/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml -s ../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationFastUPR_32.epf -i ../../../trunk/examples/svcomp/recursive/Ackermann02.c -------------------------------------------------------------------------------- This is Ultimate 0.2.0-b8ad66e [2020-10-23 20:25:59,097 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-10-23 20:25:59,100 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-10-23 20:25:59,152 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2020-10-23 20:25:59,178 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-10-23 20:25:59,181 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-10-23 20:25:59,183 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-10-23 20:25:59,184 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-10-23 20:25:59,185 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-10-23 20:25:59,188 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-10-23 20:25:59,194 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-10-23 20:25:59,202 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-10-23 20:25:59,204 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-10-23 20:25:59,205 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-10-23 20:25:59,206 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-10-23 20:25:59,209 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-10-23 20:25:59,216 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-10-23 20:25:59,235 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-10-23 20:25:59,236 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-10-23 20:25:59,237 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-10-23 20:25:59,238 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationFastUPR_32.epf [2020-10-23 20:25:59,264 INFO L113 SettingsManager]: Loading preferences was successful [2020-10-23 20:25:59,264 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-10-23 20:25:59,269 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-10-23 20:25:59,269 INFO L138 SettingsManager]: * sizeof long=4 [2020-10-23 20:25:59,269 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-10-23 20:25:59,269 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-10-23 20:25:59,270 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-10-23 20:25:59,270 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-10-23 20:25:59,270 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-10-23 20:25:59,270 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-10-23 20:25:59,271 INFO L138 SettingsManager]: * sizeof long double=12 [2020-10-23 20:25:59,272 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-10-23 20:25:59,272 INFO L138 SettingsManager]: * Use constant arrays=true [2020-10-23 20:25:59,272 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-10-23 20:25:59,272 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-10-23 20:25:59,273 INFO L138 SettingsManager]: * Size of a code block=SingleStatement [2020-10-23 20:25:59,273 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-10-23 20:25:59,273 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-10-23 20:25:59,273 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-10-23 20:25:59,273 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-10-23 20:25:59,274 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=AcceleratedInterpolation [2020-10-23 20:25:59,274 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-10-23 20:25:59,274 INFO L138 SettingsManager]: * Use separate solver for trace checks=false WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release [2020-10-23 20:25:59,668 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-10-23 20:25:59,695 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-10-23 20:25:59,698 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-10-23 20:25:59,700 INFO L271 PluginConnector]: Initializing CDTParser... [2020-10-23 20:25:59,700 INFO L275 PluginConnector]: CDTParser initialized [2020-10-23 20:25:59,701 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive/Ackermann02.c [2020-10-23 20:25:59,788 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/16d07c061/6a784d47286f41a0b958012237b049cf/FLAG024030f24 [2020-10-23 20:26:00,372 INFO L306 CDTParser]: Found 1 translation units. [2020-10-23 20:26:00,373 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/recursive/Ackermann02.c [2020-10-23 20:26:00,380 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/16d07c061/6a784d47286f41a0b958012237b049cf/FLAG024030f24 [2020-10-23 20:26:00,751 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/16d07c061/6a784d47286f41a0b958012237b049cf [2020-10-23 20:26:00,754 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-10-23 20:26:00,761 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-10-23 20:26:00,763 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-10-23 20:26:00,763 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-10-23 20:26:00,767 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-10-23 20:26:00,768 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.10 08:26:00" (1/1) ... [2020-10-23 20:26:00,771 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@18f687c2 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 08:26:00, skipping insertion in model container [2020-10-23 20:26:00,772 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.10 08:26:00" (1/1) ... [2020-10-23 20:26:00,780 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-10-23 20:26:00,794 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-10-23 20:26:00,955 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-10-23 20:26:00,965 INFO L203 MainTranslator]: Completed pre-run [2020-10-23 20:26:00,983 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-10-23 20:26:00,996 INFO L208 MainTranslator]: Completed translation [2020-10-23 20:26:00,996 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 08:26:00 WrapperNode [2020-10-23 20:26:00,996 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-10-23 20:26:00,998 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-10-23 20:26:00,998 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-10-23 20:26:00,998 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-10-23 20:26:01,010 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 08:26:00" (1/1) ... [2020-10-23 20:26:01,011 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 08:26:00" (1/1) ... [2020-10-23 20:26:01,017 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 08:26:00" (1/1) ... [2020-10-23 20:26:01,017 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 08:26:00" (1/1) ... [2020-10-23 20:26:01,022 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 08:26:00" (1/1) ... [2020-10-23 20:26:01,024 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 08:26:00" (1/1) ... [2020-10-23 20:26:01,026 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 08:26:00" (1/1) ... [2020-10-23 20:26:01,028 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-10-23 20:26:01,029 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-10-23 20:26:01,029 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-10-23 20:26:01,029 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-10-23 20:26:01,030 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 08:26:00" (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 [2020-10-23 20:26:01,110 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-10-23 20:26:01,110 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-10-23 20:26:01,111 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2020-10-23 20:26:01,111 INFO L138 BoogieDeclarations]: Found implementation of procedure ackermann [2020-10-23 20:26:01,111 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-10-23 20:26:01,112 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-10-23 20:26:01,112 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2020-10-23 20:26:01,112 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2020-10-23 20:26:01,112 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-10-23 20:26:01,113 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-10-23 20:26:01,113 INFO L130 BoogieDeclarations]: Found specification of procedure ackermann [2020-10-23 20:26:01,113 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-10-23 20:26:01,113 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-10-23 20:26:01,114 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2020-10-23 20:26:01,114 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-10-23 20:26:01,114 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-10-23 20:26:01,115 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-10-23 20:26:01,115 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-10-23 20:26:01,405 INFO L293 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-10-23 20:26:01,405 INFO L298 CfgBuilder]: Removed 0 assume(true) statements. [2020-10-23 20:26:01,407 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.10 08:26:01 BoogieIcfgContainer [2020-10-23 20:26:01,407 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-10-23 20:26:01,409 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-10-23 20:26:01,409 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-10-23 20:26:01,413 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-10-23 20:26:01,413 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.10 08:26:00" (1/3) ... [2020-10-23 20:26:01,414 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@ab43348 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.10 08:26:01, skipping insertion in model container [2020-10-23 20:26:01,414 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 08:26:00" (2/3) ... [2020-10-23 20:26:01,414 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@ab43348 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.10 08:26:01, skipping insertion in model container [2020-10-23 20:26:01,415 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.10 08:26:01" (3/3) ... [2020-10-23 20:26:01,416 INFO L111 eAbstractionObserver]: Analyzing ICFG Ackermann02.c [2020-10-23 20:26:01,444 INFO L164 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:AcceleratedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-10-23 20:26:01,453 INFO L176 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-10-23 20:26:01,473 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-10-23 20:26:01,500 INFO L377 AbstractCegarLoop]: Interprodecural is true [2020-10-23 20:26:01,500 INFO L378 AbstractCegarLoop]: Hoare is true [2020-10-23 20:26:01,500 INFO L379 AbstractCegarLoop]: Compute interpolants for AcceleratedInterpolation [2020-10-23 20:26:01,500 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-10-23 20:26:01,501 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-10-23 20:26:01,501 INFO L382 AbstractCegarLoop]: Difference is false [2020-10-23 20:26:01,501 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-10-23 20:26:01,501 INFO L387 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-10-23 20:26:01,521 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states. [2020-10-23 20:26:01,532 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2020-10-23 20:26:01,532 INFO L414 BasicCegarLoop]: Found error trace [2020-10-23 20:26:01,533 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-23 20:26:01,533 INFO L429 AbstractCegarLoop]: === Iteration 1 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-23 20:26:01,539 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-23 20:26:01,540 INFO L82 PathProgramCache]: Analyzing trace with hash -946996355, now seen corresponding path program 1 times [2020-10-23 20:26:01,549 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-23 20:26:01,550 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1003347234] [2020-10-23 20:26:01,550 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-23 20:26:01,628 INFO L321 leratedInterpolation]: No loops in this trace, falling back to nested interpolation [2020-10-23 20:26:01,713 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 20:26:01,860 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-23 20:26:01,868 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 20:26:01,884 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 20 [2020-10-23 20:26:01,892 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 20:26:01,931 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-23 20:26:01,933 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1003347234] [2020-10-23 20:26:01,935 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-10-23 20:26:01,936 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2020-10-23 20:26:01,936 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1617603453] [2020-10-23 20:26:01,941 INFO L461 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-10-23 20:26:01,941 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-23 20:26:01,956 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-10-23 20:26:01,956 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2020-10-23 20:26:01,959 INFO L87 Difference]: Start difference. First operand 56 states. Second operand 6 states. [2020-10-23 20:26:02,435 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-23 20:26:02,435 INFO L93 Difference]: Finished difference Result 101 states and 124 transitions. [2020-10-23 20:26:02,436 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-10-23 20:26:02,437 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 33 [2020-10-23 20:26:02,438 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-23 20:26:02,448 INFO L225 Difference]: With dead ends: 101 [2020-10-23 20:26:02,449 INFO L226 Difference]: Without dead ends: 54 [2020-10-23 20:26:02,453 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=23, Invalid=49, Unknown=0, NotChecked=0, Total=72 [2020-10-23 20:26:02,471 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2020-10-23 20:26:02,507 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 54. [2020-10-23 20:26:02,508 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 54 states. [2020-10-23 20:26:02,510 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 61 transitions. [2020-10-23 20:26:02,512 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 61 transitions. Word has length 33 [2020-10-23 20:26:02,513 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-23 20:26:02,513 INFO L481 AbstractCegarLoop]: Abstraction has 54 states and 61 transitions. [2020-10-23 20:26:02,513 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-10-23 20:26:02,513 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 61 transitions. [2020-10-23 20:26:02,516 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2020-10-23 20:26:02,517 INFO L414 BasicCegarLoop]: Found error trace [2020-10-23 20:26:02,517 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-23 20:26:02,517 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-10-23 20:26:02,518 INFO L429 AbstractCegarLoop]: === Iteration 2 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-23 20:26:02,518 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-23 20:26:02,519 INFO L82 PathProgramCache]: Analyzing trace with hash 300807360, now seen corresponding path program 1 times [2020-10-23 20:26:02,519 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-23 20:26:02,519 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [217292040] [2020-10-23 20:26:02,520 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-23 20:26:02,524 INFO L321 leratedInterpolation]: No loops in this trace, falling back to nested interpolation [2020-10-23 20:26:02,563 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 20:26:02,647 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-23 20:26:02,651 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 20:26:02,660 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 20 [2020-10-23 20:26:02,666 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 20:26:02,695 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 4 [2020-10-23 20:26:02,699 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 20:26:02,718 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2020-10-23 20:26:02,719 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [217292040] [2020-10-23 20:26:02,719 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-10-23 20:26:02,719 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2020-10-23 20:26:02,720 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [647731172] [2020-10-23 20:26:02,721 INFO L461 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-10-23 20:26:02,721 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-23 20:26:02,722 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-10-23 20:26:02,722 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2020-10-23 20:26:02,722 INFO L87 Difference]: Start difference. First operand 54 states and 61 transitions. Second operand 7 states. [2020-10-23 20:26:03,202 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-23 20:26:03,202 INFO L93 Difference]: Finished difference Result 78 states and 95 transitions. [2020-10-23 20:26:03,202 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-10-23 20:26:03,203 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 43 [2020-10-23 20:26:03,203 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-23 20:26:03,209 INFO L225 Difference]: With dead ends: 78 [2020-10-23 20:26:03,209 INFO L226 Difference]: Without dead ends: 71 [2020-10-23 20:26:03,211 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=40, Invalid=92, Unknown=0, NotChecked=0, Total=132 [2020-10-23 20:26:03,211 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 71 states. [2020-10-23 20:26:03,233 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 71 to 71. [2020-10-23 20:26:03,233 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 71 states. [2020-10-23 20:26:03,235 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 88 transitions. [2020-10-23 20:26:03,236 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 88 transitions. Word has length 43 [2020-10-23 20:26:03,236 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-23 20:26:03,236 INFO L481 AbstractCegarLoop]: Abstraction has 71 states and 88 transitions. [2020-10-23 20:26:03,236 INFO L482 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-10-23 20:26:03,237 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 88 transitions. [2020-10-23 20:26:03,239 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2020-10-23 20:26:03,239 INFO L414 BasicCegarLoop]: Found error trace [2020-10-23 20:26:03,240 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-23 20:26:03,240 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-10-23 20:26:03,240 INFO L429 AbstractCegarLoop]: === Iteration 3 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-23 20:26:03,241 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-23 20:26:03,241 INFO L82 PathProgramCache]: Analyzing trace with hash 167896605, now seen corresponding path program 2 times [2020-10-23 20:26:03,241 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-23 20:26:03,242 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1430993199] [2020-10-23 20:26:03,242 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-23 20:26:03,245 INFO L321 leratedInterpolation]: No loops in this trace, falling back to nested interpolation [2020-10-23 20:26:03,263 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 20:26:03,315 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-23 20:26:03,320 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 20:26:03,351 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 20 [2020-10-23 20:26:03,364 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 20:26:03,380 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 4 [2020-10-23 20:26:03,386 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 20:26:03,410 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 4 [2020-10-23 20:26:03,412 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 20:26:03,421 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 3 proven. 1 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2020-10-23 20:26:03,422 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1430993199] [2020-10-23 20:26:03,422 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-10-23 20:26:03,423 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-10-23 20:26:03,423 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1132715027] [2020-10-23 20:26:03,424 INFO L461 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-10-23 20:26:03,424 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-23 20:26:03,424 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-10-23 20:26:03,425 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-10-23 20:26:03,425 INFO L87 Difference]: Start difference. First operand 71 states and 88 transitions. Second operand 5 states. [2020-10-23 20:26:03,636 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-23 20:26:03,636 INFO L93 Difference]: Finished difference Result 125 states and 184 transitions. [2020-10-23 20:26:03,636 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-10-23 20:26:03,637 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 53 [2020-10-23 20:26:03,637 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-23 20:26:03,640 INFO L225 Difference]: With dead ends: 125 [2020-10-23 20:26:03,640 INFO L226 Difference]: Without dead ends: 75 [2020-10-23 20:26:03,643 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 12 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2020-10-23 20:26:03,643 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2020-10-23 20:26:03,664 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 75. [2020-10-23 20:26:03,664 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 75 states. [2020-10-23 20:26:03,666 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 98 transitions. [2020-10-23 20:26:03,666 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 98 transitions. Word has length 53 [2020-10-23 20:26:03,666 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-23 20:26:03,667 INFO L481 AbstractCegarLoop]: Abstraction has 75 states and 98 transitions. [2020-10-23 20:26:03,667 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-10-23 20:26:03,667 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 98 transitions. [2020-10-23 20:26:03,669 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 73 [2020-10-23 20:26:03,669 INFO L414 BasicCegarLoop]: Found error trace [2020-10-23 20:26:03,670 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 5, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-23 20:26:03,670 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-10-23 20:26:03,670 INFO L429 AbstractCegarLoop]: === Iteration 4 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-23 20:26:03,670 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-23 20:26:03,671 INFO L82 PathProgramCache]: Analyzing trace with hash -1842837274, now seen corresponding path program 1 times [2020-10-23 20:26:03,671 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-23 20:26:03,671 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1719156383] [2020-10-23 20:26:03,671 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-23 20:26:03,674 FATAL L? ?]: The Plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction has thrown an exception: java.lang.NullPointerException at de.uni_freiburg.informatik.ultimate.lib.acceleratedinterpolation.looppreprocessor.LoopPreprocessorFastUPR.preProcessLoop(LoopPreprocessorFastUPR.java:119) at de.uni_freiburg.informatik.ultimate.lib.acceleratedinterpolation.AcceleratedInterpolation.acceleratedInterpolationCore(AcceleratedInterpolation.java:266) at de.uni_freiburg.informatik.ultimate.lib.acceleratedinterpolation.AcceleratedInterpolation.(AcceleratedInterpolation.java:227) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModulePreferences.construct(IpTcStrategyModulePreferences.java:147) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.isCorrect(IpTcStrategyModuleBase.java:56) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.checkFeasibility(AutomatonFreeRefinementEngine.java:241) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:165) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:84) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:74) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:511) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterateInternal(AbstractCegarLoop.java:438) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:372) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopResult.iterate(CegarLoopResult.java:142) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.iterateNew(TraceAbstractionStarter.java:341) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:182) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:134) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) 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:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2020-10-23 20:26:03,682 INFO L168 Benchmark]: Toolchain (without parser) took 2924.35 ms. Allocated memory was 151.0 MB in the beginning and 181.4 MB in the end (delta: 30.4 MB). Free memory was 128.1 MB in the beginning and 117.3 MB in the end (delta: 10.7 MB). Peak memory consumption was 42.1 MB. Max. memory is 8.0 GB. [2020-10-23 20:26:03,683 INFO L168 Benchmark]: CDTParser took 0.19 ms. Allocated memory is still 125.8 MB. Free memory was 102.5 MB in the beginning and 102.5 MB in the end (delta: 66.8 kB). There was no memory consumed. Max. memory is 8.0 GB. [2020-10-23 20:26:03,683 INFO L168 Benchmark]: CACSL2BoogieTranslator took 233.87 ms. Allocated memory is still 151.0 MB. Free memory was 127.5 MB in the beginning and 118.2 MB in the end (delta: 9.3 MB). Peak memory consumption was 9.4 MB. Max. memory is 8.0 GB. [2020-10-23 20:26:03,684 INFO L168 Benchmark]: Boogie Preprocessor took 30.40 ms. Allocated memory is still 151.0 MB. Free memory was 118.2 MB in the beginning and 116.8 MB in the end (delta: 1.3 MB). Peak memory consumption was 2.1 MB. Max. memory is 8.0 GB. [2020-10-23 20:26:03,685 INFO L168 Benchmark]: RCFGBuilder took 378.49 ms. Allocated memory is still 151.0 MB. Free memory was 116.8 MB in the beginning and 131.8 MB in the end (delta: -15.0 MB). Peak memory consumption was 16.2 MB. Max. memory is 8.0 GB. [2020-10-23 20:26:03,687 INFO L168 Benchmark]: TraceAbstraction took 2269.65 ms. Allocated memory was 151.0 MB in the beginning and 181.4 MB in the end (delta: 30.4 MB). Free memory was 131.4 MB in the beginning and 117.3 MB in the end (delta: 14.1 MB). Peak memory consumption was 44.8 MB. Max. memory is 8.0 GB. [2020-10-23 20:26:03,691 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.19 ms. Allocated memory is still 125.8 MB. Free memory was 102.5 MB in the beginning and 102.5 MB in the end (delta: 66.8 kB). There was no memory consumed. Max. memory is 8.0 GB. * CACSL2BoogieTranslator took 233.87 ms. Allocated memory is still 151.0 MB. Free memory was 127.5 MB in the beginning and 118.2 MB in the end (delta: 9.3 MB). Peak memory consumption was 9.4 MB. Max. memory is 8.0 GB. * Boogie Preprocessor took 30.40 ms. Allocated memory is still 151.0 MB. Free memory was 118.2 MB in the beginning and 116.8 MB in the end (delta: 1.3 MB). Peak memory consumption was 2.1 MB. Max. memory is 8.0 GB. * RCFGBuilder took 378.49 ms. Allocated memory is still 151.0 MB. Free memory was 116.8 MB in the beginning and 131.8 MB in the end (delta: -15.0 MB). Peak memory consumption was 16.2 MB. Max. memory is 8.0 GB. * TraceAbstraction took 2269.65 ms. Allocated memory was 151.0 MB in the beginning and 181.4 MB in the end (delta: 30.4 MB). Free memory was 131.4 MB in the beginning and 117.3 MB in the end (delta: 14.1 MB). Peak memory consumption was 44.8 MB. Max. memory is 8.0 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - ExceptionOrErrorResult: NullPointerException: null de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: NullPointerException: null: de.uni_freiburg.informatik.ultimate.lib.acceleratedinterpolation.looppreprocessor.LoopPreprocessorFastUPR.preProcessLoop(LoopPreprocessorFastUPR.java:119) RESULT: Ultimate could not prove your program: Toolchain returned no result. Received shutdown request...