/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loop-industry-pattern/nested-3.c -------------------------------------------------------------------------------- This is Ultimate 0.1.24-fb55353 [2019-11-06 21:22:00,213 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-11-06 21:22:00,215 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-11-06 21:22:00,227 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2019-11-06 21:22:00,228 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2019-11-06 21:22:00,229 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2019-11-06 21:22:00,230 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2019-11-06 21:22:00,232 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2019-11-06 21:22:00,234 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2019-11-06 21:22:00,235 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2019-11-06 21:22:00,236 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2019-11-06 21:22:00,237 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2019-11-06 21:22:00,237 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-11-06 21:22:00,238 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-11-06 21:22:00,239 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-11-06 21:22:00,240 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-11-06 21:22:00,241 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-11-06 21:22:00,242 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-11-06 21:22:00,244 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-11-06 21:22:00,246 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-11-06 21:22:00,247 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-11-06 21:22:00,248 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-11-06 21:22:00,249 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-11-06 21:22:00,250 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-11-06 21:22:00,252 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2019-11-06 21:22:00,260 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-11-06 21:22:00,261 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-11-06 21:22:00,262 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-11-06 21:22:00,262 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2019-11-06 21:22:00,277 INFO L113 SettingsManager]: Loading preferences was successful [2019-11-06 21:22:00,277 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-11-06 21:22:00,278 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2019-11-06 21:22:00,279 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2019-11-06 21:22:00,279 INFO L138 SettingsManager]: * Use SBE=true [2019-11-06 21:22:00,279 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-11-06 21:22:00,279 INFO L138 SettingsManager]: * sizeof long=4 [2019-11-06 21:22:00,280 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2019-11-06 21:22:00,280 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-11-06 21:22:00,280 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-11-06 21:22:00,280 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-11-06 21:22:00,280 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-11-06 21:22:00,281 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-11-06 21:22:00,281 INFO L138 SettingsManager]: * sizeof long double=12 [2019-11-06 21:22:00,281 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-11-06 21:22:00,281 INFO L138 SettingsManager]: * Use constant arrays=true [2019-11-06 21:22:00,281 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-11-06 21:22:00,282 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-11-06 21:22:00,282 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-11-06 21:22:00,282 INFO L138 SettingsManager]: * To the following directory=./dump/ [2019-11-06 21:22:00,282 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2019-11-06 21:22:00,282 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-11-06 21:22:00,283 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-11-06 21:22:00,283 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-11-06 21:22:00,283 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-11-06 21:22:00,283 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2019-11-06 21:22:00,283 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-11-06 21:22:00,284 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-11-06 21:22:00,284 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2019-11-06 21:22:00,641 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-11-06 21:22:00,661 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-11-06 21:22:00,664 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-11-06 21:22:00,665 INFO L271 PluginConnector]: Initializing CDTParser... [2019-11-06 21:22:00,666 INFO L275 PluginConnector]: CDTParser initialized [2019-11-06 21:22:00,666 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-industry-pattern/nested-3.c [2019-11-06 21:22:00,726 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/98cd73ffb/23c256edc0a14d479258b00335637b24/FLAG98f356896 [2019-11-06 21:22:01,132 INFO L306 CDTParser]: Found 1 translation units. [2019-11-06 21:22:01,133 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-industry-pattern/nested-3.c [2019-11-06 21:22:01,140 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/98cd73ffb/23c256edc0a14d479258b00335637b24/FLAG98f356896 [2019-11-06 21:22:01,553 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/98cd73ffb/23c256edc0a14d479258b00335637b24 [2019-11-06 21:22:01,564 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-11-06 21:22:01,566 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2019-11-06 21:22:01,567 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-11-06 21:22:01,567 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-11-06 21:22:01,570 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-11-06 21:22:01,572 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.11 09:22:01" (1/1) ... [2019-11-06 21:22:01,574 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@3a18eb31 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 09:22:01, skipping insertion in model container [2019-11-06 21:22:01,575 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.11 09:22:01" (1/1) ... [2019-11-06 21:22:01,582 INFO L142 MainTranslator]: Starting translation in SV-COMP mode [2019-11-06 21:22:01,602 INFO L173 MainTranslator]: Built tables and reachable declarations [2019-11-06 21:22:01,836 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-11-06 21:22:01,842 INFO L188 MainTranslator]: Completed pre-run [2019-11-06 21:22:01,865 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-11-06 21:22:01,882 INFO L192 MainTranslator]: Completed translation [2019-11-06 21:22:01,883 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 09:22:01 WrapperNode [2019-11-06 21:22:01,883 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-11-06 21:22:01,884 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-11-06 21:22:01,884 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-11-06 21:22:01,884 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-11-06 21:22:01,987 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 09:22:01" (1/1) ... [2019-11-06 21:22:01,987 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 09:22:01" (1/1) ... [2019-11-06 21:22:01,993 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 09:22:01" (1/1) ... [2019-11-06 21:22:01,995 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 09:22:01" (1/1) ... [2019-11-06 21:22:02,000 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 09:22:01" (1/1) ... [2019-11-06 21:22:02,006 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 09:22:01" (1/1) ... [2019-11-06 21:22:02,010 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 09:22:01" (1/1) ... [2019-11-06 21:22:02,016 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-11-06 21:22:02,016 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-11-06 21:22:02,016 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-11-06 21:22:02,017 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-11-06 21:22:02,018 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 09:22:01" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-11-06 21:22:02,076 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2019-11-06 21:22:02,076 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-11-06 21:22:02,076 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2019-11-06 21:22:02,077 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2019-11-06 21:22:02,077 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2019-11-06 21:22:02,077 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2019-11-06 21:22:02,077 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2019-11-06 21:22:02,077 INFO L130 BoogieDeclarations]: Found specification of procedure main [2019-11-06 21:22:02,077 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2019-11-06 21:22:02,077 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-11-06 21:22:02,284 INFO L279 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-11-06 21:22:02,290 INFO L284 CfgBuilder]: Removed 2 assume(true) statements. [2019-11-06 21:22:02,292 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.11 09:22:02 BoogieIcfgContainer [2019-11-06 21:22:02,292 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-11-06 21:22:02,299 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-11-06 21:22:02,299 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-11-06 21:22:02,307 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-11-06 21:22:02,307 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 06.11 09:22:01" (1/3) ... [2019-11-06 21:22:02,309 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1637e87b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.11 09:22:02, skipping insertion in model container [2019-11-06 21:22:02,309 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 09:22:01" (2/3) ... [2019-11-06 21:22:02,310 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1637e87b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.11 09:22:02, skipping insertion in model container [2019-11-06 21:22:02,310 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.11 09:22:02" (3/3) ... [2019-11-06 21:22:02,312 INFO L109 eAbstractionObserver]: Analyzing ICFG nested-3.c [2019-11-06 21:22:02,324 INFO L152 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-11-06 21:22:02,334 INFO L164 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-11-06 21:22:02,347 INFO L249 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-11-06 21:22:02,374 INFO L373 AbstractCegarLoop]: Interprodecural is true [2019-11-06 21:22:02,374 INFO L374 AbstractCegarLoop]: Hoare is true [2019-11-06 21:22:02,374 INFO L375 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-11-06 21:22:02,374 INFO L376 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-11-06 21:22:02,375 INFO L377 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-11-06 21:22:02,375 INFO L378 AbstractCegarLoop]: Difference is false [2019-11-06 21:22:02,375 INFO L379 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-11-06 21:22:02,375 INFO L383 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-11-06 21:22:02,401 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states. [2019-11-06 21:22:02,408 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2019-11-06 21:22:02,408 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 21:22:02,409 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 21:22:02,412 INFO L410 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 21:22:02,418 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 21:22:02,419 INFO L82 PathProgramCache]: Analyzing trace with hash 1419324422, now seen corresponding path program 1 times [2019-11-06 21:22:02,429 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 21:22:02,430 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1471309232] [2019-11-06 21:22:02,430 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 21:22:02,516 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:22:02,576 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:22:02,583 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:22:02,584 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1471309232] [2019-11-06 21:22:02,585 INFO L218 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-06 21:22:02,585 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2019-11-06 21:22:02,586 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [691276461] [2019-11-06 21:22:02,591 INFO L442 AbstractCegarLoop]: Interpolant automaton has 4 states [2019-11-06 21:22:02,591 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 21:22:02,602 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2019-11-06 21:22:02,603 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2019-11-06 21:22:02,605 INFO L87 Difference]: Start difference. First operand 23 states. Second operand 4 states. [2019-11-06 21:22:02,739 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 21:22:02,739 INFO L93 Difference]: Finished difference Result 40 states and 61 transitions. [2019-11-06 21:22:02,740 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2019-11-06 21:22:02,741 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 14 [2019-11-06 21:22:02,742 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 21:22:02,749 INFO L225 Difference]: With dead ends: 40 [2019-11-06 21:22:02,749 INFO L226 Difference]: Without dead ends: 23 [2019-11-06 21:22:02,752 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2019-11-06 21:22:02,769 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2019-11-06 21:22:02,786 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 20. [2019-11-06 21:22:02,787 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2019-11-06 21:22:02,788 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 24 transitions. [2019-11-06 21:22:02,790 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 24 transitions. Word has length 14 [2019-11-06 21:22:02,790 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 21:22:02,790 INFO L462 AbstractCegarLoop]: Abstraction has 20 states and 24 transitions. [2019-11-06 21:22:02,790 INFO L463 AbstractCegarLoop]: Interpolant automaton has 4 states. [2019-11-06 21:22:02,790 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 24 transitions. [2019-11-06 21:22:02,791 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2019-11-06 21:22:02,791 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 21:22:02,792 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 21:22:02,792 INFO L410 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 21:22:02,792 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 21:22:02,793 INFO L82 PathProgramCache]: Analyzing trace with hash -1519544262, now seen corresponding path program 1 times [2019-11-06 21:22:02,793 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 21:22:02,793 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1359853520] [2019-11-06 21:22:02,793 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 21:22:02,811 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:22:02,852 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:22:02,857 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:22:02,858 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1359853520] [2019-11-06 21:22:02,858 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2064554961] [2019-11-06 21:22:02,858 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:22:02,907 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:22:02,910 INFO L256 TraceCheckSpWp]: Trace formula consists of 63 conjuncts, 2 conjunts are in the unsatisfiable core [2019-11-06 21:22:02,918 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 21:22:02,946 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-11-06 21:22:02,947 INFO L218 FreeRefinementEngine]: Constructing automaton from 1 perfect and 1 imperfect interpolant sequences. [2019-11-06 21:22:02,947 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [5] total 6 [2019-11-06 21:22:02,949 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2026910750] [2019-11-06 21:22:02,949 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-11-06 21:22:02,950 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 21:22:02,950 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-11-06 21:22:02,950 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2019-11-06 21:22:02,950 INFO L87 Difference]: Start difference. First operand 20 states and 24 transitions. Second operand 3 states. [2019-11-06 21:22:02,984 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 21:22:02,985 INFO L93 Difference]: Finished difference Result 37 states and 47 transitions. [2019-11-06 21:22:02,985 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-11-06 21:22:02,986 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 17 [2019-11-06 21:22:02,986 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 21:22:02,989 INFO L225 Difference]: With dead ends: 37 [2019-11-06 21:22:02,989 INFO L226 Difference]: Without dead ends: 23 [2019-11-06 21:22:02,990 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 18 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2019-11-06 21:22:02,991 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2019-11-06 21:22:03,000 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 21. [2019-11-06 21:22:03,000 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2019-11-06 21:22:03,001 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 25 transitions. [2019-11-06 21:22:03,002 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 25 transitions. Word has length 17 [2019-11-06 21:22:03,002 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 21:22:03,002 INFO L462 AbstractCegarLoop]: Abstraction has 21 states and 25 transitions. [2019-11-06 21:22:03,002 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-11-06 21:22:03,003 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 25 transitions. [2019-11-06 21:22:03,003 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2019-11-06 21:22:03,003 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 21:22:03,004 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 21:22:03,208 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:22:03,208 INFO L410 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 21:22:03,209 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 21:22:03,209 INFO L82 PathProgramCache]: Analyzing trace with hash -1517697220, now seen corresponding path program 1 times [2019-11-06 21:22:03,210 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 21:22:03,210 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1617717500] [2019-11-06 21:22:03,211 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 21:22:03,225 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:22:03,297 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:22:03,303 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:22:03,303 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1617717500] [2019-11-06 21:22:03,303 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [969359632] [2019-11-06 21:22:03,305 INFO L94 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 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:22:03,348 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:22:03,350 INFO L256 TraceCheckSpWp]: Trace formula consists of 58 conjuncts, 3 conjunts are in the unsatisfiable core [2019-11-06 21:22:03,352 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 21:22:03,362 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:22:03,362 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 21:22:03,362 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 4] total 5 [2019-11-06 21:22:03,363 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [169394591] [2019-11-06 21:22:03,364 INFO L442 AbstractCegarLoop]: Interpolant automaton has 5 states [2019-11-06 21:22:03,364 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 21:22:03,365 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2019-11-06 21:22:03,366 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2019-11-06 21:22:03,366 INFO L87 Difference]: Start difference. First operand 21 states and 25 transitions. Second operand 5 states. [2019-11-06 21:22:03,432 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 21:22:03,432 INFO L93 Difference]: Finished difference Result 42 states and 53 transitions. [2019-11-06 21:22:03,433 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2019-11-06 21:22:03,433 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 17 [2019-11-06 21:22:03,433 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 21:22:03,434 INFO L225 Difference]: With dead ends: 42 [2019-11-06 21:22:03,434 INFO L226 Difference]: Without dead ends: 27 [2019-11-06 21:22:03,435 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 19 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2019-11-06 21:22:03,435 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2019-11-06 21:22:03,439 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 24. [2019-11-06 21:22:03,440 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2019-11-06 21:22:03,441 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 29 transitions. [2019-11-06 21:22:03,441 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 29 transitions. Word has length 17 [2019-11-06 21:22:03,441 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 21:22:03,441 INFO L462 AbstractCegarLoop]: Abstraction has 24 states and 29 transitions. [2019-11-06 21:22:03,442 INFO L463 AbstractCegarLoop]: Interpolant automaton has 5 states. [2019-11-06 21:22:03,442 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 29 transitions. [2019-11-06 21:22:03,442 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2019-11-06 21:22:03,443 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 21:22:03,443 INFO L410 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 21:22:03,646 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:22:03,647 INFO L410 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 21:22:03,647 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 21:22:03,647 INFO L82 PathProgramCache]: Analyzing trace with hash -446333304, now seen corresponding path program 2 times [2019-11-06 21:22:03,647 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 21:22:03,648 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [541018629] [2019-11-06 21:22:03,648 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 21:22:03,674 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:22:03,753 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:22:03,756 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:22:03,756 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [541018629] [2019-11-06 21:22:03,757 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [123048363] [2019-11-06 21:22:03,757 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:22:03,806 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-11-06 21:22:03,807 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 21:22:03,808 INFO L256 TraceCheckSpWp]: Trace formula consists of 65 conjuncts, 4 conjunts are in the unsatisfiable core [2019-11-06 21:22:03,814 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 21:22:03,867 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2019-11-06 21:22:03,868 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 21:22:03,868 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 5] total 10 [2019-11-06 21:22:03,868 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [787198380] [2019-11-06 21:22:03,871 INFO L442 AbstractCegarLoop]: Interpolant automaton has 10 states [2019-11-06 21:22:03,871 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 21:22:03,872 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2019-11-06 21:22:03,872 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=69, Unknown=0, NotChecked=0, Total=90 [2019-11-06 21:22:03,872 INFO L87 Difference]: Start difference. First operand 24 states and 29 transitions. Second operand 10 states. [2019-11-06 21:22:04,241 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 21:22:04,241 INFO L93 Difference]: Finished difference Result 75 states and 100 transitions. [2019-11-06 21:22:04,242 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2019-11-06 21:22:04,242 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 20 [2019-11-06 21:22:04,242 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 21:22:04,245 INFO L225 Difference]: With dead ends: 75 [2019-11-06 21:22:04,245 INFO L226 Difference]: Without dead ends: 57 [2019-11-06 21:22:04,248 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 21 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=61, Invalid=179, Unknown=0, NotChecked=0, Total=240 [2019-11-06 21:22:04,249 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2019-11-06 21:22:04,265 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 39. [2019-11-06 21:22:04,266 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2019-11-06 21:22:04,267 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 48 transitions. [2019-11-06 21:22:04,268 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 48 transitions. Word has length 20 [2019-11-06 21:22:04,268 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 21:22:04,268 INFO L462 AbstractCegarLoop]: Abstraction has 39 states and 48 transitions. [2019-11-06 21:22:04,268 INFO L463 AbstractCegarLoop]: Interpolant automaton has 10 states. [2019-11-06 21:22:04,268 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 48 transitions. [2019-11-06 21:22:04,271 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2019-11-06 21:22:04,271 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 21:22:04,271 INFO L410 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 21:22:04,475 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:22:04,475 INFO L410 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 21:22:04,475 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 21:22:04,475 INFO L82 PathProgramCache]: Analyzing trace with hash -389075002, now seen corresponding path program 1 times [2019-11-06 21:22:04,476 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 21:22:04,476 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1214517382] [2019-11-06 21:22:04,476 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 21:22:04,488 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:22:04,550 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:22:04,556 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:22:04,557 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1214517382] [2019-11-06 21:22:04,558 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [195827995] [2019-11-06 21:22:04,558 INFO L94 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 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:22:04,593 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:22:04,594 INFO L256 TraceCheckSpWp]: Trace formula consists of 62 conjuncts, 3 conjunts are in the unsatisfiable core [2019-11-06 21:22:04,596 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 21:22:04,636 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 5 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:22:04,636 INFO L218 FreeRefinementEngine]: Constructing automaton from 1 perfect and 1 imperfect interpolant sequences. [2019-11-06 21:22:04,636 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [6] total 8 [2019-11-06 21:22:04,637 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [432221335] [2019-11-06 21:22:04,637 INFO L442 AbstractCegarLoop]: Interpolant automaton has 4 states [2019-11-06 21:22:04,638 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 21:22:04,638 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2019-11-06 21:22:04,638 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=41, Unknown=0, NotChecked=0, Total=56 [2019-11-06 21:22:04,638 INFO L87 Difference]: Start difference. First operand 39 states and 48 transitions. Second operand 4 states. [2019-11-06 21:22:04,693 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 21:22:04,693 INFO L93 Difference]: Finished difference Result 92 states and 119 transitions. [2019-11-06 21:22:04,693 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2019-11-06 21:22:04,693 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 20 [2019-11-06 21:22:04,694 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 21:22:04,695 INFO L225 Difference]: With dead ends: 92 [2019-11-06 21:22:04,695 INFO L226 Difference]: Without dead ends: 59 [2019-11-06 21:22:04,696 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=41, Unknown=0, NotChecked=0, Total=56 [2019-11-06 21:22:04,696 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2019-11-06 21:22:04,706 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 48. [2019-11-06 21:22:04,706 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2019-11-06 21:22:04,707 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 60 transitions. [2019-11-06 21:22:04,708 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 60 transitions. Word has length 20 [2019-11-06 21:22:04,708 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 21:22:04,708 INFO L462 AbstractCegarLoop]: Abstraction has 48 states and 60 transitions. [2019-11-06 21:22:04,708 INFO L463 AbstractCegarLoop]: Interpolant automaton has 4 states. [2019-11-06 21:22:04,708 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 60 transitions. [2019-11-06 21:22:04,709 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2019-11-06 21:22:04,709 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 21:22:04,709 INFO L410 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 21:22:04,912 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:22:04,913 INFO L410 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 21:22:04,913 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 21:22:04,914 INFO L82 PathProgramCache]: Analyzing trace with hash 290983368, now seen corresponding path program 1 times [2019-11-06 21:22:04,914 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 21:22:04,914 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [193523794] [2019-11-06 21:22:04,915 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 21:22:04,929 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:22:04,976 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:22:04,978 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:22:04,978 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [193523794] [2019-11-06 21:22:04,979 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [34035699] [2019-11-06 21:22:04,979 INFO L94 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 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:22:05,012 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:22:05,013 INFO L256 TraceCheckSpWp]: Trace formula consists of 59 conjuncts, 4 conjunts are in the unsatisfiable core [2019-11-06 21:22:05,014 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 21:22:05,019 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:22:05,019 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 21:22:05,019 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5] total 6 [2019-11-06 21:22:05,020 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [84298668] [2019-11-06 21:22:05,020 INFO L442 AbstractCegarLoop]: Interpolant automaton has 6 states [2019-11-06 21:22:05,020 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 21:22:05,020 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2019-11-06 21:22:05,021 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2019-11-06 21:22:05,021 INFO L87 Difference]: Start difference. First operand 48 states and 60 transitions. Second operand 6 states. [2019-11-06 21:22:05,110 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 21:22:05,110 INFO L93 Difference]: Finished difference Result 110 states and 142 transitions. [2019-11-06 21:22:05,110 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2019-11-06 21:22:05,110 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 20 [2019-11-06 21:22:05,111 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 21:22:05,112 INFO L225 Difference]: With dead ends: 110 [2019-11-06 21:22:05,112 INFO L226 Difference]: Without dead ends: 68 [2019-11-06 21:22:05,113 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 22 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2019-11-06 21:22:05,113 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2019-11-06 21:22:05,121 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 59. [2019-11-06 21:22:05,122 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 59 states. [2019-11-06 21:22:05,123 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 73 transitions. [2019-11-06 21:22:05,123 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 73 transitions. Word has length 20 [2019-11-06 21:22:05,123 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 21:22:05,124 INFO L462 AbstractCegarLoop]: Abstraction has 59 states and 73 transitions. [2019-11-06 21:22:05,124 INFO L463 AbstractCegarLoop]: Interpolant automaton has 6 states. [2019-11-06 21:22:05,124 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 73 transitions. [2019-11-06 21:22:05,125 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2019-11-06 21:22:05,125 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 21:22:05,125 INFO L410 BasicCegarLoop]: trace histogram [3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 21:22:05,334 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:22:05,335 INFO L410 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 21:22:05,336 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 21:22:05,336 INFO L82 PathProgramCache]: Analyzing trace with hash 1649593786, now seen corresponding path program 2 times [2019-11-06 21:22:05,336 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 21:22:05,337 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [349790824] [2019-11-06 21:22:05,337 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 21:22:05,349 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:22:05,398 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:22:05,400 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:22:05,401 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [349790824] [2019-11-06 21:22:05,401 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [215869004] [2019-11-06 21:22:05,401 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:22:05,439 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-11-06 21:22:05,439 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 21:22:05,440 INFO L256 TraceCheckSpWp]: Trace formula consists of 63 conjuncts, 5 conjunts are in the unsatisfiable core [2019-11-06 21:22:05,442 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 21:22:05,448 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:22:05,449 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 21:22:05,449 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6] total 7 [2019-11-06 21:22:05,449 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1243346776] [2019-11-06 21:22:05,450 INFO L442 AbstractCegarLoop]: Interpolant automaton has 7 states [2019-11-06 21:22:05,450 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 21:22:05,450 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2019-11-06 21:22:05,451 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2019-11-06 21:22:05,451 INFO L87 Difference]: Start difference. First operand 59 states and 73 transitions. Second operand 7 states. [2019-11-06 21:22:05,556 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 21:22:05,556 INFO L93 Difference]: Finished difference Result 133 states and 169 transitions. [2019-11-06 21:22:05,557 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2019-11-06 21:22:05,557 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 23 [2019-11-06 21:22:05,557 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 21:22:05,558 INFO L225 Difference]: With dead ends: 133 [2019-11-06 21:22:05,559 INFO L226 Difference]: Without dead ends: 80 [2019-11-06 21:22:05,559 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 25 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2019-11-06 21:22:05,560 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 80 states. [2019-11-06 21:22:05,569 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 80 to 71. [2019-11-06 21:22:05,569 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 71 states. [2019-11-06 21:22:05,570 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 87 transitions. [2019-11-06 21:22:05,571 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 87 transitions. Word has length 23 [2019-11-06 21:22:05,571 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 21:22:05,571 INFO L462 AbstractCegarLoop]: Abstraction has 71 states and 87 transitions. [2019-11-06 21:22:05,571 INFO L463 AbstractCegarLoop]: Interpolant automaton has 7 states. [2019-11-06 21:22:05,571 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 87 transitions. [2019-11-06 21:22:05,572 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2019-11-06 21:22:05,573 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 21:22:05,573 INFO L410 BasicCegarLoop]: trace histogram [4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 21:22:05,784 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:22:05,785 INFO L410 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 21:22:05,785 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 21:22:05,785 INFO L82 PathProgramCache]: Analyzing trace with hash 240758920, now seen corresponding path program 3 times [2019-11-06 21:22:05,785 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 21:22:05,785 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [695818170] [2019-11-06 21:22:05,786 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 21:22:05,794 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:22:05,834 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:22:05,837 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 0 proven. 22 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:22:05,838 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [695818170] [2019-11-06 21:22:05,838 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1718197076] [2019-11-06 21:22:05,838 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:22:05,888 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2019-11-06 21:22:05,889 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 21:22:05,890 INFO L256 TraceCheckSpWp]: Trace formula consists of 59 conjuncts, 17 conjunts are in the unsatisfiable core [2019-11-06 21:22:05,891 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 21:22:05,977 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-06 21:22:06,016 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 10 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2019-11-06 21:22:06,016 INFO L218 FreeRefinementEngine]: Constructing automaton from 1 perfect and 1 imperfect interpolant sequences. [2019-11-06 21:22:06,016 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [8] total 15 [2019-11-06 21:22:06,017 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1145452906] [2019-11-06 21:22:06,018 INFO L442 AbstractCegarLoop]: Interpolant automaton has 9 states [2019-11-06 21:22:06,018 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 21:22:06,018 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2019-11-06 21:22:06,018 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=168, Unknown=0, NotChecked=0, Total=210 [2019-11-06 21:22:06,018 INFO L87 Difference]: Start difference. First operand 71 states and 87 transitions. Second operand 9 states. [2019-11-06 21:22:06,114 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 21:22:06,114 INFO L93 Difference]: Finished difference Result 124 states and 151 transitions. [2019-11-06 21:22:06,119 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2019-11-06 21:22:06,119 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 26 [2019-11-06 21:22:06,119 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 21:22:06,121 INFO L225 Difference]: With dead ends: 124 [2019-11-06 21:22:06,121 INFO L226 Difference]: Without dead ends: 122 [2019-11-06 21:22:06,122 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 48 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=46, Invalid=194, Unknown=0, NotChecked=0, Total=240 [2019-11-06 21:22:06,122 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 122 states. [2019-11-06 21:22:06,136 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 122 to 120. [2019-11-06 21:22:06,136 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 120 states. [2019-11-06 21:22:06,138 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 120 states to 120 states and 146 transitions. [2019-11-06 21:22:06,139 INFO L78 Accepts]: Start accepts. Automaton has 120 states and 146 transitions. Word has length 26 [2019-11-06 21:22:06,139 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 21:22:06,139 INFO L462 AbstractCegarLoop]: Abstraction has 120 states and 146 transitions. [2019-11-06 21:22:06,139 INFO L463 AbstractCegarLoop]: Interpolant automaton has 9 states. [2019-11-06 21:22:06,139 INFO L276 IsEmpty]: Start isEmpty. Operand 120 states and 146 transitions. [2019-11-06 21:22:06,140 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2019-11-06 21:22:06,140 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 21:22:06,141 INFO L410 BasicCegarLoop]: trace histogram [4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 21:22:06,344 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:22:06,344 INFO L410 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 21:22:06,344 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 21:22:06,345 INFO L82 PathProgramCache]: Analyzing trace with hash -530780410, now seen corresponding path program 1 times [2019-11-06 21:22:06,345 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 21:22:06,345 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [525970313] [2019-11-06 21:22:06,346 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 21:22:06,355 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:22:06,420 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:22:06,423 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 0 proven. 22 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:22:06,423 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [525970313] [2019-11-06 21:22:06,424 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [366036260] [2019-11-06 21:22:06,424 INFO L94 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 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:22:06,464 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:22:06,465 INFO L256 TraceCheckSpWp]: Trace formula consists of 70 conjuncts, 6 conjunts are in the unsatisfiable core [2019-11-06 21:22:06,467 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 21:22:06,498 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 0 proven. 22 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:22:06,499 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 21:22:06,499 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 7] total 13 [2019-11-06 21:22:06,500 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [285855744] [2019-11-06 21:22:06,500 INFO L442 AbstractCegarLoop]: Interpolant automaton has 13 states [2019-11-06 21:22:06,500 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 21:22:06,501 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2019-11-06 21:22:06,501 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=117, Unknown=0, NotChecked=0, Total=156 [2019-11-06 21:22:06,501 INFO L87 Difference]: Start difference. First operand 120 states and 146 transitions. Second operand 13 states. [2019-11-06 21:22:06,703 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 21:22:06,703 INFO L93 Difference]: Finished difference Result 263 states and 324 transitions. [2019-11-06 21:22:06,704 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2019-11-06 21:22:06,704 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 26 [2019-11-06 21:22:06,704 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 21:22:06,708 INFO L225 Difference]: With dead ends: 263 [2019-11-06 21:22:06,708 INFO L226 Difference]: Without dead ends: 182 [2019-11-06 21:22:06,709 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 25 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 55 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=127, Invalid=293, Unknown=0, NotChecked=0, Total=420 [2019-11-06 21:22:06,710 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 182 states. [2019-11-06 21:22:06,724 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 182 to 141. [2019-11-06 21:22:06,724 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 141 states. [2019-11-06 21:22:06,726 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 141 states to 141 states and 170 transitions. [2019-11-06 21:22:06,726 INFO L78 Accepts]: Start accepts. Automaton has 141 states and 170 transitions. Word has length 26 [2019-11-06 21:22:06,727 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 21:22:06,727 INFO L462 AbstractCegarLoop]: Abstraction has 141 states and 170 transitions. [2019-11-06 21:22:06,727 INFO L463 AbstractCegarLoop]: Interpolant automaton has 13 states. [2019-11-06 21:22:06,727 INFO L276 IsEmpty]: Start isEmpty. Operand 141 states and 170 transitions. [2019-11-06 21:22:06,728 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2019-11-06 21:22:06,728 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 21:22:06,728 INFO L410 BasicCegarLoop]: trace histogram [5, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 21:22:06,933 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:22:06,933 INFO L410 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 21:22:06,933 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 21:22:06,934 INFO L82 PathProgramCache]: Analyzing trace with hash -1873696640, now seen corresponding path program 2 times [2019-11-06 21:22:06,934 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 21:22:06,934 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1014243535] [2019-11-06 21:22:06,935 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 21:22:06,945 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:22:07,026 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:22:07,029 INFO L134 CoverageAnalysis]: Checked inductivity of 35 backedges. 0 proven. 35 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:22:07,029 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1014243535] [2019-11-06 21:22:07,029 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [576730063] [2019-11-06 21:22:07,029 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:22:07,056 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-11-06 21:22:07,056 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 21:22:07,057 INFO L256 TraceCheckSpWp]: Trace formula consists of 74 conjuncts, 5 conjunts are in the unsatisfiable core [2019-11-06 21:22:07,059 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 21:22:07,091 INFO L134 CoverageAnalysis]: Checked inductivity of 35 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2019-11-06 21:22:07,091 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 21:22:07,091 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 6] total 13 [2019-11-06 21:22:07,092 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1036935013] [2019-11-06 21:22:07,092 INFO L442 AbstractCegarLoop]: Interpolant automaton has 13 states [2019-11-06 21:22:07,093 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 21:22:07,093 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2019-11-06 21:22:07,093 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=121, Unknown=0, NotChecked=0, Total=156 [2019-11-06 21:22:07,093 INFO L87 Difference]: Start difference. First operand 141 states and 170 transitions. Second operand 13 states. [2019-11-06 21:22:07,595 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 21:22:07,595 INFO L93 Difference]: Finished difference Result 369 states and 461 transitions. [2019-11-06 21:22:07,595 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2019-11-06 21:22:07,595 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 29 [2019-11-06 21:22:07,596 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 21:22:07,599 INFO L225 Difference]: With dead ends: 369 [2019-11-06 21:22:07,599 INFO L226 Difference]: Without dead ends: 292 [2019-11-06 21:22:07,600 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 30 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 70 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=141, Invalid=411, Unknown=0, NotChecked=0, Total=552 [2019-11-06 21:22:07,600 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 292 states. [2019-11-06 21:22:07,615 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 292 to 135. [2019-11-06 21:22:07,615 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 135 states. [2019-11-06 21:22:07,617 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 135 states to 135 states and 164 transitions. [2019-11-06 21:22:07,617 INFO L78 Accepts]: Start accepts. Automaton has 135 states and 164 transitions. Word has length 29 [2019-11-06 21:22:07,617 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 21:22:07,617 INFO L462 AbstractCegarLoop]: Abstraction has 135 states and 164 transitions. [2019-11-06 21:22:07,617 INFO L463 AbstractCegarLoop]: Interpolant automaton has 13 states. [2019-11-06 21:22:07,617 INFO L276 IsEmpty]: Start isEmpty. Operand 135 states and 164 transitions. [2019-11-06 21:22:07,618 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2019-11-06 21:22:07,618 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 21:22:07,619 INFO L410 BasicCegarLoop]: trace histogram [5, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 21:22:07,831 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:22:07,832 INFO L410 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 21:22:07,832 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 21:22:07,832 INFO L82 PathProgramCache]: Analyzing trace with hash 1706989628, now seen corresponding path program 3 times [2019-11-06 21:22:07,833 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 21:22:07,833 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1371357348] [2019-11-06 21:22:07,833 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 21:22:07,842 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:22:07,899 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:22:07,901 INFO L134 CoverageAnalysis]: Checked inductivity of 35 backedges. 0 proven. 35 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:22:07,901 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1371357348] [2019-11-06 21:22:07,901 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1336297873] [2019-11-06 21:22:07,901 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:22:07,941 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2019-11-06 21:22:07,941 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 21:22:07,941 INFO L256 TraceCheckSpWp]: Trace formula consists of 55 conjuncts, 5 conjunts are in the unsatisfiable core [2019-11-06 21:22:07,943 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 21:22:07,984 INFO L134 CoverageAnalysis]: Checked inductivity of 35 backedges. 9 proven. 0 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2019-11-06 21:22:07,984 INFO L218 FreeRefinementEngine]: Constructing automaton from 1 perfect and 1 imperfect interpolant sequences. [2019-11-06 21:22:07,984 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [11] total 13 [2019-11-06 21:22:07,984 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [319876673] [2019-11-06 21:22:07,985 INFO L442 AbstractCegarLoop]: Interpolant automaton has 4 states [2019-11-06 21:22:07,985 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 21:22:07,985 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2019-11-06 21:22:07,986 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=122, Unknown=0, NotChecked=0, Total=156 [2019-11-06 21:22:07,986 INFO L87 Difference]: Start difference. First operand 135 states and 164 transitions. Second operand 4 states. [2019-11-06 21:22:08,054 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 21:22:08,054 INFO L93 Difference]: Finished difference Result 253 states and 309 transitions. [2019-11-06 21:22:08,055 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2019-11-06 21:22:08,055 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 29 [2019-11-06 21:22:08,055 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 21:22:08,056 INFO L225 Difference]: With dead ends: 253 [2019-11-06 21:22:08,057 INFO L226 Difference]: Without dead ends: 179 [2019-11-06 21:22:08,057 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 29 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=39, Invalid=143, Unknown=0, NotChecked=0, Total=182 [2019-11-06 21:22:08,058 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 179 states. [2019-11-06 21:22:08,069 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 179 to 141. [2019-11-06 21:22:08,070 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 141 states. [2019-11-06 21:22:08,071 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 141 states to 141 states and 170 transitions. [2019-11-06 21:22:08,071 INFO L78 Accepts]: Start accepts. Automaton has 141 states and 170 transitions. Word has length 29 [2019-11-06 21:22:08,071 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 21:22:08,072 INFO L462 AbstractCegarLoop]: Abstraction has 141 states and 170 transitions. [2019-11-06 21:22:08,072 INFO L463 AbstractCegarLoop]: Interpolant automaton has 4 states. [2019-11-06 21:22:08,072 INFO L276 IsEmpty]: Start isEmpty. Operand 141 states and 170 transitions. [2019-11-06 21:22:08,073 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2019-11-06 21:22:08,073 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 21:22:08,073 INFO L410 BasicCegarLoop]: trace histogram [5, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 21:22:08,283 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:22:08,283 INFO L410 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 21:22:08,284 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 21:22:08,284 INFO L82 PathProgramCache]: Analyzing trace with hash -252932420, now seen corresponding path program 4 times [2019-11-06 21:22:08,284 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 21:22:08,284 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [250746783] [2019-11-06 21:22:08,284 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 21:22:08,292 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:22:08,343 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:22:08,346 INFO L134 CoverageAnalysis]: Checked inductivity of 35 backedges. 0 proven. 35 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:22:08,346 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [250746783] [2019-11-06 21:22:08,346 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1768402022] [2019-11-06 21:22:08,347 INFO L92 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:22:08,376 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-11-06 21:22:08,376 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 21:22:08,377 INFO L256 TraceCheckSpWp]: Trace formula consists of 74 conjuncts, 7 conjunts are in the unsatisfiable core [2019-11-06 21:22:08,378 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 21:22:08,384 INFO L134 CoverageAnalysis]: Checked inductivity of 35 backedges. 0 proven. 35 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:22:08,384 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 21:22:08,384 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8] total 9 [2019-11-06 21:22:08,385 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1968058864] [2019-11-06 21:22:08,385 INFO L442 AbstractCegarLoop]: Interpolant automaton has 9 states [2019-11-06 21:22:08,385 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 21:22:08,385 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2019-11-06 21:22:08,386 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=42, Unknown=0, NotChecked=0, Total=72 [2019-11-06 21:22:08,386 INFO L87 Difference]: Start difference. First operand 141 states and 170 transitions. Second operand 9 states. [2019-11-06 21:22:08,514 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 21:22:08,514 INFO L93 Difference]: Finished difference Result 276 states and 340 transitions. [2019-11-06 21:22:08,515 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2019-11-06 21:22:08,515 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 29 [2019-11-06 21:22:08,515 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 21:22:08,516 INFO L225 Difference]: With dead ends: 276 [2019-11-06 21:22:08,517 INFO L226 Difference]: Without dead ends: 182 [2019-11-06 21:22:08,517 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 31 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=30, Invalid=42, Unknown=0, NotChecked=0, Total=72 [2019-11-06 21:22:08,518 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 182 states. [2019-11-06 21:22:08,528 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 182 to 162. [2019-11-06 21:22:08,528 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 162 states. [2019-11-06 21:22:08,529 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 162 states to 162 states and 194 transitions. [2019-11-06 21:22:08,530 INFO L78 Accepts]: Start accepts. Automaton has 162 states and 194 transitions. Word has length 29 [2019-11-06 21:22:08,530 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 21:22:08,530 INFO L462 AbstractCegarLoop]: Abstraction has 162 states and 194 transitions. [2019-11-06 21:22:08,530 INFO L463 AbstractCegarLoop]: Interpolant automaton has 9 states. [2019-11-06 21:22:08,530 INFO L276 IsEmpty]: Start isEmpty. Operand 162 states and 194 transitions. [2019-11-06 21:22:08,531 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2019-11-06 21:22:08,532 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 21:22:08,532 INFO L410 BasicCegarLoop]: trace histogram [6, 6, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 21:22:08,736 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:22:08,736 INFO L410 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 21:22:08,736 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 21:22:08,736 INFO L82 PathProgramCache]: Analyzing trace with hash -1328098874, now seen corresponding path program 5 times [2019-11-06 21:22:08,737 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 21:22:08,737 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [814520155] [2019-11-06 21:22:08,737 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 21:22:08,745 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:22:08,802 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:22:08,804 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 0 proven. 51 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:22:08,804 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [814520155] [2019-11-06 21:22:08,805 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [116142008] [2019-11-06 21:22:08,805 INFO L92 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:22:08,857 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 7 check-sat command(s) [2019-11-06 21:22:08,858 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 21:22:08,858 INFO L256 TraceCheckSpWp]: Trace formula consists of 78 conjuncts, 8 conjunts are in the unsatisfiable core [2019-11-06 21:22:08,864 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 21:22:08,883 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 0 proven. 51 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:22:08,883 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 21:22:08,883 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9] total 10 [2019-11-06 21:22:08,883 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [936217661] [2019-11-06 21:22:08,884 INFO L442 AbstractCegarLoop]: Interpolant automaton has 10 states [2019-11-06 21:22:08,884 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 21:22:08,884 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2019-11-06 21:22:08,884 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=52, Unknown=0, NotChecked=0, Total=90 [2019-11-06 21:22:08,885 INFO L87 Difference]: Start difference. First operand 162 states and 194 transitions. Second operand 10 states. [2019-11-06 21:22:08,993 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 21:22:08,994 INFO L93 Difference]: Finished difference Result 309 states and 378 transitions. [2019-11-06 21:22:08,994 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2019-11-06 21:22:08,994 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 32 [2019-11-06 21:22:08,994 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 21:22:08,996 INFO L225 Difference]: With dead ends: 309 [2019-11-06 21:22:08,996 INFO L226 Difference]: Without dead ends: 203 [2019-11-06 21:22:08,997 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 34 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=38, Invalid=52, Unknown=0, NotChecked=0, Total=90 [2019-11-06 21:22:08,997 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 203 states. [2019-11-06 21:22:09,007 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 203 to 183. [2019-11-06 21:22:09,008 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 183 states. [2019-11-06 21:22:09,009 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 183 states to 183 states and 218 transitions. [2019-11-06 21:22:09,009 INFO L78 Accepts]: Start accepts. Automaton has 183 states and 218 transitions. Word has length 32 [2019-11-06 21:22:09,009 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 21:22:09,009 INFO L462 AbstractCegarLoop]: Abstraction has 183 states and 218 transitions. [2019-11-06 21:22:09,009 INFO L463 AbstractCegarLoop]: Interpolant automaton has 10 states. [2019-11-06 21:22:09,009 INFO L276 IsEmpty]: Start isEmpty. Operand 183 states and 218 transitions. [2019-11-06 21:22:09,010 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2019-11-06 21:22:09,011 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 21:22:09,011 INFO L410 BasicCegarLoop]: trace histogram [7, 7, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 21:22:09,214 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:22:09,214 INFO L410 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 21:22:09,214 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 21:22:09,215 INFO L82 PathProgramCache]: Analyzing trace with hash 254163580, now seen corresponding path program 6 times [2019-11-06 21:22:09,215 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 21:22:09,215 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1580748113] [2019-11-06 21:22:09,216 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 21:22:09,225 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:22:09,297 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:22:09,299 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 0 proven. 70 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:22:09,300 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1580748113] [2019-11-06 21:22:09,300 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1042971049] [2019-11-06 21:22:09,300 INFO L92 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:22:09,332 INFO L249 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 5 check-sat command(s) [2019-11-06 21:22:09,332 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 21:22:09,333 INFO L256 TraceCheckSpWp]: Trace formula consists of 70 conjuncts, 18 conjunts are in the unsatisfiable core [2019-11-06 21:22:09,335 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 21:22:09,446 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-06 21:22:09,479 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 19 proven. 0 refuted. 0 times theorem prover too weak. 51 trivial. 0 not checked. [2019-11-06 21:22:09,479 INFO L218 FreeRefinementEngine]: Constructing automaton from 1 perfect and 1 imperfect interpolant sequences. [2019-11-06 21:22:09,479 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [11] total 18 [2019-11-06 21:22:09,480 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2055041420] [2019-11-06 21:22:09,480 INFO L442 AbstractCegarLoop]: Interpolant automaton has 9 states [2019-11-06 21:22:09,480 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 21:22:09,481 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2019-11-06 21:22:09,481 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=65, Invalid=241, Unknown=0, NotChecked=0, Total=306 [2019-11-06 21:22:09,481 INFO L87 Difference]: Start difference. First operand 183 states and 218 transitions. Second operand 9 states. [2019-11-06 21:22:09,641 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 21:22:09,641 INFO L93 Difference]: Finished difference Result 192 states and 227 transitions. [2019-11-06 21:22:09,642 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2019-11-06 21:22:09,642 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 35 [2019-11-06 21:22:09,642 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 21:22:09,646 INFO L225 Difference]: With dead ends: 192 [2019-11-06 21:22:09,646 INFO L226 Difference]: Without dead ends: 190 [2019-11-06 21:22:09,648 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 30 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 69 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=74, Invalid=306, Unknown=0, NotChecked=0, Total=380 [2019-11-06 21:22:09,649 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 190 states. [2019-11-06 21:22:09,660 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 190 to 183. [2019-11-06 21:22:09,660 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 183 states. [2019-11-06 21:22:09,661 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 183 states to 183 states and 218 transitions. [2019-11-06 21:22:09,661 INFO L78 Accepts]: Start accepts. Automaton has 183 states and 218 transitions. Word has length 35 [2019-11-06 21:22:09,662 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 21:22:09,662 INFO L462 AbstractCegarLoop]: Abstraction has 183 states and 218 transitions. [2019-11-06 21:22:09,662 INFO L463 AbstractCegarLoop]: Interpolant automaton has 9 states. [2019-11-06 21:22:09,662 INFO L276 IsEmpty]: Start isEmpty. Operand 183 states and 218 transitions. [2019-11-06 21:22:09,663 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2019-11-06 21:22:09,663 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 21:22:09,663 INFO L410 BasicCegarLoop]: trace histogram [7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 21:22:09,867 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:22:09,867 INFO L410 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 21:22:09,867 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 21:22:09,868 INFO L82 PathProgramCache]: Analyzing trace with hash 989633210, now seen corresponding path program 1 times [2019-11-06 21:22:09,868 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 21:22:09,868 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1832062231] [2019-11-06 21:22:09,869 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 21:22:09,876 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:22:09,927 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:22:09,931 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 70 trivial. 0 not checked. [2019-11-06 21:22:09,931 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1832062231] [2019-11-06 21:22:09,931 INFO L218 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-06 21:22:09,931 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2019-11-06 21:22:09,932 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1324222536] [2019-11-06 21:22:09,932 INFO L442 AbstractCegarLoop]: Interpolant automaton has 5 states [2019-11-06 21:22:09,932 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 21:22:09,932 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2019-11-06 21:22:09,933 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2019-11-06 21:22:09,933 INFO L87 Difference]: Start difference. First operand 183 states and 218 transitions. Second operand 5 states. [2019-11-06 21:22:09,971 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 21:22:09,971 INFO L93 Difference]: Finished difference Result 291 states and 351 transitions. [2019-11-06 21:22:09,971 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2019-11-06 21:22:09,971 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 35 [2019-11-06 21:22:09,972 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 21:22:09,973 INFO L225 Difference]: With dead ends: 291 [2019-11-06 21:22:09,973 INFO L226 Difference]: Without dead ends: 190 [2019-11-06 21:22:09,974 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2019-11-06 21:22:09,974 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 190 states. [2019-11-06 21:22:09,986 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 190 to 179. [2019-11-06 21:22:09,987 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 179 states. [2019-11-06 21:22:09,988 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 179 states to 179 states and 212 transitions. [2019-11-06 21:22:09,988 INFO L78 Accepts]: Start accepts. Automaton has 179 states and 212 transitions. Word has length 35 [2019-11-06 21:22:09,988 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 21:22:09,988 INFO L462 AbstractCegarLoop]: Abstraction has 179 states and 212 transitions. [2019-11-06 21:22:09,989 INFO L463 AbstractCegarLoop]: Interpolant automaton has 5 states. [2019-11-06 21:22:09,989 INFO L276 IsEmpty]: Start isEmpty. Operand 179 states and 212 transitions. [2019-11-06 21:22:09,990 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2019-11-06 21:22:09,990 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 21:22:09,990 INFO L410 BasicCegarLoop]: trace histogram [14, 14, 12, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 21:22:09,990 INFO L410 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 21:22:09,991 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 21:22:09,991 INFO L82 PathProgramCache]: Analyzing trace with hash 75585305, now seen corresponding path program 1 times [2019-11-06 21:22:09,991 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 21:22:09,991 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1960988771] [2019-11-06 21:22:09,991 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 21:22:10,004 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:22:10,227 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:22:10,230 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:22:10,236 INFO L134 CoverageAnalysis]: Checked inductivity of 308 backedges. 19 proven. 289 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:22:10,236 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1960988771] [2019-11-06 21:22:10,237 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [698717223] [2019-11-06 21:22:10,237 INFO L94 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 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:22:10,274 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:22:10,275 INFO L256 TraceCheckSpWp]: Trace formula consists of 130 conjuncts, 9 conjunts are in the unsatisfiable core [2019-11-06 21:22:10,277 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 21:22:10,382 INFO L134 CoverageAnalysis]: Checked inductivity of 308 backedges. 163 proven. 70 refuted. 0 times theorem prover too weak. 75 trivial. 0 not checked. [2019-11-06 21:22:10,382 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 21:22:10,383 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 10] total 28 [2019-11-06 21:22:10,383 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [131013346] [2019-11-06 21:22:10,383 INFO L442 AbstractCegarLoop]: Interpolant automaton has 28 states [2019-11-06 21:22:10,384 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 21:22:10,384 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2019-11-06 21:22:10,384 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=201, Invalid=555, Unknown=0, NotChecked=0, Total=756 [2019-11-06 21:22:10,385 INFO L87 Difference]: Start difference. First operand 179 states and 212 transitions. Second operand 28 states. [2019-11-06 21:22:10,923 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 21:22:10,923 INFO L93 Difference]: Finished difference Result 409 states and 481 transitions. [2019-11-06 21:22:10,923 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2019-11-06 21:22:10,923 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 65 [2019-11-06 21:22:10,924 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 21:22:10,925 INFO L225 Difference]: With dead ends: 409 [2019-11-06 21:22:10,925 INFO L226 Difference]: Without dead ends: 295 [2019-11-06 21:22:10,927 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 108 GetRequests, 62 SyntacticMatches, 0 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 588 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=581, Invalid=1675, Unknown=0, NotChecked=0, Total=2256 [2019-11-06 21:22:10,927 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 295 states. [2019-11-06 21:22:10,938 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 295 to 200. [2019-11-06 21:22:10,938 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 200 states. [2019-11-06 21:22:10,939 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 200 states to 200 states and 236 transitions. [2019-11-06 21:22:10,939 INFO L78 Accepts]: Start accepts. Automaton has 200 states and 236 transitions. Word has length 65 [2019-11-06 21:22:10,940 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 21:22:10,940 INFO L462 AbstractCegarLoop]: Abstraction has 200 states and 236 transitions. [2019-11-06 21:22:10,940 INFO L463 AbstractCegarLoop]: Interpolant automaton has 28 states. [2019-11-06 21:22:10,940 INFO L276 IsEmpty]: Start isEmpty. Operand 200 states and 236 transitions. [2019-11-06 21:22:10,941 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2019-11-06 21:22:10,941 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 21:22:10,941 INFO L410 BasicCegarLoop]: trace histogram [16, 16, 14, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 21:22:11,145 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:22:11,145 INFO L410 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 21:22:11,145 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 21:22:11,146 INFO L82 PathProgramCache]: Analyzing trace with hash 1121061563, now seen corresponding path program 2 times [2019-11-06 21:22:11,146 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 21:22:11,146 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2051236578] [2019-11-06 21:22:11,146 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 21:22:11,156 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:22:11,393 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:22:11,396 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:22:11,404 INFO L134 CoverageAnalysis]: Checked inductivity of 399 backedges. 21 proven. 378 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:22:11,405 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2051236578] [2019-11-06 21:22:11,405 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [150219229] [2019-11-06 21:22:11,405 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:22:11,466 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-11-06 21:22:11,466 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 21:22:11,467 INFO L256 TraceCheckSpWp]: Trace formula consists of 138 conjuncts, 10 conjunts are in the unsatisfiable core [2019-11-06 21:22:11,473 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 21:22:11,569 INFO L134 CoverageAnalysis]: Checked inductivity of 399 backedges. 210 proven. 92 refuted. 0 times theorem prover too weak. 97 trivial. 0 not checked. [2019-11-06 21:22:11,569 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 21:22:11,570 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 11] total 31 [2019-11-06 21:22:11,570 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1338733385] [2019-11-06 21:22:11,570 INFO L442 AbstractCegarLoop]: Interpolant automaton has 31 states [2019-11-06 21:22:11,570 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 21:22:11,571 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2019-11-06 21:22:11,571 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=248, Invalid=682, Unknown=0, NotChecked=0, Total=930 [2019-11-06 21:22:11,571 INFO L87 Difference]: Start difference. First operand 200 states and 236 transitions. Second operand 31 states. [2019-11-06 21:22:12,267 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 21:22:12,267 INFO L93 Difference]: Finished difference Result 469 states and 546 transitions. [2019-11-06 21:22:12,268 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2019-11-06 21:22:12,268 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 71 [2019-11-06 21:22:12,268 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 21:22:12,270 INFO L225 Difference]: With dead ends: 469 [2019-11-06 21:22:12,270 INFO L226 Difference]: Without dead ends: 343 [2019-11-06 21:22:12,272 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 121 GetRequests, 67 SyntacticMatches, 0 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 829 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=798, Invalid=2282, Unknown=0, NotChecked=0, Total=3080 [2019-11-06 21:22:12,273 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 343 states. [2019-11-06 21:22:12,287 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 343 to 221. [2019-11-06 21:22:12,287 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 221 states. [2019-11-06 21:22:12,288 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 221 states to 221 states and 260 transitions. [2019-11-06 21:22:12,289 INFO L78 Accepts]: Start accepts. Automaton has 221 states and 260 transitions. Word has length 71 [2019-11-06 21:22:12,289 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 21:22:12,289 INFO L462 AbstractCegarLoop]: Abstraction has 221 states and 260 transitions. [2019-11-06 21:22:12,289 INFO L463 AbstractCegarLoop]: Interpolant automaton has 31 states. [2019-11-06 21:22:12,289 INFO L276 IsEmpty]: Start isEmpty. Operand 221 states and 260 transitions. [2019-11-06 21:22:12,290 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2019-11-06 21:22:12,291 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 21:22:12,291 INFO L410 BasicCegarLoop]: trace histogram [18, 18, 16, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 21:22:12,500 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:22:12,501 INFO L410 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 21:22:12,501 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 21:22:12,501 INFO L82 PathProgramCache]: Analyzing trace with hash -1811685799, now seen corresponding path program 3 times [2019-11-06 21:22:12,502 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 21:22:12,502 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1645888822] [2019-11-06 21:22:12,502 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 21:22:12,519 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:22:12,843 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:22:12,846 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:22:12,860 INFO L134 CoverageAnalysis]: Checked inductivity of 502 backedges. 23 proven. 479 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:22:12,860 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1645888822] [2019-11-06 21:22:12,861 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [539596750] [2019-11-06 21:22:12,861 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:22:12,929 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2019-11-06 21:22:12,930 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 21:22:12,931 INFO L256 TraceCheckSpWp]: Trace formula consists of 83 conjuncts, 21 conjunts are in the unsatisfiable core [2019-11-06 21:22:12,934 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 21:22:13,084 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-06 21:22:13,134 INFO L134 CoverageAnalysis]: Checked inductivity of 502 backedges. 27 proven. 266 refuted. 0 times theorem prover too weak. 209 trivial. 0 not checked. [2019-11-06 21:22:13,135 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 21:22:13,135 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 10] total 33 [2019-11-06 21:22:13,135 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1507936871] [2019-11-06 21:22:13,136 INFO L442 AbstractCegarLoop]: Interpolant automaton has 33 states [2019-11-06 21:22:13,136 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 21:22:13,137 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2019-11-06 21:22:13,137 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=168, Invalid=888, Unknown=0, NotChecked=0, Total=1056 [2019-11-06 21:22:13,137 INFO L87 Difference]: Start difference. First operand 221 states and 260 transitions. Second operand 33 states. [2019-11-06 21:22:17,139 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 21:22:17,140 INFO L93 Difference]: Finished difference Result 959 states and 1121 transitions. [2019-11-06 21:22:17,140 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 125 states. [2019-11-06 21:22:17,140 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 77 [2019-11-06 21:22:17,141 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 21:22:17,145 INFO L225 Difference]: With dead ends: 959 [2019-11-06 21:22:17,145 INFO L226 Difference]: Without dead ends: 895 [2019-11-06 21:22:17,152 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 212 GetRequests, 75 SyntacticMatches, 0 SemanticMatches, 137 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7334 ImplicationChecksByTransitivity, 3.1s TimeCoverageRelationStatistics Valid=3114, Invalid=16068, Unknown=0, NotChecked=0, Total=19182 [2019-11-06 21:22:17,153 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 895 states. [2019-11-06 21:22:17,203 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 895 to 559. [2019-11-06 21:22:17,203 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 559 states. [2019-11-06 21:22:17,205 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 559 states to 559 states and 649 transitions. [2019-11-06 21:22:17,206 INFO L78 Accepts]: Start accepts. Automaton has 559 states and 649 transitions. Word has length 77 [2019-11-06 21:22:17,206 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 21:22:17,206 INFO L462 AbstractCegarLoop]: Abstraction has 559 states and 649 transitions. [2019-11-06 21:22:17,206 INFO L463 AbstractCegarLoop]: Interpolant automaton has 33 states. [2019-11-06 21:22:17,207 INFO L276 IsEmpty]: Start isEmpty. Operand 559 states and 649 transitions. [2019-11-06 21:22:17,209 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2019-11-06 21:22:17,210 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 21:22:17,210 INFO L410 BasicCegarLoop]: trace histogram [18, 18, 16, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 21:22:17,413 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:22:17,414 INFO L410 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 21:22:17,414 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 21:22:17,414 INFO L82 PathProgramCache]: Analyzing trace with hash 1598348699, now seen corresponding path program 1 times [2019-11-06 21:22:17,414 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 21:22:17,414 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [388943169] [2019-11-06 21:22:17,414 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 21:22:17,428 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:22:17,814 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:22:17,816 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:22:17,825 INFO L134 CoverageAnalysis]: Checked inductivity of 502 backedges. 108 proven. 394 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:22:17,826 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [388943169] [2019-11-06 21:22:17,826 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [607009026] [2019-11-06 21:22:17,826 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:22:17,883 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:22:17,884 INFO L256 TraceCheckSpWp]: Trace formula consists of 149 conjuncts, 11 conjunts are in the unsatisfiable core [2019-11-06 21:22:17,885 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 21:22:18,080 INFO L134 CoverageAnalysis]: Checked inductivity of 502 backedges. 263 proven. 117 refuted. 0 times theorem prover too weak. 122 trivial. 0 not checked. [2019-11-06 21:22:18,081 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 21:22:18,081 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 12] total 37 [2019-11-06 21:22:18,081 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [283394173] [2019-11-06 21:22:18,094 INFO L442 AbstractCegarLoop]: Interpolant automaton has 37 states [2019-11-06 21:22:18,094 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 21:22:18,095 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2019-11-06 21:22:18,096 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=193, Invalid=1139, Unknown=0, NotChecked=0, Total=1332 [2019-11-06 21:22:18,096 INFO L87 Difference]: Start difference. First operand 559 states and 649 transitions. Second operand 37 states. [2019-11-06 21:22:18,924 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 21:22:18,925 INFO L93 Difference]: Finished difference Result 1098 states and 1270 transitions. [2019-11-06 21:22:18,925 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2019-11-06 21:22:18,925 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 77 [2019-11-06 21:22:18,925 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 21:22:18,929 INFO L225 Difference]: With dead ends: 1098 [2019-11-06 21:22:18,929 INFO L226 Difference]: Without dead ends: 645 [2019-11-06 21:22:18,931 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 138 GetRequests, 74 SyntacticMatches, 0 SemanticMatches, 64 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1171 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=912, Invalid=3378, Unknown=0, NotChecked=0, Total=4290 [2019-11-06 21:22:18,932 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 645 states. [2019-11-06 21:22:18,954 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 645 to 377. [2019-11-06 21:22:18,955 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 377 states. [2019-11-06 21:22:18,956 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 377 states to 377 states and 446 transitions. [2019-11-06 21:22:18,956 INFO L78 Accepts]: Start accepts. Automaton has 377 states and 446 transitions. Word has length 77 [2019-11-06 21:22:18,957 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 21:22:18,957 INFO L462 AbstractCegarLoop]: Abstraction has 377 states and 446 transitions. [2019-11-06 21:22:18,957 INFO L463 AbstractCegarLoop]: Interpolant automaton has 37 states. [2019-11-06 21:22:18,957 INFO L276 IsEmpty]: Start isEmpty. Operand 377 states and 446 transitions. [2019-11-06 21:22:18,958 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 84 [2019-11-06 21:22:18,958 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 21:22:18,958 INFO L410 BasicCegarLoop]: trace histogram [20, 20, 18, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 21:22:19,162 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:22:19,162 INFO L410 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 21:22:19,163 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 21:22:19,163 INFO L82 PathProgramCache]: Analyzing trace with hash 264763513, now seen corresponding path program 2 times [2019-11-06 21:22:19,163 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 21:22:19,164 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1036567958] [2019-11-06 21:22:19,164 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 21:22:19,175 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:22:19,523 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:22:19,524 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:22:19,537 INFO L134 CoverageAnalysis]: Checked inductivity of 617 backedges. 134 proven. 483 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:22:19,537 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1036567958] [2019-11-06 21:22:19,538 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1699931540] [2019-11-06 21:22:19,538 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:22:19,592 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-11-06 21:22:19,593 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 21:22:19,594 INFO L256 TraceCheckSpWp]: Trace formula consists of 157 conjuncts, 6 conjunts are in the unsatisfiable core [2019-11-06 21:22:19,597 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 21:22:19,645 INFO L134 CoverageAnalysis]: Checked inductivity of 617 backedges. 6 proven. 151 refuted. 0 times theorem prover too weak. 460 trivial. 0 not checked. [2019-11-06 21:22:19,646 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 21:22:19,646 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 7] total 34 [2019-11-06 21:22:19,646 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [271541292] [2019-11-06 21:22:19,647 INFO L442 AbstractCegarLoop]: Interpolant automaton has 34 states [2019-11-06 21:22:19,647 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 21:22:19,647 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2019-11-06 21:22:19,648 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=168, Invalid=954, Unknown=0, NotChecked=0, Total=1122 [2019-11-06 21:22:19,648 INFO L87 Difference]: Start difference. First operand 377 states and 446 transitions. Second operand 34 states. [2019-11-06 21:22:22,173 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 21:22:22,173 INFO L93 Difference]: Finished difference Result 1977 states and 2283 transitions. [2019-11-06 21:22:22,173 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 65 states. [2019-11-06 21:22:22,174 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 83 [2019-11-06 21:22:22,174 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 21:22:22,184 INFO L225 Difference]: With dead ends: 1977 [2019-11-06 21:22:22,185 INFO L226 Difference]: Without dead ends: 1798 [2019-11-06 21:22:22,189 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 175 GetRequests, 87 SyntacticMatches, 0 SemanticMatches, 88 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1982 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=1794, Invalid=6216, Unknown=0, NotChecked=0, Total=8010 [2019-11-06 21:22:22,191 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1798 states. [2019-11-06 21:22:22,264 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1798 to 674. [2019-11-06 21:22:22,264 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 674 states. [2019-11-06 21:22:22,266 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 674 states to 674 states and 787 transitions. [2019-11-06 21:22:22,267 INFO L78 Accepts]: Start accepts. Automaton has 674 states and 787 transitions. Word has length 83 [2019-11-06 21:22:22,267 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 21:22:22,267 INFO L462 AbstractCegarLoop]: Abstraction has 674 states and 787 transitions. [2019-11-06 21:22:22,267 INFO L463 AbstractCegarLoop]: Interpolant automaton has 34 states. [2019-11-06 21:22:22,267 INFO L276 IsEmpty]: Start isEmpty. Operand 674 states and 787 transitions. [2019-11-06 21:22:22,269 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 84 [2019-11-06 21:22:22,269 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 21:22:22,269 INFO L410 BasicCegarLoop]: trace histogram [20, 20, 18, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 21:22:22,472 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:22:22,473 INFO L410 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 21:22:22,473 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 21:22:22,474 INFO L82 PathProgramCache]: Analyzing trace with hash 504104765, now seen corresponding path program 3 times [2019-11-06 21:22:22,474 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 21:22:22,474 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1021389090] [2019-11-06 21:22:22,475 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 21:22:22,485 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:22:22,830 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:22:22,833 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:22:22,845 INFO L134 CoverageAnalysis]: Checked inductivity of 617 backedges. 134 proven. 483 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:22:22,846 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1021389090] [2019-11-06 21:22:22,846 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1132478994] [2019-11-06 21:22:22,846 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:22:22,903 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2019-11-06 21:22:22,903 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 21:22:22,904 INFO L256 TraceCheckSpWp]: Trace formula consists of 86 conjuncts, 22 conjunts are in the unsatisfiable core [2019-11-06 21:22:22,906 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 21:22:23,073 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-06 21:22:23,130 INFO L134 CoverageAnalysis]: Checked inductivity of 617 backedges. 30 proven. 325 refuted. 0 times theorem prover too weak. 262 trivial. 0 not checked. [2019-11-06 21:22:23,130 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 21:22:23,130 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 10] total 40 [2019-11-06 21:22:23,131 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1920823194] [2019-11-06 21:22:23,131 INFO L442 AbstractCegarLoop]: Interpolant automaton has 40 states [2019-11-06 21:22:23,131 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 21:22:23,131 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2019-11-06 21:22:23,132 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=170, Invalid=1390, Unknown=0, NotChecked=0, Total=1560 [2019-11-06 21:22:23,132 INFO L87 Difference]: Start difference. First operand 674 states and 787 transitions. Second operand 40 states. [2019-11-06 21:22:28,651 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 21:22:28,651 INFO L93 Difference]: Finished difference Result 2040 states and 2317 transitions. [2019-11-06 21:22:28,656 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 158 states. [2019-11-06 21:22:28,656 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 83 [2019-11-06 21:22:28,656 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 21:22:28,663 INFO L225 Difference]: With dead ends: 2040 [2019-11-06 21:22:28,664 INFO L226 Difference]: Without dead ends: 1706 [2019-11-06 21:22:28,671 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 256 GetRequests, 81 SyntacticMatches, 0 SemanticMatches, 175 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11510 ImplicationChecksByTransitivity, 3.9s TimeCoverageRelationStatistics Valid=4468, Invalid=26684, Unknown=0, NotChecked=0, Total=31152 [2019-11-06 21:22:28,672 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1706 states. [2019-11-06 21:22:28,753 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1706 to 908. [2019-11-06 21:22:28,753 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 908 states. [2019-11-06 21:22:28,756 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 908 states to 908 states and 1051 transitions. [2019-11-06 21:22:28,757 INFO L78 Accepts]: Start accepts. Automaton has 908 states and 1051 transitions. Word has length 83 [2019-11-06 21:22:28,757 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 21:22:28,757 INFO L462 AbstractCegarLoop]: Abstraction has 908 states and 1051 transitions. [2019-11-06 21:22:28,757 INFO L463 AbstractCegarLoop]: Interpolant automaton has 40 states. [2019-11-06 21:22:28,757 INFO L276 IsEmpty]: Start isEmpty. Operand 908 states and 1051 transitions. [2019-11-06 21:22:28,759 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 84 [2019-11-06 21:22:28,759 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 21:22:28,760 INFO L410 BasicCegarLoop]: trace histogram [20, 20, 18, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 21:22:28,963 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:22:28,963 INFO L410 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 21:22:28,963 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 21:22:28,964 INFO L82 PathProgramCache]: Analyzing trace with hash -1928827587, now seen corresponding path program 4 times [2019-11-06 21:22:28,964 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 21:22:28,964 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1294184303] [2019-11-06 21:22:28,964 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 21:22:28,975 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:22:29,212 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:22:29,214 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:22:29,234 INFO L134 CoverageAnalysis]: Checked inductivity of 617 backedges. 306 proven. 311 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:22:29,234 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1294184303] [2019-11-06 21:22:29,235 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1779837605] [2019-11-06 21:22:29,235 INFO L92 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:22:29,293 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-11-06 21:22:29,294 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 21:22:29,295 INFO L256 TraceCheckSpWp]: Trace formula consists of 115 conjuncts, 13 conjunts are in the unsatisfiable core [2019-11-06 21:22:29,296 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 21:22:29,506 INFO L134 CoverageAnalysis]: Checked inductivity of 617 backedges. 452 proven. 39 refuted. 0 times theorem prover too weak. 126 trivial. 0 not checked. [2019-11-06 21:22:29,506 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 21:22:29,506 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 14] total 41 [2019-11-06 21:22:29,506 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1296165084] [2019-11-06 21:22:29,507 INFO L442 AbstractCegarLoop]: Interpolant automaton has 41 states [2019-11-06 21:22:29,507 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 21:22:29,507 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2019-11-06 21:22:29,507 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=336, Invalid=1304, Unknown=0, NotChecked=0, Total=1640 [2019-11-06 21:22:29,507 INFO L87 Difference]: Start difference. First operand 908 states and 1051 transitions. Second operand 41 states. [2019-11-06 21:22:31,714 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 21:22:31,714 INFO L93 Difference]: Finished difference Result 2053 states and 2376 transitions. [2019-11-06 21:22:31,717 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2019-11-06 21:22:31,717 INFO L78 Accepts]: Start accepts. Automaton has 41 states. Word has length 83 [2019-11-06 21:22:31,718 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 21:22:31,724 INFO L225 Difference]: With dead ends: 2053 [2019-11-06 21:22:31,724 INFO L226 Difference]: Without dead ends: 1527 [2019-11-06 21:22:31,726 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 161 GetRequests, 78 SyntacticMatches, 0 SemanticMatches, 83 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2242 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=969, Invalid=6171, Unknown=0, NotChecked=0, Total=7140 [2019-11-06 21:22:31,728 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1527 states. [2019-11-06 21:22:31,826 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1527 to 1247. [2019-11-06 21:22:31,826 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1247 states. [2019-11-06 21:22:31,830 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1247 states to 1247 states and 1434 transitions. [2019-11-06 21:22:31,830 INFO L78 Accepts]: Start accepts. Automaton has 1247 states and 1434 transitions. Word has length 83 [2019-11-06 21:22:31,830 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 21:22:31,830 INFO L462 AbstractCegarLoop]: Abstraction has 1247 states and 1434 transitions. [2019-11-06 21:22:31,831 INFO L463 AbstractCegarLoop]: Interpolant automaton has 41 states. [2019-11-06 21:22:31,831 INFO L276 IsEmpty]: Start isEmpty. Operand 1247 states and 1434 transitions. [2019-11-06 21:22:31,833 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2019-11-06 21:22:31,833 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 21:22:31,833 INFO L410 BasicCegarLoop]: trace histogram [21, 21, 20, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 21:22:32,036 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:22:32,037 INFO L410 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 21:22:32,037 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 21:22:32,037 INFO L82 PathProgramCache]: Analyzing trace with hash -1853082235, now seen corresponding path program 5 times [2019-11-06 21:22:32,037 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 21:22:32,037 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [321787550] [2019-11-06 21:22:32,037 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 21:22:32,047 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:22:32,257 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:22:32,259 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:22:32,276 INFO L134 CoverageAnalysis]: Checked inductivity of 679 backedges. 355 proven. 323 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-11-06 21:22:32,276 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [321787550] [2019-11-06 21:22:32,277 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [290869918] [2019-11-06 21:22:32,277 INFO L92 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:22:32,387 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 12 check-sat command(s) [2019-11-06 21:22:32,387 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 21:22:32,388 INFO L256 TraceCheckSpWp]: Trace formula consists of 112 conjuncts, 13 conjunts are in the unsatisfiable core [2019-11-06 21:22:32,391 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 21:22:32,409 INFO L134 CoverageAnalysis]: Checked inductivity of 679 backedges. 353 proven. 176 refuted. 0 times theorem prover too weak. 150 trivial. 0 not checked. [2019-11-06 21:22:32,410 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 21:22:32,410 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 14] total 28 [2019-11-06 21:22:32,410 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1735048034] [2019-11-06 21:22:32,412 INFO L442 AbstractCegarLoop]: Interpolant automaton has 28 states [2019-11-06 21:22:32,413 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 21:22:32,413 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2019-11-06 21:22:32,414 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=284, Invalid=472, Unknown=0, NotChecked=0, Total=756 [2019-11-06 21:22:32,415 INFO L87 Difference]: Start difference. First operand 1247 states and 1434 transitions. Second operand 28 states. [2019-11-06 21:22:32,800 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 21:22:32,800 INFO L93 Difference]: Finished difference Result 2328 states and 2723 transitions. [2019-11-06 21:22:32,801 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2019-11-06 21:22:32,801 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 86 [2019-11-06 21:22:32,801 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 21:22:32,807 INFO L225 Difference]: With dead ends: 2328 [2019-11-06 21:22:32,807 INFO L226 Difference]: Without dead ends: 1196 [2019-11-06 21:22:32,815 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 118 GetRequests, 91 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 350 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=288, Invalid=524, Unknown=0, NotChecked=0, Total=812 [2019-11-06 21:22:32,817 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1196 states. [2019-11-06 21:22:32,886 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1196 to 987. [2019-11-06 21:22:32,886 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 987 states. [2019-11-06 21:22:32,889 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 987 states to 987 states and 1131 transitions. [2019-11-06 21:22:32,890 INFO L78 Accepts]: Start accepts. Automaton has 987 states and 1131 transitions. Word has length 86 [2019-11-06 21:22:32,890 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 21:22:32,890 INFO L462 AbstractCegarLoop]: Abstraction has 987 states and 1131 transitions. [2019-11-06 21:22:32,890 INFO L463 AbstractCegarLoop]: Interpolant automaton has 28 states. [2019-11-06 21:22:32,890 INFO L276 IsEmpty]: Start isEmpty. Operand 987 states and 1131 transitions. [2019-11-06 21:22:32,892 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 96 [2019-11-06 21:22:32,892 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 21:22:32,893 INFO L410 BasicCegarLoop]: trace histogram [24, 24, 22, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 21:22:33,096 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:22:33,097 INFO L410 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 21:22:33,097 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 21:22:33,097 INFO L82 PathProgramCache]: Analyzing trace with hash 1132135865, now seen corresponding path program 6 times [2019-11-06 21:22:33,098 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 21:22:33,098 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [997947453] [2019-11-06 21:22:33,098 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 21:22:33,111 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:22:33,414 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:22:33,417 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:22:33,425 INFO L134 CoverageAnalysis]: Checked inductivity of 883 backedges. 438 proven. 445 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:22:33,426 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [997947453] [2019-11-06 21:22:33,426 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [116957979] [2019-11-06 21:22:33,426 INFO L92 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:22:33,490 INFO L249 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 5 check-sat command(s) [2019-11-06 21:22:33,490 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 21:22:33,491 INFO L256 TraceCheckSpWp]: Trace formula consists of 98 conjuncts, 21 conjunts are in the unsatisfiable core [2019-11-06 21:22:33,492 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 21:22:33,630 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-06 21:22:33,674 INFO L134 CoverageAnalysis]: Checked inductivity of 883 backedges. 36 proven. 461 refuted. 0 times theorem prover too weak. 386 trivial. 0 not checked. [2019-11-06 21:22:33,674 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 21:22:33,674 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 10] total 41 [2019-11-06 21:22:33,675 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1823082208] [2019-11-06 21:22:33,675 INFO L442 AbstractCegarLoop]: Interpolant automaton has 41 states [2019-11-06 21:22:33,675 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 21:22:33,675 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2019-11-06 21:22:33,676 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=365, Invalid=1275, Unknown=0, NotChecked=0, Total=1640 [2019-11-06 21:22:33,676 INFO L87 Difference]: Start difference. First operand 987 states and 1131 transitions. Second operand 41 states. [2019-11-06 21:22:35,922 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 21:22:35,922 INFO L93 Difference]: Finished difference Result 1398 states and 1585 transitions. [2019-11-06 21:22:35,923 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 105 states. [2019-11-06 21:22:35,923 INFO L78 Accepts]: Start accepts. Automaton has 41 states. Word has length 95 [2019-11-06 21:22:35,923 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 21:22:35,929 INFO L225 Difference]: With dead ends: 1398 [2019-11-06 21:22:35,929 INFO L226 Difference]: Without dead ends: 1328 [2019-11-06 21:22:35,931 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 214 GetRequests, 93 SyntacticMatches, 0 SemanticMatches, 121 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5700 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=2125, Invalid=12881, Unknown=0, NotChecked=0, Total=15006 [2019-11-06 21:22:35,932 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1328 states. [2019-11-06 21:22:35,999 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1328 to 1033. [2019-11-06 21:22:35,999 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1033 states. [2019-11-06 21:22:36,002 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1033 states to 1033 states and 1185 transitions. [2019-11-06 21:22:36,002 INFO L78 Accepts]: Start accepts. Automaton has 1033 states and 1185 transitions. Word has length 95 [2019-11-06 21:22:36,003 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 21:22:36,003 INFO L462 AbstractCegarLoop]: Abstraction has 1033 states and 1185 transitions. [2019-11-06 21:22:36,003 INFO L463 AbstractCegarLoop]: Interpolant automaton has 41 states. [2019-11-06 21:22:36,003 INFO L276 IsEmpty]: Start isEmpty. Operand 1033 states and 1185 transitions. [2019-11-06 21:22:36,006 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 141 [2019-11-06 21:22:36,006 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 21:22:36,006 INFO L410 BasicCegarLoop]: trace histogram [36, 36, 33, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 21:22:36,209 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:22:36,210 INFO L410 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 21:22:36,210 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 21:22:36,210 INFO L82 PathProgramCache]: Analyzing trace with hash 504488552, now seen corresponding path program 4 times [2019-11-06 21:22:36,210 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 21:22:36,211 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [712535556] [2019-11-06 21:22:36,211 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 21:22:36,227 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:22:36,856 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:22:36,858 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:22:36,860 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:22:36,891 INFO L134 CoverageAnalysis]: Checked inductivity of 2021 backedges. 41 proven. 1976 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2019-11-06 21:22:36,891 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [712535556] [2019-11-06 21:22:36,892 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [588285521] [2019-11-06 21:22:36,892 INFO L92 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:22:36,997 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-11-06 21:22:36,998 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 21:22:36,999 INFO L256 TraceCheckSpWp]: Trace formula consists of 241 conjuncts, 14 conjunts are in the unsatisfiable core [2019-11-06 21:22:37,001 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 21:22:37,270 INFO L134 CoverageAnalysis]: Checked inductivity of 2021 backedges. 916 proven. 210 refuted. 0 times theorem prover too weak. 895 trivial. 0 not checked. [2019-11-06 21:22:37,271 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 21:22:37,271 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [45, 15] total 57 [2019-11-06 21:22:37,271 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [582164752] [2019-11-06 21:22:37,271 INFO L442 AbstractCegarLoop]: Interpolant automaton has 57 states [2019-11-06 21:22:37,272 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 21:22:37,272 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 57 interpolants. [2019-11-06 21:22:37,272 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=593, Invalid=2599, Unknown=0, NotChecked=0, Total=3192 [2019-11-06 21:22:37,272 INFO L87 Difference]: Start difference. First operand 1033 states and 1185 transitions. Second operand 57 states. [2019-11-06 21:22:38,717 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 21:22:38,717 INFO L93 Difference]: Finished difference Result 2373 states and 2707 transitions. [2019-11-06 21:22:38,717 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 51 states. [2019-11-06 21:22:38,717 INFO L78 Accepts]: Start accepts. Automaton has 57 states. Word has length 140 [2019-11-06 21:22:38,718 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 21:22:38,724 INFO L225 Difference]: With dead ends: 2373 [2019-11-06 21:22:38,724 INFO L226 Difference]: Without dead ends: 1500 [2019-11-06 21:22:38,726 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 224 GetRequests, 134 SyntacticMatches, 0 SemanticMatches, 90 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2251 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=1618, Invalid=6754, Unknown=0, NotChecked=0, Total=8372 [2019-11-06 21:22:38,728 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1500 states. [2019-11-06 21:22:38,811 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1500 to 1042. [2019-11-06 21:22:38,811 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1042 states. [2019-11-06 21:22:38,814 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1042 states to 1042 states and 1193 transitions. [2019-11-06 21:22:38,814 INFO L78 Accepts]: Start accepts. Automaton has 1042 states and 1193 transitions. Word has length 140 [2019-11-06 21:22:38,815 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 21:22:38,815 INFO L462 AbstractCegarLoop]: Abstraction has 1042 states and 1193 transitions. [2019-11-06 21:22:38,815 INFO L463 AbstractCegarLoop]: Interpolant automaton has 57 states. [2019-11-06 21:22:38,815 INFO L276 IsEmpty]: Start isEmpty. Operand 1042 states and 1193 transitions. [2019-11-06 21:22:38,818 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 150 [2019-11-06 21:22:38,818 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 21:22:38,818 INFO L410 BasicCegarLoop]: trace histogram [39, 39, 36, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 21:22:39,022 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:22:39,022 INFO L410 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 21:22:39,023 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 21:22:39,023 INFO L82 PathProgramCache]: Analyzing trace with hash -1059604552, now seen corresponding path program 5 times [2019-11-06 21:22:39,023 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 21:22:39,023 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1451795294] [2019-11-06 21:22:39,024 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 21:22:39,041 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:22:39,924 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:22:39,926 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:22:39,928 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:22:39,962 INFO L134 CoverageAnalysis]: Checked inductivity of 2363 backedges. 43 proven. 2316 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2019-11-06 21:22:39,963 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1451795294] [2019-11-06 21:22:39,963 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [249341539] [2019-11-06 21:22:39,963 INFO L92 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:22:40,071 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 25 check-sat command(s) [2019-11-06 21:22:40,071 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 21:22:40,072 INFO L256 TraceCheckSpWp]: Trace formula consists of 172 conjuncts, 17 conjunts are in the unsatisfiable core [2019-11-06 21:22:40,074 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 21:22:40,478 INFO L134 CoverageAnalysis]: Checked inductivity of 2363 backedges. 1160 proven. 222 refuted. 0 times theorem prover too weak. 981 trivial. 0 not checked. [2019-11-06 21:22:40,479 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 21:22:40,479 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [48, 18] total 64 [2019-11-06 21:22:40,479 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2024749614] [2019-11-06 21:22:40,479 INFO L442 AbstractCegarLoop]: Interpolant automaton has 64 states [2019-11-06 21:22:40,479 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 21:22:40,480 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 64 interpolants. [2019-11-06 21:22:40,480 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=520, Invalid=3512, Unknown=0, NotChecked=0, Total=4032 [2019-11-06 21:22:40,480 INFO L87 Difference]: Start difference. First operand 1042 states and 1193 transitions. Second operand 64 states.