./Ultimate.py --spec ../../sv-benchmarks/c/properties/valid-memsafety.prp --file ../../sv-benchmarks/c/list-ext3-properties/sll_length_check-2.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for memory safety (deref-memtrack) Using default analysis Version 2329fc70 Calling Ultimate with: /usr/lib/jvm/java-11-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_796726a8-e317-4db0-8bbd-479427385a6d/bin/utaipan-gh47qXpMRh/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_796726a8-e317-4db0-8bbd-479427385a6d/bin/utaipan-gh47qXpMRh/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_796726a8-e317-4db0-8bbd-479427385a6d/bin/utaipan-gh47qXpMRh/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_796726a8-e317-4db0-8bbd-479427385a6d/bin/utaipan-gh47qXpMRh/config/TaipanMemDerefMemtrack.xml -i ../../sv-benchmarks/c/list-ext3-properties/sll_length_check-2.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_796726a8-e317-4db0-8bbd-479427385a6d/bin/utaipan-gh47qXpMRh/config/svcomp-DerefFreeMemtrack-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_796726a8-e317-4db0-8bbd-479427385a6d/bin/utaipan-gh47qXpMRh --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 0b1cf2dd5b4da09460afcca66f285dbd0591f4fa3369eb070fcfcc2c1d99d315 --- 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-2329fc7 [2022-12-14 07:18:48,082 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-12-14 07:18:48,084 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-12-14 07:18:48,103 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-12-14 07:18:48,104 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-12-14 07:18:48,105 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-12-14 07:18:48,106 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-12-14 07:18:48,107 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-12-14 07:18:48,109 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-12-14 07:18:48,110 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-12-14 07:18:48,110 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-12-14 07:18:48,111 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-12-14 07:18:48,112 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-12-14 07:18:48,113 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-12-14 07:18:48,114 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-12-14 07:18:48,115 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-12-14 07:18:48,116 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-12-14 07:18:48,116 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-12-14 07:18:48,118 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-12-14 07:18:48,120 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-12-14 07:18:48,121 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-12-14 07:18:48,122 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-12-14 07:18:48,123 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-12-14 07:18:48,124 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-12-14 07:18:48,132 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-12-14 07:18:48,133 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-12-14 07:18:48,133 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-12-14 07:18:48,133 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-12-14 07:18:48,134 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-12-14 07:18:48,134 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-12-14 07:18:48,135 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-12-14 07:18:48,135 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-12-14 07:18:48,136 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-12-14 07:18:48,136 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-12-14 07:18:48,137 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-12-14 07:18:48,137 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-12-14 07:18:48,137 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-12-14 07:18:48,138 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-12-14 07:18:48,138 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-12-14 07:18:48,138 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-12-14 07:18:48,139 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-12-14 07:18:48,139 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_796726a8-e317-4db0-8bbd-479427385a6d/bin/utaipan-gh47qXpMRh/config/svcomp-DerefFreeMemtrack-32bit-Taipan_Default.epf [2022-12-14 07:18:48,154 INFO L113 SettingsManager]: Loading preferences was successful [2022-12-14 07:18:48,154 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-12-14 07:18:48,155 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2022-12-14 07:18:48,155 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2022-12-14 07:18:48,155 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-12-14 07:18:48,155 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-12-14 07:18:48,160 INFO L138 SettingsManager]: * User list type=DISABLED [2022-12-14 07:18:48,160 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2022-12-14 07:18:48,160 INFO L138 SettingsManager]: * Explicit value domain=true [2022-12-14 07:18:48,160 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2022-12-14 07:18:48,160 INFO L138 SettingsManager]: * Octagon Domain=false [2022-12-14 07:18:48,161 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2022-12-14 07:18:48,161 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2022-12-14 07:18:48,161 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2022-12-14 07:18:48,161 INFO L138 SettingsManager]: * Interval Domain=false [2022-12-14 07:18:48,161 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2022-12-14 07:18:48,161 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2022-12-14 07:18:48,161 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2022-12-14 07:18:48,162 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2022-12-14 07:18:48,162 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2022-12-14 07:18:48,162 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-12-14 07:18:48,163 INFO L138 SettingsManager]: * sizeof long=4 [2022-12-14 07:18:48,163 INFO L138 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2022-12-14 07:18:48,163 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-12-14 07:18:48,163 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-12-14 07:18:48,163 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-12-14 07:18:48,163 INFO L138 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2022-12-14 07:18:48,163 INFO L138 SettingsManager]: * Bitprecise bitfields=true [2022-12-14 07:18:48,164 INFO L138 SettingsManager]: * SV-COMP memtrack compatibility mode=true [2022-12-14 07:18:48,164 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-12-14 07:18:48,164 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2022-12-14 07:18:48,164 INFO L138 SettingsManager]: * sizeof long double=12 [2022-12-14 07:18:48,164 INFO L138 SettingsManager]: * Use constant arrays=true [2022-12-14 07:18:48,164 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-12-14 07:18:48,165 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-12-14 07:18:48,165 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-12-14 07:18:48,165 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-12-14 07:18:48,165 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2022-12-14 07:18:48,165 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-12-14 07:18:48,165 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2022-12-14 07:18:48,165 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2022-12-14 07:18:48,166 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2022-12-14 07:18:48,166 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_796726a8-e317-4db0-8bbd-479427385a6d/bin/utaipan-gh47qXpMRh/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_796726a8-e317-4db0-8bbd-479427385a6d/bin/utaipan-gh47qXpMRh Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 0b1cf2dd5b4da09460afcca66f285dbd0591f4fa3369eb070fcfcc2c1d99d315 [2022-12-14 07:18:48,326 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-12-14 07:18:48,342 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-12-14 07:18:48,344 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-12-14 07:18:48,344 INFO L271 PluginConnector]: Initializing CDTParser... [2022-12-14 07:18:48,345 INFO L275 PluginConnector]: CDTParser initialized [2022-12-14 07:18:48,346 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_796726a8-e317-4db0-8bbd-479427385a6d/bin/utaipan-gh47qXpMRh/../../sv-benchmarks/c/list-ext3-properties/sll_length_check-2.i [2022-12-14 07:18:50,925 INFO L500 CDTParser]: Created temporary CDT project at NULL [2022-12-14 07:18:51,147 INFO L351 CDTParser]: Found 1 translation units. [2022-12-14 07:18:51,147 INFO L172 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_796726a8-e317-4db0-8bbd-479427385a6d/sv-benchmarks/c/list-ext3-properties/sll_length_check-2.i [2022-12-14 07:18:51,157 INFO L394 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_796726a8-e317-4db0-8bbd-479427385a6d/bin/utaipan-gh47qXpMRh/data/c367b9922/dda76c59bb9e4a1394c8e3c3d24647ad/FLAG7ee8db003 [2022-12-14 07:18:51,534 INFO L402 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_796726a8-e317-4db0-8bbd-479427385a6d/bin/utaipan-gh47qXpMRh/data/c367b9922/dda76c59bb9e4a1394c8e3c3d24647ad [2022-12-14 07:18:51,540 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-12-14 07:18:51,544 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2022-12-14 07:18:51,547 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-12-14 07:18:51,547 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-12-14 07:18:51,556 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-12-14 07:18:51,558 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 14.12 07:18:51" (1/1) ... [2022-12-14 07:18:51,559 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@4f68af0 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 07:18:51, skipping insertion in model container [2022-12-14 07:18:51,560 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 14.12 07:18:51" (1/1) ... [2022-12-14 07:18:51,569 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-12-14 07:18:51,596 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-12-14 07:18:51,774 WARN L237 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_796726a8-e317-4db0-8bbd-479427385a6d/sv-benchmarks/c/list-ext3-properties/sll_length_check-2.i[23814,23827] [2022-12-14 07:18:51,776 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-12-14 07:18:51,783 INFO L203 MainTranslator]: Completed pre-run [2022-12-14 07:18:51,806 WARN L237 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_796726a8-e317-4db0-8bbd-479427385a6d/sv-benchmarks/c/list-ext3-properties/sll_length_check-2.i[23814,23827] [2022-12-14 07:18:51,807 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-12-14 07:18:51,823 INFO L208 MainTranslator]: Completed translation [2022-12-14 07:18:51,823 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 07:18:51 WrapperNode [2022-12-14 07:18:51,823 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-12-14 07:18:51,824 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2022-12-14 07:18:51,824 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2022-12-14 07:18:51,824 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2022-12-14 07:18:51,830 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 07:18:51" (1/1) ... [2022-12-14 07:18:51,838 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 07:18:51" (1/1) ... [2022-12-14 07:18:51,852 INFO L138 Inliner]: procedures = 125, calls = 15, calls flagged for inlining = 6, calls inlined = 6, statements flattened = 90 [2022-12-14 07:18:51,852 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2022-12-14 07:18:51,853 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-12-14 07:18:51,853 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-12-14 07:18:51,853 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-12-14 07:18:51,859 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 07:18:51" (1/1) ... [2022-12-14 07:18:51,859 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 07:18:51" (1/1) ... [2022-12-14 07:18:51,861 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 07:18:51" (1/1) ... [2022-12-14 07:18:51,862 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 07:18:51" (1/1) ... [2022-12-14 07:18:51,866 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 07:18:51" (1/1) ... [2022-12-14 07:18:51,868 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 07:18:51" (1/1) ... [2022-12-14 07:18:51,869 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 07:18:51" (1/1) ... [2022-12-14 07:18:51,870 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 07:18:51" (1/1) ... [2022-12-14 07:18:51,871 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-12-14 07:18:51,872 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-12-14 07:18:51,872 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-12-14 07:18:51,872 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-12-14 07:18:51,873 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 07:18:51" (1/1) ... [2022-12-14 07:18:51,878 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-12-14 07:18:51,887 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_796726a8-e317-4db0-8bbd-479427385a6d/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 07:18:51,898 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_796726a8-e317-4db0-8bbd-479427385a6d/bin/utaipan-gh47qXpMRh/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-12-14 07:18:51,900 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_796726a8-e317-4db0-8bbd-479427385a6d/bin/utaipan-gh47qXpMRh/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-12-14 07:18:51,930 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2022-12-14 07:18:51,930 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-12-14 07:18:51,930 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2022-12-14 07:18:51,930 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2022-12-14 07:18:51,930 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2022-12-14 07:18:51,930 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-12-14 07:18:51,931 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-12-14 07:18:51,931 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-12-14 07:18:52,009 INFO L235 CfgBuilder]: Building ICFG [2022-12-14 07:18:52,011 INFO L261 CfgBuilder]: Building CFG for each procedure with an implementation [2022-12-14 07:18:52,133 INFO L276 CfgBuilder]: Performing block encoding [2022-12-14 07:18:52,168 INFO L295 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-12-14 07:18:52,168 INFO L300 CfgBuilder]: Removed 4 assume(true) statements. [2022-12-14 07:18:52,170 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 14.12 07:18:52 BoogieIcfgContainer [2022-12-14 07:18:52,170 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-12-14 07:18:52,171 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-12-14 07:18:52,172 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-12-14 07:18:52,174 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-12-14 07:18:52,174 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 14.12 07:18:51" (1/3) ... [2022-12-14 07:18:52,175 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4c61bb37 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 14.12 07:18:52, skipping insertion in model container [2022-12-14 07:18:52,175 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 07:18:51" (2/3) ... [2022-12-14 07:18:52,175 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4c61bb37 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 14.12 07:18:52, skipping insertion in model container [2022-12-14 07:18:52,175 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 14.12 07:18:52" (3/3) ... [2022-12-14 07:18:52,176 INFO L112 eAbstractionObserver]: Analyzing ICFG sll_length_check-2.i [2022-12-14 07:18:52,190 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2022-12-14 07:18:52,190 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 11 error locations. [2022-12-14 07:18:52,221 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-12-14 07:18:52,225 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;@59dd2da9, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2022-12-14 07:18:52,225 INFO L358 AbstractCegarLoop]: Starting to check reachability of 11 error locations. [2022-12-14 07:18:52,228 INFO L276 IsEmpty]: Start isEmpty. Operand has 30 states, 18 states have (on average 2.0) internal successors, (36), 29 states have internal predecessors, (36), 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) [2022-12-14 07:18:52,233 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2022-12-14 07:18:52,233 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 07:18:52,233 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2022-12-14 07:18:52,234 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 8 more)] === [2022-12-14 07:18:52,237 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 07:18:52,238 INFO L85 PathProgramCache]: Analyzing trace with hash -324909178, now seen corresponding path program 1 times [2022-12-14 07:18:52,245 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 07:18:52,245 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [396854860] [2022-12-14 07:18:52,245 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 07:18:52,245 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 07:18:52,321 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 07:18:52,369 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 07:18:52,369 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 07:18:52,369 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [396854860] [2022-12-14 07:18:52,370 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [396854860] provided 1 perfect and 0 imperfect interpolant sequences [2022-12-14 07:18:52,370 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-12-14 07:18:52,370 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2022-12-14 07:18:52,371 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [910892721] [2022-12-14 07:18:52,372 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-12-14 07:18:52,375 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2022-12-14 07:18:52,375 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 07:18:52,397 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2022-12-14 07:18:52,398 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2022-12-14 07:18:52,399 INFO L87 Difference]: Start difference. First operand has 30 states, 18 states have (on average 2.0) internal successors, (36), 29 states have internal predecessors, (36), 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 2 states, 2 states have (on average 3.0) internal successors, (6), 2 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) [2022-12-14 07:18:52,425 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 07:18:52,425 INFO L93 Difference]: Finished difference Result 30 states and 34 transitions. [2022-12-14 07:18:52,426 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2022-12-14 07:18:52,427 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 2 states have (on average 3.0) internal successors, (6), 2 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 [2022-12-14 07:18:52,427 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 07:18:52,433 INFO L225 Difference]: With dead ends: 30 [2022-12-14 07:18:52,433 INFO L226 Difference]: Without dead ends: 28 [2022-12-14 07:18:52,434 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2022-12-14 07:18:52,437 INFO L413 NwaCegarLoop]: 25 mSDtfsCounter, 0 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 9 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 25 SdHoareTripleChecker+Invalid, 9 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 9 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-12-14 07:18:52,437 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 25 Invalid, 9 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 9 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-12-14 07:18:52,450 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2022-12-14 07:18:52,457 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2022-12-14 07:18:52,458 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28 states, 17 states have (on average 1.8235294117647058) internal successors, (31), 27 states have internal predecessors, (31), 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) [2022-12-14 07:18:52,459 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 31 transitions. [2022-12-14 07:18:52,459 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 31 transitions. Word has length 6 [2022-12-14 07:18:52,459 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 07:18:52,460 INFO L495 AbstractCegarLoop]: Abstraction has 28 states and 31 transitions. [2022-12-14 07:18:52,460 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 3.0) internal successors, (6), 2 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) [2022-12-14 07:18:52,460 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 31 transitions. [2022-12-14 07:18:52,460 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2022-12-14 07:18:52,460 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 07:18:52,460 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2022-12-14 07:18:52,461 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-12-14 07:18:52,461 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 8 more)] === [2022-12-14 07:18:52,461 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 07:18:52,461 INFO L85 PathProgramCache]: Analyzing trace with hash 1315237408, now seen corresponding path program 1 times [2022-12-14 07:18:52,461 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 07:18:52,462 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1454129887] [2022-12-14 07:18:52,462 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 07:18:52,462 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 07:18:52,476 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 07:18:52,543 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 07:18:52,544 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 07:18:52,544 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1454129887] [2022-12-14 07:18:52,544 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1454129887] provided 1 perfect and 0 imperfect interpolant sequences [2022-12-14 07:18:52,544 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-12-14 07:18:52,544 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-12-14 07:18:52,544 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1404284672] [2022-12-14 07:18:52,544 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-12-14 07:18:52,545 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-12-14 07:18:52,545 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 07:18:52,546 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-12-14 07:18:52,546 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-12-14 07:18:52,546 INFO L87 Difference]: Start difference. First operand 28 states and 31 transitions. Second operand has 4 states, 4 states have (on average 1.75) internal successors, (7), 3 states have internal predecessors, (7), 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) [2022-12-14 07:18:52,587 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 07:18:52,588 INFO L93 Difference]: Finished difference Result 33 states and 36 transitions. [2022-12-14 07:18:52,588 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-12-14 07:18:52,588 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 1.75) internal successors, (7), 3 states have internal predecessors, (7), 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 [2022-12-14 07:18:52,588 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 07:18:52,589 INFO L225 Difference]: With dead ends: 33 [2022-12-14 07:18:52,589 INFO L226 Difference]: Without dead ends: 33 [2022-12-14 07:18:52,590 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2022-12-14 07:18:52,591 INFO L413 NwaCegarLoop]: 18 mSDtfsCounter, 36 mSDsluCounter, 18 mSDsCounter, 0 mSdLazyCounter, 25 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 36 SdHoareTripleChecker+Valid, 36 SdHoareTripleChecker+Invalid, 26 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 25 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-12-14 07:18:52,592 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [36 Valid, 36 Invalid, 26 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 25 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-12-14 07:18:52,592 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2022-12-14 07:18:52,594 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 29. [2022-12-14 07:18:52,594 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 29 states, 18 states have (on average 1.7777777777777777) internal successors, (32), 28 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) [2022-12-14 07:18:52,595 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 32 transitions. [2022-12-14 07:18:52,595 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 32 transitions. Word has length 7 [2022-12-14 07:18:52,595 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 07:18:52,595 INFO L495 AbstractCegarLoop]: Abstraction has 29 states and 32 transitions. [2022-12-14 07:18:52,595 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 1.75) internal successors, (7), 3 states have internal predecessors, (7), 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) [2022-12-14 07:18:52,596 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 32 transitions. [2022-12-14 07:18:52,596 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2022-12-14 07:18:52,596 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 07:18:52,596 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2022-12-14 07:18:52,596 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2022-12-14 07:18:52,596 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 8 more)] === [2022-12-14 07:18:52,597 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 07:18:52,597 INFO L85 PathProgramCache]: Analyzing trace with hash 1315158928, now seen corresponding path program 1 times [2022-12-14 07:18:52,597 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 07:18:52,597 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1567741258] [2022-12-14 07:18:52,597 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 07:18:52,597 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 07:18:52,607 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 07:18:52,646 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 07:18:52,646 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 07:18:52,646 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1567741258] [2022-12-14 07:18:52,647 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1567741258] provided 1 perfect and 0 imperfect interpolant sequences [2022-12-14 07:18:52,647 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-12-14 07:18:52,647 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2022-12-14 07:18:52,647 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [635780442] [2022-12-14 07:18:52,647 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-12-14 07:18:52,648 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-12-14 07:18:52,648 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 07:18:52,648 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-12-14 07:18:52,649 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-12-14 07:18:52,649 INFO L87 Difference]: Start difference. First operand 29 states and 32 transitions. Second operand has 3 states, 2 states have (on average 3.5) internal successors, (7), 3 states have internal predecessors, (7), 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) [2022-12-14 07:18:52,682 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 07:18:52,682 INFO L93 Difference]: Finished difference Result 40 states and 43 transitions. [2022-12-14 07:18:52,683 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-12-14 07:18:52,683 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 3.5) internal successors, (7), 3 states have internal predecessors, (7), 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 [2022-12-14 07:18:52,683 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 07:18:52,684 INFO L225 Difference]: With dead ends: 40 [2022-12-14 07:18:52,684 INFO L226 Difference]: Without dead ends: 40 [2022-12-14 07:18:52,684 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 [2022-12-14 07:18:52,686 INFO L413 NwaCegarLoop]: 15 mSDtfsCounter, 22 mSDsluCounter, 8 mSDsCounter, 0 mSdLazyCounter, 25 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 22 SdHoareTripleChecker+Valid, 23 SdHoareTripleChecker+Invalid, 25 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 25 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-12-14 07:18:52,686 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [22 Valid, 23 Invalid, 25 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 25 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-12-14 07:18:52,687 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2022-12-14 07:18:52,689 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 28. [2022-12-14 07:18:52,690 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28 states, 18 states have (on average 1.7222222222222223) internal successors, (31), 27 states have internal predecessors, (31), 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) [2022-12-14 07:18:52,690 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 31 transitions. [2022-12-14 07:18:52,690 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 31 transitions. Word has length 7 [2022-12-14 07:18:52,691 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 07:18:52,691 INFO L495 AbstractCegarLoop]: Abstraction has 28 states and 31 transitions. [2022-12-14 07:18:52,691 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 3.5) internal successors, (7), 3 states have internal predecessors, (7), 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) [2022-12-14 07:18:52,691 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 31 transitions. [2022-12-14 07:18:52,691 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2022-12-14 07:18:52,692 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 07:18:52,692 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2022-12-14 07:18:52,692 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2022-12-14 07:18:52,692 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 8 more)] === [2022-12-14 07:18:52,693 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 07:18:52,693 INFO L85 PathProgramCache]: Analyzing trace with hash 1315158929, now seen corresponding path program 1 times [2022-12-14 07:18:52,693 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 07:18:52,693 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [999878328] [2022-12-14 07:18:52,693 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 07:18:52,694 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 07:18:52,709 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 07:18:52,765 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 07:18:52,765 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 07:18:52,765 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [999878328] [2022-12-14 07:18:52,765 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [999878328] provided 1 perfect and 0 imperfect interpolant sequences [2022-12-14 07:18:52,765 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-12-14 07:18:52,765 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2022-12-14 07:18:52,765 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [266714889] [2022-12-14 07:18:52,766 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-12-14 07:18:52,766 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-12-14 07:18:52,766 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 07:18:52,766 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-12-14 07:18:52,766 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-12-14 07:18:52,766 INFO L87 Difference]: Start difference. First operand 28 states and 31 transitions. Second operand has 3 states, 2 states have (on average 3.5) internal successors, (7), 3 states have internal predecessors, (7), 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) [2022-12-14 07:18:52,787 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 07:18:52,787 INFO L93 Difference]: Finished difference Result 27 states and 30 transitions. [2022-12-14 07:18:52,788 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-12-14 07:18:52,788 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 3.5) internal successors, (7), 3 states have internal predecessors, (7), 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 [2022-12-14 07:18:52,788 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 07:18:52,788 INFO L225 Difference]: With dead ends: 27 [2022-12-14 07:18:52,789 INFO L226 Difference]: Without dead ends: 27 [2022-12-14 07:18:52,789 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 [2022-12-14 07:18:52,790 INFO L413 NwaCegarLoop]: 18 mSDtfsCounter, 22 mSDsluCounter, 2 mSDsCounter, 0 mSdLazyCounter, 15 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 22 SdHoareTripleChecker+Valid, 20 SdHoareTripleChecker+Invalid, 15 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 15 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-12-14 07:18:52,790 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [22 Valid, 20 Invalid, 15 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 15 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-12-14 07:18:52,791 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2022-12-14 07:18:52,792 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2022-12-14 07:18:52,792 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27 states, 18 states have (on average 1.6666666666666667) internal successors, (30), 26 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) [2022-12-14 07:18:52,792 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 30 transitions. [2022-12-14 07:18:52,792 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 30 transitions. Word has length 7 [2022-12-14 07:18:52,792 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 07:18:52,792 INFO L495 AbstractCegarLoop]: Abstraction has 27 states and 30 transitions. [2022-12-14 07:18:52,793 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 3.5) internal successors, (7), 3 states have internal predecessors, (7), 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) [2022-12-14 07:18:52,793 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 30 transitions. [2022-12-14 07:18:52,793 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2022-12-14 07:18:52,793 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 07:18:52,793 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 07:18:52,793 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2022-12-14 07:18:52,793 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 8 more)] === [2022-12-14 07:18:52,794 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 07:18:52,794 INFO L85 PathProgramCache]: Analyzing trace with hash 1210025600, now seen corresponding path program 1 times [2022-12-14 07:18:52,794 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 07:18:52,794 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [854272229] [2022-12-14 07:18:52,794 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 07:18:52,794 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 07:18:52,809 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 07:18:52,886 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 07:18:52,886 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 07:18:52,887 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [854272229] [2022-12-14 07:18:52,887 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [854272229] provided 1 perfect and 0 imperfect interpolant sequences [2022-12-14 07:18:52,887 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-12-14 07:18:52,887 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-12-14 07:18:52,887 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [631861198] [2022-12-14 07:18:52,887 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-12-14 07:18:52,888 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-12-14 07:18:52,888 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 07:18:52,888 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-12-14 07:18:52,888 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-12-14 07:18:52,889 INFO L87 Difference]: Start difference. First operand 27 states and 30 transitions. Second operand has 4 states, 3 states have (on average 3.3333333333333335) internal successors, (10), 4 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) [2022-12-14 07:18:52,944 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 07:18:52,944 INFO L93 Difference]: Finished difference Result 59 states and 63 transitions. [2022-12-14 07:18:52,945 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-12-14 07:18:52,945 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 3.3333333333333335) internal successors, (10), 4 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 [2022-12-14 07:18:52,945 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 07:18:52,946 INFO L225 Difference]: With dead ends: 59 [2022-12-14 07:18:52,946 INFO L226 Difference]: Without dead ends: 59 [2022-12-14 07:18:52,946 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2022-12-14 07:18:52,947 INFO L413 NwaCegarLoop]: 15 mSDtfsCounter, 55 mSDsluCounter, 23 mSDsCounter, 0 mSdLazyCounter, 44 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 55 SdHoareTripleChecker+Valid, 38 SdHoareTripleChecker+Invalid, 45 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 44 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-12-14 07:18:52,947 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [55 Valid, 38 Invalid, 45 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 44 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-12-14 07:18:52,947 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2022-12-14 07:18:52,949 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 29. [2022-12-14 07:18:52,949 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 29 states, 20 states have (on average 1.7) internal successors, (34), 28 states have internal predecessors, (34), 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) [2022-12-14 07:18:52,949 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 34 transitions. [2022-12-14 07:18:52,949 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 34 transitions. Word has length 10 [2022-12-14 07:18:52,949 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 07:18:52,950 INFO L495 AbstractCegarLoop]: Abstraction has 29 states and 34 transitions. [2022-12-14 07:18:52,950 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 3.3333333333333335) internal successors, (10), 4 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) [2022-12-14 07:18:52,950 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 34 transitions. [2022-12-14 07:18:52,950 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2022-12-14 07:18:52,950 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 07:18:52,950 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 07:18:52,950 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2022-12-14 07:18:52,950 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 8 more)] === [2022-12-14 07:18:52,951 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 07:18:52,951 INFO L85 PathProgramCache]: Analyzing trace with hash 1210025601, now seen corresponding path program 1 times [2022-12-14 07:18:52,951 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 07:18:52,951 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [130388212] [2022-12-14 07:18:52,951 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 07:18:52,951 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 07:18:52,963 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 07:18:53,020 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 07:18:53,020 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 07:18:53,020 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [130388212] [2022-12-14 07:18:53,020 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [130388212] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 07:18:53,021 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [345343026] [2022-12-14 07:18:53,021 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 07:18:53,021 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 07:18:53,021 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_796726a8-e317-4db0-8bbd-479427385a6d/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 07:18:53,022 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_796726a8-e317-4db0-8bbd-479427385a6d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 07:18:53,026 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_796726a8-e317-4db0-8bbd-479427385a6d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-12-14 07:18:53,079 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 07:18:53,081 INFO L263 TraceCheckSpWp]: Trace formula consists of 94 conjuncts, 5 conjunts are in the unsatisfiable core [2022-12-14 07:18:53,085 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 07:18:53,122 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 07:18:53,123 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 07:18:53,147 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 07:18:53,148 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [345343026] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 07:18:53,148 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [233948009] [2022-12-14 07:18:53,163 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-12-14 07:18:53,163 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 07:18:53,166 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 07:18:53,170 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 07:18:53,170 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 07:18:53,260 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:18:53,261 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:18:53,267 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 22 [2022-12-14 07:18:53,293 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 11 treesize of output 7 [2022-12-14 07:18:53,303 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 11 treesize of output 7 [2022-12-14 07:18:53,313 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:18:53,314 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:18:53,316 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 30 treesize of output 21 [2022-12-14 07:18:53,341 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:18:53,343 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:18:53,344 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:18:53,345 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:18:53,346 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:18:53,347 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 8 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 29 treesize of output 35 [2022-12-14 07:18:53,422 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 07:18:53,435 INFO L321 Elim1Store]: treesize reduction 21, result has 25.0 percent of original size [2022-12-14 07:18:53,436 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 245 treesize of output 228 [2022-12-14 07:18:53,450 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 07:18:53,462 INFO L321 Elim1Store]: treesize reduction 17, result has 29.2 percent of original size [2022-12-14 07:18:53,462 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 241 treesize of output 240 [2022-12-14 07:18:53,477 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 07:18:53,489 INFO L321 Elim1Store]: treesize reduction 21, result has 34.4 percent of original size [2022-12-14 07:18:53,489 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 257 treesize of output 256 [2022-12-14 07:18:53,556 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:18:53,591 INFO L321 Elim1Store]: treesize reduction 106, result has 15.9 percent of original size [2022-12-14 07:18:53,592 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 3 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 8 case distinctions, treesize of input 285 treesize of output 288 [2022-12-14 07:18:53,684 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 07:18:53,695 INFO L321 Elim1Store]: treesize reduction 17, result has 29.2 percent of original size [2022-12-14 07:18:53,695 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 241 treesize of output 240 [2022-12-14 07:18:53,705 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 07:18:53,715 INFO L321 Elim1Store]: treesize reduction 29, result has 27.5 percent of original size [2022-12-14 07:18:53,715 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 277 treesize of output 276 [2022-12-14 07:18:53,725 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 07:18:53,734 INFO L321 Elim1Store]: treesize reduction 21, result has 25.0 percent of original size [2022-12-14 07:18:53,734 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 297 treesize of output 280 [2022-12-14 07:18:53,817 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:18:53,863 INFO L321 Elim1Store]: treesize reduction 106, result has 15.9 percent of original size [2022-12-14 07:18:53,863 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 3 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 8 case distinctions, treesize of input 285 treesize of output 288 [2022-12-14 07:18:53,901 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 07:18:54,619 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '442#(and (= |ULTIMATE.start_sll_length_#in~head#1.base| |ULTIMATE.start_sll_length_~head#1.base|) (= |ULTIMATE.start_main_~s~0#1.base| |ULTIMATE.start_sll_create_#res#1.base|) (= |ULTIMATE.start_main_~s~0#1.offset| |ULTIMATE.start_sll_length_#in~head#1.offset|) (= |ULTIMATE.start_sll_create_~head~0#1.base| |ULTIMATE.start_sll_create_#res#1.base|) (= |ULTIMATE.start_sll_length_~len~0#1| 1) (<= |ULTIMATE.start_sll_create_~head~0#1.offset| 0) (<= |ULTIMATE.start_sll_create_~len#1| 0) (<= |#NULL.offset| 0) (<= |ULTIMATE.start_sll_create_#in~len#1| 2) (<= 0 |ULTIMATE.start_sll_create_~len#1|) (= |ULTIMATE.start_sll_create_#res#1.offset| |ULTIMATE.start_sll_create_~head~0#1.offset|) (not (= |ULTIMATE.start_sll_length_~head#1.base| 0)) (= |ULTIMATE.start_sll_create_#res#1.offset| |ULTIMATE.start_main_~s~0#1.offset|) (not (<= (+ |ULTIMATE.start_sll_length_~head#1.offset| 4) (select |#length| |ULTIMATE.start_sll_length_~head#1.base|))) (= |ULTIMATE.start_main_~len~1#1| 2) (<= 0 |#NULL.offset|) (= |ULTIMATE.start_sll_length_~head#1.offset| |ULTIMATE.start_sll_length_#in~head#1.offset|) (<= 0 |#StackHeapBarrier|) (<= 2 |ULTIMATE.start_sll_create_#in~len#1|) (<= 0 |ULTIMATE.start_sll_create_~head~0#1.offset|) (= |ULTIMATE.start_sll_length_#in~head#1.base| |ULTIMATE.start_main_~s~0#1.base|) (= |#NULL.base| 0))' at error location [2022-12-14 07:18:54,619 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 07:18:54,619 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 07:18:54,619 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 4 [2022-12-14 07:18:54,620 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [919439507] [2022-12-14 07:18:54,620 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 07:18:54,620 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-12-14 07:18:54,620 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 07:18:54,621 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-12-14 07:18:54,621 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=115, Unknown=0, NotChecked=0, Total=156 [2022-12-14 07:18:54,621 INFO L87 Difference]: Start difference. First operand 29 states and 34 transitions. Second operand has 5 states, 5 states have (on average 2.0) internal successors, (10), 4 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) [2022-12-14 07:18:54,657 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 07:18:54,657 INFO L93 Difference]: Finished difference Result 32 states and 37 transitions. [2022-12-14 07:18:54,658 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-12-14 07:18:54,658 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.0) internal successors, (10), 4 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 [2022-12-14 07:18:54,658 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 07:18:54,658 INFO L225 Difference]: With dead ends: 32 [2022-12-14 07:18:54,658 INFO L226 Difference]: Without dead ends: 32 [2022-12-14 07:18:54,659 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 18 SyntacticMatches, 3 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=52, Invalid=158, Unknown=0, NotChecked=0, Total=210 [2022-12-14 07:18:54,660 INFO L413 NwaCegarLoop]: 16 mSDtfsCounter, 31 mSDsluCounter, 16 mSDsCounter, 0 mSdLazyCounter, 26 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 31 SdHoareTripleChecker+Valid, 32 SdHoareTripleChecker+Invalid, 28 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 26 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-12-14 07:18:54,660 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [31 Valid, 32 Invalid, 28 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 26 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-12-14 07:18:54,661 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2022-12-14 07:18:54,662 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32. [2022-12-14 07:18:54,662 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 32 states, 23 states have (on average 1.608695652173913) internal successors, (37), 31 states have internal predecessors, (37), 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) [2022-12-14 07:18:54,662 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 37 transitions. [2022-12-14 07:18:54,663 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 37 transitions. Word has length 10 [2022-12-14 07:18:54,663 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 07:18:54,663 INFO L495 AbstractCegarLoop]: Abstraction has 32 states and 37 transitions. [2022-12-14 07:18:54,663 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 2.0) internal successors, (10), 4 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) [2022-12-14 07:18:54,663 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 37 transitions. [2022-12-14 07:18:54,663 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2022-12-14 07:18:54,663 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 07:18:54,663 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 07:18:54,668 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_796726a8-e317-4db0-8bbd-479427385a6d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2022-12-14 07:18:54,864 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_796726a8-e317-4db0-8bbd-479427385a6d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2022-12-14 07:18:54,865 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 8 more)] === [2022-12-14 07:18:54,866 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 07:18:54,866 INFO L85 PathProgramCache]: Analyzing trace with hash -2123787743, now seen corresponding path program 2 times [2022-12-14 07:18:54,866 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 07:18:54,866 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [495128588] [2022-12-14 07:18:54,866 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 07:18:54,867 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 07:18:54,884 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 07:18:55,010 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-12-14 07:18:55,010 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 07:18:55,010 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [495128588] [2022-12-14 07:18:55,011 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [495128588] provided 1 perfect and 0 imperfect interpolant sequences [2022-12-14 07:18:55,011 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-12-14 07:18:55,011 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-12-14 07:18:55,011 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [944311725] [2022-12-14 07:18:55,011 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-12-14 07:18:55,011 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-12-14 07:18:55,012 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 07:18:55,012 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-12-14 07:18:55,012 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-12-14 07:18:55,012 INFO L87 Difference]: Start difference. First operand 32 states and 37 transitions. Second operand has 5 states, 4 states have (on average 3.25) internal successors, (13), 5 states have internal predecessors, (13), 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) [2022-12-14 07:18:55,066 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 07:18:55,066 INFO L93 Difference]: Finished difference Result 47 states and 51 transitions. [2022-12-14 07:18:55,067 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-12-14 07:18:55,067 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 3.25) internal successors, (13), 5 states have internal predecessors, (13), 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 13 [2022-12-14 07:18:55,067 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 07:18:55,067 INFO L225 Difference]: With dead ends: 47 [2022-12-14 07:18:55,067 INFO L226 Difference]: Without dead ends: 47 [2022-12-14 07:18:55,068 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2022-12-14 07:18:55,068 INFO L413 NwaCegarLoop]: 17 mSDtfsCounter, 96 mSDsluCounter, 19 mSDsCounter, 0 mSdLazyCounter, 39 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 96 SdHoareTripleChecker+Valid, 36 SdHoareTripleChecker+Invalid, 40 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 39 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-12-14 07:18:55,069 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [96 Valid, 36 Invalid, 40 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 39 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-12-14 07:18:55,069 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2022-12-14 07:18:55,071 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 32. [2022-12-14 07:18:55,072 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 32 states, 23 states have (on average 1.565217391304348) internal successors, (36), 31 states have internal predecessors, (36), 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) [2022-12-14 07:18:55,072 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 36 transitions. [2022-12-14 07:18:55,072 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 36 transitions. Word has length 13 [2022-12-14 07:18:55,072 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 07:18:55,072 INFO L495 AbstractCegarLoop]: Abstraction has 32 states and 36 transitions. [2022-12-14 07:18:55,073 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 3.25) internal successors, (13), 5 states have internal predecessors, (13), 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) [2022-12-14 07:18:55,073 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 36 transitions. [2022-12-14 07:18:55,073 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2022-12-14 07:18:55,073 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 07:18:55,073 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 07:18:55,073 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2022-12-14 07:18:55,073 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr9ASSERT_VIOLATIONMEMORY_LEAK === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 8 more)] === [2022-12-14 07:18:55,074 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 07:18:55,074 INFO L85 PathProgramCache]: Analyzing trace with hash -1412855409, now seen corresponding path program 1 times [2022-12-14 07:18:55,074 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 07:18:55,074 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1669767078] [2022-12-14 07:18:55,074 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 07:18:55,074 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 07:18:55,085 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 07:18:55,136 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-12-14 07:18:55,137 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 07:18:55,137 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1669767078] [2022-12-14 07:18:55,137 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1669767078] provided 1 perfect and 0 imperfect interpolant sequences [2022-12-14 07:18:55,137 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-12-14 07:18:55,137 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-12-14 07:18:55,137 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1059617118] [2022-12-14 07:18:55,138 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-12-14 07:18:55,138 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-12-14 07:18:55,138 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 07:18:55,138 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-12-14 07:18:55,139 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-12-14 07:18:55,139 INFO L87 Difference]: Start difference. First operand 32 states and 36 transitions. Second operand has 5 states, 5 states have (on average 2.8) internal successors, (14), 5 states have internal predecessors, (14), 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) [2022-12-14 07:18:55,171 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 07:18:55,172 INFO L93 Difference]: Finished difference Result 32 states and 35 transitions. [2022-12-14 07:18:55,172 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-12-14 07:18:55,172 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.8) internal successors, (14), 5 states have internal predecessors, (14), 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 14 [2022-12-14 07:18:55,172 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 07:18:55,173 INFO L225 Difference]: With dead ends: 32 [2022-12-14 07:18:55,173 INFO L226 Difference]: Without dead ends: 32 [2022-12-14 07:18:55,173 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2022-12-14 07:18:55,174 INFO L413 NwaCegarLoop]: 20 mSDtfsCounter, 50 mSDsluCounter, 23 mSDsCounter, 0 mSdLazyCounter, 32 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 50 SdHoareTripleChecker+Valid, 43 SdHoareTripleChecker+Invalid, 32 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 32 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-12-14 07:18:55,174 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [50 Valid, 43 Invalid, 32 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 32 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-12-14 07:18:55,175 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2022-12-14 07:18:55,176 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32. [2022-12-14 07:18:55,176 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 32 states, 23 states have (on average 1.5217391304347827) internal successors, (35), 31 states have internal predecessors, (35), 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) [2022-12-14 07:18:55,177 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 35 transitions. [2022-12-14 07:18:55,177 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 35 transitions. Word has length 14 [2022-12-14 07:18:55,177 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 07:18:55,177 INFO L495 AbstractCegarLoop]: Abstraction has 32 states and 35 transitions. [2022-12-14 07:18:55,178 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 2.8) internal successors, (14), 5 states have internal predecessors, (14), 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) [2022-12-14 07:18:55,178 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 35 transitions. [2022-12-14 07:18:55,178 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2022-12-14 07:18:55,178 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 07:18:55,178 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 07:18:55,178 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2022-12-14 07:18:55,179 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 8 more)] === [2022-12-14 07:18:55,179 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 07:18:55,179 INFO L85 PathProgramCache]: Analyzing trace with hash -850507469, now seen corresponding path program 1 times [2022-12-14 07:18:55,179 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 07:18:55,179 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [310578614] [2022-12-14 07:18:55,179 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 07:18:55,180 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 07:18:55,193 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 07:18:55,346 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 2 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 07:18:55,346 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 07:18:55,346 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [310578614] [2022-12-14 07:18:55,346 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [310578614] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 07:18:55,347 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [422666799] [2022-12-14 07:18:55,347 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 07:18:55,347 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 07:18:55,347 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_796726a8-e317-4db0-8bbd-479427385a6d/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 07:18:55,348 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_796726a8-e317-4db0-8bbd-479427385a6d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 07:18:55,349 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_796726a8-e317-4db0-8bbd-479427385a6d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-12-14 07:18:55,401 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 07:18:55,403 INFO L263 TraceCheckSpWp]: Trace formula consists of 141 conjuncts, 31 conjunts are in the unsatisfiable core [2022-12-14 07:18:55,405 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 07:18:55,409 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 [2022-12-14 07:18:55,422 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 [2022-12-14 07:18:55,436 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-12-14 07:18:55,436 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 17 treesize of output 21 [2022-12-14 07:18:55,466 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 11 treesize of output 7 [2022-12-14 07:18:55,514 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 07:18:55,514 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 1 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 13 [2022-12-14 07:18:55,520 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2022-12-14 07:18:55,523 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 2 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 07:18:55,523 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 07:18:55,610 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 12 treesize of output 10 [2022-12-14 07:18:55,614 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 22 treesize of output 20 [2022-12-14 07:18:55,766 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 2 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 07:18:55,767 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [422666799] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 07:18:55,767 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [612031302] [2022-12-14 07:18:55,769 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-12-14 07:18:55,769 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 07:18:55,769 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 07:18:55,769 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 07:18:55,770 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 07:18:55,800 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:18:55,801 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:18:55,802 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 22 [2022-12-14 07:18:55,821 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 11 treesize of output 7 [2022-12-14 07:18:55,828 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:18:55,829 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:18:55,830 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 30 treesize of output 21 [2022-12-14 07:18:55,838 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 11 treesize of output 7 [2022-12-14 07:18:55,855 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:18:55,856 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:18:55,857 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:18:55,858 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:18:55,859 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:18:55,860 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 8 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 22 treesize of output 30 [2022-12-14 07:18:55,905 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 07:18:55,916 INFO L321 Elim1Store]: treesize reduction 17, result has 29.2 percent of original size [2022-12-14 07:18:55,917 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 241 treesize of output 240 [2022-12-14 07:18:55,927 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 07:18:55,938 INFO L321 Elim1Store]: treesize reduction 21, result has 25.0 percent of original size [2022-12-14 07:18:55,938 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 281 treesize of output 264 [2022-12-14 07:18:55,948 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 07:18:55,961 INFO L321 Elim1Store]: treesize reduction 29, result has 27.5 percent of original size [2022-12-14 07:18:55,962 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 277 treesize of output 276 [2022-12-14 07:18:56,022 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:18:56,046 INFO L321 Elim1Store]: treesize reduction 106, result has 15.9 percent of original size [2022-12-14 07:18:56,047 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 3 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 8 case distinctions, treesize of input 277 treesize of output 280 [2022-12-14 07:18:56,137 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 07:18:56,147 INFO L321 Elim1Store]: treesize reduction 17, result has 29.2 percent of original size [2022-12-14 07:18:56,148 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 241 treesize of output 240 [2022-12-14 07:18:56,156 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 07:18:56,166 INFO L321 Elim1Store]: treesize reduction 21, result has 25.0 percent of original size [2022-12-14 07:18:56,167 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 281 treesize of output 264 [2022-12-14 07:18:56,176 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 07:18:56,186 INFO L321 Elim1Store]: treesize reduction 29, result has 27.5 percent of original size [2022-12-14 07:18:56,186 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 277 treesize of output 276 [2022-12-14 07:18:56,336 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:18:56,366 INFO L321 Elim1Store]: treesize reduction 106, result has 15.9 percent of original size [2022-12-14 07:18:56,366 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 3 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 8 case distinctions, treesize of input 277 treesize of output 280 [2022-12-14 07:18:56,397 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 07:18:57,053 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '781#(and (<= 0 |ULTIMATE.start_main_~s~0#1.offset|) (<= 1 |ULTIMATE.start_sll_length_~len~0#1|) (not (= (select |#valid| |ULTIMATE.start_sll_length_~head#1.base|) 1)) (<= 0 |ULTIMATE.start_sll_length_#in~head#1.offset|) (<= |ULTIMATE.start_sll_length_#in~head#1.offset| 0) (<= |ULTIMATE.start_sll_create_~head~0#1.offset| 0) (<= |ULTIMATE.start_sll_create_~len#1| 0) (<= |ULTIMATE.start_sll_create_#res#1.offset| 0) (<= |ULTIMATE.start_sll_create_#in~len#1| 2) (<= 0 |ULTIMATE.start_sll_create_~len#1|) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_sll_create_#res#1.offset|) (= |ULTIMATE.start_main_~len~1#1| 2) (<= 0 |#StackHeapBarrier|) (<= 2 |ULTIMATE.start_sll_create_#in~len#1|) (<= |ULTIMATE.start_main_~s~0#1.offset| 0) (<= 0 |ULTIMATE.start_sll_create_~head~0#1.offset|) (= |#NULL.base| 0))' at error location [2022-12-14 07:18:57,053 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 07:18:57,053 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 07:18:57,053 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 15 [2022-12-14 07:18:57,053 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [458650538] [2022-12-14 07:18:57,053 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 07:18:57,054 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2022-12-14 07:18:57,054 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 07:18:57,054 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2022-12-14 07:18:57,054 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=66, Invalid=486, Unknown=0, NotChecked=0, Total=552 [2022-12-14 07:18:57,054 INFO L87 Difference]: Start difference. First operand 32 states and 35 transitions. Second operand has 16 states, 15 states have (on average 2.0) internal successors, (30), 16 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) [2022-12-14 07:18:59,419 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [1] [2022-12-14 07:18:59,477 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 07:18:59,477 INFO L93 Difference]: Finished difference Result 64 states and 68 transitions. [2022-12-14 07:18:59,477 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2022-12-14 07:18:59,478 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 15 states have (on average 2.0) internal successors, (30), 16 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) Word has length 15 [2022-12-14 07:18:59,478 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 07:18:59,478 INFO L225 Difference]: With dead ends: 64 [2022-12-14 07:18:59,478 INFO L226 Difference]: Without dead ends: 64 [2022-12-14 07:18:59,479 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 28 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 130 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=142, Invalid=728, Unknown=0, NotChecked=0, Total=870 [2022-12-14 07:18:59,479 INFO L413 NwaCegarLoop]: 12 mSDtfsCounter, 300 mSDsluCounter, 94 mSDsCounter, 0 mSdLazyCounter, 194 mSolverCounterSat, 4 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 300 SdHoareTripleChecker+Valid, 106 SdHoareTripleChecker+Invalid, 199 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 194 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.2s IncrementalHoareTripleChecker+Time [2022-12-14 07:18:59,480 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [300 Valid, 106 Invalid, 199 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 194 Invalid, 1 Unknown, 0 Unchecked, 2.2s Time] [2022-12-14 07:18:59,480 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2022-12-14 07:18:59,482 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 34. [2022-12-14 07:18:59,482 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 34 states, 25 states have (on average 1.56) internal successors, (39), 33 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) [2022-12-14 07:18:59,483 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 39 transitions. [2022-12-14 07:18:59,483 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 39 transitions. Word has length 15 [2022-12-14 07:18:59,483 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 07:18:59,483 INFO L495 AbstractCegarLoop]: Abstraction has 34 states and 39 transitions. [2022-12-14 07:18:59,483 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 15 states have (on average 2.0) internal successors, (30), 16 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) [2022-12-14 07:18:59,483 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 39 transitions. [2022-12-14 07:18:59,484 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2022-12-14 07:18:59,484 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 07:18:59,484 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 07:18:59,488 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_796726a8-e317-4db0-8bbd-479427385a6d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Ended with exit code 0 [2022-12-14 07:18:59,684 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_796726a8-e317-4db0-8bbd-479427385a6d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable8 [2022-12-14 07:18:59,686 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 8 more)] === [2022-12-14 07:18:59,687 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 07:18:59,687 INFO L85 PathProgramCache]: Analyzing trace with hash -850507468, now seen corresponding path program 1 times [2022-12-14 07:18:59,687 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 07:18:59,688 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1921370152] [2022-12-14 07:18:59,688 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 07:18:59,688 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 07:18:59,732 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 07:18:59,988 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 2 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 07:18:59,988 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 07:18:59,988 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1921370152] [2022-12-14 07:18:59,988 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1921370152] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 07:18:59,989 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1533407209] [2022-12-14 07:18:59,989 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 07:18:59,989 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 07:18:59,989 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_796726a8-e317-4db0-8bbd-479427385a6d/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 07:18:59,990 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_796726a8-e317-4db0-8bbd-479427385a6d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 07:18:59,991 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_796726a8-e317-4db0-8bbd-479427385a6d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-12-14 07:19:00,045 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 07:19:00,047 INFO L263 TraceCheckSpWp]: Trace formula consists of 141 conjuncts, 41 conjunts are in the unsatisfiable core [2022-12-14 07:19:00,048 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 07:19:00,052 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 [2022-12-14 07:19:00,082 INFO L321 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2022-12-14 07:19:00,082 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 11 treesize of output 11 [2022-12-14 07:19:00,088 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 14 [2022-12-14 07:19:00,118 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 11 treesize of output 7 [2022-12-14 07:19:00,123 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 11 treesize of output 7 [2022-12-14 07:19:00,187 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 07:19:00,188 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 1 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 13 [2022-12-14 07:19:00,194 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 07:19:00,194 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 7 [2022-12-14 07:19:00,231 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 2 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 07:19:00,231 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 07:19:00,380 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 21 treesize of output 19 [2022-12-14 07:19:00,384 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 19 treesize of output 17 [2022-12-14 07:19:00,387 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 36 treesize of output 34 [2022-12-14 07:19:00,391 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 62 treesize of output 58 [2022-12-14 07:19:00,430 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 10 treesize of output 8 [2022-12-14 07:19:00,433 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:19:00,564 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 55 treesize of output 51 [2022-12-14 07:19:00,623 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 2 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 07:19:00,624 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1533407209] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 07:19:00,624 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1011413696] [2022-12-14 07:19:00,626 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-12-14 07:19:00,626 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 07:19:00,626 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 07:19:00,626 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 07:19:00,626 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 07:19:00,659 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:19:00,660 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:19:00,661 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 22 [2022-12-14 07:19:00,688 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 11 treesize of output 7 [2022-12-14 07:19:00,693 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 11 treesize of output 7 [2022-12-14 07:19:00,699 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:19:00,700 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:19:00,701 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 30 treesize of output 21 [2022-12-14 07:19:00,715 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:19:00,715 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:19:00,716 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:19:00,717 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:19:00,718 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:19:00,719 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 8 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 22 treesize of output 30 [2022-12-14 07:19:00,756 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 07:19:00,765 INFO L321 Elim1Store]: treesize reduction 21, result has 25.0 percent of original size [2022-12-14 07:19:00,766 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 245 treesize of output 228 [2022-12-14 07:19:00,776 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 07:19:00,785 INFO L321 Elim1Store]: treesize reduction 17, result has 29.2 percent of original size [2022-12-14 07:19:00,786 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 241 treesize of output 240 [2022-12-14 07:19:00,795 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 07:19:00,804 INFO L321 Elim1Store]: treesize reduction 29, result has 27.5 percent of original size [2022-12-14 07:19:00,805 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 277 treesize of output 276 [2022-12-14 07:19:00,846 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:19:00,881 INFO L321 Elim1Store]: treesize reduction 106, result has 15.9 percent of original size [2022-12-14 07:19:00,881 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 3 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 8 case distinctions, treesize of input 277 treesize of output 280 [2022-12-14 07:19:00,951 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 07:19:00,961 INFO L321 Elim1Store]: treesize reduction 17, result has 29.2 percent of original size [2022-12-14 07:19:00,961 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 241 treesize of output 240 [2022-12-14 07:19:00,971 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 07:19:00,979 INFO L321 Elim1Store]: treesize reduction 21, result has 25.0 percent of original size [2022-12-14 07:19:00,980 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 281 treesize of output 264 [2022-12-14 07:19:00,989 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 07:19:00,998 INFO L321 Elim1Store]: treesize reduction 29, result has 27.5 percent of original size [2022-12-14 07:19:00,999 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 277 treesize of output 276 [2022-12-14 07:19:01,116 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:19:01,140 INFO L321 Elim1Store]: treesize reduction 106, result has 15.9 percent of original size [2022-12-14 07:19:01,141 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 3 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 8 case distinctions, treesize of input 277 treesize of output 280 [2022-12-14 07:19:01,166 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 07:19:01,795 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1002#(and (<= 0 |ULTIMATE.start_main_~s~0#1.offset|) (<= 1 |ULTIMATE.start_sll_length_~len~0#1|) (<= 0 |ULTIMATE.start_sll_length_#in~head#1.offset|) (<= |ULTIMATE.start_sll_length_#in~head#1.offset| 0) (<= |ULTIMATE.start_sll_create_~head~0#1.offset| 0) (<= |ULTIMATE.start_sll_create_~len#1| 0) (<= |ULTIMATE.start_sll_create_#res#1.offset| 0) (<= |ULTIMATE.start_sll_create_#in~len#1| 2) (<= 0 |ULTIMATE.start_sll_create_~len#1|) (= |#NULL.offset| 0) (or (not (<= 0 |ULTIMATE.start_sll_length_~head#1.offset|)) (not (<= (+ |ULTIMATE.start_sll_length_~head#1.offset| 4) (select |#length| |ULTIMATE.start_sll_length_~head#1.base|)))) (<= 0 |ULTIMATE.start_sll_create_#res#1.offset|) (= |ULTIMATE.start_main_~len~1#1| 2) (<= 0 |#StackHeapBarrier|) (<= 2 |ULTIMATE.start_sll_create_#in~len#1|) (<= |ULTIMATE.start_main_~s~0#1.offset| 0) (<= 0 |ULTIMATE.start_sll_create_~head~0#1.offset|) (= |#NULL.base| 0))' at error location [2022-12-14 07:19:01,796 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 07:19:01,796 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 07:19:01,796 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 18 [2022-12-14 07:19:01,796 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1705901109] [2022-12-14 07:19:01,796 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 07:19:01,796 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2022-12-14 07:19:01,796 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 07:19:01,796 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2022-12-14 07:19:01,797 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=79, Invalid=623, Unknown=0, NotChecked=0, Total=702 [2022-12-14 07:19:01,797 INFO L87 Difference]: Start difference. First operand 34 states and 39 transitions. Second operand has 19 states, 18 states have (on average 2.0555555555555554) internal successors, (37), 19 states have internal predecessors, (37), 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) [2022-12-14 07:19:02,267 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 07:19:02,267 INFO L93 Difference]: Finished difference Result 75 states and 79 transitions. [2022-12-14 07:19:02,267 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2022-12-14 07:19:02,267 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 18 states have (on average 2.0555555555555554) internal successors, (37), 19 states have internal predecessors, (37), 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 15 [2022-12-14 07:19:02,268 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 07:19:02,268 INFO L225 Difference]: With dead ends: 75 [2022-12-14 07:19:02,268 INFO L226 Difference]: Without dead ends: 75 [2022-12-14 07:19:02,268 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 59 GetRequests, 24 SyntacticMatches, 1 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 204 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=204, Invalid=1056, Unknown=0, NotChecked=0, Total=1260 [2022-12-14 07:19:02,269 INFO L413 NwaCegarLoop]: 12 mSDtfsCounter, 554 mSDsluCounter, 87 mSDsCounter, 0 mSdLazyCounter, 215 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 554 SdHoareTripleChecker+Valid, 99 SdHoareTripleChecker+Invalid, 223 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 215 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 07:19:02,269 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [554 Valid, 99 Invalid, 223 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 215 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 07:19:02,269 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2022-12-14 07:19:02,270 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 34. [2022-12-14 07:19:02,270 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 34 states, 25 states have (on average 1.52) internal successors, (38), 33 states have internal predecessors, (38), 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) [2022-12-14 07:19:02,271 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 38 transitions. [2022-12-14 07:19:02,271 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 38 transitions. Word has length 15 [2022-12-14 07:19:02,271 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 07:19:02,271 INFO L495 AbstractCegarLoop]: Abstraction has 34 states and 38 transitions. [2022-12-14 07:19:02,271 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 18 states have (on average 2.0555555555555554) internal successors, (37), 19 states have internal predecessors, (37), 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) [2022-12-14 07:19:02,271 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 38 transitions. [2022-12-14 07:19:02,271 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2022-12-14 07:19:02,271 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 07:19:02,271 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 07:19:02,275 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_796726a8-e317-4db0-8bbd-479427385a6d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Ended with exit code 0 [2022-12-14 07:19:02,472 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_796726a8-e317-4db0-8bbd-479427385a6d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 07:19:02,473 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr9ASSERT_VIOLATIONMEMORY_LEAK === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 8 more)] === [2022-12-14 07:19:02,474 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 07:19:02,474 INFO L85 PathProgramCache]: Analyzing trace with hash -595872548, now seen corresponding path program 1 times [2022-12-14 07:19:02,474 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 07:19:02,475 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1079498890] [2022-12-14 07:19:02,475 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 07:19:02,475 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 07:19:02,504 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 07:19:02,610 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 07:19:02,611 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 07:19:02,611 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1079498890] [2022-12-14 07:19:02,611 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1079498890] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 07:19:02,611 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2000995288] [2022-12-14 07:19:02,611 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 07:19:02,611 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 07:19:02,611 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_796726a8-e317-4db0-8bbd-479427385a6d/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 07:19:02,612 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_796726a8-e317-4db0-8bbd-479427385a6d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 07:19:02,613 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_796726a8-e317-4db0-8bbd-479427385a6d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2022-12-14 07:19:02,668 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 07:19:02,669 INFO L263 TraceCheckSpWp]: Trace formula consists of 149 conjuncts, 33 conjunts are in the unsatisfiable core [2022-12-14 07:19:02,671 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 07:19:02,688 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 11 treesize of output 7 [2022-12-14 07:19:02,712 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 16 treesize of output 8 [2022-12-14 07:19:02,713 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 07:19:02,713 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 07:19:02,723 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 07:19:02,724 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2000995288] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 07:19:02,724 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [143474851] [2022-12-14 07:19:02,725 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2022-12-14 07:19:02,726 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 07:19:02,726 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 07:19:02,726 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 07:19:02,726 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 07:19:02,752 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:19:02,753 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:19:02,754 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 22 [2022-12-14 07:19:02,769 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:19:02,770 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:19:02,771 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 30 treesize of output 21 [2022-12-14 07:19:02,776 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 11 treesize of output 7 [2022-12-14 07:19:02,781 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 11 treesize of output 7 [2022-12-14 07:19:02,793 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:19:02,794 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:19:02,795 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:19:02,795 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:19:02,796 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:19:02,797 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 8 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 29 treesize of output 35 [2022-12-14 07:19:02,836 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 07:19:02,847 INFO L321 Elim1Store]: treesize reduction 17, result has 29.2 percent of original size [2022-12-14 07:19:02,848 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 241 treesize of output 240 [2022-12-14 07:19:02,859 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 07:19:02,869 INFO L321 Elim1Store]: treesize reduction 21, result has 34.4 percent of original size [2022-12-14 07:19:02,869 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 257 treesize of output 256 [2022-12-14 07:19:02,876 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 07:19:02,885 INFO L321 Elim1Store]: treesize reduction 21, result has 25.0 percent of original size [2022-12-14 07:19:02,885 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 297 treesize of output 280 [2022-12-14 07:19:02,923 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:19:02,954 INFO L321 Elim1Store]: treesize reduction 106, result has 15.9 percent of original size [2022-12-14 07:19:02,955 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 3 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 8 case distinctions, treesize of input 285 treesize of output 288 [2022-12-14 07:19:03,023 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 07:19:03,034 INFO L321 Elim1Store]: treesize reduction 17, result has 29.2 percent of original size [2022-12-14 07:19:03,035 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 241 treesize of output 240 [2022-12-14 07:19:03,045 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 07:19:03,056 INFO L321 Elim1Store]: treesize reduction 21, result has 34.4 percent of original size [2022-12-14 07:19:03,056 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 257 treesize of output 256 [2022-12-14 07:19:03,065 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 07:19:03,074 INFO L321 Elim1Store]: treesize reduction 21, result has 25.0 percent of original size [2022-12-14 07:19:03,075 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 297 treesize of output 280 [2022-12-14 07:19:03,195 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:19:03,237 INFO L321 Elim1Store]: treesize reduction 106, result has 15.9 percent of original size [2022-12-14 07:19:03,238 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 3 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 8 case distinctions, treesize of input 285 treesize of output 288 [2022-12-14 07:19:03,270 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 07:19:03,940 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1237#(and (<= 0 |ULTIMATE.start_main_~s~0#1.offset|) (= |ULTIMATE.start_sll_length_~head#1.base| 0) (<= |ULTIMATE.start_sll_length_#res#1| 2147483647) (<= 0 |ULTIMATE.start_sll_length_#in~head#1.offset|) (<= |ULTIMATE.start_sll_length_#in~head#1.offset| 0) (<= |ULTIMATE.start_sll_create_~head~0#1.offset| 0) (<= 0 |ULTIMATE.start_sll_length_~len~0#1|) (<= |ULTIMATE.start_sll_create_~len#1| 0) (<= |ULTIMATE.start_sll_create_#res#1.offset| 0) (<= |ULTIMATE.start_sll_create_#in~len#1| 2) (<= 0 |ULTIMATE.start_sll_create_~len#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start_sll_length_~head#1.offset| 0) (= |ULTIMATE.start_sll_length_~len~0#1| |ULTIMATE.start_sll_length_#res#1|) (<= 0 |ULTIMATE.start_sll_create_#res#1.offset|) (= |ULTIMATE.start_main_~len~1#1| 2) (<= 0 |#StackHeapBarrier|) (<= 2 |ULTIMATE.start_sll_create_#in~len#1|) (<= |ULTIMATE.start_main_~s~0#1.offset| 0) (not (= |ULTIMATE.start_sll_length_#res#1| |ULTIMATE.start_main_~len~1#1|)) (<= 0 |ULTIMATE.start_sll_create_~head~0#1.offset|) (= |#NULL.base| 0))' at error location [2022-12-14 07:19:03,940 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 07:19:03,940 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 07:19:03,940 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 8, 7] total 10 [2022-12-14 07:19:03,940 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [395856275] [2022-12-14 07:19:03,940 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 07:19:03,941 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2022-12-14 07:19:03,941 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 07:19:03,941 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2022-12-14 07:19:03,941 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=292, Unknown=0, NotChecked=0, Total=342 [2022-12-14 07:19:03,941 INFO L87 Difference]: Start difference. First operand 34 states and 38 transitions. Second operand has 10 states, 10 states have (on average 2.2) internal successors, (22), 10 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) [2022-12-14 07:19:04,029 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 07:19:04,029 INFO L93 Difference]: Finished difference Result 36 states and 39 transitions. [2022-12-14 07:19:04,030 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2022-12-14 07:19:04,030 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 2.2) internal successors, (22), 10 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) Word has length 16 [2022-12-14 07:19:04,030 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 07:19:04,030 INFO L225 Difference]: With dead ends: 36 [2022-12-14 07:19:04,030 INFO L226 Difference]: Without dead ends: 36 [2022-12-14 07:19:04,030 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 36 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 82 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=94, Invalid=458, Unknown=0, NotChecked=0, Total=552 [2022-12-14 07:19:04,031 INFO L413 NwaCegarLoop]: 21 mSDtfsCounter, 105 mSDsluCounter, 51 mSDsCounter, 0 mSdLazyCounter, 64 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 105 SdHoareTripleChecker+Valid, 72 SdHoareTripleChecker+Invalid, 66 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 64 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-12-14 07:19:04,031 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [105 Valid, 72 Invalid, 66 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 64 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-12-14 07:19:04,032 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2022-12-14 07:19:04,033 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 34. [2022-12-14 07:19:04,033 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 34 states, 25 states have (on average 1.48) internal successors, (37), 33 states have internal predecessors, (37), 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) [2022-12-14 07:19:04,033 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 37 transitions. [2022-12-14 07:19:04,034 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 37 transitions. Word has length 16 [2022-12-14 07:19:04,034 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 07:19:04,034 INFO L495 AbstractCegarLoop]: Abstraction has 34 states and 37 transitions. [2022-12-14 07:19:04,034 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 2.2) internal successors, (22), 10 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) [2022-12-14 07:19:04,034 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 37 transitions. [2022-12-14 07:19:04,034 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2022-12-14 07:19:04,034 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 07:19:04,035 INFO L195 NwaCegarLoop]: trace histogram [3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1] [2022-12-14 07:19:04,039 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_796726a8-e317-4db0-8bbd-479427385a6d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Ended with exit code 0 [2022-12-14 07:19:04,235 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_796726a8-e317-4db0-8bbd-479427385a6d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 07:19:04,236 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 8 more)] === [2022-12-14 07:19:04,237 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 07:19:04,238 INFO L85 PathProgramCache]: Analyzing trace with hash -1293842554, now seen corresponding path program 2 times [2022-12-14 07:19:04,238 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 07:19:04,238 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1281314384] [2022-12-14 07:19:04,238 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 07:19:04,239 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 07:19:04,261 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 07:19:04,463 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 2 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 07:19:04,463 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 07:19:04,463 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1281314384] [2022-12-14 07:19:04,464 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1281314384] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 07:19:04,464 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1719758838] [2022-12-14 07:19:04,464 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 07:19:04,464 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 07:19:04,464 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_796726a8-e317-4db0-8bbd-479427385a6d/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 07:19:04,465 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_796726a8-e317-4db0-8bbd-479427385a6d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 07:19:04,465 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_796726a8-e317-4db0-8bbd-479427385a6d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2022-12-14 07:19:04,522 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2022-12-14 07:19:04,522 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 07:19:04,524 INFO L263 TraceCheckSpWp]: Trace formula consists of 152 conjuncts, 58 conjunts are in the unsatisfiable core [2022-12-14 07:19:04,526 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 07:19:04,533 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 [2022-12-14 07:19:04,556 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 11 treesize of output 7 [2022-12-14 07:19:04,560 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 11 treesize of output 7 [2022-12-14 07:19:04,583 INFO L321 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2022-12-14 07:19:04,583 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 11 treesize of output 11 [2022-12-14 07:19:04,615 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 18 [2022-12-14 07:19:04,619 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 22 [2022-12-14 07:19:04,805 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 07:19:04,807 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 07:19:04,807 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 07:19:04,813 INFO L321 Elim1Store]: treesize reduction 22, result has 12.0 percent of original size [2022-12-14 07:19:04,813 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 5 new quantified variables, introduced 5 case distinctions, treesize of input 61 treesize of output 38 [2022-12-14 07:19:04,819 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 07:19:04,823 INFO L321 Elim1Store]: treesize reduction 5, result has 37.5 percent of original size [2022-12-14 07:19:04,823 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 1 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 1 case distinctions, treesize of input 26 treesize of output 16 [2022-12-14 07:19:04,826 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 2 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 07:19:04,827 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 07:19:05,204 INFO L321 Elim1Store]: treesize reduction 79, result has 22.5 percent of original size [2022-12-14 07:19:05,204 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 280 treesize of output 232 [2022-12-14 07:19:05,212 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-12-14 07:19:05,212 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 1 new quantified variables, introduced 1 case distinctions, treesize of input 228 treesize of output 180 [2022-12-14 07:19:05,222 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-12-14 07:19:05,222 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 180 treesize of output 172 [2022-12-14 07:19:05,233 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-12-14 07:19:05,233 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 3 new quantified variables, introduced 1 case distinctions, treesize of input 158 treesize of output 154 [2022-12-14 07:19:05,251 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 11 treesize of output 4 [2022-12-14 07:19:05,263 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 6 treesize of output 4 [2022-12-14 07:19:05,272 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:19:05,274 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 59 treesize of output 52 [2022-12-14 07:19:05,293 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:19:05,295 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 34 treesize of output 32 [2022-12-14 07:19:05,367 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-12-14 07:19:05,367 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 1 new quantified variables, introduced 1 case distinctions, treesize of input 61 treesize of output 62 [2022-12-14 07:19:05,371 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:19:05,374 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:19:05,383 INFO L321 Elim1Store]: treesize reduction 40, result has 16.7 percent of original size [2022-12-14 07:19:05,383 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 202 treesize of output 147 [2022-12-14 07:19:05,396 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-12-14 07:19:05,397 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 136 treesize of output 130 [2022-12-14 07:19:05,408 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-12-14 07:19:05,408 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 124 treesize of output 122 [2022-12-14 07:19:05,429 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 6 treesize of output 4 [2022-12-14 07:19:05,444 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 6 treesize of output 4 [2022-12-14 07:19:05,451 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:19:05,453 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 54 treesize of output 52 [2022-12-14 07:19:05,470 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:19:05,473 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 18 treesize of output 16 [2022-12-14 07:19:05,628 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 2 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 07:19:05,628 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1719758838] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 07:19:05,628 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [665975054] [2022-12-14 07:19:05,630 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-12-14 07:19:05,630 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 07:19:05,630 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 07:19:05,631 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 07:19:05,631 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 07:19:05,655 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:19:05,656 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:19:05,657 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 22 [2022-12-14 07:19:05,674 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 11 treesize of output 7 [2022-12-14 07:19:05,680 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 11 treesize of output 7 [2022-12-14 07:19:05,688 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:19:05,688 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:19:05,689 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 30 treesize of output 21 [2022-12-14 07:19:05,703 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:19:05,704 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:19:05,705 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:19:05,706 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:19:05,706 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:19:05,707 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 8 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 22 treesize of output 30 [2022-12-14 07:19:05,754 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 07:19:05,763 INFO L321 Elim1Store]: treesize reduction 17, result has 29.2 percent of original size [2022-12-14 07:19:05,763 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 241 treesize of output 240 [2022-12-14 07:19:05,772 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 07:19:05,781 INFO L321 Elim1Store]: treesize reduction 21, result has 25.0 percent of original size [2022-12-14 07:19:05,781 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 281 treesize of output 264 [2022-12-14 07:19:05,788 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 07:19:05,797 INFO L321 Elim1Store]: treesize reduction 29, result has 27.5 percent of original size [2022-12-14 07:19:05,797 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 277 treesize of output 276 [2022-12-14 07:19:05,840 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:19:05,865 INFO L321 Elim1Store]: treesize reduction 106, result has 15.9 percent of original size [2022-12-14 07:19:05,866 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 3 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 8 case distinctions, treesize of input 277 treesize of output 280 [2022-12-14 07:19:05,924 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 07:19:05,933 INFO L321 Elim1Store]: treesize reduction 17, result has 29.2 percent of original size [2022-12-14 07:19:05,933 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 241 treesize of output 240 [2022-12-14 07:19:05,941 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 07:19:05,948 INFO L321 Elim1Store]: treesize reduction 29, result has 27.5 percent of original size [2022-12-14 07:19:05,949 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 277 treesize of output 276 [2022-12-14 07:19:05,956 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 07:19:05,965 INFO L321 Elim1Store]: treesize reduction 21, result has 25.0 percent of original size [2022-12-14 07:19:05,965 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 289 treesize of output 272 [2022-12-14 07:19:06,061 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:19:06,087 INFO L321 Elim1Store]: treesize reduction 106, result has 15.9 percent of original size [2022-12-14 07:19:06,087 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 3 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 8 case distinctions, treesize of input 277 treesize of output 280 [2022-12-14 07:19:06,113 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 07:19:06,688 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1442#(and (<= 0 |ULTIMATE.start_main_~s~0#1.offset|) (<= 1 |ULTIMATE.start_sll_length_~len~0#1|) (not (= (select |#valid| |ULTIMATE.start_sll_length_~head#1.base|) 1)) (<= 0 |ULTIMATE.start_sll_length_#in~head#1.offset|) (<= |ULTIMATE.start_sll_length_#in~head#1.offset| 0) (<= |ULTIMATE.start_sll_create_~head~0#1.offset| 0) (<= |ULTIMATE.start_sll_create_~len#1| 0) (<= |ULTIMATE.start_sll_create_#res#1.offset| 0) (<= |ULTIMATE.start_sll_create_#in~len#1| 2) (<= 0 |ULTIMATE.start_sll_create_~len#1|) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_sll_create_#res#1.offset|) (= |ULTIMATE.start_main_~len~1#1| 2) (<= 0 |#StackHeapBarrier|) (<= 2 |ULTIMATE.start_sll_create_#in~len#1|) (<= |ULTIMATE.start_main_~s~0#1.offset| 0) (<= 0 |ULTIMATE.start_sll_create_~head~0#1.offset|) (= |#NULL.base| 0))' at error location [2022-12-14 07:19:06,688 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 07:19:06,688 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 07:19:06,688 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 10, 10] total 20 [2022-12-14 07:19:06,688 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [334715175] [2022-12-14 07:19:06,688 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 07:19:06,688 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2022-12-14 07:19:06,688 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 07:19:06,689 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2022-12-14 07:19:06,689 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=74, Invalid=682, Unknown=0, NotChecked=0, Total=756 [2022-12-14 07:19:06,689 INFO L87 Difference]: Start difference. First operand 34 states and 37 transitions. Second operand has 20 states, 20 states have (on average 1.85) internal successors, (37), 20 states have internal predecessors, (37), 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) [2022-12-14 07:19:07,065 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 07:19:07,065 INFO L93 Difference]: Finished difference Result 59 states and 63 transitions. [2022-12-14 07:19:07,065 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2022-12-14 07:19:07,065 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 1.85) internal successors, (37), 20 states have internal predecessors, (37), 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 17 [2022-12-14 07:19:07,065 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 07:19:07,066 INFO L225 Difference]: With dead ends: 59 [2022-12-14 07:19:07,066 INFO L226 Difference]: Without dead ends: 59 [2022-12-14 07:19:07,066 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 63 GetRequests, 32 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 173 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=111, Invalid=945, Unknown=0, NotChecked=0, Total=1056 [2022-12-14 07:19:07,066 INFO L413 NwaCegarLoop]: 21 mSDtfsCounter, 103 mSDsluCounter, 217 mSDsCounter, 0 mSdLazyCounter, 234 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 103 SdHoareTripleChecker+Valid, 238 SdHoareTripleChecker+Invalid, 238 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 234 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-12-14 07:19:07,067 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [103 Valid, 238 Invalid, 238 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 234 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-12-14 07:19:07,067 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2022-12-14 07:19:07,068 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 42. [2022-12-14 07:19:07,068 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 42 states, 33 states have (on average 1.393939393939394) internal successors, (46), 41 states have internal predecessors, (46), 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) [2022-12-14 07:19:07,068 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 46 transitions. [2022-12-14 07:19:07,069 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 46 transitions. Word has length 17 [2022-12-14 07:19:07,069 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 07:19:07,069 INFO L495 AbstractCegarLoop]: Abstraction has 42 states and 46 transitions. [2022-12-14 07:19:07,069 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 20 states have (on average 1.85) internal successors, (37), 20 states have internal predecessors, (37), 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) [2022-12-14 07:19:07,069 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 46 transitions. [2022-12-14 07:19:07,069 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2022-12-14 07:19:07,069 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 07:19:07,069 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 07:19:07,073 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_796726a8-e317-4db0-8bbd-479427385a6d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Ended with exit code 0 [2022-12-14 07:19:07,270 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_796726a8-e317-4db0-8bbd-479427385a6d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2022-12-14 07:19:07,271 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr9ASSERT_VIOLATIONMEMORY_LEAK === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 8 more)] === [2022-12-14 07:19:07,272 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 07:19:07,272 INFO L85 PathProgramCache]: Analyzing trace with hash -1454358295, now seen corresponding path program 2 times [2022-12-14 07:19:07,273 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 07:19:07,273 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1822810678] [2022-12-14 07:19:07,273 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 07:19:07,273 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 07:19:07,306 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 07:19:07,385 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2022-12-14 07:19:07,385 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 07:19:07,386 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1822810678] [2022-12-14 07:19:07,386 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1822810678] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 07:19:07,386 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1692699019] [2022-12-14 07:19:07,386 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 07:19:07,386 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 07:19:07,386 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_796726a8-e317-4db0-8bbd-479427385a6d/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 07:19:07,387 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_796726a8-e317-4db0-8bbd-479427385a6d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 07:19:07,388 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_796726a8-e317-4db0-8bbd-479427385a6d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2022-12-14 07:19:07,448 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2022-12-14 07:19:07,448 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 07:19:07,450 INFO L263 TraceCheckSpWp]: Trace formula consists of 160 conjuncts, 13 conjunts are in the unsatisfiable core [2022-12-14 07:19:07,451 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 07:19:07,517 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2022-12-14 07:19:07,517 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 07:19:07,562 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2022-12-14 07:19:07,562 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1692699019] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 07:19:07,562 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1978328489] [2022-12-14 07:19:07,563 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2022-12-14 07:19:07,564 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 07:19:07,564 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 07:19:07,564 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 07:19:07,564 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 07:19:07,593 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:19:07,594 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:19:07,595 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 22 [2022-12-14 07:19:07,615 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:19:07,616 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:19:07,616 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 30 treesize of output 21 [2022-12-14 07:19:07,622 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 11 treesize of output 7 [2022-12-14 07:19:07,627 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 11 treesize of output 7 [2022-12-14 07:19:07,637 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:19:07,637 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:19:07,638 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:19:07,639 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:19:07,639 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:19:07,640 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 8 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 22 treesize of output 30 [2022-12-14 07:19:07,683 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 07:19:07,691 INFO L321 Elim1Store]: treesize reduction 21, result has 25.0 percent of original size [2022-12-14 07:19:07,692 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 245 treesize of output 228 [2022-12-14 07:19:07,699 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 07:19:07,705 INFO L321 Elim1Store]: treesize reduction 17, result has 29.2 percent of original size [2022-12-14 07:19:07,705 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 241 treesize of output 240 [2022-12-14 07:19:07,712 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 07:19:07,719 INFO L321 Elim1Store]: treesize reduction 17, result has 29.2 percent of original size [2022-12-14 07:19:07,719 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 249 treesize of output 248 [2022-12-14 07:19:07,754 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:19:07,789 INFO L321 Elim1Store]: treesize reduction 106, result has 15.9 percent of original size [2022-12-14 07:19:07,790 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 3 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 8 case distinctions, treesize of input 277 treesize of output 280 [2022-12-14 07:19:07,853 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 07:19:07,861 INFO L321 Elim1Store]: treesize reduction 21, result has 25.0 percent of original size [2022-12-14 07:19:07,861 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 245 treesize of output 228 [2022-12-14 07:19:07,868 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 07:19:07,876 INFO L321 Elim1Store]: treesize reduction 17, result has 29.2 percent of original size [2022-12-14 07:19:07,876 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 241 treesize of output 240 [2022-12-14 07:19:07,886 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 07:19:07,894 INFO L321 Elim1Store]: treesize reduction 29, result has 27.5 percent of original size [2022-12-14 07:19:07,894 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 277 treesize of output 276 [2022-12-14 07:19:08,022 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:19:08,045 INFO L321 Elim1Store]: treesize reduction 106, result has 15.9 percent of original size [2022-12-14 07:19:08,045 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 3 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 8 case distinctions, treesize of input 277 treesize of output 280 [2022-12-14 07:19:08,078 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 07:19:08,840 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1674#(and (<= 0 |ULTIMATE.start_main_~s~0#1.offset|) (= |ULTIMATE.start_sll_length_~head#1.base| 0) (<= |ULTIMATE.start_sll_length_#res#1| 2147483647) (<= 0 |ULTIMATE.start_sll_length_#in~head#1.offset|) (<= |ULTIMATE.start_sll_length_#in~head#1.offset| 0) (<= |ULTIMATE.start_sll_create_~head~0#1.offset| 0) (<= 0 |ULTIMATE.start_sll_length_~len~0#1|) (<= |ULTIMATE.start_sll_create_~len#1| 0) (<= |ULTIMATE.start_sll_create_#res#1.offset| 0) (<= |ULTIMATE.start_sll_create_#in~len#1| 2) (<= 0 |ULTIMATE.start_sll_create_~len#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start_sll_length_~head#1.offset| 0) (= |ULTIMATE.start_sll_length_~len~0#1| |ULTIMATE.start_sll_length_#res#1|) (<= 0 |ULTIMATE.start_sll_create_#res#1.offset|) (= |ULTIMATE.start_main_~len~1#1| 2) (<= 0 |#StackHeapBarrier|) (<= 2 |ULTIMATE.start_sll_create_#in~len#1|) (<= |ULTIMATE.start_main_~s~0#1.offset| 0) (not (= |ULTIMATE.start_sll_length_#res#1| |ULTIMATE.start_main_~len~1#1|)) (<= 0 |ULTIMATE.start_sll_create_~head~0#1.offset|) (= |#NULL.base| 0))' at error location [2022-12-14 07:19:08,840 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 07:19:08,840 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 07:19:08,841 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 10 [2022-12-14 07:19:08,841 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2090495919] [2022-12-14 07:19:08,841 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 07:19:08,841 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2022-12-14 07:19:08,841 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 07:19:08,841 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2022-12-14 07:19:08,842 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=65, Invalid=315, Unknown=0, NotChecked=0, Total=380 [2022-12-14 07:19:08,842 INFO L87 Difference]: Start difference. First operand 42 states and 46 transitions. Second operand has 11 states, 11 states have (on average 2.090909090909091) internal successors, (23), 10 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) [2022-12-14 07:19:08,907 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 07:19:08,907 INFO L93 Difference]: Finished difference Result 97 states and 106 transitions. [2022-12-14 07:19:08,907 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2022-12-14 07:19:08,907 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 2.090909090909091) internal successors, (23), 10 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) Word has length 18 [2022-12-14 07:19:08,907 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 07:19:08,908 INFO L225 Difference]: With dead ends: 97 [2022-12-14 07:19:08,908 INFO L226 Difference]: Without dead ends: 97 [2022-12-14 07:19:08,908 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 59 GetRequests, 37 SyntacticMatches, 3 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 79 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=72, Invalid=348, Unknown=0, NotChecked=0, Total=420 [2022-12-14 07:19:08,908 INFO L413 NwaCegarLoop]: 18 mSDtfsCounter, 35 mSDsluCounter, 156 mSDsCounter, 0 mSdLazyCounter, 147 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 35 SdHoareTripleChecker+Valid, 174 SdHoareTripleChecker+Invalid, 147 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 147 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 07:19:08,908 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [35 Valid, 174 Invalid, 147 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 147 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 07:19:08,909 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 97 states. [2022-12-14 07:19:08,910 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 97 to 66. [2022-12-14 07:19:08,911 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 66 states, 57 states have (on average 1.2982456140350878) internal successors, (74), 65 states have internal predecessors, (74), 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) [2022-12-14 07:19:08,911 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 74 transitions. [2022-12-14 07:19:08,911 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 74 transitions. Word has length 18 [2022-12-14 07:19:08,911 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 07:19:08,911 INFO L495 AbstractCegarLoop]: Abstraction has 66 states and 74 transitions. [2022-12-14 07:19:08,911 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 11 states have (on average 2.090909090909091) internal successors, (23), 10 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) [2022-12-14 07:19:08,911 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 74 transitions. [2022-12-14 07:19:08,912 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2022-12-14 07:19:08,912 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 07:19:08,912 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 07:19:08,917 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_796726a8-e317-4db0-8bbd-479427385a6d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Ended with exit code 0 [2022-12-14 07:19:09,113 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_796726a8-e317-4db0-8bbd-479427385a6d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 07:19:09,114 INFO L420 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr4REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 8 more)] === [2022-12-14 07:19:09,115 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 07:19:09,115 INFO L85 PathProgramCache]: Analyzing trace with hash -2135432676, now seen corresponding path program 1 times [2022-12-14 07:19:09,116 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 07:19:09,116 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [414790243] [2022-12-14 07:19:09,116 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 07:19:09,116 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 07:19:09,128 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 07:19:09,165 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2022-12-14 07:19:09,165 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 07:19:09,165 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [414790243] [2022-12-14 07:19:09,165 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [414790243] provided 1 perfect and 0 imperfect interpolant sequences [2022-12-14 07:19:09,165 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-12-14 07:19:09,165 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-12-14 07:19:09,165 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1842213866] [2022-12-14 07:19:09,165 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-12-14 07:19:09,166 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-12-14 07:19:09,166 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 07:19:09,166 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-12-14 07:19:09,166 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-12-14 07:19:09,167 INFO L87 Difference]: Start difference. First operand 66 states and 74 transitions. Second operand has 5 states, 4 states have (on average 3.75) internal successors, (15), 5 states have internal predecessors, (15), 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) [2022-12-14 07:19:09,206 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 07:19:09,206 INFO L93 Difference]: Finished difference Result 75 states and 83 transitions. [2022-12-14 07:19:09,206 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-12-14 07:19:09,206 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 3.75) internal successors, (15), 5 states have internal predecessors, (15), 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 [2022-12-14 07:19:09,207 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 07:19:09,207 INFO L225 Difference]: With dead ends: 75 [2022-12-14 07:19:09,207 INFO L226 Difference]: Without dead ends: 75 [2022-12-14 07:19:09,207 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2022-12-14 07:19:09,208 INFO L413 NwaCegarLoop]: 13 mSDtfsCounter, 45 mSDsluCounter, 25 mSDsCounter, 0 mSdLazyCounter, 58 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 45 SdHoareTripleChecker+Valid, 38 SdHoareTripleChecker+Invalid, 62 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 58 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-12-14 07:19:09,208 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [45 Valid, 38 Invalid, 62 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 58 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-12-14 07:19:09,209 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2022-12-14 07:19:09,210 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 67. [2022-12-14 07:19:09,210 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 67 states, 59 states have (on average 1.305084745762712) internal successors, (77), 66 states have internal predecessors, (77), 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) [2022-12-14 07:19:09,211 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 77 transitions. [2022-12-14 07:19:09,211 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 77 transitions. Word has length 19 [2022-12-14 07:19:09,211 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 07:19:09,211 INFO L495 AbstractCegarLoop]: Abstraction has 67 states and 77 transitions. [2022-12-14 07:19:09,211 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 3.75) internal successors, (15), 5 states have internal predecessors, (15), 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) [2022-12-14 07:19:09,211 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 77 transitions. [2022-12-14 07:19:09,212 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2022-12-14 07:19:09,212 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 07:19:09,212 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 07:19:09,212 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2022-12-14 07:19:09,212 INFO L420 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 8 more)] === [2022-12-14 07:19:09,213 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 07:19:09,213 INFO L85 PathProgramCache]: Analyzing trace with hash -2135432675, now seen corresponding path program 1 times [2022-12-14 07:19:09,213 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 07:19:09,213 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [402779611] [2022-12-14 07:19:09,213 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 07:19:09,213 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 07:19:09,222 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 07:19:09,293 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2022-12-14 07:19:09,294 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 07:19:09,294 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [402779611] [2022-12-14 07:19:09,294 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [402779611] provided 1 perfect and 0 imperfect interpolant sequences [2022-12-14 07:19:09,294 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-12-14 07:19:09,294 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-12-14 07:19:09,294 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1943520444] [2022-12-14 07:19:09,294 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-12-14 07:19:09,294 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-12-14 07:19:09,294 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 07:19:09,295 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-12-14 07:19:09,295 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2022-12-14 07:19:09,295 INFO L87 Difference]: Start difference. First operand 67 states and 77 transitions. Second operand has 6 states, 5 states have (on average 3.4) internal successors, (17), 6 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) [2022-12-14 07:19:09,364 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 07:19:09,364 INFO L93 Difference]: Finished difference Result 73 states and 81 transitions. [2022-12-14 07:19:09,364 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-12-14 07:19:09,364 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 3.4) internal successors, (17), 6 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) Word has length 19 [2022-12-14 07:19:09,364 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 07:19:09,365 INFO L225 Difference]: With dead ends: 73 [2022-12-14 07:19:09,365 INFO L226 Difference]: Without dead ends: 73 [2022-12-14 07:19:09,365 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=27, Invalid=45, Unknown=0, NotChecked=0, Total=72 [2022-12-14 07:19:09,366 INFO L413 NwaCegarLoop]: 11 mSDtfsCounter, 88 mSDsluCounter, 15 mSDsCounter, 0 mSdLazyCounter, 58 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 88 SdHoareTripleChecker+Valid, 26 SdHoareTripleChecker+Invalid, 60 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 58 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-12-14 07:19:09,366 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [88 Valid, 26 Invalid, 60 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 58 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-12-14 07:19:09,366 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73 states. [2022-12-14 07:19:09,367 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73 to 68. [2022-12-14 07:19:09,367 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 68 states, 60 states have (on average 1.2833333333333334) internal successors, (77), 67 states have internal predecessors, (77), 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) [2022-12-14 07:19:09,368 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 77 transitions. [2022-12-14 07:19:09,368 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 77 transitions. Word has length 19 [2022-12-14 07:19:09,368 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 07:19:09,368 INFO L495 AbstractCegarLoop]: Abstraction has 68 states and 77 transitions. [2022-12-14 07:19:09,368 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 3.4) internal successors, (17), 6 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) [2022-12-14 07:19:09,368 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 77 transitions. [2022-12-14 07:19:09,369 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2022-12-14 07:19:09,369 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 07:19:09,369 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 07:19:09,369 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2022-12-14 07:19:09,369 INFO L420 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr10ASSERT_VIOLATIONMEMORY_LEAK === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 8 more)] === [2022-12-14 07:19:09,370 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 07:19:09,370 INFO L85 PathProgramCache]: Analyzing trace with hash -2135431574, now seen corresponding path program 1 times [2022-12-14 07:19:09,370 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 07:19:09,370 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [112245405] [2022-12-14 07:19:09,370 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 07:19:09,370 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 07:19:09,378 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 07:19:09,423 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 4 proven. 2 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-12-14 07:19:09,423 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 07:19:09,423 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [112245405] [2022-12-14 07:19:09,424 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [112245405] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 07:19:09,424 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1771980035] [2022-12-14 07:19:09,424 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 07:19:09,424 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 07:19:09,424 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_796726a8-e317-4db0-8bbd-479427385a6d/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 07:19:09,425 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_796726a8-e317-4db0-8bbd-479427385a6d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 07:19:09,426 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_796726a8-e317-4db0-8bbd-479427385a6d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2022-12-14 07:19:09,491 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 07:19:09,492 INFO L263 TraceCheckSpWp]: Trace formula consists of 175 conjuncts, 13 conjunts are in the unsatisfiable core [2022-12-14 07:19:09,493 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 07:19:09,514 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2022-12-14 07:19:09,514 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-12-14 07:19:09,515 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1771980035] provided 1 perfect and 0 imperfect interpolant sequences [2022-12-14 07:19:09,515 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-12-14 07:19:09,515 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [7] total 9 [2022-12-14 07:19:09,515 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1416831700] [2022-12-14 07:19:09,515 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-12-14 07:19:09,515 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-12-14 07:19:09,515 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 07:19:09,516 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-12-14 07:19:09,516 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=57, Unknown=0, NotChecked=0, Total=72 [2022-12-14 07:19:09,516 INFO L87 Difference]: Start difference. First operand 68 states and 77 transitions. Second operand has 6 states, 6 states have (on average 2.8333333333333335) internal successors, (17), 6 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) [2022-12-14 07:19:09,562 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 07:19:09,562 INFO L93 Difference]: Finished difference Result 71 states and 79 transitions. [2022-12-14 07:19:09,562 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-12-14 07:19:09,562 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 2.8333333333333335) internal successors, (17), 6 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) Word has length 19 [2022-12-14 07:19:09,562 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 07:19:09,563 INFO L225 Difference]: With dead ends: 71 [2022-12-14 07:19:09,563 INFO L226 Difference]: Without dead ends: 71 [2022-12-14 07:19:09,563 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 18 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=33, Invalid=99, Unknown=0, NotChecked=0, Total=132 [2022-12-14 07:19:09,563 INFO L413 NwaCegarLoop]: 15 mSDtfsCounter, 82 mSDsluCounter, 23 mSDsCounter, 0 mSdLazyCounter, 46 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 82 SdHoareTripleChecker+Valid, 38 SdHoareTripleChecker+Invalid, 46 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 46 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-12-14 07:19:09,563 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [82 Valid, 38 Invalid, 46 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 46 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-12-14 07:19:09,564 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 71 states. [2022-12-14 07:19:09,565 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 71 to 68. [2022-12-14 07:19:09,565 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 68 states, 60 states have (on average 1.2666666666666666) internal successors, (76), 67 states have internal predecessors, (76), 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) [2022-12-14 07:19:09,565 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 76 transitions. [2022-12-14 07:19:09,565 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 76 transitions. Word has length 19 [2022-12-14 07:19:09,565 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 07:19:09,565 INFO L495 AbstractCegarLoop]: Abstraction has 68 states and 76 transitions. [2022-12-14 07:19:09,566 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 2.8333333333333335) internal successors, (17), 6 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) [2022-12-14 07:19:09,566 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 76 transitions. [2022-12-14 07:19:09,566 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2022-12-14 07:19:09,566 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 07:19:09,566 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1] [2022-12-14 07:19:09,571 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_796726a8-e317-4db0-8bbd-479427385a6d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Ended with exit code 0 [2022-12-14 07:19:09,766 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_796726a8-e317-4db0-8bbd-479427385a6d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2022-12-14 07:19:09,767 INFO L420 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 8 more)] === [2022-12-14 07:19:09,767 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 07:19:09,767 INFO L85 PathProgramCache]: Analyzing trace with hash -335468570, now seen corresponding path program 3 times [2022-12-14 07:19:09,767 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 07:19:09,767 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [437079015] [2022-12-14 07:19:09,767 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 07:19:09,767 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 07:19:09,778 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 07:19:09,814 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 12 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-12-14 07:19:09,814 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 07:19:09,814 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [437079015] [2022-12-14 07:19:09,815 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [437079015] provided 1 perfect and 0 imperfect interpolant sequences [2022-12-14 07:19:09,815 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-12-14 07:19:09,815 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-12-14 07:19:09,815 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1536896813] [2022-12-14 07:19:09,815 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-12-14 07:19:09,815 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-12-14 07:19:09,815 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 07:19:09,816 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-12-14 07:19:09,816 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2022-12-14 07:19:09,816 INFO L87 Difference]: Start difference. First operand 68 states and 76 transitions. Second operand has 6 states, 6 states have (on average 2.8333333333333335) internal successors, (17), 5 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) [2022-12-14 07:19:09,853 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 07:19:09,853 INFO L93 Difference]: Finished difference Result 74 states and 79 transitions. [2022-12-14 07:19:09,853 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2022-12-14 07:19:09,854 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 2.8333333333333335) internal successors, (17), 5 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) Word has length 20 [2022-12-14 07:19:09,854 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 07:19:09,854 INFO L225 Difference]: With dead ends: 74 [2022-12-14 07:19:09,854 INFO L226 Difference]: Without dead ends: 74 [2022-12-14 07:19:09,855 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=30, Invalid=42, Unknown=0, NotChecked=0, Total=72 [2022-12-14 07:19:09,855 INFO L413 NwaCegarLoop]: 17 mSDtfsCounter, 125 mSDsluCounter, 20 mSDsCounter, 0 mSdLazyCounter, 35 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 125 SdHoareTripleChecker+Valid, 37 SdHoareTripleChecker+Invalid, 38 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 35 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-12-14 07:19:09,855 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [125 Valid, 37 Invalid, 38 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 35 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-12-14 07:19:09,855 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 74 states. [2022-12-14 07:19:09,856 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 74 to 60. [2022-12-14 07:19:09,856 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 60 states, 52 states have (on average 1.25) internal successors, (65), 59 states have internal predecessors, (65), 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) [2022-12-14 07:19:09,857 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 65 transitions. [2022-12-14 07:19:09,857 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 65 transitions. Word has length 20 [2022-12-14 07:19:09,857 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 07:19:09,857 INFO L495 AbstractCegarLoop]: Abstraction has 60 states and 65 transitions. [2022-12-14 07:19:09,857 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 2.8333333333333335) internal successors, (17), 5 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) [2022-12-14 07:19:09,857 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 65 transitions. [2022-12-14 07:19:09,858 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2022-12-14 07:19:09,858 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 07:19:09,858 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 07:19:09,858 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2022-12-14 07:19:09,858 INFO L420 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr9ASSERT_VIOLATIONMEMORY_LEAK === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 8 more)] === [2022-12-14 07:19:09,858 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 07:19:09,858 INFO L85 PathProgramCache]: Analyzing trace with hash 783605901, now seen corresponding path program 1 times [2022-12-14 07:19:09,859 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 07:19:09,859 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [247192996] [2022-12-14 07:19:09,859 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 07:19:09,859 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 07:19:09,868 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 07:19:09,908 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 2 proven. 5 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-12-14 07:19:09,908 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 07:19:09,908 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [247192996] [2022-12-14 07:19:09,909 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [247192996] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 07:19:09,909 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [384448869] [2022-12-14 07:19:09,909 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 07:19:09,909 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 07:19:09,909 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_796726a8-e317-4db0-8bbd-479427385a6d/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 07:19:09,910 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_796726a8-e317-4db0-8bbd-479427385a6d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 07:19:09,911 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_796726a8-e317-4db0-8bbd-479427385a6d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2022-12-14 07:19:09,977 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 07:19:09,977 INFO L263 TraceCheckSpWp]: Trace formula consists of 165 conjuncts, 7 conjunts are in the unsatisfiable core [2022-12-14 07:19:09,979 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 07:19:09,995 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 2 proven. 5 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-12-14 07:19:09,995 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 07:19:10,017 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 2 proven. 5 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-12-14 07:19:10,017 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [384448869] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 07:19:10,017 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [476514862] [2022-12-14 07:19:10,019 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2022-12-14 07:19:10,019 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 07:19:10,019 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 07:19:10,019 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 07:19:10,019 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 07:19:10,092 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 6 treesize of output 5 [2022-12-14 07:19:10,095 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 9 [2022-12-14 07:19:10,104 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 11 treesize of output 7 [2022-12-14 07:19:10,107 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 11 treesize of output 7 [2022-12-14 07:19:10,113 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 15 treesize of output 1 [2022-12-14 07:19:10,129 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-12-14 07:19:10,129 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 17 treesize of output 21 [2022-12-14 07:19:10,136 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 19 [2022-12-14 07:19:10,156 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 07:19:10,163 INFO L321 Elim1Store]: treesize reduction 17, result has 29.2 percent of original size [2022-12-14 07:19:10,164 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 127 treesize of output 126 [2022-12-14 07:19:10,169 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 07:19:10,176 INFO L321 Elim1Store]: treesize reduction 29, result has 27.5 percent of original size [2022-12-14 07:19:10,177 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 159 treesize of output 158 [2022-12-14 07:19:10,192 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 15 treesize of output 1 [2022-12-14 07:19:10,207 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:19:10,216 INFO L321 Elim1Store]: treesize reduction 39, result has 18.8 percent of original size [2022-12-14 07:19:10,217 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 167 treesize of output 168 [2022-12-14 07:19:10,244 INFO L321 Elim1Store]: treesize reduction 60, result has 31.0 percent of original size [2022-12-14 07:19:10,244 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 5 case distinctions, treesize of input 170 treesize of output 185 [2022-12-14 07:19:10,275 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 15 treesize of output 1 [2022-12-14 07:19:10,279 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 11 treesize of output 7 [2022-12-14 07:19:10,282 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 11 treesize of output 7 [2022-12-14 07:19:10,293 INFO L321 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2022-12-14 07:19:10,293 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 14 treesize of output 20 [2022-12-14 07:19:10,307 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-12-14 07:19:10,308 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 17 treesize of output 21 [2022-12-14 07:19:10,319 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 15 treesize of output 1 [2022-12-14 07:19:10,324 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 11 treesize of output 7 [2022-12-14 07:19:10,327 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 11 treesize of output 7 [2022-12-14 07:19:10,428 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-12-14 07:19:10,428 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 17 treesize of output 21 [2022-12-14 07:19:10,433 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 14 [2022-12-14 07:19:10,440 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 07:19:11,037 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2628#(and (<= 0 |ULTIMATE.start_main_~s~0#1.offset|) (<= 2 |ULTIMATE.start_main_~len~1#1|) (<= 0 |#NULL.base|) (= |ULTIMATE.start_sll_length_~head#1.base| 0) (<= |ULTIMATE.start_sll_length_#res#1| 2147483647) (<= 0 |ULTIMATE.start_sll_length_#in~head#1.offset|) (<= |ULTIMATE.start_sll_length_#in~head#1.offset| 0) (<= |ULTIMATE.start_sll_create_~head~0#1.offset| 0) (<= 0 |ULTIMATE.start_sll_create_~new_head~0#1.offset|) (<= 0 |ULTIMATE.start_sll_length_~len~0#1|) (<= |ULTIMATE.start_sll_create_~len#1| 0) (<= |ULTIMATE.start_sll_create_#res#1.offset| 0) (<= |#NULL.offset| 0) (<= |ULTIMATE.start_sll_create_~new_head~0#1.offset| 0) (<= |#NULL.base| 0) (= |ULTIMATE.start_sll_length_~head#1.offset| 0) (= |ULTIMATE.start_sll_length_~len~0#1| |ULTIMATE.start_sll_length_#res#1|) (<= 0 |ULTIMATE.start_sll_create_#res#1.offset|) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|) (<= 2 |ULTIMATE.start_sll_create_#in~len#1|) (<= |ULTIMATE.start_main_~s~0#1.offset| 0) (not (= |ULTIMATE.start_sll_length_#res#1| |ULTIMATE.start_main_~len~1#1|)) (<= 0 |ULTIMATE.start_sll_create_~head~0#1.offset|))' at error location [2022-12-14 07:19:11,037 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 07:19:11,037 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 07:19:11,037 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 7 [2022-12-14 07:19:11,037 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1479531959] [2022-12-14 07:19:11,037 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 07:19:11,037 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2022-12-14 07:19:11,037 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 07:19:11,037 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2022-12-14 07:19:11,038 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=66, Invalid=206, Unknown=0, NotChecked=0, Total=272 [2022-12-14 07:19:11,038 INFO L87 Difference]: Start difference. First operand 60 states and 65 transitions. Second operand has 8 states, 8 states have (on average 2.75) internal successors, (22), 7 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) [2022-12-14 07:19:11,109 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 07:19:11,109 INFO L93 Difference]: Finished difference Result 69 states and 73 transitions. [2022-12-14 07:19:11,109 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2022-12-14 07:19:11,110 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 2.75) internal successors, (22), 7 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) Word has length 20 [2022-12-14 07:19:11,110 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 07:19:11,110 INFO L225 Difference]: With dead ends: 69 [2022-12-14 07:19:11,110 INFO L226 Difference]: Without dead ends: 69 [2022-12-14 07:19:11,111 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 68 GetRequests, 44 SyntacticMatches, 5 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 115 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=96, Invalid=324, Unknown=0, NotChecked=0, Total=420 [2022-12-14 07:19:11,111 INFO L413 NwaCegarLoop]: 27 mSDtfsCounter, 59 mSDsluCounter, 68 mSDsCounter, 0 mSdLazyCounter, 87 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 59 SdHoareTripleChecker+Valid, 95 SdHoareTripleChecker+Invalid, 90 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 87 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-12-14 07:19:11,111 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [59 Valid, 95 Invalid, 90 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 87 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-12-14 07:19:11,112 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2022-12-14 07:19:11,113 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 55. [2022-12-14 07:19:11,113 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 55 states, 47 states have (on average 1.2553191489361701) internal successors, (59), 54 states have internal predecessors, (59), 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) [2022-12-14 07:19:11,114 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 59 transitions. [2022-12-14 07:19:11,114 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 59 transitions. Word has length 20 [2022-12-14 07:19:11,114 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 07:19:11,114 INFO L495 AbstractCegarLoop]: Abstraction has 55 states and 59 transitions. [2022-12-14 07:19:11,114 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 2.75) internal successors, (22), 7 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) [2022-12-14 07:19:11,114 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 59 transitions. [2022-12-14 07:19:11,114 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2022-12-14 07:19:11,114 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 07:19:11,114 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 07:19:11,118 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_796726a8-e317-4db0-8bbd-479427385a6d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Ended with exit code 0 [2022-12-14 07:19:11,314 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_796726a8-e317-4db0-8bbd-479427385a6d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2022-12-14 07:19:11,315 INFO L420 AbstractCegarLoop]: === Iteration 19 === Targeting ULTIMATE.startErr7ASSERT_VIOLATIONMEMORY_FREE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 8 more)] === [2022-12-14 07:19:11,315 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 07:19:11,315 INFO L85 PathProgramCache]: Analyzing trace with hash 843589779, now seen corresponding path program 1 times [2022-12-14 07:19:11,315 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 07:19:11,316 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1749996690] [2022-12-14 07:19:11,316 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 07:19:11,316 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 07:19:11,326 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 07:19:11,366 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2022-12-14 07:19:11,366 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 07:19:11,366 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1749996690] [2022-12-14 07:19:11,366 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1749996690] provided 1 perfect and 0 imperfect interpolant sequences [2022-12-14 07:19:11,366 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-12-14 07:19:11,367 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-12-14 07:19:11,367 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1043589565] [2022-12-14 07:19:11,367 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-12-14 07:19:11,367 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-12-14 07:19:11,367 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 07:19:11,367 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-12-14 07:19:11,368 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2022-12-14 07:19:11,368 INFO L87 Difference]: Start difference. First operand 55 states and 59 transitions. Second operand has 6 states, 5 states have (on average 3.8) internal successors, (19), 6 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) [2022-12-14 07:19:11,421 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 07:19:11,422 INFO L93 Difference]: Finished difference Result 56 states and 60 transitions. [2022-12-14 07:19:11,422 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-12-14 07:19:11,422 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 3.8) internal successors, (19), 6 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 21 [2022-12-14 07:19:11,422 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 07:19:11,422 INFO L225 Difference]: With dead ends: 56 [2022-12-14 07:19:11,422 INFO L226 Difference]: Without dead ends: 56 [2022-12-14 07:19:11,422 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=27, Invalid=45, Unknown=0, NotChecked=0, Total=72 [2022-12-14 07:19:11,423 INFO L413 NwaCegarLoop]: 14 mSDtfsCounter, 72 mSDsluCounter, 18 mSDsCounter, 0 mSdLazyCounter, 51 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 72 SdHoareTripleChecker+Valid, 32 SdHoareTripleChecker+Invalid, 52 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 51 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-12-14 07:19:11,423 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [72 Valid, 32 Invalid, 52 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 51 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-12-14 07:19:11,423 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2022-12-14 07:19:11,424 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 56. [2022-12-14 07:19:11,425 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 56 states, 48 states have (on average 1.25) internal successors, (60), 55 states have internal predecessors, (60), 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) [2022-12-14 07:19:11,425 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 60 transitions. [2022-12-14 07:19:11,425 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 60 transitions. Word has length 21 [2022-12-14 07:19:11,425 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 07:19:11,425 INFO L495 AbstractCegarLoop]: Abstraction has 56 states and 60 transitions. [2022-12-14 07:19:11,425 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 3.8) internal successors, (19), 6 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) [2022-12-14 07:19:11,425 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 60 transitions. [2022-12-14 07:19:11,426 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2022-12-14 07:19:11,426 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 07:19:11,426 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1] [2022-12-14 07:19:11,426 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2022-12-14 07:19:11,426 INFO L420 AbstractCegarLoop]: === Iteration 20 === Targeting ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 8 more)] === [2022-12-14 07:19:11,427 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 07:19:11,427 INFO L85 PathProgramCache]: Analyzing trace with hash -1430491510, now seen corresponding path program 1 times [2022-12-14 07:19:11,427 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 07:19:11,427 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1635846488] [2022-12-14 07:19:11,427 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 07:19:11,427 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 07:19:11,446 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 07:19:11,670 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 4 proven. 14 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-12-14 07:19:11,671 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 07:19:11,671 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1635846488] [2022-12-14 07:19:11,671 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1635846488] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 07:19:11,671 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1059760499] [2022-12-14 07:19:11,671 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 07:19:11,671 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 07:19:11,671 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_796726a8-e317-4db0-8bbd-479427385a6d/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 07:19:11,672 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_796726a8-e317-4db0-8bbd-479427385a6d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 07:19:11,673 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_796726a8-e317-4db0-8bbd-479427385a6d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2022-12-14 07:19:11,745 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 07:19:11,747 INFO L263 TraceCheckSpWp]: Trace formula consists of 193 conjuncts, 56 conjunts are in the unsatisfiable core [2022-12-14 07:19:11,749 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 07:19:11,751 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 [2022-12-14 07:19:11,765 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-12-14 07:19:11,766 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 17 treesize of output 21 [2022-12-14 07:19:11,793 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 11 treesize of output 7 [2022-12-14 07:19:11,817 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 [2022-12-14 07:19:11,839 INFO L321 Elim1Store]: treesize reduction 48, result has 36.0 percent of original size [2022-12-14 07:19:11,839 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 26 treesize of output 41 [2022-12-14 07:19:11,898 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 37 treesize of output 28 [2022-12-14 07:19:11,908 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 11 treesize of output 7 [2022-12-14 07:19:11,976 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 07:19:11,976 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 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 7 [2022-12-14 07:19:11,979 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 13 treesize of output 9 [2022-12-14 07:19:12,035 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 07:19:12,043 INFO L321 Elim1Store]: treesize reduction 17, result has 32.0 percent of original size [2022-12-14 07:19:12,043 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 5 new quantified variables, introduced 5 case distinctions, treesize of input 62 treesize of output 35 [2022-12-14 07:19:12,083 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 11 proven. 7 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-12-14 07:19:12,084 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 07:19:12,156 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 31 treesize of output 29 [2022-12-14 07:19:12,159 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 60 treesize of output 58 [2022-12-14 07:19:14,515 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 3 proven. 15 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-12-14 07:19:14,515 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1059760499] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 07:19:14,515 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [654098342] [2022-12-14 07:19:14,516 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-12-14 07:19:14,516 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 07:19:14,516 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 07:19:14,516 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 07:19:14,516 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 07:19:14,576 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 6 treesize of output 5 [2022-12-14 07:19:14,579 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 9 [2022-12-14 07:19:14,588 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 15 treesize of output 1 [2022-12-14 07:19:14,592 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 11 treesize of output 7 [2022-12-14 07:19:14,595 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 11 treesize of output 7 [2022-12-14 07:19:14,608 INFO L321 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2022-12-14 07:19:14,608 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 12 treesize of output 14 [2022-12-14 07:19:14,623 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-12-14 07:19:14,624 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 17 treesize of output 21 [2022-12-14 07:19:14,646 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 07:19:14,654 INFO L321 Elim1Store]: treesize reduction 17, result has 29.2 percent of original size [2022-12-14 07:19:14,655 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 127 treesize of output 126 [2022-12-14 07:19:14,661 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 07:19:14,669 INFO L321 Elim1Store]: treesize reduction 17, result has 29.2 percent of original size [2022-12-14 07:19:14,669 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 135 treesize of output 134 [2022-12-14 07:19:14,681 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 15 treesize of output 1 [2022-12-14 07:19:14,697 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:19:14,705 INFO L321 Elim1Store]: treesize reduction 39, result has 18.8 percent of original size [2022-12-14 07:19:14,705 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 159 treesize of output 160 [2022-12-14 07:19:14,729 INFO L321 Elim1Store]: treesize reduction 60, result has 31.0 percent of original size [2022-12-14 07:19:14,730 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 5 case distinctions, treesize of input 162 treesize of output 177 [2022-12-14 07:19:14,755 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 11 treesize of output 7 [2022-12-14 07:19:14,757 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 15 treesize of output 1 [2022-12-14 07:19:14,760 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 11 treesize of output 7 [2022-12-14 07:19:14,775 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-12-14 07:19:14,775 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 17 treesize of output 21 [2022-12-14 07:19:14,782 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 16 [2022-12-14 07:19:14,791 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 11 treesize of output 7 [2022-12-14 07:19:14,794 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 15 treesize of output 1 [2022-12-14 07:19:14,796 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 11 treesize of output 7 [2022-12-14 07:19:14,864 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-12-14 07:19:14,864 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 17 treesize of output 21 [2022-12-14 07:19:14,868 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 16 [2022-12-14 07:19:14,876 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 07:19:15,447 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3043#(and (<= 0 |ULTIMATE.start_main_~s~0#1.offset|) (<= 2 |ULTIMATE.start_main_~len~1#1|) (<= 1 |ULTIMATE.start_sll_length_~len~0#1|) (not (= (select |#valid| |ULTIMATE.start_sll_length_~head#1.base|) 1)) (<= 0 |ULTIMATE.start_sll_length_#in~head#1.offset|) (<= |ULTIMATE.start_sll_length_#in~head#1.offset| 0) (<= |ULTIMATE.start_sll_create_~head~0#1.offset| 0) (<= 0 |ULTIMATE.start_sll_create_~new_head~0#1.offset|) (<= |ULTIMATE.start_sll_create_~len#1| 0) (<= |ULTIMATE.start_sll_create_#res#1.offset| 0) (<= |ULTIMATE.start_sll_create_~new_head~0#1.offset| 0) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_sll_create_#res#1.offset|) (<= 0 |#StackHeapBarrier|) (<= 2 |ULTIMATE.start_sll_create_#in~len#1|) (<= |ULTIMATE.start_main_~s~0#1.offset| 0) (<= 0 |ULTIMATE.start_sll_create_~head~0#1.offset|) (= |#NULL.base| 0))' at error location [2022-12-14 07:19:15,447 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 07:19:15,447 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 07:19:15,447 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 10, 10] total 23 [2022-12-14 07:19:15,447 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [411077515] [2022-12-14 07:19:15,447 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 07:19:15,447 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2022-12-14 07:19:15,448 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 07:19:15,448 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2022-12-14 07:19:15,448 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=117, Invalid=874, Unknown=1, NotChecked=0, Total=992 [2022-12-14 07:19:15,448 INFO L87 Difference]: Start difference. First operand 56 states and 60 transitions. Second operand has 24 states, 23 states have (on average 2.0) internal successors, (46), 24 states have internal predecessors, (46), 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) [2022-12-14 07:19:18,767 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [1] [2022-12-14 07:19:20,886 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [1] [2022-12-14 07:19:20,954 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 07:19:20,954 INFO L93 Difference]: Finished difference Result 75 states and 80 transitions. [2022-12-14 07:19:20,955 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2022-12-14 07:19:20,955 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 23 states have (on average 2.0) internal successors, (46), 24 states have internal predecessors, (46), 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 22 [2022-12-14 07:19:20,955 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 07:19:20,956 INFO L225 Difference]: With dead ends: 75 [2022-12-14 07:19:20,956 INFO L226 Difference]: Without dead ends: 75 [2022-12-14 07:19:20,957 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 83 GetRequests, 44 SyntacticMatches, 0 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 336 ImplicationChecksByTransitivity, 4.0s TimeCoverageRelationStatistics Valid=272, Invalid=1367, Unknown=1, NotChecked=0, Total=1640 [2022-12-14 07:19:20,957 INFO L413 NwaCegarLoop]: 19 mSDtfsCounter, 195 mSDsluCounter, 174 mSDsCounter, 0 mSdLazyCounter, 359 mSolverCounterSat, 6 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 195 SdHoareTripleChecker+Valid, 193 SdHoareTripleChecker+Invalid, 367 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 359 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.5s IncrementalHoareTripleChecker+Time [2022-12-14 07:19:20,957 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [195 Valid, 193 Invalid, 367 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 359 Invalid, 2 Unknown, 0 Unchecked, 4.5s Time] [2022-12-14 07:19:20,958 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2022-12-14 07:19:20,959 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 58. [2022-12-14 07:19:20,960 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 58 states, 50 states have (on average 1.28) internal successors, (64), 57 states have internal predecessors, (64), 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) [2022-12-14 07:19:20,960 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 64 transitions. [2022-12-14 07:19:20,960 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 64 transitions. Word has length 22 [2022-12-14 07:19:20,960 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 07:19:20,960 INFO L495 AbstractCegarLoop]: Abstraction has 58 states and 64 transitions. [2022-12-14 07:19:20,960 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 23 states have (on average 2.0) internal successors, (46), 24 states have internal predecessors, (46), 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) [2022-12-14 07:19:20,960 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 64 transitions. [2022-12-14 07:19:20,961 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2022-12-14 07:19:20,961 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 07:19:20,961 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1] [2022-12-14 07:19:20,965 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_796726a8-e317-4db0-8bbd-479427385a6d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Ended with exit code 0 [2022-12-14 07:19:21,162 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_796726a8-e317-4db0-8bbd-479427385a6d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 07:19:21,163 INFO L420 AbstractCegarLoop]: === Iteration 21 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 8 more)] === [2022-12-14 07:19:21,164 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 07:19:21,164 INFO L85 PathProgramCache]: Analyzing trace with hash -1430491509, now seen corresponding path program 1 times [2022-12-14 07:19:21,164 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 07:19:21,165 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2048599961] [2022-12-14 07:19:21,165 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 07:19:21,166 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 07:19:21,211 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 07:19:21,580 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 3 proven. 15 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-12-14 07:19:21,580 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 07:19:21,580 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2048599961] [2022-12-14 07:19:21,580 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2048599961] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 07:19:21,580 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1410535757] [2022-12-14 07:19:21,580 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 07:19:21,580 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 07:19:21,580 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_796726a8-e317-4db0-8bbd-479427385a6d/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 07:19:21,581 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_796726a8-e317-4db0-8bbd-479427385a6d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 07:19:21,582 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_796726a8-e317-4db0-8bbd-479427385a6d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2022-12-14 07:19:21,645 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 07:19:21,646 INFO L263 TraceCheckSpWp]: Trace formula consists of 193 conjuncts, 65 conjunts are in the unsatisfiable core [2022-12-14 07:19:21,649 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 07:19:21,652 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 [2022-12-14 07:19:21,683 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-12-14 07:19:21,683 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 17 treesize of output 21 [2022-12-14 07:19:21,690 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 14 [2022-12-14 07:19:21,723 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 11 treesize of output 7 [2022-12-14 07:19:21,727 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 11 treesize of output 7 [2022-12-14 07:19:21,769 INFO L321 Elim1Store]: treesize reduction 19, result has 47.2 percent of original size [2022-12-14 07:19:21,769 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 16 treesize of output 26 [2022-12-14 07:19:21,791 INFO L321 Elim1Store]: treesize reduction 8, result has 61.9 percent of original size [2022-12-14 07:19:21,792 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 20 treesize of output 22 [2022-12-14 07:19:21,843 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 37 treesize of output 28 [2022-12-14 07:19:21,851 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:19:21,851 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 22 [2022-12-14 07:19:22,009 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 07:19:22,010 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 07:19:22,018 INFO L321 Elim1Store]: treesize reduction 17, result has 32.0 percent of original size [2022-12-14 07:19:22,018 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 5 new quantified variables, introduced 5 case distinctions, treesize of input 83 treesize of output 48 [2022-12-14 07:19:22,025 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 07:19:22,028 INFO L321 Elim1Store]: treesize reduction 5, result has 37.5 percent of original size [2022-12-14 07:19:22,028 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 3 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 1 case distinctions, treesize of input 26 treesize of output 16 [2022-12-14 07:19:22,061 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 5 proven. 13 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-12-14 07:19:22,061 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 07:19:22,541 INFO L321 Elim1Store]: treesize reduction 79, result has 22.5 percent of original size [2022-12-14 07:19:22,541 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 1158 treesize of output 948 [2022-12-14 07:19:22,559 INFO L321 Elim1Store]: treesize reduction 62, result has 11.4 percent of original size [2022-12-14 07:19:22,559 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 2480 treesize of output 1787 [2022-12-14 07:19:22,579 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-12-14 07:19:22,580 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 1776 treesize of output 1656 [2022-12-14 07:19:22,594 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-12-14 07:19:22,595 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 3 new quantified variables, introduced 1 case distinctions, treesize of input 1642 treesize of output 1526 [2022-12-14 07:19:22,621 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 6 treesize of output 4 [2022-12-14 07:19:22,633 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 11 treesize of output 4 [2022-12-14 07:19:22,872 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:19:22,874 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 28 treesize of output 21 [2022-12-14 07:19:22,881 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:19:22,883 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 18 treesize of output 16 [2022-12-14 07:19:22,934 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-12-14 07:19:22,934 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 1 new quantified variables, introduced 1 case distinctions, treesize of input 61 treesize of output 62 [2022-12-14 07:19:22,937 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:19:22,940 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:19:22,947 INFO L321 Elim1Store]: treesize reduction 33, result has 31.3 percent of original size [2022-12-14 07:19:22,947 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 202 treesize of output 154 [2022-12-14 07:19:22,956 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-12-14 07:19:22,957 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 158 treesize of output 154 [2022-12-14 07:19:22,966 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-12-14 07:19:22,966 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 140 treesize of output 132 [2022-12-14 07:19:22,982 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 6 treesize of output 4 [2022-12-14 07:19:22,991 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 11 treesize of output 4 [2022-12-14 07:19:22,998 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:19:23,000 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 49 treesize of output 47 [2022-12-14 07:19:23,010 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:19:23,012 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 18 treesize of output 16 [2022-12-14 07:19:25,510 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 103 treesize of output 99 [2022-12-14 07:19:25,636 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 3 proven. 15 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-12-14 07:19:25,636 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1410535757] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 07:19:25,637 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [103996922] [2022-12-14 07:19:25,637 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-12-14 07:19:25,638 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 07:19:25,638 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 07:19:25,638 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 07:19:25,638 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 07:19:25,698 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 6 treesize of output 5 [2022-12-14 07:19:25,702 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 9 [2022-12-14 07:19:25,712 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 15 treesize of output 1 [2022-12-14 07:19:25,716 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 11 treesize of output 7 [2022-12-14 07:19:25,720 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 11 treesize of output 7 [2022-12-14 07:19:25,739 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-12-14 07:19:25,739 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 17 treesize of output 21 [2022-12-14 07:19:25,745 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 19 [2022-12-14 07:19:25,767 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 15 treesize of output 1 [2022-12-14 07:19:25,774 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 07:19:25,782 INFO L321 Elim1Store]: treesize reduction 17, result has 29.2 percent of original size [2022-12-14 07:19:25,782 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 134 treesize of output 133 [2022-12-14 07:19:25,789 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 07:19:25,798 INFO L321 Elim1Store]: treesize reduction 21, result has 34.4 percent of original size [2022-12-14 07:19:25,798 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 154 treesize of output 153 [2022-12-14 07:19:25,820 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:19:25,831 INFO L321 Elim1Store]: treesize reduction 39, result has 18.8 percent of original size [2022-12-14 07:19:25,831 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 182 treesize of output 177 [2022-12-14 07:19:25,859 INFO L321 Elim1Store]: treesize reduction 60, result has 31.0 percent of original size [2022-12-14 07:19:25,859 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 5 case distinctions, treesize of input 185 treesize of output 200 [2022-12-14 07:19:25,886 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 11 treesize of output 7 [2022-12-14 07:19:25,889 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 15 treesize of output 1 [2022-12-14 07:19:25,892 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 11 treesize of output 7 [2022-12-14 07:19:25,910 INFO L321 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2022-12-14 07:19:25,910 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 14 treesize of output 20 [2022-12-14 07:19:25,925 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-12-14 07:19:25,925 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 17 treesize of output 21 [2022-12-14 07:19:25,936 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 11 treesize of output 7 [2022-12-14 07:19:25,939 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 11 treesize of output 7 [2022-12-14 07:19:25,942 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 15 treesize of output 1 [2022-12-14 07:19:26,009 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-12-14 07:19:26,009 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 17 treesize of output 21 [2022-12-14 07:19:26,015 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 16 [2022-12-14 07:19:26,026 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 07:19:26,799 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3356#(and (<= 0 |ULTIMATE.start_main_~s~0#1.offset|) (<= 2 |ULTIMATE.start_main_~len~1#1|) (<= 1 |ULTIMATE.start_sll_length_~len~0#1|) (<= 0 |ULTIMATE.start_sll_length_#in~head#1.offset|) (<= |ULTIMATE.start_sll_length_#in~head#1.offset| 0) (<= |ULTIMATE.start_sll_create_~head~0#1.offset| 0) (<= 0 |ULTIMATE.start_sll_create_~new_head~0#1.offset|) (<= |ULTIMATE.start_sll_create_~len#1| 0) (<= |ULTIMATE.start_sll_create_#res#1.offset| 0) (<= |ULTIMATE.start_sll_create_~new_head~0#1.offset| 0) (= |#NULL.offset| 0) (or (not (<= 0 |ULTIMATE.start_sll_length_~head#1.offset|)) (not (<= (+ |ULTIMATE.start_sll_length_~head#1.offset| 4) (select |#length| |ULTIMATE.start_sll_length_~head#1.base|)))) (<= 0 |ULTIMATE.start_sll_create_#res#1.offset|) (<= 0 |#StackHeapBarrier|) (<= 2 |ULTIMATE.start_sll_create_#in~len#1|) (<= |ULTIMATE.start_main_~s~0#1.offset| 0) (<= 0 |ULTIMATE.start_sll_create_~head~0#1.offset|) (= |#NULL.base| 0))' at error location [2022-12-14 07:19:26,799 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 07:19:26,799 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 07:19:26,799 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10] total 27 [2022-12-14 07:19:26,799 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [129805596] [2022-12-14 07:19:26,799 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 07:19:26,799 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 28 states [2022-12-14 07:19:26,800 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 07:19:26,800 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2022-12-14 07:19:26,800 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=112, Invalid=1148, Unknown=0, NotChecked=0, Total=1260 [2022-12-14 07:19:26,800 INFO L87 Difference]: Start difference. First operand 58 states and 64 transitions. Second operand has 28 states, 27 states have (on average 1.962962962962963) internal successors, (53), 28 states have internal predecessors, (53), 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) [2022-12-14 07:19:32,311 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [1] [2022-12-14 07:19:34,346 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [1] [2022-12-14 07:19:36,398 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [1] [2022-12-14 07:19:38,462 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [1] [2022-12-14 07:19:41,657 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [1] [2022-12-14 07:19:43,718 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [1] [2022-12-14 07:19:45,757 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [1] [2022-12-14 07:19:47,214 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.35s for a HTC check with result INVALID. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [1] [2022-12-14 07:19:49,234 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.02s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [1] [2022-12-14 07:19:51,263 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.03s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [1] [2022-12-14 07:19:53,315 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [1] [2022-12-14 07:19:55,383 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [1] [2022-12-14 07:20:06,430 WARN L233 SmtUtils]: Spent 6.55s on a formula simplification. DAG size of input: 116 DAG size of output: 100 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-12-14 07:20:08,450 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0, 1] [2022-12-14 07:20:10,544 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0, 1] [2022-12-14 07:20:12,622 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0, 1] [2022-12-14 07:20:14,973 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0, 1] [2022-12-14 07:20:17,049 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0, 1] [2022-12-14 07:20:19,197 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0, 1] [2022-12-14 07:20:21,217 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0, 1] [2022-12-14 07:20:23,287 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0, 1] [2022-12-14 07:20:32,551 WARN L233 SmtUtils]: Spent 5.01s on a formula simplification. DAG size of input: 104 DAG size of output: 88 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-12-14 07:20:34,555 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0, 1] [2022-12-14 07:20:36,600 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0, 1] [2022-12-14 07:20:38,616 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0, 1] [2022-12-14 07:20:40,650 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0, 1] [2022-12-14 07:20:42,657 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0, 1] [2022-12-14 07:20:43,496 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 07:20:43,496 INFO L93 Difference]: Finished difference Result 129 states and 134 transitions. [2022-12-14 07:20:43,497 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2022-12-14 07:20:43,497 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 27 states have (on average 1.962962962962963) internal successors, (53), 28 states have internal predecessors, (53), 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 22 [2022-12-14 07:20:43,497 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 07:20:43,497 INFO L225 Difference]: With dead ends: 129 [2022-12-14 07:20:43,497 INFO L226 Difference]: Without dead ends: 129 [2022-12-14 07:20:43,498 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 92 GetRequests, 39 SyntacticMatches, 1 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 541 ImplicationChecksByTransitivity, 27.8s TimeCoverageRelationStatistics Valid=442, Invalid=2416, Unknown=4, NotChecked=0, Total=2862 [2022-12-14 07:20:43,498 INFO L413 NwaCegarLoop]: 18 mSDtfsCounter, 522 mSDsluCounter, 237 mSDsCounter, 0 mSdLazyCounter, 518 mSolverCounterSat, 12 mSolverCounterUnsat, 24 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 52.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 522 SdHoareTripleChecker+Valid, 255 SdHoareTripleChecker+Invalid, 554 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 518 IncrementalHoareTripleChecker+Invalid, 24 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 52.7s IncrementalHoareTripleChecker+Time [2022-12-14 07:20:43,498 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [522 Valid, 255 Invalid, 554 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 518 Invalid, 24 Unknown, 0 Unchecked, 52.7s Time] [2022-12-14 07:20:43,499 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 129 states. [2022-12-14 07:20:43,499 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 129 to 58. [2022-12-14 07:20:43,499 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 58 states, 50 states have (on average 1.26) internal successors, (63), 57 states have internal predecessors, (63), 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) [2022-12-14 07:20:43,500 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 63 transitions. [2022-12-14 07:20:43,500 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 63 transitions. Word has length 22 [2022-12-14 07:20:43,500 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 07:20:43,500 INFO L495 AbstractCegarLoop]: Abstraction has 58 states and 63 transitions. [2022-12-14 07:20:43,500 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 28 states, 27 states have (on average 1.962962962962963) internal successors, (53), 28 states have internal predecessors, (53), 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) [2022-12-14 07:20:43,500 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 63 transitions. [2022-12-14 07:20:43,500 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2022-12-14 07:20:43,500 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 07:20:43,500 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 07:20:43,506 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_796726a8-e317-4db0-8bbd-479427385a6d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Ended with exit code 0 [2022-12-14 07:20:43,701 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20,11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_796726a8-e317-4db0-8bbd-479427385a6d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 07:20:43,702 INFO L420 AbstractCegarLoop]: === Iteration 22 === Targeting ULTIMATE.startErr9ASSERT_VIOLATIONMEMORY_LEAK === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 8 more)] === [2022-12-14 07:20:43,702 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 07:20:43,703 INFO L85 PathProgramCache]: Analyzing trace with hash -1395508635, now seen corresponding path program 2 times [2022-12-14 07:20:43,703 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 07:20:43,703 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [273573081] [2022-12-14 07:20:43,703 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 07:20:43,704 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 07:20:43,741 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 07:20:43,936 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 3 proven. 13 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-12-14 07:20:43,936 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 07:20:43,936 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [273573081] [2022-12-14 07:20:43,937 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [273573081] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 07:20:43,937 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1482776260] [2022-12-14 07:20:43,937 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 07:20:43,937 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 07:20:43,937 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_796726a8-e317-4db0-8bbd-479427385a6d/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 07:20:43,938 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_796726a8-e317-4db0-8bbd-479427385a6d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 07:20:43,939 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_796726a8-e317-4db0-8bbd-479427385a6d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2022-12-14 07:20:44,017 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2022-12-14 07:20:44,017 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 07:20:44,019 INFO L263 TraceCheckSpWp]: Trace formula consists of 201 conjuncts, 51 conjunts are in the unsatisfiable core [2022-12-14 07:20:44,022 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 07:20:44,058 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 11 treesize of output 7 [2022-12-14 07:20:44,098 INFO L321 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2022-12-14 07:20:44,098 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 11 treesize of output 11 [2022-12-14 07:20:44,147 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 19 [2022-12-14 07:20:44,152 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 11 treesize of output 7 [2022-12-14 07:20:44,276 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 07:20:44,276 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 1 new quantified variables, introduced 0 case distinctions, treesize of input 38 treesize of output 22 [2022-12-14 07:20:44,352 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 07:20:44,353 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 07:20:44,362 INFO L321 Elim1Store]: treesize reduction 37, result has 15.9 percent of original size [2022-12-14 07:20:44,363 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 6 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 24 [2022-12-14 07:20:44,366 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 3 proven. 13 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-12-14 07:20:44,366 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 07:20:44,473 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 30 treesize of output 28 [2022-12-14 07:20:44,478 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 58 treesize of output 56 [2022-12-14 07:20:44,666 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 07:20:44,704 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 3 proven. 13 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-12-14 07:20:44,705 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1482776260] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 07:20:44,705 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1737289644] [2022-12-14 07:20:44,706 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2022-12-14 07:20:44,706 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 07:20:44,707 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 07:20:44,707 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 07:20:44,707 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 07:20:44,779 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 6 treesize of output 5 [2022-12-14 07:20:44,784 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 9 [2022-12-14 07:20:44,796 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 11 treesize of output 7 [2022-12-14 07:20:44,802 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 11 treesize of output 7 [2022-12-14 07:20:44,808 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 15 treesize of output 1 [2022-12-14 07:20:44,828 INFO L321 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2022-12-14 07:20:44,829 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 19 treesize of output 19 [2022-12-14 07:20:44,853 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-12-14 07:20:44,853 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 17 treesize of output 21 [2022-12-14 07:20:44,874 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 15 treesize of output 1 [2022-12-14 07:20:44,882 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 07:20:44,894 INFO L321 Elim1Store]: treesize reduction 17, result has 29.2 percent of original size [2022-12-14 07:20:44,894 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 127 treesize of output 126 [2022-12-14 07:20:44,901 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 07:20:44,912 INFO L321 Elim1Store]: treesize reduction 29, result has 27.5 percent of original size [2022-12-14 07:20:44,912 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 159 treesize of output 158 [2022-12-14 07:20:44,938 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:20:44,950 INFO L321 Elim1Store]: treesize reduction 39, result has 18.8 percent of original size [2022-12-14 07:20:44,951 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 167 treesize of output 168 [2022-12-14 07:20:44,991 INFO L321 Elim1Store]: treesize reduction 60, result has 31.0 percent of original size [2022-12-14 07:20:44,991 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 5 case distinctions, treesize of input 170 treesize of output 185 [2022-12-14 07:20:45,031 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 11 treesize of output 7 [2022-12-14 07:20:45,035 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 11 treesize of output 7 [2022-12-14 07:20:45,040 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 15 treesize of output 1 [2022-12-14 07:20:45,060 INFO L321 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2022-12-14 07:20:45,060 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 14 treesize of output 20 [2022-12-14 07:20:45,081 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-12-14 07:20:45,082 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 17 treesize of output 21 [2022-12-14 07:20:45,094 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 11 treesize of output 7 [2022-12-14 07:20:45,098 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 15 treesize of output 1 [2022-12-14 07:20:45,103 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 11 treesize of output 7 [2022-12-14 07:20:45,178 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-12-14 07:20:45,179 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 17 treesize of output 21 [2022-12-14 07:20:45,185 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 14 [2022-12-14 07:20:45,193 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 07:20:46,192 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3740#(and (<= 0 |ULTIMATE.start_main_~s~0#1.offset|) (<= 2 |ULTIMATE.start_main_~len~1#1|) (= |ULTIMATE.start_sll_length_~head#1.base| 0) (<= |ULTIMATE.start_sll_length_#res#1| 2147483647) (<= 0 |ULTIMATE.start_sll_length_#in~head#1.offset|) (<= |ULTIMATE.start_sll_length_#in~head#1.offset| 0) (<= |ULTIMATE.start_sll_create_~head~0#1.offset| 0) (<= 0 |ULTIMATE.start_sll_create_~new_head~0#1.offset|) (<= 0 |ULTIMATE.start_sll_length_~len~0#1|) (<= |ULTIMATE.start_sll_create_~len#1| 0) (<= |ULTIMATE.start_sll_create_#res#1.offset| 0) (<= |ULTIMATE.start_sll_create_~new_head~0#1.offset| 0) (= |#NULL.offset| 0) (= |ULTIMATE.start_sll_length_~head#1.offset| 0) (= |ULTIMATE.start_sll_length_~len~0#1| |ULTIMATE.start_sll_length_#res#1|) (<= 0 |ULTIMATE.start_sll_create_#res#1.offset|) (<= 0 |#StackHeapBarrier|) (<= 2 |ULTIMATE.start_sll_create_#in~len#1|) (<= |ULTIMATE.start_main_~s~0#1.offset| 0) (not (= |ULTIMATE.start_sll_length_#res#1| |ULTIMATE.start_main_~len~1#1|)) (<= 0 |ULTIMATE.start_sll_create_~head~0#1.offset|) (= |#NULL.base| 0))' at error location [2022-12-14 07:20:46,192 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 07:20:46,192 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 07:20:46,192 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 11, 11] total 21 [2022-12-14 07:20:46,192 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1946709554] [2022-12-14 07:20:46,193 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 07:20:46,193 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 21 states [2022-12-14 07:20:46,193 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 07:20:46,193 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2022-12-14 07:20:46,194 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=86, Invalid=784, Unknown=0, NotChecked=0, Total=870 [2022-12-14 07:20:46,194 INFO L87 Difference]: Start difference. First operand 58 states and 63 transitions. Second operand has 21 states, 21 states have (on average 2.0) internal successors, (42), 21 states have internal predecessors, (42), 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) [2022-12-14 07:20:47,554 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 07:20:47,554 INFO L93 Difference]: Finished difference Result 99 states and 103 transitions. [2022-12-14 07:20:47,555 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2022-12-14 07:20:47,555 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 21 states have (on average 2.0) internal successors, (42), 21 states have internal predecessors, (42), 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 23 [2022-12-14 07:20:47,555 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 07:20:47,555 INFO L225 Difference]: With dead ends: 99 [2022-12-14 07:20:47,555 INFO L226 Difference]: Without dead ends: 99 [2022-12-14 07:20:47,556 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 92 GetRequests, 49 SyntacticMatches, 0 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 345 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=335, Invalid=1645, Unknown=0, NotChecked=0, Total=1980 [2022-12-14 07:20:47,556 INFO L413 NwaCegarLoop]: 22 mSDtfsCounter, 275 mSDsluCounter, 190 mSDsCounter, 0 mSdLazyCounter, 320 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 275 SdHoareTripleChecker+Valid, 212 SdHoareTripleChecker+Invalid, 328 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 320 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-12-14 07:20:47,556 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [275 Valid, 212 Invalid, 328 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 320 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-12-14 07:20:47,556 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 99 states. [2022-12-14 07:20:47,557 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 99 to 58. [2022-12-14 07:20:47,557 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 58 states, 50 states have (on average 1.24) internal successors, (62), 57 states have internal predecessors, (62), 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) [2022-12-14 07:20:47,557 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 62 transitions. [2022-12-14 07:20:47,557 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 62 transitions. Word has length 23 [2022-12-14 07:20:47,557 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 07:20:47,557 INFO L495 AbstractCegarLoop]: Abstraction has 58 states and 62 transitions. [2022-12-14 07:20:47,557 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 21 states, 21 states have (on average 2.0) internal successors, (42), 21 states have internal predecessors, (42), 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) [2022-12-14 07:20:47,558 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 62 transitions. [2022-12-14 07:20:47,558 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2022-12-14 07:20:47,558 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 07:20:47,558 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 07:20:47,562 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_796726a8-e317-4db0-8bbd-479427385a6d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Ended with exit code 0 [2022-12-14 07:20:47,758 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_796726a8-e317-4db0-8bbd-479427385a6d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable21 [2022-12-14 07:20:47,759 INFO L420 AbstractCegarLoop]: === Iteration 23 === Targeting ULTIMATE.startErr4REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 8 more)] === [2022-12-14 07:20:47,760 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 07:20:47,760 INFO L85 PathProgramCache]: Analyzing trace with hash 1529577129, now seen corresponding path program 1 times [2022-12-14 07:20:47,760 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 07:20:47,761 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [726331816] [2022-12-14 07:20:47,761 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 07:20:47,761 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 07:20:47,773 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 07:20:47,964 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 4 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 07:20:47,964 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 07:20:47,964 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [726331816] [2022-12-14 07:20:47,964 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [726331816] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 07:20:47,964 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1217906230] [2022-12-14 07:20:47,964 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 07:20:47,965 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 07:20:47,965 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_796726a8-e317-4db0-8bbd-479427385a6d/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 07:20:47,965 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_796726a8-e317-4db0-8bbd-479427385a6d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 07:20:47,966 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_796726a8-e317-4db0-8bbd-479427385a6d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2022-12-14 07:20:48,030 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 07:20:48,031 INFO L263 TraceCheckSpWp]: Trace formula consists of 190 conjuncts, 43 conjunts are in the unsatisfiable core [2022-12-14 07:20:48,033 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 07:20:48,035 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 [2022-12-14 07:20:48,053 INFO L321 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2022-12-14 07:20:48,054 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 11 treesize of output 11 [2022-12-14 07:20:48,057 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 6 treesize of output 5 [2022-12-14 07:20:48,082 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 11 treesize of output 7 [2022-12-14 07:20:48,127 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 13 treesize of output 9 [2022-12-14 07:20:48,256 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 07:20:48,267 INFO L321 Elim1Store]: treesize reduction 8, result has 60.0 percent of original size [2022-12-14 07:20:48,267 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 25 treesize of output 24 [2022-12-14 07:20:48,340 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 14 [2022-12-14 07:20:48,344 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 2 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 07:20:48,344 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 07:20:48,598 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-12-14 07:20:48,599 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 [2022-12-14 07:20:48,910 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 11 treesize of output 9 [2022-12-14 07:20:48,914 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 20 treesize of output 18 [2022-12-14 07:20:48,930 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 17 treesize of output 13 [2022-12-14 07:20:48,934 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:20:48,936 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 [2022-12-14 07:20:49,068 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 2 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 07:20:49,068 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1217906230] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 07:20:49,068 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1254773194] [2022-12-14 07:20:49,069 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2022-12-14 07:20:49,069 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 07:20:49,069 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 07:20:49,069 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 07:20:49,069 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 07:20:49,093 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:20:49,094 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:20:49,094 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 22 [2022-12-14 07:20:49,110 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 11 treesize of output 7 [2022-12-14 07:20:49,116 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:20:49,117 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:20:49,117 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 30 treesize of output 21 [2022-12-14 07:20:49,125 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 11 treesize of output 7 [2022-12-14 07:20:49,138 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:20:49,140 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:20:49,140 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:20:49,141 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:20:49,142 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:20:49,143 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 8 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 29 treesize of output 35 [2022-12-14 07:20:49,180 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 07:20:49,190 INFO L321 Elim1Store]: treesize reduction 21, result has 25.0 percent of original size [2022-12-14 07:20:49,190 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 252 treesize of output 235 [2022-12-14 07:20:49,199 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 07:20:49,208 INFO L321 Elim1Store]: treesize reduction 17, result has 29.2 percent of original size [2022-12-14 07:20:49,208 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 248 treesize of output 247 [2022-12-14 07:20:49,217 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 07:20:49,227 INFO L321 Elim1Store]: treesize reduction 21, result has 34.4 percent of original size [2022-12-14 07:20:49,228 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 268 treesize of output 267 [2022-12-14 07:20:49,272 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:20:49,326 INFO L321 Elim1Store]: treesize reduction 106, result has 15.9 percent of original size [2022-12-14 07:20:49,326 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 3 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 8 case distinctions, treesize of input 300 treesize of output 297 [2022-12-14 07:20:49,388 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 07:20:49,400 INFO L321 Elim1Store]: treesize reduction 17, result has 29.2 percent of original size [2022-12-14 07:20:49,400 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 248 treesize of output 247 [2022-12-14 07:20:49,409 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 07:20:49,420 INFO L321 Elim1Store]: treesize reduction 21, result has 34.4 percent of original size [2022-12-14 07:20:49,421 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 268 treesize of output 267 [2022-12-14 07:20:49,429 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 07:20:49,441 INFO L321 Elim1Store]: treesize reduction 21, result has 25.0 percent of original size [2022-12-14 07:20:49,442 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 312 treesize of output 295 [2022-12-14 07:20:49,548 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 9 [2022-12-14 07:20:49,633 INFO L321 Elim1Store]: treesize reduction 10, result has 64.3 percent of original size [2022-12-14 07:20:49,634 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 181 treesize of output 189 [2022-12-14 07:20:49,775 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 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 13 [2022-12-14 07:20:49,876 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 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 13 [2022-12-14 07:20:49,945 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:20:49,997 INFO L321 Elim1Store]: treesize reduction 106, result has 15.9 percent of original size [2022-12-14 07:20:49,997 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 3 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 8 case distinctions, treesize of input 300 treesize of output 297 [2022-12-14 07:20:50,027 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 07:20:52,488 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4102#(and (<= 0 |ULTIMATE.start_main_~s~0#1.offset|) (<= 2 |ULTIMATE.start_sll_length_#res#1|) (= |ULTIMATE.start_sll_length_~head#1.base| 0) (<= |ULTIMATE.start_sll_length_~len~0#1| 2) (<= |ULTIMATE.start_sll_destroy_#in~head#1.offset| 0) (<= 0 |ULTIMATE.start_sll_length_#in~head#1.offset|) (<= |ULTIMATE.start_sll_length_#in~head#1.offset| 0) (<= |ULTIMATE.start_sll_create_~head~0#1.offset| 0) (<= |ULTIMATE.start_sll_create_~len#1| 0) (<= |ULTIMATE.start_sll_create_#res#1.offset| 0) (<= 2 |ULTIMATE.start_sll_length_~len~0#1|) (not (= (select |#valid| |ULTIMATE.start_sll_destroy_~head#1.base|) 1)) (<= 0 |ULTIMATE.start_sll_destroy_#in~head#1.offset|) (<= |ULTIMATE.start_sll_create_#in~len#1| 2) (<= 0 |ULTIMATE.start_sll_create_~len#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start_sll_length_~head#1.offset| 0) (<= 0 |ULTIMATE.start_sll_create_#res#1.offset|) (<= |ULTIMATE.start_sll_length_#res#1| 2) (= |ULTIMATE.start_main_~len~1#1| 2) (<= 0 |#StackHeapBarrier|) (<= 2 |ULTIMATE.start_sll_create_#in~len#1|) (<= |ULTIMATE.start_main_~s~0#1.offset| 0) (<= 0 |ULTIMATE.start_sll_create_~head~0#1.offset|) (= |#NULL.base| 0))' at error location [2022-12-14 07:20:52,488 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 07:20:52,488 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 07:20:52,488 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 12, 12] total 27 [2022-12-14 07:20:52,489 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1411285027] [2022-12-14 07:20:52,489 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 07:20:52,489 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 28 states [2022-12-14 07:20:52,489 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 07:20:52,490 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2022-12-14 07:20:52,490 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=129, Invalid=1593, Unknown=0, NotChecked=0, Total=1722 [2022-12-14 07:20:52,491 INFO L87 Difference]: Start difference. First operand 58 states and 62 transitions. Second operand has 28 states, 27 states have (on average 2.074074074074074) internal successors, (56), 28 states have internal predecessors, (56), 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) [2022-12-14 07:20:53,627 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 07:20:53,627 INFO L93 Difference]: Finished difference Result 64 states and 68 transitions. [2022-12-14 07:20:53,628 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2022-12-14 07:20:53,628 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 27 states have (on average 2.074074074074074) internal successors, (56), 28 states have internal predecessors, (56), 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 24 [2022-12-14 07:20:53,628 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 07:20:53,628 INFO L225 Difference]: With dead ends: 64 [2022-12-14 07:20:53,628 INFO L226 Difference]: Without dead ends: 64 [2022-12-14 07:20:53,629 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 91 GetRequests, 39 SyntacticMatches, 1 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 3 DeprecatedPredicates, 492 ImplicationChecksByTransitivity, 3.9s TimeCoverageRelationStatistics Valid=273, Invalid=2483, Unknown=0, NotChecked=0, Total=2756 [2022-12-14 07:20:53,630 INFO L413 NwaCegarLoop]: 9 mSDtfsCounter, 165 mSDsluCounter, 107 mSDsCounter, 0 mSdLazyCounter, 472 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 165 SdHoareTripleChecker+Valid, 116 SdHoareTripleChecker+Invalid, 476 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 472 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-12-14 07:20:53,630 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [165 Valid, 116 Invalid, 476 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 472 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-12-14 07:20:53,630 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2022-12-14 07:20:53,631 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 61. [2022-12-14 07:20:53,631 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 61 states, 53 states have (on average 1.2641509433962264) internal successors, (67), 60 states have internal predecessors, (67), 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) [2022-12-14 07:20:53,632 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 67 transitions. [2022-12-14 07:20:53,632 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 67 transitions. Word has length 24 [2022-12-14 07:20:53,632 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 07:20:53,632 INFO L495 AbstractCegarLoop]: Abstraction has 61 states and 67 transitions. [2022-12-14 07:20:53,632 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 28 states, 27 states have (on average 2.074074074074074) internal successors, (56), 28 states have internal predecessors, (56), 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) [2022-12-14 07:20:53,632 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 67 transitions. [2022-12-14 07:20:53,633 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2022-12-14 07:20:53,633 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 07:20:53,633 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 07:20:53,637 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_796726a8-e317-4db0-8bbd-479427385a6d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Ended with exit code 0 [2022-12-14 07:20:53,833 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_796726a8-e317-4db0-8bbd-479427385a6d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable22 [2022-12-14 07:20:53,834 INFO L420 AbstractCegarLoop]: === Iteration 24 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 8 more)] === [2022-12-14 07:20:53,835 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 07:20:53,836 INFO L85 PathProgramCache]: Analyzing trace with hash 1529577130, now seen corresponding path program 1 times [2022-12-14 07:20:53,836 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 07:20:53,836 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [865723912] [2022-12-14 07:20:53,837 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 07:20:53,837 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 07:20:53,874 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 07:20:54,111 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 2 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 07:20:54,112 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 07:20:54,112 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [865723912] [2022-12-14 07:20:54,112 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [865723912] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 07:20:54,112 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1710083206] [2022-12-14 07:20:54,112 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 07:20:54,112 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 07:20:54,112 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_796726a8-e317-4db0-8bbd-479427385a6d/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 07:20:54,113 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_796726a8-e317-4db0-8bbd-479427385a6d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 07:20:54,113 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_796726a8-e317-4db0-8bbd-479427385a6d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2022-12-14 07:20:54,171 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 07:20:54,172 INFO L263 TraceCheckSpWp]: Trace formula consists of 190 conjuncts, 49 conjunts are in the unsatisfiable core [2022-12-14 07:20:54,174 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 07:20:54,200 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 11 treesize of output 7 [2022-12-14 07:20:54,306 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-12-14 07:20:54,307 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 15 treesize of output 15 [2022-12-14 07:20:54,313 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-12-14 07:20:54,313 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 17 treesize of output 17 [2022-12-14 07:20:54,382 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 5 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 07:20:54,382 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 07:20:54,683 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-12-14 07:20:54,683 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 47 treesize of output 51 [2022-12-14 07:20:54,799 INFO L321 Elim1Store]: treesize reduction 4, result has 63.6 percent of original size [2022-12-14 07:20:54,799 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 11 treesize of output 11 [2022-12-14 07:20:54,831 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 5 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 07:20:54,831 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1710083206] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 07:20:54,831 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1474464008] [2022-12-14 07:20:54,833 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2022-12-14 07:20:54,833 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 07:20:54,833 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 07:20:54,833 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 07:20:54,833 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 07:20:54,860 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:20:54,861 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:20:54,861 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 22 [2022-12-14 07:20:54,878 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:20:54,879 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:20:54,880 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 30 treesize of output 21 [2022-12-14 07:20:54,885 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 11 treesize of output 7 [2022-12-14 07:20:54,891 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 11 treesize of output 7 [2022-12-14 07:20:54,907 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:20:54,908 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:20:54,910 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:20:54,911 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:20:54,912 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:20:54,913 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 8 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 22 treesize of output 30 [2022-12-14 07:20:54,952 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 07:20:54,965 INFO L321 Elim1Store]: treesize reduction 21, result has 25.0 percent of original size [2022-12-14 07:20:54,965 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 245 treesize of output 228 [2022-12-14 07:20:54,975 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 07:20:54,987 INFO L321 Elim1Store]: treesize reduction 17, result has 29.2 percent of original size [2022-12-14 07:20:54,988 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 241 treesize of output 240 [2022-12-14 07:20:54,997 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 07:20:55,012 INFO L321 Elim1Store]: treesize reduction 17, result has 29.2 percent of original size [2022-12-14 07:20:55,012 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 249 treesize of output 248 [2022-12-14 07:20:55,051 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:20:55,106 INFO L321 Elim1Store]: treesize reduction 106, result has 15.9 percent of original size [2022-12-14 07:20:55,107 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 3 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 8 case distinctions, treesize of input 277 treesize of output 280 [2022-12-14 07:20:55,167 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 07:20:55,179 INFO L321 Elim1Store]: treesize reduction 21, result has 25.0 percent of original size [2022-12-14 07:20:55,180 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 245 treesize of output 228 [2022-12-14 07:20:55,188 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 07:20:55,197 INFO L321 Elim1Store]: treesize reduction 17, result has 29.2 percent of original size [2022-12-14 07:20:55,197 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 241 treesize of output 240 [2022-12-14 07:20:55,207 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 07:20:55,217 INFO L321 Elim1Store]: treesize reduction 29, result has 27.5 percent of original size [2022-12-14 07:20:55,217 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 277 treesize of output 276 [2022-12-14 07:20:55,311 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 9 [2022-12-14 07:20:55,390 INFO L321 Elim1Store]: treesize reduction 10, result has 64.3 percent of original size [2022-12-14 07:20:55,390 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 181 treesize of output 189 [2022-12-14 07:20:55,514 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 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 13 [2022-12-14 07:20:55,599 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 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 13 [2022-12-14 07:20:55,660 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:20:55,706 INFO L321 Elim1Store]: treesize reduction 106, result has 15.9 percent of original size [2022-12-14 07:20:55,707 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 3 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 8 case distinctions, treesize of input 277 treesize of output 280 [2022-12-14 07:20:55,738 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 07:20:57,523 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4424#(and (<= 0 |ULTIMATE.start_main_~s~0#1.offset|) (<= 2 |ULTIMATE.start_sll_length_#res#1|) (= |ULTIMATE.start_sll_length_~head#1.base| 0) (<= |ULTIMATE.start_sll_length_~len~0#1| 2) (<= |ULTIMATE.start_sll_destroy_#in~head#1.offset| 0) (<= 0 |ULTIMATE.start_sll_length_#in~head#1.offset|) (or (not (<= (+ |ULTIMATE.start_sll_destroy_~head#1.offset| 4) (select |#length| |ULTIMATE.start_sll_destroy_~head#1.base|))) (not (<= 0 |ULTIMATE.start_sll_destroy_~head#1.offset|))) (<= |ULTIMATE.start_sll_length_#in~head#1.offset| 0) (<= |ULTIMATE.start_sll_create_~head~0#1.offset| 0) (<= |ULTIMATE.start_sll_create_~len#1| 0) (<= |ULTIMATE.start_sll_create_#res#1.offset| 0) (<= 2 |ULTIMATE.start_sll_length_~len~0#1|) (<= 0 |ULTIMATE.start_sll_destroy_#in~head#1.offset|) (<= |ULTIMATE.start_sll_create_#in~len#1| 2) (<= 0 |ULTIMATE.start_sll_create_~len#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start_sll_length_~head#1.offset| 0) (or (not (= |ULTIMATE.start_sll_destroy_~head#1.base| 0)) (not (= |ULTIMATE.start_sll_destroy_~head#1.offset| 0))) (<= 0 |ULTIMATE.start_sll_create_#res#1.offset|) (<= |ULTIMATE.start_sll_length_#res#1| 2) (= |ULTIMATE.start_main_~len~1#1| 2) (<= 0 |#StackHeapBarrier|) (<= 2 |ULTIMATE.start_sll_create_#in~len#1|) (<= |ULTIMATE.start_main_~s~0#1.offset| 0) (<= 0 |ULTIMATE.start_sll_create_~head~0#1.offset|) (= |#NULL.base| 0))' at error location [2022-12-14 07:20:57,524 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 07:20:57,524 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 07:20:57,524 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 12, 12] total 22 [2022-12-14 07:20:57,524 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1979248811] [2022-12-14 07:20:57,524 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 07:20:57,524 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2022-12-14 07:20:57,524 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 07:20:57,524 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2022-12-14 07:20:57,525 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=128, Invalid=1204, Unknown=0, NotChecked=0, Total=1332 [2022-12-14 07:20:57,525 INFO L87 Difference]: Start difference. First operand 61 states and 67 transitions. Second operand has 23 states, 22 states have (on average 2.1363636363636362) internal successors, (47), 23 states have internal predecessors, (47), 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) [2022-12-14 07:20:58,248 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 07:20:58,248 INFO L93 Difference]: Finished difference Result 64 states and 68 transitions. [2022-12-14 07:20:58,248 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2022-12-14 07:20:58,248 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 22 states have (on average 2.1363636363636362) internal successors, (47), 23 states have internal predecessors, (47), 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 24 [2022-12-14 07:20:58,248 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 07:20:58,249 INFO L225 Difference]: With dead ends: 64 [2022-12-14 07:20:58,249 INFO L226 Difference]: Without dead ends: 64 [2022-12-14 07:20:58,250 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 91 GetRequests, 43 SyntacticMatches, 2 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 341 ImplicationChecksByTransitivity, 2.8s TimeCoverageRelationStatistics Valid=296, Invalid=1960, Unknown=0, NotChecked=0, Total=2256 [2022-12-14 07:20:58,250 INFO L413 NwaCegarLoop]: 11 mSDtfsCounter, 224 mSDsluCounter, 110 mSDsCounter, 0 mSdLazyCounter, 355 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 224 SdHoareTripleChecker+Valid, 121 SdHoareTripleChecker+Invalid, 365 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 355 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-12-14 07:20:58,250 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [224 Valid, 121 Invalid, 365 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 355 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-12-14 07:20:58,250 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2022-12-14 07:20:58,251 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 62. [2022-12-14 07:20:58,251 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 62 states, 54 states have (on average 1.2407407407407407) internal successors, (67), 61 states have internal predecessors, (67), 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) [2022-12-14 07:20:58,251 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 67 transitions. [2022-12-14 07:20:58,251 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 67 transitions. Word has length 24 [2022-12-14 07:20:58,251 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 07:20:58,251 INFO L495 AbstractCegarLoop]: Abstraction has 62 states and 67 transitions. [2022-12-14 07:20:58,251 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 22 states have (on average 2.1363636363636362) internal successors, (47), 23 states have internal predecessors, (47), 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) [2022-12-14 07:20:58,251 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 67 transitions. [2022-12-14 07:20:58,252 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2022-12-14 07:20:58,252 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 07:20:58,252 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 07:20:58,256 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_796726a8-e317-4db0-8bbd-479427385a6d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2022-12-14 07:20:58,452 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23,14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_796726a8-e317-4db0-8bbd-479427385a6d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 07:20:58,454 INFO L420 AbstractCegarLoop]: === Iteration 25 === Targeting ULTIMATE.startErr10ASSERT_VIOLATIONMEMORY_LEAK === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 8 more)] === [2022-12-14 07:20:58,454 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 07:20:58,454 INFO L85 PathProgramCache]: Analyzing trace with hash 1529578231, now seen corresponding path program 1 times [2022-12-14 07:20:58,455 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 07:20:58,455 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1811488972] [2022-12-14 07:20:58,455 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 07:20:58,456 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 07:20:58,466 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 07:20:58,601 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 2 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 07:20:58,601 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 07:20:58,602 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1811488972] [2022-12-14 07:20:58,602 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1811488972] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 07:20:58,602 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1543999049] [2022-12-14 07:20:58,602 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 07:20:58,602 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 07:20:58,602 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_796726a8-e317-4db0-8bbd-479427385a6d/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 07:20:58,603 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_796726a8-e317-4db0-8bbd-479427385a6d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 07:20:58,603 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_796726a8-e317-4db0-8bbd-479427385a6d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2022-12-14 07:20:58,668 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 07:20:58,669 INFO L263 TraceCheckSpWp]: Trace formula consists of 195 conjuncts, 31 conjunts are in the unsatisfiable core [2022-12-14 07:20:58,670 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 07:20:58,709 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 11 treesize of output 7 [2022-12-14 07:20:58,756 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-12-14 07:20:58,756 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 16 treesize of output 16 [2022-12-14 07:20:58,782 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-12-14 07:20:58,782 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 07:20:58,841 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 11 treesize of output 9 [2022-12-14 07:20:58,842 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 20 treesize of output 18 [2022-12-14 07:20:58,849 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-12-14 07:20:58,850 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1543999049] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 07:20:58,850 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [320032464] [2022-12-14 07:20:58,851 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2022-12-14 07:20:58,851 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 07:20:58,851 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 07:20:58,851 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 07:20:58,851 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 07:20:58,881 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:20:58,881 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:20:58,882 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 22 [2022-12-14 07:20:58,895 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 11 treesize of output 7 [2022-12-14 07:20:58,901 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:20:58,902 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:20:58,902 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 30 treesize of output 21 [2022-12-14 07:20:58,909 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 11 treesize of output 7 [2022-12-14 07:20:58,925 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:20:58,926 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:20:58,927 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:20:58,931 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:20:58,932 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:20:58,933 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 8 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 29 treesize of output 35 [2022-12-14 07:20:58,977 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 07:20:58,991 INFO L321 Elim1Store]: treesize reduction 21, result has 25.0 percent of original size [2022-12-14 07:20:58,991 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 252 treesize of output 235 [2022-12-14 07:20:59,000 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 07:20:59,013 INFO L321 Elim1Store]: treesize reduction 17, result has 29.2 percent of original size [2022-12-14 07:20:59,013 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 248 treesize of output 247 [2022-12-14 07:20:59,025 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 07:20:59,036 INFO L321 Elim1Store]: treesize reduction 21, result has 34.4 percent of original size [2022-12-14 07:20:59,036 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 268 treesize of output 267 [2022-12-14 07:20:59,095 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:20:59,140 INFO L321 Elim1Store]: treesize reduction 106, result has 15.9 percent of original size [2022-12-14 07:20:59,140 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 3 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 8 case distinctions, treesize of input 300 treesize of output 297 [2022-12-14 07:20:59,240 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 07:20:59,255 INFO L321 Elim1Store]: treesize reduction 21, result has 25.0 percent of original size [2022-12-14 07:20:59,255 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 252 treesize of output 235 [2022-12-14 07:20:59,264 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 07:20:59,275 INFO L321 Elim1Store]: treesize reduction 17, result has 29.2 percent of original size [2022-12-14 07:20:59,276 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 248 treesize of output 247 [2022-12-14 07:20:59,286 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 07:20:59,300 INFO L321 Elim1Store]: treesize reduction 29, result has 27.5 percent of original size [2022-12-14 07:20:59,300 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 288 treesize of output 287 [2022-12-14 07:20:59,403 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 9 [2022-12-14 07:20:59,489 INFO L321 Elim1Store]: treesize reduction 10, result has 64.3 percent of original size [2022-12-14 07:20:59,489 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 179 treesize of output 187 [2022-12-14 07:20:59,603 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 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 13 [2022-12-14 07:20:59,686 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 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 13 [2022-12-14 07:20:59,756 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:20:59,803 INFO L321 Elim1Store]: treesize reduction 106, result has 15.9 percent of original size [2022-12-14 07:20:59,803 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 3 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 8 case distinctions, treesize of input 300 treesize of output 297 [2022-12-14 07:20:59,830 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 07:21:02,025 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4743#(and (<= 0 |ULTIMATE.start_main_~s~0#1.offset|) (<= 2 |ULTIMATE.start_sll_length_#res#1|) (= |ULTIMATE.start_sll_length_~head#1.base| 0) (<= |ULTIMATE.start_sll_length_~len~0#1| 2) (<= |ULTIMATE.start_sll_destroy_#in~head#1.offset| 0) (<= 0 |ULTIMATE.start_sll_length_#in~head#1.offset|) (<= |ULTIMATE.start_sll_length_#in~head#1.offset| 0) (<= |ULTIMATE.start_sll_create_~head~0#1.offset| 0) (not (= |ULTIMATE.start_main_old_#valid#1| |#valid|)) (<= |ULTIMATE.start_sll_create_~len#1| 0) (<= |ULTIMATE.start_sll_create_#res#1.offset| 0) (<= 2 |ULTIMATE.start_sll_length_~len~0#1|) (<= 0 |ULTIMATE.start_sll_destroy_#in~head#1.offset|) (<= |ULTIMATE.start_sll_create_#in~len#1| 2) (<= 0 |ULTIMATE.start_sll_create_~len#1|) (= |ULTIMATE.start_sll_destroy_~head#1.base| 0) (= |#NULL.offset| 0) (= |ULTIMATE.start_sll_length_~head#1.offset| 0) (<= 0 |ULTIMATE.start_sll_create_#res#1.offset|) (<= |ULTIMATE.start_sll_length_#res#1| 2) (= |ULTIMATE.start_main_~len~1#1| 2) (<= 0 |#StackHeapBarrier|) (<= 2 |ULTIMATE.start_sll_create_#in~len#1|) (<= |ULTIMATE.start_main_~s~0#1.offset| 0) (<= 0 |ULTIMATE.start_sll_create_~head~0#1.offset|) (= |ULTIMATE.start_sll_destroy_~head#1.offset| 0) (= |ULTIMATE.start_main_#res#1| 0) (= |#NULL.base| 0))' at error location [2022-12-14 07:21:02,025 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 07:21:02,025 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 07:21:02,025 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 19 [2022-12-14 07:21:02,025 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [443649825] [2022-12-14 07:21:02,026 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 07:21:02,027 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2022-12-14 07:21:02,027 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 07:21:02,028 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2022-12-14 07:21:02,028 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=119, Invalid=1003, Unknown=0, NotChecked=0, Total=1122 [2022-12-14 07:21:02,028 INFO L87 Difference]: Start difference. First operand 62 states and 67 transitions. Second operand has 19 states, 19 states have (on average 2.1052631578947367) internal successors, (40), 19 states have internal predecessors, (40), 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) [2022-12-14 07:21:02,335 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 07:21:02,335 INFO L93 Difference]: Finished difference Result 65 states and 69 transitions. [2022-12-14 07:21:02,335 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2022-12-14 07:21:02,335 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 2.1052631578947367) internal successors, (40), 19 states have internal predecessors, (40), 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 24 [2022-12-14 07:21:02,336 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 07:21:02,336 INFO L225 Difference]: With dead ends: 65 [2022-12-14 07:21:02,336 INFO L226 Difference]: Without dead ends: 65 [2022-12-14 07:21:02,336 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 91 GetRequests, 48 SyntacticMatches, 1 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 225 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=264, Invalid=1628, Unknown=0, NotChecked=0, Total=1892 [2022-12-14 07:21:02,337 INFO L413 NwaCegarLoop]: 15 mSDtfsCounter, 253 mSDsluCounter, 104 mSDsCounter, 0 mSdLazyCounter, 219 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 253 SdHoareTripleChecker+Valid, 119 SdHoareTripleChecker+Invalid, 223 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 219 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 07:21:02,337 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [253 Valid, 119 Invalid, 223 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 219 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 07:21:02,337 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2022-12-14 07:21:02,338 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 62. [2022-12-14 07:21:02,338 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 62 states, 54 states have (on average 1.2222222222222223) internal successors, (66), 61 states have internal predecessors, (66), 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) [2022-12-14 07:21:02,338 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 66 transitions. [2022-12-14 07:21:02,338 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 66 transitions. Word has length 24 [2022-12-14 07:21:02,338 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 07:21:02,338 INFO L495 AbstractCegarLoop]: Abstraction has 62 states and 66 transitions. [2022-12-14 07:21:02,338 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 19 states have (on average 2.1052631578947367) internal successors, (40), 19 states have internal predecessors, (40), 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) [2022-12-14 07:21:02,338 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 66 transitions. [2022-12-14 07:21:02,338 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2022-12-14 07:21:02,339 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 07:21:02,339 INFO L195 NwaCegarLoop]: trace histogram [4, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1] [2022-12-14 07:21:02,343 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_796726a8-e317-4db0-8bbd-479427385a6d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2022-12-14 07:21:02,539 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24,15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_796726a8-e317-4db0-8bbd-479427385a6d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 07:21:02,540 INFO L420 AbstractCegarLoop]: === Iteration 26 === Targeting ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 8 more)] === [2022-12-14 07:21:02,541 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 07:21:02,541 INFO L85 PathProgramCache]: Analyzing trace with hash -312757475, now seen corresponding path program 2 times [2022-12-14 07:21:02,541 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 07:21:02,541 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1275381947] [2022-12-14 07:21:02,541 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 07:21:02,541 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 07:21:02,560 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 07:21:03,012 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 24 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-12-14 07:21:03,013 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 07:21:03,013 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1275381947] [2022-12-14 07:21:03,013 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1275381947] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 07:21:03,013 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [723623491] [2022-12-14 07:21:03,013 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 07:21:03,013 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 07:21:03,013 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_796726a8-e317-4db0-8bbd-479427385a6d/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 07:21:03,014 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_796726a8-e317-4db0-8bbd-479427385a6d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 07:21:03,014 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_796726a8-e317-4db0-8bbd-479427385a6d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2022-12-14 07:21:03,082 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2022-12-14 07:21:03,083 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 07:21:03,084 INFO L263 TraceCheckSpWp]: Trace formula consists of 204 conjuncts, 82 conjunts are in the unsatisfiable core [2022-12-14 07:21:03,087 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 07:21:03,093 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 [2022-12-14 07:21:03,125 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 11 treesize of output 7 [2022-12-14 07:21:03,131 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 11 treesize of output 7 [2022-12-14 07:21:03,151 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-12-14 07:21:03,151 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 17 treesize of output 21 [2022-12-14 07:21:03,202 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 18 [2022-12-14 07:21:03,210 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 22 [2022-12-14 07:21:03,264 INFO L321 Elim1Store]: treesize reduction 4, result has 66.7 percent of original size [2022-12-14 07:21:03,265 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 15 treesize of output 15 [2022-12-14 07:21:03,334 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 07:21:03,341 INFO L321 Elim1Store]: treesize reduction 17, result has 29.2 percent of original size [2022-12-14 07:21:03,342 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 30 treesize of output 32 [2022-12-14 07:21:03,347 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 07:21:03,348 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 07:21:03,362 INFO L321 Elim1Store]: treesize reduction 40, result has 36.5 percent of original size [2022-12-14 07:21:03,362 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 66 treesize of output 51 [2022-12-14 07:21:04,936 INFO L321 Elim1Store]: treesize reduction 188, result has 70.5 percent of original size [2022-12-14 07:21:04,936 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 10 select indices, 10 select index equivalence classes, 0 disjoint index pairs (out of 45 index pairs), introduced 14 new quantified variables, introduced 45 case distinctions, treesize of input 241 treesize of output 597 [2022-12-14 07:21:05,630 INFO L321 Elim1Store]: treesize reduction 172, result has 67.5 percent of original size [2022-12-14 07:21:05,630 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 10 select indices, 10 select index equivalence classes, 0 disjoint index pairs (out of 45 index pairs), introduced 13 new quantified variables, introduced 45 case distinctions, treesize of input 437 treesize of output 670