/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample FPandBPonlyIfFpWasNotPerfect -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.assert.codeblocks SMT_FEATURE_HEURISTIC --traceabstraction.assert.codeblocks.term.scoring.heuristic NUM_VARIABLES --traceabstraction.assert.codeblocks.term.scoring.heuristic.partitioning.strategy FIXED_NUM_PARTITIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.number.of.partitions 2 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loop-invgen/nested9.i -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-21 16:56:35,851 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-21 16:56:35,854 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-21 16:56:35,866 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-21 16:56:35,867 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-21 16:56:35,868 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-21 16:56:35,869 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-21 16:56:35,871 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-21 16:56:35,873 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-21 16:56:35,874 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-21 16:56:35,876 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-21 16:56:35,877 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-21 16:56:35,877 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-21 16:56:35,878 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-21 16:56:35,880 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-21 16:56:35,881 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-21 16:56:35,882 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-21 16:56:35,883 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-21 16:56:35,885 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-21 16:56:35,887 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-21 16:56:35,889 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-21 16:56:35,891 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-21 16:56:35,892 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-21 16:56:35,893 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-21 16:56:35,896 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-07-21 16:56:35,897 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-07-21 16:56:35,897 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-07-21 16:56:35,898 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-07-21 16:56:35,899 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-07-21 16:56:35,900 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-07-21 16:56:35,900 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-07-21 16:56:35,901 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-07-21 16:56:35,902 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-07-21 16:56:35,903 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-07-21 16:56:35,904 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-07-21 16:56:35,904 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-07-21 16:56:35,905 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-07-21 16:56:35,905 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-07-21 16:56:35,906 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-21 16:56:35,907 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-21 16:56:35,907 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-21 16:56:35,908 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-07-21 16:56:35,924 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-21 16:56:35,925 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-21 16:56:35,926 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-21 16:56:35,926 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-21 16:56:35,926 INFO L138 SettingsManager]: * Use SBE=true [2020-07-21 16:56:35,926 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-21 16:56:35,927 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-21 16:56:35,927 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-21 16:56:35,927 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-21 16:56:35,927 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-21 16:56:35,927 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-21 16:56:35,928 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-21 16:56:35,928 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-21 16:56:35,928 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-21 16:56:35,928 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-21 16:56:35,928 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-21 16:56:35,929 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-21 16:56:35,929 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-21 16:56:35,929 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-21 16:56:35,929 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-21 16:56:35,929 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-21 16:56:35,930 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 16:56:35,930 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-21 16:56:35,930 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-21 16:56:35,930 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-21 16:56:35,931 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-21 16:56:35,931 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:56:35,931 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-21 16:56:35,931 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-21 16:56:35,931 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> FPandBPonlyIfFpWasNotPerfect Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks -> SMT_FEATURE_HEURISTIC Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic -> NUM_VARIABLES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic Partitioning Strategy -> FIXED_NUM_PARTITIONS Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic number of partitions -> 2 [2020-07-21 16:56:36,240 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-21 16:56:36,254 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-21 16:56:36,258 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-21 16:56:36,260 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-21 16:56:36,260 INFO L275 PluginConnector]: CDTParser initialized [2020-07-21 16:56:36,261 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-invgen/nested9.i [2020-07-21 16:56:36,331 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/8a7088fc3/0164e25c54814642a76f37f38e142878/FLAGb5d922470 [2020-07-21 16:56:36,784 INFO L306 CDTParser]: Found 1 translation units. [2020-07-21 16:56:36,785 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-invgen/nested9.i [2020-07-21 16:56:36,792 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/8a7088fc3/0164e25c54814642a76f37f38e142878/FLAGb5d922470 [2020-07-21 16:56:37,219 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/8a7088fc3/0164e25c54814642a76f37f38e142878 [2020-07-21 16:56:37,229 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-21 16:56:37,232 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-21 16:56:37,233 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-21 16:56:37,233 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-21 16:56:37,239 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-21 16:56:37,241 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 04:56:37" (1/1) ... [2020-07-21 16:56:37,243 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@1de94141 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:56:37, skipping insertion in model container [2020-07-21 16:56:37,244 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 04:56:37" (1/1) ... [2020-07-21 16:56:37,252 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-21 16:56:37,270 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-21 16:56:37,436 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 16:56:37,441 INFO L203 MainTranslator]: Completed pre-run [2020-07-21 16:56:37,461 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 16:56:37,477 INFO L208 MainTranslator]: Completed translation [2020-07-21 16:56:37,477 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:56:37 WrapperNode [2020-07-21 16:56:37,478 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-21 16:56:37,478 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-21 16:56:37,479 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-21 16:56:37,479 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-21 16:56:37,493 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:56:37" (1/1) ... [2020-07-21 16:56:37,493 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:56:37" (1/1) ... [2020-07-21 16:56:37,499 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:56:37" (1/1) ... [2020-07-21 16:56:37,500 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:56:37" (1/1) ... [2020-07-21 16:56:37,505 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:56:37" (1/1) ... [2020-07-21 16:56:37,511 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:56:37" (1/1) ... [2020-07-21 16:56:37,513 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:56:37" (1/1) ... [2020-07-21 16:56:37,515 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-21 16:56:37,516 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-21 16:56:37,516 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-21 16:56:37,516 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-21 16:56:37,517 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:56:37" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 16:56:37,663 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-21 16:56:37,664 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-21 16:56:37,664 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2020-07-21 16:56:37,664 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-07-21 16:56:37,664 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-21 16:56:37,664 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-21 16:56:37,665 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-07-21 16:56:37,665 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2020-07-21 16:56:37,665 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-07-21 16:56:37,665 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-21 16:56:37,665 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-21 16:56:37,665 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-21 16:56:37,665 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-21 16:56:37,992 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-21 16:56:37,993 INFO L295 CfgBuilder]: Removed 3 assume(true) statements. [2020-07-21 16:56:37,998 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 04:56:37 BoogieIcfgContainer [2020-07-21 16:56:37,998 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-21 16:56:38,000 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-21 16:56:38,000 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-21 16:56:38,003 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-21 16:56:38,003 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.07 04:56:37" (1/3) ... [2020-07-21 16:56:38,004 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1438b5fc and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 04:56:38, skipping insertion in model container [2020-07-21 16:56:38,004 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:56:37" (2/3) ... [2020-07-21 16:56:38,005 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1438b5fc and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 04:56:38, skipping insertion in model container [2020-07-21 16:56:38,005 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 04:56:37" (3/3) ... [2020-07-21 16:56:38,007 INFO L109 eAbstractionObserver]: Analyzing ICFG nested9.i [2020-07-21 16:56:38,017 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-21 16:56:38,023 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-21 16:56:38,034 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-21 16:56:38,055 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-21 16:56:38,055 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-21 16:56:38,056 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-21 16:56:38,056 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-21 16:56:38,056 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-21 16:56:38,056 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-21 16:56:38,056 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-21 16:56:38,056 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-21 16:56:38,078 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states. [2020-07-21 16:56:38,084 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2020-07-21 16:56:38,085 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:56:38,086 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:56:38,086 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:56:38,091 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:56:38,092 INFO L82 PathProgramCache]: Analyzing trace with hash 1671060194, now seen corresponding path program 1 times [2020-07-21 16:56:38,099 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:56:38,099 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [458628100] [2020-07-21 16:56:38,100 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:56:38,204 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:56:38,205 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:56:38,208 INFO L263 TraceCheckSpWp]: Trace formula consists of 51 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 16:56:38,215 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:56:38,282 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 16:56:38,283 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 16:56:38,284 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [458628100] [2020-07-21 16:56:38,285 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 16:56:38,285 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-07-21 16:56:38,286 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [457572800] [2020-07-21 16:56:38,290 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-07-21 16:56:38,290 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:56:38,300 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-07-21 16:56:38,301 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2020-07-21 16:56:38,303 INFO L87 Difference]: Start difference. First operand 29 states. Second operand 4 states. [2020-07-21 16:56:38,393 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:56:38,393 INFO L93 Difference]: Finished difference Result 53 states and 74 transitions. [2020-07-21 16:56:38,394 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-07-21 16:56:38,395 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 18 [2020-07-21 16:56:38,396 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:56:38,409 INFO L225 Difference]: With dead ends: 53 [2020-07-21 16:56:38,410 INFO L226 Difference]: Without dead ends: 27 [2020-07-21 16:56:38,416 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 15 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2020-07-21 16:56:38,437 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2020-07-21 16:56:38,466 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 26. [2020-07-21 16:56:38,468 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-07-21 16:56:38,472 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 28 transitions. [2020-07-21 16:56:38,474 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 28 transitions. Word has length 18 [2020-07-21 16:56:38,474 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:56:38,474 INFO L479 AbstractCegarLoop]: Abstraction has 26 states and 28 transitions. [2020-07-21 16:56:38,475 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-07-21 16:56:38,475 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 28 transitions. [2020-07-21 16:56:38,477 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-07-21 16:56:38,477 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:56:38,478 INFO L422 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:56:38,686 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:56:38,686 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:56:38,687 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:56:38,688 INFO L82 PathProgramCache]: Analyzing trace with hash 514965223, now seen corresponding path program 1 times [2020-07-21 16:56:38,688 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:56:38,689 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [357957482] [2020-07-21 16:56:38,690 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:56:38,742 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:56:38,742 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:56:38,743 INFO L263 TraceCheckSpWp]: Trace formula consists of 57 conjuncts, 7 conjunts are in the unsatisfiable core [2020-07-21 16:56:38,746 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:56:38,795 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 16:56:38,801 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 16:56:38,846 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-21 16:56:38,846 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 16:56:38,847 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [357957482] [2020-07-21 16:56:38,847 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 16:56:38,847 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2020-07-21 16:56:38,847 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [206206777] [2020-07-21 16:56:38,849 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-07-21 16:56:38,850 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:56:38,850 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-07-21 16:56:38,850 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2020-07-21 16:56:38,851 INFO L87 Difference]: Start difference. First operand 26 states and 28 transitions. Second operand 6 states. [2020-07-21 16:56:38,968 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:56:38,968 INFO L93 Difference]: Finished difference Result 46 states and 52 transitions. [2020-07-21 16:56:38,969 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-21 16:56:38,969 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 21 [2020-07-21 16:56:38,969 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:56:38,970 INFO L225 Difference]: With dead ends: 46 [2020-07-21 16:56:38,970 INFO L226 Difference]: Without dead ends: 33 [2020-07-21 16:56:38,972 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 16 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2020-07-21 16:56:38,973 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2020-07-21 16:56:38,979 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 32. [2020-07-21 16:56:38,980 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2020-07-21 16:56:38,981 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 34 transitions. [2020-07-21 16:56:38,981 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 34 transitions. Word has length 21 [2020-07-21 16:56:38,982 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:56:38,982 INFO L479 AbstractCegarLoop]: Abstraction has 32 states and 34 transitions. [2020-07-21 16:56:38,982 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-07-21 16:56:38,982 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 34 transitions. [2020-07-21 16:56:38,983 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-07-21 16:56:38,983 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:56:38,984 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:56:39,197 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:56:39,197 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:56:39,198 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:56:39,198 INFO L82 PathProgramCache]: Analyzing trace with hash -1134636734, now seen corresponding path program 1 times [2020-07-21 16:56:39,199 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:56:39,200 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [289920199] [2020-07-21 16:56:39,200 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:56:39,233 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 16:56:39,233 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:56:39,234 INFO L263 TraceCheckSpWp]: Trace formula consists of 43 conjuncts, 7 conjunts are in the unsatisfiable core [2020-07-21 16:56:39,237 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:56:39,337 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 16:56:39,338 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 16:56:39,338 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [289920199] [2020-07-21 16:56:39,339 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 16:56:39,339 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2020-07-21 16:56:39,339 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2136853493] [2020-07-21 16:56:39,340 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-07-21 16:56:39,340 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:56:39,341 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-07-21 16:56:39,341 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2020-07-21 16:56:39,341 INFO L87 Difference]: Start difference. First operand 32 states and 34 transitions. Second operand 8 states. [2020-07-21 16:56:39,594 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:56:39,595 INFO L93 Difference]: Finished difference Result 68 states and 80 transitions. [2020-07-21 16:56:39,596 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-21 16:56:39,596 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 28 [2020-07-21 16:56:39,597 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:56:39,605 INFO L225 Difference]: With dead ends: 68 [2020-07-21 16:56:39,606 INFO L226 Difference]: Without dead ends: 49 [2020-07-21 16:56:39,610 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=37, Invalid=73, Unknown=0, NotChecked=0, Total=110 [2020-07-21 16:56:39,611 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2020-07-21 16:56:39,648 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 42. [2020-07-21 16:56:39,648 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2020-07-21 16:56:39,651 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 48 transitions. [2020-07-21 16:56:39,652 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 48 transitions. Word has length 28 [2020-07-21 16:56:39,652 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:56:39,652 INFO L479 AbstractCegarLoop]: Abstraction has 42 states and 48 transitions. [2020-07-21 16:56:39,652 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-07-21 16:56:39,653 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 48 transitions. [2020-07-21 16:56:39,658 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-07-21 16:56:39,659 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:56:39,659 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:56:39,860 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:56:39,863 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:56:39,863 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:56:39,864 INFO L82 PathProgramCache]: Analyzing trace with hash -670641491, now seen corresponding path program 1 times [2020-07-21 16:56:39,864 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:56:39,865 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1285069507] [2020-07-21 16:56:39,865 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:56:39,902 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:56:39,902 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:56:39,903 INFO L263 TraceCheckSpWp]: Trace formula consists of 93 conjuncts, 9 conjunts are in the unsatisfiable core [2020-07-21 16:56:39,906 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:56:39,982 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 16:56:39,987 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 16:56:40,023 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 18 proven. 4 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2020-07-21 16:56:40,024 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:56:40,044 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:56:40,147 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 11 proven. 11 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2020-07-21 16:56:40,148 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1285069507] [2020-07-21 16:56:40,148 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:56:40,148 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10] total 16 [2020-07-21 16:56:40,148 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1504916981] [2020-07-21 16:56:40,149 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-07-21 16:56:40,149 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:56:40,149 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-07-21 16:56:40,150 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=66, Invalid=174, Unknown=0, NotChecked=0, Total=240 [2020-07-21 16:56:40,150 INFO L87 Difference]: Start difference. First operand 42 states and 48 transitions. Second operand 16 states. [2020-07-21 16:56:40,611 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:56:40,611 INFO L93 Difference]: Finished difference Result 105 states and 129 transitions. [2020-07-21 16:56:40,612 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-07-21 16:56:40,612 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 41 [2020-07-21 16:56:40,612 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:56:40,614 INFO L225 Difference]: With dead ends: 105 [2020-07-21 16:56:40,615 INFO L226 Difference]: Without dead ends: 65 [2020-07-21 16:56:40,616 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 98 GetRequests, 69 SyntacticMatches, 2 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 135 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=249, Invalid=563, Unknown=0, NotChecked=0, Total=812 [2020-07-21 16:56:40,617 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2020-07-21 16:56:40,629 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 55. [2020-07-21 16:56:40,629 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2020-07-21 16:56:40,631 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 63 transitions. [2020-07-21 16:56:40,631 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 63 transitions. Word has length 41 [2020-07-21 16:56:40,632 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:56:40,632 INFO L479 AbstractCegarLoop]: Abstraction has 55 states and 63 transitions. [2020-07-21 16:56:40,632 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-07-21 16:56:40,632 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 63 transitions. [2020-07-21 16:56:40,634 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2020-07-21 16:56:40,634 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:56:40,635 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 6, 5, 5, 5, 5, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:56:40,849 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:56:40,850 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:56:40,850 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:56:40,851 INFO L82 PathProgramCache]: Analyzing trace with hash 1941695900, now seen corresponding path program 2 times [2020-07-21 16:56:40,851 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:56:40,852 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1301938285] [2020-07-21 16:56:40,853 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:56:40,898 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 16:56:40,899 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:56:40,900 INFO L263 TraceCheckSpWp]: Trace formula consists of 83 conjuncts, 9 conjunts are in the unsatisfiable core [2020-07-21 16:56:40,904 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:56:41,052 INFO L134 CoverageAnalysis]: Checked inductivity of 106 backedges. 63 proven. 16 refuted. 0 times theorem prover too weak. 27 trivial. 0 not checked. [2020-07-21 16:56:41,052 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:56:41,207 INFO L134 CoverageAnalysis]: Checked inductivity of 106 backedges. 42 proven. 17 refuted. 0 times theorem prover too weak. 47 trivial. 0 not checked. [2020-07-21 16:56:41,208 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1301938285] [2020-07-21 16:56:41,208 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:56:41,209 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10] total 15 [2020-07-21 16:56:41,209 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [999038314] [2020-07-21 16:56:41,210 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-21 16:56:41,210 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:56:41,211 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-21 16:56:41,211 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=162, Unknown=0, NotChecked=0, Total=210 [2020-07-21 16:56:41,213 INFO L87 Difference]: Start difference. First operand 55 states and 63 transitions. Second operand 15 states. [2020-07-21 16:56:41,789 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:56:41,789 INFO L93 Difference]: Finished difference Result 131 states and 165 transitions. [2020-07-21 16:56:41,790 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-07-21 16:56:41,790 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 62 [2020-07-21 16:56:41,791 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:56:41,792 INFO L225 Difference]: With dead ends: 131 [2020-07-21 16:56:41,792 INFO L226 Difference]: Without dead ends: 98 [2020-07-21 16:56:41,795 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 137 GetRequests, 107 SyntacticMatches, 3 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 171 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=209, Invalid=603, Unknown=0, NotChecked=0, Total=812 [2020-07-21 16:56:41,796 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 98 states. [2020-07-21 16:56:41,823 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 98 to 65. [2020-07-21 16:56:41,823 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 65 states. [2020-07-21 16:56:41,829 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 75 transitions. [2020-07-21 16:56:41,829 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 75 transitions. Word has length 62 [2020-07-21 16:56:41,832 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:56:41,832 INFO L479 AbstractCegarLoop]: Abstraction has 65 states and 75 transitions. [2020-07-21 16:56:41,833 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-21 16:56:41,833 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 75 transitions. [2020-07-21 16:56:41,835 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2020-07-21 16:56:41,835 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:56:41,836 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 8, 7, 7, 7, 7, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:56:42,038 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:56:42,039 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:56:42,040 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:56:42,040 INFO L82 PathProgramCache]: Analyzing trace with hash 1833574291, now seen corresponding path program 3 times [2020-07-21 16:56:42,040 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:56:42,041 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1908208345] [2020-07-21 16:56:42,041 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:56:42,105 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:56:42,106 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:56:42,107 INFO L263 TraceCheckSpWp]: Trace formula consists of 159 conjuncts, 11 conjunts are in the unsatisfiable core [2020-07-21 16:56:42,122 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:56:42,265 INFO L134 CoverageAnalysis]: Checked inductivity of 207 backedges. 78 proven. 59 refuted. 0 times theorem prover too weak. 70 trivial. 0 not checked. [2020-07-21 16:56:42,265 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:56:42,450 INFO L134 CoverageAnalysis]: Checked inductivity of 207 backedges. 55 proven. 60 refuted. 0 times theorem prover too weak. 92 trivial. 0 not checked. [2020-07-21 16:56:42,458 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1908208345] [2020-07-21 16:56:42,458 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:56:42,459 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12] total 19 [2020-07-21 16:56:42,459 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [890944525] [2020-07-21 16:56:42,460 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-07-21 16:56:42,460 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:56:42,461 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-07-21 16:56:42,461 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=71, Invalid=271, Unknown=0, NotChecked=0, Total=342 [2020-07-21 16:56:42,461 INFO L87 Difference]: Start difference. First operand 65 states and 75 transitions. Second operand 19 states. [2020-07-21 16:56:43,330 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:56:43,330 INFO L93 Difference]: Finished difference Result 139 states and 173 transitions. [2020-07-21 16:56:43,331 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2020-07-21 16:56:43,331 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 79 [2020-07-21 16:56:43,331 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:56:43,333 INFO L225 Difference]: With dead ends: 139 [2020-07-21 16:56:43,333 INFO L226 Difference]: Without dead ends: 106 [2020-07-21 16:56:43,335 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 176 GetRequests, 137 SyntacticMatches, 3 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 318 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=353, Invalid=1053, Unknown=0, NotChecked=0, Total=1406 [2020-07-21 16:56:43,335 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 106 states. [2020-07-21 16:56:43,349 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 106 to 79. [2020-07-21 16:56:43,350 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 79 states. [2020-07-21 16:56:43,351 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 95 transitions. [2020-07-21 16:56:43,351 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 95 transitions. Word has length 79 [2020-07-21 16:56:43,352 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:56:43,352 INFO L479 AbstractCegarLoop]: Abstraction has 79 states and 95 transitions. [2020-07-21 16:56:43,352 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-07-21 16:56:43,352 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 95 transitions. [2020-07-21 16:56:43,354 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 100 [2020-07-21 16:56:43,354 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:56:43,354 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 10, 9, 9, 9, 9, 4, 4, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:56:43,559 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:56:43,560 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:56:43,561 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:56:43,561 INFO L82 PathProgramCache]: Analyzing trace with hash -832577267, now seen corresponding path program 4 times [2020-07-21 16:56:43,561 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:56:43,562 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [982501236] [2020-07-21 16:56:43,562 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:56:43,601 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 16:56:43,601 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:56:43,602 INFO L263 TraceCheckSpWp]: Trace formula consists of 127 conjuncts, 9 conjunts are in the unsatisfiable core [2020-07-21 16:56:43,606 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:56:43,732 INFO L134 CoverageAnalysis]: Checked inductivity of 354 backedges. 215 proven. 33 refuted. 0 times theorem prover too weak. 106 trivial. 0 not checked. [2020-07-21 16:56:43,732 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:56:43,894 INFO L134 CoverageAnalysis]: Checked inductivity of 354 backedges. 131 proven. 45 refuted. 0 times theorem prover too weak. 178 trivial. 0 not checked. [2020-07-21 16:56:43,895 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [982501236] [2020-07-21 16:56:43,895 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:56:43,895 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10] total 16 [2020-07-21 16:56:43,895 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1434540536] [2020-07-21 16:56:43,896 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-07-21 16:56:43,896 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:56:43,896 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-07-21 16:56:43,896 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=63, Invalid=177, Unknown=0, NotChecked=0, Total=240 [2020-07-21 16:56:43,897 INFO L87 Difference]: Start difference. First operand 79 states and 95 transitions. Second operand 16 states. [2020-07-21 16:56:44,268 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:56:44,269 INFO L93 Difference]: Finished difference Result 163 states and 204 transitions. [2020-07-21 16:56:44,269 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-07-21 16:56:44,270 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 99 [2020-07-21 16:56:44,270 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:56:44,272 INFO L225 Difference]: With dead ends: 163 [2020-07-21 16:56:44,272 INFO L226 Difference]: Without dead ends: 96 [2020-07-21 16:56:44,274 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 208 GetRequests, 182 SyntacticMatches, 2 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 103 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=203, Invalid=447, Unknown=0, NotChecked=0, Total=650 [2020-07-21 16:56:44,275 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 96 states. [2020-07-21 16:56:44,293 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 96 to 86. [2020-07-21 16:56:44,294 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 86 states. [2020-07-21 16:56:44,295 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 86 states to 86 states and 102 transitions. [2020-07-21 16:56:44,295 INFO L78 Accepts]: Start accepts. Automaton has 86 states and 102 transitions. Word has length 99 [2020-07-21 16:56:44,296 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:56:44,296 INFO L479 AbstractCegarLoop]: Abstraction has 86 states and 102 transitions. [2020-07-21 16:56:44,296 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-07-21 16:56:44,296 INFO L276 IsEmpty]: Start isEmpty. Operand 86 states and 102 transitions. [2020-07-21 16:56:44,298 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 107 [2020-07-21 16:56:44,299 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:56:44,299 INFO L422 BasicCegarLoop]: trace histogram [11, 11, 11, 10, 10, 10, 10, 4, 4, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:56:44,512 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:56:44,513 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:56:44,513 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:56:44,514 INFO L82 PathProgramCache]: Analyzing trace with hash -1419871984, now seen corresponding path program 5 times [2020-07-21 16:56:44,514 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:56:44,515 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1718791562] [2020-07-21 16:56:44,515 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:56:44,572 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:56:44,572 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:56:44,573 INFO L263 TraceCheckSpWp]: Trace formula consists of 207 conjuncts, 11 conjunts are in the unsatisfiable core [2020-07-21 16:56:44,578 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:56:44,752 INFO L134 CoverageAnalysis]: Checked inductivity of 424 backedges. 110 proven. 120 refuted. 0 times theorem prover too weak. 194 trivial. 0 not checked. [2020-07-21 16:56:44,752 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:56:44,903 INFO L134 CoverageAnalysis]: Checked inductivity of 424 backedges. 75 proven. 121 refuted. 0 times theorem prover too weak. 228 trivial. 0 not checked. [2020-07-21 16:56:44,904 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1718791562] [2020-07-21 16:56:44,904 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:56:44,904 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12] total 18 [2020-07-21 16:56:44,905 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1671077789] [2020-07-21 16:56:44,905 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-07-21 16:56:44,906 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:56:44,906 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-07-21 16:56:44,909 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=239, Unknown=0, NotChecked=0, Total=306 [2020-07-21 16:56:44,909 INFO L87 Difference]: Start difference. First operand 86 states and 102 transitions. Second operand 18 states. [2020-07-21 16:56:45,945 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:56:45,946 INFO L93 Difference]: Finished difference Result 168 states and 210 transitions. [2020-07-21 16:56:45,946 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2020-07-21 16:56:45,946 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 106 [2020-07-21 16:56:45,947 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:56:45,948 INFO L225 Difference]: With dead ends: 168 [2020-07-21 16:56:45,948 INFO L226 Difference]: Without dead ends: 128 [2020-07-21 16:56:45,950 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 238 GetRequests, 191 SyntacticMatches, 4 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 517 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=472, Invalid=1508, Unknown=0, NotChecked=0, Total=1980 [2020-07-21 16:56:45,950 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 128 states. [2020-07-21 16:56:45,967 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 128 to 99. [2020-07-21 16:56:45,967 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 99 states. [2020-07-21 16:56:45,968 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 99 states to 99 states and 119 transitions. [2020-07-21 16:56:45,968 INFO L78 Accepts]: Start accepts. Automaton has 99 states and 119 transitions. Word has length 106 [2020-07-21 16:56:45,969 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:56:45,969 INFO L479 AbstractCegarLoop]: Abstraction has 99 states and 119 transitions. [2020-07-21 16:56:45,969 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-07-21 16:56:45,969 INFO L276 IsEmpty]: Start isEmpty. Operand 99 states and 119 transitions. [2020-07-21 16:56:45,971 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 124 [2020-07-21 16:56:45,971 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:56:45,972 INFO L422 BasicCegarLoop]: trace histogram [13, 13, 13, 12, 12, 12, 12, 5, 4, 4, 4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:56:46,183 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:56:46,184 INFO L427 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:56:46,185 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:56:46,185 INFO L82 PathProgramCache]: Analyzing trace with hash 1976134303, now seen corresponding path program 6 times [2020-07-21 16:56:46,185 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:56:46,186 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [634115895] [2020-07-21 16:56:46,186 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:56:46,230 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 16:56:46,231 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:56:46,232 INFO L263 TraceCheckSpWp]: Trace formula consists of 155 conjuncts, 9 conjunts are in the unsatisfiable core [2020-07-21 16:56:46,235 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:56:46,361 INFO L134 CoverageAnalysis]: Checked inductivity of 611 backedges. 334 proven. 60 refuted. 0 times theorem prover too weak. 217 trivial. 0 not checked. [2020-07-21 16:56:46,362 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:56:46,511 INFO L134 CoverageAnalysis]: Checked inductivity of 611 backedges. 214 proven. 60 refuted. 0 times theorem prover too weak. 337 trivial. 0 not checked. [2020-07-21 16:56:46,512 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [634115895] [2020-07-21 16:56:46,512 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:56:46,512 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10] total 15 [2020-07-21 16:56:46,513 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [725211358] [2020-07-21 16:56:46,513 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-21 16:56:46,514 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:56:46,514 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-21 16:56:46,514 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=56, Invalid=154, Unknown=0, NotChecked=0, Total=210 [2020-07-21 16:56:46,514 INFO L87 Difference]: Start difference. First operand 99 states and 119 transitions. Second operand 15 states. [2020-07-21 16:56:46,958 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:56:46,959 INFO L93 Difference]: Finished difference Result 186 states and 227 transitions. [2020-07-21 16:56:46,959 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-07-21 16:56:46,960 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 123 [2020-07-21 16:56:46,960 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:56:46,962 INFO L225 Difference]: With dead ends: 186 [2020-07-21 16:56:46,962 INFO L226 Difference]: Without dead ends: 99 [2020-07-21 16:56:46,963 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 261 GetRequests, 232 SyntacticMatches, 3 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 109 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=240, Invalid=516, Unknown=0, NotChecked=0, Total=756 [2020-07-21 16:56:46,964 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 99 states. [2020-07-21 16:56:46,981 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 99 to 92. [2020-07-21 16:56:46,981 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 92 states. [2020-07-21 16:56:46,982 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 92 states to 92 states and 107 transitions. [2020-07-21 16:56:46,983 INFO L78 Accepts]: Start accepts. Automaton has 92 states and 107 transitions. Word has length 123 [2020-07-21 16:56:46,983 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:56:46,983 INFO L479 AbstractCegarLoop]: Abstraction has 92 states and 107 transitions. [2020-07-21 16:56:46,983 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-21 16:56:46,984 INFO L276 IsEmpty]: Start isEmpty. Operand 92 states and 107 transitions. [2020-07-21 16:56:46,985 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 131 [2020-07-21 16:56:46,986 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:56:46,986 INFO L422 BasicCegarLoop]: trace histogram [14, 14, 14, 13, 13, 13, 13, 5, 4, 4, 4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:56:47,201 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:56:47,202 INFO L427 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:56:47,202 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:56:47,203 INFO L82 PathProgramCache]: Analyzing trace with hash -1688384554, now seen corresponding path program 7 times [2020-07-21 16:56:47,203 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:56:47,203 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1971798575] [2020-07-21 16:56:47,204 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:56:47,280 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:56:47,280 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:56:47,282 INFO L263 TraceCheckSpWp]: Trace formula consists of 249 conjuncts, 13 conjunts are in the unsatisfiable core [2020-07-21 16:56:47,285 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:56:47,459 INFO L134 CoverageAnalysis]: Checked inductivity of 703 backedges. 65 proven. 267 refuted. 0 times theorem prover too weak. 371 trivial. 0 not checked. [2020-07-21 16:56:47,460 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:56:47,671 INFO L134 CoverageAnalysis]: Checked inductivity of 703 backedges. 64 proven. 268 refuted. 0 times theorem prover too weak. 371 trivial. 0 not checked. [2020-07-21 16:56:47,671 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1971798575] [2020-07-21 16:56:47,671 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:56:47,672 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14] total 22 [2020-07-21 16:56:47,672 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [356173570] [2020-07-21 16:56:47,672 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-07-21 16:56:47,673 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:56:47,673 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-07-21 16:56:47,674 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=369, Unknown=0, NotChecked=0, Total=462 [2020-07-21 16:56:47,674 INFO L87 Difference]: Start difference. First operand 92 states and 107 transitions. Second operand 22 states. [2020-07-21 16:56:49,283 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:56:49,283 INFO L93 Difference]: Finished difference Result 184 states and 228 transitions. [2020-07-21 16:56:49,283 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2020-07-21 16:56:49,284 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 130 [2020-07-21 16:56:49,284 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:56:49,286 INFO L225 Difference]: With dead ends: 184 [2020-07-21 16:56:49,286 INFO L226 Difference]: Without dead ends: 141 [2020-07-21 16:56:49,290 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 293 GetRequests, 235 SyntacticMatches, 4 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 834 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=721, Invalid=2359, Unknown=0, NotChecked=0, Total=3080 [2020-07-21 16:56:49,291 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 141 states. [2020-07-21 16:56:49,327 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 141 to 107. [2020-07-21 16:56:49,328 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 107 states. [2020-07-21 16:56:49,329 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 107 states to 107 states and 127 transitions. [2020-07-21 16:56:49,330 INFO L78 Accepts]: Start accepts. Automaton has 107 states and 127 transitions. Word has length 130 [2020-07-21 16:56:49,332 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:56:49,332 INFO L479 AbstractCegarLoop]: Abstraction has 107 states and 127 transitions. [2020-07-21 16:56:49,332 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-07-21 16:56:49,333 INFO L276 IsEmpty]: Start isEmpty. Operand 107 states and 127 transitions. [2020-07-21 16:56:49,335 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 155 [2020-07-21 16:56:49,336 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:56:49,336 INFO L422 BasicCegarLoop]: trace histogram [17, 17, 17, 16, 16, 16, 16, 6, 5, 5, 4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:56:49,549 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:56:49,550 INFO L427 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:56:49,550 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:56:49,550 INFO L82 PathProgramCache]: Analyzing trace with hash -840848228, now seen corresponding path program 8 times [2020-07-21 16:56:49,551 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:56:49,551 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1788281955] [2020-07-21 16:56:49,551 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:56:49,609 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:56:49,609 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:56:49,611 INFO L263 TraceCheckSpWp]: Trace formula consists of 291 conjuncts, 11 conjunts are in the unsatisfiable core [2020-07-21 16:56:49,614 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:56:49,772 INFO L134 CoverageAnalysis]: Checked inductivity of 1054 backedges. 551 proven. 122 refuted. 0 times theorem prover too weak. 381 trivial. 0 not checked. [2020-07-21 16:56:49,773 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:56:49,975 INFO L134 CoverageAnalysis]: Checked inductivity of 1054 backedges. 288 proven. 201 refuted. 0 times theorem prover too weak. 565 trivial. 0 not checked. [2020-07-21 16:56:49,976 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1788281955] [2020-07-21 16:56:49,976 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:56:49,976 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12] total 19 [2020-07-21 16:56:49,976 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1492011105] [2020-07-21 16:56:49,977 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-07-21 16:56:49,977 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:56:49,977 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-07-21 16:56:49,977 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=85, Invalid=257, Unknown=0, NotChecked=0, Total=342 [2020-07-21 16:56:49,978 INFO L87 Difference]: Start difference. First operand 107 states and 127 transitions. Second operand 19 states. [2020-07-21 16:56:50,891 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:56:50,891 INFO L93 Difference]: Finished difference Result 206 states and 253 transitions. [2020-07-21 16:56:50,892 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2020-07-21 16:56:50,892 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 154 [2020-07-21 16:56:50,892 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:56:50,894 INFO L225 Difference]: With dead ends: 206 [2020-07-21 16:56:50,895 INFO L226 Difference]: Without dead ends: 123 [2020-07-21 16:56:50,896 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 333 GetRequests, 290 SyntacticMatches, 3 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 289 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=537, Invalid=1185, Unknown=0, NotChecked=0, Total=1722 [2020-07-21 16:56:50,897 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 123 states. [2020-07-21 16:56:50,916 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 123 to 117. [2020-07-21 16:56:50,916 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 117 states. [2020-07-21 16:56:50,917 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 117 states to 117 states and 138 transitions. [2020-07-21 16:56:50,918 INFO L78 Accepts]: Start accepts. Automaton has 117 states and 138 transitions. Word has length 154 [2020-07-21 16:56:50,918 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:56:50,918 INFO L479 AbstractCegarLoop]: Abstraction has 117 states and 138 transitions. [2020-07-21 16:56:50,918 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-07-21 16:56:50,918 INFO L276 IsEmpty]: Start isEmpty. Operand 117 states and 138 transitions. [2020-07-21 16:56:50,920 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 162 [2020-07-21 16:56:50,920 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:56:50,921 INFO L422 BasicCegarLoop]: trace histogram [18, 18, 18, 17, 17, 17, 17, 6, 5, 5, 4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:56:51,134 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:56:51,135 INFO L427 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:56:51,136 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:56:51,136 INFO L82 PathProgramCache]: Analyzing trace with hash 1311982393, now seen corresponding path program 9 times [2020-07-21 16:56:51,136 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:56:51,137 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1523299386] [2020-07-21 16:56:51,137 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:56:51,197 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:56:51,197 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:56:51,199 INFO L263 TraceCheckSpWp]: Trace formula consists of 303 conjuncts, 13 conjunts are in the unsatisfiable core [2020-07-21 16:56:51,202 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:56:51,361 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 16:56:51,363 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 16:56:51,416 INFO L134 CoverageAnalysis]: Checked inductivity of 1175 backedges. 469 proven. 33 refuted. 0 times theorem prover too weak. 673 trivial. 0 not checked. [2020-07-21 16:56:51,417 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:56:51,434 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:56:51,670 INFO L134 CoverageAnalysis]: Checked inductivity of 1175 backedges. 83 proven. 419 refuted. 0 times theorem prover too weak. 673 trivial. 0 not checked. [2020-07-21 16:56:51,671 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1523299386] [2020-07-21 16:56:51,671 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:56:51,671 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14] total 23 [2020-07-21 16:56:51,671 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1762600800] [2020-07-21 16:56:51,672 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-21 16:56:51,672 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:56:51,672 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-21 16:56:51,672 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=151, Invalid=355, Unknown=0, NotChecked=0, Total=506 [2020-07-21 16:56:51,672 INFO L87 Difference]: Start difference. First operand 117 states and 138 transitions. Second operand 23 states. [2020-07-21 16:56:52,555 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:56:52,555 INFO L93 Difference]: Finished difference Result 165 states and 201 transitions. [2020-07-21 16:56:52,556 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2020-07-21 16:56:52,556 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 161 [2020-07-21 16:56:52,557 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:56:52,559 INFO L225 Difference]: With dead ends: 165 [2020-07-21 16:56:52,559 INFO L226 Difference]: Without dead ends: 163 [2020-07-21 16:56:52,560 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 357 GetRequests, 307 SyntacticMatches, 3 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 603 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=725, Invalid=1627, Unknown=0, NotChecked=0, Total=2352 [2020-07-21 16:56:52,561 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 163 states. [2020-07-21 16:56:52,578 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 163 to 136. [2020-07-21 16:56:52,579 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 136 states. [2020-07-21 16:56:52,580 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 136 states to 136 states and 166 transitions. [2020-07-21 16:56:52,580 INFO L78 Accepts]: Start accepts. Automaton has 136 states and 166 transitions. Word has length 161 [2020-07-21 16:56:52,581 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:56:52,581 INFO L479 AbstractCegarLoop]: Abstraction has 136 states and 166 transitions. [2020-07-21 16:56:52,581 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-21 16:56:52,581 INFO L276 IsEmpty]: Start isEmpty. Operand 136 states and 166 transitions. [2020-07-21 16:56:52,583 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 197 [2020-07-21 16:56:52,584 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:56:52,584 INFO L422 BasicCegarLoop]: trace histogram [23, 23, 23, 22, 22, 22, 22, 6, 5, 5, 4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:56:52,790 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:56:52,791 INFO L427 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:56:52,791 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:56:52,792 INFO L82 PathProgramCache]: Analyzing trace with hash -90659728, now seen corresponding path program 10 times [2020-07-21 16:56:52,792 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:56:52,792 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [307110510] [2020-07-21 16:56:52,793 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:56:52,863 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:56:52,863 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:56:52,864 INFO L263 TraceCheckSpWp]: Trace formula consists of 363 conjuncts, 15 conjunts are in the unsatisfiable core [2020-07-21 16:56:52,867 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:56:53,132 INFO L134 CoverageAnalysis]: Checked inductivity of 1885 backedges. 621 proven. 517 refuted. 0 times theorem prover too weak. 747 trivial. 0 not checked. [2020-07-21 16:56:53,132 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:56:53,449 INFO L134 CoverageAnalysis]: Checked inductivity of 1885 backedges. 340 proven. 518 refuted. 0 times theorem prover too weak. 1027 trivial. 0 not checked. [2020-07-21 16:56:53,450 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [307110510] [2020-07-21 16:56:53,450 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:56:53,450 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16] total 26 [2020-07-21 16:56:53,450 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2137907359] [2020-07-21 16:56:53,451 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2020-07-21 16:56:53,451 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:56:53,451 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2020-07-21 16:56:53,452 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=125, Invalid=525, Unknown=0, NotChecked=0, Total=650 [2020-07-21 16:56:53,452 INFO L87 Difference]: Start difference. First operand 136 states and 166 transitions. Second operand 26 states. [2020-07-21 16:56:55,453 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:56:55,454 INFO L93 Difference]: Finished difference Result 278 states and 359 transitions. [2020-07-21 16:56:55,454 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2020-07-21 16:56:55,454 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 196 [2020-07-21 16:56:55,455 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:56:55,457 INFO L225 Difference]: With dead ends: 278 [2020-07-21 16:56:55,457 INFO L226 Difference]: Without dead ends: 206 [2020-07-21 16:56:55,459 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 431 GetRequests, 363 SyntacticMatches, 4 SemanticMatches, 64 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1191 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=1034, Invalid=3256, Unknown=0, NotChecked=0, Total=4290 [2020-07-21 16:56:55,460 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 206 states. [2020-07-21 16:56:55,500 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 206 to 156. [2020-07-21 16:56:55,501 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 156 states. [2020-07-21 16:56:55,502 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 156 states to 156 states and 194 transitions. [2020-07-21 16:56:55,502 INFO L78 Accepts]: Start accepts. Automaton has 156 states and 194 transitions. Word has length 196 [2020-07-21 16:56:55,503 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:56:55,503 INFO L479 AbstractCegarLoop]: Abstraction has 156 states and 194 transitions. [2020-07-21 16:56:55,503 INFO L480 AbstractCegarLoop]: Interpolant automaton has 26 states. [2020-07-21 16:56:55,503 INFO L276 IsEmpty]: Start isEmpty. Operand 156 states and 194 transitions. [2020-07-21 16:56:55,506 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 231 [2020-07-21 16:56:55,507 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:56:55,507 INFO L422 BasicCegarLoop]: trace histogram [27, 27, 27, 26, 26, 26, 26, 7, 6, 6, 5, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:56:55,721 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:56:55,722 INFO L427 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:56:55,722 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:56:55,723 INFO L82 PathProgramCache]: Analyzing trace with hash -1782452330, now seen corresponding path program 11 times [2020-07-21 16:56:55,723 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:56:55,723 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1197553216] [2020-07-21 16:56:55,724 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 15 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:56:55,797 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 16:56:55,797 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:56:55,799 INFO L263 TraceCheckSpWp]: Trace formula consists of 279 conjuncts, 13 conjunts are in the unsatisfiable core [2020-07-21 16:56:55,804 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:56:56,021 INFO L134 CoverageAnalysis]: Checked inductivity of 2642 backedges. 1508 proven. 220 refuted. 0 times theorem prover too weak. 914 trivial. 0 not checked. [2020-07-21 16:56:56,021 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:56:56,327 INFO L134 CoverageAnalysis]: Checked inductivity of 2642 backedges. 735 proven. 399 refuted. 0 times theorem prover too weak. 1508 trivial. 0 not checked. [2020-07-21 16:56:56,328 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1197553216] [2020-07-21 16:56:56,328 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:56:56,328 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14] total 23 [2020-07-21 16:56:56,328 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1883808921] [2020-07-21 16:56:56,329 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-21 16:56:56,329 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:56:56,329 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-21 16:56:56,330 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=120, Invalid=386, Unknown=0, NotChecked=0, Total=506 [2020-07-21 16:56:56,330 INFO L87 Difference]: Start difference. First operand 156 states and 194 transitions. Second operand 23 states. [2020-07-21 16:56:57,420 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:56:57,420 INFO L93 Difference]: Finished difference Result 289 states and 381 transitions. [2020-07-21 16:56:57,421 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2020-07-21 16:56:57,422 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 230 [2020-07-21 16:56:57,422 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:56:57,423 INFO L225 Difference]: With dead ends: 289 [2020-07-21 16:56:57,424 INFO L226 Difference]: Without dead ends: 209 [2020-07-21 16:56:57,426 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 487 GetRequests, 438 SyntacticMatches, 3 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 422 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=658, Invalid=1598, Unknown=0, NotChecked=0, Total=2256 [2020-07-21 16:56:57,426 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 209 states. [2020-07-21 16:56:57,454 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 209 to 190. [2020-07-21 16:56:57,455 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 190 states. [2020-07-21 16:56:57,456 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 190 states to 190 states and 245 transitions. [2020-07-21 16:56:57,457 INFO L78 Accepts]: Start accepts. Automaton has 190 states and 245 transitions. Word has length 230 [2020-07-21 16:56:57,457 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:56:57,458 INFO L479 AbstractCegarLoop]: Abstraction has 190 states and 245 transitions. [2020-07-21 16:56:57,458 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-21 16:56:57,458 INFO L276 IsEmpty]: Start isEmpty. Operand 190 states and 245 transitions. [2020-07-21 16:56:57,461 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 238 [2020-07-21 16:56:57,461 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:56:57,461 INFO L422 BasicCegarLoop]: trace histogram [28, 28, 28, 27, 27, 27, 27, 7, 6, 6, 5, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:56:57,674 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:56:57,675 INFO L427 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:56:57,675 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:56:57,676 INFO L82 PathProgramCache]: Analyzing trace with hash -1051553665, now seen corresponding path program 12 times [2020-07-21 16:56:57,676 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:56:57,676 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [762738350] [2020-07-21 16:56:57,677 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 16 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:56:57,756 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:56:57,756 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:56:57,758 INFO L263 TraceCheckSpWp]: Trace formula consists of 435 conjuncts, 13 conjunts are in the unsatisfiable core [2020-07-21 16:56:57,761 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:56:57,969 INFO L134 CoverageAnalysis]: Checked inductivity of 2834 backedges. 898 proven. 634 refuted. 0 times theorem prover too weak. 1302 trivial. 0 not checked. [2020-07-21 16:56:57,969 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:56:58,233 INFO L134 CoverageAnalysis]: Checked inductivity of 2834 backedges. 467 proven. 635 refuted. 0 times theorem prover too weak. 1732 trivial. 0 not checked. [2020-07-21 16:56:58,234 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [762738350] [2020-07-21 16:56:58,234 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:56:58,234 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14] total 21 [2020-07-21 16:56:58,234 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [545850714] [2020-07-21 16:56:58,235 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-21 16:56:58,235 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:56:58,235 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-21 16:56:58,235 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=90, Invalid=330, Unknown=0, NotChecked=0, Total=420 [2020-07-21 16:56:58,236 INFO L87 Difference]: Start difference. First operand 190 states and 245 transitions. Second operand 21 states. [2020-07-21 16:56:59,774 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:56:59,775 INFO L93 Difference]: Finished difference Result 447 states and 593 transitions. [2020-07-21 16:56:59,775 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2020-07-21 16:56:59,775 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 237 [2020-07-21 16:56:59,776 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:56:59,778 INFO L225 Difference]: With dead ends: 447 [2020-07-21 16:56:59,779 INFO L226 Difference]: Without dead ends: 351 [2020-07-21 16:56:59,781 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 514 GetRequests, 449 SyntacticMatches, 5 SemanticMatches, 60 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1151 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=850, Invalid=2932, Unknown=0, NotChecked=0, Total=3782 [2020-07-21 16:56:59,781 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 351 states. [2020-07-21 16:56:59,829 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 351 to 254. [2020-07-21 16:56:59,830 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 254 states. [2020-07-21 16:56:59,832 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 254 states to 254 states and 328 transitions. [2020-07-21 16:56:59,833 INFO L78 Accepts]: Start accepts. Automaton has 254 states and 328 transitions. Word has length 237 [2020-07-21 16:56:59,833 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:56:59,834 INFO L479 AbstractCegarLoop]: Abstraction has 254 states and 328 transitions. [2020-07-21 16:56:59,834 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-21 16:56:59,834 INFO L276 IsEmpty]: Start isEmpty. Operand 254 states and 328 transitions. [2020-07-21 16:56:59,838 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 262 [2020-07-21 16:56:59,838 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:56:59,839 INFO L422 BasicCegarLoop]: trace histogram [31, 31, 31, 30, 30, 30, 30, 8, 7, 7, 5, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:57:00,053 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:57:00,054 INFO L427 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:57:00,054 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:57:00,055 INFO L82 PathProgramCache]: Analyzing trace with hash 1090659833, now seen corresponding path program 13 times [2020-07-21 16:57:00,055 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:57:00,055 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [922005056] [2020-07-21 16:57:00,056 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 17 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:57:00,125 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 16:57:00,126 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:57:00,128 INFO L263 TraceCheckSpWp]: Trace formula consists of 316 conjuncts, 11 conjunts are in the unsatisfiable core [2020-07-21 16:57:00,132 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:57:00,297 INFO L134 CoverageAnalysis]: Checked inductivity of 3506 backedges. 1861 proven. 224 refuted. 0 times theorem prover too weak. 1421 trivial. 0 not checked. [2020-07-21 16:57:00,298 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:57:00,562 INFO L134 CoverageAnalysis]: Checked inductivity of 3506 backedges. 1123 proven. 224 refuted. 0 times theorem prover too weak. 2159 trivial. 0 not checked. [2020-07-21 16:57:00,562 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [922005056] [2020-07-21 16:57:00,562 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:57:00,563 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12] total 18 [2020-07-21 16:57:00,563 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1597655206] [2020-07-21 16:57:00,564 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-07-21 16:57:00,564 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:57:00,564 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-07-21 16:57:00,565 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=228, Unknown=0, NotChecked=0, Total=306 [2020-07-21 16:57:00,565 INFO L87 Difference]: Start difference. First operand 254 states and 328 transitions. Second operand 18 states. [2020-07-21 16:57:01,292 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:57:01,292 INFO L93 Difference]: Finished difference Result 363 states and 475 transitions. [2020-07-21 16:57:01,292 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2020-07-21 16:57:01,293 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 261 [2020-07-21 16:57:01,293 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:57:01,295 INFO L225 Difference]: With dead ends: 363 [2020-07-21 16:57:01,295 INFO L226 Difference]: Without dead ends: 206 [2020-07-21 16:57:01,296 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 545 GetRequests, 505 SyntacticMatches, 4 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 226 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=429, Invalid=977, Unknown=0, NotChecked=0, Total=1406 [2020-07-21 16:57:01,297 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 206 states. [2020-07-21 16:57:01,325 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 206 to 206. [2020-07-21 16:57:01,326 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 206 states. [2020-07-21 16:57:01,327 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 206 states to 206 states and 263 transitions. [2020-07-21 16:57:01,328 INFO L78 Accepts]: Start accepts. Automaton has 206 states and 263 transitions. Word has length 261 [2020-07-21 16:57:01,328 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:57:01,328 INFO L479 AbstractCegarLoop]: Abstraction has 206 states and 263 transitions. [2020-07-21 16:57:01,329 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-07-21 16:57:01,329 INFO L276 IsEmpty]: Start isEmpty. Operand 206 states and 263 transitions. [2020-07-21 16:57:01,331 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 269 [2020-07-21 16:57:01,331 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:57:01,331 INFO L422 BasicCegarLoop]: trace histogram [32, 32, 32, 31, 31, 31, 31, 8, 7, 7, 5, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:57:01,545 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:57:01,546 INFO L427 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:57:01,546 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:57:01,547 INFO L82 PathProgramCache]: Analyzing trace with hash -431748828, now seen corresponding path program 14 times [2020-07-21 16:57:01,547 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:57:01,548 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1032306096] [2020-07-21 16:57:01,548 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 18 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:57:01,642 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:57:01,643 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:57:01,645 INFO L263 TraceCheckSpWp]: Trace formula consists of 489 conjuncts, 15 conjunts are in the unsatisfiable core [2020-07-21 16:57:01,649 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:57:01,915 INFO L134 CoverageAnalysis]: Checked inductivity of 3727 backedges. 909 proven. 1045 refuted. 0 times theorem prover too weak. 1773 trivial. 0 not checked. [2020-07-21 16:57:01,915 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:57:02,311 INFO L134 CoverageAnalysis]: Checked inductivity of 3727 backedges. 484 proven. 1046 refuted. 0 times theorem prover too weak. 2197 trivial. 0 not checked. [2020-07-21 16:57:02,315 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1032306096] [2020-07-21 16:57:02,319 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:57:02,320 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16] total 25 [2020-07-21 16:57:02,320 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1873095009] [2020-07-21 16:57:02,321 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-07-21 16:57:02,321 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:57:02,321 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-07-21 16:57:02,322 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=119, Invalid=481, Unknown=0, NotChecked=0, Total=600 [2020-07-21 16:57:02,322 INFO L87 Difference]: Start difference. First operand 206 states and 263 transitions. Second operand 25 states. [2020-07-21 16:57:05,081 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:57:05,082 INFO L93 Difference]: Finished difference Result 364 states and 481 transitions. [2020-07-21 16:57:05,082 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 63 states. [2020-07-21 16:57:05,082 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 268 [2020-07-21 16:57:05,083 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:57:05,085 INFO L225 Difference]: With dead ends: 364 [2020-07-21 16:57:05,086 INFO L226 Difference]: Without dead ends: 258 [2020-07-21 16:57:05,090 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 591 GetRequests, 507 SyntacticMatches, 5 SemanticMatches, 79 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2058 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=1434, Invalid=5046, Unknown=0, NotChecked=0, Total=6480 [2020-07-21 16:57:05,090 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 258 states. [2020-07-21 16:57:05,134 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 258 to 224. [2020-07-21 16:57:05,134 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 224 states. [2020-07-21 16:57:05,136 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 224 states to 224 states and 287 transitions. [2020-07-21 16:57:05,137 INFO L78 Accepts]: Start accepts. Automaton has 224 states and 287 transitions. Word has length 268 [2020-07-21 16:57:05,137 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:57:05,137 INFO L479 AbstractCegarLoop]: Abstraction has 224 states and 287 transitions. [2020-07-21 16:57:05,138 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-07-21 16:57:05,138 INFO L276 IsEmpty]: Start isEmpty. Operand 224 states and 287 transitions. [2020-07-21 16:57:05,141 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 300 [2020-07-21 16:57:05,141 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:57:05,141 INFO L422 BasicCegarLoop]: trace histogram [36, 36, 36, 35, 35, 35, 35, 9, 8, 8, 5, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:57:05,354 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:57:05,355 INFO L427 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:57:05,355 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:57:05,356 INFO L82 PathProgramCache]: Analyzing trace with hash -935543841, now seen corresponding path program 15 times [2020-07-21 16:57:05,356 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:57:05,356 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [748273903] [2020-07-21 16:57:05,357 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 19 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:57:05,452 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:57:05,452 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:57:05,454 INFO L263 TraceCheckSpWp]: Trace formula consists of 543 conjuncts, 13 conjunts are in the unsatisfiable core [2020-07-21 16:57:05,459 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:57:05,702 INFO L134 CoverageAnalysis]: Checked inductivity of 4743 backedges. 2489 proven. 351 refuted. 0 times theorem prover too weak. 1903 trivial. 0 not checked. [2020-07-21 16:57:05,702 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:57:06,050 INFO L134 CoverageAnalysis]: Checked inductivity of 4743 backedges. 1293 proven. 629 refuted. 0 times theorem prover too weak. 2821 trivial. 0 not checked. [2020-07-21 16:57:06,050 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [748273903] [2020-07-21 16:57:06,050 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:57:06,051 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14] total 22 [2020-07-21 16:57:06,051 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1352811168] [2020-07-21 16:57:06,051 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-07-21 16:57:06,052 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:57:06,052 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-07-21 16:57:06,052 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=111, Invalid=351, Unknown=0, NotChecked=0, Total=462 [2020-07-21 16:57:06,052 INFO L87 Difference]: Start difference. First operand 224 states and 287 transitions. Second operand 22 states. [2020-07-21 16:57:07,362 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:57:07,362 INFO L93 Difference]: Finished difference Result 320 states and 417 transitions. [2020-07-21 16:57:07,366 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2020-07-21 16:57:07,366 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 299 [2020-07-21 16:57:07,367 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:57:07,368 INFO L225 Difference]: With dead ends: 320 [2020-07-21 16:57:07,368 INFO L226 Difference]: Without dead ends: 224 [2020-07-21 16:57:07,370 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 633 GetRequests, 577 SyntacticMatches, 4 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 541 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=837, Invalid=2025, Unknown=0, NotChecked=0, Total=2862 [2020-07-21 16:57:07,371 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 224 states. [2020-07-21 16:57:07,397 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 224 to 193. [2020-07-21 16:57:07,398 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 193 states. [2020-07-21 16:57:07,399 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 193 states to 193 states and 238 transitions. [2020-07-21 16:57:07,399 INFO L78 Accepts]: Start accepts. Automaton has 193 states and 238 transitions. Word has length 299 [2020-07-21 16:57:07,400 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:57:07,400 INFO L479 AbstractCegarLoop]: Abstraction has 193 states and 238 transitions. [2020-07-21 16:57:07,400 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-07-21 16:57:07,400 INFO L276 IsEmpty]: Start isEmpty. Operand 193 states and 238 transitions. [2020-07-21 16:57:07,402 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 307 [2020-07-21 16:57:07,402 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:57:07,403 INFO L422 BasicCegarLoop]: trace histogram [37, 37, 37, 36, 36, 36, 36, 9, 8, 8, 5, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:57:07,616 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:57:07,617 INFO L427 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:57:07,617 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:57:07,617 INFO L82 PathProgramCache]: Analyzing trace with hash 221652094, now seen corresponding path program 16 times [2020-07-21 16:57:07,617 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:57:07,618 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1339847829] [2020-07-21 16:57:07,618 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 20 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:57:07,714 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:57:07,715 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:57:07,717 INFO L263 TraceCheckSpWp]: Trace formula consists of 555 conjuncts, 17 conjunts are in the unsatisfiable core [2020-07-21 16:57:07,722 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:57:08,192 INFO L134 CoverageAnalysis]: Checked inductivity of 5000 backedges. 875 proven. 1633 refuted. 0 times theorem prover too weak. 2492 trivial. 0 not checked. [2020-07-21 16:57:08,192 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:57:08,817 INFO L134 CoverageAnalysis]: Checked inductivity of 5000 backedges. 484 proven. 1634 refuted. 0 times theorem prover too weak. 2882 trivial. 0 not checked. [2020-07-21 16:57:08,818 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1339847829] [2020-07-21 16:57:08,818 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:57:08,818 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18] total 29 [2020-07-21 16:57:08,819 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1332083936] [2020-07-21 16:57:08,821 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-07-21 16:57:08,821 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:57:08,821 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-07-21 16:57:08,822 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=154, Invalid=658, Unknown=0, NotChecked=0, Total=812 [2020-07-21 16:57:08,822 INFO L87 Difference]: Start difference. First operand 193 states and 238 transitions. Second operand 29 states. [2020-07-21 16:57:12,493 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:57:12,494 INFO L93 Difference]: Finished difference Result 343 states and 444 transitions. [2020-07-21 16:57:12,494 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 71 states. [2020-07-21 16:57:12,495 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 306 [2020-07-21 16:57:12,495 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:57:12,497 INFO L225 Difference]: With dead ends: 343 [2020-07-21 16:57:12,497 INFO L226 Difference]: Without dead ends: 265 [2020-07-21 16:57:12,501 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 675 GetRequests, 579 SyntacticMatches, 5 SemanticMatches, 91 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2751 ImplicationChecksByTransitivity, 3.1s TimeCoverageRelationStatistics Valid=1903, Invalid=6653, Unknown=0, NotChecked=0, Total=8556 [2020-07-21 16:57:12,502 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 265 states. [2020-07-21 16:57:12,537 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 265 to 214. [2020-07-21 16:57:12,537 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 214 states. [2020-07-21 16:57:12,539 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 214 states to 214 states and 266 transitions. [2020-07-21 16:57:12,539 INFO L78 Accepts]: Start accepts. Automaton has 214 states and 266 transitions. Word has length 306 [2020-07-21 16:57:12,540 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:57:12,540 INFO L479 AbstractCegarLoop]: Abstraction has 214 states and 266 transitions. [2020-07-21 16:57:12,540 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-07-21 16:57:12,540 INFO L276 IsEmpty]: Start isEmpty. Operand 214 states and 266 transitions. [2020-07-21 16:57:12,542 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 345 [2020-07-21 16:57:12,542 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:57:12,543 INFO L422 BasicCegarLoop]: trace histogram [42, 42, 42, 41, 41, 41, 41, 10, 9, 9, 5, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:57:12,756 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:57:12,757 INFO L427 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:57:12,757 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:57:12,758 INFO L82 PathProgramCache]: Analyzing trace with hash 856878168, now seen corresponding path program 17 times [2020-07-21 16:57:12,758 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:57:12,759 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2129441530] [2020-07-21 16:57:12,759 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 21 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:57:12,879 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:57:12,880 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:57:12,881 INFO L263 TraceCheckSpWp]: Trace formula consists of 621 conjuncts, 15 conjunts are in the unsatisfiable core [2020-07-21 16:57:12,886 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:57:13,186 INFO L134 CoverageAnalysis]: Checked inductivity of 6461 backedges. 3316 proven. 523 refuted. 0 times theorem prover too weak. 2622 trivial. 0 not checked. [2020-07-21 16:57:13,186 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:57:13,652 INFO L134 CoverageAnalysis]: Checked inductivity of 6461 backedges. 1566 proven. 1139 refuted. 0 times theorem prover too weak. 3756 trivial. 0 not checked. [2020-07-21 16:57:13,653 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2129441530] [2020-07-21 16:57:13,653 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:57:13,653 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16] total 26 [2020-07-21 16:57:13,653 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [422023709] [2020-07-21 16:57:13,654 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2020-07-21 16:57:13,654 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:57:13,654 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2020-07-21 16:57:13,654 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=150, Invalid=500, Unknown=0, NotChecked=0, Total=650 [2020-07-21 16:57:13,655 INFO L87 Difference]: Start difference. First operand 214 states and 266 transitions. Second operand 26 states. [2020-07-21 16:57:15,756 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:57:15,757 INFO L93 Difference]: Finished difference Result 416 states and 539 transitions. [2020-07-21 16:57:15,758 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 54 states. [2020-07-21 16:57:15,758 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 344 [2020-07-21 16:57:15,759 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:57:15,761 INFO L225 Difference]: With dead ends: 416 [2020-07-21 16:57:15,761 INFO L226 Difference]: Without dead ends: 262 [2020-07-21 16:57:15,763 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 737 GetRequests, 663 SyntacticMatches, 4 SemanticMatches, 70 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1082 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=1502, Invalid=3610, Unknown=0, NotChecked=0, Total=5112 [2020-07-21 16:57:15,764 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 262 states. [2020-07-21 16:57:15,806 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 262 to 248. [2020-07-21 16:57:15,806 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 248 states. [2020-07-21 16:57:15,807 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 248 states to 248 states and 315 transitions. [2020-07-21 16:57:15,808 INFO L78 Accepts]: Start accepts. Automaton has 248 states and 315 transitions. Word has length 344 [2020-07-21 16:57:15,808 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:57:15,808 INFO L479 AbstractCegarLoop]: Abstraction has 248 states and 315 transitions. [2020-07-21 16:57:15,809 INFO L480 AbstractCegarLoop]: Interpolant automaton has 26 states. [2020-07-21 16:57:15,809 INFO L276 IsEmpty]: Start isEmpty. Operand 248 states and 315 transitions. [2020-07-21 16:57:15,811 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 352 [2020-07-21 16:57:15,811 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:57:15,812 INFO L422 BasicCegarLoop]: trace histogram [43, 43, 43, 42, 42, 42, 42, 10, 9, 9, 5, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:57:16,027 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:57:16,028 INFO L427 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:57:16,028 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:57:16,029 INFO L82 PathProgramCache]: Analyzing trace with hash 930621925, now seen corresponding path program 18 times [2020-07-21 16:57:16,029 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:57:16,029 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2121319338] [2020-07-21 16:57:16,029 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 22 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:57:16,135 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:57:16,136 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:57:16,138 INFO L263 TraceCheckSpWp]: Trace formula consists of 633 conjuncts, 19 conjunts are in the unsatisfiable core [2020-07-21 16:57:16,142 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:57:16,562 INFO L134 CoverageAnalysis]: Checked inductivity of 6761 backedges. 775 proven. 2452 refuted. 0 times theorem prover too weak. 3534 trivial. 0 not checked. [2020-07-21 16:57:16,562 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:57:17,135 INFO L134 CoverageAnalysis]: Checked inductivity of 6761 backedges. 458 proven. 2453 refuted. 0 times theorem prover too weak. 3850 trivial. 0 not checked. [2020-07-21 16:57:17,136 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2121319338] [2020-07-21 16:57:17,136 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:57:17,136 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20] total 33 [2020-07-21 16:57:17,136 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1704489309] [2020-07-21 16:57:17,137 INFO L459 AbstractCegarLoop]: Interpolant automaton has 33 states [2020-07-21 16:57:17,137 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:57:17,137 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2020-07-21 16:57:17,138 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=195, Invalid=861, Unknown=0, NotChecked=0, Total=1056 [2020-07-21 16:57:17,138 INFO L87 Difference]: Start difference. First operand 248 states and 315 transitions. Second operand 33 states. [2020-07-21 16:57:21,844 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:57:21,845 INFO L93 Difference]: Finished difference Result 453 states and 590 transitions. [2020-07-21 16:57:21,845 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 81 states. [2020-07-21 16:57:21,846 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 351 [2020-07-21 16:57:21,846 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:57:21,848 INFO L225 Difference]: With dead ends: 453 [2020-07-21 16:57:21,848 INFO L226 Difference]: Without dead ends: 331 [2020-07-21 16:57:21,851 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 775 GetRequests, 665 SyntacticMatches, 5 SemanticMatches, 105 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3651 ImplicationChecksByTransitivity, 3.9s TimeCoverageRelationStatistics Valid=2557, Invalid=8785, Unknown=0, NotChecked=0, Total=11342 [2020-07-21 16:57:21,852 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 331 states. [2020-07-21 16:57:21,906 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 331 to 274. [2020-07-21 16:57:21,906 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 274 states. [2020-07-21 16:57:21,908 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 274 states to 274 states and 351 transitions. [2020-07-21 16:57:21,908 INFO L78 Accepts]: Start accepts. Automaton has 274 states and 351 transitions. Word has length 351 [2020-07-21 16:57:21,909 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:57:21,909 INFO L479 AbstractCegarLoop]: Abstraction has 274 states and 351 transitions. [2020-07-21 16:57:21,909 INFO L480 AbstractCegarLoop]: Interpolant automaton has 33 states. [2020-07-21 16:57:21,910 INFO L276 IsEmpty]: Start isEmpty. Operand 274 states and 351 transitions. [2020-07-21 16:57:21,913 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 400 [2020-07-21 16:57:21,914 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:57:21,914 INFO L422 BasicCegarLoop]: trace histogram [49, 49, 49, 48, 48, 48, 48, 11, 10, 10, 6, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:57:22,148 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:57:22,148 INFO L427 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:57:22,149 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:57:22,149 INFO L82 PathProgramCache]: Analyzing trace with hash 1703194347, now seen corresponding path program 19 times [2020-07-21 16:57:22,149 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:57:22,150 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [92276504] [2020-07-21 16:57:22,150 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 23 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:57:22,280 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:57:22,280 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:57:22,283 INFO L263 TraceCheckSpWp]: Trace formula consists of 717 conjuncts, 17 conjunts are in the unsatisfiable core [2020-07-21 16:57:22,289 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:57:22,699 INFO L134 CoverageAnalysis]: Checked inductivity of 8813 backedges. 4410 proven. 749 refuted. 0 times theorem prover too weak. 3654 trivial. 0 not checked. [2020-07-21 16:57:22,699 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:57:23,319 INFO L134 CoverageAnalysis]: Checked inductivity of 8813 backedges. 2010 proven. 1763 refuted. 0 times theorem prover too weak. 5040 trivial. 0 not checked. [2020-07-21 16:57:23,319 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [92276504] [2020-07-21 16:57:23,320 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:57:23,320 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18] total 30 [2020-07-21 16:57:23,320 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1135478271] [2020-07-21 16:57:23,321 INFO L459 AbstractCegarLoop]: Interpolant automaton has 30 states [2020-07-21 16:57:23,322 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:57:23,322 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2020-07-21 16:57:23,322 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=195, Invalid=675, Unknown=0, NotChecked=0, Total=870 [2020-07-21 16:57:23,322 INFO L87 Difference]: Start difference. First operand 274 states and 351 transitions. Second operand 30 states. [2020-07-21 16:57:25,757 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:57:25,757 INFO L93 Difference]: Finished difference Result 444 states and 588 transitions. [2020-07-21 16:57:25,759 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 56 states. [2020-07-21 16:57:25,760 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 399 [2020-07-21 16:57:25,760 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:57:25,762 INFO L225 Difference]: With dead ends: 444 [2020-07-21 16:57:25,762 INFO L226 Difference]: Without dead ends: 321 [2020-07-21 16:57:25,764 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 848 GetRequests, 769 SyntacticMatches, 4 SemanticMatches, 75 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1255 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=1660, Invalid=4192, Unknown=0, NotChecked=0, Total=5852 [2020-07-21 16:57:25,764 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 321 states. [2020-07-21 16:57:25,826 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 321 to 308. [2020-07-21 16:57:25,827 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 308 states. [2020-07-21 16:57:25,828 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 308 states to 308 states and 400 transitions. [2020-07-21 16:57:25,829 INFO L78 Accepts]: Start accepts. Automaton has 308 states and 400 transitions. Word has length 399 [2020-07-21 16:57:25,830 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:57:25,830 INFO L479 AbstractCegarLoop]: Abstraction has 308 states and 400 transitions. [2020-07-21 16:57:25,830 INFO L480 AbstractCegarLoop]: Interpolant automaton has 30 states. [2020-07-21 16:57:25,830 INFO L276 IsEmpty]: Start isEmpty. Operand 308 states and 400 transitions. [2020-07-21 16:57:25,833 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 407 [2020-07-21 16:57:25,833 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:57:25,834 INFO L422 BasicCegarLoop]: trace histogram [50, 50, 50, 49, 49, 49, 49, 11, 10, 10, 6, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:57:26,048 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:57:26,049 INFO L427 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:57:26,049 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:57:26,050 INFO L82 PathProgramCache]: Analyzing trace with hash -1852909686, now seen corresponding path program 20 times [2020-07-21 16:57:26,050 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:57:26,050 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1673839364] [2020-07-21 16:57:26,050 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 24 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:57:26,176 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:57:26,176 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:57:26,180 INFO L263 TraceCheckSpWp]: Trace formula consists of 729 conjuncts, 15 conjunts are in the unsatisfiable core [2020-07-21 16:57:26,187 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:57:26,491 INFO L134 CoverageAnalysis]: Checked inductivity of 9163 backedges. 1480 proven. 2573 refuted. 0 times theorem prover too weak. 5110 trivial. 0 not checked. [2020-07-21 16:57:26,491 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:57:26,961 INFO L134 CoverageAnalysis]: Checked inductivity of 9163 backedges. 767 proven. 2574 refuted. 0 times theorem prover too weak. 5822 trivial. 0 not checked. [2020-07-21 16:57:26,962 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1673839364] [2020-07-21 16:57:26,962 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:57:26,962 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16] total 24 [2020-07-21 16:57:26,962 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2080436936] [2020-07-21 16:57:26,963 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-07-21 16:57:26,963 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:57:26,963 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-07-21 16:57:26,963 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=117, Invalid=435, Unknown=0, NotChecked=0, Total=552 [2020-07-21 16:57:26,963 INFO L87 Difference]: Start difference. First operand 308 states and 400 transitions. Second operand 24 states. [2020-07-21 16:57:29,491 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:57:29,492 INFO L93 Difference]: Finished difference Result 708 states and 943 transitions. [2020-07-21 16:57:29,492 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 64 states. [2020-07-21 16:57:29,492 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 406 [2020-07-21 16:57:29,493 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:57:29,497 INFO L225 Difference]: With dead ends: 708 [2020-07-21 16:57:29,497 INFO L226 Difference]: Without dead ends: 575 [2020-07-21 16:57:29,499 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 868 GetRequests, 783 SyntacticMatches, 6 SemanticMatches, 79 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2182 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=1394, Invalid=5086, Unknown=0, NotChecked=0, Total=6480 [2020-07-21 16:57:29,501 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 575 states. [2020-07-21 16:57:29,586 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 575 to 408. [2020-07-21 16:57:29,587 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 408 states. [2020-07-21 16:57:29,589 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 408 states to 408 states and 530 transitions. [2020-07-21 16:57:29,589 INFO L78 Accepts]: Start accepts. Automaton has 408 states and 530 transitions. Word has length 406 [2020-07-21 16:57:29,590 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:57:29,590 INFO L479 AbstractCegarLoop]: Abstraction has 408 states and 530 transitions. [2020-07-21 16:57:29,590 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-07-21 16:57:29,590 INFO L276 IsEmpty]: Start isEmpty. Operand 408 states and 530 transitions. [2020-07-21 16:57:29,594 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 438 [2020-07-21 16:57:29,594 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:57:29,594 INFO L422 BasicCegarLoop]: trace histogram [54, 54, 54, 53, 53, 53, 53, 12, 11, 11, 6, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:57:29,809 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:57:29,810 INFO L427 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:57:29,810 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:57:29,811 INFO L82 PathProgramCache]: Analyzing trace with hash 1246863545, now seen corresponding path program 21 times [2020-07-21 16:57:29,811 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:57:29,811 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1281098078] [2020-07-21 16:57:29,812 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 25 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:57:29,949 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:57:29,949 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:57:29,955 INFO L263 TraceCheckSpWp]: Trace formula consists of 783 conjuncts, 13 conjunts are in the unsatisfiable core [2020-07-21 16:57:29,962 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:57:30,256 INFO L134 CoverageAnalysis]: Checked inductivity of 10723 backedges. 4950 proven. 605 refuted. 0 times theorem prover too weak. 5168 trivial. 0 not checked. [2020-07-21 16:57:30,256 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:57:30,852 INFO L134 CoverageAnalysis]: Checked inductivity of 10723 backedges. 3384 proven. 605 refuted. 0 times theorem prover too weak. 6734 trivial. 0 not checked. [2020-07-21 16:57:30,853 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1281098078] [2020-07-21 16:57:30,853 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:57:30,853 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14] total 21 [2020-07-21 16:57:30,853 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1991595926] [2020-07-21 16:57:30,854 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-21 16:57:30,855 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:57:30,855 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-21 16:57:30,855 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=104, Invalid=316, Unknown=0, NotChecked=0, Total=420 [2020-07-21 16:57:30,855 INFO L87 Difference]: Start difference. First operand 408 states and 530 transitions. Second operand 21 states. [2020-07-21 16:57:32,277 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:57:32,277 INFO L93 Difference]: Finished difference Result 557 states and 733 transitions. [2020-07-21 16:57:32,278 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2020-07-21 16:57:32,278 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 437 [2020-07-21 16:57:32,279 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:57:32,280 INFO L225 Difference]: With dead ends: 557 [2020-07-21 16:57:32,281 INFO L226 Difference]: Without dead ends: 327 [2020-07-21 16:57:32,282 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 905 GetRequests, 854 SyntacticMatches, 5 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 401 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=675, Invalid=1581, Unknown=0, NotChecked=0, Total=2256 [2020-07-21 16:57:32,283 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 327 states. [2020-07-21 16:57:32,345 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 327 to 327. [2020-07-21 16:57:32,345 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 327 states. [2020-07-21 16:57:32,347 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 327 states to 327 states and 422 transitions. [2020-07-21 16:57:32,347 INFO L78 Accepts]: Start accepts. Automaton has 327 states and 422 transitions. Word has length 437 [2020-07-21 16:57:32,348 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:57:32,348 INFO L479 AbstractCegarLoop]: Abstraction has 327 states and 422 transitions. [2020-07-21 16:57:32,348 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-21 16:57:32,348 INFO L276 IsEmpty]: Start isEmpty. Operand 327 states and 422 transitions. [2020-07-21 16:57:32,351 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 445 [2020-07-21 16:57:32,352 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:57:32,352 INFO L422 BasicCegarLoop]: trace histogram [55, 55, 55, 54, 54, 54, 54, 12, 11, 11, 6, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:57:32,565 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:57:32,566 INFO L427 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:57:32,566 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:57:32,566 INFO L82 PathProgramCache]: Analyzing trace with hash -833030556, now seen corresponding path program 22 times [2020-07-21 16:57:32,566 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:57:32,566 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1396147081] [2020-07-21 16:57:32,567 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 26 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 26 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:57:32,692 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:57:32,692 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:57:32,695 INFO L263 TraceCheckSpWp]: Trace formula consists of 795 conjuncts, 17 conjunts are in the unsatisfiable core [2020-07-21 16:57:32,700 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:57:33,112 INFO L134 CoverageAnalysis]: Checked inductivity of 11109 backedges. 1317 proven. 3531 refuted. 0 times theorem prover too weak. 6261 trivial. 0 not checked. [2020-07-21 16:57:33,113 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:57:33,683 INFO L134 CoverageAnalysis]: Checked inductivity of 11109 backedges. 710 proven. 3532 refuted. 0 times theorem prover too weak. 6867 trivial. 0 not checked. [2020-07-21 16:57:33,683 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1396147081] [2020-07-21 16:57:33,683 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:57:33,684 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18] total 28 [2020-07-21 16:57:33,684 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1229218801] [2020-07-21 16:57:33,684 INFO L459 AbstractCegarLoop]: Interpolant automaton has 28 states [2020-07-21 16:57:33,684 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:57:33,685 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2020-07-21 16:57:33,685 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=149, Invalid=607, Unknown=0, NotChecked=0, Total=756 [2020-07-21 16:57:33,685 INFO L87 Difference]: Start difference. First operand 327 states and 422 transitions. Second operand 28 states. [2020-07-21 16:57:38,300 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:57:38,301 INFO L93 Difference]: Finished difference Result 545 states and 722 transitions. [2020-07-21 16:57:38,301 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 90 states. [2020-07-21 16:57:38,301 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 444 [2020-07-21 16:57:38,302 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:57:38,304 INFO L225 Difference]: With dead ends: 545 [2020-07-21 16:57:38,304 INFO L226 Difference]: Without dead ends: 402 [2020-07-21 16:57:38,305 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 970 GetRequests, 855 SyntacticMatches, 6 SemanticMatches, 109 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4405 ImplicationChecksByTransitivity, 3.8s TimeCoverageRelationStatistics Valid=2533, Invalid=9677, Unknown=0, NotChecked=0, Total=12210 [2020-07-21 16:57:38,306 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 402 states. [2020-07-21 16:57:38,373 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 402 to 348. [2020-07-21 16:57:38,373 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 348 states. [2020-07-21 16:57:38,374 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 348 states to 348 states and 450 transitions. [2020-07-21 16:57:38,375 INFO L78 Accepts]: Start accepts. Automaton has 348 states and 450 transitions. Word has length 444 [2020-07-21 16:57:38,375 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:57:38,375 INFO L479 AbstractCegarLoop]: Abstraction has 348 states and 450 transitions. [2020-07-21 16:57:38,375 INFO L480 AbstractCegarLoop]: Interpolant automaton has 28 states. [2020-07-21 16:57:38,375 INFO L276 IsEmpty]: Start isEmpty. Operand 348 states and 450 transitions. [2020-07-21 16:57:38,379 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 483 [2020-07-21 16:57:38,379 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:57:38,379 INFO L422 BasicCegarLoop]: trace histogram [60, 60, 60, 59, 59, 59, 59, 13, 12, 12, 6, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:57:38,591 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:57:38,592 INFO L427 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:57:38,592 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:57:38,593 INFO L82 PathProgramCache]: Analyzing trace with hash 1802445246, now seen corresponding path program 23 times [2020-07-21 16:57:38,593 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:57:38,593 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1967576759] [2020-07-21 16:57:38,594 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 27 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 27 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:57:38,745 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:57:38,745 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:57:38,750 INFO L263 TraceCheckSpWp]: Trace formula consists of 861 conjuncts, 15 conjunts are in the unsatisfiable core [2020-07-21 16:57:38,757 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:57:39,153 INFO L134 CoverageAnalysis]: Checked inductivity of 13243 backedges. 6090 proven. 834 refuted. 0 times theorem prover too weak. 6319 trivial. 0 not checked. [2020-07-21 16:57:39,153 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:57:39,943 INFO L134 CoverageAnalysis]: Checked inductivity of 13243 backedges. 3585 proven. 1557 refuted. 0 times theorem prover too weak. 8101 trivial. 0 not checked. [2020-07-21 16:57:39,943 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1967576759] [2020-07-21 16:57:39,943 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:57:39,944 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16] total 25 [2020-07-21 16:57:39,944 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2066200765] [2020-07-21 16:57:39,945 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-07-21 16:57:39,945 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:57:39,946 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-07-21 16:57:39,946 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=141, Invalid=459, Unknown=0, NotChecked=0, Total=600 [2020-07-21 16:57:39,947 INFO L87 Difference]: Start difference. First operand 348 states and 450 transitions. Second operand 25 states. [2020-07-21 16:57:41,937 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:57:41,937 INFO L93 Difference]: Finished difference Result 481 states and 632 transitions. [2020-07-21 16:57:41,938 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2020-07-21 16:57:41,938 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 482 [2020-07-21 16:57:41,939 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:57:41,943 INFO L225 Difference]: With dead ends: 481 [2020-07-21 16:57:41,943 INFO L226 Difference]: Without dead ends: 348 [2020-07-21 16:57:41,945 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1010 GetRequests, 940 SyntacticMatches, 5 SemanticMatches, 65 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 902 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=1270, Invalid=3152, Unknown=0, NotChecked=0, Total=4422 [2020-07-21 16:57:41,945 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 348 states. [2020-07-21 16:57:42,016 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 348 to 348. [2020-07-21 16:57:42,016 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 348 states. [2020-07-21 16:57:42,018 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 348 states to 348 states and 448 transitions. [2020-07-21 16:57:42,018 INFO L78 Accepts]: Start accepts. Automaton has 348 states and 448 transitions. Word has length 482 [2020-07-21 16:57:42,019 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:57:42,019 INFO L479 AbstractCegarLoop]: Abstraction has 348 states and 448 transitions. [2020-07-21 16:57:42,019 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-07-21 16:57:42,019 INFO L276 IsEmpty]: Start isEmpty. Operand 348 states and 448 transitions. [2020-07-21 16:57:42,023 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 490 [2020-07-21 16:57:42,023 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:57:42,023 INFO L422 BasicCegarLoop]: trace histogram [61, 61, 61, 60, 60, 60, 60, 13, 12, 12, 6, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:57:42,238 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:57:42,239 INFO L427 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:57:42,239 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:57:42,240 INFO L82 PathProgramCache]: Analyzing trace with hash 564016575, now seen corresponding path program 24 times [2020-07-21 16:57:42,240 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:57:42,240 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1973334118] [2020-07-21 16:57:42,240 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 28 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 28 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:57:42,381 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:57:42,382 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:57:42,385 INFO L263 TraceCheckSpWp]: Trace formula consists of 873 conjuncts, 19 conjunts are in the unsatisfiable core [2020-07-21 16:57:42,391 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:57:42,912 INFO L134 CoverageAnalysis]: Checked inductivity of 13672 backedges. 1088 proven. 4777 refuted. 0 times theorem prover too weak. 7807 trivial. 0 not checked. [2020-07-21 16:57:42,913 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:57:43,743 INFO L134 CoverageAnalysis]: Checked inductivity of 13672 backedges. 627 proven. 4778 refuted. 0 times theorem prover too weak. 8267 trivial. 0 not checked. [2020-07-21 16:57:43,744 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1973334118] [2020-07-21 16:57:43,744 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:57:43,744 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20] total 32 [2020-07-21 16:57:43,744 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [629442318] [2020-07-21 16:57:43,745 INFO L459 AbstractCegarLoop]: Interpolant automaton has 32 states [2020-07-21 16:57:43,745 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:57:43,745 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2020-07-21 16:57:43,745 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=187, Invalid=805, Unknown=0, NotChecked=0, Total=992 [2020-07-21 16:57:43,745 INFO L87 Difference]: Start difference. First operand 348 states and 448 transitions. Second operand 32 states. [2020-07-21 16:57:50,398 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:57:50,398 INFO L93 Difference]: Finished difference Result 552 states and 727 transitions. [2020-07-21 16:57:50,399 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 106 states. [2020-07-21 16:57:50,399 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 489 [2020-07-21 16:57:50,400 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:57:50,402 INFO L225 Difference]: With dead ends: 552 [2020-07-21 16:57:50,402 INFO L226 Difference]: Without dead ends: 406 [2020-07-21 16:57:50,406 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1076 GetRequests, 941 SyntacticMatches, 6 SemanticMatches, 129 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6262 ImplicationChecksByTransitivity, 5.6s TimeCoverageRelationStatistics Valid=3560, Invalid=13470, Unknown=0, NotChecked=0, Total=17030 [2020-07-21 16:57:50,407 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 406 states. [2020-07-21 16:57:50,472 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 406 to 372. [2020-07-21 16:57:50,472 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 372 states. [2020-07-21 16:57:50,474 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 372 states to 372 states and 480 transitions. [2020-07-21 16:57:50,474 INFO L78 Accepts]: Start accepts. Automaton has 372 states and 480 transitions. Word has length 489 [2020-07-21 16:57:50,474 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:57:50,474 INFO L479 AbstractCegarLoop]: Abstraction has 372 states and 480 transitions. [2020-07-21 16:57:50,474 INFO L480 AbstractCegarLoop]: Interpolant automaton has 32 states. [2020-07-21 16:57:50,474 INFO L276 IsEmpty]: Start isEmpty. Operand 372 states and 480 transitions. [2020-07-21 16:57:50,478 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 535 [2020-07-21 16:57:50,479 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:57:50,479 INFO L422 BasicCegarLoop]: trace histogram [67, 67, 67, 66, 66, 66, 66, 14, 13, 13, 6, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:57:50,695 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:57:50,696 INFO L427 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:57:50,696 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:57:50,696 INFO L82 PathProgramCache]: Analyzing trace with hash 869445188, now seen corresponding path program 25 times [2020-07-21 16:57:50,696 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:57:50,696 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [148186236] [2020-07-21 16:57:50,696 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 29 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 29 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:57:50,863 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:57:50,864 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:57:50,866 INFO L263 TraceCheckSpWp]: Trace formula consists of 951 conjuncts, 17 conjunts are in the unsatisfiable core [2020-07-21 16:57:50,872 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:57:51,376 INFO L134 CoverageAnalysis]: Checked inductivity of 16502 backedges. 7531 proven. 1117 refuted. 0 times theorem prover too weak. 7854 trivial. 0 not checked. [2020-07-21 16:57:51,376 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:57:52,185 INFO L134 CoverageAnalysis]: Checked inductivity of 16502 backedges. 3921 proven. 2693 refuted. 0 times theorem prover too weak. 9888 trivial. 0 not checked. [2020-07-21 16:57:52,186 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [148186236] [2020-07-21 16:57:52,186 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:57:52,186 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18] total 29 [2020-07-21 16:57:52,186 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [178233048] [2020-07-21 16:57:52,187 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-07-21 16:57:52,187 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:57:52,187 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-07-21 16:57:52,187 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=184, Invalid=628, Unknown=0, NotChecked=0, Total=812 [2020-07-21 16:57:52,187 INFO L87 Difference]: Start difference. First operand 372 states and 480 transitions. Second operand 29 states. [2020-07-21 16:57:55,491 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:57:55,491 INFO L93 Difference]: Finished difference Result 505 states and 661 transitions. [2020-07-21 16:57:55,492 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 66 states. [2020-07-21 16:57:55,492 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 534 [2020-07-21 16:57:55,498 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:57:55,500 INFO L225 Difference]: With dead ends: 505 [2020-07-21 16:57:55,500 INFO L226 Difference]: Without dead ends: 372 [2020-07-21 16:57:55,502 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1130 GetRequests, 1040 SyntacticMatches, 5 SemanticMatches, 85 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1697 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=2104, Invalid=5378, Unknown=0, NotChecked=0, Total=7482 [2020-07-21 16:57:55,502 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 372 states. [2020-07-21 16:57:55,575 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 372 to 341. [2020-07-21 16:57:55,576 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 341 states. [2020-07-21 16:57:55,577 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 341 states to 341 states and 433 transitions. [2020-07-21 16:57:55,577 INFO L78 Accepts]: Start accepts. Automaton has 341 states and 433 transitions. Word has length 534 [2020-07-21 16:57:55,578 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:57:55,578 INFO L479 AbstractCegarLoop]: Abstraction has 341 states and 433 transitions. [2020-07-21 16:57:55,578 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-07-21 16:57:55,578 INFO L276 IsEmpty]: Start isEmpty. Operand 341 states and 433 transitions. [2020-07-21 16:57:55,583 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 542 [2020-07-21 16:57:55,583 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:57:55,584 INFO L422 BasicCegarLoop]: trace histogram [68, 68, 68, 67, 67, 67, 67, 14, 13, 13, 6, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:57:55,799 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 29 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:57:55,800 INFO L427 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:57:55,800 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:57:55,801 INFO L82 PathProgramCache]: Analyzing trace with hash 943892089, now seen corresponding path program 26 times [2020-07-21 16:57:55,801 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:57:55,801 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [324468131] [2020-07-21 16:57:55,802 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 30 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 30 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:57:55,950 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:57:55,950 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:57:55,954 INFO L263 TraceCheckSpWp]: Trace formula consists of 963 conjuncts, 21 conjunts are in the unsatisfiable core [2020-07-21 16:57:55,959 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:57:56,741 INFO L134 CoverageAnalysis]: Checked inductivity of 16981 backedges. 772 proven. 6374 refuted. 0 times theorem prover too weak. 9835 trivial. 0 not checked. [2020-07-21 16:57:56,742 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:57:57,694 INFO L134 CoverageAnalysis]: Checked inductivity of 16981 backedges. 509 proven. 6375 refuted. 0 times theorem prover too weak. 10097 trivial. 0 not checked. [2020-07-21 16:57:57,694 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [324468131] [2020-07-21 16:57:57,694 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:57:57,694 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22] total 36 [2020-07-21 16:57:57,695 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [962328986] [2020-07-21 16:57:57,695 INFO L459 AbstractCegarLoop]: Interpolant automaton has 36 states [2020-07-21 16:57:57,695 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:57:57,696 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2020-07-21 16:57:57,696 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=231, Invalid=1029, Unknown=0, NotChecked=0, Total=1260 [2020-07-21 16:57:57,696 INFO L87 Difference]: Start difference. First operand 341 states and 433 transitions. Second operand 36 states. [2020-07-21 16:58:06,288 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:58:06,288 INFO L93 Difference]: Finished difference Result 520 states and 674 transitions. [2020-07-21 16:58:06,289 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 115 states. [2020-07-21 16:58:06,289 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 541 [2020-07-21 16:58:06,290 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:58:06,291 INFO L225 Difference]: With dead ends: 520 [2020-07-21 16:58:06,292 INFO L226 Difference]: Without dead ends: 402 [2020-07-21 16:58:06,294 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1189 GetRequests, 1041 SyntacticMatches, 6 SemanticMatches, 142 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7485 ImplicationChecksByTransitivity, 7.2s TimeCoverageRelationStatistics Valid=4201, Invalid=16391, Unknown=0, NotChecked=0, Total=20592 [2020-07-21 16:58:06,295 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 402 states. [2020-07-21 16:58:06,399 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 402 to 368. [2020-07-21 16:58:06,399 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 368 states. [2020-07-21 16:58:06,401 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 368 states to 368 states and 469 transitions. [2020-07-21 16:58:06,401 INFO L78 Accepts]: Start accepts. Automaton has 368 states and 469 transitions. Word has length 541 [2020-07-21 16:58:06,402 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:58:06,402 INFO L479 AbstractCegarLoop]: Abstraction has 368 states and 469 transitions. [2020-07-21 16:58:06,402 INFO L480 AbstractCegarLoop]: Interpolant automaton has 36 states. [2020-07-21 16:58:06,402 INFO L276 IsEmpty]: Start isEmpty. Operand 368 states and 469 transitions. [2020-07-21 16:58:06,407 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 594 [2020-07-21 16:58:06,407 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:58:06,408 INFO L422 BasicCegarLoop]: trace histogram [75, 75, 75, 74, 74, 74, 74, 15, 14, 14, 6, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:58:06,616 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 30 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:58:06,616 INFO L427 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:58:06,616 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:58:06,617 INFO L82 PathProgramCache]: Analyzing trace with hash 1328811571, now seen corresponding path program 27 times [2020-07-21 16:58:06,617 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:58:06,617 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1705944900] [2020-07-21 16:58:06,618 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 31 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 31 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:58:06,775 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:58:06,776 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:58:06,779 INFO L263 TraceCheckSpWp]: Trace formula consists of 1053 conjuncts, 19 conjunts are in the unsatisfiable core [2020-07-21 16:58:06,785 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:58:07,464 INFO L134 CoverageAnalysis]: Checked inductivity of 20650 backedges. 9327 proven. 1463 refuted. 0 times theorem prover too weak. 9860 trivial. 0 not checked. [2020-07-21 16:58:07,465 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:58:08,501 INFO L134 CoverageAnalysis]: Checked inductivity of 20650 backedges. 4446 proven. 4022 refuted. 0 times theorem prover too weak. 12182 trivial. 0 not checked. [2020-07-21 16:58:08,502 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1705944900] [2020-07-21 16:58:08,502 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:58:08,503 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20] total 33 [2020-07-21 16:58:08,503 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2140170220] [2020-07-21 16:58:08,504 INFO L459 AbstractCegarLoop]: Interpolant automaton has 33 states [2020-07-21 16:58:08,504 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:58:08,504 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2020-07-21 16:58:08,504 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=233, Invalid=823, Unknown=0, NotChecked=0, Total=1056 [2020-07-21 16:58:08,505 INFO L87 Difference]: Start difference. First operand 368 states and 469 transitions. Second operand 33 states. [2020-07-21 16:58:13,151 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:58:13,152 INFO L93 Difference]: Finished difference Result 649 states and 846 transitions. [2020-07-21 16:58:13,153 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 84 states. [2020-07-21 16:58:13,153 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 593 [2020-07-21 16:58:13,153 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:58:13,155 INFO L225 Difference]: With dead ends: 649 [2020-07-21 16:58:13,156 INFO L226 Difference]: Without dead ends: 410 [2020-07-21 16:58:13,158 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1265 GetRequests, 1154 SyntacticMatches, 5 SemanticMatches, 106 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2783 ImplicationChecksByTransitivity, 3.8s TimeCoverageRelationStatistics Valid=3271, Invalid=8285, Unknown=0, NotChecked=0, Total=11556 [2020-07-21 16:58:13,159 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 410 states. [2020-07-21 16:58:13,227 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 410 to 402. [2020-07-21 16:58:13,227 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 402 states. [2020-07-21 16:58:13,229 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 402 states to 402 states and 516 transitions. [2020-07-21 16:58:13,229 INFO L78 Accepts]: Start accepts. Automaton has 402 states and 516 transitions. Word has length 593 [2020-07-21 16:58:13,229 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:58:13,230 INFO L479 AbstractCegarLoop]: Abstraction has 402 states and 516 transitions. [2020-07-21 16:58:13,230 INFO L480 AbstractCegarLoop]: Interpolant automaton has 33 states. [2020-07-21 16:58:13,230 INFO L276 IsEmpty]: Start isEmpty. Operand 402 states and 516 transitions. [2020-07-21 16:58:13,235 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 601 [2020-07-21 16:58:13,235 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:58:13,236 INFO L422 BasicCegarLoop]: trace histogram [76, 76, 76, 75, 75, 75, 75, 15, 14, 14, 6, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:58:13,449 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 31 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:58:13,450 INFO L427 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:58:13,450 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:58:13,451 INFO L82 PathProgramCache]: Analyzing trace with hash 1218530218, now seen corresponding path program 28 times [2020-07-21 16:58:13,451 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:58:13,451 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1072050316] [2020-07-21 16:58:13,452 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 32 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 32 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:58:13,642 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:58:13,642 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:58:13,646 INFO L263 TraceCheckSpWp]: Trace formula consists of 1065 conjuncts, 23 conjunts are in the unsatisfiable core [2020-07-21 16:58:13,651 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:58:14,458 INFO L134 CoverageAnalysis]: Checked inductivity of 21186 backedges. 348 proven. 8394 refuted. 0 times theorem prover too weak. 12444 trivial. 0 not checked. [2020-07-21 16:58:14,458 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:58:15,725 INFO L134 CoverageAnalysis]: Checked inductivity of 21186 backedges. 347 proven. 8395 refuted. 0 times theorem prover too weak. 12444 trivial. 0 not checked. [2020-07-21 16:58:15,725 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1072050316] [2020-07-21 16:58:15,725 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:58:15,725 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24] total 40 [2020-07-21 16:58:15,726 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2054853986] [2020-07-21 16:58:15,726 INFO L459 AbstractCegarLoop]: Interpolant automaton has 40 states [2020-07-21 16:58:15,726 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:58:15,727 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2020-07-21 16:58:15,727 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=281, Invalid=1279, Unknown=0, NotChecked=0, Total=1560 [2020-07-21 16:58:15,727 INFO L87 Difference]: Start difference. First operand 402 states and 516 transitions. Second operand 40 states. [2020-07-21 16:58:26,629 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:58:26,629 INFO L93 Difference]: Finished difference Result 702 states and 919 transitions. [2020-07-21 16:58:26,630 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 130 states. [2020-07-21 16:58:26,631 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 600 [2020-07-21 16:58:26,631 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:58:26,634 INFO L225 Difference]: With dead ends: 702 [2020-07-21 16:58:26,634 INFO L226 Difference]: Without dead ends: 527 [2020-07-21 16:58:26,638 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1322 GetRequests, 1155 SyntacticMatches, 6 SemanticMatches, 161 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9714 ImplicationChecksByTransitivity, 9.3s TimeCoverageRelationStatistics Valid=5642, Invalid=20764, Unknown=0, NotChecked=0, Total=26406 [2020-07-21 16:58:26,640 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 527 states. [2020-07-21 16:58:26,746 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 527 to 434. [2020-07-21 16:58:26,747 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 434 states. [2020-07-21 16:58:26,749 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 434 states to 434 states and 560 transitions. [2020-07-21 16:58:26,749 INFO L78 Accepts]: Start accepts. Automaton has 434 states and 560 transitions. Word has length 600 [2020-07-21 16:58:26,750 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:58:26,750 INFO L479 AbstractCegarLoop]: Abstraction has 434 states and 560 transitions. [2020-07-21 16:58:26,750 INFO L480 AbstractCegarLoop]: Interpolant automaton has 40 states. [2020-07-21 16:58:26,750 INFO L276 IsEmpty]: Start isEmpty. Operand 434 states and 560 transitions. [2020-07-21 16:58:26,756 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 663 [2020-07-21 16:58:26,756 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:58:26,757 INFO L422 BasicCegarLoop]: trace histogram [84, 84, 84, 83, 83, 83, 83, 16, 15, 15, 7, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:58:26,971 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 32 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:58:26,972 INFO L427 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:58:26,972 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:58:26,973 INFO L82 PathProgramCache]: Analyzing trace with hash -955730672, now seen corresponding path program 29 times [2020-07-21 16:58:26,973 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:58:26,973 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1684786253] [2020-07-21 16:58:26,973 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 33 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 33 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:58:27,158 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:58:27,158 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:58:27,162 INFO L263 TraceCheckSpWp]: Trace formula consists of 1173 conjuncts, 21 conjunts are in the unsatisfiable core [2020-07-21 16:58:27,169 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:58:28,682 INFO L134 CoverageAnalysis]: Checked inductivity of 25890 backedges. 11572 proven. 1881 refuted. 0 times theorem prover too weak. 12437 trivial. 0 not checked. [2020-07-21 16:58:28,683 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:58:30,051 INFO L134 CoverageAnalysis]: Checked inductivity of 25890 backedges. 5254 proven. 5553 refuted. 0 times theorem prover too weak. 15083 trivial. 0 not checked. [2020-07-21 16:58:30,052 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1684786253] [2020-07-21 16:58:30,052 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:58:30,052 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22] total 37 [2020-07-21 16:58:30,052 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2016316628] [2020-07-21 16:58:30,053 INFO L459 AbstractCegarLoop]: Interpolant automaton has 37 states [2020-07-21 16:58:30,053 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:58:30,053 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2020-07-21 16:58:30,053 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=288, Invalid=1044, Unknown=0, NotChecked=0, Total=1332 [2020-07-21 16:58:30,054 INFO L87 Difference]: Start difference. First operand 434 states and 560 transitions. Second operand 37 states. [2020-07-21 16:58:35,859 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:58:35,860 INFO L93 Difference]: Finished difference Result 642 states and 845 transitions. [2020-07-21 16:58:35,861 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 86 states. [2020-07-21 16:58:35,862 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 662 [2020-07-21 16:58:35,863 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:58:35,866 INFO L225 Difference]: With dead ends: 642 [2020-07-21 16:58:35,866 INFO L226 Difference]: Without dead ends: 476 [2020-07-21 16:58:35,870 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1404 GetRequests, 1288 SyntacticMatches, 5 SemanticMatches, 111 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3033 ImplicationChecksByTransitivity, 4.6s TimeCoverageRelationStatistics Valid=3542, Invalid=9114, Unknown=0, NotChecked=0, Total=12656 [2020-07-21 16:58:35,871 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 476 states. [2020-07-21 16:58:35,961 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 476 to 468. [2020-07-21 16:58:35,962 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 468 states. [2020-07-21 16:58:35,964 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 468 states to 468 states and 607 transitions. [2020-07-21 16:58:35,965 INFO L78 Accepts]: Start accepts. Automaton has 468 states and 607 transitions. Word has length 662 [2020-07-21 16:58:35,965 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:58:35,965 INFO L479 AbstractCegarLoop]: Abstraction has 468 states and 607 transitions. [2020-07-21 16:58:35,965 INFO L480 AbstractCegarLoop]: Interpolant automaton has 37 states. [2020-07-21 16:58:35,965 INFO L276 IsEmpty]: Start isEmpty. Operand 468 states and 607 transitions. [2020-07-21 16:58:35,969 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 670 [2020-07-21 16:58:35,969 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:58:35,970 INFO L422 BasicCegarLoop]: trace histogram [85, 85, 85, 84, 84, 84, 84, 16, 15, 15, 7, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:58:36,170 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 33 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:58:36,171 INFO L427 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:58:36,171 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:58:36,172 INFO L82 PathProgramCache]: Analyzing trace with hash 2116259269, now seen corresponding path program 30 times [2020-07-21 16:58:36,172 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:58:36,173 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [28141380] [2020-07-21 16:58:36,173 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 34 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 34 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:58:36,371 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:58:36,371 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:58:36,376 INFO L263 TraceCheckSpWp]: Trace formula consists of 1185 conjuncts, 17 conjunts are in the unsatisfiable core [2020-07-21 16:58:36,382 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:58:37,023 INFO L134 CoverageAnalysis]: Checked inductivity of 26490 backedges. 2050 proven. 8359 refuted. 0 times theorem prover too weak. 16081 trivial. 0 not checked. [2020-07-21 16:58:37,023 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:58:38,057 INFO L134 CoverageAnalysis]: Checked inductivity of 26490 backedges. 1083 proven. 8360 refuted. 0 times theorem prover too weak. 17047 trivial. 0 not checked. [2020-07-21 16:58:38,057 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [28141380] [2020-07-21 16:58:38,057 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:58:38,057 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18] total 27 [2020-07-21 16:58:38,058 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [931835424] [2020-07-21 16:58:38,058 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-07-21 16:58:38,058 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:58:38,058 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-07-21 16:58:38,059 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=148, Invalid=554, Unknown=0, NotChecked=0, Total=702 [2020-07-21 16:58:38,059 INFO L87 Difference]: Start difference. First operand 468 states and 607 transitions. Second operand 27 states. [2020-07-21 16:58:43,091 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:58:43,091 INFO L93 Difference]: Finished difference Result 1029 states and 1363 transitions. [2020-07-21 16:58:43,093 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 84 states. [2020-07-21 16:58:43,093 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 669 [2020-07-21 16:58:43,094 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:58:43,097 INFO L225 Difference]: With dead ends: 1029 [2020-07-21 16:58:43,097 INFO L226 Difference]: Without dead ends: 859 [2020-07-21 16:58:43,100 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1414 GetRequests, 1305 SyntacticMatches, 7 SemanticMatches, 102 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3938 ImplicationChecksByTransitivity, 4.1s TimeCoverageRelationStatistics Valid=2225, Invalid=8487, Unknown=0, NotChecked=0, Total=10712 [2020-07-21 16:58:43,101 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 859 states. [2020-07-21 16:58:43,218 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 859 to 613. [2020-07-21 16:58:43,218 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 613 states. [2020-07-21 16:58:43,220 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 613 states to 613 states and 796 transitions. [2020-07-21 16:58:43,220 INFO L78 Accepts]: Start accepts. Automaton has 613 states and 796 transitions. Word has length 669 [2020-07-21 16:58:43,221 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:58:43,221 INFO L479 AbstractCegarLoop]: Abstraction has 613 states and 796 transitions. [2020-07-21 16:58:43,221 INFO L480 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-07-21 16:58:43,221 INFO L276 IsEmpty]: Start isEmpty. Operand 613 states and 796 transitions. [2020-07-21 16:58:43,226 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 708 [2020-07-21 16:58:43,226 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:58:43,227 INFO L422 BasicCegarLoop]: trace histogram [90, 90, 90, 89, 89, 89, 89, 17, 16, 16, 7, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:58:43,427 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 34 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:58:43,428 INFO L427 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:58:43,428 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:58:43,429 INFO L82 PathProgramCache]: Analyzing trace with hash -1360123809, now seen corresponding path program 31 times [2020-07-21 16:58:43,429 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:58:43,429 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1217121138] [2020-07-21 16:58:43,429 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 35 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 35 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:58:43,629 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:58:43,629 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:58:43,633 INFO L263 TraceCheckSpWp]: Trace formula consists of 1251 conjuncts, 15 conjunts are in the unsatisfiable core [2020-07-21 16:58:43,639 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:58:44,203 INFO L134 CoverageAnalysis]: Checked inductivity of 29737 backedges. 12374 proven. 1344 refuted. 0 times theorem prover too weak. 16019 trivial. 0 not checked. [2020-07-21 16:58:44,203 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:58:45,338 INFO L134 CoverageAnalysis]: Checked inductivity of 29737 backedges. 9512 proven. 1344 refuted. 0 times theorem prover too weak. 18881 trivial. 0 not checked. [2020-07-21 16:58:45,338 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1217121138] [2020-07-21 16:58:45,338 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:58:45,339 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16] total 24 [2020-07-21 16:58:45,339 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [702928311] [2020-07-21 16:58:45,340 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-07-21 16:58:45,340 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:58:45,340 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-07-21 16:58:45,340 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=134, Invalid=418, Unknown=0, NotChecked=0, Total=552 [2020-07-21 16:58:45,340 INFO L87 Difference]: Start difference. First operand 613 states and 796 transitions. Second operand 24 states. [2020-07-21 16:58:47,560 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:58:47,560 INFO L93 Difference]: Finished difference Result 802 states and 1052 transitions. [2020-07-21 16:58:47,561 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2020-07-21 16:58:47,561 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 707 [2020-07-21 16:58:47,562 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:58:47,564 INFO L225 Difference]: With dead ends: 802 [2020-07-21 16:58:47,564 INFO L226 Difference]: Without dead ends: 490 [2020-07-21 16:58:47,566 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1455 GetRequests, 1391 SyntacticMatches, 6 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 684 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=1039, Invalid=2501, Unknown=0, NotChecked=0, Total=3540 [2020-07-21 16:58:47,567 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 490 states. [2020-07-21 16:58:47,682 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 490 to 490. [2020-07-21 16:58:47,682 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 490 states. [2020-07-21 16:58:47,684 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 490 states to 490 states and 633 transitions. [2020-07-21 16:58:47,685 INFO L78 Accepts]: Start accepts. Automaton has 490 states and 633 transitions. Word has length 707 [2020-07-21 16:58:47,685 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:58:47,685 INFO L479 AbstractCegarLoop]: Abstraction has 490 states and 633 transitions. [2020-07-21 16:58:47,686 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-07-21 16:58:47,686 INFO L276 IsEmpty]: Start isEmpty. Operand 490 states and 633 transitions. [2020-07-21 16:58:47,692 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 715 [2020-07-21 16:58:47,692 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:58:47,693 INFO L422 BasicCegarLoop]: trace histogram [91, 91, 91, 90, 90, 90, 90, 17, 16, 16, 7, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:58:47,906 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 35 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:58:47,907 INFO L427 AbstractCegarLoop]: === Iteration 35 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:58:47,907 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:58:47,908 INFO L82 PathProgramCache]: Analyzing trace with hash 1558816766, now seen corresponding path program 32 times [2020-07-21 16:58:47,908 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:58:47,908 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2048520996] [2020-07-21 16:58:47,908 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 36 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 36 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:58:48,107 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:58:48,107 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:58:48,111 INFO L263 TraceCheckSpWp]: Trace formula consists of 1263 conjuncts, 19 conjunts are in the unsatisfiable core [2020-07-21 16:58:48,118 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:58:48,886 INFO L134 CoverageAnalysis]: Checked inductivity of 30380 backedges. 1607 proven. 10306 refuted. 0 times theorem prover too weak. 18467 trivial. 0 not checked. [2020-07-21 16:58:48,886 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:58:50,290 INFO L134 CoverageAnalysis]: Checked inductivity of 30380 backedges. 906 proven. 10307 refuted. 0 times theorem prover too weak. 19167 trivial. 0 not checked. [2020-07-21 16:58:50,291 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2048520996] [2020-07-21 16:58:50,291 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:58:50,291 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20] total 31 [2020-07-21 16:58:50,291 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1780053817] [2020-07-21 16:58:50,292 INFO L459 AbstractCegarLoop]: Interpolant automaton has 31 states [2020-07-21 16:58:50,292 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:58:50,293 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2020-07-21 16:58:50,293 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=183, Invalid=747, Unknown=0, NotChecked=0, Total=930 [2020-07-21 16:58:50,293 INFO L87 Difference]: Start difference. First operand 490 states and 633 transitions. Second operand 31 states. [2020-07-21 16:59:00,712 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:59:00,713 INFO L93 Difference]: Finished difference Result 785 states and 1037 transitions. [2020-07-21 16:59:00,714 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 126 states. [2020-07-21 16:59:00,714 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 714 [2020-07-21 16:59:00,715 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:59:00,718 INFO L225 Difference]: With dead ends: 785 [2020-07-21 16:59:00,718 INFO L226 Difference]: Without dead ends: 605 [2020-07-21 16:59:00,720 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1546 GetRequests, 1391 SyntacticMatches, 7 SemanticMatches, 148 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8958 ImplicationChecksByTransitivity, 8.3s TimeCoverageRelationStatistics Valid=4408, Invalid=17942, Unknown=0, NotChecked=0, Total=22350 [2020-07-21 16:59:00,720 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 605 states. [2020-07-21 16:59:00,810 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 605 to 514. [2020-07-21 16:59:00,810 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 514 states. [2020-07-21 16:59:00,812 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 514 states to 514 states and 665 transitions. [2020-07-21 16:59:00,812 INFO L78 Accepts]: Start accepts. Automaton has 514 states and 665 transitions. Word has length 714 [2020-07-21 16:59:00,813 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:59:00,813 INFO L479 AbstractCegarLoop]: Abstraction has 514 states and 665 transitions. [2020-07-21 16:59:00,813 INFO L480 AbstractCegarLoop]: Interpolant automaton has 31 states. [2020-07-21 16:59:00,814 INFO L276 IsEmpty]: Start isEmpty. Operand 514 states and 665 transitions. [2020-07-21 16:59:00,820 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 760 [2020-07-21 16:59:00,820 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:59:00,821 INFO L422 BasicCegarLoop]: trace histogram [97, 97, 97, 96, 96, 96, 96, 18, 17, 17, 7, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:59:01,032 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 36 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:59:01,033 INFO L427 AbstractCegarLoop]: === Iteration 36 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:59:01,033 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:59:01,034 INFO L82 PathProgramCache]: Analyzing trace with hash 937711205, now seen corresponding path program 33 times [2020-07-21 16:59:01,034 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:59:01,034 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1748711504] [2020-07-21 16:59:01,035 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 37 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 37 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:59:01,247 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:59:01,247 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:59:01,254 INFO L263 TraceCheckSpWp]: Trace formula consists of 1341 conjuncts, 17 conjunts are in the unsatisfiable core [2020-07-21 16:59:01,261 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:59:02,187 INFO L134 CoverageAnalysis]: Checked inductivity of 34537 backedges. 14422 proven. 1721 refuted. 0 times theorem prover too weak. 18394 trivial. 0 not checked. [2020-07-21 16:59:02,187 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:59:03,578 INFO L134 CoverageAnalysis]: Checked inductivity of 34537 backedges. 9744 proven. 3285 refuted. 0 times theorem prover too weak. 21508 trivial. 0 not checked. [2020-07-21 16:59:03,579 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1748711504] [2020-07-21 16:59:03,579 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:59:03,580 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18] total 28 [2020-07-21 16:59:03,580 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1461640612] [2020-07-21 16:59:03,581 INFO L459 AbstractCegarLoop]: Interpolant automaton has 28 states [2020-07-21 16:59:03,581 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:59:03,582 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2020-07-21 16:59:03,582 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=175, Invalid=581, Unknown=0, NotChecked=0, Total=756 [2020-07-21 16:59:03,582 INFO L87 Difference]: Start difference. First operand 514 states and 665 transitions. Second operand 28 states. [2020-07-21 16:59:07,447 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:59:07,447 INFO L93 Difference]: Finished difference Result 684 states and 896 transitions. [2020-07-21 16:59:07,449 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 61 states. [2020-07-21 16:59:07,449 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 759 [2020-07-21 16:59:07,450 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:59:07,452 INFO L225 Difference]: With dead ends: 684 [2020-07-21 16:59:07,452 INFO L226 Difference]: Without dead ends: 514 [2020-07-21 16:59:07,454 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1576 GetRequests, 1491 SyntacticMatches, 6 SemanticMatches, 79 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1396 ImplicationChecksByTransitivity, 3.3s TimeCoverageRelationStatistics Valid=1853, Invalid=4627, Unknown=0, NotChecked=0, Total=6480 [2020-07-21 16:59:07,455 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 514 states. [2020-07-21 16:59:07,543 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 514 to 514. [2020-07-21 16:59:07,543 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 514 states. [2020-07-21 16:59:07,545 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 514 states to 514 states and 663 transitions. [2020-07-21 16:59:07,546 INFO L78 Accepts]: Start accepts. Automaton has 514 states and 663 transitions. Word has length 759 [2020-07-21 16:59:07,546 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:59:07,546 INFO L479 AbstractCegarLoop]: Abstraction has 514 states and 663 transitions. [2020-07-21 16:59:07,546 INFO L480 AbstractCegarLoop]: Interpolant automaton has 28 states. [2020-07-21 16:59:07,546 INFO L276 IsEmpty]: Start isEmpty. Operand 514 states and 663 transitions. [2020-07-21 16:59:07,552 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 767 [2020-07-21 16:59:07,552 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:59:07,552 INFO L422 BasicCegarLoop]: trace histogram [98, 98, 98, 97, 97, 97, 97, 18, 17, 17, 7, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:59:07,753 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 37 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:59:07,753 INFO L427 AbstractCegarLoop]: === Iteration 37 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:59:07,754 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:59:07,754 INFO L82 PathProgramCache]: Analyzing trace with hash -661993672, now seen corresponding path program 34 times [2020-07-21 16:59:07,755 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:59:07,755 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [817260703] [2020-07-21 16:59:07,756 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 38 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 38 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:59:07,967 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:59:07,968 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:59:07,972 INFO L263 TraceCheckSpWp]: Trace formula consists of 1353 conjuncts, 21 conjunts are in the unsatisfiable core [2020-07-21 16:59:07,979 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:59:08,985 INFO L134 CoverageAnalysis]: Checked inductivity of 35230 backedges. 1077 proven. 12698 refuted. 0 times theorem prover too weak. 21455 trivial. 0 not checked. [2020-07-21 16:59:08,985 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:59:10,619 INFO L134 CoverageAnalysis]: Checked inductivity of 35230 backedges. 694 proven. 12699 refuted. 0 times theorem prover too weak. 21837 trivial. 0 not checked. [2020-07-21 16:59:10,620 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [817260703] [2020-07-21 16:59:10,620 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:59:10,620 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22] total 35 [2020-07-21 16:59:10,620 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [428639652] [2020-07-21 16:59:10,621 INFO L459 AbstractCegarLoop]: Interpolant automaton has 35 states [2020-07-21 16:59:10,621 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:59:10,621 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2020-07-21 16:59:10,622 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=224, Invalid=966, Unknown=0, NotChecked=0, Total=1190 [2020-07-21 16:59:10,622 INFO L87 Difference]: Start difference. First operand 514 states and 663 transitions. Second operand 35 states. [2020-07-21 16:59:25,295 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:59:25,295 INFO L93 Difference]: Finished difference Result 784 states and 1029 transitions. [2020-07-21 16:59:25,297 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 147 states. [2020-07-21 16:59:25,297 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 766 [2020-07-21 16:59:25,298 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:59:25,301 INFO L225 Difference]: With dead ends: 784 [2020-07-21 16:59:25,301 INFO L226 Difference]: Without dead ends: 601 [2020-07-21 16:59:25,305 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1671 GetRequests, 1491 SyntacticMatches, 7 SemanticMatches, 173 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12320 ImplicationChecksByTransitivity, 12.4s TimeCoverageRelationStatistics Valid=5987, Invalid=24463, Unknown=0, NotChecked=0, Total=30450 [2020-07-21 16:59:25,306 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 601 states. [2020-07-21 16:59:25,446 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 601 to 541. [2020-07-21 16:59:25,446 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 541 states. [2020-07-21 16:59:25,447 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 541 states to 541 states and 699 transitions. [2020-07-21 16:59:25,448 INFO L78 Accepts]: Start accepts. Automaton has 541 states and 699 transitions. Word has length 766 [2020-07-21 16:59:25,448 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:59:25,449 INFO L479 AbstractCegarLoop]: Abstraction has 541 states and 699 transitions. [2020-07-21 16:59:25,449 INFO L480 AbstractCegarLoop]: Interpolant automaton has 35 states. [2020-07-21 16:59:25,449 INFO L276 IsEmpty]: Start isEmpty. Operand 541 states and 699 transitions. [2020-07-21 16:59:25,454 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 819 [2020-07-21 16:59:25,455 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:59:25,455 INFO L422 BasicCegarLoop]: trace histogram [105, 105, 105, 104, 104, 104, 104, 19, 18, 18, 7, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:59:25,655 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 38 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:59:25,656 INFO L427 AbstractCegarLoop]: === Iteration 38 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:59:25,656 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:59:25,657 INFO L82 PathProgramCache]: Analyzing trace with hash -1871274638, now seen corresponding path program 35 times [2020-07-21 16:59:25,657 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:59:25,658 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1352202788] [2020-07-21 16:59:25,658 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 39 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 39 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:59:25,881 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:59:25,882 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:59:25,887 INFO L263 TraceCheckSpWp]: Trace formula consists of 1443 conjuncts, 19 conjunts are in the unsatisfiable core [2020-07-21 16:59:25,894 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:59:26,886 INFO L134 CoverageAnalysis]: Checked inductivity of 40440 backedges. 16919 proven. 2161 refuted. 0 times theorem prover too weak. 21360 trivial. 0 not checked. [2020-07-21 16:59:26,887 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:59:28,794 INFO L134 CoverageAnalysis]: Checked inductivity of 40440 backedges. 10149 proven. 5529 refuted. 0 times theorem prover too weak. 24762 trivial. 0 not checked. [2020-07-21 16:59:28,794 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1352202788] [2020-07-21 16:59:28,794 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:59:28,795 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20] total 32 [2020-07-21 16:59:28,795 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1885478661] [2020-07-21 16:59:28,796 INFO L459 AbstractCegarLoop]: Interpolant automaton has 32 states [2020-07-21 16:59:28,796 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:59:28,796 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2020-07-21 16:59:28,797 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=222, Invalid=770, Unknown=0, NotChecked=0, Total=992 [2020-07-21 16:59:28,797 INFO L87 Difference]: Start difference. First operand 541 states and 699 transitions. Second operand 32 states. [2020-07-21 16:59:37,441 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:59:37,441 INFO L93 Difference]: Finished difference Result 711 states and 929 transitions. [2020-07-21 16:59:37,444 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 80 states. [2020-07-21 16:59:37,444 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 818 [2020-07-21 16:59:37,445 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:59:37,448 INFO L225 Difference]: With dead ends: 711 [2020-07-21 16:59:37,449 INFO L226 Difference]: Without dead ends: 541 [2020-07-21 16:59:37,452 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1712 GetRequests, 1605 SyntacticMatches, 6 SemanticMatches, 101 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2503 ImplicationChecksByTransitivity, 6.2s TimeCoverageRelationStatistics Valid=2931, Invalid=7575, Unknown=0, NotChecked=0, Total=10506 [2020-07-21 16:59:37,453 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 541 states. [2020-07-21 16:59:37,621 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 541 to 541. [2020-07-21 16:59:37,621 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 541 states. [2020-07-21 16:59:37,623 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 541 states to 541 states and 697 transitions. [2020-07-21 16:59:37,623 INFO L78 Accepts]: Start accepts. Automaton has 541 states and 697 transitions. Word has length 818 [2020-07-21 16:59:37,624 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:59:37,625 INFO L479 AbstractCegarLoop]: Abstraction has 541 states and 697 transitions. [2020-07-21 16:59:37,625 INFO L480 AbstractCegarLoop]: Interpolant automaton has 32 states. [2020-07-21 16:59:37,625 INFO L276 IsEmpty]: Start isEmpty. Operand 541 states and 697 transitions. [2020-07-21 16:59:37,634 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 826 [2020-07-21 16:59:37,634 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:59:37,635 INFO L422 BasicCegarLoop]: trace histogram [106, 106, 106, 105, 105, 105, 105, 19, 18, 18, 7, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:59:37,849 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 39 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:59:37,850 INFO L427 AbstractCegarLoop]: === Iteration 39 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:59:37,850 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:59:37,851 INFO L82 PathProgramCache]: Analyzing trace with hash -778442869, now seen corresponding path program 36 times [2020-07-21 16:59:37,851 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:59:37,851 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [776637871] [2020-07-21 16:59:37,852 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 40 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 40 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:59:38,061 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:59:38,062 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:59:38,066 INFO L263 TraceCheckSpWp]: Trace formula consists of 1455 conjuncts, 23 conjunts are in the unsatisfiable core [2020-07-21 16:59:38,072 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:59:39,180 INFO L134 CoverageAnalysis]: Checked inductivity of 41190 backedges. 439 proven. 15607 refuted. 0 times theorem prover too weak. 25144 trivial. 0 not checked. [2020-07-21 16:59:39,180 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:59:41,358 INFO L134 CoverageAnalysis]: Checked inductivity of 41190 backedges. 438 proven. 15608 refuted. 0 times theorem prover too weak. 25144 trivial. 0 not checked. [2020-07-21 16:59:41,358 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [776637871] [2020-07-21 16:59:41,358 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:59:41,359 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24] total 39 [2020-07-21 16:59:41,359 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [933302272] [2020-07-21 16:59:41,360 INFO L459 AbstractCegarLoop]: Interpolant automaton has 39 states [2020-07-21 16:59:41,360 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:59:41,360 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2020-07-21 16:59:41,360 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=271, Invalid=1211, Unknown=0, NotChecked=0, Total=1482 [2020-07-21 16:59:41,360 INFO L87 Difference]: Start difference. First operand 541 states and 697 transitions. Second operand 39 states. [2020-07-21 17:00:02,717 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 17:00:02,717 INFO L93 Difference]: Finished difference Result 791 states and 1034 transitions. [2020-07-21 17:00:02,719 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 165 states. [2020-07-21 17:00:02,719 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 825 [2020-07-21 17:00:02,720 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 17:00:02,724 INFO L225 Difference]: With dead ends: 791 [2020-07-21 17:00:02,724 INFO L226 Difference]: Without dead ends: 605 [2020-07-21 17:00:02,728 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1807 GetRequests, 1605 SyntacticMatches, 7 SemanticMatches, 195 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15667 ImplicationChecksByTransitivity, 17.7s TimeCoverageRelationStatistics Valid=7390, Invalid=31222, Unknown=0, NotChecked=0, Total=38612 [2020-07-21 17:00:02,729 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 605 states. [2020-07-21 17:00:02,842 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 605 to 571. [2020-07-21 17:00:02,842 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 571 states. [2020-07-21 17:00:02,844 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 571 states to 571 states and 737 transitions. [2020-07-21 17:00:02,844 INFO L78 Accepts]: Start accepts. Automaton has 571 states and 737 transitions. Word has length 825 [2020-07-21 17:00:02,844 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 17:00:02,845 INFO L479 AbstractCegarLoop]: Abstraction has 571 states and 737 transitions. [2020-07-21 17:00:02,845 INFO L480 AbstractCegarLoop]: Interpolant automaton has 39 states. [2020-07-21 17:00:02,845 INFO L276 IsEmpty]: Start isEmpty. Operand 571 states and 737 transitions. [2020-07-21 17:00:02,851 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 885 [2020-07-21 17:00:02,851 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 17:00:02,851 INFO L422 BasicCegarLoop]: trace histogram [114, 114, 114, 113, 113, 113, 113, 20, 19, 19, 7, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 17:00:03,057 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 40 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 17:00:03,058 INFO L427 AbstractCegarLoop]: === Iteration 40 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 17:00:03,058 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 17:00:03,059 INFO L82 PathProgramCache]: Analyzing trace with hash -1882081448, now seen corresponding path program 37 times [2020-07-21 17:00:03,059 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 17:00:03,059 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2081653179] [2020-07-21 17:00:03,060 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 41 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 41 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 17:00:03,288 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 17:00:03,288 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 17:00:03,294 INFO L263 TraceCheckSpWp]: Trace formula consists of 1557 conjuncts, 21 conjunts are in the unsatisfiable core [2020-07-21 17:00:03,300 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 17:00:04,573 INFO L134 CoverageAnalysis]: Checked inductivity of 47617 backedges. 19928 proven. 2673 refuted. 0 times theorem prover too weak. 25016 trivial. 0 not checked. [2020-07-21 17:00:04,574 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 17:00:06,864 INFO L134 CoverageAnalysis]: Checked inductivity of 47617 backedges. 10790 proven. 8085 refuted. 0 times theorem prover too weak. 28742 trivial. 0 not checked. [2020-07-21 17:00:06,865 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2081653179] [2020-07-21 17:00:06,865 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 17:00:06,866 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22] total 36 [2020-07-21 17:00:06,866 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [206758022] [2020-07-21 17:00:06,867 INFO L459 AbstractCegarLoop]: Interpolant automaton has 36 states [2020-07-21 17:00:06,867 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 17:00:06,868 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2020-07-21 17:00:06,868 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=275, Invalid=985, Unknown=0, NotChecked=0, Total=1260 [2020-07-21 17:00:06,868 INFO L87 Difference]: Start difference. First operand 571 states and 737 transitions. Second operand 36 states. [2020-07-21 17:00:15,280 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 17:00:15,280 INFO L93 Difference]: Finished difference Result 742 states and 967 transitions. [2020-07-21 17:00:15,282 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 100 states. [2020-07-21 17:00:15,282 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 884 [2020-07-21 17:00:15,283 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 17:00:15,286 INFO L225 Difference]: With dead ends: 742 [2020-07-21 17:00:15,286 INFO L226 Difference]: Without dead ends: 572 [2020-07-21 17:00:15,288 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1863 GetRequests, 1733 SyntacticMatches, 6 SemanticMatches, 124 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3978 ImplicationChecksByTransitivity, 7.0s TimeCoverageRelationStatistics Valid=4351, Invalid=11399, Unknown=0, NotChecked=0, Total=15750 [2020-07-21 17:00:15,289 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 572 states. [2020-07-21 17:00:15,378 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 572 to 540. [2020-07-21 17:00:15,378 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 540 states. [2020-07-21 17:00:15,379 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 540 states to 540 states and 692 transitions. [2020-07-21 17:00:15,380 INFO L78 Accepts]: Start accepts. Automaton has 540 states and 692 transitions. Word has length 884 [2020-07-21 17:00:15,380 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 17:00:15,380 INFO L479 AbstractCegarLoop]: Abstraction has 540 states and 692 transitions. [2020-07-21 17:00:15,380 INFO L480 AbstractCegarLoop]: Interpolant automaton has 36 states. [2020-07-21 17:00:15,380 INFO L276 IsEmpty]: Start isEmpty. Operand 540 states and 692 transitions. [2020-07-21 17:00:15,386 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 892 [2020-07-21 17:00:15,387 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 17:00:15,387 INFO L422 BasicCegarLoop]: trace histogram [115, 115, 115, 114, 114, 114, 114, 20, 19, 19, 7, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 17:00:15,587 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 41 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 17:00:15,588 INFO L427 AbstractCegarLoop]: === Iteration 41 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 17:00:15,588 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 17:00:15,589 INFO L82 PathProgramCache]: Analyzing trace with hash 932118245, now seen corresponding path program 38 times [2020-07-21 17:00:15,589 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 17:00:15,589 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1712907270] [2020-07-21 17:00:15,590 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 42 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 42 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 17:00:15,832 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 17:00:15,832 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 17:00:15,838 INFO L263 TraceCheckSpWp]: Trace formula consists of 1569 conjuncts, 21 conjunts are in the unsatisfiable core [2020-07-21 17:00:15,846 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 17:00:16,614 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 17:00:16,615 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 17:00:17,137 INFO L134 CoverageAnalysis]: Checked inductivity of 48431 backedges. 17979 proven. 150 refuted. 0 times theorem prover too weak. 30302 trivial. 0 not checked. [2020-07-21 17:00:17,138 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 17:00:17,176 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 17:00:19,628 INFO L134 CoverageAnalysis]: Checked inductivity of 48431 backedges. 7048 proven. 11081 refuted. 0 times theorem prover too weak. 30302 trivial. 0 not checked. [2020-07-21 17:00:19,629 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1712907270] [2020-07-21 17:00:19,629 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 17:00:19,629 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22] total 36 [2020-07-21 17:00:19,629 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [31224605] [2020-07-21 17:00:19,636 INFO L459 AbstractCegarLoop]: Interpolant automaton has 36 states [2020-07-21 17:00:19,636 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 17:00:19,636 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2020-07-21 17:00:19,637 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=406, Invalid=854, Unknown=0, NotChecked=0, Total=1260 [2020-07-21 17:00:19,637 INFO L87 Difference]: Start difference. First operand 540 states and 692 transitions. Second operand 36 states. [2020-07-21 17:00:24,315 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 17:00:24,316 INFO L93 Difference]: Finished difference Result 690 states and 898 transitions. [2020-07-21 17:00:24,319 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 64 states. [2020-07-21 17:00:24,319 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 891 [2020-07-21 17:00:24,320 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 17:00:24,323 INFO L225 Difference]: With dead ends: 690 [2020-07-21 17:00:24,323 INFO L226 Difference]: Without dead ends: 688 [2020-07-21 17:00:24,324 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1853 GetRequests, 1757 SyntacticMatches, 6 SemanticMatches, 90 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2506 ImplicationChecksByTransitivity, 4.1s TimeCoverageRelationStatistics Valid=2537, Invalid=5835, Unknown=0, NotChecked=0, Total=8372 [2020-07-21 17:00:24,325 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 688 states. [2020-07-21 17:00:24,428 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 688 to 610. [2020-07-21 17:00:24,429 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 610 states. [2020-07-21 17:00:24,430 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 610 states to 610 states and 794 transitions. [2020-07-21 17:00:24,430 INFO L78 Accepts]: Start accepts. Automaton has 610 states and 794 transitions. Word has length 891 [2020-07-21 17:00:24,431 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 17:00:24,431 INFO L479 AbstractCegarLoop]: Abstraction has 610 states and 794 transitions. [2020-07-21 17:00:24,431 INFO L480 AbstractCegarLoop]: Interpolant automaton has 36 states. [2020-07-21 17:00:24,431 INFO L276 IsEmpty]: Start isEmpty. Operand 610 states and 794 transitions. [2020-07-21 17:00:24,441 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 934 [2020-07-21 17:00:24,441 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 17:00:24,442 INFO L422 BasicCegarLoop]: trace histogram [121, 121, 121, 120, 120, 120, 120, 20, 19, 19, 7, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 17:00:24,649 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 42 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 17:00:24,650 INFO L427 AbstractCegarLoop]: === Iteration 42 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 17:00:24,650 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 17:00:24,651 INFO L82 PathProgramCache]: Analyzing trace with hash -1311394747, now seen corresponding path program 39 times [2020-07-21 17:00:24,651 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 17:00:24,652 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [408584715] [2020-07-21 17:00:24,652 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 43 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 43 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 17:00:24,896 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 17:00:24,896 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 17:00:24,903 INFO L263 TraceCheckSpWp]: Trace formula consists of 1641 conjuncts, 25 conjunts are in the unsatisfiable core [2020-07-21 17:00:24,911 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 17:00:26,607 INFO L134 CoverageAnalysis]: Checked inductivity of 53462 backedges. 4622 proven. 19114 refuted. 0 times theorem prover too weak. 29726 trivial. 0 not checked. [2020-07-21 17:00:26,607 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 17:00:29,373 INFO L134 CoverageAnalysis]: Checked inductivity of 53462 backedges. 2331 proven. 19115 refuted. 0 times theorem prover too weak. 32016 trivial. 0 not checked. [2020-07-21 17:00:29,374 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [408584715] [2020-07-21 17:00:29,374 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 17:00:29,374 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26] total 43 [2020-07-21 17:00:29,374 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [397198907] [2020-07-21 17:00:29,375 INFO L459 AbstractCegarLoop]: Interpolant automaton has 43 states [2020-07-21 17:00:29,375 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 17:00:29,375 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2020-07-21 17:00:29,376 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=324, Invalid=1482, Unknown=0, NotChecked=0, Total=1806 [2020-07-21 17:00:29,376 INFO L87 Difference]: Start difference. First operand 610 states and 794 transitions. Second operand 43 states. [2020-07-21 17:00:49,525 WARN L193 SmtUtils]: Spent 114.00 ms on a formula simplification. DAG size of input: 29 DAG size of output: 25 [2020-07-21 17:00:55,201 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 25 [2020-07-21 17:00:58,404 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 26 [2020-07-21 17:00:59,445 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 17:00:59,445 INFO L93 Difference]: Finished difference Result 911 states and 1218 transitions. [2020-07-21 17:00:59,448 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 178 states. [2020-07-21 17:00:59,449 INFO L78 Accepts]: Start accepts. Automaton has 43 states. Word has length 933 [2020-07-21 17:00:59,450 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 17:00:59,453 INFO L225 Difference]: With dead ends: 911 [2020-07-21 17:00:59,453 INFO L226 Difference]: Without dead ends: 695 [2020-07-21 17:00:59,456 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2036 GetRequests, 1817 SyntacticMatches, 7 SemanticMatches, 212 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18507 ImplicationChecksByTransitivity, 24.6s TimeCoverageRelationStatistics Valid=8934, Invalid=36648, Unknown=0, NotChecked=0, Total=45582 [2020-07-21 17:00:59,457 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 695 states. [2020-07-21 17:00:59,654 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 695 to 643. [2020-07-21 17:00:59,654 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 643 states. [2020-07-21 17:00:59,657 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 643 states to 643 states and 838 transitions. [2020-07-21 17:00:59,658 INFO L78 Accepts]: Start accepts. Automaton has 643 states and 838 transitions. Word has length 933 [2020-07-21 17:00:59,659 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 17:00:59,659 INFO L479 AbstractCegarLoop]: Abstraction has 643 states and 838 transitions. [2020-07-21 17:00:59,659 INFO L480 AbstractCegarLoop]: Interpolant automaton has 43 states. [2020-07-21 17:00:59,659 INFO L276 IsEmpty]: Start isEmpty. Operand 643 states and 838 transitions. [2020-07-21 17:00:59,671 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1000 [2020-07-21 17:00:59,671 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 17:00:59,672 INFO L422 BasicCegarLoop]: trace histogram [130, 130, 130, 129, 129, 129, 129, 21, 20, 20, 7, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 17:00:59,886 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 43 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 17:00:59,887 INFO L427 AbstractCegarLoop]: === Iteration 43 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 17:00:59,887 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 17:00:59,888 INFO L82 PathProgramCache]: Analyzing trace with hash -874980193, now seen corresponding path program 40 times [2020-07-21 17:00:59,888 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 17:00:59,888 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2095253362] [2020-07-21 17:00:59,889 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 44 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 44 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 17:01:00,156 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 17:01:00,157 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 17:01:00,162 INFO L263 TraceCheckSpWp]: Trace formula consists of 1755 conjuncts, 23 conjunts are in the unsatisfiable core [2020-07-21 17:01:00,170 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 17:01:01,989 INFO L134 CoverageAnalysis]: Checked inductivity of 61675 backedges. 28429 proven. 3266 refuted. 0 times theorem prover too weak. 29980 trivial. 0 not checked. [2020-07-21 17:01:01,989 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 17:01:05,747 INFO L134 CoverageAnalysis]: Checked inductivity of 61675 backedges. 13923 proven. 10962 refuted. 0 times theorem prover too weak. 36790 trivial. 0 not checked. [2020-07-21 17:01:05,747 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2095253362] [2020-07-21 17:01:05,747 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 17:01:05,748 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24] total 40 [2020-07-21 17:01:05,748 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1402701788] [2020-07-21 17:01:05,749 INFO L459 AbstractCegarLoop]: Interpolant automaton has 40 states [2020-07-21 17:01:05,750 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 17:01:05,751 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2020-07-21 17:01:05,751 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=334, Invalid=1226, Unknown=0, NotChecked=0, Total=1560 [2020-07-21 17:01:05,751 INFO L87 Difference]: Start difference. First operand 643 states and 838 transitions. Second operand 40 states. [2020-07-21 17:01:22,518 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 17:01:22,518 INFO L93 Difference]: Finished difference Result 1106 states and 1481 transitions. [2020-07-21 17:01:22,522 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 122 states. [2020-07-21 17:01:22,522 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 999 [2020-07-21 17:01:22,524 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 17:01:22,527 INFO L225 Difference]: With dead ends: 1106 [2020-07-21 17:01:22,527 INFO L226 Difference]: Without dead ends: 715 [2020-07-21 17:01:22,532 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2114 GetRequests, 1959 SyntacticMatches, 6 SemanticMatches, 149 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5991 ImplicationChecksByTransitivity, 13.1s TimeCoverageRelationStatistics Valid=6299, Invalid=16351, Unknown=0, NotChecked=0, Total=22650 [2020-07-21 17:01:22,533 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 715 states. [2020-07-21 17:01:22,703 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 715 to 695. [2020-07-21 17:01:22,703 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 695 states. [2020-07-21 17:01:22,705 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 695 states to 695 states and 913 transitions. [2020-07-21 17:01:22,706 INFO L78 Accepts]: Start accepts. Automaton has 695 states and 913 transitions. Word has length 999 [2020-07-21 17:01:22,707 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 17:01:22,707 INFO L479 AbstractCegarLoop]: Abstraction has 695 states and 913 transitions. [2020-07-21 17:01:22,707 INFO L480 AbstractCegarLoop]: Interpolant automaton has 40 states. [2020-07-21 17:01:22,707 INFO L276 IsEmpty]: Start isEmpty. Operand 695 states and 913 transitions. [2020-07-21 17:01:22,719 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1007 [2020-07-21 17:01:22,719 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 17:01:22,720 INFO L422 BasicCegarLoop]: trace histogram [131, 131, 131, 130, 130, 130, 130, 21, 20, 20, 7, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 17:01:22,933 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 44 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 17:01:22,934 INFO L427 AbstractCegarLoop]: === Iteration 44 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 17:01:22,934 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 17:01:22,935 INFO L82 PathProgramCache]: Analyzing trace with hash -1744475458, now seen corresponding path program 41 times [2020-07-21 17:01:22,935 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 17:01:22,936 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2071951585] [2020-07-21 17:01:22,936 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 45 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 45 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 17:01:23,202 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 17:01:23,202 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 17:01:23,210 INFO L263 TraceCheckSpWp]: Trace formula consists of 1767 conjuncts, 27 conjunts are in the unsatisfiable core [2020-07-21 17:01:23,218 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 17:01:25,667 INFO L134 CoverageAnalysis]: Checked inductivity of 62602 backedges. 4173 proven. 23309 refuted. 0 times theorem prover too weak. 35120 trivial. 0 not checked. [2020-07-21 17:01:25,668 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 17:01:30,381 INFO L134 CoverageAnalysis]: Checked inductivity of 62602 backedges. 2164 proven. 23310 refuted. 0 times theorem prover too weak. 37128 trivial. 0 not checked. [2020-07-21 17:01:30,381 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2071951585] [2020-07-21 17:01:30,381 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 17:01:30,381 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 28] total 47 [2020-07-21 17:01:30,382 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1574635008] [2020-07-21 17:01:30,383 INFO L459 AbstractCegarLoop]: Interpolant automaton has 47 states [2020-07-21 17:01:30,383 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 17:01:30,383 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2020-07-21 17:01:30,384 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=383, Invalid=1779, Unknown=0, NotChecked=0, Total=2162 [2020-07-21 17:01:30,384 INFO L87 Difference]: Start difference. First operand 695 states and 913 transitions. Second operand 47 states. [2020-07-21 17:01:32,434 WARN L193 SmtUtils]: Spent 133.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 24 [2020-07-21 17:01:32,699 WARN L193 SmtUtils]: Spent 133.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 24 [2020-07-21 17:01:32,939 WARN L193 SmtUtils]: Spent 133.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 25 [2020-07-21 17:01:33,220 WARN L193 SmtUtils]: Spent 146.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 24 [2020-07-21 17:01:34,849 WARN L193 SmtUtils]: Spent 139.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 24 [2020-07-21 17:01:35,126 WARN L193 SmtUtils]: Spent 135.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 24 [2020-07-21 17:01:35,371 WARN L193 SmtUtils]: Spent 131.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 25 [2020-07-21 17:01:35,608 WARN L193 SmtUtils]: Spent 134.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 24 [2020-07-21 17:01:35,866 WARN L193 SmtUtils]: Spent 128.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 25 [2020-07-21 17:01:36,371 WARN L193 SmtUtils]: Spent 134.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 24 [2020-07-21 17:01:36,679 WARN L193 SmtUtils]: Spent 130.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 23 [2020-07-21 17:01:36,944 WARN L193 SmtUtils]: Spent 127.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 23 [2020-07-21 17:01:37,202 WARN L193 SmtUtils]: Spent 132.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 24 [2020-07-21 17:01:37,464 WARN L193 SmtUtils]: Spent 148.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 23 [2020-07-21 17:01:37,700 WARN L193 SmtUtils]: Spent 130.00 ms on a formula simplification. DAG size of input: 30 DAG size of output: 24 [2020-07-21 17:01:39,618 WARN L193 SmtUtils]: Spent 141.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 25 [2020-07-21 17:01:39,919 WARN L193 SmtUtils]: Spent 129.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 25 [2020-07-21 17:01:40,188 WARN L193 SmtUtils]: Spent 138.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 25 [2020-07-21 17:01:40,453 WARN L193 SmtUtils]: Spent 130.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 25 [2020-07-21 17:01:40,709 WARN L193 SmtUtils]: Spent 136.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 26 [2020-07-21 17:01:40,998 WARN L193 SmtUtils]: Spent 144.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 26 [2020-07-21 17:01:41,593 WARN L193 SmtUtils]: Spent 144.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 25 [2020-07-21 17:01:41,924 WARN L193 SmtUtils]: Spent 133.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 24 [2020-07-21 17:01:42,222 WARN L193 SmtUtils]: Spent 142.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 24 [2020-07-21 17:01:42,505 WARN L193 SmtUtils]: Spent 142.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 24 [2020-07-21 17:01:42,788 WARN L193 SmtUtils]: Spent 146.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 24 [2020-07-21 17:01:43,048 WARN L193 SmtUtils]: Spent 136.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 25 [2020-07-21 17:01:43,319 WARN L193 SmtUtils]: Spent 145.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 25 [2020-07-21 17:01:43,830 WARN L193 SmtUtils]: Spent 144.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 25 [2020-07-21 17:01:44,194 WARN L193 SmtUtils]: Spent 145.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 24 [2020-07-21 17:01:44,545 WARN L193 SmtUtils]: Spent 141.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 24 [2020-07-21 17:01:44,868 WARN L193 SmtUtils]: Spent 143.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 24 [2020-07-21 17:01:45,169 WARN L193 SmtUtils]: Spent 140.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 24 [2020-07-21 17:01:45,476 WARN L193 SmtUtils]: Spent 141.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 25 [2020-07-21 17:01:45,768 WARN L193 SmtUtils]: Spent 148.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 25 [2020-07-21 17:01:46,109 WARN L193 SmtUtils]: Spent 147.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 25 [2020-07-21 17:01:48,473 WARN L193 SmtUtils]: Spent 148.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 24 [2020-07-21 17:01:48,809 WARN L193 SmtUtils]: Spent 149.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 24 [2020-07-21 17:01:49,118 WARN L193 SmtUtils]: Spent 149.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 25 [2020-07-21 17:01:49,402 WARN L193 SmtUtils]: Spent 149.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 24 [2020-07-21 17:01:49,681 WARN L193 SmtUtils]: Spent 143.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 25 [2020-07-21 17:01:49,946 WARN L193 SmtUtils]: Spent 142.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 25 [2020-07-21 17:01:50,246 WARN L193 SmtUtils]: Spent 144.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 25 [2020-07-21 17:01:50,690 WARN L193 SmtUtils]: Spent 141.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 24 [2020-07-21 17:01:51,054 WARN L193 SmtUtils]: Spent 137.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 23 [2020-07-21 17:01:51,422 WARN L193 SmtUtils]: Spent 145.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 23 [2020-07-21 17:01:51,772 WARN L193 SmtUtils]: Spent 147.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 24 [2020-07-21 17:01:52,106 WARN L193 SmtUtils]: Spent 151.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 23 [2020-07-21 17:01:52,423 WARN L193 SmtUtils]: Spent 150.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 24 [2020-07-21 17:01:52,717 WARN L193 SmtUtils]: Spent 142.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 24 [2020-07-21 17:01:53,013 WARN L193 SmtUtils]: Spent 148.00 ms on a formula simplification. DAG size of input: 30 DAG size of output: 24 [2020-07-21 17:01:53,562 WARN L193 SmtUtils]: Spent 153.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 24 [2020-07-21 17:01:53,953 WARN L193 SmtUtils]: Spent 144.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 23 [2020-07-21 17:01:54,325 WARN L193 SmtUtils]: Spent 142.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 23 [2020-07-21 17:01:54,691 WARN L193 SmtUtils]: Spent 149.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 24 [2020-07-21 17:01:55,055 WARN L193 SmtUtils]: Spent 158.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 23 [2020-07-21 17:01:55,383 WARN L193 SmtUtils]: Spent 144.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 24 [2020-07-21 17:01:55,709 WARN L193 SmtUtils]: Spent 155.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 24 [2020-07-21 17:01:56,018 WARN L193 SmtUtils]: Spent 146.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 24 [2020-07-21 17:01:56,367 WARN L193 SmtUtils]: Spent 151.00 ms on a formula simplification. DAG size of input: 30 DAG size of output: 24 [2020-07-21 17:01:57,004 WARN L193 SmtUtils]: Spent 140.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 23 [2020-07-21 17:01:57,427 WARN L193 SmtUtils]: Spent 151.00 ms on a formula simplification. DAG size of input: 34 DAG size of output: 25 [2020-07-21 17:01:57,820 WARN L193 SmtUtils]: Spent 152.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 24 [2020-07-21 17:01:58,210 WARN L193 SmtUtils]: Spent 152.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 24 [2020-07-21 17:01:58,596 WARN L193 SmtUtils]: Spent 152.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 24 [2020-07-21 17:01:58,924 WARN L193 SmtUtils]: Spent 120.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 24 [2020-07-21 17:01:59,223 WARN L193 SmtUtils]: Spent 132.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 25 [2020-07-21 17:01:59,569 WARN L193 SmtUtils]: Spent 147.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 25 [2020-07-21 17:01:59,898 WARN L193 SmtUtils]: Spent 153.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 25 [2020-07-21 17:02:00,208 WARN L193 SmtUtils]: Spent 150.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 25 [2020-07-21 17:02:02,892 WARN L193 SmtUtils]: Spent 137.00 ms on a formula simplification. DAG size of input: 29 DAG size of output: 25 [2020-07-21 17:02:03,253 WARN L193 SmtUtils]: Spent 137.00 ms on a formula simplification. DAG size of input: 29 DAG size of output: 25 [2020-07-21 17:02:03,574 WARN L193 SmtUtils]: Spent 136.00 ms on a formula simplification. DAG size of input: 29 DAG size of output: 26 [2020-07-21 17:02:03,894 WARN L193 SmtUtils]: Spent 143.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 25 [2020-07-21 17:02:04,208 WARN L193 SmtUtils]: Spent 150.00 ms on a formula simplification. DAG size of input: 29 DAG size of output: 25 [2020-07-21 17:02:04,505 WARN L193 SmtUtils]: Spent 142.00 ms on a formula simplification. DAG size of input: 29 DAG size of output: 26 [2020-07-21 17:02:04,796 WARN L193 SmtUtils]: Spent 141.00 ms on a formula simplification. DAG size of input: 29 DAG size of output: 26 [2020-07-21 17:02:05,115 WARN L193 SmtUtils]: Spent 142.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 26 [2020-07-21 17:02:05,751 WARN L193 SmtUtils]: Spent 142.00 ms on a formula simplification. DAG size of input: 29 DAG size of output: 25 [2020-07-21 17:02:06,179 WARN L193 SmtUtils]: Spent 150.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 24 [2020-07-21 17:02:06,562 WARN L193 SmtUtils]: Spent 146.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 24 [2020-07-21 17:02:06,931 WARN L193 SmtUtils]: Spent 144.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 25 [2020-07-21 17:02:07,282 WARN L193 SmtUtils]: Spent 139.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 24 [2020-07-21 17:02:07,633 WARN L193 SmtUtils]: Spent 150.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 24 [2020-07-21 17:02:07,961 WARN L193 SmtUtils]: Spent 145.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 25 [2020-07-21 17:02:08,292 WARN L193 SmtUtils]: Spent 155.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 25 [2020-07-21 17:02:08,581 WARN L193 SmtUtils]: Spent 141.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 25 [2020-07-21 17:02:08,982 WARN L193 SmtUtils]: Spent 160.00 ms on a formula simplification. DAG size of input: 29 DAG size of output: 25 [2020-07-21 17:02:09,393 WARN L193 SmtUtils]: Spent 147.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 24 [2020-07-21 17:02:09,804 WARN L193 SmtUtils]: Spent 147.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 24 [2020-07-21 17:02:10,188 WARN L193 SmtUtils]: Spent 147.00 ms on a formula simplification. DAG size of input: 29 DAG size of output: 25 [2020-07-21 17:02:10,571 WARN L193 SmtUtils]: Spent 146.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 24 [2020-07-21 17:02:10,933 WARN L193 SmtUtils]: Spent 141.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 24 [2020-07-21 17:02:11,276 WARN L193 SmtUtils]: Spent 147.00 ms on a formula simplification. DAG size of input: 29 DAG size of output: 25 [2020-07-21 17:02:11,621 WARN L193 SmtUtils]: Spent 148.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 25 [2020-07-21 17:02:11,935 WARN L193 SmtUtils]: Spent 145.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 25 [2020-07-21 17:02:12,267 WARN L193 SmtUtils]: Spent 149.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 25 [2020-07-21 17:02:12,982 WARN L193 SmtUtils]: Spent 152.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 24 [2020-07-21 17:02:13,448 WARN L193 SmtUtils]: Spent 155.00 ms on a formula simplification. DAG size of input: 30 DAG size of output: 26 [2020-07-21 17:02:13,881 WARN L193 SmtUtils]: Spent 151.00 ms on a formula simplification. DAG size of input: 29 DAG size of output: 25 [2020-07-21 17:02:14,307 WARN L193 SmtUtils]: Spent 144.00 ms on a formula simplification. DAG size of input: 29 DAG size of output: 25 [2020-07-21 17:02:14,738 WARN L193 SmtUtils]: Spent 159.00 ms on a formula simplification. DAG size of input: 29 DAG size of output: 25 [2020-07-21 17:02:15,153 WARN L193 SmtUtils]: Spent 147.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 25 [2020-07-21 17:02:15,574 WARN L193 SmtUtils]: Spent 145.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 25 [2020-07-21 17:02:15,947 WARN L193 SmtUtils]: Spent 147.00 ms on a formula simplification. DAG size of input: 29 DAG size of output: 26 [2020-07-21 17:02:16,314 WARN L193 SmtUtils]: Spent 155.00 ms on a formula simplification. DAG size of input: 29 DAG size of output: 26 [2020-07-21 17:02:16,656 WARN L193 SmtUtils]: Spent 149.00 ms on a formula simplification. DAG size of input: 29 DAG size of output: 26 [2020-07-21 17:02:16,986 WARN L193 SmtUtils]: Spent 153.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 26 [2020-07-21 17:02:17,594 WARN L193 SmtUtils]: Spent 145.00 ms on a formula simplification. DAG size of input: 24 DAG size of output: 23 [2020-07-21 17:02:18,506 WARN L193 SmtUtils]: Spent 148.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 25 [2020-07-21 17:02:18,909 WARN L193 SmtUtils]: Spent 142.00 ms on a formula simplification. DAG size of input: 25 DAG size of output: 24 [2020-07-21 17:02:19,308 WARN L193 SmtUtils]: Spent 147.00 ms on a formula simplification. DAG size of input: 25 DAG size of output: 24 [2020-07-21 17:02:19,711 WARN L193 SmtUtils]: Spent 151.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 25 [2020-07-21 17:02:20,075 WARN L193 SmtUtils]: Spent 127.00 ms on a formula simplification. DAG size of input: 25 DAG size of output: 24 [2020-07-21 17:02:20,438 WARN L193 SmtUtils]: Spent 129.00 ms on a formula simplification. DAG size of input: 25 DAG size of output: 24 [2020-07-21 17:02:21,115 WARN L193 SmtUtils]: Spent 129.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 25 [2020-07-21 17:02:21,451 WARN L193 SmtUtils]: Spent 139.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 25 [2020-07-21 17:02:21,801 WARN L193 SmtUtils]: Spent 145.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 25 [2020-07-21 17:02:22,139 WARN L193 SmtUtils]: Spent 140.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 25 [2020-07-21 17:02:22,425 WARN L193 SmtUtils]: Spent 160.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 26 [2020-07-21 17:02:23,096 WARN L193 SmtUtils]: Spent 150.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 25 [2020-07-21 17:02:24,261 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 20 [2020-07-21 17:02:24,967 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 17:02:24,967 INFO L93 Difference]: Finished difference Result 1178 states and 1580 transitions. [2020-07-21 17:02:24,974 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 195 states. [2020-07-21 17:02:24,975 INFO L78 Accepts]: Start accepts. Automaton has 47 states. Word has length 1006 [2020-07-21 17:02:24,976 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 17:02:24,980 INFO L225 Difference]: With dead ends: 1178 [2020-07-21 17:02:24,981 INFO L226 Difference]: Without dead ends: 871 [2020-07-21 17:02:24,985 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2199 GetRequests, 1959 SyntacticMatches, 7 SemanticMatches, 233 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22228 ImplicationChecksByTransitivity, 44.5s TimeCoverageRelationStatistics Valid=10926, Invalid=44064, Unknown=0, NotChecked=0, Total=54990 [2020-07-21 17:02:24,986 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 871 states. [2020-07-21 17:02:25,130 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 871 to 733. [2020-07-21 17:02:25,130 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 733 states. [2020-07-21 17:02:25,134 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 733 states to 733 states and 965 transitions. [2020-07-21 17:02:25,134 INFO L78 Accepts]: Start accepts. Automaton has 733 states and 965 transitions. Word has length 1006 [2020-07-21 17:02:25,135 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 17:02:25,136 INFO L479 AbstractCegarLoop]: Abstraction has 733 states and 965 transitions. [2020-07-21 17:02:25,136 INFO L480 AbstractCegarLoop]: Interpolant automaton has 47 states. [2020-07-21 17:02:25,136 INFO L276 IsEmpty]: Start isEmpty. Operand 733 states and 965 transitions. [2020-07-21 17:02:25,150 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1083 [2020-07-21 17:02:25,150 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 17:02:25,151 INFO L422 BasicCegarLoop]: trace histogram [141, 141, 141, 140, 140, 140, 140, 22, 21, 21, 8, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 17:02:25,364 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 45 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 17:02:25,365 INFO L427 AbstractCegarLoop]: === Iteration 45 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 17:02:25,365 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 17:02:25,366 INFO L82 PathProgramCache]: Analyzing trace with hash 2076739844, now seen corresponding path program 42 times [2020-07-21 17:02:25,366 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 17:02:25,366 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1968956022] [2020-07-21 17:02:25,367 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 46 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 46 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 17:02:25,671 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 17:02:25,671 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 17:02:25,678 INFO L263 TraceCheckSpWp]: Trace formula consists of 1899 conjuncts, 25 conjunts are in the unsatisfiable core [2020-07-21 17:02:25,687 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 17:02:28,553 INFO L134 CoverageAnalysis]: Checked inductivity of 72506 backedges. 33195 proven. 3949 refuted. 0 times theorem prover too weak. 35362 trivial. 0 not checked. [2020-07-21 17:02:28,553 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 17:02:34,669 INFO L134 CoverageAnalysis]: Checked inductivity of 72506 backedges. 15505 proven. 14169 refuted. 0 times theorem prover too weak. 42832 trivial. 0 not checked. [2020-07-21 17:02:34,669 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1968956022] [2020-07-21 17:02:34,669 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 17:02:34,670 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26] total 44 [2020-07-21 17:02:34,670 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [277339499] [2020-07-21 17:02:34,671 INFO L459 AbstractCegarLoop]: Interpolant automaton has 44 states [2020-07-21 17:02:34,671 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 17:02:34,671 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2020-07-21 17:02:34,671 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=399, Invalid=1493, Unknown=0, NotChecked=0, Total=1892 [2020-07-21 17:02:34,672 INFO L87 Difference]: Start difference. First operand 733 states and 965 transitions. Second operand 44 states. [2020-07-21 17:02:57,773 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 17:02:57,774 INFO L93 Difference]: Finished difference Result 1089 states and 1476 transitions. [2020-07-21 17:02:57,779 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 124 states. [2020-07-21 17:02:57,780 INFO L78 Accepts]: Start accepts. Automaton has 44 states. Word has length 1082 [2020-07-21 17:02:57,781 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 17:02:57,785 INFO L225 Difference]: With dead ends: 1089 [2020-07-21 17:02:57,785 INFO L226 Difference]: Without dead ends: 804 [2020-07-21 17:02:57,789 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2281 GetRequests, 2121 SyntacticMatches, 6 SemanticMatches, 154 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6334 ImplicationChecksByTransitivity, 19.9s TimeCoverageRelationStatistics Valid=6718, Invalid=17462, Unknown=0, NotChecked=0, Total=24180 [2020-07-21 17:02:57,790 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 804 states. [2020-07-21 17:02:57,956 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 804 to 785. [2020-07-21 17:02:57,957 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 785 states. [2020-07-21 17:02:57,959 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 785 states to 785 states and 1040 transitions. [2020-07-21 17:02:57,959 INFO L78 Accepts]: Start accepts. Automaton has 785 states and 1040 transitions. Word has length 1082 [2020-07-21 17:02:57,960 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 17:02:57,960 INFO L479 AbstractCegarLoop]: Abstraction has 785 states and 1040 transitions. [2020-07-21 17:02:57,960 INFO L480 AbstractCegarLoop]: Interpolant automaton has 44 states. [2020-07-21 17:02:57,960 INFO L276 IsEmpty]: Start isEmpty. Operand 785 states and 1040 transitions. [2020-07-21 17:02:57,971 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1090 [2020-07-21 17:02:57,971 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 17:02:57,972 INFO L422 BasicCegarLoop]: trace histogram [142, 142, 142, 141, 141, 141, 141, 22, 21, 21, 8, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 17:02:58,185 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 46 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 17:02:58,186 INFO L427 AbstractCegarLoop]: === Iteration 46 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 17:02:58,186 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 17:02:58,187 INFO L82 PathProgramCache]: Analyzing trace with hash -690954159, now seen corresponding path program 43 times [2020-07-21 17:02:58,187 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 17:02:58,188 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1437648208] [2020-07-21 17:02:58,188 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 47 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 47 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 17:02:58,488 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 17:02:58,488 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 17:02:58,498 INFO L263 TraceCheckSpWp]: Trace formula consists of 1911 conjuncts, 19 conjunts are in the unsatisfiable core [2020-07-21 17:02:58,507 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 17:03:00,416 INFO L134 CoverageAnalysis]: Checked inductivity of 73511 backedges. 8101 proven. 22805 refuted. 0 times theorem prover too weak. 42605 trivial. 0 not checked. [2020-07-21 17:03:00,416 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 17:03:05,547 INFO L134 CoverageAnalysis]: Checked inductivity of 73511 backedges. 3860 proven. 22806 refuted. 0 times theorem prover too weak. 46845 trivial. 0 not checked. [2020-07-21 17:03:05,547 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1437648208] [2020-07-21 17:03:05,547 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 17:03:05,548 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20] total 30 [2020-07-21 17:03:05,548 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [915265265] [2020-07-21 17:03:05,549 INFO L459 AbstractCegarLoop]: Interpolant automaton has 30 states [2020-07-21 17:03:05,549 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 17:03:05,549 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2020-07-21 17:03:05,550 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=183, Invalid=687, Unknown=0, NotChecked=0, Total=870 [2020-07-21 17:03:05,550 INFO L87 Difference]: Start difference. First operand 785 states and 1040 transitions. Second operand 30 states. [2020-07-21 17:03:06,235 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 19 DAG size of output: 15 [2020-07-21 17:03:06,442 WARN L193 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 19 DAG size of output: 17 [2020-07-21 17:03:06,659 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 18 DAG size of output: 16 [2020-07-21 17:03:06,949 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 19 DAG size of output: 13 [2020-07-21 17:03:07,608 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 20 DAG size of output: 18 [2020-07-21 17:03:09,005 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 16 [2020-07-21 17:03:09,217 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 20 DAG size of output: 15 [2020-07-21 17:03:09,712 WARN L193 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 20 DAG size of output: 18 [2020-07-21 17:03:11,389 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 20 DAG size of output: 14 [2020-07-21 17:03:12,100 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 16 [2020-07-21 17:03:12,621 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 19 [2020-07-21 17:03:14,848 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 20 DAG size of output: 14 [2020-07-21 17:03:15,585 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 16 [2020-07-21 17:03:15,820 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 16 [2020-07-21 17:03:16,358 WARN L193 SmtUtils]: Spent 112.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 19 [2020-07-21 17:03:24,544 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 18 DAG size of output: 17 [2020-07-21 17:03:25,935 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 17:03:25,935 INFO L93 Difference]: Finished difference Result 1691 states and 2300 transitions. [2020-07-21 17:03:25,941 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 105 states. [2020-07-21 17:03:25,942 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 1089 [2020-07-21 17:03:25,943 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 17:03:25,949 INFO L225 Difference]: With dead ends: 1691 [2020-07-21 17:03:25,949 INFO L226 Difference]: Without dead ends: 1390 [2020-07-21 17:03:25,952 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2275 GetRequests, 2141 SyntacticMatches, 8 SemanticMatches, 126 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6349 ImplicationChecksByTransitivity, 16.8s TimeCoverageRelationStatistics Valid=3306, Invalid=12950, Unknown=0, NotChecked=0, Total=16256 [2020-07-21 17:03:25,954 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1390 states. [2020-07-21 17:03:26,171 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1390 to 984. [2020-07-21 17:03:26,171 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 984 states. [2020-07-21 17:03:26,173 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 984 states to 984 states and 1300 transitions. [2020-07-21 17:03:26,174 INFO L78 Accepts]: Start accepts. Automaton has 984 states and 1300 transitions. Word has length 1089 [2020-07-21 17:03:26,175 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 17:03:26,175 INFO L479 AbstractCegarLoop]: Abstraction has 984 states and 1300 transitions. [2020-07-21 17:03:26,175 INFO L480 AbstractCegarLoop]: Interpolant automaton has 30 states. [2020-07-21 17:03:26,175 INFO L276 IsEmpty]: Start isEmpty. Operand 984 states and 1300 transitions. [2020-07-21 17:03:26,186 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1135 [2020-07-21 17:03:26,186 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 17:03:26,186 INFO L422 BasicCegarLoop]: trace histogram [148, 148, 148, 147, 147, 147, 147, 23, 22, 22, 8, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 17:03:26,387 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 47 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 17:03:26,387 INFO L427 AbstractCegarLoop]: === Iteration 47 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 17:03:26,388 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 17:03:26,389 INFO L82 PathProgramCache]: Analyzing trace with hash -944230286, now seen corresponding path program 44 times [2020-07-21 17:03:26,389 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 17:03:26,389 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [357515054] [2020-07-21 17:03:26,389 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 48 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 48 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 17:03:26,694 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 17:03:26,695 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 17:03:26,704 INFO L263 TraceCheckSpWp]: Trace formula consists of 1989 conjuncts, 17 conjunts are in the unsatisfiable core [2020-07-21 17:03:26,713 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 17:03:28,474 INFO L134 CoverageAnalysis]: Checked inductivity of 79907 backedges. 34637 proven. 2618 refuted. 0 times theorem prover too weak. 42652 trivial. 0 not checked. [2020-07-21 17:03:28,475 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 17:03:34,134 INFO L134 CoverageAnalysis]: Checked inductivity of 79907 backedges. 26747 proven. 2618 refuted. 0 times theorem prover too weak. 50542 trivial. 0 not checked. [2020-07-21 17:03:34,134 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [357515054] [2020-07-21 17:03:34,135 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 17:03:34,135 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18] total 27 [2020-07-21 17:03:34,135 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [659677055] [2020-07-21 17:03:34,136 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-07-21 17:03:34,136 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 17:03:34,137 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-07-21 17:03:34,137 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=168, Invalid=534, Unknown=0, NotChecked=0, Total=702 [2020-07-21 17:03:34,137 INFO L87 Difference]: Start difference. First operand 984 states and 1300 transitions. Second operand 27 states. [2020-07-21 17:03:43,439 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 17:03:43,440 INFO L93 Difference]: Finished difference Result 1307 states and 1759 transitions. [2020-07-21 17:03:43,444 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 55 states. [2020-07-21 17:03:43,444 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 1134 [2020-07-21 17:03:43,445 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 17:03:43,450 INFO L225 Difference]: With dead ends: 1307 [2020-07-21 17:03:43,450 INFO L226 Difference]: Without dead ends: 810 [2020-07-21 17:03:43,452 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2319 GetRequests, 2242 SyntacticMatches, 7 SemanticMatches, 70 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1055 ImplicationChecksByTransitivity, 7.4s TimeCoverageRelationStatistics Valid=1491, Invalid=3621, Unknown=0, NotChecked=0, Total=5112 [2020-07-21 17:03:43,452 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 810 states. [2020-07-21 17:03:43,622 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 810 to 810. [2020-07-21 17:03:43,623 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 810 states. [2020-07-21 17:03:43,625 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 810 states to 810 states and 1070 transitions. [2020-07-21 17:03:43,625 INFO L78 Accepts]: Start accepts. Automaton has 810 states and 1070 transitions. Word has length 1134 [2020-07-21 17:03:43,626 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 17:03:43,626 INFO L479 AbstractCegarLoop]: Abstraction has 810 states and 1070 transitions. [2020-07-21 17:03:43,626 INFO L480 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-07-21 17:03:43,626 INFO L276 IsEmpty]: Start isEmpty. Operand 810 states and 1070 transitions. [2020-07-21 17:03:43,637 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1142 [2020-07-21 17:03:43,637 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 17:03:43,638 INFO L422 BasicCegarLoop]: trace histogram [149, 149, 149, 148, 148, 148, 148, 23, 22, 22, 8, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 17:03:43,838 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 48 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 17:03:43,839 INFO L427 AbstractCegarLoop]: === Iteration 48 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 17:03:43,839 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 17:03:43,840 INFO L82 PathProgramCache]: Analyzing trace with hash -211111029, now seen corresponding path program 45 times [2020-07-21 17:03:43,840 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 17:03:43,841 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2134667600] [2020-07-21 17:03:43,841 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 49 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 49 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 17:03:44,171 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 17:03:44,172 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 17:03:44,182 INFO L263 TraceCheckSpWp]: Trace formula consists of 2001 conjuncts, 21 conjunts are in the unsatisfiable core [2020-07-21 17:03:44,195 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 17:03:46,615 INFO L134 CoverageAnalysis]: Checked inductivity of 80962 backedges. 7593 proven. 26378 refuted. 0 times theorem prover too weak. 46991 trivial. 0 not checked. [2020-07-21 17:03:46,616 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 17:03:52,683 INFO L134 CoverageAnalysis]: Checked inductivity of 80962 backedges. 3658 proven. 26379 refuted. 0 times theorem prover too weak. 50925 trivial. 0 not checked. [2020-07-21 17:03:52,683 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2134667600] [2020-07-21 17:03:52,683 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 17:03:52,684 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22] total 34 [2020-07-21 17:03:52,684 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1715783399] [2020-07-21 17:03:52,685 INFO L459 AbstractCegarLoop]: Interpolant automaton has 34 states [2020-07-21 17:03:52,686 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 17:03:52,686 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2020-07-21 17:03:52,686 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=221, Invalid=901, Unknown=0, NotChecked=0, Total=1122 [2020-07-21 17:03:52,687 INFO L87 Difference]: Start difference. First operand 810 states and 1070 transitions. Second operand 34 states. [2020-07-21 17:03:53,245 WARN L193 SmtUtils]: Spent 112.00 ms on a formula simplification. DAG size of input: 20 DAG size of output: 15 [2020-07-21 17:03:53,498 WARN L193 SmtUtils]: Spent 112.00 ms on a formula simplification. DAG size of input: 20 DAG size of output: 16 [2020-07-21 17:03:53,755 WARN L193 SmtUtils]: Spent 131.00 ms on a formula simplification. DAG size of input: 24 DAG size of output: 18 [2020-07-21 17:03:54,021 WARN L193 SmtUtils]: Spent 123.00 ms on a formula simplification. DAG size of input: 20 DAG size of output: 17 [2020-07-21 17:03:54,351 WARN L193 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 15 [2020-07-21 17:03:54,584 WARN L193 SmtUtils]: Spent 113.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 16 [2020-07-21 17:03:54,823 WARN L193 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 20 DAG size of output: 16 [2020-07-21 17:03:55,090 WARN L193 SmtUtils]: Spent 121.00 ms on a formula simplification. DAG size of input: 25 DAG size of output: 19 [2020-07-21 17:03:55,402 WARN L193 SmtUtils]: Spent 179.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 22 [2020-07-21 17:03:55,748 WARN L193 SmtUtils]: Spent 186.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 23 [2020-07-21 17:03:56,072 WARN L193 SmtUtils]: Spent 184.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 23 [2020-07-21 17:03:56,407 WARN L193 SmtUtils]: Spent 182.00 ms on a formula simplification. DAG size of input: 30 DAG size of output: 23 [2020-07-21 17:03:56,682 WARN L193 SmtUtils]: Spent 124.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 19 [2020-07-21 17:03:56,973 WARN L193 SmtUtils]: Spent 122.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 20 [2020-07-21 17:03:57,323 WARN L193 SmtUtils]: Spent 116.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 16 [2020-07-21 17:03:57,590 WARN L193 SmtUtils]: Spent 114.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 17 [2020-07-21 17:03:57,821 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 17 [2020-07-21 17:03:58,061 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 17 [2020-07-21 17:03:58,349 WARN L193 SmtUtils]: Spent 127.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 20 [2020-07-21 17:03:58,674 WARN L193 SmtUtils]: Spent 183.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 22 [2020-07-21 17:03:59,029 WARN L193 SmtUtils]: Spent 181.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 23 [2020-07-21 17:03:59,352 WARN L193 SmtUtils]: Spent 185.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 23 [2020-07-21 17:03:59,668 WARN L193 SmtUtils]: Spent 186.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 23 [2020-07-21 17:04:00,011 WARN L193 SmtUtils]: Spent 182.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 24 [2020-07-21 17:04:00,296 WARN L193 SmtUtils]: Spent 122.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 20 [2020-07-21 17:04:02,435 WARN L193 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 16 [2020-07-21 17:04:02,721 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 17 [2020-07-21 17:04:03,351 WARN L193 SmtUtils]: Spent 112.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 17 [2020-07-21 17:04:03,667 WARN L193 SmtUtils]: Spent 135.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 21 [2020-07-21 17:04:04,036 WARN L193 SmtUtils]: Spent 192.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 23 [2020-07-21 17:04:04,423 WARN L193 SmtUtils]: Spent 187.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 24 [2020-07-21 17:04:04,794 WARN L193 SmtUtils]: Spent 190.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 24 [2020-07-21 17:04:05,133 WARN L193 SmtUtils]: Spent 187.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 24 [2020-07-21 17:04:05,462 WARN L193 SmtUtils]: Spent 182.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 24 [2020-07-21 17:04:05,787 WARN L193 SmtUtils]: Spent 144.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 25 [2020-07-21 17:04:06,086 WARN L193 SmtUtils]: Spent 119.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 20 [2020-07-21 17:04:08,790 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 16 [2020-07-21 17:04:09,071 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 17 [2020-07-21 17:04:09,333 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 17 [2020-07-21 17:04:09,574 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 18 [2020-07-21 17:04:09,835 WARN L193 SmtUtils]: Spent 113.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 18 [2020-07-21 17:04:10,138 WARN L193 SmtUtils]: Spent 119.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 17 [2020-07-21 17:04:10,470 WARN L193 SmtUtils]: Spent 136.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 21 [2020-07-21 17:04:10,874 WARN L193 SmtUtils]: Spent 188.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 23 [2020-07-21 17:04:11,289 WARN L193 SmtUtils]: Spent 186.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 24 [2020-07-21 17:04:11,687 WARN L193 SmtUtils]: Spent 191.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 24 [2020-07-21 17:04:12,057 WARN L193 SmtUtils]: Spent 189.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 24 [2020-07-21 17:04:12,427 WARN L193 SmtUtils]: Spent 195.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 25 [2020-07-21 17:04:12,778 WARN L193 SmtUtils]: Spent 190.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 24 [2020-07-21 17:04:13,162 WARN L193 SmtUtils]: Spent 195.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 25 [2020-07-21 17:04:13,471 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 17 [2020-07-21 17:04:20,092 WARN L193 SmtUtils]: Spent 115.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 16 [2020-07-21 17:04:20,429 WARN L193 SmtUtils]: Spent 121.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 17 [2020-07-21 17:04:20,741 WARN L193 SmtUtils]: Spent 118.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 17 [2020-07-21 17:04:21,062 WARN L193 SmtUtils]: Spent 119.00 ms on a formula simplification. DAG size of input: 24 DAG size of output: 18 [2020-07-21 17:04:21,371 WARN L193 SmtUtils]: Spent 115.00 ms on a formula simplification. DAG size of input: 24 DAG size of output: 18 [2020-07-21 17:04:21,663 WARN L193 SmtUtils]: Spent 120.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 18 [2020-07-21 17:04:21,963 WARN L193 SmtUtils]: Spent 117.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 17 [2020-07-21 17:04:22,307 WARN L193 SmtUtils]: Spent 135.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 21 [2020-07-21 17:04:22,730 WARN L193 SmtUtils]: Spent 190.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 23 [2020-07-21 17:04:23,190 WARN L193 SmtUtils]: Spent 200.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 24 [2020-07-21 17:04:23,623 WARN L193 SmtUtils]: Spent 194.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 24 [2020-07-21 17:04:24,036 WARN L193 SmtUtils]: Spent 197.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 24 [2020-07-21 17:04:24,448 WARN L193 SmtUtils]: Spent 202.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 25 [2020-07-21 17:04:24,850 WARN L193 SmtUtils]: Spent 214.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 25 [2020-07-21 17:04:25,218 WARN L193 SmtUtils]: Spent 200.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 24 [2020-07-21 17:04:25,618 WARN L193 SmtUtils]: Spent 201.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 25 [2020-07-21 17:04:25,927 WARN L193 SmtUtils]: Spent 113.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 17 [2020-07-21 17:04:29,933 WARN L193 SmtUtils]: Spent 117.00 ms on a formula simplification. DAG size of input: 20 DAG size of output: 16 [2020-07-21 17:04:30,581 WARN L193 SmtUtils]: Spent 112.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 17 [2020-07-21 17:04:30,884 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 18 [2020-07-21 17:04:31,188 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 18 [2020-07-21 17:04:32,289 WARN L193 SmtUtils]: Spent 111.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 21 [2020-07-21 17:04:32,630 WARN L193 SmtUtils]: Spent 158.00 ms on a formula simplification. DAG size of input: 24 DAG size of output: 23 [2020-07-21 17:04:32,844 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 25 DAG size of output: 18 [2020-07-21 17:04:33,047 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 17 [2020-07-21 17:04:33,438 WARN L193 SmtUtils]: Spent 150.00 ms on a formula simplification. DAG size of input: 25 DAG size of output: 24 [2020-07-21 17:04:33,794 WARN L193 SmtUtils]: Spent 147.00 ms on a formula simplification. DAG size of input: 25 DAG size of output: 24 [2020-07-21 17:04:34,183 WARN L193 SmtUtils]: Spent 174.00 ms on a formula simplification. DAG size of input: 25 DAG size of output: 24 [2020-07-21 17:04:34,601 WARN L193 SmtUtils]: Spent 189.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 25 [2020-07-21 17:04:35,000 WARN L193 SmtUtils]: Spent 176.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 25 [2020-07-21 17:04:35,401 WARN L193 SmtUtils]: Spent 188.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 25 [2020-07-21 17:04:35,773 WARN L193 SmtUtils]: Spent 179.00 ms on a formula simplification. DAG size of input: 25 DAG size of output: 24 [2020-07-21 17:04:36,103 WARN L193 SmtUtils]: Spent 201.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 25 [2020-07-21 17:04:36,837 WARN L193 SmtUtils]: Spent 182.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 25 [2020-07-21 17:04:37,890 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 17:04:37,890 INFO L93 Difference]: Finished difference Result 1330 states and 1815 transitions. [2020-07-21 17:04:37,897 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 161 states. [2020-07-21 17:04:37,898 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 1141 [2020-07-21 17:04:37,899 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 17:04:37,904 INFO L225 Difference]: With dead ends: 1330 [2020-07-21 17:04:37,905 INFO L226 Difference]: Without dead ends: 1019 [2020-07-21 17:04:37,911 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2435 GetRequests, 2241 SyntacticMatches, 8 SemanticMatches, 186 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14972 ImplicationChecksByTransitivity, 37.0s TimeCoverageRelationStatistics Valid=6712, Invalid=28444, Unknown=0, NotChecked=0, Total=35156 [2020-07-21 17:04:37,913 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1019 states. [2020-07-21 17:04:38,106 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1019 to 837. [2020-07-21 17:04:38,106 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 837 states. [2020-07-21 17:04:38,108 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 837 states to 837 states and 1106 transitions. [2020-07-21 17:04:38,109 INFO L78 Accepts]: Start accepts. Automaton has 837 states and 1106 transitions. Word has length 1141 [2020-07-21 17:04:38,110 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 17:04:38,110 INFO L479 AbstractCegarLoop]: Abstraction has 837 states and 1106 transitions. [2020-07-21 17:04:38,110 INFO L480 AbstractCegarLoop]: Interpolant automaton has 34 states. [2020-07-21 17:04:38,110 INFO L276 IsEmpty]: Start isEmpty. Operand 837 states and 1106 transitions. [2020-07-21 17:04:38,122 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1194 [2020-07-21 17:04:38,122 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 17:04:38,123 INFO L422 BasicCegarLoop]: trace histogram [156, 156, 156, 155, 155, 155, 155, 24, 23, 23, 8, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 17:04:38,323 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 49 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 17:04:38,324 INFO L427 AbstractCegarLoop]: === Iteration 49 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 17:04:38,324 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 17:04:38,325 INFO L82 PathProgramCache]: Analyzing trace with hash -2061681211, now seen corresponding path program 46 times [2020-07-21 17:04:38,326 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 17:04:38,326 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [257074441] [2020-07-21 17:04:38,327 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 50 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 50 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 17:04:38,669 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 17:04:38,669 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 17:04:38,679 INFO L263 TraceCheckSpWp]: Trace formula consists of 2091 conjuncts, 19 conjunts are in the unsatisfiable core [2020-07-21 17:04:38,692 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 17:04:41,088 INFO L134 CoverageAnalysis]: Checked inductivity of 88773 backedges. 38517 proven. 3198 refuted. 0 times theorem prover too weak. 47058 trivial. 0 not checked. [2020-07-21 17:04:41,089 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 17:04:48,065 INFO L134 CoverageAnalysis]: Checked inductivity of 88773 backedges. 27160 proven. 6185 refuted. 0 times theorem prover too weak. 55428 trivial. 0 not checked. [2020-07-21 17:04:48,065 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [257074441] [2020-07-21 17:04:48,065 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 17:04:48,066 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20] total 31 [2020-07-21 17:04:48,066 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1856725228] [2020-07-21 17:04:48,067 INFO L459 AbstractCegarLoop]: Interpolant automaton has 31 states [2020-07-21 17:04:48,067 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 17:04:48,067 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2020-07-21 17:04:48,068 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=213, Invalid=717, Unknown=0, NotChecked=0, Total=930 [2020-07-21 17:04:48,068 INFO L87 Difference]: Start difference. First operand 837 states and 1106 transitions. Second operand 31 states. [2020-07-21 17:05:02,567 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 16 DAG size of output: 15 [2020-07-21 17:05:02,789 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 17 DAG size of output: 16 [2020-07-21 17:05:03,031 WARN L193 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 17 DAG size of output: 16 [2020-07-21 17:05:03,522 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 18 DAG size of output: 17 [2020-07-21 17:05:03,790 WARN L193 SmtUtils]: Spent 117.00 ms on a formula simplification. DAG size of input: 18 DAG size of output: 17 [2020-07-21 17:05:04,058 WARN L193 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 18 DAG size of output: 17 [2020-07-21 17:05:04,364 WARN L193 SmtUtils]: Spent 115.00 ms on a formula simplification. DAG size of input: 17 DAG size of output: 16 [2020-07-21 17:05:04,892 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 17:05:04,892 INFO L93 Difference]: Finished difference Result 1138 states and 1536 transitions. [2020-07-21 17:05:04,895 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 73 states. [2020-07-21 17:05:04,896 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 1193 [2020-07-21 17:05:04,897 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 17:05:04,900 INFO L225 Difference]: With dead ends: 1138 [2020-07-21 17:05:04,900 INFO L226 Difference]: Without dead ends: 837 [2020-07-21 17:05:04,903 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2457 GetRequests, 2356 SyntacticMatches, 7 SemanticMatches, 94 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2077 ImplicationChecksByTransitivity, 12.7s TimeCoverageRelationStatistics Valid=2584, Invalid=6536, Unknown=0, NotChecked=0, Total=9120 [2020-07-21 17:05:04,904 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 837 states. [2020-07-21 17:05:05,121 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 837 to 837. [2020-07-21 17:05:05,122 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 837 states. [2020-07-21 17:05:05,124 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 837 states to 837 states and 1104 transitions. [2020-07-21 17:05:05,124 INFO L78 Accepts]: Start accepts. Automaton has 837 states and 1104 transitions. Word has length 1193 [2020-07-21 17:05:05,125 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 17:05:05,125 INFO L479 AbstractCegarLoop]: Abstraction has 837 states and 1104 transitions. [2020-07-21 17:05:05,125 INFO L480 AbstractCegarLoop]: Interpolant automaton has 31 states. [2020-07-21 17:05:05,125 INFO L276 IsEmpty]: Start isEmpty. Operand 837 states and 1104 transitions. [2020-07-21 17:05:05,136 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1201 [2020-07-21 17:05:05,136 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 17:05:05,136 INFO L422 BasicCegarLoop]: trace histogram [157, 157, 157, 156, 156, 156, 156, 24, 23, 23, 8, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 17:05:05,337 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 50 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 17:05:05,337 INFO L427 AbstractCegarLoop]: === Iteration 50 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 17:05:05,338 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 17:05:05,339 INFO L82 PathProgramCache]: Analyzing trace with hash 1739494104, now seen corresponding path program 47 times [2020-07-21 17:05:05,339 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 17:05:05,339 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [963173123] [2020-07-21 17:05:05,340 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 51 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 51 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 17:05:05,693 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 17:05:05,694 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 17:05:05,706 INFO L263 TraceCheckSpWp]: Trace formula consists of 2103 conjuncts, 23 conjunts are in the unsatisfiable core [2020-07-21 17:05:05,717 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 17:05:08,938 INFO L134 CoverageAnalysis]: Checked inductivity of 89885 backedges. 7019 proven. 30608 refuted. 0 times theorem prover too weak. 52258 trivial. 0 not checked. [2020-07-21 17:05:08,939 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 17:05:16,760 INFO L134 CoverageAnalysis]: Checked inductivity of 89885 backedges. 3430 proven. 30609 refuted. 0 times theorem prover too weak. 55846 trivial. 0 not checked. [2020-07-21 17:05:16,761 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [963173123] [2020-07-21 17:05:16,761 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 17:05:16,761 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24] total 38 [2020-07-21 17:05:16,762 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1844932742] [2020-07-21 17:05:16,763 INFO L459 AbstractCegarLoop]: Interpolant automaton has 38 states [2020-07-21 17:05:16,763 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 17:05:16,763 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2020-07-21 17:05:16,763 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=265, Invalid=1141, Unknown=0, NotChecked=0, Total=1406 [2020-07-21 17:05:16,763 INFO L87 Difference]: Start difference. First operand 837 states and 1104 transitions. Second operand 38 states. [2020-07-21 17:05:17,344 WARN L193 SmtUtils]: Spent 111.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 16 [2020-07-21 17:05:17,606 WARN L193 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 20 DAG size of output: 16 [2020-07-21 17:05:17,861 WARN L193 SmtUtils]: Spent 119.00 ms on a formula simplification. DAG size of input: 25 DAG size of output: 17 [2020-07-21 17:05:18,128 WARN L193 SmtUtils]: Spent 135.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 18 [2020-07-21 17:05:18,484 WARN L193 SmtUtils]: Spent 111.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 16 [2020-07-21 17:05:18,740 WARN L193 SmtUtils]: Spent 112.00 ms on a formula simplification. DAG size of input: 20 DAG size of output: 15 [2020-07-21 17:05:19,021 WARN L193 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 20 DAG size of output: 16 [2020-07-21 17:05:19,279 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 25 DAG size of output: 17 [2020-07-21 17:05:19,605 WARN L193 SmtUtils]: Spent 183.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 22 [2020-07-21 17:05:20,044 WARN L193 SmtUtils]: Spent 208.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 23 [2020-07-21 17:05:20,436 WARN L193 SmtUtils]: Spent 211.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 23 [2020-07-21 17:05:20,818 WARN L193 SmtUtils]: Spent 213.00 ms on a formula simplification. DAG size of input: 30 DAG size of output: 23 [2020-07-21 17:05:21,089 WARN L193 SmtUtils]: Spent 141.00 ms on a formula simplification. DAG size of input: 24 DAG size of output: 18 [2020-07-21 17:05:21,398 WARN L193 SmtUtils]: Spent 142.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 18 [2020-07-21 17:05:21,815 WARN L193 SmtUtils]: Spent 129.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 17 [2020-07-21 17:05:22,108 WARN L193 SmtUtils]: Spent 129.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 16 [2020-07-21 17:05:22,375 WARN L193 SmtUtils]: Spent 126.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 16 [2020-07-21 17:05:22,660 WARN L193 SmtUtils]: Spent 118.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 17 [2020-07-21 17:05:22,972 WARN L193 SmtUtils]: Spent 127.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 18 [2020-07-21 17:05:23,379 WARN L193 SmtUtils]: Spent 210.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 22 [2020-07-21 17:05:23,817 WARN L193 SmtUtils]: Spent 214.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 23 [2020-07-21 17:05:24,184 WARN L193 SmtUtils]: Spent 210.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 23 [2020-07-21 17:05:24,553 WARN L193 SmtUtils]: Spent 217.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 23 [2020-07-21 17:05:24,980 WARN L193 SmtUtils]: Spent 239.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 24 [2020-07-21 17:05:25,270 WARN L193 SmtUtils]: Spent 143.00 ms on a formula simplification. DAG size of input: 25 DAG size of output: 19 [2020-07-21 17:05:25,657 WARN L193 SmtUtils]: Spent 208.00 ms on a formula simplification. DAG size of input: 30 DAG size of output: 21 [2020-07-21 17:05:26,150 WARN L193 SmtUtils]: Spent 220.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 23 [2020-07-21 17:05:26,580 WARN L193 SmtUtils]: Spent 213.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 22 [2020-07-21 17:05:27,010 WARN L193 SmtUtils]: Spent 219.00 ms on a formula simplification. DAG size of input: 30 DAG size of output: 22 [2020-07-21 17:05:27,412 WARN L193 SmtUtils]: Spent 213.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 23 [2020-07-21 17:05:27,850 WARN L193 SmtUtils]: Spent 212.00 ms on a formula simplification. DAG size of input: 30 DAG size of output: 23 [2020-07-21 17:05:28,225 WARN L193 SmtUtils]: Spent 135.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 20 [2020-07-21 17:05:28,595 WARN L193 SmtUtils]: Spent 139.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 19 [2020-07-21 17:05:29,036 WARN L193 SmtUtils]: Spent 122.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 17 [2020-07-21 17:05:29,358 WARN L193 SmtUtils]: Spent 126.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 16 [2020-07-21 17:05:29,637 WARN L193 SmtUtils]: Spent 117.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 17 [2020-07-21 17:05:29,925 WARN L193 SmtUtils]: Spent 123.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 16 [2020-07-21 17:05:30,233 WARN L193 SmtUtils]: Spent 121.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 17 [2020-07-21 17:05:30,565 WARN L193 SmtUtils]: Spent 130.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 18 [2020-07-21 17:05:31,000 WARN L193 SmtUtils]: Spent 208.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 23 [2020-07-21 17:05:31,474 WARN L193 SmtUtils]: Spent 207.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 24 [2020-07-21 17:05:31,896 WARN L193 SmtUtils]: Spent 211.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 24 [2020-07-21 17:05:32,293 WARN L193 SmtUtils]: Spent 218.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 24 [2020-07-21 17:05:32,686 WARN L193 SmtUtils]: Spent 221.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 24 [2020-07-21 17:05:33,080 WARN L193 SmtUtils]: Spent 210.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 25 [2020-07-21 17:05:33,405 WARN L193 SmtUtils]: Spent 159.00 ms on a formula simplification. DAG size of input: 25 DAG size of output: 19 [2020-07-21 17:05:33,812 WARN L193 SmtUtils]: Spent 209.00 ms on a formula simplification. DAG size of input: 30 DAG size of output: 22 [2020-07-21 17:05:34,309 WARN L193 SmtUtils]: Spent 212.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 24 [2020-07-21 17:05:34,779 WARN L193 SmtUtils]: Spent 215.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 23 [2020-07-21 17:05:35,255 WARN L193 SmtUtils]: Spent 222.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 23 [2020-07-21 17:05:35,690 WARN L193 SmtUtils]: Spent 221.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 23 [2020-07-21 17:05:36,113 WARN L193 SmtUtils]: Spent 213.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 24 [2020-07-21 17:05:36,594 WARN L193 SmtUtils]: Spent 221.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 24 [2020-07-21 17:05:36,947 WARN L193 SmtUtils]: Spent 123.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 18 [2020-07-21 17:05:40,464 WARN L193 SmtUtils]: Spent 130.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 17 [2020-07-21 17:05:40,799 WARN L193 SmtUtils]: Spent 134.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 16 [2020-07-21 17:05:41,102 WARN L193 SmtUtils]: Spent 122.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 17 [2020-07-21 17:05:41,400 WARN L193 SmtUtils]: Spent 126.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 17 [2020-07-21 17:05:41,698 WARN L193 SmtUtils]: Spent 128.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 16 [2020-07-21 17:05:42,012 WARN L193 SmtUtils]: Spent 137.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 17 [2020-07-21 17:05:42,337 WARN L193 SmtUtils]: Spent 130.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 18 [2020-07-21 17:05:42,738 WARN L193 SmtUtils]: Spent 169.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 23 [2020-07-21 17:05:43,208 WARN L193 SmtUtils]: Spent 197.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 24 [2020-07-21 17:05:43,634 WARN L193 SmtUtils]: Spent 204.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 24 [2020-07-21 17:05:44,042 WARN L193 SmtUtils]: Spent 198.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 24 [2020-07-21 17:05:44,431 WARN L193 SmtUtils]: Spent 196.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 25 [2020-07-21 17:05:44,795 WARN L193 SmtUtils]: Spent 196.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 24 [2020-07-21 17:05:45,176 WARN L193 SmtUtils]: Spent 193.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 25 [2020-07-21 17:05:45,477 WARN L193 SmtUtils]: Spent 138.00 ms on a formula simplification. DAG size of input: 25 DAG size of output: 19 [2020-07-21 17:05:45,904 WARN L193 SmtUtils]: Spent 196.00 ms on a formula simplification. DAG size of input: 30 DAG size of output: 22 [2020-07-21 17:05:46,396 WARN L193 SmtUtils]: Spent 195.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 24 [2020-07-21 17:05:46,842 WARN L193 SmtUtils]: Spent 196.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 23 [2020-07-21 17:05:47,344 WARN L193 SmtUtils]: Spent 214.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 23 [2020-07-21 17:05:47,808 WARN L193 SmtUtils]: Spent 213.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 24 [2020-07-21 17:05:48,241 WARN L193 SmtUtils]: Spent 218.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 23 [2020-07-21 17:05:48,678 WARN L193 SmtUtils]: Spent 225.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 24 [2020-07-21 17:05:49,149 WARN L193 SmtUtils]: Spent 225.00 ms on a formula simplification. DAG size of input: 30 DAG size of output: 24 [2020-07-21 17:05:49,513 WARN L193 SmtUtils]: Spent 118.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 18 [2020-07-21 17:05:57,755 WARN L193 SmtUtils]: Spent 129.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 17 [2020-07-21 17:05:58,116 WARN L193 SmtUtils]: Spent 126.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 16 [2020-07-21 17:05:58,473 WARN L193 SmtUtils]: Spent 137.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 17 [2020-07-21 17:05:58,805 WARN L193 SmtUtils]: Spent 131.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 17 [2020-07-21 17:05:59,116 WARN L193 SmtUtils]: Spent 126.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 17 [2020-07-21 17:05:59,440 WARN L193 SmtUtils]: Spent 136.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 16 [2020-07-21 17:05:59,796 WARN L193 SmtUtils]: Spent 141.00 ms on a formula simplification. DAG size of input: 20 DAG size of output: 17 [2020-07-21 17:06:00,161 WARN L193 SmtUtils]: Spent 137.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 18 [2020-07-21 17:06:00,658 WARN L193 SmtUtils]: Spent 215.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 23 [2020-07-21 17:06:01,195 WARN L193 SmtUtils]: Spent 225.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 24 [2020-07-21 17:06:01,678 WARN L193 SmtUtils]: Spent 232.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 24 [2020-07-21 17:06:02,172 WARN L193 SmtUtils]: Spent 220.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 24 [2020-07-21 17:06:02,628 WARN L193 SmtUtils]: Spent 222.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 25 [2020-07-21 17:06:03,077 WARN L193 SmtUtils]: Spent 225.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 25 [2020-07-21 17:06:03,507 WARN L193 SmtUtils]: Spent 224.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 24 [2020-07-21 17:06:03,952 WARN L193 SmtUtils]: Spent 231.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 25 [2020-07-21 17:06:04,314 WARN L193 SmtUtils]: Spent 156.00 ms on a formula simplification. DAG size of input: 25 DAG size of output: 19 [2020-07-21 17:06:04,827 WARN L193 SmtUtils]: Spent 221.00 ms on a formula simplification. DAG size of input: 30 DAG size of output: 22 [2020-07-21 17:06:05,431 WARN L193 SmtUtils]: Spent 221.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 24 [2020-07-21 17:06:05,998 WARN L193 SmtUtils]: Spent 231.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 23 [2020-07-21 17:06:06,563 WARN L193 SmtUtils]: Spent 224.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 23 [2020-07-21 17:06:07,113 WARN L193 SmtUtils]: Spent 221.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 24 [2020-07-21 17:06:07,651 WARN L193 SmtUtils]: Spent 217.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 24 [2020-07-21 17:06:08,138 WARN L193 SmtUtils]: Spent 221.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 23 [2020-07-21 17:06:08,622 WARN L193 SmtUtils]: Spent 222.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 24 [2020-07-21 17:06:09,125 WARN L193 SmtUtils]: Spent 217.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 24 [2020-07-21 17:06:09,544 WARN L193 SmtUtils]: Spent 121.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 18 [2020-07-21 17:06:14,604 WARN L193 SmtUtils]: Spent 127.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 17 [2020-07-21 17:06:14,985 WARN L193 SmtUtils]: Spent 133.00 ms on a formula simplification. DAG size of input: 19 DAG size of output: 16 [2020-07-21 17:06:15,347 WARN L193 SmtUtils]: Spent 127.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 17 [2020-07-21 17:06:15,713 WARN L193 SmtUtils]: Spent 131.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 17 [2020-07-21 17:06:16,047 WARN L193 SmtUtils]: Spent 127.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 17 [2020-07-21 17:06:16,370 WARN L193 SmtUtils]: Spent 126.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 17 [2020-07-21 17:06:16,704 WARN L193 SmtUtils]: Spent 131.00 ms on a formula simplification. DAG size of input: 19 DAG size of output: 16 [2020-07-21 17:06:17,031 WARN L193 SmtUtils]: Spent 128.00 ms on a formula simplification. DAG size of input: 19 DAG size of output: 17 [2020-07-21 17:06:17,388 WARN L193 SmtUtils]: Spent 121.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 18 [2020-07-21 17:06:17,906 WARN L193 SmtUtils]: Spent 213.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 23 [2020-07-21 17:06:18,478 WARN L193 SmtUtils]: Spent 212.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 24 [2020-07-21 17:06:19,019 WARN L193 SmtUtils]: Spent 219.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 24 [2020-07-21 17:06:19,549 WARN L193 SmtUtils]: Spent 212.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 24 [2020-07-21 17:06:20,057 WARN L193 SmtUtils]: Spent 209.00 ms on a formula simplification. DAG size of input: 29 DAG size of output: 25 [2020-07-21 17:06:20,561 WARN L193 SmtUtils]: Spent 206.00 ms on a formula simplification. DAG size of input: 29 DAG size of output: 25 [2020-07-21 17:06:21,013 WARN L193 SmtUtils]: Spent 212.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 25 [2020-07-21 17:06:21,479 WARN L193 SmtUtils]: Spent 206.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 24 [2020-07-21 17:06:21,956 WARN L193 SmtUtils]: Spent 227.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 25 [2020-07-21 17:06:22,328 WARN L193 SmtUtils]: Spent 144.00 ms on a formula simplification. DAG size of input: 20 DAG size of output: 19 [2020-07-21 17:06:22,793 WARN L193 SmtUtils]: Spent 196.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 22 [2020-07-21 17:06:23,090 WARN L193 SmtUtils]: Spent 141.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 17 [2020-07-21 17:06:23,357 WARN L193 SmtUtils]: Spent 133.00 ms on a formula simplification. DAG size of input: 20 DAG size of output: 17 [2020-07-21 17:06:23,955 WARN L193 SmtUtils]: Spent 214.00 ms on a formula simplification. DAG size of input: 25 DAG size of output: 24 [2020-07-21 17:06:24,464 WARN L193 SmtUtils]: Spent 204.00 ms on a formula simplification. DAG size of input: 24 DAG size of output: 23 [2020-07-21 17:06:25,002 WARN L193 SmtUtils]: Spent 212.00 ms on a formula simplification. DAG size of input: 24 DAG size of output: 23 [2020-07-21 17:06:25,507 WARN L193 SmtUtils]: Spent 216.00 ms on a formula simplification. DAG size of input: 25 DAG size of output: 24 [2020-07-21 17:06:26,017 WARN L193 SmtUtils]: Spent 214.00 ms on a formula simplification. DAG size of input: 25 DAG size of output: 24 [2020-07-21 17:06:26,504 WARN L193 SmtUtils]: Spent 213.00 ms on a formula simplification. DAG size of input: 25 DAG size of output: 24 [2020-07-21 17:06:26,958 WARN L193 SmtUtils]: Spent 209.00 ms on a formula simplification. DAG size of input: 24 DAG size of output: 23 [2020-07-21 17:06:27,410 WARN L193 SmtUtils]: Spent 204.00 ms on a formula simplification. DAG size of input: 25 DAG size of output: 24 [2020-07-21 17:06:27,802 WARN L193 SmtUtils]: Spent 237.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 25 [2020-07-21 17:06:28,689 WARN L193 SmtUtils]: Spent 208.00 ms on a formula simplification. DAG size of input: 25 DAG size of output: 24 [2020-07-21 17:06:29,863 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 17:06:29,863 INFO L93 Difference]: Finished difference Result 1314 states and 1782 transitions. [2020-07-21 17:06:29,872 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 200 states. [2020-07-21 17:06:29,873 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 1200 [2020-07-21 17:06:29,874 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 17:06:29,881 INFO L225 Difference]: With dead ends: 1314 [2020-07-21 17:06:29,882 INFO L226 Difference]: Without dead ends: 1000 [2020-07-21 17:06:29,892 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2592 GetRequests, 2355 SyntacticMatches, 8 SemanticMatches, 229 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 23317 ImplicationChecksByTransitivity, 60.7s TimeCoverageRelationStatistics Valid=9982, Invalid=43148, Unknown=0, NotChecked=0, Total=53130 [2020-07-21 17:06:29,893 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1000 states. [2020-07-21 17:06:30,173 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1000 to 867. [2020-07-21 17:06:30,174 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 867 states. [2020-07-21 17:06:30,179 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 867 states to 867 states and 1144 transitions. [2020-07-21 17:06:30,180 INFO L78 Accepts]: Start accepts. Automaton has 867 states and 1144 transitions. Word has length 1200 [2020-07-21 17:06:30,181 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 17:06:30,181 INFO L479 AbstractCegarLoop]: Abstraction has 867 states and 1144 transitions. [2020-07-21 17:06:30,181 INFO L480 AbstractCegarLoop]: Interpolant automaton has 38 states. [2020-07-21 17:06:30,181 INFO L276 IsEmpty]: Start isEmpty. Operand 867 states and 1144 transitions. [2020-07-21 17:06:30,196 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1260 [2020-07-21 17:06:30,196 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 17:06:30,197 INFO L422 BasicCegarLoop]: trace histogram [165, 165, 165, 164, 164, 164, 164, 25, 24, 24, 8, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 17:06:30,397 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 51 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 17:06:30,398 INFO L427 AbstractCegarLoop]: === Iteration 51 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 17:06:30,399 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 17:06:30,400 INFO L82 PathProgramCache]: Analyzing trace with hash -891846805, now seen corresponding path program 48 times [2020-07-21 17:06:30,400 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 17:06:30,400 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1402848735] [2020-07-21 17:06:30,401 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 52 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 52 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 17:06:30,775 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 17:06:30,775 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 17:06:30,784 INFO L263 TraceCheckSpWp]: Trace formula consists of 2205 conjuncts, 21 conjunts are in the unsatisfiable core [2020-07-21 17:06:30,797 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 17:06:33,756 INFO L134 CoverageAnalysis]: Checked inductivity of 99275 backedges. 43091 proven. 3850 refuted. 0 times theorem prover too weak. 52334 trivial. 0 not checked. [2020-07-21 17:06:33,757 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 17:06:42,321 INFO L134 CoverageAnalysis]: Checked inductivity of 99275 backedges. 27808 proven. 10223 refuted. 0 times theorem prover too weak. 61244 trivial. 0 not checked. [2020-07-21 17:06:42,322 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1402848735] [2020-07-21 17:06:42,322 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 17:06:42,323 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22] total 35 [2020-07-21 17:06:42,323 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1626507816] [2020-07-21 17:06:42,324 INFO L459 AbstractCegarLoop]: Interpolant automaton has 35 states [2020-07-21 17:06:42,324 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 17:06:42,325 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2020-07-21 17:06:42,325 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=264, Invalid=926, Unknown=0, NotChecked=0, Total=1190 [2020-07-21 17:06:42,325 INFO L87 Difference]: Start difference. First operand 867 states and 1144 transitions. Second operand 35 states. [2020-07-21 17:07:02,904 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 15 DAG size of output: 14 [2020-07-21 17:07:03,136 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 17 DAG size of output: 16 [2020-07-21 17:07:03,387 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 16 DAG size of output: 15 [2020-07-21 17:07:05,796 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 17:07:05,796 INFO L93 Difference]: Finished difference Result 1168 states and 1573 transitions. [2020-07-21 17:07:05,803 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 94 states. [2020-07-21 17:07:05,803 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 1259 [2020-07-21 17:07:05,805 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 17:07:05,811 INFO L225 Difference]: With dead ends: 1168 [2020-07-21 17:07:05,812 INFO L226 Difference]: Without dead ends: 867 [2020-07-21 17:07:05,815 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2609 GetRequests, 2484 SyntacticMatches, 7 SemanticMatches, 118 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3533 ImplicationChecksByTransitivity, 19.4s TimeCoverageRelationStatistics Valid=3982, Invalid=10298, Unknown=0, NotChecked=0, Total=14280 [2020-07-21 17:07:05,816 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 867 states. [2020-07-21 17:07:06,065 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 867 to 867. [2020-07-21 17:07:06,066 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 867 states. [2020-07-21 17:07:06,068 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 867 states to 867 states and 1142 transitions. [2020-07-21 17:07:06,069 INFO L78 Accepts]: Start accepts. Automaton has 867 states and 1142 transitions. Word has length 1259 [2020-07-21 17:07:06,073 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 17:07:06,073 INFO L479 AbstractCegarLoop]: Abstraction has 867 states and 1142 transitions. [2020-07-21 17:07:06,073 INFO L480 AbstractCegarLoop]: Interpolant automaton has 35 states. [2020-07-21 17:07:06,074 INFO L276 IsEmpty]: Start isEmpty. Operand 867 states and 1142 transitions. [2020-07-21 17:07:06,089 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1267 [2020-07-21 17:07:06,090 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 17:07:06,090 INFO L422 BasicCegarLoop]: trace histogram [166, 166, 166, 165, 165, 165, 165, 25, 24, 24, 8, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 17:07:06,291 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 52 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 17:07:06,291 INFO L427 AbstractCegarLoop]: === Iteration 52 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 17:07:06,292 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 17:07:06,292 INFO L82 PathProgramCache]: Analyzing trace with hash -1524872590, now seen corresponding path program 49 times [2020-07-21 17:07:06,293 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 17:07:06,293 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1101573510] [2020-07-21 17:07:06,294 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 53 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 53 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 17:07:06,657 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 17:07:06,658 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 17:07:06,672 INFO L263 TraceCheckSpWp]: Trace formula consists of 2217 conjuncts, 25 conjunts are in the unsatisfiable core [2020-07-21 17:07:06,684 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 17:07:10,797 INFO L134 CoverageAnalysis]: Checked inductivity of 100451 backedges. 6358 proven. 35576 refuted. 0 times theorem prover too weak. 58517 trivial. 0 not checked. [2020-07-21 17:07:10,797 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 17:07:20,443 INFO L134 CoverageAnalysis]: Checked inductivity of 100451 backedges. 3167 proven. 35577 refuted. 0 times theorem prover too weak. 61707 trivial. 0 not checked. [2020-07-21 17:07:20,444 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1101573510] [2020-07-21 17:07:20,444 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 17:07:20,444 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26] total 42 [2020-07-21 17:07:20,445 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [853397256] [2020-07-21 17:07:20,446 INFO L459 AbstractCegarLoop]: Interpolant automaton has 42 states [2020-07-21 17:07:20,446 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 17:07:20,446 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2020-07-21 17:07:20,447 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=315, Invalid=1407, Unknown=0, NotChecked=0, Total=1722 [2020-07-21 17:07:20,447 INFO L87 Difference]: Start difference. First operand 867 states and 1142 transitions. Second operand 42 states. [2020-07-21 17:07:21,230 WARN L193 SmtUtils]: Spent 151.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 17 [2020-07-21 17:07:21,560 WARN L193 SmtUtils]: Spent 144.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 17 [2020-07-21 17:07:21,942 WARN L193 SmtUtils]: Spent 181.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 20 [2020-07-21 17:07:22,294 WARN L193 SmtUtils]: Spent 173.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 19 [2020-07-21 17:07:22,752 WARN L193 SmtUtils]: Spent 142.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 17 [2020-07-21 17:07:23,083 WARN L193 SmtUtils]: Spent 149.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 16 [2020-07-21 17:07:23,417 WARN L193 SmtUtils]: Spent 142.00 ms on a formula simplification. DAG size of input: 20 DAG size of output: 16 [2020-07-21 17:07:23,825 WARN L193 SmtUtils]: Spent 180.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 20 [2020-07-21 17:07:24,256 WARN L193 SmtUtils]: Spent 245.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 23 [2020-07-21 17:07:24,743 WARN L193 SmtUtils]: Spent 255.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 23 [2020-07-21 17:07:25,209 WARN L193 SmtUtils]: Spent 257.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 23 [2020-07-21 17:07:25,695 WARN L193 SmtUtils]: Spent 258.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 24 [2020-07-21 17:07:26,098 WARN L193 SmtUtils]: Spent 157.00 ms on a formula simplification. DAG size of input: 25 DAG size of output: 17 [2020-07-21 17:07:26,440 WARN L193 SmtUtils]: Spent 150.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 16 [2020-07-21 17:07:26,953 WARN L193 SmtUtils]: Spent 152.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 17 [2020-07-21 17:07:27,301 WARN L193 SmtUtils]: Spent 144.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 16 [2020-07-21 17:07:27,724 WARN L193 SmtUtils]: Spent 151.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 17 [2020-07-21 17:07:28,108 WARN L193 SmtUtils]: Spent 167.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 20 [2020-07-21 17:07:28,578 WARN L193 SmtUtils]: Spent 247.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 23 [2020-07-21 17:07:29,095 WARN L193 SmtUtils]: Spent 255.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 23 [2020-07-21 17:07:29,547 WARN L193 SmtUtils]: Spent 256.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 23 [2020-07-21 17:07:29,983 WARN L193 SmtUtils]: Spent 254.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 24 [2020-07-21 17:07:30,485 WARN L193 SmtUtils]: Spent 269.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 24 [2020-07-21 17:07:30,909 WARN L193 SmtUtils]: Spent 138.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 18 [2020-07-21 17:07:31,360 WARN L193 SmtUtils]: Spent 256.00 ms on a formula simplification. DAG size of input: 30 DAG size of output: 21 [2020-07-21 17:07:31,907 WARN L193 SmtUtils]: Spent 238.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 23 [2020-07-21 17:07:32,423 WARN L193 SmtUtils]: Spent 253.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 22 [2020-07-21 17:07:32,894 WARN L193 SmtUtils]: Spent 258.00 ms on a formula simplification. DAG size of input: 30 DAG size of output: 22 [2020-07-21 17:07:33,347 WARN L193 SmtUtils]: Spent 246.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 23 [2020-07-21 17:07:33,775 WARN L193 SmtUtils]: Spent 238.00 ms on a formula simplification. DAG size of input: 30 DAG size of output: 23 [2020-07-21 17:07:34,121 WARN L193 SmtUtils]: Spent 155.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 20 [2020-07-21 17:07:34,509 WARN L193 SmtUtils]: Spent 156.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 21 [2020-07-21 17:07:34,997 WARN L193 SmtUtils]: Spent 128.00 ms on a formula simplification. DAG size of input: 24 DAG size of output: 18 [2020-07-21 17:07:35,362 WARN L193 SmtUtils]: Spent 146.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 17 [2020-07-21 17:07:35,656 WARN L193 SmtUtils]: Spent 121.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 17 [2020-07-21 17:07:36,000 WARN L193 SmtUtils]: Spent 152.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 17 [2020-07-21 17:07:36,341 WARN L193 SmtUtils]: Spent 142.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 18 [2020-07-21 17:07:36,976 WARN L193 SmtUtils]: Spent 246.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 24 [2020-07-21 17:07:37,526 WARN L193 SmtUtils]: Spent 248.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 24 [2020-07-21 17:07:38,007 WARN L193 SmtUtils]: Spent 255.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 24 [2020-07-21 17:07:38,480 WARN L193 SmtUtils]: Spent 260.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 24 [2020-07-21 17:07:38,938 WARN L193 SmtUtils]: Spent 254.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 25 [2020-07-21 17:07:39,455 WARN L193 SmtUtils]: Spent 261.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 25 [2020-07-21 17:07:39,899 WARN L193 SmtUtils]: Spent 159.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 19 [2020-07-21 17:07:40,459 WARN L193 SmtUtils]: Spent 266.00 ms on a formula simplification. DAG size of input: 30 DAG size of output: 22 [2020-07-21 17:07:41,034 WARN L193 SmtUtils]: Spent 266.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 24 [2020-07-21 17:07:41,572 WARN L193 SmtUtils]: Spent 253.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 23 [2020-07-21 17:07:42,089 WARN L193 SmtUtils]: Spent 274.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 23 [2020-07-21 17:07:42,585 WARN L193 SmtUtils]: Spent 263.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 23 [2020-07-21 17:07:43,071 WARN L193 SmtUtils]: Spent 265.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 24 [2020-07-21 17:07:43,544 WARN L193 SmtUtils]: Spent 247.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 24 [2020-07-21 17:07:43,885 WARN L193 SmtUtils]: Spent 165.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 21 [2020-07-21 17:07:44,427 WARN L193 SmtUtils]: Spent 280.00 ms on a formula simplification. DAG size of input: 30 DAG size of output: 22 [2020-07-21 17:07:45,053 WARN L193 SmtUtils]: Spent 248.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 24 [2020-07-21 17:07:45,631 WARN L193 SmtUtils]: Spent 268.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 23 [2020-07-21 17:07:46,204 WARN L193 SmtUtils]: Spent 266.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 23 [2020-07-21 17:07:46,781 WARN L193 SmtUtils]: Spent 277.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 23 [2020-07-21 17:07:47,339 WARN L193 SmtUtils]: Spent 286.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 24 [2020-07-21 17:07:47,864 WARN L193 SmtUtils]: Spent 268.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 24 [2020-07-21 17:07:48,433 WARN L193 SmtUtils]: Spent 269.00 ms on a formula simplification. DAG size of input: 30 DAG size of output: 24 [2020-07-21 17:07:48,924 WARN L193 SmtUtils]: Spent 141.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 18 [2020-07-21 17:07:49,391 WARN L193 SmtUtils]: Spent 143.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 18 [2020-07-21 17:07:49,944 WARN L193 SmtUtils]: Spent 156.00 ms on a formula simplification. DAG size of input: 24 DAG size of output: 18 [2020-07-21 17:07:50,364 WARN L193 SmtUtils]: Spent 148.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 17 [2020-07-21 17:07:50,742 WARN L193 SmtUtils]: Spent 153.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 17 [2020-07-21 17:07:51,086 WARN L193 SmtUtils]: Spent 148.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 18 [2020-07-21 17:07:51,416 WARN L193 SmtUtils]: Spent 148.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 17 [2020-07-21 17:07:51,778 WARN L193 SmtUtils]: Spent 147.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 18 [2020-07-21 17:07:52,198 WARN L193 SmtUtils]: Spent 186.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 21 [2020-07-21 17:07:52,726 WARN L193 SmtUtils]: Spent 254.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 24 [2020-07-21 17:07:53,256 WARN L193 SmtUtils]: Spent 238.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 24 [2020-07-21 17:07:53,736 WARN L193 SmtUtils]: Spent 237.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 24 [2020-07-21 17:07:54,210 WARN L193 SmtUtils]: Spent 246.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 25 [2020-07-21 17:07:54,648 WARN L193 SmtUtils]: Spent 237.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 24 [2020-07-21 17:07:55,053 WARN L193 SmtUtils]: Spent 219.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 25 [2020-07-21 17:07:55,526 WARN L193 SmtUtils]: Spent 240.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 25 [2020-07-21 17:07:55,927 WARN L193 SmtUtils]: Spent 141.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 19 [2020-07-21 17:07:56,511 WARN L193 SmtUtils]: Spent 286.00 ms on a formula simplification. DAG size of input: 30 DAG size of output: 22 [2020-07-21 17:07:57,165 WARN L193 SmtUtils]: Spent 284.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 24 [2020-07-21 17:07:57,749 WARN L193 SmtUtils]: Spent 270.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 23 [2020-07-21 17:07:58,334 WARN L193 SmtUtils]: Spent 284.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 23 [2020-07-21 17:07:58,879 WARN L193 SmtUtils]: Spent 264.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 24 [2020-07-21 17:07:59,421 WARN L193 SmtUtils]: Spent 265.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 23 [2020-07-21 17:07:59,940 WARN L193 SmtUtils]: Spent 276.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 24 [2020-07-21 17:08:00,444 WARN L193 SmtUtils]: Spent 270.00 ms on a formula simplification. DAG size of input: 30 DAG size of output: 24 [2020-07-21 17:08:00,857 WARN L193 SmtUtils]: Spent 177.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 21 [2020-07-21 17:08:01,431 WARN L193 SmtUtils]: Spent 256.00 ms on a formula simplification. DAG size of input: 30 DAG size of output: 22 [2020-07-21 17:08:02,016 WARN L193 SmtUtils]: Spent 223.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 24 [2020-07-21 17:08:02,665 WARN L193 SmtUtils]: Spent 267.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 23 [2020-07-21 17:08:03,259 WARN L193 SmtUtils]: Spent 263.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 23 [2020-07-21 17:08:03,837 WARN L193 SmtUtils]: Spent 249.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 24 [2020-07-21 17:08:04,400 WARN L193 SmtUtils]: Spent 245.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 23 [2020-07-21 17:08:04,922 WARN L193 SmtUtils]: Spent 254.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 24 [2020-07-21 17:08:05,427 WARN L193 SmtUtils]: Spent 237.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 24 [2020-07-21 17:08:05,956 WARN L193 SmtUtils]: Spent 252.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 24 [2020-07-21 17:08:06,380 WARN L193 SmtUtils]: Spent 125.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 18 [2020-07-21 17:08:07,417 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 18 [2020-07-21 17:08:11,548 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 16 [2020-07-21 17:08:12,651 WARN L193 SmtUtils]: Spent 149.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 18 [2020-07-21 17:08:13,065 WARN L193 SmtUtils]: Spent 150.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 17 [2020-07-21 17:08:13,473 WARN L193 SmtUtils]: Spent 155.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 17 [2020-07-21 17:08:13,872 WARN L193 SmtUtils]: Spent 150.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 18 [2020-07-21 17:08:14,234 WARN L193 SmtUtils]: Spent 152.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 18 [2020-07-21 17:08:14,616 WARN L193 SmtUtils]: Spent 152.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 17 [2020-07-21 17:08:15,014 WARN L193 SmtUtils]: Spent 159.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 18 [2020-07-21 17:08:15,471 WARN L193 SmtUtils]: Spent 178.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 21 [2020-07-21 17:08:16,034 WARN L193 SmtUtils]: Spent 277.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 24 [2020-07-21 17:08:16,539 WARN L193 SmtUtils]: Spent 181.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 24 [2020-07-21 17:08:16,983 WARN L193 SmtUtils]: Spent 252.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 24 [2020-07-21 17:08:17,559 WARN L193 SmtUtils]: Spent 280.00 ms on a formula simplification. DAG size of input: 34 DAG size of output: 25 [2020-07-21 17:08:18,090 WARN L193 SmtUtils]: Spent 261.00 ms on a formula simplification. DAG size of input: 34 DAG size of output: 25 [2020-07-21 17:08:18,591 WARN L193 SmtUtils]: Spent 257.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 24 [2020-07-21 17:08:19,118 WARN L193 SmtUtils]: Spent 273.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 25 [2020-07-21 17:08:19,656 WARN L193 SmtUtils]: Spent 256.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 25 [2020-07-21 17:08:20,150 WARN L193 SmtUtils]: Spent 171.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 19 [2020-07-21 17:08:20,823 WARN L193 SmtUtils]: Spent 278.00 ms on a formula simplification. DAG size of input: 30 DAG size of output: 22 [2020-07-21 17:08:21,567 WARN L193 SmtUtils]: Spent 276.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 24 [2020-07-21 17:08:22,233 WARN L193 SmtUtils]: Spent 268.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 23 [2020-07-21 17:08:22,913 WARN L193 SmtUtils]: Spent 306.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 23 [2020-07-21 17:08:23,582 WARN L193 SmtUtils]: Spent 285.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 24 [2020-07-21 17:08:24,223 WARN L193 SmtUtils]: Spent 284.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 24 [2020-07-21 17:08:24,817 WARN L193 SmtUtils]: Spent 288.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 23 [2020-07-21 17:08:25,400 WARN L193 SmtUtils]: Spent 273.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 24 [2020-07-21 17:08:25,969 WARN L193 SmtUtils]: Spent 275.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 24 [2020-07-21 17:08:26,412 WARN L193 SmtUtils]: Spent 185.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 21 [2020-07-21 17:08:27,056 WARN L193 SmtUtils]: Spent 283.00 ms on a formula simplification. DAG size of input: 30 DAG size of output: 22 [2020-07-21 17:08:27,865 WARN L193 SmtUtils]: Spent 276.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 24 [2020-07-21 17:08:28,625 WARN L193 SmtUtils]: Spent 280.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 23 [2020-07-21 17:08:29,341 WARN L193 SmtUtils]: Spent 292.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 23 [2020-07-21 17:08:30,021 WARN L193 SmtUtils]: Spent 290.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 24 [2020-07-21 17:08:30,715 WARN L193 SmtUtils]: Spent 276.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 24 [2020-07-21 17:08:31,352 WARN L193 SmtUtils]: Spent 275.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 23 [2020-07-21 17:08:31,964 WARN L193 SmtUtils]: Spent 285.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 24 [2020-07-21 17:08:32,543 WARN L193 SmtUtils]: Spent 263.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 24 [2020-07-21 17:08:33,118 WARN L193 SmtUtils]: Spent 273.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 24 [2020-07-21 17:08:33,615 WARN L193 SmtUtils]: Spent 139.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 18 [2020-07-21 17:08:38,801 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 18 [2020-07-21 17:08:40,974 WARN L193 SmtUtils]: Spent 151.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 18 [2020-07-21 17:08:41,427 WARN L193 SmtUtils]: Spent 142.00 ms on a formula simplification. DAG size of input: 20 DAG size of output: 17 [2020-07-21 17:08:41,825 WARN L193 SmtUtils]: Spent 146.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 17 [2020-07-21 17:08:42,249 WARN L193 SmtUtils]: Spent 170.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 18 [2020-07-21 17:08:42,621 WARN L193 SmtUtils]: Spent 141.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 18 [2020-07-21 17:08:43,006 WARN L193 SmtUtils]: Spent 157.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 18 [2020-07-21 17:08:43,391 WARN L193 SmtUtils]: Spent 147.00 ms on a formula simplification. DAG size of input: 20 DAG size of output: 17 [2020-07-21 17:08:43,772 WARN L193 SmtUtils]: Spent 144.00 ms on a formula simplification. DAG size of input: 20 DAG size of output: 18 [2020-07-21 17:08:44,237 WARN L193 SmtUtils]: Spent 168.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 21 [2020-07-21 17:08:44,837 WARN L193 SmtUtils]: Spent 256.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 24 [2020-07-21 17:08:45,519 WARN L193 SmtUtils]: Spent 248.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 24 [2020-07-21 17:08:46,130 WARN L193 SmtUtils]: Spent 263.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 24 [2020-07-21 17:08:46,717 WARN L193 SmtUtils]: Spent 251.00 ms on a formula simplification. DAG size of input: 29 DAG size of output: 25 [2020-07-21 17:08:47,321 WARN L193 SmtUtils]: Spent 261.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 25 [2020-07-21 17:08:47,860 WARN L193 SmtUtils]: Spent 245.00 ms on a formula simplification. DAG size of input: 29 DAG size of output: 25 [2020-07-21 17:08:48,378 WARN L193 SmtUtils]: Spent 252.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 24 [2020-07-21 17:08:48,920 WARN L193 SmtUtils]: Spent 262.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 25 [2020-07-21 17:08:49,513 WARN L193 SmtUtils]: Spent 266.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 25 [2020-07-21 17:08:49,971 WARN L193 SmtUtils]: Spent 148.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 19 [2020-07-21 17:08:50,661 WARN L193 SmtUtils]: Spent 266.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 22 [2020-07-21 17:08:51,387 WARN L193 SmtUtils]: Spent 258.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 24 [2020-07-21 17:08:52,108 WARN L193 SmtUtils]: Spent 268.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 23 [2020-07-21 17:08:52,772 WARN L193 SmtUtils]: Spent 257.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 23 [2020-07-21 17:08:53,421 WARN L193 SmtUtils]: Spent 260.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 24 [2020-07-21 17:08:54,102 WARN L193 SmtUtils]: Spent 260.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 24 [2020-07-21 17:08:54,737 WARN L193 SmtUtils]: Spent 259.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 24 [2020-07-21 17:08:55,319 WARN L193 SmtUtils]: Spent 257.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 23 [2020-07-21 17:08:55,903 WARN L193 SmtUtils]: Spent 260.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 24 [2020-07-21 17:08:56,456 WARN L193 SmtUtils]: Spent 270.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 24 [2020-07-21 17:08:56,884 WARN L193 SmtUtils]: Spent 181.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 21 [2020-07-21 17:08:57,478 WARN L193 SmtUtils]: Spent 266.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 22 [2020-07-21 17:08:57,827 WARN L193 SmtUtils]: Spent 156.00 ms on a formula simplification. DAG size of input: 24 DAG size of output: 18 [2020-07-21 17:08:58,202 WARN L193 SmtUtils]: Spent 167.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 20 [2020-07-21 17:08:58,932 WARN L193 SmtUtils]: Spent 238.00 ms on a formula simplification. DAG size of input: 25 DAG size of output: 24 [2020-07-21 17:08:59,607 WARN L193 SmtUtils]: Spent 249.00 ms on a formula simplification. DAG size of input: 24 DAG size of output: 23 [2020-07-21 17:09:00,243 WARN L193 SmtUtils]: Spent 260.00 ms on a formula simplification. DAG size of input: 24 DAG size of output: 23 [2020-07-21 17:09:00,834 WARN L193 SmtUtils]: Spent 238.00 ms on a formula simplification. DAG size of input: 25 DAG size of output: 24 [2020-07-21 17:09:01,428 WARN L193 SmtUtils]: Spent 252.00 ms on a formula simplification. DAG size of input: 25 DAG size of output: 24 [2020-07-21 17:09:01,981 WARN L193 SmtUtils]: Spent 228.00 ms on a formula simplification. DAG size of input: 25 DAG size of output: 24 [2020-07-21 17:09:02,524 WARN L193 SmtUtils]: Spent 251.00 ms on a formula simplification. DAG size of input: 24 DAG size of output: 23 [2020-07-21 17:09:03,032 WARN L193 SmtUtils]: Spent 220.00 ms on a formula simplification. DAG size of input: 25 DAG size of output: 24 [2020-07-21 17:09:03,591 WARN L193 SmtUtils]: Spent 263.00 ms on a formula simplification. DAG size of input: 25 DAG size of output: 24 [2020-07-21 17:09:04,000 WARN L193 SmtUtils]: Spent 233.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 25 [2020-07-21 17:09:05,048 WARN L193 SmtUtils]: Spent 234.00 ms on a formula simplification. DAG size of input: 25 DAG size of output: 24 [2020-07-21 17:09:06,334 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 17:09:06,334 INFO L93 Difference]: Finished difference Result 1301 states and 1754 transitions. [2020-07-21 17:09:06,341 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 223 states. [2020-07-21 17:09:06,341 INFO L78 Accepts]: Start accepts. Automaton has 42 states. Word has length 1266 [2020-07-21 17:09:06,343 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 17:09:06,348 INFO L225 Difference]: With dead ends: 1301 [2020-07-21 17:09:06,348 INFO L226 Difference]: Without dead ends: 984 [2020-07-21 17:09:06,357 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2747 GetRequests, 2483 SyntacticMatches, 8 SemanticMatches, 256 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 29010 ImplicationChecksByTransitivity, 87.8s TimeCoverageRelationStatistics Valid=12036, Invalid=54270, Unknown=0, NotChecked=0, Total=66306 [2020-07-21 17:09:06,358 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 984 states. [2020-07-21 17:09:06,576 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 984 to 900. [2020-07-21 17:09:06,576 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 900 states. [2020-07-21 17:09:06,580 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 900 states to 900 states and 1186 transitions. [2020-07-21 17:09:06,580 INFO L78 Accepts]: Start accepts. Automaton has 900 states and 1186 transitions. Word has length 1266 [2020-07-21 17:09:06,582 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 17:09:06,582 INFO L479 AbstractCegarLoop]: Abstraction has 900 states and 1186 transitions. [2020-07-21 17:09:06,582 INFO L480 AbstractCegarLoop]: Interpolant automaton has 42 states. [2020-07-21 17:09:06,583 INFO L276 IsEmpty]: Start isEmpty. Operand 900 states and 1186 transitions. [2020-07-21 17:09:06,603 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1333 [2020-07-21 17:09:06,603 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 17:09:06,603 INFO L422 BasicCegarLoop]: trace histogram [175, 175, 175, 174, 174, 174, 174, 26, 25, 25, 8, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 17:09:06,804 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 53 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 17:09:06,805 INFO L427 AbstractCegarLoop]: === Iteration 53 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 17:09:06,805 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 17:09:06,806 INFO L82 PathProgramCache]: Analyzing trace with hash -719015028, now seen corresponding path program 50 times [2020-07-21 17:09:06,806 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 17:09:06,806 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1916363272] [2020-07-21 17:09:06,807 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 54 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 54 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 17:09:07,197 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 17:09:07,198 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 17:09:07,210 INFO L263 TraceCheckSpWp]: Trace formula consists of 2331 conjuncts, 23 conjunts are in the unsatisfiable core [2020-07-21 17:09:07,224 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 17:09:11,345 INFO L134 CoverageAnalysis]: Checked inductivity of 111605 backedges. 48431 proven. 4583 refuted. 0 times theorem prover too weak. 58591 trivial. 0 not checked. [2020-07-21 17:09:11,345 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 17:09:22,452 INFO L134 CoverageAnalysis]: Checked inductivity of 111605 backedges. 28763 proven. 14741 refuted. 0 times theorem prover too weak. 68101 trivial. 0 not checked. [2020-07-21 17:09:22,453 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1916363272] [2020-07-21 17:09:22,453 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 17:09:22,454 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24] total 39 [2020-07-21 17:09:22,454 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2097014782] [2020-07-21 17:09:22,455 INFO L459 AbstractCegarLoop]: Interpolant automaton has 39 states [2020-07-21 17:09:22,455 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 17:09:22,455 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2020-07-21 17:09:22,455 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=321, Invalid=1161, Unknown=0, NotChecked=0, Total=1482 [2020-07-21 17:09:22,456 INFO L87 Difference]: Start difference. First operand 900 states and 1186 transitions. Second operand 39 states. [2020-07-21 17:09:54,506 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 18 DAG size of output: 17 [2020-07-21 17:09:55,250 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 17:09:55,250 INFO L93 Difference]: Finished difference Result 1201 states and 1614 transitions. [2020-07-21 17:09:55,257 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 116 states. [2020-07-21 17:09:55,258 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 1332 [2020-07-21 17:09:55,258 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 17:09:55,264 INFO L225 Difference]: With dead ends: 1201 [2020-07-21 17:09:55,265 INFO L226 Difference]: Without dead ends: 900 [2020-07-21 17:09:55,268 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2776 GetRequests, 2626 SyntacticMatches, 7 SemanticMatches, 143 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5475 ImplicationChecksByTransitivity, 26.6s TimeCoverageRelationStatistics Valid=5748, Invalid=15132, Unknown=0, NotChecked=0, Total=20880 [2020-07-21 17:09:55,269 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 900 states. [2020-07-21 17:09:55,468 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 900 to 900. [2020-07-21 17:09:55,468 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 900 states. [2020-07-21 17:09:55,471 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 900 states to 900 states and 1184 transitions. [2020-07-21 17:09:55,472 INFO L78 Accepts]: Start accepts. Automaton has 900 states and 1184 transitions. Word has length 1332 [2020-07-21 17:09:55,473 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 17:09:55,474 INFO L479 AbstractCegarLoop]: Abstraction has 900 states and 1184 transitions. [2020-07-21 17:09:55,474 INFO L480 AbstractCegarLoop]: Interpolant automaton has 39 states. [2020-07-21 17:09:55,474 INFO L276 IsEmpty]: Start isEmpty. Operand 900 states and 1184 transitions. [2020-07-21 17:09:55,488 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1340 [2020-07-21 17:09:55,488 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 17:09:55,489 INFO L422 BasicCegarLoop]: trace histogram [176, 176, 176, 175, 175, 175, 175, 26, 25, 25, 8, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 17:09:55,690 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 54 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 17:09:55,690 INFO L427 AbstractCegarLoop]: === Iteration 54 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 17:09:55,691 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 17:09:55,691 INFO L82 PathProgramCache]: Analyzing trace with hash -78422223, now seen corresponding path program 51 times [2020-07-21 17:09:55,692 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 17:09:55,692 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1413841214] [2020-07-21 17:09:55,692 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 55 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 55 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 17:09:56,071 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 17:09:56,072 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 17:09:56,085 INFO L263 TraceCheckSpWp]: Trace formula consists of 2343 conjuncts, 27 conjunts are in the unsatisfiable core [2020-07-21 17:09:56,097 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 17:09:59,873 INFO L134 CoverageAnalysis]: Checked inductivity of 112852 backedges. 5589 proven. 41372 refuted. 0 times theorem prover too weak. 65891 trivial. 0 not checked. [2020-07-21 17:09:59,874 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 17:10:09,387 INFO L134 CoverageAnalysis]: Checked inductivity of 112852 backedges. 2860 proven. 41373 refuted. 0 times theorem prover too weak. 68619 trivial. 0 not checked. [2020-07-21 17:10:09,388 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1413841214] [2020-07-21 17:10:09,388 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 17:10:09,389 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 28] total 46 [2020-07-21 17:10:09,389 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [559904703] [2020-07-21 17:10:09,391 INFO L459 AbstractCegarLoop]: Interpolant automaton has 46 states [2020-07-21 17:10:09,391 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 17:10:09,392 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2020-07-21 17:10:09,392 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=371, Invalid=1699, Unknown=0, NotChecked=0, Total=2070 [2020-07-21 17:10:09,392 INFO L87 Difference]: Start difference. First operand 900 states and 1184 transitions. Second operand 46 states. [2020-07-21 17:10:10,101 WARN L193 SmtUtils]: Spent 114.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 17 [2020-07-21 17:10:10,356 WARN L193 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 18 [2020-07-21 17:10:10,639 WARN L193 SmtUtils]: Spent 121.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 18 [2020-07-21 17:10:10,953 WARN L193 SmtUtils]: Spent 152.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 18 [2020-07-21 17:10:11,343 WARN L193 SmtUtils]: Spent 120.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 16 [2020-07-21 17:10:11,600 WARN L193 SmtUtils]: Spent 123.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 17 [2020-07-21 17:10:11,846 WARN L193 SmtUtils]: Spent 120.00 ms on a formula simplification. DAG size of input: 20 DAG size of output: 16 [2020-07-21 17:10:12,135 WARN L193 SmtUtils]: Spent 126.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 19 [2020-07-21 17:10:12,514 WARN L193 SmtUtils]: Spent 219.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 24 [2020-07-21 17:10:12,931 WARN L193 SmtUtils]: Spent 209.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 24 [2020-07-21 17:10:13,277 WARN L193 SmtUtils]: Spent 211.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 24 [2020-07-21 17:10:13,615 WARN L193 SmtUtils]: Spent 215.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 24 [2020-07-21 17:10:13,891 WARN L193 SmtUtils]: Spent 140.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 20 [2020-07-21 17:10:14,204 WARN L193 SmtUtils]: Spent 136.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 19 [2020-07-21 17:10:14,604 WARN L193 SmtUtils]: Spent 118.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 17 [2020-07-21 17:10:14,893 WARN L193 SmtUtils]: Spent 127.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 17 [2020-07-21 17:10:15,132 WARN L193 SmtUtils]: Spent 124.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 17 [2020-07-21 17:10:15,385 WARN L193 SmtUtils]: Spent 114.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 18 [2020-07-21 17:10:15,687 WARN L193 SmtUtils]: Spent 126.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 19 [2020-07-21 17:10:16,059 WARN L193 SmtUtils]: Spent 202.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 24 [2020-07-21 17:10:16,493 WARN L193 SmtUtils]: Spent 219.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 24 [2020-07-21 17:10:16,874 WARN L193 SmtUtils]: Spent 219.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 24 [2020-07-21 17:10:17,230 WARN L193 SmtUtils]: Spent 228.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 24 [2020-07-21 17:10:17,578 WARN L193 SmtUtils]: Spent 210.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 25 [2020-07-21 17:10:17,859 WARN L193 SmtUtils]: Spent 143.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 20 [2020-07-21 17:10:18,251 WARN L193 SmtUtils]: Spent 226.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 24 [2020-07-21 17:10:18,718 WARN L193 SmtUtils]: Spent 219.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 23 [2020-07-21 17:10:19,138 WARN L193 SmtUtils]: Spent 217.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 23 [2020-07-21 17:10:19,460 WARN L193 SmtUtils]: Spent 163.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 23 [2020-07-21 17:10:19,817 WARN L193 SmtUtils]: Spent 211.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 24 [2020-07-21 17:10:20,220 WARN L193 SmtUtils]: Spent 214.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 24 [2020-07-21 17:10:20,548 WARN L193 SmtUtils]: Spent 123.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 19 [2020-07-21 17:10:20,867 WARN L193 SmtUtils]: Spent 119.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 19 [2020-07-21 17:10:21,286 WARN L193 SmtUtils]: Spent 116.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 16 [2020-07-21 17:10:21,567 WARN L193 SmtUtils]: Spent 112.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 17 [2020-07-21 17:10:21,813 WARN L193 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 16 [2020-07-21 17:10:22,054 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 17 [2020-07-21 17:10:22,321 WARN L193 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 17 [2020-07-21 17:10:22,814 WARN L193 SmtUtils]: Spent 202.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 24 [2020-07-21 17:10:23,225 WARN L193 SmtUtils]: Spent 194.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 24 [2020-07-21 17:10:23,616 WARN L193 SmtUtils]: Spent 208.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 24 [2020-07-21 17:10:23,983 WARN L193 SmtUtils]: Spent 214.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 24 [2020-07-21 17:10:24,348 WARN L193 SmtUtils]: Spent 207.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 25 [2020-07-21 17:10:24,718 WARN L193 SmtUtils]: Spent 217.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 25 [2020-07-21 17:10:25,009 WARN L193 SmtUtils]: Spent 136.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 20 [2020-07-21 17:10:25,419 WARN L193 SmtUtils]: Spent 212.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 24 [2020-07-21 17:10:25,916 WARN L193 SmtUtils]: Spent 213.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 23 [2020-07-21 17:10:26,377 WARN L193 SmtUtils]: Spent 224.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 23 [2020-07-21 17:10:26,790 WARN L193 SmtUtils]: Spent 213.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 23 [2020-07-21 17:10:27,200 WARN L193 SmtUtils]: Spent 210.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 24 [2020-07-21 17:10:27,596 WARN L193 SmtUtils]: Spent 220.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 24 [2020-07-21 17:10:28,034 WARN L193 SmtUtils]: Spent 227.00 ms on a formula simplification. DAG size of input: 30 DAG size of output: 24 [2020-07-21 17:10:28,408 WARN L193 SmtUtils]: Spent 125.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 19 [2020-07-21 17:10:28,901 WARN L193 SmtUtils]: Spent 231.00 ms on a formula simplification. DAG size of input: 30 DAG size of output: 22 [2020-07-21 17:10:29,448 WARN L193 SmtUtils]: Spent 225.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 24 [2020-07-21 17:10:29,949 WARN L193 SmtUtils]: Spent 222.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 23