java -Xmx8000000000 -jar /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data --generate-csv --csv-dir csv -tc ../../../trunk/examples/toolchains/AutomizerCInline.xml -s ../../../trunk/examples/settings/ai/taipanbench/svcomp-Reach-64bit-RubberTaipan_Default-OldIcfg.epf -i ../../../trunk/examples/svcomp/loop-invgen/string_concat-noarr_true-unreach-call_true-termination.i -------------------------------------------------------------------------------- This is Ultimate 0.1.23-3142e50-m [2018-09-10 10:14:22,124 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-09-10 10:14:22,126 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-09-10 10:14:22,137 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-09-10 10:14:22,138 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-09-10 10:14:22,139 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-09-10 10:14:22,140 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-09-10 10:14:22,142 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-09-10 10:14:22,144 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-09-10 10:14:22,145 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-09-10 10:14:22,145 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-09-10 10:14:22,146 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-09-10 10:14:22,147 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2018-09-10 10:14:22,148 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-09-10 10:14:22,149 INFO L174 SettingsManager]: Resetting ChcToBoogie preferences to default values [2018-09-10 10:14:22,150 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-09-10 10:14:22,151 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-09-10 10:14:22,152 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-09-10 10:14:22,154 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-09-10 10:14:22,156 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-09-10 10:14:22,157 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-09-10 10:14:22,158 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-09-10 10:14:22,160 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2018-09-10 10:14:22,161 INFO L177 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2018-09-10 10:14:22,161 INFO L174 SettingsManager]: Resetting TreeAutomizer preferences to default values [2018-09-10 10:14:22,162 INFO L174 SettingsManager]: Resetting IcfgTransformer preferences to default values [2018-09-10 10:14:22,163 INFO L174 SettingsManager]: Resetting Boogie Printer preferences to default values [2018-09-10 10:14:22,164 INFO L174 SettingsManager]: Resetting ReqPrinter preferences to default values [2018-09-10 10:14:22,165 INFO L174 SettingsManager]: Resetting Witness Printer preferences to default values [2018-09-10 10:14:22,166 INFO L177 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2018-09-10 10:14:22,166 INFO L174 SettingsManager]: Resetting CDTParser preferences to default values [2018-09-10 10:14:22,167 INFO L177 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... 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[2018-09-10 10:14:22,169 INFO L98 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/ai/taipanbench/svcomp-Reach-64bit-RubberTaipan_Default-OldIcfg.epf [2018-09-10 10:14:22,195 INFO L110 SettingsManager]: Loading preferences was successful [2018-09-10 10:14:22,196 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-09-10 10:14:22,196 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-09-10 10:14:22,197 INFO L133 SettingsManager]: * User list type=DISABLED [2018-09-10 10:14:22,197 INFO L133 SettingsManager]: * calls to implemented procedures=false [2018-09-10 10:14:22,197 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-09-10 10:14:22,197 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2018-09-10 10:14:22,197 INFO L133 SettingsManager]: * Abstract domain=CompoundDomain [2018-09-10 10:14:22,197 INFO L133 SettingsManager]: * Log string format=TERM [2018-09-10 10:14:22,198 INFO L133 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2018-09-10 10:14:22,198 INFO L133 SettingsManager]: * Interval Domain=false [2018-09-10 10:14:22,199 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-09-10 10:14:22,199 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-09-10 10:14:22,199 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-09-10 10:14:22,200 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-09-10 10:14:22,200 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-09-10 10:14:22,200 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-09-10 10:14:22,200 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-09-10 10:14:22,200 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-09-10 10:14:22,201 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-09-10 10:14:22,201 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-09-10 10:14:22,201 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-09-10 10:14:22,201 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-09-10 10:14:22,203 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-09-10 10:14:22,203 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-09-10 10:14:22,203 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-09-10 10:14:22,204 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-09-10 10:14:22,204 INFO L133 SettingsManager]: * Trace refinement strategy=RUBBER_TAIPAN [2018-09-10 10:14:22,204 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-09-10 10:14:22,204 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-09-10 10:14:22,204 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-09-10 10:14:22,205 INFO L133 SettingsManager]: * To the following directory=dump/ [2018-09-10 10:14:22,205 INFO L133 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2018-09-10 10:14:22,251 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-09-10 10:14:22,266 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-09-10 10:14:22,272 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-09-10 10:14:22,274 INFO L271 PluginConnector]: Initializing CDTParser... [2018-09-10 10:14:22,274 INFO L276 PluginConnector]: CDTParser initialized [2018-09-10 10:14:22,275 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-invgen/string_concat-noarr_true-unreach-call_true-termination.i [2018-09-10 10:14:22,641 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/1e62cce9c/e441a88152dd48c0b4896f37dcdee0a6/FLAG6c3918267 [2018-09-10 10:14:22,806 INFO L276 CDTParser]: Found 1 translation units. [2018-09-10 10:14:22,807 INFO L158 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-invgen/string_concat-noarr_true-unreach-call_true-termination.i [2018-09-10 10:14:22,813 INFO L324 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/1e62cce9c/e441a88152dd48c0b4896f37dcdee0a6/FLAG6c3918267 [2018-09-10 10:14:22,830 INFO L332 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/1e62cce9c/e441a88152dd48c0b4896f37dcdee0a6 [2018-09-10 10:14:22,844 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-09-10 10:14:22,847 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2018-09-10 10:14:22,851 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-09-10 10:14:22,852 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-09-10 10:14:22,858 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-09-10 10:14:22,860 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 10.09 10:14:22" (1/1) ... [2018-09-10 10:14:22,863 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@172261e3 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 10.09 10:14:22, skipping insertion in model container [2018-09-10 10:14:22,863 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 10.09 10:14:22" (1/1) ... [2018-09-10 10:14:23,045 INFO L180 PRDispatcher]: Starting pre-run dispatcher in SV-COMP mode [2018-09-10 10:14:23,081 INFO L175 PostProcessor]: Settings: Checked method=main [2018-09-10 10:14:23,100 INFO L431 MainDispatcher]: Starting main dispatcher in SV-COMP mode [2018-09-10 10:14:23,108 INFO L175 PostProcessor]: Settings: Checked method=main [2018-09-10 10:14:23,130 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 10.09 10:14:23 WrapperNode [2018-09-10 10:14:23,130 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-09-10 10:14:23,131 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-09-10 10:14:23,131 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-09-10 10:14:23,131 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-09-10 10:14:23,141 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 10.09 10:14:23" (1/1) ... [2018-09-10 10:14:23,148 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 10.09 10:14:23" (1/1) ... [2018-09-10 10:14:23,155 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-09-10 10:14:23,156 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-09-10 10:14:23,156 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-09-10 10:14:23,156 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-09-10 10:14:23,167 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 10.09 10:14:23" (1/1) ... [2018-09-10 10:14:23,167 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 10.09 10:14:23" (1/1) ... [2018-09-10 10:14:23,168 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 10.09 10:14:23" (1/1) ... [2018-09-10 10:14:23,168 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 10.09 10:14:23" (1/1) ... [2018-09-10 10:14:23,171 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 10.09 10:14:23" (1/1) ... [2018-09-10 10:14:23,177 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 10.09 10:14:23" (1/1) ... [2018-09-10 10:14:23,180 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 10.09 10:14:23" (1/1) ... [2018-09-10 10:14:23,182 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-09-10 10:14:23,182 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-09-10 10:14:23,182 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-09-10 10:14:23,182 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-09-10 10:14:23,183 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 10.09 10:14:23" (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 [2018-09-10 10:14:23,256 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-09-10 10:14:23,256 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-09-10 10:14:23,257 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-09-10 10:14:23,257 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-09-10 10:14:23,257 INFO L130 BoogieDeclarations]: Found specification of procedure main [2018-09-10 10:14:23,257 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2018-09-10 10:14:23,257 INFO L130 BoogieDeclarations]: Found specification of procedure __U_MULTI_f_storage_repos_ultimate_trunk_examples_svcomp_loop_invgen_string_concat_noarr_true_unreach_call_true_termination_i____VERIFIER_assert [2018-09-10 10:14:23,258 INFO L138 BoogieDeclarations]: Found implementation of procedure __U_MULTI_f_storage_repos_ultimate_trunk_examples_svcomp_loop_invgen_string_concat_noarr_true_unreach_call_true_termination_i____VERIFIER_assert [2018-09-10 10:14:23,580 INFO L353 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-09-10 10:14:23,581 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 10.09 10:14:23 BoogieIcfgContainer [2018-09-10 10:14:23,581 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-09-10 10:14:23,582 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-09-10 10:14:23,582 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-09-10 10:14:23,585 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-09-10 10:14:23,586 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 10.09 10:14:22" (1/3) ... [2018-09-10 10:14:23,586 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@180e576 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 10.09 10:14:23, skipping insertion in model container [2018-09-10 10:14:23,587 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 10.09 10:14:23" (2/3) ... [2018-09-10 10:14:23,587 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@180e576 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 10.09 10:14:23, skipping insertion in model container [2018-09-10 10:14:23,587 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 10.09 10:14:23" (3/3) ... [2018-09-10 10:14:23,589 INFO L112 eAbstractionObserver]: Analyzing ICFG string_concat-noarr_true-unreach-call_true-termination.i [2018-09-10 10:14:23,599 INFO L137 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-09-10 10:14:23,607 INFO L149 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-09-10 10:14:23,653 INFO L130 ementStrategyFactory]: Using default assertion order modulation [2018-09-10 10:14:23,654 INFO L381 AbstractCegarLoop]: Interprodecural is true [2018-09-10 10:14:23,654 INFO L382 AbstractCegarLoop]: Hoare is true [2018-09-10 10:14:23,654 INFO L383 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-09-10 10:14:23,655 INFO L384 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-09-10 10:14:23,655 INFO L385 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-09-10 10:14:23,655 INFO L386 AbstractCegarLoop]: Difference is false [2018-09-10 10:14:23,655 INFO L387 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-09-10 10:14:23,655 INFO L392 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-09-10 10:14:23,674 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states. [2018-09-10 10:14:23,681 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2018-09-10 10:14:23,681 INFO L368 BasicCegarLoop]: Found error trace [2018-09-10 10:14:23,682 INFO L376 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-09-10 10:14:23,684 INFO L423 AbstractCegarLoop]: === Iteration 1 === [__U_MULTI_f_storage_repos_ultimate_trunk_examples_svcomp_loop_invgen_string_concat_noarr_true_unreach_call_true_termination_i____VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-09-10 10:14:23,689 INFO L82 PathProgramCache]: Analyzing trace with hash -745796184, now seen corresponding path program 1 times [2018-09-10 10:14:23,692 INFO L69 tionRefinementEngine]: Using refinement strategy RubberTaipanRefinementStrategy [2018-09-10 10:14:23,746 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-10 10:14:23,746 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-10 10:14:23,746 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-10 10:14:23,746 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-09-10 10:14:23,771 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-10 10:14:23,799 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:14:23,801 INFO L313 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-09-10 10:14:23,802 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-09-10 10:14:23,802 INFO L265 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-09-10 10:14:23,806 INFO L459 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-09-10 10:14:23,818 INFO L147 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-09-10 10:14:23,819 INFO L148 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-09-10 10:14:23,821 INFO L87 Difference]: Start difference. First operand 27 states. Second operand 2 states. [2018-09-10 10:14:23,845 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-10 10:14:23,845 INFO L93 Difference]: Finished difference Result 45 states and 54 transitions. [2018-09-10 10:14:23,845 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-09-10 10:14:23,847 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 14 [2018-09-10 10:14:23,847 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-10 10:14:23,856 INFO L225 Difference]: With dead ends: 45 [2018-09-10 10:14:23,856 INFO L226 Difference]: Without dead ends: 19 [2018-09-10 10:14:23,860 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-09-10 10:14:23,879 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2018-09-10 10:14:23,896 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2018-09-10 10:14:23,897 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2018-09-10 10:14:23,898 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 20 transitions. [2018-09-10 10:14:23,900 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 20 transitions. Word has length 14 [2018-09-10 10:14:23,900 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-10 10:14:23,900 INFO L480 AbstractCegarLoop]: Abstraction has 19 states and 20 transitions. [2018-09-10 10:14:23,900 INFO L481 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-09-10 10:14:23,900 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 20 transitions. [2018-09-10 10:14:23,901 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2018-09-10 10:14:23,901 INFO L368 BasicCegarLoop]: Found error trace [2018-09-10 10:14:23,902 INFO L376 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-09-10 10:14:23,902 INFO L423 AbstractCegarLoop]: === Iteration 2 === [__U_MULTI_f_storage_repos_ultimate_trunk_examples_svcomp_loop_invgen_string_concat_noarr_true_unreach_call_true_termination_i____VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-09-10 10:14:23,902 INFO L82 PathProgramCache]: Analyzing trace with hash 800081396, now seen corresponding path program 1 times [2018-09-10 10:14:23,903 INFO L69 tionRefinementEngine]: Using refinement strategy RubberTaipanRefinementStrategy [2018-09-10 10:14:23,904 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-10 10:14:23,904 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-10 10:14:23,904 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-10 10:14:23,905 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-09-10 10:14:23,922 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-10 10:14:24,118 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:14:24,118 INFO L313 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-09-10 10:14:24,119 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2018-09-10 10:14:24,119 INFO L265 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-09-10 10:14:24,121 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-09-10 10:14:24,121 INFO L147 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-09-10 10:14:24,121 INFO L148 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2018-09-10 10:14:24,122 INFO L87 Difference]: Start difference. First operand 19 states and 20 transitions. Second operand 5 states. [2018-09-10 10:14:24,262 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-10 10:14:24,262 INFO L93 Difference]: Finished difference Result 32 states and 34 transitions. [2018-09-10 10:14:24,263 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-09-10 10:14:24,263 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 18 [2018-09-10 10:14:24,263 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-10 10:14:24,264 INFO L225 Difference]: With dead ends: 32 [2018-09-10 10:14:24,264 INFO L226 Difference]: Without dead ends: 26 [2018-09-10 10:14:24,265 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2018-09-10 10:14:24,266 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2018-09-10 10:14:24,270 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2018-09-10 10:14:24,270 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2018-09-10 10:14:24,271 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 28 transitions. [2018-09-10 10:14:24,272 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 28 transitions. Word has length 18 [2018-09-10 10:14:24,272 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-10 10:14:24,272 INFO L480 AbstractCegarLoop]: Abstraction has 26 states and 28 transitions. [2018-09-10 10:14:24,272 INFO L481 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-09-10 10:14:24,273 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 28 transitions. [2018-09-10 10:14:24,273 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2018-09-10 10:14:24,274 INFO L368 BasicCegarLoop]: Found error trace [2018-09-10 10:14:24,274 INFO L376 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-09-10 10:14:24,274 INFO L423 AbstractCegarLoop]: === Iteration 3 === [__U_MULTI_f_storage_repos_ultimate_trunk_examples_svcomp_loop_invgen_string_concat_noarr_true_unreach_call_true_termination_i____VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-09-10 10:14:24,275 INFO L82 PathProgramCache]: Analyzing trace with hash 1097925811, now seen corresponding path program 1 times [2018-09-10 10:14:24,275 INFO L69 tionRefinementEngine]: Using refinement strategy RubberTaipanRefinementStrategy [2018-09-10 10:14:24,276 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-10 10:14:24,276 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-10 10:14:24,276 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-10 10:14:24,276 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-09-10 10:14:24,286 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-10 10:14:24,390 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2018-09-10 10:14:24,390 INFO L313 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-09-10 10:14:24,390 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2018-09-10 10:14:24,391 INFO L265 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-09-10 10:14:24,392 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-09-10 10:14:24,392 INFO L147 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-09-10 10:14:24,392 INFO L148 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2018-09-10 10:14:24,393 INFO L87 Difference]: Start difference. First operand 26 states and 28 transitions. Second operand 5 states. [2018-09-10 10:14:24,606 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-10 10:14:24,606 INFO L93 Difference]: Finished difference Result 35 states and 37 transitions. [2018-09-10 10:14:24,608 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-09-10 10:14:24,608 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 21 [2018-09-10 10:14:24,610 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-10 10:14:24,610 INFO L225 Difference]: With dead ends: 35 [2018-09-10 10:14:24,610 INFO L226 Difference]: Without dead ends: 29 [2018-09-10 10:14:24,611 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2018-09-10 10:14:24,613 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2018-09-10 10:14:24,616 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 22. [2018-09-10 10:14:24,621 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2018-09-10 10:14:24,623 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 23 transitions. [2018-09-10 10:14:24,623 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 23 transitions. Word has length 21 [2018-09-10 10:14:24,624 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-10 10:14:24,624 INFO L480 AbstractCegarLoop]: Abstraction has 22 states and 23 transitions. [2018-09-10 10:14:24,624 INFO L481 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-09-10 10:14:24,624 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 23 transitions. [2018-09-10 10:14:24,625 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2018-09-10 10:14:24,625 INFO L368 BasicCegarLoop]: Found error trace [2018-09-10 10:14:24,625 INFO L376 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-09-10 10:14:24,625 INFO L423 AbstractCegarLoop]: === Iteration 4 === [__U_MULTI_f_storage_repos_ultimate_trunk_examples_svcomp_loop_invgen_string_concat_noarr_true_unreach_call_true_termination_i____VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-09-10 10:14:24,626 INFO L82 PathProgramCache]: Analyzing trace with hash -278190259, now seen corresponding path program 1 times [2018-09-10 10:14:24,626 INFO L69 tionRefinementEngine]: Using refinement strategy RubberTaipanRefinementStrategy [2018-09-10 10:14:24,627 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-10 10:14:24,627 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-10 10:14:24,627 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-10 10:14:24,629 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-09-10 10:14:24,652 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-10 10:14:24,809 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:14:24,809 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-10 10:14:24,810 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-09-10 10:14:24,826 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-10 10:14:24,827 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-09-10 10:14:24,855 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-10 10:14:24,864 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-10 10:14:24,951 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:14:24,952 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-10 10:14:25,064 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:14:25,086 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-10 10:14:25,086 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4nyu Starting monitored process 3 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-09-10 10:14:25,103 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-10 10:14:25,103 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-09-10 10:14:25,126 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-10 10:14:25,131 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-10 10:14:25,145 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:14:25,145 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-10 10:14:25,204 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:14:25,206 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-09-10 10:14:25,206 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6, 6, 6] total 12 [2018-09-10 10:14:25,207 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-09-10 10:14:25,207 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2018-09-10 10:14:25,208 INFO L147 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2018-09-10 10:14:25,209 INFO L148 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=94, Unknown=0, NotChecked=0, Total=132 [2018-09-10 10:14:25,211 INFO L87 Difference]: Start difference. First operand 22 states and 23 transitions. Second operand 8 states. [2018-09-10 10:14:25,359 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-10 10:14:25,359 INFO L93 Difference]: Finished difference Result 63 states and 70 transitions. [2018-09-10 10:14:25,360 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2018-09-10 10:14:25,360 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 21 [2018-09-10 10:14:25,361 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-10 10:14:25,362 INFO L225 Difference]: With dead ends: 63 [2018-09-10 10:14:25,362 INFO L226 Difference]: Without dead ends: 53 [2018-09-10 10:14:25,363 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 89 GetRequests, 78 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=44, Invalid=112, Unknown=0, NotChecked=0, Total=156 [2018-09-10 10:14:25,363 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2018-09-10 10:14:25,368 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 39. [2018-09-10 10:14:25,368 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2018-09-10 10:14:25,369 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 42 transitions. [2018-09-10 10:14:25,370 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 42 transitions. Word has length 21 [2018-09-10 10:14:25,370 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-10 10:14:25,370 INFO L480 AbstractCegarLoop]: Abstraction has 39 states and 42 transitions. [2018-09-10 10:14:25,371 INFO L481 AbstractCegarLoop]: Interpolant automaton has 8 states. [2018-09-10 10:14:25,371 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 42 transitions. [2018-09-10 10:14:25,372 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2018-09-10 10:14:25,372 INFO L368 BasicCegarLoop]: Found error trace [2018-09-10 10:14:25,372 INFO L376 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-09-10 10:14:25,372 INFO L423 AbstractCegarLoop]: === Iteration 5 === [__U_MULTI_f_storage_repos_ultimate_trunk_examples_svcomp_loop_invgen_string_concat_noarr_true_unreach_call_true_termination_i____VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-09-10 10:14:25,373 INFO L82 PathProgramCache]: Analyzing trace with hash -2006845708, now seen corresponding path program 1 times [2018-09-10 10:14:25,373 INFO L69 tionRefinementEngine]: Using refinement strategy RubberTaipanRefinementStrategy [2018-09-10 10:14:25,374 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-10 10:14:25,374 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-10 10:14:25,374 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-10 10:14:25,374 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-09-10 10:14:25,387 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-10 10:14:25,598 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:14:25,599 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-10 10:14:25,599 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-09-10 10:14:25,611 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-10 10:14:25,612 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-09-10 10:14:25,635 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-10 10:14:25,638 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-10 10:14:25,649 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:14:25,649 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-10 10:14:26,114 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:14:26,134 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-10 10:14:26,134 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4nyu Starting monitored process 5 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-09-10 10:14:26,150 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-10 10:14:26,150 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-09-10 10:14:26,174 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-10 10:14:26,179 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-10 10:14:26,188 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:14:26,188 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-10 10:14:26,224 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:14:26,228 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-09-10 10:14:26,228 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9, 9, 9] total 16 [2018-09-10 10:14:26,228 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-09-10 10:14:26,229 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2018-09-10 10:14:26,229 INFO L147 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2018-09-10 10:14:26,232 INFO L148 InterpolantAutomaton]: CoverageRelationStatistics Valid=76, Invalid=164, Unknown=0, NotChecked=0, Total=240 [2018-09-10 10:14:26,232 INFO L87 Difference]: Start difference. First operand 39 states and 42 transitions. Second operand 9 states. [2018-09-10 10:14:26,387 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-10 10:14:26,387 INFO L93 Difference]: Finished difference Result 75 states and 81 transitions. [2018-09-10 10:14:26,387 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2018-09-10 10:14:26,388 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 30 [2018-09-10 10:14:26,388 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-10 10:14:26,392 INFO L225 Difference]: With dead ends: 75 [2018-09-10 10:14:26,392 INFO L226 Difference]: Without dead ends: 69 [2018-09-10 10:14:26,393 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 128 GetRequests, 113 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 31 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=82, Invalid=190, Unknown=0, NotChecked=0, Total=272 [2018-09-10 10:14:26,393 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2018-09-10 10:14:26,399 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 46. [2018-09-10 10:14:26,400 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2018-09-10 10:14:26,401 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 50 transitions. [2018-09-10 10:14:26,401 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 50 transitions. Word has length 30 [2018-09-10 10:14:26,401 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-10 10:14:26,402 INFO L480 AbstractCegarLoop]: Abstraction has 46 states and 50 transitions. [2018-09-10 10:14:26,402 INFO L481 AbstractCegarLoop]: Interpolant automaton has 9 states. [2018-09-10 10:14:26,402 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 50 transitions. [2018-09-10 10:14:26,403 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2018-09-10 10:14:26,403 INFO L368 BasicCegarLoop]: Found error trace [2018-09-10 10:14:26,403 INFO L376 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-09-10 10:14:26,404 INFO L423 AbstractCegarLoop]: === Iteration 6 === [__U_MULTI_f_storage_repos_ultimate_trunk_examples_svcomp_loop_invgen_string_concat_noarr_true_unreach_call_true_termination_i____VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-09-10 10:14:26,404 INFO L82 PathProgramCache]: Analyzing trace with hash 750227251, now seen corresponding path program 2 times [2018-09-10 10:14:26,404 INFO L69 tionRefinementEngine]: Using refinement strategy RubberTaipanRefinementStrategy [2018-09-10 10:14:26,405 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-10 10:14:26,405 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-10 10:14:26,406 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-10 10:14:26,406 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-09-10 10:14:26,424 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-10 10:14:26,601 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 0 proven. 27 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:14:26,602 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-10 10:14:26,602 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-09-10 10:14:26,610 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-09-10 10:14:26,611 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-09-10 10:14:26,639 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-09-10 10:14:26,639 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-10 10:14:26,642 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-10 10:14:26,652 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 0 proven. 27 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:14:26,652 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-10 10:14:26,958 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 0 proven. 27 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:14:26,979 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-10 10:14:26,979 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4nyu Starting monitored process 7 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-09-10 10:14:26,994 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-09-10 10:14:26,994 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-09-10 10:14:27,024 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-09-10 10:14:27,024 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-10 10:14:27,029 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-10 10:14:27,039 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 0 proven. 27 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:14:27,039 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-10 10:14:27,062 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 0 proven. 27 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:14:27,063 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-09-10 10:14:27,064 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10, 10, 10] total 18 [2018-09-10 10:14:27,064 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-09-10 10:14:27,064 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2018-09-10 10:14:27,065 INFO L147 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2018-09-10 10:14:27,065 INFO L148 InterpolantAutomaton]: CoverageRelationStatistics Valid=101, Invalid=205, Unknown=0, NotChecked=0, Total=306 [2018-09-10 10:14:27,065 INFO L87 Difference]: Start difference. First operand 46 states and 50 transitions. Second operand 10 states. [2018-09-10 10:14:27,367 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-10 10:14:27,367 INFO L93 Difference]: Finished difference Result 82 states and 89 transitions. [2018-09-10 10:14:27,368 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-09-10 10:14:27,368 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 33 [2018-09-10 10:14:27,369 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-10 10:14:27,370 INFO L225 Difference]: With dead ends: 82 [2018-09-10 10:14:27,370 INFO L226 Difference]: Without dead ends: 76 [2018-09-10 10:14:27,372 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 141 GetRequests, 124 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 38 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=107, Invalid=235, Unknown=0, NotChecked=0, Total=342 [2018-09-10 10:14:27,372 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2018-09-10 10:14:27,377 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 53. [2018-09-10 10:14:27,378 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53 states. [2018-09-10 10:14:27,379 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 58 transitions. [2018-09-10 10:14:27,379 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 58 transitions. Word has length 33 [2018-09-10 10:14:27,379 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-10 10:14:27,380 INFO L480 AbstractCegarLoop]: Abstraction has 53 states and 58 transitions. [2018-09-10 10:14:27,380 INFO L481 AbstractCegarLoop]: Interpolant automaton has 10 states. [2018-09-10 10:14:27,380 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 58 transitions. [2018-09-10 10:14:27,381 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2018-09-10 10:14:27,381 INFO L368 BasicCegarLoop]: Found error trace [2018-09-10 10:14:27,381 INFO L376 BasicCegarLoop]: trace histogram [5, 5, 4, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-09-10 10:14:27,382 INFO L423 AbstractCegarLoop]: === Iteration 7 === [__U_MULTI_f_storage_repos_ultimate_trunk_examples_svcomp_loop_invgen_string_concat_noarr_true_unreach_call_true_termination_i____VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-09-10 10:14:27,382 INFO L82 PathProgramCache]: Analyzing trace with hash -243819884, now seen corresponding path program 3 times [2018-09-10 10:14:27,382 INFO L69 tionRefinementEngine]: Using refinement strategy RubberTaipanRefinementStrategy [2018-09-10 10:14:27,383 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-10 10:14:27,383 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-10 10:14:27,383 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-10 10:14:27,383 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-09-10 10:14:27,395 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-10 10:14:27,601 INFO L134 CoverageAnalysis]: Checked inductivity of 39 backedges. 0 proven. 39 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:14:27,601 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-10 10:14:27,602 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-09-10 10:14:27,610 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-09-10 10:14:27,610 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-09-10 10:14:27,624 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2018-09-10 10:14:27,625 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-10 10:14:27,628 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-10 10:14:27,691 INFO L134 CoverageAnalysis]: Checked inductivity of 39 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2018-09-10 10:14:27,691 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-10 10:14:27,772 INFO L134 CoverageAnalysis]: Checked inductivity of 39 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2018-09-10 10:14:27,792 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-10 10:14:27,793 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4nyu Starting monitored process 9 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-09-10 10:14:27,808 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-09-10 10:14:27,808 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-09-10 10:14:27,839 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2018-09-10 10:14:27,839 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-10 10:14:27,844 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-10 10:14:27,851 INFO L134 CoverageAnalysis]: Checked inductivity of 39 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2018-09-10 10:14:27,851 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-10 10:14:27,899 INFO L134 CoverageAnalysis]: Checked inductivity of 39 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2018-09-10 10:14:27,904 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-09-10 10:14:27,904 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 7, 7, 7, 7] total 19 [2018-09-10 10:14:27,904 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-09-10 10:14:27,905 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2018-09-10 10:14:27,905 INFO L147 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2018-09-10 10:14:27,905 INFO L148 InterpolantAutomaton]: CoverageRelationStatistics Valid=115, Invalid=227, Unknown=0, NotChecked=0, Total=342 [2018-09-10 10:14:27,906 INFO L87 Difference]: Start difference. First operand 53 states and 58 transitions. Second operand 14 states. [2018-09-10 10:14:28,248 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-10 10:14:28,248 INFO L93 Difference]: Finished difference Result 119 states and 133 transitions. [2018-09-10 10:14:28,249 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2018-09-10 10:14:28,249 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 36 [2018-09-10 10:14:28,249 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-10 10:14:28,251 INFO L225 Difference]: With dead ends: 119 [2018-09-10 10:14:28,251 INFO L226 Difference]: Without dead ends: 107 [2018-09-10 10:14:28,253 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 154 GetRequests, 136 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 39 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=121, Invalid=259, Unknown=0, NotChecked=0, Total=380 [2018-09-10 10:14:28,253 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 107 states. [2018-09-10 10:14:28,259 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 107 to 77. [2018-09-10 10:14:28,259 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 77 states. [2018-09-10 10:14:28,261 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 85 transitions. [2018-09-10 10:14:28,261 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 85 transitions. Word has length 36 [2018-09-10 10:14:28,261 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-10 10:14:28,261 INFO L480 AbstractCegarLoop]: Abstraction has 77 states and 85 transitions. [2018-09-10 10:14:28,261 INFO L481 AbstractCegarLoop]: Interpolant automaton has 14 states. [2018-09-10 10:14:28,262 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 85 transitions. [2018-09-10 10:14:28,263 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2018-09-10 10:14:28,263 INFO L368 BasicCegarLoop]: Found error trace [2018-09-10 10:14:28,263 INFO L376 BasicCegarLoop]: trace histogram [8, 8, 7, 4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-09-10 10:14:28,264 INFO L423 AbstractCegarLoop]: === Iteration 8 === [__U_MULTI_f_storage_repos_ultimate_trunk_examples_svcomp_loop_invgen_string_concat_noarr_true_unreach_call_true_termination_i____VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-09-10 10:14:28,264 INFO L82 PathProgramCache]: Analyzing trace with hash 1071743214, now seen corresponding path program 4 times [2018-09-10 10:14:28,264 INFO L69 tionRefinementEngine]: Using refinement strategy RubberTaipanRefinementStrategy [2018-09-10 10:14:28,265 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-10 10:14:28,265 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-10 10:14:28,265 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-10 10:14:28,265 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-09-10 10:14:28,279 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-10 10:14:28,483 INFO L134 CoverageAnalysis]: Checked inductivity of 102 backedges. 0 proven. 102 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:14:28,483 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-10 10:14:28,484 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-09-10 10:14:28,494 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-09-10 10:14:28,494 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-09-10 10:14:28,518 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-09-10 10:14:28,518 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-10 10:14:28,522 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-10 10:14:28,536 INFO L134 CoverageAnalysis]: Checked inductivity of 102 backedges. 0 proven. 102 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:14:28,537 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-10 10:14:28,930 INFO L134 CoverageAnalysis]: Checked inductivity of 102 backedges. 0 proven. 102 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:14:28,951 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-10 10:14:28,951 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4nyu Starting monitored process 11 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-09-10 10:14:28,969 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-09-10 10:14:28,969 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-09-10 10:14:29,008 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-09-10 10:14:29,009 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-10 10:14:29,014 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-10 10:14:29,027 INFO L134 CoverageAnalysis]: Checked inductivity of 102 backedges. 0 proven. 102 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:14:29,028 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-10 10:14:29,051 INFO L134 CoverageAnalysis]: Checked inductivity of 102 backedges. 0 proven. 102 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:14:29,053 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-09-10 10:14:29,053 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15, 15, 15] total 28 [2018-09-10 10:14:29,053 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-09-10 10:14:29,054 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2018-09-10 10:14:29,054 INFO L147 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2018-09-10 10:14:29,055 INFO L148 InterpolantAutomaton]: CoverageRelationStatistics Valid=286, Invalid=470, Unknown=0, NotChecked=0, Total=756 [2018-09-10 10:14:29,055 INFO L87 Difference]: Start difference. First operand 77 states and 85 transitions. Second operand 15 states. [2018-09-10 10:14:29,246 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-10 10:14:29,247 INFO L93 Difference]: Finished difference Result 129 states and 141 transitions. [2018-09-10 10:14:29,247 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2018-09-10 10:14:29,247 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 48 [2018-09-10 10:14:29,247 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-10 10:14:29,248 INFO L225 Difference]: With dead ends: 129 [2018-09-10 10:14:29,249 INFO L226 Difference]: Without dead ends: 123 [2018-09-10 10:14:29,250 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 206 GetRequests, 179 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 73 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=292, Invalid=520, Unknown=0, NotChecked=0, Total=812 [2018-09-10 10:14:29,251 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 123 states. [2018-09-10 10:14:29,256 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 123 to 84. [2018-09-10 10:14:29,257 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 84 states. [2018-09-10 10:14:29,258 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 84 states to 84 states and 93 transitions. [2018-09-10 10:14:29,258 INFO L78 Accepts]: Start accepts. Automaton has 84 states and 93 transitions. Word has length 48 [2018-09-10 10:14:29,259 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-10 10:14:29,259 INFO L480 AbstractCegarLoop]: Abstraction has 84 states and 93 transitions. [2018-09-10 10:14:29,259 INFO L481 AbstractCegarLoop]: Interpolant automaton has 15 states. [2018-09-10 10:14:29,259 INFO L276 IsEmpty]: Start isEmpty. Operand 84 states and 93 transitions. [2018-09-10 10:14:29,260 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2018-09-10 10:14:29,260 INFO L368 BasicCegarLoop]: Found error trace [2018-09-10 10:14:29,261 INFO L376 BasicCegarLoop]: trace histogram [9, 9, 8, 4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-09-10 10:14:29,261 INFO L423 AbstractCegarLoop]: === Iteration 9 === [__U_MULTI_f_storage_repos_ultimate_trunk_examples_svcomp_loop_invgen_string_concat_noarr_true_unreach_call_true_termination_i____VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-09-10 10:14:29,261 INFO L82 PathProgramCache]: Analyzing trace with hash 535766893, now seen corresponding path program 5 times [2018-09-10 10:14:29,261 INFO L69 tionRefinementEngine]: Using refinement strategy RubberTaipanRefinementStrategy [2018-09-10 10:14:29,262 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-10 10:14:29,262 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-10 10:14:29,262 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-10 10:14:29,263 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-09-10 10:14:29,274 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-10 10:14:29,559 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:14:29,559 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-10 10:14:29,560 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-09-10 10:14:29,568 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-09-10 10:14:29,568 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-09-10 10:14:29,675 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 9 check-sat command(s) [2018-09-10 10:14:29,675 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-10 10:14:29,678 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-10 10:14:29,694 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:14:29,694 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-10 10:14:30,482 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:14:30,502 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-10 10:14:30,502 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4nyu Starting monitored process 13 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-09-10 10:14:30,520 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-09-10 10:14:30,520 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-09-10 10:14:30,585 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 9 check-sat command(s) [2018-09-10 10:14:30,586 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-10 10:14:30,590 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-10 10:14:30,604 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:14:30,604 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-10 10:14:30,635 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:14:30,636 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-09-10 10:14:30,637 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16, 16, 16, 16] total 30 [2018-09-10 10:14:30,637 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-09-10 10:14:30,637 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2018-09-10 10:14:30,638 INFO L147 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2018-09-10 10:14:30,638 INFO L148 InterpolantAutomaton]: CoverageRelationStatistics Valid=335, Invalid=535, Unknown=0, NotChecked=0, Total=870 [2018-09-10 10:14:30,639 INFO L87 Difference]: Start difference. First operand 84 states and 93 transitions. Second operand 16 states. [2018-09-10 10:14:30,947 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-10 10:14:30,948 INFO L93 Difference]: Finished difference Result 136 states and 149 transitions. [2018-09-10 10:14:30,948 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2018-09-10 10:14:30,948 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 51 [2018-09-10 10:14:30,949 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-10 10:14:30,949 INFO L225 Difference]: With dead ends: 136 [2018-09-10 10:14:30,950 INFO L226 Difference]: Without dead ends: 130 [2018-09-10 10:14:30,950 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 219 GetRequests, 190 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 80 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=341, Invalid=589, Unknown=0, NotChecked=0, Total=930 [2018-09-10 10:14:30,951 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 130 states. [2018-09-10 10:14:30,957 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 130 to 91. [2018-09-10 10:14:30,957 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 91 states. [2018-09-10 10:14:30,959 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 91 states to 91 states and 101 transitions. [2018-09-10 10:14:30,959 INFO L78 Accepts]: Start accepts. Automaton has 91 states and 101 transitions. Word has length 51 [2018-09-10 10:14:30,959 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-10 10:14:30,960 INFO L480 AbstractCegarLoop]: Abstraction has 91 states and 101 transitions. [2018-09-10 10:14:30,960 INFO L481 AbstractCegarLoop]: Interpolant automaton has 16 states. [2018-09-10 10:14:30,960 INFO L276 IsEmpty]: Start isEmpty. Operand 91 states and 101 transitions. [2018-09-10 10:14:30,961 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2018-09-10 10:14:30,961 INFO L368 BasicCegarLoop]: Found error trace [2018-09-10 10:14:30,961 INFO L376 BasicCegarLoop]: trace histogram [10, 10, 9, 4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-09-10 10:14:30,962 INFO L423 AbstractCegarLoop]: === Iteration 10 === [__U_MULTI_f_storage_repos_ultimate_trunk_examples_svcomp_loop_invgen_string_concat_noarr_true_unreach_call_true_termination_i____VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-09-10 10:14:30,962 INFO L82 PathProgramCache]: Analyzing trace with hash 1953594510, now seen corresponding path program 6 times [2018-09-10 10:14:30,962 INFO L69 tionRefinementEngine]: Using refinement strategy RubberTaipanRefinementStrategy [2018-09-10 10:14:30,963 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-10 10:14:30,963 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-10 10:14:30,963 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-10 10:14:30,963 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-09-10 10:14:30,974 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-10 10:14:31,167 INFO L134 CoverageAnalysis]: Checked inductivity of 153 backedges. 0 proven. 153 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:14:31,167 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-10 10:14:31,167 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-09-10 10:14:31,199 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-09-10 10:14:31,200 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-09-10 10:14:31,227 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2018-09-10 10:14:31,227 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-10 10:14:31,230 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-10 10:14:31,330 INFO L134 CoverageAnalysis]: Checked inductivity of 153 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 135 trivial. 0 not checked. [2018-09-10 10:14:31,331 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-10 10:14:31,470 INFO L134 CoverageAnalysis]: Checked inductivity of 153 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 135 trivial. 0 not checked. [2018-09-10 10:14:31,491 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-10 10:14:31,491 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4nyu Starting monitored process 15 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-09-10 10:14:31,507 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-09-10 10:14:31,507 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-09-10 10:14:31,563 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2018-09-10 10:14:31,563 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-10 10:14:31,567 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-10 10:14:31,573 INFO L134 CoverageAnalysis]: Checked inductivity of 153 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 135 trivial. 0 not checked. [2018-09-10 10:14:31,574 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-10 10:14:31,619 INFO L134 CoverageAnalysis]: Checked inductivity of 153 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 135 trivial. 0 not checked. [2018-09-10 10:14:31,622 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-09-10 10:14:31,622 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 8, 8, 8, 8] total 27 [2018-09-10 10:14:31,622 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-09-10 10:14:31,623 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2018-09-10 10:14:31,623 INFO L147 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2018-09-10 10:14:31,624 INFO L148 InterpolantAutomaton]: CoverageRelationStatistics Valid=263, Invalid=439, Unknown=0, NotChecked=0, Total=702 [2018-09-10 10:14:31,624 INFO L87 Difference]: Start difference. First operand 91 states and 101 transitions. Second operand 21 states. [2018-09-10 10:14:32,074 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-10 10:14:32,075 INFO L93 Difference]: Finished difference Result 188 states and 210 transitions. [2018-09-10 10:14:32,075 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2018-09-10 10:14:32,075 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 54 [2018-09-10 10:14:32,076 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-10 10:14:32,078 INFO L225 Difference]: With dead ends: 188 [2018-09-10 10:14:32,078 INFO L226 Difference]: Without dead ends: 174 [2018-09-10 10:14:32,079 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 232 GetRequests, 206 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 68 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=269, Invalid=487, Unknown=0, NotChecked=0, Total=756 [2018-09-10 10:14:32,080 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 174 states. [2018-09-10 10:14:32,086 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 174 to 122. [2018-09-10 10:14:32,086 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 122 states. [2018-09-10 10:14:32,088 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 122 states to 122 states and 136 transitions. [2018-09-10 10:14:32,088 INFO L78 Accepts]: Start accepts. Automaton has 122 states and 136 transitions. Word has length 54 [2018-09-10 10:14:32,088 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-10 10:14:32,088 INFO L480 AbstractCegarLoop]: Abstraction has 122 states and 136 transitions. [2018-09-10 10:14:32,088 INFO L481 AbstractCegarLoop]: Interpolant automaton has 21 states. [2018-09-10 10:14:32,088 INFO L276 IsEmpty]: Start isEmpty. Operand 122 states and 136 transitions. [2018-09-10 10:14:32,090 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2018-09-10 10:14:32,090 INFO L368 BasicCegarLoop]: Found error trace [2018-09-10 10:14:32,090 INFO L376 BasicCegarLoop]: trace histogram [14, 14, 13, 5, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-09-10 10:14:32,090 INFO L423 AbstractCegarLoop]: === Iteration 11 === [__U_MULTI_f_storage_repos_ultimate_trunk_examples_svcomp_loop_invgen_string_concat_noarr_true_unreach_call_true_termination_i____VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-09-10 10:14:32,091 INFO L82 PathProgramCache]: Analyzing trace with hash 1732418355, now seen corresponding path program 7 times [2018-09-10 10:14:32,091 INFO L69 tionRefinementEngine]: Using refinement strategy RubberTaipanRefinementStrategy [2018-09-10 10:14:32,092 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-10 10:14:32,092 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-10 10:14:32,092 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-10 10:14:32,092 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-09-10 10:14:32,107 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-10 10:14:32,434 INFO L134 CoverageAnalysis]: Checked inductivity of 303 backedges. 0 proven. 303 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:14:32,435 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-10 10:14:32,435 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-09-10 10:14:32,444 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-10 10:14:32,444 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-09-10 10:14:32,477 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-10 10:14:32,480 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-10 10:14:32,498 INFO L134 CoverageAnalysis]: Checked inductivity of 303 backedges. 0 proven. 303 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:14:32,498 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-10 10:14:33,346 INFO L134 CoverageAnalysis]: Checked inductivity of 303 backedges. 0 proven. 303 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:14:33,367 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-10 10:14:33,368 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4nyu Starting monitored process 17 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-09-10 10:14:33,382 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-10 10:14:33,383 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-09-10 10:14:33,425 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-10 10:14:33,429 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-10 10:14:33,443 INFO L134 CoverageAnalysis]: Checked inductivity of 303 backedges. 0 proven. 303 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:14:33,443 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-10 10:14:33,518 INFO L134 CoverageAnalysis]: Checked inductivity of 303 backedges. 0 proven. 303 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:14:33,521 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-09-10 10:14:33,521 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22, 22, 22, 22] total 42 [2018-09-10 10:14:33,521 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-09-10 10:14:33,522 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2018-09-10 10:14:33,522 INFO L147 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2018-09-10 10:14:33,523 INFO L148 InterpolantAutomaton]: CoverageRelationStatistics Valid=713, Invalid=1009, Unknown=0, NotChecked=0, Total=1722 [2018-09-10 10:14:33,523 INFO L87 Difference]: Start difference. First operand 122 states and 136 transitions. Second operand 22 states. [2018-09-10 10:14:33,807 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-10 10:14:33,807 INFO L93 Difference]: Finished difference Result 193 states and 212 transitions. [2018-09-10 10:14:33,807 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2018-09-10 10:14:33,807 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 69 [2018-09-10 10:14:33,808 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-10 10:14:33,810 INFO L225 Difference]: With dead ends: 193 [2018-09-10 10:14:33,810 INFO L226 Difference]: Without dead ends: 187 [2018-09-10 10:14:33,811 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 297 GetRequests, 256 SyntacticMatches, 0 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 122 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=719, Invalid=1087, Unknown=0, NotChecked=0, Total=1806 [2018-09-10 10:14:33,812 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 187 states. [2018-09-10 10:14:33,817 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 187 to 129. [2018-09-10 10:14:33,818 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 129 states. [2018-09-10 10:14:33,819 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 129 states to 129 states and 144 transitions. [2018-09-10 10:14:33,819 INFO L78 Accepts]: Start accepts. Automaton has 129 states and 144 transitions. Word has length 69 [2018-09-10 10:14:33,819 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-10 10:14:33,819 INFO L480 AbstractCegarLoop]: Abstraction has 129 states and 144 transitions. [2018-09-10 10:14:33,820 INFO L481 AbstractCegarLoop]: Interpolant automaton has 22 states. [2018-09-10 10:14:33,820 INFO L276 IsEmpty]: Start isEmpty. Operand 129 states and 144 transitions. [2018-09-10 10:14:33,821 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 73 [2018-09-10 10:14:33,821 INFO L368 BasicCegarLoop]: Found error trace [2018-09-10 10:14:33,821 INFO L376 BasicCegarLoop]: trace histogram [15, 15, 14, 5, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-09-10 10:14:33,822 INFO L423 AbstractCegarLoop]: === Iteration 12 === [__U_MULTI_f_storage_repos_ultimate_trunk_examples_svcomp_loop_invgen_string_concat_noarr_true_unreach_call_true_termination_i____VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-09-10 10:14:33,822 INFO L82 PathProgramCache]: Analyzing trace with hash 1957710356, now seen corresponding path program 8 times [2018-09-10 10:14:33,822 INFO L69 tionRefinementEngine]: Using refinement strategy RubberTaipanRefinementStrategy [2018-09-10 10:14:33,823 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-10 10:14:33,823 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-10 10:14:33,823 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-10 10:14:33,823 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-09-10 10:14:33,836 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-10 10:14:34,987 INFO L134 CoverageAnalysis]: Checked inductivity of 345 backedges. 0 proven. 345 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:14:34,987 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-10 10:14:34,987 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-09-10 10:14:34,994 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-09-10 10:14:34,995 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-09-10 10:14:35,015 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-09-10 10:14:35,015 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-10 10:14:35,017 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-10 10:14:35,030 INFO L134 CoverageAnalysis]: Checked inductivity of 345 backedges. 0 proven. 345 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:14:35,031 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-10 10:14:36,226 INFO L134 CoverageAnalysis]: Checked inductivity of 345 backedges. 0 proven. 345 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:14:36,246 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-10 10:14:36,247 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4nyu Starting monitored process 19 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-09-10 10:14:36,262 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-09-10 10:14:36,262 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-09-10 10:14:36,317 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-09-10 10:14:36,318 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-10 10:14:36,323 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-10 10:14:36,334 INFO L134 CoverageAnalysis]: Checked inductivity of 345 backedges. 0 proven. 345 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:14:36,334 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-10 10:14:36,362 INFO L134 CoverageAnalysis]: Checked inductivity of 345 backedges. 0 proven. 345 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:14:36,363 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-09-10 10:14:36,364 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23, 23, 23, 23] total 44 [2018-09-10 10:14:36,364 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-09-10 10:14:36,364 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2018-09-10 10:14:36,365 INFO L147 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2018-09-10 10:14:36,365 INFO L148 InterpolantAutomaton]: CoverageRelationStatistics Valid=790, Invalid=1102, Unknown=0, NotChecked=0, Total=1892 [2018-09-10 10:14:36,366 INFO L87 Difference]: Start difference. First operand 129 states and 144 transitions. Second operand 23 states. [2018-09-10 10:14:36,620 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-10 10:14:36,620 INFO L93 Difference]: Finished difference Result 200 states and 220 transitions. [2018-09-10 10:14:36,620 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2018-09-10 10:14:36,620 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 72 [2018-09-10 10:14:36,621 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-10 10:14:36,622 INFO L225 Difference]: With dead ends: 200 [2018-09-10 10:14:36,623 INFO L226 Difference]: Without dead ends: 194 [2018-09-10 10:14:36,624 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 310 GetRequests, 267 SyntacticMatches, 0 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 129 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=796, Invalid=1184, Unknown=0, NotChecked=0, Total=1980 [2018-09-10 10:14:36,624 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 194 states. [2018-09-10 10:14:36,628 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 194 to 136. [2018-09-10 10:14:36,629 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 136 states. [2018-09-10 10:14:36,630 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 136 states to 136 states and 152 transitions. [2018-09-10 10:14:36,630 INFO L78 Accepts]: Start accepts. Automaton has 136 states and 152 transitions. Word has length 72 [2018-09-10 10:14:36,630 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-10 10:14:36,630 INFO L480 AbstractCegarLoop]: Abstraction has 136 states and 152 transitions. [2018-09-10 10:14:36,631 INFO L481 AbstractCegarLoop]: Interpolant automaton has 23 states. [2018-09-10 10:14:36,631 INFO L276 IsEmpty]: Start isEmpty. Operand 136 states and 152 transitions. [2018-09-10 10:14:36,632 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2018-09-10 10:14:36,632 INFO L368 BasicCegarLoop]: Found error trace [2018-09-10 10:14:36,632 INFO L376 BasicCegarLoop]: trace histogram [16, 16, 15, 5, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-09-10 10:14:36,633 INFO L423 AbstractCegarLoop]: === Iteration 13 === [__U_MULTI_f_storage_repos_ultimate_trunk_examples_svcomp_loop_invgen_string_concat_noarr_true_unreach_call_true_termination_i____VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-09-10 10:14:36,633 INFO L82 PathProgramCache]: Analyzing trace with hash 597828499, now seen corresponding path program 9 times [2018-09-10 10:14:36,633 INFO L69 tionRefinementEngine]: Using refinement strategy RubberTaipanRefinementStrategy [2018-09-10 10:14:36,634 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-10 10:14:36,634 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-10 10:14:36,634 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-10 10:14:36,634 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-09-10 10:14:36,646 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-10 10:14:36,992 INFO L134 CoverageAnalysis]: Checked inductivity of 390 backedges. 0 proven. 390 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:14:36,993 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-10 10:14:36,993 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-09-10 10:14:37,001 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-09-10 10:14:37,001 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-09-10 10:14:37,020 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2018-09-10 10:14:37,020 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-10 10:14:37,023 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-10 10:14:37,404 INFO L134 CoverageAnalysis]: Checked inductivity of 390 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 360 trivial. 0 not checked. [2018-09-10 10:14:37,404 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-10 10:14:37,953 INFO L134 CoverageAnalysis]: Checked inductivity of 390 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 360 trivial. 0 not checked. [2018-09-10 10:14:37,973 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-10 10:14:37,974 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4nyu Starting monitored process 21 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-09-10 10:14:37,990 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-09-10 10:14:37,990 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-09-10 10:14:38,042 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2018-09-10 10:14:38,042 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-10 10:14:38,045 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-10 10:14:38,056 INFO L134 CoverageAnalysis]: Checked inductivity of 390 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 360 trivial. 0 not checked. [2018-09-10 10:14:38,057 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-10 10:14:38,103 INFO L134 CoverageAnalysis]: Checked inductivity of 390 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 360 trivial. 0 not checked. [2018-09-10 10:14:38,104 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-09-10 10:14:38,105 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 9, 9, 9, 9] total 36 [2018-09-10 10:14:38,105 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-09-10 10:14:38,105 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2018-09-10 10:14:38,106 INFO L147 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2018-09-10 10:14:38,106 INFO L148 InterpolantAutomaton]: CoverageRelationStatistics Valid=506, Invalid=754, Unknown=0, NotChecked=0, Total=1260 [2018-09-10 10:14:38,106 INFO L87 Difference]: Start difference. First operand 136 states and 152 transitions. Second operand 29 states. [2018-09-10 10:14:38,570 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-10 10:14:38,570 INFO L93 Difference]: Finished difference Result 270 states and 301 transitions. [2018-09-10 10:14:38,570 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2018-09-10 10:14:38,570 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 75 [2018-09-10 10:14:38,571 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-10 10:14:38,573 INFO L225 Difference]: With dead ends: 270 [2018-09-10 10:14:38,573 INFO L226 Difference]: Without dead ends: 254 [2018-09-10 10:14:38,574 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 323 GetRequests, 288 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 101 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=512, Invalid=820, Unknown=0, NotChecked=0, Total=1332 [2018-09-10 10:14:38,575 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 254 states. [2018-09-10 10:14:38,579 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 254 to 174. [2018-09-10 10:14:38,579 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 174 states. [2018-09-10 10:14:38,580 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 174 states to 174 states and 195 transitions. [2018-09-10 10:14:38,581 INFO L78 Accepts]: Start accepts. Automaton has 174 states and 195 transitions. Word has length 75 [2018-09-10 10:14:38,581 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-10 10:14:38,581 INFO L480 AbstractCegarLoop]: Abstraction has 174 states and 195 transitions. [2018-09-10 10:14:38,581 INFO L481 AbstractCegarLoop]: Interpolant automaton has 29 states. [2018-09-10 10:14:38,581 INFO L276 IsEmpty]: Start isEmpty. Operand 174 states and 195 transitions. [2018-09-10 10:14:38,583 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 94 [2018-09-10 10:14:38,583 INFO L368 BasicCegarLoop]: Found error trace [2018-09-10 10:14:38,583 INFO L376 BasicCegarLoop]: trace histogram [21, 21, 20, 6, 6, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-09-10 10:14:38,583 INFO L423 AbstractCegarLoop]: === Iteration 14 === [__U_MULTI_f_storage_repos_ultimate_trunk_examples_svcomp_loop_invgen_string_concat_noarr_true_unreach_call_true_termination_i____VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-09-10 10:14:38,584 INFO L82 PathProgramCache]: Analyzing trace with hash 1143150669, now seen corresponding path program 10 times [2018-09-10 10:14:38,584 INFO L69 tionRefinementEngine]: Using refinement strategy RubberTaipanRefinementStrategy [2018-09-10 10:14:38,585 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-10 10:14:38,585 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-10 10:14:38,585 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-10 10:14:38,585 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-09-10 10:14:38,604 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-10 10:14:40,030 INFO L134 CoverageAnalysis]: Checked inductivity of 675 backedges. 0 proven. 675 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:14:40,030 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-10 10:14:40,031 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-09-10 10:14:40,039 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-09-10 10:14:40,039 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-09-10 10:14:40,090 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-09-10 10:14:40,091 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-10 10:14:40,094 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-10 10:14:40,113 INFO L134 CoverageAnalysis]: Checked inductivity of 675 backedges. 0 proven. 675 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:14:40,113 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-10 10:14:41,028 INFO L134 CoverageAnalysis]: Checked inductivity of 675 backedges. 0 proven. 675 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:14:41,048 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-10 10:14:41,048 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4nyu Starting monitored process 23 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-09-10 10:14:41,063 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-09-10 10:14:41,064 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-09-10 10:14:41,126 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-09-10 10:14:41,126 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-10 10:14:41,132 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-10 10:14:41,147 INFO L134 CoverageAnalysis]: Checked inductivity of 675 backedges. 0 proven. 675 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:14:41,148 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-10 10:14:41,200 INFO L134 CoverageAnalysis]: Checked inductivity of 675 backedges. 0 proven. 675 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:14:41,202 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-09-10 10:14:41,202 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 30, 30, 30, 30] total 58 [2018-09-10 10:14:41,202 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-09-10 10:14:41,202 INFO L459 AbstractCegarLoop]: Interpolant automaton has 30 states [2018-09-10 10:14:41,203 INFO L147 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2018-09-10 10:14:41,204 INFO L148 InterpolantAutomaton]: CoverageRelationStatistics Valid=1441, Invalid=1865, Unknown=0, NotChecked=0, Total=3306 [2018-09-10 10:14:41,204 INFO L87 Difference]: Start difference. First operand 174 states and 195 transitions. Second operand 30 states. [2018-09-10 10:14:41,526 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-10 10:14:41,526 INFO L93 Difference]: Finished difference Result 267 states and 294 transitions. [2018-09-10 10:14:41,526 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2018-09-10 10:14:41,526 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 93 [2018-09-10 10:14:41,526 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-10 10:14:41,528 INFO L225 Difference]: With dead ends: 267 [2018-09-10 10:14:41,528 INFO L226 Difference]: Without dead ends: 261 [2018-09-10 10:14:41,530 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 401 GetRequests, 344 SyntacticMatches, 0 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 178 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=1447, Invalid=1975, Unknown=0, NotChecked=0, Total=3422 [2018-09-10 10:14:41,530 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 261 states. [2018-09-10 10:14:41,534 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 261 to 181. [2018-09-10 10:14:41,534 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 181 states. [2018-09-10 10:14:41,535 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 181 states to 181 states and 203 transitions. [2018-09-10 10:14:41,536 INFO L78 Accepts]: Start accepts. Automaton has 181 states and 203 transitions. Word has length 93 [2018-09-10 10:14:41,536 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-10 10:14:41,536 INFO L480 AbstractCegarLoop]: Abstraction has 181 states and 203 transitions. [2018-09-10 10:14:41,536 INFO L481 AbstractCegarLoop]: Interpolant automaton has 30 states. [2018-09-10 10:14:41,536 INFO L276 IsEmpty]: Start isEmpty. Operand 181 states and 203 transitions. [2018-09-10 10:14:41,538 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2018-09-10 10:14:41,538 INFO L368 BasicCegarLoop]: Found error trace [2018-09-10 10:14:41,538 INFO L376 BasicCegarLoop]: trace histogram [22, 22, 21, 6, 6, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-09-10 10:14:41,538 INFO L423 AbstractCegarLoop]: === Iteration 15 === [__U_MULTI_f_storage_repos_ultimate_trunk_examples_svcomp_loop_invgen_string_concat_noarr_true_unreach_call_true_termination_i____VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-09-10 10:14:41,538 INFO L82 PathProgramCache]: Analyzing trace with hash 492467246, now seen corresponding path program 11 times [2018-09-10 10:14:41,539 INFO L69 tionRefinementEngine]: Using refinement strategy RubberTaipanRefinementStrategy [2018-09-10 10:14:41,539 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-10 10:14:41,539 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-10 10:14:41,540 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-10 10:14:41,540 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-09-10 10:14:41,553 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-10 10:14:41,987 INFO L134 CoverageAnalysis]: Checked inductivity of 738 backedges. 0 proven. 738 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:14:41,987 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-10 10:14:41,987 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-09-10 10:14:41,995 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-09-10 10:14:41,995 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-09-10 10:14:42,039 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 22 check-sat command(s) [2018-09-10 10:14:42,039 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-10 10:14:42,042 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-10 10:14:42,059 INFO L134 CoverageAnalysis]: Checked inductivity of 738 backedges. 0 proven. 738 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:14:42,060 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-10 10:14:42,987 INFO L134 CoverageAnalysis]: Checked inductivity of 738 backedges. 0 proven. 738 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:14:43,007 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-10 10:14:43,008 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4nyu Starting monitored process 25 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-09-10 10:14:43,026 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-09-10 10:14:43,026 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-09-10 10:14:43,221 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 22 check-sat command(s) [2018-09-10 10:14:43,221 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-10 10:14:43,226 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-10 10:14:43,251 INFO L134 CoverageAnalysis]: Checked inductivity of 738 backedges. 0 proven. 738 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:14:43,252 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-10 10:14:43,287 INFO L134 CoverageAnalysis]: Checked inductivity of 738 backedges. 0 proven. 738 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:14:43,288 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-09-10 10:14:43,289 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 31, 31, 31, 31] total 60 [2018-09-10 10:14:43,289 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-09-10 10:14:43,289 INFO L459 AbstractCegarLoop]: Interpolant automaton has 31 states [2018-09-10 10:14:43,289 INFO L147 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2018-09-10 10:14:43,290 INFO L148 InterpolantAutomaton]: CoverageRelationStatistics Valid=1550, Invalid=1990, Unknown=0, NotChecked=0, Total=3540 [2018-09-10 10:14:43,291 INFO L87 Difference]: Start difference. First operand 181 states and 203 transitions. Second operand 31 states. [2018-09-10 10:14:43,723 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-10 10:14:43,723 INFO L93 Difference]: Finished difference Result 274 states and 302 transitions. [2018-09-10 10:14:43,724 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2018-09-10 10:14:43,724 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 96 [2018-09-10 10:14:43,724 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-10 10:14:43,727 INFO L225 Difference]: With dead ends: 274 [2018-09-10 10:14:43,727 INFO L226 Difference]: Without dead ends: 268 [2018-09-10 10:14:43,729 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 414 GetRequests, 355 SyntacticMatches, 0 SemanticMatches, 59 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 185 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=1556, Invalid=2104, Unknown=0, NotChecked=0, Total=3660 [2018-09-10 10:14:43,729 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 268 states. [2018-09-10 10:14:43,734 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 268 to 188. [2018-09-10 10:14:43,734 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 188 states. [2018-09-10 10:14:43,735 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 188 states to 188 states and 211 transitions. [2018-09-10 10:14:43,735 INFO L78 Accepts]: Start accepts. Automaton has 188 states and 211 transitions. Word has length 96 [2018-09-10 10:14:43,735 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-10 10:14:43,736 INFO L480 AbstractCegarLoop]: Abstraction has 188 states and 211 transitions. [2018-09-10 10:14:43,736 INFO L481 AbstractCegarLoop]: Interpolant automaton has 31 states. [2018-09-10 10:14:43,736 INFO L276 IsEmpty]: Start isEmpty. Operand 188 states and 211 transitions. [2018-09-10 10:14:43,737 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 100 [2018-09-10 10:14:43,737 INFO L368 BasicCegarLoop]: Found error trace [2018-09-10 10:14:43,737 INFO L376 BasicCegarLoop]: trace histogram [23, 23, 22, 6, 6, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-09-10 10:14:43,738 INFO L423 AbstractCegarLoop]: === Iteration 16 === [__U_MULTI_f_storage_repos_ultimate_trunk_examples_svcomp_loop_invgen_string_concat_noarr_true_unreach_call_true_termination_i____VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-09-10 10:14:43,738 INFO L82 PathProgramCache]: Analyzing trace with hash -829980499, now seen corresponding path program 12 times [2018-09-10 10:14:43,738 INFO L69 tionRefinementEngine]: Using refinement strategy RubberTaipanRefinementStrategy [2018-09-10 10:14:43,739 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-10 10:14:43,739 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-10 10:14:43,739 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-10 10:14:43,739 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-09-10 10:14:43,753 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-10 10:14:44,221 INFO L134 CoverageAnalysis]: Checked inductivity of 804 backedges. 0 proven. 804 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:14:44,221 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-10 10:14:44,222 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-09-10 10:14:44,228 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-09-10 10:14:44,228 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-09-10 10:14:44,256 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 11 check-sat command(s) [2018-09-10 10:14:44,256 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-10 10:14:44,259 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-10 10:14:44,437 INFO L134 CoverageAnalysis]: Checked inductivity of 804 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 759 trivial. 0 not checked. [2018-09-10 10:14:44,437 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-10 10:14:44,646 INFO L134 CoverageAnalysis]: Checked inductivity of 804 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 759 trivial. 0 not checked. [2018-09-10 10:14:44,666 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-10 10:14:44,667 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4nyu Starting monitored process 27 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 27 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-09-10 10:14:44,682 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-09-10 10:14:44,682 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-09-10 10:14:44,782 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 11 check-sat command(s) [2018-09-10 10:14:44,782 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-10 10:14:44,786 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-10 10:14:44,796 INFO L134 CoverageAnalysis]: Checked inductivity of 804 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 759 trivial. 0 not checked. [2018-09-10 10:14:44,796 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-10 10:14:44,860 INFO L134 CoverageAnalysis]: Checked inductivity of 804 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 759 trivial. 0 not checked. [2018-09-10 10:14:44,861 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-09-10 10:14:44,861 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 10, 10, 10, 10] total 46 [2018-09-10 10:14:44,861 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-09-10 10:14:44,862 INFO L459 AbstractCegarLoop]: Interpolant automaton has 38 states [2018-09-10 10:14:44,862 INFO L147 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2018-09-10 10:14:44,863 INFO L148 InterpolantAutomaton]: CoverageRelationStatistics Valid=871, Invalid=1199, Unknown=0, NotChecked=0, Total=2070 [2018-09-10 10:14:44,863 INFO L87 Difference]: Start difference. First operand 188 states and 211 transitions. Second operand 38 states. [2018-09-10 10:14:45,365 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-10 10:14:45,366 INFO L93 Difference]: Finished difference Result 365 states and 406 transitions. [2018-09-10 10:14:45,372 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2018-09-10 10:14:45,372 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 99 [2018-09-10 10:14:45,372 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-10 10:14:45,373 INFO L225 Difference]: With dead ends: 365 [2018-09-10 10:14:45,374 INFO L226 Difference]: Without dead ends: 347 [2018-09-10 10:14:45,375 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 427 GetRequests, 382 SyntacticMatches, 0 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 138 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=877, Invalid=1285, Unknown=0, NotChecked=0, Total=2162 [2018-09-10 10:14:45,375 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 347 states. [2018-09-10 10:14:45,379 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 347 to 233. [2018-09-10 10:14:45,379 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 233 states. [2018-09-10 10:14:45,380 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 233 states to 233 states and 262 transitions. [2018-09-10 10:14:45,381 INFO L78 Accepts]: Start accepts. Automaton has 233 states and 262 transitions. Word has length 99 [2018-09-10 10:14:45,381 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-10 10:14:45,381 INFO L480 AbstractCegarLoop]: Abstraction has 233 states and 262 transitions. [2018-09-10 10:14:45,381 INFO L481 AbstractCegarLoop]: Interpolant automaton has 38 states. [2018-09-10 10:14:45,381 INFO L276 IsEmpty]: Start isEmpty. Operand 233 states and 262 transitions. [2018-09-10 10:14:45,382 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 121 [2018-09-10 10:14:45,382 INFO L368 BasicCegarLoop]: Found error trace [2018-09-10 10:14:45,383 INFO L376 BasicCegarLoop]: trace histogram [29, 29, 28, 7, 7, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-09-10 10:14:45,383 INFO L423 AbstractCegarLoop]: === Iteration 17 === [__U_MULTI_f_storage_repos_ultimate_trunk_examples_svcomp_loop_invgen_string_concat_noarr_true_unreach_call_true_termination_i____VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-09-10 10:14:45,383 INFO L82 PathProgramCache]: Analyzing trace with hash -612030252, now seen corresponding path program 13 times [2018-09-10 10:14:45,383 INFO L69 tionRefinementEngine]: Using refinement strategy RubberTaipanRefinementStrategy [2018-09-10 10:14:45,384 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-10 10:14:45,384 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-10 10:14:45,384 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-10 10:14:45,384 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-09-10 10:14:45,404 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-10 10:14:46,004 INFO L134 CoverageAnalysis]: Checked inductivity of 1281 backedges. 0 proven. 1281 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:14:46,005 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-10 10:14:46,005 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-09-10 10:14:46,014 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-10 10:14:46,014 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-09-10 10:14:46,054 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-10 10:14:46,056 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-10 10:14:46,081 INFO L134 CoverageAnalysis]: Checked inductivity of 1281 backedges. 0 proven. 1281 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:14:46,081 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-10 10:14:48,277 INFO L134 CoverageAnalysis]: Checked inductivity of 1281 backedges. 0 proven. 1281 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:14:48,298 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-10 10:14:48,299 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4nyu Starting monitored process 29 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 29 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-09-10 10:14:48,314 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-10 10:14:48,314 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-09-10 10:14:48,397 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-10 10:14:48,402 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-10 10:14:48,426 INFO L134 CoverageAnalysis]: Checked inductivity of 1281 backedges. 0 proven. 1281 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:14:48,426 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-10 10:14:48,516 INFO L134 CoverageAnalysis]: Checked inductivity of 1281 backedges. 0 proven. 1281 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:14:48,518 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-09-10 10:14:48,518 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [39, 39, 39, 39, 39] total 76 [2018-09-10 10:14:48,518 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-09-10 10:14:48,519 INFO L459 AbstractCegarLoop]: Interpolant automaton has 39 states [2018-09-10 10:14:48,519 INFO L147 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2018-09-10 10:14:48,521 INFO L148 InterpolantAutomaton]: CoverageRelationStatistics Valid=2566, Invalid=3134, Unknown=0, NotChecked=0, Total=5700 [2018-09-10 10:14:48,521 INFO L87 Difference]: Start difference. First operand 233 states and 262 transitions. Second operand 39 states. [2018-09-10 10:14:48,978 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-10 10:14:48,979 INFO L93 Difference]: Finished difference Result 351 states and 387 transitions. [2018-09-10 10:14:48,979 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2018-09-10 10:14:48,979 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 120 [2018-09-10 10:14:48,979 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-10 10:14:48,981 INFO L225 Difference]: With dead ends: 351 [2018-09-10 10:14:48,981 INFO L226 Difference]: Without dead ends: 345 [2018-09-10 10:14:48,982 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 518 GetRequests, 443 SyntacticMatches, 0 SemanticMatches, 75 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 241 ImplicationChecksByTransitivity, 2.7s TimeCoverageRelationStatistics Valid=2572, Invalid=3280, Unknown=0, NotChecked=0, Total=5852 [2018-09-10 10:14:48,983 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 345 states. [2018-09-10 10:14:48,987 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 345 to 240. [2018-09-10 10:14:48,987 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 240 states. [2018-09-10 10:14:48,988 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 240 states to 240 states and 270 transitions. [2018-09-10 10:14:48,988 INFO L78 Accepts]: Start accepts. Automaton has 240 states and 270 transitions. Word has length 120 [2018-09-10 10:14:48,989 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-10 10:14:48,989 INFO L480 AbstractCegarLoop]: Abstraction has 240 states and 270 transitions. [2018-09-10 10:14:48,989 INFO L481 AbstractCegarLoop]: Interpolant automaton has 39 states. [2018-09-10 10:14:48,989 INFO L276 IsEmpty]: Start isEmpty. Operand 240 states and 270 transitions. [2018-09-10 10:14:48,990 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 124 [2018-09-10 10:14:48,990 INFO L368 BasicCegarLoop]: Found error trace [2018-09-10 10:14:48,990 INFO L376 BasicCegarLoop]: trace histogram [30, 30, 29, 7, 7, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-09-10 10:14:48,990 INFO L423 AbstractCegarLoop]: === Iteration 18 === [__U_MULTI_f_storage_repos_ultimate_trunk_examples_svcomp_loop_invgen_string_concat_noarr_true_unreach_call_true_termination_i____VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-09-10 10:14:48,991 INFO L82 PathProgramCache]: Analyzing trace with hash -314283949, now seen corresponding path program 14 times [2018-09-10 10:14:48,991 INFO L69 tionRefinementEngine]: Using refinement strategy RubberTaipanRefinementStrategy [2018-09-10 10:14:48,991 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-10 10:14:48,992 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-10 10:14:48,992 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-10 10:14:48,992 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-09-10 10:14:49,005 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-10 10:14:49,795 INFO L134 CoverageAnalysis]: Checked inductivity of 1368 backedges. 0 proven. 1368 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:14:49,795 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-10 10:14:49,795 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-09-10 10:14:49,804 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-09-10 10:14:49,804 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-09-10 10:14:49,846 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-09-10 10:14:49,847 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-10 10:14:49,851 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-10 10:14:49,875 INFO L134 CoverageAnalysis]: Checked inductivity of 1368 backedges. 0 proven. 1368 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:14:49,875 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-10 10:14:51,671 INFO L134 CoverageAnalysis]: Checked inductivity of 1368 backedges. 0 proven. 1368 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:14:51,691 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-10 10:14:51,691 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4nyu Starting monitored process 31 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 31 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-09-10 10:14:51,707 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-09-10 10:14:51,708 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-09-10 10:14:51,792 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-09-10 10:14:51,792 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-10 10:14:51,797 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-10 10:14:51,815 INFO L134 CoverageAnalysis]: Checked inductivity of 1368 backedges. 0 proven. 1368 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:14:51,815 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-10 10:14:51,846 INFO L134 CoverageAnalysis]: Checked inductivity of 1368 backedges. 0 proven. 1368 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:14:51,847 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-09-10 10:14:51,848 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [40, 40, 40, 40, 40] total 78 [2018-09-10 10:14:51,848 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-09-10 10:14:51,848 INFO L459 AbstractCegarLoop]: Interpolant automaton has 40 states [2018-09-10 10:14:51,849 INFO L147 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2018-09-10 10:14:51,851 INFO L148 InterpolantAutomaton]: CoverageRelationStatistics Valid=2711, Invalid=3295, Unknown=0, NotChecked=0, Total=6006 [2018-09-10 10:14:51,851 INFO L87 Difference]: Start difference. First operand 240 states and 270 transitions. Second operand 40 states. [2018-09-10 10:14:52,370 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-10 10:14:52,371 INFO L93 Difference]: Finished difference Result 358 states and 395 transitions. [2018-09-10 10:14:52,371 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2018-09-10 10:14:52,371 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 123 [2018-09-10 10:14:52,372 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-10 10:14:52,374 INFO L225 Difference]: With dead ends: 358 [2018-09-10 10:14:52,375 INFO L226 Difference]: Without dead ends: 352 [2018-09-10 10:14:52,377 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 531 GetRequests, 454 SyntacticMatches, 0 SemanticMatches, 77 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 248 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=2717, Invalid=3445, Unknown=0, NotChecked=0, Total=6162 [2018-09-10 10:14:52,377 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 352 states. [2018-09-10 10:14:52,382 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 352 to 247. [2018-09-10 10:14:52,382 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 247 states. [2018-09-10 10:14:52,383 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 247 states to 247 states and 278 transitions. [2018-09-10 10:14:52,383 INFO L78 Accepts]: Start accepts. Automaton has 247 states and 278 transitions. Word has length 123 [2018-09-10 10:14:52,384 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-10 10:14:52,384 INFO L480 AbstractCegarLoop]: Abstraction has 247 states and 278 transitions. [2018-09-10 10:14:52,384 INFO L481 AbstractCegarLoop]: Interpolant automaton has 40 states. [2018-09-10 10:14:52,384 INFO L276 IsEmpty]: Start isEmpty. Operand 247 states and 278 transitions. [2018-09-10 10:14:52,385 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 127 [2018-09-10 10:14:52,385 INFO L368 BasicCegarLoop]: Found error trace [2018-09-10 10:14:52,385 INFO L376 BasicCegarLoop]: trace histogram [31, 31, 30, 7, 7, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-09-10 10:14:52,386 INFO L423 AbstractCegarLoop]: === Iteration 19 === [__U_MULTI_f_storage_repos_ultimate_trunk_examples_svcomp_loop_invgen_string_concat_noarr_true_unreach_call_true_termination_i____VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-09-10 10:14:52,386 INFO L82 PathProgramCache]: Analyzing trace with hash 738362484, now seen corresponding path program 15 times [2018-09-10 10:14:52,386 INFO L69 tionRefinementEngine]: Using refinement strategy RubberTaipanRefinementStrategy [2018-09-10 10:14:52,387 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-10 10:14:52,387 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-10 10:14:52,387 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-10 10:14:52,387 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-09-10 10:14:52,400 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-10 10:14:53,215 INFO L134 CoverageAnalysis]: Checked inductivity of 1458 backedges. 0 proven. 1458 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:14:53,215 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-10 10:14:53,215 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 32 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 32 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-09-10 10:14:53,223 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-09-10 10:14:53,223 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-09-10 10:14:53,254 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 7 check-sat command(s) [2018-09-10 10:14:53,254 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-10 10:14:53,257 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-10 10:14:53,606 INFO L134 CoverageAnalysis]: Checked inductivity of 1458 backedges. 0 proven. 63 refuted. 0 times theorem prover too weak. 1395 trivial. 0 not checked. [2018-09-10 10:14:53,607 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-10 10:14:53,899 INFO L134 CoverageAnalysis]: Checked inductivity of 1458 backedges. 0 proven. 63 refuted. 0 times theorem prover too weak. 1395 trivial. 0 not checked. [2018-09-10 10:14:53,919 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-10 10:14:53,919 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4nyu Starting monitored process 33 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 33 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-09-10 10:14:53,938 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-09-10 10:14:53,938 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-09-10 10:14:54,006 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 7 check-sat command(s) [2018-09-10 10:14:54,006 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-10 10:14:54,010 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-10 10:14:54,020 INFO L134 CoverageAnalysis]: Checked inductivity of 1458 backedges. 0 proven. 63 refuted. 0 times theorem prover too weak. 1395 trivial. 0 not checked. [2018-09-10 10:14:54,020 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-10 10:14:54,030 INFO L134 CoverageAnalysis]: Checked inductivity of 1458 backedges. 0 proven. 63 refuted. 0 times theorem prover too weak. 1395 trivial. 0 not checked. [2018-09-10 10:14:54,031 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-09-10 10:14:54,032 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [41, 11, 11, 11, 11] total 57 [2018-09-10 10:14:54,032 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-09-10 10:14:54,032 INFO L459 AbstractCegarLoop]: Interpolant automaton has 48 states [2018-09-10 10:14:54,033 INFO L147 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2018-09-10 10:14:54,034 INFO L148 InterpolantAutomaton]: CoverageRelationStatistics Valid=1388, Invalid=1804, Unknown=0, NotChecked=0, Total=3192 [2018-09-10 10:14:54,034 INFO L87 Difference]: Start difference. First operand 247 states and 278 transitions. Second operand 48 states. [2018-09-10 10:14:55,725 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-10 10:14:55,725 INFO L93 Difference]: Finished difference Result 473 states and 525 transitions. [2018-09-10 10:14:55,726 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2018-09-10 10:14:55,726 INFO L78 Accepts]: Start accepts. Automaton has 48 states. Word has length 126 [2018-09-10 10:14:55,726 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-10 10:14:55,729 INFO L225 Difference]: With dead ends: 473 [2018-09-10 10:14:55,730 INFO L226 Difference]: Without dead ends: 453 [2018-09-10 10:14:55,731 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 544 GetRequests, 488 SyntacticMatches, 0 SemanticMatches, 56 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 179 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=1394, Invalid=1912, Unknown=0, NotChecked=0, Total=3306 [2018-09-10 10:14:55,731 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 453 states. [2018-09-10 10:14:55,736 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 453 to 299. [2018-09-10 10:14:55,736 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 299 states. [2018-09-10 10:14:55,737 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 299 states to 299 states and 337 transitions. [2018-09-10 10:14:55,738 INFO L78 Accepts]: Start accepts. Automaton has 299 states and 337 transitions. Word has length 126 [2018-09-10 10:14:55,738 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-10 10:14:55,738 INFO L480 AbstractCegarLoop]: Abstraction has 299 states and 337 transitions. [2018-09-10 10:14:55,738 INFO L481 AbstractCegarLoop]: Interpolant automaton has 48 states. [2018-09-10 10:14:55,738 INFO L276 IsEmpty]: Start isEmpty. Operand 299 states and 337 transitions. [2018-09-10 10:14:55,739 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 151 [2018-09-10 10:14:55,739 INFO L368 BasicCegarLoop]: Found error trace [2018-09-10 10:14:55,740 INFO L376 BasicCegarLoop]: trace histogram [38, 38, 37, 8, 8, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-09-10 10:14:55,740 INFO L423 AbstractCegarLoop]: === Iteration 20 === [__U_MULTI_f_storage_repos_ultimate_trunk_examples_svcomp_loop_invgen_string_concat_noarr_true_unreach_call_true_termination_i____VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-09-10 10:14:55,740 INFO L82 PathProgramCache]: Analyzing trace with hash -1973406962, now seen corresponding path program 16 times [2018-09-10 10:14:55,740 INFO L69 tionRefinementEngine]: Using refinement strategy RubberTaipanRefinementStrategy [2018-09-10 10:14:55,741 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-10 10:14:55,741 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-10 10:14:55,741 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-10 10:14:55,741 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-09-10 10:14:55,756 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-10 10:14:56,842 INFO L134 CoverageAnalysis]: Checked inductivity of 2193 backedges. 0 proven. 2193 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:14:56,842 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-10 10:14:56,842 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 34 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 34 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-09-10 10:14:56,849 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-09-10 10:14:56,849 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-09-10 10:14:56,895 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-09-10 10:14:56,895 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-10 10:14:56,898 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-10 10:14:56,931 INFO L134 CoverageAnalysis]: Checked inductivity of 2193 backedges. 0 proven. 2193 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:14:56,932 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-10 10:14:59,293 INFO L134 CoverageAnalysis]: Checked inductivity of 2193 backedges. 0 proven. 2193 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:14:59,313 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-10 10:14:59,313 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4nyu Starting monitored process 35 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 35 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-09-10 10:14:59,328 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-09-10 10:14:59,328 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-09-10 10:14:59,427 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-09-10 10:14:59,427 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-10 10:14:59,434 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-10 10:14:59,466 INFO L134 CoverageAnalysis]: Checked inductivity of 2193 backedges. 0 proven. 2193 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:14:59,466 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-10 10:14:59,546 INFO L134 CoverageAnalysis]: Checked inductivity of 2193 backedges. 0 proven. 2193 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:14:59,548 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-09-10 10:14:59,549 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [49, 49, 49, 49, 49] total 96 [2018-09-10 10:14:59,549 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-09-10 10:14:59,549 INFO L459 AbstractCegarLoop]: Interpolant automaton has 49 states [2018-09-10 10:14:59,550 INFO L147 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2018-09-10 10:14:59,551 INFO L148 InterpolantAutomaton]: CoverageRelationStatistics Valid=4196, Invalid=4924, Unknown=0, NotChecked=0, Total=9120 [2018-09-10 10:14:59,551 INFO L87 Difference]: Start difference. First operand 299 states and 337 transitions. Second operand 49 states. [2018-09-10 10:15:00,499 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-10 10:15:00,499 INFO L93 Difference]: Finished difference Result 445 states and 491 transitions. [2018-09-10 10:15:00,499 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2018-09-10 10:15:00,499 INFO L78 Accepts]: Start accepts. Automaton has 49 states. Word has length 150 [2018-09-10 10:15:00,500 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-10 10:15:00,502 INFO L225 Difference]: With dead ends: 445 [2018-09-10 10:15:00,502 INFO L226 Difference]: Without dead ends: 439 [2018-09-10 10:15:00,503 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 648 GetRequests, 553 SyntacticMatches, 0 SemanticMatches, 95 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 311 ImplicationChecksByTransitivity, 3.4s TimeCoverageRelationStatistics Valid=4202, Invalid=5110, Unknown=0, NotChecked=0, Total=9312 [2018-09-10 10:15:00,504 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 439 states. [2018-09-10 10:15:00,509 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 439 to 306. [2018-09-10 10:15:00,509 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 306 states. [2018-09-10 10:15:00,510 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 306 states to 306 states and 345 transitions. [2018-09-10 10:15:00,510 INFO L78 Accepts]: Start accepts. Automaton has 306 states and 345 transitions. Word has length 150 [2018-09-10 10:15:00,511 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-10 10:15:00,511 INFO L480 AbstractCegarLoop]: Abstraction has 306 states and 345 transitions. [2018-09-10 10:15:00,511 INFO L481 AbstractCegarLoop]: Interpolant automaton has 49 states. [2018-09-10 10:15:00,511 INFO L276 IsEmpty]: Start isEmpty. Operand 306 states and 345 transitions. [2018-09-10 10:15:00,512 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 154 [2018-09-10 10:15:00,512 INFO L368 BasicCegarLoop]: Found error trace [2018-09-10 10:15:00,512 INFO L376 BasicCegarLoop]: trace histogram [39, 39, 38, 8, 8, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-09-10 10:15:00,512 INFO L423 AbstractCegarLoop]: === Iteration 21 === [__U_MULTI_f_storage_repos_ultimate_trunk_examples_svcomp_loop_invgen_string_concat_noarr_true_unreach_call_true_termination_i____VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-09-10 10:15:00,513 INFO L82 PathProgramCache]: Analyzing trace with hash -324892083, now seen corresponding path program 17 times [2018-09-10 10:15:00,513 INFO L69 tionRefinementEngine]: Using refinement strategy RubberTaipanRefinementStrategy [2018-09-10 10:15:00,513 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-10 10:15:00,514 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-10 10:15:00,514 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-10 10:15:00,514 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-09-10 10:15:00,530 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-10 10:15:01,528 INFO L134 CoverageAnalysis]: Checked inductivity of 2307 backedges. 0 proven. 2307 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:15:01,528 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-10 10:15:01,528 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 36 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 36 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-09-10 10:15:01,535 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-09-10 10:15:01,535 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-09-10 10:15:01,622 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 39 check-sat command(s) [2018-09-10 10:15:01,622 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-10 10:15:01,626 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-10 10:15:01,658 INFO L134 CoverageAnalysis]: Checked inductivity of 2307 backedges. 0 proven. 2307 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:15:01,658 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-10 10:15:04,554 INFO L134 CoverageAnalysis]: Checked inductivity of 2307 backedges. 0 proven. 2307 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:15:04,574 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-10 10:15:04,575 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4nyu Starting monitored process 37 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 37 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-09-10 10:15:04,606 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-09-10 10:15:04,606 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-09-10 10:15:05,069 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 39 check-sat command(s) [2018-09-10 10:15:05,070 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-10 10:15:05,076 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-10 10:15:05,105 INFO L134 CoverageAnalysis]: Checked inductivity of 2307 backedges. 0 proven. 2307 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:15:05,105 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-10 10:15:05,139 INFO L134 CoverageAnalysis]: Checked inductivity of 2307 backedges. 0 proven. 2307 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:15:05,141 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-09-10 10:15:05,142 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [50, 50, 50, 50, 50] total 98 [2018-09-10 10:15:05,142 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-09-10 10:15:05,143 INFO L459 AbstractCegarLoop]: Interpolant automaton has 50 states [2018-09-10 10:15:05,143 INFO L147 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2018-09-10 10:15:05,144 INFO L148 InterpolantAutomaton]: CoverageRelationStatistics Valid=4381, Invalid=5125, Unknown=0, NotChecked=0, Total=9506 [2018-09-10 10:15:05,144 INFO L87 Difference]: Start difference. First operand 306 states and 345 transitions. Second operand 50 states. [2018-09-10 10:15:05,817 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-10 10:15:05,817 INFO L93 Difference]: Finished difference Result 452 states and 499 transitions. [2018-09-10 10:15:05,818 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2018-09-10 10:15:05,818 INFO L78 Accepts]: Start accepts. Automaton has 50 states. Word has length 153 [2018-09-10 10:15:05,818 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-10 10:15:05,821 INFO L225 Difference]: With dead ends: 452 [2018-09-10 10:15:05,821 INFO L226 Difference]: Without dead ends: 446 [2018-09-10 10:15:05,822 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 661 GetRequests, 564 SyntacticMatches, 0 SemanticMatches, 97 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 318 ImplicationChecksByTransitivity, 3.8s TimeCoverageRelationStatistics Valid=4387, Invalid=5315, Unknown=0, NotChecked=0, Total=9702 [2018-09-10 10:15:05,823 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 446 states. [2018-09-10 10:15:05,828 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 446 to 313. [2018-09-10 10:15:05,828 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 313 states. [2018-09-10 10:15:05,829 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 313 states to 313 states and 353 transitions. [2018-09-10 10:15:05,830 INFO L78 Accepts]: Start accepts. Automaton has 313 states and 353 transitions. Word has length 153 [2018-09-10 10:15:05,830 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-10 10:15:05,830 INFO L480 AbstractCegarLoop]: Abstraction has 313 states and 353 transitions. [2018-09-10 10:15:05,830 INFO L481 AbstractCegarLoop]: Interpolant automaton has 50 states. [2018-09-10 10:15:05,830 INFO L276 IsEmpty]: Start isEmpty. Operand 313 states and 353 transitions. [2018-09-10 10:15:05,831 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 157 [2018-09-10 10:15:05,832 INFO L368 BasicCegarLoop]: Found error trace [2018-09-10 10:15:05,832 INFO L376 BasicCegarLoop]: trace histogram [40, 40, 39, 8, 8, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-09-10 10:15:05,832 INFO L423 AbstractCegarLoop]: === Iteration 22 === [__U_MULTI_f_storage_repos_ultimate_trunk_examples_svcomp_loop_invgen_string_concat_noarr_true_unreach_call_true_termination_i____VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-09-10 10:15:05,832 INFO L82 PathProgramCache]: Analyzing trace with hash 1925805742, now seen corresponding path program 18 times [2018-09-10 10:15:05,832 INFO L69 tionRefinementEngine]: Using refinement strategy RubberTaipanRefinementStrategy [2018-09-10 10:15:05,833 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-10 10:15:05,833 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-10 10:15:05,833 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-10 10:15:05,833 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-09-10 10:15:05,848 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-10 10:15:06,809 INFO L134 CoverageAnalysis]: Checked inductivity of 2424 backedges. 0 proven. 2424 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:15:06,810 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-10 10:15:06,810 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 38 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 38 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-09-10 10:15:06,817 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-09-10 10:15:06,817 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-09-10 10:15:06,857 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 15 check-sat command(s) [2018-09-10 10:15:06,857 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-10 10:15:06,861 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-10 10:15:07,200 INFO L134 CoverageAnalysis]: Checked inductivity of 2424 backedges. 0 proven. 84 refuted. 0 times theorem prover too weak. 2340 trivial. 0 not checked. [2018-09-10 10:15:07,201 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-10 10:15:07,604 INFO L134 CoverageAnalysis]: Checked inductivity of 2424 backedges. 0 proven. 84 refuted. 0 times theorem prover too weak. 2340 trivial. 0 not checked. [2018-09-10 10:15:07,624 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-10 10:15:07,624 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4nyu Starting monitored process 39 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 39 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-09-10 10:15:07,639 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-09-10 10:15:07,639 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-09-10 10:15:07,797 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 15 check-sat command(s) [2018-09-10 10:15:07,797 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-10 10:15:07,803 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-10 10:15:07,820 INFO L134 CoverageAnalysis]: Checked inductivity of 2424 backedges. 0 proven. 84 refuted. 0 times theorem prover too weak. 2340 trivial. 0 not checked. [2018-09-10 10:15:07,821 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-10 10:15:07,888 INFO L134 CoverageAnalysis]: Checked inductivity of 2424 backedges. 0 proven. 84 refuted. 0 times theorem prover too weak. 2340 trivial. 0 not checked. [2018-09-10 10:15:07,889 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-09-10 10:15:07,890 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [51, 12, 12, 12, 12] total 69 [2018-09-10 10:15:07,890 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-09-10 10:15:07,890 INFO L459 AbstractCegarLoop]: Interpolant automaton has 59 states [2018-09-10 10:15:07,891 INFO L147 InterpolantAutomaton]: Constructing interpolant automaton starting with 59 interpolants. [2018-09-10 10:15:07,892 INFO L148 InterpolantAutomaton]: CoverageRelationStatistics Valid=2090, Invalid=2602, Unknown=0, NotChecked=0, Total=4692 [2018-09-10 10:15:07,892 INFO L87 Difference]: Start difference. First operand 313 states and 353 transitions. Second operand 59 states. [2018-09-10 10:15:09,222 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-10 10:15:09,222 INFO L93 Difference]: Finished difference Result 594 states and 658 transitions. [2018-09-10 10:15:09,225 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 59 states. [2018-09-10 10:15:09,225 INFO L78 Accepts]: Start accepts. Automaton has 59 states. Word has length 156 [2018-09-10 10:15:09,226 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-10 10:15:09,228 INFO L225 Difference]: With dead ends: 594 [2018-09-10 10:15:09,228 INFO L226 Difference]: Without dead ends: 572 [2018-09-10 10:15:09,229 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 674 GetRequests, 606 SyntacticMatches, 0 SemanticMatches, 68 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 224 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=2096, Invalid=2734, Unknown=0, NotChecked=0, Total=4830 [2018-09-10 10:15:09,230 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 572 states. [2018-09-10 10:15:09,235 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 572 to 372. [2018-09-10 10:15:09,236 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 372 states. [2018-09-10 10:15:09,237 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 372 states to 372 states and 420 transitions. [2018-09-10 10:15:09,237 INFO L78 Accepts]: Start accepts. Automaton has 372 states and 420 transitions. Word has length 156 [2018-09-10 10:15:09,237 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-10 10:15:09,237 INFO L480 AbstractCegarLoop]: Abstraction has 372 states and 420 transitions. [2018-09-10 10:15:09,237 INFO L481 AbstractCegarLoop]: Interpolant automaton has 59 states. [2018-09-10 10:15:09,238 INFO L276 IsEmpty]: Start isEmpty. Operand 372 states and 420 transitions. [2018-09-10 10:15:09,239 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 184 [2018-09-10 10:15:09,239 INFO L368 BasicCegarLoop]: Found error trace [2018-09-10 10:15:09,239 INFO L376 BasicCegarLoop]: trace histogram [48, 48, 47, 9, 9, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-09-10 10:15:09,239 INFO L423 AbstractCegarLoop]: === Iteration 23 === [__U_MULTI_f_storage_repos_ultimate_trunk_examples_svcomp_loop_invgen_string_concat_noarr_true_unreach_call_true_termination_i____VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-09-10 10:15:09,240 INFO L82 PathProgramCache]: Analyzing trace with hash -252635693, now seen corresponding path program 19 times [2018-09-10 10:15:09,240 INFO L69 tionRefinementEngine]: Using refinement strategy RubberTaipanRefinementStrategy [2018-09-10 10:15:09,240 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-10 10:15:09,240 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-10 10:15:09,240 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-10 10:15:09,241 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-09-10 10:15:09,260 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-10 10:15:10,934 INFO L134 CoverageAnalysis]: Checked inductivity of 3492 backedges. 0 proven. 3492 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:15:10,934 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-10 10:15:10,935 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 40 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 40 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-09-10 10:15:10,943 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-10 10:15:10,943 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-09-10 10:15:11,002 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-10 10:15:11,006 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-10 10:15:11,050 INFO L134 CoverageAnalysis]: Checked inductivity of 3492 backedges. 0 proven. 3492 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:15:11,050 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-10 10:15:15,429 INFO L134 CoverageAnalysis]: Checked inductivity of 3492 backedges. 0 proven. 3492 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:15:15,451 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-10 10:15:15,451 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4nyu Starting monitored process 41 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 41 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-09-10 10:15:15,468 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-10 10:15:15,468 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-09-10 10:15:15,592 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-10 10:15:15,602 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-10 10:15:15,651 INFO L134 CoverageAnalysis]: Checked inductivity of 3492 backedges. 0 proven. 3492 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:15:15,651 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-10 10:15:15,754 INFO L134 CoverageAnalysis]: Checked inductivity of 3492 backedges. 0 proven. 3492 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:15:15,756 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-09-10 10:15:15,756 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [60, 60, 60, 60, 60] total 118 [2018-09-10 10:15:15,756 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-09-10 10:15:15,757 INFO L459 AbstractCegarLoop]: Interpolant automaton has 60 states [2018-09-10 10:15:15,757 INFO L147 InterpolantAutomaton]: Constructing interpolant automaton starting with 60 interpolants. [2018-09-10 10:15:15,758 INFO L148 InterpolantAutomaton]: CoverageRelationStatistics Valid=6451, Invalid=7355, Unknown=0, NotChecked=0, Total=13806 [2018-09-10 10:15:15,758 INFO L87 Difference]: Start difference. First operand 372 states and 420 transitions. Second operand 60 states. [2018-09-10 10:15:16,888 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-10 10:15:16,888 INFO L93 Difference]: Finished difference Result 549 states and 606 transitions. [2018-09-10 10:15:16,888 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 60 states. [2018-09-10 10:15:16,888 INFO L78 Accepts]: Start accepts. Automaton has 60 states. Word has length 183 [2018-09-10 10:15:16,889 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-10 10:15:16,892 INFO L225 Difference]: With dead ends: 549 [2018-09-10 10:15:16,892 INFO L226 Difference]: Without dead ends: 543 [2018-09-10 10:15:16,893 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 791 GetRequests, 674 SyntacticMatches, 0 SemanticMatches, 117 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 388 ImplicationChecksByTransitivity, 5.9s TimeCoverageRelationStatistics Valid=6457, Invalid=7585, Unknown=0, NotChecked=0, Total=14042 [2018-09-10 10:15:16,894 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 543 states. [2018-09-10 10:15:16,899 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 543 to 379. [2018-09-10 10:15:16,900 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 379 states. [2018-09-10 10:15:16,901 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 379 states to 379 states and 428 transitions. [2018-09-10 10:15:16,901 INFO L78 Accepts]: Start accepts. Automaton has 379 states and 428 transitions. Word has length 183 [2018-09-10 10:15:16,901 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-10 10:15:16,901 INFO L480 AbstractCegarLoop]: Abstraction has 379 states and 428 transitions. [2018-09-10 10:15:16,902 INFO L481 AbstractCegarLoop]: Interpolant automaton has 60 states. [2018-09-10 10:15:16,902 INFO L276 IsEmpty]: Start isEmpty. Operand 379 states and 428 transitions. [2018-09-10 10:15:16,903 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 187 [2018-09-10 10:15:16,903 INFO L368 BasicCegarLoop]: Found error trace [2018-09-10 10:15:16,903 INFO L376 BasicCegarLoop]: trace histogram [49, 49, 48, 9, 9, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-09-10 10:15:16,904 INFO L423 AbstractCegarLoop]: === Iteration 24 === [__U_MULTI_f_storage_repos_ultimate_trunk_examples_svcomp_loop_invgen_string_concat_noarr_true_unreach_call_true_termination_i____VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-09-10 10:15:16,904 INFO L82 PathProgramCache]: Analyzing trace with hash 895935092, now seen corresponding path program 20 times [2018-09-10 10:15:16,904 INFO L69 tionRefinementEngine]: Using refinement strategy RubberTaipanRefinementStrategy [2018-09-10 10:15:16,905 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-10 10:15:16,905 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-10 10:15:16,905 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-10 10:15:16,905 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-09-10 10:15:16,927 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-10 10:15:18,500 INFO L134 CoverageAnalysis]: Checked inductivity of 3636 backedges. 0 proven. 3636 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:15:18,500 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-10 10:15:18,500 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 42 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 42 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-09-10 10:15:18,517 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-09-10 10:15:18,517 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-09-10 10:15:18,591 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-09-10 10:15:18,592 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-10 10:15:18,596 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-10 10:15:18,633 INFO L134 CoverageAnalysis]: Checked inductivity of 3636 backedges. 0 proven. 3636 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:15:18,633 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-10 10:15:22,791 INFO L134 CoverageAnalysis]: Checked inductivity of 3636 backedges. 0 proven. 3636 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:15:22,820 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-10 10:15:22,821 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4nyu Starting monitored process 43 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 43 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-09-10 10:15:22,844 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-09-10 10:15:22,844 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-09-10 10:15:22,963 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-09-10 10:15:22,963 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-10 10:15:22,970 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-10 10:15:23,008 INFO L134 CoverageAnalysis]: Checked inductivity of 3636 backedges. 0 proven. 3636 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:15:23,008 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-10 10:15:23,052 INFO L134 CoverageAnalysis]: Checked inductivity of 3636 backedges. 0 proven. 3636 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:15:23,053 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-09-10 10:15:23,054 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [61, 61, 61, 61, 61] total 120 [2018-09-10 10:15:23,054 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-09-10 10:15:23,054 INFO L459 AbstractCegarLoop]: Interpolant automaton has 61 states [2018-09-10 10:15:23,055 INFO L147 InterpolantAutomaton]: Constructing interpolant automaton starting with 61 interpolants. [2018-09-10 10:15:23,055 INFO L148 InterpolantAutomaton]: CoverageRelationStatistics Valid=6680, Invalid=7600, Unknown=0, NotChecked=0, Total=14280 [2018-09-10 10:15:23,055 INFO L87 Difference]: Start difference. First operand 379 states and 428 transitions. Second operand 61 states. [2018-09-10 10:15:24,827 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-10 10:15:24,828 INFO L93 Difference]: Finished difference Result 556 states and 614 transitions. [2018-09-10 10:15:24,828 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 61 states. [2018-09-10 10:15:24,828 INFO L78 Accepts]: Start accepts. Automaton has 61 states. Word has length 186 [2018-09-10 10:15:24,829 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-10 10:15:24,832 INFO L225 Difference]: With dead ends: 556 [2018-09-10 10:15:24,832 INFO L226 Difference]: Without dead ends: 550 [2018-09-10 10:15:24,833 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 804 GetRequests, 685 SyntacticMatches, 0 SemanticMatches, 119 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 395 ImplicationChecksByTransitivity, 5.6s TimeCoverageRelationStatistics Valid=6686, Invalid=7834, Unknown=0, NotChecked=0, Total=14520 [2018-09-10 10:15:24,833 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 550 states. [2018-09-10 10:15:24,838 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 550 to 386. [2018-09-10 10:15:24,839 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 386 states. [2018-09-10 10:15:24,840 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 386 states to 386 states and 436 transitions. [2018-09-10 10:15:24,840 INFO L78 Accepts]: Start accepts. Automaton has 386 states and 436 transitions. Word has length 186 [2018-09-10 10:15:24,840 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-10 10:15:24,840 INFO L480 AbstractCegarLoop]: Abstraction has 386 states and 436 transitions. [2018-09-10 10:15:24,841 INFO L481 AbstractCegarLoop]: Interpolant automaton has 61 states. [2018-09-10 10:15:24,841 INFO L276 IsEmpty]: Start isEmpty. Operand 386 states and 436 transitions. [2018-09-10 10:15:24,842 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 190 [2018-09-10 10:15:24,842 INFO L368 BasicCegarLoop]: Found error trace [2018-09-10 10:15:24,842 INFO L376 BasicCegarLoop]: trace histogram [50, 50, 49, 9, 9, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-09-10 10:15:24,843 INFO L423 AbstractCegarLoop]: === Iteration 25 === [__U_MULTI_f_storage_repos_ultimate_trunk_examples_svcomp_loop_invgen_string_concat_noarr_true_unreach_call_true_termination_i____VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-09-10 10:15:24,843 INFO L82 PathProgramCache]: Analyzing trace with hash -36256205, now seen corresponding path program 21 times [2018-09-10 10:15:24,843 INFO L69 tionRefinementEngine]: Using refinement strategy RubberTaipanRefinementStrategy [2018-09-10 10:15:24,844 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-10 10:15:24,844 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-10 10:15:24,844 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-10 10:15:24,844 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-09-10 10:15:24,866 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-10 10:15:26,806 INFO L134 CoverageAnalysis]: Checked inductivity of 3783 backedges. 0 proven. 3783 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:15:26,806 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-10 10:15:26,806 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 44 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 44 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-09-10 10:15:26,815 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-09-10 10:15:26,815 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-09-10 10:15:26,921 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2018-09-10 10:15:26,921 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-10 10:15:26,924 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-10 10:15:27,432 INFO L134 CoverageAnalysis]: Checked inductivity of 3783 backedges. 0 proven. 108 refuted. 0 times theorem prover too weak. 3675 trivial. 0 not checked. [2018-09-10 10:15:27,432 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-10 10:15:27,967 INFO L134 CoverageAnalysis]: Checked inductivity of 3783 backedges. 0 proven. 108 refuted. 0 times theorem prover too weak. 3675 trivial. 0 not checked. [2018-09-10 10:15:27,986 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-10 10:15:27,987 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4nyu Starting monitored process 45 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 45 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-09-10 10:15:28,001 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-09-10 10:15:28,002 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-09-10 10:15:28,134 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2018-09-10 10:15:28,134 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-10 10:15:28,140 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-10 10:15:28,163 INFO L134 CoverageAnalysis]: Checked inductivity of 3783 backedges. 0 proven. 108 refuted. 0 times theorem prover too weak. 3675 trivial. 0 not checked. [2018-09-10 10:15:28,163 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-10 10:15:28,254 INFO L134 CoverageAnalysis]: Checked inductivity of 3783 backedges. 0 proven. 108 refuted. 0 times theorem prover too weak. 3675 trivial. 0 not checked. [2018-09-10 10:15:28,258 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-09-10 10:15:28,259 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [62, 13, 13, 13, 13] total 82 [2018-09-10 10:15:28,259 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-09-10 10:15:28,260 INFO L459 AbstractCegarLoop]: Interpolant automaton has 71 states [2018-09-10 10:15:28,261 INFO L147 InterpolantAutomaton]: Constructing interpolant automaton starting with 71 interpolants. [2018-09-10 10:15:28,261 INFO L148 InterpolantAutomaton]: CoverageRelationStatistics Valid=3013, Invalid=3629, Unknown=0, NotChecked=0, Total=6642 [2018-09-10 10:15:28,261 INFO L87 Difference]: Start difference. First operand 386 states and 436 transitions. Second operand 71 states. [2018-09-10 10:15:30,188 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-10 10:15:30,188 INFO L93 Difference]: Finished difference Result 728 states and 805 transitions. [2018-09-10 10:15:30,189 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 71 states. [2018-09-10 10:15:30,189 INFO L78 Accepts]: Start accepts. Automaton has 71 states. Word has length 189 [2018-09-10 10:15:30,189 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-10 10:15:30,191 INFO L225 Difference]: With dead ends: 728 [2018-09-10 10:15:30,192 INFO L226 Difference]: Without dead ends: 704 [2018-09-10 10:15:30,192 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 817 GetRequests, 736 SyntacticMatches, 0 SemanticMatches, 81 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 273 ImplicationChecksByTransitivity, 2.9s TimeCoverageRelationStatistics Valid=3019, Invalid=3787, Unknown=0, NotChecked=0, Total=6806 [2018-09-10 10:15:30,193 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 704 states. [2018-09-10 10:15:30,200 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 704 to 452. [2018-09-10 10:15:30,200 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 452 states. [2018-09-10 10:15:30,201 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 452 states to 452 states and 511 transitions. [2018-09-10 10:15:30,202 INFO L78 Accepts]: Start accepts. Automaton has 452 states and 511 transitions. Word has length 189 [2018-09-10 10:15:30,202 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-10 10:15:30,202 INFO L480 AbstractCegarLoop]: Abstraction has 452 states and 511 transitions. [2018-09-10 10:15:30,202 INFO L481 AbstractCegarLoop]: Interpolant automaton has 71 states. [2018-09-10 10:15:30,202 INFO L276 IsEmpty]: Start isEmpty. Operand 452 states and 511 transitions. [2018-09-10 10:15:30,204 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 220 [2018-09-10 10:15:30,204 INFO L368 BasicCegarLoop]: Found error trace [2018-09-10 10:15:30,204 INFO L376 BasicCegarLoop]: trace histogram [59, 59, 58, 10, 10, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-09-10 10:15:30,204 INFO L423 AbstractCegarLoop]: === Iteration 26 === [__U_MULTI_f_storage_repos_ultimate_trunk_examples_svcomp_loop_invgen_string_concat_noarr_true_unreach_call_true_termination_i____VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-09-10 10:15:30,204 INFO L82 PathProgramCache]: Analyzing trace with hash -518064979, now seen corresponding path program 22 times [2018-09-10 10:15:30,205 INFO L69 tionRefinementEngine]: Using refinement strategy RubberTaipanRefinementStrategy [2018-09-10 10:15:30,205 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-10 10:15:30,205 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-10 10:15:30,205 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-10 10:15:30,206 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-09-10 10:15:30,232 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-10 10:15:32,358 INFO L134 CoverageAnalysis]: Checked inductivity of 5268 backedges. 0 proven. 5268 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:15:32,359 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-10 10:15:32,359 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 46 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 46 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-09-10 10:15:32,366 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-09-10 10:15:32,367 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-09-10 10:15:32,431 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-09-10 10:15:32,432 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-10 10:15:32,435 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-10 10:15:32,484 INFO L134 CoverageAnalysis]: Checked inductivity of 5268 backedges. 0 proven. 5268 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:15:32,484 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-10 10:15:37,773 INFO L134 CoverageAnalysis]: Checked inductivity of 5268 backedges. 0 proven. 5268 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:15:37,793 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-10 10:15:37,793 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4nyu Starting monitored process 47 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 47 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-09-10 10:15:37,809 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-09-10 10:15:37,809 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-09-10 10:15:37,967 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-09-10 10:15:37,968 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-10 10:15:37,979 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-10 10:15:38,043 INFO L134 CoverageAnalysis]: Checked inductivity of 5268 backedges. 0 proven. 5268 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:15:38,043 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-10 10:15:38,156 INFO L134 CoverageAnalysis]: Checked inductivity of 5268 backedges. 0 proven. 5268 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:15:38,158 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-09-10 10:15:38,159 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [72, 72, 72, 72, 72] total 142 [2018-09-10 10:15:38,159 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-09-10 10:15:38,160 INFO L459 AbstractCegarLoop]: Interpolant automaton has 72 states [2018-09-10 10:15:38,161 INFO L147 InterpolantAutomaton]: Constructing interpolant automaton starting with 72 interpolants. [2018-09-10 10:15:38,163 INFO L148 InterpolantAutomaton]: CoverageRelationStatistics Valid=9463, Invalid=10559, Unknown=0, NotChecked=0, Total=20022 [2018-09-10 10:15:38,163 INFO L87 Difference]: Start difference. First operand 452 states and 511 transitions. Second operand 72 states. [2018-09-10 10:15:40,065 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-10 10:15:40,066 INFO L93 Difference]: Finished difference Result 663 states and 732 transitions. [2018-09-10 10:15:40,066 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 72 states. [2018-09-10 10:15:40,066 INFO L78 Accepts]: Start accepts. Automaton has 72 states. Word has length 219 [2018-09-10 10:15:40,067 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-10 10:15:40,070 INFO L225 Difference]: With dead ends: 663 [2018-09-10 10:15:40,070 INFO L226 Difference]: Without dead ends: 657 [2018-09-10 10:15:40,071 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 947 GetRequests, 806 SyntacticMatches, 0 SemanticMatches, 141 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 472 ImplicationChecksByTransitivity, 7.3s TimeCoverageRelationStatistics Valid=9469, Invalid=10837, Unknown=0, NotChecked=0, Total=20306 [2018-09-10 10:15:40,072 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 657 states. [2018-09-10 10:15:40,079 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 657 to 459. [2018-09-10 10:15:40,079 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 459 states. [2018-09-10 10:15:40,080 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 459 states to 459 states and 519 transitions. [2018-09-10 10:15:40,080 INFO L78 Accepts]: Start accepts. Automaton has 459 states and 519 transitions. Word has length 219 [2018-09-10 10:15:40,081 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-10 10:15:40,081 INFO L480 AbstractCegarLoop]: Abstraction has 459 states and 519 transitions. [2018-09-10 10:15:40,081 INFO L481 AbstractCegarLoop]: Interpolant automaton has 72 states. [2018-09-10 10:15:40,081 INFO L276 IsEmpty]: Start isEmpty. Operand 459 states and 519 transitions. [2018-09-10 10:15:40,083 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 223 [2018-09-10 10:15:40,083 INFO L368 BasicCegarLoop]: Found error trace [2018-09-10 10:15:40,083 INFO L376 BasicCegarLoop]: trace histogram [60, 60, 59, 10, 10, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-09-10 10:15:40,083 INFO L423 AbstractCegarLoop]: === Iteration 27 === [__U_MULTI_f_storage_repos_ultimate_trunk_examples_svcomp_loop_invgen_string_concat_noarr_true_unreach_call_true_termination_i____VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-09-10 10:15:40,084 INFO L82 PathProgramCache]: Analyzing trace with hash -399850290, now seen corresponding path program 23 times [2018-09-10 10:15:40,084 INFO L69 tionRefinementEngine]: Using refinement strategy RubberTaipanRefinementStrategy [2018-09-10 10:15:40,084 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-10 10:15:40,084 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-10 10:15:40,084 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-10 10:15:40,085 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-09-10 10:15:40,110 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-10 10:15:42,828 INFO L134 CoverageAnalysis]: Checked inductivity of 5445 backedges. 0 proven. 5445 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:15:42,829 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-10 10:15:42,829 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 48 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 48 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-09-10 10:15:42,836 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-09-10 10:15:42,836 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-09-10 10:15:42,959 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 60 check-sat command(s) [2018-09-10 10:15:42,959 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-10 10:15:42,963 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-10 10:15:43,021 INFO L134 CoverageAnalysis]: Checked inductivity of 5445 backedges. 0 proven. 5445 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:15:43,021 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-10 10:15:48,559 INFO L134 CoverageAnalysis]: Checked inductivity of 5445 backedges. 0 proven. 5445 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:15:48,579 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-10 10:15:48,579 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4nyu Starting monitored process 49 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 49 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-09-10 10:15:48,594 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-09-10 10:15:48,594 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-09-10 10:15:49,545 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 60 check-sat command(s) [2018-09-10 10:15:49,545 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-10 10:15:49,553 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-10 10:15:49,606 INFO L134 CoverageAnalysis]: Checked inductivity of 5445 backedges. 0 proven. 5445 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:15:49,606 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-10 10:15:49,706 INFO L134 CoverageAnalysis]: Checked inductivity of 5445 backedges. 0 proven. 5445 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:15:49,707 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-09-10 10:15:49,708 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [73, 73, 73, 73, 73] total 144 [2018-09-10 10:15:49,708 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-09-10 10:15:49,709 INFO L459 AbstractCegarLoop]: Interpolant automaton has 73 states [2018-09-10 10:15:49,709 INFO L147 InterpolantAutomaton]: Constructing interpolant automaton starting with 73 interpolants. [2018-09-10 10:15:49,710 INFO L148 InterpolantAutomaton]: CoverageRelationStatistics Valid=9740, Invalid=10852, Unknown=0, NotChecked=0, Total=20592 [2018-09-10 10:15:49,710 INFO L87 Difference]: Start difference. First operand 459 states and 519 transitions. Second operand 73 states. [2018-09-10 10:15:51,849 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-10 10:15:51,849 INFO L93 Difference]: Finished difference Result 670 states and 740 transitions. [2018-09-10 10:15:51,850 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 73 states. [2018-09-10 10:15:51,850 INFO L78 Accepts]: Start accepts. Automaton has 73 states. Word has length 222 [2018-09-10 10:15:51,851 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-10 10:15:51,854 INFO L225 Difference]: With dead ends: 670 [2018-09-10 10:15:51,854 INFO L226 Difference]: Without dead ends: 664 [2018-09-10 10:15:51,855 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 960 GetRequests, 817 SyntacticMatches, 0 SemanticMatches, 143 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 479 ImplicationChecksByTransitivity, 8.1s TimeCoverageRelationStatistics Valid=9746, Invalid=11134, Unknown=0, NotChecked=0, Total=20880 [2018-09-10 10:15:51,855 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 664 states. [2018-09-10 10:15:51,863 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 664 to 466. [2018-09-10 10:15:51,863 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 466 states. [2018-09-10 10:15:51,864 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 466 states to 466 states and 527 transitions. [2018-09-10 10:15:51,864 INFO L78 Accepts]: Start accepts. Automaton has 466 states and 527 transitions. Word has length 222 [2018-09-10 10:15:51,865 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-10 10:15:51,865 INFO L480 AbstractCegarLoop]: Abstraction has 466 states and 527 transitions. [2018-09-10 10:15:51,865 INFO L481 AbstractCegarLoop]: Interpolant automaton has 73 states. [2018-09-10 10:15:51,865 INFO L276 IsEmpty]: Start isEmpty. Operand 466 states and 527 transitions. [2018-09-10 10:15:51,867 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 226 [2018-09-10 10:15:51,867 INFO L368 BasicCegarLoop]: Found error trace [2018-09-10 10:15:51,867 INFO L376 BasicCegarLoop]: trace histogram [61, 61, 60, 10, 10, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-09-10 10:15:51,867 INFO L423 AbstractCegarLoop]: === Iteration 28 === [__U_MULTI_f_storage_repos_ultimate_trunk_examples_svcomp_loop_invgen_string_concat_noarr_true_unreach_call_true_termination_i____VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-09-10 10:15:51,867 INFO L82 PathProgramCache]: Analyzing trace with hash -539233011, now seen corresponding path program 24 times [2018-09-10 10:15:51,868 INFO L69 tionRefinementEngine]: Using refinement strategy RubberTaipanRefinementStrategy [2018-09-10 10:15:51,868 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-10 10:15:51,868 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-10 10:15:51,868 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-10 10:15:51,869 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-09-10 10:15:51,895 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-10 10:15:53,887 INFO L134 CoverageAnalysis]: Checked inductivity of 5625 backedges. 0 proven. 5625 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:15:53,887 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-10 10:15:53,888 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 50 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 50 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-09-10 10:15:53,920 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-09-10 10:15:53,920 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-09-10 10:15:53,975 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 19 check-sat command(s) [2018-09-10 10:15:53,975 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-10 10:15:53,978 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-10 10:15:54,552 INFO L134 CoverageAnalysis]: Checked inductivity of 5625 backedges. 0 proven. 135 refuted. 0 times theorem prover too weak. 5490 trivial. 0 not checked. [2018-09-10 10:15:54,552 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-10 10:15:55,313 INFO L134 CoverageAnalysis]: Checked inductivity of 5625 backedges. 0 proven. 135 refuted. 0 times theorem prover too weak. 5490 trivial. 0 not checked. [2018-09-10 10:15:55,333 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-10 10:15:55,333 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4nyu Starting monitored process 51 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 51 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-09-10 10:15:55,348 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-09-10 10:15:55,348 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-09-10 10:15:55,580 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 19 check-sat command(s) [2018-09-10 10:15:55,580 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-10 10:15:55,585 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-10 10:15:55,614 INFO L134 CoverageAnalysis]: Checked inductivity of 5625 backedges. 0 proven. 135 refuted. 0 times theorem prover too weak. 5490 trivial. 0 not checked. [2018-09-10 10:15:55,615 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-10 10:15:55,698 INFO L134 CoverageAnalysis]: Checked inductivity of 5625 backedges. 0 proven. 135 refuted. 0 times theorem prover too weak. 5490 trivial. 0 not checked. [2018-09-10 10:15:55,700 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-09-10 10:15:55,700 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [74, 14, 14, 14, 14] total 96 [2018-09-10 10:15:55,700 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-09-10 10:15:55,701 INFO L459 AbstractCegarLoop]: Interpolant automaton has 84 states [2018-09-10 10:15:55,702 INFO L147 InterpolantAutomaton]: Constructing interpolant automaton starting with 84 interpolants. [2018-09-10 10:15:55,702 INFO L148 InterpolantAutomaton]: CoverageRelationStatistics Valid=4196, Invalid=4924, Unknown=0, NotChecked=0, Total=9120 [2018-09-10 10:15:55,703 INFO L87 Difference]: Start difference. First operand 466 states and 527 transitions. Second operand 84 states. [2018-09-10 10:15:59,399 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-10 10:15:59,399 INFO L93 Difference]: Finished difference Result 875 states and 966 transitions. [2018-09-10 10:15:59,399 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 84 states. [2018-09-10 10:15:59,400 INFO L78 Accepts]: Start accepts. Automaton has 84 states. Word has length 225 [2018-09-10 10:15:59,400 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-10 10:15:59,404 INFO L225 Difference]: With dead ends: 875 [2018-09-10 10:15:59,404 INFO L226 Difference]: Without dead ends: 849 [2018-09-10 10:15:59,405 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 973 GetRequests, 878 SyntacticMatches, 0 SemanticMatches, 95 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 326 ImplicationChecksByTransitivity, 3.2s TimeCoverageRelationStatistics Valid=4202, Invalid=5110, Unknown=0, NotChecked=0, Total=9312 [2018-09-10 10:15:59,405 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 849 states. [2018-09-10 10:15:59,412 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 849 to 539. [2018-09-10 10:15:59,413 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 539 states. [2018-09-10 10:15:59,414 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 539 states to 539 states and 610 transitions. [2018-09-10 10:15:59,414 INFO L78 Accepts]: Start accepts. Automaton has 539 states and 610 transitions. Word has length 225 [2018-09-10 10:15:59,415 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-10 10:15:59,415 INFO L480 AbstractCegarLoop]: Abstraction has 539 states and 610 transitions. [2018-09-10 10:15:59,415 INFO L481 AbstractCegarLoop]: Interpolant automaton has 84 states. [2018-09-10 10:15:59,415 INFO L276 IsEmpty]: Start isEmpty. Operand 539 states and 610 transitions. [2018-09-10 10:15:59,417 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 259 [2018-09-10 10:15:59,417 INFO L368 BasicCegarLoop]: Found error trace [2018-09-10 10:15:59,417 INFO L376 BasicCegarLoop]: trace histogram [71, 71, 70, 11, 11, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-09-10 10:15:59,417 INFO L423 AbstractCegarLoop]: === Iteration 29 === [__U_MULTI_f_storage_repos_ultimate_trunk_examples_svcomp_loop_invgen_string_concat_noarr_true_unreach_call_true_termination_i____VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-09-10 10:15:59,418 INFO L82 PathProgramCache]: Analyzing trace with hash 412573620, now seen corresponding path program 25 times [2018-09-10 10:15:59,418 INFO L69 tionRefinementEngine]: Using refinement strategy RubberTaipanRefinementStrategy [2018-09-10 10:15:59,418 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-10 10:15:59,419 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-10 10:15:59,419 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-10 10:15:59,419 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-09-10 10:15:59,453 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-10 10:16:02,809 INFO L134 CoverageAnalysis]: Checked inductivity of 7620 backedges. 0 proven. 7620 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:16:02,809 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-10 10:16:02,809 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 52 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 52 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-09-10 10:16:02,820 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-10 10:16:02,820 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-09-10 10:16:02,899 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-10 10:16:02,903 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-10 10:16:02,976 INFO L134 CoverageAnalysis]: Checked inductivity of 7620 backedges. 0 proven. 7620 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:16:02,976 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-10 10:16:10,314 INFO L134 CoverageAnalysis]: Checked inductivity of 7620 backedges. 0 proven. 7620 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:16:10,334 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-10 10:16:10,334 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4nyu Starting monitored process 53 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 53 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-09-10 10:16:10,349 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-10 10:16:10,350 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-09-10 10:16:10,518 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-10 10:16:10,528 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-10 10:16:10,594 INFO L134 CoverageAnalysis]: Checked inductivity of 7620 backedges. 0 proven. 7620 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:16:10,594 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-10 10:16:10,745 INFO L134 CoverageAnalysis]: Checked inductivity of 7620 backedges. 0 proven. 7620 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:16:10,747 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-09-10 10:16:10,747 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [85, 85, 85, 85, 85] total 168 [2018-09-10 10:16:10,747 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-09-10 10:16:10,748 INFO L459 AbstractCegarLoop]: Interpolant automaton has 85 states [2018-09-10 10:16:10,749 INFO L147 InterpolantAutomaton]: Constructing interpolant automaton starting with 85 interpolants. [2018-09-10 10:16:10,750 INFO L148 InterpolantAutomaton]: CoverageRelationStatistics Valid=13376, Invalid=14680, Unknown=0, NotChecked=0, Total=28056 [2018-09-10 10:16:10,750 INFO L87 Difference]: Start difference. First operand 539 states and 610 transitions. Second operand 85 states. [2018-09-10 10:16:14,115 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-10 10:16:14,115 INFO L93 Difference]: Finished difference Result 787 states and 869 transitions. [2018-09-10 10:16:14,116 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 85 states. [2018-09-10 10:16:14,116 INFO L78 Accepts]: Start accepts. Automaton has 85 states. Word has length 258 [2018-09-10 10:16:14,117 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-10 10:16:14,121 INFO L225 Difference]: With dead ends: 787 [2018-09-10 10:16:14,122 INFO L226 Difference]: Without dead ends: 781 [2018-09-10 10:16:14,123 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 1116 GetRequests, 949 SyntacticMatches, 0 SemanticMatches, 167 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 563 ImplicationChecksByTransitivity, 10.5s TimeCoverageRelationStatistics Valid=13382, Invalid=15010, Unknown=0, NotChecked=0, Total=28392 [2018-09-10 10:16:14,124 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 781 states. [2018-09-10 10:16:14,130 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 781 to 546. [2018-09-10 10:16:14,131 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 546 states. [2018-09-10 10:16:14,132 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 546 states to 546 states and 618 transitions. [2018-09-10 10:16:14,132 INFO L78 Accepts]: Start accepts. Automaton has 546 states and 618 transitions. Word has length 258 [2018-09-10 10:16:14,133 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-10 10:16:14,133 INFO L480 AbstractCegarLoop]: Abstraction has 546 states and 618 transitions. [2018-09-10 10:16:14,133 INFO L481 AbstractCegarLoop]: Interpolant automaton has 85 states. [2018-09-10 10:16:14,133 INFO L276 IsEmpty]: Start isEmpty. Operand 546 states and 618 transitions. [2018-09-10 10:16:14,135 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 262 [2018-09-10 10:16:14,135 INFO L368 BasicCegarLoop]: Found error trace [2018-09-10 10:16:14,135 INFO L376 BasicCegarLoop]: trace histogram [72, 72, 71, 11, 11, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-09-10 10:16:14,136 INFO L423 AbstractCegarLoop]: === Iteration 30 === [__U_MULTI_f_storage_repos_ultimate_trunk_examples_svcomp_loop_invgen_string_concat_noarr_true_unreach_call_true_termination_i____VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-09-10 10:16:14,136 INFO L82 PathProgramCache]: Analyzing trace with hash 431856755, now seen corresponding path program 26 times [2018-09-10 10:16:14,136 INFO L69 tionRefinementEngine]: Using refinement strategy RubberTaipanRefinementStrategy [2018-09-10 10:16:14,137 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-10 10:16:14,137 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-10 10:16:14,137 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-10 10:16:14,137 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-09-10 10:16:14,171 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-10 10:16:16,743 INFO L134 CoverageAnalysis]: Checked inductivity of 7833 backedges. 0 proven. 7833 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:16:16,744 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-10 10:16:16,744 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 54 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 54 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-09-10 10:16:16,751 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-09-10 10:16:16,751 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-09-10 10:16:16,828 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-09-10 10:16:16,828 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-10 10:16:16,832 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-10 10:16:16,894 INFO L134 CoverageAnalysis]: Checked inductivity of 7833 backedges. 0 proven. 7833 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:16:16,894 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-10 10:16:24,708 INFO L134 CoverageAnalysis]: Checked inductivity of 7833 backedges. 0 proven. 7833 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:16:24,728 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-10 10:16:24,728 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4nyu Starting monitored process 55 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 55 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-09-10 10:16:24,743 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-09-10 10:16:24,743 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-09-10 10:16:24,917 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-09-10 10:16:24,918 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-10 10:16:24,928 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-10 10:16:24,982 INFO L134 CoverageAnalysis]: Checked inductivity of 7833 backedges. 0 proven. 7833 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:16:24,982 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-10 10:16:25,080 INFO L134 CoverageAnalysis]: Checked inductivity of 7833 backedges. 0 proven. 7833 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:16:25,081 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-09-10 10:16:25,082 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [86, 86, 86, 86, 86] total 170 [2018-09-10 10:16:25,082 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-09-10 10:16:25,082 INFO L459 AbstractCegarLoop]: Interpolant automaton has 86 states [2018-09-10 10:16:25,083 INFO L147 InterpolantAutomaton]: Constructing interpolant automaton starting with 86 interpolants. [2018-09-10 10:16:25,084 INFO L148 InterpolantAutomaton]: CoverageRelationStatistics Valid=13705, Invalid=15025, Unknown=0, NotChecked=0, Total=28730 [2018-09-10 10:16:25,084 INFO L87 Difference]: Start difference. First operand 546 states and 618 transitions. Second operand 86 states. [2018-09-10 10:16:28,626 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-10 10:16:28,626 INFO L93 Difference]: Finished difference Result 794 states and 877 transitions. [2018-09-10 10:16:28,629 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 86 states. [2018-09-10 10:16:28,630 INFO L78 Accepts]: Start accepts. Automaton has 86 states. Word has length 261 [2018-09-10 10:16:28,631 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-10 10:16:28,634 INFO L225 Difference]: With dead ends: 794 [2018-09-10 10:16:28,634 INFO L226 Difference]: Without dead ends: 788 [2018-09-10 10:16:28,636 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 1129 GetRequests, 960 SyntacticMatches, 0 SemanticMatches, 169 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 570 ImplicationChecksByTransitivity, 10.2s TimeCoverageRelationStatistics Valid=13711, Invalid=15359, Unknown=0, NotChecked=0, Total=29070 [2018-09-10 10:16:28,636 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 788 states. [2018-09-10 10:16:28,644 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 788 to 553. [2018-09-10 10:16:28,644 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 553 states. [2018-09-10 10:16:28,645 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 553 states to 553 states and 626 transitions. [2018-09-10 10:16:28,646 INFO L78 Accepts]: Start accepts. Automaton has 553 states and 626 transitions. Word has length 261 [2018-09-10 10:16:28,646 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-10 10:16:28,646 INFO L480 AbstractCegarLoop]: Abstraction has 553 states and 626 transitions. [2018-09-10 10:16:28,646 INFO L481 AbstractCegarLoop]: Interpolant automaton has 86 states. [2018-09-10 10:16:28,646 INFO L276 IsEmpty]: Start isEmpty. Operand 553 states and 626 transitions. [2018-09-10 10:16:28,648 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 265 [2018-09-10 10:16:28,648 INFO L368 BasicCegarLoop]: Found error trace [2018-09-10 10:16:28,649 INFO L376 BasicCegarLoop]: trace histogram [73, 73, 72, 11, 11, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-09-10 10:16:28,649 INFO L423 AbstractCegarLoop]: === Iteration 31 === [__U_MULTI_f_storage_repos_ultimate_trunk_examples_svcomp_loop_invgen_string_concat_noarr_true_unreach_call_true_termination_i____VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-09-10 10:16:28,649 INFO L82 PathProgramCache]: Analyzing trace with hash -629886124, now seen corresponding path program 27 times [2018-09-10 10:16:28,649 INFO L69 tionRefinementEngine]: Using refinement strategy RubberTaipanRefinementStrategy [2018-09-10 10:16:28,650 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-10 10:16:28,650 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-10 10:16:28,650 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-10 10:16:28,650 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-09-10 10:16:28,685 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-10 10:16:31,328 INFO L134 CoverageAnalysis]: Checked inductivity of 8049 backedges. 0 proven. 8049 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:16:31,329 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-10 10:16:31,329 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 56 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 56 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-09-10 10:16:31,338 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-09-10 10:16:31,338 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-09-10 10:16:31,411 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 11 check-sat command(s) [2018-09-10 10:16:31,411 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-10 10:16:31,414 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-10 10:16:32,132 INFO L134 CoverageAnalysis]: Checked inductivity of 8049 backedges. 0 proven. 165 refuted. 0 times theorem prover too weak. 7884 trivial. 0 not checked. [2018-09-10 10:16:32,133 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-10 10:16:33,311 INFO L134 CoverageAnalysis]: Checked inductivity of 8049 backedges. 0 proven. 165 refuted. 0 times theorem prover too weak. 7884 trivial. 0 not checked. [2018-09-10 10:16:33,331 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-10 10:16:33,331 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4nyu Starting monitored process 57 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 57 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-09-10 10:16:33,346 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-09-10 10:16:33,346 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-09-10 10:16:33,486 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 11 check-sat command(s) [2018-09-10 10:16:33,486 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-10 10:16:33,491 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-10 10:16:33,520 INFO L134 CoverageAnalysis]: Checked inductivity of 8049 backedges. 0 proven. 165 refuted. 0 times theorem prover too weak. 7884 trivial. 0 not checked. [2018-09-10 10:16:33,520 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-10 10:16:33,552 INFO L134 CoverageAnalysis]: Checked inductivity of 8049 backedges. 0 proven. 165 refuted. 0 times theorem prover too weak. 7884 trivial. 0 not checked. [2018-09-10 10:16:33,553 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-09-10 10:16:33,554 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [87, 15, 15, 15, 15] total 111 [2018-09-10 10:16:33,554 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-09-10 10:16:33,554 INFO L459 AbstractCegarLoop]: Interpolant automaton has 98 states [2018-09-10 10:16:33,555 INFO L147 InterpolantAutomaton]: Constructing interpolant automaton starting with 98 interpolants. [2018-09-10 10:16:33,555 INFO L148 InterpolantAutomaton]: CoverageRelationStatistics Valid=5681, Invalid=6529, Unknown=0, NotChecked=0, Total=12210 [2018-09-10 10:16:33,555 INFO L87 Difference]: Start difference. First operand 553 states and 626 transitions. Second operand 98 states. [2018-09-10 10:16:36,949 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-10 10:16:36,949 INFO L93 Difference]: Finished difference Result 1035 states and 1141 transitions. [2018-09-10 10:16:36,950 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 98 states. [2018-09-10 10:16:36,950 INFO L78 Accepts]: Start accepts. Automaton has 98 states. Word has length 264 [2018-09-10 10:16:36,951 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-10 10:16:36,955 INFO L225 Difference]: With dead ends: 1035 [2018-09-10 10:16:36,955 INFO L226 Difference]: Without dead ends: 1007 [2018-09-10 10:16:36,956 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 1142 GetRequests, 1032 SyntacticMatches, 0 SemanticMatches, 110 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 383 ImplicationChecksByTransitivity, 4.4s TimeCoverageRelationStatistics Valid=5687, Invalid=6745, Unknown=0, NotChecked=0, Total=12432 [2018-09-10 10:16:36,957 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1007 states. [2018-09-10 10:16:36,965 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1007 to 633. [2018-09-10 10:16:36,965 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 633 states. [2018-09-10 10:16:36,966 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 633 states to 633 states and 717 transitions. [2018-09-10 10:16:36,967 INFO L78 Accepts]: Start accepts. Automaton has 633 states and 717 transitions. Word has length 264 [2018-09-10 10:16:36,967 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-10 10:16:36,967 INFO L480 AbstractCegarLoop]: Abstraction has 633 states and 717 transitions. [2018-09-10 10:16:36,967 INFO L481 AbstractCegarLoop]: Interpolant automaton has 98 states. [2018-09-10 10:16:36,967 INFO L276 IsEmpty]: Start isEmpty. Operand 633 states and 717 transitions. [2018-09-10 10:16:36,970 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 301 [2018-09-10 10:16:36,970 INFO L368 BasicCegarLoop]: Found error trace [2018-09-10 10:16:36,970 INFO L376 BasicCegarLoop]: trace histogram [84, 84, 83, 12, 12, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-09-10 10:16:36,970 INFO L423 AbstractCegarLoop]: === Iteration 32 === [__U_MULTI_f_storage_repos_ultimate_trunk_examples_svcomp_loop_invgen_string_concat_noarr_true_unreach_call_true_termination_i____VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-09-10 10:16:36,970 INFO L82 PathProgramCache]: Analyzing trace with hash 1112549934, now seen corresponding path program 28 times [2018-09-10 10:16:36,971 INFO L69 tionRefinementEngine]: Using refinement strategy RubberTaipanRefinementStrategy [2018-09-10 10:16:36,971 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-10 10:16:36,971 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-10 10:16:36,971 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-10 10:16:36,971 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-09-10 10:16:37,015 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-10 10:16:40,628 INFO L134 CoverageAnalysis]: Checked inductivity of 10656 backedges. 0 proven. 10656 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:16:40,628 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-10 10:16:40,628 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 58 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 58 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-09-10 10:16:40,636 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-09-10 10:16:40,636 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-09-10 10:16:40,729 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-09-10 10:16:40,729 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-10 10:16:40,733 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-10 10:16:40,810 INFO L134 CoverageAnalysis]: Checked inductivity of 10656 backedges. 0 proven. 10656 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:16:40,810 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-10 10:16:51,138 INFO L134 CoverageAnalysis]: Checked inductivity of 10656 backedges. 0 proven. 10656 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:16:51,158 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-10 10:16:51,158 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4nyu Starting monitored process 59 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 59 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-09-10 10:16:51,175 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-09-10 10:16:51,175 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-09-10 10:16:51,362 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-09-10 10:16:51,362 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-10 10:16:51,372 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-10 10:16:51,444 INFO L134 CoverageAnalysis]: Checked inductivity of 10656 backedges. 0 proven. 10656 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:16:51,445 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-10 10:16:51,578 INFO L134 CoverageAnalysis]: Checked inductivity of 10656 backedges. 0 proven. 10656 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:16:51,580 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-09-10 10:16:51,580 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [99, 99, 99, 99, 99] total 196 [2018-09-10 10:16:51,580 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-09-10 10:16:51,581 INFO L459 AbstractCegarLoop]: Interpolant automaton has 99 states [2018-09-10 10:16:51,583 INFO L147 InterpolantAutomaton]: Constructing interpolant automaton starting with 99 interpolants. [2018-09-10 10:16:51,584 INFO L148 InterpolantAutomaton]: CoverageRelationStatistics Valid=18346, Invalid=19874, Unknown=0, NotChecked=0, Total=38220 [2018-09-10 10:16:51,584 INFO L87 Difference]: Start difference. First operand 633 states and 717 transitions. Second operand 99 states. [2018-09-10 10:16:56,279 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-10 10:16:56,279 INFO L93 Difference]: Finished difference Result 921 states and 1017 transitions. [2018-09-10 10:16:56,279 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 99 states. [2018-09-10 10:16:56,280 INFO L78 Accepts]: Start accepts. Automaton has 99 states. Word has length 300 [2018-09-10 10:16:56,280 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-10 10:16:56,284 INFO L225 Difference]: With dead ends: 921 [2018-09-10 10:16:56,284 INFO L226 Difference]: Without dead ends: 915 [2018-09-10 10:16:56,286 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 1298 GetRequests, 1103 SyntacticMatches, 0 SemanticMatches, 195 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 661 ImplicationChecksByTransitivity, 13.7s TimeCoverageRelationStatistics Valid=18352, Invalid=20260, Unknown=0, NotChecked=0, Total=38612 [2018-09-10 10:16:56,286 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 915 states. [2018-09-10 10:16:56,293 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 915 to 640. [2018-09-10 10:16:56,293 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 640 states. [2018-09-10 10:16:56,295 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 640 states to 640 states and 725 transitions. [2018-09-10 10:16:56,295 INFO L78 Accepts]: Start accepts. Automaton has 640 states and 725 transitions. Word has length 300 [2018-09-10 10:16:56,295 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-10 10:16:56,295 INFO L480 AbstractCegarLoop]: Abstraction has 640 states and 725 transitions. [2018-09-10 10:16:56,296 INFO L481 AbstractCegarLoop]: Interpolant automaton has 99 states. [2018-09-10 10:16:56,296 INFO L276 IsEmpty]: Start isEmpty. Operand 640 states and 725 transitions. [2018-09-10 10:16:56,298 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 304 [2018-09-10 10:16:56,298 INFO L368 BasicCegarLoop]: Found error trace [2018-09-10 10:16:56,298 INFO L376 BasicCegarLoop]: trace histogram [85, 85, 84, 12, 12, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-09-10 10:16:56,298 INFO L423 AbstractCegarLoop]: === Iteration 33 === [__U_MULTI_f_storage_repos_ultimate_trunk_examples_svcomp_loop_invgen_string_concat_noarr_true_unreach_call_true_termination_i____VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-09-10 10:16:56,299 INFO L82 PathProgramCache]: Analyzing trace with hash -709031891, now seen corresponding path program 29 times [2018-09-10 10:16:56,299 INFO L69 tionRefinementEngine]: Using refinement strategy RubberTaipanRefinementStrategy [2018-09-10 10:16:56,300 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-10 10:16:56,300 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-10 10:16:56,300 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-10 10:16:56,300 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-09-10 10:16:56,344 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-10 10:17:00,541 INFO L134 CoverageAnalysis]: Checked inductivity of 10908 backedges. 0 proven. 10908 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:17:00,541 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-10 10:17:00,541 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 60 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 60 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-09-10 10:17:00,549 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-09-10 10:17:00,549 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-09-10 10:17:00,750 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 85 check-sat command(s) [2018-09-10 10:17:00,750 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-10 10:17:00,755 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-10 10:17:00,823 INFO L134 CoverageAnalysis]: Checked inductivity of 10908 backedges. 0 proven. 10908 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:17:00,823 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-10 10:17:11,353 INFO L134 CoverageAnalysis]: Checked inductivity of 10908 backedges. 0 proven. 10908 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:17:11,373 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-10 10:17:11,374 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4nyu Starting monitored process 61 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 61 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-09-10 10:17:11,388 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-09-10 10:17:11,389 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-09-10 10:17:13,169 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 85 check-sat command(s) [2018-09-10 10:17:13,169 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-10 10:17:13,180 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-10 10:17:13,250 INFO L134 CoverageAnalysis]: Checked inductivity of 10908 backedges. 0 proven. 10908 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:17:13,250 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-10 10:17:13,320 INFO L134 CoverageAnalysis]: Checked inductivity of 10908 backedges. 0 proven. 10908 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:17:13,321 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-09-10 10:17:13,322 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [100, 100, 100, 100, 100] total 198 [2018-09-10 10:17:13,322 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-09-10 10:17:13,323 INFO L459 AbstractCegarLoop]: Interpolant automaton has 100 states [2018-09-10 10:17:13,324 INFO L147 InterpolantAutomaton]: Constructing interpolant automaton starting with 100 interpolants. [2018-09-10 10:17:13,325 INFO L148 InterpolantAutomaton]: CoverageRelationStatistics Valid=18731, Invalid=20275, Unknown=0, NotChecked=0, Total=39006 [2018-09-10 10:17:13,325 INFO L87 Difference]: Start difference. First operand 640 states and 725 transitions. Second operand 100 states. [2018-09-10 10:17:19,132 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-10 10:17:19,133 INFO L93 Difference]: Finished difference Result 928 states and 1025 transitions. [2018-09-10 10:17:19,133 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 100 states. [2018-09-10 10:17:19,133 INFO L78 Accepts]: Start accepts. Automaton has 100 states. Word has length 303 [2018-09-10 10:17:19,134 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-10 10:17:19,138 INFO L225 Difference]: With dead ends: 928 [2018-09-10 10:17:19,138 INFO L226 Difference]: Without dead ends: 922 [2018-09-10 10:17:19,140 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 1311 GetRequests, 1114 SyntacticMatches, 0 SemanticMatches, 197 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 668 ImplicationChecksByTransitivity, 14.5s TimeCoverageRelationStatistics Valid=18737, Invalid=20665, Unknown=0, NotChecked=0, Total=39402 [2018-09-10 10:17:19,140 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 922 states. [2018-09-10 10:17:19,147 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 922 to 647. [2018-09-10 10:17:19,148 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 647 states. [2018-09-10 10:17:19,149 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 647 states to 647 states and 733 transitions. [2018-09-10 10:17:19,149 INFO L78 Accepts]: Start accepts. Automaton has 647 states and 733 transitions. Word has length 303 [2018-09-10 10:17:19,150 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-10 10:17:19,150 INFO L480 AbstractCegarLoop]: Abstraction has 647 states and 733 transitions. [2018-09-10 10:17:19,150 INFO L481 AbstractCegarLoop]: Interpolant automaton has 100 states. [2018-09-10 10:17:19,150 INFO L276 IsEmpty]: Start isEmpty. Operand 647 states and 733 transitions. [2018-09-10 10:17:19,152 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 307 [2018-09-10 10:17:19,152 INFO L368 BasicCegarLoop]: Found error trace [2018-09-10 10:17:19,153 INFO L376 BasicCegarLoop]: trace histogram [86, 86, 85, 12, 12, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-09-10 10:17:19,153 INFO L423 AbstractCegarLoop]: === Iteration 34 === [__U_MULTI_f_storage_repos_ultimate_trunk_examples_svcomp_loop_invgen_string_concat_noarr_true_unreach_call_true_termination_i____VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-09-10 10:17:19,153 INFO L82 PathProgramCache]: Analyzing trace with hash -541395506, now seen corresponding path program 30 times [2018-09-10 10:17:19,153 INFO L69 tionRefinementEngine]: Using refinement strategy RubberTaipanRefinementStrategy [2018-09-10 10:17:19,154 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-10 10:17:19,154 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-10 10:17:19,154 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-10 10:17:19,154 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-09-10 10:17:19,233 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-10 10:17:23,389 INFO L134 CoverageAnalysis]: Checked inductivity of 11163 backedges. 0 proven. 11163 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:17:23,390 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-10 10:17:23,390 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 62 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 62 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-09-10 10:17:23,397 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-09-10 10:17:23,397 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-09-10 10:17:23,467 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 23 check-sat command(s) [2018-09-10 10:17:23,468 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-10 10:17:23,470 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-10 10:17:24,607 INFO L134 CoverageAnalysis]: Checked inductivity of 11163 backedges. 0 proven. 198 refuted. 0 times theorem prover too weak. 10965 trivial. 0 not checked. [2018-09-10 10:17:24,607 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-10 10:17:25,716 INFO L134 CoverageAnalysis]: Checked inductivity of 11163 backedges. 0 proven. 198 refuted. 0 times theorem prover too weak. 10965 trivial. 0 not checked. [2018-09-10 10:17:25,736 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-10 10:17:25,736 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4nyu Starting monitored process 63 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 63 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-09-10 10:17:25,751 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-09-10 10:17:25,751 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-09-10 10:17:26,066 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 23 check-sat command(s) [2018-09-10 10:17:26,066 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-10 10:17:26,071 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-10 10:17:26,128 INFO L134 CoverageAnalysis]: Checked inductivity of 11163 backedges. 0 proven. 198 refuted. 0 times theorem prover too weak. 10965 trivial. 0 not checked. [2018-09-10 10:17:26,129 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-10 10:17:26,172 INFO L134 CoverageAnalysis]: Checked inductivity of 11163 backedges. 0 proven. 198 refuted. 0 times theorem prover too weak. 10965 trivial. 0 not checked. [2018-09-10 10:17:26,173 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-09-10 10:17:26,174 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [101, 16, 16, 16, 16] total 127 [2018-09-10 10:17:26,174 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-09-10 10:17:26,174 INFO L459 AbstractCegarLoop]: Interpolant automaton has 113 states [2018-09-10 10:17:26,175 INFO L147 InterpolantAutomaton]: Constructing interpolant automaton starting with 113 interpolants. [2018-09-10 10:17:26,175 INFO L148 InterpolantAutomaton]: CoverageRelationStatistics Valid=7513, Invalid=8489, Unknown=0, NotChecked=0, Total=16002 [2018-09-10 10:17:26,175 INFO L87 Difference]: Start difference. First operand 647 states and 733 transitions. Second operand 113 states. [2018-09-10 10:17:30,842 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-10 10:17:30,842 INFO L93 Difference]: Finished difference Result 1208 states and 1330 transitions. [2018-09-10 10:17:30,842 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 113 states. [2018-09-10 10:17:30,842 INFO L78 Accepts]: Start accepts. Automaton has 113 states. Word has length 306 [2018-09-10 10:17:30,843 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-10 10:17:30,848 INFO L225 Difference]: With dead ends: 1208 [2018-09-10 10:17:30,848 INFO L226 Difference]: Without dead ends: 1178 [2018-09-10 10:17:30,849 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 1324 GetRequests, 1198 SyntacticMatches, 0 SemanticMatches, 126 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 444 ImplicationChecksByTransitivity, 6.2s TimeCoverageRelationStatistics Valid=7519, Invalid=8737, Unknown=0, NotChecked=0, Total=16256 [2018-09-10 10:17:30,850 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1178 states. [2018-09-10 10:17:30,858 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1178 to 734. [2018-09-10 10:17:30,859 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 734 states. [2018-09-10 10:17:30,861 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 734 states to 734 states and 832 transitions. [2018-09-10 10:17:30,861 INFO L78 Accepts]: Start accepts. Automaton has 734 states and 832 transitions. Word has length 306 [2018-09-10 10:17:30,861 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-10 10:17:30,861 INFO L480 AbstractCegarLoop]: Abstraction has 734 states and 832 transitions. [2018-09-10 10:17:30,861 INFO L481 AbstractCegarLoop]: Interpolant automaton has 113 states. [2018-09-10 10:17:30,861 INFO L276 IsEmpty]: Start isEmpty. Operand 734 states and 832 transitions. [2018-09-10 10:17:30,864 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 346 [2018-09-10 10:17:30,864 INFO L368 BasicCegarLoop]: Found error trace [2018-09-10 10:17:30,864 INFO L376 BasicCegarLoop]: trace histogram [98, 98, 97, 13, 13, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-09-10 10:17:30,865 INFO L423 AbstractCegarLoop]: === Iteration 35 === [__U_MULTI_f_storage_repos_ultimate_trunk_examples_svcomp_loop_invgen_string_concat_noarr_true_unreach_call_true_termination_i____VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-09-10 10:17:30,865 INFO L82 PathProgramCache]: Analyzing trace with hash -294769805, now seen corresponding path program 31 times [2018-09-10 10:17:30,865 INFO L69 tionRefinementEngine]: Using refinement strategy RubberTaipanRefinementStrategy [2018-09-10 10:17:30,866 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-10 10:17:30,866 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-10 10:17:30,866 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-10 10:17:30,866 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-09-10 10:17:30,927 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-10 10:17:35,631 INFO L134 CoverageAnalysis]: Checked inductivity of 14493 backedges. 0 proven. 14493 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:17:35,632 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-10 10:17:35,632 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 64 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 64 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-09-10 10:17:35,639 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-10 10:17:35,639 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-09-10 10:17:35,734 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-10 10:17:35,739 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-10 10:17:35,825 INFO L134 CoverageAnalysis]: Checked inductivity of 14493 backedges. 0 proven. 14493 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:17:35,826 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-10 10:17:48,153 INFO L134 CoverageAnalysis]: Checked inductivity of 14493 backedges. 0 proven. 14493 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:17:48,173 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-10 10:17:48,173 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4nyu Starting monitored process 65 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 65 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-09-10 10:17:48,190 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-10 10:17:48,190 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-09-10 10:17:48,415 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-10 10:17:48,427 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-10 10:17:48,530 INFO L134 CoverageAnalysis]: Checked inductivity of 14493 backedges. 0 proven. 14493 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:17:48,530 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-10 10:17:50,366 INFO L134 CoverageAnalysis]: Checked inductivity of 14493 backedges. 0 proven. 14493 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:17:50,368 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-09-10 10:17:50,369 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [114, 114, 114, 114, 114] total 206 [2018-09-10 10:17:50,369 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-09-10 10:17:50,370 INFO L459 AbstractCegarLoop]: Interpolant automaton has 114 states [2018-09-10 10:17:50,371 INFO L147 InterpolantAutomaton]: Constructing interpolant automaton starting with 114 interpolants. [2018-09-10 10:17:50,372 INFO L148 InterpolantAutomaton]: CoverageRelationStatistics Valid=20311, Invalid=21919, Unknown=0, NotChecked=0, Total=42230 [2018-09-10 10:17:50,372 INFO L87 Difference]: Start difference. First operand 734 states and 832 transitions. Second operand 114 states. [2018-09-10 10:17:57,446 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-10 10:17:57,446 INFO L93 Difference]: Finished difference Result 867 states and 978 transitions. [2018-09-10 10:17:57,447 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 114 states. [2018-09-10 10:17:57,447 INFO L78 Accepts]: Start accepts. Automaton has 114 states. Word has length 345 [2018-09-10 10:17:57,447 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-10 10:17:57,452 INFO L225 Difference]: With dead ends: 867 [2018-09-10 10:17:57,452 INFO L226 Difference]: Without dead ends: 861 [2018-09-10 10:17:57,453 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 1493 GetRequests, 1248 SyntacticMatches, 40 SemanticMatches, 205 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4686 ImplicationChecksByTransitivity, 18.5s TimeCoverageRelationStatistics Valid=20317, Invalid=22325, Unknown=0, NotChecked=0, Total=42642 [2018-09-10 10:17:57,454 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 861 states. [2018-09-10 10:17:57,459 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 861 to 741. [2018-09-10 10:17:57,459 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 741 states. [2018-09-10 10:17:57,461 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 741 states to 741 states and 840 transitions. [2018-09-10 10:17:57,461 INFO L78 Accepts]: Start accepts. Automaton has 741 states and 840 transitions. Word has length 345 [2018-09-10 10:17:57,462 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-10 10:17:57,462 INFO L480 AbstractCegarLoop]: Abstraction has 741 states and 840 transitions. [2018-09-10 10:17:57,462 INFO L481 AbstractCegarLoop]: Interpolant automaton has 114 states. [2018-09-10 10:17:57,462 INFO L276 IsEmpty]: Start isEmpty. Operand 741 states and 840 transitions. [2018-09-10 10:17:57,465 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 349 [2018-09-10 10:17:57,465 INFO L368 BasicCegarLoop]: Found error trace [2018-09-10 10:17:57,465 INFO L376 BasicCegarLoop]: trace histogram [99, 99, 98, 13, 13, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-09-10 10:17:57,466 INFO L423 AbstractCegarLoop]: === Iteration 36 === [__U_MULTI_f_storage_repos_ultimate_trunk_examples_svcomp_loop_invgen_string_concat_noarr_true_unreach_call_true_termination_i____VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-09-10 10:17:57,466 INFO L82 PathProgramCache]: Analyzing trace with hash -304447532, now seen corresponding path program 32 times [2018-09-10 10:17:57,466 INFO L69 tionRefinementEngine]: Using refinement strategy RubberTaipanRefinementStrategy [2018-09-10 10:17:57,467 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-10 10:17:57,467 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-10 10:17:57,467 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-10 10:17:57,467 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-09-10 10:17:57,531 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-10 10:18:02,640 INFO L134 CoverageAnalysis]: Checked inductivity of 14787 backedges. 0 proven. 14787 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:18:02,640 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-10 10:18:02,641 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 66 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 66 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-09-10 10:18:02,649 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-09-10 10:18:02,649 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-09-10 10:18:02,760 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-09-10 10:18:02,760 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-10 10:18:02,766 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-10 10:18:02,883 INFO L134 CoverageAnalysis]: Checked inductivity of 14787 backedges. 0 proven. 14787 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:18:02,883 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-10 10:18:15,293 INFO L134 CoverageAnalysis]: Checked inductivity of 14787 backedges. 0 proven. 14787 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:18:15,315 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-10 10:18:15,316 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4nyu Starting monitored process 67 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 67 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-09-10 10:18:15,330 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-09-10 10:18:15,330 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-09-10 10:18:15,564 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-09-10 10:18:15,565 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-10 10:18:15,576 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-10 10:18:15,655 INFO L134 CoverageAnalysis]: Checked inductivity of 14787 backedges. 0 proven. 14787 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:18:15,655 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-10 10:18:17,301 INFO L134 CoverageAnalysis]: Checked inductivity of 14787 backedges. 0 proven. 14787 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:18:17,302 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-09-10 10:18:17,303 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [115, 115, 115, 115, 115] total 206 [2018-09-10 10:18:17,303 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-09-10 10:18:17,304 INFO L459 AbstractCegarLoop]: Interpolant automaton has 115 states [2018-09-10 10:18:17,305 INFO L147 InterpolantAutomaton]: Constructing interpolant automaton starting with 115 interpolants. [2018-09-10 10:18:17,305 INFO L148 InterpolantAutomaton]: CoverageRelationStatistics Valid=20311, Invalid=21919, Unknown=0, NotChecked=0, Total=42230 [2018-09-10 10:18:17,306 INFO L87 Difference]: Start difference. First operand 741 states and 840 transitions. Second operand 115 states. [2018-09-10 10:18:25,786 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-10 10:18:25,786 INFO L93 Difference]: Finished difference Result 838 states and 950 transitions. [2018-09-10 10:18:25,787 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 115 states. [2018-09-10 10:18:25,787 INFO L78 Accepts]: Start accepts. Automaton has 115 states. Word has length 348 [2018-09-10 10:18:25,788 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-10 10:18:25,792 INFO L225 Difference]: With dead ends: 838 [2018-09-10 10:18:25,792 INFO L226 Difference]: Without dead ends: 832 [2018-09-10 10:18:25,793 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 1506 GetRequests, 1257 SyntacticMatches, 44 SemanticMatches, 205 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5085 ImplicationChecksByTransitivity, 18.8s TimeCoverageRelationStatistics Valid=20317, Invalid=22325, Unknown=0, NotChecked=0, Total=42642 [2018-09-10 10:18:25,794 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 832 states. [2018-09-10 10:18:25,801 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 832 to 748. [2018-09-10 10:18:25,801 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 748 states. [2018-09-10 10:18:25,803 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 748 states to 748 states and 848 transitions. [2018-09-10 10:18:25,803 INFO L78 Accepts]: Start accepts. Automaton has 748 states and 848 transitions. Word has length 348 [2018-09-10 10:18:25,804 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-10 10:18:25,804 INFO L480 AbstractCegarLoop]: Abstraction has 748 states and 848 transitions. [2018-09-10 10:18:25,804 INFO L481 AbstractCegarLoop]: Interpolant automaton has 115 states. [2018-09-10 10:18:25,804 INFO L276 IsEmpty]: Start isEmpty. Operand 748 states and 848 transitions. [2018-09-10 10:18:25,807 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 352 [2018-09-10 10:18:25,807 INFO L368 BasicCegarLoop]: Found error trace [2018-09-10 10:18:25,807 INFO L376 BasicCegarLoop]: trace histogram [100, 100, 99, 13, 13, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-09-10 10:18:25,807 INFO L423 AbstractCegarLoop]: === Iteration 37 === [__U_MULTI_f_storage_repos_ultimate_trunk_examples_svcomp_loop_invgen_string_concat_noarr_true_unreach_call_true_termination_i____VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-09-10 10:18:25,808 INFO L82 PathProgramCache]: Analyzing trace with hash -850803757, now seen corresponding path program 33 times [2018-09-10 10:18:25,808 INFO L69 tionRefinementEngine]: Using refinement strategy RubberTaipanRefinementStrategy [2018-09-10 10:18:25,808 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-10 10:18:25,808 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-10 10:18:25,809 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-10 10:18:25,809 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-09-10 10:18:25,870 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat Received shutdown request... [2018-09-10 10:18:26,576 WARN L549 AbstractCegarLoop]: Verification canceled [2018-09-10 10:18:26,581 WARN L206 ceAbstractionStarter]: Timeout [2018-09-10 10:18:26,582 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 10.09 10:18:26 BoogieIcfgContainer [2018-09-10 10:18:26,582 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2018-09-10 10:18:26,582 INFO L168 Benchmark]: Toolchain (without parser) took 243737.69 ms. Allocated memory was 1.5 GB in the beginning and 2.3 GB in the end (delta: 746.6 MB). Free memory was 1.4 GB in the beginning and 2.1 GB in the end (delta: -706.0 MB). Peak memory consumption was 40.6 MB. Max. memory is 7.1 GB. [2018-09-10 10:18:26,584 INFO L168 Benchmark]: CDTParser took 0.19 ms. Allocated memory is still 1.5 GB. Free memory is still 1.5 GB. There was no memory consumed. Max. memory is 7.1 GB. [2018-09-10 10:18:26,584 INFO L168 Benchmark]: CACSL2BoogieTranslator took 278.90 ms. Allocated memory is still 1.5 GB. Free memory was 1.4 GB in the beginning and 1.4 GB in the end (delta: 10.6 MB). Peak memory consumption was 10.6 MB. Max. memory is 7.1 GB. [2018-09-10 10:18:26,585 INFO L168 Benchmark]: Boogie Procedure Inliner took 24.42 ms. Allocated memory is still 1.5 GB. Free memory is still 1.4 GB. There was no memory consumed. Max. memory is 7.1 GB. [2018-09-10 10:18:26,585 INFO L168 Benchmark]: Boogie Preprocessor took 25.56 ms. Allocated memory is still 1.5 GB. Free memory is still 1.4 GB. There was no memory consumed. Max. memory is 7.1 GB. [2018-09-10 10:18:26,586 INFO L168 Benchmark]: RCFGBuilder took 398.85 ms. Allocated memory was 1.5 GB in the beginning and 2.3 GB in the end (delta: 735.1 MB). Free memory was 1.4 GB in the beginning and 2.2 GB in the end (delta: -784.1 MB). Peak memory consumption was 26.6 MB. Max. memory is 7.1 GB. [2018-09-10 10:18:26,586 INFO L168 Benchmark]: TraceAbstraction took 242999.99 ms. Allocated memory was 2.3 GB in the beginning and 2.3 GB in the end (delta: 11.5 MB). Free memory was 2.2 GB in the beginning and 2.1 GB in the end (delta: 67.6 MB). Peak memory consumption was 79.1 MB. Max. memory is 7.1 GB. [2018-09-10 10:18:26,590 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.19 ms. Allocated memory is still 1.5 GB. Free memory is still 1.5 GB. There was no memory consumed. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 278.90 ms. Allocated memory is still 1.5 GB. Free memory was 1.4 GB in the beginning and 1.4 GB in the end (delta: 10.6 MB). Peak memory consumption was 10.6 MB. Max. memory is 7.1 GB. * Boogie Procedure Inliner took 24.42 ms. Allocated memory is still 1.5 GB. Free memory is still 1.4 GB. There was no memory consumed. Max. memory is 7.1 GB. * Boogie Preprocessor took 25.56 ms. Allocated memory is still 1.5 GB. Free memory is still 1.4 GB. There was no memory consumed. Max. memory is 7.1 GB. * RCFGBuilder took 398.85 ms. Allocated memory was 1.5 GB in the beginning and 2.3 GB in the end (delta: 735.1 MB). Free memory was 1.4 GB in the beginning and 2.2 GB in the end (delta: -784.1 MB). Peak memory consumption was 26.6 MB. Max. memory is 7.1 GB. * TraceAbstraction took 242999.99 ms. Allocated memory was 2.3 GB in the beginning and 2.3 GB in the end (delta: 11.5 MB). Free memory was 2.2 GB in the beginning and 2.1 GB in the end (delta: 67.6 MB). Peak memory consumption was 79.1 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - TimeoutResultAtElement [Line: 5]: Timeout (TraceAbstraction) Unable to prove that call of __VERIFIER_error() unreachable (line 5). Cancelled while BasicCegarLoop was analyzing trace of length 352 with TraceHistMax 100, while InterpolatingTraceCheckCraig was constructing Craig interpolants, while PredicateComparison was comparing new predicate (quantifier-free) to 29 known predicates. - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 27 locations, 1 error locations. TIMEOUT Result, 242.9s OverallTime, 37 OverallIterations, 100 TraceHistogramMax, 63.9s AutomataDifference, 0.0s DeadEndRemovalTime, 0.0s HoareAnnotationTime, HoareTripleCheckerStatistics: 519 SDtfs, 14017 SDslu, 14275 SDs, 0 SdLazy, 9889 SolverSat, 4652 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 23.0s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 22542 GetRequests, 19489 SyntacticMatches, 84 SemanticMatches, 2969 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18110 ImplicationChecksByTransitivity, 158.9s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=748occurred in iteration=36, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s AbstIntTime, 0 AbstIntIterations, 0 AbstIntStrong, NaN AbsIntWeakeningRatio, NaN AbsIntAvgWeakeningVarsNumRemoved, NaN AbsIntAvgWeakenedConjuncts, 0.0s DumpTime, AutomataMinimizationStatistics: 0.2s AutomataMinimizationTime, 36 MinimizatonAttempts, 4855 StatesRemovedByMinimization, 34 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TraceCheckStatistics: 0.7s SsaConstructionTime, 8.7s SatisfiabilityAnalysisTime, 165.5s InterpolantComputationTime, 15695 NumberOfCodeBlocks, 13985 NumberOfCodeBlocksAsserted, 744 NumberOfCheckSat, 25955 ConstructedInterpolants, 0 QuantifiedInterpolants, 14688867 SizeOfPredicates, 153 NumberOfNonLiveVariables, 20694 ConjunctsInSsa, 2772 ConjunctsInUnsatCore, 168 InterpolantComputations, 3 PerfectInterpolantSequences, 132135/637563 InterpolantCoveringCapability, InvariantSynthesisStatistics: No data available, InterpolantConsolidationStatistics: No data available, ReuseStatistics: No data available RESULT: Ultimate could not prove your program: Timeout Written .csv to /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/csv/string_concat-noarr_true-unreach-call_true-termination.i_svcomp-Reach-64bit-RubberTaipan_Default-OldIcfg.epf_AutomizerCInline.xml/Csv-Benchmark-0-2018-09-10_10-18-26-601.csv Written .csv to /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/csv/string_concat-noarr_true-unreach-call_true-termination.i_svcomp-Reach-64bit-RubberTaipan_Default-OldIcfg.epf_AutomizerCInline.xml/Csv-TraceAbstractionBenchmarks-0-2018-09-10_10-18-26-601.csv Completed graceful shutdown