/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 BIGGEST_EQUIVALENCE_CLASS --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/verifythis/tree_del_iter.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-21 23:40:38,022 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-21 23:40:38,024 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-21 23:40:38,037 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-21 23:40:38,037 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-21 23:40:38,039 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-21 23:40:38,040 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-21 23:40:38,042 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-21 23:40:38,044 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-21 23:40:38,045 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-21 23:40:38,046 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-21 23:40:38,047 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-21 23:40:38,047 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-21 23:40:38,048 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-21 23:40:38,050 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-21 23:40:38,051 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-21 23:40:38,052 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-21 23:40:38,053 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-21 23:40:38,054 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-21 23:40:38,056 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-21 23:40:38,058 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-21 23:40:38,059 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-21 23:40:38,060 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-21 23:40:38,061 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-21 23:40:38,063 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-21 23:40:38,071 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-21 23:40:38,072 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-21 23:40:38,073 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-21 23:40:38,074 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 23:40:38,089 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-21 23:40:38,089 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-21 23:40:38,090 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-21 23:40:38,090 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-21 23:40:38,091 INFO L138 SettingsManager]: * Use SBE=true [2020-07-21 23:40:38,091 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-21 23:40:38,091 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-21 23:40:38,091 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-21 23:40:38,091 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-21 23:40:38,092 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-21 23:40:38,092 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-21 23:40:38,092 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-21 23:40:38,092 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-21 23:40:38,092 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-21 23:40:38,093 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-21 23:40:38,093 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-21 23:40:38,093 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-21 23:40:38,093 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-21 23:40:38,093 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-21 23:40:38,094 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-21 23:40:38,094 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-21 23:40:38,094 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 23:40:38,094 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-21 23:40:38,095 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-21 23:40:38,095 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-21 23:40:38,095 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-21 23:40:38,095 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:40:38,095 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-21 23:40:38,096 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-21 23:40:38,096 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 -> BIGGEST_EQUIVALENCE_CLASS 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 [2020-07-21 23:40:38,420 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-21 23:40:38,436 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-21 23:40:38,442 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-21 23:40:38,444 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-21 23:40:38,445 INFO L275 PluginConnector]: CDTParser initialized [2020-07-21 23:40:38,446 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/verifythis/tree_del_iter.c [2020-07-21 23:40:38,531 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/737640178/17fdc77b93d146bdae8cbd956124f776/FLAG757312350 [2020-07-21 23:40:39,058 INFO L306 CDTParser]: Found 1 translation units. [2020-07-21 23:40:39,059 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/verifythis/tree_del_iter.c [2020-07-21 23:40:39,068 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/737640178/17fdc77b93d146bdae8cbd956124f776/FLAG757312350 [2020-07-21 23:40:39,424 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/737640178/17fdc77b93d146bdae8cbd956124f776 [2020-07-21 23:40:39,435 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-21 23:40:39,438 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-21 23:40:39,439 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-21 23:40:39,439 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-21 23:40:39,443 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-21 23:40:39,444 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 11:40:39" (1/1) ... [2020-07-21 23:40:39,448 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@3f146373 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:40:39, skipping insertion in model container [2020-07-21 23:40:39,448 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 11:40:39" (1/1) ... [2020-07-21 23:40:39,456 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-21 23:40:39,480 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-21 23:40:39,662 WARN L1484 CHandler]: Possible shadowing of function min [2020-07-21 23:40:39,681 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 23:40:39,703 INFO L203 MainTranslator]: Completed pre-run [2020-07-21 23:40:39,811 WARN L1484 CHandler]: Possible shadowing of function min [2020-07-21 23:40:39,824 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 23:40:39,847 INFO L208 MainTranslator]: Completed translation [2020-07-21 23:40:39,848 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:40:39 WrapperNode [2020-07-21 23:40:39,848 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-21 23:40:39,849 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-21 23:40:39,849 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-21 23:40:39,849 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-21 23:40:39,864 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:40:39" (1/1) ... [2020-07-21 23:40:39,864 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:40:39" (1/1) ... [2020-07-21 23:40:39,877 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:40:39" (1/1) ... [2020-07-21 23:40:39,877 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:40:39" (1/1) ... [2020-07-21 23:40:39,897 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:40:39" (1/1) ... [2020-07-21 23:40:39,911 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:40:39" (1/1) ... [2020-07-21 23:40:39,919 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:40:39" (1/1) ... [2020-07-21 23:40:39,926 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-21 23:40:39,927 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-21 23:40:39,927 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-21 23:40:39,927 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-21 23:40:39,930 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:40:39" (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 23:40:40,000 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-21 23:40:40,000 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-21 23:40:40,001 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_cycle_if_not [2020-07-21 23:40:40,001 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-07-21 23:40:40,002 INFO L138 BoogieDeclarations]: Found implementation of procedure nondet_tree [2020-07-21 23:40:40,002 INFO L138 BoogieDeclarations]: Found implementation of procedure min [2020-07-21 23:40:40,002 INFO L138 BoogieDeclarations]: Found implementation of procedure tree_del [2020-07-21 23:40:40,002 INFO L138 BoogieDeclarations]: Found implementation of procedure tree_inorder [2020-07-21 23:40:40,003 INFO L138 BoogieDeclarations]: Found implementation of procedure size [2020-07-21 23:40:40,003 INFO L138 BoogieDeclarations]: Found implementation of procedure task [2020-07-21 23:40:40,003 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-21 23:40:40,003 INFO L138 BoogieDeclarations]: Found implementation of procedure #Ultimate.meminit [2020-07-21 23:40:40,003 INFO L130 BoogieDeclarations]: Found specification of procedure calloc [2020-07-21 23:40:40,005 INFO L130 BoogieDeclarations]: Found specification of procedure malloc [2020-07-21 23:40:40,005 INFO L130 BoogieDeclarations]: Found specification of procedure free [2020-07-21 23:40:40,005 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-21 23:40:40,005 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_bool [2020-07-21 23:40:40,006 INFO L130 BoogieDeclarations]: Found specification of procedure assume_cycle_if_not [2020-07-21 23:40:40,006 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-21 23:40:40,006 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-07-21 23:40:40,006 INFO L130 BoogieDeclarations]: Found specification of procedure nondet_tree [2020-07-21 23:40:40,007 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2020-07-21 23:40:40,007 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-07-21 23:40:40,007 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2020-07-21 23:40:40,007 INFO L130 BoogieDeclarations]: Found specification of procedure min [2020-07-21 23:40:40,007 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-07-21 23:40:40,007 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2020-07-21 23:40:40,007 INFO L130 BoogieDeclarations]: Found specification of procedure tree_del [2020-07-21 23:40:40,008 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-07-21 23:40:40,008 INFO L130 BoogieDeclarations]: Found specification of procedure tree_inorder [2020-07-21 23:40:40,008 INFO L130 BoogieDeclarations]: Found specification of procedure size [2020-07-21 23:40:40,008 INFO L130 BoogieDeclarations]: Found specification of procedure task [2020-07-21 23:40:40,008 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-07-21 23:40:40,008 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.meminit [2020-07-21 23:40:40,008 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-21 23:40:40,009 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-21 23:40:40,009 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-21 23:40:40,606 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-21 23:40:40,607 INFO L295 CfgBuilder]: Removed 3 assume(true) statements. [2020-07-21 23:40:40,612 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 11:40:40 BoogieIcfgContainer [2020-07-21 23:40:40,612 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-21 23:40:40,614 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-21 23:40:40,614 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-21 23:40:40,618 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-21 23:40:40,618 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.07 11:40:39" (1/3) ... [2020-07-21 23:40:40,619 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1f052d40 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 11:40:40, skipping insertion in model container [2020-07-21 23:40:40,619 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:40:39" (2/3) ... [2020-07-21 23:40:40,620 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1f052d40 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 11:40:40, skipping insertion in model container [2020-07-21 23:40:40,620 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 11:40:40" (3/3) ... [2020-07-21 23:40:40,623 INFO L109 eAbstractionObserver]: Analyzing ICFG tree_del_iter.c [2020-07-21 23:40:40,635 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-21 23:40:40,643 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-21 23:40:40,659 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-21 23:40:40,684 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-21 23:40:40,684 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-21 23:40:40,685 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-21 23:40:40,685 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-21 23:40:40,685 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-21 23:40:40,685 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-21 23:40:40,685 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-21 23:40:40,686 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-21 23:40:40,708 INFO L276 IsEmpty]: Start isEmpty. Operand 98 states. [2020-07-21 23:40:40,717 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2020-07-21 23:40:40,717 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:40:40,718 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:40:40,719 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:40:40,724 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:40:40,725 INFO L82 PathProgramCache]: Analyzing trace with hash 806421993, now seen corresponding path program 1 times [2020-07-21 23:40:40,733 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:40:40,733 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1826402407] [2020-07-21 23:40:40,734 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 [2020-07-21 23:40:40,869 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-21 23:40:40,869 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:40:40,873 INFO L263 TraceCheckSpWp]: Trace formula consists of 157 conjuncts, 11 conjunts are in the unsatisfiable core [2020-07-21 23:40:40,882 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:40:40,969 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 23:40:40,970 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 23:40:40,971 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1826402407] [2020-07-21 23:40:40,972 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 23:40:40,973 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2020-07-21 23:40:40,974 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1116865610] [2020-07-21 23:40:40,979 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-07-21 23:40:40,980 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:40:40,995 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-07-21 23:40:40,996 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2020-07-21 23:40:40,998 INFO L87 Difference]: Start difference. First operand 98 states. Second operand 7 states. [2020-07-21 23:40:41,121 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:40:41,121 INFO L93 Difference]: Finished difference Result 167 states and 221 transitions. [2020-07-21 23:40:41,127 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-21 23:40:41,128 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 44 [2020-07-21 23:40:41,129 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:40:41,142 INFO L225 Difference]: With dead ends: 167 [2020-07-21 23:40:41,142 INFO L226 Difference]: Without dead ends: 91 [2020-07-21 23:40:41,147 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 38 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=41, Unknown=0, NotChecked=0, Total=56 [2020-07-21 23:40:41,167 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 91 states. [2020-07-21 23:40:41,216 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 91 to 91. [2020-07-21 23:40:41,217 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 91 states. [2020-07-21 23:40:41,221 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 91 states to 91 states and 115 transitions. [2020-07-21 23:40:41,223 INFO L78 Accepts]: Start accepts. Automaton has 91 states and 115 transitions. Word has length 44 [2020-07-21 23:40:41,224 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:40:41,224 INFO L479 AbstractCegarLoop]: Abstraction has 91 states and 115 transitions. [2020-07-21 23:40:41,224 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-07-21 23:40:41,224 INFO L276 IsEmpty]: Start isEmpty. Operand 91 states and 115 transitions. [2020-07-21 23:40:41,228 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2020-07-21 23:40:41,228 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:40:41,229 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:40:41,430 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:40:41,430 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:40:41,431 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:40:41,431 INFO L82 PathProgramCache]: Analyzing trace with hash -1561052270, now seen corresponding path program 1 times [2020-07-21 23:40:41,432 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:40:41,433 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1863086883] [2020-07-21 23:40:41,433 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 [2020-07-21 23:40:41,577 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-21 23:40:41,577 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:40:41,579 INFO L263 TraceCheckSpWp]: Trace formula consists of 152 conjuncts, 25 conjunts are in the unsatisfiable core [2020-07-21 23:40:41,596 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:40:41,689 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 4 proven. 2 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2020-07-21 23:40:41,689 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 23:40:41,843 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 4 proven. 2 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2020-07-21 23:40:41,844 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1863086883] [2020-07-21 23:40:41,844 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 23:40:41,844 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 9 [2020-07-21 23:40:41,845 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [704729164] [2020-07-21 23:40:41,846 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-07-21 23:40:41,847 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:40:41,847 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-07-21 23:40:41,847 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=55, Unknown=0, NotChecked=0, Total=72 [2020-07-21 23:40:41,847 INFO L87 Difference]: Start difference. First operand 91 states and 115 transitions. Second operand 9 states. [2020-07-21 23:40:41,995 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:40:41,996 INFO L93 Difference]: Finished difference Result 161 states and 204 transitions. [2020-07-21 23:40:41,996 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-21 23:40:41,997 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 56 [2020-07-21 23:40:41,997 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:40:42,000 INFO L225 Difference]: With dead ends: 161 [2020-07-21 23:40:42,000 INFO L226 Difference]: Without dead ends: 93 [2020-07-21 23:40:42,002 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 114 GetRequests, 104 SyntacticMatches, 1 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=26, Invalid=84, Unknown=0, NotChecked=0, Total=110 [2020-07-21 23:40:42,003 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 93 states. [2020-07-21 23:40:42,016 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 93 to 93. [2020-07-21 23:40:42,016 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 93 states. [2020-07-21 23:40:42,018 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 93 states to 93 states and 118 transitions. [2020-07-21 23:40:42,019 INFO L78 Accepts]: Start accepts. Automaton has 93 states and 118 transitions. Word has length 56 [2020-07-21 23:40:42,019 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:40:42,019 INFO L479 AbstractCegarLoop]: Abstraction has 93 states and 118 transitions. [2020-07-21 23:40:42,019 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-07-21 23:40:42,020 INFO L276 IsEmpty]: Start isEmpty. Operand 93 states and 118 transitions. [2020-07-21 23:40:42,022 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2020-07-21 23:40:42,023 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:40:42,023 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:40:42,238 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:40:42,238 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:40:42,239 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:40:42,239 INFO L82 PathProgramCache]: Analyzing trace with hash -217941329, now seen corresponding path program 1 times [2020-07-21 23:40:42,240 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:40:42,240 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1487151155] [2020-07-21 23:40:42,240 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 [2020-07-21 23:40:42,348 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-21 23:40:42,349 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:40:42,350 INFO L263 TraceCheckSpWp]: Trace formula consists of 200 conjuncts, 17 conjunts are in the unsatisfiable core [2020-07-21 23:40:42,355 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:40:42,425 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2020-07-21 23:40:42,425 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 23:40:42,426 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1487151155] [2020-07-21 23:40:42,427 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 23:40:42,427 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2020-07-21 23:40:42,427 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [696155489] [2020-07-21 23:40:42,428 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-07-21 23:40:42,428 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:40:42,429 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-07-21 23:40:42,429 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=57, Unknown=0, NotChecked=0, Total=72 [2020-07-21 23:40:42,429 INFO L87 Difference]: Start difference. First operand 93 states and 118 transitions. Second operand 9 states. [2020-07-21 23:40:42,619 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:40:42,619 INFO L93 Difference]: Finished difference Result 160 states and 203 transitions. [2020-07-21 23:40:42,620 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-21 23:40:42,620 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 66 [2020-07-21 23:40:42,621 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:40:42,623 INFO L225 Difference]: With dead ends: 160 [2020-07-21 23:40:42,623 INFO L226 Difference]: Without dead ends: 95 [2020-07-21 23:40:42,624 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 69 GetRequests, 59 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=27, Invalid=105, Unknown=0, NotChecked=0, Total=132 [2020-07-21 23:40:42,625 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 95 states. [2020-07-21 23:40:42,639 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 95 to 95. [2020-07-21 23:40:42,639 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 95 states. [2020-07-21 23:40:42,641 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 95 states to 95 states and 121 transitions. [2020-07-21 23:40:42,641 INFO L78 Accepts]: Start accepts. Automaton has 95 states and 121 transitions. Word has length 66 [2020-07-21 23:40:42,642 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:40:42,642 INFO L479 AbstractCegarLoop]: Abstraction has 95 states and 121 transitions. [2020-07-21 23:40:42,642 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-07-21 23:40:42,642 INFO L276 IsEmpty]: Start isEmpty. Operand 95 states and 121 transitions. [2020-07-21 23:40:42,647 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2020-07-21 23:40:42,648 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:40:42,648 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:40:42,862 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:40:42,863 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:40:42,863 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:40:42,863 INFO L82 PathProgramCache]: Analyzing trace with hash -62868055, now seen corresponding path program 1 times [2020-07-21 23:40:42,865 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:40:42,865 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2062245082] [2020-07-21 23:40:42,866 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 [2020-07-21 23:40:43,027 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 23:40:43,028 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:40:43,032 INFO L263 TraceCheckSpWp]: Trace formula consists of 377 conjuncts, 39 conjunts are in the unsatisfiable core [2020-07-21 23:40:43,036 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:40:43,147 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 8 proven. 2 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2020-07-21 23:40:43,148 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 23:40:43,462 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 8 proven. 2 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2020-07-21 23:40:43,463 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2062245082] [2020-07-21 23:40:43,463 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 23:40:43,463 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12] total 18 [2020-07-21 23:40:43,464 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [690440129] [2020-07-21 23:40:43,465 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-07-21 23:40:43,465 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:40:43,465 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-07-21 23:40:43,465 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=264, Unknown=0, NotChecked=0, Total=306 [2020-07-21 23:40:43,466 INFO L87 Difference]: Start difference. First operand 95 states and 121 transitions. Second operand 18 states. [2020-07-21 23:40:43,835 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:40:43,836 INFO L93 Difference]: Finished difference Result 150 states and 192 transitions. [2020-07-21 23:40:43,836 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-21 23:40:43,836 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 79 [2020-07-21 23:40:43,837 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:40:43,839 INFO L225 Difference]: With dead ends: 150 [2020-07-21 23:40:43,839 INFO L226 Difference]: Without dead ends: 97 [2020-07-21 23:40:43,841 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 164 GetRequests, 142 SyntacticMatches, 1 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=71, Invalid=435, Unknown=0, NotChecked=0, Total=506 [2020-07-21 23:40:43,841 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 97 states. [2020-07-21 23:40:43,854 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 97 to 97. [2020-07-21 23:40:43,854 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 97 states. [2020-07-21 23:40:43,856 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 97 states to 97 states and 125 transitions. [2020-07-21 23:40:43,856 INFO L78 Accepts]: Start accepts. Automaton has 97 states and 125 transitions. Word has length 79 [2020-07-21 23:40:43,857 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:40:43,857 INFO L479 AbstractCegarLoop]: Abstraction has 97 states and 125 transitions. [2020-07-21 23:40:43,857 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-07-21 23:40:43,857 INFO L276 IsEmpty]: Start isEmpty. Operand 97 states and 125 transitions. [2020-07-21 23:40:43,859 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 92 [2020-07-21 23:40:43,859 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:40:43,860 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 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, 1, 1, 1, 1, 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 23:40:44,074 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:40:44,074 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:40:44,074 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:40:44,075 INFO L82 PathProgramCache]: Analyzing trace with hash -708508396, now seen corresponding path program 1 times [2020-07-21 23:40:44,075 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:40:44,076 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2022105917] [2020-07-21 23:40:44,076 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 [2020-07-21 23:40:44,300 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 23:40:44,300 INFO L229 tOrderPrioritization]: Conjunction of SSA is sat [2020-07-21 23:40:44,301 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-07-21 23:40:44,357 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-07-21 23:40:44,358 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-07-21 23:40:44,422 INFO L174 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2020-07-21 23:40:44,423 INFO L520 BasicCegarLoop]: Counterexample might be feasible [2020-07-21 23:40:44,637 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:40:44,712 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 21.07 11:40:44 BoogieIcfgContainer [2020-07-21 23:40:44,712 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-07-21 23:40:44,715 INFO L168 Benchmark]: Toolchain (without parser) took 5277.37 ms. Allocated memory was 137.4 MB in the beginning and 249.6 MB in the end (delta: 112.2 MB). Free memory was 101.0 MB in the beginning and 135.2 MB in the end (delta: -34.2 MB). Peak memory consumption was 78.0 MB. Max. memory is 7.1 GB. [2020-07-21 23:40:44,716 INFO L168 Benchmark]: CDTParser took 0.60 ms. Allocated memory is still 137.4 MB. Free memory was 120.4 MB in the beginning and 120.2 MB in the end (delta: 209.9 kB). Peak memory consumption was 209.9 kB. Max. memory is 7.1 GB. [2020-07-21 23:40:44,718 INFO L168 Benchmark]: CACSL2BoogieTranslator took 409.05 ms. Allocated memory was 137.4 MB in the beginning and 200.8 MB in the end (delta: 63.4 MB). Free memory was 100.6 MB in the beginning and 176.4 MB in the end (delta: -75.9 MB). Peak memory consumption was 23.5 MB. Max. memory is 7.1 GB. [2020-07-21 23:40:44,718 INFO L168 Benchmark]: Boogie Preprocessor took 77.49 ms. Allocated memory is still 200.8 MB. Free memory was 176.4 MB in the beginning and 174.4 MB in the end (delta: 2.0 MB). Peak memory consumption was 2.0 MB. Max. memory is 7.1 GB. [2020-07-21 23:40:44,719 INFO L168 Benchmark]: RCFGBuilder took 686.05 ms. Allocated memory is still 200.8 MB. Free memory was 173.7 MB in the beginning and 138.7 MB in the end (delta: 35.0 MB). Peak memory consumption was 35.0 MB. Max. memory is 7.1 GB. [2020-07-21 23:40:44,720 INFO L168 Benchmark]: TraceAbstraction took 4098.70 ms. Allocated memory was 200.8 MB in the beginning and 249.6 MB in the end (delta: 48.8 MB). Free memory was 138.0 MB in the beginning and 135.2 MB in the end (delta: 2.8 MB). Peak memory consumption was 51.6 MB. Max. memory is 7.1 GB. [2020-07-21 23:40:44,724 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.60 ms. Allocated memory is still 137.4 MB. Free memory was 120.4 MB in the beginning and 120.2 MB in the end (delta: 209.9 kB). Peak memory consumption was 209.9 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 409.05 ms. Allocated memory was 137.4 MB in the beginning and 200.8 MB in the end (delta: 63.4 MB). Free memory was 100.6 MB in the beginning and 176.4 MB in the end (delta: -75.9 MB). Peak memory consumption was 23.5 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 77.49 ms. Allocated memory is still 200.8 MB. Free memory was 176.4 MB in the beginning and 174.4 MB in the end (delta: 2.0 MB). Peak memory consumption was 2.0 MB. Max. memory is 7.1 GB. * RCFGBuilder took 686.05 ms. Allocated memory is still 200.8 MB. Free memory was 173.7 MB in the beginning and 138.7 MB in the end (delta: 35.0 MB). Peak memory consumption was 35.0 MB. Max. memory is 7.1 GB. * TraceAbstraction took 4098.70 ms. Allocated memory was 200.8 MB in the beginning and 249.6 MB in the end (delta: 48.8 MB). Free memory was 138.0 MB in the beginning and 135.2 MB in the end (delta: 2.8 MB). Peak memory consumption was 51.6 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 14]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_error() is reachable We found a FailurePath: [L108] CALL, EXPR nondet_tree() [L23] COND FALSE !(__VERIFIER_nondet_bool()) [L26] struct node *n = (struct node *)malloc(sizeof(struct node)); [L27] n->data = __VERIFIER_nondet_int() [L28] CALL, EXPR nondet_tree() [L23] COND TRUE __VERIFIER_nondet_bool() [L24] return 0; VAL [\result={0:0}] [L28] RET, EXPR nondet_tree() VAL [malloc(sizeof(struct node))={-2:0}, n={-2:0}, nondet_tree()={0:0}] [L28] n->left = nondet_tree() [L29] CALL, EXPR nondet_tree() [L23] COND TRUE __VERIFIER_nondet_bool() [L24] return 0; VAL [\result={0:0}] [L29] RET, EXPR nondet_tree() VAL [malloc(sizeof(struct node))={-2:0}, n={-2:0}, nondet_tree()={0:0}] [L29] n->right = nondet_tree() [L30] return n; VAL [\result={-2:0}, malloc(sizeof(struct node))={-2:0}, n={-2:0}] [L108] RET, EXPR nondet_tree() VAL [nondet_tree()={-2:0}] [L108] CALL task(nondet_tree()) VAL [t={-2:0}] [L84] CALL, EXPR min(t) VAL [n={-2:0}] [L35] COND FALSE !(!n) [L38] EXPR n->data [L38] int a = n->data; [L39] EXPR n->left VAL [a=2147483647, n={-2:0}, n={-2:0}, n->left={0:0}] [L39] CALL, EXPR min(n->left) VAL [n={0:0}] [L35] COND TRUE !n [L36] return 2147483647; VAL [\result=2147483647, n={0:0}, n={0:0}] [L39] RET, EXPR min(n->left) VAL [a=2147483647, min(n->left)=2147483647, n={-2:0}, n={-2:0}, n->left={0:0}] [L39] int b = min(n->left); [L40] EXPR n->right VAL [a=2147483647, b=2147483647, n={-2:0}, n={-2:0}, n->right={0:0}] [L40] CALL, EXPR min(n->right) VAL [n={0:0}] [L35] COND TRUE !n [L36] return 2147483647; VAL [\result=2147483647, n={0:0}, n={0:0}] [L40] RET, EXPR min(n->right) VAL [a=2147483647, b=2147483647, min(n->right)=2147483647, n={-2:0}, n={-2:0}, n->right={0:0}] [L40] int c = min(n->right); [L41] COND TRUE b <= a && b <= c [L41] return b; VAL [\result=2147483647, a=2147483647, b=2147483647, c=2147483647, n={-2:0}, n={-2:0}] [L84] RET, EXPR min(t) VAL [min(t)=2147483647, t={-2:0}, t={-2:0}] [L84] int a = min(t); [L85] int b; VAL [a=2147483647, b={2:0}, t={-2:0}, t={-2:0}] [L87] CALL, EXPR size(t) VAL [t={-2:0}] [L79] COND FALSE !(!t) [L80] EXPR t->left VAL [t={-2:0}, t={-2:0}, t->left={0:0}] [L80] CALL, EXPR size(t->left) VAL [t={0:0}] [L79] COND TRUE !t [L79] return 0; VAL [\result=0, t={0:0}, t={0:0}] [L80] RET, EXPR size(t->left) VAL [size(t->left)=0, t={-2:0}, t={-2:0}, t->left={0:0}] [L80] EXPR t->right VAL [size(t->left)=0, t={-2:0}, t={-2:0}, t->left={0:0}, t->right={0:0}] [L80] CALL, EXPR size(t->right) VAL [t={0:0}] [L79] COND TRUE !t [L79] return 0; VAL [\result=0, t={0:0}, t={0:0}] [L80] RET, EXPR size(t->right) VAL [size(t->left)=0, size(t->right)=0, t={-2:0}, t={-2:0}, t->left={0:0}, t->right={0:0}] [L80] return size(t->left) + size(t->right) + 1; [L87] RET, EXPR size(t) VAL [a=2147483647, b={2:0}, size(t)=1, t={-2:0}, t={-2:0}] [L87] int n = size(t); [L88] CALL assume_cycle_if_not(n != 0) VAL [\old(cond)=1] [L9] COND FALSE !(!cond) VAL [\old(cond)=1, cond=1] [L88] RET assume_cycle_if_not(n != 0) VAL [a=2147483647, b={2:0}, n=1, t={-2:0}, t={-2:0}] [L89] EXPR, FCALL calloc(n, sizeof(int)) VAL [a=2147483647, b={2:0}, calloc(n, sizeof(int))={-1:0}, n=1, t={-2:0}, t={-2:0}] [L89] int *x = calloc(n, sizeof(int)); VAL [a=2147483647, b={2:0}, calloc(n, sizeof(int))={-1:0}, n=1, t={-2:0}, t={-2:0}, x={-1:0}] [L90] CALL tree_inorder(t, x, n) VAL [\old(i)=1, a={-1:0}, t={-2:0}] [L68] COND FALSE !(!t) [L71] EXPR t->left VAL [\old(i)=1, a={-1:0}, a={-1:0}, i=1, t={-2:0}, t={-2:0}, t->left={0:0}] [L71] CALL, EXPR tree_inorder(t->left, a, i) VAL [\old(i)=1, a={-1:0}, t={0:0}] [L68] COND TRUE !t [L69] return i; VAL [\old(i)=1, \result=1, a={-1:0}, a={-1:0}, i=1, t={0:0}, t={0:0}] [L71] RET, EXPR tree_inorder(t->left, a, i) VAL [\old(i)=1, a={-1:0}, a={-1:0}, i=1, t={-2:0}, t={-2:0}, t->left={0:0}, tree_inorder(t->left, a, i)=1] [L71] i = tree_inorder(t->left, a, i) [L72] EXPR i++ [L72] EXPR t->data [L72] a[i++] = t->data [L73] EXPR t->right VAL [\old(i)=1, a={-1:0}, a={-1:0}, i=2, t={-2:0}, t={-2:0}, t->right={0:0}] [L73] CALL, EXPR tree_inorder(t->right, a, i) VAL [\old(i)=2, a={-1:0}, t={0:0}] [L68] COND TRUE !t [L69] return i; VAL [\old(i)=2, \result=2, a={-1:0}, a={-1:0}, i=2, t={0:0}, t={0:0}] [L73] RET, EXPR tree_inorder(t->right, a, i) VAL [\old(i)=1, a={-1:0}, a={-1:0}, i=2, t={-2:0}, t={-2:0}, t->right={0:0}, tree_inorder(t->right, a, i)=2] [L73] i = tree_inorder(t->right, a, i) [L74] return i; VAL [\old(i)=1, \result=2, a={-1:0}, a={-1:0}, i=2, t={-2:0}, t={-2:0}] [L90] RET tree_inorder(t, x, n) VAL [a=2147483647, b={2:0}, calloc(n, sizeof(int))={-1:0}, n=1, t={-2:0}, t={-2:0}, tree_inorder(t, x, n)=2, x={-1:0}] [L91] EXPR x[0] VAL [a=2147483647, b={2:0}, calloc(n, sizeof(int))={-1:0}, n=1, t={-2:0}, t={-2:0}, x={-1:0}, x[0]=0] [L91] CALL __VERIFIER_assert(a == x[0]) VAL [\old(cond)=0] [L14] COND TRUE !cond VAL [\old(cond)=0, cond=0] [L14] __VERIFIER_error() VAL [\old(cond)=0, cond=0] - StatisticsResult: Ultimate Automizer benchmark data CFG has 12 procedures, 98 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 3.9s, OverallIterations: 5, TraceHistogramMax: 3, AutomataDifference: 0.8s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 426 SDtfs, 125 SDslu, 2899 SDs, 0 SdLazy, 461 SolverSat, 73 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.4s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 391 GetRequests, 343 SyntacticMatches, 2 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 0.5s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=98occurred in iteration=0, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.1s AutomataMinimizationTime, 4 MinimizatonAttempts, 0 StatesRemovedByMinimization, 0 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.1s SsaConstructionTime, 0.4s SatisfiabilityAnalysisTime, 0.8s InterpolantComputationTime, 336 NumberOfCodeBlocks, 265 NumberOfCodeBlocksAsserted, 15 NumberOfCheckSat, 374 ConstructedInterpolants, 0 QuantifiedInterpolants, 58382 SizeOfPredicates, 23 NumberOfNonLiveVariables, 886 ConjunctsInSsa, 92 ConjunctsInUnsatCore, 6 InterpolantComputations, 2 PerfectInterpolantSequences, 103/111 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...