/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample FPandBPonlyIfFpWasNotPerfect -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.assert.codeblocks SMT_FEATURE_HEURISTIC --traceabstraction.assert.codeblocks.term.scoring.heuristic NUM_VARIABLES --traceabstraction.assert.codeblocks.term.scoring.heuristic.partitioning.strategy FIXED_NUM_PARTITIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.number.of.partitions 4 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loops/verisec_OpenSER_cases1_stripFullBoth_arr.i -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-20 17:43:28,237 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-20 17:43:28,240 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-20 17:43:28,261 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-20 17:43:28,261 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-20 17:43:28,263 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-20 17:43:28,265 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-20 17:43:28,266 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-20 17:43:28,268 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-20 17:43:28,269 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-20 17:43:28,270 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-20 17:43:28,271 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-20 17:43:28,272 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-20 17:43:28,273 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-20 17:43:28,274 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-20 17:43:28,275 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-20 17:43:28,276 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-20 17:43:28,277 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-20 17:43:28,279 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-20 17:43:28,281 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-20 17:43:28,282 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-20 17:43:28,283 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-20 17:43:28,285 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-20 17:43:28,286 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-20 17:43:28,288 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-07-20 17:43:28,288 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-07-20 17:43:28,289 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-07-20 17:43:28,290 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-07-20 17:43:28,290 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-07-20 17:43:28,291 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... 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[2020-07-20 17:43:28,296 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-20 17:43:28,297 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-20 17:43:28,297 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-20 17:43:28,298 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-07-20 17:43:28,313 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-20 17:43:28,314 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-20 17:43:28,315 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-20 17:43:28,315 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-20 17:43:28,316 INFO L138 SettingsManager]: * Use SBE=true [2020-07-20 17:43:28,316 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-20 17:43:28,316 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-20 17:43:28,316 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-20 17:43:28,316 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-20 17:43:28,317 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-20 17:43:28,317 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-20 17:43:28,317 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-20 17:43:28,317 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-20 17:43:28,317 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-20 17:43:28,318 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-20 17:43:28,318 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-20 17:43:28,318 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-20 17:43:28,318 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-20 17:43:28,318 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-20 17:43:28,319 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-20 17:43:28,319 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-20 17:43:28,319 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 17:43:28,319 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-20 17:43:28,319 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-20 17:43:28,320 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-20 17:43:28,320 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-20 17:43:28,320 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:43:28,320 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-20 17:43:28,320 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-20 17:43:28,321 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> FPandBPonlyIfFpWasNotPerfect Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks -> SMT_FEATURE_HEURISTIC Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic -> NUM_VARIABLES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic Partitioning Strategy -> FIXED_NUM_PARTITIONS Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic number of partitions -> 4 [2020-07-20 17:43:28,644 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-20 17:43:28,663 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-20 17:43:28,667 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-20 17:43:28,669 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-20 17:43:28,669 INFO L275 PluginConnector]: CDTParser initialized [2020-07-20 17:43:28,671 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops/verisec_OpenSER_cases1_stripFullBoth_arr.i [2020-07-20 17:43:28,740 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/64ea42ed2/22b0928acf00488da4c11359399025ad/FLAG748d84d19 [2020-07-20 17:43:29,197 INFO L306 CDTParser]: Found 1 translation units. [2020-07-20 17:43:29,198 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loops/verisec_OpenSER_cases1_stripFullBoth_arr.i [2020-07-20 17:43:29,206 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/64ea42ed2/22b0928acf00488da4c11359399025ad/FLAG748d84d19 [2020-07-20 17:43:29,588 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/64ea42ed2/22b0928acf00488da4c11359399025ad [2020-07-20 17:43:29,597 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-20 17:43:29,599 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-20 17:43:29,600 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-20 17:43:29,601 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-20 17:43:29,604 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-20 17:43:29,606 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 05:43:29" (1/1) ... [2020-07-20 17:43:29,609 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@58818f2d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:43:29, skipping insertion in model container [2020-07-20 17:43:29,609 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 05:43:29" (1/1) ... [2020-07-20 17:43:29,617 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-20 17:43:29,641 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-20 17:43:29,856 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 17:43:29,875 INFO L203 MainTranslator]: Completed pre-run [2020-07-20 17:43:30,077 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 17:43:30,101 INFO L208 MainTranslator]: Completed translation [2020-07-20 17:43:30,102 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:43:30 WrapperNode [2020-07-20 17:43:30,102 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-20 17:43:30,103 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-20 17:43:30,103 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-20 17:43:30,104 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-20 17:43:30,127 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:43:30" (1/1) ... [2020-07-20 17:43:30,127 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:43:30" (1/1) ... [2020-07-20 17:43:30,140 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:43:30" (1/1) ... [2020-07-20 17:43:30,140 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:43:30" (1/1) ... [2020-07-20 17:43:30,153 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:43:30" (1/1) ... [2020-07-20 17:43:30,160 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:43:30" (1/1) ... [2020-07-20 17:43:30,167 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:43:30" (1/1) ... [2020-07-20 17:43:30,176 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-20 17:43:30,177 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-20 17:43:30,177 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-20 17:43:30,177 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-20 17:43:30,179 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:43:30" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 17:43:30,285 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-20 17:43:30,285 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-20 17:43:30,285 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-07-20 17:43:30,286 INFO L138 BoogieDeclarations]: Found implementation of procedure r_strncpy [2020-07-20 17:43:30,286 INFO L138 BoogieDeclarations]: Found implementation of procedure parse_expression_list [2020-07-20 17:43:30,286 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-20 17:43:30,286 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-20 17:43:30,286 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-07-20 17:43:30,287 INFO L130 BoogieDeclarations]: Found specification of procedure strchr [2020-07-20 17:43:30,287 INFO L130 BoogieDeclarations]: Found specification of procedure strrchr [2020-07-20 17:43:30,287 INFO L130 BoogieDeclarations]: Found specification of procedure strstr [2020-07-20 17:43:30,287 INFO L130 BoogieDeclarations]: Found specification of procedure strncpy [2020-07-20 17:43:30,287 INFO L130 BoogieDeclarations]: Found specification of procedure strncpy_ptr [2020-07-20 17:43:30,288 INFO L130 BoogieDeclarations]: Found specification of procedure strcpy [2020-07-20 17:43:30,288 INFO L130 BoogieDeclarations]: Found specification of procedure strlen [2020-07-20 17:43:30,288 INFO L130 BoogieDeclarations]: Found specification of procedure strncmp [2020-07-20 17:43:30,288 INFO L130 BoogieDeclarations]: Found specification of procedure strcmp [2020-07-20 17:43:30,288 INFO L130 BoogieDeclarations]: Found specification of procedure strcat [2020-07-20 17:43:30,288 INFO L130 BoogieDeclarations]: Found specification of procedure memcpy [2020-07-20 17:43:30,289 INFO L130 BoogieDeclarations]: Found specification of procedure isascii [2020-07-20 17:43:30,289 INFO L130 BoogieDeclarations]: Found specification of procedure isspace [2020-07-20 17:43:30,289 INFO L130 BoogieDeclarations]: Found specification of procedure getc [2020-07-20 17:43:30,289 INFO L130 BoogieDeclarations]: Found specification of procedure strrand [2020-07-20 17:43:30,289 INFO L130 BoogieDeclarations]: Found specification of procedure istrrand [2020-07-20 17:43:30,290 INFO L130 BoogieDeclarations]: Found specification of procedure istrchr [2020-07-20 17:43:30,290 INFO L130 BoogieDeclarations]: Found specification of procedure istrrchr [2020-07-20 17:43:30,290 INFO L130 BoogieDeclarations]: Found specification of procedure istrncmp [2020-07-20 17:43:30,290 INFO L130 BoogieDeclarations]: Found specification of procedure istrstr [2020-07-20 17:43:30,290 INFO L130 BoogieDeclarations]: Found specification of procedure r_strncpy [2020-07-20 17:43:30,291 INFO L130 BoogieDeclarations]: Found specification of procedure r_strcpy [2020-07-20 17:43:30,291 INFO L130 BoogieDeclarations]: Found specification of procedure r_strcat [2020-07-20 17:43:30,291 INFO L130 BoogieDeclarations]: Found specification of procedure r_strncat [2020-07-20 17:43:30,291 INFO L130 BoogieDeclarations]: Found specification of procedure r_memcpy [2020-07-20 17:43:30,291 INFO L130 BoogieDeclarations]: Found specification of procedure parse_expression_list [2020-07-20 17:43:30,291 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-07-20 17:43:30,292 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-07-20 17:43:30,292 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-07-20 17:43:30,292 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-07-20 17:43:30,292 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-20 17:43:30,292 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-20 17:43:30,292 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-20 17:43:30,780 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-20 17:43:30,780 INFO L295 CfgBuilder]: Removed 3 assume(true) statements. [2020-07-20 17:43:30,787 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 05:43:30 BoogieIcfgContainer [2020-07-20 17:43:30,787 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-20 17:43:30,788 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-20 17:43:30,788 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-20 17:43:30,790 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-20 17:43:30,791 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.07 05:43:29" (1/3) ... [2020-07-20 17:43:30,791 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6cb34d4e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 05:43:30, skipping insertion in model container [2020-07-20 17:43:30,792 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:43:30" (2/3) ... [2020-07-20 17:43:30,792 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6cb34d4e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 05:43:30, skipping insertion in model container [2020-07-20 17:43:30,793 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 05:43:30" (3/3) ... [2020-07-20 17:43:30,794 INFO L109 eAbstractionObserver]: Analyzing ICFG verisec_OpenSER_cases1_stripFullBoth_arr.i [2020-07-20 17:43:30,804 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-20 17:43:30,812 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-20 17:43:30,823 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-20 17:43:30,847 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-20 17:43:30,847 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-20 17:43:30,848 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-20 17:43:30,848 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-20 17:43:30,848 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-20 17:43:30,848 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-20 17:43:30,849 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-20 17:43:30,849 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-20 17:43:30,871 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states. [2020-07-20 17:43:30,879 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2020-07-20 17:43:30,879 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:43:30,881 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:43:30,881 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:43:30,888 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:43:30,888 INFO L82 PathProgramCache]: Analyzing trace with hash -2018987797, now seen corresponding path program 1 times [2020-07-20 17:43:30,897 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:43:30,898 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1701005020] [2020-07-20 17:43:30,898 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 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 [2020-07-20 17:43:31,133 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 17:43:31,133 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:43:31,141 INFO L263 TraceCheckSpWp]: Trace formula consists of 97 conjuncts, 5 conjunts are in the unsatisfiable core [2020-07-20 17:43:31,149 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:43:31,231 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 17:43:31,255 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 17:43:31,256 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 17:43:31,258 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1701005020] [2020-07-20 17:43:31,259 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 17:43:31,259 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2020-07-20 17:43:31,260 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1287793363] [2020-07-20 17:43:31,266 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-07-20 17:43:31,266 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:43:31,277 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-07-20 17:43:31,278 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2020-07-20 17:43:31,280 INFO L87 Difference]: Start difference. First operand 51 states. Second operand 6 states. [2020-07-20 17:43:31,492 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:43:31,493 INFO L93 Difference]: Finished difference Result 139 states and 195 transitions. [2020-07-20 17:43:31,494 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-20 17:43:31,495 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 29 [2020-07-20 17:43:31,496 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:43:31,507 INFO L225 Difference]: With dead ends: 139 [2020-07-20 17:43:31,508 INFO L226 Difference]: Without dead ends: 81 [2020-07-20 17:43:31,512 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 24 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=26, Invalid=46, Unknown=0, NotChecked=0, Total=72 [2020-07-20 17:43:31,532 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 81 states. [2020-07-20 17:43:31,567 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 81 to 59. [2020-07-20 17:43:31,569 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 59 states. [2020-07-20 17:43:31,571 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 75 transitions. [2020-07-20 17:43:31,573 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 75 transitions. Word has length 29 [2020-07-20 17:43:31,573 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:43:31,573 INFO L479 AbstractCegarLoop]: Abstraction has 59 states and 75 transitions. [2020-07-20 17:43:31,574 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-07-20 17:43:31,574 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 75 transitions. [2020-07-20 17:43:31,576 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2020-07-20 17:43:31,576 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:43:31,576 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:43:31,791 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:43:31,792 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:43:31,792 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:43:31,793 INFO L82 PathProgramCache]: Analyzing trace with hash 787449890, now seen corresponding path program 1 times [2020-07-20 17:43:31,793 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:43:31,794 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1546042196] [2020-07-20 17:43:31,795 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 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 [2020-07-20 17:43:31,929 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 17:43:31,930 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:43:31,931 INFO L263 TraceCheckSpWp]: Trace formula consists of 97 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-20 17:43:31,936 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:43:32,030 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 17:43:32,031 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 17:43:32,031 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1546042196] [2020-07-20 17:43:32,032 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 17:43:32,032 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2020-07-20 17:43:32,033 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [981537568] [2020-07-20 17:43:32,036 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-07-20 17:43:32,036 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:43:32,037 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-07-20 17:43:32,038 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-07-20 17:43:32,038 INFO L87 Difference]: Start difference. First operand 59 states and 75 transitions. Second operand 6 states. [2020-07-20 17:43:32,245 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:43:32,245 INFO L93 Difference]: Finished difference Result 120 states and 153 transitions. [2020-07-20 17:43:32,247 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-20 17:43:32,247 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 33 [2020-07-20 17:43:32,248 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:43:32,249 INFO L225 Difference]: With dead ends: 120 [2020-07-20 17:43:32,249 INFO L226 Difference]: Without dead ends: 70 [2020-07-20 17:43:32,252 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 28 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=16, Invalid=26, Unknown=0, NotChecked=0, Total=42 [2020-07-20 17:43:32,253 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2020-07-20 17:43:32,270 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 59. [2020-07-20 17:43:32,276 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 59 states. [2020-07-20 17:43:32,279 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 73 transitions. [2020-07-20 17:43:32,279 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 73 transitions. Word has length 33 [2020-07-20 17:43:32,280 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:43:32,280 INFO L479 AbstractCegarLoop]: Abstraction has 59 states and 73 transitions. [2020-07-20 17:43:32,280 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-07-20 17:43:32,280 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 73 transitions. [2020-07-20 17:43:32,281 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2020-07-20 17:43:32,282 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:43:32,282 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:43:32,497 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:43:32,497 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:43:32,498 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:43:32,498 INFO L82 PathProgramCache]: Analyzing trace with hash -1206694816, now seen corresponding path program 1 times [2020-07-20 17:43:32,499 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:43:32,500 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [170875906] [2020-07-20 17:43:32,500 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 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 [2020-07-20 17:43:32,562 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 17:43:32,562 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:43:32,564 INFO L263 TraceCheckSpWp]: Trace formula consists of 104 conjuncts, 5 conjunts are in the unsatisfiable core [2020-07-20 17:43:32,566 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:43:32,608 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 17:43:32,609 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 17:43:32,609 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [170875906] [2020-07-20 17:43:32,609 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 17:43:32,610 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-20 17:43:32,610 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1222270284] [2020-07-20 17:43:32,610 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-20 17:43:32,611 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:43:32,611 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-20 17:43:32,611 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2020-07-20 17:43:32,612 INFO L87 Difference]: Start difference. First operand 59 states and 73 transitions. Second operand 5 states. [2020-07-20 17:43:32,717 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:43:32,718 INFO L93 Difference]: Finished difference Result 111 states and 138 transitions. [2020-07-20 17:43:32,718 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-20 17:43:32,718 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 33 [2020-07-20 17:43:32,719 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:43:32,720 INFO L225 Difference]: With dead ends: 111 [2020-07-20 17:43:32,720 INFO L226 Difference]: Without dead ends: 61 [2020-07-20 17:43:32,721 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 29 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=18, Invalid=24, Unknown=0, NotChecked=0, Total=42 [2020-07-20 17:43:32,721 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2020-07-20 17:43:32,726 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 46. [2020-07-20 17:43:32,727 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-07-20 17:43:32,728 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 55 transitions. [2020-07-20 17:43:32,728 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 55 transitions. Word has length 33 [2020-07-20 17:43:32,728 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:43:32,728 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 55 transitions. [2020-07-20 17:43:32,728 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-20 17:43:32,729 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 55 transitions. [2020-07-20 17:43:32,729 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2020-07-20 17:43:32,730 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:43:32,730 INFO L422 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:43:32,943 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:43:32,944 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:43:32,945 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:43:32,945 INFO L82 PathProgramCache]: Analyzing trace with hash -2113767347, now seen corresponding path program 1 times [2020-07-20 17:43:32,945 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:43:32,946 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1269872256] [2020-07-20 17:43:32,946 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 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 [2020-07-20 17:43:33,039 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 17:43:33,040 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:43:33,041 INFO L263 TraceCheckSpWp]: Trace formula consists of 108 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-20 17:43:33,047 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:43:33,092 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 17:43:33,109 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 17:43:33,110 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 17:43:33,132 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:43:33,185 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 17:43:33,187 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1269872256] [2020-07-20 17:43:33,187 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 17:43:33,187 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 7 [2020-07-20 17:43:33,188 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1845754024] [2020-07-20 17:43:33,189 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-07-20 17:43:33,189 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:43:33,190 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-07-20 17:43:33,191 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2020-07-20 17:43:33,191 INFO L87 Difference]: Start difference. First operand 46 states and 55 transitions. Second operand 7 states. [2020-07-20 17:43:33,367 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:43:33,367 INFO L93 Difference]: Finished difference Result 121 states and 153 transitions. [2020-07-20 17:43:33,367 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-20 17:43:33,368 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 38 [2020-07-20 17:43:33,368 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:43:33,370 INFO L225 Difference]: With dead ends: 121 [2020-07-20 17:43:33,370 INFO L226 Difference]: Without dead ends: 86 [2020-07-20 17:43:33,371 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 79 GetRequests, 67 SyntacticMatches, 3 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=38, Invalid=72, Unknown=0, NotChecked=0, Total=110 [2020-07-20 17:43:33,372 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 86 states. [2020-07-20 17:43:33,390 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 86 to 64. [2020-07-20 17:43:33,391 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 64 states. [2020-07-20 17:43:33,392 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 80 transitions. [2020-07-20 17:43:33,393 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 80 transitions. Word has length 38 [2020-07-20 17:43:33,393 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:43:33,393 INFO L479 AbstractCegarLoop]: Abstraction has 64 states and 80 transitions. [2020-07-20 17:43:33,393 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-07-20 17:43:33,394 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 80 transitions. [2020-07-20 17:43:33,398 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2020-07-20 17:43:33,399 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:43:33,399 INFO L422 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:43:33,613 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:43:33,614 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:43:33,614 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:43:33,614 INFO L82 PathProgramCache]: Analyzing trace with hash -1154537331, now seen corresponding path program 1 times [2020-07-20 17:43:33,615 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:43:33,615 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [592912812] [2020-07-20 17:43:33,615 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 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 [2020-07-20 17:43:33,697 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 17:43:33,698 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:43:33,699 INFO L263 TraceCheckSpWp]: Trace formula consists of 104 conjuncts, 7 conjunts are in the unsatisfiable core [2020-07-20 17:43:33,703 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:43:33,757 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 17:43:33,757 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 17:43:33,823 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 17:43:33,824 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [592912812] [2020-07-20 17:43:33,824 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 17:43:33,824 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6] total 11 [2020-07-20 17:43:33,824 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1147634261] [2020-07-20 17:43:33,825 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-07-20 17:43:33,825 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:43:33,825 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-07-20 17:43:33,826 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=75, Unknown=0, NotChecked=0, Total=110 [2020-07-20 17:43:33,826 INFO L87 Difference]: Start difference. First operand 64 states and 80 transitions. Second operand 11 states. [2020-07-20 17:43:34,190 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:43:34,190 INFO L93 Difference]: Finished difference Result 218 states and 289 transitions. [2020-07-20 17:43:34,191 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-07-20 17:43:34,191 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 38 [2020-07-20 17:43:34,191 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:43:34,193 INFO L225 Difference]: With dead ends: 218 [2020-07-20 17:43:34,193 INFO L226 Difference]: Without dead ends: 121 [2020-07-20 17:43:34,194 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 84 GetRequests, 66 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 53 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=121, Invalid=259, Unknown=0, NotChecked=0, Total=380 [2020-07-20 17:43:34,195 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 121 states. [2020-07-20 17:43:34,202 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 121 to 79. [2020-07-20 17:43:34,202 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 79 states. [2020-07-20 17:43:34,204 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 95 transitions. [2020-07-20 17:43:34,204 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 95 transitions. Word has length 38 [2020-07-20 17:43:34,204 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:43:34,204 INFO L479 AbstractCegarLoop]: Abstraction has 79 states and 95 transitions. [2020-07-20 17:43:34,204 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-07-20 17:43:34,205 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 95 transitions. [2020-07-20 17:43:34,206 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2020-07-20 17:43:34,206 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:43:34,206 INFO L422 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:43:34,422 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:43:34,423 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:43:34,424 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:43:34,424 INFO L82 PathProgramCache]: Analyzing trace with hash 1146285259, now seen corresponding path program 1 times [2020-07-20 17:43:34,424 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:43:34,425 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [106931822] [2020-07-20 17:43:34,425 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 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 [2020-07-20 17:43:34,485 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 17:43:34,485 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:43:34,486 INFO L263 TraceCheckSpWp]: Trace formula consists of 127 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-20 17:43:34,488 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:43:34,500 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-07-20 17:43:34,500 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 17:43:34,501 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [106931822] [2020-07-20 17:43:34,501 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 17:43:34,501 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 17:43:34,501 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [285689959] [2020-07-20 17:43:34,502 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 17:43:34,502 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:43:34,502 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 17:43:34,502 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 17:43:34,503 INFO L87 Difference]: Start difference. First operand 79 states and 95 transitions. Second operand 3 states. [2020-07-20 17:43:34,515 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:43:34,516 INFO L93 Difference]: Finished difference Result 142 states and 173 transitions. [2020-07-20 17:43:34,516 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 17:43:34,516 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 38 [2020-07-20 17:43:34,517 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:43:34,518 INFO L225 Difference]: With dead ends: 142 [2020-07-20 17:43:34,518 INFO L226 Difference]: Without dead ends: 80 [2020-07-20 17:43:34,519 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 36 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 17:43:34,519 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 80 states. [2020-07-20 17:43:34,524 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 80 to 80. [2020-07-20 17:43:34,525 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 80 states. [2020-07-20 17:43:34,526 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 94 transitions. [2020-07-20 17:43:34,526 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 94 transitions. Word has length 38 [2020-07-20 17:43:34,526 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:43:34,526 INFO L479 AbstractCegarLoop]: Abstraction has 80 states and 94 transitions. [2020-07-20 17:43:34,526 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 17:43:34,527 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 94 transitions. [2020-07-20 17:43:34,527 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2020-07-20 17:43:34,527 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:43:34,528 INFO L422 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:43:34,740 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:43:34,741 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:43:34,742 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:43:34,742 INFO L82 PathProgramCache]: Analyzing trace with hash 1568987085, now seen corresponding path program 1 times [2020-07-20 17:43:34,743 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:43:34,743 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1447644850] [2020-07-20 17:43:34,743 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 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 [2020-07-20 17:43:34,816 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:43:34,817 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:43:34,818 INFO L263 TraceCheckSpWp]: Trace formula consists of 139 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-20 17:43:34,820 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:43:34,888 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 17:43:34,890 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 17:43:34,906 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 17:43:34,906 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 17:43:34,927 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:43:34,982 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 17:43:34,983 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1447644850] [2020-07-20 17:43:34,983 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 17:43:34,983 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 12 [2020-07-20 17:43:34,983 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1105486448] [2020-07-20 17:43:34,984 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-20 17:43:34,984 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:43:34,984 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-20 17:43:34,984 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=98, Unknown=0, NotChecked=0, Total=132 [2020-07-20 17:43:34,984 INFO L87 Difference]: Start difference. First operand 80 states and 94 transitions. Second operand 12 states. [2020-07-20 17:43:35,303 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:43:35,303 INFO L93 Difference]: Finished difference Result 129 states and 155 transitions. [2020-07-20 17:43:35,303 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-20 17:43:35,304 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 38 [2020-07-20 17:43:35,304 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:43:35,305 INFO L225 Difference]: With dead ends: 129 [2020-07-20 17:43:35,305 INFO L226 Difference]: Without dead ends: 127 [2020-07-20 17:43:35,307 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 80 GetRequests, 63 SyntacticMatches, 2 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 33 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=72, Invalid=200, Unknown=0, NotChecked=0, Total=272 [2020-07-20 17:43:35,308 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 127 states. [2020-07-20 17:43:35,320 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 127 to 98. [2020-07-20 17:43:35,321 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 98 states. [2020-07-20 17:43:35,326 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 98 states to 98 states and 118 transitions. [2020-07-20 17:43:35,327 INFO L78 Accepts]: Start accepts. Automaton has 98 states and 118 transitions. Word has length 38 [2020-07-20 17:43:35,327 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:43:35,327 INFO L479 AbstractCegarLoop]: Abstraction has 98 states and 118 transitions. [2020-07-20 17:43:35,331 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-20 17:43:35,332 INFO L276 IsEmpty]: Start isEmpty. Operand 98 states and 118 transitions. [2020-07-20 17:43:35,333 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2020-07-20 17:43:35,334 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:43:35,334 INFO L422 BasicCegarLoop]: trace histogram [3, 2, 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] [2020-07-20 17:43:35,550 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:43:35,551 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:43:35,552 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:43:35,552 INFO L82 PathProgramCache]: Analyzing trace with hash -1672524348, now seen corresponding path program 1 times [2020-07-20 17:43:35,552 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:43:35,553 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1957428829] [2020-07-20 17:43:35,553 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 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 [2020-07-20 17:43:35,644 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 17:43:35,644 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:43:35,646 INFO L263 TraceCheckSpWp]: Trace formula consists of 146 conjuncts, 9 conjunts are in the unsatisfiable core [2020-07-20 17:43:35,655 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:43:35,740 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 17:43:35,741 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 17:43:35,828 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 17:43:35,829 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1957428829] [2020-07-20 17:43:35,829 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 17:43:35,829 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8] total 15 [2020-07-20 17:43:35,830 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1915677954] [2020-07-20 17:43:35,830 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-20 17:43:35,830 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:43:35,831 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-20 17:43:35,831 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=153, Unknown=0, NotChecked=0, Total=210 [2020-07-20 17:43:35,831 INFO L87 Difference]: Start difference. First operand 98 states and 118 transitions. Second operand 15 states. [2020-07-20 17:43:36,745 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:43:36,745 INFO L93 Difference]: Finished difference Result 419 states and 563 transitions. [2020-07-20 17:43:36,746 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2020-07-20 17:43:36,746 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 43 [2020-07-20 17:43:36,747 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:43:36,752 INFO L225 Difference]: With dead ends: 419 [2020-07-20 17:43:36,754 INFO L226 Difference]: Without dead ends: 221 [2020-07-20 17:43:36,761 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 103 GetRequests, 72 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 208 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=300, Invalid=756, Unknown=0, NotChecked=0, Total=1056 [2020-07-20 17:43:36,762 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 221 states. [2020-07-20 17:43:36,780 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 221 to 121. [2020-07-20 17:43:36,780 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 121 states. [2020-07-20 17:43:36,781 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 121 states to 121 states and 145 transitions. [2020-07-20 17:43:36,781 INFO L78 Accepts]: Start accepts. Automaton has 121 states and 145 transitions. Word has length 43 [2020-07-20 17:43:36,782 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:43:36,782 INFO L479 AbstractCegarLoop]: Abstraction has 121 states and 145 transitions. [2020-07-20 17:43:36,782 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-20 17:43:36,782 INFO L276 IsEmpty]: Start isEmpty. Operand 121 states and 145 transitions. [2020-07-20 17:43:36,783 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2020-07-20 17:43:36,783 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:43:36,783 INFO L422 BasicCegarLoop]: trace histogram [3, 2, 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] [2020-07-20 17:43:36,987 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:43:36,988 INFO L427 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:43:36,988 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:43:36,988 INFO L82 PathProgramCache]: Analyzing trace with hash -971459770, now seen corresponding path program 1 times [2020-07-20 17:43:36,989 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:43:36,989 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2089462506] [2020-07-20 17:43:36,990 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 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 [2020-07-20 17:43:37,057 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:43:37,057 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:43:37,058 INFO L263 TraceCheckSpWp]: Trace formula consists of 155 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-20 17:43:37,060 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:43:37,081 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 17:43:37,090 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 17:43:37,099 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2020-07-20 17:43:37,099 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 17:43:37,100 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2089462506] [2020-07-20 17:43:37,100 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 17:43:37,100 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-20 17:43:37,100 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1556526906] [2020-07-20 17:43:37,101 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-20 17:43:37,101 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:43:37,101 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-20 17:43:37,102 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-20 17:43:37,102 INFO L87 Difference]: Start difference. First operand 121 states and 145 transitions. Second operand 5 states. [2020-07-20 17:43:37,212 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:43:37,212 INFO L93 Difference]: Finished difference Result 284 states and 346 transitions. [2020-07-20 17:43:37,212 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-20 17:43:37,213 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 43 [2020-07-20 17:43:37,213 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:43:37,214 INFO L225 Difference]: With dead ends: 284 [2020-07-20 17:43:37,215 INFO L226 Difference]: Without dead ends: 192 [2020-07-20 17:43:37,215 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 39 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2020-07-20 17:43:37,216 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 192 states. [2020-07-20 17:43:37,224 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 192 to 124. [2020-07-20 17:43:37,224 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 124 states. [2020-07-20 17:43:37,225 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 124 states to 124 states and 148 transitions. [2020-07-20 17:43:37,225 INFO L78 Accepts]: Start accepts. Automaton has 124 states and 148 transitions. Word has length 43 [2020-07-20 17:43:37,225 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:43:37,226 INFO L479 AbstractCegarLoop]: Abstraction has 124 states and 148 transitions. [2020-07-20 17:43:37,226 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-20 17:43:37,226 INFO L276 IsEmpty]: Start isEmpty. Operand 124 states and 148 transitions. [2020-07-20 17:43:37,227 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2020-07-20 17:43:37,227 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:43:37,227 INFO L422 BasicCegarLoop]: trace histogram [3, 2, 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] [2020-07-20 17:43:37,441 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:43:37,442 INFO L427 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:43:37,443 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:43:37,443 INFO L82 PathProgramCache]: Analyzing trace with hash -713294332, now seen corresponding path program 1 times [2020-07-20 17:43:37,443 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:43:37,444 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1434037931] [2020-07-20 17:43:37,444 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 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 [2020-07-20 17:43:37,502 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:43:37,502 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:43:37,503 INFO L263 TraceCheckSpWp]: Trace formula consists of 152 conjuncts, 5 conjunts are in the unsatisfiable core [2020-07-20 17:43:37,504 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:43:37,530 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 17:43:37,544 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2020-07-20 17:43:37,545 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 17:43:37,545 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1434037931] [2020-07-20 17:43:37,545 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 17:43:37,545 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2020-07-20 17:43:37,546 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [249136277] [2020-07-20 17:43:37,546 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-07-20 17:43:37,546 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:43:37,546 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-07-20 17:43:37,546 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=16, Unknown=0, NotChecked=0, Total=30 [2020-07-20 17:43:37,547 INFO L87 Difference]: Start difference. First operand 124 states and 148 transitions. Second operand 6 states. [2020-07-20 17:43:37,698 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:43:37,699 INFO L93 Difference]: Finished difference Result 311 states and 386 transitions. [2020-07-20 17:43:37,699 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-20 17:43:37,699 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 43 [2020-07-20 17:43:37,700 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:43:37,702 INFO L225 Difference]: With dead ends: 311 [2020-07-20 17:43:37,702 INFO L226 Difference]: Without dead ends: 208 [2020-07-20 17:43:37,703 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 38 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=20, Invalid=22, Unknown=0, NotChecked=0, Total=42 [2020-07-20 17:43:37,704 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 208 states. [2020-07-20 17:43:37,713 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 208 to 165. [2020-07-20 17:43:37,713 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 165 states. [2020-07-20 17:43:37,715 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 165 states to 165 states and 202 transitions. [2020-07-20 17:43:37,715 INFO L78 Accepts]: Start accepts. Automaton has 165 states and 202 transitions. Word has length 43 [2020-07-20 17:43:37,716 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:43:37,716 INFO L479 AbstractCegarLoop]: Abstraction has 165 states and 202 transitions. [2020-07-20 17:43:37,716 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-07-20 17:43:37,716 INFO L276 IsEmpty]: Start isEmpty. Operand 165 states and 202 transitions. [2020-07-20 17:43:37,718 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2020-07-20 17:43:37,719 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:43:37,719 INFO L422 BasicCegarLoop]: trace histogram [3, 2, 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] [2020-07-20 17:43:37,932 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:43:37,933 INFO L427 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:43:37,933 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:43:37,933 INFO L82 PathProgramCache]: Analyzing trace with hash 1587528258, now seen corresponding path program 2 times [2020-07-20 17:43:37,933 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:43:37,934 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [382639086] [2020-07-20 17:43:37,934 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 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 [2020-07-20 17:43:37,996 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:43:37,997 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:43:37,998 INFO L263 TraceCheckSpWp]: Trace formula consists of 149 conjuncts, 7 conjunts are in the unsatisfiable core [2020-07-20 17:43:38,000 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:43:38,032 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 17:43:38,047 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 9 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 17:43:38,047 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 17:43:38,047 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [382639086] [2020-07-20 17:43:38,048 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 17:43:38,048 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2020-07-20 17:43:38,048 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [891540213] [2020-07-20 17:43:38,048 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-07-20 17:43:38,049 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:43:38,049 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-07-20 17:43:38,049 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=37, Unknown=0, NotChecked=0, Total=56 [2020-07-20 17:43:38,049 INFO L87 Difference]: Start difference. First operand 165 states and 202 transitions. Second operand 8 states. [2020-07-20 17:43:38,192 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:43:38,192 INFO L93 Difference]: Finished difference Result 339 states and 417 transitions. [2020-07-20 17:43:38,192 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-20 17:43:38,193 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 43 [2020-07-20 17:43:38,193 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:43:38,195 INFO L225 Difference]: With dead ends: 339 [2020-07-20 17:43:38,196 INFO L226 Difference]: Without dead ends: 241 [2020-07-20 17:43:38,197 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 36 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=51, Invalid=81, Unknown=0, NotChecked=0, Total=132 [2020-07-20 17:43:38,197 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 241 states. [2020-07-20 17:43:38,207 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 241 to 153. [2020-07-20 17:43:38,207 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 153 states. [2020-07-20 17:43:38,208 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 153 states to 153 states and 185 transitions. [2020-07-20 17:43:38,209 INFO L78 Accepts]: Start accepts. Automaton has 153 states and 185 transitions. Word has length 43 [2020-07-20 17:43:38,209 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:43:38,209 INFO L479 AbstractCegarLoop]: Abstraction has 153 states and 185 transitions. [2020-07-20 17:43:38,209 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-07-20 17:43:38,209 INFO L276 IsEmpty]: Start isEmpty. Operand 153 states and 185 transitions. [2020-07-20 17:43:38,210 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2020-07-20 17:43:38,210 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:43:38,211 INFO L422 BasicCegarLoop]: trace histogram [3, 2, 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] [2020-07-20 17:43:38,424 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:43:38,425 INFO L427 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:43:38,425 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:43:38,425 INFO L82 PathProgramCache]: Analyzing trace with hash -1045907359, now seen corresponding path program 1 times [2020-07-20 17:43:38,425 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:43:38,425 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [157300984] [2020-07-20 17:43:38,426 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 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 [2020-07-20 17:43:38,486 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:43:38,487 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:43:38,488 INFO L263 TraceCheckSpWp]: Trace formula consists of 160 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 17:43:38,489 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:43:38,494 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 17:43:38,501 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2020-07-20 17:43:38,501 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 17:43:38,502 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [157300984] [2020-07-20 17:43:38,502 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 17:43:38,502 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-07-20 17:43:38,502 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [447485047] [2020-07-20 17:43:38,503 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-07-20 17:43:38,503 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:43:38,503 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-07-20 17:43:38,503 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-07-20 17:43:38,503 INFO L87 Difference]: Start difference. First operand 153 states and 185 transitions. Second operand 4 states. [2020-07-20 17:43:38,524 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:43:38,525 INFO L93 Difference]: Finished difference Result 262 states and 315 transitions. [2020-07-20 17:43:38,526 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-07-20 17:43:38,527 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 45 [2020-07-20 17:43:38,527 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:43:38,529 INFO L225 Difference]: With dead ends: 262 [2020-07-20 17:43:38,529 INFO L226 Difference]: Without dead ends: 157 [2020-07-20 17:43:38,530 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 42 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-07-20 17:43:38,530 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 157 states. [2020-07-20 17:43:38,538 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 157 to 157. [2020-07-20 17:43:38,538 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 157 states. [2020-07-20 17:43:38,539 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 157 states to 157 states and 186 transitions. [2020-07-20 17:43:38,540 INFO L78 Accepts]: Start accepts. Automaton has 157 states and 186 transitions. Word has length 45 [2020-07-20 17:43:38,540 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:43:38,540 INFO L479 AbstractCegarLoop]: Abstraction has 157 states and 186 transitions. [2020-07-20 17:43:38,540 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-07-20 17:43:38,540 INFO L276 IsEmpty]: Start isEmpty. Operand 157 states and 186 transitions. [2020-07-20 17:43:38,541 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2020-07-20 17:43:38,541 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:43:38,541 INFO L422 BasicCegarLoop]: trace histogram [3, 2, 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] [2020-07-20 17:43:38,756 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:43:38,757 INFO L427 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:43:38,757 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:43:38,758 INFO L82 PathProgramCache]: Analyzing trace with hash -2066975713, now seen corresponding path program 1 times [2020-07-20 17:43:38,758 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:43:38,758 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1507744982] [2020-07-20 17:43:38,759 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 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 [2020-07-20 17:43:38,837 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:43:38,837 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:43:38,839 INFO L263 TraceCheckSpWp]: Trace formula consists of 163 conjuncts, 19 conjunts are in the unsatisfiable core [2020-07-20 17:43:38,840 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:43:38,917 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 17:43:38,919 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 17:43:38,959 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 17:43:38,960 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 17:43:38,989 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:43:39,086 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 17:43:39,087 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1507744982] [2020-07-20 17:43:39,087 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 17:43:39,087 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 9] total 17 [2020-07-20 17:43:39,088 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1801721493] [2020-07-20 17:43:39,089 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-20 17:43:39,089 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:43:39,090 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-20 17:43:39,090 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=54, Invalid=218, Unknown=0, NotChecked=0, Total=272 [2020-07-20 17:43:39,090 INFO L87 Difference]: Start difference. First operand 157 states and 186 transitions. Second operand 17 states. [2020-07-20 17:43:39,820 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:43:39,820 INFO L93 Difference]: Finished difference Result 267 states and 319 transitions. [2020-07-20 17:43:39,820 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-07-20 17:43:39,821 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 45 [2020-07-20 17:43:39,821 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:43:39,824 INFO L225 Difference]: With dead ends: 267 [2020-07-20 17:43:39,824 INFO L226 Difference]: Without dead ends: 265 [2020-07-20 17:43:39,825 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 105 GetRequests, 72 SyntacticMatches, 2 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 173 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=220, Invalid=836, Unknown=0, NotChecked=0, Total=1056 [2020-07-20 17:43:39,826 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 265 states. [2020-07-20 17:43:39,834 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 265 to 144. [2020-07-20 17:43:39,834 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 144 states. [2020-07-20 17:43:39,835 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 144 states to 144 states and 172 transitions. [2020-07-20 17:43:39,836 INFO L78 Accepts]: Start accepts. Automaton has 144 states and 172 transitions. Word has length 45 [2020-07-20 17:43:39,836 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:43:39,836 INFO L479 AbstractCegarLoop]: Abstraction has 144 states and 172 transitions. [2020-07-20 17:43:39,836 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-20 17:43:39,836 INFO L276 IsEmpty]: Start isEmpty. Operand 144 states and 172 transitions. [2020-07-20 17:43:39,837 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2020-07-20 17:43:39,837 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:43:39,837 INFO L422 BasicCegarLoop]: trace histogram [3, 2, 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] [2020-07-20 17:43:40,047 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:43:40,048 INFO L427 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:43:40,049 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:43:40,049 INFO L82 PathProgramCache]: Analyzing trace with hash 709278555, now seen corresponding path program 1 times [2020-07-20 17:43:40,049 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:43:40,050 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1176247723] [2020-07-20 17:43:40,050 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 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 [2020-07-20 17:43:40,137 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:43:40,138 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:43:40,139 INFO L263 TraceCheckSpWp]: Trace formula consists of 162 conjuncts, 19 conjunts are in the unsatisfiable core [2020-07-20 17:43:40,141 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:43:40,221 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 17:43:40,222 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 17:43:40,259 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 17:43:40,260 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 17:43:40,294 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:43:40,412 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 17:43:40,413 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1176247723] [2020-07-20 17:43:40,413 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 17:43:40,413 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 10] total 18 [2020-07-20 17:43:40,413 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2021701507] [2020-07-20 17:43:40,414 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-07-20 17:43:40,414 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:43:40,415 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-07-20 17:43:40,415 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=249, Unknown=0, NotChecked=0, Total=306 [2020-07-20 17:43:40,415 INFO L87 Difference]: Start difference. First operand 144 states and 172 transitions. Second operand 18 states. [2020-07-20 17:43:41,265 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:43:41,266 INFO L93 Difference]: Finished difference Result 313 states and 383 transitions. [2020-07-20 17:43:41,266 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2020-07-20 17:43:41,266 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 45 [2020-07-20 17:43:41,267 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:43:41,270 INFO L225 Difference]: With dead ends: 313 [2020-07-20 17:43:41,271 INFO L226 Difference]: Without dead ends: 311 [2020-07-20 17:43:41,272 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 109 GetRequests, 71 SyntacticMatches, 2 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 271 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=339, Invalid=1067, Unknown=0, NotChecked=0, Total=1406 [2020-07-20 17:43:41,272 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 311 states. [2020-07-20 17:43:41,288 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 311 to 163. [2020-07-20 17:43:41,288 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 163 states. [2020-07-20 17:43:41,290 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 163 states to 163 states and 200 transitions. [2020-07-20 17:43:41,291 INFO L78 Accepts]: Start accepts. Automaton has 163 states and 200 transitions. Word has length 45 [2020-07-20 17:43:41,291 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:43:41,291 INFO L479 AbstractCegarLoop]: Abstraction has 163 states and 200 transitions. [2020-07-20 17:43:41,291 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-07-20 17:43:41,291 INFO L276 IsEmpty]: Start isEmpty. Operand 163 states and 200 transitions. [2020-07-20 17:43:41,292 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2020-07-20 17:43:41,292 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:43:41,292 INFO L422 BasicCegarLoop]: trace histogram [3, 2, 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] [2020-07-20 17:43:41,505 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:43:41,506 INFO L427 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:43:41,506 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:43:41,507 INFO L82 PathProgramCache]: Analyzing trace with hash 1410343133, now seen corresponding path program 1 times [2020-07-20 17:43:41,507 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:43:41,508 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1730099114] [2020-07-20 17:43:41,508 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 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 [2020-07-20 17:43:41,568 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:43:41,568 INFO L229 tOrderPrioritization]: Conjunction of SSA is sat [2020-07-20 17:43:41,568 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-07-20 17:43:41,586 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-07-20 17:43:41,586 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-07-20 17:43:41,618 INFO L174 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2020-07-20 17:43:41,619 INFO L520 BasicCegarLoop]: Counterexample might be feasible [2020-07-20 17:43:41,833 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:43:41,881 WARN L1295 BoogieBacktranslator]: Unfinished Backtranslation: Expression #t~switch4 has a C AST node but it is no IASTExpression: class org.eclipse.cdt.internal.core.dom.parser.c.CASTSwitchStatement [2020-07-20 17:43:41,883 WARN L1295 BoogieBacktranslator]: Unfinished Backtranslation: Expression #t~switch4 has a C AST node but it is no IASTExpression: class org.eclipse.cdt.internal.core.dom.parser.c.CASTSwitchStatement [2020-07-20 17:43:41,884 WARN L1295 BoogieBacktranslator]: Unfinished Backtranslation: Expression #t~switch4 has a C AST node but it is no IASTExpression: class org.eclipse.cdt.internal.core.dom.parser.c.CASTSwitchStatement [2020-07-20 17:43:41,885 WARN L1295 BoogieBacktranslator]: Unfinished Backtranslation: Expression #t~switch4 has a C AST node but it is no IASTExpression: class org.eclipse.cdt.internal.core.dom.parser.c.CASTSwitchStatement [2020-07-20 17:43:41,885 WARN L1295 BoogieBacktranslator]: Unfinished Backtranslation: Expression #t~switch4 has a C AST node but it is no IASTExpression: class org.eclipse.cdt.internal.core.dom.parser.c.CASTSwitchStatement [2020-07-20 17:43:41,886 WARN L1295 BoogieBacktranslator]: Unfinished Backtranslation: Expression #t~switch4 has a C AST node but it is no IASTExpression: class org.eclipse.cdt.internal.core.dom.parser.c.CASTSwitchStatement [2020-07-20 17:43:41,886 WARN L1295 BoogieBacktranslator]: Unfinished Backtranslation: Expression #t~switch4 has a C AST node but it is no IASTExpression: class org.eclipse.cdt.internal.core.dom.parser.c.CASTSwitchStatement [2020-07-20 17:43:41,887 WARN L1295 BoogieBacktranslator]: Unfinished Backtranslation: Expression #t~switch4 has a C AST node but it is no IASTExpression: class org.eclipse.cdt.internal.core.dom.parser.c.CASTSwitchStatement [2020-07-20 17:43:41,887 WARN L1295 BoogieBacktranslator]: Unfinished Backtranslation: Expression #t~switch4 has a C AST node but it is no IASTExpression: class org.eclipse.cdt.internal.core.dom.parser.c.CASTSwitchStatement [2020-07-20 17:43:41,888 WARN L1295 BoogieBacktranslator]: Unfinished Backtranslation: Expression #t~switch4 has a C AST node but it is no IASTExpression: class org.eclipse.cdt.internal.core.dom.parser.c.CASTSwitchStatement [2020-07-20 17:43:41,888 WARN L1295 BoogieBacktranslator]: Unfinished Backtranslation: Expression #t~switch4 has a C AST node but it is no IASTExpression: class org.eclipse.cdt.internal.core.dom.parser.c.CASTSwitchStatement [2020-07-20 17:43:41,904 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 20.07 05:43:41 BoogieIcfgContainer [2020-07-20 17:43:41,905 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-07-20 17:43:41,910 INFO L168 Benchmark]: Toolchain (without parser) took 12308.25 ms. Allocated memory was 138.4 MB in the beginning and 302.5 MB in the end (delta: 164.1 MB). Free memory was 102.9 MB in the beginning and 234.7 MB in the end (delta: -131.7 MB). Peak memory consumption was 32.4 MB. Max. memory is 7.1 GB. [2020-07-20 17:43:41,911 INFO L168 Benchmark]: CDTParser took 0.55 ms. Allocated memory is still 138.4 MB. Free memory was 121.5 MB in the beginning and 121.3 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. [2020-07-20 17:43:41,912 INFO L168 Benchmark]: CACSL2BoogieTranslator took 502.42 ms. Allocated memory was 138.4 MB in the beginning and 206.6 MB in the end (delta: 68.2 MB). Free memory was 102.5 MB in the beginning and 182.7 MB in the end (delta: -80.2 MB). Peak memory consumption was 22.6 MB. Max. memory is 7.1 GB. [2020-07-20 17:43:41,913 INFO L168 Benchmark]: Boogie Preprocessor took 73.50 ms. Allocated memory is still 206.6 MB. Free memory was 182.7 MB in the beginning and 180.5 MB in the end (delta: 2.2 MB). Peak memory consumption was 2.2 MB. Max. memory is 7.1 GB. [2020-07-20 17:43:41,916 INFO L168 Benchmark]: RCFGBuilder took 609.78 ms. Allocated memory is still 206.6 MB. Free memory was 180.5 MB in the beginning and 153.3 MB in the end (delta: 27.2 MB). Peak memory consumption was 27.2 MB. Max. memory is 7.1 GB. [2020-07-20 17:43:41,917 INFO L168 Benchmark]: TraceAbstraction took 11116.85 ms. Allocated memory was 206.6 MB in the beginning and 302.5 MB in the end (delta: 95.9 MB). Free memory was 152.6 MB in the beginning and 238.1 MB in the end (delta: -85.4 MB). Peak memory consumption was 10.5 MB. Max. memory is 7.1 GB. [2020-07-20 17:43:41,922 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.55 ms. Allocated memory is still 138.4 MB. Free memory was 121.5 MB in the beginning and 121.3 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 502.42 ms. Allocated memory was 138.4 MB in the beginning and 206.6 MB in the end (delta: 68.2 MB). Free memory was 102.5 MB in the beginning and 182.7 MB in the end (delta: -80.2 MB). Peak memory consumption was 22.6 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 73.50 ms. Allocated memory is still 206.6 MB. Free memory was 182.7 MB in the beginning and 180.5 MB in the end (delta: 2.2 MB). Peak memory consumption was 2.2 MB. Max. memory is 7.1 GB. * RCFGBuilder took 609.78 ms. Allocated memory is still 206.6 MB. Free memory was 180.5 MB in the beginning and 153.3 MB in the end (delta: 27.2 MB). Peak memory consumption was 27.2 MB. Max. memory is 7.1 GB. * TraceAbstraction took 11116.85 ms. Allocated memory was 206.6 MB in the beginning and 302.5 MB in the end (delta: 95.9 MB). Free memory was 152.6 MB in the beginning and 238.1 MB in the end (delta: -85.4 MB). Peak memory consumption was 10.5 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: - GenericResult: Unfinished Backtranslation Unfinished Backtranslation: Expression #t~switch4 has a C AST node but it is no IASTExpression: class org.eclipse.cdt.internal.core.dom.parser.c.CASTSwitchStatement - GenericResult: Unfinished Backtranslation Unfinished Backtranslation: Expression #t~switch4 has a C AST node but it is no IASTExpression: class org.eclipse.cdt.internal.core.dom.parser.c.CASTSwitchStatement - GenericResult: Unfinished Backtranslation Unfinished Backtranslation: Expression #t~switch4 has a C AST node but it is no IASTExpression: class org.eclipse.cdt.internal.core.dom.parser.c.CASTSwitchStatement - GenericResult: Unfinished Backtranslation Unfinished Backtranslation: Expression #t~switch4 has a C AST node but it is no IASTExpression: class org.eclipse.cdt.internal.core.dom.parser.c.CASTSwitchStatement - GenericResult: Unfinished Backtranslation Unfinished Backtranslation: Expression #t~switch4 has a C AST node but it is no IASTExpression: class org.eclipse.cdt.internal.core.dom.parser.c.CASTSwitchStatement - GenericResult: Unfinished Backtranslation Unfinished Backtranslation: Expression #t~switch4 has a C AST node but it is no IASTExpression: class org.eclipse.cdt.internal.core.dom.parser.c.CASTSwitchStatement - GenericResult: Unfinished Backtranslation Unfinished Backtranslation: Expression #t~switch4 has a C AST node but it is no IASTExpression: class org.eclipse.cdt.internal.core.dom.parser.c.CASTSwitchStatement - GenericResult: Unfinished Backtranslation Unfinished Backtranslation: Expression #t~switch4 has a C AST node but it is no IASTExpression: class org.eclipse.cdt.internal.core.dom.parser.c.CASTSwitchStatement - GenericResult: Unfinished Backtranslation Unfinished Backtranslation: Expression #t~switch4 has a C AST node but it is no IASTExpression: class org.eclipse.cdt.internal.core.dom.parser.c.CASTSwitchStatement - GenericResult: Unfinished Backtranslation Unfinished Backtranslation: Expression #t~switch4 has a C AST node but it is no IASTExpression: class org.eclipse.cdt.internal.core.dom.parser.c.CASTSwitchStatement - GenericResult: Unfinished Backtranslation Unfinished Backtranslation: Expression #t~switch4 has a C AST node but it is no IASTExpression: class org.eclipse.cdt.internal.core.dom.parser.c.CASTSwitchStatement * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 4]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_error() is reachable We found a FailurePath: [L74] char A [2 + 2 + 4 +1]; [L75] A[2 + 2 + 4] = 0 VAL [A={2:0}] [L76] CALL parse_expression_list (A) VAL [str={2:0}] [L48] int start=0, i=-1, j=-1; [L49] char str2[2]; VAL [i=-1, j=-1, start=0, str={2:0}, str={2:0}, str2={3:0}] [L50] COND FALSE !(!str) VAL [i=-1, j=-1, start=0, str={2:0}, str={2:0}, str2={3:0}] [L52] i++ [L53] str[i] [L54] case 0: VAL [i=0, j=-1, start=0, str={2:0}, str={2:0}, str2={3:0}, str[i]=13] [L69] EXPR str[i] VAL [i=0, j=-1, start=0, str={2:0}, str={2:0}, str2={3:0}, str[i]=13] [L69] COND TRUE str[i] != 0 [L52] i++ [L53] str[i] [L54] case 0: VAL [i=1, j=-1, start=0, str={2:0}, str={2:0}, str2={3:0}, str[i]=14] [L69] EXPR str[i] VAL [i=1, j=-1, start=0, str={2:0}, str={2:0}, str2={3:0}, str[i]=14] [L69] COND TRUE str[i] != 0 [L52] i++ [L53] str[i] [L54] case 0: VAL [i=2, j=-1, start=0, str={2:0}, str={2:0}, str2={3:0}, str[i]=0] [L55] EXPR str[start] [L55] (str[start] == ' ') || (str[start] == '\t') [L55] EXPR str[start] [L55] (str[start] == ' ') || (str[start] == '\t') VAL [(str[start] == ' ') || (str[start] == '\t')=0, i=2, j=-1, start=0, str={2:0}, str={2:0}, str2={3:0}, str[i]=0, str[start]=13, str[start]=13] [L55] COND FALSE !((str[start] == ' ') || (str[start] == '\t')) [L56] EXPR str[start] VAL [i=2, j=-1, start=0, str={2:0}, str={2:0}, str2={3:0}, str[i]=0, str[start]=13] [L56] COND FALSE !(str[start] == '"') [L57] j = i-1 VAL [i=2, j=1, start=0, str={2:0}, str={2:0}, str2={3:0}, str[i]=0] [L58] (0 < j) && ((str[j] == ' ') || (str[j] == '\t')) [L58] EXPR str[j] [L58] EXPR (str[j] == ' ') || (str[j] == '\t') [L58] EXPR str[j] [L58] EXPR (str[j] == ' ') || (str[j] == '\t') VAL [(0 < j) && ((str[j] == ' ') || (str[j] == '\t'))=1, (str[j] == ' ') || (str[j] == '\t')=0, i=2, j=1, start=0, str={2:0}, str={2:0}, str2={3:0}, str[i]=0, str[j]=14, str[j]=14] [L58] (0 < j) && ((str[j] == ' ') || (str[j] == '\t')) VAL [(0 < j) && ((str[j] == ' ') || (str[j] == '\t'))=0, (str[j] == ' ') || (str[j] == '\t')=0, i=2, j=1, start=0, str={2:0}, str={2:0}, str2={3:0}, str[i]=0, str[j]=14, str[j]=14] [L58] COND FALSE !((0 < j) && ((str[j] == ' ') || (str[j] == '\t'))) [L59] (0 < j) && (str[j] == '"') [L59] EXPR str[j] [L59] (0 < j) && (str[j] == '"') VAL [(0 < j) && (str[j] == '"')=0, i=2, j=1, start=0, str={2:0}, str={2:0}, str2={3:0}, str[i]=0, str[j]=14] [L59] COND FALSE !((0 < j) && (str[j] == '"')) [L60] COND TRUE start<=j VAL [i=2, j=1, start=0, str={2:0}, str={2:0}, str2={3:0}, str[i]=0] [L61] CALL r_strncpy(str2, str+start, j-start+1) VAL [\old(n)=2, dest={3:0}, src={2:0}] [L30] return strncpy(dest,src,n); [L61] RET r_strncpy(str2, str+start, j-start+1) VAL [i=2, j=1, r_strncpy(str2, str+start, j-start+1)={17:18}, start=0, str={2:0}, str={2:0}, str2={3:0}, str[i]=0] [L62] CALL __VERIFIER_assert(j - start + 1 < 2) VAL [\old(cond)=0] [L3] COND TRUE !(cond) VAL [\old(cond)=0, cond=0] [L4] __VERIFIER_error() VAL [\old(cond)=0, cond=0] - StatisticsResult: Ultimate Automizer benchmark data CFG has 6 procedures, 51 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 10.9s, OverallIterations: 15, TraceHistogramMax: 3, AutomataDifference: 4.4s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 757 SDtfs, 2052 SDslu, 3174 SDs, 0 SdLazy, 2537 SolverSat, 468 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 2.1s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 873 GetRequests, 683 SyntacticMatches, 9 SemanticMatches, 181 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 769 ImplicationChecksByTransitivity, 2.2s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=165occurred in iteration=10, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.2s AutomataMinimizationTime, 14 MinimizatonAttempts, 709 StatesRemovedByMinimization, 12 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.2s SsaConstructionTime, 0.5s SatisfiabilityAnalysisTime, 1.5s InterpolantComputationTime, 599 NumberOfCodeBlocks, 502 NumberOfCodeBlocksAsserted, 48 NumberOfCheckSat, 781 ConstructedInterpolants, 0 QuantifiedInterpolants, 103691 SizeOfPredicates, 37 NumberOfNonLiveVariables, 1863 ConjunctsInSsa, 105 ConjunctsInUnsatCore, 20 InterpolantComputations, 8 PerfectInterpolantSequences, 38/104 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be incorrect! Received shutdown request...