java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf --traceabstraction.trace.refinement.strategy SIFA_TAIPAN --sifa.abstract.domain CompoundDomain --rcfgbuilder.size.of.a.code.block LoopFreeBlock --sifa.call.summarizer TopInputCallSummarizer --sifa.fluid SizeLimitFluid --sifa.simplification.technique SIMPLIFY_QUICK -i ../../../trunk/examples/svcomp/array-tiling/mbpr3.c -------------------------------------------------------------------------------- This is Ultimate 0.1.24-13a467a-m [2019-10-15 01:37:59,529 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-10-15 01:37:59,532 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-10-15 01:37:59,549 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2019-10-15 01:37:59,549 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2019-10-15 01:37:59,551 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2019-10-15 01:37:59,553 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2019-10-15 01:37:59,562 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2019-10-15 01:37:59,567 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2019-10-15 01:37:59,570 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2019-10-15 01:37:59,572 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2019-10-15 01:37:59,573 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2019-10-15 01:37:59,573 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-10-15 01:37:59,575 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-10-15 01:37:59,577 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-10-15 01:37:59,579 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-10-15 01:37:59,580 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-10-15 01:37:59,581 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-10-15 01:37:59,582 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-10-15 01:37:59,587 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-10-15 01:37:59,592 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-10-15 01:37:59,596 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-10-15 01:37:59,598 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-10-15 01:37:59,599 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-10-15 01:37:59,601 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2019-10-15 01:37:59,610 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-10-15 01:37:59,611 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-10-15 01:37:59,612 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-10-15 01:37:59,613 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 [2019-10-15 01:37:59,634 INFO L113 SettingsManager]: Loading preferences was successful [2019-10-15 01:37:59,635 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-10-15 01:37:59,636 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2019-10-15 01:37:59,640 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2019-10-15 01:37:59,640 INFO L138 SettingsManager]: * Use SBE=true [2019-10-15 01:37:59,641 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-10-15 01:37:59,641 INFO L138 SettingsManager]: * sizeof long=4 [2019-10-15 01:37:59,641 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2019-10-15 01:37:59,641 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-10-15 01:37:59,641 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-10-15 01:37:59,642 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-10-15 01:37:59,642 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-10-15 01:37:59,642 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-10-15 01:37:59,643 INFO L138 SettingsManager]: * sizeof long double=12 [2019-10-15 01:37:59,643 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-10-15 01:37:59,643 INFO L138 SettingsManager]: * Use constant arrays=true [2019-10-15 01:37:59,643 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-10-15 01:37:59,643 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-10-15 01:37:59,644 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-10-15 01:37:59,644 INFO L138 SettingsManager]: * To the following directory=./dump/ [2019-10-15 01:37:59,644 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2019-10-15 01:37:59,644 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-10-15 01:37:59,644 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-10-15 01:37:59,645 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-10-15 01:37:59,645 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-10-15 01:37:59,645 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2019-10-15 01:37:59,647 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-10-15 01:37:59,647 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-10-15 01:37:59,647 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> SIFA_TAIPAN Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.sifa: Abstract Domain -> CompoundDomain Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder: Size of a code block -> LoopFreeBlock Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.sifa: Call Summarizer -> TopInputCallSummarizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.sifa: Fluid -> SizeLimitFluid Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.sifa: Simplification Technique -> SIMPLIFY_QUICK [2019-10-15 01:37:59,913 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-10-15 01:37:59,927 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-10-15 01:37:59,931 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-10-15 01:37:59,932 INFO L271 PluginConnector]: Initializing CDTParser... [2019-10-15 01:37:59,932 INFO L275 PluginConnector]: CDTParser initialized [2019-10-15 01:37:59,934 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/array-tiling/mbpr3.c [2019-10-15 01:38:00,006 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/d80d6806f/bb720ca7c58944d0bc638b34dc31d395/FLAGa1b7caa53 [2019-10-15 01:38:00,454 INFO L306 CDTParser]: Found 1 translation units. [2019-10-15 01:38:00,455 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/array-tiling/mbpr3.c [2019-10-15 01:38:00,464 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/d80d6806f/bb720ca7c58944d0bc638b34dc31d395/FLAGa1b7caa53 [2019-10-15 01:38:00,828 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/d80d6806f/bb720ca7c58944d0bc638b34dc31d395 [2019-10-15 01:38:00,838 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-10-15 01:38:00,839 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2019-10-15 01:38:00,840 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-10-15 01:38:00,840 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-10-15 01:38:00,843 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-10-15 01:38:00,844 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 15.10 01:38:00" (1/1) ... [2019-10-15 01:38:00,846 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@4a108aea and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:38:00, skipping insertion in model container [2019-10-15 01:38:00,846 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 15.10 01:38:00" (1/1) ... [2019-10-15 01:38:00,852 INFO L142 MainTranslator]: Starting translation in SV-COMP mode [2019-10-15 01:38:00,871 INFO L173 MainTranslator]: Built tables and reachable declarations [2019-10-15 01:38:01,063 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-10-15 01:38:01,067 INFO L188 MainTranslator]: Completed pre-run [2019-10-15 01:38:01,097 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-10-15 01:38:01,204 INFO L192 MainTranslator]: Completed translation [2019-10-15 01:38:01,204 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:38:01 WrapperNode [2019-10-15 01:38:01,205 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-10-15 01:38:01,205 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-10-15 01:38:01,205 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-10-15 01:38:01,205 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-10-15 01:38:01,216 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:38:01" (1/1) ... [2019-10-15 01:38:01,216 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:38:01" (1/1) ... [2019-10-15 01:38:01,226 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:38:01" (1/1) ... [2019-10-15 01:38:01,226 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:38:01" (1/1) ... [2019-10-15 01:38:01,237 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:38:01" (1/1) ... [2019-10-15 01:38:01,243 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:38:01" (1/1) ... [2019-10-15 01:38:01,245 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:38:01" (1/1) ... [2019-10-15 01:38:01,248 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-10-15 01:38:01,249 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-10-15 01:38:01,249 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-10-15 01:38:01,249 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-10-15 01:38:01,250 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:38:01" (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 [2019-10-15 01:38:01,312 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2019-10-15 01:38:01,313 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-10-15 01:38:01,313 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2019-10-15 01:38:01,313 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2019-10-15 01:38:01,313 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2019-10-15 01:38:01,313 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assume [2019-10-15 01:38:01,313 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2019-10-15 01:38:01,314 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2019-10-15 01:38:01,314 INFO L130 BoogieDeclarations]: Found specification of procedure main [2019-10-15 01:38:01,314 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2019-10-15 01:38:01,314 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2019-10-15 01:38:01,314 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2019-10-15 01:38:01,315 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2019-10-15 01:38:01,315 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2019-10-15 01:38:01,315 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-10-15 01:38:01,890 INFO L279 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-10-15 01:38:01,891 INFO L284 CfgBuilder]: Removed 4 assume(true) statements. [2019-10-15 01:38:01,894 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 15.10 01:38:01 BoogieIcfgContainer [2019-10-15 01:38:01,895 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-10-15 01:38:01,896 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-10-15 01:38:01,896 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-10-15 01:38:01,900 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-10-15 01:38:01,900 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 15.10 01:38:00" (1/3) ... [2019-10-15 01:38:01,902 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7bad8cd2 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 15.10 01:38:01, skipping insertion in model container [2019-10-15 01:38:01,902 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:38:01" (2/3) ... [2019-10-15 01:38:01,903 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7bad8cd2 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 15.10 01:38:01, skipping insertion in model container [2019-10-15 01:38:01,903 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 15.10 01:38:01" (3/3) ... [2019-10-15 01:38:01,905 INFO L109 eAbstractionObserver]: Analyzing ICFG mbpr3.c [2019-10-15 01:38:01,916 INFO L152 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-10-15 01:38:01,927 INFO L164 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-10-15 01:38:01,939 INFO L249 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-10-15 01:38:01,984 INFO L373 AbstractCegarLoop]: Interprodecural is true [2019-10-15 01:38:01,984 INFO L374 AbstractCegarLoop]: Hoare is true [2019-10-15 01:38:01,984 INFO L375 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-10-15 01:38:01,984 INFO L376 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-10-15 01:38:01,985 INFO L377 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-10-15 01:38:01,985 INFO L378 AbstractCegarLoop]: Difference is false [2019-10-15 01:38:01,985 INFO L379 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-10-15 01:38:01,985 INFO L383 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-10-15 01:38:02,004 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states. [2019-10-15 01:38:02,009 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2019-10-15 01:38:02,010 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:38:02,011 INFO L380 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 01:38:02,012 INFO L410 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:38:02,018 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:38:02,019 INFO L82 PathProgramCache]: Analyzing trace with hash 1766250558, now seen corresponding path program 1 times [2019-10-15 01:38:02,028 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 01:38:02,029 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1688791226] [2019-10-15 01:38:02,029 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:38:02,030 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:38:02,030 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:38:02,157 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:38:02,448 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-15 01:38:02,449 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1688791226] [2019-10-15 01:38:02,451 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-10-15 01:38:02,451 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2019-10-15 01:38:02,452 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1252984510] [2019-10-15 01:38:02,457 INFO L442 AbstractCegarLoop]: Interpolant automaton has 5 states [2019-10-15 01:38:02,457 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 01:38:02,472 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2019-10-15 01:38:02,473 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2019-10-15 01:38:02,476 INFO L87 Difference]: Start difference. First operand 24 states. Second operand 5 states. [2019-10-15 01:38:02,612 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 01:38:02,613 INFO L93 Difference]: Finished difference Result 46 states and 56 transitions. [2019-10-15 01:38:02,614 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2019-10-15 01:38:02,615 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 15 [2019-10-15 01:38:02,616 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 01:38:02,629 INFO L225 Difference]: With dead ends: 46 [2019-10-15 01:38:02,629 INFO L226 Difference]: Without dead ends: 20 [2019-10-15 01:38:02,636 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 2 SyntacticMatches, 1 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2019-10-15 01:38:02,656 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2019-10-15 01:38:02,689 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2019-10-15 01:38:02,690 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2019-10-15 01:38:02,693 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 23 transitions. [2019-10-15 01:38:02,696 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 23 transitions. Word has length 15 [2019-10-15 01:38:02,697 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 01:38:02,697 INFO L462 AbstractCegarLoop]: Abstraction has 20 states and 23 transitions. [2019-10-15 01:38:02,698 INFO L463 AbstractCegarLoop]: Interpolant automaton has 5 states. [2019-10-15 01:38:02,698 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 23 transitions. [2019-10-15 01:38:02,699 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2019-10-15 01:38:02,700 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:38:02,700 INFO L380 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 01:38:02,701 INFO L410 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:38:02,703 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:38:02,703 INFO L82 PathProgramCache]: Analyzing trace with hash 1855375174, now seen corresponding path program 1 times [2019-10-15 01:38:02,703 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 01:38:02,704 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1882121958] [2019-10-15 01:38:02,704 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:38:02,704 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:38:02,704 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:38:02,758 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:38:02,976 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-10-15 01:38:02,976 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1882121958] [2019-10-15 01:38:02,977 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-10-15 01:38:02,977 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2019-10-15 01:38:02,977 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [278486027] [2019-10-15 01:38:02,979 INFO L442 AbstractCegarLoop]: Interpolant automaton has 5 states [2019-10-15 01:38:02,979 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 01:38:02,979 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2019-10-15 01:38:02,980 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2019-10-15 01:38:02,980 INFO L87 Difference]: Start difference. First operand 20 states and 23 transitions. Second operand 5 states. [2019-10-15 01:38:03,038 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 01:38:03,038 INFO L93 Difference]: Finished difference Result 32 states and 38 transitions. [2019-10-15 01:38:03,039 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2019-10-15 01:38:03,039 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 16 [2019-10-15 01:38:03,039 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 01:38:03,040 INFO L225 Difference]: With dead ends: 32 [2019-10-15 01:38:03,040 INFO L226 Difference]: Without dead ends: 22 [2019-10-15 01:38:03,041 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 2 SyntacticMatches, 2 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2019-10-15 01:38:03,042 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2019-10-15 01:38:03,046 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2019-10-15 01:38:03,047 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2019-10-15 01:38:03,048 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 25 transitions. [2019-10-15 01:38:03,048 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 25 transitions. Word has length 16 [2019-10-15 01:38:03,048 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 01:38:03,048 INFO L462 AbstractCegarLoop]: Abstraction has 22 states and 25 transitions. [2019-10-15 01:38:03,049 INFO L463 AbstractCegarLoop]: Interpolant automaton has 5 states. [2019-10-15 01:38:03,049 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 25 transitions. [2019-10-15 01:38:03,049 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2019-10-15 01:38:03,050 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:38:03,050 INFO L380 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 01:38:03,050 INFO L410 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:38:03,050 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:38:03,051 INFO L82 PathProgramCache]: Analyzing trace with hash -1973406544, now seen corresponding path program 1 times [2019-10-15 01:38:03,051 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 01:38:03,051 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1624595368] [2019-10-15 01:38:03,051 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:38:03,052 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:38:03,052 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:38:03,115 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:38:03,743 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-15 01:38:03,743 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1624595368] [2019-10-15 01:38:03,744 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1107390056] [2019-10-15 01:38:03,744 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 01:38:03,828 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:38:03,831 INFO L256 TraceCheckSpWp]: Trace formula consists of 100 conjuncts, 31 conjunts are in the unsatisfiable core [2019-10-15 01:38:03,840 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-15 01:38:03,949 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-15 01:38:04,181 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 01:38:04,182 FATAL L? ?]: The Plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction has thrown an exception: java.lang.AssertionError: java.lang.NullPointerException at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.tryExecuteInterpolantGenerator(TraceAbstractionRefinementEngine.java:307) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.generateProof(TraceAbstractionRefinementEngine.java:184) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.executeStrategy(TraceAbstractionRefinementEngine.java:174) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.RefinementEngineFactory.runRefinementEngine(RefinementEngineFactory.java:124) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterateInternal(AbstractCegarLoop.java:419) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:368) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.iterate(TraceAbstractionStarter.java:332) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:170) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:122) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:120) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:316) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:55) Caused by: java.lang.NullPointerException at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.arrays.MultiDimensionalNestedStore.getInnermost(MultiDimensionalNestedStore.java:121) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.arrays.ArrayOccurrenceAnalysis$ArrOccFinder$MyWalker.walk(ArrayOccurrenceAnalysis.java:277) at de.uni_freiburg.informatik.ultimate.logic.NonRecursive$TermWalker.walk(NonRecursive.java:139) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.arrays.ArrayOccurrenceAnalysis$ArrOccFinder$MyWalker.walk(ArrayOccurrenceAnalysis.java:195) at de.uni_freiburg.informatik.ultimate.logic.NonRecursive.run(NonRecursive.java:115) at de.uni_freiburg.informatik.ultimate.logic.NonRecursive.run(NonRecursive.java:106) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.arrays.ArrayOccurrenceAnalysis$ArrOccFinder.(ArrayOccurrenceAnalysis.java:181) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.arrays.ArrayOccurrenceAnalysis.(ArrayOccurrenceAnalysis.java:83) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.arrays.ArrayOccurrenceAnalysis.downgradeDimensionsIfNecessary(ArrayOccurrenceAnalysis.java:171) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.arrays.ArrayIndexBasedCostEstimation.computeCostEstimation(ArrayIndexBasedCostEstimation.java:132) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.arrays.ArrayIndexBasedCostEstimation.(ArrayIndexBasedCostEstimation.java:64) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.ElimStorePlain.computeCostEstimation(ElimStorePlain.java:519) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.ElimStorePlain.doElimAllRec(ElimStorePlain.java:390) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.ElimStorePlain.startRecursiveElimination(ElimStorePlain.java:216) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.PartialQuantifierElimination.elim(PartialQuantifierElimination.java:306) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.PartialQuantifierElimination.tryToEliminate(PartialQuantifierElimination.java:102) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.predicates.IterativePredicateTransformer$QuantifierEliminationPostprocessor.postprocess(IterativePredicateTransformer.java:245) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.predicates.IterativePredicateTransformer.applyPostprocessors(IterativePredicateTransformer.java:439) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.predicates.IterativePredicateTransformer.computeStrongestPostconditionSequence(IterativePredicateTransformer.java:200) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.singletracecheck.TraceCheckSpWp.computeInterpolantsUsingUnsatCore(TraceCheckSpWp.java:292) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.singletracecheck.TraceCheckSpWp.computeInterpolants(TraceCheckSpWp.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.singletracecheck.TraceCheckSpWp.(TraceCheckSpWp.java:162) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSpWp.construct(IpTcStrategyModuleSpWp.java:108) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSpWp.construct(IpTcStrategyModuleSpWp.java:1) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.tryExecuteInterpolantGenerator(TraceAbstractionRefinementEngine.java:299) ... 21 more [2019-10-15 01:38:04,188 INFO L168 Benchmark]: Toolchain (without parser) took 3347.85 ms. Allocated memory was 147.3 MB in the beginning and 233.3 MB in the end (delta: 86.0 MB). Free memory was 104.0 MB in the beginning and 94.9 MB in the end (delta: 9.1 MB). Peak memory consumption was 95.1 MB. Max. memory is 7.1 GB. [2019-10-15 01:38:04,189 INFO L168 Benchmark]: CDTParser took 0.21 ms. Allocated memory is still 147.3 MB. Free memory was 122.4 MB in the beginning and 122.2 MB in the end (delta: 209.8 kB). Peak memory consumption was 209.8 kB. Max. memory is 7.1 GB. [2019-10-15 01:38:04,190 INFO L168 Benchmark]: CACSL2BoogieTranslator took 364.89 ms. Allocated memory was 147.3 MB in the beginning and 205.5 MB in the end (delta: 58.2 MB). Free memory was 103.8 MB in the beginning and 184.1 MB in the end (delta: -80.3 MB). Peak memory consumption was 20.3 MB. Max. memory is 7.1 GB. [2019-10-15 01:38:04,191 INFO L168 Benchmark]: Boogie Preprocessor took 42.99 ms. Allocated memory is still 205.5 MB. Free memory was 184.1 MB in the beginning and 181.9 MB in the end (delta: 2.3 MB). Peak memory consumption was 2.3 MB. Max. memory is 7.1 GB. [2019-10-15 01:38:04,192 INFO L168 Benchmark]: RCFGBuilder took 646.39 ms. Allocated memory is still 205.5 MB. Free memory was 181.9 MB in the beginning and 148.7 MB in the end (delta: 33.2 MB). Peak memory consumption was 33.2 MB. Max. memory is 7.1 GB. [2019-10-15 01:38:04,193 INFO L168 Benchmark]: TraceAbstraction took 2289.41 ms. Allocated memory was 205.5 MB in the beginning and 233.3 MB in the end (delta: 27.8 MB). Free memory was 148.7 MB in the beginning and 94.9 MB in the end (delta: 53.8 MB). Peak memory consumption was 81.5 MB. Max. memory is 7.1 GB. [2019-10-15 01:38:04,198 INFO L335 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.21 ms. Allocated memory is still 147.3 MB. Free memory was 122.4 MB in the beginning and 122.2 MB in the end (delta: 209.8 kB). Peak memory consumption was 209.8 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 364.89 ms. Allocated memory was 147.3 MB in the beginning and 205.5 MB in the end (delta: 58.2 MB). Free memory was 103.8 MB in the beginning and 184.1 MB in the end (delta: -80.3 MB). Peak memory consumption was 20.3 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 42.99 ms. Allocated memory is still 205.5 MB. Free memory was 184.1 MB in the beginning and 181.9 MB in the end (delta: 2.3 MB). Peak memory consumption was 2.3 MB. Max. memory is 7.1 GB. * RCFGBuilder took 646.39 ms. Allocated memory is still 205.5 MB. Free memory was 181.9 MB in the beginning and 148.7 MB in the end (delta: 33.2 MB). Peak memory consumption was 33.2 MB. Max. memory is 7.1 GB. * TraceAbstraction took 2289.41 ms. Allocated memory was 205.5 MB in the beginning and 233.3 MB in the end (delta: 27.8 MB). Free memory was 148.7 MB in the beginning and 94.9 MB in the end (delta: 53.8 MB). Peak memory consumption was 81.5 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - ExceptionOrErrorResult: AssertionError: java.lang.NullPointerException de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: AssertionError: java.lang.NullPointerException: de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.tryExecuteInterpolantGenerator(TraceAbstractionRefinementEngine.java:307) RESULT: Ultimate could not prove your program: Toolchain returned no result. Received shutdown request...