./Ultimate.py --spec ../../sv-benchmarks/c/properties/valid-memsafety.prp --file ../../sv-benchmarks/c/termination-15/cstrchr_malloc.i --full-output --architecture 64bit -------------------------------------------------------------------------------- Checking for memory safety (deref-memtrack) Using default analysis Version e04fb08f Calling Ultimate with: /usr/lib/jvm/java-1.11.0-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_361757dd-0935-42ba-8646-d7071cd1efc7/bin/utaipan-Xvt2sAort0/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_361757dd-0935-42ba-8646-d7071cd1efc7/bin/utaipan-Xvt2sAort0/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_361757dd-0935-42ba-8646-d7071cd1efc7/bin/utaipan-Xvt2sAort0/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_361757dd-0935-42ba-8646-d7071cd1efc7/bin/utaipan-Xvt2sAort0/config/TaipanMemDerefMemtrack.xml -i ../../sv-benchmarks/c/termination-15/cstrchr_malloc.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_361757dd-0935-42ba-8646-d7071cd1efc7/bin/utaipan-Xvt2sAort0/config/svcomp-DerefFreeMemtrack-64bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_361757dd-0935-42ba-8646-d7071cd1efc7/bin/utaipan-Xvt2sAort0 --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 64bit --witnessprinter.graph.data.programhash c0210ef89ad3c98ea9fece5cf50381a477e80228bc6d486133df1f853ef1ed9e --- Real Ultimate output --- [0.001s][warning][os,container] Duplicate cpuset controllers detected. Picking /sys/fs/cgroup/cpuset, skipping /sys/fs/cgroup/cpuset. This is Ultimate 0.2.2-dev-e04fb08 [2022-11-16 19:43:22,636 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-11-16 19:43:22,638 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-11-16 19:43:22,671 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-11-16 19:43:22,672 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-11-16 19:43:22,673 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-11-16 19:43:22,674 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-11-16 19:43:22,676 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-11-16 19:43:22,678 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-11-16 19:43:22,679 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-11-16 19:43:22,680 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-11-16 19:43:22,689 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-11-16 19:43:22,690 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-11-16 19:43:22,696 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-11-16 19:43:22,699 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-11-16 19:43:22,701 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-11-16 19:43:22,703 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-11-16 19:43:22,705 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-11-16 19:43:22,711 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-11-16 19:43:22,714 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-11-16 19:43:22,716 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-11-16 19:43:22,720 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-11-16 19:43:22,721 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-11-16 19:43:22,723 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-11-16 19:43:22,728 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-11-16 19:43:22,733 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-11-16 19:43:22,734 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-11-16 19:43:22,735 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-11-16 19:43:22,736 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-11-16 19:43:22,737 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-11-16 19:43:22,738 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-11-16 19:43:22,739 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-11-16 19:43:22,741 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-11-16 19:43:22,743 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-11-16 19:43:22,744 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-11-16 19:43:22,744 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-11-16 19:43:22,745 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-11-16 19:43:22,745 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-11-16 19:43:22,746 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-11-16 19:43:22,746 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-11-16 19:43:22,747 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-11-16 19:43:22,748 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_361757dd-0935-42ba-8646-d7071cd1efc7/bin/utaipan-Xvt2sAort0/config/svcomp-DerefFreeMemtrack-64bit-Taipan_Default.epf [2022-11-16 19:43:22,791 INFO L113 SettingsManager]: Loading preferences was successful [2022-11-16 19:43:22,791 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-11-16 19:43:22,792 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2022-11-16 19:43:22,792 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2022-11-16 19:43:22,793 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-11-16 19:43:22,793 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-11-16 19:43:22,793 INFO L138 SettingsManager]: * User list type=DISABLED [2022-11-16 19:43:22,793 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2022-11-16 19:43:22,794 INFO L138 SettingsManager]: * Explicit value domain=true [2022-11-16 19:43:22,794 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2022-11-16 19:43:22,794 INFO L138 SettingsManager]: * Octagon Domain=false [2022-11-16 19:43:22,794 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2022-11-16 19:43:22,794 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2022-11-16 19:43:22,794 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2022-11-16 19:43:22,795 INFO L138 SettingsManager]: * Interval Domain=false [2022-11-16 19:43:22,795 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2022-11-16 19:43:22,795 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2022-11-16 19:43:22,795 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2022-11-16 19:43:22,796 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2022-11-16 19:43:22,796 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2022-11-16 19:43:22,796 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-11-16 19:43:22,796 INFO L138 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2022-11-16 19:43:22,796 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-11-16 19:43:22,797 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-11-16 19:43:22,797 INFO L138 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2022-11-16 19:43:22,797 INFO L138 SettingsManager]: * Bitprecise bitfields=true [2022-11-16 19:43:22,797 INFO L138 SettingsManager]: * SV-COMP memtrack compatibility mode=true [2022-11-16 19:43:22,797 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-11-16 19:43:22,797 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2022-11-16 19:43:22,798 INFO L138 SettingsManager]: * Use constant arrays=true [2022-11-16 19:43:22,798 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-11-16 19:43:22,798 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-11-16 19:43:22,798 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-16 19:43:22,798 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-11-16 19:43:22,798 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2022-11-16 19:43:22,798 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-11-16 19:43:22,799 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2022-11-16 19:43:22,799 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2022-11-16 19:43:22,799 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2022-11-16 19:43:22,799 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:/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_361757dd-0935-42ba-8646-d7071cd1efc7/bin/utaipan-Xvt2sAort0/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_361757dd-0935-42ba-8646-d7071cd1efc7/bin/utaipan-Xvt2sAort0 Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 64bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> c0210ef89ad3c98ea9fece5cf50381a477e80228bc6d486133df1f853ef1ed9e [2022-11-16 19:43:23,093 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-11-16 19:43:23,114 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-11-16 19:43:23,117 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-11-16 19:43:23,118 INFO L271 PluginConnector]: Initializing CDTParser... [2022-11-16 19:43:23,119 INFO L275 PluginConnector]: CDTParser initialized [2022-11-16 19:43:23,120 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_361757dd-0935-42ba-8646-d7071cd1efc7/bin/utaipan-Xvt2sAort0/../../sv-benchmarks/c/termination-15/cstrchr_malloc.i [2022-11-16 19:43:23,201 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_361757dd-0935-42ba-8646-d7071cd1efc7/bin/utaipan-Xvt2sAort0/data/cf3814200/b477ebf576b045c18f5f8f825b08115d/FLAGf2c8333b7 [2022-11-16 19:43:23,720 INFO L306 CDTParser]: Found 1 translation units. [2022-11-16 19:43:23,721 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_361757dd-0935-42ba-8646-d7071cd1efc7/sv-benchmarks/c/termination-15/cstrchr_malloc.i [2022-11-16 19:43:23,729 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_361757dd-0935-42ba-8646-d7071cd1efc7/bin/utaipan-Xvt2sAort0/data/cf3814200/b477ebf576b045c18f5f8f825b08115d/FLAGf2c8333b7 [2022-11-16 19:43:24,024 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_361757dd-0935-42ba-8646-d7071cd1efc7/bin/utaipan-Xvt2sAort0/data/cf3814200/b477ebf576b045c18f5f8f825b08115d [2022-11-16 19:43:24,026 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-11-16 19:43:24,028 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2022-11-16 19:43:24,029 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-11-16 19:43:24,030 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-11-16 19:43:24,039 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-11-16 19:43:24,039 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 16.11 07:43:24" (1/1) ... [2022-11-16 19:43:24,041 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@7e518596 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.11 07:43:24, skipping insertion in model container [2022-11-16 19:43:24,041 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 16.11 07:43:24" (1/1) ... [2022-11-16 19:43:24,053 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-11-16 19:43:24,097 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-11-16 19:43:24,490 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-16 19:43:24,500 INFO L203 MainTranslator]: Completed pre-run [2022-11-16 19:43:24,560 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-16 19:43:24,595 INFO L208 MainTranslator]: Completed translation [2022-11-16 19:43:24,596 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.11 07:43:24 WrapperNode [2022-11-16 19:43:24,596 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-11-16 19:43:24,597 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2022-11-16 19:43:24,597 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2022-11-16 19:43:24,597 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2022-11-16 19:43:24,605 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.11 07:43:24" (1/1) ... [2022-11-16 19:43:24,629 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.11 07:43:24" (1/1) ... [2022-11-16 19:43:24,654 INFO L138 Inliner]: procedures = 152, calls = 9, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 48 [2022-11-16 19:43:24,654 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2022-11-16 19:43:24,658 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-11-16 19:43:24,658 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-11-16 19:43:24,659 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-11-16 19:43:24,669 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.11 07:43:24" (1/1) ... [2022-11-16 19:43:24,669 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.11 07:43:24" (1/1) ... [2022-11-16 19:43:24,688 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.11 07:43:24" (1/1) ... [2022-11-16 19:43:24,688 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.11 07:43:24" (1/1) ... [2022-11-16 19:43:24,692 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.11 07:43:24" (1/1) ... [2022-11-16 19:43:24,696 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.11 07:43:24" (1/1) ... [2022-11-16 19:43:24,697 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.11 07:43:24" (1/1) ... [2022-11-16 19:43:24,698 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.11 07:43:24" (1/1) ... [2022-11-16 19:43:24,699 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-11-16 19:43:24,700 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-11-16 19:43:24,700 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-11-16 19:43:24,701 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-11-16 19:43:24,711 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.11 07:43:24" (1/1) ... [2022-11-16 19:43:24,718 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-16 19:43:24,726 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_361757dd-0935-42ba-8646-d7071cd1efc7/bin/utaipan-Xvt2sAort0/z3 [2022-11-16 19:43:24,738 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_361757dd-0935-42ba-8646-d7071cd1efc7/bin/utaipan-Xvt2sAort0/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-11-16 19:43:24,740 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_361757dd-0935-42ba-8646-d7071cd1efc7/bin/utaipan-Xvt2sAort0/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-11-16 19:43:24,790 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2022-11-16 19:43:24,791 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2022-11-16 19:43:24,791 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2022-11-16 19:43:24,793 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2022-11-16 19:43:24,793 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-11-16 19:43:24,793 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-11-16 19:43:24,934 INFO L235 CfgBuilder]: Building ICFG [2022-11-16 19:43:24,936 INFO L261 CfgBuilder]: Building CFG for each procedure with an implementation [2022-11-16 19:43:25,214 INFO L276 CfgBuilder]: Performing block encoding [2022-11-16 19:43:25,280 INFO L295 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-11-16 19:43:25,280 INFO L300 CfgBuilder]: Removed 1 assume(true) statements. [2022-11-16 19:43:25,283 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 16.11 07:43:25 BoogieIcfgContainer [2022-11-16 19:43:25,283 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-11-16 19:43:25,285 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-11-16 19:43:25,286 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-11-16 19:43:25,289 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-11-16 19:43:25,290 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 16.11 07:43:24" (1/3) ... [2022-11-16 19:43:25,290 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@21489ac0 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 16.11 07:43:25, skipping insertion in model container [2022-11-16 19:43:25,291 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.11 07:43:24" (2/3) ... [2022-11-16 19:43:25,291 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@21489ac0 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 16.11 07:43:25, skipping insertion in model container [2022-11-16 19:43:25,291 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 16.11 07:43:25" (3/3) ... [2022-11-16 19:43:25,293 INFO L112 eAbstractionObserver]: Analyzing ICFG cstrchr_malloc.i [2022-11-16 19:43:25,313 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2022-11-16 19:43:25,313 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 12 error locations. [2022-11-16 19:43:25,362 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-11-16 19:43:25,371 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=false, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=All, 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;@32c8f473, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2022-11-16 19:43:25,372 INFO L358 AbstractCegarLoop]: Starting to check reachability of 12 error locations. [2022-11-16 19:43:25,377 INFO L276 IsEmpty]: Start isEmpty. Operand has 24 states, 11 states have (on average 2.3636363636363638) internal successors, (26), 23 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 19:43:25,385 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 3 [2022-11-16 19:43:25,386 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 19:43:25,386 INFO L195 NwaCegarLoop]: trace histogram [1, 1] [2022-11-16 19:43:25,387 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 9 more)] === [2022-11-16 19:43:25,396 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 19:43:25,396 INFO L85 PathProgramCache]: Analyzing trace with hash 2987, now seen corresponding path program 1 times [2022-11-16 19:43:25,408 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 19:43:25,409 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [163151185] [2022-11-16 19:43:25,409 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 19:43:25,410 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 19:43:25,532 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 19:43:25,657 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 19:43:25,657 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 19:43:25,658 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [163151185] [2022-11-16 19:43:25,658 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [163151185] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-16 19:43:25,659 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-16 19:43:25,659 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2022-11-16 19:43:25,661 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [772466134] [2022-11-16 19:43:25,662 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-16 19:43:25,666 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-16 19:43:25,666 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 19:43:25,710 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-16 19:43:25,712 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-16 19:43:25,714 INFO L87 Difference]: Start difference. First operand has 24 states, 11 states have (on average 2.3636363636363638) internal successors, (26), 23 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 3 states, 2 states have (on average 1.0) internal successors, (2), 2 states have internal predecessors, (2), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 19:43:25,798 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 19:43:25,798 INFO L93 Difference]: Finished difference Result 22 states and 23 transitions. [2022-11-16 19:43:25,800 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-16 19:43:25,806 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 1.0) internal successors, (2), 2 states have internal predecessors, (2), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 2 [2022-11-16 19:43:25,806 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 19:43:25,813 INFO L225 Difference]: With dead ends: 22 [2022-11-16 19:43:25,814 INFO L226 Difference]: Without dead ends: 21 [2022-11-16 19:43:25,816 INFO L412 NwaCegarLoop]: 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 [2022-11-16 19:43:25,819 INFO L413 NwaCegarLoop]: 10 mSDtfsCounter, 19 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 16 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 19 SdHoareTripleChecker+Valid, 10 SdHoareTripleChecker+Invalid, 17 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 16 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-16 19:43:25,821 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [19 Valid, 10 Invalid, 17 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 16 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-16 19:43:25,841 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2022-11-16 19:43:25,851 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2022-11-16 19:43:25,853 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 21 states, 11 states have (on average 2.0) internal successors, (22), 20 states have internal predecessors, (22), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 19:43:25,854 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 22 transitions. [2022-11-16 19:43:25,856 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 22 transitions. Word has length 2 [2022-11-16 19:43:25,856 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 19:43:25,856 INFO L495 AbstractCegarLoop]: Abstraction has 21 states and 22 transitions. [2022-11-16 19:43:25,856 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 1.0) internal successors, (2), 2 states have internal predecessors, (2), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 19:43:25,859 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 22 transitions. [2022-11-16 19:43:25,859 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 3 [2022-11-16 19:43:25,859 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 19:43:25,860 INFO L195 NwaCegarLoop]: trace histogram [1, 1] [2022-11-16 19:43:25,860 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-11-16 19:43:25,861 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 9 more)] === [2022-11-16 19:43:25,862 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 19:43:25,862 INFO L85 PathProgramCache]: Analyzing trace with hash 2988, now seen corresponding path program 1 times [2022-11-16 19:43:25,862 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 19:43:25,863 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1165177644] [2022-11-16 19:43:25,864 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 19:43:25,864 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 19:43:25,892 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 19:43:26,064 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 19:43:26,065 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 19:43:26,065 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1165177644] [2022-11-16 19:43:26,065 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1165177644] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-16 19:43:26,065 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-16 19:43:26,066 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2022-11-16 19:43:26,066 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1865188586] [2022-11-16 19:43:26,066 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-16 19:43:26,067 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-16 19:43:26,067 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 19:43:26,068 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-16 19:43:26,068 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-16 19:43:26,068 INFO L87 Difference]: Start difference. First operand 21 states and 22 transitions. Second operand has 3 states, 2 states have (on average 1.0) internal successors, (2), 2 states have internal predecessors, (2), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 19:43:26,099 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 19:43:26,100 INFO L93 Difference]: Finished difference Result 19 states and 20 transitions. [2022-11-16 19:43:26,100 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-16 19:43:26,101 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 1.0) internal successors, (2), 2 states have internal predecessors, (2), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 2 [2022-11-16 19:43:26,101 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 19:43:26,101 INFO L225 Difference]: With dead ends: 19 [2022-11-16 19:43:26,101 INFO L226 Difference]: Without dead ends: 19 [2022-11-16 19:43:26,102 INFO L412 NwaCegarLoop]: 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 [2022-11-16 19:43:26,103 INFO L413 NwaCegarLoop]: 8 mSDtfsCounter, 19 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 12 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 19 SdHoareTripleChecker+Valid, 8 SdHoareTripleChecker+Invalid, 13 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 12 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-16 19:43:26,104 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [19 Valid, 8 Invalid, 13 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 12 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-16 19:43:26,105 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2022-11-16 19:43:26,106 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2022-11-16 19:43:26,107 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19 states, 11 states have (on average 1.8181818181818181) internal successors, (20), 18 states have internal predecessors, (20), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 19:43:26,107 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 20 transitions. [2022-11-16 19:43:26,108 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 20 transitions. Word has length 2 [2022-11-16 19:43:26,108 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 19:43:26,108 INFO L495 AbstractCegarLoop]: Abstraction has 19 states and 20 transitions. [2022-11-16 19:43:26,108 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 1.0) internal successors, (2), 2 states have internal predecessors, (2), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 19:43:26,109 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 20 transitions. [2022-11-16 19:43:26,109 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2022-11-16 19:43:26,109 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 19:43:26,109 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1] [2022-11-16 19:43:26,110 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2022-11-16 19:43:26,110 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 9 more)] === [2022-11-16 19:43:26,111 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 19:43:26,111 INFO L85 PathProgramCache]: Analyzing trace with hash 94042, now seen corresponding path program 1 times [2022-11-16 19:43:26,111 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 19:43:26,111 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1383684734] [2022-11-16 19:43:26,112 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 19:43:26,112 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 19:43:26,128 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 19:43:26,206 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 19:43:26,206 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 19:43:26,206 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1383684734] [2022-11-16 19:43:26,207 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1383684734] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-16 19:43:26,208 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-16 19:43:26,208 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2022-11-16 19:43:26,208 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [988214313] [2022-11-16 19:43:26,210 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-16 19:43:26,210 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-16 19:43:26,210 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 19:43:26,211 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-16 19:43:26,212 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-16 19:43:26,212 INFO L87 Difference]: Start difference. First operand 19 states and 20 transitions. Second operand has 3 states, 2 states have (on average 1.5) internal successors, (3), 3 states have internal predecessors, (3), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 19:43:26,250 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 19:43:26,250 INFO L93 Difference]: Finished difference Result 16 states and 17 transitions. [2022-11-16 19:43:26,250 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-16 19:43:26,250 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 1.5) internal successors, (3), 3 states have internal predecessors, (3), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 3 [2022-11-16 19:43:26,251 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 19:43:26,251 INFO L225 Difference]: With dead ends: 16 [2022-11-16 19:43:26,251 INFO L226 Difference]: Without dead ends: 16 [2022-11-16 19:43:26,251 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-16 19:43:26,253 INFO L413 NwaCegarLoop]: 7 mSDtfsCounter, 12 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 13 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 12 SdHoareTripleChecker+Valid, 7 SdHoareTripleChecker+Invalid, 16 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 13 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-16 19:43:26,253 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [12 Valid, 7 Invalid, 16 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 13 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-16 19:43:26,254 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2022-11-16 19:43:26,255 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2022-11-16 19:43:26,256 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 16 states, 11 states have (on average 1.5454545454545454) internal successors, (17), 15 states have internal predecessors, (17), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 19:43:26,256 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 17 transitions. [2022-11-16 19:43:26,256 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 17 transitions. Word has length 3 [2022-11-16 19:43:26,256 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 19:43:26,257 INFO L495 AbstractCegarLoop]: Abstraction has 16 states and 17 transitions. [2022-11-16 19:43:26,257 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 1.5) internal successors, (3), 3 states have internal predecessors, (3), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 19:43:26,257 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 17 transitions. [2022-11-16 19:43:26,257 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2022-11-16 19:43:26,257 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 19:43:26,257 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1] [2022-11-16 19:43:26,258 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2022-11-16 19:43:26,258 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 9 more)] === [2022-11-16 19:43:26,258 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 19:43:26,259 INFO L85 PathProgramCache]: Analyzing trace with hash 94043, now seen corresponding path program 1 times [2022-11-16 19:43:26,259 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 19:43:26,259 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1056795456] [2022-11-16 19:43:26,259 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 19:43:26,259 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 19:43:26,270 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 19:43:26,347 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 19:43:26,347 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 19:43:26,347 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1056795456] [2022-11-16 19:43:26,347 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1056795456] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-16 19:43:26,348 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-16 19:43:26,348 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2022-11-16 19:43:26,348 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2088813079] [2022-11-16 19:43:26,348 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-16 19:43:26,349 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-11-16 19:43:26,349 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 19:43:26,349 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-11-16 19:43:26,350 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-11-16 19:43:26,350 INFO L87 Difference]: Start difference. First operand 16 states and 17 transitions. Second operand has 4 states, 3 states have (on average 1.0) internal successors, (3), 3 states have internal predecessors, (3), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 19:43:26,401 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 19:43:26,402 INFO L93 Difference]: Finished difference Result 27 states and 29 transitions. [2022-11-16 19:43:26,402 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-11-16 19:43:26,402 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 1.0) internal successors, (3), 3 states have internal predecessors, (3), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 3 [2022-11-16 19:43:26,402 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 19:43:26,405 INFO L225 Difference]: With dead ends: 27 [2022-11-16 19:43:26,406 INFO L226 Difference]: Without dead ends: 27 [2022-11-16 19:43:26,406 INFO L412 NwaCegarLoop]: 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 [2022-11-16 19:43:26,412 INFO L413 NwaCegarLoop]: 10 mSDtfsCounter, 39 mSDsluCounter, 7 mSDsCounter, 0 mSdLazyCounter, 16 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 39 SdHoareTripleChecker+Valid, 17 SdHoareTripleChecker+Invalid, 18 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 16 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-16 19:43:26,412 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [39 Valid, 17 Invalid, 18 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 16 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-16 19:43:26,413 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2022-11-16 19:43:26,415 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 21. [2022-11-16 19:43:26,415 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 21 states, 16 states have (on average 1.5) internal successors, (24), 20 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 19:43:26,416 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 24 transitions. [2022-11-16 19:43:26,416 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 24 transitions. Word has length 3 [2022-11-16 19:43:26,416 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 19:43:26,417 INFO L495 AbstractCegarLoop]: Abstraction has 21 states and 24 transitions. [2022-11-16 19:43:26,417 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 1.0) internal successors, (3), 3 states have internal predecessors, (3), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 19:43:26,417 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 24 transitions. [2022-11-16 19:43:26,417 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2022-11-16 19:43:26,417 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 19:43:26,418 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2022-11-16 19:43:26,418 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2022-11-16 19:43:26,418 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 9 more)] === [2022-11-16 19:43:26,418 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 19:43:26,419 INFO L85 PathProgramCache]: Analyzing trace with hash -1492110677, now seen corresponding path program 1 times [2022-11-16 19:43:26,419 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 19:43:26,419 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1964503122] [2022-11-16 19:43:26,419 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 19:43:26,419 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 19:43:26,452 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 19:43:26,485 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 19:43:26,486 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 19:43:26,486 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1964503122] [2022-11-16 19:43:26,486 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1964503122] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-16 19:43:26,486 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-16 19:43:26,486 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-11-16 19:43:26,487 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [367087231] [2022-11-16 19:43:26,487 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-16 19:43:26,488 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-16 19:43:26,489 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 19:43:26,490 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-16 19:43:26,490 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-16 19:43:26,490 INFO L87 Difference]: Start difference. First operand 21 states and 24 transitions. Second operand has 3 states, 3 states have (on average 2.0) internal successors, (6), 3 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 19:43:26,516 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 19:43:26,516 INFO L93 Difference]: Finished difference Result 23 states and 26 transitions. [2022-11-16 19:43:26,516 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-16 19:43:26,517 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.0) internal successors, (6), 3 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 6 [2022-11-16 19:43:26,517 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 19:43:26,518 INFO L225 Difference]: With dead ends: 23 [2022-11-16 19:43:26,519 INFO L226 Difference]: Without dead ends: 23 [2022-11-16 19:43:26,519 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-16 19:43:26,525 INFO L413 NwaCegarLoop]: 11 mSDtfsCounter, 0 mSDsluCounter, 8 mSDsCounter, 0 mSdLazyCounter, 14 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 19 SdHoareTripleChecker+Invalid, 14 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 14 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-16 19:43:26,526 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 19 Invalid, 14 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 14 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-16 19:43:26,528 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2022-11-16 19:43:26,532 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2022-11-16 19:43:26,535 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 23 states, 18 states have (on average 1.4444444444444444) internal successors, (26), 22 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 19:43:26,536 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 26 transitions. [2022-11-16 19:43:26,536 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 26 transitions. Word has length 6 [2022-11-16 19:43:26,536 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 19:43:26,537 INFO L495 AbstractCegarLoop]: Abstraction has 23 states and 26 transitions. [2022-11-16 19:43:26,537 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 2.0) internal successors, (6), 3 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 19:43:26,537 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 26 transitions. [2022-11-16 19:43:26,537 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2022-11-16 19:43:26,537 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 19:43:26,537 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2022-11-16 19:43:26,538 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2022-11-16 19:43:26,538 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 9 more)] === [2022-11-16 19:43:26,538 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 19:43:26,538 INFO L85 PathProgramCache]: Analyzing trace with hash 989055064, now seen corresponding path program 1 times [2022-11-16 19:43:26,539 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 19:43:26,539 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [239341353] [2022-11-16 19:43:26,539 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 19:43:26,539 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 19:43:26,576 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 19:43:27,034 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 19:43:27,035 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 19:43:27,035 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [239341353] [2022-11-16 19:43:27,035 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [239341353] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-16 19:43:27,035 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1012176608] [2022-11-16 19:43:27,035 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 19:43:27,036 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 19:43:27,036 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_361757dd-0935-42ba-8646-d7071cd1efc7/bin/utaipan-Xvt2sAort0/z3 [2022-11-16 19:43:27,044 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_361757dd-0935-42ba-8646-d7071cd1efc7/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-16 19:43:27,061 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_361757dd-0935-42ba-8646-d7071cd1efc7/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-11-16 19:43:27,120 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 19:43:27,122 INFO L263 TraceCheckSpWp]: Trace formula consists of 68 conjuncts, 26 conjunts are in the unsatisfiable core [2022-11-16 19:43:27,128 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-16 19:43:27,224 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 14 treesize of output 10 [2022-11-16 19:43:27,316 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-16 19:43:27,316 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 32 treesize of output 25 [2022-11-16 19:43:27,425 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 19:43:27,426 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-16 19:43:27,603 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-11-16 19:43:27,617 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 11 [2022-11-16 19:43:27,627 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 12 [2022-11-16 19:43:27,645 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 19:43:27,645 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1012176608] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-16 19:43:27,645 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [324199108] [2022-11-16 19:43:27,667 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2022-11-16 19:43:27,667 INFO L166 IcfgInterpreter]: Building call graph [2022-11-16 19:43:27,691 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-16 19:43:27,697 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-16 19:43:27,698 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-16 19:43:27,759 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 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 [2022-11-16 19:43:27,798 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-16 19:43:28,076 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-16 19:43:28,465 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '303#(and (<= |ULTIMATE.start_main_~length~0#1| 2147483647) (<= 0 (+ |ULTIMATE.start_main_#t~nondet212#1| 2147483648)) (<= 0 |ULTIMATE.start_cstrchr_#in~s#1.offset|) (< (select |#length| |ULTIMATE.start_cstrchr_~s#1.base|) (+ |ULTIMATE.start_cstrchr_~s#1.offset| 1)) (<= |ULTIMATE.start_cstrchr_~c#1| 2147483647) (<= |ULTIMATE.start_cstrchr_#in~s#1.offset| 0) (= |ULTIMATE.start_main_~nondetString~0#1.offset| 0) (<= |ULTIMATE.start_main_#t~nondet212#1| 2147483647) (<= 0 (+ |ULTIMATE.start_cstrchr_#in~c#1| 2147483648)) (<= 1 |ULTIMATE.start_main_~length~0#1|) (= |#NULL.offset| 0) (<= 0 (+ |ULTIMATE.start_cstrchr_~c#1| 2147483648)) (<= 0 |ULTIMATE.start_cstrchr_~s#1.offset|) (<= |ULTIMATE.start_cstrchr_#in~c#1| 2147483647) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-16 19:43:28,465 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-16 19:43:28,465 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-16 19:43:28,465 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 13 [2022-11-16 19:43:28,466 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1879011414] [2022-11-16 19:43:28,466 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-16 19:43:28,466 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2022-11-16 19:43:28,466 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 19:43:28,467 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2022-11-16 19:43:28,468 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=72, Invalid=308, Unknown=0, NotChecked=0, Total=380 [2022-11-16 19:43:28,468 INFO L87 Difference]: Start difference. First operand 23 states and 26 transitions. Second operand has 15 states, 14 states have (on average 1.3571428571428572) internal successors, (19), 14 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 19:43:28,733 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 19:43:28,733 INFO L93 Difference]: Finished difference Result 43 states and 46 transitions. [2022-11-16 19:43:28,734 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2022-11-16 19:43:28,734 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 14 states have (on average 1.3571428571428572) internal successors, (19), 14 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 7 [2022-11-16 19:43:28,734 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 19:43:28,734 INFO L225 Difference]: With dead ends: 43 [2022-11-16 19:43:28,735 INFO L226 Difference]: Without dead ends: 43 [2022-11-16 19:43:28,735 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 5 SyntacticMatches, 1 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 135 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=114, Invalid=486, Unknown=0, NotChecked=0, Total=600 [2022-11-16 19:43:28,739 INFO L413 NwaCegarLoop]: 21 mSDtfsCounter, 70 mSDsluCounter, 68 mSDsCounter, 0 mSdLazyCounter, 84 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 70 SdHoareTripleChecker+Valid, 89 SdHoareTripleChecker+Invalid, 99 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 84 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 4 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-16 19:43:28,740 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [70 Valid, 89 Invalid, 99 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 84 Invalid, 0 Unknown, 4 Unchecked, 0.1s Time] [2022-11-16 19:43:28,741 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2022-11-16 19:43:28,745 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 26. [2022-11-16 19:43:28,747 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26 states, 21 states have (on average 1.4285714285714286) internal successors, (30), 25 states have internal predecessors, (30), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 19:43:28,748 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 30 transitions. [2022-11-16 19:43:28,749 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 30 transitions. Word has length 7 [2022-11-16 19:43:28,750 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 19:43:28,750 INFO L495 AbstractCegarLoop]: Abstraction has 26 states and 30 transitions. [2022-11-16 19:43:28,750 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 14 states have (on average 1.3571428571428572) internal successors, (19), 14 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 19:43:28,750 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 30 transitions. [2022-11-16 19:43:28,751 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2022-11-16 19:43:28,751 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 19:43:28,752 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2022-11-16 19:43:28,758 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_361757dd-0935-42ba-8646-d7071cd1efc7/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2022-11-16 19:43:28,957 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_361757dd-0935-42ba-8646-d7071cd1efc7/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 19:43:28,957 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr9ASSERT_VIOLATIONMEMORY_FREE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 9 more)] === [2022-11-16 19:43:28,958 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 19:43:28,958 INFO L85 PathProgramCache]: Analyzing trace with hash 600695669, now seen corresponding path program 1 times [2022-11-16 19:43:28,958 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 19:43:28,958 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [649520191] [2022-11-16 19:43:28,958 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 19:43:28,958 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 19:43:28,968 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 19:43:28,984 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 19:43:28,984 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 19:43:28,984 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [649520191] [2022-11-16 19:43:28,984 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [649520191] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-16 19:43:28,985 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-16 19:43:28,985 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2022-11-16 19:43:28,985 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2071151702] [2022-11-16 19:43:28,985 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-16 19:43:28,985 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-16 19:43:28,986 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 19:43:28,986 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-16 19:43:28,986 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-16 19:43:28,986 INFO L87 Difference]: Start difference. First operand 26 states and 30 transitions. Second operand has 3 states, 2 states have (on average 4.0) internal successors, (8), 2 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 19:43:28,998 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 19:43:28,999 INFO L93 Difference]: Finished difference Result 25 states and 29 transitions. [2022-11-16 19:43:28,999 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-16 19:43:28,999 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 4.0) internal successors, (8), 2 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 8 [2022-11-16 19:43:28,999 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 19:43:29,000 INFO L225 Difference]: With dead ends: 25 [2022-11-16 19:43:29,000 INFO L226 Difference]: Without dead ends: 25 [2022-11-16 19:43:29,000 INFO L412 NwaCegarLoop]: 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 [2022-11-16 19:43:29,001 INFO L413 NwaCegarLoop]: 9 mSDtfsCounter, 9 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 7 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 9 SdHoareTripleChecker+Valid, 9 SdHoareTripleChecker+Invalid, 7 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 7 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-16 19:43:29,001 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [9 Valid, 9 Invalid, 7 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 7 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-16 19:43:29,002 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2022-11-16 19:43:29,003 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2022-11-16 19:43:29,003 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 25 states, 21 states have (on average 1.380952380952381) internal successors, (29), 24 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 19:43:29,004 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 29 transitions. [2022-11-16 19:43:29,004 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 29 transitions. Word has length 8 [2022-11-16 19:43:29,004 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 19:43:29,005 INFO L495 AbstractCegarLoop]: Abstraction has 25 states and 29 transitions. [2022-11-16 19:43:29,005 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 4.0) internal successors, (8), 2 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 19:43:29,005 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 29 transitions. [2022-11-16 19:43:29,005 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2022-11-16 19:43:29,005 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 19:43:29,005 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-16 19:43:29,006 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2022-11-16 19:43:29,006 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr11ASSERT_VIOLATIONMEMORY_LEAK === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 9 more)] === [2022-11-16 19:43:29,006 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 19:43:29,007 INFO L85 PathProgramCache]: Analyzing trace with hash 1742922840, now seen corresponding path program 1 times [2022-11-16 19:43:29,007 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 19:43:29,007 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1851455336] [2022-11-16 19:43:29,007 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 19:43:29,007 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 19:43:29,018 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 19:43:29,081 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 19:43:29,081 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 19:43:29,082 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1851455336] [2022-11-16 19:43:29,082 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1851455336] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-16 19:43:29,082 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-16 19:43:29,082 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2022-11-16 19:43:29,082 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [883581827] [2022-11-16 19:43:29,082 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-16 19:43:29,083 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-11-16 19:43:29,083 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 19:43:29,083 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-11-16 19:43:29,083 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-11-16 19:43:29,084 INFO L87 Difference]: Start difference. First operand 25 states and 29 transitions. Second operand has 4 states, 3 states have (on average 3.3333333333333335) internal successors, (10), 3 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 19:43:29,116 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 19:43:29,116 INFO L93 Difference]: Finished difference Result 24 states and 28 transitions. [2022-11-16 19:43:29,116 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-11-16 19:43:29,116 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 3.3333333333333335) internal successors, (10), 3 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 10 [2022-11-16 19:43:29,117 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 19:43:29,117 INFO L225 Difference]: With dead ends: 24 [2022-11-16 19:43:29,117 INFO L226 Difference]: Without dead ends: 18 [2022-11-16 19:43:29,117 INFO L412 NwaCegarLoop]: 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 [2022-11-16 19:43:29,118 INFO L413 NwaCegarLoop]: 8 mSDtfsCounter, 6 mSDsluCounter, 8 mSDsCounter, 0 mSdLazyCounter, 13 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 16 SdHoareTripleChecker+Invalid, 14 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 13 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-16 19:43:29,118 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [6 Valid, 16 Invalid, 14 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 13 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-16 19:43:29,119 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2022-11-16 19:43:29,120 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2022-11-16 19:43:29,120 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 18 states, 15 states have (on average 1.2) internal successors, (18), 17 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 19:43:29,120 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 18 transitions. [2022-11-16 19:43:29,120 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 18 transitions. Word has length 10 [2022-11-16 19:43:29,120 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 19:43:29,121 INFO L495 AbstractCegarLoop]: Abstraction has 18 states and 18 transitions. [2022-11-16 19:43:29,121 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 3.3333333333333335) internal successors, (10), 3 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 19:43:29,121 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 18 transitions. [2022-11-16 19:43:29,121 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2022-11-16 19:43:29,121 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 19:43:29,121 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1] [2022-11-16 19:43:29,122 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2022-11-16 19:43:29,122 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 9 more)] === [2022-11-16 19:43:29,122 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 19:43:29,122 INFO L85 PathProgramCache]: Analyzing trace with hash -1830331691, now seen corresponding path program 2 times [2022-11-16 19:43:29,122 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 19:43:29,123 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [306691039] [2022-11-16 19:43:29,123 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 19:43:29,123 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 19:43:29,139 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 19:43:29,662 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 19:43:29,662 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 19:43:29,662 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [306691039] [2022-11-16 19:43:29,663 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [306691039] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-16 19:43:29,663 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1025181558] [2022-11-16 19:43:29,663 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-16 19:43:29,663 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 19:43:29,664 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_361757dd-0935-42ba-8646-d7071cd1efc7/bin/utaipan-Xvt2sAort0/z3 [2022-11-16 19:43:29,665 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_361757dd-0935-42ba-8646-d7071cd1efc7/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-16 19:43:29,693 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_361757dd-0935-42ba-8646-d7071cd1efc7/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-11-16 19:43:29,755 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2022-11-16 19:43:29,755 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-16 19:43:29,757 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 32 conjunts are in the unsatisfiable core [2022-11-16 19:43:29,760 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-16 19:43:29,801 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 14 treesize of output 10 [2022-11-16 19:43:36,834 INFO L321 Elim1Store]: treesize reduction 8, result has 75.8 percent of original size [2022-11-16 19:43:36,835 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 27 treesize of output 36 [2022-11-16 19:43:36,938 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 19:43:36,938 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-16 19:43:37,393 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 27 treesize of output 23 [2022-11-16 19:43:37,402 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-11-16 19:43:37,426 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-16 19:43:37,426 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 43 treesize of output 47 [2022-11-16 19:43:37,461 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 19:43:37,461 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1025181558] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-16 19:43:37,461 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [767314103] [2022-11-16 19:43:37,465 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2022-11-16 19:43:37,465 INFO L166 IcfgInterpreter]: Building call graph [2022-11-16 19:43:37,466 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-16 19:43:37,466 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-16 19:43:37,466 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-16 19:43:37,490 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 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 [2022-11-16 19:43:37,515 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-16 19:43:37,728 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-16 19:43:38,211 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '573#(and (<= |ULTIMATE.start_main_~length~0#1| 2147483647) (<= 0 (+ |ULTIMATE.start_main_#t~nondet212#1| 2147483648)) (<= 0 |ULTIMATE.start_cstrchr_#in~s#1.offset|) (< (select |#length| |ULTIMATE.start_cstrchr_~s#1.base|) (+ |ULTIMATE.start_cstrchr_~s#1.offset| 1)) (<= |ULTIMATE.start_cstrchr_~c#1| 2147483647) (<= |ULTIMATE.start_cstrchr_#in~s#1.offset| 0) (= |ULTIMATE.start_main_~nondetString~0#1.offset| 0) (<= |ULTIMATE.start_main_#t~nondet212#1| 2147483647) (<= 0 (+ |ULTIMATE.start_cstrchr_#in~c#1| 2147483648)) (<= 1 |ULTIMATE.start_main_~length~0#1|) (= |#NULL.offset| 0) (<= 0 (+ |ULTIMATE.start_cstrchr_~c#1| 2147483648)) (<= 0 |ULTIMATE.start_cstrchr_~s#1.offset|) (<= |ULTIMATE.start_cstrchr_#in~c#1| 2147483647) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-16 19:43:38,212 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-16 19:43:38,212 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-16 19:43:38,212 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 9, 9] total 23 [2022-11-16 19:43:38,212 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1547530474] [2022-11-16 19:43:38,212 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-16 19:43:38,213 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2022-11-16 19:43:38,213 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 19:43:38,213 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2022-11-16 19:43:38,213 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=121, Invalid=746, Unknown=3, NotChecked=0, Total=870 [2022-11-16 19:43:38,214 INFO L87 Difference]: Start difference. First operand 18 states and 18 transitions. Second operand has 25 states, 24 states have (on average 1.3333333333333333) internal successors, (32), 24 states have internal predecessors, (32), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 19:43:41,338 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 19:43:41,338 INFO L93 Difference]: Finished difference Result 30 states and 30 transitions. [2022-11-16 19:43:41,338 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2022-11-16 19:43:41,339 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 24 states have (on average 1.3333333333333333) internal successors, (32), 24 states have internal predecessors, (32), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 11 [2022-11-16 19:43:41,339 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 19:43:41,339 INFO L225 Difference]: With dead ends: 30 [2022-11-16 19:43:41,339 INFO L226 Difference]: Without dead ends: 24 [2022-11-16 19:43:41,340 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 8 SyntacticMatches, 1 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 401 ImplicationChecksByTransitivity, 10.7s TimeCoverageRelationStatistics Valid=277, Invalid=1524, Unknown=5, NotChecked=0, Total=1806 [2022-11-16 19:43:41,341 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 26 mSDsluCounter, 11 mSDsCounter, 0 mSdLazyCounter, 100 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 26 SdHoareTripleChecker+Valid, 13 SdHoareTripleChecker+Invalid, 182 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 100 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 68 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-16 19:43:41,341 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [26 Valid, 13 Invalid, 182 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 100 Invalid, 0 Unknown, 68 Unchecked, 0.1s Time] [2022-11-16 19:43:41,342 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2022-11-16 19:43:41,343 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 23. [2022-11-16 19:43:41,343 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 23 states, 21 states have (on average 1.0952380952380953) internal successors, (23), 22 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 19:43:41,344 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 23 transitions. [2022-11-16 19:43:41,344 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 23 transitions. Word has length 11 [2022-11-16 19:43:41,344 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 19:43:41,345 INFO L495 AbstractCegarLoop]: Abstraction has 23 states and 23 transitions. [2022-11-16 19:43:41,345 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 24 states have (on average 1.3333333333333333) internal successors, (32), 24 states have internal predecessors, (32), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 19:43:41,345 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 23 transitions. [2022-11-16 19:43:41,346 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2022-11-16 19:43:41,346 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 19:43:41,346 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 4, 4, 1, 1, 1] [2022-11-16 19:43:41,351 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_361757dd-0935-42ba-8646-d7071cd1efc7/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2022-11-16 19:43:41,551 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_361757dd-0935-42ba-8646-d7071cd1efc7/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 19:43:41,552 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 9 more)] === [2022-11-16 19:43:41,552 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 19:43:41,552 INFO L85 PathProgramCache]: Analyzing trace with hash -347132849, now seen corresponding path program 3 times [2022-11-16 19:43:41,552 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 19:43:41,552 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1873836744] [2022-11-16 19:43:41,553 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 19:43:41,553 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 19:43:41,575 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 19:43:42,232 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 19:43:42,232 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 19:43:42,232 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1873836744] [2022-11-16 19:43:42,232 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1873836744] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-16 19:43:42,233 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1133122365] [2022-11-16 19:43:42,233 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-16 19:43:42,233 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 19:43:42,233 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_361757dd-0935-42ba-8646-d7071cd1efc7/bin/utaipan-Xvt2sAort0/z3 [2022-11-16 19:43:42,241 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_361757dd-0935-42ba-8646-d7071cd1efc7/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-16 19:43:42,257 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_361757dd-0935-42ba-8646-d7071cd1efc7/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-11-16 19:43:42,316 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-16 19:43:42,317 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-16 19:43:42,318 INFO L263 TraceCheckSpWp]: Trace formula consists of 128 conjuncts, 50 conjunts are in the unsatisfiable core [2022-11-16 19:43:42,321 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-16 19:43:42,345 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 14 treesize of output 10 [2022-11-16 19:43:43,151 INFO L321 Elim1Store]: treesize reduction 12, result has 65.7 percent of original size [2022-11-16 19:43:43,154 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 5 select indices, 5 select index equivalence classes, 6 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 55 treesize of output 51 [2022-11-16 19:43:43,295 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 19:43:43,296 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-16 19:43:44,202 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-11-16 19:43:44,209 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 59 treesize of output 51 [2022-11-16 19:43:44,218 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 4 select indices, 4 select index equivalence classes, 6 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 0 case distinctions, treesize of input 59 treesize of output 45 [2022-11-16 19:43:44,263 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 19:43:44,264 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1133122365] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-16 19:43:44,264 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1098785394] [2022-11-16 19:43:44,266 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2022-11-16 19:43:44,266 INFO L166 IcfgInterpreter]: Building call graph [2022-11-16 19:43:44,266 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-16 19:43:44,267 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-16 19:43:44,267 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-16 19:43:44,282 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 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 [2022-11-16 19:43:44,304 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-16 19:43:44,417 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-16 19:43:44,972 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '803#(and (<= |ULTIMATE.start_main_~length~0#1| 2147483647) (<= 0 (+ |ULTIMATE.start_main_#t~nondet212#1| 2147483648)) (<= 0 |ULTIMATE.start_cstrchr_#in~s#1.offset|) (< (select |#length| |ULTIMATE.start_cstrchr_~s#1.base|) (+ |ULTIMATE.start_cstrchr_~s#1.offset| 1)) (<= |ULTIMATE.start_cstrchr_~c#1| 2147483647) (<= |ULTIMATE.start_cstrchr_#in~s#1.offset| 0) (= |ULTIMATE.start_main_~nondetString~0#1.offset| 0) (<= |ULTIMATE.start_main_#t~nondet212#1| 2147483647) (<= 0 (+ |ULTIMATE.start_cstrchr_#in~c#1| 2147483648)) (<= 1 |ULTIMATE.start_main_~length~0#1|) (= |#NULL.offset| 0) (<= 0 (+ |ULTIMATE.start_cstrchr_~c#1| 2147483648)) (<= 0 |ULTIMATE.start_cstrchr_~s#1.offset|) (<= |ULTIMATE.start_cstrchr_#in~c#1| 2147483647) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-16 19:43:44,972 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-16 19:43:44,972 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-16 19:43:44,973 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 14, 14] total 36 [2022-11-16 19:43:44,973 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [116739109] [2022-11-16 19:43:44,973 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-16 19:43:44,973 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 38 states [2022-11-16 19:43:44,974 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 19:43:44,974 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2022-11-16 19:43:44,975 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=223, Invalid=1583, Unknown=0, NotChecked=0, Total=1806 [2022-11-16 19:43:44,975 INFO L87 Difference]: Start difference. First operand 23 states and 23 transitions. Second operand has 38 states, 37 states have (on average 1.5405405405405406) internal successors, (57), 37 states have internal predecessors, (57), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 19:43:46,575 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 19:43:46,576 INFO L93 Difference]: Finished difference Result 40 states and 40 transitions. [2022-11-16 19:43:46,576 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2022-11-16 19:43:46,576 INFO L78 Accepts]: Start accepts. Automaton has has 38 states, 37 states have (on average 1.5405405405405406) internal successors, (57), 37 states have internal predecessors, (57), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 19 [2022-11-16 19:43:46,577 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 19:43:46,577 INFO L225 Difference]: With dead ends: 40 [2022-11-16 19:43:46,577 INFO L226 Difference]: Without dead ends: 40 [2022-11-16 19:43:46,579 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 83 GetRequests, 22 SyntacticMatches, 0 SemanticMatches, 61 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 938 ImplicationChecksByTransitivity, 3.2s TimeCoverageRelationStatistics Valid=503, Invalid=3403, Unknown=0, NotChecked=0, Total=3906 [2022-11-16 19:43:46,579 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 75 mSDsluCounter, 8 mSDsCounter, 0 mSdLazyCounter, 174 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 75 SdHoareTripleChecker+Valid, 10 SdHoareTripleChecker+Invalid, 218 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 174 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 31 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-16 19:43:46,580 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [75 Valid, 10 Invalid, 218 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 174 Invalid, 0 Unknown, 31 Unchecked, 0.2s Time] [2022-11-16 19:43:46,580 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2022-11-16 19:43:46,585 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 39. [2022-11-16 19:43:46,587 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 39 states, 37 states have (on average 1.054054054054054) internal successors, (39), 38 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 19:43:46,588 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 39 transitions. [2022-11-16 19:43:46,588 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 39 transitions. Word has length 19 [2022-11-16 19:43:46,589 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 19:43:46,589 INFO L495 AbstractCegarLoop]: Abstraction has 39 states and 39 transitions. [2022-11-16 19:43:46,589 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 38 states, 37 states have (on average 1.5405405405405406) internal successors, (57), 37 states have internal predecessors, (57), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 19:43:46,590 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 39 transitions. [2022-11-16 19:43:46,591 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2022-11-16 19:43:46,591 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 19:43:46,591 INFO L195 NwaCegarLoop]: trace histogram [8, 8, 8, 8, 1, 1, 1] [2022-11-16 19:43:46,601 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_361757dd-0935-42ba-8646-d7071cd1efc7/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Ended with exit code 0 [2022-11-16 19:43:46,792 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_361757dd-0935-42ba-8646-d7071cd1efc7/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2022-11-16 19:43:46,792 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 9 more)] === [2022-11-16 19:43:46,793 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 19:43:46,793 INFO L85 PathProgramCache]: Analyzing trace with hash 1032618307, now seen corresponding path program 4 times [2022-11-16 19:43:46,793 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 19:43:46,793 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [453281486] [2022-11-16 19:43:46,793 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 19:43:46,793 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 19:43:46,817 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 19:43:47,961 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 0 proven. 120 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 19:43:47,961 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 19:43:47,961 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [453281486] [2022-11-16 19:43:47,961 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [453281486] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-16 19:43:47,961 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1567642208] [2022-11-16 19:43:47,962 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-16 19:43:47,962 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 19:43:47,962 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_361757dd-0935-42ba-8646-d7071cd1efc7/bin/utaipan-Xvt2sAort0/z3 [2022-11-16 19:43:47,963 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_361757dd-0935-42ba-8646-d7071cd1efc7/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-16 19:43:47,985 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_361757dd-0935-42ba-8646-d7071cd1efc7/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2022-11-16 19:43:48,062 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 19:43:48,065 INFO L263 TraceCheckSpWp]: Trace formula consists of 208 conjuncts, 79 conjunts are in the unsatisfiable core [2022-11-16 19:43:48,068 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-16 19:43:48,110 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 14 treesize of output 10 [2022-11-16 19:43:51,418 INFO L321 Elim1Store]: treesize reduction 28, result has 68.5 percent of original size [2022-11-16 19:43:51,419 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 9 select indices, 9 select index equivalence classes, 28 disjoint index pairs (out of 36 index pairs), introduced 9 new quantified variables, introduced 8 case distinctions, treesize of input 102 treesize of output 105 [2022-11-16 19:43:51,457 WARN L718 sPolynomialRelations]: Constructing 128(two to the power of 7 dual juncts. [2022-11-16 19:43:51,480 WARN L718 sPolynomialRelations]: Constructing 256(two to the power of 8 dual juncts. [2022-11-16 19:43:51,743 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 0 proven. 120 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 19:43:51,743 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-16 19:43:55,120 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 119 treesize of output 103 [2022-11-16 19:43:55,145 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 8 select indices, 8 select index equivalence classes, 28 disjoint index pairs (out of 28 index pairs), introduced 8 new quantified variables, introduced 0 case distinctions, treesize of input 183 treesize of output 153 [2022-11-16 19:43:55,156 WARN L718 sPolynomialRelations]: Constructing 256(two to the power of 8 dual juncts. [2022-11-16 19:43:55,180 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 23 [2022-11-16 19:43:55,209 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 0 proven. 120 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 19:43:55,209 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1567642208] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-16 19:43:55,209 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [218472504] [2022-11-16 19:43:55,212 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2022-11-16 19:43:55,213 INFO L166 IcfgInterpreter]: Building call graph [2022-11-16 19:43:55,213 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-16 19:43:55,213 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-16 19:43:55,213 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-16 19:43:55,230 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 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 [2022-11-16 19:43:55,244 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-16 19:43:55,351 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-16 19:43:56,155 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1196#(and (<= |ULTIMATE.start_main_~length~0#1| 2147483647) (<= 0 (+ |ULTIMATE.start_main_#t~nondet212#1| 2147483648)) (<= 0 |ULTIMATE.start_cstrchr_#in~s#1.offset|) (< (select |#length| |ULTIMATE.start_cstrchr_~s#1.base|) (+ |ULTIMATE.start_cstrchr_~s#1.offset| 1)) (<= |ULTIMATE.start_cstrchr_~c#1| 2147483647) (<= |ULTIMATE.start_cstrchr_#in~s#1.offset| 0) (= |ULTIMATE.start_main_~nondetString~0#1.offset| 0) (<= |ULTIMATE.start_main_#t~nondet212#1| 2147483647) (<= 0 (+ |ULTIMATE.start_cstrchr_#in~c#1| 2147483648)) (<= 1 |ULTIMATE.start_main_~length~0#1|) (= |#NULL.offset| 0) (<= 0 (+ |ULTIMATE.start_cstrchr_~c#1| 2147483648)) (<= 0 |ULTIMATE.start_cstrchr_~s#1.offset|) (<= |ULTIMATE.start_cstrchr_#in~c#1| 2147483647) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-16 19:43:56,155 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-16 19:43:56,156 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-16 19:43:56,156 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 26, 26] total 63 [2022-11-16 19:43:56,156 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1407401102] [2022-11-16 19:43:56,156 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-16 19:43:56,157 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 65 states [2022-11-16 19:43:56,157 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 19:43:56,158 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 65 interpolants. [2022-11-16 19:43:56,159 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=558, Invalid=4272, Unknown=0, NotChecked=0, Total=4830 [2022-11-16 19:43:56,160 INFO L87 Difference]: Start difference. First operand 39 states and 39 transitions. Second operand has 65 states, 64 states have (on average 1.625) internal successors, (104), 64 states have internal predecessors, (104), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 19:44:02,577 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 19:44:02,577 INFO L93 Difference]: Finished difference Result 72 states and 72 transitions. [2022-11-16 19:44:02,577 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2022-11-16 19:44:02,578 INFO L78 Accepts]: Start accepts. Automaton has has 65 states, 64 states have (on average 1.625) internal successors, (104), 64 states have internal predecessors, (104), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 35 [2022-11-16 19:44:02,578 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 19:44:02,578 INFO L225 Difference]: With dead ends: 72 [2022-11-16 19:44:02,578 INFO L226 Difference]: Without dead ends: 72 [2022-11-16 19:44:02,583 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 165 GetRequests, 52 SyntacticMatches, 1 SemanticMatches, 112 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3209 ImplicationChecksByTransitivity, 11.9s TimeCoverageRelationStatistics Valid=1503, Invalid=11379, Unknown=0, NotChecked=0, Total=12882 [2022-11-16 19:44:02,583 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 146 mSDsluCounter, 5 mSDsCounter, 0 mSdLazyCounter, 288 mSolverCounterSat, 23 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 146 SdHoareTripleChecker+Valid, 7 SdHoareTripleChecker+Invalid, 384 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 23 IncrementalHoareTripleChecker+Valid, 288 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 73 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-16 19:44:02,584 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [146 Valid, 7 Invalid, 384 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [23 Valid, 288 Invalid, 0 Unknown, 73 Unchecked, 0.3s Time] [2022-11-16 19:44:02,584 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2022-11-16 19:44:02,587 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 71. [2022-11-16 19:44:02,588 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 71 states, 69 states have (on average 1.0289855072463767) internal successors, (71), 70 states have internal predecessors, (71), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 19:44:02,588 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 71 transitions. [2022-11-16 19:44:02,589 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 71 transitions. Word has length 35 [2022-11-16 19:44:02,589 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 19:44:02,589 INFO L495 AbstractCegarLoop]: Abstraction has 71 states and 71 transitions. [2022-11-16 19:44:02,589 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 65 states, 64 states have (on average 1.625) internal successors, (104), 64 states have internal predecessors, (104), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 19:44:02,590 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 71 transitions. [2022-11-16 19:44:02,591 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2022-11-16 19:44:02,591 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 19:44:02,591 INFO L195 NwaCegarLoop]: trace histogram [16, 16, 16, 16, 1, 1, 1] [2022-11-16 19:44:02,597 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_361757dd-0935-42ba-8646-d7071cd1efc7/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2022-11-16 19:44:02,796 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_361757dd-0935-42ba-8646-d7071cd1efc7/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2022-11-16 19:44:02,796 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 9 more)] === [2022-11-16 19:44:02,797 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 19:44:02,797 INFO L85 PathProgramCache]: Analyzing trace with hash -300551381, now seen corresponding path program 5 times [2022-11-16 19:44:02,797 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 19:44:02,797 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1801953624] [2022-11-16 19:44:02,797 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 19:44:02,797 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 19:44:02,833 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 19:44:04,722 INFO L134 CoverageAnalysis]: Checked inductivity of 496 backedges. 0 proven. 496 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 19:44:04,722 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 19:44:04,722 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1801953624] [2022-11-16 19:44:04,723 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1801953624] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-16 19:44:04,723 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1016817958] [2022-11-16 19:44:04,723 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-16 19:44:04,723 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 19:44:04,723 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_361757dd-0935-42ba-8646-d7071cd1efc7/bin/utaipan-Xvt2sAort0/z3 [2022-11-16 19:44:04,724 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_361757dd-0935-42ba-8646-d7071cd1efc7/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-16 19:44:04,749 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_361757dd-0935-42ba-8646-d7071cd1efc7/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2022-11-16 19:44:04,931 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 17 check-sat command(s) [2022-11-16 19:44:04,931 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-16 19:44:04,936 INFO L263 TraceCheckSpWp]: Trace formula consists of 368 conjuncts, 140 conjunts are in the unsatisfiable core [2022-11-16 19:44:04,941 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-16 19:44:04,949 INFO L350 Elim1Store]: Elim1 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 6 treesize of output 5 [2022-11-16 19:44:04,992 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 14 treesize of output 10