/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_FUNCTIONS --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/bitvector/soft_float_2a.c.cil.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-21 12:55:52,009 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-21 12:55:52,011 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-21 12:55:52,024 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-21 12:55:52,024 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-21 12:55:52,025 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-21 12:55:52,027 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-21 12:55:52,029 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-21 12:55:52,031 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-21 12:55:52,032 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-21 12:55:52,033 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-21 12:55:52,034 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-21 12:55:52,034 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-21 12:55:52,035 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-21 12:55:52,036 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-21 12:55:52,038 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-21 12:55:52,039 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-21 12:55:52,039 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-21 12:55:52,041 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-21 12:55:52,043 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-21 12:55:52,045 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-21 12:55:52,046 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-21 12:55:52,047 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-21 12:55:52,048 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-21 12:55:52,051 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-21 12:55:52,054 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-07-21 12:55:52,055 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-07-21 12:55:52,055 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-07-21 12:55:52,056 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-07-21 12:55:52,057 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-07-21 12:55:52,057 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-07-21 12:55:52,058 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-07-21 12:55:52,058 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-07-21 12:55:52,059 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-21 12:55:52,059 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-21 12:55:52,060 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-21 12:55:52,061 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 12:55:52,076 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-21 12:55:52,076 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-21 12:55:52,078 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-21 12:55:52,078 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-21 12:55:52,078 INFO L138 SettingsManager]: * Use SBE=true [2020-07-21 12:55:52,078 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-21 12:55:52,079 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-21 12:55:52,079 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-21 12:55:52,079 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-21 12:55:52,079 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-21 12:55:52,079 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-21 12:55:52,080 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-21 12:55:52,080 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-21 12:55:52,080 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-21 12:55:52,080 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-21 12:55:52,080 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-21 12:55:52,081 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-21 12:55:52,081 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-21 12:55:52,081 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-21 12:55:52,081 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-21 12:55:52,081 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-21 12:55:52,082 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 12:55:52,082 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-21 12:55:52,082 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-21 12:55:52,082 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-21 12:55:52,083 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-21 12:55:52,083 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 12:55:52,083 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-21 12:55:52,083 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-21 12:55:52,083 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_FUNCTIONS 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 12:55:52,379 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-21 12:55:52,392 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-21 12:55:52,395 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-21 12:55:52,397 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-21 12:55:52,397 INFO L275 PluginConnector]: CDTParser initialized [2020-07-21 12:55:52,398 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/bitvector/soft_float_2a.c.cil.c [2020-07-21 12:55:52,470 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/70232e672/e805d35ecbd54df0a292e3f9a4792291/FLAG992539d9d [2020-07-21 12:55:52,946 INFO L306 CDTParser]: Found 1 translation units. [2020-07-21 12:55:52,947 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/bitvector/soft_float_2a.c.cil.c [2020-07-21 12:55:52,959 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/70232e672/e805d35ecbd54df0a292e3f9a4792291/FLAG992539d9d [2020-07-21 12:55:53,364 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/70232e672/e805d35ecbd54df0a292e3f9a4792291 [2020-07-21 12:55:53,374 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-21 12:55:53,378 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-21 12:55:53,379 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-21 12:55:53,379 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-21 12:55:53,383 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-21 12:55:53,385 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 12:55:53" (1/1) ... [2020-07-21 12:55:53,388 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@27edf361 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 12:55:53, skipping insertion in model container [2020-07-21 12:55:53,388 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 12:55:53" (1/1) ... [2020-07-21 12:55:53,397 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-21 12:55:53,439 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-21 12:55:53,662 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 12:55:53,668 INFO L203 MainTranslator]: Completed pre-run [2020-07-21 12:55:53,711 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 12:55:53,812 INFO L208 MainTranslator]: Completed translation [2020-07-21 12:55:53,813 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 12:55:53 WrapperNode [2020-07-21 12:55:53,813 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-21 12:55:53,814 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-21 12:55:53,814 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-21 12:55:53,814 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-21 12:55:53,826 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 12:55:53" (1/1) ... [2020-07-21 12:55:53,826 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 12:55:53" (1/1) ... [2020-07-21 12:55:53,833 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 12:55:53" (1/1) ... [2020-07-21 12:55:53,834 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 12:55:53" (1/1) ... [2020-07-21 12:55:53,843 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 12:55:53" (1/1) ... [2020-07-21 12:55:53,851 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 12:55:53" (1/1) ... [2020-07-21 12:55:53,853 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 12:55:53" (1/1) ... [2020-07-21 12:55:53,856 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-21 12:55:53,856 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-21 12:55:53,857 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-21 12:55:53,857 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-21 12:55:53,858 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 12:55:53" (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 12:55:53,925 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-21 12:55:53,925 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-21 12:55:53,925 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-07-21 12:55:53,925 INFO L138 BoogieDeclarations]: Found implementation of procedure base2flt [2020-07-21 12:55:53,925 INFO L138 BoogieDeclarations]: Found implementation of procedure addflt [2020-07-21 12:55:53,926 INFO L138 BoogieDeclarations]: Found implementation of procedure mulflt [2020-07-21 12:55:53,926 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-21 12:55:53,926 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-21 12:55:53,926 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_char [2020-07-21 12:55:53,926 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_uint [2020-07-21 12:55:53,926 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-07-21 12:55:53,926 INFO L130 BoogieDeclarations]: Found specification of procedure base2flt [2020-07-21 12:55:53,927 INFO L130 BoogieDeclarations]: Found specification of procedure addflt [2020-07-21 12:55:53,927 INFO L130 BoogieDeclarations]: Found specification of procedure mulflt [2020-07-21 12:55:53,927 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-21 12:55:53,927 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-21 12:55:53,927 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-21 12:55:54,432 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-21 12:55:54,432 INFO L295 CfgBuilder]: Removed 2 assume(true) statements. [2020-07-21 12:55:54,437 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 12:55:54 BoogieIcfgContainer [2020-07-21 12:55:54,437 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-21 12:55:54,439 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-21 12:55:54,439 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-21 12:55:54,442 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-21 12:55:54,442 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.07 12:55:53" (1/3) ... [2020-07-21 12:55:54,443 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5237cc32 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 12:55:54, skipping insertion in model container [2020-07-21 12:55:54,443 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 12:55:53" (2/3) ... [2020-07-21 12:55:54,444 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5237cc32 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 12:55:54, skipping insertion in model container [2020-07-21 12:55:54,444 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 12:55:54" (3/3) ... [2020-07-21 12:55:54,446 INFO L109 eAbstractionObserver]: Analyzing ICFG soft_float_2a.c.cil.c [2020-07-21 12:55:54,456 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-21 12:55:54,464 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-21 12:55:54,478 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-21 12:55:54,504 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-21 12:55:54,505 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-21 12:55:54,505 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-21 12:55:54,505 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-21 12:55:54,505 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-21 12:55:54,506 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-21 12:55:54,506 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-21 12:55:54,506 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-21 12:55:54,525 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states. [2020-07-21 12:55:54,535 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2020-07-21 12:55:54,535 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 12:55:54,536 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 12:55:54,537 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 12:55:54,542 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 12:55:54,543 INFO L82 PathProgramCache]: Analyzing trace with hash -1570912407, now seen corresponding path program 1 times [2020-07-21 12:55:54,550 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 12:55:54,551 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1002110527] [2020-07-21 12:55:54,551 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 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 12:55:54,648 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 12:55:54,649 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 12:55:54,652 INFO L263 TraceCheckSpWp]: Trace formula consists of 109 conjuncts, 5 conjunts are in the unsatisfiable core [2020-07-21 12:55:54,660 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 12:55:54,722 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 24 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2020-07-21 12:55:54,723 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 12:55:54,724 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1002110527] [2020-07-21 12:55:54,725 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 12:55:54,725 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-07-21 12:55:54,726 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [734303678] [2020-07-21 12:55:54,731 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-07-21 12:55:54,732 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 12:55:54,743 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-07-21 12:55:54,744 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-07-21 12:55:54,746 INFO L87 Difference]: Start difference. First operand 68 states. Second operand 4 states. [2020-07-21 12:55:54,911 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 12:55:54,912 INFO L93 Difference]: Finished difference Result 126 states and 192 transitions. [2020-07-21 12:55:54,913 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-21 12:55:54,914 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 48 [2020-07-21 12:55:54,915 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 12:55:54,926 INFO L225 Difference]: With dead ends: 126 [2020-07-21 12:55:54,927 INFO L226 Difference]: Without dead ends: 66 [2020-07-21 12:55:54,931 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 45 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-07-21 12:55:54,950 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2020-07-21 12:55:54,982 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 57. [2020-07-21 12:55:54,983 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2020-07-21 12:55:54,985 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 77 transitions. [2020-07-21 12:55:54,987 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 77 transitions. Word has length 48 [2020-07-21 12:55:54,988 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 12:55:54,988 INFO L479 AbstractCegarLoop]: Abstraction has 57 states and 77 transitions. [2020-07-21 12:55:54,988 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-07-21 12:55:54,988 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 77 transitions. [2020-07-21 12:55:54,991 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2020-07-21 12:55:54,992 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 12:55:54,992 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 12:55:55,208 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 12:55:55,208 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 12:55:55,209 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 12:55:55,209 INFO L82 PathProgramCache]: Analyzing trace with hash -771486554, now seen corresponding path program 1 times [2020-07-21 12:55:55,210 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 12:55:55,210 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1289028456] [2020-07-21 12:55:55,211 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 12:55:55,271 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 12:55:55,271 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 12:55:55,273 INFO L263 TraceCheckSpWp]: Trace formula consists of 110 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 12:55:55,277 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 12:55:55,311 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 24 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2020-07-21 12:55:55,311 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 12:55:55,312 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1289028456] [2020-07-21 12:55:55,312 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 12:55:55,312 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-07-21 12:55:55,313 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2014479719] [2020-07-21 12:55:55,314 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-07-21 12:55:55,315 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 12:55:55,315 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-07-21 12:55:55,315 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-07-21 12:55:55,316 INFO L87 Difference]: Start difference. First operand 57 states and 77 transitions. Second operand 4 states. [2020-07-21 12:55:55,418 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 12:55:55,418 INFO L93 Difference]: Finished difference Result 113 states and 156 transitions. [2020-07-21 12:55:55,419 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-07-21 12:55:55,419 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 51 [2020-07-21 12:55:55,420 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 12:55:55,422 INFO L225 Difference]: With dead ends: 113 [2020-07-21 12:55:55,422 INFO L226 Difference]: Without dead ends: 66 [2020-07-21 12:55:55,424 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 49 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-07-21 12:55:55,424 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2020-07-21 12:55:55,434 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 62. [2020-07-21 12:55:55,435 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 62 states. [2020-07-21 12:55:55,436 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 84 transitions. [2020-07-21 12:55:55,437 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 84 transitions. Word has length 51 [2020-07-21 12:55:55,437 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 12:55:55,437 INFO L479 AbstractCegarLoop]: Abstraction has 62 states and 84 transitions. [2020-07-21 12:55:55,437 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-07-21 12:55:55,438 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 84 transitions. [2020-07-21 12:55:55,440 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2020-07-21 12:55:55,440 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 12:55:55,440 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 12:55:55,654 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 12:55:55,655 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 12:55:55,656 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 12:55:55,656 INFO L82 PathProgramCache]: Analyzing trace with hash 1437145176, now seen corresponding path program 1 times [2020-07-21 12:55:55,657 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 12:55:55,657 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [739829003] [2020-07-21 12:55:55,658 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 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 12:55:55,716 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 12:55:55,716 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 12:55:55,717 INFO L263 TraceCheckSpWp]: Trace formula consists of 108 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 12:55:55,724 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 12:55:55,750 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 24 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2020-07-21 12:55:55,751 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 12:55:55,751 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [739829003] [2020-07-21 12:55:55,751 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 12:55:55,758 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-07-21 12:55:55,758 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1807005750] [2020-07-21 12:55:55,758 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-07-21 12:55:55,759 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 12:55:55,759 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-07-21 12:55:55,761 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-07-21 12:55:55,762 INFO L87 Difference]: Start difference. First operand 62 states and 84 transitions. Second operand 4 states. [2020-07-21 12:55:55,851 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 12:55:55,851 INFO L93 Difference]: Finished difference Result 124 states and 172 transitions. [2020-07-21 12:55:55,853 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-07-21 12:55:55,854 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 52 [2020-07-21 12:55:55,854 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 12:55:55,856 INFO L225 Difference]: With dead ends: 124 [2020-07-21 12:55:55,856 INFO L226 Difference]: Without dead ends: 72 [2020-07-21 12:55:55,857 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 50 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-07-21 12:55:55,857 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2020-07-21 12:55:55,867 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 65. [2020-07-21 12:55:55,867 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 65 states. [2020-07-21 12:55:55,869 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 89 transitions. [2020-07-21 12:55:55,869 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 89 transitions. Word has length 52 [2020-07-21 12:55:55,869 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 12:55:55,870 INFO L479 AbstractCegarLoop]: Abstraction has 65 states and 89 transitions. [2020-07-21 12:55:55,870 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-07-21 12:55:55,870 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 89 transitions. [2020-07-21 12:55:55,872 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2020-07-21 12:55:55,872 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 12:55:55,872 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 12:55:56,087 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 12:55:56,089 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 12:55:56,089 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 12:55:56,090 INFO L82 PathProgramCache]: Analyzing trace with hash -1843842924, now seen corresponding path program 1 times [2020-07-21 12:55:56,090 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 12:55:56,091 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1306516288] [2020-07-21 12:55:56,091 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 12:55:56,142 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 12:55:56,142 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 12:55:56,143 INFO L263 TraceCheckSpWp]: Trace formula consists of 108 conjuncts, 5 conjunts are in the unsatisfiable core [2020-07-21 12:55:56,146 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 12:55:56,170 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 24 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2020-07-21 12:55:56,170 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 12:55:56,171 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1306516288] [2020-07-21 12:55:56,171 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 12:55:56,171 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-07-21 12:55:56,172 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [435524031] [2020-07-21 12:55:56,172 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-07-21 12:55:56,172 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 12:55:56,173 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-07-21 12:55:56,173 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-07-21 12:55:56,173 INFO L87 Difference]: Start difference. First operand 65 states and 89 transitions. Second operand 4 states. [2020-07-21 12:55:56,256 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 12:55:56,256 INFO L93 Difference]: Finished difference Result 128 states and 177 transitions. [2020-07-21 12:55:56,257 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-21 12:55:56,257 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 52 [2020-07-21 12:55:56,257 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 12:55:56,259 INFO L225 Difference]: With dead ends: 128 [2020-07-21 12:55:56,259 INFO L226 Difference]: Without dead ends: 73 [2020-07-21 12:55:56,260 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 50 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-07-21 12:55:56,261 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73 states. [2020-07-21 12:55:56,269 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73 to 63. [2020-07-21 12:55:56,269 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 63 states. [2020-07-21 12:55:56,270 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 85 transitions. [2020-07-21 12:55:56,271 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 85 transitions. Word has length 52 [2020-07-21 12:55:56,271 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 12:55:56,271 INFO L479 AbstractCegarLoop]: Abstraction has 63 states and 85 transitions. [2020-07-21 12:55:56,271 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-07-21 12:55:56,272 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 85 transitions. [2020-07-21 12:55:56,274 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2020-07-21 12:55:56,274 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 12:55:56,274 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 12:55:56,488 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 12:55:56,489 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 12:55:56,489 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 12:55:56,489 INFO L82 PathProgramCache]: Analyzing trace with hash -1553856699, now seen corresponding path program 1 times [2020-07-21 12:55:56,490 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 12:55:56,490 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1445053476] [2020-07-21 12:55:56,491 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 12:55:56,545 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 12:55:56,545 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 12:55:56,546 INFO L263 TraceCheckSpWp]: Trace formula consists of 113 conjuncts, 7 conjunts are in the unsatisfiable core [2020-07-21 12:55:56,555 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 12:55:56,594 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 24 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2020-07-21 12:55:56,595 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 12:55:56,595 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1445053476] [2020-07-21 12:55:56,595 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 12:55:56,595 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-21 12:55:56,596 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [542917265] [2020-07-21 12:55:56,599 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-21 12:55:56,599 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 12:55:56,600 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-21 12:55:56,600 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-21 12:55:56,600 INFO L87 Difference]: Start difference. First operand 63 states and 85 transitions. Second operand 5 states. [2020-07-21 12:55:56,734 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 12:55:56,734 INFO L93 Difference]: Finished difference Result 133 states and 184 transitions. [2020-07-21 12:55:56,735 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-21 12:55:56,735 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 53 [2020-07-21 12:55:56,736 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 12:55:56,737 INFO L225 Difference]: With dead ends: 133 [2020-07-21 12:55:56,737 INFO L226 Difference]: Without dead ends: 80 [2020-07-21 12:55:56,738 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 49 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-07-21 12:55:56,739 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 80 states. [2020-07-21 12:55:56,747 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 80 to 64. [2020-07-21 12:55:56,748 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 64 states. [2020-07-21 12:55:56,748 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 87 transitions. [2020-07-21 12:55:56,749 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 87 transitions. Word has length 53 [2020-07-21 12:55:56,749 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 12:55:56,749 INFO L479 AbstractCegarLoop]: Abstraction has 64 states and 87 transitions. [2020-07-21 12:55:56,749 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-21 12:55:56,750 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 87 transitions. [2020-07-21 12:55:56,751 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2020-07-21 12:55:56,751 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 12:55:56,751 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 4, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 12:55:56,965 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 12:55:56,966 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 12:55:56,967 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 12:55:56,967 INFO L82 PathProgramCache]: Analyzing trace with hash 76110071, now seen corresponding path program 1 times [2020-07-21 12:55:56,967 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 12:55:56,967 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [520127961] [2020-07-21 12:55:56,968 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 12:55:57,028 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 12:55:57,029 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 12:55:57,030 INFO L263 TraceCheckSpWp]: Trace formula consists of 113 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-21 12:55:57,033 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 12:55:57,059 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 24 proven. 2 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2020-07-21 12:55:57,059 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 12:55:57,173 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 4 proven. 10 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2020-07-21 12:55:57,173 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [520127961] [2020-07-21 12:55:57,174 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 12:55:57,174 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 8 [2020-07-21 12:55:57,177 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1107379395] [2020-07-21 12:55:57,179 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-07-21 12:55:57,179 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 12:55:57,180 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-07-21 12:55:57,181 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=32, Unknown=0, NotChecked=0, Total=56 [2020-07-21 12:55:57,181 INFO L87 Difference]: Start difference. First operand 64 states and 87 transitions. Second operand 8 states. [2020-07-21 12:55:57,313 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 12:55:57,313 INFO L93 Difference]: Finished difference Result 147 states and 206 transitions. [2020-07-21 12:55:57,313 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-21 12:55:57,314 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 54 [2020-07-21 12:55:57,314 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 12:55:57,315 INFO L225 Difference]: With dead ends: 147 [2020-07-21 12:55:57,315 INFO L226 Difference]: Without dead ends: 93 [2020-07-21 12:55:57,316 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 111 GetRequests, 102 SyntacticMatches, 1 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=40, Invalid=50, Unknown=0, NotChecked=0, Total=90 [2020-07-21 12:55:57,321 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 93 states. [2020-07-21 12:55:57,337 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 93 to 72. [2020-07-21 12:55:57,338 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 72 states. [2020-07-21 12:55:57,343 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 100 transitions. [2020-07-21 12:55:57,343 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 100 transitions. Word has length 54 [2020-07-21 12:55:57,344 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 12:55:57,344 INFO L479 AbstractCegarLoop]: Abstraction has 72 states and 100 transitions. [2020-07-21 12:55:57,344 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-07-21 12:55:57,344 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 100 transitions. [2020-07-21 12:55:57,346 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2020-07-21 12:55:57,346 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 12:55:57,346 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 4, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 12:55:57,551 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 12:55:57,551 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 12:55:57,552 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 12:55:57,552 INFO L82 PathProgramCache]: Analyzing trace with hash 1237680982, now seen corresponding path program 1 times [2020-07-21 12:55:57,552 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 12:55:57,553 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [421462479] [2020-07-21 12:55:57,553 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 12:55:57,600 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 12:55:57,600 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 12:55:57,601 INFO L263 TraceCheckSpWp]: Trace formula consists of 116 conjuncts, 9 conjunts are in the unsatisfiable core [2020-07-21 12:55:57,603 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 12:55:57,658 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 24 proven. 3 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2020-07-21 12:55:57,658 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 12:55:57,780 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 4 proven. 11 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2020-07-21 12:55:57,781 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [421462479] [2020-07-21 12:55:57,781 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 12:55:57,781 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 10 [2020-07-21 12:55:57,781 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1924575155] [2020-07-21 12:55:57,782 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-07-21 12:55:57,782 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 12:55:57,783 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-07-21 12:55:57,783 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=57, Unknown=0, NotChecked=0, Total=90 [2020-07-21 12:55:57,783 INFO L87 Difference]: Start difference. First operand 72 states and 100 transitions. Second operand 10 states. [2020-07-21 12:56:04,164 WARN L193 SmtUtils]: Spent 6.23 s on a formula simplification that was a NOOP. DAG size: 23 [2020-07-21 12:56:08,510 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 12:56:08,511 INFO L93 Difference]: Finished difference Result 172 states and 244 transitions. [2020-07-21 12:56:08,511 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-21 12:56:08,512 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 56 [2020-07-21 12:56:08,512 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 12:56:08,514 INFO L225 Difference]: With dead ends: 172 [2020-07-21 12:56:08,514 INFO L226 Difference]: Without dead ends: 110 [2020-07-21 12:56:08,515 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 119 GetRequests, 105 SyntacticMatches, 1 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 8.4s TimeCoverageRelationStatistics Valid=81, Invalid=128, Unknown=1, NotChecked=0, Total=210 [2020-07-21 12:56:08,516 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 110 states. [2020-07-21 12:56:08,542 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 110 to 76. [2020-07-21 12:56:08,543 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 76 states. [2020-07-21 12:56:08,544 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 107 transitions. [2020-07-21 12:56:08,545 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 107 transitions. Word has length 56 [2020-07-21 12:56:08,545 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 12:56:08,545 INFO L479 AbstractCegarLoop]: Abstraction has 76 states and 107 transitions. [2020-07-21 12:56:08,545 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-07-21 12:56:08,545 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 107 transitions. [2020-07-21 12:56:08,546 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2020-07-21 12:56:08,546 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 12:56:08,546 INFO L422 BasicCegarLoop]: trace histogram [5, 4, 4, 4, 4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 12:56:08,749 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 12:56:08,750 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 12:56:08,751 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 12:56:08,751 INFO L82 PathProgramCache]: Analyzing trace with hash -1481152154, now seen corresponding path program 2 times [2020-07-21 12:56:08,751 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 12:56:08,752 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1472630433] [2020-07-21 12:56:08,752 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 12:56:08,796 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 12:56:08,797 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 12:56:08,798 INFO L263 TraceCheckSpWp]: Trace formula consists of 130 conjuncts, 7 conjunts are in the unsatisfiable core [2020-07-21 12:56:08,800 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 12:56:08,878 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 24 proven. 26 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2020-07-21 12:56:08,878 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 12:56:09,067 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 4 proven. 34 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2020-07-21 12:56:09,068 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1472630433] [2020-07-21 12:56:09,068 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 12:56:09,068 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 14 [2020-07-21 12:56:09,069 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [61057176] [2020-07-21 12:56:09,069 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-07-21 12:56:09,069 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 12:56:09,070 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-07-21 12:56:09,070 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=81, Invalid=101, Unknown=0, NotChecked=0, Total=182 [2020-07-21 12:56:09,070 INFO L87 Difference]: Start difference. First operand 76 states and 107 transitions. Second operand 14 states. [2020-07-21 12:56:09,266 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 12:56:09,266 INFO L93 Difference]: Finished difference Result 210 states and 300 transitions. [2020-07-21 12:56:09,267 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-07-21 12:56:09,267 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 63 [2020-07-21 12:56:09,267 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 12:56:09,269 INFO L225 Difference]: With dead ends: 210 [2020-07-21 12:56:09,269 INFO L226 Difference]: Without dead ends: 144 [2020-07-21 12:56:09,270 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 135 GetRequests, 117 SyntacticMatches, 1 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=151, Invalid=191, Unknown=0, NotChecked=0, Total=342 [2020-07-21 12:56:09,271 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 144 states. [2020-07-21 12:56:09,297 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 144 to 90. [2020-07-21 12:56:09,298 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 90 states. [2020-07-21 12:56:09,299 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 90 states to 90 states and 130 transitions. [2020-07-21 12:56:09,299 INFO L78 Accepts]: Start accepts. Automaton has 90 states and 130 transitions. Word has length 63 [2020-07-21 12:56:09,301 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 12:56:09,301 INFO L479 AbstractCegarLoop]: Abstraction has 90 states and 130 transitions. [2020-07-21 12:56:09,302 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-07-21 12:56:09,302 INFO L276 IsEmpty]: Start isEmpty. Operand 90 states and 130 transitions. [2020-07-21 12:56:09,304 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2020-07-21 12:56:09,304 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 12:56:09,305 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 5, 4, 4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 12:56:09,519 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 12:56:09,520 INFO L427 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 12:56:09,520 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 12:56:09,520 INFO L82 PathProgramCache]: Analyzing trace with hash 1366171286, now seen corresponding path program 2 times [2020-07-21 12:56:09,520 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 12:56:09,521 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [570843124] [2020-07-21 12:56:09,521 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 12:56:09,562 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 12:56:09,562 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 12:56:09,563 INFO L263 TraceCheckSpWp]: Trace formula consists of 138 conjuncts, 17 conjunts are in the unsatisfiable core [2020-07-21 12:56:09,566 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 12:56:09,658 INFO L134 CoverageAnalysis]: Checked inductivity of 75 backedges. 24 proven. 45 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2020-07-21 12:56:09,659 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 12:56:09,987 INFO L134 CoverageAnalysis]: Checked inductivity of 75 backedges. 4 proven. 53 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2020-07-21 12:56:09,988 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [570843124] [2020-07-21 12:56:09,988 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 12:56:09,988 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10] total 18 [2020-07-21 12:56:09,989 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1289125802] [2020-07-21 12:56:09,989 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-07-21 12:56:09,990 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 12:56:09,990 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-07-21 12:56:09,990 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=97, Invalid=209, Unknown=0, NotChecked=0, Total=306 [2020-07-21 12:56:09,990 INFO L87 Difference]: Start difference. First operand 90 states and 130 transitions. Second operand 18 states. [2020-07-21 12:56:43,581 WARN L193 SmtUtils]: Spent 33.09 s on a formula simplification. DAG size of input: 47 DAG size of output: 29 [2020-07-21 12:56:53,857 WARN L193 SmtUtils]: Spent 4.75 s on a formula simplification. DAG size of input: 41 DAG size of output: 17 [2020-07-21 12:57:08,052 WARN L193 SmtUtils]: Spent 11.97 s on a formula simplification. DAG size of input: 35 DAG size of output: 17 [2020-07-21 12:57:28,856 WARN L193 SmtUtils]: Spent 16.56 s on a formula simplification. DAG size of input: 29 DAG size of output: 23 [2020-07-21 12:57:44,047 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 12:57:44,047 INFO L93 Difference]: Finished difference Result 242 states and 352 transitions. [2020-07-21 12:57:44,048 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2020-07-21 12:57:44,048 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 68 [2020-07-21 12:57:44,049 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 12:57:44,050 INFO L225 Difference]: With dead ends: 242 [2020-07-21 12:57:44,052 INFO L226 Difference]: Without dead ends: 162 [2020-07-21 12:57:44,054 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 155 GetRequests, 125 SyntacticMatches, 1 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 122 ImplicationChecksByTransitivity, 87.5s TimeCoverageRelationStatistics Valid=319, Invalid=604, Unknown=7, NotChecked=0, Total=930 [2020-07-21 12:57:44,054 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 162 states. [2020-07-21 12:57:44,080 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 162 to 100. [2020-07-21 12:57:44,080 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 100 states. [2020-07-21 12:57:44,083 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 100 states to 100 states and 147 transitions. [2020-07-21 12:57:44,083 INFO L78 Accepts]: Start accepts. Automaton has 100 states and 147 transitions. Word has length 68 [2020-07-21 12:57:44,083 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 12:57:44,084 INFO L479 AbstractCegarLoop]: Abstraction has 100 states and 147 transitions. [2020-07-21 12:57:44,084 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-07-21 12:57:44,084 INFO L276 IsEmpty]: Start isEmpty. Operand 100 states and 147 transitions. [2020-07-21 12:57:44,090 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2020-07-21 12:57:44,090 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 12:57:44,091 INFO L422 BasicCegarLoop]: trace histogram [11, 10, 10, 4, 4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 12:57:44,305 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 12:57:44,305 INFO L427 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 12:57:44,306 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 12:57:44,306 INFO L82 PathProgramCache]: Analyzing trace with hash -2116167546, now seen corresponding path program 3 times [2020-07-21 12:57:44,306 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 12:57:44,307 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1211675125] [2020-07-21 12:57:44,307 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 12:57:44,365 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 12:57:44,365 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 12:57:44,366 INFO L263 TraceCheckSpWp]: Trace formula consists of 161 conjuncts, 13 conjunts are in the unsatisfiable core [2020-07-21 12:57:44,370 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 12:57:44,535 INFO L134 CoverageAnalysis]: Checked inductivity of 185 backedges. 24 proven. 155 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2020-07-21 12:57:44,536 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 12:57:45,028 INFO L134 CoverageAnalysis]: Checked inductivity of 185 backedges. 4 proven. 163 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2020-07-21 12:57:45,029 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1211675125] [2020-07-21 12:57:45,029 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 12:57:45,029 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14] total 26 [2020-07-21 12:57:45,030 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [364303333] [2020-07-21 12:57:45,030 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2020-07-21 12:57:45,030 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 12:57:45,031 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2020-07-21 12:57:45,031 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=303, Invalid=347, Unknown=0, NotChecked=0, Total=650 [2020-07-21 12:57:45,032 INFO L87 Difference]: Start difference. First operand 100 states and 147 transitions. Second operand 26 states. [2020-07-21 12:57:45,458 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 12:57:45,458 INFO L93 Difference]: Finished difference Result 336 states and 488 transitions. [2020-07-21 12:57:45,459 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2020-07-21 12:57:45,459 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 81 [2020-07-21 12:57:45,459 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 12:57:45,461 INFO L225 Difference]: With dead ends: 336 [2020-07-21 12:57:45,462 INFO L226 Difference]: Without dead ends: 246 [2020-07-21 12:57:45,463 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 183 GetRequests, 147 SyntacticMatches, 1 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 75 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=589, Invalid=743, Unknown=0, NotChecked=0, Total=1332 [2020-07-21 12:57:45,464 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 246 states. [2020-07-21 12:57:45,480 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 246 to 126. [2020-07-21 12:57:45,481 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 126 states. [2020-07-21 12:57:45,482 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 126 states to 126 states and 190 transitions. [2020-07-21 12:57:45,482 INFO L78 Accepts]: Start accepts. Automaton has 126 states and 190 transitions. Word has length 81 [2020-07-21 12:57:45,482 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 12:57:45,483 INFO L479 AbstractCegarLoop]: Abstraction has 126 states and 190 transitions. [2020-07-21 12:57:45,483 INFO L480 AbstractCegarLoop]: Interpolant automaton has 26 states. [2020-07-21 12:57:45,483 INFO L276 IsEmpty]: Start isEmpty. Operand 126 states and 190 transitions. [2020-07-21 12:57:45,484 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 93 [2020-07-21 12:57:45,484 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 12:57:45,484 INFO L422 BasicCegarLoop]: trace histogram [14, 14, 13, 4, 4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 12:57:45,685 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 12:57:45,685 INFO L427 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 12:57:45,685 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 12:57:45,685 INFO L82 PathProgramCache]: Analyzing trace with hash -316492522, now seen corresponding path program 3 times [2020-07-21 12:57:45,686 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 12:57:45,686 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1404919951] [2020-07-21 12:57:45,686 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 12:57:45,732 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 12:57:45,732 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 12:57:45,733 INFO L263 TraceCheckSpWp]: Trace formula consists of 180 conjuncts, 33 conjunts are in the unsatisfiable core [2020-07-21 12:57:45,736 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 12:57:46,023 INFO L134 CoverageAnalysis]: Checked inductivity of 303 backedges. 24 proven. 273 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2020-07-21 12:57:46,024 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 12:57:46,989 INFO L134 CoverageAnalysis]: Checked inductivity of 303 backedges. 4 proven. 281 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2020-07-21 12:57:46,989 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1404919951] [2020-07-21 12:57:46,989 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 12:57:46,990 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18] total 34 [2020-07-21 12:57:46,990 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [191709658] [2020-07-21 12:57:46,990 INFO L459 AbstractCegarLoop]: Interpolant automaton has 34 states [2020-07-21 12:57:46,991 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 12:57:46,991 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2020-07-21 12:57:46,991 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=306, Invalid=816, Unknown=0, NotChecked=0, Total=1122 [2020-07-21 12:57:46,992 INFO L87 Difference]: Start difference. First operand 126 states and 190 transitions. Second operand 34 states. [2020-07-21 12:58:11,774 WARN L193 SmtUtils]: Spent 12.74 s on a formula simplification. DAG size of input: 59 DAG size of output: 17 [2020-07-21 12:58:36,888 WARN L193 SmtUtils]: Spent 10.48 s on a formula simplification. DAG size of input: 53 DAG size of output: 17 [2020-07-21 12:59:04,407 WARN L193 SmtUtils]: Spent 10.38 s on a formula simplification. DAG size of input: 47 DAG size of output: 17 [2020-07-21 12:59:20,448 WARN L193 SmtUtils]: Spent 6.31 s on a formula simplification. DAG size of input: 41 DAG size of output: 17 [2020-07-21 12:59:37,788 WARN L193 SmtUtils]: Spent 6.48 s on a formula simplification. DAG size of input: 35 DAG size of output: 17 [2020-07-21 12:59:55,878 WARN L193 SmtUtils]: Spent 2.13 s on a formula simplification. DAG size of input: 29 DAG size of output: 17 [2020-07-21 13:00:15,445 WARN L193 SmtUtils]: Spent 6.25 s on a formula simplification that was a NOOP. DAG size: 23 [2020-07-21 13:00:31,099 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:00:31,101 INFO L93 Difference]: Finished difference Result 346 states and 508 transitions. [2020-07-21 13:00:31,105 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2020-07-21 13:00:31,106 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 92 [2020-07-21 13:00:31,106 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:00:31,108 INFO L225 Difference]: With dead ends: 346 [2020-07-21 13:00:31,109 INFO L226 Difference]: Without dead ends: 230 [2020-07-21 13:00:31,111 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 215 GetRequests, 159 SyntacticMatches, 1 SemanticMatches, 55 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 436 ImplicationChecksByTransitivity, 150.6s TimeCoverageRelationStatistics Valid=921, Invalid=2232, Unknown=39, NotChecked=0, Total=3192 [2020-07-21 13:00:31,112 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 230 states. [2020-07-21 13:00:31,125 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 230 to 130. [2020-07-21 13:00:31,125 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 130 states. [2020-07-21 13:00:31,127 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 130 states to 130 states and 197 transitions. [2020-07-21 13:00:31,127 INFO L78 Accepts]: Start accepts. Automaton has 130 states and 197 transitions. Word has length 92 [2020-07-21 13:00:31,127 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:00:31,127 INFO L479 AbstractCegarLoop]: Abstraction has 130 states and 197 transitions. [2020-07-21 13:00:31,127 INFO L480 AbstractCegarLoop]: Interpolant automaton has 34 states. [2020-07-21 13:00:31,128 INFO L276 IsEmpty]: Start isEmpty. Operand 130 states and 197 transitions. [2020-07-21 13:00:31,129 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 118 [2020-07-21 13:00:31,129 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:00:31,129 INFO L422 BasicCegarLoop]: trace histogram [23, 22, 22, 4, 4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:00:31,340 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:00:31,342 INFO L427 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:00:31,342 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:00:31,342 INFO L82 PathProgramCache]: Analyzing trace with hash 1829248710, now seen corresponding path program 4 times [2020-07-21 13:00:31,343 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:00:31,343 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [735079365] [2020-07-21 13:00:31,344 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 13:00:31,399 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 13:00:31,399 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:00:31,401 INFO L263 TraceCheckSpWp]: Trace formula consists of 227 conjuncts, 25 conjunts are in the unsatisfiable core [2020-07-21 13:00:31,403 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:00:31,979 INFO L134 CoverageAnalysis]: Checked inductivity of 767 backedges. 24 proven. 737 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2020-07-21 13:00:31,980 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:00:33,869 INFO L134 CoverageAnalysis]: Checked inductivity of 767 backedges. 4 proven. 745 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2020-07-21 13:00:33,870 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [735079365] [2020-07-21 13:00:33,871 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:00:33,871 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26] total 50 [2020-07-21 13:00:33,871 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1636472145] [2020-07-21 13:00:33,873 INFO L459 AbstractCegarLoop]: Interpolant automaton has 50 states [2020-07-21 13:00:33,873 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:00:33,874 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2020-07-21 13:00:33,878 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1179, Invalid=1271, Unknown=0, NotChecked=0, Total=2450 [2020-07-21 13:00:33,879 INFO L87 Difference]: Start difference. First operand 130 states and 197 transitions. Second operand 50 states. [2020-07-21 13:00:35,244 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:00:35,244 INFO L93 Difference]: Finished difference Result 570 states and 840 transitions. [2020-07-21 13:00:35,245 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 72 states. [2020-07-21 13:00:35,245 INFO L78 Accepts]: Start accepts. Automaton has 50 states. Word has length 117 [2020-07-21 13:00:35,246 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:00:35,249 INFO L225 Difference]: With dead ends: 570 [2020-07-21 13:00:35,250 INFO L226 Difference]: Without dead ends: 450 [2020-07-21 13:00:35,253 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 279 GetRequests, 207 SyntacticMatches, 1 SemanticMatches, 71 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 297 ImplicationChecksByTransitivity, 2.8s TimeCoverageRelationStatistics Valid=2329, Invalid=2927, Unknown=0, NotChecked=0, Total=5256 [2020-07-21 13:00:35,254 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 450 states. [2020-07-21 13:00:35,282 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 450 to 198. [2020-07-21 13:00:35,283 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 198 states. [2020-07-21 13:00:35,285 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 198 states to 198 states and 310 transitions. [2020-07-21 13:00:35,285 INFO L78 Accepts]: Start accepts. Automaton has 198 states and 310 transitions. Word has length 117 [2020-07-21 13:00:35,285 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:00:35,285 INFO L479 AbstractCegarLoop]: Abstraction has 198 states and 310 transitions. [2020-07-21 13:00:35,285 INFO L480 AbstractCegarLoop]: Interpolant automaton has 50 states. [2020-07-21 13:00:35,286 INFO L276 IsEmpty]: Start isEmpty. Operand 198 states and 310 transitions. [2020-07-21 13:00:35,287 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 123 [2020-07-21 13:00:35,287 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:00:35,288 INFO L422 BasicCegarLoop]: trace histogram [24, 24, 23, 4, 4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:00:35,501 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:00:35,502 INFO L427 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:00:35,503 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:00:35,503 INFO L82 PathProgramCache]: Analyzing trace with hash -552090314, now seen corresponding path program 4 times [2020-07-21 13:00:35,504 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:00:35,504 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1770631836] [2020-07-21 13:00:35,504 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 13:00:35,613 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:00:35,613 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:00:35,615 INFO L263 TraceCheckSpWp]: Trace formula consists of 319 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-21 13:00:35,619 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:00:35,634 INFO L134 CoverageAnalysis]: Checked inductivity of 858 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 858 trivial. 0 not checked. [2020-07-21 13:00:35,635 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 13:00:35,635 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1770631836] [2020-07-21 13:00:35,635 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 13:00:35,635 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 13:00:35,636 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [354842006] [2020-07-21 13:00:35,636 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 13:00:35,636 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:00:35,637 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 13:00:35,637 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 13:00:35,638 INFO L87 Difference]: Start difference. First operand 198 states and 310 transitions. Second operand 3 states. [2020-07-21 13:00:35,653 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:00:35,653 INFO L93 Difference]: Finished difference Result 209 states and 323 transitions. [2020-07-21 13:00:35,654 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 13:00:35,654 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 122 [2020-07-21 13:00:35,655 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:00:35,656 INFO L225 Difference]: With dead ends: 209 [2020-07-21 13:00:35,656 INFO L226 Difference]: Without dead ends: 198 [2020-07-21 13:00:35,657 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 121 GetRequests, 120 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 13:00:35,658 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 198 states. [2020-07-21 13:00:35,668 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 198 to 198. [2020-07-21 13:00:35,668 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 198 states. [2020-07-21 13:00:35,670 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 198 states to 198 states and 309 transitions. [2020-07-21 13:00:35,670 INFO L78 Accepts]: Start accepts. Automaton has 198 states and 309 transitions. Word has length 122 [2020-07-21 13:00:35,670 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:00:35,671 INFO L479 AbstractCegarLoop]: Abstraction has 198 states and 309 transitions. [2020-07-21 13:00:35,671 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 13:00:35,671 INFO L276 IsEmpty]: Start isEmpty. Operand 198 states and 309 transitions. [2020-07-21 13:00:35,672 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 125 [2020-07-21 13:00:35,672 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:00:35,673 INFO L422 BasicCegarLoop]: trace histogram [24, 24, 23, 4, 4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:00:35,886 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:00:35,887 INFO L427 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:00:35,887 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:00:35,887 INFO L82 PathProgramCache]: Analyzing trace with hash -1044966756, now seen corresponding path program 1 times [2020-07-21 13:00:35,887 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:00:35,888 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1089713905] [2020-07-21 13:00:35,888 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 13:00:35,979 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 13:00:35,979 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:00:35,981 INFO L263 TraceCheckSpWp]: Trace formula consists of 236 conjuncts, 11 conjunts are in the unsatisfiable core [2020-07-21 13:00:35,983 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:00:36,067 INFO L134 CoverageAnalysis]: Checked inductivity of 858 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 858 trivial. 0 not checked. [2020-07-21 13:00:36,067 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 13:00:36,067 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1089713905] [2020-07-21 13:00:36,068 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 13:00:36,068 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2020-07-21 13:00:36,068 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [908939395] [2020-07-21 13:00:36,069 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-07-21 13:00:36,069 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:00:36,069 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-07-21 13:00:36,069 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2020-07-21 13:00:36,069 INFO L87 Difference]: Start difference. First operand 198 states and 309 transitions. Second operand 6 states. [2020-07-21 13:00:36,211 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:00:36,211 INFO L93 Difference]: Finished difference Result 229 states and 352 transitions. [2020-07-21 13:00:36,212 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-21 13:00:36,212 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 124 [2020-07-21 13:00:36,213 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:00:36,215 INFO L225 Difference]: With dead ends: 229 [2020-07-21 13:00:36,216 INFO L226 Difference]: Without dead ends: 219 [2020-07-21 13:00:36,217 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 124 GetRequests, 118 SyntacticMatches, 1 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2020-07-21 13:00:36,218 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 219 states. [2020-07-21 13:00:36,236 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 219 to 204. [2020-07-21 13:00:36,236 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 204 states. [2020-07-21 13:00:36,238 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 204 states to 204 states and 317 transitions. [2020-07-21 13:00:36,238 INFO L78 Accepts]: Start accepts. Automaton has 204 states and 317 transitions. Word has length 124 [2020-07-21 13:00:36,238 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:00:36,239 INFO L479 AbstractCegarLoop]: Abstraction has 204 states and 317 transitions. [2020-07-21 13:00:36,239 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-07-21 13:00:36,239 INFO L276 IsEmpty]: Start isEmpty. Operand 204 states and 317 transitions. [2020-07-21 13:00:36,241 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 125 [2020-07-21 13:00:36,241 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:00:36,241 INFO L422 BasicCegarLoop]: trace histogram [24, 24, 23, 4, 4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:00:36,455 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:00:36,456 INFO L427 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:00:36,456 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:00:36,456 INFO L82 PathProgramCache]: Analyzing trace with hash -786801318, now seen corresponding path program 1 times [2020-07-21 13:00:36,457 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:00:36,457 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1030491762] [2020-07-21 13:00:36,457 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 13:00:36,529 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:00:36,530 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:00:36,531 INFO L263 TraceCheckSpWp]: Trace formula consists of 316 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 13:00:36,533 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:00:36,555 INFO L134 CoverageAnalysis]: Checked inductivity of 858 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 858 trivial. 0 not checked. [2020-07-21 13:00:36,556 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 13:00:36,556 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1030491762] [2020-07-21 13:00:36,556 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 13:00:36,556 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-07-21 13:00:36,557 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [891157739] [2020-07-21 13:00:36,557 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-07-21 13:00:36,557 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:00:36,557 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-07-21 13:00:36,558 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-07-21 13:00:36,558 INFO L87 Difference]: Start difference. First operand 204 states and 317 transitions. Second operand 4 states. [2020-07-21 13:00:36,583 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:00:36,584 INFO L93 Difference]: Finished difference Result 214 states and 328 transitions. [2020-07-21 13:00:36,586 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-07-21 13:00:36,586 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 124 [2020-07-21 13:00:36,586 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:00:36,588 INFO L225 Difference]: With dead ends: 214 [2020-07-21 13:00:36,588 INFO L226 Difference]: Without dead ends: 202 [2020-07-21 13:00:36,588 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 124 GetRequests, 121 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-07-21 13:00:36,589 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 202 states. [2020-07-21 13:00:36,599 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 202 to 198. [2020-07-21 13:00:36,600 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 198 states. [2020-07-21 13:00:36,601 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 198 states to 198 states and 308 transitions. [2020-07-21 13:00:36,602 INFO L78 Accepts]: Start accepts. Automaton has 198 states and 308 transitions. Word has length 124 [2020-07-21 13:00:36,602 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:00:36,602 INFO L479 AbstractCegarLoop]: Abstraction has 198 states and 308 transitions. [2020-07-21 13:00:36,602 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-07-21 13:00:36,602 INFO L276 IsEmpty]: Start isEmpty. Operand 198 states and 308 transitions. [2020-07-21 13:00:36,604 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 125 [2020-07-21 13:00:36,604 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:00:36,604 INFO L422 BasicCegarLoop]: trace histogram [24, 24, 23, 4, 4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:00:36,816 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:00:36,817 INFO L427 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:00:36,817 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:00:36,818 INFO L82 PathProgramCache]: Analyzing trace with hash -2066035110, now seen corresponding path program 1 times [2020-07-21 13:00:36,818 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:00:36,819 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [896206915] [2020-07-21 13:00:36,819 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 13:00:36,889 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 13:00:36,889 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:00:36,890 INFO L263 TraceCheckSpWp]: Trace formula consists of 236 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-21 13:00:36,905 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:00:37,054 INFO L134 CoverageAnalysis]: Checked inductivity of 858 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 858 trivial. 0 not checked. [2020-07-21 13:00:37,054 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 13:00:37,055 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [896206915] [2020-07-21 13:00:37,055 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 13:00:37,055 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2020-07-21 13:00:37,055 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [554275989] [2020-07-21 13:00:37,056 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-07-21 13:00:37,056 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:00:37,056 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-07-21 13:00:37,057 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=41, Unknown=0, NotChecked=0, Total=56 [2020-07-21 13:00:37,057 INFO L87 Difference]: Start difference. First operand 198 states and 308 transitions. Second operand 8 states. [2020-07-21 13:00:37,267 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:00:37,267 INFO L93 Difference]: Finished difference Result 222 states and 339 transitions. [2020-07-21 13:00:37,270 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-21 13:00:37,271 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 124 [2020-07-21 13:00:37,271 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:00:37,274 INFO L225 Difference]: With dead ends: 222 [2020-07-21 13:00:37,274 INFO L226 Difference]: Without dead ends: 217 [2020-07-21 13:00:37,275 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 125 GetRequests, 117 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=24, Invalid=66, Unknown=0, NotChecked=0, Total=90 [2020-07-21 13:00:37,276 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 217 states. [2020-07-21 13:00:37,288 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 217 to 205. [2020-07-21 13:00:37,288 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 205 states. [2020-07-21 13:00:37,290 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 205 states to 205 states and 316 transitions. [2020-07-21 13:00:37,291 INFO L78 Accepts]: Start accepts. Automaton has 205 states and 316 transitions. Word has length 124 [2020-07-21 13:00:37,291 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:00:37,291 INFO L479 AbstractCegarLoop]: Abstraction has 205 states and 316 transitions. [2020-07-21 13:00:37,291 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-07-21 13:00:37,292 INFO L276 IsEmpty]: Start isEmpty. Operand 205 states and 316 transitions. [2020-07-21 13:00:37,293 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 125 [2020-07-21 13:00:37,293 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:00:37,293 INFO L422 BasicCegarLoop]: trace histogram [24, 24, 23, 4, 4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:00:37,507 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:00:37,508 INFO L427 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:00:37,508 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:00:37,508 INFO L82 PathProgramCache]: Analyzing trace with hash -1807869672, now seen corresponding path program 1 times [2020-07-21 13:00:37,509 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:00:37,509 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [343924282] [2020-07-21 13:00:37,509 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 13:00:37,585 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:00:37,585 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:00:37,587 INFO L263 TraceCheckSpWp]: Trace formula consists of 316 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-21 13:00:37,589 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:00:37,662 INFO L134 CoverageAnalysis]: Checked inductivity of 858 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 849 trivial. 0 not checked. [2020-07-21 13:00:37,662 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:00:37,748 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [343924282] [2020-07-21 13:00:37,749 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-21 13:00:37,749 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-07-21 13:00:37,749 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [130739074] [2020-07-21 13:00:37,751 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-07-21 13:00:37,752 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:00:37,752 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-07-21 13:00:37,752 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2020-07-21 13:00:37,752 INFO L87 Difference]: Start difference. First operand 205 states and 316 transitions. Second operand 7 states. [2020-07-21 13:00:37,875 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:00:37,875 INFO L93 Difference]: Finished difference Result 232 states and 354 transitions. [2020-07-21 13:00:37,876 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-21 13:00:37,876 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 124 [2020-07-21 13:00:37,877 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:00:37,879 INFO L225 Difference]: With dead ends: 232 [2020-07-21 13:00:37,879 INFO L226 Difference]: Without dead ends: 227 [2020-07-21 13:00:37,880 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 144 GetRequests, 135 SyntacticMatches, 1 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=23, Invalid=67, Unknown=0, NotChecked=0, Total=90 [2020-07-21 13:00:37,880 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 227 states. [2020-07-21 13:00:37,895 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 227 to 218. [2020-07-21 13:00:37,896 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 218 states. [2020-07-21 13:00:37,897 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 218 states to 218 states and 339 transitions. [2020-07-21 13:00:37,898 INFO L78 Accepts]: Start accepts. Automaton has 218 states and 339 transitions. Word has length 124 [2020-07-21 13:00:37,898 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:00:37,898 INFO L479 AbstractCegarLoop]: Abstraction has 218 states and 339 transitions. [2020-07-21 13:00:37,898 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-07-21 13:00:37,898 INFO L276 IsEmpty]: Start isEmpty. Operand 218 states and 339 transitions. [2020-07-21 13:00:37,900 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 127 [2020-07-21 13:00:37,900 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:00:37,900 INFO L422 BasicCegarLoop]: trace histogram [24, 24, 23, 4, 4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:00:38,114 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:00:38,115 INFO L427 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:00:38,116 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:00:38,116 INFO L82 PathProgramCache]: Analyzing trace with hash -1419572994, now seen corresponding path program 1 times [2020-07-21 13:00:38,117 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:00:38,117 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [28372303] [2020-07-21 13:00:38,118 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 13:00:38,197 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:00:38,198 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:00:38,199 INFO L263 TraceCheckSpWp]: Trace formula consists of 325 conjuncts, 13 conjunts are in the unsatisfiable core [2020-07-21 13:00:38,202 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:00:38,288 INFO L134 CoverageAnalysis]: Checked inductivity of 858 backedges. 9 proven. 0 refuted. 0 times theorem prover too weak. 849 trivial. 0 not checked. [2020-07-21 13:00:38,289 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 13:00:38,289 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [28372303] [2020-07-21 13:00:38,289 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 13:00:38,289 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2020-07-21 13:00:38,292 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [149369498] [2020-07-21 13:00:38,294 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-07-21 13:00:38,295 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:00:38,295 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-07-21 13:00:38,295 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2020-07-21 13:00:38,295 INFO L87 Difference]: Start difference. First operand 218 states and 339 transitions. Second operand 8 states. [2020-07-21 13:00:38,493 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:00:38,493 INFO L93 Difference]: Finished difference Result 262 states and 401 transitions. [2020-07-21 13:00:38,494 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-21 13:00:38,495 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 126 [2020-07-21 13:00:38,495 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:00:38,498 INFO L225 Difference]: With dead ends: 262 [2020-07-21 13:00:38,499 INFO L226 Difference]: Without dead ends: 249 [2020-07-21 13:00:38,500 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 127 GetRequests, 119 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=21, Invalid=69, Unknown=0, NotChecked=0, Total=90 [2020-07-21 13:00:38,501 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 249 states. [2020-07-21 13:00:38,529 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 249 to 231. [2020-07-21 13:00:38,530 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 231 states. [2020-07-21 13:00:38,533 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 231 states to 231 states and 355 transitions. [2020-07-21 13:00:38,533 INFO L78 Accepts]: Start accepts. Automaton has 231 states and 355 transitions. Word has length 126 [2020-07-21 13:00:38,534 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:00:38,534 INFO L479 AbstractCegarLoop]: Abstraction has 231 states and 355 transitions. [2020-07-21 13:00:38,534 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-07-21 13:00:38,535 INFO L276 IsEmpty]: Start isEmpty. Operand 231 states and 355 transitions. [2020-07-21 13:00:38,539 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 127 [2020-07-21 13:00:38,539 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:00:38,539 INFO L422 BasicCegarLoop]: trace histogram [24, 24, 23, 4, 4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:00:38,754 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:00:38,755 INFO L427 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:00:38,756 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:00:38,756 INFO L82 PathProgramCache]: Analyzing trace with hash 1864277052, now seen corresponding path program 1 times [2020-07-21 13:00:38,757 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:00:38,757 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [58869125] [2020-07-21 13:00:38,757 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 13:00:38,884 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:00:38,885 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:00:38,887 INFO L263 TraceCheckSpWp]: Trace formula consists of 319 conjuncts, 7 conjunts are in the unsatisfiable core [2020-07-21 13:00:38,891 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:00:38,943 INFO L134 CoverageAnalysis]: Checked inductivity of 858 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 858 trivial. 0 not checked. [2020-07-21 13:00:38,943 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 13:00:38,944 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [58869125] [2020-07-21 13:00:38,944 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 13:00:38,944 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2020-07-21 13:00:38,945 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [560292205] [2020-07-21 13:00:38,948 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-07-21 13:00:38,949 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:00:38,949 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-07-21 13:00:38,949 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2020-07-21 13:00:38,950 INFO L87 Difference]: Start difference. First operand 231 states and 355 transitions. Second operand 6 states. [2020-07-21 13:00:39,022 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:00:39,023 INFO L93 Difference]: Finished difference Result 237 states and 360 transitions. [2020-07-21 13:00:39,024 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-21 13:00:39,025 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 126 [2020-07-21 13:00:39,025 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:00:39,028 INFO L225 Difference]: With dead ends: 237 [2020-07-21 13:00:39,028 INFO L226 Difference]: Without dead ends: 231 [2020-07-21 13:00:39,029 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 127 GetRequests, 121 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 13:00:39,029 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 231 states. [2020-07-21 13:00:39,057 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 231 to 231. [2020-07-21 13:00:39,057 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 231 states. [2020-07-21 13:00:39,064 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 231 states to 231 states and 354 transitions. [2020-07-21 13:00:39,065 INFO L78 Accepts]: Start accepts. Automaton has 231 states and 354 transitions. Word has length 126 [2020-07-21 13:00:39,065 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:00:39,065 INFO L479 AbstractCegarLoop]: Abstraction has 231 states and 354 transitions. [2020-07-21 13:00:39,066 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-07-21 13:00:39,066 INFO L276 IsEmpty]: Start isEmpty. Operand 231 states and 354 transitions. [2020-07-21 13:00:39,069 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 127 [2020-07-21 13:00:39,069 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:00:39,069 INFO L422 BasicCegarLoop]: trace histogram [24, 24, 23, 4, 4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:00:39,282 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:00:39,283 INFO L427 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:00:39,283 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:00:39,283 INFO L82 PathProgramCache]: Analyzing trace with hash 1807018750, now seen corresponding path program 1 times [2020-07-21 13:00:39,284 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:00:39,284 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1641347691] [2020-07-21 13:00:39,284 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 13:00:39,377 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:00:39,377 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:00:39,378 INFO L263 TraceCheckSpWp]: Trace formula consists of 319 conjuncts, 9 conjunts are in the unsatisfiable core [2020-07-21 13:00:39,380 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:00:39,412 INFO L134 CoverageAnalysis]: Checked inductivity of 858 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 858 trivial. 0 not checked. [2020-07-21 13:00:39,413 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 13:00:39,413 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1641347691] [2020-07-21 13:00:39,413 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 13:00:39,413 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2020-07-21 13:00:39,413 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [218062252] [2020-07-21 13:00:39,414 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-07-21 13:00:39,414 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:00:39,414 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-07-21 13:00:39,414 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2020-07-21 13:00:39,415 INFO L87 Difference]: Start difference. First operand 231 states and 354 transitions. Second operand 6 states. [2020-07-21 13:00:39,491 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:00:39,491 INFO L93 Difference]: Finished difference Result 248 states and 372 transitions. [2020-07-21 13:00:39,492 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-21 13:00:39,492 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 126 [2020-07-21 13:00:39,493 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:00:39,495 INFO L225 Difference]: With dead ends: 248 [2020-07-21 13:00:39,495 INFO L226 Difference]: Without dead ends: 230 [2020-07-21 13:00:39,497 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 126 GetRequests, 121 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2020-07-21 13:00:39,497 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 230 states. [2020-07-21 13:00:39,512 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 230 to 229. [2020-07-21 13:00:39,513 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 229 states. [2020-07-21 13:00:39,515 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 229 states to 229 states and 345 transitions. [2020-07-21 13:00:39,515 INFO L78 Accepts]: Start accepts. Automaton has 229 states and 345 transitions. Word has length 126 [2020-07-21 13:00:39,515 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:00:39,516 INFO L479 AbstractCegarLoop]: Abstraction has 229 states and 345 transitions. [2020-07-21 13:00:39,516 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-07-21 13:00:39,516 INFO L276 IsEmpty]: Start isEmpty. Operand 229 states and 345 transitions. [2020-07-21 13:00:39,518 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 129 [2020-07-21 13:00:39,518 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:00:39,518 INFO L422 BasicCegarLoop]: trace histogram [24, 24, 23, 4, 4, 4, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:00:39,733 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:00:39,733 INFO L427 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:00:39,733 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:00:39,734 INFO L82 PathProgramCache]: Analyzing trace with hash -1656833207, now seen corresponding path program 1 times [2020-07-21 13:00:39,734 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:00:39,734 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1628015577] [2020-07-21 13:00:39,735 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 13:00:39,811 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:00:39,812 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:00:39,813 INFO L263 TraceCheckSpWp]: Trace formula consists of 319 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-21 13:00:39,816 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:00:39,977 INFO L134 CoverageAnalysis]: Checked inductivity of 859 backedges. 3 proven. 12 refuted. 0 times theorem prover too weak. 844 trivial. 0 not checked. [2020-07-21 13:00:39,977 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:00:40,072 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 3 conjuncts [2020-07-21 13:00:40,527 INFO L134 CoverageAnalysis]: Checked inductivity of 859 backedges. 3 proven. 12 refuted. 0 times theorem prover too weak. 844 trivial. 0 not checked. [2020-07-21 13:00:40,527 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1628015577] [2020-07-21 13:00:40,528 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:00:40,528 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 11] total 19 [2020-07-21 13:00:40,528 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1204866042] [2020-07-21 13:00:40,529 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-07-21 13:00:40,529 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:00:40,529 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-07-21 13:00:40,529 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=292, Unknown=0, NotChecked=0, Total=342 [2020-07-21 13:00:40,529 INFO L87 Difference]: Start difference. First operand 229 states and 345 transitions. Second operand 19 states. [2020-07-21 13:00:40,863 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:00:40,863 INFO L93 Difference]: Finished difference Result 276 states and 408 transitions. [2020-07-21 13:00:40,865 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-21 13:00:40,865 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 128 [2020-07-21 13:00:40,865 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:00:40,867 INFO L225 Difference]: With dead ends: 276 [2020-07-21 13:00:40,867 INFO L226 Difference]: Without dead ends: 218 [2020-07-21 13:00:40,868 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 257 GetRequests, 237 SyntacticMatches, 1 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 57 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=62, Invalid=358, Unknown=0, NotChecked=0, Total=420 [2020-07-21 13:00:40,869 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 218 states. [2020-07-21 13:00:40,886 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 218 to 207. [2020-07-21 13:00:40,887 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 207 states. [2020-07-21 13:00:40,888 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 207 states to 207 states and 313 transitions. [2020-07-21 13:00:40,889 INFO L78 Accepts]: Start accepts. Automaton has 207 states and 313 transitions. Word has length 128 [2020-07-21 13:00:40,890 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:00:40,890 INFO L479 AbstractCegarLoop]: Abstraction has 207 states and 313 transitions. [2020-07-21 13:00:40,890 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-07-21 13:00:40,890 INFO L276 IsEmpty]: Start isEmpty. Operand 207 states and 313 transitions. [2020-07-21 13:00:40,892 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 132 [2020-07-21 13:00:40,892 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:00:40,892 INFO L422 BasicCegarLoop]: trace histogram [24, 24, 23, 4, 4, 4, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:00:41,105 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:00:41,106 INFO L427 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:00:41,106 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:00:41,106 INFO L82 PathProgramCache]: Analyzing trace with hash 273720313, now seen corresponding path program 1 times [2020-07-21 13:00:41,106 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:00:41,107 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1532525331] [2020-07-21 13:00:41,107 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 13:00:41,185 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:00:41,185 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:00:41,186 INFO L263 TraceCheckSpWp]: Trace formula consists of 332 conjuncts, 17 conjunts are in the unsatisfiable core [2020-07-21 13:00:41,188 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:00:41,267 INFO L134 CoverageAnalysis]: Checked inductivity of 859 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 850 trivial. 0 not checked. [2020-07-21 13:00:41,268 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:00:41,606 INFO L134 CoverageAnalysis]: Checked inductivity of 859 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 850 trivial. 0 not checked. [2020-07-21 13:00:41,606 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1532525331] [2020-07-21 13:00:41,607 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:00:41,607 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 15 [2020-07-21 13:00:41,607 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [445043971] [2020-07-21 13:00:41,609 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-21 13:00:41,609 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:00:41,609 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-21 13:00:41,609 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=175, Unknown=0, NotChecked=0, Total=210 [2020-07-21 13:00:41,610 INFO L87 Difference]: Start difference. First operand 207 states and 313 transitions. Second operand 15 states. [2020-07-21 13:00:41,905 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:00:41,905 INFO L93 Difference]: Finished difference Result 234 states and 348 transitions. [2020-07-21 13:00:41,907 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-21 13:00:41,907 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 131 [2020-07-21 13:00:41,907 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:00:41,909 INFO L225 Difference]: With dead ends: 234 [2020-07-21 13:00:41,909 INFO L226 Difference]: Without dead ends: 214 [2020-07-21 13:00:41,910 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 265 GetRequests, 246 SyntacticMatches, 2 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 21 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=59, Invalid=283, Unknown=0, NotChecked=0, Total=342 [2020-07-21 13:00:41,910 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 214 states. [2020-07-21 13:00:41,923 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 214 to 204. [2020-07-21 13:00:41,924 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 204 states. [2020-07-21 13:00:41,925 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 204 states to 204 states and 262 transitions. [2020-07-21 13:00:41,925 INFO L78 Accepts]: Start accepts. Automaton has 204 states and 262 transitions. Word has length 131 [2020-07-21 13:00:41,926 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:00:41,926 INFO L479 AbstractCegarLoop]: Abstraction has 204 states and 262 transitions. [2020-07-21 13:00:41,926 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-21 13:00:41,926 INFO L276 IsEmpty]: Start isEmpty. Operand 204 states and 262 transitions. [2020-07-21 13:00:41,928 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 136 [2020-07-21 13:00:41,928 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:00:41,928 INFO L422 BasicCegarLoop]: trace histogram [24, 24, 23, 4, 4, 4, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:00:42,142 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:00:42,143 INFO L427 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:00:42,143 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:00:42,144 INFO L82 PathProgramCache]: Analyzing trace with hash 681202148, now seen corresponding path program 1 times [2020-07-21 13:00:42,144 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:00:42,144 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1424764063] [2020-07-21 13:00:42,144 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 13:00:42,380 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:00:42,381 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:00:42,382 INFO L263 TraceCheckSpWp]: Trace formula consists of 334 conjuncts, 19 conjunts are in the unsatisfiable core [2020-07-21 13:00:42,385 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:00:42,505 INFO L134 CoverageAnalysis]: Checked inductivity of 864 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 855 trivial. 0 not checked. [2020-07-21 13:00:42,506 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:00:42,781 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1424764063] [2020-07-21 13:00:42,782 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-21 13:00:42,782 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-07-21 13:00:42,782 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [503417693] [2020-07-21 13:00:42,783 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-07-21 13:00:42,783 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:00:42,783 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-07-21 13:00:42,784 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=149, Unknown=0, NotChecked=0, Total=182 [2020-07-21 13:00:42,784 INFO L87 Difference]: Start difference. First operand 204 states and 262 transitions. Second operand 10 states. [2020-07-21 13:00:42,984 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:00:42,984 INFO L93 Difference]: Finished difference Result 224 states and 285 transitions. [2020-07-21 13:00:42,986 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-21 13:00:42,986 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 135 [2020-07-21 13:00:42,986 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:00:42,988 INFO L225 Difference]: With dead ends: 224 [2020-07-21 13:00:42,988 INFO L226 Difference]: Without dead ends: 204 [2020-07-21 13:00:42,989 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 159 GetRequests, 140 SyntacticMatches, 4 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=49, Invalid=223, Unknown=0, NotChecked=0, Total=272 [2020-07-21 13:00:42,990 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 204 states. [2020-07-21 13:00:43,003 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 204 to 204. [2020-07-21 13:00:43,003 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 204 states. [2020-07-21 13:00:43,004 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 204 states to 204 states and 261 transitions. [2020-07-21 13:00:43,004 INFO L78 Accepts]: Start accepts. Automaton has 204 states and 261 transitions. Word has length 135 [2020-07-21 13:00:43,005 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:00:43,005 INFO L479 AbstractCegarLoop]: Abstraction has 204 states and 261 transitions. [2020-07-21 13:00:43,005 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-07-21 13:00:43,005 INFO L276 IsEmpty]: Start isEmpty. Operand 204 states and 261 transitions. [2020-07-21 13:00:43,006 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 136 [2020-07-21 13:00:43,007 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:00:43,007 INFO L422 BasicCegarLoop]: trace histogram [24, 24, 23, 4, 4, 4, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:00:43,211 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:00:43,211 INFO L427 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:00:43,211 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:00:43,212 INFO L82 PathProgramCache]: Analyzing trace with hash -598661530, now seen corresponding path program 1 times [2020-07-21 13:00:43,212 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:00:43,212 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [946894845] [2020-07-21 13:00:43,213 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