/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/array-examples/sorting_bubblesort_ground-2.i -------------------------------------------------------------------------------- This is Ultimate 0.1.24-fb55353 [2019-11-06 18:40:04,679 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-11-06 18:40:04,682 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-11-06 18:40:04,700 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2019-11-06 18:40:04,701 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2019-11-06 18:40:04,703 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2019-11-06 18:40:04,705 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2019-11-06 18:40:04,715 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2019-11-06 18:40:04,720 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2019-11-06 18:40:04,722 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2019-11-06 18:40:04,724 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2019-11-06 18:40:04,726 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2019-11-06 18:40:04,726 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-11-06 18:40:04,728 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-11-06 18:40:04,730 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-11-06 18:40:04,732 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-11-06 18:40:04,734 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-11-06 18:40:04,735 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-11-06 18:40:04,736 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-11-06 18:40:04,741 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-11-06 18:40:04,746 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-11-06 18:40:04,749 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-11-06 18:40:04,752 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-11-06 18:40:04,753 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-11-06 18:40:04,755 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2019-11-06 18:40:04,760 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2019-11-06 18:40:04,762 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2019-11-06 18:40:04,763 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2019-11-06 18:40:04,764 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2019-11-06 18:40:04,766 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2019-11-06 18:40:04,766 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2019-11-06 18:40:04,767 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2019-11-06 18:40:04,767 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2019-11-06 18:40:04,767 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-11-06 18:40:04,768 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-11-06 18:40:04,768 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-11-06 18:40:04,769 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2019-11-06 18:40:04,803 INFO L113 SettingsManager]: Loading preferences was successful [2019-11-06 18:40:04,807 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-11-06 18:40:04,808 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2019-11-06 18:40:04,809 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2019-11-06 18:40:04,809 INFO L138 SettingsManager]: * Use SBE=true [2019-11-06 18:40:04,809 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-11-06 18:40:04,809 INFO L138 SettingsManager]: * sizeof long=4 [2019-11-06 18:40:04,809 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2019-11-06 18:40:04,810 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-11-06 18:40:04,810 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-11-06 18:40:04,810 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-11-06 18:40:04,810 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-11-06 18:40:04,810 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-11-06 18:40:04,811 INFO L138 SettingsManager]: * sizeof long double=12 [2019-11-06 18:40:04,812 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-11-06 18:40:04,812 INFO L138 SettingsManager]: * Use constant arrays=true [2019-11-06 18:40:04,812 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-11-06 18:40:04,813 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-11-06 18:40:04,813 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-11-06 18:40:04,813 INFO L138 SettingsManager]: * To the following directory=./dump/ [2019-11-06 18:40:04,813 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2019-11-06 18:40:04,813 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-11-06 18:40:04,814 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-11-06 18:40:04,814 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-11-06 18:40:04,814 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-11-06 18:40:04,814 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2019-11-06 18:40:04,815 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-11-06 18:40:04,815 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-11-06 18:40:04,815 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2019-11-06 18:40:05,112 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-11-06 18:40:05,128 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-11-06 18:40:05,131 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-11-06 18:40:05,133 INFO L271 PluginConnector]: Initializing CDTParser... [2019-11-06 18:40:05,133 INFO L275 PluginConnector]: CDTParser initialized [2019-11-06 18:40:05,134 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/array-examples/sorting_bubblesort_ground-2.i [2019-11-06 18:40:05,208 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/241fc5a42/e5483d5f05b042cd80426370bc11c940/FLAG8a419d0de [2019-11-06 18:40:05,679 INFO L306 CDTParser]: Found 1 translation units. [2019-11-06 18:40:05,680 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/array-examples/sorting_bubblesort_ground-2.i [2019-11-06 18:40:05,686 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/241fc5a42/e5483d5f05b042cd80426370bc11c940/FLAG8a419d0de [2019-11-06 18:40:06,051 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/241fc5a42/e5483d5f05b042cd80426370bc11c940 [2019-11-06 18:40:06,060 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-11-06 18:40:06,061 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2019-11-06 18:40:06,062 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-11-06 18:40:06,063 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-11-06 18:40:06,066 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-11-06 18:40:06,067 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.11 06:40:06" (1/1) ... [2019-11-06 18:40:06,070 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@7c131ffe and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 06:40:06, skipping insertion in model container [2019-11-06 18:40:06,070 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.11 06:40:06" (1/1) ... [2019-11-06 18:40:06,078 INFO L142 MainTranslator]: Starting translation in SV-COMP mode [2019-11-06 18:40:06,095 INFO L173 MainTranslator]: Built tables and reachable declarations [2019-11-06 18:40:06,332 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-11-06 18:40:06,336 INFO L188 MainTranslator]: Completed pre-run [2019-11-06 18:40:06,363 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-11-06 18:40:06,476 INFO L192 MainTranslator]: Completed translation [2019-11-06 18:40:06,476 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 06:40:06 WrapperNode [2019-11-06 18:40:06,477 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-11-06 18:40:06,477 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-11-06 18:40:06,478 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-11-06 18:40:06,478 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-11-06 18:40:06,491 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 06:40:06" (1/1) ... [2019-11-06 18:40:06,492 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 06:40:06" (1/1) ... [2019-11-06 18:40:06,499 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 06:40:06" (1/1) ... [2019-11-06 18:40:06,499 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 06:40:06" (1/1) ... [2019-11-06 18:40:06,507 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 06:40:06" (1/1) ... [2019-11-06 18:40:06,516 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 06:40:06" (1/1) ... [2019-11-06 18:40:06,518 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 06:40:06" (1/1) ... [2019-11-06 18:40:06,520 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-11-06 18:40:06,521 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-11-06 18:40:06,521 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-11-06 18:40:06,521 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-11-06 18:40:06,522 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 06:40:06" (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 [2019-11-06 18:40:06,583 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2019-11-06 18:40:06,583 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-11-06 18:40:06,584 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2019-11-06 18:40:06,584 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2019-11-06 18:40:06,584 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2019-11-06 18:40:06,584 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2019-11-06 18:40:06,584 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2019-11-06 18:40:06,584 INFO L130 BoogieDeclarations]: Found specification of procedure main [2019-11-06 18:40:06,584 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2019-11-06 18:40:06,585 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2019-11-06 18:40:06,585 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2019-11-06 18:40:06,585 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2019-11-06 18:40:06,586 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2019-11-06 18:40:06,587 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-11-06 18:40:06,886 INFO L279 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-11-06 18:40:06,886 INFO L284 CfgBuilder]: Removed 5 assume(true) statements. [2019-11-06 18:40:06,888 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.11 06:40:06 BoogieIcfgContainer [2019-11-06 18:40:06,888 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-11-06 18:40:06,890 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-11-06 18:40:06,890 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-11-06 18:40:06,893 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-11-06 18:40:06,893 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 06.11 06:40:06" (1/3) ... [2019-11-06 18:40:06,894 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2587caa0 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.11 06:40:06, skipping insertion in model container [2019-11-06 18:40:06,894 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 06:40:06" (2/3) ... [2019-11-06 18:40:06,895 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2587caa0 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.11 06:40:06, skipping insertion in model container [2019-11-06 18:40:06,895 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.11 06:40:06" (3/3) ... [2019-11-06 18:40:06,896 INFO L109 eAbstractionObserver]: Analyzing ICFG sorting_bubblesort_ground-2.i [2019-11-06 18:40:06,905 INFO L152 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-11-06 18:40:06,916 INFO L164 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-11-06 18:40:06,925 INFO L249 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-11-06 18:40:06,948 INFO L373 AbstractCegarLoop]: Interprodecural is true [2019-11-06 18:40:06,948 INFO L374 AbstractCegarLoop]: Hoare is true [2019-11-06 18:40:06,948 INFO L375 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-11-06 18:40:06,948 INFO L376 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-11-06 18:40:06,948 INFO L377 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-11-06 18:40:06,949 INFO L378 AbstractCegarLoop]: Difference is false [2019-11-06 18:40:06,949 INFO L379 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-11-06 18:40:06,949 INFO L383 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-11-06 18:40:06,964 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states. [2019-11-06 18:40:06,969 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2019-11-06 18:40:06,970 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:40:06,970 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:40:06,972 INFO L410 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:40:06,977 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:40:06,978 INFO L82 PathProgramCache]: Analyzing trace with hash -1296691801, now seen corresponding path program 1 times [2019-11-06 18:40:06,986 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:40:06,986 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [840317995] [2019-11-06 18:40:06,987 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:40:07,069 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:40:07,135 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:40:07,145 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 18:40:07,146 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [840317995] [2019-11-06 18:40:07,147 INFO L218 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-06 18:40:07,147 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2019-11-06 18:40:07,148 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1522035309] [2019-11-06 18:40:07,153 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-11-06 18:40:07,153 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:40:07,165 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-11-06 18:40:07,165 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-11-06 18:40:07,167 INFO L87 Difference]: Start difference. First operand 31 states. Second operand 3 states. [2019-11-06 18:40:07,294 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:40:07,294 INFO L93 Difference]: Finished difference Result 54 states and 75 transitions. [2019-11-06 18:40:07,295 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-11-06 18:40:07,296 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 16 [2019-11-06 18:40:07,297 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:40:07,305 INFO L225 Difference]: With dead ends: 54 [2019-11-06 18:40:07,306 INFO L226 Difference]: Without dead ends: 26 [2019-11-06 18:40:07,309 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-11-06 18:40:07,325 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2019-11-06 18:40:07,345 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2019-11-06 18:40:07,346 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2019-11-06 18:40:07,347 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 31 transitions. [2019-11-06 18:40:07,349 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 31 transitions. Word has length 16 [2019-11-06 18:40:07,350 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:40:07,350 INFO L462 AbstractCegarLoop]: Abstraction has 26 states and 31 transitions. [2019-11-06 18:40:07,350 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-11-06 18:40:07,350 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 31 transitions. [2019-11-06 18:40:07,351 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2019-11-06 18:40:07,351 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:40:07,352 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:40:07,352 INFO L410 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:40:07,352 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:40:07,353 INFO L82 PathProgramCache]: Analyzing trace with hash -1547542812, now seen corresponding path program 1 times [2019-11-06 18:40:07,353 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:40:07,354 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [147770802] [2019-11-06 18:40:07,354 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:40:07,377 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:40:07,441 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:40:07,450 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 18:40:07,450 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [147770802] [2019-11-06 18:40:07,450 INFO L218 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-06 18:40:07,451 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2019-11-06 18:40:07,451 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [51528097] [2019-11-06 18:40:07,456 INFO L442 AbstractCegarLoop]: Interpolant automaton has 4 states [2019-11-06 18:40:07,456 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:40:07,457 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2019-11-06 18:40:07,459 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2019-11-06 18:40:07,459 INFO L87 Difference]: Start difference. First operand 26 states and 31 transitions. Second operand 4 states. [2019-11-06 18:40:07,544 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:40:07,545 INFO L93 Difference]: Finished difference Result 46 states and 56 transitions. [2019-11-06 18:40:07,545 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2019-11-06 18:40:07,545 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 16 [2019-11-06 18:40:07,546 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:40:07,546 INFO L225 Difference]: With dead ends: 46 [2019-11-06 18:40:07,547 INFO L226 Difference]: Without dead ends: 28 [2019-11-06 18:40:07,548 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2019-11-06 18:40:07,548 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2019-11-06 18:40:07,554 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 27. [2019-11-06 18:40:07,554 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2019-11-06 18:40:07,555 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 32 transitions. [2019-11-06 18:40:07,556 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 32 transitions. Word has length 16 [2019-11-06 18:40:07,556 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:40:07,556 INFO L462 AbstractCegarLoop]: Abstraction has 27 states and 32 transitions. [2019-11-06 18:40:07,556 INFO L463 AbstractCegarLoop]: Interpolant automaton has 4 states. [2019-11-06 18:40:07,557 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 32 transitions. [2019-11-06 18:40:07,557 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2019-11-06 18:40:07,558 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:40:07,558 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:40:07,558 INFO L410 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:40:07,558 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:40:07,559 INFO L82 PathProgramCache]: Analyzing trace with hash -1387426810, now seen corresponding path program 1 times [2019-11-06 18:40:07,559 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:40:07,559 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [661528465] [2019-11-06 18:40:07,560 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:40:07,581 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:40:07,630 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:40:07,634 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-11-06 18:40:07,635 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [661528465] [2019-11-06 18:40:07,635 INFO L218 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-06 18:40:07,635 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2019-11-06 18:40:07,635 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2132788572] [2019-11-06 18:40:07,636 INFO L442 AbstractCegarLoop]: Interpolant automaton has 4 states [2019-11-06 18:40:07,636 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:40:07,636 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2019-11-06 18:40:07,637 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2019-11-06 18:40:07,637 INFO L87 Difference]: Start difference. First operand 27 states and 32 transitions. Second operand 4 states. [2019-11-06 18:40:07,712 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:40:07,712 INFO L93 Difference]: Finished difference Result 44 states and 53 transitions. [2019-11-06 18:40:07,712 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2019-11-06 18:40:07,713 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 18 [2019-11-06 18:40:07,713 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:40:07,714 INFO L225 Difference]: With dead ends: 44 [2019-11-06 18:40:07,714 INFO L226 Difference]: Without dead ends: 31 [2019-11-06 18:40:07,715 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2019-11-06 18:40:07,715 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2019-11-06 18:40:07,720 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 31. [2019-11-06 18:40:07,721 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2019-11-06 18:40:07,722 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 38 transitions. [2019-11-06 18:40:07,722 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 38 transitions. Word has length 18 [2019-11-06 18:40:07,722 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:40:07,723 INFO L462 AbstractCegarLoop]: Abstraction has 31 states and 38 transitions. [2019-11-06 18:40:07,723 INFO L463 AbstractCegarLoop]: Interpolant automaton has 4 states. [2019-11-06 18:40:07,723 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 38 transitions. [2019-11-06 18:40:07,724 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2019-11-06 18:40:07,724 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:40:07,724 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:40:07,725 INFO L410 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:40:07,725 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:40:07,725 INFO L82 PathProgramCache]: Analyzing trace with hash 1108929549, now seen corresponding path program 1 times [2019-11-06 18:40:07,725 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:40:07,726 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1113513548] [2019-11-06 18:40:07,726 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:40:07,751 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:40:07,801 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:40:07,805 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-11-06 18:40:07,806 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1113513548] [2019-11-06 18:40:07,806 INFO L218 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-06 18:40:07,806 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2019-11-06 18:40:07,806 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1956398923] [2019-11-06 18:40:07,807 INFO L442 AbstractCegarLoop]: Interpolant automaton has 4 states [2019-11-06 18:40:07,807 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:40:07,808 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2019-11-06 18:40:07,808 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2019-11-06 18:40:07,808 INFO L87 Difference]: Start difference. First operand 31 states and 38 transitions. Second operand 4 states. [2019-11-06 18:40:07,889 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:40:07,890 INFO L93 Difference]: Finished difference Result 56 states and 71 transitions. [2019-11-06 18:40:07,890 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2019-11-06 18:40:07,890 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 20 [2019-11-06 18:40:07,891 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:40:07,891 INFO L225 Difference]: With dead ends: 56 [2019-11-06 18:40:07,892 INFO L226 Difference]: Without dead ends: 35 [2019-11-06 18:40:07,892 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2019-11-06 18:40:07,893 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2019-11-06 18:40:07,897 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 32. [2019-11-06 18:40:07,898 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2019-11-06 18:40:07,899 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 39 transitions. [2019-11-06 18:40:07,899 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 39 transitions. Word has length 20 [2019-11-06 18:40:07,900 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:40:07,900 INFO L462 AbstractCegarLoop]: Abstraction has 32 states and 39 transitions. [2019-11-06 18:40:07,900 INFO L463 AbstractCegarLoop]: Interpolant automaton has 4 states. [2019-11-06 18:40:07,900 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 39 transitions. [2019-11-06 18:40:07,901 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2019-11-06 18:40:07,901 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:40:07,901 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:40:07,901 INFO L410 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:40:07,902 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:40:07,902 INFO L82 PathProgramCache]: Analyzing trace with hash -2055572838, now seen corresponding path program 1 times [2019-11-06 18:40:07,902 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:40:07,903 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [641955684] [2019-11-06 18:40:07,903 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:40:07,944 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:40:08,023 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:40:08,026 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2019-11-06 18:40:08,027 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [641955684] [2019-11-06 18:40:08,027 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [861382794] [2019-11-06 18:40:08,027 INFO L94 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 [2019-11-06 18:40:08,078 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:40:08,080 INFO L256 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 3 conjunts are in the unsatisfiable core [2019-11-06 18:40:08,086 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:40:08,136 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2019-11-06 18:40:08,137 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:40:08,137 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 4] total 6 [2019-11-06 18:40:08,137 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [632361390] [2019-11-06 18:40:08,138 INFO L442 AbstractCegarLoop]: Interpolant automaton has 6 states [2019-11-06 18:40:08,138 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:40:08,138 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2019-11-06 18:40:08,138 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2019-11-06 18:40:08,139 INFO L87 Difference]: Start difference. First operand 32 states and 39 transitions. Second operand 6 states. [2019-11-06 18:40:08,222 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:40:08,222 INFO L93 Difference]: Finished difference Result 58 states and 72 transitions. [2019-11-06 18:40:08,223 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2019-11-06 18:40:08,223 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 23 [2019-11-06 18:40:08,223 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:40:08,225 INFO L225 Difference]: With dead ends: 58 [2019-11-06 18:40:08,226 INFO L226 Difference]: Without dead ends: 35 [2019-11-06 18:40:08,226 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 24 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2019-11-06 18:40:08,227 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2019-11-06 18:40:08,232 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 34. [2019-11-06 18:40:08,233 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2019-11-06 18:40:08,234 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 41 transitions. [2019-11-06 18:40:08,235 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 41 transitions. Word has length 23 [2019-11-06 18:40:08,236 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:40:08,236 INFO L462 AbstractCegarLoop]: Abstraction has 34 states and 41 transitions. [2019-11-06 18:40:08,236 INFO L463 AbstractCegarLoop]: Interpolant automaton has 6 states. [2019-11-06 18:40:08,236 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 41 transitions. [2019-11-06 18:40:08,237 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2019-11-06 18:40:08,237 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:40:08,237 INFO L410 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:40:08,438 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:40:08,438 INFO L410 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:40:08,439 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:40:08,439 INFO L82 PathProgramCache]: Analyzing trace with hash 442145592, now seen corresponding path program 2 times [2019-11-06 18:40:08,440 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:40:08,440 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1356876529] [2019-11-06 18:40:08,440 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:40:08,479 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:40:08,538 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:40:08,544 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2019-11-06 18:40:08,544 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1356876529] [2019-11-06 18:40:08,546 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1705578074] [2019-11-06 18:40:08,546 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 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 [2019-11-06 18:40:08,599 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-11-06 18:40:08,599 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 18:40:08,600 INFO L256 TraceCheckSpWp]: Trace formula consists of 87 conjuncts, 4 conjunts are in the unsatisfiable core [2019-11-06 18:40:08,602 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:40:08,620 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2019-11-06 18:40:08,621 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:40:08,622 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5] total 7 [2019-11-06 18:40:08,622 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [629796328] [2019-11-06 18:40:08,623 INFO L442 AbstractCegarLoop]: Interpolant automaton has 7 states [2019-11-06 18:40:08,623 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:40:08,623 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2019-11-06 18:40:08,623 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2019-11-06 18:40:08,626 INFO L87 Difference]: Start difference. First operand 34 states and 41 transitions. Second operand 7 states. [2019-11-06 18:40:08,710 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:40:08,710 INFO L93 Difference]: Finished difference Result 60 states and 74 transitions. [2019-11-06 18:40:08,712 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2019-11-06 18:40:08,712 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 25 [2019-11-06 18:40:08,713 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:40:08,713 INFO L225 Difference]: With dead ends: 60 [2019-11-06 18:40:08,713 INFO L226 Difference]: Without dead ends: 37 [2019-11-06 18:40:08,714 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 26 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2019-11-06 18:40:08,714 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2019-11-06 18:40:08,720 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 36. [2019-11-06 18:40:08,720 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2019-11-06 18:40:08,721 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 43 transitions. [2019-11-06 18:40:08,721 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 43 transitions. Word has length 25 [2019-11-06 18:40:08,721 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:40:08,721 INFO L462 AbstractCegarLoop]: Abstraction has 36 states and 43 transitions. [2019-11-06 18:40:08,722 INFO L463 AbstractCegarLoop]: Interpolant automaton has 7 states. [2019-11-06 18:40:08,722 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 43 transitions. [2019-11-06 18:40:08,722 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2019-11-06 18:40:08,723 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:40:08,723 INFO L410 BasicCegarLoop]: trace histogram [3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:40:08,926 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:40:08,927 INFO L410 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:40:08,928 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:40:08,928 INFO L82 PathProgramCache]: Analyzing trace with hash -137161642, now seen corresponding path program 3 times [2019-11-06 18:40:08,929 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:40:08,929 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1455626548] [2019-11-06 18:40:08,930 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:40:08,951 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:40:09,010 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:40:09,016 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2019-11-06 18:40:09,016 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1455626548] [2019-11-06 18:40:09,017 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1045511439] [2019-11-06 18:40:09,017 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 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 [2019-11-06 18:40:09,059 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2019-11-06 18:40:09,060 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 18:40:09,060 INFO L256 TraceCheckSpWp]: Trace formula consists of 87 conjuncts, 3 conjunts are in the unsatisfiable core [2019-11-06 18:40:09,065 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:40:09,090 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2019-11-06 18:40:09,091 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:40:09,091 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 4] total 9 [2019-11-06 18:40:09,091 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1922727672] [2019-11-06 18:40:09,092 INFO L442 AbstractCegarLoop]: Interpolant automaton has 9 states [2019-11-06 18:40:09,092 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:40:09,092 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2019-11-06 18:40:09,092 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2019-11-06 18:40:09,094 INFO L87 Difference]: Start difference. First operand 36 states and 43 transitions. Second operand 9 states. [2019-11-06 18:40:09,222 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:40:09,222 INFO L93 Difference]: Finished difference Result 71 states and 90 transitions. [2019-11-06 18:40:09,223 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2019-11-06 18:40:09,223 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 27 [2019-11-06 18:40:09,223 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:40:09,224 INFO L225 Difference]: With dead ends: 71 [2019-11-06 18:40:09,224 INFO L226 Difference]: Without dead ends: 48 [2019-11-06 18:40:09,224 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 27 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2019-11-06 18:40:09,226 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2019-11-06 18:40:09,234 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 43. [2019-11-06 18:40:09,235 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2019-11-06 18:40:09,236 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 51 transitions. [2019-11-06 18:40:09,236 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 51 transitions. Word has length 27 [2019-11-06 18:40:09,237 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:40:09,237 INFO L462 AbstractCegarLoop]: Abstraction has 43 states and 51 transitions. [2019-11-06 18:40:09,237 INFO L463 AbstractCegarLoop]: Interpolant automaton has 9 states. [2019-11-06 18:40:09,238 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 51 transitions. [2019-11-06 18:40:09,238 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2019-11-06 18:40:09,239 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:40:09,239 INFO L410 BasicCegarLoop]: trace histogram [4, 4, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:40:09,445 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:40:09,445 INFO L410 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:40:09,446 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:40:09,446 INFO L82 PathProgramCache]: Analyzing trace with hash -890436781, now seen corresponding path program 4 times [2019-11-06 18:40:09,446 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:40:09,447 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [394481774] [2019-11-06 18:40:09,447 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:40:09,476 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:40:09,549 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:40:09,552 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2019-11-06 18:40:09,553 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [394481774] [2019-11-06 18:40:09,553 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [801732504] [2019-11-06 18:40:09,553 INFO L92 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 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 [2019-11-06 18:40:09,604 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-11-06 18:40:09,604 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 18:40:09,605 INFO L256 TraceCheckSpWp]: Trace formula consists of 107 conjuncts, 6 conjunts are in the unsatisfiable core [2019-11-06 18:40:09,607 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:40:09,634 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2019-11-06 18:40:09,634 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:40:09,635 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7] total 9 [2019-11-06 18:40:09,635 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [840015751] [2019-11-06 18:40:09,637 INFO L442 AbstractCegarLoop]: Interpolant automaton has 9 states [2019-11-06 18:40:09,637 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:40:09,637 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2019-11-06 18:40:09,638 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=42, Unknown=0, NotChecked=0, Total=72 [2019-11-06 18:40:09,638 INFO L87 Difference]: Start difference. First operand 43 states and 51 transitions. Second operand 9 states. [2019-11-06 18:40:09,748 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:40:09,749 INFO L93 Difference]: Finished difference Result 74 states and 90 transitions. [2019-11-06 18:40:09,749 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2019-11-06 18:40:09,749 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 32 [2019-11-06 18:40:09,749 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:40:09,750 INFO L225 Difference]: With dead ends: 74 [2019-11-06 18:40:09,750 INFO L226 Difference]: Without dead ends: 46 [2019-11-06 18:40:09,751 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 33 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=30, Invalid=42, Unknown=0, NotChecked=0, Total=72 [2019-11-06 18:40:09,751 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2019-11-06 18:40:09,756 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 45. [2019-11-06 18:40:09,756 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2019-11-06 18:40:09,757 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 53 transitions. [2019-11-06 18:40:09,757 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 53 transitions. Word has length 32 [2019-11-06 18:40:09,757 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:40:09,757 INFO L462 AbstractCegarLoop]: Abstraction has 45 states and 53 transitions. [2019-11-06 18:40:09,757 INFO L463 AbstractCegarLoop]: Interpolant automaton has 9 states. [2019-11-06 18:40:09,757 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 53 transitions. [2019-11-06 18:40:09,758 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2019-11-06 18:40:09,759 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:40:09,759 INFO L410 BasicCegarLoop]: trace histogram [5, 5, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:40:09,968 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:40:09,969 INFO L410 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:40:09,969 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:40:09,970 INFO L82 PathProgramCache]: Analyzing trace with hash -250762123, now seen corresponding path program 5 times [2019-11-06 18:40:09,970 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:40:09,971 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [610643473] [2019-11-06 18:40:09,971 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:40:09,994 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:40:10,058 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:40:10,061 INFO L134 CoverageAnalysis]: Checked inductivity of 31 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2019-11-06 18:40:10,061 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [610643473] [2019-11-06 18:40:10,061 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1752959227] [2019-11-06 18:40:10,061 INFO L92 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 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 [2019-11-06 18:40:10,101 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 5 check-sat command(s) [2019-11-06 18:40:10,102 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 18:40:10,102 INFO L256 TraceCheckSpWp]: Trace formula consists of 54 conjuncts, 4 conjunts are in the unsatisfiable core [2019-11-06 18:40:10,105 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:40:10,153 INFO L134 CoverageAnalysis]: Checked inductivity of 31 backedges. 1 proven. 5 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2019-11-06 18:40:10,156 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:40:10,156 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 5] total 12 [2019-11-06 18:40:10,157 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1869229103] [2019-11-06 18:40:10,157 INFO L442 AbstractCegarLoop]: Interpolant automaton has 12 states [2019-11-06 18:40:10,157 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:40:10,158 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2019-11-06 18:40:10,158 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=93, Unknown=0, NotChecked=0, Total=132 [2019-11-06 18:40:10,158 INFO L87 Difference]: Start difference. First operand 45 states and 53 transitions. Second operand 12 states. [2019-11-06 18:40:10,279 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:40:10,279 INFO L93 Difference]: Finished difference Result 86 states and 108 transitions. [2019-11-06 18:40:10,280 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2019-11-06 18:40:10,280 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 34 [2019-11-06 18:40:10,280 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:40:10,281 INFO L225 Difference]: With dead ends: 86 [2019-11-06 18:40:10,281 INFO L226 Difference]: Without dead ends: 58 [2019-11-06 18:40:10,282 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 33 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=39, Invalid=93, Unknown=0, NotChecked=0, Total=132 [2019-11-06 18:40:10,282 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2019-11-06 18:40:10,290 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 53. [2019-11-06 18:40:10,291 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53 states. [2019-11-06 18:40:10,294 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 63 transitions. [2019-11-06 18:40:10,295 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 63 transitions. Word has length 34 [2019-11-06 18:40:10,295 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:40:10,295 INFO L462 AbstractCegarLoop]: Abstraction has 53 states and 63 transitions. [2019-11-06 18:40:10,296 INFO L463 AbstractCegarLoop]: Interpolant automaton has 12 states. [2019-11-06 18:40:10,296 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 63 transitions. [2019-11-06 18:40:10,297 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2019-11-06 18:40:10,297 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:40:10,297 INFO L410 BasicCegarLoop]: trace histogram [6, 6, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:40:10,498 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:40:10,498 INFO L410 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:40:10,498 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:40:10,499 INFO L82 PathProgramCache]: Analyzing trace with hash -1537034928, now seen corresponding path program 6 times [2019-11-06 18:40:10,499 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:40:10,499 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1589275684] [2019-11-06 18:40:10,499 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:40:10,534 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:40:10,624 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:40:10,629 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2019-11-06 18:40:10,629 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1589275684] [2019-11-06 18:40:10,629 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1054265224] [2019-11-06 18:40:10,629 INFO L92 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE 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 [2019-11-06 18:40:10,687 INFO L249 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2019-11-06 18:40:10,688 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 18:40:10,688 INFO L256 TraceCheckSpWp]: Trace formula consists of 127 conjuncts, 5 conjunts are in the unsatisfiable core [2019-11-06 18:40:10,691 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:40:10,741 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 1 proven. 12 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2019-11-06 18:40:10,742 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:40:10,742 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 6] total 14 [2019-11-06 18:40:10,742 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [804947284] [2019-11-06 18:40:10,742 INFO L442 AbstractCegarLoop]: Interpolant automaton has 14 states [2019-11-06 18:40:10,744 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:40:10,744 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2019-11-06 18:40:10,745 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=52, Invalid=130, Unknown=0, NotChecked=0, Total=182 [2019-11-06 18:40:10,745 INFO L87 Difference]: Start difference. First operand 53 states and 63 transitions. Second operand 14 states. [2019-11-06 18:40:10,897 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:40:10,897 INFO L93 Difference]: Finished difference Result 100 states and 126 transitions. [2019-11-06 18:40:10,897 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2019-11-06 18:40:10,898 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 39 [2019-11-06 18:40:10,898 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:40:10,899 INFO L225 Difference]: With dead ends: 100 [2019-11-06 18:40:10,899 INFO L226 Difference]: Without dead ends: 66 [2019-11-06 18:40:10,900 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 37 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=52, Invalid=130, Unknown=0, NotChecked=0, Total=182 [2019-11-06 18:40:10,901 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2019-11-06 18:40:10,912 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 61. [2019-11-06 18:40:10,912 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2019-11-06 18:40:10,915 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 73 transitions. [2019-11-06 18:40:10,915 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 73 transitions. Word has length 39 [2019-11-06 18:40:10,915 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:40:10,915 INFO L462 AbstractCegarLoop]: Abstraction has 61 states and 73 transitions. [2019-11-06 18:40:10,916 INFO L463 AbstractCegarLoop]: Interpolant automaton has 14 states. [2019-11-06 18:40:10,916 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 73 transitions. [2019-11-06 18:40:10,917 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2019-11-06 18:40:10,917 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:40:10,918 INFO L410 BasicCegarLoop]: trace histogram [7, 7, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:40:11,119 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:40:11,120 INFO L410 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:40:11,120 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:40:11,120 INFO L82 PathProgramCache]: Analyzing trace with hash 747611417, now seen corresponding path program 7 times [2019-11-06 18:40:11,120 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:40:11,121 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1385969669] [2019-11-06 18:40:11,121 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:40:11,142 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:40:11,240 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:40:11,250 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 49 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2019-11-06 18:40:11,250 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1385969669] [2019-11-06 18:40:11,250 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [853278956] [2019-11-06 18:40:11,250 INFO L92 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY 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 [2019-11-06 18:40:11,307 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:40:11,308 INFO L256 TraceCheckSpWp]: Trace formula consists of 141 conjuncts, 9 conjunts are in the unsatisfiable core [2019-11-06 18:40:11,311 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:40:11,337 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 49 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2019-11-06 18:40:11,338 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:40:11,338 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 10] total 12 [2019-11-06 18:40:11,338 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1117405995] [2019-11-06 18:40:11,339 INFO L442 AbstractCegarLoop]: Interpolant automaton has 12 states [2019-11-06 18:40:11,339 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:40:11,339 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2019-11-06 18:40:11,339 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=75, Unknown=0, NotChecked=0, Total=132 [2019-11-06 18:40:11,340 INFO L87 Difference]: Start difference. First operand 61 states and 73 transitions. Second operand 12 states. [2019-11-06 18:40:11,410 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:40:11,410 INFO L93 Difference]: Finished difference Result 104 states and 128 transitions. [2019-11-06 18:40:11,411 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2019-11-06 18:40:11,411 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 44 [2019-11-06 18:40:11,411 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:40:11,412 INFO L225 Difference]: With dead ends: 104 [2019-11-06 18:40:11,412 INFO L226 Difference]: Without dead ends: 64 [2019-11-06 18:40:11,413 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 45 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=57, Invalid=75, Unknown=0, NotChecked=0, Total=132 [2019-11-06 18:40:11,413 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2019-11-06 18:40:11,418 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 63. [2019-11-06 18:40:11,421 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 63 states. [2019-11-06 18:40:11,422 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 75 transitions. [2019-11-06 18:40:11,422 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 75 transitions. Word has length 44 [2019-11-06 18:40:11,422 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:40:11,422 INFO L462 AbstractCegarLoop]: Abstraction has 63 states and 75 transitions. [2019-11-06 18:40:11,422 INFO L463 AbstractCegarLoop]: Interpolant automaton has 12 states. [2019-11-06 18:40:11,423 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 75 transitions. [2019-11-06 18:40:11,423 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2019-11-06 18:40:11,423 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:40:11,424 INFO L410 BasicCegarLoop]: trace histogram [8, 8, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:40:11,633 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:40:11,634 INFO L410 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:40:11,634 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:40:11,634 INFO L82 PathProgramCache]: Analyzing trace with hash 1331800891, now seen corresponding path program 8 times [2019-11-06 18:40:11,635 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:40:11,635 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [714420054] [2019-11-06 18:40:11,635 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:40:11,659 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:40:11,768 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:40:11,771 INFO L134 CoverageAnalysis]: Checked inductivity of 87 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2019-11-06 18:40:11,772 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [714420054] [2019-11-06 18:40:11,772 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1309662893] [2019-11-06 18:40:11,772 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 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 [2019-11-06 18:40:11,825 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-11-06 18:40:11,825 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 18:40:11,829 INFO L256 TraceCheckSpWp]: Trace formula consists of 147 conjuncts, 10 conjunts are in the unsatisfiable core [2019-11-06 18:40:11,836 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:40:11,869 INFO L134 CoverageAnalysis]: Checked inductivity of 87 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2019-11-06 18:40:11,870 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:40:11,870 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 11] total 13 [2019-11-06 18:40:11,870 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1613502334] [2019-11-06 18:40:11,871 INFO L442 AbstractCegarLoop]: Interpolant automaton has 13 states [2019-11-06 18:40:11,871 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:40:11,871 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2019-11-06 18:40:11,872 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=88, Unknown=0, NotChecked=0, Total=156 [2019-11-06 18:40:11,872 INFO L87 Difference]: Start difference. First operand 63 states and 75 transitions. Second operand 13 states. [2019-11-06 18:40:11,958 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:40:11,958 INFO L93 Difference]: Finished difference Result 106 states and 130 transitions. [2019-11-06 18:40:11,958 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2019-11-06 18:40:11,958 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 46 [2019-11-06 18:40:11,959 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:40:11,959 INFO L225 Difference]: With dead ends: 106 [2019-11-06 18:40:11,959 INFO L226 Difference]: Without dead ends: 66 [2019-11-06 18:40:11,960 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 47 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=68, Invalid=88, Unknown=0, NotChecked=0, Total=156 [2019-11-06 18:40:11,961 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2019-11-06 18:40:11,965 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 65. [2019-11-06 18:40:11,966 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 65 states. [2019-11-06 18:40:11,966 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 77 transitions. [2019-11-06 18:40:11,967 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 77 transitions. Word has length 46 [2019-11-06 18:40:11,967 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:40:11,967 INFO L462 AbstractCegarLoop]: Abstraction has 65 states and 77 transitions. [2019-11-06 18:40:11,967 INFO L463 AbstractCegarLoop]: Interpolant automaton has 13 states. [2019-11-06 18:40:11,967 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 77 transitions. [2019-11-06 18:40:11,968 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2019-11-06 18:40:11,968 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:40:11,968 INFO L410 BasicCegarLoop]: trace histogram [9, 9, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:40:12,172 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:40:12,172 INFO L410 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:40:12,172 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:40:12,172 INFO L82 PathProgramCache]: Analyzing trace with hash 97169629, now seen corresponding path program 9 times [2019-11-06 18:40:12,173 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:40:12,173 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [709240193] [2019-11-06 18:40:12,173 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:40:12,195 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:40:12,296 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:40:12,300 INFO L134 CoverageAnalysis]: Checked inductivity of 104 backedges. 0 proven. 81 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2019-11-06 18:40:12,301 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [709240193] [2019-11-06 18:40:12,301 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [396306651] [2019-11-06 18:40:12,301 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 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 [2019-11-06 18:40:12,369 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2019-11-06 18:40:12,370 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 18:40:12,371 INFO L256 TraceCheckSpWp]: Trace formula consists of 129 conjuncts, 6 conjunts are in the unsatisfiable core [2019-11-06 18:40:12,373 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:40:12,465 INFO L134 CoverageAnalysis]: Checked inductivity of 104 backedges. 1 proven. 22 refuted. 0 times theorem prover too weak. 81 trivial. 0 not checked. [2019-11-06 18:40:12,465 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:40:12,466 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 7] total 18 [2019-11-06 18:40:12,466 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [313866772] [2019-11-06 18:40:12,466 INFO L442 AbstractCegarLoop]: Interpolant automaton has 18 states [2019-11-06 18:40:12,466 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:40:12,467 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2019-11-06 18:40:12,467 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=88, Invalid=218, Unknown=0, NotChecked=0, Total=306 [2019-11-06 18:40:12,467 INFO L87 Difference]: Start difference. First operand 65 states and 77 transitions. Second operand 18 states. [2019-11-06 18:40:12,634 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:40:12,635 INFO L93 Difference]: Finished difference Result 118 states and 148 transitions. [2019-11-06 18:40:12,635 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2019-11-06 18:40:12,635 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 48 [2019-11-06 18:40:12,636 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:40:12,636 INFO L225 Difference]: With dead ends: 118 [2019-11-06 18:40:12,637 INFO L226 Difference]: Without dead ends: 78 [2019-11-06 18:40:12,637 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 45 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 54 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=88, Invalid=218, Unknown=0, NotChecked=0, Total=306 [2019-11-06 18:40:12,638 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2019-11-06 18:40:12,643 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 73. [2019-11-06 18:40:12,643 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 73 states. [2019-11-06 18:40:12,643 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 87 transitions. [2019-11-06 18:40:12,644 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 87 transitions. Word has length 48 [2019-11-06 18:40:12,644 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:40:12,644 INFO L462 AbstractCegarLoop]: Abstraction has 73 states and 87 transitions. [2019-11-06 18:40:12,644 INFO L463 AbstractCegarLoop]: Interpolant automaton has 18 states. [2019-11-06 18:40:12,644 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 87 transitions. [2019-11-06 18:40:12,645 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2019-11-06 18:40:12,645 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:40:12,645 INFO L410 BasicCegarLoop]: trace histogram [10, 10, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:40:12,850 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:40:12,851 INFO L410 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:40:12,851 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:40:12,851 INFO L82 PathProgramCache]: Analyzing trace with hash 830729064, now seen corresponding path program 10 times [2019-11-06 18:40:12,852 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:40:12,852 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [395426575] [2019-11-06 18:40:12,852 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:40:12,894 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:40:13,016 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:40:13,021 INFO L134 CoverageAnalysis]: Checked inductivity of 136 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2019-11-06 18:40:13,021 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [395426575] [2019-11-06 18:40:13,022 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [504767079] [2019-11-06 18:40:13,022 INFO L92 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 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 [2019-11-06 18:40:13,073 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-11-06 18:40:13,073 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 18:40:13,074 INFO L256 TraceCheckSpWp]: Trace formula consists of 167 conjuncts, 12 conjunts are in the unsatisfiable core [2019-11-06 18:40:13,076 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:40:13,116 INFO L134 CoverageAnalysis]: Checked inductivity of 136 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2019-11-06 18:40:13,116 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:40:13,117 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13] total 15 [2019-11-06 18:40:13,117 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [84911051] [2019-11-06 18:40:13,117 INFO L442 AbstractCegarLoop]: Interpolant automaton has 15 states [2019-11-06 18:40:13,118 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:40:13,118 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2019-11-06 18:40:13,118 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=117, Unknown=0, NotChecked=0, Total=210 [2019-11-06 18:40:13,119 INFO L87 Difference]: Start difference. First operand 73 states and 87 transitions. Second operand 15 states. [2019-11-06 18:40:13,232 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:40:13,232 INFO L93 Difference]: Finished difference Result 122 states and 150 transitions. [2019-11-06 18:40:13,232 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2019-11-06 18:40:13,232 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 53 [2019-11-06 18:40:13,232 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:40:13,233 INFO L225 Difference]: With dead ends: 122 [2019-11-06 18:40:13,233 INFO L226 Difference]: Without dead ends: 76 [2019-11-06 18:40:13,234 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 67 GetRequests, 54 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=93, Invalid=117, Unknown=0, NotChecked=0, Total=210 [2019-11-06 18:40:13,234 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2019-11-06 18:40:13,239 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 75. [2019-11-06 18:40:13,239 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 75 states. [2019-11-06 18:40:13,240 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 89 transitions. [2019-11-06 18:40:13,240 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 89 transitions. Word has length 53 [2019-11-06 18:40:13,240 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:40:13,240 INFO L462 AbstractCegarLoop]: Abstraction has 75 states and 89 transitions. [2019-11-06 18:40:13,240 INFO L463 AbstractCegarLoop]: Interpolant automaton has 15 states. [2019-11-06 18:40:13,241 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 89 transitions. [2019-11-06 18:40:13,241 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2019-11-06 18:40:13,241 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:40:13,242 INFO L410 BasicCegarLoop]: trace histogram [11, 11, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:40:13,442 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:40:13,442 INFO L410 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:40:13,443 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:40:13,443 INFO L82 PathProgramCache]: Analyzing trace with hash 1163504518, now seen corresponding path program 11 times [2019-11-06 18:40:13,443 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:40:13,443 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1854263830] [2019-11-06 18:40:13,443 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:40:13,457 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:40:13,596 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:40:13,601 INFO L134 CoverageAnalysis]: Checked inductivity of 157 backedges. 0 proven. 121 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2019-11-06 18:40:13,602 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1854263830] [2019-11-06 18:40:13,602 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [808546994] [2019-11-06 18:40:13,602 INFO L92 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 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 [2019-11-06 18:40:13,698 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 11 check-sat command(s) [2019-11-06 18:40:13,698 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 18:40:13,699 INFO L256 TraceCheckSpWp]: Trace formula consists of 114 conjuncts, 7 conjunts are in the unsatisfiable core [2019-11-06 18:40:13,703 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:40:13,799 INFO L134 CoverageAnalysis]: Checked inductivity of 157 backedges. 1 proven. 35 refuted. 0 times theorem prover too weak. 121 trivial. 0 not checked. [2019-11-06 18:40:13,799 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:40:13,799 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 8] total 21 [2019-11-06 18:40:13,800 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [387628574] [2019-11-06 18:40:13,800 INFO L442 AbstractCegarLoop]: Interpolant automaton has 21 states [2019-11-06 18:40:13,800 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:40:13,801 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2019-11-06 18:40:13,801 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=120, Invalid=300, Unknown=0, NotChecked=0, Total=420 [2019-11-06 18:40:13,801 INFO L87 Difference]: Start difference. First operand 75 states and 89 transitions. Second operand 21 states. [2019-11-06 18:40:13,970 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:40:13,970 INFO L93 Difference]: Finished difference Result 134 states and 168 transitions. [2019-11-06 18:40:13,970 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2019-11-06 18:40:13,971 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 55 [2019-11-06 18:40:13,971 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:40:13,972 INFO L225 Difference]: With dead ends: 134 [2019-11-06 18:40:13,972 INFO L226 Difference]: Without dead ends: 88 [2019-11-06 18:40:13,973 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 70 GetRequests, 51 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 77 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=120, Invalid=300, Unknown=0, NotChecked=0, Total=420 [2019-11-06 18:40:13,974 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2019-11-06 18:40:13,979 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 83. [2019-11-06 18:40:13,979 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 83 states. [2019-11-06 18:40:13,980 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 99 transitions. [2019-11-06 18:40:13,980 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 99 transitions. Word has length 55 [2019-11-06 18:40:13,980 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:40:13,980 INFO L462 AbstractCegarLoop]: Abstraction has 83 states and 99 transitions. [2019-11-06 18:40:13,980 INFO L463 AbstractCegarLoop]: Interpolant automaton has 21 states. [2019-11-06 18:40:13,980 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 99 transitions. [2019-11-06 18:40:13,981 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2019-11-06 18:40:13,981 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:40:13,981 INFO L410 BasicCegarLoop]: trace histogram [12, 12, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:40:14,185 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:40:14,186 INFO L410 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:40:14,186 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:40:14,187 INFO L82 PathProgramCache]: Analyzing trace with hash -264767709, now seen corresponding path program 12 times [2019-11-06 18:40:14,187 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:40:14,187 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1725324092] [2019-11-06 18:40:14,188 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:40:14,204 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:40:14,337 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:40:14,342 INFO L134 CoverageAnalysis]: Checked inductivity of 196 backedges. 0 proven. 144 refuted. 0 times theorem prover too weak. 52 trivial. 0 not checked. [2019-11-06 18:40:14,342 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1725324092] [2019-11-06 18:40:14,342 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [298112159] [2019-11-06 18:40:14,343 INFO L92 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE 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 [2019-11-06 18:40:14,493 INFO L249 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 13 check-sat command(s) [2019-11-06 18:40:14,494 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 18:40:14,495 INFO L256 TraceCheckSpWp]: Trace formula consists of 187 conjuncts, 8 conjunts are in the unsatisfiable core [2019-11-06 18:40:14,496 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:40:14,602 INFO L134 CoverageAnalysis]: Checked inductivity of 196 backedges. 1 proven. 51 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2019-11-06 18:40:14,602 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:40:14,602 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 9] total 23 [2019-11-06 18:40:14,603 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1566652302] [2019-11-06 18:40:14,603 INFO L442 AbstractCegarLoop]: Interpolant automaton has 23 states [2019-11-06 18:40:14,603 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:40:14,604 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2019-11-06 18:40:14,604 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=142, Invalid=364, Unknown=0, NotChecked=0, Total=506 [2019-11-06 18:40:14,604 INFO L87 Difference]: Start difference. First operand 83 states and 99 transitions. Second operand 23 states. [2019-11-06 18:40:14,815 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:40:14,816 INFO L93 Difference]: Finished difference Result 148 states and 186 transitions. [2019-11-06 18:40:14,816 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2019-11-06 18:40:14,816 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 60 [2019-11-06 18:40:14,817 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:40:14,818 INFO L225 Difference]: With dead ends: 148 [2019-11-06 18:40:14,818 INFO L226 Difference]: Without dead ends: 96 [2019-11-06 18:40:14,819 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 76 GetRequests, 55 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 96 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=142, Invalid=364, Unknown=0, NotChecked=0, Total=506 [2019-11-06 18:40:14,819 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 96 states. [2019-11-06 18:40:14,824 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 96 to 91. [2019-11-06 18:40:14,824 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 91 states. [2019-11-06 18:40:14,825 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 91 states to 91 states and 109 transitions. [2019-11-06 18:40:14,825 INFO L78 Accepts]: Start accepts. Automaton has 91 states and 109 transitions. Word has length 60 [2019-11-06 18:40:14,825 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:40:14,825 INFO L462 AbstractCegarLoop]: Abstraction has 91 states and 109 transitions. [2019-11-06 18:40:14,825 INFO L463 AbstractCegarLoop]: Interpolant automaton has 23 states. [2019-11-06 18:40:14,825 INFO L276 IsEmpty]: Start isEmpty. Operand 91 states and 109 transitions. [2019-11-06 18:40:14,826 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2019-11-06 18:40:14,826 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:40:14,826 INFO L410 BasicCegarLoop]: trace histogram [13, 13, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:40:15,031 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:40:15,031 INFO L410 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:40:15,032 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:40:15,032 INFO L82 PathProgramCache]: Analyzing trace with hash 980957794, now seen corresponding path program 13 times [2019-11-06 18:40:15,032 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:40:15,033 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2106958205] [2019-11-06 18:40:15,034 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:40:15,052 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:40:15,201 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:40:15,206 INFO L134 CoverageAnalysis]: Checked inductivity of 240 backedges. 0 proven. 169 refuted. 0 times theorem prover too weak. 71 trivial. 0 not checked. [2019-11-06 18:40:15,206 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2106958205] [2019-11-06 18:40:15,206 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2140450391] [2019-11-06 18:40:15,206 INFO L92 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY 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 [2019-11-06 18:40:15,262 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:40:15,263 INFO L256 TraceCheckSpWp]: Trace formula consists of 201 conjuncts, 15 conjunts are in the unsatisfiable core [2019-11-06 18:40:15,265 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:40:15,288 INFO L134 CoverageAnalysis]: Checked inductivity of 240 backedges. 0 proven. 169 refuted. 0 times theorem prover too weak. 71 trivial. 0 not checked. [2019-11-06 18:40:15,288 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:40:15,289 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 16] total 18 [2019-11-06 18:40:15,289 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [992679597] [2019-11-06 18:40:15,289 INFO L442 AbstractCegarLoop]: Interpolant automaton has 18 states [2019-11-06 18:40:15,289 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:40:15,290 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2019-11-06 18:40:15,290 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=138, Invalid=168, Unknown=0, NotChecked=0, Total=306 [2019-11-06 18:40:15,290 INFO L87 Difference]: Start difference. First operand 91 states and 109 transitions. Second operand 18 states. [2019-11-06 18:40:15,425 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:40:15,426 INFO L93 Difference]: Finished difference Result 152 states and 188 transitions. [2019-11-06 18:40:15,431 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2019-11-06 18:40:15,431 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 65 [2019-11-06 18:40:15,431 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:40:15,432 INFO L225 Difference]: With dead ends: 152 [2019-11-06 18:40:15,432 INFO L226 Difference]: Without dead ends: 94 [2019-11-06 18:40:15,433 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 66 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 37 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=138, Invalid=168, Unknown=0, NotChecked=0, Total=306 [2019-11-06 18:40:15,433 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94 states. [2019-11-06 18:40:15,438 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94 to 93. [2019-11-06 18:40:15,438 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 93 states. [2019-11-06 18:40:15,439 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 93 states to 93 states and 111 transitions. [2019-11-06 18:40:15,439 INFO L78 Accepts]: Start accepts. Automaton has 93 states and 111 transitions. Word has length 65 [2019-11-06 18:40:15,439 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:40:15,439 INFO L462 AbstractCegarLoop]: Abstraction has 93 states and 111 transitions. [2019-11-06 18:40:15,439 INFO L463 AbstractCegarLoop]: Interpolant automaton has 18 states. [2019-11-06 18:40:15,439 INFO L276 IsEmpty]: Start isEmpty. Operand 93 states and 111 transitions. [2019-11-06 18:40:15,440 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2019-11-06 18:40:15,440 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:40:15,440 INFO L410 BasicCegarLoop]: trace histogram [14, 14, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:40:15,643 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:40:15,644 INFO L410 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:40:15,644 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:40:15,644 INFO L82 PathProgramCache]: Analyzing trace with hash 1862843776, now seen corresponding path program 14 times [2019-11-06 18:40:15,645 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:40:15,645 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [752795682] [2019-11-06 18:40:15,645 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:40:15,661 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:40:15,834 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:40:15,839 INFO L134 CoverageAnalysis]: Checked inductivity of 267 backedges. 0 proven. 196 refuted. 0 times theorem prover too weak. 71 trivial. 0 not checked. [2019-11-06 18:40:15,840 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [752795682] [2019-11-06 18:40:15,840 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [449215495] [2019-11-06 18:40:15,840 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 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 [2019-11-06 18:40:15,927 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-11-06 18:40:15,927 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 18:40:15,928 INFO L256 TraceCheckSpWp]: Trace formula consists of 207 conjuncts, 16 conjunts are in the unsatisfiable core [2019-11-06 18:40:15,931 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:40:15,974 INFO L134 CoverageAnalysis]: Checked inductivity of 267 backedges. 0 proven. 196 refuted. 0 times theorem prover too weak. 71 trivial. 0 not checked. [2019-11-06 18:40:15,974 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:40:15,975 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 17] total 19 [2019-11-06 18:40:15,975 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2009087831] [2019-11-06 18:40:15,976 INFO L442 AbstractCegarLoop]: Interpolant automaton has 19 states [2019-11-06 18:40:15,976 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:40:15,976 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2019-11-06 18:40:15,977 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=155, Invalid=187, Unknown=0, NotChecked=0, Total=342 [2019-11-06 18:40:15,978 INFO L87 Difference]: Start difference. First operand 93 states and 111 transitions. Second operand 19 states. [2019-11-06 18:40:16,159 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:40:16,159 INFO L93 Difference]: Finished difference Result 154 states and 190 transitions. [2019-11-06 18:40:16,160 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2019-11-06 18:40:16,160 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 67 [2019-11-06 18:40:16,160 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:40:16,162 INFO L225 Difference]: With dead ends: 154 [2019-11-06 18:40:16,162 INFO L226 Difference]: Without dead ends: 96 [2019-11-06 18:40:16,163 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 85 GetRequests, 68 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=155, Invalid=187, Unknown=0, NotChecked=0, Total=342 [2019-11-06 18:40:16,163 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 96 states. [2019-11-06 18:40:16,169 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 96 to 95. [2019-11-06 18:40:16,169 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 95 states. [2019-11-06 18:40:16,170 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 95 states to 95 states and 113 transitions. [2019-11-06 18:40:16,171 INFO L78 Accepts]: Start accepts. Automaton has 95 states and 113 transitions. Word has length 67 [2019-11-06 18:40:16,171 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:40:16,171 INFO L462 AbstractCegarLoop]: Abstraction has 95 states and 113 transitions. [2019-11-06 18:40:16,171 INFO L463 AbstractCegarLoop]: Interpolant automaton has 19 states. [2019-11-06 18:40:16,172 INFO L276 IsEmpty]: Start isEmpty. Operand 95 states and 113 transitions. [2019-11-06 18:40:16,173 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2019-11-06 18:40:16,173 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:40:16,173 INFO L410 BasicCegarLoop]: trace histogram [15, 15, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:40:16,378 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:40:16,379 INFO L410 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:40:16,379 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:40:16,379 INFO L82 PathProgramCache]: Analyzing trace with hash -1048252130, now seen corresponding path program 15 times [2019-11-06 18:40:16,380 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:40:16,380 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [436506594] [2019-11-06 18:40:16,380 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:40:16,400 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:40:16,612 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:40:16,620 INFO L134 CoverageAnalysis]: Checked inductivity of 296 backedges. 0 proven. 225 refuted. 0 times theorem prover too weak. 71 trivial. 0 not checked. [2019-11-06 18:40:16,620 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [436506594] [2019-11-06 18:40:16,621 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [749335113] [2019-11-06 18:40:16,621 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 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 [2019-11-06 18:40:16,725 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2019-11-06 18:40:16,725 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 18:40:16,727 INFO L256 TraceCheckSpWp]: Trace formula consists of 171 conjuncts, 9 conjunts are in the unsatisfiable core [2019-11-06 18:40:16,728 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:40:16,886 INFO L134 CoverageAnalysis]: Checked inductivity of 296 backedges. 1 proven. 70 refuted. 0 times theorem prover too weak. 225 trivial. 0 not checked. [2019-11-06 18:40:16,886 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:40:16,886 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 10] total 27 [2019-11-06 18:40:16,887 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [403124429] [2019-11-06 18:40:16,888 INFO L442 AbstractCegarLoop]: Interpolant automaton has 27 states [2019-11-06 18:40:16,888 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:40:16,889 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2019-11-06 18:40:16,889 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=199, Invalid=503, Unknown=0, NotChecked=0, Total=702 [2019-11-06 18:40:16,889 INFO L87 Difference]: Start difference. First operand 95 states and 113 transitions. Second operand 27 states. [2019-11-06 18:40:17,100 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:40:17,100 INFO L93 Difference]: Finished difference Result 166 states and 208 transitions. [2019-11-06 18:40:17,100 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2019-11-06 18:40:17,100 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 69 [2019-11-06 18:40:17,101 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:40:17,101 INFO L225 Difference]: With dead ends: 166 [2019-11-06 18:40:17,102 INFO L226 Difference]: Without dead ends: 108 [2019-11-06 18:40:17,104 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 88 GetRequests, 63 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 135 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=199, Invalid=503, Unknown=0, NotChecked=0, Total=702 [2019-11-06 18:40:17,104 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 108 states. [2019-11-06 18:40:17,108 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 108 to 103. [2019-11-06 18:40:17,108 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 103 states. [2019-11-06 18:40:17,109 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 103 states to 103 states and 123 transitions. [2019-11-06 18:40:17,109 INFO L78 Accepts]: Start accepts. Automaton has 103 states and 123 transitions. Word has length 69 [2019-11-06 18:40:17,110 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:40:17,110 INFO L462 AbstractCegarLoop]: Abstraction has 103 states and 123 transitions. [2019-11-06 18:40:17,110 INFO L463 AbstractCegarLoop]: Interpolant automaton has 27 states. [2019-11-06 18:40:17,110 INFO L276 IsEmpty]: Start isEmpty. Operand 103 states and 123 transitions. [2019-11-06 18:40:17,111 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2019-11-06 18:40:17,111 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:40:17,111 INFO L410 BasicCegarLoop]: trace histogram [16, 16, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:40:17,317 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:40:17,317 INFO L410 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:40:17,318 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:40:17,318 INFO L82 PathProgramCache]: Analyzing trace with hash -1331337461, now seen corresponding path program 16 times [2019-11-06 18:40:17,318 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:40:17,319 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1934471540] [2019-11-06 18:40:17,319 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:40:17,336 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:40:17,502 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:40:17,506 INFO L134 CoverageAnalysis]: Checked inductivity of 349 backedges. 0 proven. 256 refuted. 0 times theorem prover too weak. 93 trivial. 0 not checked. [2019-11-06 18:40:17,506 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1934471540] [2019-11-06 18:40:17,506 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [302798682] [2019-11-06 18:40:17,506 INFO L92 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 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 [2019-11-06 18:40:17,577 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-11-06 18:40:17,577 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 18:40:17,578 INFO L256 TraceCheckSpWp]: Trace formula consists of 227 conjuncts, 10 conjunts are in the unsatisfiable core [2019-11-06 18:40:17,579 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:40:17,743 INFO L134 CoverageAnalysis]: Checked inductivity of 349 backedges. 1 proven. 92 refuted. 0 times theorem prover too weak. 256 trivial. 0 not checked. [2019-11-06 18:40:17,743 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:40:17,743 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 11] total 29 [2019-11-06 18:40:17,744 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [86443191] [2019-11-06 18:40:17,744 INFO L442 AbstractCegarLoop]: Interpolant automaton has 29 states [2019-11-06 18:40:17,744 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:40:17,744 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2019-11-06 18:40:17,745 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=227, Invalid=585, Unknown=0, NotChecked=0, Total=812 [2019-11-06 18:40:17,745 INFO L87 Difference]: Start difference. First operand 103 states and 123 transitions. Second operand 29 states. [2019-11-06 18:40:17,892 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:40:17,892 INFO L93 Difference]: Finished difference Result 180 states and 226 transitions. [2019-11-06 18:40:17,892 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2019-11-06 18:40:17,893 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 74 [2019-11-06 18:40:17,893 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:40:17,894 INFO L225 Difference]: With dead ends: 180 [2019-11-06 18:40:17,894 INFO L226 Difference]: Without dead ends: 116 [2019-11-06 18:40:17,895 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 94 GetRequests, 67 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 160 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=227, Invalid=585, Unknown=0, NotChecked=0, Total=812 [2019-11-06 18:40:17,896 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 116 states. [2019-11-06 18:40:17,900 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 116 to 111. [2019-11-06 18:40:17,900 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 111 states. [2019-11-06 18:40:17,901 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 111 states to 111 states and 133 transitions. [2019-11-06 18:40:17,901 INFO L78 Accepts]: Start accepts. Automaton has 111 states and 133 transitions. Word has length 74 [2019-11-06 18:40:17,902 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:40:17,902 INFO L462 AbstractCegarLoop]: Abstraction has 111 states and 133 transitions. [2019-11-06 18:40:17,902 INFO L463 AbstractCegarLoop]: Interpolant automaton has 29 states. [2019-11-06 18:40:17,902 INFO L276 IsEmpty]: Start isEmpty. Operand 111 states and 133 transitions. [2019-11-06 18:40:17,903 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2019-11-06 18:40:17,903 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:40:17,903 INFO L410 BasicCegarLoop]: trace histogram [17, 17, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:40:18,111 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:40:18,112 INFO L410 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:40:18,112 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:40:18,112 INFO L82 PathProgramCache]: Analyzing trace with hash 261485818, now seen corresponding path program 17 times [2019-11-06 18:40:18,112 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:40:18,112 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2121679075] [2019-11-06 18:40:18,113 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:40:18,128 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:40:18,323 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:40:18,329 INFO L134 CoverageAnalysis]: Checked inductivity of 407 backedges. 0 proven. 289 refuted. 0 times theorem prover too weak. 118 trivial. 0 not checked. [2019-11-06 18:40:18,329 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2121679075] [2019-11-06 18:40:18,329 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1924303059] [2019-11-06 18:40:18,329 INFO L92 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 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 [2019-11-06 18:40:18,609 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 17 check-sat command(s) [2019-11-06 18:40:18,610 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 18:40:18,611 INFO L256 TraceCheckSpWp]: Trace formula consists of 182 conjuncts, 11 conjunts are in the unsatisfiable core [2019-11-06 18:40:18,613 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:40:18,830 INFO L134 CoverageAnalysis]: Checked inductivity of 407 backedges. 1 proven. 117 refuted. 0 times theorem prover too weak. 289 trivial. 0 not checked. [2019-11-06 18:40:18,830 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:40:18,830 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 12] total 31 [2019-11-06 18:40:18,831 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [161446559] [2019-11-06 18:40:18,831 INFO L442 AbstractCegarLoop]: Interpolant automaton has 31 states [2019-11-06 18:40:18,831 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:40:18,831 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2019-11-06 18:40:18,832 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=257, Invalid=673, Unknown=0, NotChecked=0, Total=930 [2019-11-06 18:40:18,832 INFO L87 Difference]: Start difference. First operand 111 states and 133 transitions. Second operand 31 states. [2019-11-06 18:40:19,165 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:40:19,165 INFO L93 Difference]: Finished difference Result 194 states and 244 transitions. [2019-11-06 18:40:19,165 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2019-11-06 18:40:19,166 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 79 [2019-11-06 18:40:19,166 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:40:19,167 INFO L225 Difference]: With dead ends: 194 [2019-11-06 18:40:19,167 INFO L226 Difference]: Without dead ends: 124 [2019-11-06 18:40:19,168 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 100 GetRequests, 71 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 187 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=257, Invalid=673, Unknown=0, NotChecked=0, Total=930 [2019-11-06 18:40:19,168 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 124 states. [2019-11-06 18:40:19,172 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 124 to 119. [2019-11-06 18:40:19,172 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 119 states. [2019-11-06 18:40:19,173 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 119 states to 119 states and 143 transitions. [2019-11-06 18:40:19,173 INFO L78 Accepts]: Start accepts. Automaton has 119 states and 143 transitions. Word has length 79 [2019-11-06 18:40:19,173 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:40:19,174 INFO L462 AbstractCegarLoop]: Abstraction has 119 states and 143 transitions. [2019-11-06 18:40:19,174 INFO L463 AbstractCegarLoop]: Interpolant automaton has 31 states. [2019-11-06 18:40:19,174 INFO L276 IsEmpty]: Start isEmpty. Operand 119 states and 143 transitions. [2019-11-06 18:40:19,175 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 85 [2019-11-06 18:40:19,175 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:40:19,175 INFO L410 BasicCegarLoop]: trace histogram [18, 18, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:40:19,380 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:40:19,380 INFO L410 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:40:19,380 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:40:19,381 INFO L82 PathProgramCache]: Analyzing trace with hash -1674935505, now seen corresponding path program 18 times [2019-11-06 18:40:19,381 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:40:19,381 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1793123685] [2019-11-06 18:40:19,381 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:40:19,398 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:40:19,614 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:40:19,620 INFO L134 CoverageAnalysis]: Checked inductivity of 470 backedges. 0 proven. 324 refuted. 0 times theorem prover too weak. 146 trivial. 0 not checked. [2019-11-06 18:40:19,621 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1793123685] [2019-11-06 18:40:19,621 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [274916304] [2019-11-06 18:40:19,621 INFO L92 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE 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 [2019-11-06 18:40:20,026 INFO L249 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 19 check-sat command(s) [2019-11-06 18:40:20,027 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 18:40:20,029 INFO L256 TraceCheckSpWp]: Trace formula consists of 255 conjuncts, 20 conjunts are in the unsatisfiable core [2019-11-06 18:40:20,030 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:40:20,049 INFO L134 CoverageAnalysis]: Checked inductivity of 470 backedges. 0 proven. 324 refuted. 0 times theorem prover too weak. 146 trivial. 0 not checked. [2019-11-06 18:40:20,049 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:40:20,049 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 21] total 23 [2019-11-06 18:40:20,049 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [166194558] [2019-11-06 18:40:20,050 INFO L442 AbstractCegarLoop]: Interpolant automaton has 23 states [2019-11-06 18:40:20,050 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:40:20,050 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2019-11-06 18:40:20,051 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=233, Invalid=273, Unknown=0, NotChecked=0, Total=506 [2019-11-06 18:40:20,051 INFO L87 Difference]: Start difference. First operand 119 states and 143 transitions. Second operand 23 states. [2019-11-06 18:40:20,217 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:40:20,217 INFO L93 Difference]: Finished difference Result 198 states and 246 transitions. [2019-11-06 18:40:20,218 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2019-11-06 18:40:20,219 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 84 [2019-11-06 18:40:20,219 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:40:20,219 INFO L225 Difference]: With dead ends: 198 [2019-11-06 18:40:20,220 INFO L226 Difference]: Without dead ends: 122 [2019-11-06 18:40:20,220 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 106 GetRequests, 85 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 52 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=233, Invalid=273, Unknown=0, NotChecked=0, Total=506 [2019-11-06 18:40:20,221 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 122 states. [2019-11-06 18:40:20,224 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 122 to 121. [2019-11-06 18:40:20,225 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 121 states. [2019-11-06 18:40:20,225 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 121 states to 121 states and 145 transitions. [2019-11-06 18:40:20,226 INFO L78 Accepts]: Start accepts. Automaton has 121 states and 145 transitions. Word has length 84 [2019-11-06 18:40:20,226 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:40:20,226 INFO L462 AbstractCegarLoop]: Abstraction has 121 states and 145 transitions. [2019-11-06 18:40:20,226 INFO L463 AbstractCegarLoop]: Interpolant automaton has 23 states. [2019-11-06 18:40:20,226 INFO L276 IsEmpty]: Start isEmpty. Operand 121 states and 145 transitions. [2019-11-06 18:40:20,227 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2019-11-06 18:40:20,227 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:40:20,227 INFO L410 BasicCegarLoop]: trace histogram [19, 19, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:40:20,431 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:40:20,432 INFO L410 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:40:20,432 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:40:20,433 INFO L82 PathProgramCache]: Analyzing trace with hash 1933852497, now seen corresponding path program 19 times [2019-11-06 18:40:20,433 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:40:20,433 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1723967069] [2019-11-06 18:40:20,434 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:40:20,451 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:40:20,694 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:40:20,699 INFO L134 CoverageAnalysis]: Checked inductivity of 507 backedges. 0 proven. 361 refuted. 0 times theorem prover too weak. 146 trivial. 0 not checked. [2019-11-06 18:40:20,700 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1723967069] [2019-11-06 18:40:20,700 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1646833975] [2019-11-06 18:40:20,700 INFO L92 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:40:20,771 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:40:20,772 INFO L256 TraceCheckSpWp]: Trace formula consists of 261 conjuncts, 21 conjunts are in the unsatisfiable core [2019-11-06 18:40:20,774 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:40:20,825 INFO L134 CoverageAnalysis]: Checked inductivity of 507 backedges. 0 proven. 361 refuted. 0 times theorem prover too weak. 146 trivial. 0 not checked. [2019-11-06 18:40:20,825 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:40:20,825 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 22] total 24 [2019-11-06 18:40:20,826 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1253710535] [2019-11-06 18:40:20,826 INFO L442 AbstractCegarLoop]: Interpolant automaton has 24 states [2019-11-06 18:40:20,826 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:40:20,827 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2019-11-06 18:40:20,827 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=255, Invalid=297, Unknown=0, NotChecked=0, Total=552 [2019-11-06 18:40:20,827 INFO L87 Difference]: Start difference. First operand 121 states and 145 transitions. Second operand 24 states. [2019-11-06 18:40:20,961 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:40:20,962 INFO L93 Difference]: Finished difference Result 200 states and 248 transitions. [2019-11-06 18:40:20,962 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2019-11-06 18:40:20,962 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 86 [2019-11-06 18:40:20,963 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:40:20,964 INFO L225 Difference]: With dead ends: 200 [2019-11-06 18:40:20,964 INFO L226 Difference]: Without dead ends: 124 [2019-11-06 18:40:20,965 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 109 GetRequests, 87 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 55 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=255, Invalid=297, Unknown=0, NotChecked=0, Total=552 [2019-11-06 18:40:20,965 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 124 states. [2019-11-06 18:40:20,969 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 124 to 123. [2019-11-06 18:40:20,969 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 123 states. [2019-11-06 18:40:20,970 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 123 states to 123 states and 147 transitions. [2019-11-06 18:40:20,970 INFO L78 Accepts]: Start accepts. Automaton has 123 states and 147 transitions. Word has length 86 [2019-11-06 18:40:20,970 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:40:20,970 INFO L462 AbstractCegarLoop]: Abstraction has 123 states and 147 transitions. [2019-11-06 18:40:20,970 INFO L463 AbstractCegarLoop]: Interpolant automaton has 24 states. [2019-11-06 18:40:20,971 INFO L276 IsEmpty]: Start isEmpty. Operand 123 states and 147 transitions. [2019-11-06 18:40:20,971 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 89 [2019-11-06 18:40:20,971 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:40:20,971 INFO L410 BasicCegarLoop]: trace histogram [20, 20, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:40:21,177 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:40:21,178 INFO L410 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:40:21,178 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:40:21,178 INFO L82 PathProgramCache]: Analyzing trace with hash -354452749, now seen corresponding path program 20 times [2019-11-06 18:40:21,178 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:40:21,179 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [179746856] [2019-11-06 18:40:21,179 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:40:21,197 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:40:21,445 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:40:21,451 INFO L134 CoverageAnalysis]: Checked inductivity of 546 backedges. 0 proven. 400 refuted. 0 times theorem prover too weak. 146 trivial. 0 not checked. [2019-11-06 18:40:21,451 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [179746856] [2019-11-06 18:40:21,452 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1828111657] [2019-11-06 18:40:21,452 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:40:21,537 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-11-06 18:40:21,538 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 18:40:21,539 INFO L256 TraceCheckSpWp]: Trace formula consists of 267 conjuncts, 22 conjunts are in the unsatisfiable core [2019-11-06 18:40:21,543 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:40:21,579 INFO L134 CoverageAnalysis]: Checked inductivity of 546 backedges. 0 proven. 400 refuted. 0 times theorem prover too weak. 146 trivial. 0 not checked. [2019-11-06 18:40:21,579 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:40:21,580 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 23] total 25 [2019-11-06 18:40:21,580 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [944977526] [2019-11-06 18:40:21,580 INFO L442 AbstractCegarLoop]: Interpolant automaton has 25 states [2019-11-06 18:40:21,581 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:40:21,581 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2019-11-06 18:40:21,581 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=278, Invalid=322, Unknown=0, NotChecked=0, Total=600 [2019-11-06 18:40:21,581 INFO L87 Difference]: Start difference. First operand 123 states and 147 transitions. Second operand 25 states. [2019-11-06 18:40:21,728 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:40:21,728 INFO L93 Difference]: Finished difference Result 202 states and 250 transitions. [2019-11-06 18:40:21,728 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2019-11-06 18:40:21,729 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 88 [2019-11-06 18:40:21,729 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:40:21,730 INFO L225 Difference]: With dead ends: 202 [2019-11-06 18:40:21,730 INFO L226 Difference]: Without dead ends: 126 [2019-11-06 18:40:21,731 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 112 GetRequests, 89 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 58 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=278, Invalid=322, Unknown=0, NotChecked=0, Total=600 [2019-11-06 18:40:21,731 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 126 states. [2019-11-06 18:40:21,735 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 126 to 125. [2019-11-06 18:40:21,735 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 125 states. [2019-11-06 18:40:21,735 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 125 states to 125 states and 149 transitions. [2019-11-06 18:40:21,736 INFO L78 Accepts]: Start accepts. Automaton has 125 states and 149 transitions. Word has length 88 [2019-11-06 18:40:21,736 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:40:21,736 INFO L462 AbstractCegarLoop]: Abstraction has 125 states and 149 transitions. [2019-11-06 18:40:21,736 INFO L463 AbstractCegarLoop]: Interpolant automaton has 25 states. [2019-11-06 18:40:21,736 INFO L276 IsEmpty]: Start isEmpty. Operand 125 states and 149 transitions. [2019-11-06 18:40:21,737 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 91 [2019-11-06 18:40:21,737 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:40:21,737 INFO L410 BasicCegarLoop]: trace histogram [21, 21, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:40:21,939 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:40:21,939 INFO L410 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:40:21,940 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:40:21,940 INFO L82 PathProgramCache]: Analyzing trace with hash -392538603, now seen corresponding path program 21 times [2019-11-06 18:40:21,940 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:40:21,941 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1856308859] [2019-11-06 18:40:21,941 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:40:21,958 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:40:22,262 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:40:22,272 INFO L134 CoverageAnalysis]: Checked inductivity of 587 backedges. 0 proven. 441 refuted. 0 times theorem prover too weak. 146 trivial. 0 not checked. [2019-11-06 18:40:22,272 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1856308859] [2019-11-06 18:40:22,272 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [145074085] [2019-11-06 18:40:22,273 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:40:22,470 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 12 check-sat command(s) [2019-11-06 18:40:22,470 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 18:40:22,472 INFO L256 TraceCheckSpWp]: Trace formula consists of 213 conjuncts, 12 conjunts are in the unsatisfiable core [2019-11-06 18:40:22,474 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:40:22,698 INFO L134 CoverageAnalysis]: Checked inductivity of 587 backedges. 1 proven. 145 refuted. 0 times theorem prover too weak. 441 trivial. 0 not checked. [2019-11-06 18:40:22,698 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:40:22,698 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 13] total 36 [2019-11-06 18:40:22,699 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [734616079] [2019-11-06 18:40:22,699 INFO L442 AbstractCegarLoop]: Interpolant automaton has 36 states [2019-11-06 18:40:22,699 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:40:22,699 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2019-11-06 18:40:22,700 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=355, Invalid=905, Unknown=0, NotChecked=0, Total=1260 [2019-11-06 18:40:22,700 INFO L87 Difference]: Start difference. First operand 125 states and 149 transitions. Second operand 36 states. [2019-11-06 18:40:23,043 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:40:23,043 INFO L93 Difference]: Finished difference Result 214 states and 268 transitions. [2019-11-06 18:40:23,043 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2019-11-06 18:40:23,044 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 90 [2019-11-06 18:40:23,044 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:40:23,045 INFO L225 Difference]: With dead ends: 214 [2019-11-06 18:40:23,045 INFO L226 Difference]: Without dead ends: 138 [2019-11-06 18:40:23,047 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 115 GetRequests, 81 SyntacticMatches, 0 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 252 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=355, Invalid=905, Unknown=0, NotChecked=0, Total=1260 [2019-11-06 18:40:23,047 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 138 states. [2019-11-06 18:40:23,051 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 138 to 133. [2019-11-06 18:40:23,051 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 133 states. [2019-11-06 18:40:23,052 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 133 states to 133 states and 159 transitions. [2019-11-06 18:40:23,052 INFO L78 Accepts]: Start accepts. Automaton has 133 states and 159 transitions. Word has length 90 [2019-11-06 18:40:23,052 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:40:23,052 INFO L462 AbstractCegarLoop]: Abstraction has 133 states and 159 transitions. [2019-11-06 18:40:23,052 INFO L463 AbstractCegarLoop]: Interpolant automaton has 36 states. [2019-11-06 18:40:23,053 INFO L276 IsEmpty]: Start isEmpty. Operand 133 states and 159 transitions. [2019-11-06 18:40:23,053 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 96 [2019-11-06 18:40:23,053 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:40:23,053 INFO L410 BasicCegarLoop]: trace histogram [22, 22, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:40:23,257 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:40:23,257 INFO L410 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:40:23,258 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:40:23,258 INFO L82 PathProgramCache]: Analyzing trace with hash 1768371632, now seen corresponding path program 22 times [2019-11-06 18:40:23,258 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:40:23,258 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [767067997] [2019-11-06 18:40:23,259 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:40:23,277 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:40:23,698 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:40:23,707 INFO L134 CoverageAnalysis]: Checked inductivity of 661 backedges. 0 proven. 484 refuted. 0 times theorem prover too weak. 177 trivial. 0 not checked. [2019-11-06 18:40:23,707 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [767067997] [2019-11-06 18:40:23,708 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [860174030] [2019-11-06 18:40:23,708 INFO L92 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 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:40:23,791 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-11-06 18:40:23,792 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 18:40:23,793 INFO L256 TraceCheckSpWp]: Trace formula consists of 287 conjuncts, 24 conjunts are in the unsatisfiable core [2019-11-06 18:40:23,795 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:40:23,836 INFO L134 CoverageAnalysis]: Checked inductivity of 661 backedges. 0 proven. 484 refuted. 0 times theorem prover too weak. 177 trivial. 0 not checked. [2019-11-06 18:40:23,836 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:40:23,836 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 25] total 27 [2019-11-06 18:40:23,836 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [103815245] [2019-11-06 18:40:23,837 INFO L442 AbstractCegarLoop]: Interpolant automaton has 27 states [2019-11-06 18:40:23,837 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:40:23,837 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2019-11-06 18:40:23,838 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=327, Invalid=375, Unknown=0, NotChecked=0, Total=702 [2019-11-06 18:40:23,838 INFO L87 Difference]: Start difference. First operand 133 states and 159 transitions. Second operand 27 states. [2019-11-06 18:40:24,052 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:40:24,052 INFO L93 Difference]: Finished difference Result 218 states and 270 transitions. [2019-11-06 18:40:24,053 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2019-11-06 18:40:24,053 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 95 [2019-11-06 18:40:24,053 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:40:24,054 INFO L225 Difference]: With dead ends: 218 [2019-11-06 18:40:24,054 INFO L226 Difference]: Without dead ends: 136 [2019-11-06 18:40:24,055 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 121 GetRequests, 96 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 64 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=327, Invalid=375, Unknown=0, NotChecked=0, Total=702 [2019-11-06 18:40:24,056 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 136 states. [2019-11-06 18:40:24,059 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 136 to 135. [2019-11-06 18:40:24,060 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 135 states. [2019-11-06 18:40:24,060 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 135 states to 135 states and 161 transitions. [2019-11-06 18:40:24,061 INFO L78 Accepts]: Start accepts. Automaton has 135 states and 161 transitions. Word has length 95 [2019-11-06 18:40:24,061 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:40:24,061 INFO L462 AbstractCegarLoop]: Abstraction has 135 states and 161 transitions. [2019-11-06 18:40:24,061 INFO L463 AbstractCegarLoop]: Interpolant automaton has 27 states. [2019-11-06 18:40:24,061 INFO L276 IsEmpty]: Start isEmpty. Operand 135 states and 161 transitions. [2019-11-06 18:40:24,062 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 98 [2019-11-06 18:40:24,062 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:40:24,062 INFO L410 BasicCegarLoop]: trace histogram [23, 23, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:40:24,264 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:40:24,265 INFO L410 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:40:24,265 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:40:24,265 INFO L82 PathProgramCache]: Analyzing trace with hash -742920114, now seen corresponding path program 23 times [2019-11-06 18:40:24,265 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:40:24,266 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [351953966] [2019-11-06 18:40:24,266 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:40:24,285 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:40:24,595 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:40:24,602 INFO L134 CoverageAnalysis]: Checked inductivity of 706 backedges. 0 proven. 529 refuted. 0 times theorem prover too weak. 177 trivial. 0 not checked. [2019-11-06 18:40:24,603 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [351953966] [2019-11-06 18:40:24,603 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [112811595] [2019-11-06 18:40:24,603 INFO L92 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:40:25,254 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 23 check-sat command(s) [2019-11-06 18:40:25,254 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 18:40:25,257 INFO L256 TraceCheckSpWp]: Trace formula consists of 234 conjuncts, 13 conjunts are in the unsatisfiable core [2019-11-06 18:40:25,259 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:40:25,486 INFO L134 CoverageAnalysis]: Checked inductivity of 706 backedges. 1 proven. 176 refuted. 0 times theorem prover too weak. 529 trivial. 0 not checked. [2019-11-06 18:40:25,487 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:40:25,487 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 14] total 39 [2019-11-06 18:40:25,487 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2041699719] [2019-11-06 18:40:25,487 INFO L442 AbstractCegarLoop]: Interpolant automaton has 39 states [2019-11-06 18:40:25,487 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:40:25,488 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2019-11-06 18:40:25,488 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=417, Invalid=1065, Unknown=0, NotChecked=0, Total=1482 [2019-11-06 18:40:25,488 INFO L87 Difference]: Start difference. First operand 135 states and 161 transitions. Second operand 39 states. [2019-11-06 18:40:25,840 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:40:25,840 INFO L93 Difference]: Finished difference Result 230 states and 288 transitions. [2019-11-06 18:40:25,840 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2019-11-06 18:40:25,841 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 97 [2019-11-06 18:40:25,841 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:40:25,842 INFO L225 Difference]: With dead ends: 230 [2019-11-06 18:40:25,842 INFO L226 Difference]: Without dead ends: 148 [2019-11-06 18:40:25,844 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 124 GetRequests, 87 SyntacticMatches, 0 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 299 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=417, Invalid=1065, Unknown=0, NotChecked=0, Total=1482 [2019-11-06 18:40:25,844 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 148 states. [2019-11-06 18:40:25,848 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 148 to 143. [2019-11-06 18:40:25,848 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 143 states. [2019-11-06 18:40:25,849 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 143 states to 143 states and 171 transitions. [2019-11-06 18:40:25,849 INFO L78 Accepts]: Start accepts. Automaton has 143 states and 171 transitions. Word has length 97 [2019-11-06 18:40:25,849 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:40:25,849 INFO L462 AbstractCegarLoop]: Abstraction has 143 states and 171 transitions. [2019-11-06 18:40:25,849 INFO L463 AbstractCegarLoop]: Interpolant automaton has 39 states. [2019-11-06 18:40:25,850 INFO L276 IsEmpty]: Start isEmpty. Operand 143 states and 171 transitions. [2019-11-06 18:40:25,850 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 103 [2019-11-06 18:40:25,850 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:40:25,851 INFO L410 BasicCegarLoop]: trace histogram [24, 24, 12, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:40:26,056 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:40:26,057 INFO L410 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:40:26,057 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:40:26,057 INFO L82 PathProgramCache]: Analyzing trace with hash -1743015205, now seen corresponding path program 24 times [2019-11-06 18:40:26,058 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:40:26,058 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1555848711] [2019-11-06 18:40:26,058 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:40:26,086 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:40:26,441 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:40:26,450 INFO L134 CoverageAnalysis]: Checked inductivity of 787 backedges. 0 proven. 576 refuted. 0 times theorem prover too weak. 211 trivial. 0 not checked. [2019-11-06 18:40:26,451 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1555848711] [2019-11-06 18:40:26,451 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [830757752] [2019-11-06 18:40:26,451 INFO L92 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:40:27,681 INFO L249 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 25 check-sat command(s) [2019-11-06 18:40:27,681 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 18:40:27,684 INFO L256 TraceCheckSpWp]: Trace formula consists of 307 conjuncts, 26 conjunts are in the unsatisfiable core [2019-11-06 18:40:27,690 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:40:27,706 INFO L134 CoverageAnalysis]: Checked inductivity of 787 backedges. 0 proven. 576 refuted. 0 times theorem prover too weak. 211 trivial. 0 not checked. [2019-11-06 18:40:27,706 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:40:27,707 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 27] total 29 [2019-11-06 18:40:27,707 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [420939153] [2019-11-06 18:40:27,707 INFO L442 AbstractCegarLoop]: Interpolant automaton has 29 states [2019-11-06 18:40:27,707 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:40:27,708 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2019-11-06 18:40:27,708 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=380, Invalid=432, Unknown=0, NotChecked=0, Total=812 [2019-11-06 18:40:27,708 INFO L87 Difference]: Start difference. First operand 143 states and 171 transitions. Second operand 29 states. [2019-11-06 18:40:27,901 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:40:27,902 INFO L93 Difference]: Finished difference Result 234 states and 290 transitions. [2019-11-06 18:40:27,902 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2019-11-06 18:40:27,902 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 102 [2019-11-06 18:40:27,902 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:40:27,904 INFO L225 Difference]: With dead ends: 234 [2019-11-06 18:40:27,904 INFO L226 Difference]: Without dead ends: 146 [2019-11-06 18:40:27,905 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 130 GetRequests, 103 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 70 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=380, Invalid=432, Unknown=0, NotChecked=0, Total=812 [2019-11-06 18:40:27,905 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 146 states. [2019-11-06 18:40:27,908 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 146 to 145. [2019-11-06 18:40:27,908 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 145 states. [2019-11-06 18:40:27,909 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 145 states to 145 states and 173 transitions. [2019-11-06 18:40:27,909 INFO L78 Accepts]: Start accepts. Automaton has 145 states and 173 transitions. Word has length 102 [2019-11-06 18:40:27,910 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:40:27,910 INFO L462 AbstractCegarLoop]: Abstraction has 145 states and 173 transitions. [2019-11-06 18:40:27,910 INFO L463 AbstractCegarLoop]: Interpolant automaton has 29 states. [2019-11-06 18:40:27,910 INFO L276 IsEmpty]: Start isEmpty. Operand 145 states and 173 transitions. [2019-11-06 18:40:27,911 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 105 [2019-11-06 18:40:27,911 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:40:27,911 INFO L410 BasicCegarLoop]: trace histogram [25, 25, 12, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:40:28,116 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:40:28,116 INFO L410 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:40:28,117 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:40:28,117 INFO L82 PathProgramCache]: Analyzing trace with hash -1419810179, now seen corresponding path program 25 times [2019-11-06 18:40:28,117 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:40:28,117 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1927050607] [2019-11-06 18:40:28,118 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:40:28,138 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:40:28,642 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:40:28,658 INFO L134 CoverageAnalysis]: Checked inductivity of 836 backedges. 0 proven. 625 refuted. 0 times theorem prover too weak. 211 trivial. 0 not checked. [2019-11-06 18:40:28,658 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1927050607] [2019-11-06 18:40:28,659 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1640589466] [2019-11-06 18:40:28,659 INFO L92 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:40:28,770 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:40:28,772 INFO L256 TraceCheckSpWp]: Trace formula consists of 313 conjuncts, 27 conjunts are in the unsatisfiable core [2019-11-06 18:40:28,774 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:40:28,821 INFO L134 CoverageAnalysis]: Checked inductivity of 836 backedges. 0 proven. 625 refuted. 0 times theorem prover too weak. 211 trivial. 0 not checked. [2019-11-06 18:40:28,822 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:40:28,822 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 28] total 30 [2019-11-06 18:40:28,822 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1122597947] [2019-11-06 18:40:28,823 INFO L442 AbstractCegarLoop]: Interpolant automaton has 30 states [2019-11-06 18:40:28,823 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:40:28,823 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2019-11-06 18:40:28,824 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=408, Invalid=462, Unknown=0, NotChecked=0, Total=870 [2019-11-06 18:40:28,824 INFO L87 Difference]: Start difference. First operand 145 states and 173 transitions. Second operand 30 states. [2019-11-06 18:40:29,013 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:40:29,013 INFO L93 Difference]: Finished difference Result 236 states and 292 transitions. [2019-11-06 18:40:29,014 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2019-11-06 18:40:29,014 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 104 [2019-11-06 18:40:29,015 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:40:29,016 INFO L225 Difference]: With dead ends: 236 [2019-11-06 18:40:29,016 INFO L226 Difference]: Without dead ends: 148 [2019-11-06 18:40:29,017 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 133 GetRequests, 105 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 73 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=408, Invalid=462, Unknown=0, NotChecked=0, Total=870 [2019-11-06 18:40:29,017 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 148 states. [2019-11-06 18:40:29,021 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 148 to 147. [2019-11-06 18:40:29,022 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 147 states. [2019-11-06 18:40:29,022 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 147 states to 147 states and 175 transitions. [2019-11-06 18:40:29,023 INFO L78 Accepts]: Start accepts. Automaton has 147 states and 175 transitions. Word has length 104 [2019-11-06 18:40:29,023 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:40:29,023 INFO L462 AbstractCegarLoop]: Abstraction has 147 states and 175 transitions. [2019-11-06 18:40:29,023 INFO L463 AbstractCegarLoop]: Interpolant automaton has 30 states. [2019-11-06 18:40:29,023 INFO L276 IsEmpty]: Start isEmpty. Operand 147 states and 175 transitions. [2019-11-06 18:40:29,024 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 107 [2019-11-06 18:40:29,024 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:40:29,024 INFO L410 BasicCegarLoop]: trace histogram [26, 26, 12, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:40:29,228 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:40:29,229 INFO L410 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:40:29,229 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:40:29,229 INFO L82 PathProgramCache]: Analyzing trace with hash -57425505, now seen corresponding path program 26 times [2019-11-06 18:40:29,229 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:40:29,230 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1719003247] [2019-11-06 18:40:29,230 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:40:29,250 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:40:29,672 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:40:29,682 INFO L134 CoverageAnalysis]: Checked inductivity of 887 backedges. 0 proven. 676 refuted. 0 times theorem prover too weak. 211 trivial. 0 not checked. [2019-11-06 18:40:29,682 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1719003247] [2019-11-06 18:40:29,682 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [824158160] [2019-11-06 18:40:29,683 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 27 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 27 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:40:29,778 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-11-06 18:40:29,778 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 18:40:29,780 INFO L256 TraceCheckSpWp]: Trace formula consists of 319 conjuncts, 28 conjunts are in the unsatisfiable core [2019-11-06 18:40:29,782 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:40:29,820 INFO L134 CoverageAnalysis]: Checked inductivity of 887 backedges. 0 proven. 676 refuted. 0 times theorem prover too weak. 211 trivial. 0 not checked. [2019-11-06 18:40:29,820 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:40:29,821 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 29] total 31 [2019-11-06 18:40:29,822 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [623724914] [2019-11-06 18:40:29,822 INFO L442 AbstractCegarLoop]: Interpolant automaton has 31 states [2019-11-06 18:40:29,822 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:40:29,822 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2019-11-06 18:40:29,823 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=437, Invalid=493, Unknown=0, NotChecked=0, Total=930 [2019-11-06 18:40:29,823 INFO L87 Difference]: Start difference. First operand 147 states and 175 transitions. Second operand 31 states. [2019-11-06 18:40:30,028 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:40:30,029 INFO L93 Difference]: Finished difference Result 238 states and 294 transitions. [2019-11-06 18:40:30,029 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2019-11-06 18:40:30,029 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 106 [2019-11-06 18:40:30,029 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:40:30,030 INFO L225 Difference]: With dead ends: 238 [2019-11-06 18:40:30,030 INFO L226 Difference]: Without dead ends: 150 [2019-11-06 18:40:30,031 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 136 GetRequests, 107 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 76 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=437, Invalid=493, Unknown=0, NotChecked=0, Total=930 [2019-11-06 18:40:30,032 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 150 states. [2019-11-06 18:40:30,036 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 150 to 149. [2019-11-06 18:40:30,036 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 149 states. [2019-11-06 18:40:30,037 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 149 states to 149 states and 177 transitions. [2019-11-06 18:40:30,037 INFO L78 Accepts]: Start accepts. Automaton has 149 states and 177 transitions. Word has length 106 [2019-11-06 18:40:30,038 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:40:30,038 INFO L462 AbstractCegarLoop]: Abstraction has 149 states and 177 transitions. [2019-11-06 18:40:30,038 INFO L463 AbstractCegarLoop]: Interpolant automaton has 31 states. [2019-11-06 18:40:30,038 INFO L276 IsEmpty]: Start isEmpty. Operand 149 states and 177 transitions. [2019-11-06 18:40:30,039 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 109 [2019-11-06 18:40:30,039 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:40:30,039 INFO L410 BasicCegarLoop]: trace histogram [27, 27, 12, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:40:30,242 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:40:30,243 INFO L410 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:40:30,243 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:40:30,243 INFO L82 PathProgramCache]: Analyzing trace with hash -770779071, now seen corresponding path program 27 times [2019-11-06 18:40:30,244 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:40:30,244 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [405759633] [2019-11-06 18:40:30,244 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:40:30,266 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:40:30,658 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:40:30,667 INFO L134 CoverageAnalysis]: Checked inductivity of 940 backedges. 0 proven. 729 refuted. 0 times theorem prover too weak. 211 trivial. 0 not checked. [2019-11-06 18:40:30,667 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [405759633] [2019-11-06 18:40:30,667 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1288365899] [2019-11-06 18:40:30,667 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:40:30,863 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 14 check-sat command(s) [2019-11-06 18:40:30,863 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 18:40:30,864 INFO L256 TraceCheckSpWp]: Trace formula consists of 241 conjuncts, 14 conjunts are in the unsatisfiable core [2019-11-06 18:40:30,865 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:40:31,109 INFO L134 CoverageAnalysis]: Checked inductivity of 940 backedges. 1 proven. 210 refuted. 0 times theorem prover too weak. 729 trivial. 0 not checked. [2019-11-06 18:40:31,110 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:40:31,110 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 15] total 44 [2019-11-06 18:40:31,110 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [203611788] [2019-11-06 18:40:31,110 INFO L442 AbstractCegarLoop]: Interpolant automaton has 44 states [2019-11-06 18:40:31,111 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:40:31,111 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2019-11-06 18:40:31,111 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=541, Invalid=1351, Unknown=0, NotChecked=0, Total=1892 [2019-11-06 18:40:31,111 INFO L87 Difference]: Start difference. First operand 149 states and 177 transitions. Second operand 44 states. [2019-11-06 18:40:31,487 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:40:31,487 INFO L93 Difference]: Finished difference Result 250 states and 312 transitions. [2019-11-06 18:40:31,488 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2019-11-06 18:40:31,488 INFO L78 Accepts]: Start accepts. Automaton has 44 states. Word has length 108 [2019-11-06 18:40:31,488 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:40:31,489 INFO L225 Difference]: With dead ends: 250 [2019-11-06 18:40:31,489 INFO L226 Difference]: Without dead ends: 162 [2019-11-06 18:40:31,491 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 139 GetRequests, 97 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 378 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=541, Invalid=1351, Unknown=0, NotChecked=0, Total=1892 [2019-11-06 18:40:31,491 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 162 states. [2019-11-06 18:40:31,495 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 162 to 157. [2019-11-06 18:40:31,495 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 157 states. [2019-11-06 18:40:31,496 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 157 states to 157 states and 187 transitions. [2019-11-06 18:40:31,496 INFO L78 Accepts]: Start accepts. Automaton has 157 states and 187 transitions. Word has length 108 [2019-11-06 18:40:31,497 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:40:31,497 INFO L462 AbstractCegarLoop]: Abstraction has 157 states and 187 transitions. [2019-11-06 18:40:31,497 INFO L463 AbstractCegarLoop]: Interpolant automaton has 44 states. [2019-11-06 18:40:31,497 INFO L276 IsEmpty]: Start isEmpty. Operand 157 states and 187 transitions. [2019-11-06 18:40:31,498 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 114 [2019-11-06 18:40:31,498 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:40:31,498 INFO L410 BasicCegarLoop]: trace histogram [28, 28, 13, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:40:31,702 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:40:31,703 INFO L410 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:40:31,703 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:40:31,703 INFO L82 PathProgramCache]: Analyzing trace with hash 1597532292, now seen corresponding path program 28 times [2019-11-06 18:40:31,704 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:40:31,704 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1746413686] [2019-11-06 18:40:31,704 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:40:31,726 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:40:32,122 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:40:32,131 INFO L134 CoverageAnalysis]: Checked inductivity of 1032 backedges. 0 proven. 784 refuted. 0 times theorem prover too weak. 248 trivial. 0 not checked. [2019-11-06 18:40:32,131 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1746413686] [2019-11-06 18:40:32,131 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [492034326] [2019-11-06 18:40:32,131 INFO L92 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 29 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 29 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:40:32,227 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-11-06 18:40:32,227 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 18:40:32,228 INFO L256 TraceCheckSpWp]: Trace formula consists of 339 conjuncts, 30 conjunts are in the unsatisfiable core [2019-11-06 18:40:32,230 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:40:32,252 INFO L134 CoverageAnalysis]: Checked inductivity of 1032 backedges. 0 proven. 784 refuted. 0 times theorem prover too weak. 248 trivial. 0 not checked. [2019-11-06 18:40:32,253 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:40:32,253 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 31] total 33 [2019-11-06 18:40:32,253 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [902400474] [2019-11-06 18:40:32,254 INFO L442 AbstractCegarLoop]: Interpolant automaton has 33 states [2019-11-06 18:40:32,254 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:40:32,254 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2019-11-06 18:40:32,255 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=498, Invalid=558, Unknown=0, NotChecked=0, Total=1056 [2019-11-06 18:40:32,255 INFO L87 Difference]: Start difference. First operand 157 states and 187 transitions. Second operand 33 states. [2019-11-06 18:40:32,464 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:40:32,464 INFO L93 Difference]: Finished difference Result 254 states and 314 transitions. [2019-11-06 18:40:32,465 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2019-11-06 18:40:32,465 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 113 [2019-11-06 18:40:32,465 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:40:32,466 INFO L225 Difference]: With dead ends: 254 [2019-11-06 18:40:32,467 INFO L226 Difference]: Without dead ends: 160 [2019-11-06 18:40:32,468 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 145 GetRequests, 114 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 82 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=498, Invalid=558, Unknown=0, NotChecked=0, Total=1056 [2019-11-06 18:40:32,469 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 160 states. [2019-11-06 18:40:32,473 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 160 to 159. [2019-11-06 18:40:32,474 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 159 states. [2019-11-06 18:40:32,475 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 159 states to 159 states and 189 transitions. [2019-11-06 18:40:32,476 INFO L78 Accepts]: Start accepts. Automaton has 159 states and 189 transitions. Word has length 113 [2019-11-06 18:40:32,476 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:40:32,476 INFO L462 AbstractCegarLoop]: Abstraction has 159 states and 189 transitions. [2019-11-06 18:40:32,476 INFO L463 AbstractCegarLoop]: Interpolant automaton has 33 states. [2019-11-06 18:40:32,476 INFO L276 IsEmpty]: Start isEmpty. Operand 159 states and 189 transitions. [2019-11-06 18:40:32,477 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 116 [2019-11-06 18:40:32,477 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:40:32,478 INFO L410 BasicCegarLoop]: trace histogram [29, 29, 13, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:40:32,682 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 29 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:40:32,682 INFO L410 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:40:32,683 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:40:32,683 INFO L82 PathProgramCache]: Analyzing trace with hash -1883834462, now seen corresponding path program 29 times [2019-11-06 18:40:32,683 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:40:32,683 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [146343211] [2019-11-06 18:40:32,684 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:40:32,704 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:40:33,172 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:40:33,182 INFO L134 CoverageAnalysis]: Checked inductivity of 1089 backedges. 0 proven. 841 refuted. 0 times theorem prover too weak. 248 trivial. 0 not checked. [2019-11-06 18:40:33,182 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [146343211] [2019-11-06 18:40:33,182 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [366061237] [2019-11-06 18:40:33,183 INFO L92 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:40:34,141 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 29 check-sat command(s) [2019-11-06 18:40:34,141 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 18:40:34,146 INFO L256 TraceCheckSpWp]: Trace formula consists of 286 conjuncts, 15 conjunts are in the unsatisfiable core [2019-11-06 18:40:34,147 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:40:34,419 INFO L134 CoverageAnalysis]: Checked inductivity of 1089 backedges. 1 proven. 247 refuted. 0 times theorem prover too weak. 841 trivial. 0 not checked. [2019-11-06 18:40:34,419 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:40:34,419 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 16] total 47 [2019-11-06 18:40:34,419 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [354320197] [2019-11-06 18:40:34,420 INFO L442 AbstractCegarLoop]: Interpolant automaton has 47 states [2019-11-06 18:40:34,420 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:40:34,420 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2019-11-06 18:40:34,421 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=617, Invalid=1545, Unknown=0, NotChecked=0, Total=2162 [2019-11-06 18:40:34,421 INFO L87 Difference]: Start difference. First operand 159 states and 189 transitions. Second operand 47 states. [2019-11-06 18:40:34,773 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:40:34,773 INFO L93 Difference]: Finished difference Result 266 states and 332 transitions. [2019-11-06 18:40:34,773 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2019-11-06 18:40:34,773 INFO L78 Accepts]: Start accepts. Automaton has 47 states. Word has length 115 [2019-11-06 18:40:34,774 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:40:34,774 INFO L225 Difference]: With dead ends: 266 [2019-11-06 18:40:34,775 INFO L226 Difference]: Without dead ends: 172 [2019-11-06 18:40:34,776 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 148 GetRequests, 103 SyntacticMatches, 0 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 435 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=617, Invalid=1545, Unknown=0, NotChecked=0, Total=2162 [2019-11-06 18:40:34,776 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 172 states. [2019-11-06 18:40:34,780 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 172 to 167. [2019-11-06 18:40:34,780 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 167 states. [2019-11-06 18:40:34,781 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 167 states to 167 states and 199 transitions. [2019-11-06 18:40:34,782 INFO L78 Accepts]: Start accepts. Automaton has 167 states and 199 transitions. Word has length 115 [2019-11-06 18:40:34,782 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:40:34,782 INFO L462 AbstractCegarLoop]: Abstraction has 167 states and 199 transitions. [2019-11-06 18:40:34,782 INFO L463 AbstractCegarLoop]: Interpolant automaton has 47 states. [2019-11-06 18:40:34,782 INFO L276 IsEmpty]: Start isEmpty. Operand 167 states and 199 transitions. [2019-11-06 18:40:34,784 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 121 [2019-11-06 18:40:34,784 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:40:34,784 INFO L410 BasicCegarLoop]: trace histogram [30, 30, 14, 14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:40:34,993 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 30 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:40:34,994 INFO L410 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:40:34,994 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:40:34,994 INFO L82 PathProgramCache]: Analyzing trace with hash -1764460921, now seen corresponding path program 30 times [2019-11-06 18:40:34,995 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:40:34,995 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [888229267] [2019-11-06 18:40:34,995 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:40:35,028 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:40:35,773 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:40:35,796 INFO L134 CoverageAnalysis]: Checked inductivity of 1188 backedges. 0 proven. 900 refuted. 0 times theorem prover too weak. 288 trivial. 0 not checked. [2019-11-06 18:40:35,796 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [888229267] [2019-11-06 18:40:35,796 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1597746324] [2019-11-06 18:40:35,797 INFO L92 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 31 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 31 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:40:39,960 INFO L249 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 31 check-sat command(s) [2019-11-06 18:40:39,960 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 18:40:39,965 INFO L256 TraceCheckSpWp]: Trace formula consists of 359 conjuncts, 35 conjunts are in the unsatisfiable core [2019-11-06 18:40:39,968 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:40:40,024 INFO L134 CoverageAnalysis]: Checked inductivity of 1188 backedges. 0 proven. 900 refuted. 0 times theorem prover too weak. 288 trivial. 0 not checked. [2019-11-06 18:40:40,024 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:40:40,024 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 33] total 35 [2019-11-06 18:40:40,024 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2070724761] [2019-11-06 18:40:40,027 INFO L442 AbstractCegarLoop]: Interpolant automaton has 35 states [2019-11-06 18:40:40,027 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:40:40,027 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2019-11-06 18:40:40,028 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=563, Invalid=627, Unknown=0, NotChecked=0, Total=1190 [2019-11-06 18:40:40,028 INFO L87 Difference]: Start difference. First operand 167 states and 199 transitions. Second operand 35 states. [2019-11-06 18:40:40,305 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:40:40,306 INFO L93 Difference]: Finished difference Result 270 states and 334 transitions. [2019-11-06 18:40:40,306 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2019-11-06 18:40:40,306 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 120 [2019-11-06 18:40:40,306 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:40:40,307 INFO L225 Difference]: With dead ends: 270 [2019-11-06 18:40:40,307 INFO L226 Difference]: Without dead ends: 170 [2019-11-06 18:40:40,308 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 154 GetRequests, 121 SyntacticMatches, 0 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 88 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=563, Invalid=627, Unknown=0, NotChecked=0, Total=1190 [2019-11-06 18:40:40,309 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 170 states. [2019-11-06 18:40:40,314 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 170 to 169. [2019-11-06 18:40:40,314 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 169 states. [2019-11-06 18:40:40,315 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 169 states to 169 states and 201 transitions. [2019-11-06 18:40:40,316 INFO L78 Accepts]: Start accepts. Automaton has 169 states and 201 transitions. Word has length 120 [2019-11-06 18:40:40,316 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:40:40,317 INFO L462 AbstractCegarLoop]: Abstraction has 169 states and 201 transitions. [2019-11-06 18:40:40,317 INFO L463 AbstractCegarLoop]: Interpolant automaton has 35 states. [2019-11-06 18:40:40,317 INFO L276 IsEmpty]: Start isEmpty. Operand 169 states and 201 transitions. [2019-11-06 18:40:40,319 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 123 [2019-11-06 18:40:40,319 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:40:40,319 INFO L410 BasicCegarLoop]: trace histogram [31, 31, 14, 14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:40:40,527 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 31 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:40:40,528 INFO L410 AbstractCegarLoop]: === Iteration 35 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:40:40,528 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:40:40,528 INFO L82 PathProgramCache]: Analyzing trace with hash 1896499625, now seen corresponding path program 31 times [2019-11-06 18:40:40,529 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:40:40,529 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [686971284] [2019-11-06 18:40:40,529 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:40:40,560 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:40:41,213 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:40:41,225 INFO L134 CoverageAnalysis]: Checked inductivity of 1249 backedges. 0 proven. 961 refuted. 0 times theorem prover too weak. 288 trivial. 0 not checked. [2019-11-06 18:40:41,225 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [686971284] [2019-11-06 18:40:41,226 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [607102992] [2019-11-06 18:40:41,226 INFO L92 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 32 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 32 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:40:41,336 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:40:41,337 INFO L256 TraceCheckSpWp]: Trace formula consists of 365 conjuncts, 33 conjunts are in the unsatisfiable core [2019-11-06 18:40:41,338 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:40:41,361 INFO L134 CoverageAnalysis]: Checked inductivity of 1249 backedges. 0 proven. 961 refuted. 0 times theorem prover too weak. 288 trivial. 0 not checked. [2019-11-06 18:40:41,361 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:40:41,361 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 34] total 36 [2019-11-06 18:40:41,362 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1977299741] [2019-11-06 18:40:41,362 INFO L442 AbstractCegarLoop]: Interpolant automaton has 36 states [2019-11-06 18:40:41,362 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:40:41,363 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2019-11-06 18:40:41,363 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=597, Invalid=663, Unknown=0, NotChecked=0, Total=1260 [2019-11-06 18:40:41,363 INFO L87 Difference]: Start difference. First operand 169 states and 201 transitions. Second operand 36 states. [2019-11-06 18:40:41,629 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:40:41,629 INFO L93 Difference]: Finished difference Result 272 states and 336 transitions. [2019-11-06 18:40:41,629 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2019-11-06 18:40:41,629 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 122 [2019-11-06 18:40:41,630 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:40:41,631 INFO L225 Difference]: With dead ends: 272 [2019-11-06 18:40:41,631 INFO L226 Difference]: Without dead ends: 172 [2019-11-06 18:40:41,632 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 157 GetRequests, 123 SyntacticMatches, 0 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 91 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=597, Invalid=663, Unknown=0, NotChecked=0, Total=1260 [2019-11-06 18:40:41,633 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 172 states. [2019-11-06 18:40:41,638 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 172 to 171. [2019-11-06 18:40:41,639 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 171 states. [2019-11-06 18:40:41,639 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 171 states to 171 states and 203 transitions. [2019-11-06 18:40:41,640 INFO L78 Accepts]: Start accepts. Automaton has 171 states and 203 transitions. Word has length 122 [2019-11-06 18:40:41,640 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:40:41,640 INFO L462 AbstractCegarLoop]: Abstraction has 171 states and 203 transitions. [2019-11-06 18:40:41,640 INFO L463 AbstractCegarLoop]: Interpolant automaton has 36 states. [2019-11-06 18:40:41,640 INFO L276 IsEmpty]: Start isEmpty. Operand 171 states and 203 transitions. [2019-11-06 18:40:41,641 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 125 [2019-11-06 18:40:41,641 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:40:41,641 INFO L410 BasicCegarLoop]: trace histogram [32, 32, 14, 14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:40:41,842 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 32 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:40:41,842 INFO L410 AbstractCegarLoop]: === Iteration 36 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:40:41,842 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:40:41,842 INFO L82 PathProgramCache]: Analyzing trace with hash -1793598389, now seen corresponding path program 32 times [2019-11-06 18:40:41,842 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:40:41,843 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1895802963] [2019-11-06 18:40:41,843 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:40:41,865 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:40:42,311 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:40:42,322 INFO L134 CoverageAnalysis]: Checked inductivity of 1312 backedges. 0 proven. 1024 refuted. 0 times theorem prover too weak. 288 trivial. 0 not checked. [2019-11-06 18:40:42,322 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1895802963] [2019-11-06 18:40:42,322 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1968142420] [2019-11-06 18:40:42,322 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 33 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 33 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:40:42,434 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-11-06 18:40:42,434 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 18:40:42,435 INFO L256 TraceCheckSpWp]: Trace formula consists of 371 conjuncts, 34 conjunts are in the unsatisfiable core [2019-11-06 18:40:42,440 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:40:42,464 INFO L134 CoverageAnalysis]: Checked inductivity of 1312 backedges. 0 proven. 1024 refuted. 0 times theorem prover too weak. 288 trivial. 0 not checked. [2019-11-06 18:40:42,465 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:40:42,465 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36, 35] total 37 [2019-11-06 18:40:42,465 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [212106298] [2019-11-06 18:40:42,465 INFO L442 AbstractCegarLoop]: Interpolant automaton has 37 states [2019-11-06 18:40:42,465 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:40:42,466 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2019-11-06 18:40:42,466 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=632, Invalid=700, Unknown=0, NotChecked=0, Total=1332 [2019-11-06 18:40:42,466 INFO L87 Difference]: Start difference. First operand 171 states and 203 transitions. Second operand 37 states. [2019-11-06 18:40:42,742 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:40:42,742 INFO L93 Difference]: Finished difference Result 274 states and 338 transitions. [2019-11-06 18:40:42,743 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2019-11-06 18:40:42,743 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 124 [2019-11-06 18:40:42,743 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:40:42,744 INFO L225 Difference]: With dead ends: 274 [2019-11-06 18:40:42,745 INFO L226 Difference]: Without dead ends: 174 [2019-11-06 18:40:42,746 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 160 GetRequests, 125 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 94 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=632, Invalid=700, Unknown=0, NotChecked=0, Total=1332 [2019-11-06 18:40:42,746 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 174 states. [2019-11-06 18:40:42,750 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 174 to 173. [2019-11-06 18:40:42,750 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 173 states. [2019-11-06 18:40:42,751 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 173 states to 173 states and 205 transitions. [2019-11-06 18:40:42,751 INFO L78 Accepts]: Start accepts. Automaton has 173 states and 205 transitions. Word has length 124 [2019-11-06 18:40:42,751 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:40:42,751 INFO L462 AbstractCegarLoop]: Abstraction has 173 states and 205 transitions. [2019-11-06 18:40:42,751 INFO L463 AbstractCegarLoop]: Interpolant automaton has 37 states. [2019-11-06 18:40:42,752 INFO L276 IsEmpty]: Start isEmpty. Operand 173 states and 205 transitions. [2019-11-06 18:40:42,752 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 127 [2019-11-06 18:40:42,752 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:40:42,753 INFO L410 BasicCegarLoop]: trace histogram [33, 33, 14, 14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:40:42,956 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 33 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:40:42,956 INFO L410 AbstractCegarLoop]: === Iteration 37 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:40:42,957 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:40:42,957 INFO L82 PathProgramCache]: Analyzing trace with hash -334803347, now seen corresponding path program 33 times [2019-11-06 18:40:42,957 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:40:42,958 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [632893734] [2019-11-06 18:40:42,958 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:40:42,980 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:40:43,716 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:40:43,732 INFO L134 CoverageAnalysis]: Checked inductivity of 1377 backedges. 0 proven. 1089 refuted. 0 times theorem prover too weak. 288 trivial. 0 not checked. [2019-11-06 18:40:43,733 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [632893734] [2019-11-06 18:40:43,733 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1995513460] [2019-11-06 18:40:43,733 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 34 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 34 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:40:44,084 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 16 check-sat command(s) [2019-11-06 18:40:44,084 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 18:40:44,086 INFO L256 TraceCheckSpWp]: Trace formula consists of 269 conjuncts, 16 conjunts are in the unsatisfiable core [2019-11-06 18:40:44,087 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:40:44,443 INFO L134 CoverageAnalysis]: Checked inductivity of 1377 backedges. 1 proven. 287 refuted. 0 times theorem prover too weak. 1089 trivial. 0 not checked. [2019-11-06 18:40:44,443 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:40:44,443 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37, 17] total 52 [2019-11-06 18:40:44,444 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1170346046] [2019-11-06 18:40:44,444 INFO L442 AbstractCegarLoop]: Interpolant automaton has 52 states [2019-11-06 18:40:44,444 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:40:44,444 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2019-11-06 18:40:44,445 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=767, Invalid=1885, Unknown=0, NotChecked=0, Total=2652 [2019-11-06 18:40:44,445 INFO L87 Difference]: Start difference. First operand 173 states and 205 transitions. Second operand 52 states. [2019-11-06 18:40:44,934 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:40:44,934 INFO L93 Difference]: Finished difference Result 286 states and 356 transitions. [2019-11-06 18:40:44,934 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 52 states. [2019-11-06 18:40:44,934 INFO L78 Accepts]: Start accepts. Automaton has 52 states. Word has length 126 [2019-11-06 18:40:44,935 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:40:44,936 INFO L225 Difference]: With dead ends: 286 [2019-11-06 18:40:44,936 INFO L226 Difference]: Without dead ends: 186 [2019-11-06 18:40:44,937 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 163 GetRequests, 113 SyntacticMatches, 0 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 528 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=767, Invalid=1885, Unknown=0, NotChecked=0, Total=2652 [2019-11-06 18:40:44,937 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 186 states. [2019-11-06 18:40:44,943 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 186 to 181. [2019-11-06 18:40:44,943 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 181 states. [2019-11-06 18:40:44,944 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 181 states to 181 states and 215 transitions. [2019-11-06 18:40:44,944 INFO L78 Accepts]: Start accepts. Automaton has 181 states and 215 transitions. Word has length 126 [2019-11-06 18:40:44,945 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:40:44,945 INFO L462 AbstractCegarLoop]: Abstraction has 181 states and 215 transitions. [2019-11-06 18:40:44,945 INFO L463 AbstractCegarLoop]: Interpolant automaton has 52 states. [2019-11-06 18:40:44,945 INFO L276 IsEmpty]: Start isEmpty. Operand 181 states and 215 transitions. [2019-11-06 18:40:44,946 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 132 [2019-11-06 18:40:44,946 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:40:44,946 INFO L410 BasicCegarLoop]: trace histogram [34, 34, 15, 15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:40:45,150 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 34 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:40:45,151 INFO L410 AbstractCegarLoop]: === Iteration 38 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:40:45,151 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:40:45,151 INFO L82 PathProgramCache]: Analyzing trace with hash 912852824, now seen corresponding path program 34 times [2019-11-06 18:40:45,151 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:40:45,151 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2101377971] [2019-11-06 18:40:45,151 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:40:45,174 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:40:45,954 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:40:45,968 INFO L134 CoverageAnalysis]: Checked inductivity of 1487 backedges. 0 proven. 1156 refuted. 0 times theorem prover too weak. 331 trivial. 0 not checked. [2019-11-06 18:40:45,969 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2101377971] [2019-11-06 18:40:45,969 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [695714078] [2019-11-06 18:40:45,969 INFO L92 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 35 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 35 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:40:46,089 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-11-06 18:40:46,090 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 18:40:46,092 INFO L256 TraceCheckSpWp]: Trace formula consists of 391 conjuncts, 36 conjunts are in the unsatisfiable core [2019-11-06 18:40:46,094 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:40:46,125 INFO L134 CoverageAnalysis]: Checked inductivity of 1487 backedges. 0 proven. 1156 refuted. 0 times theorem prover too weak. 331 trivial. 0 not checked. [2019-11-06 18:40:46,125 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:40:46,126 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [38, 37] total 39 [2019-11-06 18:40:46,126 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [129189930] [2019-11-06 18:40:46,126 INFO L442 AbstractCegarLoop]: Interpolant automaton has 39 states [2019-11-06 18:40:46,127 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:40:46,127 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2019-11-06 18:40:46,127 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=705, Invalid=777, Unknown=0, NotChecked=0, Total=1482 [2019-11-06 18:40:46,128 INFO L87 Difference]: Start difference. First operand 181 states and 215 transitions. Second operand 39 states. [2019-11-06 18:40:46,393 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:40:46,393 INFO L93 Difference]: Finished difference Result 290 states and 358 transitions. [2019-11-06 18:40:46,393 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2019-11-06 18:40:46,394 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 131 [2019-11-06 18:40:46,394 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:40:46,395 INFO L225 Difference]: With dead ends: 290 [2019-11-06 18:40:46,395 INFO L226 Difference]: Without dead ends: 184 [2019-11-06 18:40:46,396 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 169 GetRequests, 132 SyntacticMatches, 0 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 100 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=705, Invalid=777, Unknown=0, NotChecked=0, Total=1482 [2019-11-06 18:40:46,396 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 184 states. [2019-11-06 18:40:46,400 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 184 to 183. [2019-11-06 18:40:46,401 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 183 states. [2019-11-06 18:40:46,401 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 183 states to 183 states and 217 transitions. [2019-11-06 18:40:46,402 INFO L78 Accepts]: Start accepts. Automaton has 183 states and 217 transitions. Word has length 131 [2019-11-06 18:40:46,402 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:40:46,402 INFO L462 AbstractCegarLoop]: Abstraction has 183 states and 217 transitions. [2019-11-06 18:40:46,402 INFO L463 AbstractCegarLoop]: Interpolant automaton has 39 states. [2019-11-06 18:40:46,402 INFO L276 IsEmpty]: Start isEmpty. Operand 183 states and 217 transitions. [2019-11-06 18:40:46,403 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 134 [2019-11-06 18:40:46,403 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:40:46,403 INFO L410 BasicCegarLoop]: trace histogram [35, 35, 15, 15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]