/usr/bin/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/automizer/acceleratedInterpolation/acceleratedInterpolationFastUPR_32.epf -i ../../../trunk/examples/svcomp/loops/invert_string-1.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-86f66a4 [2020-07-07 13:58:39,910 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-07 13:58:39,912 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-07 13:58:39,925 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-07 13:58:39,925 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-07 13:58:39,926 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-07 13:58:39,927 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-07 13:58:39,929 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-07 13:58:39,931 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-07 13:58:39,932 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-07 13:58:39,933 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-07 13:58:39,934 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-07 13:58:39,935 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-07 13:58:39,936 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-07 13:58:39,937 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-07 13:58:39,938 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-07 13:58:39,939 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-07 13:58:39,940 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-07 13:58:39,942 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-07 13:58:39,943 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-07 13:58:39,945 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-07 13:58:39,946 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-07 13:58:39,947 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-07 13:58:39,948 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-07 13:58:39,950 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-07-07 13:58:39,951 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-07-07 13:58:39,951 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-07-07 13:58:39,952 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-07-07 13:58:39,952 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-07-07 13:58:39,953 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-07-07 13:58:39,953 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-07-07 13:58:39,954 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-07-07 13:58:39,955 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-07-07 13:58:39,956 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-07-07 13:58:39,957 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-07-07 13:58:39,957 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-07-07 13:58:39,957 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-07-07 13:58:39,958 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-07-07 13:58:39,958 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-07 13:58:39,959 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-07 13:58:39,960 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-07 13:58:39,960 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationFastUPR_32.epf [2020-07-07 13:58:39,969 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-07 13:58:39,970 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-07 13:58:39,971 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-07 13:58:39,971 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-07 13:58:39,971 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-07 13:58:39,971 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-07 13:58:39,972 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-07 13:58:39,972 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-07 13:58:39,972 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-07 13:58:39,972 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-07 13:58:39,972 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-07 13:58:39,973 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-07 13:58:39,973 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-07 13:58:39,973 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-07 13:58:39,973 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-07 13:58:39,973 INFO L138 SettingsManager]: * Size of a code block=SingleStatement [2020-07-07 13:58:39,974 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-07 13:58:39,974 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-07 13:58:39,974 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-07 13:58:39,974 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-07 13:58:39,975 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=AcceleratedInterpolation [2020-07-07 13:58:39,975 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-07 13:58:39,975 INFO L138 SettingsManager]: * Use separate solver for trace checks=false [2020-07-07 13:58:40,269 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-07 13:58:40,282 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-07 13:58:40,286 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-07 13:58:40,287 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-07 13:58:40,288 INFO L275 PluginConnector]: CDTParser initialized [2020-07-07 13:58:40,288 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops/invert_string-1.c [2020-07-07 13:58:40,366 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/07576c0da/834033144bcd4a7d9dfb0a6c19b662ee/FLAGd0d6d5906 [2020-07-07 13:58:40,843 INFO L306 CDTParser]: Found 1 translation units. [2020-07-07 13:58:40,843 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loops/invert_string-1.c [2020-07-07 13:58:40,851 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/07576c0da/834033144bcd4a7d9dfb0a6c19b662ee/FLAGd0d6d5906 [2020-07-07 13:58:41,217 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/07576c0da/834033144bcd4a7d9dfb0a6c19b662ee [2020-07-07 13:58:41,229 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-07 13:58:41,231 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-07 13:58:41,232 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-07 13:58:41,233 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-07 13:58:41,237 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-07 13:58:41,238 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.07 01:58:41" (1/1) ... [2020-07-07 13:58:41,241 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@64a75eb4 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.07 01:58:41, skipping insertion in model container [2020-07-07 13:58:41,242 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.07 01:58:41" (1/1) ... [2020-07-07 13:58:41,250 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-07 13:58:41,268 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-07 13:58:41,446 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-07 13:58:41,450 INFO L203 MainTranslator]: Completed pre-run [2020-07-07 13:58:41,475 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-07 13:58:41,495 INFO L208 MainTranslator]: Completed translation [2020-07-07 13:58:41,496 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.07 01:58:41 WrapperNode [2020-07-07 13:58:41,496 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-07 13:58:41,497 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-07 13:58:41,497 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-07 13:58:41,497 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-07 13:58:41,604 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.07 01:58:41" (1/1) ... [2020-07-07 13:58:41,604 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.07 01:58:41" (1/1) ... [2020-07-07 13:58:41,613 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.07 01:58:41" (1/1) ... [2020-07-07 13:58:41,613 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.07 01:58:41" (1/1) ... [2020-07-07 13:58:41,621 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.07 01:58:41" (1/1) ... [2020-07-07 13:58:41,626 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.07 01:58:41" (1/1) ... [2020-07-07 13:58:41,628 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.07 01:58:41" (1/1) ... [2020-07-07 13:58:41,630 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-07 13:58:41,631 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-07 13:58:41,631 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-07 13:58:41,631 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-07 13:58:41,632 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.07 01:58:41" (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 [2020-07-07 13:58:41,701 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-07 13:58:41,701 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-07 13:58:41,701 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-07-07 13:58:41,701 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-07 13:58:41,702 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-07 13:58:41,702 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-07-07 13:58:41,702 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-07-07 13:58:41,702 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_char [2020-07-07 13:58:41,702 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_uint [2020-07-07 13:58:41,702 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-07 13:58:41,703 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-07-07 13:58:41,703 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-07-07 13:58:41,703 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-07-07 13:58:41,703 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-07-07 13:58:41,703 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-07 13:58:41,703 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-07 13:58:42,015 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-07 13:58:42,015 INFO L295 CfgBuilder]: Removed 3 assume(true) statements. [2020-07-07 13:58:42,020 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.07 01:58:42 BoogieIcfgContainer [2020-07-07 13:58:42,020 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-07 13:58:42,022 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-07 13:58:42,022 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-07 13:58:42,026 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-07 13:58:42,026 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 07.07 01:58:41" (1/3) ... [2020-07-07 13:58:42,027 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@521fdf66 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.07 01:58:42, skipping insertion in model container [2020-07-07 13:58:42,027 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.07 01:58:41" (2/3) ... [2020-07-07 13:58:42,028 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@521fdf66 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.07 01:58:42, skipping insertion in model container [2020-07-07 13:58:42,028 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.07 01:58:42" (3/3) ... [2020-07-07 13:58:42,029 INFO L109 eAbstractionObserver]: Analyzing ICFG invert_string-1.c [2020-07-07 13:58:42,040 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:AcceleratedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-07-07 13:58:42,048 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-07 13:58:42,063 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-07 13:58:42,093 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-07 13:58:42,093 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-07 13:58:42,094 INFO L377 AbstractCegarLoop]: Compute interpolants for AcceleratedInterpolation [2020-07-07 13:58:42,094 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-07 13:58:42,094 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-07 13:58:42,094 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-07 13:58:42,094 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-07 13:58:42,094 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-07 13:58:42,113 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states. [2020-07-07 13:58:42,124 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2020-07-07 13:58:42,125 INFO L414 BasicCegarLoop]: Found error trace [2020-07-07 13:58:42,126 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] [2020-07-07 13:58:42,127 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-07 13:58:42,133 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-07 13:58:42,133 INFO L82 PathProgramCache]: Analyzing trace with hash -1584943199, now seen corresponding path program 1 times [2020-07-07 13:58:42,142 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-07 13:58:42,143 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1186807317] [2020-07-07 13:58:42,143 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-07-07 13:58:42,260 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 13:58:42,344 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 13:58:42,357 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-07 13:58:42,357 INFO L185 leratedInterpolation]: Finished Analysing Program using PRECISE loop Acceleration [2020-07-07 13:58:42,360 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1186807317] [2020-07-07 13:58:42,362 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-07 13:58:42,362 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-07 13:58:42,363 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [12369502] [2020-07-07 13:58:42,367 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-07 13:58:42,368 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-07 13:58:42,378 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-07 13:58:42,378 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-07 13:58:42,380 INFO L87 Difference]: Start difference. First operand 66 states. Second operand 3 states. [2020-07-07 13:58:42,566 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-07 13:58:42,566 INFO L93 Difference]: Finished difference Result 121 states and 135 transitions. [2020-07-07 13:58:42,567 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-07 13:58:42,569 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 31 [2020-07-07 13:58:42,569 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-07 13:58:42,579 INFO L225 Difference]: With dead ends: 121 [2020-07-07 13:58:42,579 INFO L226 Difference]: Without dead ends: 57 [2020-07-07 13:58:42,584 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-07 13:58:42,604 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2020-07-07 13:58:42,632 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 57. [2020-07-07 13:58:42,634 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2020-07-07 13:58:42,636 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 59 transitions. [2020-07-07 13:58:42,638 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 59 transitions. Word has length 31 [2020-07-07 13:58:42,638 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-07 13:58:42,638 INFO L479 AbstractCegarLoop]: Abstraction has 57 states and 59 transitions. [2020-07-07 13:58:42,639 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-07 13:58:42,639 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 59 transitions. [2020-07-07 13:58:42,640 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2020-07-07 13:58:42,641 INFO L414 BasicCegarLoop]: Found error trace [2020-07-07 13:58:42,641 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] [2020-07-07 13:58:42,641 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-07-07 13:58:42,642 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-07 13:58:42,642 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-07 13:58:42,643 INFO L82 PathProgramCache]: Analyzing trace with hash -318765620, now seen corresponding path program 1 times [2020-07-07 13:58:42,643 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-07 13:58:42,643 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2024341954] [2020-07-07 13:58:42,644 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-07-07 13:58:42,675 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 13:58:42,784 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 13:58:42,791 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-07 13:58:42,791 INFO L185 leratedInterpolation]: Finished Analysing Program using PRECISE loop Acceleration [2020-07-07 13:58:42,792 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2024341954] [2020-07-07 13:58:42,792 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-07 13:58:42,792 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-07 13:58:42,793 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1120924065] [2020-07-07 13:58:42,794 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-07 13:58:42,794 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-07 13:58:42,794 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-07 13:58:42,795 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2020-07-07 13:58:42,795 INFO L87 Difference]: Start difference. First operand 57 states and 59 transitions. Second operand 5 states. [2020-07-07 13:58:43,023 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-07 13:58:43,024 INFO L93 Difference]: Finished difference Result 107 states and 112 transitions. [2020-07-07 13:58:43,024 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-07 13:58:43,025 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 31 [2020-07-07 13:58:43,025 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-07 13:58:43,028 INFO L225 Difference]: With dead ends: 107 [2020-07-07 13:58:43,029 INFO L226 Difference]: Without dead ends: 74 [2020-07-07 13:58:43,031 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2020-07-07 13:58:43,032 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 74 states. [2020-07-07 13:58:43,050 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 74 to 58. [2020-07-07 13:58:43,051 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 58 states. [2020-07-07 13:58:43,052 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 60 transitions. [2020-07-07 13:58:43,053 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 60 transitions. Word has length 31 [2020-07-07 13:58:43,053 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-07 13:58:43,053 INFO L479 AbstractCegarLoop]: Abstraction has 58 states and 60 transitions. [2020-07-07 13:58:43,054 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-07 13:58:43,054 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 60 transitions. [2020-07-07 13:58:43,055 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2020-07-07 13:58:43,055 INFO L414 BasicCegarLoop]: Found error trace [2020-07-07 13:58:43,055 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] [2020-07-07 13:58:43,056 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-07-07 13:58:43,056 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-07 13:58:43,056 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-07 13:58:43,056 INFO L82 PathProgramCache]: Analyzing trace with hash -1837873718, now seen corresponding path program 1 times [2020-07-07 13:58:43,057 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-07 13:58:43,057 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [168508984] [2020-07-07 13:58:43,057 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-07-07 13:58:43,110 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 13:58:43,182 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 13:58:43,191 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-07 13:58:43,191 INFO L185 leratedInterpolation]: Finished Analysing Program using PRECISE loop Acceleration [2020-07-07 13:58:43,192 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [168508984] [2020-07-07 13:58:43,192 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-07 13:58:43,192 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-07 13:58:43,193 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1187726564] [2020-07-07 13:58:43,193 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-07 13:58:43,193 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-07 13:58:43,194 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-07 13:58:43,194 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-07 13:58:43,195 INFO L87 Difference]: Start difference. First operand 58 states and 60 transitions. Second operand 5 states. [2020-07-07 13:58:43,445 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-07 13:58:43,446 INFO L93 Difference]: Finished difference Result 95 states and 99 transitions. [2020-07-07 13:58:43,447 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-07 13:58:43,448 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 38 [2020-07-07 13:58:43,448 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-07 13:58:43,449 INFO L225 Difference]: With dead ends: 95 [2020-07-07 13:58:43,451 INFO L226 Difference]: Without dead ends: 75 [2020-07-07 13:58:43,452 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2020-07-07 13:58:43,454 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2020-07-07 13:58:43,466 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 59. [2020-07-07 13:58:43,466 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 59 states. [2020-07-07 13:58:43,467 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 61 transitions. [2020-07-07 13:58:43,467 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 61 transitions. Word has length 38 [2020-07-07 13:58:43,468 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-07 13:58:43,468 INFO L479 AbstractCegarLoop]: Abstraction has 59 states and 61 transitions. [2020-07-07 13:58:43,468 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-07 13:58:43,468 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 61 transitions. [2020-07-07 13:58:43,470 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2020-07-07 13:58:43,470 INFO L414 BasicCegarLoop]: Found error trace [2020-07-07 13:58:43,470 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, 1, 1, 1, 1] [2020-07-07 13:58:43,470 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-07-07 13:58:43,470 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-07 13:58:43,471 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-07 13:58:43,471 INFO L82 PathProgramCache]: Analyzing trace with hash -2141827952, now seen corresponding path program 1 times [2020-07-07 13:58:43,471 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-07 13:58:43,472 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [161626483] [2020-07-07 13:58:43,472 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-07-07 13:58:43,479 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-07-07 13:58:43,480 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.AcceleratedInterpolation.generateMetaTrace(AcceleratedInterpolation.java:442) at de.uni_freiburg.informatik.ultimate.lib.acceleratedinterpolation.AcceleratedInterpolation.acceleratedInterpolationCore(AcceleratedInterpolation.java:277) at de.uni_freiburg.informatik.ultimate.lib.acceleratedinterpolation.AcceleratedInterpolation.(AcceleratedInterpolation.java:184) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModulePreferences.construct(IpTcStrategyModulePreferences.java:144) 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.isCorrect(IpTcStrategyModuleBase.java:57) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.checkFeasibility(AutomatonFreeRefinementEngine.java:242) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:166) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:75) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:508) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterateInternal(AbstractCegarLoop.java:436) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:370) 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:334) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:127) 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:317) 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) [2020-07-07 13:58:43,486 INFO L168 Benchmark]: Toolchain (without parser) took 2254.23 ms. Allocated memory was 141.0 MB in the beginning and 226.0 MB in the end (delta: 84.9 MB). Free memory was 100.1 MB in the beginning and 172.7 MB in the end (delta: -72.6 MB). Peak memory consumption was 12.3 MB. Max. memory is 7.1 GB. [2020-07-07 13:58:43,487 INFO L168 Benchmark]: CDTParser took 0.18 ms. Allocated memory is still 141.0 MB. Free memory was 118.3 MB in the beginning and 118.1 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. [2020-07-07 13:58:43,488 INFO L168 Benchmark]: CACSL2BoogieTranslator took 264.18 ms. Allocated memory is still 141.0 MB. Free memory was 99.9 MB in the beginning and 89.3 MB in the end (delta: 10.6 MB). Peak memory consumption was 10.6 MB. Max. memory is 7.1 GB. [2020-07-07 13:58:43,489 INFO L168 Benchmark]: Boogie Preprocessor took 133.27 ms. Allocated memory was 141.0 MB in the beginning and 199.2 MB in the end (delta: 58.2 MB). Free memory was 89.3 MB in the beginning and 176.6 MB in the end (delta: -87.3 MB). Peak memory consumption was 9.6 MB. Max. memory is 7.1 GB. [2020-07-07 13:58:43,490 INFO L168 Benchmark]: RCFGBuilder took 389.50 ms. Allocated memory is still 199.2 MB. Free memory was 176.6 MB in the beginning and 157.5 MB in the end (delta: 19.1 MB). Peak memory consumption was 19.1 MB. Max. memory is 7.1 GB. [2020-07-07 13:58:43,491 INFO L168 Benchmark]: TraceAbstraction took 1460.93 ms. Allocated memory was 199.2 MB in the beginning and 226.0 MB in the end (delta: 26.7 MB). Free memory was 156.8 MB in the beginning and 172.7 MB in the end (delta: -15.9 MB). Peak memory consumption was 10.8 MB. Max. memory is 7.1 GB. [2020-07-07 13:58:43,496 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.18 ms. Allocated memory is still 141.0 MB. Free memory was 118.3 MB in the beginning and 118.1 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 264.18 ms. Allocated memory is still 141.0 MB. Free memory was 99.9 MB in the beginning and 89.3 MB in the end (delta: 10.6 MB). Peak memory consumption was 10.6 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 133.27 ms. Allocated memory was 141.0 MB in the beginning and 199.2 MB in the end (delta: 58.2 MB). Free memory was 89.3 MB in the beginning and 176.6 MB in the end (delta: -87.3 MB). Peak memory consumption was 9.6 MB. Max. memory is 7.1 GB. * RCFGBuilder took 389.50 ms. Allocated memory is still 199.2 MB. Free memory was 176.6 MB in the beginning and 157.5 MB in the end (delta: 19.1 MB). Peak memory consumption was 19.1 MB. Max. memory is 7.1 GB. * TraceAbstraction took 1460.93 ms. Allocated memory was 199.2 MB in the beginning and 226.0 MB in the end (delta: 26.7 MB). Free memory was 156.8 MB in the beginning and 172.7 MB in the end (delta: -15.9 MB). Peak memory consumption was 10.8 MB. Max. memory is 7.1 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.AcceleratedInterpolation.generateMetaTrace(AcceleratedInterpolation.java:442) RESULT: Ultimate could not prove your program: Toolchain returned no result. Received shutdown request...