:43:47,072 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:43:47,073 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 27] total 34 [2020-12-21 21:43:47,073 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [798888728] [2020-12-21 21:43:47,073 INFO L461 AbstractCegarLoop]: Interpolant automaton has 34 states [2020-12-21 21:43:47,073 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:43:47,074 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2020-12-21 21:43:47,075 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=560, Invalid=562, Unknown=0, NotChecked=0, Total=1122 [2020-12-21 21:43:47,075 INFO L87 Difference]: Start difference. First operand 44 states and 46 transitions. Second operand 34 states. [2020-12-21 21:43:47,262 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:43:47,262 INFO L93 Difference]: Finished difference Result 119 states and 130 transitions. [2020-12-21 21:43:47,263 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2020-12-21 21:43:47,263 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 42 [2020-12-21 21:43:47,263 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:43:47,264 INFO L225 Difference]: With dead ends: 119 [2020-12-21 21:43:47,264 INFO L226 Difference]: Without dead ends: 102 [2020-12-21 21:43:47,265 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 653 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=560, Invalid=562, Unknown=0, NotChecked=0, Total=1122 [2020-12-21 21:43:47,268 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 102 states. [2020-12-21 21:43:47,282 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 102 to 52. [2020-12-21 21:43:47,282 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 52 states. [2020-12-21 21:43:47,283 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 54 transitions. [2020-12-21 21:43:47,283 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 54 transitions. Word has length 42 [2020-12-21 21:43:47,286 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:43:47,286 INFO L481 AbstractCegarLoop]: Abstraction has 52 states and 54 transitions. [2020-12-21 21:43:47,286 INFO L482 AbstractCegarLoop]: Interpolant automaton has 34 states. [2020-12-21 21:43:47,286 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 54 transitions. [2020-12-21 21:43:47,287 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2020-12-21 21:43:47,287 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:43:47,288 INFO L422 BasicCegarLoop]: trace histogram [31, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:43:47,502 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2020-12-21 21:43:47,503 INFO L429 AbstractCegarLoop]: === Iteration 13 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:43:47,503 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:43:47,504 INFO L82 PathProgramCache]: Analyzing trace with hash -420901837, now seen corresponding path program 11 times [2020-12-21 21:43:47,504 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:43:47,505 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [975632884] [2020-12-21 21:43:47,505 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:43:47,540 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:43:47,675 INFO L134 CoverageAnalysis]: Checked inductivity of 551 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 496 trivial. 0 not checked. [2020-12-21 21:43:47,675 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [975632884] [2020-12-21 21:43:47,676 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [84939385] [2020-12-21 21:43:47,677 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 21:45:09,192 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 17 check-sat command(s) [2020-12-21 21:45:09,192 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 21:45:09,321 INFO L263 TraceCheckSpWp]: Trace formula consists of 309 conjuncts, 33 conjunts are in the unsatisfiable core [2020-12-21 21:45:09,331 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:45:09,781 INFO L134 CoverageAnalysis]: Checked inductivity of 551 backedges. 0 proven. 496 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2020-12-21 21:45:09,782 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:45:09,782 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 34] total 40 [2020-12-21 21:45:09,782 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [660211618] [2020-12-21 21:45:09,783 INFO L461 AbstractCegarLoop]: Interpolant automaton has 40 states [2020-12-21 21:45:09,783 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:45:09,784 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2020-12-21 21:45:09,785 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=779, Invalid=781, Unknown=0, NotChecked=0, Total=1560 [2020-12-21 21:45:09,785 INFO L87 Difference]: Start difference. First operand 52 states and 54 transitions. Second operand 40 states. [2020-12-21 21:45:10,026 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:45:10,026 INFO L93 Difference]: Finished difference Result 132 states and 142 transitions. [2020-12-21 21:45:10,027 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2020-12-21 21:45:10,027 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 50 [2020-12-21 21:45:10,027 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:45:10,028 INFO L225 Difference]: With dead ends: 132 [2020-12-21 21:45:10,028 INFO L226 Difference]: Without dead ends: 114 [2020-12-21 21:45:10,030 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 24 SyntacticMatches, 0 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 967 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=779, Invalid=781, Unknown=0, NotChecked=0, Total=1560 [2020-12-21 21:45:10,031 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 114 states. [2020-12-21 21:45:10,046 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 114 to 59. [2020-12-21 21:45:10,047 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 59 states. [2020-12-21 21:45:10,047 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 61 transitions. [2020-12-21 21:45:10,048 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 61 transitions. Word has length 50 [2020-12-21 21:45:10,048 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:45:10,048 INFO L481 AbstractCegarLoop]: Abstraction has 59 states and 61 transitions. [2020-12-21 21:45:10,048 INFO L482 AbstractCegarLoop]: Interpolant automaton has 40 states. [2020-12-21 21:45:10,048 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 61 transitions. [2020-12-21 21:45:10,054 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2020-12-21 21:45:10,055 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:45:10,055 INFO L422 BasicCegarLoop]: trace histogram [37, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:45:10,269 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2020-12-21 21:45:10,270 INFO L429 AbstractCegarLoop]: === Iteration 14 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:45:10,270 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:45:10,271 INFO L82 PathProgramCache]: Analyzing trace with hash -1334994473, now seen corresponding path program 12 times [2020-12-21 21:45:10,271 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:45:10,272 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1770696930] [2020-12-21 21:45:10,272 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:45:10,306 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:45:10,446 INFO L134 CoverageAnalysis]: Checked inductivity of 769 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 703 trivial. 0 not checked. [2020-12-21 21:45:10,446 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1770696930] [2020-12-21 21:45:10,446 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [218500193] [2020-12-21 21:45:10,447 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 21:45:30,989 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 13 check-sat command(s) [2020-12-21 21:45:30,989 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 21:45:31,021 INFO L263 TraceCheckSpWp]: Trace formula consists of 267 conjuncts, 13 conjunts are in the unsatisfiable core [2020-12-21 21:45:31,024 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:45:31,100 INFO L134 CoverageAnalysis]: Checked inductivity of 769 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 703 trivial. 0 not checked. [2020-12-21 21:45:31,101 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:45:31,101 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14] total 15 [2020-12-21 21:45:31,102 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1526223641] [2020-12-21 21:45:31,102 INFO L461 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-12-21 21:45:31,102 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:45:31,103 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-12-21 21:45:31,103 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=105, Invalid=105, Unknown=0, NotChecked=0, Total=210 [2020-12-21 21:45:31,103 INFO L87 Difference]: Start difference. First operand 59 states and 61 transitions. Second operand 15 states. [2020-12-21 21:45:31,218 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:45:31,218 INFO L93 Difference]: Finished difference Result 126 states and 129 transitions. [2020-12-21 21:45:31,218 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-12-21 21:45:31,219 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 57 [2020-12-21 21:45:31,220 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:45:31,221 INFO L225 Difference]: With dead ends: 126 [2020-12-21 21:45:31,221 INFO L226 Difference]: Without dead ends: 120 [2020-12-21 21:45:31,222 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 70 GetRequests, 57 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=105, Invalid=105, Unknown=0, NotChecked=0, Total=210 [2020-12-21 21:45:31,224 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 120 states. [2020-12-21 21:45:31,238 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 120 to 60. [2020-12-21 21:45:31,238 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 60 states. [2020-12-21 21:45:31,239 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 62 transitions. [2020-12-21 21:45:31,239 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 62 transitions. Word has length 57 [2020-12-21 21:45:31,240 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:45:31,241 INFO L481 AbstractCegarLoop]: Abstraction has 60 states and 62 transitions. [2020-12-21 21:45:31,241 INFO L482 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-12-21 21:45:31,241 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 62 transitions. [2020-12-21 21:45:31,242 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2020-12-21 21:45:31,243 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:45:31,243 INFO L422 BasicCegarLoop]: trace histogram [37, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:45:31,444 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2020-12-21 21:45:31,444 INFO L429 AbstractCegarLoop]: === Iteration 15 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:45:31,445 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:45:31,445 INFO L82 PathProgramCache]: Analyzing trace with hash 1616290451, now seen corresponding path program 13 times [2020-12-21 21:45:31,446 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:45:31,446 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [421322402] [2020-12-21 21:45:31,447 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:45:31,481 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:45:31,664 INFO L134 CoverageAnalysis]: Checked inductivity of 781 backedges. 0 proven. 78 refuted. 0 times theorem prover too weak. 703 trivial. 0 not checked. [2020-12-21 21:45:31,664 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [421322402] [2020-12-21 21:45:31,664 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1258709888] [2020-12-21 21:45:31,665 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 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 21:45:31,770 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:45:31,773 INFO L263 TraceCheckSpWp]: Trace formula consists of 357 conjuncts, 39 conjunts are in the unsatisfiable core [2020-12-21 21:45:31,777 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:45:32,186 INFO L134 CoverageAnalysis]: Checked inductivity of 781 backedges. 0 proven. 703 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2020-12-21 21:45:32,186 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:45:32,186 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 40] total 47 [2020-12-21 21:45:32,187 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2088304031] [2020-12-21 21:45:32,187 INFO L461 AbstractCegarLoop]: Interpolant automaton has 47 states [2020-12-21 21:45:32,187 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:45:32,188 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2020-12-21 21:45:32,189 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1080, Invalid=1082, Unknown=0, NotChecked=0, Total=2162 [2020-12-21 21:45:32,189 INFO L87 Difference]: Start difference. First operand 60 states and 62 transitions. Second operand 47 states. [2020-12-21 21:45:32,479 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:45:32,480 INFO L93 Difference]: Finished difference Result 153 states and 164 transitions. [2020-12-21 21:45:32,480 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2020-12-21 21:45:32,480 INFO L78 Accepts]: Start accepts. Automaton has 47 states. Word has length 58 [2020-12-21 21:45:32,481 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:45:32,481 INFO L225 Difference]: With dead ends: 153 [2020-12-21 21:45:32,482 INFO L226 Difference]: Without dead ends: 133 [2020-12-21 21:45:32,483 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 72 GetRequests, 27 SyntacticMatches, 0 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1405 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=1080, Invalid=1082, Unknown=0, NotChecked=0, Total=2162 [2020-12-21 21:45:32,484 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 133 states. [2020-12-21 21:45:32,488 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 133 to 68. [2020-12-21 21:45:32,488 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 68 states. [2020-12-21 21:45:32,489 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 70 transitions. [2020-12-21 21:45:32,489 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 70 transitions. Word has length 58 [2020-12-21 21:45:32,489 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:45:32,489 INFO L481 AbstractCegarLoop]: Abstraction has 68 states and 70 transitions. [2020-12-21 21:45:32,489 INFO L482 AbstractCegarLoop]: Interpolant automaton has 47 states. [2020-12-21 21:45:32,489 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 70 transitions. [2020-12-21 21:45:32,490 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2020-12-21 21:45:32,490 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:45:32,490 INFO L422 BasicCegarLoop]: trace histogram [44, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:45:32,703 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14,15 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:45:32,704 INFO L429 AbstractCegarLoop]: === Iteration 16 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:45:32,704 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:45:32,704 INFO L82 PathProgramCache]: Analyzing trace with hash 1412249074, now seen corresponding path program 14 times [2020-12-21 21:45:32,705 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:45:32,705 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1119864296] [2020-12-21 21:45:32,705 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:45:32,744 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:45:32,910 INFO L134 CoverageAnalysis]: Checked inductivity of 1081 backedges. 0 proven. 91 refuted. 0 times theorem prover too weak. 990 trivial. 0 not checked. [2020-12-21 21:45:32,911 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1119864296] [2020-12-21 21:45:32,911 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1843868840] [2020-12-21 21:45:32,911 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 21:45:33,022 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2020-12-21 21:45:33,023 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 21:45:33,026 INFO L263 TraceCheckSpWp]: Trace formula consists of 405 conjuncts, 46 conjunts are in the unsatisfiable core [2020-12-21 21:45:33,029 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:45:33,580 INFO L134 CoverageAnalysis]: Checked inductivity of 1081 backedges. 0 proven. 990 refuted. 0 times theorem prover too weak. 91 trivial. 0 not checked. [2020-12-21 21:45:33,580 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:45:33,580 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 47] total 54 [2020-12-21 21:45:33,581 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [902877301] [2020-12-21 21:45:33,581 INFO L461 AbstractCegarLoop]: Interpolant automaton has 54 states [2020-12-21 21:45:33,581 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:45:33,582 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 54 interpolants. [2020-12-21 21:45:33,584 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1430, Invalid=1432, Unknown=0, NotChecked=0, Total=2862 [2020-12-21 21:45:33,584 INFO L87 Difference]: Start difference. First operand 68 states and 70 transitions. Second operand 54 states. [2020-12-21 21:45:33,899 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:45:33,899 INFO L93 Difference]: Finished difference Result 167 states and 178 transitions. [2020-12-21 21:45:33,899 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 54 states. [2020-12-21 21:45:33,900 INFO L78 Accepts]: Start accepts. Automaton has 54 states. Word has length 66 [2020-12-21 21:45:33,900 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:45:33,901 INFO L225 Difference]: With dead ends: 167 [2020-12-21 21:45:33,901 INFO L226 Difference]: Without dead ends: 146 [2020-12-21 21:45:33,903 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 81 GetRequests, 29 SyntacticMatches, 0 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1933 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=1430, Invalid=1432, Unknown=0, NotChecked=0, Total=2862 [2020-12-21 21:45:33,903 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 146 states. [2020-12-21 21:45:33,907 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 146 to 76. [2020-12-21 21:45:33,907 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 76 states. [2020-12-21 21:45:33,908 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 78 transitions. [2020-12-21 21:45:33,908 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 78 transitions. Word has length 66 [2020-12-21 21:45:33,908 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:45:33,908 INFO L481 AbstractCegarLoop]: Abstraction has 76 states and 78 transitions. [2020-12-21 21:45:33,909 INFO L482 AbstractCegarLoop]: Interpolant automaton has 54 states. [2020-12-21 21:45:33,909 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 78 transitions. [2020-12-21 21:45:33,909 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2020-12-21 21:45:33,909 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:45:33,909 INFO L422 BasicCegarLoop]: trace histogram [51, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:45:34,122 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2020-12-21 21:45:34,123 INFO L429 AbstractCegarLoop]: === Iteration 17 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:45:34,123 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:45:34,124 INFO L82 PathProgramCache]: Analyzing trace with hash 1809073011, now seen corresponding path program 15 times [2020-12-21 21:45:34,124 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:45:34,124 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1034788873] [2020-12-21 21:45:34,124 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:45:34,182 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:45:34,412 INFO L134 CoverageAnalysis]: Checked inductivity of 1431 backedges. 0 proven. 105 refuted. 0 times theorem prover too weak. 1326 trivial. 0 not checked. [2020-12-21 21:45:34,412 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1034788873] [2020-12-21 21:45:34,413 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [422016073] [2020-12-21 21:45:34,413 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 21:45:36,293 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 8 check-sat command(s) [2020-12-21 21:45:36,293 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 21:45:36,299 INFO L263 TraceCheckSpWp]: Trace formula consists of 231 conjuncts, 16 conjunts are in the unsatisfiable core [2020-12-21 21:45:36,303 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:45:36,397 INFO L134 CoverageAnalysis]: Checked inductivity of 1431 backedges. 0 proven. 105 refuted. 0 times theorem prover too weak. 1326 trivial. 0 not checked. [2020-12-21 21:45:36,398 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:45:36,398 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17] total 18 [2020-12-21 21:45:36,398 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [353105097] [2020-12-21 21:45:36,399 INFO L461 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-12-21 21:45:36,399 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:45:36,399 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-12-21 21:45:36,400 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=153, Invalid=153, Unknown=0, NotChecked=0, Total=306 [2020-12-21 21:45:36,400 INFO L87 Difference]: Start difference. First operand 76 states and 78 transitions. Second operand 18 states. [2020-12-21 21:45:36,535 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:45:36,535 INFO L93 Difference]: Finished difference Result 158 states and 161 transitions. [2020-12-21 21:45:36,536 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-12-21 21:45:36,536 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 74 [2020-12-21 21:45:36,536 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:45:36,537 INFO L225 Difference]: With dead ends: 158 [2020-12-21 21:45:36,537 INFO L226 Difference]: Without dead ends: 152 [2020-12-21 21:45:36,538 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 90 GetRequests, 74 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 21:45:36,538 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 152 states. [2020-12-21 21:45:36,542 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 152 to 77. [2020-12-21 21:45:36,542 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 77 states. [2020-12-21 21:45:36,543 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 79 transitions. [2020-12-21 21:45:36,543 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 79 transitions. Word has length 74 [2020-12-21 21:45:36,543 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:45:36,543 INFO L481 AbstractCegarLoop]: Abstraction has 77 states and 79 transitions. [2020-12-21 21:45:36,543 INFO L482 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-12-21 21:45:36,543 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 79 transitions. [2020-12-21 21:45:36,544 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2020-12-21 21:45:36,544 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:45:36,544 INFO L422 BasicCegarLoop]: trace histogram [51, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:45:36,758 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2020-12-21 21:45:36,759 INFO L429 AbstractCegarLoop]: === Iteration 18 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:45:36,759 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:45:36,760 INFO L82 PathProgramCache]: Analyzing trace with hash 298134647, now seen corresponding path program 16 times [2020-12-21 21:45:36,760 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:45:36,760 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [445982216] [2020-12-21 21:45:36,760 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:45:36,797 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:45:37,026 INFO L134 CoverageAnalysis]: Checked inductivity of 1446 backedges. 0 proven. 120 refuted. 0 times theorem prover too weak. 1326 trivial. 0 not checked. [2020-12-21 21:45:37,026 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [445982216] [2020-12-21 21:45:37,027 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2112736316] [2020-12-21 21:45:37,027 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 21:45:37,149 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2020-12-21 21:45:37,149 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 21:45:37,153 INFO L263 TraceCheckSpWp]: Trace formula consists of 459 conjuncts, 53 conjunts are in the unsatisfiable core [2020-12-21 21:45:37,156 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:45:37,762 INFO L134 CoverageAnalysis]: Checked inductivity of 1446 backedges. 0 proven. 1326 refuted. 0 times theorem prover too weak. 120 trivial. 0 not checked. [2020-12-21 21:45:37,762 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:45:37,763 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 54] total 62 [2020-12-21 21:45:37,763 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [711239095] [2020-12-21 21:45:37,763 INFO L461 AbstractCegarLoop]: Interpolant automaton has 62 states [2020-12-21 21:45:37,764 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:45:37,765 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 62 interpolants. [2020-12-21 21:45:37,766 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1890, Invalid=1892, Unknown=0, NotChecked=0, Total=3782 [2020-12-21 21:45:37,766 INFO L87 Difference]: Start difference. First operand 77 states and 79 transitions. Second operand 62 states. [2020-12-21 21:45:38,129 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:45:38,129 INFO L93 Difference]: Finished difference Result 189 states and 201 transitions. [2020-12-21 21:45:38,130 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 62 states. [2020-12-21 21:45:38,130 INFO L78 Accepts]: Start accepts. Automaton has 62 states. Word has length 75 [2020-12-21 21:45:38,131 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:45:38,132 INFO L225 Difference]: With dead ends: 189 [2020-12-21 21:45:38,132 INFO L226 Difference]: Without dead ends: 166 [2020-12-21 21:45:38,134 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 92 GetRequests, 32 SyntacticMatches, 0 SemanticMatches, 60 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2629 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=1890, Invalid=1892, Unknown=0, NotChecked=0, Total=3782 [2020-12-21 21:45:38,135 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 166 states. [2020-12-21 21:45:38,139 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 166 to 86. [2020-12-21 21:45:38,139 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 86 states. [2020-12-21 21:45:38,140 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 86 states to 86 states and 88 transitions. [2020-12-21 21:45:38,140 INFO L78 Accepts]: Start accepts. Automaton has 86 states and 88 transitions. Word has length 75 [2020-12-21 21:45:38,140 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:45:38,140 INFO L481 AbstractCegarLoop]: Abstraction has 86 states and 88 transitions. [2020-12-21 21:45:38,141 INFO L482 AbstractCegarLoop]: Interpolant automaton has 62 states. [2020-12-21 21:45:38,141 INFO L276 IsEmpty]: Start isEmpty. Operand 86 states and 88 transitions. [2020-12-21 21:45:38,141 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 85 [2020-12-21 21:45:38,141 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:45:38,141 INFO L422 BasicCegarLoop]: trace histogram [59, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:45:38,355 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2020-12-21 21:45:38,355 INFO L429 AbstractCegarLoop]: === Iteration 19 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:45:38,356 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:45:38,356 INFO L82 PathProgramCache]: Analyzing trace with hash 1931527795, now seen corresponding path program 17 times [2020-12-21 21:45:38,357 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:45:38,357 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1873999971] [2020-12-21 21:45:38,357 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:45:38,395 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:45:38,624 INFO L134 CoverageAnalysis]: Checked inductivity of 1906 backedges. 0 proven. 136 refuted. 0 times theorem prover too weak. 1770 trivial. 0 not checked. [2020-12-21 21:45:38,624 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1873999971] [2020-12-21 21:45:38,624 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [320194022] [2020-12-21 21:45:38,625 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