/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/standard_two_index_09.i -------------------------------------------------------------------------------- This is Ultimate 0.1.24-fb55353 [2019-11-06 18:48:06,781 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-11-06 18:48:06,783 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-11-06 18:48:06,795 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2019-11-06 18:48:06,795 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2019-11-06 18:48:06,796 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2019-11-06 18:48:06,798 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2019-11-06 18:48:06,799 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2019-11-06 18:48:06,801 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2019-11-06 18:48:06,802 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2019-11-06 18:48:06,803 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2019-11-06 18:48:06,804 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2019-11-06 18:48:06,804 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-11-06 18:48:06,805 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-11-06 18:48:06,806 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-11-06 18:48:06,807 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-11-06 18:48:06,808 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-11-06 18:48:06,809 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-11-06 18:48:06,811 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-11-06 18:48:06,813 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-11-06 18:48:06,815 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-11-06 18:48:06,816 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-11-06 18:48:06,817 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-11-06 18:48:06,818 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-11-06 18:48:06,821 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2019-11-06 18:48:06,824 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2019-11-06 18:48:06,825 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2019-11-06 18:48:06,826 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2019-11-06 18:48:06,827 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2019-11-06 18:48:06,828 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2019-11-06 18:48:06,828 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2019-11-06 18:48:06,829 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2019-11-06 18:48:06,829 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2019-11-06 18:48:06,829 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-11-06 18:48:06,830 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-11-06 18:48:06,831 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-11-06 18:48:06,831 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 18:48:06,848 INFO L113 SettingsManager]: Loading preferences was successful [2019-11-06 18:48:06,849 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-11-06 18:48:06,850 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2019-11-06 18:48:06,850 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2019-11-06 18:48:06,850 INFO L138 SettingsManager]: * Use SBE=true [2019-11-06 18:48:06,850 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-11-06 18:48:06,851 INFO L138 SettingsManager]: * sizeof long=4 [2019-11-06 18:48:06,851 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2019-11-06 18:48:06,851 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-11-06 18:48:06,851 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-11-06 18:48:06,851 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-11-06 18:48:06,852 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-11-06 18:48:06,852 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-11-06 18:48:06,852 INFO L138 SettingsManager]: * sizeof long double=12 [2019-11-06 18:48:06,852 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-11-06 18:48:06,852 INFO L138 SettingsManager]: * Use constant arrays=true [2019-11-06 18:48:06,853 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-11-06 18:48:06,853 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-11-06 18:48:06,853 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-11-06 18:48:06,853 INFO L138 SettingsManager]: * To the following directory=./dump/ [2019-11-06 18:48:06,853 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2019-11-06 18:48:06,854 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-11-06 18:48:06,854 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-11-06 18:48:06,854 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-11-06 18:48:06,854 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-11-06 18:48:06,854 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2019-11-06 18:48:06,855 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-11-06 18:48:06,855 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-11-06 18:48:06,855 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2019-11-06 18:48:07,155 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-11-06 18:48:07,176 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-11-06 18:48:07,180 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-11-06 18:48:07,181 INFO L271 PluginConnector]: Initializing CDTParser... [2019-11-06 18:48:07,181 INFO L275 PluginConnector]: CDTParser initialized [2019-11-06 18:48:07,183 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/array-examples/standard_two_index_09.i [2019-11-06 18:48:07,261 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/c268bc655/5ab51c73e23c4e5f81d4538702e0b9ee/FLAGe6e91b0ab [2019-11-06 18:48:07,707 INFO L306 CDTParser]: Found 1 translation units. [2019-11-06 18:48:07,707 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/array-examples/standard_two_index_09.i [2019-11-06 18:48:07,712 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/c268bc655/5ab51c73e23c4e5f81d4538702e0b9ee/FLAGe6e91b0ab [2019-11-06 18:48:08,107 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/c268bc655/5ab51c73e23c4e5f81d4538702e0b9ee [2019-11-06 18:48:08,121 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-11-06 18:48:08,122 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2019-11-06 18:48:08,124 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-11-06 18:48:08,124 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-11-06 18:48:08,128 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-11-06 18:48:08,129 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.11 06:48:08" (1/1) ... [2019-11-06 18:48:08,132 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@68de5438 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 06:48:08, skipping insertion in model container [2019-11-06 18:48:08,132 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.11 06:48:08" (1/1) ... [2019-11-06 18:48:08,140 INFO L142 MainTranslator]: Starting translation in SV-COMP mode [2019-11-06 18:48:08,161 INFO L173 MainTranslator]: Built tables and reachable declarations [2019-11-06 18:48:08,380 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-11-06 18:48:08,385 INFO L188 MainTranslator]: Completed pre-run [2019-11-06 18:48:08,404 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-11-06 18:48:08,425 INFO L192 MainTranslator]: Completed translation [2019-11-06 18:48:08,425 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 06:48:08 WrapperNode [2019-11-06 18:48:08,426 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-11-06 18:48:08,427 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-11-06 18:48:08,427 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-11-06 18:48:08,427 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-11-06 18:48:08,518 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 06:48:08" (1/1) ... [2019-11-06 18:48:08,518 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 06:48:08" (1/1) ... [2019-11-06 18:48:08,527 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 06:48:08" (1/1) ... [2019-11-06 18:48:08,527 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 06:48:08" (1/1) ... [2019-11-06 18:48:08,534 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 06:48:08" (1/1) ... [2019-11-06 18:48:08,539 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 06:48:08" (1/1) ... [2019-11-06 18:48:08,541 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 06:48:08" (1/1) ... [2019-11-06 18:48:08,543 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-11-06 18:48:08,543 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-11-06 18:48:08,543 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-11-06 18:48:08,543 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-11-06 18:48:08,544 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 06:48:08" (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 18:48:08,602 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2019-11-06 18:48:08,602 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-11-06 18:48:08,602 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2019-11-06 18:48:08,602 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2019-11-06 18:48:08,602 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2019-11-06 18:48:08,602 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2019-11-06 18:48:08,603 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2019-11-06 18:48:08,603 INFO L130 BoogieDeclarations]: Found specification of procedure main [2019-11-06 18:48:08,603 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2019-11-06 18:48:08,603 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2019-11-06 18:48:08,603 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2019-11-06 18:48:08,603 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2019-11-06 18:48:08,603 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2019-11-06 18:48:08,604 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-11-06 18:48:08,858 INFO L279 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-11-06 18:48:08,858 INFO L284 CfgBuilder]: Removed 3 assume(true) statements. [2019-11-06 18:48:08,866 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.11 06:48:08 BoogieIcfgContainer [2019-11-06 18:48:08,867 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-11-06 18:48:08,871 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-11-06 18:48:08,871 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-11-06 18:48:08,879 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-11-06 18:48:08,879 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 06.11 06:48:08" (1/3) ... [2019-11-06 18:48:08,880 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7d5e95ee and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.11 06:48:08, skipping insertion in model container [2019-11-06 18:48:08,881 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 06:48:08" (2/3) ... [2019-11-06 18:48:08,881 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7d5e95ee and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.11 06:48:08, skipping insertion in model container [2019-11-06 18:48:08,881 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.11 06:48:08" (3/3) ... [2019-11-06 18:48:08,887 INFO L109 eAbstractionObserver]: Analyzing ICFG standard_two_index_09.i [2019-11-06 18:48:08,898 INFO L152 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-11-06 18:48:08,906 INFO L164 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-11-06 18:48:08,924 INFO L249 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-11-06 18:48:08,954 INFO L373 AbstractCegarLoop]: Interprodecural is true [2019-11-06 18:48:08,955 INFO L374 AbstractCegarLoop]: Hoare is true [2019-11-06 18:48:08,955 INFO L375 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-11-06 18:48:08,955 INFO L376 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-11-06 18:48:08,955 INFO L377 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-11-06 18:48:08,955 INFO L378 AbstractCegarLoop]: Difference is false [2019-11-06 18:48:08,955 INFO L379 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-11-06 18:48:08,955 INFO L383 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-11-06 18:48:08,972 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states. [2019-11-06 18:48:08,977 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2019-11-06 18:48:08,977 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:48:08,978 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:48:08,980 INFO L410 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:48:08,984 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:48:08,985 INFO L82 PathProgramCache]: Analyzing trace with hash -2029643862, now seen corresponding path program 1 times [2019-11-06 18:48:08,992 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:48:08,992 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [223915180] [2019-11-06 18:48:08,993 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:48:09,075 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:48:09,161 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:48:09,173 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 18:48:09,174 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [223915180] [2019-11-06 18:48:09,175 INFO L218 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-06 18:48:09,175 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2019-11-06 18:48:09,175 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [317151431] [2019-11-06 18:48:09,181 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-11-06 18:48:09,181 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:48:09,195 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-11-06 18:48:09,196 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-11-06 18:48:09,199 INFO L87 Difference]: Start difference. First operand 24 states. Second operand 3 states. [2019-11-06 18:48:09,308 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:48:09,308 INFO L93 Difference]: Finished difference Result 41 states and 52 transitions. [2019-11-06 18:48:09,309 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-11-06 18:48:09,310 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 15 [2019-11-06 18:48:09,311 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:48:09,319 INFO L225 Difference]: With dead ends: 41 [2019-11-06 18:48:09,320 INFO L226 Difference]: Without dead ends: 19 [2019-11-06 18:48:09,323 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 18:48:09,342 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2019-11-06 18:48:09,358 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2019-11-06 18:48:09,359 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2019-11-06 18:48:09,360 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 21 transitions. [2019-11-06 18:48:09,362 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 21 transitions. Word has length 15 [2019-11-06 18:48:09,363 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:48:09,363 INFO L462 AbstractCegarLoop]: Abstraction has 19 states and 21 transitions. [2019-11-06 18:48:09,363 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-11-06 18:48:09,363 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 21 transitions. [2019-11-06 18:48:09,364 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2019-11-06 18:48:09,364 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:48:09,365 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:48:09,365 INFO L410 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:48:09,365 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:48:09,366 INFO L82 PathProgramCache]: Analyzing trace with hash 905206694, now seen corresponding path program 1 times [2019-11-06 18:48:09,366 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:48:09,366 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1255181943] [2019-11-06 18:48:09,367 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:48:09,387 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:48:09,469 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:48:09,480 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 18:48:09,483 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1255181943] [2019-11-06 18:48:09,483 INFO L218 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-06 18:48:09,483 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2019-11-06 18:48:09,483 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1011865756] [2019-11-06 18:48:09,486 INFO L442 AbstractCegarLoop]: Interpolant automaton has 4 states [2019-11-06 18:48:09,487 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:48:09,487 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2019-11-06 18:48:09,487 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2019-11-06 18:48:09,488 INFO L87 Difference]: Start difference. First operand 19 states and 21 transitions. Second operand 4 states. [2019-11-06 18:48:09,584 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:48:09,584 INFO L93 Difference]: Finished difference Result 32 states and 36 transitions. [2019-11-06 18:48:09,585 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2019-11-06 18:48:09,585 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 15 [2019-11-06 18:48:09,585 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:48:09,587 INFO L225 Difference]: With dead ends: 32 [2019-11-06 18:48:09,587 INFO L226 Difference]: Without dead ends: 20 [2019-11-06 18:48:09,588 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 18:48:09,590 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2019-11-06 18:48:09,598 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2019-11-06 18:48:09,598 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2019-11-06 18:48:09,600 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 22 transitions. [2019-11-06 18:48:09,601 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 22 transitions. Word has length 15 [2019-11-06 18:48:09,601 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:48:09,601 INFO L462 AbstractCegarLoop]: Abstraction has 20 states and 22 transitions. [2019-11-06 18:48:09,602 INFO L463 AbstractCegarLoop]: Interpolant automaton has 4 states. [2019-11-06 18:48:09,602 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 22 transitions. [2019-11-06 18:48:09,603 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2019-11-06 18:48:09,603 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:48:09,603 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:48:09,604 INFO L410 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:48:09,605 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:48:09,606 INFO L82 PathProgramCache]: Analyzing trace with hash -764882998, now seen corresponding path program 1 times [2019-11-06 18:48:09,606 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:48:09,606 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [873932514] [2019-11-06 18:48:09,607 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:48:09,645 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:48:09,695 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:48:09,699 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 18:48:09,700 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [873932514] [2019-11-06 18:48:09,700 INFO L218 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-06 18:48:09,700 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2019-11-06 18:48:09,701 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [880886701] [2019-11-06 18:48:09,701 INFO L442 AbstractCegarLoop]: Interpolant automaton has 4 states [2019-11-06 18:48:09,701 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:48:09,702 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2019-11-06 18:48:09,704 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2019-11-06 18:48:09,704 INFO L87 Difference]: Start difference. First operand 20 states and 22 transitions. Second operand 4 states. [2019-11-06 18:48:09,788 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:48:09,788 INFO L93 Difference]: Finished difference Result 34 states and 38 transitions. [2019-11-06 18:48:09,788 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2019-11-06 18:48:09,789 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 16 [2019-11-06 18:48:09,789 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:48:09,791 INFO L225 Difference]: With dead ends: 34 [2019-11-06 18:48:09,791 INFO L226 Difference]: Without dead ends: 24 [2019-11-06 18:48:09,792 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 18:48:09,792 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2019-11-06 18:48:09,803 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 21. [2019-11-06 18:48:09,804 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2019-11-06 18:48:09,805 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 23 transitions. [2019-11-06 18:48:09,806 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 23 transitions. Word has length 16 [2019-11-06 18:48:09,806 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:48:09,806 INFO L462 AbstractCegarLoop]: Abstraction has 21 states and 23 transitions. [2019-11-06 18:48:09,806 INFO L463 AbstractCegarLoop]: Interpolant automaton has 4 states. [2019-11-06 18:48:09,806 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 23 transitions. [2019-11-06 18:48:09,808 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2019-11-06 18:48:09,808 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:48:09,808 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:48:09,809 INFO L410 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:48:09,809 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:48:09,809 INFO L82 PathProgramCache]: Analyzing trace with hash -59429947, now seen corresponding path program 1 times [2019-11-06 18:48:09,810 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:48:09,810 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1692341107] [2019-11-06 18:48:09,810 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:48:09,860 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:48:09,910 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:48:09,915 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-11-06 18:48:09,916 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1692341107] [2019-11-06 18:48:09,916 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1854746982] [2019-11-06 18:48:09,916 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 18:48:09,974 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:48:09,976 INFO L256 TraceCheckSpWp]: Trace formula consists of 79 conjuncts, 3 conjunts are in the unsatisfiable core [2019-11-06 18:48:09,983 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:48:10,038 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-11-06 18:48:10,039 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:48:10,039 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 4] total 7 [2019-11-06 18:48:10,039 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1254068551] [2019-11-06 18:48:10,040 INFO L442 AbstractCegarLoop]: Interpolant automaton has 7 states [2019-11-06 18:48:10,040 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:48:10,040 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2019-11-06 18:48:10,041 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=26, Unknown=0, NotChecked=0, Total=42 [2019-11-06 18:48:10,041 INFO L87 Difference]: Start difference. First operand 21 states and 23 transitions. Second operand 7 states. [2019-11-06 18:48:10,174 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:48:10,174 INFO L93 Difference]: Finished difference Result 43 states and 51 transitions. [2019-11-06 18:48:10,175 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2019-11-06 18:48:10,175 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 17 [2019-11-06 18:48:10,175 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:48:10,176 INFO L225 Difference]: With dead ends: 43 [2019-11-06 18:48:10,176 INFO L226 Difference]: Without dead ends: 30 [2019-11-06 18:48:10,177 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 17 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=16, Invalid=26, Unknown=0, NotChecked=0, Total=42 [2019-11-06 18:48:10,177 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2019-11-06 18:48:10,182 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 24. [2019-11-06 18:48:10,182 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2019-11-06 18:48:10,183 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 26 transitions. [2019-11-06 18:48:10,183 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 26 transitions. Word has length 17 [2019-11-06 18:48:10,183 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:48:10,184 INFO L462 AbstractCegarLoop]: Abstraction has 24 states and 26 transitions. [2019-11-06 18:48:10,184 INFO L463 AbstractCegarLoop]: Interpolant automaton has 7 states. [2019-11-06 18:48:10,184 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 26 transitions. [2019-11-06 18:48:10,184 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2019-11-06 18:48:10,185 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:48:10,185 INFO L410 BasicCegarLoop]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:48:10,388 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:48:10,388 INFO L410 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:48:10,389 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:48:10,389 INFO L82 PathProgramCache]: Analyzing trace with hash -1897825622, now seen corresponding path program 2 times [2019-11-06 18:48:10,389 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:48:10,389 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1048846534] [2019-11-06 18:48:10,390 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:48:10,414 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:48:10,495 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:48:10,504 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2019-11-06 18:48:10,504 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1048846534] [2019-11-06 18:48:10,505 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1453050974] [2019-11-06 18:48:10,505 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 18:48:10,559 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-11-06 18:48:10,559 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 18:48:10,560 INFO L256 TraceCheckSpWp]: Trace formula consists of 97 conjuncts, 5 conjunts are in the unsatisfiable core [2019-11-06 18:48:10,563 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:48:10,609 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2019-11-06 18:48:10,610 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:48:10,610 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 10 [2019-11-06 18:48:10,610 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1583046408] [2019-11-06 18:48:10,611 INFO L442 AbstractCegarLoop]: Interpolant automaton has 10 states [2019-11-06 18:48:10,611 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:48:10,611 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2019-11-06 18:48:10,612 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=37, Invalid=53, Unknown=0, NotChecked=0, Total=90 [2019-11-06 18:48:10,612 INFO L87 Difference]: Start difference. First operand 24 states and 26 transitions. Second operand 10 states. [2019-11-06 18:48:10,756 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:48:10,756 INFO L93 Difference]: Finished difference Result 51 states and 61 transitions. [2019-11-06 18:48:10,757 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2019-11-06 18:48:10,757 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 20 [2019-11-06 18:48:10,757 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:48:10,758 INFO L225 Difference]: With dead ends: 51 [2019-11-06 18:48:10,758 INFO L226 Difference]: Without dead ends: 37 [2019-11-06 18:48:10,759 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 18 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=37, Invalid=53, Unknown=0, NotChecked=0, Total=90 [2019-11-06 18:48:10,760 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2019-11-06 18:48:10,764 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 28. [2019-11-06 18:48:10,765 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2019-11-06 18:48:10,765 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 30 transitions. [2019-11-06 18:48:10,765 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 30 transitions. Word has length 20 [2019-11-06 18:48:10,766 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:48:10,766 INFO L462 AbstractCegarLoop]: Abstraction has 28 states and 30 transitions. [2019-11-06 18:48:10,766 INFO L463 AbstractCegarLoop]: Interpolant automaton has 10 states. [2019-11-06 18:48:10,766 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 30 transitions. [2019-11-06 18:48:10,766 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2019-11-06 18:48:10,767 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:48:10,767 INFO L410 BasicCegarLoop]: trace histogram [6, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:48:10,970 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:48:10,971 INFO L410 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:48:10,971 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:48:10,972 INFO L82 PathProgramCache]: Analyzing trace with hash -1456795255, now seen corresponding path program 3 times [2019-11-06 18:48:10,972 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:48:10,973 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [344317904] [2019-11-06 18:48:10,973 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:48:11,001 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:48:11,065 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:48:11,068 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2019-11-06 18:48:11,069 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [344317904] [2019-11-06 18:48:11,070 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1223624746] [2019-11-06 18:48:11,070 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 18:48:11,116 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2019-11-06 18:48:11,116 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 18:48:11,117 INFO L256 TraceCheckSpWp]: Trace formula consists of 109 conjuncts, 5 conjunts are in the unsatisfiable core [2019-11-06 18:48:11,119 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:48:11,131 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2019-11-06 18:48:11,131 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:48:11,132 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6] total 8 [2019-11-06 18:48:11,132 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [891257071] [2019-11-06 18:48:11,132 INFO L442 AbstractCegarLoop]: Interpolant automaton has 8 states [2019-11-06 18:48:11,133 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:48:11,133 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2019-11-06 18:48:11,133 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2019-11-06 18:48:11,133 INFO L87 Difference]: Start difference. First operand 28 states and 30 transitions. Second operand 8 states. [2019-11-06 18:48:11,287 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:48:11,288 INFO L93 Difference]: Finished difference Result 51 states and 58 transitions. [2019-11-06 18:48:11,288 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2019-11-06 18:48:11,288 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 24 [2019-11-06 18:48:11,289 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:48:11,289 INFO L225 Difference]: With dead ends: 51 [2019-11-06 18:48:11,290 INFO L226 Difference]: Without dead ends: 41 [2019-11-06 18:48:11,290 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 25 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2019-11-06 18:48:11,291 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2019-11-06 18:48:11,300 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 29. [2019-11-06 18:48:11,301 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2019-11-06 18:48:11,303 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 31 transitions. [2019-11-06 18:48:11,304 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 31 transitions. Word has length 24 [2019-11-06 18:48:11,306 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:48:11,306 INFO L462 AbstractCegarLoop]: Abstraction has 29 states and 31 transitions. [2019-11-06 18:48:11,306 INFO L463 AbstractCegarLoop]: Interpolant automaton has 8 states. [2019-11-06 18:48:11,306 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 31 transitions. [2019-11-06 18:48:11,307 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2019-11-06 18:48:11,307 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:48:11,308 INFO L410 BasicCegarLoop]: trace histogram [6, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:48:11,512 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:48:11,512 INFO L410 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:48:11,512 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:48:11,514 INFO L82 PathProgramCache]: Analyzing trace with hash -33873434, now seen corresponding path program 4 times [2019-11-06 18:48:11,514 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:48:11,514 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [110908661] [2019-11-06 18:48:11,515 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:48:11,559 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:48:11,658 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:48:11,665 INFO L134 CoverageAnalysis]: Checked inductivity of 31 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2019-11-06 18:48:11,666 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [110908661] [2019-11-06 18:48:11,666 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [486735007] [2019-11-06 18:48:11,666 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 18:48:11,726 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-11-06 18:48:11,727 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 18:48:11,728 INFO L256 TraceCheckSpWp]: Trace formula consists of 127 conjuncts, 8 conjunts are in the unsatisfiable core [2019-11-06 18:48:11,733 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:48:11,830 INFO L134 CoverageAnalysis]: Checked inductivity of 31 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2019-11-06 18:48:11,830 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:48:11,831 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9] total 15 [2019-11-06 18:48:11,831 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [161740051] [2019-11-06 18:48:11,831 INFO L442 AbstractCegarLoop]: Interpolant automaton has 15 states [2019-11-06 18:48:11,833 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:48:11,833 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2019-11-06 18:48:11,834 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=92, Invalid=118, Unknown=0, NotChecked=0, Total=210 [2019-11-06 18:48:11,834 INFO L87 Difference]: Start difference. First operand 29 states and 31 transitions. Second operand 15 states. [2019-11-06 18:48:12,009 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:48:12,010 INFO L93 Difference]: Finished difference Result 66 states and 80 transitions. [2019-11-06 18:48:12,010 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2019-11-06 18:48:12,010 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 25 [2019-11-06 18:48:12,011 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:48:12,011 INFO L225 Difference]: With dead ends: 66 [2019-11-06 18:48:12,011 INFO L226 Difference]: Without dead ends: 50 [2019-11-06 18:48:12,012 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 47 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=92, Invalid=118, Unknown=0, NotChecked=0, Total=210 [2019-11-06 18:48:12,012 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2019-11-06 18:48:12,026 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 35. [2019-11-06 18:48:12,026 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2019-11-06 18:48:12,029 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 37 transitions. [2019-11-06 18:48:12,029 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 37 transitions. Word has length 25 [2019-11-06 18:48:12,029 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:48:12,030 INFO L462 AbstractCegarLoop]: Abstraction has 35 states and 37 transitions. [2019-11-06 18:48:12,030 INFO L463 AbstractCegarLoop]: Interpolant automaton has 15 states. [2019-11-06 18:48:12,030 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 37 transitions. [2019-11-06 18:48:12,031 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2019-11-06 18:48:12,031 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:48:12,031 INFO L410 BasicCegarLoop]: trace histogram [11, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:48:12,236 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:48:12,237 INFO L410 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:48:12,237 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:48:12,237 INFO L82 PathProgramCache]: Analyzing trace with hash -1290022011, now seen corresponding path program 5 times [2019-11-06 18:48:12,237 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:48:12,237 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1362658672] [2019-11-06 18:48:12,238 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:48:12,270 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:48:12,338 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:48:12,340 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2019-11-06 18:48:12,341 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1362658672] [2019-11-06 18:48:12,341 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2060591455] [2019-11-06 18:48:12,341 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 18:48:12,771 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 7 check-sat command(s) [2019-11-06 18:48:12,772 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 18:48:12,775 INFO L256 TraceCheckSpWp]: Trace formula consists of 163 conjuncts, 13 conjunts are in the unsatisfiable core [2019-11-06 18:48:12,777 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:48:12,906 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2019-11-06 18:48:12,907 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:48:12,907 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 14] total 20 [2019-11-06 18:48:12,907 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1395956699] [2019-11-06 18:48:12,908 INFO L442 AbstractCegarLoop]: Interpolant automaton has 20 states [2019-11-06 18:48:12,908 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:48:12,908 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2019-11-06 18:48:12,909 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=172, Invalid=208, Unknown=0, NotChecked=0, Total=380 [2019-11-06 18:48:12,909 INFO L87 Difference]: Start difference. First operand 35 states and 37 transitions. Second operand 20 states. [2019-11-06 18:48:13,116 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:48:13,116 INFO L93 Difference]: Finished difference Result 76 states and 91 transitions. [2019-11-06 18:48:13,117 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2019-11-06 18:48:13,117 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 31 [2019-11-06 18:48:13,117 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:48:13,119 INFO L225 Difference]: With dead ends: 76 [2019-11-06 18:48:13,119 INFO L226 Difference]: Without dead ends: 59 [2019-11-06 18:48:13,119 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 22 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 112 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=172, Invalid=208, Unknown=0, NotChecked=0, Total=380 [2019-11-06 18:48:13,120 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2019-11-06 18:48:13,125 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 41. [2019-11-06 18:48:13,125 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2019-11-06 18:48:13,126 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 43 transitions. [2019-11-06 18:48:13,126 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 43 transitions. Word has length 31 [2019-11-06 18:48:13,127 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:48:13,127 INFO L462 AbstractCegarLoop]: Abstraction has 41 states and 43 transitions. [2019-11-06 18:48:13,127 INFO L463 AbstractCegarLoop]: Interpolant automaton has 20 states. [2019-11-06 18:48:13,127 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 43 transitions. [2019-11-06 18:48:13,128 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2019-11-06 18:48:13,128 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:48:13,128 INFO L410 BasicCegarLoop]: trace histogram [16, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:48:13,334 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:48:13,335 INFO L410 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:48:13,335 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:48:13,336 INFO L82 PathProgramCache]: Analyzing trace with hash 678305990, now seen corresponding path program 6 times [2019-11-06 18:48:13,336 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:48:13,337 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1962957139] [2019-11-06 18:48:13,337 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:48:13,369 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:48:13,447 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:48:13,450 INFO L134 CoverageAnalysis]: Checked inductivity of 157 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 136 trivial. 0 not checked. [2019-11-06 18:48:13,451 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1962957139] [2019-11-06 18:48:13,451 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1347763141] [2019-11-06 18:48:13,451 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 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 18:48:13,711 INFO L249 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2019-11-06 18:48:13,712 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 18:48:13,713 INFO L256 TraceCheckSpWp]: Trace formula consists of 175 conjuncts, 8 conjunts are in the unsatisfiable core [2019-11-06 18:48:13,716 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:48:13,728 INFO L134 CoverageAnalysis]: Checked inductivity of 157 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 136 trivial. 0 not checked. [2019-11-06 18:48:13,729 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:48:13,729 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9] total 11 [2019-11-06 18:48:13,729 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1918413501] [2019-11-06 18:48:13,730 INFO L442 AbstractCegarLoop]: Interpolant automaton has 11 states [2019-11-06 18:48:13,730 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:48:13,730 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2019-11-06 18:48:13,730 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=63, Unknown=0, NotChecked=0, Total=110 [2019-11-06 18:48:13,731 INFO L87 Difference]: Start difference. First operand 41 states and 43 transitions. Second operand 11 states. [2019-11-06 18:48:13,928 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:48:13,928 INFO L93 Difference]: Finished difference Result 73 states and 83 transitions. [2019-11-06 18:48:13,928 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2019-11-06 18:48:13,928 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 37 [2019-11-06 18:48:13,929 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:48:13,930 INFO L225 Difference]: With dead ends: 73 [2019-11-06 18:48:13,930 INFO L226 Difference]: Without dead ends: 63 [2019-11-06 18:48:13,930 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 38 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=47, Invalid=63, Unknown=0, NotChecked=0, Total=110 [2019-11-06 18:48:13,931 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2019-11-06 18:48:13,937 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 42. [2019-11-06 18:48:13,937 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2019-11-06 18:48:13,938 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 44 transitions. [2019-11-06 18:48:13,938 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 44 transitions. Word has length 37 [2019-11-06 18:48:13,938 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:48:13,938 INFO L462 AbstractCegarLoop]: Abstraction has 42 states and 44 transitions. [2019-11-06 18:48:13,938 INFO L463 AbstractCegarLoop]: Interpolant automaton has 11 states. [2019-11-06 18:48:13,939 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 44 transitions. [2019-11-06 18:48:13,939 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2019-11-06 18:48:13,939 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:48:13,940 INFO L410 BasicCegarLoop]: trace histogram [16, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:48:14,143 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:48:14,144 INFO L410 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:48:14,144 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:48:14,145 INFO L82 PathProgramCache]: Analyzing trace with hash 1729755721, now seen corresponding path program 7 times [2019-11-06 18:48:14,145 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:48:14,145 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [849363908] [2019-11-06 18:48:14,146 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:48:14,194 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:48:14,287 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:48:14,291 INFO L134 CoverageAnalysis]: Checked inductivity of 164 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 136 trivial. 0 not checked. [2019-11-06 18:48:14,291 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [849363908] [2019-11-06 18:48:14,291 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [629519864] [2019-11-06 18:48:14,291 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 18:48:14,352 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:48:14,353 INFO L256 TraceCheckSpWp]: Trace formula consists of 205 conjuncts, 18 conjunts are in the unsatisfiable core [2019-11-06 18:48:14,361 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:48:14,573 INFO L134 CoverageAnalysis]: Checked inductivity of 164 backedges. 0 proven. 136 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2019-11-06 18:48:14,573 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:48:14,573 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 19] total 27 [2019-11-06 18:48:14,574 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1926449338] [2019-11-06 18:48:14,574 INFO L442 AbstractCegarLoop]: Interpolant automaton has 27 states [2019-11-06 18:48:14,574 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:48:14,575 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2019-11-06 18:48:14,575 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=326, Invalid=376, Unknown=0, NotChecked=0, Total=702 [2019-11-06 18:48:14,576 INFO L87 Difference]: Start difference. First operand 42 states and 44 transitions. Second operand 27 states. [2019-11-06 18:48:14,882 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:48:14,883 INFO L93 Difference]: Finished difference Result 93 states and 112 transitions. [2019-11-06 18:48:14,883 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2019-11-06 18:48:14,883 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 38 [2019-11-06 18:48:14,883 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:48:14,884 INFO L225 Difference]: With dead ends: 93 [2019-11-06 18:48:14,884 INFO L226 Difference]: Without dead ends: 74 [2019-11-06 18:48:14,885 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 24 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 308 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=326, Invalid=376, Unknown=0, NotChecked=0, Total=702 [2019-11-06 18:48:14,886 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 74 states. [2019-11-06 18:48:14,892 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 74 to 50. [2019-11-06 18:48:14,892 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 50 states. [2019-11-06 18:48:14,893 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 52 transitions. [2019-11-06 18:48:14,893 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 52 transitions. Word has length 38 [2019-11-06 18:48:14,893 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:48:14,894 INFO L462 AbstractCegarLoop]: Abstraction has 50 states and 52 transitions. [2019-11-06 18:48:14,894 INFO L463 AbstractCegarLoop]: Interpolant automaton has 27 states. [2019-11-06 18:48:14,894 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 52 transitions. [2019-11-06 18:48:14,894 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2019-11-06 18:48:14,895 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:48:14,895 INFO L410 BasicCegarLoop]: trace histogram [23, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:48:15,107 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:48:15,108 INFO L410 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:48:15,108 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:48:15,109 INFO L82 PathProgramCache]: Analyzing trace with hash -53699638, now seen corresponding path program 8 times [2019-11-06 18:48:15,109 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:48:15,109 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1075881549] [2019-11-06 18:48:15,109 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:48:15,138 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:48:15,277 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:48:15,280 INFO L134 CoverageAnalysis]: Checked inductivity of 312 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 276 trivial. 0 not checked. [2019-11-06 18:48:15,282 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1075881549] [2019-11-06 18:48:15,282 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [662212179] [2019-11-06 18:48:15,282 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 18:48:15,346 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-11-06 18:48:15,346 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 18:48:15,347 INFO L256 TraceCheckSpWp]: Trace formula consists of 253 conjuncts, 25 conjunts are in the unsatisfiable core [2019-11-06 18:48:15,350 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:48:15,580 INFO L134 CoverageAnalysis]: Checked inductivity of 312 backedges. 0 proven. 276 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2019-11-06 18:48:15,580 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:48:15,580 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 26] total 34 [2019-11-06 18:48:15,581 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2126918635] [2019-11-06 18:48:15,581 INFO L442 AbstractCegarLoop]: Interpolant automaton has 34 states [2019-11-06 18:48:15,581 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:48:15,582 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2019-11-06 18:48:15,582 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=529, Invalid=593, Unknown=0, NotChecked=0, Total=1122 [2019-11-06 18:48:15,583 INFO L87 Difference]: Start difference. First operand 50 states and 52 transitions. Second operand 34 states. [2019-11-06 18:48:15,865 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:48:15,865 INFO L93 Difference]: Finished difference Result 105 states and 125 transitions. [2019-11-06 18:48:15,866 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2019-11-06 18:48:15,866 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 46 [2019-11-06 18:48:15,866 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:48:15,867 INFO L225 Difference]: With dead ends: 105 [2019-11-06 18:48:15,867 INFO L226 Difference]: Without dead ends: 85 [2019-11-06 18:48:15,868 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 26 SyntacticMatches, 0 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 589 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=529, Invalid=593, Unknown=0, NotChecked=0, Total=1122 [2019-11-06 18:48:15,869 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 85 states. [2019-11-06 18:48:15,876 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 85 to 58. [2019-11-06 18:48:15,877 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 58 states. [2019-11-06 18:48:15,877 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 60 transitions. [2019-11-06 18:48:15,877 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 60 transitions. Word has length 46 [2019-11-06 18:48:15,878 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:48:15,878 INFO L462 AbstractCegarLoop]: Abstraction has 58 states and 60 transitions. [2019-11-06 18:48:15,878 INFO L463 AbstractCegarLoop]: Interpolant automaton has 34 states. [2019-11-06 18:48:15,878 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 60 transitions. [2019-11-06 18:48:15,879 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2019-11-06 18:48:15,879 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:48:15,879 INFO L410 BasicCegarLoop]: trace histogram [30, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:48:16,083 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:48:16,083 INFO L410 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:48:16,083 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:48:16,084 INFO L82 PathProgramCache]: Analyzing trace with hash 1314604649, now seen corresponding path program 9 times [2019-11-06 18:48:16,084 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:48:16,084 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [467929481] [2019-11-06 18:48:16,084 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:48:16,113 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:48:16,226 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:48:16,232 INFO L134 CoverageAnalysis]: Checked inductivity of 510 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 465 trivial. 0 not checked. [2019-11-06 18:48:16,232 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [467929481] [2019-11-06 18:48:16,233 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1802715402] [2019-11-06 18:48:16,233 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 18:48:16,792 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2019-11-06 18:48:16,792 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 18:48:16,794 INFO L256 TraceCheckSpWp]: Trace formula consists of 181 conjuncts, 11 conjunts are in the unsatisfiable core [2019-11-06 18:48:16,797 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:48:16,844 INFO L134 CoverageAnalysis]: Checked inductivity of 510 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 465 trivial. 0 not checked. [2019-11-06 18:48:16,845 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:48:16,845 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12] total 14 [2019-11-06 18:48:16,845 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1193168437] [2019-11-06 18:48:16,846 INFO L442 AbstractCegarLoop]: Interpolant automaton has 14 states [2019-11-06 18:48:16,847 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:48:16,847 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2019-11-06 18:48:16,847 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=80, Invalid=102, Unknown=0, NotChecked=0, Total=182 [2019-11-06 18:48:16,848 INFO L87 Difference]: Start difference. First operand 58 states and 60 transitions. Second operand 14 states. [2019-11-06 18:48:17,008 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:48:17,008 INFO L93 Difference]: Finished difference Result 99 states and 112 transitions. [2019-11-06 18:48:17,009 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2019-11-06 18:48:17,009 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 54 [2019-11-06 18:48:17,009 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:48:17,011 INFO L225 Difference]: With dead ends: 99 [2019-11-06 18:48:17,011 INFO L226 Difference]: Without dead ends: 89 [2019-11-06 18:48:17,012 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 67 GetRequests, 55 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=80, Invalid=102, Unknown=0, NotChecked=0, Total=182 [2019-11-06 18:48:17,012 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 89 states. [2019-11-06 18:48:17,019 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 89 to 59. [2019-11-06 18:48:17,019 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 59 states. [2019-11-06 18:48:17,020 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 61 transitions. [2019-11-06 18:48:17,020 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 61 transitions. Word has length 54 [2019-11-06 18:48:17,020 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:48:17,020 INFO L462 AbstractCegarLoop]: Abstraction has 59 states and 61 transitions. [2019-11-06 18:48:17,020 INFO L463 AbstractCegarLoop]: Interpolant automaton has 14 states. [2019-11-06 18:48:17,021 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 61 transitions. [2019-11-06 18:48:17,021 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2019-11-06 18:48:17,021 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:48:17,022 INFO L410 BasicCegarLoop]: trace histogram [30, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:48:17,225 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:48:17,226 INFO L410 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:48:17,226 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:48:17,226 INFO L82 PathProgramCache]: Analyzing trace with hash -19822330, now seen corresponding path program 10 times [2019-11-06 18:48:17,227 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:48:17,227 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [366833734] [2019-11-06 18:48:17,227 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:48:17,256 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:48:17,373 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:48:17,377 INFO L134 CoverageAnalysis]: Checked inductivity of 520 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 465 trivial. 0 not checked. [2019-11-06 18:48:17,378 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [366833734] [2019-11-06 18:48:17,378 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [401929149] [2019-11-06 18:48:17,378 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 18:48:17,455 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-11-06 18:48:17,455 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 18:48:17,457 INFO L256 TraceCheckSpWp]: Trace formula consists of 307 conjuncts, 32 conjunts are in the unsatisfiable core [2019-11-06 18:48:17,462 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:48:17,744 INFO L134 CoverageAnalysis]: Checked inductivity of 520 backedges. 0 proven. 465 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2019-11-06 18:48:17,744 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:48:17,744 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 33] total 42 [2019-11-06 18:48:17,745 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [290103462] [2019-11-06 18:48:17,745 INFO L442 AbstractCegarLoop]: Interpolant automaton has 42 states [2019-11-06 18:48:17,745 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:48:17,746 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2019-11-06 18:48:17,747 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=821, Invalid=901, Unknown=0, NotChecked=0, Total=1722 [2019-11-06 18:48:17,747 INFO L87 Difference]: Start difference. First operand 59 states and 61 transitions. Second operand 42 states. [2019-11-06 18:48:18,112 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:48:18,113 INFO L93 Difference]: Finished difference Result 123 states and 146 transitions. [2019-11-06 18:48:18,113 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2019-11-06 18:48:18,113 INFO L78 Accepts]: Start accepts. Automaton has 42 states. Word has length 55 [2019-11-06 18:48:18,114 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:48:18,115 INFO L225 Difference]: With dead ends: 123 [2019-11-06 18:48:18,116 INFO L226 Difference]: Without dead ends: 101 [2019-11-06 18:48:18,117 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 69 GetRequests, 29 SyntacticMatches, 0 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1007 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=821, Invalid=901, Unknown=0, NotChecked=0, Total=1722 [2019-11-06 18:48:18,117 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 101 states. [2019-11-06 18:48:18,124 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 101 to 68. [2019-11-06 18:48:18,125 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 68 states. [2019-11-06 18:48:18,125 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 70 transitions. [2019-11-06 18:48:18,126 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 70 transitions. Word has length 55 [2019-11-06 18:48:18,126 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:48:18,126 INFO L462 AbstractCegarLoop]: Abstraction has 68 states and 70 transitions. [2019-11-06 18:48:18,126 INFO L463 AbstractCegarLoop]: Interpolant automaton has 42 states. [2019-11-06 18:48:18,126 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 70 transitions. [2019-11-06 18:48:18,127 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2019-11-06 18:48:18,127 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:48:18,127 INFO L410 BasicCegarLoop]: trace histogram [38, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:48:18,343 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:48:18,344 INFO L410 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:48:18,344 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:48:18,345 INFO L82 PathProgramCache]: Analyzing trace with hash 1728612361, now seen corresponding path program 11 times [2019-11-06 18:48:18,345 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:48:18,345 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1844314758] [2019-11-06 18:48:18,345 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:48:18,382 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:48:18,525 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:48:18,530 INFO L134 CoverageAnalysis]: Checked inductivity of 807 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 741 trivial. 0 not checked. [2019-11-06 18:48:18,530 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1844314758] [2019-11-06 18:48:18,531 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [311221036] [2019-11-06 18:48:18,531 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