/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/acceleratedInterpolationWernerOverapprox_32.epf -i ../../../trunk/examples/svcomp/loops-crafted-1/sumt4.c -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-b7b32d2 [2021-02-22 02:24:37,711 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-02-22 02:24:37,714 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-02-22 02:24:37,761 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-02-22 02:24:37,762 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-02-22 02:24:37,766 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-02-22 02:24:37,770 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-02-22 02:24:37,777 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-02-22 02:24:37,780 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-02-22 02:24:37,786 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-02-22 02:24:37,787 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-02-22 02:24:37,789 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-02-22 02:24:37,789 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-02-22 02:24:37,792 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-02-22 02:24:37,793 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-02-22 02:24:37,795 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-02-22 02:24:37,799 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-02-22 02:24:37,801 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-02-22 02:24:37,809 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-02-22 02:24:37,813 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-02-22 02:24:37,818 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-02-22 02:24:37,820 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-02-22 02:24:37,821 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-02-22 02:24:37,846 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-02-22 02:24:37,852 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-02-22 02:24:37,853 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-02-22 02:24:37,857 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-02-22 02:24:37,859 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-02-22 02:24:37,860 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-02-22 02:24:37,861 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-02-22 02:24:37,861 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-02-22 02:24:37,862 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-02-22 02:24:37,864 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-02-22 02:24:37,865 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-02-22 02:24:37,866 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-02-22 02:24:37,866 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-02-22 02:24:37,867 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-02-22 02:24:37,867 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-02-22 02:24:37,868 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-02-22 02:24:37,869 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-02-22 02:24:37,869 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-02-22 02:24:37,870 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationWernerOverapprox_32.epf [2021-02-22 02:24:37,891 INFO L113 SettingsManager]: Loading preferences was successful [2021-02-22 02:24:37,891 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-02-22 02:24:37,893 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-02-22 02:24:37,893 INFO L138 SettingsManager]: * sizeof long=4 [2021-02-22 02:24:37,893 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-02-22 02:24:37,893 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-02-22 02:24:37,894 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-02-22 02:24:37,894 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-02-22 02:24:37,894 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-02-22 02:24:37,894 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-02-22 02:24:37,895 INFO L138 SettingsManager]: * sizeof long double=12 [2021-02-22 02:24:37,895 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-02-22 02:24:37,895 INFO L138 SettingsManager]: * Use constant arrays=true [2021-02-22 02:24:37,895 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-02-22 02:24:37,895 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-02-22 02:24:37,896 INFO L138 SettingsManager]: * Size of a code block=SingleStatement [2021-02-22 02:24:37,896 INFO L138 SettingsManager]: * To the following directory=./dump/ [2021-02-22 02:24:37,896 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-02-22 02:24:37,896 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-02-22 02:24:37,897 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-02-22 02:24:37,897 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=AcceleratedInterpolation [2021-02-22 02:24:37,897 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-02-22 02:24:37,897 INFO L138 SettingsManager]: * Loop acceleration method that is used by accelerated interpolation=WERNER_OVERAPPROX [2021-02-22 02:24:37,898 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release [2021-02-22 02:24:38,268 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-02-22 02:24:38,297 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-02-22 02:24:38,301 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-02-22 02:24:38,302 INFO L271 PluginConnector]: Initializing CDTParser... [2021-02-22 02:24:38,303 INFO L275 PluginConnector]: CDTParser initialized [2021-02-22 02:24:38,304 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops-crafted-1/sumt4.c [2021-02-22 02:24:38,391 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/a550ec809/1fe811cc07784c85b0f0a745e1d8b89a/FLAG5b9b4fe30 [2021-02-22 02:24:39,016 INFO L306 CDTParser]: Found 1 translation units. [2021-02-22 02:24:39,017 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loops-crafted-1/sumt4.c [2021-02-22 02:24:39,024 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/a550ec809/1fe811cc07784c85b0f0a745e1d8b89a/FLAG5b9b4fe30 [2021-02-22 02:24:39,409 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/a550ec809/1fe811cc07784c85b0f0a745e1d8b89a [2021-02-22 02:24:39,414 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-02-22 02:24:39,431 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2021-02-22 02:24:39,437 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-02-22 02:24:39,438 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-02-22 02:24:39,442 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-02-22 02:24:39,443 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.02 02:24:39" (1/1) ... [2021-02-22 02:24:39,445 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@5bee17d5 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.02 02:24:39, skipping insertion in model container [2021-02-22 02:24:39,445 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.02 02:24:39" (1/1) ... [2021-02-22 02:24:39,456 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-02-22 02:24:39,478 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-02-22 02:24:39,724 WARN L226 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/loops-crafted-1/sumt4.c[403,416] [2021-02-22 02:24:39,742 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-02-22 02:24:39,753 INFO L203 MainTranslator]: Completed pre-run [2021-02-22 02:24:39,768 WARN L226 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/loops-crafted-1/sumt4.c[403,416] [2021-02-22 02:24:39,775 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-02-22 02:24:39,796 INFO L208 MainTranslator]: Completed translation [2021-02-22 02:24:39,796 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.02 02:24:39 WrapperNode [2021-02-22 02:24:39,797 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-02-22 02:24:39,798 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-02-22 02:24:39,798 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-02-22 02:24:39,798 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-02-22 02:24:39,814 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.02 02:24:39" (1/1) ... [2021-02-22 02:24:39,814 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.02 02:24:39" (1/1) ... [2021-02-22 02:24:39,823 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.02 02:24:39" (1/1) ... [2021-02-22 02:24:39,823 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.02 02:24:39" (1/1) ... [2021-02-22 02:24:39,830 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.02 02:24:39" (1/1) ... [2021-02-22 02:24:39,835 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.02 02:24:39" (1/1) ... [2021-02-22 02:24:39,837 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.02 02:24:39" (1/1) ... [2021-02-22 02:24:39,840 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-02-22 02:24:39,841 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-02-22 02:24:39,841 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-02-22 02:24:39,841 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-02-22 02:24:39,842 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.02 02:24:39" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-02-22 02:24:39,954 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-02-22 02:24:39,955 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-02-22 02:24:39,955 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2021-02-22 02:24:39,956 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2021-02-22 02:24:39,956 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-02-22 02:24:39,956 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-02-22 02:24:39,957 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2021-02-22 02:24:39,958 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2021-02-22 02:24:39,958 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2021-02-22 02:24:39,959 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-02-22 02:24:39,959 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2021-02-22 02:24:39,960 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-02-22 02:24:39,960 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_uint [2021-02-22 02:24:39,960 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-02-22 02:24:39,961 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-02-22 02:24:39,961 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-02-22 02:24:39,961 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-02-22 02:24:39,963 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-02-22 02:24:39,963 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-02-22 02:24:39,964 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-02-22 02:24:40,433 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-02-22 02:24:40,435 INFO L299 CfgBuilder]: Removed 1 assume(true) statements. [2021-02-22 02:24:40,438 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.02 02:24:40 BoogieIcfgContainer [2021-02-22 02:24:40,438 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-02-22 02:24:40,443 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-02-22 02:24:40,443 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-02-22 02:24:40,448 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-02-22 02:24:40,449 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 22.02 02:24:39" (1/3) ... [2021-02-22 02:24:40,450 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@37bbaa56 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.02 02:24:40, skipping insertion in model container [2021-02-22 02:24:40,451 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.02 02:24:39" (2/3) ... [2021-02-22 02:24:40,452 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@37bbaa56 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.02 02:24:40, skipping insertion in model container [2021-02-22 02:24:40,452 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.02 02:24:40" (3/3) ... [2021-02-22 02:24:40,454 INFO L111 eAbstractionObserver]: Analyzing ICFG sumt4.c [2021-02-22 02:24:40,463 INFO L153 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:AcceleratedInterpolation Determinization: PREDICATE_ABSTRACTION [2021-02-22 02:24:40,468 INFO L165 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-02-22 02:24:40,491 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-02-22 02:24:40,530 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-02-22 02:24:40,531 INFO L377 AbstractCegarLoop]: Hoare is true [2021-02-22 02:24:40,531 INFO L378 AbstractCegarLoop]: Compute interpolants for AcceleratedInterpolation [2021-02-22 02:24:40,531 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-02-22 02:24:40,531 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-02-22 02:24:40,531 INFO L381 AbstractCegarLoop]: Difference is false [2021-02-22 02:24:40,532 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-02-22 02:24:40,532 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-02-22 02:24:40,554 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states. [2021-02-22 02:24:40,567 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2021-02-22 02:24:40,567 INFO L414 BasicCegarLoop]: Found error trace [2021-02-22 02:24:40,568 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] [2021-02-22 02:24:40,569 INFO L428 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-02-22 02:24:40,577 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-02-22 02:24:40,578 INFO L82 PathProgramCache]: Analyzing trace with hash -2008420778, now seen corresponding path program 1 times [2021-02-22 02:24:40,588 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-02-22 02:24:40,590 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1990489907] [2021-02-22 02:24:40,591 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-02-22 02:24:40,673 INFO L218 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-02-22 02:24:40,743 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-22 02:24:40,809 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-22 02:24:40,811 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-02-22 02:24:40,813 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-22 02:24:40,814 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-02-22 02:24:40,888 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-02-22 02:24:40,895 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-22 02:24:40,913 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-22 02:24:40,914 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-02-22 02:24:40,923 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-02-22 02:24:40,926 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1990489907] [2021-02-22 02:24:40,928 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-02-22 02:24:40,928 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-02-22 02:24:40,929 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [510346019] [2021-02-22 02:24:40,934 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-02-22 02:24:40,935 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-02-22 02:24:40,958 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-02-22 02:24:40,959 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-02-22 02:24:40,963 INFO L87 Difference]: Start difference. First operand 45 states. Second operand 3 states. [2021-02-22 02:24:41,163 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-02-22 02:24:41,164 INFO L93 Difference]: Finished difference Result 57 states and 64 transitions. [2021-02-22 02:24:41,165 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-02-22 02:24:41,168 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 27 [2021-02-22 02:24:41,170 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-02-22 02:24:41,181 INFO L225 Difference]: With dead ends: 57 [2021-02-22 02:24:41,181 INFO L226 Difference]: Without dead ends: 36 [2021-02-22 02:24:41,186 INFO L677 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 [2021-02-22 02:24:41,208 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2021-02-22 02:24:41,261 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2021-02-22 02:24:41,263 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2021-02-22 02:24:41,267 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 39 transitions. [2021-02-22 02:24:41,270 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 39 transitions. Word has length 27 [2021-02-22 02:24:41,271 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-02-22 02:24:41,271 INFO L480 AbstractCegarLoop]: Abstraction has 36 states and 39 transitions. [2021-02-22 02:24:41,271 INFO L481 AbstractCegarLoop]: Interpolant automaton has 3 states. [2021-02-22 02:24:41,272 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 39 transitions. [2021-02-22 02:24:41,275 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2021-02-22 02:24:41,275 INFO L414 BasicCegarLoop]: Found error trace [2021-02-22 02:24:41,276 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] [2021-02-22 02:24:41,277 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-02-22 02:24:41,277 INFO L428 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-02-22 02:24:41,279 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-02-22 02:24:41,279 INFO L82 PathProgramCache]: Analyzing trace with hash -2031508803, now seen corresponding path program 1 times [2021-02-22 02:24:41,279 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-02-22 02:24:41,281 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1157996113] [2021-02-22 02:24:41,282 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-02-22 02:24:41,301 INFO L218 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-02-22 02:24:41,407 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-22 02:24:41,556 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-22 02:24:41,557 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-02-22 02:24:41,559 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-22 02:24:41,560 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-02-22 02:24:41,578 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-22 02:24:41,579 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 7 [2021-02-22 02:24:41,597 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-22 02:24:41,598 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 10 [2021-02-22 02:24:41,611 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-22 02:24:41,612 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 13 [2021-02-22 02:24:41,635 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-22 02:24:41,636 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-02-22 02:24:41,659 WARN L141 QuantifierPusher]: treesize reduction 24, result has 70.7 percent of original size [2021-02-22 02:24:41,662 WARN L147 QuantifierPusher]: treesize reduction 24, result has 70.7 percent of original size 58 [2021-02-22 02:24:41,685 WARN L141 QuantifierPusher]: treesize reduction 25, result has 80.8 percent of original size [2021-02-22 02:24:41,689 WARN L147 QuantifierPusher]: treesize reduction 25, result has 80.8 percent of original size 105 [2021-02-22 02:24:41,709 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-22 02:24:41,709 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 4 [2021-02-22 02:24:41,717 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-22 02:24:41,718 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 4 [2021-02-22 02:24:41,727 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-22 02:24:41,728 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-02-22 02:24:41,787 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-02-22 02:24:41,792 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-22 02:24:41,801 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-22 02:24:41,802 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-02-22 02:24:41,807 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-02-22 02:24:41,808 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1157996113] [2021-02-22 02:24:41,808 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-02-22 02:24:41,808 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [10] imperfect sequences [] total 10 [2021-02-22 02:24:41,808 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [480212359] [2021-02-22 02:24:41,809 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-02-22 02:24:41,810 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-02-22 02:24:41,810 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-02-22 02:24:41,811 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=63, Unknown=0, NotChecked=0, Total=90 [2021-02-22 02:24:41,811 INFO L87 Difference]: Start difference. First operand 36 states and 39 transitions. Second operand 10 states. [2021-02-22 02:24:42,363 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-02-22 02:24:42,363 INFO L93 Difference]: Finished difference Result 87 states and 107 transitions. [2021-02-22 02:24:42,364 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-02-22 02:24:42,364 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 27 [2021-02-22 02:24:42,365 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-02-22 02:24:42,370 INFO L225 Difference]: With dead ends: 87 [2021-02-22 02:24:42,371 INFO L226 Difference]: Without dead ends: 70 [2021-02-22 02:24:42,373 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 3 SyntacticMatches, 2 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 36 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=77, Invalid=195, Unknown=0, NotChecked=0, Total=272 [2021-02-22 02:24:42,376 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2021-02-22 02:24:42,409 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 38. [2021-02-22 02:24:42,409 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2021-02-22 02:24:42,411 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 41 transitions. [2021-02-22 02:24:42,411 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 41 transitions. Word has length 27 [2021-02-22 02:24:42,411 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-02-22 02:24:42,412 INFO L480 AbstractCegarLoop]: Abstraction has 38 states and 41 transitions. [2021-02-22 02:24:42,412 INFO L481 AbstractCegarLoop]: Interpolant automaton has 10 states. [2021-02-22 02:24:42,416 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 41 transitions. [2021-02-22 02:24:42,417 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2021-02-22 02:24:42,417 INFO L414 BasicCegarLoop]: Found error trace [2021-02-22 02:24:42,417 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] [2021-02-22 02:24:42,418 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-02-22 02:24:42,420 INFO L428 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-02-22 02:24:42,423 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-02-22 02:24:42,424 INFO L82 PathProgramCache]: Analyzing trace with hash -281319703, now seen corresponding path program 1 times [2021-02-22 02:24:42,424 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-02-22 02:24:42,424 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1558992387] [2021-02-22 02:24:42,425 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-02-22 02:24:43,069 WARN L202 SmtUtils]: Spent 622.00 ms on a formula simplification. DAG size of input: 81 DAG size of output: 81 [2021-02-22 02:24:43,081 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.loopaccelerator.AcceleratorWernerOverapprox.accelerateLoop(AcceleratorWernerOverapprox.java:55) at de.uni_freiburg.informatik.ultimate.lib.acceleratedinterpolation.AcceleratedInterpolationCore.acceleratedInterpolationCoreIsCorrect(AcceleratedInterpolationCore.java:183) at de.uni_freiburg.informatik.ultimate.lib.acceleratedinterpolation.AcceleratedInterpolation.(AcceleratedInterpolation.java:162) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModulePreferences.construct(IpTcStrategyModulePreferences.java:145) 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:437) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:372) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopUtils.getCegarLoopResult(CegarLoopUtils.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopUtils.getCegarLoopResult(CegarLoopUtils.java:62) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.iterateAllErrorsAtOnce(TraceAbstractionStarter.java:317) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:171) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:131) 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) [2021-02-22 02:24:43,086 INFO L168 Benchmark]: Toolchain (without parser) took 3668.03 ms. Allocated memory was 157.3 MB in the beginning and 205.5 MB in the end (delta: 48.2 MB). Free memory was 133.5 MB in the beginning and 129.1 MB in the end (delta: 4.3 MB). Peak memory consumption was 85.5 MB. Max. memory is 8.0 GB. [2021-02-22 02:24:43,087 INFO L168 Benchmark]: CDTParser took 0.19 ms. Allocated memory is still 157.3 MB. Free memory is still 131.9 MB. There was no memory consumed. Max. memory is 8.0 GB. [2021-02-22 02:24:43,088 INFO L168 Benchmark]: CACSL2BoogieTranslator took 359.85 ms. Allocated memory is still 157.3 MB. Free memory was 132.3 MB in the beginning and 122.8 MB in the end (delta: 9.5 MB). Peak memory consumption was 9.4 MB. Max. memory is 8.0 GB. [2021-02-22 02:24:43,089 INFO L168 Benchmark]: Boogie Preprocessor took 41.63 ms. Allocated memory is still 157.3 MB. Free memory was 122.8 MB in the beginning and 121.3 MB in the end (delta: 1.5 MB). Peak memory consumption was 2.1 MB. Max. memory is 8.0 GB. [2021-02-22 02:24:43,089 INFO L168 Benchmark]: RCFGBuilder took 597.36 ms. Allocated memory is still 157.3 MB. Free memory was 121.3 MB in the beginning and 136.7 MB in the end (delta: -15.4 MB). Peak memory consumption was 15.7 MB. Max. memory is 8.0 GB. [2021-02-22 02:24:43,090 INFO L168 Benchmark]: TraceAbstraction took 2641.82 ms. Allocated memory was 157.3 MB in the beginning and 205.5 MB in the end (delta: 48.2 MB). Free memory was 136.2 MB in the beginning and 129.1 MB in the end (delta: 7.1 MB). Peak memory consumption was 87.9 MB. Max. memory is 8.0 GB. [2021-02-22 02:24:43,094 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 157.3 MB. Free memory is still 131.9 MB. There was no memory consumed. Max. memory is 8.0 GB. * CACSL2BoogieTranslator took 359.85 ms. Allocated memory is still 157.3 MB. Free memory was 132.3 MB in the beginning and 122.8 MB in the end (delta: 9.5 MB). Peak memory consumption was 9.4 MB. Max. memory is 8.0 GB. * Boogie Preprocessor took 41.63 ms. Allocated memory is still 157.3 MB. Free memory was 122.8 MB in the beginning and 121.3 MB in the end (delta: 1.5 MB). Peak memory consumption was 2.1 MB. Max. memory is 8.0 GB. * RCFGBuilder took 597.36 ms. Allocated memory is still 157.3 MB. Free memory was 121.3 MB in the beginning and 136.7 MB in the end (delta: -15.4 MB). Peak memory consumption was 15.7 MB. Max. memory is 8.0 GB. * TraceAbstraction took 2641.82 ms. Allocated memory was 157.3 MB in the beginning and 205.5 MB in the end (delta: 48.2 MB). Free memory was 136.2 MB in the beginning and 129.1 MB in the end (delta: 7.1 MB). Peak memory consumption was 87.9 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.loopaccelerator.AcceleratorWernerOverapprox.accelerateLoop(AcceleratorWernerOverapprox.java:55) RESULT: Ultimate could not prove your program: Toolchain returned no result. Received shutdown request...