java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loop-acceleration/array_3-2.i -------------------------------------------------------------------------------- This is Ultimate 0.1.24-13a467a-m [2019-10-14 23:14:01,111 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-10-14 23:14:01,114 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-10-14 23:14:01,133 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2019-10-14 23:14:01,133 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2019-10-14 23:14:01,135 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2019-10-14 23:14:01,137 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2019-10-14 23:14:01,146 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2019-10-14 23:14:01,150 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2019-10-14 23:14:01,153 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2019-10-14 23:14:01,155 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2019-10-14 23:14:01,157 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2019-10-14 23:14:01,157 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-10-14 23:14:01,159 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-10-14 23:14:01,161 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-10-14 23:14:01,162 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-10-14 23:14:01,164 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-10-14 23:14:01,164 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-10-14 23:14:01,166 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-10-14 23:14:01,171 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-10-14 23:14:01,177 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-10-14 23:14:01,180 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-10-14 23:14:01,184 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-10-14 23:14:01,185 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-10-14 23:14:01,187 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2019-10-14 23:14:01,192 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2019-10-14 23:14:01,193 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2019-10-14 23:14:01,193 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2019-10-14 23:14:01,194 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2019-10-14 23:14:01,195 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2019-10-14 23:14:01,196 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2019-10-14 23:14:01,196 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2019-10-14 23:14:01,197 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2019-10-14 23:14:01,197 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-10-14 23:14:01,197 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-10-14 23:14:01,199 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-10-14 23:14:01,200 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2019-10-14 23:14:01,230 INFO L113 SettingsManager]: Loading preferences was successful [2019-10-14 23:14:01,230 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-10-14 23:14:01,234 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2019-10-14 23:14:01,234 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2019-10-14 23:14:01,234 INFO L138 SettingsManager]: * Use SBE=true [2019-10-14 23:14:01,235 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-10-14 23:14:01,235 INFO L138 SettingsManager]: * sizeof long=4 [2019-10-14 23:14:01,236 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2019-10-14 23:14:01,236 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-10-14 23:14:01,236 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-10-14 23:14:01,237 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-10-14 23:14:01,238 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-10-14 23:14:01,238 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-10-14 23:14:01,238 INFO L138 SettingsManager]: * sizeof long double=12 [2019-10-14 23:14:01,238 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-10-14 23:14:01,239 INFO L138 SettingsManager]: * Use constant arrays=true [2019-10-14 23:14:01,239 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-10-14 23:14:01,239 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-10-14 23:14:01,239 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-10-14 23:14:01,239 INFO L138 SettingsManager]: * To the following directory=./dump/ [2019-10-14 23:14:01,240 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2019-10-14 23:14:01,240 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-10-14 23:14:01,240 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-10-14 23:14:01,240 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-10-14 23:14:01,241 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-10-14 23:14:01,241 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2019-10-14 23:14:01,241 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-10-14 23:14:01,241 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-10-14 23:14:01,241 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2019-10-14 23:14:01,547 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-10-14 23:14:01,560 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-10-14 23:14:01,564 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-10-14 23:14:01,565 INFO L271 PluginConnector]: Initializing CDTParser... [2019-10-14 23:14:01,566 INFO L275 PluginConnector]: CDTParser initialized [2019-10-14 23:14:01,567 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-acceleration/array_3-2.i [2019-10-14 23:14:01,646 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/c958f6acf/0a4ec7b62f4f4926a513101a393766ba/FLAG8cd9d572a [2019-10-14 23:14:02,136 INFO L306 CDTParser]: Found 1 translation units. [2019-10-14 23:14:02,136 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-acceleration/array_3-2.i [2019-10-14 23:14:02,143 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/c958f6acf/0a4ec7b62f4f4926a513101a393766ba/FLAG8cd9d572a [2019-10-14 23:14:02,505 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/c958f6acf/0a4ec7b62f4f4926a513101a393766ba [2019-10-14 23:14:02,514 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-10-14 23:14:02,516 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2019-10-14 23:14:02,517 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-10-14 23:14:02,517 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-10-14 23:14:02,520 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-10-14 23:14:02,521 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 14.10 11:14:02" (1/1) ... [2019-10-14 23:14:02,524 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@3cf983e9 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 11:14:02, skipping insertion in model container [2019-10-14 23:14:02,524 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 14.10 11:14:02" (1/1) ... [2019-10-14 23:14:02,532 INFO L142 MainTranslator]: Starting translation in SV-COMP mode [2019-10-14 23:14:02,547 INFO L173 MainTranslator]: Built tables and reachable declarations [2019-10-14 23:14:02,712 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-10-14 23:14:02,723 INFO L188 MainTranslator]: Completed pre-run [2019-10-14 23:14:02,745 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-10-14 23:14:02,764 INFO L192 MainTranslator]: Completed translation [2019-10-14 23:14:02,765 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 11:14:02 WrapperNode [2019-10-14 23:14:02,765 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-10-14 23:14:02,766 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-10-14 23:14:02,766 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-10-14 23:14:02,766 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-10-14 23:14:02,872 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 11:14:02" (1/1) ... [2019-10-14 23:14:02,872 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 11:14:02" (1/1) ... [2019-10-14 23:14:02,880 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 11:14:02" (1/1) ... [2019-10-14 23:14:02,881 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 11:14:02" (1/1) ... [2019-10-14 23:14:02,890 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 11:14:02" (1/1) ... [2019-10-14 23:14:02,896 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 11:14:02" (1/1) ... [2019-10-14 23:14:02,897 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 11:14:02" (1/1) ... [2019-10-14 23:14:02,899 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-10-14 23:14:02,899 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-10-14 23:14:02,899 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-10-14 23:14:02,900 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-10-14 23:14:02,900 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 11:14:02" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-10-14 23:14:02,959 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2019-10-14 23:14:02,959 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-10-14 23:14:02,960 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2019-10-14 23:14:02,960 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2019-10-14 23:14:02,960 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2019-10-14 23:14:02,960 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2019-10-14 23:14:02,960 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2019-10-14 23:14:02,960 INFO L130 BoogieDeclarations]: Found specification of procedure main [2019-10-14 23:14:02,961 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2019-10-14 23:14:02,961 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2019-10-14 23:14:02,961 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2019-10-14 23:14:02,961 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2019-10-14 23:14:02,961 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2019-10-14 23:14:02,961 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-10-14 23:14:03,187 INFO L279 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-10-14 23:14:03,187 INFO L284 CfgBuilder]: Removed 2 assume(true) statements. [2019-10-14 23:14:03,189 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 14.10 11:14:03 BoogieIcfgContainer [2019-10-14 23:14:03,190 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-10-14 23:14:03,201 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-10-14 23:14:03,202 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-10-14 23:14:03,211 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-10-14 23:14:03,211 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 14.10 11:14:02" (1/3) ... [2019-10-14 23:14:03,213 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3e984379 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 14.10 11:14:03, skipping insertion in model container [2019-10-14 23:14:03,213 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 11:14:02" (2/3) ... [2019-10-14 23:14:03,214 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3e984379 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 14.10 11:14:03, skipping insertion in model container [2019-10-14 23:14:03,214 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 14.10 11:14:03" (3/3) ... [2019-10-14 23:14:03,217 INFO L109 eAbstractionObserver]: Analyzing ICFG array_3-2.i [2019-10-14 23:14:03,232 INFO L152 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-10-14 23:14:03,262 INFO L164 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-10-14 23:14:03,285 INFO L249 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-10-14 23:14:03,328 INFO L373 AbstractCegarLoop]: Interprodecural is true [2019-10-14 23:14:03,329 INFO L374 AbstractCegarLoop]: Hoare is true [2019-10-14 23:14:03,329 INFO L375 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-10-14 23:14:03,329 INFO L376 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-10-14 23:14:03,329 INFO L377 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-10-14 23:14:03,329 INFO L378 AbstractCegarLoop]: Difference is false [2019-10-14 23:14:03,329 INFO L379 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-10-14 23:14:03,329 INFO L383 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-10-14 23:14:03,344 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states. [2019-10-14 23:14:03,349 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2019-10-14 23:14:03,350 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 23:14:03,351 INFO L380 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 23:14:03,352 INFO L410 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 23:14:03,358 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 23:14:03,359 INFO L82 PathProgramCache]: Analyzing trace with hash 1584649929, now seen corresponding path program 1 times [2019-10-14 23:14:03,368 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 23:14:03,369 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [752314259] [2019-10-14 23:14:03,369 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:14:03,369 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:14:03,369 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 23:14:03,450 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:14:03,518 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:14:03,525 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 23:14:03,526 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [752314259] [2019-10-14 23:14:03,527 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-10-14 23:14:03,527 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2019-10-14 23:14:03,527 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [717464664] [2019-10-14 23:14:03,531 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-10-14 23:14:03,531 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 23:14:03,542 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-10-14 23:14:03,542 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-10-14 23:14:03,545 INFO L87 Difference]: Start difference. First operand 25 states. Second operand 3 states. [2019-10-14 23:14:03,641 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 23:14:03,642 INFO L93 Difference]: Finished difference Result 42 states and 51 transitions. [2019-10-14 23:14:03,642 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-10-14 23:14:03,643 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 13 [2019-10-14 23:14:03,644 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 23:14:03,656 INFO L225 Difference]: With dead ends: 42 [2019-10-14 23:14:03,656 INFO L226 Difference]: Without dead ends: 18 [2019-10-14 23:14:03,663 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-10-14 23:14:03,682 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2019-10-14 23:14:03,697 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2019-10-14 23:14:03,698 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2019-10-14 23:14:03,699 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 20 transitions. [2019-10-14 23:14:03,700 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 20 transitions. Word has length 13 [2019-10-14 23:14:03,701 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 23:14:03,701 INFO L462 AbstractCegarLoop]: Abstraction has 18 states and 20 transitions. [2019-10-14 23:14:03,701 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-10-14 23:14:03,701 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 20 transitions. [2019-10-14 23:14:03,702 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2019-10-14 23:14:03,702 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 23:14:03,702 INFO L380 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 23:14:03,703 INFO L410 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 23:14:03,703 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 23:14:03,703 INFO L82 PathProgramCache]: Analyzing trace with hash -963606854, now seen corresponding path program 1 times [2019-10-14 23:14:03,703 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 23:14:03,704 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1046326557] [2019-10-14 23:14:03,704 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:14:03,704 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:14:03,704 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 23:14:03,724 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:14:03,777 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:14:03,789 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 23:14:03,789 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1046326557] [2019-10-14 23:14:03,789 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-10-14 23:14:03,790 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2019-10-14 23:14:03,790 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1283568447] [2019-10-14 23:14:03,791 INFO L442 AbstractCegarLoop]: Interpolant automaton has 4 states [2019-10-14 23:14:03,792 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 23:14:03,792 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2019-10-14 23:14:03,792 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2019-10-14 23:14:03,793 INFO L87 Difference]: Start difference. First operand 18 states and 20 transitions. Second operand 4 states. [2019-10-14 23:14:03,859 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 23:14:03,859 INFO L93 Difference]: Finished difference Result 35 states and 41 transitions. [2019-10-14 23:14:03,860 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2019-10-14 23:14:03,860 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 15 [2019-10-14 23:14:03,861 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 23:14:03,863 INFO L225 Difference]: With dead ends: 35 [2019-10-14 23:14:03,863 INFO L226 Difference]: Without dead ends: 25 [2019-10-14 23:14:03,864 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2019-10-14 23:14:03,865 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2019-10-14 23:14:03,870 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 19. [2019-10-14 23:14:03,871 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2019-10-14 23:14:03,871 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 21 transitions. [2019-10-14 23:14:03,872 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 21 transitions. Word has length 15 [2019-10-14 23:14:03,872 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 23:14:03,872 INFO L462 AbstractCegarLoop]: Abstraction has 19 states and 21 transitions. [2019-10-14 23:14:03,872 INFO L463 AbstractCegarLoop]: Interpolant automaton has 4 states. [2019-10-14 23:14:03,873 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 21 transitions. [2019-10-14 23:14:03,873 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2019-10-14 23:14:03,873 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 23:14:03,874 INFO L380 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 23:14:03,874 INFO L410 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 23:14:03,874 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 23:14:03,874 INFO L82 PathProgramCache]: Analyzing trace with hash -544788776, now seen corresponding path program 1 times [2019-10-14 23:14:03,875 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 23:14:03,875 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [371429841] [2019-10-14 23:14:03,875 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:14:03,875 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:14:03,876 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 23:14:03,906 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:14:03,983 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:14:03,988 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-10-14 23:14:03,989 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [371429841] [2019-10-14 23:14:03,989 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-10-14 23:14:03,989 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2019-10-14 23:14:03,989 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1696152396] [2019-10-14 23:14:03,990 INFO L442 AbstractCegarLoop]: Interpolant automaton has 6 states [2019-10-14 23:14:03,990 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 23:14:03,990 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2019-10-14 23:14:03,991 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2019-10-14 23:14:03,991 INFO L87 Difference]: Start difference. First operand 19 states and 21 transitions. Second operand 6 states. [2019-10-14 23:14:04,127 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 23:14:04,127 INFO L93 Difference]: Finished difference Result 29 states and 32 transitions. [2019-10-14 23:14:04,128 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2019-10-14 23:14:04,129 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 17 [2019-10-14 23:14:04,129 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 23:14:04,130 INFO L225 Difference]: With dead ends: 29 [2019-10-14 23:14:04,130 INFO L226 Difference]: Without dead ends: 24 [2019-10-14 23:14:04,131 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=19, Invalid=37, Unknown=0, NotChecked=0, Total=56 [2019-10-14 23:14:04,131 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2019-10-14 23:14:04,136 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 22. [2019-10-14 23:14:04,137 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2019-10-14 23:14:04,140 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 25 transitions. [2019-10-14 23:14:04,141 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 25 transitions. Word has length 17 [2019-10-14 23:14:04,142 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 23:14:04,142 INFO L462 AbstractCegarLoop]: Abstraction has 22 states and 25 transitions. [2019-10-14 23:14:04,142 INFO L463 AbstractCegarLoop]: Interpolant automaton has 6 states. [2019-10-14 23:14:04,142 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 25 transitions. [2019-10-14 23:14:04,144 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2019-10-14 23:14:04,144 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 23:14:04,144 INFO L380 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 23:14:04,145 INFO L410 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 23:14:04,145 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 23:14:04,145 INFO L82 PathProgramCache]: Analyzing trace with hash 1315898579, now seen corresponding path program 1 times [2019-10-14 23:14:04,146 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 23:14:04,146 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [711652800] [2019-10-14 23:14:04,146 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:14:04,146 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:14:04,147 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 23:14:04,185 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:14:04,279 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:14:04,287 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-10-14 23:14:04,288 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [711652800] [2019-10-14 23:14:04,289 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [899312100] [2019-10-14 23:14:04,289 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 23:14:04,368 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:14:04,370 INFO L256 TraceCheckSpWp]: Trace formula consists of 69 conjuncts, 3 conjunts are in the unsatisfiable core [2019-10-14 23:14:04,378 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 23:14:04,427 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2019-10-14 23:14:04,427 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 23:14:04,427 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 4] total 8 [2019-10-14 23:14:04,428 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [185656511] [2019-10-14 23:14:04,428 INFO L442 AbstractCegarLoop]: Interpolant automaton has 8 states [2019-10-14 23:14:04,428 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 23:14:04,429 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2019-10-14 23:14:04,429 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=40, Unknown=0, NotChecked=0, Total=56 [2019-10-14 23:14:04,429 INFO L87 Difference]: Start difference. First operand 22 states and 25 transitions. Second operand 8 states. [2019-10-14 23:14:04,565 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 23:14:04,565 INFO L93 Difference]: Finished difference Result 46 states and 54 transitions. [2019-10-14 23:14:04,566 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2019-10-14 23:14:04,566 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 21 [2019-10-14 23:14:04,566 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 23:14:04,567 INFO L225 Difference]: With dead ends: 46 [2019-10-14 23:14:04,567 INFO L226 Difference]: Without dead ends: 30 [2019-10-14 23:14:04,568 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 22 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=26, Invalid=64, Unknown=0, NotChecked=0, Total=90 [2019-10-14 23:14:04,568 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2019-10-14 23:14:04,573 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 28. [2019-10-14 23:14:04,573 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2019-10-14 23:14:04,574 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 32 transitions. [2019-10-14 23:14:04,574 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 32 transitions. Word has length 21 [2019-10-14 23:14:04,574 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 23:14:04,574 INFO L462 AbstractCegarLoop]: Abstraction has 28 states and 32 transitions. [2019-10-14 23:14:04,574 INFO L463 AbstractCegarLoop]: Interpolant automaton has 8 states. [2019-10-14 23:14:04,575 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 32 transitions. [2019-10-14 23:14:04,575 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2019-10-14 23:14:04,576 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 23:14:04,576 INFO L380 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 23:14:04,781 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 23:14:04,781 INFO L410 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 23:14:04,781 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 23:14:04,782 INFO L82 PathProgramCache]: Analyzing trace with hash 516358124, now seen corresponding path program 2 times [2019-10-14 23:14:04,782 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 23:14:04,782 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1508884436] [2019-10-14 23:14:04,782 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:14:04,783 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:14:04,783 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 23:14:04,824 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:14:04,920 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:14:04,926 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2019-10-14 23:14:04,927 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1508884436] [2019-10-14 23:14:04,927 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [419719963] [2019-10-14 23:14:04,928 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 23:14:04,994 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-10-14 23:14:04,994 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 23:14:04,995 INFO L256 TraceCheckSpWp]: Trace formula consists of 83 conjuncts, 4 conjunts are in the unsatisfiable core [2019-10-14 23:14:04,997 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 23:14:05,020 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2019-10-14 23:14:05,020 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 23:14:05,021 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 5] total 9 [2019-10-14 23:14:05,021 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1930748173] [2019-10-14 23:14:05,021 INFO L442 AbstractCegarLoop]: Interpolant automaton has 9 states [2019-10-14 23:14:05,022 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 23:14:05,022 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2019-10-14 23:14:05,026 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=51, Unknown=0, NotChecked=0, Total=72 [2019-10-14 23:14:05,026 INFO L87 Difference]: Start difference. First operand 28 states and 32 transitions. Second operand 9 states. [2019-10-14 23:14:05,189 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 23:14:05,189 INFO L93 Difference]: Finished difference Result 56 states and 66 transitions. [2019-10-14 23:14:05,190 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2019-10-14 23:14:05,190 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 27 [2019-10-14 23:14:05,191 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 23:14:05,192 INFO L225 Difference]: With dead ends: 56 [2019-10-14 23:14:05,193 INFO L226 Difference]: Without dead ends: 36 [2019-10-14 23:14:05,193 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 28 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=31, Invalid=79, Unknown=0, NotChecked=0, Total=110 [2019-10-14 23:14:05,194 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2019-10-14 23:14:05,201 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 34. [2019-10-14 23:14:05,201 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2019-10-14 23:14:05,203 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 39 transitions. [2019-10-14 23:14:05,204 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 39 transitions. Word has length 27 [2019-10-14 23:14:05,204 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 23:14:05,204 INFO L462 AbstractCegarLoop]: Abstraction has 34 states and 39 transitions. [2019-10-14 23:14:05,204 INFO L463 AbstractCegarLoop]: Interpolant automaton has 9 states. [2019-10-14 23:14:05,204 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 39 transitions. [2019-10-14 23:14:05,207 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2019-10-14 23:14:05,207 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 23:14:05,207 INFO L380 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 23:14:05,415 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 23:14:05,416 INFO L410 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 23:14:05,416 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 23:14:05,416 INFO L82 PathProgramCache]: Analyzing trace with hash -1291397115, now seen corresponding path program 3 times [2019-10-14 23:14:05,416 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 23:14:05,417 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1252825298] [2019-10-14 23:14:05,417 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:14:05,417 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:14:05,417 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 23:14:05,447 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:14:05,547 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:14:05,555 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2019-10-14 23:14:05,555 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1252825298] [2019-10-14 23:14:05,555 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1637434398] [2019-10-14 23:14:05,556 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 23:14:05,607 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2019-10-14 23:14:05,608 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 23:14:05,609 INFO L256 TraceCheckSpWp]: Trace formula consists of 97 conjuncts, 5 conjunts are in the unsatisfiable core [2019-10-14 23:14:05,611 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 23:14:05,633 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2019-10-14 23:14:05,633 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 23:14:05,633 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 6] total 10 [2019-10-14 23:14:05,634 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [934029388] [2019-10-14 23:14:05,634 INFO L442 AbstractCegarLoop]: Interpolant automaton has 10 states [2019-10-14 23:14:05,635 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 23:14:05,635 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2019-10-14 23:14:05,635 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=63, Unknown=0, NotChecked=0, Total=90 [2019-10-14 23:14:05,635 INFO L87 Difference]: Start difference. First operand 34 states and 39 transitions. Second operand 10 states. [2019-10-14 23:14:05,816 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 23:14:05,817 INFO L93 Difference]: Finished difference Result 66 states and 78 transitions. [2019-10-14 23:14:05,817 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2019-10-14 23:14:05,818 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 33 [2019-10-14 23:14:05,818 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 23:14:05,819 INFO L225 Difference]: With dead ends: 66 [2019-10-14 23:14:05,819 INFO L226 Difference]: Without dead ends: 42 [2019-10-14 23:14:05,820 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 34 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=37, Invalid=95, Unknown=0, NotChecked=0, Total=132 [2019-10-14 23:14:05,820 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2019-10-14 23:14:05,829 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 40. [2019-10-14 23:14:05,830 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2019-10-14 23:14:05,832 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 46 transitions. [2019-10-14 23:14:05,833 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 46 transitions. Word has length 33 [2019-10-14 23:14:05,833 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 23:14:05,833 INFO L462 AbstractCegarLoop]: Abstraction has 40 states and 46 transitions. [2019-10-14 23:14:05,833 INFO L463 AbstractCegarLoop]: Interpolant automaton has 10 states. [2019-10-14 23:14:05,834 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 46 transitions. [2019-10-14 23:14:05,837 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2019-10-14 23:14:05,838 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 23:14:05,838 INFO L380 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 23:14:06,050 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 23:14:06,050 INFO L410 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 23:14:06,050 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 23:14:06,051 INFO L82 PathProgramCache]: Analyzing trace with hash 893709598, now seen corresponding path program 4 times [2019-10-14 23:14:06,051 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 23:14:06,051 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2067738524] [2019-10-14 23:14:06,051 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:14:06,052 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:14:06,052 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 23:14:06,074 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:14:06,179 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:14:06,187 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2019-10-14 23:14:06,189 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2067738524] [2019-10-14 23:14:06,189 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [97312136] [2019-10-14 23:14:06,189 INFO L92 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 23:14:06,252 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-10-14 23:14:06,252 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 23:14:06,253 INFO L256 TraceCheckSpWp]: Trace formula consists of 111 conjuncts, 6 conjunts are in the unsatisfiable core [2019-10-14 23:14:06,259 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 23:14:06,283 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2019-10-14 23:14:06,283 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 23:14:06,283 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 7] total 11 [2019-10-14 23:14:06,284 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [709190831] [2019-10-14 23:14:06,284 INFO L442 AbstractCegarLoop]: Interpolant automaton has 11 states [2019-10-14 23:14:06,284 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 23:14:06,285 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2019-10-14 23:14:06,285 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=76, Unknown=0, NotChecked=0, Total=110 [2019-10-14 23:14:06,286 INFO L87 Difference]: Start difference. First operand 40 states and 46 transitions. Second operand 11 states. [2019-10-14 23:14:06,426 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 23:14:06,427 INFO L93 Difference]: Finished difference Result 76 states and 90 transitions. [2019-10-14 23:14:06,428 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2019-10-14 23:14:06,428 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 39 [2019-10-14 23:14:06,428 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 23:14:06,429 INFO L225 Difference]: With dead ends: 76 [2019-10-14 23:14:06,429 INFO L226 Difference]: Without dead ends: 48 [2019-10-14 23:14:06,430 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 51 GetRequests, 40 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=44, Invalid=112, Unknown=0, NotChecked=0, Total=156 [2019-10-14 23:14:06,430 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2019-10-14 23:14:06,440 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 46. [2019-10-14 23:14:06,442 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2019-10-14 23:14:06,443 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 53 transitions. [2019-10-14 23:14:06,443 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 53 transitions. Word has length 39 [2019-10-14 23:14:06,443 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 23:14:06,443 INFO L462 AbstractCegarLoop]: Abstraction has 46 states and 53 transitions. [2019-10-14 23:14:06,444 INFO L463 AbstractCegarLoop]: Interpolant automaton has 11 states. [2019-10-14 23:14:06,444 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 53 transitions. [2019-10-14 23:14:06,445 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2019-10-14 23:14:06,445 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 23:14:06,446 INFO L380 BasicCegarLoop]: trace histogram [6, 6, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 23:14:06,646 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 23:14:06,647 INFO L410 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 23:14:06,647 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 23:14:06,647 INFO L82 PathProgramCache]: Analyzing trace with hash -398483657, now seen corresponding path program 5 times [2019-10-14 23:14:06,647 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 23:14:06,647 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1380125921] [2019-10-14 23:14:06,648 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:14:06,648 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:14:06,648 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 23:14:06,673 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:14:06,781 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:14:06,785 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2019-10-14 23:14:06,785 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1380125921] [2019-10-14 23:14:06,785 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [961086417] [2019-10-14 23:14:06,785 INFO L92 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 23:14:06,858 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2019-10-14 23:14:06,859 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 23:14:06,860 INFO L256 TraceCheckSpWp]: Trace formula consists of 125 conjuncts, 7 conjunts are in the unsatisfiable core [2019-10-14 23:14:06,864 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 23:14:06,879 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2019-10-14 23:14:06,879 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 23:14:06,880 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 8] total 12 [2019-10-14 23:14:06,880 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1217140762] [2019-10-14 23:14:06,880 INFO L442 AbstractCegarLoop]: Interpolant automaton has 12 states [2019-10-14 23:14:06,881 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 23:14:06,881 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2019-10-14 23:14:06,881 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=90, Unknown=0, NotChecked=0, Total=132 [2019-10-14 23:14:06,881 INFO L87 Difference]: Start difference. First operand 46 states and 53 transitions. Second operand 12 states. [2019-10-14 23:14:07,015 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 23:14:07,016 INFO L93 Difference]: Finished difference Result 86 states and 102 transitions. [2019-10-14 23:14:07,018 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2019-10-14 23:14:07,018 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 45 [2019-10-14 23:14:07,018 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 23:14:07,021 INFO L225 Difference]: With dead ends: 86 [2019-10-14 23:14:07,021 INFO L226 Difference]: Without dead ends: 54 [2019-10-14 23:14:07,022 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 46 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=52, Invalid=130, Unknown=0, NotChecked=0, Total=182 [2019-10-14 23:14:07,022 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2019-10-14 23:14:07,031 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 52. [2019-10-14 23:14:07,032 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 52 states. [2019-10-14 23:14:07,034 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 60 transitions. [2019-10-14 23:14:07,034 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 60 transitions. Word has length 45 [2019-10-14 23:14:07,034 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 23:14:07,034 INFO L462 AbstractCegarLoop]: Abstraction has 52 states and 60 transitions. [2019-10-14 23:14:07,034 INFO L463 AbstractCegarLoop]: Interpolant automaton has 12 states. [2019-10-14 23:14:07,035 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 60 transitions. [2019-10-14 23:14:07,036 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2019-10-14 23:14:07,036 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 23:14:07,036 INFO L380 BasicCegarLoop]: trace histogram [7, 7, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 23:14:07,244 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 23:14:07,245 INFO L410 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 23:14:07,246 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 23:14:07,246 INFO L82 PathProgramCache]: Analyzing trace with hash 291327568, now seen corresponding path program 6 times [2019-10-14 23:14:07,246 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 23:14:07,247 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [756364152] [2019-10-14 23:14:07,247 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:14:07,248 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:14:07,248 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 23:14:07,274 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:14:07,417 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:14:07,423 INFO L134 CoverageAnalysis]: Checked inductivity of 114 backedges. 0 proven. 78 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2019-10-14 23:14:07,423 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [756364152] [2019-10-14 23:14:07,424 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [728718157] [2019-10-14 23:14:07,424 INFO L92 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 23:14:07,498 INFO L249 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2019-10-14 23:14:07,498 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 23:14:07,499 INFO L256 TraceCheckSpWp]: Trace formula consists of 139 conjuncts, 8 conjunts are in the unsatisfiable core [2019-10-14 23:14:07,502 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 23:14:07,534 INFO L134 CoverageAnalysis]: Checked inductivity of 114 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2019-10-14 23:14:07,535 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 23:14:07,535 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 9] total 13 [2019-10-14 23:14:07,535 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [764966913] [2019-10-14 23:14:07,536 INFO L442 AbstractCegarLoop]: Interpolant automaton has 13 states [2019-10-14 23:14:07,536 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 23:14:07,536 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2019-10-14 23:14:07,536 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=105, Unknown=0, NotChecked=0, Total=156 [2019-10-14 23:14:07,537 INFO L87 Difference]: Start difference. First operand 52 states and 60 transitions. Second operand 13 states. [2019-10-14 23:14:07,692 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 23:14:07,693 INFO L93 Difference]: Finished difference Result 96 states and 114 transitions. [2019-10-14 23:14:07,693 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2019-10-14 23:14:07,693 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 51 [2019-10-14 23:14:07,693 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 23:14:07,694 INFO L225 Difference]: With dead ends: 96 [2019-10-14 23:14:07,694 INFO L226 Difference]: Without dead ends: 60 [2019-10-14 23:14:07,695 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 52 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=61, Invalid=149, Unknown=0, NotChecked=0, Total=210 [2019-10-14 23:14:07,696 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2019-10-14 23:14:07,701 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 58. [2019-10-14 23:14:07,701 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 58 states. [2019-10-14 23:14:07,702 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 67 transitions. [2019-10-14 23:14:07,702 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 67 transitions. Word has length 51 [2019-10-14 23:14:07,702 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 23:14:07,702 INFO L462 AbstractCegarLoop]: Abstraction has 58 states and 67 transitions. [2019-10-14 23:14:07,703 INFO L463 AbstractCegarLoop]: Interpolant automaton has 13 states. [2019-10-14 23:14:07,703 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 67 transitions. [2019-10-14 23:14:07,703 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2019-10-14 23:14:07,704 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 23:14:07,704 INFO L380 BasicCegarLoop]: trace histogram [8, 8, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 23:14:07,907 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 23:14:07,908 INFO L410 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 23:14:07,908 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 23:14:07,909 INFO L82 PathProgramCache]: Analyzing trace with hash 1655462505, now seen corresponding path program 7 times [2019-10-14 23:14:07,909 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 23:14:07,909 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [950171625] [2019-10-14 23:14:07,910 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:14:07,910 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:14:07,910 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 23:14:07,928 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:14:08,047 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:14:08,051 INFO L134 CoverageAnalysis]: Checked inductivity of 154 backedges. 0 proven. 105 refuted. 0 times theorem prover too weak. 49 trivial. 0 not checked. [2019-10-14 23:14:08,052 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [950171625] [2019-10-14 23:14:08,052 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1528055242] [2019-10-14 23:14:08,052 INFO L92 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 23:14:08,098 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:14:08,099 INFO L256 TraceCheckSpWp]: Trace formula consists of 153 conjuncts, 9 conjunts are in the unsatisfiable core [2019-10-14 23:14:08,102 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 23:14:08,133 INFO L134 CoverageAnalysis]: Checked inductivity of 154 backedges. 0 proven. 49 refuted. 0 times theorem prover too weak. 105 trivial. 0 not checked. [2019-10-14 23:14:08,133 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 23:14:08,134 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 10] total 14 [2019-10-14 23:14:08,134 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [844043791] [2019-10-14 23:14:08,137 INFO L442 AbstractCegarLoop]: Interpolant automaton has 14 states [2019-10-14 23:14:08,137 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 23:14:08,138 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2019-10-14 23:14:08,138 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=61, Invalid=121, Unknown=0, NotChecked=0, Total=182 [2019-10-14 23:14:08,138 INFO L87 Difference]: Start difference. First operand 58 states and 67 transitions. Second operand 14 states. [2019-10-14 23:14:08,286 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 23:14:08,287 INFO L93 Difference]: Finished difference Result 106 states and 126 transitions. [2019-10-14 23:14:08,287 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2019-10-14 23:14:08,287 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 57 [2019-10-14 23:14:08,288 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 23:14:08,288 INFO L225 Difference]: With dead ends: 106 [2019-10-14 23:14:08,288 INFO L226 Difference]: Without dead ends: 66 [2019-10-14 23:14:08,292 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 72 GetRequests, 58 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 35 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=71, Invalid=169, Unknown=0, NotChecked=0, Total=240 [2019-10-14 23:14:08,293 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2019-10-14 23:14:08,300 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 64. [2019-10-14 23:14:08,300 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 64 states. [2019-10-14 23:14:08,303 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 74 transitions. [2019-10-14 23:14:08,304 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 74 transitions. Word has length 57 [2019-10-14 23:14:08,304 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 23:14:08,304 INFO L462 AbstractCegarLoop]: Abstraction has 64 states and 74 transitions. [2019-10-14 23:14:08,304 INFO L463 AbstractCegarLoop]: Interpolant automaton has 14 states. [2019-10-14 23:14:08,304 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 74 transitions. [2019-10-14 23:14:08,305 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2019-10-14 23:14:08,305 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 23:14:08,305 INFO L380 BasicCegarLoop]: trace histogram [9, 9, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 23:14:08,517 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 23:14:08,518 INFO L410 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 23:14:08,518 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 23:14:08,518 INFO L82 PathProgramCache]: Analyzing trace with hash -454876286, now seen corresponding path program 8 times [2019-10-14 23:14:08,518 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 23:14:08,518 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1687731884] [2019-10-14 23:14:08,519 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:14:08,519 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:14:08,519 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 23:14:08,541 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:14:08,670 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:14:08,680 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 0 proven. 136 refuted. 0 times theorem prover too weak. 64 trivial. 0 not checked. [2019-10-14 23:14:08,680 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1687731884] [2019-10-14 23:14:08,681 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1774277092] [2019-10-14 23:14:08,681 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 23:14:08,767 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-10-14 23:14:08,768 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 23:14:08,769 INFO L256 TraceCheckSpWp]: Trace formula consists of 167 conjuncts, 10 conjunts are in the unsatisfiable core [2019-10-14 23:14:08,783 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 23:14:08,815 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 136 trivial. 0 not checked. [2019-10-14 23:14:08,815 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 23:14:08,815 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 11] total 15 [2019-10-14 23:14:08,816 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1701263060] [2019-10-14 23:14:08,817 INFO L442 AbstractCegarLoop]: Interpolant automaton has 15 states [2019-10-14 23:14:08,818 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 23:14:08,819 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2019-10-14 23:14:08,819 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=72, Invalid=138, Unknown=0, NotChecked=0, Total=210 [2019-10-14 23:14:08,819 INFO L87 Difference]: Start difference. First operand 64 states and 74 transitions. Second operand 15 states. [2019-10-14 23:14:08,999 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 23:14:08,999 INFO L93 Difference]: Finished difference Result 116 states and 138 transitions. [2019-10-14 23:14:08,999 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2019-10-14 23:14:09,000 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 63 [2019-10-14 23:14:09,000 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 23:14:09,001 INFO L225 Difference]: With dead ends: 116 [2019-10-14 23:14:09,001 INFO L226 Difference]: Without dead ends: 72 [2019-10-14 23:14:09,002 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 79 GetRequests, 64 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=82, Invalid=190, Unknown=0, NotChecked=0, Total=272 [2019-10-14 23:14:09,002 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2019-10-14 23:14:09,013 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 70. [2019-10-14 23:14:09,014 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 70 states. [2019-10-14 23:14:09,015 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 81 transitions. [2019-10-14 23:14:09,015 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 81 transitions. Word has length 63 [2019-10-14 23:14:09,015 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 23:14:09,015 INFO L462 AbstractCegarLoop]: Abstraction has 70 states and 81 transitions. [2019-10-14 23:14:09,015 INFO L463 AbstractCegarLoop]: Interpolant automaton has 15 states. [2019-10-14 23:14:09,016 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 81 transitions. [2019-10-14 23:14:09,020 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2019-10-14 23:14:09,020 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 23:14:09,020 INFO L380 BasicCegarLoop]: trace histogram [10, 10, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 23:14:09,235 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 23:14:09,235 INFO L410 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 23:14:09,235 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 23:14:09,236 INFO L82 PathProgramCache]: Analyzing trace with hash 1633683867, now seen corresponding path program 9 times [2019-10-14 23:14:09,236 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 23:14:09,236 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1023511609] [2019-10-14 23:14:09,236 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:14:09,236 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:14:09,236 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 23:14:09,255 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:14:09,385 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:14:09,390 INFO L134 CoverageAnalysis]: Checked inductivity of 252 backedges. 0 proven. 171 refuted. 0 times theorem prover too weak. 81 trivial. 0 not checked. [2019-10-14 23:14:09,391 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1023511609] [2019-10-14 23:14:09,391 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2053939611] [2019-10-14 23:14:09,391 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 23:14:09,491 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2019-10-14 23:14:09,491 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 23:14:09,492 INFO L256 TraceCheckSpWp]: Trace formula consists of 181 conjuncts, 11 conjunts are in the unsatisfiable core [2019-10-14 23:14:09,495 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 23:14:09,527 INFO L134 CoverageAnalysis]: Checked inductivity of 252 backedges. 0 proven. 81 refuted. 0 times theorem prover too weak. 171 trivial. 0 not checked. [2019-10-14 23:14:09,528 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 23:14:09,528 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 12] total 16 [2019-10-14 23:14:09,528 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [398433649] [2019-10-14 23:14:09,529 INFO L442 AbstractCegarLoop]: Interpolant automaton has 16 states [2019-10-14 23:14:09,529 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 23:14:09,529 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2019-10-14 23:14:09,530 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=84, Invalid=156, Unknown=0, NotChecked=0, Total=240 [2019-10-14 23:14:09,530 INFO L87 Difference]: Start difference. First operand 70 states and 81 transitions. Second operand 16 states. [2019-10-14 23:14:09,703 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 23:14:09,703 INFO L93 Difference]: Finished difference Result 126 states and 150 transitions. [2019-10-14 23:14:09,704 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2019-10-14 23:14:09,704 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 69 [2019-10-14 23:14:09,704 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 23:14:09,705 INFO L225 Difference]: With dead ends: 126 [2019-10-14 23:14:09,705 INFO L226 Difference]: Without dead ends: 78 [2019-10-14 23:14:09,706 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 86 GetRequests, 70 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 45 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=94, Invalid=212, Unknown=0, NotChecked=0, Total=306 [2019-10-14 23:14:09,706 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2019-10-14 23:14:09,723 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 76. [2019-10-14 23:14:09,723 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 76 states. [2019-10-14 23:14:09,724 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 88 transitions. [2019-10-14 23:14:09,725 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 88 transitions. Word has length 69 [2019-10-14 23:14:09,725 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 23:14:09,725 INFO L462 AbstractCegarLoop]: Abstraction has 76 states and 88 transitions. [2019-10-14 23:14:09,727 INFO L463 AbstractCegarLoop]: Interpolant automaton has 16 states. [2019-10-14 23:14:09,727 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 88 transitions. [2019-10-14 23:14:09,729 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2019-10-14 23:14:09,729 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 23:14:09,729 INFO L380 BasicCegarLoop]: trace histogram [11, 11, 10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 23:14:09,929 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 23:14:09,930 INFO L410 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 23:14:09,931 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 23:14:09,931 INFO L82 PathProgramCache]: Analyzing trace with hash 1277783220, now seen corresponding path program 10 times [2019-10-14 23:14:09,932 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 23:14:09,932 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1063557592] [2019-10-14 23:14:09,932 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:14:09,933 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:14:09,933 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 23:14:09,954 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:14:10,132 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:14:10,140 INFO L134 CoverageAnalysis]: Checked inductivity of 310 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2019-10-14 23:14:10,140 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1063557592] [2019-10-14 23:14:10,141 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [762253037] [2019-10-14 23:14:10,141 INFO L92 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 23:14:10,204 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-10-14 23:14:10,205 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 23:14:10,206 INFO L256 TraceCheckSpWp]: Trace formula consists of 195 conjuncts, 12 conjunts are in the unsatisfiable core [2019-10-14 23:14:10,208 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 23:14:10,232 INFO L134 CoverageAnalysis]: Checked inductivity of 310 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 210 trivial. 0 not checked. [2019-10-14 23:14:10,232 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 23:14:10,233 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 13] total 17 [2019-10-14 23:14:10,233 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [279409819] [2019-10-14 23:14:10,234 INFO L442 AbstractCegarLoop]: Interpolant automaton has 17 states [2019-10-14 23:14:10,234 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 23:14:10,234 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2019-10-14 23:14:10,235 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=97, Invalid=175, Unknown=0, NotChecked=0, Total=272 [2019-10-14 23:14:10,235 INFO L87 Difference]: Start difference. First operand 76 states and 88 transitions. Second operand 17 states. [2019-10-14 23:14:10,450 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 23:14:10,451 INFO L93 Difference]: Finished difference Result 136 states and 162 transitions. [2019-10-14 23:14:10,451 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2019-10-14 23:14:10,451 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 75 [2019-10-14 23:14:10,451 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 23:14:10,452 INFO L225 Difference]: With dead ends: 136 [2019-10-14 23:14:10,453 INFO L226 Difference]: Without dead ends: 84 [2019-10-14 23:14:10,454 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 93 GetRequests, 76 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 50 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=107, Invalid=235, Unknown=0, NotChecked=0, Total=342 [2019-10-14 23:14:10,455 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 84 states. [2019-10-14 23:14:10,459 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 84 to 82. [2019-10-14 23:14:10,460 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 82 states. [2019-10-14 23:14:10,461 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 82 states to 82 states and 95 transitions. [2019-10-14 23:14:10,461 INFO L78 Accepts]: Start accepts. Automaton has 82 states and 95 transitions. Word has length 75 [2019-10-14 23:14:10,461 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 23:14:10,461 INFO L462 AbstractCegarLoop]: Abstraction has 82 states and 95 transitions. [2019-10-14 23:14:10,461 INFO L463 AbstractCegarLoop]: Interpolant automaton has 17 states. [2019-10-14 23:14:10,461 INFO L276 IsEmpty]: Start isEmpty. Operand 82 states and 95 transitions. [2019-10-14 23:14:10,462 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2019-10-14 23:14:10,463 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 23:14:10,463 INFO L380 BasicCegarLoop]: trace histogram [12, 12, 11, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 23:14:10,675 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 23:14:10,676 INFO L410 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 23:14:10,676 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 23:14:10,676 INFO L82 PathProgramCache]: Analyzing trace with hash 770550989, now seen corresponding path program 11 times [2019-10-14 23:14:10,676 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 23:14:10,677 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [413164757] [2019-10-14 23:14:10,677 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:14:10,677 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:14:10,677 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 23:14:10,697 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:14:10,866 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:14:10,879 INFO L134 CoverageAnalysis]: Checked inductivity of 374 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 121 trivial. 0 not checked. [2019-10-14 23:14:10,879 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [413164757] [2019-10-14 23:14:10,880 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [222535904] [2019-10-14 23:14:10,880 INFO L92 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 23:14:11,118 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 12 check-sat command(s) [2019-10-14 23:14:11,118 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 23:14:11,120 INFO L256 TraceCheckSpWp]: Trace formula consists of 209 conjuncts, 13 conjunts are in the unsatisfiable core [2019-10-14 23:14:11,123 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 23:14:11,160 INFO L134 CoverageAnalysis]: Checked inductivity of 374 backedges. 0 proven. 121 refuted. 0 times theorem prover too weak. 253 trivial. 0 not checked. [2019-10-14 23:14:11,161 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 23:14:11,161 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 14] total 18 [2019-10-14 23:14:11,161 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [526580223] [2019-10-14 23:14:11,164 INFO L442 AbstractCegarLoop]: Interpolant automaton has 18 states [2019-10-14 23:14:11,164 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 23:14:11,165 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2019-10-14 23:14:11,166 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=111, Invalid=195, Unknown=0, NotChecked=0, Total=306 [2019-10-14 23:14:11,166 INFO L87 Difference]: Start difference. First operand 82 states and 95 transitions. Second operand 18 states. [2019-10-14 23:14:11,380 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 23:14:11,380 INFO L93 Difference]: Finished difference Result 146 states and 174 transitions. [2019-10-14 23:14:11,381 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2019-10-14 23:14:11,381 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 81 [2019-10-14 23:14:11,381 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 23:14:11,382 INFO L225 Difference]: With dead ends: 146 [2019-10-14 23:14:11,382 INFO L226 Difference]: Without dead ends: 90 [2019-10-14 23:14:11,383 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 100 GetRequests, 82 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 55 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=121, Invalid=259, Unknown=0, NotChecked=0, Total=380 [2019-10-14 23:14:11,384 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 90 states. [2019-10-14 23:14:11,397 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 90 to 88. [2019-10-14 23:14:11,397 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 88 states. [2019-10-14 23:14:11,398 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 88 states to 88 states and 102 transitions. [2019-10-14 23:14:11,398 INFO L78 Accepts]: Start accepts. Automaton has 88 states and 102 transitions. Word has length 81 [2019-10-14 23:14:11,398 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 23:14:11,398 INFO L462 AbstractCegarLoop]: Abstraction has 88 states and 102 transitions. [2019-10-14 23:14:11,399 INFO L463 AbstractCegarLoop]: Interpolant automaton has 18 states. [2019-10-14 23:14:11,399 INFO L276 IsEmpty]: Start isEmpty. Operand 88 states and 102 transitions. [2019-10-14 23:14:11,400 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 88 [2019-10-14 23:14:11,400 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 23:14:11,400 INFO L380 BasicCegarLoop]: trace histogram [13, 13, 12, 12, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 23:14:11,604 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 23:14:11,605 INFO L410 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 23:14:11,605 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 23:14:11,605 INFO L82 PathProgramCache]: Analyzing trace with hash -1912395290, now seen corresponding path program 12 times [2019-10-14 23:14:11,606 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 23:14:11,606 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [374560512] [2019-10-14 23:14:11,606 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:14:11,606 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:14:11,606 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 23:14:11,623 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:14:11,794 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:14:11,802 INFO L134 CoverageAnalysis]: Checked inductivity of 444 backedges. 0 proven. 300 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2019-10-14 23:14:11,802 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [374560512] [2019-10-14 23:14:11,802 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2048227735] [2019-10-14 23:14:11,802 INFO L92 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 23:14:11,950 INFO L249 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 13 check-sat command(s) [2019-10-14 23:14:11,950 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 23:14:11,951 INFO L256 TraceCheckSpWp]: Trace formula consists of 223 conjuncts, 14 conjunts are in the unsatisfiable core [2019-10-14 23:14:11,954 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 23:14:11,972 INFO L134 CoverageAnalysis]: Checked inductivity of 444 backedges. 0 proven. 144 refuted. 0 times theorem prover too weak. 300 trivial. 0 not checked. [2019-10-14 23:14:11,972 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 23:14:11,973 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 15] total 19 [2019-10-14 23:14:11,973 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [147396810] [2019-10-14 23:14:11,973 INFO L442 AbstractCegarLoop]: Interpolant automaton has 19 states [2019-10-14 23:14:11,974 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 23:14:11,974 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2019-10-14 23:14:11,974 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=126, Invalid=216, Unknown=0, NotChecked=0, Total=342 [2019-10-14 23:14:11,974 INFO L87 Difference]: Start difference. First operand 88 states and 102 transitions. Second operand 19 states. [2019-10-14 23:14:12,178 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 23:14:12,178 INFO L93 Difference]: Finished difference Result 156 states and 186 transitions. [2019-10-14 23:14:12,178 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2019-10-14 23:14:12,178 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 87 [2019-10-14 23:14:12,179 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 23:14:12,179 INFO L225 Difference]: With dead ends: 156 [2019-10-14 23:14:12,180 INFO L226 Difference]: Without dead ends: 96 [2019-10-14 23:14:12,180 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 107 GetRequests, 88 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 60 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=136, Invalid=284, Unknown=0, NotChecked=0, Total=420 [2019-10-14 23:14:12,181 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 96 states. [2019-10-14 23:14:12,186 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 96 to 94. [2019-10-14 23:14:12,186 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 94 states. [2019-10-14 23:14:12,187 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 94 states to 94 states and 109 transitions. [2019-10-14 23:14:12,187 INFO L78 Accepts]: Start accepts. Automaton has 94 states and 109 transitions. Word has length 87 [2019-10-14 23:14:12,188 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 23:14:12,188 INFO L462 AbstractCegarLoop]: Abstraction has 94 states and 109 transitions. [2019-10-14 23:14:12,188 INFO L463 AbstractCegarLoop]: Interpolant automaton has 19 states. [2019-10-14 23:14:12,188 INFO L276 IsEmpty]: Start isEmpty. Operand 94 states and 109 transitions. [2019-10-14 23:14:12,189 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 94 [2019-10-14 23:14:12,190 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 23:14:12,190 INFO L380 BasicCegarLoop]: trace histogram [14, 14, 13, 13, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 23:14:12,394 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 23:14:12,394 INFO L410 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 23:14:12,394 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 23:14:12,395 INFO L82 PathProgramCache]: Analyzing trace with hash 1550337023, now seen corresponding path program 13 times [2019-10-14 23:14:12,395 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 23:14:12,395 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [652971141] [2019-10-14 23:14:12,396 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:14:12,396 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:14:12,396 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 23:14:12,413 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:14:12,612 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:14:12,620 INFO L134 CoverageAnalysis]: Checked inductivity of 520 backedges. 0 proven. 351 refuted. 0 times theorem prover too weak. 169 trivial. 0 not checked. [2019-10-14 23:14:12,621 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [652971141] [2019-10-14 23:14:12,621 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1486049706] [2019-10-14 23:14:12,621 INFO L92 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 23:14:12,683 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:14:12,684 INFO L256 TraceCheckSpWp]: Trace formula consists of 237 conjuncts, 15 conjunts are in the unsatisfiable core [2019-10-14 23:14:12,686 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 23:14:12,709 INFO L134 CoverageAnalysis]: Checked inductivity of 520 backedges. 0 proven. 169 refuted. 0 times theorem prover too weak. 351 trivial. 0 not checked. [2019-10-14 23:14:12,709 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 23:14:12,710 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 16] total 20 [2019-10-14 23:14:12,710 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1808451908] [2019-10-14 23:14:12,710 INFO L442 AbstractCegarLoop]: Interpolant automaton has 20 states [2019-10-14 23:14:12,711 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 23:14:12,711 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2019-10-14 23:14:12,711 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=142, Invalid=238, Unknown=0, NotChecked=0, Total=380 [2019-10-14 23:14:12,711 INFO L87 Difference]: Start difference. First operand 94 states and 109 transitions. Second operand 20 states. [2019-10-14 23:14:12,908 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 23:14:12,909 INFO L93 Difference]: Finished difference Result 166 states and 198 transitions. [2019-10-14 23:14:12,909 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2019-10-14 23:14:12,909 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 93 [2019-10-14 23:14:12,910 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 23:14:12,910 INFO L225 Difference]: With dead ends: 166 [2019-10-14 23:14:12,910 INFO L226 Difference]: Without dead ends: 102 [2019-10-14 23:14:12,911 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 114 GetRequests, 94 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 65 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=152, Invalid=310, Unknown=0, NotChecked=0, Total=462 [2019-10-14 23:14:12,912 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 102 states. [2019-10-14 23:14:12,915 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 102 to 100. [2019-10-14 23:14:12,915 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 100 states. [2019-10-14 23:14:12,916 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 100 states to 100 states and 116 transitions. [2019-10-14 23:14:12,916 INFO L78 Accepts]: Start accepts. Automaton has 100 states and 116 transitions. Word has length 93 [2019-10-14 23:14:12,916 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 23:14:12,916 INFO L462 AbstractCegarLoop]: Abstraction has 100 states and 116 transitions. [2019-10-14 23:14:12,916 INFO L463 AbstractCegarLoop]: Interpolant automaton has 20 states. [2019-10-14 23:14:12,917 INFO L276 IsEmpty]: Start isEmpty. Operand 100 states and 116 transitions. [2019-10-14 23:14:12,918 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 100 [2019-10-14 23:14:12,918 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 23:14:12,918 INFO L380 BasicCegarLoop]: trace histogram [15, 15, 14, 14, 14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 23:14:13,123 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 23:14:13,123 INFO L410 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 23:14:13,123 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 23:14:13,123 INFO L82 PathProgramCache]: Analyzing trace with hash -607954152, now seen corresponding path program 14 times [2019-10-14 23:14:13,123 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 23:14:13,124 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [366947499] [2019-10-14 23:14:13,124 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:14:13,124 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:14:13,124 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 23:14:13,159 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:14:13,349 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:14:13,356 INFO L134 CoverageAnalysis]: Checked inductivity of 602 backedges. 0 proven. 406 refuted. 0 times theorem prover too weak. 196 trivial. 0 not checked. [2019-10-14 23:14:13,357 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [366947499] [2019-10-14 23:14:13,357 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2099099609] [2019-10-14 23:14:13,357 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 23:14:13,424 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-10-14 23:14:13,425 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 23:14:13,426 INFO L256 TraceCheckSpWp]: Trace formula consists of 251 conjuncts, 16 conjunts are in the unsatisfiable core [2019-10-14 23:14:13,428 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 23:14:13,475 INFO L134 CoverageAnalysis]: Checked inductivity of 602 backedges. 0 proven. 196 refuted. 0 times theorem prover too weak. 406 trivial. 0 not checked. [2019-10-14 23:14:13,476 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 23:14:13,476 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 17] total 21 [2019-10-14 23:14:13,476 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1550931199] [2019-10-14 23:14:13,477 INFO L442 AbstractCegarLoop]: Interpolant automaton has 21 states [2019-10-14 23:14:13,477 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 23:14:13,477 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2019-10-14 23:14:13,477 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=159, Invalid=261, Unknown=0, NotChecked=0, Total=420 [2019-10-14 23:14:13,478 INFO L87 Difference]: Start difference. First operand 100 states and 116 transitions. Second operand 21 states. [2019-10-14 23:14:13,721 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 23:14:13,721 INFO L93 Difference]: Finished difference Result 176 states and 210 transitions. [2019-10-14 23:14:13,721 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2019-10-14 23:14:13,722 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 99 [2019-10-14 23:14:13,722 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 23:14:13,723 INFO L225 Difference]: With dead ends: 176 [2019-10-14 23:14:13,723 INFO L226 Difference]: Without dead ends: 108 [2019-10-14 23:14:13,724 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 121 GetRequests, 100 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 70 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=169, Invalid=337, Unknown=0, NotChecked=0, Total=506 [2019-10-14 23:14:13,725 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 108 states. [2019-10-14 23:14:13,729 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 108 to 106. [2019-10-14 23:14:13,729 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 106 states. [2019-10-14 23:14:13,729 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 106 states to 106 states and 123 transitions. [2019-10-14 23:14:13,730 INFO L78 Accepts]: Start accepts. Automaton has 106 states and 123 transitions. Word has length 99 [2019-10-14 23:14:13,730 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 23:14:13,730 INFO L462 AbstractCegarLoop]: Abstraction has 106 states and 123 transitions. [2019-10-14 23:14:13,730 INFO L463 AbstractCegarLoop]: Interpolant automaton has 21 states. [2019-10-14 23:14:13,730 INFO L276 IsEmpty]: Start isEmpty. Operand 106 states and 123 transitions. [2019-10-14 23:14:13,731 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 106 [2019-10-14 23:14:13,732 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 23:14:13,732 INFO L380 BasicCegarLoop]: trace histogram [16, 16, 15, 15, 15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 23:14:13,936 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 23:14:13,936 INFO L410 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 23:14:13,937 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 23:14:13,937 INFO L82 PathProgramCache]: Analyzing trace with hash 191024945, now seen corresponding path program 15 times [2019-10-14 23:14:13,938 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 23:14:13,938 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2107037473] [2019-10-14 23:14:13,938 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:14:13,939 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:14:13,939 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 23:14:13,957 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:14:14,165 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:14:14,175 INFO L134 CoverageAnalysis]: Checked inductivity of 690 backedges. 0 proven. 465 refuted. 0 times theorem prover too weak. 225 trivial. 0 not checked. [2019-10-14 23:14:14,175 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2107037473] [2019-10-14 23:14:14,175 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1427245160] [2019-10-14 23:14:14,175 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 23:14:14,469 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 16 check-sat command(s) [2019-10-14 23:14:14,470 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 23:14:14,472 INFO L256 TraceCheckSpWp]: Trace formula consists of 265 conjuncts, 17 conjunts are in the unsatisfiable core [2019-10-14 23:14:14,474 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 23:14:14,501 INFO L134 CoverageAnalysis]: Checked inductivity of 690 backedges. 0 proven. 225 refuted. 0 times theorem prover too weak. 465 trivial. 0 not checked. [2019-10-14 23:14:14,502 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 23:14:14,502 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 18] total 22 [2019-10-14 23:14:14,502 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1008875274] [2019-10-14 23:14:14,502 INFO L442 AbstractCegarLoop]: Interpolant automaton has 22 states [2019-10-14 23:14:14,502 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 23:14:14,503 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2019-10-14 23:14:14,503 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=177, Invalid=285, Unknown=0, NotChecked=0, Total=462 [2019-10-14 23:14:14,503 INFO L87 Difference]: Start difference. First operand 106 states and 123 transitions. Second operand 22 states. [2019-10-14 23:14:14,789 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 23:14:14,790 INFO L93 Difference]: Finished difference Result 186 states and 222 transitions. [2019-10-14 23:14:14,790 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2019-10-14 23:14:14,790 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 105 [2019-10-14 23:14:14,791 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 23:14:14,792 INFO L225 Difference]: With dead ends: 186 [2019-10-14 23:14:14,792 INFO L226 Difference]: Without dead ends: 114 [2019-10-14 23:14:14,793 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 128 GetRequests, 106 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 75 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=187, Invalid=365, Unknown=0, NotChecked=0, Total=552 [2019-10-14 23:14:14,793 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 114 states. [2019-10-14 23:14:14,797 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 114 to 112. [2019-10-14 23:14:14,798 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 112 states. [2019-10-14 23:14:14,798 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 112 states to 112 states and 130 transitions. [2019-10-14 23:14:14,798 INFO L78 Accepts]: Start accepts. Automaton has 112 states and 130 transitions. Word has length 105 [2019-10-14 23:14:14,799 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 23:14:14,799 INFO L462 AbstractCegarLoop]: Abstraction has 112 states and 130 transitions. [2019-10-14 23:14:14,799 INFO L463 AbstractCegarLoop]: Interpolant automaton has 22 states. [2019-10-14 23:14:14,799 INFO L276 IsEmpty]: Start isEmpty. Operand 112 states and 130 transitions. [2019-10-14 23:14:14,800 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 112 [2019-10-14 23:14:14,800 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 23:14:14,800 INFO L380 BasicCegarLoop]: trace histogram [17, 17, 16, 16, 16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 23:14:15,005 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 23:14:15,005 INFO L410 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 23:14:15,006 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 23:14:15,006 INFO L82 PathProgramCache]: Analyzing trace with hash -1858273206, now seen corresponding path program 16 times [2019-10-14 23:14:15,006 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 23:14:15,007 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1582045049] [2019-10-14 23:14:15,007 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:14:15,007 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:14:15,008 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 23:14:15,026 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:14:15,224 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:14:15,233 INFO L134 CoverageAnalysis]: Checked inductivity of 784 backedges. 0 proven. 528 refuted. 0 times theorem prover too weak. 256 trivial. 0 not checked. [2019-10-14 23:14:15,233 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1582045049] [2019-10-14 23:14:15,233 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1577500837] [2019-10-14 23:14:15,233 INFO L92 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 23:14:15,303 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-10-14 23:14:15,303 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 23:14:15,304 INFO L256 TraceCheckSpWp]: Trace formula consists of 279 conjuncts, 18 conjunts are in the unsatisfiable core [2019-10-14 23:14:15,306 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 23:14:15,348 INFO L134 CoverageAnalysis]: Checked inductivity of 784 backedges. 0 proven. 256 refuted. 0 times theorem prover too weak. 528 trivial. 0 not checked. [2019-10-14 23:14:15,349 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 23:14:15,349 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 19] total 23 [2019-10-14 23:14:15,349 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1974442056] [2019-10-14 23:14:15,350 INFO L442 AbstractCegarLoop]: Interpolant automaton has 23 states [2019-10-14 23:14:15,350 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 23:14:15,350 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2019-10-14 23:14:15,351 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=196, Invalid=310, Unknown=0, NotChecked=0, Total=506 [2019-10-14 23:14:15,351 INFO L87 Difference]: Start difference. First operand 112 states and 130 transitions. Second operand 23 states. [2019-10-14 23:14:15,611 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 23:14:15,611 INFO L93 Difference]: Finished difference Result 196 states and 234 transitions. [2019-10-14 23:14:15,611 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2019-10-14 23:14:15,611 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 111 [2019-10-14 23:14:15,612 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 23:14:15,613 INFO L225 Difference]: With dead ends: 196 [2019-10-14 23:14:15,613 INFO L226 Difference]: Without dead ends: 120 [2019-10-14 23:14:15,614 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 135 GetRequests, 112 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 80 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=206, Invalid=394, Unknown=0, NotChecked=0, Total=600 [2019-10-14 23:14:15,615 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 120 states. [2019-10-14 23:14:15,618 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 120 to 118. [2019-10-14 23:14:15,618 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 118 states. [2019-10-14 23:14:15,618 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 118 states to 118 states and 137 transitions. [2019-10-14 23:14:15,619 INFO L78 Accepts]: Start accepts. Automaton has 118 states and 137 transitions. Word has length 111 [2019-10-14 23:14:15,619 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 23:14:15,619 INFO L462 AbstractCegarLoop]: Abstraction has 118 states and 137 transitions. [2019-10-14 23:14:15,619 INFO L463 AbstractCegarLoop]: Interpolant automaton has 23 states. [2019-10-14 23:14:15,619 INFO L276 IsEmpty]: Start isEmpty. Operand 118 states and 137 transitions. [2019-10-14 23:14:15,620 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 118 [2019-10-14 23:14:15,620 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 23:14:15,620 INFO L380 BasicCegarLoop]: trace histogram [18, 18, 17, 17, 17, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 23:14:15,824 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 23:14:15,825 INFO L410 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 23:14:15,825 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 23:14:15,825 INFO L82 PathProgramCache]: Analyzing trace with hash 602951267, now seen corresponding path program 17 times [2019-10-14 23:14:15,826 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 23:14:15,826 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1748585917] [2019-10-14 23:14:15,826 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:14:15,826 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:14:15,827 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 23:14:15,847 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:14:16,153 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:14:16,173 INFO L134 CoverageAnalysis]: Checked inductivity of 884 backedges. 0 proven. 595 refuted. 0 times theorem prover too weak. 289 trivial. 0 not checked. [2019-10-14 23:14:16,174 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1748585917] [2019-10-14 23:14:16,174 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1898258378] [2019-10-14 23:14:16,174 INFO L92 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 23:14:16,729 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 18 check-sat command(s) [2019-10-14 23:14:16,730 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 23:14:16,734 INFO L256 TraceCheckSpWp]: Trace formula consists of 293 conjuncts, 19 conjunts are in the unsatisfiable core [2019-10-14 23:14:16,736 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 23:14:16,764 INFO L134 CoverageAnalysis]: Checked inductivity of 884 backedges. 0 proven. 289 refuted. 0 times theorem prover too weak. 595 trivial. 0 not checked. [2019-10-14 23:14:16,765 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 23:14:16,765 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 20] total 24 [2019-10-14 23:14:16,765 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1336560861] [2019-10-14 23:14:16,766 INFO L442 AbstractCegarLoop]: Interpolant automaton has 24 states [2019-10-14 23:14:16,766 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 23:14:16,766 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2019-10-14 23:14:16,767 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=216, Invalid=336, Unknown=0, NotChecked=0, Total=552 [2019-10-14 23:14:16,767 INFO L87 Difference]: Start difference. First operand 118 states and 137 transitions. Second operand 24 states. [2019-10-14 23:14:16,955 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 23:14:16,956 INFO L93 Difference]: Finished difference Result 206 states and 246 transitions. [2019-10-14 23:14:16,956 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2019-10-14 23:14:16,956 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 117 [2019-10-14 23:14:16,956 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 23:14:16,957 INFO L225 Difference]: With dead ends: 206 [2019-10-14 23:14:16,958 INFO L226 Difference]: Without dead ends: 126 [2019-10-14 23:14:16,959 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 142 GetRequests, 118 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 85 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=226, Invalid=424, Unknown=0, NotChecked=0, Total=650 [2019-10-14 23:14:16,959 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 126 states. [2019-10-14 23:14:16,962 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 126 to 124. [2019-10-14 23:14:16,962 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 124 states. [2019-10-14 23:14:16,963 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 124 states to 124 states and 144 transitions. [2019-10-14 23:14:16,963 INFO L78 Accepts]: Start accepts. Automaton has 124 states and 144 transitions. Word has length 117 [2019-10-14 23:14:16,964 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 23:14:16,964 INFO L462 AbstractCegarLoop]: Abstraction has 124 states and 144 transitions. [2019-10-14 23:14:16,964 INFO L463 AbstractCegarLoop]: Interpolant automaton has 24 states. [2019-10-14 23:14:16,964 INFO L276 IsEmpty]: Start isEmpty. Operand 124 states and 144 transitions. [2019-10-14 23:14:16,964 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 124 [2019-10-14 23:14:16,965 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 23:14:16,965 INFO L380 BasicCegarLoop]: trace histogram [19, 19, 18, 18, 18, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 23:14:17,168 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 23:14:17,169 INFO L410 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 23:14:17,169 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 23:14:17,170 INFO L82 PathProgramCache]: Analyzing trace with hash 1958943100, now seen corresponding path program 18 times [2019-10-14 23:14:17,170 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 23:14:17,170 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1914382383] [2019-10-14 23:14:17,170 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:14:17,171 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:14:17,171 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 23:14:17,194 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:14:17,441 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:14:17,471 INFO L134 CoverageAnalysis]: Checked inductivity of 990 backedges. 0 proven. 666 refuted. 0 times theorem prover too weak. 324 trivial. 0 not checked. [2019-10-14 23:14:17,471 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1914382383] [2019-10-14 23:14:17,471 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [117111866] [2019-10-14 23:14:17,472 INFO L92 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 23:14:18,036 INFO L249 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 19 check-sat command(s) [2019-10-14 23:14:18,036 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 23:14:18,039 INFO L256 TraceCheckSpWp]: Trace formula consists of 307 conjuncts, 20 conjunts are in the unsatisfiable core [2019-10-14 23:14:18,041 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 23:14:18,077 INFO L134 CoverageAnalysis]: Checked inductivity of 990 backedges. 0 proven. 324 refuted. 0 times theorem prover too weak. 666 trivial. 0 not checked. [2019-10-14 23:14:18,078 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 23:14:18,078 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 21] total 25 [2019-10-14 23:14:18,078 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [164526324] [2019-10-14 23:14:18,081 INFO L442 AbstractCegarLoop]: Interpolant automaton has 25 states [2019-10-14 23:14:18,081 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 23:14:18,083 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2019-10-14 23:14:18,083 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=237, Invalid=363, Unknown=0, NotChecked=0, Total=600 [2019-10-14 23:14:18,083 INFO L87 Difference]: Start difference. First operand 124 states and 144 transitions. Second operand 25 states. [2019-10-14 23:14:18,360 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 23:14:18,361 INFO L93 Difference]: Finished difference Result 216 states and 258 transitions. [2019-10-14 23:14:18,361 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2019-10-14 23:14:18,361 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 123 [2019-10-14 23:14:18,361 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 23:14:18,362 INFO L225 Difference]: With dead ends: 216 [2019-10-14 23:14:18,362 INFO L226 Difference]: Without dead ends: 132 [2019-10-14 23:14:18,363 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 149 GetRequests, 124 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 90 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=247, Invalid=455, Unknown=0, NotChecked=0, Total=702 [2019-10-14 23:14:18,363 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 132 states. [2019-10-14 23:14:18,365 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 132 to 130. [2019-10-14 23:14:18,365 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 130 states. [2019-10-14 23:14:18,366 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 130 states to 130 states and 151 transitions. [2019-10-14 23:14:18,366 INFO L78 Accepts]: Start accepts. Automaton has 130 states and 151 transitions. Word has length 123 [2019-10-14 23:14:18,366 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 23:14:18,366 INFO L462 AbstractCegarLoop]: Abstraction has 130 states and 151 transitions. [2019-10-14 23:14:18,366 INFO L463 AbstractCegarLoop]: Interpolant automaton has 25 states. [2019-10-14 23:14:18,367 INFO L276 IsEmpty]: Start isEmpty. Operand 130 states and 151 transitions. [2019-10-14 23:14:18,367 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 130 [2019-10-14 23:14:18,367 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 23:14:18,367 INFO L380 BasicCegarLoop]: trace histogram [20, 20, 19, 19, 19, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 23:14:18,568 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 23:14:18,568 INFO L410 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 23:14:18,568 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 23:14:18,569 INFO L82 PathProgramCache]: Analyzing trace with hash -1717321323, now seen corresponding path program 19 times [2019-10-14 23:14:18,569 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 23:14:18,569 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1913880413] [2019-10-14 23:14:18,570 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:14:18,570 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:14:18,570 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 23:14:18,593 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:14:18,892 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:14:18,904 INFO L134 CoverageAnalysis]: Checked inductivity of 1102 backedges. 0 proven. 741 refuted. 0 times theorem prover too weak. 361 trivial. 0 not checked. [2019-10-14 23:14:18,904 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1913880413] [2019-10-14 23:14:18,905 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1344748560] [2019-10-14 23:14:18,905 INFO L92 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 23:14:19,001 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:14:19,002 INFO L256 TraceCheckSpWp]: Trace formula consists of 321 conjuncts, 21 conjunts are in the unsatisfiable core [2019-10-14 23:14:19,004 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 23:14:19,026 INFO L134 CoverageAnalysis]: Checked inductivity of 1102 backedges. 0 proven. 361 refuted. 0 times theorem prover too weak. 741 trivial. 0 not checked. [2019-10-14 23:14:19,026 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 23:14:19,026 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 22] total 26 [2019-10-14 23:14:19,026 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [936344561] [2019-10-14 23:14:19,027 INFO L442 AbstractCegarLoop]: Interpolant automaton has 26 states [2019-10-14 23:14:19,027 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 23:14:19,027 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2019-10-14 23:14:19,028 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=259, Invalid=391, Unknown=0, NotChecked=0, Total=650 [2019-10-14 23:14:19,028 INFO L87 Difference]: Start difference. First operand 130 states and 151 transitions. Second operand 26 states. [2019-10-14 23:14:19,319 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 23:14:19,320 INFO L93 Difference]: Finished difference Result 226 states and 270 transitions. [2019-10-14 23:14:19,323 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2019-10-14 23:14:19,323 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 129 [2019-10-14 23:14:19,323 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 23:14:19,324 INFO L225 Difference]: With dead ends: 226 [2019-10-14 23:14:19,324 INFO L226 Difference]: Without dead ends: 138 [2019-10-14 23:14:19,325 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 156 GetRequests, 130 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 95 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=269, Invalid=487, Unknown=0, NotChecked=0, Total=756 [2019-10-14 23:14:19,325 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 138 states. [2019-10-14 23:14:19,329 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 138 to 136. [2019-10-14 23:14:19,329 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 136 states. [2019-10-14 23:14:19,330 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 136 states to 136 states and 158 transitions. [2019-10-14 23:14:19,330 INFO L78 Accepts]: Start accepts. Automaton has 136 states and 158 transitions. Word has length 129 [2019-10-14 23:14:19,330 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 23:14:19,330 INFO L462 AbstractCegarLoop]: Abstraction has 136 states and 158 transitions. [2019-10-14 23:14:19,330 INFO L463 AbstractCegarLoop]: Interpolant automaton has 26 states. [2019-10-14 23:14:19,330 INFO L276 IsEmpty]: Start isEmpty. Operand 136 states and 158 transitions. [2019-10-14 23:14:19,331 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 136 [2019-10-14 23:14:19,331 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 23:14:19,331 INFO L380 BasicCegarLoop]: trace histogram [21, 21, 20, 20, 20, 20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 23:14:19,532 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 23:14:19,533 INFO L410 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 23:14:19,533 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 23:14:19,533 INFO L82 PathProgramCache]: Analyzing trace with hash -148330834, now seen corresponding path program 20 times [2019-10-14 23:14:19,533 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 23:14:19,534 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1430196176] [2019-10-14 23:14:19,534 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:14:19,534 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:14:19,534 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 23:14:19,554 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:14:19,852 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:14:19,871 INFO L134 CoverageAnalysis]: Checked inductivity of 1220 backedges. 0 proven. 820 refuted. 0 times theorem prover too weak. 400 trivial. 0 not checked. [2019-10-14 23:14:19,873 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1430196176] [2019-10-14 23:14:19,873 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2059281106] [2019-10-14 23:14:19,873 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 23:14:19,978 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-10-14 23:14:19,978 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 23:14:19,980 INFO L256 TraceCheckSpWp]: Trace formula consists of 335 conjuncts, 22 conjunts are in the unsatisfiable core [2019-10-14 23:14:19,985 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 23:14:20,039 INFO L134 CoverageAnalysis]: Checked inductivity of 1220 backedges. 0 proven. 400 refuted. 0 times theorem prover too weak. 820 trivial. 0 not checked. [2019-10-14 23:14:20,040 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 23:14:20,040 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 23] total 27 [2019-10-14 23:14:20,040 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [779282307] [2019-10-14 23:14:20,044 INFO L442 AbstractCegarLoop]: Interpolant automaton has 27 states [2019-10-14 23:14:20,045 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 23:14:20,045 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2019-10-14 23:14:20,046 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=282, Invalid=420, Unknown=0, NotChecked=0, Total=702 [2019-10-14 23:14:20,046 INFO L87 Difference]: Start difference. First operand 136 states and 158 transitions. Second operand 27 states. [2019-10-14 23:14:20,344 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 23:14:20,344 INFO L93 Difference]: Finished difference Result 236 states and 282 transitions. [2019-10-14 23:14:20,345 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2019-10-14 23:14:20,345 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 135 [2019-10-14 23:14:20,345 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 23:14:20,346 INFO L225 Difference]: With dead ends: 236 [2019-10-14 23:14:20,346 INFO L226 Difference]: Without dead ends: 144 [2019-10-14 23:14:20,347 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 163 GetRequests, 136 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 100 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=292, Invalid=520, Unknown=0, NotChecked=0, Total=812 [2019-10-14 23:14:20,348 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 144 states. [2019-10-14 23:14:20,351 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 144 to 142. [2019-10-14 23:14:20,351 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 142 states. [2019-10-14 23:14:20,352 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 142 states to 142 states and 165 transitions. [2019-10-14 23:14:20,352 INFO L78 Accepts]: Start accepts. Automaton has 142 states and 165 transitions. Word has length 135 [2019-10-14 23:14:20,352 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 23:14:20,352 INFO L462 AbstractCegarLoop]: Abstraction has 142 states and 165 transitions. [2019-10-14 23:14:20,352 INFO L463 AbstractCegarLoop]: Interpolant automaton has 27 states. [2019-10-14 23:14:20,352 INFO L276 IsEmpty]: Start isEmpty. Operand 142 states and 165 transitions. [2019-10-14 23:14:20,353 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 142 [2019-10-14 23:14:20,353 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 23:14:20,353 INFO L380 BasicCegarLoop]: trace histogram [22, 22, 21, 21, 21, 21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 23:14:20,557 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 23:14:20,558 INFO L410 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 23:14:20,558 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 23:14:20,558 INFO L82 PathProgramCache]: Analyzing trace with hash -1433392953, now seen corresponding path program 21 times [2019-10-14 23:14:20,558 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 23:14:20,559 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1957112017] [2019-10-14 23:14:20,559 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:14:20,559 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:14:20,560 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 23:14:20,582 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:14:20,938 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:14:20,965 INFO L134 CoverageAnalysis]: Checked inductivity of 1344 backedges. 0 proven. 903 refuted. 0 times theorem prover too weak. 441 trivial. 0 not checked. [2019-10-14 23:14:20,966 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1957112017] [2019-10-14 23:14:20,966 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [831797685] [2019-10-14 23:14:20,966 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 23:14:22,009 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 22 check-sat command(s) [2019-10-14 23:14:22,010 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 23:14:22,013 INFO L256 TraceCheckSpWp]: Trace formula consists of 349 conjuncts, 23 conjunts are in the unsatisfiable core [2019-10-14 23:14:22,015 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 23:14:22,041 INFO L134 CoverageAnalysis]: Checked inductivity of 1344 backedges. 0 proven. 441 refuted. 0 times theorem prover too weak. 903 trivial. 0 not checked. [2019-10-14 23:14:22,042 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 23:14:22,042 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 24] total 28 [2019-10-14 23:14:22,042 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [133007420] [2019-10-14 23:14:22,043 INFO L442 AbstractCegarLoop]: Interpolant automaton has 28 states [2019-10-14 23:14:22,043 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 23:14:22,043 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2019-10-14 23:14:22,043 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=306, Invalid=450, Unknown=0, NotChecked=0, Total=756 [2019-10-14 23:14:22,044 INFO L87 Difference]: Start difference. First operand 142 states and 165 transitions. Second operand 28 states. [2019-10-14 23:14:22,405 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 23:14:22,406 INFO L93 Difference]: Finished difference Result 246 states and 294 transitions. [2019-10-14 23:14:22,406 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2019-10-14 23:14:22,406 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 141 [2019-10-14 23:14:22,407 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 23:14:22,408 INFO L225 Difference]: With dead ends: 246 [2019-10-14 23:14:22,408 INFO L226 Difference]: Without dead ends: 150 [2019-10-14 23:14:22,409 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 170 GetRequests, 142 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 105 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=316, Invalid=554, Unknown=0, NotChecked=0, Total=870 [2019-10-14 23:14:22,409 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 150 states. [2019-10-14 23:14:22,414 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 150 to 148. [2019-10-14 23:14:22,414 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 148 states. [2019-10-14 23:14:22,414 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 148 states to 148 states and 172 transitions. [2019-10-14 23:14:22,415 INFO L78 Accepts]: Start accepts. Automaton has 148 states and 172 transitions. Word has length 141 [2019-10-14 23:14:22,415 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 23:14:22,415 INFO L462 AbstractCegarLoop]: Abstraction has 148 states and 172 transitions. [2019-10-14 23:14:22,415 INFO L463 AbstractCegarLoop]: Interpolant automaton has 28 states. [2019-10-14 23:14:22,415 INFO L276 IsEmpty]: Start isEmpty. Operand 148 states and 172 transitions. [2019-10-14 23:14:22,416 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 148 [2019-10-14 23:14:22,416 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 23:14:22,416 INFO L380 BasicCegarLoop]: trace histogram [23, 23, 22, 22, 22, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 23:14:22,622 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 23:14:22,622 INFO L410 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 23:14:22,623 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 23:14:22,623 INFO L82 PathProgramCache]: Analyzing trace with hash 1942005728, now seen corresponding path program 22 times [2019-10-14 23:14:22,623 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 23:14:22,623 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [665165920] [2019-10-14 23:14:22,624 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:14:22,624 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:14:22,624 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 23:14:22,647 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:14:23,154 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:14:23,178 INFO L134 CoverageAnalysis]: Checked inductivity of 1474 backedges. 0 proven. 990 refuted. 0 times theorem prover too weak. 484 trivial. 0 not checked. [2019-10-14 23:14:23,178 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [665165920] [2019-10-14 23:14:23,179 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [878877144] [2019-10-14 23:14:23,179 INFO L92 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 23:14:23,280 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-10-14 23:14:23,281 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 23:14:23,283 INFO L256 TraceCheckSpWp]: Trace formula consists of 363 conjuncts, 24 conjunts are in the unsatisfiable core [2019-10-14 23:14:23,286 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 23:14:23,319 INFO L134 CoverageAnalysis]: Checked inductivity of 1474 backedges. 0 proven. 484 refuted. 0 times theorem prover too weak. 990 trivial. 0 not checked. [2019-10-14 23:14:23,319 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 23:14:23,320 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 25] total 29 [2019-10-14 23:14:23,320 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [764761905] [2019-10-14 23:14:23,320 INFO L442 AbstractCegarLoop]: Interpolant automaton has 29 states [2019-10-14 23:14:23,321 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 23:14:23,321 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2019-10-14 23:14:23,321 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=331, Invalid=481, Unknown=0, NotChecked=0, Total=812 [2019-10-14 23:14:23,321 INFO L87 Difference]: Start difference. First operand 148 states and 172 transitions. Second operand 29 states. [2019-10-14 23:14:23,661 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 23:14:23,661 INFO L93 Difference]: Finished difference Result 256 states and 306 transitions. [2019-10-14 23:14:23,661 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2019-10-14 23:14:23,661 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 147 [2019-10-14 23:14:23,662 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 23:14:23,663 INFO L225 Difference]: With dead ends: 256 [2019-10-14 23:14:23,663 INFO L226 Difference]: Without dead ends: 156 [2019-10-14 23:14:23,664 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 177 GetRequests, 148 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 110 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=341, Invalid=589, Unknown=0, NotChecked=0, Total=930 [2019-10-14 23:14:23,664 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 156 states. [2019-10-14 23:14:23,668 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 156 to 154. [2019-10-14 23:14:23,668 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 154 states. [2019-10-14 23:14:23,669 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 154 states to 154 states and 179 transitions. [2019-10-14 23:14:23,669 INFO L78 Accepts]: Start accepts. Automaton has 154 states and 179 transitions. Word has length 147 [2019-10-14 23:14:23,670 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 23:14:23,670 INFO L462 AbstractCegarLoop]: Abstraction has 154 states and 179 transitions. [2019-10-14 23:14:23,670 INFO L463 AbstractCegarLoop]: Interpolant automaton has 29 states. [2019-10-14 23:14:23,670 INFO L276 IsEmpty]: Start isEmpty. Operand 154 states and 179 transitions. [2019-10-14 23:14:23,671 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 154 [2019-10-14 23:14:23,671 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 23:14:23,671 INFO L380 BasicCegarLoop]: trace histogram [24, 24, 23, 23, 23, 23, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 23:14:23,875 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 23:14:23,876 INFO L410 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 23:14:23,876 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 23:14:23,876 INFO L82 PathProgramCache]: Analyzing trace with hash 524846073, now seen corresponding path program 23 times [2019-10-14 23:14:23,877 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 23:14:23,877 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [380148255] [2019-10-14 23:14:23,877 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:14:23,877 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:14:23,877 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 23:14:23,901 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:14:24,256 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:14:24,275 INFO L134 CoverageAnalysis]: Checked inductivity of 1610 backedges. 0 proven. 1081 refuted. 0 times theorem prover too weak. 529 trivial. 0 not checked. [2019-10-14 23:14:24,276 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [380148255] [2019-10-14 23:14:24,276 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1420242652] [2019-10-14 23:14:24,276 INFO L92 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 23:14:24,934 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 24 check-sat command(s) [2019-10-14 23:14:24,934 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 23:14:24,938 INFO L256 TraceCheckSpWp]: Trace formula consists of 377 conjuncts, 25 conjunts are in the unsatisfiable core [2019-10-14 23:14:24,940 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 23:14:24,965 INFO L134 CoverageAnalysis]: Checked inductivity of 1610 backedges. 0 proven. 529 refuted. 0 times theorem prover too weak. 1081 trivial. 0 not checked. [2019-10-14 23:14:24,965 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 23:14:24,965 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 26] total 30 [2019-10-14 23:14:24,965 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [898757700] [2019-10-14 23:14:24,966 INFO L442 AbstractCegarLoop]: Interpolant automaton has 30 states [2019-10-14 23:14:24,966 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 23:14:24,966 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2019-10-14 23:14:24,967 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=357, Invalid=513, Unknown=0, NotChecked=0, Total=870 [2019-10-14 23:14:24,967 INFO L87 Difference]: Start difference. First operand 154 states and 179 transitions. Second operand 30 states. [2019-10-14 23:14:25,367 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 23:14:25,367 INFO L93 Difference]: Finished difference Result 266 states and 318 transitions. [2019-10-14 23:14:25,368 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2019-10-14 23:14:25,368 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 153 [2019-10-14 23:14:25,368 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 23:14:25,369 INFO L225 Difference]: With dead ends: 266 [2019-10-14 23:14:25,369 INFO L226 Difference]: Without dead ends: 162 [2019-10-14 23:14:25,370 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 184 GetRequests, 154 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 115 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=367, Invalid=625, Unknown=0, NotChecked=0, Total=992 [2019-10-14 23:14:25,371 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 162 states. [2019-10-14 23:14:25,377 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 162 to 160. [2019-10-14 23:14:25,377 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 160 states. [2019-10-14 23:14:25,385 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 160 states to 160 states and 186 transitions. [2019-10-14 23:14:25,385 INFO L78 Accepts]: Start accepts. Automaton has 160 states and 186 transitions. Word has length 153 [2019-10-14 23:14:25,386 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 23:14:25,386 INFO L462 AbstractCegarLoop]: Abstraction has 160 states and 186 transitions. [2019-10-14 23:14:25,386 INFO L463 AbstractCegarLoop]: Interpolant automaton has 30 states. [2019-10-14 23:14:25,386 INFO L276 IsEmpty]: Start isEmpty. Operand 160 states and 186 transitions. [2019-10-14 23:14:25,389 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 160 [2019-10-14 23:14:25,389 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 23:14:25,389 INFO L380 BasicCegarLoop]: trace histogram [25, 25, 24, 24, 24, 24, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 23:14:25,598 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 23:14:25,598 INFO L410 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 23:14:25,599 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 23:14:25,599 INFO L82 PathProgramCache]: Analyzing trace with hash 1885216018, now seen corresponding path program 24 times [2019-10-14 23:14:25,599 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 23:14:25,599 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [193355091] [2019-10-14 23:14:25,600 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:14:25,600 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:14:25,600 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 23:14:25,652 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:14:26,026 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:14:26,049 INFO L134 CoverageAnalysis]: Checked inductivity of 1752 backedges. 0 proven. 1176 refuted. 0 times theorem prover too weak. 576 trivial. 0 not checked. [2019-10-14 23:14:26,050 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [193355091] [2019-10-14 23:14:26,050 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1386623057] [2019-10-14 23:14:26,050 INFO L92 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 23:14:28,783 INFO L249 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 25 check-sat command(s) [2019-10-14 23:14:28,784 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 23:14:28,788 INFO L256 TraceCheckSpWp]: Trace formula consists of 391 conjuncts, 26 conjunts are in the unsatisfiable core [2019-10-14 23:14:28,790 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 23:14:28,823 INFO L134 CoverageAnalysis]: Checked inductivity of 1752 backedges. 0 proven. 576 refuted. 0 times theorem prover too weak. 1176 trivial. 0 not checked. [2019-10-14 23:14:28,823 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 23:14:28,824 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 27] total 31 [2019-10-14 23:14:28,824 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [396059997] [2019-10-14 23:14:28,824 INFO L442 AbstractCegarLoop]: Interpolant automaton has 31 states [2019-10-14 23:14:28,825 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 23:14:28,825 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2019-10-14 23:14:28,825 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=384, Invalid=546, Unknown=0, NotChecked=0, Total=930 [2019-10-14 23:14:28,825 INFO L87 Difference]: Start difference. First operand 160 states and 186 transitions. Second operand 31 states. [2019-10-14 23:14:29,151 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 23:14:29,151 INFO L93 Difference]: Finished difference Result 276 states and 330 transitions. [2019-10-14 23:14:29,152 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2019-10-14 23:14:29,152 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 159 [2019-10-14 23:14:29,152 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 23:14:29,153 INFO L225 Difference]: With dead ends: 276 [2019-10-14 23:14:29,154 INFO L226 Difference]: Without dead ends: 168 [2019-10-14 23:14:29,155 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 191 GetRequests, 160 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 120 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=394, Invalid=662, Unknown=0, NotChecked=0, Total=1056 [2019-10-14 23:14:29,155 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 168 states. [2019-10-14 23:14:29,159 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 168 to 166. [2019-10-14 23:14:29,159 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 166 states. [2019-10-14 23:14:29,160 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 166 states to 166 states and 193 transitions. [2019-10-14 23:14:29,160 INFO L78 Accepts]: Start accepts. Automaton has 166 states and 193 transitions. Word has length 159 [2019-10-14 23:14:29,161 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 23:14:29,161 INFO L462 AbstractCegarLoop]: Abstraction has 166 states and 193 transitions. [2019-10-14 23:14:29,161 INFO L463 AbstractCegarLoop]: Interpolant automaton has 31 states. [2019-10-14 23:14:29,161 INFO L276 IsEmpty]: Start isEmpty. Operand 166 states and 193 transitions. [2019-10-14 23:14:29,162 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 166 [2019-10-14 23:14:29,162 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 23:14:29,162 INFO L380 BasicCegarLoop]: trace histogram [26, 26, 25, 25, 25, 25, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 23:14:29,368 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 23:14:29,369 INFO L410 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 23:14:29,369 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 23:14:29,369 INFO L82 PathProgramCache]: Analyzing trace with hash -1965042901, now seen corresponding path program 25 times [2019-10-14 23:14:29,369 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 23:14:29,369 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1562288159] [2019-10-14 23:14:29,369 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:14:29,370 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:14:29,370 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 23:14:29,397 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:14:29,854 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:14:29,880 INFO L134 CoverageAnalysis]: Checked inductivity of 1900 backedges. 0 proven. 1275 refuted. 0 times theorem prover too weak. 625 trivial. 0 not checked. [2019-10-14 23:14:29,880 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1562288159] [2019-10-14 23:14:29,880 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1773559167] [2019-10-14 23:14:29,881 INFO L92 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 23:14:29,986 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:14:29,988 INFO L256 TraceCheckSpWp]: Trace formula consists of 405 conjuncts, 27 conjunts are in the unsatisfiable core [2019-10-14 23:14:29,991 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 23:14:30,030 INFO L134 CoverageAnalysis]: Checked inductivity of 1900 backedges. 0 proven. 625 refuted. 0 times theorem prover too weak. 1275 trivial. 0 not checked. [2019-10-14 23:14:30,030 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 23:14:30,030 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 28] total 32 [2019-10-14 23:14:30,031 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1512700796] [2019-10-14 23:14:30,031 INFO L442 AbstractCegarLoop]: Interpolant automaton has 32 states [2019-10-14 23:14:30,031 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 23:14:30,032 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2019-10-14 23:14:30,032 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=412, Invalid=580, Unknown=0, NotChecked=0, Total=992 [2019-10-14 23:14:30,032 INFO L87 Difference]: Start difference. First operand 166 states and 193 transitions. Second operand 32 states. [2019-10-14 23:14:30,463 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 23:14:30,463 INFO L93 Difference]: Finished difference Result 286 states and 342 transitions. [2019-10-14 23:14:30,463 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2019-10-14 23:14:30,464 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 165 [2019-10-14 23:14:30,464 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 23:14:30,465 INFO L225 Difference]: With dead ends: 286 [2019-10-14 23:14:30,465 INFO L226 Difference]: Without dead ends: 174 [2019-10-14 23:14:30,466 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 198 GetRequests, 166 SyntacticMatches, 0 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 125 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=422, Invalid=700, Unknown=0, NotChecked=0, Total=1122 [2019-10-14 23:14:30,466 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 174 states. [2019-10-14 23:14:30,471 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 174 to 172. [2019-10-14 23:14:30,472 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 172 states. [2019-10-14 23:14:30,472 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 172 states to 172 states and 200 transitions. [2019-10-14 23:14:30,473 INFO L78 Accepts]: Start accepts. Automaton has 172 states and 200 transitions. Word has length 165 [2019-10-14 23:14:30,473 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 23:14:30,473 INFO L462 AbstractCegarLoop]: Abstraction has 172 states and 200 transitions. [2019-10-14 23:14:30,473 INFO L463 AbstractCegarLoop]: Interpolant automaton has 32 states. [2019-10-14 23:14:30,473 INFO L276 IsEmpty]: Start isEmpty. Operand 172 states and 200 transitions. [2019-10-14 23:14:30,474 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 172 [2019-10-14 23:14:30,475 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 23:14:30,475 INFO L380 BasicCegarLoop]: trace histogram [27, 27, 26, 26, 26, 26, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 23:14:30,679 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 23:14:30,679 INFO L410 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 23:14:30,679 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 23:14:30,680 INFO L82 PathProgramCache]: Analyzing trace with hash -581695932, now seen corresponding path program 26 times [2019-10-14 23:14:30,680 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 23:14:30,680 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1026975931] [2019-10-14 23:14:30,680 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:14:30,680 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:14:30,680 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 23:14:30,709 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:14:31,217 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:14:31,235 INFO L134 CoverageAnalysis]: Checked inductivity of 2054 backedges. 0 proven. 1378 refuted. 0 times theorem prover too weak. 676 trivial. 0 not checked. [2019-10-14 23:14:31,235 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1026975931] [2019-10-14 23:14:31,235 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [558905976] [2019-10-14 23:14:31,236 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 27 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 27 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 23:14:31,338 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-10-14 23:14:31,338 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 23:14:31,339 INFO L256 TraceCheckSpWp]: Trace formula consists of 419 conjuncts, 28 conjunts are in the unsatisfiable core [2019-10-14 23:14:31,342 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 23:14:31,378 INFO L134 CoverageAnalysis]: Checked inductivity of 2054 backedges. 0 proven. 676 refuted. 0 times theorem prover too weak. 1378 trivial. 0 not checked. [2019-10-14 23:14:31,378 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 23:14:31,378 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 29] total 33 [2019-10-14 23:14:31,378 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1982417923] [2019-10-14 23:14:31,379 INFO L442 AbstractCegarLoop]: Interpolant automaton has 33 states [2019-10-14 23:14:31,379 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 23:14:31,379 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2019-10-14 23:14:31,380 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=441, Invalid=615, Unknown=0, NotChecked=0, Total=1056 [2019-10-14 23:14:31,380 INFO L87 Difference]: Start difference. First operand 172 states and 200 transitions. Second operand 33 states. [2019-10-14 23:14:31,711 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 23:14:31,711 INFO L93 Difference]: Finished difference Result 296 states and 354 transitions. [2019-10-14 23:14:31,715 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2019-10-14 23:14:31,715 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 171 [2019-10-14 23:14:31,715 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 23:14:31,716 INFO L225 Difference]: With dead ends: 296 [2019-10-14 23:14:31,716 INFO L226 Difference]: Without dead ends: 180 [2019-10-14 23:14:31,717 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 205 GetRequests, 172 SyntacticMatches, 0 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 130 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=451, Invalid=739, Unknown=0, NotChecked=0, Total=1190 [2019-10-14 23:14:31,717 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 180 states. [2019-10-14 23:14:31,721 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 180 to 178. [2019-10-14 23:14:31,721 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 178 states. [2019-10-14 23:14:31,722 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 178 states to 178 states and 207 transitions. [2019-10-14 23:14:31,722 INFO L78 Accepts]: Start accepts. Automaton has 178 states and 207 transitions. Word has length 171 [2019-10-14 23:14:31,722 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 23:14:31,722 INFO L462 AbstractCegarLoop]: Abstraction has 178 states and 207 transitions. [2019-10-14 23:14:31,722 INFO L463 AbstractCegarLoop]: Interpolant automaton has 33 states. [2019-10-14 23:14:31,722 INFO L276 IsEmpty]: Start isEmpty. Operand 178 states and 207 transitions. [2019-10-14 23:14:31,723 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 178 [2019-10-14 23:14:31,723 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 23:14:31,723 INFO L380 BasicCegarLoop]: trace histogram [28, 28, 27, 27, 27, 27, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 23:14:31,924 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 23:14:31,924 INFO L410 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 23:14:31,924 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 23:14:31,925 INFO L82 PathProgramCache]: Analyzing trace with hash -1964435875, now seen corresponding path program 27 times [2019-10-14 23:14:31,925 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 23:14:31,925 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1435704345] [2019-10-14 23:14:31,926 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:14:31,926 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:14:31,926 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 23:14:31,955 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:14:32,450 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:14:32,487 INFO L134 CoverageAnalysis]: Checked inductivity of 2214 backedges. 0 proven. 1485 refuted. 0 times theorem prover too weak. 729 trivial. 0 not checked. [2019-10-14 23:14:32,487 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1435704345] [2019-10-14 23:14:32,487 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1595546287] [2019-10-14 23:14:32,487 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 23:14:33,958 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 28 check-sat command(s) [2019-10-14 23:14:33,959 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 23:14:33,964 INFO L256 TraceCheckSpWp]: Trace formula consists of 433 conjuncts, 29 conjunts are in the unsatisfiable core [2019-10-14 23:14:33,967 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 23:14:34,007 INFO L134 CoverageAnalysis]: Checked inductivity of 2214 backedges. 0 proven. 729 refuted. 0 times theorem prover too weak. 1485 trivial. 0 not checked. [2019-10-14 23:14:34,008 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 23:14:34,008 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 30] total 34 [2019-10-14 23:14:34,008 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [632897025] [2019-10-14 23:14:34,009 INFO L442 AbstractCegarLoop]: Interpolant automaton has 34 states [2019-10-14 23:14:34,009 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 23:14:34,009 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2019-10-14 23:14:34,010 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=471, Invalid=651, Unknown=0, NotChecked=0, Total=1122 [2019-10-14 23:14:34,010 INFO L87 Difference]: Start difference. First operand 178 states and 207 transitions. Second operand 34 states. [2019-10-14 23:14:34,410 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 23:14:34,410 INFO L93 Difference]: Finished difference Result 306 states and 366 transitions. [2019-10-14 23:14:34,411 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2019-10-14 23:14:34,411 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 177 [2019-10-14 23:14:34,411 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 23:14:34,412 INFO L225 Difference]: With dead ends: 306 [2019-10-14 23:14:34,412 INFO L226 Difference]: Without dead ends: 186 [2019-10-14 23:14:34,414 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 212 GetRequests, 178 SyntacticMatches, 0 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 135 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=481, Invalid=779, Unknown=0, NotChecked=0, Total=1260 [2019-10-14 23:14:34,414 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 186 states. [2019-10-14 23:14:34,418 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 186 to 184. [2019-10-14 23:14:34,418 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 184 states. [2019-10-14 23:14:34,419 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 184 states to 184 states and 214 transitions. [2019-10-14 23:14:34,419 INFO L78 Accepts]: Start accepts. Automaton has 184 states and 214 transitions. Word has length 177 [2019-10-14 23:14:34,420 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 23:14:34,420 INFO L462 AbstractCegarLoop]: Abstraction has 184 states and 214 transitions. [2019-10-14 23:14:34,420 INFO L463 AbstractCegarLoop]: Interpolant automaton has 34 states. [2019-10-14 23:14:34,420 INFO L276 IsEmpty]: Start isEmpty. Operand 184 states and 214 transitions. [2019-10-14 23:14:34,421 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 184 [2019-10-14 23:14:34,421 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 23:14:34,421 INFO L380 BasicCegarLoop]: trace histogram [29, 29, 28, 28, 28, 28, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 23:14:34,627 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 23:14:34,627 INFO L410 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 23:14:34,628 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 23:14:34,628 INFO L82 PathProgramCache]: Analyzing trace with hash 1433756534, now seen corresponding path program 28 times [2019-10-14 23:14:34,628 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 23:14:34,628 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1531361918] [2019-10-14 23:14:34,628 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:14:34,629 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:14:34,629 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 23:14:34,655 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:14:35,134 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:14:35,154 INFO L134 CoverageAnalysis]: Checked inductivity of 2380 backedges. 0 proven. 1596 refuted. 0 times theorem prover too weak. 784 trivial. 0 not checked. [2019-10-14 23:14:35,154 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1531361918] [2019-10-14 23:14:35,154 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [863438866] [2019-10-14 23:14:35,155 INFO L92 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 29 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 29 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 23:14:35,267 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-10-14 23:14:35,267 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 23:14:35,269 INFO L256 TraceCheckSpWp]: Trace formula consists of 447 conjuncts, 30 conjunts are in the unsatisfiable core [2019-10-14 23:14:35,271 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 23:14:35,312 INFO L134 CoverageAnalysis]: Checked inductivity of 2380 backedges. 0 proven. 784 refuted. 0 times theorem prover too weak. 1596 trivial. 0 not checked. [2019-10-14 23:14:35,313 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 23:14:35,313 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 31] total 35 [2019-10-14 23:14:35,313 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [914806709] [2019-10-14 23:14:35,314 INFO L442 AbstractCegarLoop]: Interpolant automaton has 35 states [2019-10-14 23:14:35,314 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 23:14:35,314 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2019-10-14 23:14:35,315 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=502, Invalid=688, Unknown=0, NotChecked=0, Total=1190 [2019-10-14 23:14:35,315 INFO L87 Difference]: Start difference. First operand 184 states and 214 transitions. Second operand 35 states. [2019-10-14 23:14:35,732 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 23:14:35,733 INFO L93 Difference]: Finished difference Result 316 states and 378 transitions. [2019-10-14 23:14:35,733 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2019-10-14 23:14:35,733 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 183 [2019-10-14 23:14:35,734 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 23:14:35,735 INFO L225 Difference]: With dead ends: 316 [2019-10-14 23:14:35,735 INFO L226 Difference]: Without dead ends: 192 [2019-10-14 23:14:35,736 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 219 GetRequests, 184 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 140 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=512, Invalid=820, Unknown=0, NotChecked=0, Total=1332 [2019-10-14 23:14:35,736 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 192 states. [2019-10-14 23:14:35,740 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 192 to 190. [2019-10-14 23:14:35,740 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 190 states. [2019-10-14 23:14:35,741 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 190 states to 190 states and 221 transitions. [2019-10-14 23:14:35,741 INFO L78 Accepts]: Start accepts. Automaton has 190 states and 221 transitions. Word has length 183 [2019-10-14 23:14:35,741 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 23:14:35,741 INFO L462 AbstractCegarLoop]: Abstraction has 190 states and 221 transitions. [2019-10-14 23:14:35,741 INFO L463 AbstractCegarLoop]: Interpolant automaton has 35 states. [2019-10-14 23:14:35,741 INFO L276 IsEmpty]: Start isEmpty. Operand 190 states and 221 transitions. [2019-10-14 23:14:35,742 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 190 [2019-10-14 23:14:35,742 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 23:14:35,743 INFO L380 BasicCegarLoop]: trace histogram [30, 30, 29, 29, 29, 29, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 23:14:35,947 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 29 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 23:14:35,947 INFO L410 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 23:14:35,947 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 23:14:35,948 INFO L82 PathProgramCache]: Analyzing trace with hash 125259151, now seen corresponding path program 29 times [2019-10-14 23:14:35,948 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 23:14:35,948 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [482200126] [2019-10-14 23:14:35,948 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:14:35,949 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:14:35,949 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 23:14:35,974 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:14:36,425 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:14:36,448 INFO L134 CoverageAnalysis]: Checked inductivity of 2552 backedges. 0 proven. 1711 refuted. 0 times theorem prover too weak. 841 trivial. 0 not checked. [2019-10-14 23:14:36,449 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [482200126] [2019-10-14 23:14:36,449 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [872367193] [2019-10-14 23:14:36,449 INFO L92 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 23:14:38,212 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 30 check-sat command(s) [2019-10-14 23:14:38,212 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 23:14:38,218 INFO L256 TraceCheckSpWp]: Trace formula consists of 461 conjuncts, 31 conjunts are in the unsatisfiable core [2019-10-14 23:14:38,221 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 23:14:38,278 INFO L134 CoverageAnalysis]: Checked inductivity of 2552 backedges. 0 proven. 841 refuted. 0 times theorem prover too weak. 1711 trivial. 0 not checked. [2019-10-14 23:14:38,278 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 23:14:38,279 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 32] total 36 [2019-10-14 23:14:38,279 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [592987129] [2019-10-14 23:14:38,279 INFO L442 AbstractCegarLoop]: Interpolant automaton has 36 states [2019-10-14 23:14:38,280 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 23:14:38,280 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2019-10-14 23:14:38,280 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=534, Invalid=726, Unknown=0, NotChecked=0, Total=1260 [2019-10-14 23:14:38,280 INFO L87 Difference]: Start difference. First operand 190 states and 221 transitions. Second operand 36 states. [2019-10-14 23:14:38,696 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 23:14:38,696 INFO L93 Difference]: Finished difference Result 326 states and 390 transitions. [2019-10-14 23:14:38,696 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2019-10-14 23:14:38,696 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 189 [2019-10-14 23:14:38,696 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 23:14:38,697 INFO L225 Difference]: With dead ends: 326 [2019-10-14 23:14:38,697 INFO L226 Difference]: Without dead ends: 198 [2019-10-14 23:14:38,699 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 226 GetRequests, 190 SyntacticMatches, 0 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 145 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=544, Invalid=862, Unknown=0, NotChecked=0, Total=1406 [2019-10-14 23:14:38,699 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 198 states. [2019-10-14 23:14:38,705 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 198 to 196. [2019-10-14 23:14:38,706 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 196 states. [2019-10-14 23:14:38,707 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 196 states to 196 states and 228 transitions. [2019-10-14 23:14:38,708 INFO L78 Accepts]: Start accepts. Automaton has 196 states and 228 transitions. Word has length 189 [2019-10-14 23:14:38,708 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 23:14:38,708 INFO L462 AbstractCegarLoop]: Abstraction has 196 states and 228 transitions. [2019-10-14 23:14:38,709 INFO L463 AbstractCegarLoop]: Interpolant automaton has 36 states. [2019-10-14 23:14:38,709 INFO L276 IsEmpty]: Start isEmpty. Operand 196 states and 228 transitions. [2019-10-14 23:14:38,710 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 196 [2019-10-14 23:14:38,711 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 23:14:38,711 INFO L380 BasicCegarLoop]: trace histogram [31, 31, 30, 30, 30, 30, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 23:14:38,920 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 30 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 23:14:38,920 INFO L410 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 23:14:38,920 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 23:14:38,921 INFO L82 PathProgramCache]: Analyzing trace with hash 1578448040, now seen corresponding path program 30 times [2019-10-14 23:14:38,921 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 23:14:38,921 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [670510818] [2019-10-14 23:14:38,921 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:14:38,922 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:14:38,922 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 23:14:38,971 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:14:39,584 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:14:39,621 INFO L134 CoverageAnalysis]: Checked inductivity of 2730 backedges. 0 proven. 1830 refuted. 0 times theorem prover too weak. 900 trivial. 0 not checked. [2019-10-14 23:14:39,621 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [670510818] [2019-10-14 23:14:39,622 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1387136219] [2019-10-14 23:14:39,622 INFO L92 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 31 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 31 with z3 -smt2 -in SMTLIB2_COMPLIANT=true