./Ultimate.py --spec ../../sv-benchmarks/c/properties/valid-memsafety.prp --file ../../sv-benchmarks/c/array-memsafety/reverse_array_alloca_unsafe.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for memory safety (deref-memtrack) Using default analysis Version a4ecdabc Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud-vcloud-master/worker/run_dir_47cc7f5c-0c77-4807-afe8-5aef1aa8f54e/bin/utaipan/data/config -Xmx15G -Xms4m -jar /tmp/vcloud-vcloud-master/worker/run_dir_47cc7f5c-0c77-4807-afe8-5aef1aa8f54e/bin/utaipan/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud-vcloud-master/worker/run_dir_47cc7f5c-0c77-4807-afe8-5aef1aa8f54e/bin/utaipan/data -tc /tmp/vcloud-vcloud-master/worker/run_dir_47cc7f5c-0c77-4807-afe8-5aef1aa8f54e/bin/utaipan/config/TaipanMemDerefMemtrack.xml -i ../../sv-benchmarks/c/array-memsafety/reverse_array_alloca_unsafe.i -s /tmp/vcloud-vcloud-master/worker/run_dir_47cc7f5c-0c77-4807-afe8-5aef1aa8f54e/bin/utaipan/config/svcomp-DerefFreeMemtrack-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud-vcloud-master/worker/run_dir_47cc7f5c-0c77-4807-afe8-5aef1aa8f54e/bin/utaipan --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 016c9c68c49c3eaa925dd855e3c8f320ab9c50c9 ................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ Execution finished normally Writing output log to file Ultimate.log Writing human readable error path to file UltimateCounterExample.errorpath Result: FALSE(valid-deref) --- Real Ultimate output --- This is Ultimate 0.2.0-a4ecdab [2020-11-30 03:01:47,366 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-11-30 03:01:47,369 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-11-30 03:01:47,464 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-11-30 03:01:47,465 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-11-30 03:01:47,472 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-11-30 03:01:47,475 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-11-30 03:01:47,484 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-11-30 03:01:47,488 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-11-30 03:01:47,496 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-11-30 03:01:47,497 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-11-30 03:01:47,500 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-11-30 03:01:47,501 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-11-30 03:01:47,505 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-11-30 03:01:47,507 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-11-30 03:01:47,510 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-11-30 03:01:47,512 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-11-30 03:01:47,516 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-11-30 03:01:47,520 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-11-30 03:01:47,530 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-11-30 03:01:47,533 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-11-30 03:01:47,535 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-11-30 03:01:47,538 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-11-30 03:01:47,539 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-11-30 03:01:47,554 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-11-30 03:01:47,555 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-11-30 03:01:47,556 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-11-30 03:01:47,558 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-11-30 03:01:47,559 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-11-30 03:01:47,561 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-11-30 03:01:47,561 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-11-30 03:01:47,563 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-11-30 03:01:47,566 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-11-30 03:01:47,567 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-11-30 03:01:47,569 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-11-30 03:01:47,569 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-11-30 03:01:47,570 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-11-30 03:01:47,571 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-11-30 03:01:47,571 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-11-30 03:01:47,572 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-11-30 03:01:47,573 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-11-30 03:01:47,578 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud-vcloud-master/worker/run_dir_47cc7f5c-0c77-4807-afe8-5aef1aa8f54e/bin/utaipan/config/svcomp-DerefFreeMemtrack-32bit-Taipan_Default.epf [2020-11-30 03:01:47,628 INFO L113 SettingsManager]: Loading preferences was successful [2020-11-30 03:01:47,628 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-11-30 03:01:47,630 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2020-11-30 03:01:47,630 INFO L138 SettingsManager]: * User list type=DISABLED [2020-11-30 03:01:47,631 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2020-11-30 03:01:47,631 INFO L138 SettingsManager]: * Explicit value domain=true [2020-11-30 03:01:47,631 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2020-11-30 03:01:47,631 INFO L138 SettingsManager]: * Octagon Domain=false [2020-11-30 03:01:47,632 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2020-11-30 03:01:47,632 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2020-11-30 03:01:47,633 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2020-11-30 03:01:47,634 INFO L138 SettingsManager]: * Interval Domain=false [2020-11-30 03:01:47,634 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2020-11-30 03:01:47,634 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2020-11-30 03:01:47,634 INFO L138 SettingsManager]: * Simplification Technique=SIMPLIFY_QUICK [2020-11-30 03:01:47,635 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-11-30 03:01:47,636 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-11-30 03:01:47,636 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-11-30 03:01:47,636 INFO L138 SettingsManager]: * sizeof long=4 [2020-11-30 03:01:47,637 INFO L138 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2020-11-30 03:01:47,637 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-11-30 03:01:47,637 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-11-30 03:01:47,637 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-11-30 03:01:47,638 INFO L138 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2020-11-30 03:01:47,638 INFO L138 SettingsManager]: * Bitprecise bitfields=true [2020-11-30 03:01:47,638 INFO L138 SettingsManager]: * SV-COMP memtrack compatibility mode=true [2020-11-30 03:01:47,640 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-11-30 03:01:47,640 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2020-11-30 03:01:47,641 INFO L138 SettingsManager]: * sizeof long double=12 [2020-11-30 03:01:47,641 INFO L138 SettingsManager]: * Use constant arrays=true [2020-11-30 03:01:47,641 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-11-30 03:01:47,642 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-11-30 03:01:47,642 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-11-30 03:01:47,642 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-11-30 03:01:47,643 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-11-30 03:01:47,643 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-11-30 03:01:47,643 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2020-11-30 03:01:47,643 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-11-30 03:01:47,644 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-11-30 03:01:47,644 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2020-11-30 03:01:47,648 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/tmp/vcloud-vcloud-master/worker/run_dir_47cc7f5c-0c77-4807-afe8-5aef1aa8f54e/bin/utaipan/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud-vcloud-master/worker/run_dir_47cc7f5c-0c77-4807-afe8-5aef1aa8f54e/bin/utaipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 016c9c68c49c3eaa925dd855e3c8f320ab9c50c9 [2020-11-30 03:01:47,976 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-11-30 03:01:48,026 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-11-30 03:01:48,029 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-11-30 03:01:48,030 INFO L271 PluginConnector]: Initializing CDTParser... [2020-11-30 03:01:48,031 INFO L275 PluginConnector]: CDTParser initialized [2020-11-30 03:01:48,032 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud-vcloud-master/worker/run_dir_47cc7f5c-0c77-4807-afe8-5aef1aa8f54e/bin/utaipan/../../sv-benchmarks/c/array-memsafety/reverse_array_alloca_unsafe.i [2020-11-30 03:01:48,107 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud-vcloud-master/worker/run_dir_47cc7f5c-0c77-4807-afe8-5aef1aa8f54e/bin/utaipan/data/258eff6e7/3dab966745924c1781e236b3289978d0/FLAG89f3e2445 [2020-11-30 03:01:48,676 INFO L306 CDTParser]: Found 1 translation units. [2020-11-30 03:01:48,681 INFO L160 CDTParser]: Scanning /tmp/vcloud-vcloud-master/worker/run_dir_47cc7f5c-0c77-4807-afe8-5aef1aa8f54e/sv-benchmarks/c/array-memsafety/reverse_array_alloca_unsafe.i [2020-11-30 03:01:48,708 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud-vcloud-master/worker/run_dir_47cc7f5c-0c77-4807-afe8-5aef1aa8f54e/bin/utaipan/data/258eff6e7/3dab966745924c1781e236b3289978d0/FLAG89f3e2445 [2020-11-30 03:01:48,944 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud-vcloud-master/worker/run_dir_47cc7f5c-0c77-4807-afe8-5aef1aa8f54e/bin/utaipan/data/258eff6e7/3dab966745924c1781e236b3289978d0 [2020-11-30 03:01:48,947 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-11-30 03:01:48,950 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2020-11-30 03:01:48,954 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-11-30 03:01:48,954 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-11-30 03:01:48,958 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-11-30 03:01:48,959 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 30.11 03:01:48" (1/1) ... [2020-11-30 03:01:48,961 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@66ebf08e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 30.11 03:01:48, skipping insertion in model container [2020-11-30 03:01:48,961 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 30.11 03:01:48" (1/1) ... [2020-11-30 03:01:48,970 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-11-30 03:01:49,010 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-11-30 03:01:49,463 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-11-30 03:01:49,473 INFO L203 MainTranslator]: Completed pre-run [2020-11-30 03:01:49,548 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-11-30 03:01:49,618 INFO L208 MainTranslator]: Completed translation [2020-11-30 03:01:49,620 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 30.11 03:01:49 WrapperNode [2020-11-30 03:01:49,620 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-11-30 03:01:49,622 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2020-11-30 03:01:49,623 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2020-11-30 03:01:49,623 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2020-11-30 03:01:49,632 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 30.11 03:01:49" (1/1) ... [2020-11-30 03:01:49,670 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 30.11 03:01:49" (1/1) ... [2020-11-30 03:01:49,709 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2020-11-30 03:01:49,710 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-11-30 03:01:49,710 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-11-30 03:01:49,711 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-11-30 03:01:49,721 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 30.11 03:01:49" (1/1) ... [2020-11-30 03:01:49,722 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 30.11 03:01:49" (1/1) ... [2020-11-30 03:01:49,733 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 30.11 03:01:49" (1/1) ... [2020-11-30 03:01:49,734 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 30.11 03:01:49" (1/1) ... [2020-11-30 03:01:49,750 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 30.11 03:01:49" (1/1) ... [2020-11-30 03:01:49,758 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 30.11 03:01:49" (1/1) ... [2020-11-30 03:01:49,766 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 30.11 03:01:49" (1/1) ... [2020-11-30 03:01:49,774 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-11-30 03:01:49,775 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-11-30 03:01:49,775 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-11-30 03:01:49,776 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-11-30 03:01:49,777 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 30.11 03:01:49" (1/1) ... No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_47cc7f5c-0c77-4807-afe8-5aef1aa8f54e/bin/utaipan/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 [2020-11-30 03:01:49,869 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-11-30 03:01:49,869 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-11-30 03:01:49,870 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-11-30 03:01:49,870 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-11-30 03:01:49,870 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-11-30 03:01:49,870 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-11-30 03:01:50,989 INFO L293 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-11-30 03:01:50,990 INFO L298 CfgBuilder]: Removed 7 assume(true) statements. [2020-11-30 03:01:50,992 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 30.11 03:01:50 BoogieIcfgContainer [2020-11-30 03:01:50,992 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-11-30 03:01:50,994 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-11-30 03:01:50,994 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-11-30 03:01:51,006 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-11-30 03:01:51,006 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 30.11 03:01:48" (1/3) ... [2020-11-30 03:01:51,007 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7668936 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 30.11 03:01:51, skipping insertion in model container [2020-11-30 03:01:51,007 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 30.11 03:01:49" (2/3) ... [2020-11-30 03:01:51,007 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7668936 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 30.11 03:01:51, skipping insertion in model container [2020-11-30 03:01:51,007 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 30.11 03:01:50" (3/3) ... [2020-11-30 03:01:51,008 INFO L111 eAbstractionObserver]: Analyzing ICFG reverse_array_alloca_unsafe.i [2020-11-30 03:01:51,018 INFO L164 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2020-11-30 03:01:51,023 INFO L176 ceAbstractionStarter]: Appying trace abstraction to program that has 23 error locations. [2020-11-30 03:01:51,035 INFO L253 AbstractCegarLoop]: Starting to check reachability of 23 error locations. [2020-11-30 03:01:51,055 INFO L377 AbstractCegarLoop]: Interprodecural is true [2020-11-30 03:01:51,056 INFO L378 AbstractCegarLoop]: Hoare is false [2020-11-30 03:01:51,056 INFO L379 AbstractCegarLoop]: Compute interpolants for FPandBP [2020-11-30 03:01:51,056 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-11-30 03:01:51,056 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-11-30 03:01:51,057 INFO L382 AbstractCegarLoop]: Difference is false [2020-11-30 03:01:51,057 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-11-30 03:01:51,057 INFO L387 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-11-30 03:01:51,071 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states. [2020-11-30 03:01:51,077 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2020-11-30 03:01:51,078 INFO L414 BasicCegarLoop]: Found error trace [2020-11-30 03:01:51,078 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1] [2020-11-30 03:01:51,079 INFO L429 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr12REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr11REQUIRES_VIOLATION, ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr21REQUIRES_VIOLATION, ULTIMATE.startErr10REQUIRES_VIOLATION, ULTIMATE.startErr15REQUIRES_VIOLATION, ULTIMATE.startErr4REQUIRES_VIOLATION, ULTIMATE.startErr14REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION, ULTIMATE.startErr13REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr7REQUIRES_VIOLATION, ULTIMATE.startErr17REQUIRES_VIOLATION, ULTIMATE.startErr6REQUIRES_VIOLATION, ULTIMATE.startErr16REQUIRES_VIOLATION, ULTIMATE.startErr5REQUIRES_VIOLATION, ULTIMATE.startErr20REQUIRES_VIOLATION, ULTIMATE.startErr9REQUIRES_VIOLATION, ULTIMATE.startErr19REQUIRES_VIOLATION, ULTIMATE.startErr8REQUIRES_VIOLATION, ULTIMATE.startErr18REQUIRES_VIOLATION, ULTIMATE.startErr22ASSERT_VIOLATIONMEMORY_LEAK]=== [2020-11-30 03:01:51,089 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-30 03:01:51,089 INFO L82 PathProgramCache]: Analyzing trace with hash 157381, now seen corresponding path program 1 times [2020-11-30 03:01:51,100 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-11-30 03:01:51,101 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1310030932] [2020-11-30 03:01:51,101 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-30 03:01:51,216 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-30 03:01:51,301 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-30 03:01:51,301 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1310030932] [2020-11-30 03:01:51,302 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-11-30 03:01:51,302 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2020-11-30 03:01:51,303 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1272909050] [2020-11-30 03:01:51,308 INFO L461 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-11-30 03:01:51,308 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-11-30 03:01:51,324 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-11-30 03:01:51,325 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-11-30 03:01:51,328 INFO L87 Difference]: Start difference. First operand 44 states. Second operand 3 states. [2020-11-30 03:01:51,464 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-30 03:01:51,465 INFO L93 Difference]: Finished difference Result 39 states and 43 transitions. [2020-11-30 03:01:51,465 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-11-30 03:01:51,466 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 3 [2020-11-30 03:01:51,466 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-30 03:01:51,474 INFO L225 Difference]: With dead ends: 39 [2020-11-30 03:01:51,475 INFO L226 Difference]: Without dead ends: 38 [2020-11-30 03:01:51,477 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 1 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-11-30 03:01:51,496 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-11-30 03:01:51,510 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 38. [2020-11-30 03:01:51,512 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2020-11-30 03:01:51,513 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 42 transitions. [2020-11-30 03:01:51,515 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 42 transitions. Word has length 3 [2020-11-30 03:01:51,515 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-30 03:01:51,516 INFO L481 AbstractCegarLoop]: Abstraction has 38 states and 42 transitions. [2020-11-30 03:01:51,516 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-11-30 03:01:51,516 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 42 transitions. [2020-11-30 03:01:51,516 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2020-11-30 03:01:51,517 INFO L414 BasicCegarLoop]: Found error trace [2020-11-30 03:01:51,517 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1] [2020-11-30 03:01:51,517 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-11-30 03:01:51,517 INFO L429 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr12REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr11REQUIRES_VIOLATION, ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr21REQUIRES_VIOLATION, ULTIMATE.startErr10REQUIRES_VIOLATION, ULTIMATE.startErr15REQUIRES_VIOLATION, ULTIMATE.startErr4REQUIRES_VIOLATION, ULTIMATE.startErr14REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION, ULTIMATE.startErr13REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr7REQUIRES_VIOLATION, ULTIMATE.startErr17REQUIRES_VIOLATION, ULTIMATE.startErr6REQUIRES_VIOLATION, ULTIMATE.startErr16REQUIRES_VIOLATION, ULTIMATE.startErr5REQUIRES_VIOLATION, ULTIMATE.startErr20REQUIRES_VIOLATION, ULTIMATE.startErr9REQUIRES_VIOLATION, ULTIMATE.startErr19REQUIRES_VIOLATION, ULTIMATE.startErr8REQUIRES_VIOLATION, ULTIMATE.startErr18REQUIRES_VIOLATION, ULTIMATE.startErr22ASSERT_VIOLATIONMEMORY_LEAK]=== [2020-11-30 03:01:51,518 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-30 03:01:51,519 INFO L82 PathProgramCache]: Analyzing trace with hash 157382, now seen corresponding path program 1 times [2020-11-30 03:01:51,519 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-11-30 03:01:51,519 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1661748019] [2020-11-30 03:01:51,520 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-30 03:01:51,547 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-30 03:01:51,628 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-30 03:01:51,628 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1661748019] [2020-11-30 03:01:51,628 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-11-30 03:01:51,629 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2020-11-30 03:01:51,629 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1265453102] [2020-11-30 03:01:51,630 INFO L461 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-11-30 03:01:51,631 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-11-30 03:01:51,632 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-11-30 03:01:51,632 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-11-30 03:01:51,632 INFO L87 Difference]: Start difference. First operand 38 states and 42 transitions. Second operand 4 states. [2020-11-30 03:01:51,812 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-30 03:01:51,812 INFO L93 Difference]: Finished difference Result 40 states and 44 transitions. [2020-11-30 03:01:51,813 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-11-30 03:01:51,814 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 3 [2020-11-30 03:01:51,814 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-30 03:01:51,815 INFO L225 Difference]: With dead ends: 40 [2020-11-30 03:01:51,815 INFO L226 Difference]: Without dead ends: 40 [2020-11-30 03:01:51,816 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-11-30 03:01:51,816 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2020-11-30 03:01:51,820 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 40. [2020-11-30 03:01:51,820 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2020-11-30 03:01:51,821 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 44 transitions. [2020-11-30 03:01:51,821 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 44 transitions. Word has length 3 [2020-11-30 03:01:51,822 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-30 03:01:51,822 INFO L481 AbstractCegarLoop]: Abstraction has 40 states and 44 transitions. [2020-11-30 03:01:51,822 INFO L482 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-11-30 03:01:51,822 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 44 transitions. [2020-11-30 03:01:51,822 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6 [2020-11-30 03:01:51,823 INFO L414 BasicCegarLoop]: Found error trace [2020-11-30 03:01:51,823 INFO L422 BasicCegarLoop]: trace histogram [2, 1, 1, 1] [2020-11-30 03:01:51,823 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-11-30 03:01:51,823 INFO L429 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr12REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr11REQUIRES_VIOLATION, ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr21REQUIRES_VIOLATION, ULTIMATE.startErr10REQUIRES_VIOLATION, ULTIMATE.startErr15REQUIRES_VIOLATION, ULTIMATE.startErr4REQUIRES_VIOLATION, ULTIMATE.startErr14REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION, ULTIMATE.startErr13REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr7REQUIRES_VIOLATION, ULTIMATE.startErr17REQUIRES_VIOLATION, ULTIMATE.startErr6REQUIRES_VIOLATION, ULTIMATE.startErr16REQUIRES_VIOLATION, ULTIMATE.startErr5REQUIRES_VIOLATION, ULTIMATE.startErr20REQUIRES_VIOLATION, ULTIMATE.startErr9REQUIRES_VIOLATION, ULTIMATE.startErr19REQUIRES_VIOLATION, ULTIMATE.startErr8REQUIRES_VIOLATION, ULTIMATE.startErr18REQUIRES_VIOLATION, ULTIMATE.startErr22ASSERT_VIOLATIONMEMORY_LEAK]=== [2020-11-30 03:01:51,826 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-30 03:01:51,827 INFO L82 PathProgramCache]: Analyzing trace with hash 151338058, now seen corresponding path program 1 times [2020-11-30 03:01:51,828 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-11-30 03:01:51,832 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1109359628] [2020-11-30 03:01:51,832 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-30 03:01:51,872 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-30 03:01:51,988 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-30 03:01:51,988 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1109359628] [2020-11-30 03:01:51,988 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [62410677] [2020-11-30 03:01:51,988 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_47cc7f5c-0c77-4807-afe8-5aef1aa8f54e/bin/utaipan/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-11-30 03:01:52,074 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-30 03:01:52,077 INFO L263 TraceCheckSpWp]: Trace formula consists of 40 conjuncts, 11 conjunts are in the unsatisfiable core [2020-11-30 03:01:52,082 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-30 03:01:52,158 INFO L384 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2020-11-30 03:01:52,159 INFO L545 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-11-30 03:01:52,176 INFO L625 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-11-30 03:01:52,176 INFO L545 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2020-11-30 03:01:52,177 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:15, output treesize:14 [2020-11-30 03:01:52,252 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-30 03:01:52,253 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-11-30 03:01:52,311 INFO L603 QuantifierPusher]: Distributing 2 disjuncts over 3 conjuncts [2020-11-30 03:01:52,380 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-30 03:01:52,380 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [737265206] [2020-11-30 03:01:52,411 INFO L159 IcfgInterpreter]: Started Sifa with 4 locations of interest [2020-11-30 03:01:52,411 INFO L166 IcfgInterpreter]: Building call graph [2020-11-30 03:01:52,417 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2020-11-30 03:01:52,424 INFO L176 IcfgInterpreter]: Starting interpretation [2020-11-30 03:01:52,424 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2020-11-30 03:01:52,567 WARN L234 Elim1Store]: Array PQE input equivalent to false [2020-11-30 03:01:52,602 WARN L234 Elim1Store]: Array PQE input equivalent to false [2020-11-30 03:01:52,624 WARN L234 Elim1Store]: Array PQE input equivalent to false [2020-11-30 03:01:52,637 WARN L234 Elim1Store]: Array PQE input equivalent to false [2020-11-30 03:01:52,651 WARN L234 Elim1Store]: Array PQE input equivalent to false [2020-11-30 03:01:53,271 INFO L180 IcfgInterpreter]: Interpretation finished [2020-11-30 03:01:53,417 WARN L193 SmtUtils]: Spent 121.00 ms on a formula simplification. DAG size of input: 44 DAG size of output: 36 [2020-11-30 03:01:53,728 WARN L193 SmtUtils]: Spent 261.00 ms on a formula simplification. DAG size of input: 81 DAG size of output: 68 [2020-11-30 03:01:53,840 WARN L332 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2020-11-30 03:01:53,840 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2020-11-30 03:01:53,840 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3, 3] total 8 [2020-11-30 03:01:53,840 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1998472243] [2020-11-30 03:01:53,841 INFO L461 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-11-30 03:01:53,841 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-11-30 03:01:53,841 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-11-30 03:01:53,842 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=118, Unknown=0, NotChecked=0, Total=156 [2020-11-30 03:01:53,842 INFO L87 Difference]: Start difference. First operand 40 states and 44 transitions. Second operand 10 states. [2020-11-30 03:01:54,133 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-30 03:01:54,133 INFO L93 Difference]: Finished difference Result 39 states and 43 transitions. [2020-11-30 03:01:54,134 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-11-30 03:01:54,134 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 5 [2020-11-30 03:01:54,134 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-30 03:01:54,135 INFO L225 Difference]: With dead ends: 39 [2020-11-30 03:01:54,135 INFO L226 Difference]: Without dead ends: 39 [2020-11-30 03:01:54,136 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 26 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=54, Invalid=156, Unknown=0, NotChecked=0, Total=210 [2020-11-30 03:01:54,136 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2020-11-30 03:01:54,139 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 38. [2020-11-30 03:01:54,139 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2020-11-30 03:01:54,140 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 42 transitions. [2020-11-30 03:01:54,140 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 42 transitions. Word has length 5 [2020-11-30 03:01:54,140 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-30 03:01:54,140 INFO L481 AbstractCegarLoop]: Abstraction has 38 states and 42 transitions. [2020-11-30 03:01:54,141 INFO L482 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-11-30 03:01:54,141 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 42 transitions. [2020-11-30 03:01:54,141 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2020-11-30 03:01:54,141 INFO L414 BasicCegarLoop]: Found error trace [2020-11-30 03:01:54,141 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2020-11-30 03:01:54,342 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2 [2020-11-30 03:01:54,342 INFO L429 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr12REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr11REQUIRES_VIOLATION, ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr21REQUIRES_VIOLATION, ULTIMATE.startErr10REQUIRES_VIOLATION, ULTIMATE.startErr15REQUIRES_VIOLATION, ULTIMATE.startErr4REQUIRES_VIOLATION, ULTIMATE.startErr14REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION, ULTIMATE.startErr13REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr7REQUIRES_VIOLATION, ULTIMATE.startErr17REQUIRES_VIOLATION, ULTIMATE.startErr6REQUIRES_VIOLATION, ULTIMATE.startErr16REQUIRES_VIOLATION, ULTIMATE.startErr5REQUIRES_VIOLATION, ULTIMATE.startErr20REQUIRES_VIOLATION, ULTIMATE.startErr9REQUIRES_VIOLATION, ULTIMATE.startErr19REQUIRES_VIOLATION, ULTIMATE.startErr8REQUIRES_VIOLATION, ULTIMATE.startErr18REQUIRES_VIOLATION, ULTIMATE.startErr22ASSERT_VIOLATIONMEMORY_LEAK]=== [2020-11-30 03:01:54,343 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-30 03:01:54,343 INFO L82 PathProgramCache]: Analyzing trace with hash 396616665, now seen corresponding path program 1 times [2020-11-30 03:01:54,343 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-11-30 03:01:54,343 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2051343339] [2020-11-30 03:01:54,343 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-30 03:01:54,356 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-30 03:01:54,393 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-30 03:01:54,393 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2051343339] [2020-11-30 03:01:54,394 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [752804889] [2020-11-30 03:01:54,394 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_47cc7f5c-0c77-4807-afe8-5aef1aa8f54e/bin/utaipan/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-11-30 03:01:54,451 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-30 03:01:54,452 INFO L263 TraceCheckSpWp]: Trace formula consists of 41 conjuncts, 4 conjunts are in the unsatisfiable core [2020-11-30 03:01:54,453 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-30 03:01:54,481 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-30 03:01:54,481 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-11-30 03:01:54,497 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-30 03:01:54,498 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1556535594] [2020-11-30 03:01:54,500 INFO L159 IcfgInterpreter]: Started Sifa with 6 locations of interest [2020-11-30 03:01:54,500 INFO L166 IcfgInterpreter]: Building call graph [2020-11-30 03:01:54,500 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2020-11-30 03:01:54,500 INFO L176 IcfgInterpreter]: Starting interpretation [2020-11-30 03:01:54,500 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2020-11-30 03:01:54,548 WARN L234 Elim1Store]: Array PQE input equivalent to false [2020-11-30 03:01:54,556 WARN L234 Elim1Store]: Array PQE input equivalent to false [2020-11-30 03:01:54,564 WARN L234 Elim1Store]: Array PQE input equivalent to false [2020-11-30 03:01:54,599 WARN L234 Elim1Store]: Array PQE input equivalent to false [2020-11-30 03:01:54,607 WARN L234 Elim1Store]: Array PQE input equivalent to false [2020-11-30 03:01:55,073 INFO L180 IcfgInterpreter]: Interpretation finished [2020-11-30 03:01:55,345 WARN L193 SmtUtils]: Spent 241.00 ms on a formula simplification. DAG size of input: 82 DAG size of output: 68 [2020-11-30 03:01:55,639 WARN L193 SmtUtils]: Spent 156.00 ms on a formula simplification. DAG size of input: 85 DAG size of output: 50 [2020-11-30 03:01:55,641 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 3 imperfect interpolant sequences. [2020-11-30 03:01:55,641 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [4, 4, 4] total 10 [2020-11-30 03:01:55,642 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [526208605] [2020-11-30 03:01:55,642 INFO L461 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-11-30 03:01:55,642 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-11-30 03:01:55,643 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-11-30 03:01:55,643 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=75, Unknown=0, NotChecked=0, Total=110 [2020-11-30 03:01:55,643 INFO L87 Difference]: Start difference. First operand 38 states and 42 transitions. Second operand 5 states. [2020-11-30 03:01:55,890 WARN L193 SmtUtils]: Spent 217.00 ms on a formula simplification. DAG size of input: 74 DAG size of output: 69 [2020-11-30 03:01:56,156 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-30 03:01:56,157 INFO L93 Difference]: Finished difference Result 73 states and 82 transitions. [2020-11-30 03:01:56,157 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-11-30 03:01:56,157 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 6 [2020-11-30 03:01:56,158 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-30 03:01:56,160 INFO L225 Difference]: With dead ends: 73 [2020-11-30 03:01:56,160 INFO L226 Difference]: Without dead ends: 73 [2020-11-30 03:01:56,160 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 9 SyntacticMatches, 2 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=41, Invalid=91, Unknown=0, NotChecked=0, Total=132 [2020-11-30 03:01:56,161 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73 states. [2020-11-30 03:01:56,166 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73 to 43. [2020-11-30 03:01:56,166 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2020-11-30 03:01:56,167 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 48 transitions. [2020-11-30 03:01:56,167 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 48 transitions. Word has length 6 [2020-11-30 03:01:56,167 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-30 03:01:56,167 INFO L481 AbstractCegarLoop]: Abstraction has 43 states and 48 transitions. [2020-11-30 03:01:56,167 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-11-30 03:01:56,167 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 48 transitions. [2020-11-30 03:01:56,168 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2020-11-30 03:01:56,168 INFO L414 BasicCegarLoop]: Found error trace [2020-11-30 03:01:56,168 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-30 03:01:56,368 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable23 [2020-11-30 03:01:56,369 INFO L429 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr12REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr11REQUIRES_VIOLATION, ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr21REQUIRES_VIOLATION, ULTIMATE.startErr10REQUIRES_VIOLATION, ULTIMATE.startErr15REQUIRES_VIOLATION, ULTIMATE.startErr4REQUIRES_VIOLATION, ULTIMATE.startErr14REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION, ULTIMATE.startErr13REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr7REQUIRES_VIOLATION, ULTIMATE.startErr17REQUIRES_VIOLATION, ULTIMATE.startErr6REQUIRES_VIOLATION, ULTIMATE.startErr16REQUIRES_VIOLATION, ULTIMATE.startErr5REQUIRES_VIOLATION, ULTIMATE.startErr20REQUIRES_VIOLATION, ULTIMATE.startErr9REQUIRES_VIOLATION, ULTIMATE.startErr19REQUIRES_VIOLATION, ULTIMATE.startErr8REQUIRES_VIOLATION, ULTIMATE.startErr18REQUIRES_VIOLATION, ULTIMATE.startErr22ASSERT_VIOLATIONMEMORY_LEAK]=== [2020-11-30 03:01:56,369 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-30 03:01:56,369 INFO L82 PathProgramCache]: Analyzing trace with hash -2120707428, now seen corresponding path program 1 times [2020-11-30 03:01:56,370 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-11-30 03:01:56,370 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [196913690] [2020-11-30 03:01:56,370 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-30 03:01:56,391 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-11-30 03:01:56,391 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-11-30 03:01:56,411 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-11-30 03:01:56,411 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-11-30 03:01:56,429 INFO L173 FreeRefinementEngine]: Strategy SIFA_TAIPAN found a feasible trace [2020-11-30 03:01:56,429 INFO L523 BasicCegarLoop]: Counterexample might be feasible [2020-11-30 03:01:56,429 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable48 [2020-11-30 03:01:56,454 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 30.11 03:01:56 BoogieIcfgContainer [2020-11-30 03:01:56,454 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-11-30 03:01:56,455 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2020-11-30 03:01:56,455 INFO L271 PluginConnector]: Initializing Witness Printer... [2020-11-30 03:01:56,455 INFO L275 PluginConnector]: Witness Printer initialized [2020-11-30 03:01:56,456 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 30.11 03:01:50" (3/4) ... [2020-11-30 03:01:56,459 INFO L131 WitnessPrinter]: Generating witness for reachability counterexample [2020-11-30 03:01:56,508 INFO L141 WitnessManager]: Wrote witness to /tmp/vcloud-vcloud-master/worker/run_dir_47cc7f5c-0c77-4807-afe8-5aef1aa8f54e/bin/utaipan/witness.graphml [2020-11-30 03:01:56,508 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2020-11-30 03:01:56,509 INFO L168 Benchmark]: Toolchain (without parser) took 7558.84 ms. Allocated memory was 94.4 MB in the beginning and 138.4 MB in the end (delta: 44.0 MB). Free memory was 58.1 MB in the beginning and 63.6 MB in the end (delta: -5.6 MB). Peak memory consumption was 37.2 MB. Max. memory is 16.1 GB. [2020-11-30 03:01:56,510 INFO L168 Benchmark]: CDTParser took 0.27 ms. Allocated memory is still 94.4 MB. Free memory was 75.2 MB in the beginning and 75.2 MB in the end (delta: 70.6 kB). There was no memory consumed. Max. memory is 16.1 GB. [2020-11-30 03:01:56,510 INFO L168 Benchmark]: CACSL2BoogieTranslator took 667.03 ms. Allocated memory is still 94.4 MB. Free memory was 57.8 MB in the beginning and 59.9 MB in the end (delta: -2.0 MB). Peak memory consumption was 8.4 MB. Max. memory is 16.1 GB. [2020-11-30 03:01:56,511 INFO L168 Benchmark]: Boogie Procedure Inliner took 87.13 ms. Allocated memory is still 94.4 MB. Free memory was 59.9 MB in the beginning and 58.0 MB in the end (delta: 1.9 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2020-11-30 03:01:56,511 INFO L168 Benchmark]: Boogie Preprocessor took 64.41 ms. Allocated memory is still 94.4 MB. Free memory was 58.0 MB in the beginning and 56.7 MB in the end (delta: 1.3 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2020-11-30 03:01:56,512 INFO L168 Benchmark]: RCFGBuilder took 1217.01 ms. Allocated memory was 94.4 MB in the beginning and 115.3 MB in the end (delta: 21.0 MB). Free memory was 56.7 MB in the beginning and 82.6 MB in the end (delta: -25.9 MB). Peak memory consumption was 31.5 MB. Max. memory is 16.1 GB. [2020-11-30 03:01:56,512 INFO L168 Benchmark]: TraceAbstraction took 5460.77 ms. Allocated memory was 115.3 MB in the beginning and 138.4 MB in the end (delta: 23.1 MB). Free memory was 82.1 MB in the beginning and 64.7 MB in the end (delta: 17.4 MB). Peak memory consumption was 41.6 MB. Max. memory is 16.1 GB. [2020-11-30 03:01:56,512 INFO L168 Benchmark]: Witness Printer took 53.56 ms. Allocated memory is still 138.4 MB. Free memory was 64.7 MB in the beginning and 63.6 MB in the end (delta: 1.0 MB). There was no memory consumed. Max. memory is 16.1 GB. [2020-11-30 03:01:56,515 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.27 ms. Allocated memory is still 94.4 MB. Free memory was 75.2 MB in the beginning and 75.2 MB in the end (delta: 70.6 kB). There was no memory consumed. Max. memory is 16.1 GB. * CACSL2BoogieTranslator took 667.03 ms. Allocated memory is still 94.4 MB. Free memory was 57.8 MB in the beginning and 59.9 MB in the end (delta: -2.0 MB). Peak memory consumption was 8.4 MB. Max. memory is 16.1 GB. * Boogie Procedure Inliner took 87.13 ms. Allocated memory is still 94.4 MB. Free memory was 59.9 MB in the beginning and 58.0 MB in the end (delta: 1.9 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. * Boogie Preprocessor took 64.41 ms. Allocated memory is still 94.4 MB. Free memory was 58.0 MB in the beginning and 56.7 MB in the end (delta: 1.3 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. * RCFGBuilder took 1217.01 ms. Allocated memory was 94.4 MB in the beginning and 115.3 MB in the end (delta: 21.0 MB). Free memory was 56.7 MB in the beginning and 82.6 MB in the end (delta: -25.9 MB). Peak memory consumption was 31.5 MB. Max. memory is 16.1 GB. * TraceAbstraction took 5460.77 ms. Allocated memory was 115.3 MB in the beginning and 138.4 MB in the end (delta: 23.1 MB). Free memory was 82.1 MB in the beginning and 64.7 MB in the end (delta: 17.4 MB). Peak memory consumption was 41.6 MB. Max. memory is 16.1 GB. * Witness Printer took 53.56 ms. Allocated memory is still 138.4 MB. Free memory was 64.7 MB in the beginning and 63.6 MB in the end (delta: 1.0 MB). There was no memory consumed. Max. memory is 16.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 529]: pointer dereference may fail pointer dereference may fail We found a FailurePath: [L515] int i, j, tmp; [L516] int length = __VERIFIER_nondet_int(); [L517] COND FALSE !(length < 1) [L518] COND FALSE !(length % 2 == 0) [L519] int *arr = __builtin_alloca (length*sizeof(int)); [L521] int i = 0; [L521] COND TRUE i < length [L523] arr[i] = __VERIFIER_nondet_int() [L521] i++ [L521] COND FALSE !(i < length) [L526] i=0 [L526] COND TRUE i