/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/loop-lit/cggmp2005b.i -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-20 12:01:51,069 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-20 12:01:51,072 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-20 12:01:51,089 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-20 12:01:51,090 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-20 12:01:51,091 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-20 12:01:51,093 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-20 12:01:51,103 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-20 12:01:51,107 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-20 12:01:51,111 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-20 12:01:51,112 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-20 12:01:51,114 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-20 12:01:51,114 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-20 12:01:51,116 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-20 12:01:51,118 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-20 12:01:51,119 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-20 12:01:51,121 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-20 12:01:51,121 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-20 12:01:51,123 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-20 12:01:51,127 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-20 12:01:51,133 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-20 12:01:51,136 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-20 12:01:51,137 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-20 12:01:51,137 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-20 12:01:51,140 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-20 12:01:51,150 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-20 12:01:51,151 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-20 12:01:51,152 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-20 12:01:51,153 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 12:01:51,189 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-20 12:01:51,189 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-20 12:01:51,192 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-20 12:01:51,193 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-20 12:01:51,193 INFO L138 SettingsManager]: * Use SBE=true [2020-07-20 12:01:51,193 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-20 12:01:51,193 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-20 12:01:51,194 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-20 12:01:51,194 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-20 12:01:51,194 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-20 12:01:51,194 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-20 12:01:51,194 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-20 12:01:51,195 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-20 12:01:51,195 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-20 12:01:51,195 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-20 12:01:51,195 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-20 12:01:51,196 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-20 12:01:51,196 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-20 12:01:51,197 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-20 12:01:51,197 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-20 12:01:51,197 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-20 12:01:51,197 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 12:01:51,197 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-20 12:01:51,198 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-20 12:01:51,198 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-20 12:01:51,198 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-20 12:01:51,198 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 12:01:51,198 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-20 12:01:51,199 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-20 12:01:51,199 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 12:01:51,478 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-20 12:01:51,500 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-20 12:01:51,505 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-20 12:01:51,507 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-20 12:01:51,509 INFO L275 PluginConnector]: CDTParser initialized [2020-07-20 12:01:51,510 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-lit/cggmp2005b.i [2020-07-20 12:01:51,587 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/20698be71/781802dde92442faba577a4dc1f88aae/FLAG850bde16c [2020-07-20 12:01:52,032 INFO L306 CDTParser]: Found 1 translation units. [2020-07-20 12:01:52,033 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-lit/cggmp2005b.i [2020-07-20 12:01:52,039 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/20698be71/781802dde92442faba577a4dc1f88aae/FLAG850bde16c [2020-07-20 12:01:52,421 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/20698be71/781802dde92442faba577a4dc1f88aae [2020-07-20 12:01:52,430 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-20 12:01:52,433 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-20 12:01:52,434 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-20 12:01:52,434 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-20 12:01:52,439 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-20 12:01:52,440 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 12:01:52" (1/1) ... [2020-07-20 12:01:52,443 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@7cfd4b49 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 12:01:52, skipping insertion in model container [2020-07-20 12:01:52,443 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 12:01:52" (1/1) ... [2020-07-20 12:01:52,451 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-20 12:01:52,468 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-20 12:01:52,664 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 12:01:52,668 INFO L203 MainTranslator]: Completed pre-run [2020-07-20 12:01:52,683 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 12:01:52,698 INFO L208 MainTranslator]: Completed translation [2020-07-20 12:01:52,699 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 12:01:52 WrapperNode [2020-07-20 12:01:52,699 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-20 12:01:52,700 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-20 12:01:52,700 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-20 12:01:52,700 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-20 12:01:52,713 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 12:01:52" (1/1) ... [2020-07-20 12:01:52,713 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 12:01:52" (1/1) ... [2020-07-20 12:01:52,719 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 12:01:52" (1/1) ... [2020-07-20 12:01:52,719 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 12:01:52" (1/1) ... [2020-07-20 12:01:52,723 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 12:01:52" (1/1) ... [2020-07-20 12:01:52,728 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 12:01:52" (1/1) ... [2020-07-20 12:01:52,728 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 12:01:52" (1/1) ... [2020-07-20 12:01:52,820 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-20 12:01:52,820 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-20 12:01:52,821 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-20 12:01:52,821 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-20 12:01:52,822 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 12:01:52" (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 12:01:52,895 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-20 12:01:52,895 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-20 12:01:52,896 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2020-07-20 12:01:52,896 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-07-20 12:01:52,896 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-20 12:01:52,896 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-20 12:01:52,896 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-07-20 12:01:52,896 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2020-07-20 12:01:52,896 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-07-20 12:01:52,896 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-20 12:01:52,897 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-20 12:01:52,897 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-20 12:01:52,897 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-20 12:01:53,077 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-20 12:01:53,077 INFO L295 CfgBuilder]: Removed 3 assume(true) statements. [2020-07-20 12:01:53,081 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 12:01:53 BoogieIcfgContainer [2020-07-20 12:01:53,082 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-20 12:01:53,083 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-20 12:01:53,083 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-20 12:01:53,087 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-20 12:01:53,088 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.07 12:01:52" (1/3) ... [2020-07-20 12:01:53,089 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@76a97886 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 12:01:53, skipping insertion in model container [2020-07-20 12:01:53,089 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 12:01:52" (2/3) ... [2020-07-20 12:01:53,090 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@76a97886 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 12:01:53, skipping insertion in model container [2020-07-20 12:01:53,090 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 12:01:53" (3/3) ... [2020-07-20 12:01:53,092 INFO L109 eAbstractionObserver]: Analyzing ICFG cggmp2005b.i [2020-07-20 12:01:53,107 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-20 12:01:53,118 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-20 12:01:53,140 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-20 12:01:53,175 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-20 12:01:53,175 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-20 12:01:53,175 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-20 12:01:53,175 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-20 12:01:53,176 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-20 12:01:53,176 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-20 12:01:53,176 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-20 12:01:53,177 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-20 12:01:53,208 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states. [2020-07-20 12:01:53,220 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2020-07-20 12:01:53,220 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 12:01:53,222 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 12:01:53,222 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 12:01:53,228 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 12:01:53,229 INFO L82 PathProgramCache]: Analyzing trace with hash -1039733575, now seen corresponding path program 1 times [2020-07-20 12:01:53,240 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 12:01:53,247 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2020938047] [2020-07-20 12:01:53,248 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 12:01:53,299 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 12:01:53,301 INFO L263 TraceCheckSpWp]: Trace formula consists of 26 conjuncts, 1 conjunts are in the unsatisfiable core [2020-07-20 12:01:53,306 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 12:01:53,328 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 12:01:53,328 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 12:01:53,329 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2020938047] [2020-07-20 12:01:53,330 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 12:01:53,330 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2020-07-20 12:01:53,331 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1812854476] [2020-07-20 12:01:53,336 INFO L459 AbstractCegarLoop]: Interpolant automaton has 2 states [2020-07-20 12:01:53,337 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 12:01:53,349 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2020-07-20 12:01:53,350 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-07-20 12:01:53,351 INFO L87 Difference]: Start difference. First operand 21 states. Second operand 2 states. [2020-07-20 12:01:53,372 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 12:01:53,372 INFO L93 Difference]: Finished difference Result 37 states and 50 transitions. [2020-07-20 12:01:53,372 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2020-07-20 12:01:53,374 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 10 [2020-07-20 12:01:53,374 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 12:01:53,382 INFO L225 Difference]: With dead ends: 37 [2020-07-20 12:01:53,382 INFO L226 Difference]: Without dead ends: 14 [2020-07-20 12:01:53,386 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-07-20 12:01:53,400 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2020-07-20 12:01:53,416 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2020-07-20 12:01:53,418 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2020-07-20 12:01:53,419 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 16 transitions. [2020-07-20 12:01:53,420 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 16 transitions. Word has length 10 [2020-07-20 12:01:53,421 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 12:01:53,421 INFO L479 AbstractCegarLoop]: Abstraction has 14 states and 16 transitions. [2020-07-20 12:01:53,421 INFO L480 AbstractCegarLoop]: Interpolant automaton has 2 states. [2020-07-20 12:01:53,421 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 16 transitions. [2020-07-20 12:01:53,422 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2020-07-20 12:01:53,422 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 12:01:53,422 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 12:01:53,628 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 12:01:53,629 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 12:01:53,630 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 12:01:53,630 INFO L82 PathProgramCache]: Analyzing trace with hash -1066515684, now seen corresponding path program 1 times [2020-07-20 12:01:53,631 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 12:01:53,631 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [694252492] [2020-07-20 12:01:53,632 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 12:01:53,655 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 12:01:53,656 INFO L263 TraceCheckSpWp]: Trace formula consists of 26 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-20 12:01:53,658 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 12:01:53,705 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 12:01:53,705 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 12:01:53,706 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [694252492] [2020-07-20 12:01:53,706 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 12:01:53,706 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 12:01:53,707 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [4508742] [2020-07-20 12:01:53,710 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 12:01:53,711 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 12:01:53,712 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 12:01:53,712 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 12:01:53,713 INFO L87 Difference]: Start difference. First operand 14 states and 16 transitions. Second operand 3 states. [2020-07-20 12:01:53,746 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 12:01:53,747 INFO L93 Difference]: Finished difference Result 20 states and 22 transitions. [2020-07-20 12:01:53,749 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 12:01:53,749 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 10 [2020-07-20 12:01:53,749 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 12:01:53,750 INFO L225 Difference]: With dead ends: 20 [2020-07-20 12:01:53,750 INFO L226 Difference]: Without dead ends: 15 [2020-07-20 12:01:53,752 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 12:01:53,753 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2020-07-20 12:01:53,758 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2020-07-20 12:01:53,759 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2020-07-20 12:01:53,760 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 17 transitions. [2020-07-20 12:01:53,760 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 17 transitions. Word has length 10 [2020-07-20 12:01:53,761 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 12:01:53,761 INFO L479 AbstractCegarLoop]: Abstraction has 15 states and 17 transitions. [2020-07-20 12:01:53,761 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 12:01:53,762 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 17 transitions. [2020-07-20 12:01:53,763 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-07-20 12:01:53,763 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 12:01:53,764 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 12:01:53,979 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 12:01:53,980 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 12:01:53,980 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 12:01:53,981 INFO L82 PathProgramCache]: Analyzing trace with hash 1875131310, now seen corresponding path program 1 times [2020-07-20 12:01:53,982 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 12:01:53,982 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [771445978] [2020-07-20 12:01:53,983 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 12:01:54,018 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 12:01:54,019 INFO L263 TraceCheckSpWp]: Trace formula consists of 33 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-20 12:01:54,022 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 12:01:54,039 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 12:01:54,039 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 12:01:54,039 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [771445978] [2020-07-20 12:01:54,040 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 12:01:54,040 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 12:01:54,040 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [834389601] [2020-07-20 12:01:54,041 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 12:01:54,041 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 12:01:54,041 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 12:01:54,042 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 12:01:54,042 INFO L87 Difference]: Start difference. First operand 15 states and 17 transitions. Second operand 3 states. [2020-07-20 12:01:54,052 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 12:01:54,053 INFO L93 Difference]: Finished difference Result 25 states and 30 transitions. [2020-07-20 12:01:54,053 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 12:01:54,054 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 14 [2020-07-20 12:01:54,054 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 12:01:54,055 INFO L225 Difference]: With dead ends: 25 [2020-07-20 12:01:54,055 INFO L226 Difference]: Without dead ends: 16 [2020-07-20 12:01:54,056 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 12 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 12:01:54,056 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2020-07-20 12:01:54,060 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2020-07-20 12:01:54,060 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2020-07-20 12:01:54,061 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 18 transitions. [2020-07-20 12:01:54,061 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 18 transitions. Word has length 14 [2020-07-20 12:01:54,061 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 12:01:54,061 INFO L479 AbstractCegarLoop]: Abstraction has 16 states and 18 transitions. [2020-07-20 12:01:54,061 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 12:01:54,062 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 18 transitions. [2020-07-20 12:01:54,062 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2020-07-20 12:01:54,062 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 12:01:54,063 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 12:01:54,263 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 12:01:54,264 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 12:01:54,265 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 12:01:54,266 INFO L82 PathProgramCache]: Analyzing trace with hash -224898986, now seen corresponding path program 1 times [2020-07-20 12:01:54,266 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 12:01:54,266 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [638896719] [2020-07-20 12:01:54,266 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 12:01:54,290 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 12:01:54,291 INFO L263 TraceCheckSpWp]: Trace formula consists of 36 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 12:01:54,293 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 12:01:54,323 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-20 12:01:54,323 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 12:01:54,368 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-20 12:01:54,369 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [638896719] [2020-07-20 12:01:54,369 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 12:01:54,370 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 6 [2020-07-20 12:01:54,370 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [280338019] [2020-07-20 12:01:54,372 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-07-20 12:01:54,372 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 12:01:54,372 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-07-20 12:01:54,373 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2020-07-20 12:01:54,373 INFO L87 Difference]: Start difference. First operand 16 states and 18 transitions. Second operand 6 states. [2020-07-20 12:01:54,422 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 12:01:54,422 INFO L93 Difference]: Finished difference Result 33 states and 43 transitions. [2020-07-20 12:01:54,423 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-20 12:01:54,423 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 15 [2020-07-20 12:01:54,423 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 12:01:54,424 INFO L225 Difference]: With dead ends: 33 [2020-07-20 12:01:54,424 INFO L226 Difference]: Without dead ends: 28 [2020-07-20 12:01:54,425 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 25 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2020-07-20 12:01:54,426 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2020-07-20 12:01:54,432 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2020-07-20 12:01:54,432 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2020-07-20 12:01:54,433 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 36 transitions. [2020-07-20 12:01:54,433 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 36 transitions. Word has length 15 [2020-07-20 12:01:54,434 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 12:01:54,434 INFO L479 AbstractCegarLoop]: Abstraction has 28 states and 36 transitions. [2020-07-20 12:01:54,434 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-07-20 12:01:54,434 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 36 transitions. [2020-07-20 12:01:54,435 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-07-20 12:01:54,435 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 12:01:54,435 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 12:01:54,648 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 12:01:54,649 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 12:01:54,649 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 12:01:54,650 INFO L82 PathProgramCache]: Analyzing trace with hash 1954211852, now seen corresponding path program 2 times [2020-07-20 12:01:54,650 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 12:01:54,651 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1966459559] [2020-07-20 12:01:54,652 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 12:01:54,689 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 12:01:54,690 INFO L263 TraceCheckSpWp]: Trace formula consists of 57 conjuncts, 5 conjunts are in the unsatisfiable core [2020-07-20 12:01:54,692 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 12:01:54,735 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 10 proven. 1 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-07-20 12:01:54,735 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 12:01:54,781 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 10 proven. 1 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-07-20 12:01:54,782 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1966459559] [2020-07-20 12:01:54,782 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 12:01:54,782 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 8 [2020-07-20 12:01:54,782 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1147377321] [2020-07-20 12:01:54,783 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-07-20 12:01:54,783 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 12:01:54,784 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-07-20 12:01:54,784 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=32, Unknown=0, NotChecked=0, Total=56 [2020-07-20 12:01:54,784 INFO L87 Difference]: Start difference. First operand 28 states and 36 transitions. Second operand 8 states. [2020-07-20 12:01:54,831 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 12:01:54,831 INFO L93 Difference]: Finished difference Result 50 states and 67 transitions. [2020-07-20 12:01:54,832 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-20 12:01:54,832 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 27 [2020-07-20 12:01:54,832 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 12:01:54,833 INFO L225 Difference]: With dead ends: 50 [2020-07-20 12:01:54,833 INFO L226 Difference]: Without dead ends: 30 [2020-07-20 12:01:54,834 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 47 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=32, Invalid=40, Unknown=0, NotChecked=0, Total=72 [2020-07-20 12:01:54,834 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-07-20 12:01:54,840 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2020-07-20 12:01:54,840 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-07-20 12:01:54,841 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 38 transitions. [2020-07-20 12:01:54,841 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 38 transitions. Word has length 27 [2020-07-20 12:01:54,841 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 12:01:54,842 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 38 transitions. [2020-07-20 12:01:54,842 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-07-20 12:01:54,842 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 38 transitions. [2020-07-20 12:01:54,843 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2020-07-20 12:01:54,843 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 12:01:54,843 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 12:01:55,059 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 12:01:55,060 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 12:01:55,060 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 12:01:55,061 INFO L82 PathProgramCache]: Analyzing trace with hash -745377012, now seen corresponding path program 3 times [2020-07-20 12:01:55,061 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 12:01:55,062 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1671270079] [2020-07-20 12:01:55,062 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 12:01:55,097 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 12:01:55,098 INFO L263 TraceCheckSpWp]: Trace formula consists of 63 conjuncts, 7 conjunts are in the unsatisfiable core [2020-07-20 12:01:55,100 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 12:01:55,203 INFO L134 CoverageAnalysis]: Checked inductivity of 43 backedges. 16 proven. 6 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-07-20 12:01:55,204 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 12:01:55,300 INFO L134 CoverageAnalysis]: Checked inductivity of 43 backedges. 16 proven. 6 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-07-20 12:01:55,301 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1671270079] [2020-07-20 12:01:55,301 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 12:01:55,302 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 12 [2020-07-20 12:01:55,302 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1125120478] [2020-07-20 12:01:55,302 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-20 12:01:55,303 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 12:01:55,303 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-20 12:01:55,304 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=84, Unknown=0, NotChecked=0, Total=132 [2020-07-20 12:01:55,304 INFO L87 Difference]: Start difference. First operand 30 states and 38 transitions. Second operand 12 states. [2020-07-20 12:01:55,477 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 12:01:55,478 INFO L93 Difference]: Finished difference Result 54 states and 73 transitions. [2020-07-20 12:01:55,478 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-20 12:01:55,478 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 29 [2020-07-20 12:01:55,479 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 12:01:55,479 INFO L225 Difference]: With dead ends: 54 [2020-07-20 12:01:55,480 INFO L226 Difference]: Without dead ends: 34 [2020-07-20 12:01:55,480 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 63 GetRequests, 47 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=125, Invalid=181, Unknown=0, NotChecked=0, Total=306 [2020-07-20 12:01:55,481 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2020-07-20 12:01:55,486 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 34. [2020-07-20 12:01:55,486 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2020-07-20 12:01:55,487 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 42 transitions. [2020-07-20 12:01:55,488 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 42 transitions. Word has length 29 [2020-07-20 12:01:55,488 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 12:01:55,488 INFO L479 AbstractCegarLoop]: Abstraction has 34 states and 42 transitions. [2020-07-20 12:01:55,488 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-20 12:01:55,488 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 42 transitions. [2020-07-20 12:01:55,489 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2020-07-20 12:01:55,489 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 12:01:55,489 INFO L422 BasicCegarLoop]: trace histogram [7, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 12:01:55,700 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 12:01:55,701 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 12:01:55,702 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 12:01:55,703 INFO L82 PathProgramCache]: Analyzing trace with hash 1833781516, now seen corresponding path program 4 times [2020-07-20 12:01:55,703 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 12:01:55,704 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1898948074] [2020-07-20 12:01:55,704 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 12:01:55,734 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 12:01:55,736 INFO L263 TraceCheckSpWp]: Trace formula consists of 75 conjuncts, 11 conjunts are in the unsatisfiable core [2020-07-20 12:01:55,738 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 12:01:55,884 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 28 proven. 28 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-07-20 12:01:55,884 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 12:01:56,089 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 28 proven. 28 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-07-20 12:01:56,090 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1898948074] [2020-07-20 12:01:56,090 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 12:01:56,090 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 20 [2020-07-20 12:01:56,090 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1097682003] [2020-07-20 12:01:56,091 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-07-20 12:01:56,091 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 12:01:56,092 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-07-20 12:01:56,092 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=120, Invalid=260, Unknown=0, NotChecked=0, Total=380 [2020-07-20 12:01:56,092 INFO L87 Difference]: Start difference. First operand 34 states and 42 transitions. Second operand 20 states. [2020-07-20 12:01:56,657 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 12:01:56,657 INFO L93 Difference]: Finished difference Result 62 states and 85 transitions. [2020-07-20 12:01:56,658 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-07-20 12:01:56,658 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 33 [2020-07-20 12:01:56,658 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 12:01:56,659 INFO L225 Difference]: With dead ends: 62 [2020-07-20 12:01:56,659 INFO L226 Difference]: Without dead ends: 42 [2020-07-20 12:01:56,661 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 79 GetRequests, 47 SyntacticMatches, 0 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 160 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=437, Invalid=685, Unknown=0, NotChecked=0, Total=1122 [2020-07-20 12:01:56,661 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2020-07-20 12:01:56,672 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 42. [2020-07-20 12:01:56,673 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2020-07-20 12:01:56,674 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 50 transitions. [2020-07-20 12:01:56,674 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 50 transitions. Word has length 33 [2020-07-20 12:01:56,674 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 12:01:56,675 INFO L479 AbstractCegarLoop]: Abstraction has 42 states and 50 transitions. [2020-07-20 12:01:56,675 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-07-20 12:01:56,675 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 50 transitions. [2020-07-20 12:01:56,676 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-07-20 12:01:56,676 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 12:01:56,676 INFO L422 BasicCegarLoop]: trace histogram [15, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 12:01:56,891 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 12:01:56,891 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 12:01:56,892 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 12:01:56,892 INFO L82 PathProgramCache]: Analyzing trace with hash -701369076, now seen corresponding path program 5 times [2020-07-20 12:01:56,893 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 12:01:56,893 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [885573315] [2020-07-20 12:01:56,894 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 12:01:56,928 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 12:01:56,929 INFO L263 TraceCheckSpWp]: Trace formula consists of 99 conjuncts, 19 conjunts are in the unsatisfiable core [2020-07-20 12:01:56,931 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 12:01:57,257 INFO L134 CoverageAnalysis]: Checked inductivity of 193 backedges. 52 proven. 120 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-07-20 12:01:57,258 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 12:01:57,920 INFO L134 CoverageAnalysis]: Checked inductivity of 193 backedges. 52 proven. 120 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-07-20 12:01:57,921 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [885573315] [2020-07-20 12:01:57,921 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 12:01:57,921 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19] total 36 [2020-07-20 12:01:57,922 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1150892480] [2020-07-20 12:01:57,922 INFO L459 AbstractCegarLoop]: Interpolant automaton has 36 states [2020-07-20 12:01:57,922 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 12:01:57,923 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2020-07-20 12:01:57,924 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=360, Invalid=900, Unknown=0, NotChecked=0, Total=1260 [2020-07-20 12:01:57,924 INFO L87 Difference]: Start difference. First operand 42 states and 50 transitions. Second operand 36 states. [2020-07-20 12:01:59,742 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 12:01:59,743 INFO L93 Difference]: Finished difference Result 78 states and 109 transitions. [2020-07-20 12:01:59,744 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2020-07-20 12:01:59,744 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 41 [2020-07-20 12:01:59,745 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 12:01:59,747 INFO L225 Difference]: With dead ends: 78 [2020-07-20 12:01:59,747 INFO L226 Difference]: Without dead ends: 58 [2020-07-20 12:01:59,752 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 111 GetRequests, 47 SyntacticMatches, 0 SemanticMatches, 64 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 704 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=1637, Invalid=2653, Unknown=0, NotChecked=0, Total=4290 [2020-07-20 12:01:59,752 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2020-07-20 12:01:59,762 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 58. [2020-07-20 12:01:59,763 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 58 states. [2020-07-20 12:01:59,767 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 66 transitions. [2020-07-20 12:01:59,767 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 66 transitions. Word has length 41 [2020-07-20 12:01:59,767 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 12:01:59,768 INFO L479 AbstractCegarLoop]: Abstraction has 58 states and 66 transitions. [2020-07-20 12:01:59,768 INFO L480 AbstractCegarLoop]: Interpolant automaton has 36 states. [2020-07-20 12:01:59,768 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 66 transitions. [2020-07-20 12:01:59,771 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2020-07-20 12:01:59,771 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 12:01:59,771 INFO L422 BasicCegarLoop]: trace histogram [31, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 12:01:59,986 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 12:01:59,987 INFO L427 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 12:01:59,988 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 12:01:59,989 INFO L82 PathProgramCache]: Analyzing trace with hash 1471630604, now seen corresponding path program 6 times [2020-07-20 12:01:59,989 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 12:01:59,990 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1391597127] [2020-07-20 12:01:59,990 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 12:02:00,022 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 12:02:00,023 INFO L263 TraceCheckSpWp]: Trace formula consists of 147 conjuncts, 35 conjunts are in the unsatisfiable core [2020-07-20 12:02:00,026 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 12:02:00,959 INFO L134 CoverageAnalysis]: Checked inductivity of 617 backedges. 100 proven. 496 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-07-20 12:02:00,959 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 12:02:03,178 INFO L134 CoverageAnalysis]: Checked inductivity of 617 backedges. 100 proven. 496 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-07-20 12:02:03,178 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1391597127] [2020-07-20 12:02:03,179 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 12:02:03,179 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 35] total 68 [2020-07-20 12:02:03,179 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2109788545] [2020-07-20 12:02:03,181 INFO L459 AbstractCegarLoop]: Interpolant automaton has 68 states [2020-07-20 12:02:03,181 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 12:02:03,183 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 68 interpolants. [2020-07-20 12:02:03,187 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1224, Invalid=3332, Unknown=0, NotChecked=0, Total=4556 [2020-07-20 12:02:03,187 INFO L87 Difference]: Start difference. First operand 58 states and 66 transitions. Second operand 68 states. [2020-07-20 12:02:11,037 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 12:02:11,037 INFO L93 Difference]: Finished difference Result 110 states and 157 transitions. [2020-07-20 12:02:11,038 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 66 states. [2020-07-20 12:02:11,038 INFO L78 Accepts]: Start accepts. Automaton has 68 states. Word has length 57 [2020-07-20 12:02:11,039 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 12:02:11,040 INFO L225 Difference]: With dead ends: 110 [2020-07-20 12:02:11,040 INFO L226 Difference]: Without dead ends: 90 [2020-07-20 12:02:11,052 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 175 GetRequests, 47 SyntacticMatches, 0 SemanticMatches, 128 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2944 ImplicationChecksByTransitivity, 10.5s TimeCoverageRelationStatistics Valid=6341, Invalid=10429, Unknown=0, NotChecked=0, Total=16770 [2020-07-20 12:02:11,053 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 90 states. [2020-07-20 12:02:11,070 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 90 to 90. [2020-07-20 12:02:11,070 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 90 states. [2020-07-20 12:02:11,072 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 90 states to 90 states and 98 transitions. [2020-07-20 12:02:11,072 INFO L78 Accepts]: Start accepts. Automaton has 90 states and 98 transitions. Word has length 57 [2020-07-20 12:02:11,073 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 12:02:11,073 INFO L479 AbstractCegarLoop]: Abstraction has 90 states and 98 transitions. [2020-07-20 12:02:11,073 INFO L480 AbstractCegarLoop]: Interpolant automaton has 68 states. [2020-07-20 12:02:11,074 INFO L276 IsEmpty]: Start isEmpty. Operand 90 states and 98 transitions. [2020-07-20 12:02:11,079 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 90 [2020-07-20 12:02:11,079 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 12:02:11,080 INFO L422 BasicCegarLoop]: trace histogram [63, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 12:02:11,280 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 12:02:11,281 INFO L427 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 12:02:11,281 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 12:02:11,282 INFO L82 PathProgramCache]: Analyzing trace with hash -374211316, now seen corresponding path program 7 times [2020-07-20 12:02:11,282 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 12:02:11,283 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [585371972] [2020-07-20 12:02:11,283 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 12:02:11,332 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 12:02:11,334 INFO L263 TraceCheckSpWp]: Trace formula consists of 243 conjuncts, 67 conjunts are in the unsatisfiable core [2020-07-20 12:02:11,339 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 12:02:14,730 INFO L134 CoverageAnalysis]: Checked inductivity of 2233 backedges. 196 proven. 2016 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-07-20 12:02:14,731 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 12:02:23,579 INFO L134 CoverageAnalysis]: Checked inductivity of 2233 backedges. 196 proven. 2016 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-07-20 12:02:23,580 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [585371972] [2020-07-20 12:02:23,580 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 12:02:23,580 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [67, 67] total 132 [2020-07-20 12:02:23,580 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1605760330] [2020-07-20 12:02:23,581 INFO L459 AbstractCegarLoop]: Interpolant automaton has 132 states [2020-07-20 12:02:23,581 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 12:02:23,582 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 132 interpolants. [2020-07-20 12:02:23,586 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4404, Invalid=12888, Unknown=0, NotChecked=0, Total=17292 [2020-07-20 12:02:23,586 INFO L87 Difference]: Start difference. First operand 90 states and 98 transitions. Second operand 132 states. [2020-07-20 12:02:23,811 WARN L193 SmtUtils]: Spent 170.00 ms on a formula simplification. DAG size of input: 194 DAG size of output: 10 [2020-07-20 12:02:24,062 WARN L193 SmtUtils]: Spent 171.00 ms on a formula simplification. DAG size of input: 193 DAG size of output: 12 [2020-07-20 12:02:24,277 WARN L193 SmtUtils]: Spent 176.00 ms on a formula simplification. DAG size of input: 191 DAG size of output: 11 [2020-07-20 12:02:24,478 WARN L193 SmtUtils]: Spent 164.00 ms on a formula simplification. DAG size of input: 190 DAG size of output: 13 [2020-07-20 12:02:24,687 WARN L193 SmtUtils]: Spent 161.00 ms on a formula simplification. DAG size of input: 187 DAG size of output: 13 [2020-07-20 12:02:24,893 WARN L193 SmtUtils]: Spent 160.00 ms on a formula simplification. DAG size of input: 184 DAG size of output: 13 [2020-07-20 12:02:25,105 WARN L193 SmtUtils]: Spent 154.00 ms on a formula simplification. DAG size of input: 181 DAG size of output: 13 [2020-07-20 12:02:25,318 WARN L193 SmtUtils]: Spent 150.00 ms on a formula simplification. DAG size of input: 178 DAG size of output: 13 [2020-07-20 12:02:25,531 WARN L193 SmtUtils]: Spent 148.00 ms on a formula simplification. DAG size of input: 175 DAG size of output: 13 [2020-07-20 12:02:25,749 WARN L193 SmtUtils]: Spent 137.00 ms on a formula simplification. DAG size of input: 172 DAG size of output: 13 [2020-07-20 12:02:25,957 WARN L193 SmtUtils]: Spent 134.00 ms on a formula simplification. DAG size of input: 169 DAG size of output: 13 [2020-07-20 12:02:26,188 WARN L193 SmtUtils]: Spent 132.00 ms on a formula simplification. DAG size of input: 166 DAG size of output: 13 [2020-07-20 12:02:26,412 WARN L193 SmtUtils]: Spent 144.00 ms on a formula simplification. DAG size of input: 163 DAG size of output: 13 [2020-07-20 12:02:26,644 WARN L193 SmtUtils]: Spent 140.00 ms on a formula simplification. DAG size of input: 160 DAG size of output: 13 [2020-07-20 12:02:26,868 WARN L193 SmtUtils]: Spent 134.00 ms on a formula simplification. DAG size of input: 157 DAG size of output: 13 [2020-07-20 12:02:27,097 WARN L193 SmtUtils]: Spent 138.00 ms on a formula simplification. DAG size of input: 154 DAG size of output: 13 [2020-07-20 12:02:27,325 WARN L193 SmtUtils]: Spent 122.00 ms on a formula simplification. DAG size of input: 151 DAG size of output: 13 [2020-07-20 12:02:27,555 WARN L193 SmtUtils]: Spent 121.00 ms on a formula simplification. DAG size of input: 148 DAG size of output: 13 [2020-07-20 12:02:27,786 WARN L193 SmtUtils]: Spent 116.00 ms on a formula simplification. DAG size of input: 145 DAG size of output: 13 [2020-07-20 12:02:28,017 WARN L193 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 142 DAG size of output: 13 [2020-07-20 12:02:28,267 WARN L193 SmtUtils]: Spent 115.00 ms on a formula simplification. DAG size of input: 139 DAG size of output: 13 [2020-07-20 12:02:28,505 WARN L193 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 136 DAG size of output: 13 [2020-07-20 12:02:28,737 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 133 DAG size of output: 13 [2020-07-20 12:02:29,004 WARN L193 SmtUtils]: Spent 130.00 ms on a formula simplification. DAG size of input: 130 DAG size of output: 13 [2020-07-20 12:02:37,664 WARN L193 SmtUtils]: Spent 156.00 ms on a formula simplification. DAG size of input: 233 DAG size of output: 16 [2020-07-20 12:02:38,220 WARN L193 SmtUtils]: Spent 149.00 ms on a formula simplification. DAG size of input: 222 DAG size of output: 9 [2020-07-20 12:02:38,788 WARN L193 SmtUtils]: Spent 141.00 ms on a formula simplification. DAG size of input: 218 DAG size of output: 9 [2020-07-20 12:02:39,362 WARN L193 SmtUtils]: Spent 146.00 ms on a formula simplification. DAG size of input: 214 DAG size of output: 9 [2020-07-20 12:02:39,926 WARN L193 SmtUtils]: Spent 141.00 ms on a formula simplification. DAG size of input: 210 DAG size of output: 9 [2020-07-20 12:02:40,479 WARN L193 SmtUtils]: Spent 135.00 ms on a formula simplification. DAG size of input: 206 DAG size of output: 9 [2020-07-20 12:02:41,043 WARN L193 SmtUtils]: Spent 133.00 ms on a formula simplification. DAG size of input: 202 DAG size of output: 9 [2020-07-20 12:02:41,621 WARN L193 SmtUtils]: Spent 137.00 ms on a formula simplification. DAG size of input: 198 DAG size of output: 9 [2020-07-20 12:02:42,198 WARN L193 SmtUtils]: Spent 136.00 ms on a formula simplification. DAG size of input: 194 DAG size of output: 9 [2020-07-20 12:02:42,758 WARN L193 SmtUtils]: Spent 122.00 ms on a formula simplification. DAG size of input: 190 DAG size of output: 9 [2020-07-20 12:02:43,302 WARN L193 SmtUtils]: Spent 116.00 ms on a formula simplification. DAG size of input: 186 DAG size of output: 9 [2020-07-20 12:02:43,868 WARN L193 SmtUtils]: Spent 114.00 ms on a formula simplification. DAG size of input: 182 DAG size of output: 9 [2020-07-20 12:02:44,415 WARN L193 SmtUtils]: Spent 119.00 ms on a formula simplification. DAG size of input: 178 DAG size of output: 9 [2020-07-20 12:02:44,978 WARN L193 SmtUtils]: Spent 118.00 ms on a formula simplification. DAG size of input: 174 DAG size of output: 9 [2020-07-20 12:02:45,541 WARN L193 SmtUtils]: Spent 114.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 9 [2020-07-20 12:02:46,101 WARN L193 SmtUtils]: Spent 116.00 ms on a formula simplification. DAG size of input: 166 DAG size of output: 9 [2020-07-20 12:02:46,634 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 162 DAG size of output: 9 [2020-07-20 12:02:47,181 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 9 [2020-07-20 12:02:47,727 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 154 DAG size of output: 9 [2020-07-20 12:03:04,549 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 12:03:04,550 INFO L93 Difference]: Finished difference Result 167 states and 239 transitions. [2020-07-20 12:03:04,552 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 123 states. [2020-07-20 12:03:04,552 INFO L78 Accepts]: Start accepts. Automaton has 132 states. Word has length 89 [2020-07-20 12:03:04,553 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 12:03:04,554 INFO L225 Difference]: With dead ends: 167 [2020-07-20 12:03:04,554 INFO L226 Difference]: Without dead ends: 147 [2020-07-20 12:03:04,562 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 296 GetRequests, 47 SyntacticMatches, 0 SemanticMatches, 249 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11163 ImplicationChecksByTransitivity, 52.3s TimeCoverageRelationStatistics Valid=23060, Invalid=39690, Unknown=0, NotChecked=0, Total=62750 [2020-07-20 12:03:04,562 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 147 states. [2020-07-20 12:03:04,576 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 147 to 147. [2020-07-20 12:03:04,576 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 147 states. [2020-07-20 12:03:04,578 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 147 states to 147 states and 155 transitions. [2020-07-20 12:03:04,578 INFO L78 Accepts]: Start accepts. Automaton has 147 states and 155 transitions. Word has length 89 [2020-07-20 12:03:04,578 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 12:03:04,578 INFO L479 AbstractCegarLoop]: Abstraction has 147 states and 155 transitions. [2020-07-20 12:03:04,579 INFO L480 AbstractCegarLoop]: Interpolant automaton has 132 states. [2020-07-20 12:03:04,579 INFO L276 IsEmpty]: Start isEmpty. Operand 147 states and 155 transitions. [2020-07-20 12:03:04,580 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 147 [2020-07-20 12:03:04,581 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 12:03:04,581 INFO L422 BasicCegarLoop]: trace histogram [120, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 12:03:04,794 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 12:03:04,796 INFO L427 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 12:03:04,796 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 12:03:04,797 INFO L82 PathProgramCache]: Analyzing trace with hash -1451426972, now seen corresponding path program 8 times [2020-07-20 12:03:04,797 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 12:03:04,798 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [510039280] [2020-07-20 12:03:04,798 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 12:03:04,876 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 12:03:04,878 INFO L263 TraceCheckSpWp]: Trace formula consists of 414 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-20 12:03:04,891 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 12:03:04,976 INFO L134 CoverageAnalysis]: Checked inductivity of 7648 backedges. 0 proven. 388 refuted. 0 times theorem prover too weak. 7260 trivial. 0 not checked. [2020-07-20 12:03:04,977 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 12:03:05,096 INFO L134 CoverageAnalysis]: Checked inductivity of 7648 backedges. 0 proven. 388 refuted. 0 times theorem prover too weak. 7260 trivial. 0 not checked. [2020-07-20 12:03:05,097 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [510039280] [2020-07-20 12:03:05,097 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 12:03:05,097 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 12 [2020-07-20 12:03:05,097 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [642398908] [2020-07-20 12:03:05,098 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-20 12:03:05,098 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 12:03:05,098 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-20 12:03:05,098 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=66, Invalid=66, Unknown=0, NotChecked=0, Total=132 [2020-07-20 12:03:05,098 INFO L87 Difference]: Start difference. First operand 147 states and 155 transitions. Second operand 12 states. [2020-07-20 12:03:05,178 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 12:03:05,179 INFO L93 Difference]: Finished difference Result 176 states and 201 transitions. [2020-07-20 12:03:05,180 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-20 12:03:05,180 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 146 [2020-07-20 12:03:05,182 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 12:03:05,183 INFO L225 Difference]: With dead ends: 176 [2020-07-20 12:03:05,183 INFO L226 Difference]: Without dead ends: 171 [2020-07-20 12:03:05,184 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 291 GetRequests, 281 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=66, Invalid=66, Unknown=0, NotChecked=0, Total=132 [2020-07-20 12:03:05,184 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 171 states. [2020-07-20 12:03:05,200 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 171 to 171. [2020-07-20 12:03:05,200 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 171 states. [2020-07-20 12:03:05,202 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 171 states to 171 states and 191 transitions. [2020-07-20 12:03:05,202 INFO L78 Accepts]: Start accepts. Automaton has 171 states and 191 transitions. Word has length 146 [2020-07-20 12:03:05,203 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 12:03:05,203 INFO L479 AbstractCegarLoop]: Abstraction has 171 states and 191 transitions. [2020-07-20 12:03:05,203 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-20 12:03:05,203 INFO L276 IsEmpty]: Start isEmpty. Operand 171 states and 191 transitions. [2020-07-20 12:03:05,205 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 171 [2020-07-20 12:03:05,205 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 12:03:05,205 INFO L422 BasicCegarLoop]: trace histogram [120, 10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 12:03:05,420 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 12:03:05,420 INFO L427 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 12:03:05,421 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 12:03:05,421 INFO L82 PathProgramCache]: Analyzing trace with hash -699301936, now seen corresponding path program 9 times [2020-07-20 12:03:05,422 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 12:03:05,422 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1409118956] [2020-07-20 12:03:05,422 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 12:03:05,500 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 12:03:05,504 INFO L263 TraceCheckSpWp]: Trace formula consists of 456 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-20 12:03:05,509 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 12:03:05,811 INFO L134 CoverageAnalysis]: Checked inductivity of 8530 backedges. 0 proven. 1270 refuted. 0 times theorem prover too weak. 7260 trivial. 0 not checked. [2020-07-20 12:03:05,811 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 12:03:06,285 INFO L134 CoverageAnalysis]: Checked inductivity of 8530 backedges. 0 proven. 1270 refuted. 0 times theorem prover too weak. 7260 trivial. 0 not checked. [2020-07-20 12:03:06,286 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1409118956] [2020-07-20 12:03:06,286 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 12:03:06,286 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13] total 24 [2020-07-20 12:03:06,286 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2125738858] [2020-07-20 12:03:06,287 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-07-20 12:03:06,287 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 12:03:06,287 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-07-20 12:03:06,288 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=276, Invalid=276, Unknown=0, NotChecked=0, Total=552 [2020-07-20 12:03:06,288 INFO L87 Difference]: Start difference. First operand 171 states and 191 transitions. Second operand 24 states. [2020-07-20 12:03:06,474 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 12:03:06,474 INFO L93 Difference]: Finished difference Result 224 states and 279 transitions. [2020-07-20 12:03:06,475 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2020-07-20 12:03:06,476 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 170 [2020-07-20 12:03:06,476 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 12:03:06,478 INFO L225 Difference]: With dead ends: 224 [2020-07-20 12:03:06,478 INFO L226 Difference]: Without dead ends: 219 [2020-07-20 12:03:06,479 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 339 GetRequests, 317 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=276, Invalid=276, Unknown=0, NotChecked=0, Total=552 [2020-07-20 12:03:06,480 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 219 states. [2020-07-20 12:03:06,505 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 219 to 219. [2020-07-20 12:03:06,505 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 219 states. [2020-07-20 12:03:06,507 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 219 states to 219 states and 263 transitions. [2020-07-20 12:03:06,507 INFO L78 Accepts]: Start accepts. Automaton has 219 states and 263 transitions. Word has length 170 [2020-07-20 12:03:06,508 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 12:03:06,508 INFO L479 AbstractCegarLoop]: Abstraction has 219 states and 263 transitions. [2020-07-20 12:03:06,508 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-07-20 12:03:06,508 INFO L276 IsEmpty]: Start isEmpty. Operand 219 states and 263 transitions. [2020-07-20 12:03:06,510 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 219 [2020-07-20 12:03:06,511 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 12:03:06,511 INFO L422 BasicCegarLoop]: trace histogram [120, 22, 22, 22, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 12:03:06,726 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 12:03:06,727 INFO L427 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 12:03:06,727 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 12:03:06,727 INFO L82 PathProgramCache]: Analyzing trace with hash -377226072, now seen corresponding path program 10 times [2020-07-20 12:03:06,728 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 12:03:06,728 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1365078285] [2020-07-20 12:03:06,729 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 12:03:06,811 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 12:03:06,813 INFO L263 TraceCheckSpWp]: Trace formula consists of 540 conjuncts, 24 conjunts are in the unsatisfiable core [2020-07-20 12:03:06,815 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 12:03:07,412 INFO L134 CoverageAnalysis]: Checked inductivity of 10726 backedges. 0 proven. 3466 refuted. 0 times theorem prover too weak. 7260 trivial. 0 not checked. [2020-07-20 12:03:07,413 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 12:03:08,960 INFO L134 CoverageAnalysis]: Checked inductivity of 10726 backedges. 0 proven. 3466 refuted. 0 times theorem prover too weak. 7260 trivial. 0 not checked. [2020-07-20 12:03:08,960 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1365078285] [2020-07-20 12:03:08,961 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 12:03:08,961 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25] total 48 [2020-07-20 12:03:08,961 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [694045011] [2020-07-20 12:03:08,962 INFO L459 AbstractCegarLoop]: Interpolant automaton has 48 states [2020-07-20 12:03:08,962 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 12:03:08,962 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2020-07-20 12:03:08,963 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1128, Invalid=1128, Unknown=0, NotChecked=0, Total=2256 [2020-07-20 12:03:08,963 INFO L87 Difference]: Start difference. First operand 219 states and 263 transitions. Second operand 48 states. [2020-07-20 12:03:09,365 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 12:03:09,366 INFO L93 Difference]: Finished difference Result 320 states and 435 transitions. [2020-07-20 12:03:09,367 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2020-07-20 12:03:09,367 INFO L78 Accepts]: Start accepts. Automaton has 48 states. Word has length 218 [2020-07-20 12:03:09,368 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 12:03:09,370 INFO L225 Difference]: With dead ends: 320 [2020-07-20 12:03:09,370 INFO L226 Difference]: Without dead ends: 315 [2020-07-20 12:03:09,371 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 435 GetRequests, 389 SyntacticMatches, 0 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=1128, Invalid=1128, Unknown=0, NotChecked=0, Total=2256 [2020-07-20 12:03:09,372 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 315 states. [2020-07-20 12:03:09,386 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 315 to 315. [2020-07-20 12:03:09,386 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 315 states. [2020-07-20 12:03:09,387 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 315 states to 315 states and 407 transitions. [2020-07-20 12:03:09,387 INFO L78 Accepts]: Start accepts. Automaton has 315 states and 407 transitions. Word has length 218 [2020-07-20 12:03:09,388 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 12:03:09,388 INFO L479 AbstractCegarLoop]: Abstraction has 315 states and 407 transitions. [2020-07-20 12:03:09,388 INFO L480 AbstractCegarLoop]: Interpolant automaton has 48 states. [2020-07-20 12:03:09,388 INFO L276 IsEmpty]: Start isEmpty. Operand 315 states and 407 transitions. [2020-07-20 12:03:09,393 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 315 [2020-07-20 12:03:09,393 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 12:03:09,393 INFO L422 BasicCegarLoop]: trace histogram [120, 46, 46, 46, 46, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 12:03:09,607 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 12:03:09,608 INFO L427 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 12:03:09,609 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 12:03:09,609 INFO L82 PathProgramCache]: Analyzing trace with hash -1906391464, now seen corresponding path program 11 times [2020-07-20 12:03:09,610 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 12:03:09,610 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [563476826] [2020-07-20 12:03:09,610 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 15 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 12:03:09,713 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 12:03:09,715 INFO L263 TraceCheckSpWp]: Trace formula consists of 708 conjuncts, 48 conjunts are in the unsatisfiable core [2020-07-20 12:03:09,722 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 12:03:11,905 INFO L134 CoverageAnalysis]: Checked inductivity of 16846 backedges. 0 proven. 9586 refuted. 0 times theorem prover too weak. 7260 trivial. 0 not checked. [2020-07-20 12:03:11,905 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 12:03:17,969 INFO L134 CoverageAnalysis]: Checked inductivity of 16846 backedges. 0 proven. 9586 refuted. 0 times theorem prover too weak. 7260 trivial. 0 not checked. [2020-07-20 12:03:17,969 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [563476826] [2020-07-20 12:03:17,970 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 12:03:17,970 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [49, 49] total 96 [2020-07-20 12:03:17,970 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1426915175] [2020-07-20 12:03:17,971 INFO L459 AbstractCegarLoop]: Interpolant automaton has 96 states [2020-07-20 12:03:17,971 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 12:03:17,971 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 96 interpolants. [2020-07-20 12:03:17,972 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4560, Invalid=4560, Unknown=0, NotChecked=0, Total=9120 [2020-07-20 12:03:17,972 INFO L87 Difference]: Start difference. First operand 315 states and 407 transitions. Second operand 96 states. [2020-07-20 12:03:19,335 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 12:03:19,335 INFO L93 Difference]: Finished difference Result 512 states and 747 transitions. [2020-07-20 12:03:19,337 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 96 states. [2020-07-20 12:03:19,337 INFO L78 Accepts]: Start accepts. Automaton has 96 states. Word has length 314 [2020-07-20 12:03:19,338 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 12:03:19,341 INFO L225 Difference]: With dead ends: 512 [2020-07-20 12:03:19,341 INFO L226 Difference]: Without dead ends: 507 [2020-07-20 12:03:19,342 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 627 GetRequests, 533 SyntacticMatches, 0 SemanticMatches, 94 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 8.0s TimeCoverageRelationStatistics Valid=4560, Invalid=4560, Unknown=0, NotChecked=0, Total=9120 [2020-07-20 12:03:19,344 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 507 states. [2020-07-20 12:03:19,360 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 507 to 507. [2020-07-20 12:03:19,361 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 507 states. [2020-07-20 12:03:19,363 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 507 states to 507 states and 695 transitions. [2020-07-20 12:03:19,363 INFO L78 Accepts]: Start accepts. Automaton has 507 states and 695 transitions. Word has length 314 [2020-07-20 12:03:19,364 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 12:03:19,364 INFO L479 AbstractCegarLoop]: Abstraction has 507 states and 695 transitions. [2020-07-20 12:03:19,364 INFO L480 AbstractCegarLoop]: Interpolant automaton has 96 states. [2020-07-20 12:03:19,364 INFO L276 IsEmpty]: Start isEmpty. Operand 507 states and 695 transitions. [2020-07-20 12:03:19,373 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 507 [2020-07-20 12:03:19,373 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 12:03:19,374 INFO L422 BasicCegarLoop]: trace histogram [120, 94, 94, 94, 94, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 12:03:19,587 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 12:03:19,588 INFO L427 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 12:03:19,589 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 12:03:19,589 INFO L82 PathProgramCache]: Analyzing trace with hash 1953208760, now seen corresponding path program 12 times [2020-07-20 12:03:19,589 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 12:03:19,590 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [674927141] [2020-07-20 12:03:19,590 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 16 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 12:03:19,736 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 12:03:19,740 INFO L263 TraceCheckSpWp]: Trace formula consists of 1044 conjuncts, 96 conjunts are in the unsatisfiable core [2020-07-20 12:03:19,747 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 12:03:28,792 INFO L134 CoverageAnalysis]: Checked inductivity of 35998 backedges. 0 proven. 28738 refuted. 0 times theorem prover too weak. 7260 trivial. 0 not checked. [2020-07-20 12:03:28,793 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 12:03:38,672 INFO L134 CoverageAnalysis]: Checked inductivity of 35998 backedges. 0 proven. 28738 refuted. 0 times theorem prover too weak. 7260 trivial. 0 not checked. [2020-07-20 12:03:38,673 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [674927141] [2020-07-20 12:03:38,673 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 12:03:38,673 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [97, 97] total 103 [2020-07-20 12:03:38,674 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [842816004] [2020-07-20 12:03:38,675 INFO L459 AbstractCegarLoop]: Interpolant automaton has 103 states [2020-07-20 12:03:38,675 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 12:03:38,676 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 103 interpolants. [2020-07-20 12:03:38,677 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5253, Invalid=5253, Unknown=0, NotChecked=0, Total=10506 [2020-07-20 12:03:38,677 INFO L87 Difference]: Start difference. First operand 507 states and 695 transitions. Second operand 103 states. [2020-07-20 12:03:40,062 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 12:03:40,063 INFO L93 Difference]: Finished difference Result 540 states and 748 transitions. [2020-07-20 12:03:40,064 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 103 states. [2020-07-20 12:03:40,064 INFO L78 Accepts]: Start accepts. Automaton has 103 states. Word has length 506 [2020-07-20 12:03:40,066 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 12:03:40,069 INFO L225 Difference]: With dead ends: 540 [2020-07-20 12:03:40,069 INFO L226 Difference]: Without dead ends: 535 [2020-07-20 12:03:40,070 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1011 GetRequests, 821 SyntacticMatches, 89 SemanticMatches, 101 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4450 ImplicationChecksByTransitivity, 18.4s TimeCoverageRelationStatistics Valid=5253, Invalid=5253, Unknown=0, NotChecked=0, Total=10506 [2020-07-20 12:03:40,071 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 535 states. [2020-07-20 12:03:40,088 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 535 to 535. [2020-07-20 12:03:40,088 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 535 states. [2020-07-20 12:03:40,091 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 535 states to 535 states and 737 transitions. [2020-07-20 12:03:40,091 INFO L78 Accepts]: Start accepts. Automaton has 535 states and 737 transitions. Word has length 506 [2020-07-20 12:03:40,092 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 12:03:40,092 INFO L479 AbstractCegarLoop]: Abstraction has 535 states and 737 transitions. [2020-07-20 12:03:40,092 INFO L480 AbstractCegarLoop]: Interpolant automaton has 103 states. [2020-07-20 12:03:40,092 INFO L276 IsEmpty]: Start isEmpty. Operand 535 states and 737 transitions. [2020-07-20 12:03:40,096 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 535 [2020-07-20 12:03:40,096 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 12:03:40,097 INFO L422 BasicCegarLoop]: trace histogram [120, 101, 101, 101, 101, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 12:03:40,307 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 12:03:40,307 INFO L427 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 12:03:40,308 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 12:03:40,308 INFO L82 PathProgramCache]: Analyzing trace with hash 1254004406, now seen corresponding path program 13 times [2020-07-20 12:03:40,308 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 12:03:40,309 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [186178736] [2020-07-20 12:03:40,309 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 17 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 12:03:40,464 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 12:03:40,466 INFO L263 TraceCheckSpWp]: Trace formula consists of 1093 conjuncts, 5 conjunts are in the unsatisfiable core [2020-07-20 12:03:40,472 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 12:03:40,616 INFO L134 CoverageAnalysis]: Checked inductivity of 39561 backedges. 201 proven. 0 refuted. 0 times theorem prover too weak. 39360 trivial. 0 not checked. [2020-07-20 12:03:40,617 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 12:03:40,617 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [186178736] [2020-07-20 12:03:40,617 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 12:03:40,617 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-20 12:03:40,618 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [774255223] [2020-07-20 12:03:40,618 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-20 12:03:40,618 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 12:03:40,618 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-20 12:03:40,618 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-20 12:03:40,619 INFO L87 Difference]: Start difference. First operand 535 states and 737 transitions. Second operand 5 states. [2020-07-20 12:03:40,682 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 12:03:40,682 INFO L93 Difference]: Finished difference Result 940 states and 1344 transitions. [2020-07-20 12:03:40,682 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-20 12:03:40,683 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 534 [2020-07-20 12:03:40,684 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 12:03:40,684 INFO L225 Difference]: With dead ends: 940 [2020-07-20 12:03:40,684 INFO L226 Difference]: Without dead ends: 0 [2020-07-20 12:03:40,696 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 534 GetRequests, 530 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-07-20 12:03:40,696 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2020-07-20 12:03:40,698 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2020-07-20 12:03:40,698 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2020-07-20 12:03:40,698 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2020-07-20 12:03:40,698 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 534 [2020-07-20 12:03:40,699 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 12:03:40,699 INFO L479 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2020-07-20 12:03:40,699 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-20 12:03:40,699 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2020-07-20 12:03:40,699 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2020-07-20 12:03:40,900 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 12:03:40,904 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2020-07-20 12:03:41,105 WARN L193 SmtUtils]: Spent 157.00 ms on a formula simplification. DAG size of input: 345 DAG size of output: 3 [2020-07-20 12:03:41,287 WARN L193 SmtUtils]: Spent 175.00 ms on a formula simplification. DAG size of input: 735 DAG size of output: 7 [2020-07-20 12:03:41,453 INFO L271 CegarLoopResult]: At program point ULTIMATE.initFINAL(line -1) the Hoare annotation is: true [2020-07-20 12:03:41,453 INFO L268 CegarLoopResult]: For program point ULTIMATE.initEXIT(line -1) no Hoare annotation was computed. [2020-07-20 12:03:41,453 INFO L268 CegarLoopResult]: For program point ULTIMATE.startEXIT(line -1) no Hoare annotation was computed. [2020-07-20 12:03:41,453 INFO L271 CegarLoopResult]: At program point L-1(line -1) the Hoare annotation is: true [2020-07-20 12:03:41,453 INFO L271 CegarLoopResult]: At program point ULTIMATE.startENTRY(line -1) the Hoare annotation is: true [2020-07-20 12:03:41,453 INFO L268 CegarLoopResult]: For program point ULTIMATE.startFINAL(line -1) no Hoare annotation was computed. [2020-07-20 12:03:41,454 INFO L268 CegarLoopResult]: For program point assume_abort_if_notENTRY(lines 3 5) no Hoare annotation was computed. [2020-07-20 12:03:41,454 INFO L268 CegarLoopResult]: For program point L4(line 4) no Hoare annotation was computed. [2020-07-20 12:03:41,454 INFO L268 CegarLoopResult]: For program point L4-2(lines 3 5) no Hoare annotation was computed. [2020-07-20 12:03:41,454 INFO L268 CegarLoopResult]: For program point assume_abort_if_notEXIT(lines 3 5) no Hoare annotation was computed. [2020-07-20 12:03:41,454 INFO L268 CegarLoopResult]: For program point mainEXIT(lines 13 30) no Hoare annotation was computed. [2020-07-20 12:03:41,454 INFO L268 CegarLoopResult]: For program point mainFINAL(lines 13 30) no Hoare annotation was computed. [2020-07-20 12:03:41,454 INFO L271 CegarLoopResult]: At program point mainENTRY(lines 13 30) the Hoare annotation is: true [2020-07-20 12:03:41,454 INFO L268 CegarLoopResult]: For program point L28(line 28) no Hoare annotation was computed. [2020-07-20 12:03:41,455 INFO L264 CegarLoopResult]: At program point L24-2(lines 24 26) the Hoare annotation is: (= 4 main_~k~0) [2020-07-20 12:03:41,455 INFO L264 CegarLoopResult]: At program point L24-3(lines 18 27) the Hoare annotation is: (or (and (<= main_~i~0 0) (<= (+ main_~j~0 100) (* 62 main_~i~0))) (= 4 main_~k~0)) [2020-07-20 12:03:41,455 INFO L264 CegarLoopResult]: At program point L20-2(lines 20 22) the Hoare annotation is: (or (= 4 main_~k~0) (<= main_~i~0 1)) [2020-07-20 12:03:41,455 INFO L268 CegarLoopResult]: For program point L20-3(lines 20 22) no Hoare annotation was computed. [2020-07-20 12:03:41,455 INFO L264 CegarLoopResult]: At program point L18-2(lines 18 27) the Hoare annotation is: (= 4 main_~k~0) [2020-07-20 12:03:41,455 INFO L271 CegarLoopResult]: At program point __VERIFIER_assertENTRY(lines 6 11) the Hoare annotation is: true [2020-07-20 12:03:41,456 INFO L268 CegarLoopResult]: For program point __VERIFIER_assertEXIT(lines 6 11) no Hoare annotation was computed. [2020-07-20 12:03:41,456 INFO L268 CegarLoopResult]: For program point L8(line 8) no Hoare annotation was computed. [2020-07-20 12:03:41,456 INFO L268 CegarLoopResult]: For program point L7(lines 7 9) no Hoare annotation was computed. [2020-07-20 12:03:41,456 INFO L268 CegarLoopResult]: For program point L7-2(lines 6 11) no Hoare annotation was computed. [2020-07-20 12:03:41,456 INFO L268 CegarLoopResult]: For program point __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION(line 8) no Hoare annotation was computed. [2020-07-20 12:03:41,475 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 20.07 12:03:41 BoogieIcfgContainer [2020-07-20 12:03:41,475 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-07-20 12:03:41,477 INFO L168 Benchmark]: Toolchain (without parser) took 109045.84 ms. Allocated memory was 137.9 MB in the beginning and 566.2 MB in the end (delta: 428.3 MB). Free memory was 101.3 MB in the beginning and 328.1 MB in the end (delta: -226.7 MB). Peak memory consumption was 201.6 MB. Max. memory is 7.1 GB. [2020-07-20 12:03:41,478 INFO L168 Benchmark]: CDTParser took 0.21 ms. Allocated memory is still 137.9 MB. Free memory was 119.7 MB in the beginning and 119.5 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. [2020-07-20 12:03:41,478 INFO L168 Benchmark]: CACSL2BoogieTranslator took 265.38 ms. Allocated memory is still 137.9 MB. Free memory was 100.9 MB in the beginning and 91.5 MB in the end (delta: 9.4 MB). Peak memory consumption was 9.4 MB. Max. memory is 7.1 GB. [2020-07-20 12:03:41,479 INFO L168 Benchmark]: Boogie Preprocessor took 120.30 ms. Allocated memory was 137.9 MB in the beginning and 202.4 MB in the end (delta: 64.5 MB). Free memory was 91.5 MB in the beginning and 182.5 MB in the end (delta: -91.0 MB). Peak memory consumption was 14.9 MB. Max. memory is 7.1 GB. [2020-07-20 12:03:41,479 INFO L168 Benchmark]: RCFGBuilder took 261.43 ms. Allocated memory is still 202.4 MB. Free memory was 182.5 MB in the beginning and 168.8 MB in the end (delta: 13.7 MB). Peak memory consumption was 13.7 MB. Max. memory is 7.1 GB. [2020-07-20 12:03:41,480 INFO L168 Benchmark]: TraceAbstraction took 108392.05 ms. Allocated memory was 202.4 MB in the beginning and 566.2 MB in the end (delta: 363.9 MB). Free memory was 168.8 MB in the beginning and 328.1 MB in the end (delta: -159.3 MB). Peak memory consumption was 204.6 MB. Max. memory is 7.1 GB. [2020-07-20 12:03:41,483 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.21 ms. Allocated memory is still 137.9 MB. Free memory was 119.7 MB in the beginning and 119.5 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 265.38 ms. Allocated memory is still 137.9 MB. Free memory was 100.9 MB in the beginning and 91.5 MB in the end (delta: 9.4 MB). Peak memory consumption was 9.4 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 120.30 ms. Allocated memory was 137.9 MB in the beginning and 202.4 MB in the end (delta: 64.5 MB). Free memory was 91.5 MB in the beginning and 182.5 MB in the end (delta: -91.0 MB). Peak memory consumption was 14.9 MB. Max. memory is 7.1 GB. * RCFGBuilder took 261.43 ms. Allocated memory is still 202.4 MB. Free memory was 182.5 MB in the beginning and 168.8 MB in the end (delta: 13.7 MB). Peak memory consumption was 13.7 MB. Max. memory is 7.1 GB. * TraceAbstraction took 108392.05 ms. Allocated memory was 202.4 MB in the beginning and 566.2 MB in the end (delta: 363.9 MB). Free memory was 168.8 MB in the beginning and 328.1 MB in the end (delta: -159.3 MB). Peak memory consumption was 204.6 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - PositiveResult [Line: 8]: call of __VERIFIER_error() unreachable For all program executions holds that call of __VERIFIER_error() unreachable at this location - AllSpecificationsHoldResult: All specifications hold 1 specifications checked. All of them hold - InvariantResult [Line: 24]: Loop Invariant Derived loop invariant: 4 == k - InvariantResult [Line: 20]: Loop Invariant Derived loop invariant: 4 == k || i <= 1 - InvariantResult [Line: 18]: Loop Invariant Derived loop invariant: (i <= 0 && j + 100 <= 62 * i) || 4 == k - StatisticsResult: Ultimate Automizer benchmark data CFG has 5 procedures, 25 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: SAFE, OverallTime: 107.7s, OverallIterations: 16, TraceHistogramMax: 120, AutomataDifference: 55.1s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.5s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 236 SDtfs, 2303 SDslu, 2810 SDs, 0 SdLazy, 1254 SolverSat, 528 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 1.6s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 4075 GetRequests, 3207 SyntacticMatches, 89 SemanticMatches, 779 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19455 ImplicationChecksByTransitivity, 95.8s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=535occurred in iteration=15, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.2s AutomataMinimizationTime, 16 MinimizatonAttempts, 0 StatesRemovedByMinimization, 0 NontrivialMinimizations, HoareAnnotationStatistics: 0.0s HoareAnnotationTime, 9 LocationsWithAnnotation, 25 PreInvPairs, 450 NumberOfFragments, 33 HoareAnnotationTreeSize, 25 FomulaSimplifications, 5777 FormulaSimplificationTreeSizeReduction, 0.4s HoareSimplificationTime, 9 FomulaSimplificationsInter, 33 FormulaSimplificationTreeSizeReductionInter, 0.0s HoareSimplificationTimeInter, RefinementEngineStatistics: TRACE_CHECK: 0.1s SsaConstructionTime, 0.6s SatisfiabilityAnalysisTime, 47.7s InterpolantComputationTime, 2213 NumberOfCodeBlocks, 2213 NumberOfCodeBlocksAsserted, 16 NumberOfCheckSat, 3830 ConstructedInterpolants, 0 QuantifiedInterpolants, 3112042 SizeOfPredicates, 22 NumberOfNonLiveVariables, 5060 ConjunctsInSsa, 343 ConjunctsInUnsatCore, 28 InterpolantComputations, 4 PerfectInterpolantSequences, 113220/205452 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be correct! Received shutdown request...