/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 NOT_INCREMENTALLY -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loops-crafted-1/sumt8.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-20 12:17:28,236 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-20 12:17:28,239 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-20 12:17:28,253 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-20 12:17:28,254 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-20 12:17:28,255 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-20 12:17:28,257 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-20 12:17:28,259 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-20 12:17:28,261 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-20 12:17:28,262 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-20 12:17:28,263 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-20 12:17:28,264 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-20 12:17:28,265 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-20 12:17:28,266 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-20 12:17:28,267 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-20 12:17:28,268 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-20 12:17:28,269 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-20 12:17:28,270 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-20 12:17:28,272 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-20 12:17:28,274 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-20 12:17:28,275 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-20 12:17:28,277 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-20 12:17:28,278 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-20 12:17:28,279 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-20 12:17:28,281 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-20 12:17:28,290 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-20 12:17:28,291 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-20 12:17:28,291 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-20 12:17:28,292 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 12:17:28,319 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-20 12:17:28,320 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-20 12:17:28,322 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-20 12:17:28,322 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-20 12:17:28,322 INFO L138 SettingsManager]: * Use SBE=true [2020-07-20 12:17:28,323 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-20 12:17:28,323 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-20 12:17:28,323 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-20 12:17:28,323 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-20 12:17:28,323 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-20 12:17:28,325 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-20 12:17:28,325 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-20 12:17:28,325 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-20 12:17:28,326 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-20 12:17:28,326 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-20 12:17:28,326 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-20 12:17:28,326 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-20 12:17:28,326 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-20 12:17:28,327 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-20 12:17:28,327 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-20 12:17:28,327 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-20 12:17:28,328 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 12:17:28,328 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-20 12:17:28,328 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-20 12:17:28,328 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-20 12:17:28,328 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-20 12:17:28,329 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 12:17:28,329 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-20 12:17:28,329 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-20 12:17:28,329 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 -> NOT_INCREMENTALLY [2020-07-20 12:17:28,725 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-20 12:17:28,742 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-20 12:17:28,745 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-20 12:17:28,746 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-20 12:17:28,747 INFO L275 PluginConnector]: CDTParser initialized [2020-07-20 12:17:28,747 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops-crafted-1/sumt8.c [2020-07-20 12:17:28,826 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/86f4cdc77/895b898eaf284d719e8e2821fce0c54b/FLAGe464ade3d [2020-07-20 12:17:29,356 INFO L306 CDTParser]: Found 1 translation units. [2020-07-20 12:17:29,357 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loops-crafted-1/sumt8.c [2020-07-20 12:17:29,366 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/86f4cdc77/895b898eaf284d719e8e2821fce0c54b/FLAGe464ade3d [2020-07-20 12:17:29,717 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/86f4cdc77/895b898eaf284d719e8e2821fce0c54b [2020-07-20 12:17:29,727 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-20 12:17:29,730 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-20 12:17:29,731 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-20 12:17:29,732 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-20 12:17:29,736 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-20 12:17:29,737 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 12:17:29" (1/1) ... [2020-07-20 12:17:29,740 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@34641db1 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 12:17:29, skipping insertion in model container [2020-07-20 12:17:29,741 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 12:17:29" (1/1) ... [2020-07-20 12:17:29,748 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-20 12:17:29,767 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-20 12:17:29,952 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 12:17:29,958 INFO L203 MainTranslator]: Completed pre-run [2020-07-20 12:17:29,984 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 12:17:30,005 INFO L208 MainTranslator]: Completed translation [2020-07-20 12:17:30,007 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 12:17:30 WrapperNode [2020-07-20 12:17:30,007 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-20 12:17:30,008 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-20 12:17:30,008 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-20 12:17:30,008 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-20 12:17:30,025 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 12:17:30" (1/1) ... [2020-07-20 12:17:30,027 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 12:17:30" (1/1) ... [2020-07-20 12:17:30,035 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 12:17:30" (1/1) ... [2020-07-20 12:17:30,035 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 12:17:30" (1/1) ... [2020-07-20 12:17:30,041 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 12:17:30" (1/1) ... [2020-07-20 12:17:30,153 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 12:17:30" (1/1) ... [2020-07-20 12:17:30,155 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 12:17:30" (1/1) ... [2020-07-20 12:17:30,158 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-20 12:17:30,159 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-20 12:17:30,159 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-20 12:17:30,159 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-20 12:17:30,160 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 12:17:30" (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 12:17:30,235 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-20 12:17:30,235 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-20 12:17:30,235 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2020-07-20 12:17:30,235 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-07-20 12:17:30,235 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-20 12:17:30,235 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-20 12:17:30,236 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-07-20 12:17:30,236 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2020-07-20 12:17:30,236 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-07-20 12:17:30,236 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-20 12:17:30,236 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-20 12:17:30,236 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-20 12:17:30,237 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-20 12:17:30,548 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-20 12:17:30,549 INFO L295 CfgBuilder]: Removed 1 assume(true) statements. [2020-07-20 12:17:30,553 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 12:17:30 BoogieIcfgContainer [2020-07-20 12:17:30,554 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-20 12:17:30,555 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-20 12:17:30,556 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-20 12:17:30,560 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-20 12:17:30,560 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.07 12:17:29" (1/3) ... [2020-07-20 12:17:30,561 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@719f059f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 12:17:30, skipping insertion in model container [2020-07-20 12:17:30,562 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 12:17:30" (2/3) ... [2020-07-20 12:17:30,562 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@719f059f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 12:17:30, skipping insertion in model container [2020-07-20 12:17:30,562 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 12:17:30" (3/3) ... [2020-07-20 12:17:30,565 INFO L109 eAbstractionObserver]: Analyzing ICFG sumt8.c [2020-07-20 12:17:30,578 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-20 12:17:30,588 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-20 12:17:30,603 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-20 12:17:30,630 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-20 12:17:30,631 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-20 12:17:30,631 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-20 12:17:30,631 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-20 12:17:30,632 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-20 12:17:30,632 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-20 12:17:30,632 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-20 12:17:30,632 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-20 12:17:30,654 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states. [2020-07-20 12:17:30,660 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-07-20 12:17:30,660 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 12:17:30,661 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 12:17:30,662 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 12:17:30,668 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 12:17:30,669 INFO L82 PathProgramCache]: Analyzing trace with hash -1078562183, now seen corresponding path program 1 times [2020-07-20 12:17:30,676 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 12:17:30,677 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1523453310] [2020-07-20 12:17:30,677 INFO L95 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 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 12:17:30,749 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 12:17:30,754 INFO L263 TraceCheckSpWp]: Trace formula consists of 53 conjuncts, 25 conjunts are in the unsatisfiable core [2020-07-20 12:17:30,762 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 12:17:31,079 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 12:17:31,080 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 12:17:31,082 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1523453310] [2020-07-20 12:17:31,083 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 12:17:31,083 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2020-07-20 12:17:31,085 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [448059010] [2020-07-20 12:17:31,091 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-07-20 12:17:31,092 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 12:17:31,108 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-07-20 12:17:31,109 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2020-07-20 12:17:31,111 INFO L87 Difference]: Start difference. First operand 28 states. Second operand 7 states. [2020-07-20 12:17:31,397 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 12:17:31,397 INFO L93 Difference]: Finished difference Result 71 states and 105 transitions. [2020-07-20 12:17:31,398 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-20 12:17:31,400 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 14 [2020-07-20 12:17:31,401 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 12:17:31,413 INFO L225 Difference]: With dead ends: 71 [2020-07-20 12:17:31,414 INFO L226 Difference]: Without dead ends: 39 [2020-07-20 12:17:31,418 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=15, Invalid=41, Unknown=0, NotChecked=0, Total=56 [2020-07-20 12:17:31,442 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2020-07-20 12:17:31,471 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2020-07-20 12:17:31,473 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2020-07-20 12:17:31,474 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 46 transitions. [2020-07-20 12:17:31,477 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 46 transitions. Word has length 14 [2020-07-20 12:17:31,477 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 12:17:31,477 INFO L479 AbstractCegarLoop]: Abstraction has 39 states and 46 transitions. [2020-07-20 12:17:31,477 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-07-20 12:17:31,478 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 46 transitions. [2020-07-20 12:17:31,479 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-07-20 12:17:31,479 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 12:17:31,479 INFO L422 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, 1] [2020-07-20 12:17:31,693 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 12:17:31,693 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 12:17:31,694 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 12:17:31,694 INFO L82 PathProgramCache]: Analyzing trace with hash -858115487, now seen corresponding path program 1 times [2020-07-20 12:17:31,695 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 12:17:31,695 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1981391557] [2020-07-20 12:17:31,695 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 12:17:31,762 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 12:17:31,764 INFO L263 TraceCheckSpWp]: Trace formula consists of 74 conjuncts, 29 conjunts are in the unsatisfiable core [2020-07-20 12:17:31,771 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 12:17:32,038 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 12:17:32,039 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 12:17:32,082 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 12:17:32,355 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-07-20 12:17:32,357 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1981391557] [2020-07-20 12:17:32,357 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 1 imperfect interpolant sequences. [2020-07-20 12:17:32,358 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [9] total 11 [2020-07-20 12:17:32,358 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [537443535] [2020-07-20 12:17:32,362 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-07-20 12:17:32,362 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 12:17:32,363 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-07-20 12:17:32,364 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=86, Unknown=0, NotChecked=0, Total=110 [2020-07-20 12:17:32,364 INFO L87 Difference]: Start difference. First operand 39 states and 46 transitions. Second operand 6 states. [2020-07-20 12:17:47,201 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 12:17:47,202 INFO L93 Difference]: Finished difference Result 55 states and 69 transitions. [2020-07-20 12:17:47,203 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-20 12:17:47,203 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 28 [2020-07-20 12:17:47,204 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 12:17:47,206 INFO L225 Difference]: With dead ends: 55 [2020-07-20 12:17:47,207 INFO L226 Difference]: Without dead ends: 53 [2020-07-20 12:17:47,208 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 41 SyntacticMatches, 5 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=28, Invalid=104, Unknown=0, NotChecked=0, Total=132 [2020-07-20 12:17:47,209 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2020-07-20 12:17:47,217 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 53. [2020-07-20 12:17:47,218 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53 states. [2020-07-20 12:17:47,219 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 67 transitions. [2020-07-20 12:17:47,220 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 67 transitions. Word has length 28 [2020-07-20 12:17:47,220 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 12:17:47,220 INFO L479 AbstractCegarLoop]: Abstraction has 53 states and 67 transitions. [2020-07-20 12:17:47,220 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-07-20 12:17:47,221 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 67 transitions. [2020-07-20 12:17:47,222 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2020-07-20 12:17:47,222 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 12:17:47,222 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 12:17:47,436 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 12:17:47,438 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 12:17:47,438 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 12:17:47,439 INFO L82 PathProgramCache]: Analyzing trace with hash -1617304246, now seen corresponding path program 1 times [2020-07-20 12:17:47,439 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 12:17:47,440 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1868171217] [2020-07-20 12:17:47,440 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 12:17:47,498 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 12:17:47,500 INFO L263 TraceCheckSpWp]: Trace formula consists of 91 conjuncts, 33 conjunts are in the unsatisfiable core [2020-07-20 12:17:47,504 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 12:17:47,789 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 4 proven. 13 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-07-20 12:17:47,790 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 12:17:47,826 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 12:17:49,058 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2020-07-20 12:17:49,059 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1868171217] [2020-07-20 12:17:49,059 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 1 imperfect interpolant sequences. [2020-07-20 12:17:49,059 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [11] total 13 [2020-07-20 12:17:49,060 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [404564195] [2020-07-20 12:17:49,061 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-07-20 12:17:49,061 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 12:17:49,074 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-07-20 12:17:49,075 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=126, Unknown=0, NotChecked=0, Total=156 [2020-07-20 12:17:49,075 INFO L87 Difference]: Start difference. First operand 53 states and 67 transitions. Second operand 6 states. [2020-07-20 12:18:03,848 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 12:18:03,848 INFO L93 Difference]: Finished difference Result 83 states and 111 transitions. [2020-07-20 12:18:03,849 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-20 12:18:03,849 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 37 [2020-07-20 12:18:03,850 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 12:18:03,851 INFO L225 Difference]: With dead ends: 83 [2020-07-20 12:18:03,851 INFO L226 Difference]: Without dead ends: 81 [2020-07-20 12:18:03,852 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 74 GetRequests, 55 SyntacticMatches, 7 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=34, Invalid=148, Unknown=0, NotChecked=0, Total=182 [2020-07-20 12:18:03,853 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 81 states. [2020-07-20 12:18:03,871 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 81 to 81. [2020-07-20 12:18:03,871 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 81 states. [2020-07-20 12:18:03,873 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 81 states to 81 states and 109 transitions. [2020-07-20 12:18:03,873 INFO L78 Accepts]: Start accepts. Automaton has 81 states and 109 transitions. Word has length 37 [2020-07-20 12:18:03,874 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 12:18:03,874 INFO L479 AbstractCegarLoop]: Abstraction has 81 states and 109 transitions. [2020-07-20 12:18:03,874 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-07-20 12:18:03,875 INFO L276 IsEmpty]: Start isEmpty. Operand 81 states and 109 transitions. [2020-07-20 12:18:03,876 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2020-07-20 12:18:03,876 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 12:18:03,876 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 12:18:04,079 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 12:18:04,080 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 12:18:04,080 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 12:18:04,080 INFO L82 PathProgramCache]: Analyzing trace with hash -1823757099, now seen corresponding path program 1 times [2020-07-20 12:18:04,081 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 12:18:04,082 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1340287555] [2020-07-20 12:18:04,082 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 12:18:04,144 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 12:18:04,146 INFO L263 TraceCheckSpWp]: Trace formula consists of 92 conjuncts, 27 conjunts are in the unsatisfiable core [2020-07-20 12:18:04,149 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 12:18:04,317 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 12:18:04,322 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 3 disjuncts [2020-07-20 12:18:04,337 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 11 proven. 10 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-20 12:18:04,338 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 12:18:04,575 INFO L320 QuantifierPusher]: Applying distributivity to a DISJUNCTION[2, 2, 2, 1] term [2020-07-20 12:18:04,576 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 12:18:04,664 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1340287555] [2020-07-20 12:18:04,664 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-20 12:18:04,664 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-07-20 12:18:04,665 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1068609839] [2020-07-20 12:18:04,665 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-07-20 12:18:04,665 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 12:18:04,666 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-07-20 12:18:04,666 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=85, Unknown=0, NotChecked=0, Total=110 [2020-07-20 12:18:04,666 INFO L87 Difference]: Start difference. First operand 81 states and 109 transitions. Second operand 8 states. [2020-07-20 12:18:09,113 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 12:18:09,114 INFO L93 Difference]: Finished difference Result 147 states and 209 transitions. [2020-07-20 12:18:09,116 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-20 12:18:09,116 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 38 [2020-07-20 12:18:09,117 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 12:18:09,119 INFO L225 Difference]: With dead ends: 147 [2020-07-20 12:18:09,119 INFO L226 Difference]: Without dead ends: 89 [2020-07-20 12:18:09,120 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 37 SyntacticMatches, 1 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=36, Invalid=120, Unknown=0, NotChecked=0, Total=156 [2020-07-20 12:18:09,121 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 89 states. [2020-07-20 12:18:09,145 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 89 to 89. [2020-07-20 12:18:09,145 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 89 states. [2020-07-20 12:18:09,147 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 89 states to 89 states and 118 transitions. [2020-07-20 12:18:09,147 INFO L78 Accepts]: Start accepts. Automaton has 89 states and 118 transitions. Word has length 38 [2020-07-20 12:18:09,149 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 12:18:09,150 INFO L479 AbstractCegarLoop]: Abstraction has 89 states and 118 transitions. [2020-07-20 12:18:09,150 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-07-20 12:18:09,150 INFO L276 IsEmpty]: Start isEmpty. Operand 89 states and 118 transitions. [2020-07-20 12:18:09,152 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-07-20 12:18:09,152 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 12:18:09,153 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 12:18:09,363 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 12:18:09,365 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 12:18:09,365 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 12:18:09,365 INFO L82 PathProgramCache]: Analyzing trace with hash 328323648, now seen corresponding path program 1 times [2020-07-20 12:18:09,366 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 12:18:09,366 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [774176747] [2020-07-20 12:18:09,367 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 12:18:09,407 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 12:18:09,409 INFO L263 TraceCheckSpWp]: Trace formula consists of 95 conjuncts, 27 conjunts are in the unsatisfiable core [2020-07-20 12:18:09,411 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 12:18:09,539 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 12:18:09,543 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 3 disjuncts [2020-07-20 12:18:09,555 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 11 proven. 13 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-20 12:18:09,555 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 12:18:09,737 INFO L320 QuantifierPusher]: Applying distributivity to a DISJUNCTION[2, 2, 2, 1] term [2020-07-20 12:18:09,738 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 12:18:09,808 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [774176747] [2020-07-20 12:18:09,808 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-20 12:18:09,808 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-07-20 12:18:09,809 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [442367949] [2020-07-20 12:18:09,809 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-07-20 12:18:09,809 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 12:18:09,809 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-07-20 12:18:09,810 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=85, Unknown=0, NotChecked=0, Total=110 [2020-07-20 12:18:09,810 INFO L87 Difference]: Start difference. First operand 89 states and 118 transitions. Second operand 8 states. [2020-07-20 12:18:12,156 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 12:18:12,157 INFO L93 Difference]: Finished difference Result 112 states and 149 transitions. [2020-07-20 12:18:12,157 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-20 12:18:12,158 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 41 [2020-07-20 12:18:12,158 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 12:18:12,160 INFO L225 Difference]: With dead ends: 112 [2020-07-20 12:18:12,160 INFO L226 Difference]: Without dead ends: 54 [2020-07-20 12:18:12,161 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 43 SyntacticMatches, 1 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=36, Invalid=120, Unknown=0, NotChecked=0, Total=156 [2020-07-20 12:18:12,162 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2020-07-20 12:18:12,167 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 53. [2020-07-20 12:18:12,168 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53 states. [2020-07-20 12:18:12,169 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 60 transitions. [2020-07-20 12:18:12,169 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 60 transitions. Word has length 41 [2020-07-20 12:18:12,170 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 12:18:12,170 INFO L479 AbstractCegarLoop]: Abstraction has 53 states and 60 transitions. [2020-07-20 12:18:12,170 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-07-20 12:18:12,170 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 60 transitions. [2020-07-20 12:18:12,171 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2020-07-20 12:18:12,171 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 12:18:12,172 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 12:18:12,374 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 12:18:12,376 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 12:18:12,376 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 12:18:12,376 INFO L82 PathProgramCache]: Analyzing trace with hash -1066251509, now seen corresponding path program 1 times [2020-07-20 12:18:12,377 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 12:18:12,377 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1867201182] [2020-07-20 12:18:12,378 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 [2020-07-20 12:18:12,419 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 12:18:12,421 INFO L263 TraceCheckSpWp]: Trace formula consists of 96 conjuncts, 33 conjunts are in the unsatisfiable core [2020-07-20 12:18:12,425 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 12:18:12,679 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 4 proven. 18 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-07-20 12:18:12,680 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 12:18:12,711 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 12:18:35,161 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 8 proven. 0 refuted. 11 times theorem prover too weak. 7 trivial. 0 not checked. [2020-07-20 12:18:35,162 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1867201182] [2020-07-20 12:18:35,162 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 12:18:35,162 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 9] total 16 [2020-07-20 12:18:35,162 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [271685358] [2020-07-20 12:18:35,163 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-07-20 12:18:35,163 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 12:18:35,163 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-07-20 12:18:35,164 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=184, Unknown=5, NotChecked=0, Total=240 [2020-07-20 12:18:35,164 INFO L87 Difference]: Start difference. First operand 53 states and 60 transitions. Second operand 16 states. [2020-07-20 12:19:06,603 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 12:19:06,603 INFO L93 Difference]: Finished difference Result 93 states and 122 transitions. [2020-07-20 12:19:06,603 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-20 12:19:06,604 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 42 [2020-07-20 12:19:06,604 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 12:19:06,605 INFO L225 Difference]: With dead ends: 93 [2020-07-20 12:19:06,605 INFO L226 Difference]: Without dead ends: 77 [2020-07-20 12:19:06,606 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 84 GetRequests, 65 SyntacticMatches, 4 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17 ImplicationChecksByTransitivity, 22.6s TimeCoverageRelationStatistics Valid=55, Invalid=212, Unknown=5, NotChecked=0, Total=272 [2020-07-20 12:19:06,607 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 77 states. [2020-07-20 12:19:06,613 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 77 to 76. [2020-07-20 12:19:06,613 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 76 states. [2020-07-20 12:19:06,614 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 91 transitions. [2020-07-20 12:19:06,615 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 91 transitions. Word has length 42 [2020-07-20 12:19:06,615 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 12:19:06,615 INFO L479 AbstractCegarLoop]: Abstraction has 76 states and 91 transitions. [2020-07-20 12:19:06,615 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-07-20 12:19:06,615 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 91 transitions. [2020-07-20 12:19:06,617 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2020-07-20 12:19:06,617 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 12:19:06,617 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 4, 4, 4, 4, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 12:19:06,823 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 12:19:06,824 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 12:19:06,824 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 12:19:06,825 INFO L82 PathProgramCache]: Analyzing trace with hash -52130443, now seen corresponding path program 1 times [2020-07-20 12:19:06,825 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 12:19:06,826 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [696995119] [2020-07-20 12:19:06,826 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 12:19:06,870 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 12:19:06,872 INFO L263 TraceCheckSpWp]: Trace formula consists of 134 conjuncts, 11 conjunts are in the unsatisfiable core [2020-07-20 12:19:06,874 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 12:19:06,930 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 16 proven. 51 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2020-07-20 12:19:06,931 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 12:19:25,709 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 16 proven. 34 refuted. 17 times theorem prover too weak. 24 trivial. 0 not checked. [2020-07-20 12:19:25,709 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [696995119] [2020-07-20 12:19:25,710 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 12:19:25,710 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 12 [2020-07-20 12:19:25,710 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2109644712] [2020-07-20 12:19:25,710 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-20 12:19:25,711 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 12:19:25,711 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-20 12:19:25,711 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=80, Unknown=9, NotChecked=0, Total=132 [2020-07-20 12:19:25,712 INFO L87 Difference]: Start difference. First operand 76 states and 91 transitions. Second operand 12 states. [2020-07-20 12:19:27,950 WARN L838 $PredicateComparison]: unable to prove that (and (< 0 (mod (mod (mod (+ c_main_~l~0 1) 4294967296) 7) 4294967296)) (< 0 (mod (mod (mod c_main_~l~0 4294967296) 7) 4294967296)) (< 0 (mod (mod (mod (+ c_main_~l~0 3) 4294967296) 7) 4294967296)) (< 0 (mod (mod (mod (+ c_main_~l~0 4) 4294967296) 7) 4294967296))) is different from false [2020-07-20 12:19:30,016 WARN L838 $PredicateComparison]: unable to prove that (and (< 0 (mod (mod (mod (+ c_main_~l~0 1) 4294967296) 7) 4294967296)) (< 0 (mod (mod (mod c_main_~l~0 4294967296) 7) 4294967296)) (< 0 (mod (mod (mod (+ c_main_~l~0 3) 4294967296) 7) 4294967296))) is different from false [2020-07-20 12:19:32,088 WARN L838 $PredicateComparison]: unable to prove that (and (< 0 (mod (mod (mod (+ c_main_~l~0 1) 4294967296) 7) 4294967296)) (< 0 (mod (mod (mod (+ c_main_~l~0 3) 4294967296) 7) 4294967296))) is different from false [2020-07-20 12:20:38,458 WARN L838 $PredicateComparison]: unable to prove that (and (< 0 (mod (mod (mod c_main_~l~0 4294967296) 7) 4294967296)) (< 0 (mod (mod (mod (+ c_main_~l~0 2) 4294967296) 7) 4294967296))) is different from false [2020-07-20 12:22:26,028 WARN L838 $PredicateComparison]: unable to prove that (and (< 0 (mod (mod (mod (+ c_main_~l~0 1) 4294967296) 7) 4294967296)) (< 0 (mod (mod (mod c_main_~l~0 4294967296) 7) 4294967296))) is different from false [2020-07-20 12:22:52,870 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 12:22:52,871 INFO L93 Difference]: Finished difference Result 140 states and 194 transitions. [2020-07-20 12:22:52,934 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-07-20 12:22:52,935 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 64 [2020-07-20 12:22:52,935 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 12:22:52,936 INFO L225 Difference]: With dead ends: 140 [2020-07-20 12:22:52,937 INFO L226 Difference]: Without dead ends: 110 [2020-07-20 12:22:52,938 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 132 GetRequests, 117 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 5 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 29.2s TimeCoverageRelationStatistics Valid=53, Invalid=85, Unknown=14, NotChecked=120, Total=272 [2020-07-20 12:22:52,939 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 110 states. [2020-07-20 12:22:52,948 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 110 to 109. [2020-07-20 12:22:52,948 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 109 states. [2020-07-20 12:22:52,950 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 109 states to 109 states and 142 transitions. [2020-07-20 12:22:52,950 INFO L78 Accepts]: Start accepts. Automaton has 109 states and 142 transitions. Word has length 64 [2020-07-20 12:22:52,950 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 12:22:52,950 INFO L479 AbstractCegarLoop]: Abstraction has 109 states and 142 transitions. [2020-07-20 12:22:52,950 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-20 12:22:52,951 INFO L276 IsEmpty]: Start isEmpty. Operand 109 states and 142 transitions. [2020-07-20 12:22:52,952 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2020-07-20 12:22:52,952 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 12:22:52,952 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 12:22:53,154 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 12:22:53,155 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 12:22:53,156 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 12:22:53,156 INFO L82 PathProgramCache]: Analyzing trace with hash 1890085349, now seen corresponding path program 1 times [2020-07-20 12:22:53,156 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 12:22:53,157 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1201456362] [2020-07-20 12:22:53,157 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 12:22:53,223 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 12:22:53,226 INFO L263 TraceCheckSpWp]: Trace formula consists of 137 conjuncts, 41 conjunts are in the unsatisfiable core [2020-07-20 12:22:53,229 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 12:22:53,688 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 8 proven. 68 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2020-07-20 12:22:53,688 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 12:22:53,732 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 12:24:02,559 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 15 proven. 0 refuted. 51 times theorem prover too weak. 34 trivial. 0 not checked. [2020-07-20 12:24:02,560 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1201456362] [2020-07-20 12:24:02,560 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 12:24:02,560 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 13] total 24 [2020-07-20 12:24:02,560 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1434141098] [2020-07-20 12:24:02,561 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-07-20 12:24:02,561 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 12:24:02,561 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-07-20 12:24:02,562 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=104, Invalid=424, Unknown=24, NotChecked=0, Total=552 [2020-07-20 12:24:02,562 INFO L87 Difference]: Start difference. First operand 109 states and 142 transitions. Second operand 24 states. [2020-07-20 12:24:15,593 WARN L193 SmtUtils]: Spent 2.09 s on a formula simplification. DAG size of input: 35 DAG size of output: 18 [2020-07-20 12:24:55,030 WARN L193 SmtUtils]: Spent 4.14 s on a formula simplification that was a NOOP. DAG size: 24 [2020-07-20 12:25:30,187 WARN L193 SmtUtils]: Spent 4.13 s on a formula simplification that was a NOOP. DAG size: 28 [2020-07-20 12:26:44,899 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 12:26:44,899 INFO L93 Difference]: Finished difference Result 145 states and 195 transitions. [2020-07-20 12:26:44,900 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2020-07-20 12:26:44,900 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 67 [2020-07-20 12:26:44,900 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 12:26:44,903 INFO L225 Difference]: With dead ends: 145 [2020-07-20 12:26:44,903 INFO L226 Difference]: Without dead ends: 101 [2020-07-20 12:26:44,905 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 141 GetRequests, 108 SyntacticMatches, 7 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 75 ImplicationChecksByTransitivity, 144.1s TimeCoverageRelationStatistics Valid=141, Invalid=573, Unknown=42, NotChecked=0, Total=756 [2020-07-20 12:26:44,905 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 101 states. [2020-07-20 12:26:44,912 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 101 to 95. [2020-07-20 12:26:44,913 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 95 states. [2020-07-20 12:26:44,914 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 95 states to 95 states and 111 transitions. [2020-07-20 12:26:44,914 INFO L78 Accepts]: Start accepts. Automaton has 95 states and 111 transitions. Word has length 67 [2020-07-20 12:26:44,914 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 12:26:44,914 INFO L479 AbstractCegarLoop]: Abstraction has 95 states and 111 transitions. [2020-07-20 12:26:44,914 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-07-20 12:26:44,915 INFO L276 IsEmpty]: Start isEmpty. Operand 95 states and 111 transitions. [2020-07-20 12:26:44,916 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 88 [2020-07-20 12:26:44,916 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 12:26:44,916 INFO L422 BasicCegarLoop]: trace histogram [7, 7, 7, 7, 6, 6, 6, 6, 5, 5, 4, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 12:26:45,121 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 12:26:45,122 INFO L427 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 12:26:45,123 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 12:26:45,123 INFO L82 PathProgramCache]: Analyzing trace with hash 1891591146, now seen corresponding path program 1 times [2020-07-20 12:26:45,124 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 12:26:45,124 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [76614077] [2020-07-20 12:26:45,125 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 12:26:45,188 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 12:26:45,191 INFO L263 TraceCheckSpWp]: Trace formula consists of 173 conjuncts, 49 conjunts are in the unsatisfiable core [2020-07-20 12:26:45,194 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 12:26:45,854 INFO L134 CoverageAnalysis]: Checked inductivity of 201 backedges. 12 proven. 129 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2020-07-20 12:26:45,854 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 12:26:45,922 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 12:27:34,417 INFO L134 CoverageAnalysis]: Checked inductivity of 201 backedges. 35 proven. 0 refuted. 57 times theorem prover too weak. 109 trivial. 0 not checked. [2020-07-20 12:27:34,418 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [76614077] [2020-07-20 12:27:34,418 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 12:27:34,418 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 10] total 25 [2020-07-20 12:27:34,418 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [490901232] [2020-07-20 12:27:34,419 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-07-20 12:27:34,419 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 12:27:34,419 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-07-20 12:27:34,422 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=95, Invalid=496, Unknown=9, NotChecked=0, Total=600 [2020-07-20 12:27:34,423 INFO L87 Difference]: Start difference. First operand 95 states and 111 transitions. Second operand 25 states. [2020-07-20 12:27:45,467 WARN L193 SmtUtils]: Spent 4.14 s on a formula simplification that was a NOOP. DAG size: 26 [2020-07-20 12:27:55,903 WARN L193 SmtUtils]: Spent 4.16 s on a formula simplification that was a NOOP. DAG size: 24 [2020-07-20 12:29:25,147 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 12:29:25,148 INFO L93 Difference]: Finished difference Result 183 states and 250 transitions. [2020-07-20 12:29:25,148 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2020-07-20 12:29:25,148 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 87 [2020-07-20 12:29:25,149 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 12:29:25,151 INFO L225 Difference]: With dead ends: 183 [2020-07-20 12:29:25,151 INFO L226 Difference]: Without dead ends: 153 [2020-07-20 12:29:25,152 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 177 GetRequests, 140 SyntacticMatches, 11 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 38 ImplicationChecksByTransitivity, 69.8s TimeCoverageRelationStatistics Valid=124, Invalid=617, Unknown=15, NotChecked=0, Total=756 [2020-07-20 12:29:25,152 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 153 states. [2020-07-20 12:29:25,164 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 153 to 153. [2020-07-20 12:29:25,164 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 153 states. [2020-07-20 12:29:25,165 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 153 states to 153 states and 202 transitions. [2020-07-20 12:29:25,166 INFO L78 Accepts]: Start accepts. Automaton has 153 states and 202 transitions. Word has length 87 [2020-07-20 12:29:25,166 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 12:29:25,166 INFO L479 AbstractCegarLoop]: Abstraction has 153 states and 202 transitions. [2020-07-20 12:29:25,166 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-07-20 12:29:25,166 INFO L276 IsEmpty]: Start isEmpty. Operand 153 states and 202 transitions. [2020-07-20 12:29:25,169 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 106 [2020-07-20 12:29:25,169 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 12:29:25,169 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 9, 9, 8, 8, 8, 7, 6, 5, 4, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 12:29:25,371 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 12:29:25,372 INFO L427 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 12:29:25,372 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 12:29:25,373 INFO L82 PathProgramCache]: Analyzing trace with hash -1465856945, now seen corresponding path program 1 times [2020-07-20 12:29:25,373 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 12:29:25,373 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2106233528] [2020-07-20 12:29:25,374 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 12:29:25,428 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 12:29:25,429 INFO L263 TraceCheckSpWp]: Trace formula consists of 207 conjuncts, 57 conjunts are in the unsatisfiable core [2020-07-20 12:29:25,435 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 12:29:26,176 INFO L134 CoverageAnalysis]: Checked inductivity of 328 backedges. 16 proven. 200 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2020-07-20 12:29:26,176 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 12:29:26,244 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts