/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample FPandBPonlyIfFpWasNotPerfect -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.assert.codeblocks SMT_FEATURE_HEURISTIC --traceabstraction.assert.codeblocks.term.scoring.heuristic NUM_VARIABLES --traceabstraction.assert.codeblocks.term.scoring.heuristic.partitioning.strategy FIXED_NUM_PARTITIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.number.of.partitions 4 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loop-industry-pattern/aiob_4.c.v+lh-reducer.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-20 18:05:13,428 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-20 18:05:13,431 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-20 18:05:13,452 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-20 18:05:13,453 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-20 18:05:13,455 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-20 18:05:13,456 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-20 18:05:13,458 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-20 18:05:13,461 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-20 18:05:13,462 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-20 18:05:13,464 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-20 18:05:13,466 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-20 18:05:13,466 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-20 18:05:13,468 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-20 18:05:13,470 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-20 18:05:13,471 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-20 18:05:13,472 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-20 18:05:13,474 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-20 18:05:13,477 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-20 18:05:13,480 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-20 18:05:13,483 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-20 18:05:13,485 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-20 18:05:13,486 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-20 18:05:13,488 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-20 18:05:13,492 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-20 18:05:13,505 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-20 18:05:13,506 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-20 18:05:13,508 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-20 18:05:13,509 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 [2020-07-20 18:05:13,550 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-20 18:05:13,551 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-20 18:05:13,555 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-20 18:05:13,555 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-20 18:05:13,556 INFO L138 SettingsManager]: * Use SBE=true [2020-07-20 18:05:13,556 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-20 18:05:13,556 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-20 18:05:13,556 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-20 18:05:13,557 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-20 18:05:13,557 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-20 18:05:13,558 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-20 18:05:13,559 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-20 18:05:13,559 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-20 18:05:13,560 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-20 18:05:13,560 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-20 18:05:13,561 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-20 18:05:13,561 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-20 18:05:13,561 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-20 18:05:13,561 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-20 18:05:13,562 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-20 18:05:13,562 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-20 18:05:13,563 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 18:05:13,563 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-20 18:05:13,564 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-20 18:05:13,564 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-20 18:05:13,564 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-20 18:05:13,564 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 18:05:13,564 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-20 18:05:13,565 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-20 18:05:13,565 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> FPandBPonlyIfFpWasNotPerfect Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks -> SMT_FEATURE_HEURISTIC Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic -> NUM_VARIABLES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic Partitioning Strategy -> FIXED_NUM_PARTITIONS Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic number of partitions -> 4 [2020-07-20 18:05:13,941 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-20 18:05:13,978 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-20 18:05:13,986 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-20 18:05:13,990 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-20 18:05:13,991 INFO L275 PluginConnector]: CDTParser initialized [2020-07-20 18:05:13,992 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-industry-pattern/aiob_4.c.v+lh-reducer.c [2020-07-20 18:05:14,090 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/b48d2d037/6aa05e0e558943cda1964357a65ca4dd/FLAGb49b09d60 [2020-07-20 18:05:14,915 INFO L306 CDTParser]: Found 1 translation units. [2020-07-20 18:05:14,916 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-industry-pattern/aiob_4.c.v+lh-reducer.c [2020-07-20 18:05:14,938 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/b48d2d037/6aa05e0e558943cda1964357a65ca4dd/FLAGb49b09d60 [2020-07-20 18:05:15,046 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/b48d2d037/6aa05e0e558943cda1964357a65ca4dd [2020-07-20 18:05:15,061 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-20 18:05:15,065 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-20 18:05:15,067 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-20 18:05:15,067 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-20 18:05:15,071 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-20 18:05:15,073 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 06:05:15" (1/1) ... [2020-07-20 18:05:15,077 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@5a290736 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 06:05:15, skipping insertion in model container [2020-07-20 18:05:15,077 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 06:05:15" (1/1) ... [2020-07-20 18:05:15,088 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-20 18:05:15,125 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-20 18:05:15,492 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 18:05:15,509 INFO L203 MainTranslator]: Completed pre-run [2020-07-20 18:05:15,711 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 18:05:15,732 INFO L208 MainTranslator]: Completed translation [2020-07-20 18:05:15,733 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 06:05:15 WrapperNode [2020-07-20 18:05:15,733 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-20 18:05:15,734 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-20 18:05:15,735 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-20 18:05:15,735 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-20 18:05:15,753 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 06:05:15" (1/1) ... [2020-07-20 18:05:15,754 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 06:05:15" (1/1) ... [2020-07-20 18:05:15,783 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 06:05:15" (1/1) ... [2020-07-20 18:05:15,783 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 06:05:15" (1/1) ... [2020-07-20 18:05:15,829 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 06:05:15" (1/1) ... [2020-07-20 18:05:15,836 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 06:05:15" (1/1) ... [2020-07-20 18:05:15,841 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 06:05:15" (1/1) ... [2020-07-20 18:05:15,849 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-20 18:05:15,850 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-20 18:05:15,851 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-20 18:05:15,851 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-20 18:05:15,853 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 06:05:15" (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 [2020-07-20 18:05:16,001 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-20 18:05:16,002 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-20 18:05:16,003 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-20 18:05:16,003 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-20 18:05:16,004 INFO L130 BoogieDeclarations]: Found specification of procedure Id_MCDC_89 [2020-07-20 18:05:16,004 INFO L130 BoogieDeclarations]: Found specification of procedure fopen [2020-07-20 18:05:16,004 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-20 18:05:16,005 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-07-20 18:05:16,005 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-07-20 18:05:16,006 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-07-20 18:05:16,007 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2020-07-20 18:05:16,007 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2020-07-20 18:05:16,007 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-07-20 18:05:16,008 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-20 18:05:16,008 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-20 18:05:16,010 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-07-20 18:05:16,011 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2020-07-20 18:05:19,214 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-20 18:05:19,215 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-07-20 18:05:19,221 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 06:05:19 BoogieIcfgContainer [2020-07-20 18:05:19,221 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-20 18:05:19,223 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-20 18:05:19,223 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-20 18:05:19,228 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-20 18:05:19,228 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.07 06:05:15" (1/3) ... [2020-07-20 18:05:19,230 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@228c59e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 06:05:19, skipping insertion in model container [2020-07-20 18:05:19,231 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 06:05:15" (2/3) ... [2020-07-20 18:05:19,231 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@228c59e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 06:05:19, skipping insertion in model container [2020-07-20 18:05:19,231 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 06:05:19" (3/3) ... [2020-07-20 18:05:19,234 INFO L109 eAbstractionObserver]: Analyzing ICFG aiob_4.c.v+lh-reducer.c [2020-07-20 18:05:19,249 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-20 18:05:19,261 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-20 18:05:19,281 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-20 18:05:19,318 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-20 18:05:19,319 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-20 18:05:19,319 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-20 18:05:19,319 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-20 18:05:19,319 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-20 18:05:19,319 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-20 18:05:19,320 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-20 18:05:19,320 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-20 18:05:19,349 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states. [2020-07-20 18:05:19,358 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2020-07-20 18:05:19,358 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 18:05:19,360 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 18:05:19,361 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 18:05:19,370 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 18:05:19,371 INFO L82 PathProgramCache]: Analyzing trace with hash 1960518123, now seen corresponding path program 1 times [2020-07-20 18:05:19,381 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 18:05:19,382 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2119220875] [2020-07-20 18:05:19,383 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 18:05:25,497 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 18:05:25,497 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 18:05:25,507 INFO L263 TraceCheckSpWp]: Trace formula consists of 388 conjuncts, 5 conjunts are in the unsatisfiable core [2020-07-20 18:05:25,516 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 18:05:25,586 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 18:05:25,587 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 18:05:25,589 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2119220875] [2020-07-20 18:05:25,590 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 18:05:25,590 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-07-20 18:05:25,592 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2111356200] [2020-07-20 18:05:25,599 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-07-20 18:05:25,599 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 18:05:25,618 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-07-20 18:05:25,620 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-07-20 18:05:25,623 INFO L87 Difference]: Start difference. First operand 19 states. Second operand 4 states. [2020-07-20 18:05:25,749 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 18:05:25,749 INFO L93 Difference]: Finished difference Result 38 states and 46 transitions. [2020-07-20 18:05:25,751 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-07-20 18:05:25,754 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 12 [2020-07-20 18:05:25,755 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 18:05:25,772 INFO L225 Difference]: With dead ends: 38 [2020-07-20 18:05:25,773 INFO L226 Difference]: Without dead ends: 21 [2020-07-20 18:05:25,780 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-07-20 18:05:25,810 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2020-07-20 18:05:25,840 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 18. [2020-07-20 18:05:25,842 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2020-07-20 18:05:25,844 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 18 transitions. [2020-07-20 18:05:25,847 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 18 transitions. Word has length 12 [2020-07-20 18:05:25,848 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 18:05:25,848 INFO L479 AbstractCegarLoop]: Abstraction has 18 states and 18 transitions. [2020-07-20 18:05:25,849 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-07-20 18:05:25,849 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 18 transitions. [2020-07-20 18:05:25,850 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2020-07-20 18:05:25,850 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 18:05:25,850 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 18:05:26,064 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 18:05:26,065 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 18:05:26,065 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 18:05:26,066 INFO L82 PathProgramCache]: Analyzing trace with hash 1182240945, now seen corresponding path program 1 times [2020-07-20 18:05:26,066 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 18:05:26,066 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [950698101] [2020-07-20 18:05:26,067 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 18:05:35,440 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 18:05:35,441 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 18:05:35,475 INFO L263 TraceCheckSpWp]: Trace formula consists of 409 conjuncts, 7 conjunts are in the unsatisfiable core [2020-07-20 18:05:35,480 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 18:05:35,530 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 18:05:35,531 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 18:05:35,619 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 18:05:35,621 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [950698101] [2020-07-20 18:05:35,621 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 18:05:35,622 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 8 [2020-07-20 18:05:35,622 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2136341678] [2020-07-20 18:05:35,626 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-07-20 18:05:35,627 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 18:05:35,627 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-07-20 18:05:35,628 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=38, Unknown=0, NotChecked=0, Total=56 [2020-07-20 18:05:35,628 INFO L87 Difference]: Start difference. First operand 18 states and 18 transitions. Second operand 8 states. [2020-07-20 18:05:40,014 WARN L193 SmtUtils]: Spent 2.09 s on a formula simplification that was a NOOP. DAG size: 15 [2020-07-20 18:05:40,113 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 18:05:40,113 INFO L93 Difference]: Finished difference Result 38 states and 40 transitions. [2020-07-20 18:05:40,115 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-20 18:05:40,115 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 17 [2020-07-20 18:05:40,115 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 18:05:40,116 INFO L225 Difference]: With dead ends: 38 [2020-07-20 18:05:40,116 INFO L226 Difference]: Without dead ends: 35 [2020-07-20 18:05:40,119 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 27 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=63, Invalid=119, Unknown=0, NotChecked=0, Total=182 [2020-07-20 18:05:40,119 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2020-07-20 18:05:40,126 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 33. [2020-07-20 18:05:40,127 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2020-07-20 18:05:40,129 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 33 transitions. [2020-07-20 18:05:40,129 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 33 transitions. Word has length 17 [2020-07-20 18:05:40,130 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 18:05:40,130 INFO L479 AbstractCegarLoop]: Abstraction has 33 states and 33 transitions. [2020-07-20 18:05:40,130 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-07-20 18:05:40,130 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 33 transitions. [2020-07-20 18:05:40,131 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2020-07-20 18:05:40,132 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 18:05:40,132 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 18:05:40,333 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 18:05:40,335 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 18:05:40,335 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 18:05:40,336 INFO L82 PathProgramCache]: Analyzing trace with hash 1890060651, now seen corresponding path program 2 times [2020-07-20 18:05:40,337 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 18:05:40,337 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2104551982] [2020-07-20 18:05:40,337 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 18:06:14,369 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 18:06:14,370 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 18:06:14,826 INFO L263 TraceCheckSpWp]: Trace formula consists of 474 conjuncts, 13 conjunts are in the unsatisfiable core [2020-07-20 18:06:14,831 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 18:06:14,921 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 18:06:14,922 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 18:06:21,462 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 36 refuted. 6 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 18:06:21,463 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2104551982] [2020-07-20 18:06:21,463 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 18:06:21,464 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 14 [2020-07-20 18:06:21,464 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1594967302] [2020-07-20 18:06:21,465 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-07-20 18:06:21,465 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 18:06:21,466 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-07-20 18:06:21,470 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=128, Unknown=3, NotChecked=0, Total=182 [2020-07-20 18:06:21,471 INFO L87 Difference]: Start difference. First operand 33 states and 33 transitions. Second operand 14 states. [2020-07-20 18:06:32,082 WARN L193 SmtUtils]: Spent 2.15 s on a formula simplification. DAG size of input: 28 DAG size of output: 13 [2020-07-20 18:06:36,494 WARN L193 SmtUtils]: Spent 2.12 s on a formula simplification. DAG size of input: 25 DAG size of output: 15 [2020-07-20 18:06:42,983 WARN L193 SmtUtils]: Spent 2.10 s on a formula simplification that was a NOOP. DAG size: 15 [2020-07-20 18:06:47,278 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 18:06:47,279 INFO L93 Difference]: Finished difference Result 68 states and 73 transitions. [2020-07-20 18:06:47,280 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-07-20 18:06:47,281 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 32 [2020-07-20 18:06:47,281 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 18:06:47,284 INFO L225 Difference]: With dead ends: 68 [2020-07-20 18:06:47,284 INFO L226 Difference]: Without dead ends: 65 [2020-07-20 18:06:47,285 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 76 GetRequests, 52 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 75 ImplicationChecksByTransitivity, 17.7s TimeCoverageRelationStatistics Valid=190, Invalid=455, Unknown=5, NotChecked=0, Total=650 [2020-07-20 18:06:47,287 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2020-07-20 18:06:47,297 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 63. [2020-07-20 18:06:47,297 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 63 states. [2020-07-20 18:06:47,300 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 63 transitions. [2020-07-20 18:06:47,300 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 63 transitions. Word has length 32 [2020-07-20 18:06:47,301 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 18:06:47,301 INFO L479 AbstractCegarLoop]: Abstraction has 63 states and 63 transitions. [2020-07-20 18:06:47,301 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-07-20 18:06:47,302 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 63 transitions. [2020-07-20 18:06:47,304 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2020-07-20 18:06:47,304 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 18:06:47,305 INFO L422 BasicCegarLoop]: trace histogram [11, 11, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 18:06:47,520 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 18:06:47,521 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 18:06:47,522 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 18:06:47,522 INFO L82 PathProgramCache]: Analyzing trace with hash 1772338347, now seen corresponding path program 3 times [2020-07-20 18:06:47,523 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 18:06:47,523 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1511960498] [2020-07-20 18:06:47,524 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 18:08:00,590 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 18:08:00,591 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 18:08:03,805 INFO L263 TraceCheckSpWp]: Trace formula consists of 600 conjuncts, 25 conjunts are in the unsatisfiable core [2020-07-20 18:08:03,810 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 18:08:04,005 INFO L134 CoverageAnalysis]: Checked inductivity of 255 backedges. 0 proven. 255 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 18:08:04,005 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 18:08:12,961 INFO L134 CoverageAnalysis]: Checked inductivity of 255 backedges. 0 proven. 239 refuted. 16 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 18:08:12,962 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1511960498] [2020-07-20 18:08:12,963 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 18:08:12,963 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14] total 26 [2020-07-20 18:08:12,963 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2111337251] [2020-07-20 18:08:12,964 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2020-07-20 18:08:12,965 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 18:08:12,965 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2020-07-20 18:08:12,966 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=171, Invalid=475, Unknown=4, NotChecked=0, Total=650 [2020-07-20 18:08:12,966 INFO L87 Difference]: Start difference. First operand 63 states and 63 transitions. Second operand 26 states. [2020-07-20 18:08:34,829 WARN L193 SmtUtils]: Spent 465.00 ms on a formula simplification. DAG size of input: 58 DAG size of output: 13 [2020-07-20 18:08:37,475 WARN L193 SmtUtils]: Spent 2.44 s on a formula simplification. DAG size of input: 60 DAG size of output: 15 [2020-07-20 18:08:42,476 WARN L193 SmtUtils]: Spent 2.61 s on a formula simplification. DAG size of input: 55 DAG size of output: 15 [2020-07-20 18:08:43,543 WARN L193 SmtUtils]: Spent 405.00 ms on a formula simplification. DAG size of input: 50 DAG size of output: 15 [2020-07-20 18:08:48,345 WARN L193 SmtUtils]: Spent 226.00 ms on a formula simplification. DAG size of input: 45 DAG size of output: 15 [2020-07-20 18:08:48,904 WARN L193 SmtUtils]: Spent 155.00 ms on a formula simplification. DAG size of input: 40 DAG size of output: 15 [2020-07-20 18:08:53,905 WARN L193 SmtUtils]: Spent 2.38 s on a formula simplification. DAG size of input: 35 DAG size of output: 15 [2020-07-20 18:08:56,650 WARN L193 SmtUtils]: Spent 2.17 s on a formula simplification. DAG size of input: 30 DAG size of output: 15 [2020-07-20 18:09:13,375 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 18:09:13,376 INFO L93 Difference]: Finished difference Result 128 states and 139 transitions. [2020-07-20 18:09:13,381 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2020-07-20 18:09:13,382 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 62 [2020-07-20 18:09:13,383 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 18:09:13,386 INFO L225 Difference]: With dead ends: 128 [2020-07-20 18:09:13,386 INFO L226 Difference]: Without dead ends: 125 [2020-07-20 18:09:13,389 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 148 GetRequests, 100 SyntacticMatches, 0 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 297 ImplicationChecksByTransitivity, 44.0s TimeCoverageRelationStatistics Valid=664, Invalid=1774, Unknown=12, NotChecked=0, Total=2450 [2020-07-20 18:09:13,391 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 125 states. [2020-07-20 18:09:13,410 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 125 to 123. [2020-07-20 18:09:13,411 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 123 states. [2020-07-20 18:09:13,414 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 123 states to 123 states and 123 transitions. [2020-07-20 18:09:13,415 INFO L78 Accepts]: Start accepts. Automaton has 123 states and 123 transitions. Word has length 62 [2020-07-20 18:09:13,416 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 18:09:13,416 INFO L479 AbstractCegarLoop]: Abstraction has 123 states and 123 transitions. [2020-07-20 18:09:13,417 INFO L480 AbstractCegarLoop]: Interpolant automaton has 26 states. [2020-07-20 18:09:13,417 INFO L276 IsEmpty]: Start isEmpty. Operand 123 states and 123 transitions. [2020-07-20 18:09:13,422 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 123 [2020-07-20 18:09:13,423 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 18:09:13,423 INFO L422 BasicCegarLoop]: trace histogram [23, 23, 22, 22, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 18:09:13,631 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 18:09:13,632 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 18:09:13,633 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 18:09:13,633 INFO L82 PathProgramCache]: Analyzing trace with hash -357330133, now seen corresponding path program 4 times [2020-07-20 18:09:13,634 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 18:09:13,634 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [226732227] [2020-07-20 18:09:13,635 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 18:11:40,411 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 18:11:40,411 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 18:11:45,664 INFO L263 TraceCheckSpWp]: Trace formula consists of 805 conjuncts, 49 conjunts are in the unsatisfiable core [2020-07-20 18:11:45,671 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 18:11:46,065 INFO L134 CoverageAnalysis]: Checked inductivity of 1221 backedges. 0 proven. 1221 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 18:11:46,066 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 18:12:10,571 INFO L134 CoverageAnalysis]: Checked inductivity of 1221 backedges. 0 proven. 1185 refuted. 36 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 18:12:10,572 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [226732227] [2020-07-20 18:12:10,572 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 18:12:10,572 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26] total 50 [2020-07-20 18:12:10,573 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [597593361] [2020-07-20 18:12:10,573 INFO L459 AbstractCegarLoop]: Interpolant automaton has 50 states [2020-07-20 18:12:10,574 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 18:12:10,574 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2020-07-20 18:12:10,576 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=621, Invalid=1818, Unknown=11, NotChecked=0, Total=2450 [2020-07-20 18:12:10,576 INFO L87 Difference]: Start difference. First operand 123 states and 123 transitions. Second operand 50 states. [2020-07-20 18:12:27,939 WARN L193 SmtUtils]: Spent 2.17 s on a formula simplification. DAG size of input: 99 DAG size of output: 14 [2020-07-20 18:12:34,928 WARN L193 SmtUtils]: Spent 1.48 s on a formula simplification. DAG size of input: 100 DAG size of output: 15 [2020-07-20 18:12:42,357 WARN L193 SmtUtils]: Spent 965.00 ms on a formula simplification. DAG size of input: 95 DAG size of output: 15 [2020-07-20 18:12:51,546 WARN L193 SmtUtils]: Spent 5.00 s on a formula simplification. DAG size of input: 90 DAG size of output: 15 [2020-07-20 18:12:59,301 WARN L193 SmtUtils]: Spent 485.00 ms on a formula simplification. DAG size of input: 85 DAG size of output: 15 [2020-07-20 18:13:09,076 WARN L193 SmtUtils]: Spent 2.94 s on a formula simplification. DAG size of input: 80 DAG size of output: 15 [2020-07-20 18:13:17,180 WARN L193 SmtUtils]: Spent 251.00 ms on a formula simplification. DAG size of input: 75 DAG size of output: 15 [2020-07-20 18:13:21,056 WARN L193 SmtUtils]: Spent 421.00 ms on a formula simplification. DAG size of input: 70 DAG size of output: 15 [2020-07-20 18:13:24,306 WARN L193 SmtUtils]: Spent 393.00 ms on a formula simplification. DAG size of input: 65 DAG size of output: 15 [2020-07-20 18:13:30,248 WARN L193 SmtUtils]: Spent 263.00 ms on a formula simplification. DAG size of input: 60 DAG size of output: 15 [2020-07-20 18:13:43,578 WARN L193 SmtUtils]: Spent 2.30 s on a formula simplification. DAG size of input: 55 DAG size of output: 15 [2020-07-20 18:13:53,069 WARN L193 SmtUtils]: Spent 256.00 ms on a formula simplification. DAG size of input: 50 DAG size of output: 15 [2020-07-20 18:13:59,455 WARN L193 SmtUtils]: Spent 152.00 ms on a formula simplification. DAG size of input: 45 DAG size of output: 15 [2020-07-20 18:14:03,466 WARN L193 SmtUtils]: Spent 165.00 ms on a formula simplification. DAG size of input: 40 DAG size of output: 15 [2020-07-20 18:14:07,853 WARN L193 SmtUtils]: Spent 128.00 ms on a formula simplification. DAG size of input: 35 DAG size of output: 15 [2020-07-20 18:14:12,988 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 30 DAG size of output: 15 [2020-07-20 18:14:20,622 WARN L193 SmtUtils]: Spent 2.12 s on a formula simplification. DAG size of input: 20 DAG size of output: 15 [2020-07-20 18:14:29,447 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 18:14:29,449 INFO L93 Difference]: Finished difference Result 228 states and 247 transitions. [2020-07-20 18:14:29,451 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2020-07-20 18:14:29,451 INFO L78 Accepts]: Start accepts. Automaton has 50 states. Word has length 122 [2020-07-20 18:14:29,452 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 18:14:29,455 INFO L225 Difference]: With dead ends: 228 [2020-07-20 18:14:29,455 INFO L226 Difference]: Without dead ends: 225 [2020-07-20 18:14:29,460 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 288 GetRequests, 196 SyntacticMatches, 0 SemanticMatches, 92 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1061 ImplicationChecksByTransitivity, 136.9s TimeCoverageRelationStatistics Valid=2174, Invalid=6546, Unknown=22, NotChecked=0, Total=8742 [2020-07-20 18:14:29,461 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 225 states. [2020-07-20 18:14:29,481 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 225 to 223. [2020-07-20 18:14:29,481 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 223 states. [2020-07-20 18:14:29,485 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 223 states to 223 states and 223 transitions. [2020-07-20 18:14:29,485 INFO L78 Accepts]: Start accepts. Automaton has 223 states and 223 transitions. Word has length 122 [2020-07-20 18:14:29,486 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 18:14:29,486 INFO L479 AbstractCegarLoop]: Abstraction has 223 states and 223 transitions. [2020-07-20 18:14:29,486 INFO L480 AbstractCegarLoop]: Interpolant automaton has 50 states. [2020-07-20 18:14:29,487 INFO L276 IsEmpty]: Start isEmpty. Operand 223 states and 223 transitions. [2020-07-20 18:14:29,491 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 223 [2020-07-20 18:14:29,491 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 18:14:29,492 INFO L422 BasicCegarLoop]: trace histogram [43, 43, 42, 42, 42, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 18:14:29,707 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 18:14:29,707 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 18:14:29,708 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 18:14:29,709 INFO L82 PathProgramCache]: Analyzing trace with hash -576259925, now seen corresponding path program 5 times [2020-07-20 18:14:29,709 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 18:14:29,710 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2106904451] [2020-07-20 18:14:29,710 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in