java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/array-examples/standard_init4_ground-1.i -------------------------------------------------------------------------------- This is Ultimate 0.1.24-13a467a-m [2019-10-14 21:45:01,220 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-10-14 21:45:01,222 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-10-14 21:45:01,234 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2019-10-14 21:45:01,235 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2019-10-14 21:45:01,236 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2019-10-14 21:45:01,237 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2019-10-14 21:45:01,239 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2019-10-14 21:45:01,241 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2019-10-14 21:45:01,242 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2019-10-14 21:45:01,243 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2019-10-14 21:45:01,244 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2019-10-14 21:45:01,245 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-10-14 21:45:01,246 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-10-14 21:45:01,247 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-10-14 21:45:01,248 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-10-14 21:45:01,249 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-10-14 21:45:01,250 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-10-14 21:45:01,251 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-10-14 21:45:01,253 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-10-14 21:45:01,255 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-10-14 21:45:01,256 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-10-14 21:45:01,257 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-10-14 21:45:01,258 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-10-14 21:45:01,260 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2019-10-14 21:45:01,263 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2019-10-14 21:45:01,264 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2019-10-14 21:45:01,265 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2019-10-14 21:45:01,266 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2019-10-14 21:45:01,267 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2019-10-14 21:45:01,267 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2019-10-14 21:45:01,268 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2019-10-14 21:45:01,268 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2019-10-14 21:45:01,268 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-10-14 21:45:01,270 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-10-14 21:45:01,271 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-10-14 21:45:01,272 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 21:45:01,297 INFO L113 SettingsManager]: Loading preferences was successful [2019-10-14 21:45:01,298 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-10-14 21:45:01,300 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2019-10-14 21:45:01,300 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2019-10-14 21:45:01,300 INFO L138 SettingsManager]: * Use SBE=true [2019-10-14 21:45:01,300 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-10-14 21:45:01,300 INFO L138 SettingsManager]: * sizeof long=4 [2019-10-14 21:45:01,301 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2019-10-14 21:45:01,301 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-10-14 21:45:01,301 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-10-14 21:45:01,302 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-10-14 21:45:01,302 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-10-14 21:45:01,303 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-10-14 21:45:01,303 INFO L138 SettingsManager]: * sizeof long double=12 [2019-10-14 21:45:01,303 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-10-14 21:45:01,304 INFO L138 SettingsManager]: * Use constant arrays=true [2019-10-14 21:45:01,304 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-10-14 21:45:01,304 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-10-14 21:45:01,304 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-10-14 21:45:01,304 INFO L138 SettingsManager]: * To the following directory=./dump/ [2019-10-14 21:45:01,305 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2019-10-14 21:45:01,305 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-10-14 21:45:01,306 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-10-14 21:45:01,306 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-10-14 21:45:01,306 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-10-14 21:45:01,306 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2019-10-14 21:45:01,307 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-10-14 21:45:01,307 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-10-14 21:45:01,307 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2019-10-14 21:45:01,635 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-10-14 21:45:01,648 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-10-14 21:45:01,652 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-10-14 21:45:01,653 INFO L271 PluginConnector]: Initializing CDTParser... [2019-10-14 21:45:01,653 INFO L275 PluginConnector]: CDTParser initialized [2019-10-14 21:45:01,654 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/array-examples/standard_init4_ground-1.i [2019-10-14 21:45:01,739 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/110f3efd9/8788ac4b7e414efaaaa11336be9e1c34/FLAG452666b21 [2019-10-14 21:45:02,227 INFO L306 CDTParser]: Found 1 translation units. [2019-10-14 21:45:02,228 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/array-examples/standard_init4_ground-1.i [2019-10-14 21:45:02,235 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/110f3efd9/8788ac4b7e414efaaaa11336be9e1c34/FLAG452666b21 [2019-10-14 21:45:02,589 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/110f3efd9/8788ac4b7e414efaaaa11336be9e1c34 [2019-10-14 21:45:02,599 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-10-14 21:45:02,601 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2019-10-14 21:45:02,602 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-10-14 21:45:02,602 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-10-14 21:45:02,606 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-10-14 21:45:02,607 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 14.10 09:45:02" (1/1) ... [2019-10-14 21:45:02,610 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@1aa87bfe and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 09:45:02, skipping insertion in model container [2019-10-14 21:45:02,611 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 14.10 09:45:02" (1/1) ... [2019-10-14 21:45:02,618 INFO L142 MainTranslator]: Starting translation in SV-COMP mode [2019-10-14 21:45:02,636 INFO L173 MainTranslator]: Built tables and reachable declarations [2019-10-14 21:45:02,860 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-10-14 21:45:02,864 INFO L188 MainTranslator]: Completed pre-run [2019-10-14 21:45:02,890 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-10-14 21:45:02,911 INFO L192 MainTranslator]: Completed translation [2019-10-14 21:45:02,911 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 09:45:02 WrapperNode [2019-10-14 21:45:02,911 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-10-14 21:45:02,912 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-10-14 21:45:02,912 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-10-14 21:45:02,913 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-10-14 21:45:03,021 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 09:45:02" (1/1) ... [2019-10-14 21:45:03,022 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 09:45:02" (1/1) ... [2019-10-14 21:45:03,029 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 09:45:02" (1/1) ... [2019-10-14 21:45:03,029 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 09:45:02" (1/1) ... [2019-10-14 21:45:03,036 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 09:45:02" (1/1) ... [2019-10-14 21:45:03,045 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 09:45:02" (1/1) ... [2019-10-14 21:45:03,046 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 09:45:02" (1/1) ... [2019-10-14 21:45:03,048 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-10-14 21:45:03,049 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-10-14 21:45:03,049 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-10-14 21:45:03,049 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-10-14 21:45:03,050 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 09:45:02" (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 21:45:03,113 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2019-10-14 21:45:03,113 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-10-14 21:45:03,113 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2019-10-14 21:45:03,113 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2019-10-14 21:45:03,114 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2019-10-14 21:45:03,114 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2019-10-14 21:45:03,114 INFO L130 BoogieDeclarations]: Found specification of procedure main [2019-10-14 21:45:03,114 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2019-10-14 21:45:03,114 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2019-10-14 21:45:03,114 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2019-10-14 21:45:03,114 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2019-10-14 21:45:03,115 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2019-10-14 21:45:03,115 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-10-14 21:45:03,335 INFO L279 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-10-14 21:45:03,336 INFO L284 CfgBuilder]: Removed 5 assume(true) statements. [2019-10-14 21:45:03,337 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 14.10 09:45:03 BoogieIcfgContainer [2019-10-14 21:45:03,337 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-10-14 21:45:03,339 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-10-14 21:45:03,339 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-10-14 21:45:03,342 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-10-14 21:45:03,342 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 14.10 09:45:02" (1/3) ... [2019-10-14 21:45:03,343 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4fc86d7e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 14.10 09:45:03, skipping insertion in model container [2019-10-14 21:45:03,343 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 09:45:02" (2/3) ... [2019-10-14 21:45:03,344 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4fc86d7e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 14.10 09:45:03, skipping insertion in model container [2019-10-14 21:45:03,344 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 14.10 09:45:03" (3/3) ... [2019-10-14 21:45:03,346 INFO L109 eAbstractionObserver]: Analyzing ICFG standard_init4_ground-1.i [2019-10-14 21:45:03,356 INFO L152 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-10-14 21:45:03,364 INFO L164 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-10-14 21:45:03,376 INFO L249 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-10-14 21:45:03,407 INFO L373 AbstractCegarLoop]: Interprodecural is true [2019-10-14 21:45:03,407 INFO L374 AbstractCegarLoop]: Hoare is true [2019-10-14 21:45:03,408 INFO L375 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-10-14 21:45:03,408 INFO L376 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-10-14 21:45:03,408 INFO L377 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-10-14 21:45:03,409 INFO L378 AbstractCegarLoop]: Difference is false [2019-10-14 21:45:03,409 INFO L379 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-10-14 21:45:03,409 INFO L383 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-10-14 21:45:03,443 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states. [2019-10-14 21:45:03,452 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2019-10-14 21:45:03,452 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:45:03,454 INFO L380 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:45:03,458 INFO L410 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:45:03,466 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:45:03,467 INFO L82 PathProgramCache]: Analyzing trace with hash -1568614638, now seen corresponding path program 1 times [2019-10-14 21:45:03,477 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:45:03,477 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1510838014] [2019-10-14 21:45:03,477 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:45:03,478 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:45:03,478 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:45:03,582 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:45:03,646 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:45:03,656 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 21:45:03,656 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1510838014] [2019-10-14 21:45:03,657 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-10-14 21:45:03,658 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2019-10-14 21:45:03,658 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1260372868] [2019-10-14 21:45:03,663 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-10-14 21:45:03,664 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:45:03,677 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-10-14 21:45:03,678 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-10-14 21:45:03,681 INFO L87 Difference]: Start difference. First operand 29 states. Second operand 3 states. [2019-10-14 21:45:03,805 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:45:03,805 INFO L93 Difference]: Finished difference Result 51 states and 70 transitions. [2019-10-14 21:45:03,806 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-10-14 21:45:03,807 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 19 [2019-10-14 21:45:03,808 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:45:03,814 INFO L225 Difference]: With dead ends: 51 [2019-10-14 21:45:03,815 INFO L226 Difference]: Without dead ends: 24 [2019-10-14 21:45:03,818 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 21:45:03,837 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2019-10-14 21:45:03,857 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2019-10-14 21:45:03,858 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2019-10-14 21:45:03,861 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 28 transitions. [2019-10-14 21:45:03,862 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 28 transitions. Word has length 19 [2019-10-14 21:45:03,863 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:45:03,863 INFO L462 AbstractCegarLoop]: Abstraction has 24 states and 28 transitions. [2019-10-14 21:45:03,863 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-10-14 21:45:03,864 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 28 transitions. [2019-10-14 21:45:03,865 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2019-10-14 21:45:03,865 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:45:03,865 INFO L380 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:45:03,865 INFO L410 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:45:03,866 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:45:03,866 INFO L82 PathProgramCache]: Analyzing trace with hash -395002610, now seen corresponding path program 1 times [2019-10-14 21:45:03,866 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:45:03,867 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1185851754] [2019-10-14 21:45:03,867 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:45:03,867 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:45:03,867 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:45:03,885 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:45:03,943 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:45:03,952 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 21:45:03,953 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1185851754] [2019-10-14 21:45:03,953 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-10-14 21:45:03,953 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2019-10-14 21:45:03,954 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [942517496] [2019-10-14 21:45:03,956 INFO L442 AbstractCegarLoop]: Interpolant automaton has 4 states [2019-10-14 21:45:03,956 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:45:03,956 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2019-10-14 21:45:03,957 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2019-10-14 21:45:03,957 INFO L87 Difference]: Start difference. First operand 24 states and 28 transitions. Second operand 4 states. [2019-10-14 21:45:04,057 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:45:04,058 INFO L93 Difference]: Finished difference Result 45 states and 56 transitions. [2019-10-14 21:45:04,058 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2019-10-14 21:45:04,058 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 19 [2019-10-14 21:45:04,059 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:45:04,060 INFO L225 Difference]: With dead ends: 45 [2019-10-14 21:45:04,060 INFO L226 Difference]: Without dead ends: 28 [2019-10-14 21:45:04,061 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 21:45:04,062 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2019-10-14 21:45:04,068 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2019-10-14 21:45:04,069 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2019-10-14 21:45:04,070 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 32 transitions. [2019-10-14 21:45:04,070 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 32 transitions. Word has length 19 [2019-10-14 21:45:04,071 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:45:04,071 INFO L462 AbstractCegarLoop]: Abstraction has 28 states and 32 transitions. [2019-10-14 21:45:04,071 INFO L463 AbstractCegarLoop]: Interpolant automaton has 4 states. [2019-10-14 21:45:04,071 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 32 transitions. [2019-10-14 21:45:04,072 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2019-10-14 21:45:04,072 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:45:04,073 INFO L380 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:45:04,073 INFO L410 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:45:04,073 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:45:04,074 INFO L82 PathProgramCache]: Analyzing trace with hash 47445068, now seen corresponding path program 1 times [2019-10-14 21:45:04,074 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:45:04,074 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [883179286] [2019-10-14 21:45:04,074 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:45:04,075 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:45:04,075 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:45:04,110 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:45:04,173 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:45:04,183 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 21:45:04,186 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [883179286] [2019-10-14 21:45:04,187 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [269786268] [2019-10-14 21:45:04,187 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 21:45:04,257 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:45:04,260 INFO L256 TraceCheckSpWp]: Trace formula consists of 77 conjuncts, 3 conjunts are in the unsatisfiable core [2019-10-14 21:45:04,272 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:45:04,307 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 21:45:04,307 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:45:04,308 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 4] total 6 [2019-10-14 21:45:04,308 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [955985227] [2019-10-14 21:45:04,309 INFO L442 AbstractCegarLoop]: Interpolant automaton has 6 states [2019-10-14 21:45:04,309 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:45:04,309 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2019-10-14 21:45:04,310 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2019-10-14 21:45:04,310 INFO L87 Difference]: Start difference. First operand 28 states and 32 transitions. Second operand 6 states. [2019-10-14 21:45:04,429 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:45:04,429 INFO L93 Difference]: Finished difference Result 52 states and 63 transitions. [2019-10-14 21:45:04,430 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2019-10-14 21:45:04,430 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 23 [2019-10-14 21:45:04,430 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:45:04,431 INFO L225 Difference]: With dead ends: 52 [2019-10-14 21:45:04,431 INFO L226 Difference]: Without dead ends: 32 [2019-10-14 21:45:04,432 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 24 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2019-10-14 21:45:04,433 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2019-10-14 21:45:04,439 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32. [2019-10-14 21:45:04,439 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2019-10-14 21:45:04,440 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 36 transitions. [2019-10-14 21:45:04,441 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 36 transitions. Word has length 23 [2019-10-14 21:45:04,441 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:45:04,441 INFO L462 AbstractCegarLoop]: Abstraction has 32 states and 36 transitions. [2019-10-14 21:45:04,441 INFO L463 AbstractCegarLoop]: Interpolant automaton has 6 states. [2019-10-14 21:45:04,441 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 36 transitions. [2019-10-14 21:45:04,442 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2019-10-14 21:45:04,442 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:45:04,443 INFO L380 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:45:04,648 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:45:04,649 INFO L410 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:45:04,649 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:45:04,649 INFO L82 PathProgramCache]: Analyzing trace with hash 1810840398, now seen corresponding path program 2 times [2019-10-14 21:45:04,650 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:45:04,650 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [524709698] [2019-10-14 21:45:04,650 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:45:04,650 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:45:04,651 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:45:04,704 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:45:04,778 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:45:04,782 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2019-10-14 21:45:04,783 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [524709698] [2019-10-14 21:45:04,783 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [589300017] [2019-10-14 21:45:04,784 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 21:45:04,855 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-10-14 21:45:04,856 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:45:04,857 INFO L256 TraceCheckSpWp]: Trace formula consists of 93 conjuncts, 4 conjunts are in the unsatisfiable core [2019-10-14 21:45:04,859 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:45:04,882 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2019-10-14 21:45:04,882 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:45:04,883 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5] total 7 [2019-10-14 21:45:04,883 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1211586185] [2019-10-14 21:45:04,884 INFO L442 AbstractCegarLoop]: Interpolant automaton has 7 states [2019-10-14 21:45:04,884 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:45:04,884 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2019-10-14 21:45:04,887 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2019-10-14 21:45:04,887 INFO L87 Difference]: Start difference. First operand 32 states and 36 transitions. Second operand 7 states. [2019-10-14 21:45:05,017 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:45:05,017 INFO L93 Difference]: Finished difference Result 59 states and 70 transitions. [2019-10-14 21:45:05,018 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2019-10-14 21:45:05,018 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 27 [2019-10-14 21:45:05,018 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:45:05,019 INFO L225 Difference]: With dead ends: 59 [2019-10-14 21:45:05,019 INFO L226 Difference]: Without dead ends: 36 [2019-10-14 21:45:05,020 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 28 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2019-10-14 21:45:05,022 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2019-10-14 21:45:05,029 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2019-10-14 21:45:05,031 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2019-10-14 21:45:05,034 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 40 transitions. [2019-10-14 21:45:05,034 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 40 transitions. Word has length 27 [2019-10-14 21:45:05,034 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:45:05,036 INFO L462 AbstractCegarLoop]: Abstraction has 36 states and 40 transitions. [2019-10-14 21:45:05,036 INFO L463 AbstractCegarLoop]: Interpolant automaton has 7 states. [2019-10-14 21:45:05,037 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 40 transitions. [2019-10-14 21:45:05,039 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2019-10-14 21:45:05,039 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:45:05,040 INFO L380 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:45:05,243 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:45:05,244 INFO L410 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:45:05,244 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:45:05,244 INFO L82 PathProgramCache]: Analyzing trace with hash -1527698548, now seen corresponding path program 3 times [2019-10-14 21:45:05,245 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:45:05,245 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [55599304] [2019-10-14 21:45:05,245 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:45:05,245 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:45:05,245 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:45:05,302 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:45:05,403 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:45:05,413 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2019-10-14 21:45:05,413 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [55599304] [2019-10-14 21:45:05,413 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2104109264] [2019-10-14 21:45:05,414 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 21:45:05,492 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2019-10-14 21:45:05,492 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:45:05,493 INFO L256 TraceCheckSpWp]: Trace formula consists of 109 conjuncts, 5 conjunts are in the unsatisfiable core [2019-10-14 21:45:05,497 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:45:05,524 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2019-10-14 21:45:05,525 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:45:05,525 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6] total 8 [2019-10-14 21:45:05,525 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1767891567] [2019-10-14 21:45:05,526 INFO L442 AbstractCegarLoop]: Interpolant automaton has 8 states [2019-10-14 21:45:05,526 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:45:05,526 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2019-10-14 21:45:05,527 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2019-10-14 21:45:05,527 INFO L87 Difference]: Start difference. First operand 36 states and 40 transitions. Second operand 8 states. [2019-10-14 21:45:05,661 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:45:05,661 INFO L93 Difference]: Finished difference Result 66 states and 77 transitions. [2019-10-14 21:45:05,662 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2019-10-14 21:45:05,662 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 31 [2019-10-14 21:45:05,662 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:45:05,663 INFO L225 Difference]: With dead ends: 66 [2019-10-14 21:45:05,663 INFO L226 Difference]: Without dead ends: 40 [2019-10-14 21:45:05,664 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 32 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2019-10-14 21:45:05,664 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2019-10-14 21:45:05,670 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 40. [2019-10-14 21:45:05,670 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2019-10-14 21:45:05,671 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 44 transitions. [2019-10-14 21:45:05,672 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 44 transitions. Word has length 31 [2019-10-14 21:45:05,672 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:45:05,672 INFO L462 AbstractCegarLoop]: Abstraction has 40 states and 44 transitions. [2019-10-14 21:45:05,672 INFO L463 AbstractCegarLoop]: Interpolant automaton has 8 states. [2019-10-14 21:45:05,672 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 44 transitions. [2019-10-14 21:45:05,673 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2019-10-14 21:45:05,673 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:45:05,674 INFO L380 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:45:05,874 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:45:05,875 INFO L410 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:45:05,875 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:45:05,875 INFO L82 PathProgramCache]: Analyzing trace with hash -1451349618, now seen corresponding path program 4 times [2019-10-14 21:45:05,875 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:45:05,876 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2045776958] [2019-10-14 21:45:05,876 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:45:05,876 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:45:05,876 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:45:05,909 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:45:05,971 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:45:05,974 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2019-10-14 21:45:05,974 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2045776958] [2019-10-14 21:45:05,975 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1631791811] [2019-10-14 21:45:05,975 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 21:45:06,028 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-10-14 21:45:06,028 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:45:06,030 INFO L256 TraceCheckSpWp]: Trace formula consists of 125 conjuncts, 6 conjunts are in the unsatisfiable core [2019-10-14 21:45:06,035 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:45:06,058 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2019-10-14 21:45:06,059 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:45:06,059 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7] total 9 [2019-10-14 21:45:06,059 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [728744559] [2019-10-14 21:45:06,060 INFO L442 AbstractCegarLoop]: Interpolant automaton has 9 states [2019-10-14 21:45:06,060 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:45:06,060 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2019-10-14 21:45:06,062 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=42, Unknown=0, NotChecked=0, Total=72 [2019-10-14 21:45:06,062 INFO L87 Difference]: Start difference. First operand 40 states and 44 transitions. Second operand 9 states. [2019-10-14 21:45:06,196 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:45:06,197 INFO L93 Difference]: Finished difference Result 73 states and 84 transitions. [2019-10-14 21:45:06,197 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2019-10-14 21:45:06,197 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 35 [2019-10-14 21:45:06,198 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:45:06,198 INFO L225 Difference]: With dead ends: 73 [2019-10-14 21:45:06,199 INFO L226 Difference]: Without dead ends: 44 [2019-10-14 21:45:06,200 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 36 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=30, Invalid=42, Unknown=0, NotChecked=0, Total=72 [2019-10-14 21:45:06,200 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2019-10-14 21:45:06,206 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 44. [2019-10-14 21:45:06,206 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2019-10-14 21:45:06,207 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 48 transitions. [2019-10-14 21:45:06,207 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 48 transitions. Word has length 35 [2019-10-14 21:45:06,208 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:45:06,208 INFO L462 AbstractCegarLoop]: Abstraction has 44 states and 48 transitions. [2019-10-14 21:45:06,208 INFO L463 AbstractCegarLoop]: Interpolant automaton has 9 states. [2019-10-14 21:45:06,208 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 48 transitions. [2019-10-14 21:45:06,209 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2019-10-14 21:45:06,210 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:45:06,211 INFO L380 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:45:06,423 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:45:06,424 INFO L410 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:45:06,424 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:45:06,424 INFO L82 PathProgramCache]: Analyzing trace with hash 2058629836, now seen corresponding path program 5 times [2019-10-14 21:45:06,425 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:45:06,425 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1998419008] [2019-10-14 21:45:06,426 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:45:06,426 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:45:06,426 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:45:06,478 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:45:06,555 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:45:06,559 INFO L134 CoverageAnalysis]: Checked inductivity of 60 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2019-10-14 21:45:06,559 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1998419008] [2019-10-14 21:45:06,560 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1983284740] [2019-10-14 21:45:06,560 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 21:45:06,868 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 4 check-sat command(s) [2019-10-14 21:45:06,868 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:45:06,871 INFO L256 TraceCheckSpWp]: Trace formula consists of 141 conjuncts, 7 conjunts are in the unsatisfiable core [2019-10-14 21:45:06,874 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:45:06,900 INFO L134 CoverageAnalysis]: Checked inductivity of 60 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2019-10-14 21:45:06,901 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:45:06,901 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8] total 10 [2019-10-14 21:45:06,902 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1659574979] [2019-10-14 21:45:06,902 INFO L442 AbstractCegarLoop]: Interpolant automaton has 10 states [2019-10-14 21:45:06,911 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:45:06,913 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2019-10-14 21:45:06,913 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=52, Unknown=0, NotChecked=0, Total=90 [2019-10-14 21:45:06,913 INFO L87 Difference]: Start difference. First operand 44 states and 48 transitions. Second operand 10 states. [2019-10-14 21:45:07,038 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:45:07,038 INFO L93 Difference]: Finished difference Result 80 states and 91 transitions. [2019-10-14 21:45:07,039 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2019-10-14 21:45:07,039 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 39 [2019-10-14 21:45:07,039 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:45:07,040 INFO L225 Difference]: With dead ends: 80 [2019-10-14 21:45:07,040 INFO L226 Difference]: Without dead ends: 48 [2019-10-14 21:45:07,041 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 40 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=38, Invalid=52, Unknown=0, NotChecked=0, Total=90 [2019-10-14 21:45:07,041 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2019-10-14 21:45:07,046 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 48. [2019-10-14 21:45:07,047 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2019-10-14 21:45:07,048 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 52 transitions. [2019-10-14 21:45:07,048 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 52 transitions. Word has length 39 [2019-10-14 21:45:07,048 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:45:07,048 INFO L462 AbstractCegarLoop]: Abstraction has 48 states and 52 transitions. [2019-10-14 21:45:07,048 INFO L463 AbstractCegarLoop]: Interpolant automaton has 10 states. [2019-10-14 21:45:07,049 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 52 transitions. [2019-10-14 21:45:07,050 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2019-10-14 21:45:07,050 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:45:07,050 INFO L380 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:45:07,255 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:45:07,258 INFO L410 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:45:07,258 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:45:07,258 INFO L82 PathProgramCache]: Analyzing trace with hash 1129940942, now seen corresponding path program 6 times [2019-10-14 21:45:07,259 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:45:07,259 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1136560413] [2019-10-14 21:45:07,259 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:45:07,259 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:45:07,259 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:45:07,303 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:45:07,399 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:45:07,404 INFO L134 CoverageAnalysis]: Checked inductivity of 84 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 63 trivial. 0 not checked. [2019-10-14 21:45:07,404 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1136560413] [2019-10-14 21:45:07,405 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [417143816] [2019-10-14 21:45:07,405 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 21:45:07,709 INFO L249 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 4 check-sat command(s) [2019-10-14 21:45:07,710 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:45:07,711 INFO L256 TraceCheckSpWp]: Trace formula consists of 157 conjuncts, 8 conjunts are in the unsatisfiable core [2019-10-14 21:45:07,714 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:45:07,739 INFO L134 CoverageAnalysis]: Checked inductivity of 84 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 63 trivial. 0 not checked. [2019-10-14 21:45:07,739 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:45:07,740 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9] total 11 [2019-10-14 21:45:07,741 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1788968733] [2019-10-14 21:45:07,742 INFO L442 AbstractCegarLoop]: Interpolant automaton has 11 states [2019-10-14 21:45:07,743 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:45:07,743 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2019-10-14 21:45:07,746 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=63, Unknown=0, NotChecked=0, Total=110 [2019-10-14 21:45:07,746 INFO L87 Difference]: Start difference. First operand 48 states and 52 transitions. Second operand 11 states. [2019-10-14 21:45:07,858 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:45:07,858 INFO L93 Difference]: Finished difference Result 87 states and 98 transitions. [2019-10-14 21:45:07,858 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2019-10-14 21:45:07,859 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 43 [2019-10-14 21:45:07,859 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:45:07,860 INFO L225 Difference]: With dead ends: 87 [2019-10-14 21:45:07,860 INFO L226 Difference]: Without dead ends: 52 [2019-10-14 21:45:07,860 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 44 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=47, Invalid=63, Unknown=0, NotChecked=0, Total=110 [2019-10-14 21:45:07,861 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2019-10-14 21:45:07,872 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 52. [2019-10-14 21:45:07,872 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 52 states. [2019-10-14 21:45:07,873 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 56 transitions. [2019-10-14 21:45:07,873 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 56 transitions. Word has length 43 [2019-10-14 21:45:07,873 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:45:07,874 INFO L462 AbstractCegarLoop]: Abstraction has 52 states and 56 transitions. [2019-10-14 21:45:07,874 INFO L463 AbstractCegarLoop]: Interpolant automaton has 11 states. [2019-10-14 21:45:07,874 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 56 transitions. [2019-10-14 21:45:07,875 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2019-10-14 21:45:07,875 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:45:07,875 INFO L380 BasicCegarLoop]: trace histogram [7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:45:08,086 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:45:08,086 INFO L410 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:45:08,087 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:45:08,087 INFO L82 PathProgramCache]: Analyzing trace with hash -2092627444, now seen corresponding path program 7 times [2019-10-14 21:45:08,087 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:45:08,088 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [355502135] [2019-10-14 21:45:08,088 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:45:08,088 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:45:08,088 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:45:08,117 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:45:08,213 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:45:08,217 INFO L134 CoverageAnalysis]: Checked inductivity of 112 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2019-10-14 21:45:08,218 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [355502135] [2019-10-14 21:45:08,218 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1265306095] [2019-10-14 21:45:08,218 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 21:45:08,277 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:45:08,278 INFO L256 TraceCheckSpWp]: Trace formula consists of 173 conjuncts, 9 conjunts are in the unsatisfiable core [2019-10-14 21:45:08,281 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:45:08,297 INFO L134 CoverageAnalysis]: Checked inductivity of 112 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2019-10-14 21:45:08,297 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:45:08,297 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 10] total 12 [2019-10-14 21:45:08,298 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1308179592] [2019-10-14 21:45:08,298 INFO L442 AbstractCegarLoop]: Interpolant automaton has 12 states [2019-10-14 21:45:08,298 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:45:08,299 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2019-10-14 21:45:08,299 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=75, Unknown=0, NotChecked=0, Total=132 [2019-10-14 21:45:08,299 INFO L87 Difference]: Start difference. First operand 52 states and 56 transitions. Second operand 12 states. [2019-10-14 21:45:08,457 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:45:08,457 INFO L93 Difference]: Finished difference Result 94 states and 105 transitions. [2019-10-14 21:45:08,458 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2019-10-14 21:45:08,458 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 47 [2019-10-14 21:45:08,458 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:45:08,459 INFO L225 Difference]: With dead ends: 94 [2019-10-14 21:45:08,459 INFO L226 Difference]: Without dead ends: 56 [2019-10-14 21:45:08,460 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 48 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=57, Invalid=75, Unknown=0, NotChecked=0, Total=132 [2019-10-14 21:45:08,460 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2019-10-14 21:45:08,470 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 56. [2019-10-14 21:45:08,471 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2019-10-14 21:45:08,473 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 60 transitions. [2019-10-14 21:45:08,473 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 60 transitions. Word has length 47 [2019-10-14 21:45:08,473 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:45:08,473 INFO L462 AbstractCegarLoop]: Abstraction has 56 states and 60 transitions. [2019-10-14 21:45:08,473 INFO L463 AbstractCegarLoop]: Interpolant automaton has 12 states. [2019-10-14 21:45:08,474 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 60 transitions. [2019-10-14 21:45:08,477 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2019-10-14 21:45:08,478 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:45:08,478 INFO L380 BasicCegarLoop]: trace histogram [8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:45:08,678 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:45:08,679 INFO L410 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:45:08,680 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:45:08,680 INFO L82 PathProgramCache]: Analyzing trace with hash 2092520974, now seen corresponding path program 8 times [2019-10-14 21:45:08,680 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:45:08,681 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [756175767] [2019-10-14 21:45:08,681 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:45:08,681 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:45:08,681 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:45:08,723 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:45:08,861 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:45:08,865 INFO L134 CoverageAnalysis]: Checked inductivity of 144 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 108 trivial. 0 not checked. [2019-10-14 21:45:08,866 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [756175767] [2019-10-14 21:45:08,866 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [683198891] [2019-10-14 21:45:08,866 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 21:45:08,922 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-10-14 21:45:08,922 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:45:08,923 INFO L256 TraceCheckSpWp]: Trace formula consists of 189 conjuncts, 10 conjunts are in the unsatisfiable core [2019-10-14 21:45:08,935 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:45:08,961 INFO L134 CoverageAnalysis]: Checked inductivity of 144 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 108 trivial. 0 not checked. [2019-10-14 21:45:08,962 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:45:08,962 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 11] total 13 [2019-10-14 21:45:08,962 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1025807847] [2019-10-14 21:45:08,963 INFO L442 AbstractCegarLoop]: Interpolant automaton has 13 states [2019-10-14 21:45:08,963 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:45:08,963 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2019-10-14 21:45:08,964 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=88, Unknown=0, NotChecked=0, Total=156 [2019-10-14 21:45:08,964 INFO L87 Difference]: Start difference. First operand 56 states and 60 transitions. Second operand 13 states. [2019-10-14 21:45:09,107 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:45:09,107 INFO L93 Difference]: Finished difference Result 101 states and 112 transitions. [2019-10-14 21:45:09,107 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2019-10-14 21:45:09,108 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 51 [2019-10-14 21:45:09,108 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:45:09,108 INFO L225 Difference]: With dead ends: 101 [2019-10-14 21:45:09,108 INFO L226 Difference]: Without dead ends: 60 [2019-10-14 21:45:09,109 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 63 GetRequests, 52 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=68, Invalid=88, Unknown=0, NotChecked=0, Total=156 [2019-10-14 21:45:09,110 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2019-10-14 21:45:09,117 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 60. [2019-10-14 21:45:09,117 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 60 states. [2019-10-14 21:45:09,119 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 64 transitions. [2019-10-14 21:45:09,119 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 64 transitions. Word has length 51 [2019-10-14 21:45:09,119 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:45:09,119 INFO L462 AbstractCegarLoop]: Abstraction has 60 states and 64 transitions. [2019-10-14 21:45:09,119 INFO L463 AbstractCegarLoop]: Interpolant automaton has 13 states. [2019-10-14 21:45:09,120 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 64 transitions. [2019-10-14 21:45:09,120 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2019-10-14 21:45:09,120 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:45:09,120 INFO L380 BasicCegarLoop]: trace histogram [9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:45:09,326 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:45:09,327 INFO L410 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:45:09,327 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:45:09,327 INFO L82 PathProgramCache]: Analyzing trace with hash 1825288524, now seen corresponding path program 9 times [2019-10-14 21:45:09,327 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:45:09,327 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [564721875] [2019-10-14 21:45:09,327 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:45:09,327 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:45:09,328 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:45:09,351 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:45:09,470 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:45:09,474 INFO L134 CoverageAnalysis]: Checked inductivity of 180 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 135 trivial. 0 not checked. [2019-10-14 21:45:09,474 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [564721875] [2019-10-14 21:45:09,474 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [677515203] [2019-10-14 21:45:09,475 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 21:45:12,647 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2019-10-14 21:45:12,648 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:45:12,651 INFO L256 TraceCheckSpWp]: Trace formula consists of 205 conjuncts, 11 conjunts are in the unsatisfiable core [2019-10-14 21:45:12,654 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:45:12,676 INFO L134 CoverageAnalysis]: Checked inductivity of 180 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 135 trivial. 0 not checked. [2019-10-14 21:45:12,676 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:45:12,676 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12] total 14 [2019-10-14 21:45:12,676 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2046853683] [2019-10-14 21:45:12,677 INFO L442 AbstractCegarLoop]: Interpolant automaton has 14 states [2019-10-14 21:45:12,677 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:45:12,677 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2019-10-14 21:45:12,678 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=80, Invalid=102, Unknown=0, NotChecked=0, Total=182 [2019-10-14 21:45:12,678 INFO L87 Difference]: Start difference. First operand 60 states and 64 transitions. Second operand 14 states. [2019-10-14 21:45:12,809 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:45:12,809 INFO L93 Difference]: Finished difference Result 108 states and 119 transitions. [2019-10-14 21:45:12,810 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2019-10-14 21:45:12,810 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 55 [2019-10-14 21:45:12,810 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:45:12,810 INFO L225 Difference]: With dead ends: 108 [2019-10-14 21:45:12,811 INFO L226 Difference]: Without dead ends: 64 [2019-10-14 21:45:12,811 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 68 GetRequests, 56 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=80, Invalid=102, Unknown=0, NotChecked=0, Total=182 [2019-10-14 21:45:12,812 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2019-10-14 21:45:12,817 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 64. [2019-10-14 21:45:12,817 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 64 states. [2019-10-14 21:45:12,818 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 68 transitions. [2019-10-14 21:45:12,818 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 68 transitions. Word has length 55 [2019-10-14 21:45:12,819 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:45:12,819 INFO L462 AbstractCegarLoop]: Abstraction has 64 states and 68 transitions. [2019-10-14 21:45:12,819 INFO L463 AbstractCegarLoop]: Interpolant automaton has 14 states. [2019-10-14 21:45:12,819 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 68 transitions. [2019-10-14 21:45:12,820 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2019-10-14 21:45:12,820 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:45:12,820 INFO L380 BasicCegarLoop]: trace histogram [10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:45:13,027 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:45:13,028 INFO L410 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:45:13,028 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:45:13,028 INFO L82 PathProgramCache]: Analyzing trace with hash -1177185202, now seen corresponding path program 10 times [2019-10-14 21:45:13,029 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:45:13,029 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [99141961] [2019-10-14 21:45:13,029 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:45:13,030 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:45:13,030 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:45:13,054 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:45:13,181 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:45:13,186 INFO L134 CoverageAnalysis]: Checked inductivity of 220 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 165 trivial. 0 not checked. [2019-10-14 21:45:13,186 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [99141961] [2019-10-14 21:45:13,186 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [767837551] [2019-10-14 21:45:13,186 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 21:45:13,262 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-10-14 21:45:13,262 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:45:13,264 INFO L256 TraceCheckSpWp]: Trace formula consists of 221 conjuncts, 12 conjunts are in the unsatisfiable core [2019-10-14 21:45:13,267 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:45:13,298 INFO L134 CoverageAnalysis]: Checked inductivity of 220 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 165 trivial. 0 not checked. [2019-10-14 21:45:13,298 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:45:13,298 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13] total 15 [2019-10-14 21:45:13,299 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1850149447] [2019-10-14 21:45:13,300 INFO L442 AbstractCegarLoop]: Interpolant automaton has 15 states [2019-10-14 21:45:13,300 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:45:13,300 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2019-10-14 21:45:13,300 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=117, Unknown=0, NotChecked=0, Total=210 [2019-10-14 21:45:13,301 INFO L87 Difference]: Start difference. First operand 64 states and 68 transitions. Second operand 15 states. [2019-10-14 21:45:13,521 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:45:13,521 INFO L93 Difference]: Finished difference Result 115 states and 126 transitions. [2019-10-14 21:45:13,522 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2019-10-14 21:45:13,522 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 59 [2019-10-14 21:45:13,523 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:45:13,523 INFO L225 Difference]: With dead ends: 115 [2019-10-14 21:45:13,524 INFO L226 Difference]: Without dead ends: 68 [2019-10-14 21:45:13,525 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 73 GetRequests, 60 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=93, Invalid=117, Unknown=0, NotChecked=0, Total=210 [2019-10-14 21:45:13,525 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2019-10-14 21:45:13,531 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 68. [2019-10-14 21:45:13,531 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 68 states. [2019-10-14 21:45:13,532 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 72 transitions. [2019-10-14 21:45:13,532 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 72 transitions. Word has length 59 [2019-10-14 21:45:13,532 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:45:13,532 INFO L462 AbstractCegarLoop]: Abstraction has 68 states and 72 transitions. [2019-10-14 21:45:13,532 INFO L463 AbstractCegarLoop]: Interpolant automaton has 15 states. [2019-10-14 21:45:13,533 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 72 transitions. [2019-10-14 21:45:13,534 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2019-10-14 21:45:13,540 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:45:13,541 INFO L380 BasicCegarLoop]: trace histogram [11, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:45:13,755 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:45:13,755 INFO L410 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:45:13,756 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:45:13,756 INFO L82 PathProgramCache]: Analyzing trace with hash 342894732, now seen corresponding path program 11 times [2019-10-14 21:45:13,756 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:45:13,757 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1084302224] [2019-10-14 21:45:13,757 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:45:13,757 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:45:13,757 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:45:13,780 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:45:13,893 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:45:13,897 INFO L134 CoverageAnalysis]: Checked inductivity of 264 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 198 trivial. 0 not checked. [2019-10-14 21:45:13,897 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1084302224] [2019-10-14 21:45:13,897 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [348595855] [2019-10-14 21:45:13,898 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 21:45:22,399 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 7 check-sat command(s) [2019-10-14 21:45:22,399 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:45:22,410 INFO L256 TraceCheckSpWp]: Trace formula consists of 237 conjuncts, 13 conjunts are in the unsatisfiable core [2019-10-14 21:45:22,412 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:45:22,453 INFO L134 CoverageAnalysis]: Checked inductivity of 264 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 198 trivial. 0 not checked. [2019-10-14 21:45:22,453 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:45:22,454 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 14] total 16 [2019-10-14 21:45:22,454 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1369133618] [2019-10-14 21:45:22,454 INFO L442 AbstractCegarLoop]: Interpolant automaton has 16 states [2019-10-14 21:45:22,455 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:45:22,455 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2019-10-14 21:45:22,455 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=133, Unknown=0, NotChecked=0, Total=240 [2019-10-14 21:45:22,455 INFO L87 Difference]: Start difference. First operand 68 states and 72 transitions. Second operand 16 states. [2019-10-14 21:45:22,618 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:45:22,619 INFO L93 Difference]: Finished difference Result 122 states and 133 transitions. [2019-10-14 21:45:22,619 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2019-10-14 21:45:22,619 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 63 [2019-10-14 21:45:22,620 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:45:22,620 INFO L225 Difference]: With dead ends: 122 [2019-10-14 21:45:22,620 INFO L226 Difference]: Without dead ends: 72 [2019-10-14 21:45:22,625 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 78 GetRequests, 64 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 31 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=107, Invalid=133, Unknown=0, NotChecked=0, Total=240 [2019-10-14 21:45:22,625 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2019-10-14 21:45:22,634 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 72. [2019-10-14 21:45:22,634 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 72 states. [2019-10-14 21:45:22,635 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 76 transitions. [2019-10-14 21:45:22,635 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 76 transitions. Word has length 63 [2019-10-14 21:45:22,635 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:45:22,636 INFO L462 AbstractCegarLoop]: Abstraction has 72 states and 76 transitions. [2019-10-14 21:45:22,636 INFO L463 AbstractCegarLoop]: Interpolant automaton has 16 states. [2019-10-14 21:45:22,636 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 76 transitions. [2019-10-14 21:45:22,638 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2019-10-14 21:45:22,638 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:45:22,638 INFO L380 BasicCegarLoop]: trace histogram [12, 12, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:45:22,847 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:45:22,847 INFO L410 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:45:22,848 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:45:22,848 INFO L82 PathProgramCache]: Analyzing trace with hash -1686898, now seen corresponding path program 12 times [2019-10-14 21:45:22,848 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:45:22,849 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2014266315] [2019-10-14 21:45:22,849 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:45:22,850 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:45:22,850 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:45:22,878 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:45:23,045 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:45:23,050 INFO L134 CoverageAnalysis]: Checked inductivity of 312 backedges. 0 proven. 78 refuted. 0 times theorem prover too weak. 234 trivial. 0 not checked. [2019-10-14 21:45:23,051 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2014266315] [2019-10-14 21:45:23,051 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [372042228] [2019-10-14 21:45:23,051 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 21:45:39,651 INFO L249 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2019-10-14 21:45:39,651 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:45:39,668 INFO L256 TraceCheckSpWp]: Trace formula consists of 253 conjuncts, 20 conjunts are in the unsatisfiable core [2019-10-14 21:45:39,670 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:45:39,706 INFO L134 CoverageAnalysis]: Checked inductivity of 312 backedges. 24 proven. 78 refuted. 0 times theorem prover too weak. 210 trivial. 0 not checked. [2019-10-14 21:45:39,707 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:45:39,707 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16] total 18 [2019-10-14 21:45:39,707 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1217205254] [2019-10-14 21:45:39,708 INFO L442 AbstractCegarLoop]: Interpolant automaton has 18 states [2019-10-14 21:45:39,709 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:45:39,709 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2019-10-14 21:45:39,709 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=138, Invalid=168, Unknown=0, NotChecked=0, Total=306 [2019-10-14 21:45:39,709 INFO L87 Difference]: Start difference. First operand 72 states and 76 transitions. Second operand 18 states. [2019-10-14 21:45:39,868 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:45:39,868 INFO L93 Difference]: Finished difference Result 129 states and 140 transitions. [2019-10-14 21:45:39,869 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2019-10-14 21:45:39,869 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 67 [2019-10-14 21:45:39,869 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:45:39,870 INFO L225 Difference]: With dead ends: 129 [2019-10-14 21:45:39,870 INFO L226 Difference]: Without dead ends: 76 [2019-10-14 21:45:39,871 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 83 GetRequests, 67 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 36 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=138, Invalid=168, Unknown=0, NotChecked=0, Total=306 [2019-10-14 21:45:39,871 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2019-10-14 21:45:39,887 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 76. [2019-10-14 21:45:39,888 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 76 states. [2019-10-14 21:45:39,888 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 80 transitions. [2019-10-14 21:45:39,889 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 80 transitions. Word has length 67 [2019-10-14 21:45:39,889 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:45:39,889 INFO L462 AbstractCegarLoop]: Abstraction has 76 states and 80 transitions. [2019-10-14 21:45:39,889 INFO L463 AbstractCegarLoop]: Interpolant automaton has 18 states. [2019-10-14 21:45:39,889 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 80 transitions. [2019-10-14 21:45:39,890 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2019-10-14 21:45:39,890 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:45:39,890 INFO L380 BasicCegarLoop]: trace histogram [13, 13, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:45:40,091 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:45:40,091 INFO L410 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:45:40,091 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:45:40,092 INFO L82 PathProgramCache]: Analyzing trace with hash 106590156, now seen corresponding path program 13 times [2019-10-14 21:45:40,092 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:45:40,092 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [403287448] [2019-10-14 21:45:40,092 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:45:40,092 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:45:40,093 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:45:40,120 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:45:40,280 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:45:40,285 INFO L134 CoverageAnalysis]: Checked inductivity of 364 backedges. 0 proven. 91 refuted. 0 times theorem prover too weak. 273 trivial. 0 not checked. [2019-10-14 21:45:40,285 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [403287448] [2019-10-14 21:45:40,286 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1328101047] [2019-10-14 21:45:40,286 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 21:45:40,348 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:45:40,349 INFO L256 TraceCheckSpWp]: Trace formula consists of 269 conjuncts, 15 conjunts are in the unsatisfiable core [2019-10-14 21:45:40,351 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:45:40,394 INFO L134 CoverageAnalysis]: Checked inductivity of 364 backedges. 0 proven. 91 refuted. 0 times theorem prover too weak. 273 trivial. 0 not checked. [2019-10-14 21:45:40,394 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:45:40,394 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 16] total 18 [2019-10-14 21:45:40,395 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [887001046] [2019-10-14 21:45:40,395 INFO L442 AbstractCegarLoop]: Interpolant automaton has 18 states [2019-10-14 21:45:40,396 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:45:40,396 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2019-10-14 21:45:40,396 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=138, Invalid=168, Unknown=0, NotChecked=0, Total=306 [2019-10-14 21:45:40,396 INFO L87 Difference]: Start difference. First operand 76 states and 80 transitions. Second operand 18 states. [2019-10-14 21:45:40,557 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:45:40,558 INFO L93 Difference]: Finished difference Result 136 states and 147 transitions. [2019-10-14 21:45:40,558 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2019-10-14 21:45:40,558 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 71 [2019-10-14 21:45:40,558 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:45:40,559 INFO L225 Difference]: With dead ends: 136 [2019-10-14 21:45:40,559 INFO L226 Difference]: Without dead ends: 80 [2019-10-14 21:45:40,560 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 88 GetRequests, 72 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 37 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=138, Invalid=168, Unknown=0, NotChecked=0, Total=306 [2019-10-14 21:45:40,560 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 80 states. [2019-10-14 21:45:40,579 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 80 to 80. [2019-10-14 21:45:40,579 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 80 states. [2019-10-14 21:45:40,580 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 84 transitions. [2019-10-14 21:45:40,580 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 84 transitions. Word has length 71 [2019-10-14 21:45:40,580 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:45:40,580 INFO L462 AbstractCegarLoop]: Abstraction has 80 states and 84 transitions. [2019-10-14 21:45:40,580 INFO L463 AbstractCegarLoop]: Interpolant automaton has 18 states. [2019-10-14 21:45:40,580 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 84 transitions. [2019-10-14 21:45:40,581 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2019-10-14 21:45:40,581 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:45:40,581 INFO L380 BasicCegarLoop]: trace histogram [14, 14, 14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:45:40,789 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:45:40,789 INFO L410 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:45:40,789 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:45:40,790 INFO L82 PathProgramCache]: Analyzing trace with hash 1965252814, now seen corresponding path program 14 times [2019-10-14 21:45:40,790 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:45:40,790 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [997144716] [2019-10-14 21:45:40,791 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:45:40,791 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:45:40,791 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:45:40,818 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:45:41,000 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:45:41,008 INFO L134 CoverageAnalysis]: Checked inductivity of 420 backedges. 0 proven. 105 refuted. 0 times theorem prover too weak. 315 trivial. 0 not checked. [2019-10-14 21:45:41,009 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [997144716] [2019-10-14 21:45:41,009 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1305853650] [2019-10-14 21:45:41,009 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 21:45:41,097 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-10-14 21:45:41,098 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:45:41,099 INFO L256 TraceCheckSpWp]: Trace formula consists of 285 conjuncts, 16 conjunts are in the unsatisfiable core [2019-10-14 21:45:41,101 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:45:41,128 INFO L134 CoverageAnalysis]: Checked inductivity of 420 backedges. 0 proven. 105 refuted. 0 times theorem prover too weak. 315 trivial. 0 not checked. [2019-10-14 21:45:41,129 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:45:41,130 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 17] total 19 [2019-10-14 21:45:41,130 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [297683104] [2019-10-14 21:45:41,130 INFO L442 AbstractCegarLoop]: Interpolant automaton has 19 states [2019-10-14 21:45:41,131 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:45:41,131 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2019-10-14 21:45:41,133 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=155, Invalid=187, Unknown=0, NotChecked=0, Total=342 [2019-10-14 21:45:41,133 INFO L87 Difference]: Start difference. First operand 80 states and 84 transitions. Second operand 19 states. [2019-10-14 21:45:41,339 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:45:41,340 INFO L93 Difference]: Finished difference Result 143 states and 154 transitions. [2019-10-14 21:45:41,340 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2019-10-14 21:45:41,340 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 75 [2019-10-14 21:45:41,341 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:45:41,341 INFO L225 Difference]: With dead ends: 143 [2019-10-14 21:45:41,342 INFO L226 Difference]: Without dead ends: 84 [2019-10-14 21:45:41,342 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 93 GetRequests, 76 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=155, Invalid=187, Unknown=0, NotChecked=0, Total=342 [2019-10-14 21:45:41,343 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 84 states. [2019-10-14 21:45:41,347 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 84 to 84. [2019-10-14 21:45:41,348 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 84 states. [2019-10-14 21:45:41,348 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 84 states to 84 states and 88 transitions. [2019-10-14 21:45:41,349 INFO L78 Accepts]: Start accepts. Automaton has 84 states and 88 transitions. Word has length 75 [2019-10-14 21:45:41,349 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:45:41,349 INFO L462 AbstractCegarLoop]: Abstraction has 84 states and 88 transitions. [2019-10-14 21:45:41,349 INFO L463 AbstractCegarLoop]: Interpolant automaton has 19 states. [2019-10-14 21:45:41,349 INFO L276 IsEmpty]: Start isEmpty. Operand 84 states and 88 transitions. [2019-10-14 21:45:41,350 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2019-10-14 21:45:41,350 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:45:41,350 INFO L380 BasicCegarLoop]: trace histogram [15, 15, 15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:45:41,555 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:45:41,555 INFO L410 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:45:41,555 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:45:41,555 INFO L82 PathProgramCache]: Analyzing trace with hash -38631668, now seen corresponding path program 15 times [2019-10-14 21:45:41,555 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:45:41,556 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [489890398] [2019-10-14 21:45:41,556 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:45:41,556 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:45:41,556 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:45:41,582 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:45:41,758 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:45:41,764 INFO L134 CoverageAnalysis]: Checked inductivity of 480 backedges. 0 proven. 120 refuted. 0 times theorem prover too weak. 360 trivial. 0 not checked. [2019-10-14 21:45:41,765 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [489890398] [2019-10-14 21:45:41,765 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1459378593] [2019-10-14 21:45:41,765 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