/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data -s ../../../trunk/examples/settings/default/taipan/svcomp-Reach-32bit-Taipan_Default.epf -tc ../../../trunk/examples/toolchains/AutomizerC.xml --sifa.abstract.domain OctagonDomain -i ../sv-benchmarks/c/array-fpi/ss2f.c -------------------------------------------------------------------------------- This is Ultimate 0.2.3-dev-f954360 [2023-04-02 15:42:51,595 INFO L177 SettingsManager]: Resetting all preferences to default values... [2023-04-02 15:42:51,597 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2023-04-02 15:42:51,614 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2023-04-02 15:42:51,615 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2023-04-02 15:42:51,615 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2023-04-02 15:42:51,616 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2023-04-02 15:42:51,617 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2023-04-02 15:42:51,619 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2023-04-02 15:42:51,619 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2023-04-02 15:42:51,620 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2023-04-02 15:42:51,620 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2023-04-02 15:42:51,621 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2023-04-02 15:42:51,621 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2023-04-02 15:42:51,622 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2023-04-02 15:42:51,623 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2023-04-02 15:42:51,623 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2023-04-02 15:42:51,624 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2023-04-02 15:42:51,632 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2023-04-02 15:42:51,637 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2023-04-02 15:42:51,638 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2023-04-02 15:42:51,640 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2023-04-02 15:42:51,641 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2023-04-02 15:42:51,642 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2023-04-02 15:42:51,643 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2023-04-02 15:42:51,644 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2023-04-02 15:42:51,644 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2023-04-02 15:42:51,644 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2023-04-02 15:42:51,644 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2023-04-02 15:42:51,645 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2023-04-02 15:42:51,645 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2023-04-02 15:42:51,646 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2023-04-02 15:42:51,646 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2023-04-02 15:42:51,646 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2023-04-02 15:42:51,647 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2023-04-02 15:42:51,647 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2023-04-02 15:42:51,648 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2023-04-02 15:42:51,648 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2023-04-02 15:42:51,648 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2023-04-02 15:42:51,648 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2023-04-02 15:42:51,649 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2023-04-02 15:42:51,656 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/taipan/svcomp-Reach-32bit-Taipan_Default.epf [2023-04-02 15:42:51,676 INFO L113 SettingsManager]: Loading preferences was successful [2023-04-02 15:42:51,676 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2023-04-02 15:42:51,676 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-04-02 15:42:51,676 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-04-02 15:42:51,677 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-04-02 15:42:51,677 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-04-02 15:42:51,677 INFO L138 SettingsManager]: * User list type=DISABLED [2023-04-02 15:42:51,677 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-04-02 15:42:51,677 INFO L138 SettingsManager]: * Explicit value domain=true [2023-04-02 15:42:51,677 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-04-02 15:42:51,677 INFO L138 SettingsManager]: * Octagon Domain=false [2023-04-02 15:42:51,677 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2023-04-02 15:42:51,677 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-04-02 15:42:51,678 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-04-02 15:42:51,678 INFO L138 SettingsManager]: * Interval Domain=false [2023-04-02 15:42:51,678 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-04-02 15:42:51,678 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-04-02 15:42:51,678 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2023-04-02 15:42:51,678 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-04-02 15:42:51,678 INFO L138 SettingsManager]: * sizeof long=4 [2023-04-02 15:42:51,678 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2023-04-02 15:42:51,678 INFO L138 SettingsManager]: * sizeof POINTER=4 [2023-04-02 15:42:51,679 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2023-04-02 15:42:51,679 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-04-02 15:42:51,679 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-04-02 15:42:51,679 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-04-02 15:42:51,679 INFO L138 SettingsManager]: * sizeof long double=12 [2023-04-02 15:42:51,679 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2023-04-02 15:42:51,679 INFO L138 SettingsManager]: * Use constant arrays=true [2023-04-02 15:42:51,679 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-04-02 15:42:51,679 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-04-02 15:42:51,679 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2023-04-02 15:42:51,679 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-04-02 15:42:51,680 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-04-02 15:42:51,680 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2023-04-02 15:42:51,680 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-04-02 15:42:51,680 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2023-04-02 15:42:51,680 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-04-02 15:42:51,680 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-04-02 15:42:51,680 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-04-02 15:42:51,680 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-04-02 15:42:51,680 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.sifa: Abstract Domain -> OctagonDomain [2023-04-02 15:42:51,849 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-04-02 15:42:51,867 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-04-02 15:42:51,869 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-04-02 15:42:51,870 INFO L271 PluginConnector]: Initializing CDTParser... [2023-04-02 15:42:51,871 INFO L275 PluginConnector]: CDTParser initialized [2023-04-02 15:42:51,871 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/array-fpi/ss2f.c [2023-04-02 15:42:52,744 INFO L500 CDTParser]: Created temporary CDT project at NULL [2023-04-02 15:42:52,921 INFO L351 CDTParser]: Found 1 translation units. [2023-04-02 15:42:52,921 INFO L172 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/array-fpi/ss2f.c [2023-04-02 15:42:52,925 INFO L394 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/e10bb8db1/d6b528408e064e1b9534e6c6f3958052/FLAGcf5a3262c [2023-04-02 15:42:52,934 INFO L402 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/e10bb8db1/d6b528408e064e1b9534e6c6f3958052 [2023-04-02 15:42:52,935 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-04-02 15:42:52,936 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2023-04-02 15:42:52,937 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-04-02 15:42:52,937 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-04-02 15:42:52,943 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2023-04-02 15:42:52,944 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.04 03:42:52" (1/1) ... [2023-04-02 15:42:52,944 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@6e51a4e7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 03:42:52, skipping insertion in model container [2023-04-02 15:42:52,944 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.04 03:42:52" (1/1) ... [2023-04-02 15:42:52,949 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2023-04-02 15:42:52,962 INFO L178 MainTranslator]: Built tables and reachable declarations [2023-04-02 15:42:53,053 WARN L247 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/array-fpi/ss2f.c[587,600] [2023-04-02 15:42:53,080 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-04-02 15:42:53,092 INFO L203 MainTranslator]: Completed pre-run [2023-04-02 15:42:53,104 WARN L247 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/array-fpi/ss2f.c[587,600] [2023-04-02 15:42:53,123 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-04-02 15:42:53,134 INFO L208 MainTranslator]: Completed translation [2023-04-02 15:42:53,135 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 03:42:53 WrapperNode [2023-04-02 15:42:53,135 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-04-02 15:42:53,136 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-04-02 15:42:53,136 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2023-04-02 15:42:53,136 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2023-04-02 15:42:53,144 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 03:42:53" (1/1) ... [2023-04-02 15:42:53,144 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 03:42:53" (1/1) ... [2023-04-02 15:42:53,156 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 03:42:53" (1/1) ... [2023-04-02 15:42:53,156 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 03:42:53" (1/1) ... [2023-04-02 15:42:53,171 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 03:42:53" (1/1) ... [2023-04-02 15:42:53,174 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 03:42:53" (1/1) ... [2023-04-02 15:42:53,175 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 03:42:53" (1/1) ... [2023-04-02 15:42:53,176 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 03:42:53" (1/1) ... [2023-04-02 15:42:53,182 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-04-02 15:42:53,183 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-04-02 15:42:53,183 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2023-04-02 15:42:53,183 INFO L275 PluginConnector]: RCFGBuilder initialized [2023-04-02 15:42:53,184 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 03:42:53" (1/1) ... [2023-04-02 15:42:53,190 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-04-02 15:42:53,199 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 15:42:53,209 INFO L229 MonitoredProcess]: Starting monitored process 1 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-04-02 15:42:53,227 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-04-02 15:42:53,239 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2023-04-02 15:42:53,239 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-04-02 15:42:53,239 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2023-04-02 15:42:53,240 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2023-04-02 15:42:53,240 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2023-04-02 15:42:53,240 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2023-04-02 15:42:53,240 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2023-04-02 15:42:53,240 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2023-04-02 15:42:53,240 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2023-04-02 15:42:53,240 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-04-02 15:42:53,240 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2023-04-02 15:42:53,240 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2023-04-02 15:42:53,241 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2023-04-02 15:42:53,241 INFO L130 BoogieDeclarations]: Found specification of procedure malloc [2023-04-02 15:42:53,241 INFO L130 BoogieDeclarations]: Found specification of procedure main [2023-04-02 15:42:53,241 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2023-04-02 15:42:53,241 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2023-04-02 15:42:53,241 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2023-04-02 15:42:53,241 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2023-04-02 15:42:53,241 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-04-02 15:42:53,241 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2023-04-02 15:42:53,241 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-04-02 15:42:53,242 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-04-02 15:42:53,315 INFO L236 CfgBuilder]: Building ICFG [2023-04-02 15:42:53,317 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2023-04-02 15:42:53,477 INFO L277 CfgBuilder]: Performing block encoding [2023-04-02 15:42:53,529 INFO L297 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-04-02 15:42:53,529 INFO L302 CfgBuilder]: Removed 7 assume(true) statements. [2023-04-02 15:42:53,531 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.04 03:42:53 BoogieIcfgContainer [2023-04-02 15:42:53,531 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-04-02 15:42:53,532 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-04-02 15:42:53,532 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2023-04-02 15:42:53,534 INFO L275 PluginConnector]: TraceAbstraction initialized [2023-04-02 15:42:53,534 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.04 03:42:52" (1/3) ... [2023-04-02 15:42:53,535 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@34aad85b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.04 03:42:53, skipping insertion in model container [2023-04-02 15:42:53,535 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 03:42:53" (2/3) ... [2023-04-02 15:42:53,535 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@34aad85b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.04 03:42:53, skipping insertion in model container [2023-04-02 15:42:53,535 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.04 03:42:53" (3/3) ... [2023-04-02 15:42:53,536 INFO L112 eAbstractionObserver]: Analyzing ICFG ss2f.c [2023-04-02 15:42:53,547 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-04-02 15:42:53,547 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-04-02 15:42:53,576 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-04-02 15:42:53,580 INFO L357 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mPorIndependenceSettings=[Lde.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.partialorder.independence.IndependenceSettings;@5a260a0d, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-04-02 15:42:53,580 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-04-02 15:42:53,583 INFO L276 IsEmpty]: Start isEmpty. Operand has 29 states, 19 states have (on average 1.5263157894736843) internal successors, (29), 20 states have internal predecessors, (29), 4 states have call successors, (4), 4 states have call predecessors, (4), 4 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2023-04-02 15:42:53,587 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2023-04-02 15:42:53,587 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 15:42:53,588 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 15:42:53,589 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 15:42:53,593 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 15:42:53,593 INFO L85 PathProgramCache]: Analyzing trace with hash 1106505574, now seen corresponding path program 1 times [2023-04-02 15:42:53,599 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 15:42:53,599 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [765528951] [2023-04-02 15:42:53,599 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 15:42:53,600 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 15:42:53,700 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-04-02 15:42:53,700 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1188935075] [2023-04-02 15:42:53,700 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 15:42:53,701 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 15:42:53,701 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 15:42:53,704 INFO L229 MonitoredProcess]: Starting monitored process 2 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-02 15:42:53,705 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-04-02 15:42:53,783 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 15:42:53,789 INFO L262 TraceCheckSpWp]: Trace formula consists of 139 conjuncts, 3 conjunts are in the unsatisfiable core [2023-04-02 15:42:53,793 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 15:42:53,850 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-02 15:42:53,850 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-04-02 15:42:53,850 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 15:42:53,850 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [765528951] [2023-04-02 15:42:53,851 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-04-02 15:42:53,851 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1188935075] [2023-04-02 15:42:53,851 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1188935075] provided 1 perfect and 0 imperfect interpolant sequences [2023-04-02 15:42:53,851 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-04-02 15:42:53,851 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-04-02 15:42:53,853 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1382534617] [2023-04-02 15:42:53,853 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-04-02 15:42:53,856 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-04-02 15:42:53,856 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 15:42:53,877 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-04-02 15:42:53,877 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2023-04-02 15:42:53,879 INFO L87 Difference]: Start difference. First operand has 29 states, 19 states have (on average 1.5263157894736843) internal successors, (29), 20 states have internal predecessors, (29), 4 states have call successors, (4), 4 states have call predecessors, (4), 4 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) Second operand has 4 states, 4 states have (on average 3.75) internal successors, (15), 4 states have internal predecessors, (15), 3 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-04-02 15:42:53,944 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 15:42:53,944 INFO L93 Difference]: Finished difference Result 60 states and 83 transitions. [2023-04-02 15:42:53,945 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-04-02 15:42:53,946 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 3.75) internal successors, (15), 4 states have internal predecessors, (15), 3 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 21 [2023-04-02 15:42:53,946 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 15:42:53,951 INFO L225 Difference]: With dead ends: 60 [2023-04-02 15:42:53,951 INFO L226 Difference]: Without dead ends: 34 [2023-04-02 15:42:53,953 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 18 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2023-04-02 15:42:53,955 INFO L413 NwaCegarLoop]: 20 mSDtfsCounter, 27 mSDsluCounter, 19 mSDsCounter, 0 mSdLazyCounter, 41 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 28 SdHoareTripleChecker+Valid, 39 SdHoareTripleChecker+Invalid, 54 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 41 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-04-02 15:42:53,956 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [28 Valid, 39 Invalid, 54 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 41 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-04-02 15:42:53,966 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2023-04-02 15:42:53,978 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 31. [2023-04-02 15:42:53,978 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 31 states, 23 states have (on average 1.3043478260869565) internal successors, (30), 23 states have internal predecessors, (30), 4 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-04-02 15:42:53,979 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 37 transitions. [2023-04-02 15:42:53,980 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 37 transitions. Word has length 21 [2023-04-02 15:42:53,980 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 15:42:53,980 INFO L495 AbstractCegarLoop]: Abstraction has 31 states and 37 transitions. [2023-04-02 15:42:53,980 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 3.75) internal successors, (15), 4 states have internal predecessors, (15), 3 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-04-02 15:42:53,981 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 37 transitions. [2023-04-02 15:42:53,981 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2023-04-02 15:42:53,981 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 15:42:53,981 INFO L195 NwaCegarLoop]: 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] [2023-04-02 15:42:53,988 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2023-04-02 15:42:54,186 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable0 [2023-04-02 15:42:54,186 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 15:42:54,187 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 15:42:54,187 INFO L85 PathProgramCache]: Analyzing trace with hash 1184395259, now seen corresponding path program 1 times [2023-04-02 15:42:54,187 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 15:42:54,187 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1028445723] [2023-04-02 15:42:54,187 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 15:42:54,187 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 15:42:54,234 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-04-02 15:42:54,235 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1062219689] [2023-04-02 15:42:54,235 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 15:42:54,235 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 15:42:54,235 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 15:42:54,246 INFO L229 MonitoredProcess]: Starting monitored process 3 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-02 15:42:54,248 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-04-02 15:42:54,330 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2023-04-02 15:42:54,331 INFO L356 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2023-04-02 15:42:54,354 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2023-04-02 15:42:54,373 INFO L130 FreeRefinementEngine]: Strategy SIFA_TAIPAN found a feasible trace [2023-04-02 15:42:54,373 INFO L360 BasicCegarLoop]: Counterexample is feasible [2023-04-02 15:42:54,374 INFO L805 garLoopResultBuilder]: Registering result UNSAFE for location __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION (0 of 1 remaining) [2023-04-02 15:42:54,381 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2023-04-02 15:42:54,580 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1 [2023-04-02 15:42:54,583 INFO L445 BasicCegarLoop]: Path program histogram: [1, 1] [2023-04-02 15:42:54,588 INFO L178 ceAbstractionStarter]: Computing trace abstraction results [2023-04-02 15:42:54,605 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 02.04 03:42:54 BoogieIcfgContainer [2023-04-02 15:42:54,605 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2023-04-02 15:42:54,605 INFO L158 Benchmark]: Toolchain (without parser) took 1668.78ms. Allocated memory is still 293.6MB. Free memory was 257.2MB in the beginning and 178.1MB in the end (delta: 79.2MB). Peak memory consumption was 78.6MB. Max. memory is 8.0GB. [2023-04-02 15:42:54,605 INFO L158 Benchmark]: CDTParser took 0.09ms. Allocated memory is still 197.1MB. Free memory is still 143.8MB. There was no memory consumed. Max. memory is 8.0GB. [2023-04-02 15:42:54,606 INFO L158 Benchmark]: CACSL2BoogieTranslator took 198.08ms. Allocated memory is still 293.6MB. Free memory was 257.2MB in the beginning and 246.2MB in the end (delta: 11.0MB). Peak memory consumption was 10.5MB. Max. memory is 8.0GB. [2023-04-02 15:42:54,606 INFO L158 Benchmark]: Boogie Preprocessor took 46.06ms. Allocated memory is still 293.6MB. Free memory was 246.2MB in the beginning and 244.1MB in the end (delta: 2.1MB). Peak memory consumption was 2.1MB. Max. memory is 8.0GB. [2023-04-02 15:42:54,606 INFO L158 Benchmark]: RCFGBuilder took 348.17ms. Allocated memory is still 293.6MB. Free memory was 244.1MB in the beginning and 225.8MB in the end (delta: 18.4MB). Peak memory consumption was 18.9MB. Max. memory is 8.0GB. [2023-04-02 15:42:54,607 INFO L158 Benchmark]: TraceAbstraction took 1072.51ms. Allocated memory is still 293.6MB. Free memory was 225.2MB in the beginning and 178.1MB in the end (delta: 47.2MB). Peak memory consumption was 47.2MB. Max. memory is 8.0GB. [2023-04-02 15:42:54,608 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.09ms. Allocated memory is still 197.1MB. Free memory is still 143.8MB. There was no memory consumed. Max. memory is 8.0GB. * CACSL2BoogieTranslator took 198.08ms. Allocated memory is still 293.6MB. Free memory was 257.2MB in the beginning and 246.2MB in the end (delta: 11.0MB). Peak memory consumption was 10.5MB. Max. memory is 8.0GB. * Boogie Preprocessor took 46.06ms. Allocated memory is still 293.6MB. Free memory was 246.2MB in the beginning and 244.1MB in the end (delta: 2.1MB). Peak memory consumption was 2.1MB. Max. memory is 8.0GB. * RCFGBuilder took 348.17ms. Allocated memory is still 293.6MB. Free memory was 244.1MB in the beginning and 225.8MB in the end (delta: 18.4MB). Peak memory consumption was 18.9MB. Max. memory is 8.0GB. * TraceAbstraction took 1072.51ms. Allocated memory is still 293.6MB. Free memory was 225.2MB in the beginning and 178.1MB in the end (delta: 47.2MB). Peak memory consumption was 47.2MB. Max. memory is 8.0GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - StatisticsResult: ErrorAutomatonStatistics NumberErrorTraces: 0, NumberStatementsAllTraces: 0, NumberRelevantStatements: 0, 0.0s ErrorAutomatonConstructionTimeTotal, 0.0s FaulLocalizationTime, NumberStatementsFirstTrace: -1, TraceLengthAvg: 0, 0.0s ErrorAutomatonConstructionTimeAvg, 0.0s ErrorAutomatonDifferenceTimeAvg, 0.0s ErrorAutomatonDifferenceTimeTotal, NumberOfNoEnhancement: 0, NumberOfFiniteEnhancement: 0, NumberOfInfiniteEnhancement: 0 - CounterExampleResult [Line: 15]: a call to reach_error is reachable a call to reach_error is reachable We found a FailurePath: [L19] int N; [L23] N = __VERIFIER_nondet_int() [L24] COND FALSE !(N <= 0) VAL [N=1, \old(N)=0] [L25] CALL assume_abort_if_not(N <= 2147483647/sizeof(int)) VAL [N=1, \old(N)=0, \old(cond)=1] [L13] COND FALSE !(!cond) [L25] RET assume_abort_if_not(N <= 2147483647/sizeof(int)) VAL [N=1, \old(N)=0] [L27] int i; [L28] long long sum[1]; [L29] long long *a = malloc(sizeof(long long)*N); [L31] sum[0] = 0 [L32] i=0 VAL [N=1, \old(N)=0, a={-1:0}, i=0, sum={4:0}] [L32] COND TRUE i