/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample FPandBPonlyIfFpWasNotPerfect -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.assert.codeblocks SMT_FEATURE_HEURISTIC --traceabstraction.assert.codeblocks.term.scoring.heuristic NUM_VARIABLES --traceabstraction.assert.codeblocks.term.scoring.heuristic.partitioning.strategy FIXED_NUM_PARTITIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.number.of.partitions 2 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/array-fpi/s4iff.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-21 16:42:54,344 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-21 16:42:54,347 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-21 16:42:54,359 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-21 16:42:54,359 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-21 16:42:54,360 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-21 16:42:54,361 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-21 16:42:54,363 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-21 16:42:54,365 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-21 16:42:54,366 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-21 16:42:54,367 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-21 16:42:54,368 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-21 16:42:54,368 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-21 16:42:54,369 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-21 16:42:54,370 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-21 16:42:54,371 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-21 16:42:54,372 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-21 16:42:54,373 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-21 16:42:54,374 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-21 16:42:54,376 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-21 16:42:54,377 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-21 16:42:54,379 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-21 16:42:54,380 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-21 16:42:54,380 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-21 16:42:54,383 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-07-21 16:42:54,383 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-07-21 16:42:54,383 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-07-21 16:42:54,384 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-07-21 16:42:54,384 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-07-21 16:42:54,385 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-07-21 16:42:54,386 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-07-21 16:42:54,386 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-07-21 16:42:54,387 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-07-21 16:42:54,388 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-07-21 16:42:54,389 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-07-21 16:42:54,389 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-07-21 16:42:54,390 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-07-21 16:42:54,390 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-07-21 16:42:54,390 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-21 16:42:54,391 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-21 16:42:54,392 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-21 16:42:54,392 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-07-21 16:42:54,408 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-21 16:42:54,408 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-21 16:42:54,409 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-21 16:42:54,410 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-21 16:42:54,410 INFO L138 SettingsManager]: * Use SBE=true [2020-07-21 16:42:54,410 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-21 16:42:54,410 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-21 16:42:54,410 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-21 16:42:54,412 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-21 16:42:54,413 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-21 16:42:54,413 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-21 16:42:54,413 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-21 16:42:54,413 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-21 16:42:54,413 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-21 16:42:54,414 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-21 16:42:54,414 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-21 16:42:54,414 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-21 16:42:54,414 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-21 16:42:54,414 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-21 16:42:54,414 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-21 16:42:54,415 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-21 16:42:54,415 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 16:42:54,415 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-21 16:42:54,416 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-21 16:42:54,417 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-21 16:42:54,417 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-21 16:42:54,417 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:42:54,417 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-21 16:42:54,417 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-21 16:42:54,418 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> FPandBPonlyIfFpWasNotPerfect Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks -> SMT_FEATURE_HEURISTIC Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic -> NUM_VARIABLES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic Partitioning Strategy -> FIXED_NUM_PARTITIONS Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic number of partitions -> 2 [2020-07-21 16:42:54,718 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-21 16:42:54,733 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-21 16:42:54,737 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-21 16:42:54,738 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-21 16:42:54,739 INFO L275 PluginConnector]: CDTParser initialized [2020-07-21 16:42:54,739 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/array-fpi/s4iff.c [2020-07-21 16:42:54,812 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/7b9bb6c34/394a1add752f4a5fada32434fca451a8/FLAGb25fbea24 [2020-07-21 16:42:55,313 INFO L306 CDTParser]: Found 1 translation units. [2020-07-21 16:42:55,313 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/array-fpi/s4iff.c [2020-07-21 16:42:55,320 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/7b9bb6c34/394a1add752f4a5fada32434fca451a8/FLAGb25fbea24 [2020-07-21 16:42:55,709 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/7b9bb6c34/394a1add752f4a5fada32434fca451a8 [2020-07-21 16:42:55,718 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-21 16:42:55,721 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-21 16:42:55,722 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-21 16:42:55,722 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-21 16:42:55,727 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-21 16:42:55,728 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 04:42:55" (1/1) ... [2020-07-21 16:42:55,731 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@b0daa1 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:42:55, skipping insertion in model container [2020-07-21 16:42:55,731 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 04:42:55" (1/1) ... [2020-07-21 16:42:55,740 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-21 16:42:55,762 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-21 16:42:55,964 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 16:42:55,973 INFO L203 MainTranslator]: Completed pre-run [2020-07-21 16:42:55,994 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 16:42:56,011 INFO L208 MainTranslator]: Completed translation [2020-07-21 16:42:56,011 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:42:56 WrapperNode [2020-07-21 16:42:56,012 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-21 16:42:56,012 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-21 16:42:56,013 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-21 16:42:56,013 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-21 16:42:56,109 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:42:56" (1/1) ... [2020-07-21 16:42:56,109 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:42:56" (1/1) ... [2020-07-21 16:42:56,120 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:42:56" (1/1) ... [2020-07-21 16:42:56,120 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:42:56" (1/1) ... [2020-07-21 16:42:56,128 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:42:56" (1/1) ... [2020-07-21 16:42:56,136 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:42:56" (1/1) ... [2020-07-21 16:42:56,138 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:42:56" (1/1) ... [2020-07-21 16:42:56,140 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-21 16:42:56,141 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-21 16:42:56,141 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-21 16:42:56,141 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-21 16:42:56,142 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:42:56" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 16:42:56,205 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-21 16:42:56,206 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-21 16:42:56,206 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2020-07-21 16:42:56,206 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-07-21 16:42:56,206 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-21 16:42:56,206 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-21 16:42:56,206 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-07-21 16:42:56,207 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2020-07-21 16:42:56,207 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-07-21 16:42:56,207 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-21 16:42:56,208 INFO L130 BoogieDeclarations]: Found specification of procedure malloc [2020-07-21 16:42:56,208 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-21 16:42:56,208 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-07-21 16:42:56,208 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2020-07-21 16:42:56,208 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-07-21 16:42:56,208 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-07-21 16:42:56,209 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-07-21 16:42:56,209 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-21 16:42:56,209 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-21 16:42:56,556 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-21 16:42:56,556 INFO L295 CfgBuilder]: Removed 2 assume(true) statements. [2020-07-21 16:42:56,560 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 04:42:56 BoogieIcfgContainer [2020-07-21 16:42:56,560 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-21 16:42:56,562 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-21 16:42:56,562 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-21 16:42:56,564 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-21 16:42:56,564 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.07 04:42:55" (1/3) ... [2020-07-21 16:42:56,565 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4687860e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 04:42:56, skipping insertion in model container [2020-07-21 16:42:56,565 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:42:56" (2/3) ... [2020-07-21 16:42:56,566 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4687860e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 04:42:56, skipping insertion in model container [2020-07-21 16:42:56,566 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 04:42:56" (3/3) ... [2020-07-21 16:42:56,567 INFO L109 eAbstractionObserver]: Analyzing ICFG s4iff.c [2020-07-21 16:42:56,575 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-21 16:42:56,580 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-21 16:42:56,593 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-21 16:42:56,613 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-21 16:42:56,614 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-21 16:42:56,614 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-21 16:42:56,614 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-21 16:42:56,614 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-21 16:42:56,614 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-21 16:42:56,614 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-21 16:42:56,614 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-21 16:42:56,630 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states. [2020-07-21 16:42:56,635 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-07-21 16:42:56,636 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:42:56,637 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] [2020-07-21 16:42:56,637 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:42:56,642 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:42:56,642 INFO L82 PathProgramCache]: Analyzing trace with hash -432131487, now seen corresponding path program 1 times [2020-07-21 16:42:56,649 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:42:56,649 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [444312158] [2020-07-21 16:42:56,649 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:42:56,752 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:42:56,753 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:42:56,755 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 1 conjunts are in the unsatisfiable core [2020-07-21 16:42:56,761 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:42:56,782 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 16:42:56,782 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 16:42:56,784 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [444312158] [2020-07-21 16:42:56,784 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 16:42:56,785 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2020-07-21 16:42:56,786 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1806552681] [2020-07-21 16:42:56,790 INFO L459 AbstractCegarLoop]: Interpolant automaton has 2 states [2020-07-21 16:42:56,790 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:42:56,800 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2020-07-21 16:42:56,801 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-07-21 16:42:56,803 INFO L87 Difference]: Start difference. First operand 32 states. Second operand 2 states. [2020-07-21 16:42:56,823 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:42:56,824 INFO L93 Difference]: Finished difference Result 54 states and 67 transitions. [2020-07-21 16:42:56,824 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2020-07-21 16:42:56,825 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 21 [2020-07-21 16:42:56,826 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:42:56,833 INFO L225 Difference]: With dead ends: 54 [2020-07-21 16:42:56,833 INFO L226 Difference]: Without dead ends: 25 [2020-07-21 16:42:56,837 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-07-21 16:42:56,853 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2020-07-21 16:42:56,871 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2020-07-21 16:42:56,873 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2020-07-21 16:42:56,874 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 27 transitions. [2020-07-21 16:42:56,876 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 27 transitions. Word has length 21 [2020-07-21 16:42:56,876 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:42:56,876 INFO L479 AbstractCegarLoop]: Abstraction has 25 states and 27 transitions. [2020-07-21 16:42:56,877 INFO L480 AbstractCegarLoop]: Interpolant automaton has 2 states. [2020-07-21 16:42:56,877 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 27 transitions. [2020-07-21 16:42:56,878 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-07-21 16:42:56,878 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:42:56,878 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] [2020-07-21 16:42:57,091 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:42:57,091 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:42:57,092 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:42:57,093 INFO L82 PathProgramCache]: Analyzing trace with hash -173966049, now seen corresponding path program 1 times [2020-07-21 16:42:57,093 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:42:57,094 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [742183551] [2020-07-21 16:42:57,095 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:42:57,178 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:42:57,179 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:42:57,180 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 16:42:57,182 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:42:57,223 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 16:42:57,223 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 16:42:57,224 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [742183551] [2020-07-21 16:42:57,224 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 16:42:57,224 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-07-21 16:42:57,225 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1254496179] [2020-07-21 16:42:57,226 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-07-21 16:42:57,227 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:42:57,227 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-07-21 16:42:57,227 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2020-07-21 16:42:57,228 INFO L87 Difference]: Start difference. First operand 25 states and 27 transitions. Second operand 4 states. [2020-07-21 16:42:57,303 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:42:57,303 INFO L93 Difference]: Finished difference Result 40 states and 46 transitions. [2020-07-21 16:42:57,304 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-07-21 16:42:57,304 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 21 [2020-07-21 16:42:57,305 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:42:57,306 INFO L225 Difference]: With dead ends: 40 [2020-07-21 16:42:57,306 INFO L226 Difference]: Without dead ends: 30 [2020-07-21 16:42:57,307 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 18 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2020-07-21 16:42:57,307 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-07-21 16:42:57,313 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 27. [2020-07-21 16:42:57,313 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2020-07-21 16:42:57,314 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 29 transitions. [2020-07-21 16:42:57,314 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 29 transitions. Word has length 21 [2020-07-21 16:42:57,315 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:42:57,315 INFO L479 AbstractCegarLoop]: Abstraction has 27 states and 29 transitions. [2020-07-21 16:42:57,315 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-07-21 16:42:57,315 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 29 transitions. [2020-07-21 16:42:57,316 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-07-21 16:42:57,316 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:42:57,316 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] [2020-07-21 16:42:57,530 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:42:57,531 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:42:57,532 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:42:57,532 INFO L82 PathProgramCache]: Analyzing trace with hash -445719797, now seen corresponding path program 1 times [2020-07-21 16:42:57,533 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:42:57,534 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1972274288] [2020-07-21 16:42:57,534 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:42:57,603 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:42:57,603 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:42:57,605 INFO L263 TraceCheckSpWp]: Trace formula consists of 100 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-21 16:42:57,610 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:42:57,702 INFO L384 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2020-07-21 16:42:57,704 INFO L544 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-07-21 16:42:57,722 INFO L624 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-07-21 16:42:57,723 INFO L544 ElimStorePlain]: Start of recursive call 1: 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2020-07-21 16:42:57,724 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:20, output treesize:16 [2020-07-21 16:42:57,754 INFO L190 IndexEqualityManager]: detected not equals via solver [2020-07-21 16:42:57,758 INFO L384 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 22 [2020-07-21 16:42:57,761 INFO L544 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-07-21 16:42:57,775 INFO L624 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-07-21 16:42:57,775 INFO L544 ElimStorePlain]: Start of recursive call 1: 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2020-07-21 16:42:57,776 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:31, output treesize:27 [2020-07-21 16:42:57,988 INFO L190 IndexEqualityManager]: detected not equals via solver [2020-07-21 16:42:57,996 INFO L350 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2020-07-21 16:42:57,997 INFO L384 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 1 case distinctions, treesize of input 55 treesize of output 57 [2020-07-21 16:42:57,999 INFO L544 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-07-21 16:42:58,046 INFO L624 ElimStorePlain]: treesize reduction 35, result has 52.1 percent of original size [2020-07-21 16:42:58,050 INFO L544 ElimStorePlain]: Start of recursive call 1: 4 dim-0 vars, 1 dim-2 vars, End of recursive call: 3 dim-0 vars, and 1 xjuncts. [2020-07-21 16:42:58,051 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 5 variables, input treesize:74, output treesize:35 [2020-07-21 16:42:58,103 INFO L190 IndexEqualityManager]: detected not equals via solver [2020-07-21 16:42:58,104 INFO L384 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 10 [2020-07-21 16:42:58,105 INFO L544 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-07-21 16:42:58,117 INFO L624 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-07-21 16:42:58,119 INFO L544 ElimStorePlain]: Start of recursive call 1: 5 dim-0 vars, 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2020-07-21 16:42:58,119 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 6 variables, input treesize:42, output treesize:10 [2020-07-21 16:42:58,145 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 3 disjuncts [2020-07-21 16:42:58,196 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 16:42:58,197 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:42:58,232 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:42:58,493 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:43:08,347 WARN L193 SmtUtils]: Spent 2.03 s on a formula simplification that was a NOOP. DAG size: 52 [2020-07-21 16:43:08,371 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:43:08,426 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 16:43:08,427 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1972274288] [2020-07-21 16:43:08,427 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:43:08,427 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12] total 20 [2020-07-21 16:43:08,428 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [510760714] [2020-07-21 16:43:08,428 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-07-21 16:43:08,428 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:43:08,429 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-07-21 16:43:08,430 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=64, Invalid=313, Unknown=3, NotChecked=0, Total=380 [2020-07-21 16:43:08,430 INFO L87 Difference]: Start difference. First operand 27 states and 29 transitions. Second operand 20 states. [2020-07-21 16:43:11,762 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:43:11,762 INFO L93 Difference]: Finished difference Result 51 states and 59 transitions. [2020-07-21 16:43:11,763 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-07-21 16:43:11,763 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 26 [2020-07-21 16:43:11,763 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:43:11,765 INFO L225 Difference]: With dead ends: 51 [2020-07-21 16:43:11,766 INFO L226 Difference]: Without dead ends: 38 [2020-07-21 16:43:11,767 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 31 SyntacticMatches, 2 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 122 ImplicationChecksByTransitivity, 10.7s TimeCoverageRelationStatistics Valid=105, Invalid=542, Unknown=3, NotChecked=0, Total=650 [2020-07-21 16:43:11,767 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-07-21 16:43:11,773 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 33. [2020-07-21 16:43:11,774 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2020-07-21 16:43:11,775 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 36 transitions. [2020-07-21 16:43:11,775 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 36 transitions. Word has length 26 [2020-07-21 16:43:11,775 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:43:11,775 INFO L479 AbstractCegarLoop]: Abstraction has 33 states and 36 transitions. [2020-07-21 16:43:11,775 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-07-21 16:43:11,776 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 36 transitions. [2020-07-21 16:43:11,777 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-07-21 16:43:11,777 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:43:11,777 INFO L422 BasicCegarLoop]: trace histogram [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] [2020-07-21 16:43:11,990 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:43:11,991 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:43:11,991 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:43:11,991 INFO L82 PathProgramCache]: Analyzing trace with hash 531279049, now seen corresponding path program 2 times [2020-07-21 16:43:11,992 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:43:11,992 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [647345304] [2020-07-21 16:43:11,992 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:43:12,033 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:43:12,033 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:43:12,035 INFO L263 TraceCheckSpWp]: Trace formula consists of 104 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-21 16:43:12,037 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:43:12,076 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 16:43:12,076 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:43:12,121 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 16:43:12,122 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [647345304] [2020-07-21 16:43:12,122 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:43:12,122 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 9 [2020-07-21 16:43:12,122 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [879428348] [2020-07-21 16:43:12,123 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-07-21 16:43:12,123 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:43:12,123 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-07-21 16:43:12,124 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=49, Unknown=0, NotChecked=0, Total=72 [2020-07-21 16:43:12,124 INFO L87 Difference]: Start difference. First operand 33 states and 36 transitions. Second operand 9 states. [2020-07-21 16:43:12,314 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:43:12,314 INFO L93 Difference]: Finished difference Result 45 states and 50 transitions. [2020-07-21 16:43:12,315 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-21 16:43:12,315 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 28 [2020-07-21 16:43:12,315 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:43:12,316 INFO L225 Difference]: With dead ends: 45 [2020-07-21 16:43:12,316 INFO L226 Difference]: Without dead ends: 39 [2020-07-21 16:43:12,317 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 60 GetRequests, 45 SyntacticMatches, 3 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 23 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=59, Invalid=123, Unknown=0, NotChecked=0, Total=182 [2020-07-21 16:43:12,317 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2020-07-21 16:43:12,323 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 35. [2020-07-21 16:43:12,323 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-07-21 16:43:12,324 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 39 transitions. [2020-07-21 16:43:12,324 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 39 transitions. Word has length 28 [2020-07-21 16:43:12,324 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:43:12,325 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 39 transitions. [2020-07-21 16:43:12,325 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-07-21 16:43:12,325 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 39 transitions. [2020-07-21 16:43:12,326 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2020-07-21 16:43:12,326 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:43:12,326 INFO L422 BasicCegarLoop]: trace histogram [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] [2020-07-21 16:43:12,529 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:43:12,530 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:43:12,531 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:43:12,531 INFO L82 PathProgramCache]: Analyzing trace with hash -1018004383, now seen corresponding path program 3 times [2020-07-21 16:43:12,532 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:43:12,533 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1871737594] [2020-07-21 16:43:12,533 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:43:12,585 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:43:12,585 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:43:12,586 INFO L263 TraceCheckSpWp]: Trace formula consists of 108 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-21 16:43:12,588 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:43:12,641 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 5 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 16:43:12,641 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:43:12,681 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 5 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 16:43:12,682 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1871737594] [2020-07-21 16:43:12,682 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:43:12,682 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 9 [2020-07-21 16:43:12,683 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1447291982] [2020-07-21 16:43:12,683 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-07-21 16:43:12,683 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:43:12,684 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-07-21 16:43:12,685 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=49, Unknown=0, NotChecked=0, Total=72 [2020-07-21 16:43:12,685 INFO L87 Difference]: Start difference. First operand 35 states and 39 transitions. Second operand 9 states. [2020-07-21 16:43:12,808 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:43:12,808 INFO L93 Difference]: Finished difference Result 49 states and 55 transitions. [2020-07-21 16:43:12,809 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-21 16:43:12,809 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 29 [2020-07-21 16:43:12,810 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:43:12,810 INFO L225 Difference]: With dead ends: 49 [2020-07-21 16:43:12,811 INFO L226 Difference]: Without dead ends: 35 [2020-07-21 16:43:12,811 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 60 GetRequests, 47 SyntacticMatches, 3 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=45, Invalid=87, Unknown=0, NotChecked=0, Total=132 [2020-07-21 16:43:12,812 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2020-07-21 16:43:12,816 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 32. [2020-07-21 16:43:12,816 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2020-07-21 16:43:12,817 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 35 transitions. [2020-07-21 16:43:12,817 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 35 transitions. Word has length 29 [2020-07-21 16:43:12,817 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:43:12,817 INFO L479 AbstractCegarLoop]: Abstraction has 32 states and 35 transitions. [2020-07-21 16:43:12,817 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-07-21 16:43:12,818 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 35 transitions. [2020-07-21 16:43:12,818 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2020-07-21 16:43:12,818 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:43:12,818 INFO L422 BasicCegarLoop]: trace histogram [2, 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] [2020-07-21 16:43:13,019 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:43:13,020 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:43:13,020 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:43:13,020 INFO L82 PathProgramCache]: Analyzing trace with hash 2056219107, now seen corresponding path program 4 times [2020-07-21 16:43:13,021 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:43:13,021 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [4210981] [2020-07-21 16:43:13,022 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:43:13,066 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:43:13,067 INFO L229 tOrderPrioritization]: Conjunction of SSA is sat [2020-07-21 16:43:13,067 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-07-21 16:43:13,083 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-07-21 16:43:13,083 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-07-21 16:43:13,112 INFO L174 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2020-07-21 16:43:13,116 INFO L520 BasicCegarLoop]: Counterexample might be feasible [2020-07-21 16:43:13,325 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:43:13,364 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 21.07 04:43:13 BoogieIcfgContainer [2020-07-21 16:43:13,365 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-07-21 16:43:13,366 INFO L168 Benchmark]: Toolchain (without parser) took 17647.09 ms. Allocated memory was 136.3 MB in the beginning and 251.1 MB in the end (delta: 114.8 MB). Free memory was 99.3 MB in the beginning and 102.2 MB in the end (delta: -2.9 MB). Peak memory consumption was 111.9 MB. Max. memory is 7.1 GB. [2020-07-21 16:43:13,367 INFO L168 Benchmark]: CDTParser took 0.51 ms. Allocated memory is still 136.3 MB. Free memory was 118.1 MB in the beginning and 117.9 MB in the end (delta: 209.9 kB). Peak memory consumption was 209.9 kB. Max. memory is 7.1 GB. [2020-07-21 16:43:13,368 INFO L168 Benchmark]: CACSL2BoogieTranslator took 290.21 ms. Allocated memory is still 136.3 MB. Free memory was 99.1 MB in the beginning and 88.7 MB in the end (delta: 10.4 MB). Peak memory consumption was 10.4 MB. Max. memory is 7.1 GB. [2020-07-21 16:43:13,369 INFO L168 Benchmark]: Boogie Preprocessor took 127.82 ms. Allocated memory was 136.3 MB in the beginning and 199.2 MB in the end (delta: 62.9 MB). Free memory was 88.7 MB in the beginning and 176.6 MB in the end (delta: -87.9 MB). Peak memory consumption was 13.8 MB. Max. memory is 7.1 GB. [2020-07-21 16:43:13,369 INFO L168 Benchmark]: RCFGBuilder took 419.94 ms. Allocated memory is still 199.2 MB. Free memory was 176.6 MB in the beginning and 159.6 MB in the end (delta: 17.0 MB). Peak memory consumption was 17.0 MB. Max. memory is 7.1 GB. [2020-07-21 16:43:13,370 INFO L168 Benchmark]: TraceAbstraction took 16803.25 ms. Allocated memory was 199.2 MB in the beginning and 251.1 MB in the end (delta: 51.9 MB). Free memory was 159.0 MB in the beginning and 102.2 MB in the end (delta: 56.8 MB). Peak memory consumption was 108.7 MB. Max. memory is 7.1 GB. [2020-07-21 16:43:13,374 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.51 ms. Allocated memory is still 136.3 MB. Free memory was 118.1 MB in the beginning and 117.9 MB in the end (delta: 209.9 kB). Peak memory consumption was 209.9 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 290.21 ms. Allocated memory is still 136.3 MB. Free memory was 99.1 MB in the beginning and 88.7 MB in the end (delta: 10.4 MB). Peak memory consumption was 10.4 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 127.82 ms. Allocated memory was 136.3 MB in the beginning and 199.2 MB in the end (delta: 62.9 MB). Free memory was 88.7 MB in the beginning and 176.6 MB in the end (delta: -87.9 MB). Peak memory consumption was 13.8 MB. Max. memory is 7.1 GB. * RCFGBuilder took 419.94 ms. Allocated memory is still 199.2 MB. Free memory was 176.6 MB in the beginning and 159.6 MB in the end (delta: 17.0 MB). Peak memory consumption was 17.0 MB. Max. memory is 7.1 GB. * TraceAbstraction took 16803.25 ms. Allocated memory was 199.2 MB in the beginning and 251.1 MB in the end (delta: 51.9 MB). Free memory was 159.0 MB in the beginning and 102.2 MB in the end (delta: 56.8 MB). Peak memory consumption was 108.7 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 13]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_error() is reachable We found a FailurePath: [L17] int N; VAL [\old(N)=7, N=0] [L21] N = __VERIFIER_nondet_int() [L22] COND FALSE !(N <= 0) VAL [\old(N)=0, N=2] [L23] CALL assume_abort_if_not(N <= 2147483647/sizeof(int)) VAL [\old(cond)=1, \old(N)=0, N=2] [L11] COND FALSE !(!cond) VAL [\old(cond)=1, \old(N)=0, cond=1, N=2] [L23] RET assume_abort_if_not(N <= 2147483647/sizeof(int)) VAL [\old(N)=0, N=2] [L25] int i; [L26] long long sum[1]; [L27] int *a = malloc(sizeof(int)*N); [L29] sum[0] = 1 [L30] i=0 VAL [\old(N)=0, a={32286:0}, i=0, malloc(sizeof(int)*N)={32286:0}, N=2, sum={32288:0}] [L30] COND TRUE i