./Ultimate.py --spec ../../sv-benchmarks/c/properties/valid-memsafety.prp --file ../../sv-benchmarks/c/list-simple/sll2n_remove_all_reverse.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for memory safety (deref-memtrack) Using default analysis Version 5e519f3a 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_051627c3-84bf-4ee4-b3b2-b2dd844ae3af/bin/utaipan-7li7fVZpFI/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_051627c3-84bf-4ee4-b3b2-b2dd844ae3af/bin/utaipan-7li7fVZpFI/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_051627c3-84bf-4ee4-b3b2-b2dd844ae3af/bin/utaipan-7li7fVZpFI/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_051627c3-84bf-4ee4-b3b2-b2dd844ae3af/bin/utaipan-7li7fVZpFI/config/TaipanMemDerefMemtrack.xml -i ../../sv-benchmarks/c/list-simple/sll2n_remove_all_reverse.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_051627c3-84bf-4ee4-b3b2-b2dd844ae3af/bin/utaipan-7li7fVZpFI/config/svcomp-DerefFreeMemtrack-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_051627c3-84bf-4ee4-b3b2-b2dd844ae3af/bin/utaipan-7li7fVZpFI --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 b3d7899c651fa61cfb9cf623e0f4ceb470fe32eb0d0272d2277c965ed07c2f88 --- 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-5e519f3 [2022-11-03 01:48:53,046 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-11-03 01:48:53,050 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-11-03 01:48:53,122 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-11-03 01:48:53,123 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-11-03 01:48:53,130 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-11-03 01:48:53,132 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-11-03 01:48:53,136 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-11-03 01:48:53,140 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-11-03 01:48:53,142 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-11-03 01:48:53,143 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-11-03 01:48:53,149 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-11-03 01:48:53,151 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-11-03 01:48:53,156 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-11-03 01:48:53,158 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-11-03 01:48:53,160 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-11-03 01:48:53,164 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-11-03 01:48:53,172 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-11-03 01:48:53,175 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-11-03 01:48:53,177 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-11-03 01:48:53,186 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-11-03 01:48:53,188 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-11-03 01:48:53,190 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-11-03 01:48:53,192 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-11-03 01:48:53,197 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-11-03 01:48:53,203 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-11-03 01:48:53,203 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-11-03 01:48:53,205 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-11-03 01:48:53,210 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-11-03 01:48:53,212 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-11-03 01:48:53,212 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-11-03 01:48:53,214 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-11-03 01:48:53,216 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-11-03 01:48:53,218 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-11-03 01:48:53,220 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-11-03 01:48:53,220 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-11-03 01:48:53,221 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-11-03 01:48:53,222 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-11-03 01:48:53,222 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-11-03 01:48:53,223 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-11-03 01:48:53,225 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-11-03 01:48:53,226 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_051627c3-84bf-4ee4-b3b2-b2dd844ae3af/bin/utaipan-7li7fVZpFI/config/svcomp-DerefFreeMemtrack-32bit-Taipan_Default.epf [2022-11-03 01:48:53,282 INFO L113 SettingsManager]: Loading preferences was successful [2022-11-03 01:48:53,283 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-11-03 01:48:53,284 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2022-11-03 01:48:53,284 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2022-11-03 01:48:53,285 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-11-03 01:48:53,286 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-11-03 01:48:53,286 INFO L138 SettingsManager]: * User list type=DISABLED [2022-11-03 01:48:53,286 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2022-11-03 01:48:53,287 INFO L138 SettingsManager]: * Explicit value domain=true [2022-11-03 01:48:53,287 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2022-11-03 01:48:53,288 INFO L138 SettingsManager]: * Octagon Domain=false [2022-11-03 01:48:53,289 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2022-11-03 01:48:53,289 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2022-11-03 01:48:53,289 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2022-11-03 01:48:53,290 INFO L138 SettingsManager]: * Interval Domain=false [2022-11-03 01:48:53,290 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2022-11-03 01:48:53,290 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2022-11-03 01:48:53,291 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2022-11-03 01:48:53,292 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2022-11-03 01:48:53,292 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2022-11-03 01:48:53,292 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-11-03 01:48:53,292 INFO L138 SettingsManager]: * sizeof long=4 [2022-11-03 01:48:53,293 INFO L138 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2022-11-03 01:48:53,293 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-11-03 01:48:53,293 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-11-03 01:48:53,294 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-11-03 01:48:53,294 INFO L138 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2022-11-03 01:48:53,294 INFO L138 SettingsManager]: * Bitprecise bitfields=true [2022-11-03 01:48:53,294 INFO L138 SettingsManager]: * SV-COMP memtrack compatibility mode=true [2022-11-03 01:48:53,295 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-11-03 01:48:53,295 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2022-11-03 01:48:53,295 INFO L138 SettingsManager]: * sizeof long double=12 [2022-11-03 01:48:53,296 INFO L138 SettingsManager]: * Use constant arrays=true [2022-11-03 01:48:53,296 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-11-03 01:48:53,296 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-11-03 01:48:53,297 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-03 01:48:53,297 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-11-03 01:48:53,297 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2022-11-03 01:48:53,298 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-11-03 01:48:53,298 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2022-11-03 01:48:53,298 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2022-11-03 01:48:53,298 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2022-11-03 01:48:53,299 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_051627c3-84bf-4ee4-b3b2-b2dd844ae3af/bin/utaipan-7li7fVZpFI/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_051627c3-84bf-4ee4-b3b2-b2dd844ae3af/bin/utaipan-7li7fVZpFI Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> b3d7899c651fa61cfb9cf623e0f4ceb470fe32eb0d0272d2277c965ed07c2f88 [2022-11-03 01:48:53,626 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-11-03 01:48:53,662 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-11-03 01:48:53,665 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-11-03 01:48:53,666 INFO L271 PluginConnector]: Initializing CDTParser... [2022-11-03 01:48:53,667 INFO L275 PluginConnector]: CDTParser initialized [2022-11-03 01:48:53,669 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_051627c3-84bf-4ee4-b3b2-b2dd844ae3af/bin/utaipan-7li7fVZpFI/../../sv-benchmarks/c/list-simple/sll2n_remove_all_reverse.i [2022-11-03 01:48:53,779 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_051627c3-84bf-4ee4-b3b2-b2dd844ae3af/bin/utaipan-7li7fVZpFI/data/60e1df730/70e3b16469cb427aba737b63ede0634f/FLAG70ec36ae9 [2022-11-03 01:48:54,477 INFO L306 CDTParser]: Found 1 translation units. [2022-11-03 01:48:54,478 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_051627c3-84bf-4ee4-b3b2-b2dd844ae3af/sv-benchmarks/c/list-simple/sll2n_remove_all_reverse.i [2022-11-03 01:48:54,491 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_051627c3-84bf-4ee4-b3b2-b2dd844ae3af/bin/utaipan-7li7fVZpFI/data/60e1df730/70e3b16469cb427aba737b63ede0634f/FLAG70ec36ae9 [2022-11-03 01:48:54,737 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_051627c3-84bf-4ee4-b3b2-b2dd844ae3af/bin/utaipan-7li7fVZpFI/data/60e1df730/70e3b16469cb427aba737b63ede0634f [2022-11-03 01:48:54,742 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-11-03 01:48:54,746 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2022-11-03 01:48:54,751 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-11-03 01:48:54,751 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-11-03 01:48:54,757 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-11-03 01:48:54,758 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 03.11 01:48:54" (1/1) ... [2022-11-03 01:48:54,763 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@596c7608 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 01:48:54, skipping insertion in model container [2022-11-03 01:48:54,764 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 03.11 01:48:54" (1/1) ... [2022-11-03 01:48:54,773 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-11-03 01:48:54,839 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-11-03 01:48:55,277 WARN L230 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_051627c3-84bf-4ee4-b3b2-b2dd844ae3af/sv-benchmarks/c/list-simple/sll2n_remove_all_reverse.i[24038,24051] [2022-11-03 01:48:55,280 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-03 01:48:55,289 INFO L203 MainTranslator]: Completed pre-run [2022-11-03 01:48:55,336 WARN L230 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_051627c3-84bf-4ee4-b3b2-b2dd844ae3af/sv-benchmarks/c/list-simple/sll2n_remove_all_reverse.i[24038,24051] [2022-11-03 01:48:55,337 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-03 01:48:55,366 INFO L208 MainTranslator]: Completed translation [2022-11-03 01:48:55,366 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 01:48:55 WrapperNode [2022-11-03 01:48:55,367 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-11-03 01:48:55,368 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2022-11-03 01:48:55,368 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2022-11-03 01:48:55,368 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2022-11-03 01:48:55,377 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 01:48:55" (1/1) ... [2022-11-03 01:48:55,391 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 01:48:55" (1/1) ... [2022-11-03 01:48:55,416 INFO L138 Inliner]: procedures = 126, calls = 30, calls flagged for inlining = 6, calls inlined = 6, statements flattened = 108 [2022-11-03 01:48:55,416 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2022-11-03 01:48:55,417 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-11-03 01:48:55,417 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-11-03 01:48:55,417 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-11-03 01:48:55,426 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 01:48:55" (1/1) ... [2022-11-03 01:48:55,427 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 01:48:55" (1/1) ... [2022-11-03 01:48:55,431 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 01:48:55" (1/1) ... [2022-11-03 01:48:55,431 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 01:48:55" (1/1) ... [2022-11-03 01:48:55,437 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 01:48:55" (1/1) ... [2022-11-03 01:48:55,453 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 01:48:55" (1/1) ... [2022-11-03 01:48:55,455 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 01:48:55" (1/1) ... [2022-11-03 01:48:55,471 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 01:48:55" (1/1) ... [2022-11-03 01:48:55,474 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-11-03 01:48:55,475 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-11-03 01:48:55,475 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-11-03 01:48:55,475 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-11-03 01:48:55,476 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 01:48:55" (1/1) ... [2022-11-03 01:48:55,484 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-03 01:48:55,496 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_051627c3-84bf-4ee4-b3b2-b2dd844ae3af/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 01:48:55,509 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_051627c3-84bf-4ee4-b3b2-b2dd844ae3af/bin/utaipan-7li7fVZpFI/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-11-03 01:48:55,542 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_051627c3-84bf-4ee4-b3b2-b2dd844ae3af/bin/utaipan-7li7fVZpFI/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-11-03 01:48:55,575 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2022-11-03 01:48:55,576 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2022-11-03 01:48:55,576 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-11-03 01:48:55,576 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2022-11-03 01:48:55,576 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2022-11-03 01:48:55,577 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2022-11-03 01:48:55,577 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2022-11-03 01:48:55,577 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~$Pointer$ [2022-11-03 01:48:55,577 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-11-03 01:48:55,577 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-11-03 01:48:55,578 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-11-03 01:48:55,801 INFO L235 CfgBuilder]: Building ICFG [2022-11-03 01:48:55,803 INFO L261 CfgBuilder]: Building CFG for each procedure with an implementation [2022-11-03 01:48:56,222 INFO L276 CfgBuilder]: Performing block encoding [2022-11-03 01:48:56,314 INFO L295 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-11-03 01:48:56,314 INFO L300 CfgBuilder]: Removed 3 assume(true) statements. [2022-11-03 01:48:56,318 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 03.11 01:48:56 BoogieIcfgContainer [2022-11-03 01:48:56,318 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-11-03 01:48:56,335 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-11-03 01:48:56,335 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-11-03 01:48:56,343 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-11-03 01:48:56,343 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 03.11 01:48:54" (1/3) ... [2022-11-03 01:48:56,344 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@11c1d36 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 03.11 01:48:56, skipping insertion in model container [2022-11-03 01:48:56,344 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 01:48:55" (2/3) ... [2022-11-03 01:48:56,345 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@11c1d36 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 03.11 01:48:56, skipping insertion in model container [2022-11-03 01:48:56,345 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 03.11 01:48:56" (3/3) ... [2022-11-03 01:48:56,350 INFO L112 eAbstractionObserver]: Analyzing ICFG sll2n_remove_all_reverse.i [2022-11-03 01:48:56,374 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2022-11-03 01:48:56,376 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 32 error locations. [2022-11-03 01:48:56,449 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-11-03 01:48:56,459 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;@6908095b, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2022-11-03 01:48:56,459 INFO L358 AbstractCegarLoop]: Starting to check reachability of 32 error locations. [2022-11-03 01:48:56,473 INFO L276 IsEmpty]: Start isEmpty. Operand has 62 states, 29 states have (on average 2.3448275862068964) internal successors, (68), 61 states have internal predecessors, (68), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 01:48:56,482 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5 [2022-11-03 01:48:56,482 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 01:48:56,483 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1] [2022-11-03 01:48:56,484 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr28REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 29 more)] === [2022-11-03 01:48:56,495 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 01:48:56,496 INFO L85 PathProgramCache]: Analyzing trace with hash 4990986, now seen corresponding path program 1 times [2022-11-03 01:48:56,508 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 01:48:56,509 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [343344725] [2022-11-03 01:48:56,509 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 01:48:56,510 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 01:48:56,658 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 01:48:56,850 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 01:48:56,852 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 01:48:56,853 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [343344725] [2022-11-03 01:48:56,854 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [343344725] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-03 01:48:56,854 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-03 01:48:56,854 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2022-11-03 01:48:56,858 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1631097060] [2022-11-03 01:48:56,859 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-03 01:48:56,865 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-03 01:48:56,867 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 01:48:56,912 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-03 01:48:56,914 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-03 01:48:56,918 INFO L87 Difference]: Start difference. First operand has 62 states, 29 states have (on average 2.3448275862068964) internal successors, (68), 61 states have internal predecessors, (68), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 3 states, 3 states have (on average 1.3333333333333333) internal successors, (4), 2 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 01:48:57,010 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 01:48:57,011 INFO L93 Difference]: Finished difference Result 74 states and 79 transitions. [2022-11-03 01:48:57,013 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-03 01:48:57,015 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 1.3333333333333333) internal successors, (4), 2 states have internal predecessors, (4), 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 4 [2022-11-03 01:48:57,016 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 01:48:57,026 INFO L225 Difference]: With dead ends: 74 [2022-11-03 01:48:57,027 INFO L226 Difference]: Without dead ends: 71 [2022-11-03 01:48:57,029 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-03 01:48:57,034 INFO L413 NwaCegarLoop]: 56 mSDtfsCounter, 12 mSDsluCounter, 62 mSDsCounter, 0 mSdLazyCounter, 19 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 12 SdHoareTripleChecker+Valid, 112 SdHoareTripleChecker+Invalid, 19 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 19 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-03 01:48:57,035 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [12 Valid, 112 Invalid, 19 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 19 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-03 01:48:57,057 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 71 states. [2022-11-03 01:48:57,076 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 71 to 61. [2022-11-03 01:48:57,078 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 61 states, 29 states have (on average 2.206896551724138) internal successors, (64), 60 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) [2022-11-03 01:48:57,080 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 64 transitions. [2022-11-03 01:48:57,081 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 64 transitions. Word has length 4 [2022-11-03 01:48:57,081 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 01:48:57,084 INFO L495 AbstractCegarLoop]: Abstraction has 61 states and 64 transitions. [2022-11-03 01:48:57,085 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 1.3333333333333333) internal successors, (4), 2 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 01:48:57,086 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 64 transitions. [2022-11-03 01:48:57,086 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5 [2022-11-03 01:48:57,086 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 01:48:57,087 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1] [2022-11-03 01:48:57,087 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-11-03 01:48:57,087 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 29 more)] === [2022-11-03 01:48:57,089 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 01:48:57,089 INFO L85 PathProgramCache]: Analyzing trace with hash 4866058, now seen corresponding path program 1 times [2022-11-03 01:48:57,089 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 01:48:57,090 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1689937914] [2022-11-03 01:48:57,090 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 01:48:57,090 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 01:48:57,132 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 01:48:57,257 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 01:48:57,257 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 01:48:57,257 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1689937914] [2022-11-03 01:48:57,258 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1689937914] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-03 01:48:57,258 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-03 01:48:57,258 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2022-11-03 01:48:57,258 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1510927149] [2022-11-03 01:48:57,259 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-03 01:48:57,260 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-03 01:48:57,260 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 01:48:57,261 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-03 01:48:57,261 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-03 01:48:57,261 INFO L87 Difference]: Start difference. First operand 61 states and 64 transitions. Second operand has 3 states, 2 states have (on average 2.0) internal successors, (4), 3 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 01:48:57,462 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 01:48:57,462 INFO L93 Difference]: Finished difference Result 101 states and 107 transitions. [2022-11-03 01:48:57,463 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-03 01:48:57,463 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 2.0) internal successors, (4), 3 states have internal predecessors, (4), 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 4 [2022-11-03 01:48:57,463 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 01:48:57,465 INFO L225 Difference]: With dead ends: 101 [2022-11-03 01:48:57,465 INFO L226 Difference]: Without dead ends: 101 [2022-11-03 01:48:57,465 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-03 01:48:57,467 INFO L413 NwaCegarLoop]: 29 mSDtfsCounter, 50 mSDsluCounter, 26 mSDsCounter, 0 mSdLazyCounter, 60 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 50 SdHoareTripleChecker+Valid, 53 SdHoareTripleChecker+Invalid, 61 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 60 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-03 01:48:57,468 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [50 Valid, 53 Invalid, 61 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 60 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-03 01:48:57,469 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 101 states. [2022-11-03 01:48:57,473 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 101 to 59. [2022-11-03 01:48:57,482 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 59 states, 29 states have (on average 2.1379310344827585) internal successors, (62), 58 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) [2022-11-03 01:48:57,483 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 62 transitions. [2022-11-03 01:48:57,484 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 62 transitions. Word has length 4 [2022-11-03 01:48:57,484 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 01:48:57,484 INFO L495 AbstractCegarLoop]: Abstraction has 59 states and 62 transitions. [2022-11-03 01:48:57,484 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 2.0) internal successors, (4), 3 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 01:48:57,485 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 62 transitions. [2022-11-03 01:48:57,485 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5 [2022-11-03 01:48:57,485 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 01:48:57,485 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1] [2022-11-03 01:48:57,486 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2022-11-03 01:48:57,486 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 29 more)] === [2022-11-03 01:48:57,487 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 01:48:57,487 INFO L85 PathProgramCache]: Analyzing trace with hash 4866059, now seen corresponding path program 1 times [2022-11-03 01:48:57,487 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 01:48:57,487 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [376221160] [2022-11-03 01:48:57,488 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 01:48:57,490 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 01:48:57,512 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 01:48:57,628 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 01:48:57,629 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 01:48:57,629 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [376221160] [2022-11-03 01:48:57,629 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [376221160] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-03 01:48:57,629 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-03 01:48:57,631 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2022-11-03 01:48:57,631 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [495873120] [2022-11-03 01:48:57,632 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-03 01:48:57,632 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-03 01:48:57,633 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 01:48:57,634 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-03 01:48:57,635 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-03 01:48:57,637 INFO L87 Difference]: Start difference. First operand 59 states and 62 transitions. Second operand has 3 states, 2 states have (on average 2.0) internal successors, (4), 3 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 01:48:57,736 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 01:48:57,736 INFO L93 Difference]: Finished difference Result 57 states and 60 transitions. [2022-11-03 01:48:57,737 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-03 01:48:57,737 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 2.0) internal successors, (4), 3 states have internal predecessors, (4), 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 4 [2022-11-03 01:48:57,738 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 01:48:57,738 INFO L225 Difference]: With dead ends: 57 [2022-11-03 01:48:57,739 INFO L226 Difference]: Without dead ends: 57 [2022-11-03 01:48:57,739 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-03 01:48:57,741 INFO L413 NwaCegarLoop]: 32 mSDtfsCounter, 56 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 29 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 56 SdHoareTripleChecker+Valid, 32 SdHoareTripleChecker+Invalid, 30 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 29 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-03 01:48:57,741 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [56 Valid, 32 Invalid, 30 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 29 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-03 01:48:57,742 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2022-11-03 01:48:57,746 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 57. [2022-11-03 01:48:57,751 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 57 states, 29 states have (on average 2.0689655172413794) internal successors, (60), 56 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) [2022-11-03 01:48:57,755 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 60 transitions. [2022-11-03 01:48:57,755 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 60 transitions. Word has length 4 [2022-11-03 01:48:57,755 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 01:48:57,756 INFO L495 AbstractCegarLoop]: Abstraction has 57 states and 60 transitions. [2022-11-03 01:48:57,758 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 2.0) internal successors, (4), 3 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 01:48:57,758 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 60 transitions. [2022-11-03 01:48:57,759 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2022-11-03 01:48:57,759 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 01:48:57,759 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2022-11-03 01:48:57,759 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2022-11-03 01:48:57,760 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr4REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 29 more)] === [2022-11-03 01:48:57,760 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 01:48:57,761 INFO L85 PathProgramCache]: Analyzing trace with hash 381317508, now seen corresponding path program 1 times [2022-11-03 01:48:57,761 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 01:48:57,761 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1948054759] [2022-11-03 01:48:57,761 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 01:48:57,762 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 01:48:57,780 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 01:48:57,911 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 01:48:57,911 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 01:48:57,911 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1948054759] [2022-11-03 01:48:57,911 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1948054759] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-03 01:48:57,912 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-03 01:48:57,912 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-11-03 01:48:57,912 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [823348669] [2022-11-03 01:48:57,912 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-03 01:48:57,913 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-11-03 01:48:57,913 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 01:48:57,913 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-11-03 01:48:57,913 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-11-03 01:48:57,914 INFO L87 Difference]: Start difference. First operand 57 states and 60 transitions. Second operand has 4 states, 3 states have (on average 2.0) internal successors, (6), 4 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 01:48:58,082 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 01:48:58,083 INFO L93 Difference]: Finished difference Result 101 states and 107 transitions. [2022-11-03 01:48:58,083 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-11-03 01:48:58,084 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 2.0) internal successors, (6), 4 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 6 [2022-11-03 01:48:58,084 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 01:48:58,085 INFO L225 Difference]: With dead ends: 101 [2022-11-03 01:48:58,085 INFO L226 Difference]: Without dead ends: 101 [2022-11-03 01:48:58,085 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2022-11-03 01:48:58,087 INFO L413 NwaCegarLoop]: 28 mSDtfsCounter, 94 mSDsluCounter, 52 mSDsCounter, 0 mSdLazyCounter, 91 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 94 SdHoareTripleChecker+Valid, 76 SdHoareTripleChecker+Invalid, 93 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 91 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-03 01:48:58,088 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [94 Valid, 76 Invalid, 93 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 91 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-03 01:48:58,089 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 101 states. [2022-11-03 01:48:58,094 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 101 to 56. [2022-11-03 01:48:58,094 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 56 states, 29 states have (on average 2.0344827586206895) internal successors, (59), 55 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) [2022-11-03 01:48:58,095 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 59 transitions. [2022-11-03 01:48:58,095 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 59 transitions. Word has length 6 [2022-11-03 01:48:58,096 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 01:48:58,096 INFO L495 AbstractCegarLoop]: Abstraction has 56 states and 59 transitions. [2022-11-03 01:48:58,096 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 2.0) internal successors, (6), 4 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 01:48:58,096 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 59 transitions. [2022-11-03 01:48:58,097 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2022-11-03 01:48:58,097 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 01:48:58,097 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2022-11-03 01:48:58,097 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2022-11-03 01:48:58,098 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 29 more)] === [2022-11-03 01:48:58,098 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 01:48:58,098 INFO L85 PathProgramCache]: Analyzing trace with hash 381317509, now seen corresponding path program 1 times [2022-11-03 01:48:58,099 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 01:48:58,099 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [308548854] [2022-11-03 01:48:58,099 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 01:48:58,106 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 01:48:58,131 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 01:48:58,266 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 01:48:58,267 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 01:48:58,267 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [308548854] [2022-11-03 01:48:58,267 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [308548854] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-03 01:48:58,268 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-03 01:48:58,268 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-11-03 01:48:58,268 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1554374924] [2022-11-03 01:48:58,269 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-03 01:48:58,269 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-11-03 01:48:58,269 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 01:48:58,270 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-11-03 01:48:58,270 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-11-03 01:48:58,270 INFO L87 Difference]: Start difference. First operand 56 states and 59 transitions. Second operand has 4 states, 3 states have (on average 2.0) internal successors, (6), 4 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 01:48:58,380 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 01:48:58,380 INFO L93 Difference]: Finished difference Result 58 states and 61 transitions. [2022-11-03 01:48:58,381 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-11-03 01:48:58,381 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 2.0) internal successors, (6), 4 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 6 [2022-11-03 01:48:58,381 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 01:48:58,382 INFO L225 Difference]: With dead ends: 58 [2022-11-03 01:48:58,382 INFO L226 Difference]: Without dead ends: 58 [2022-11-03 01:48:58,383 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 [2022-11-03 01:48:58,384 INFO L413 NwaCegarLoop]: 31 mSDtfsCounter, 107 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 35 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 107 SdHoareTripleChecker+Valid, 31 SdHoareTripleChecker+Invalid, 36 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 35 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-03 01:48:58,385 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [107 Valid, 31 Invalid, 36 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 35 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-03 01:48:58,386 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2022-11-03 01:48:58,389 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 55. [2022-11-03 01:48:58,390 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 55 states, 29 states have (on average 2.0) internal successors, (58), 54 states have internal predecessors, (58), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 01:48:58,390 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 58 transitions. [2022-11-03 01:48:58,391 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 58 transitions. Word has length 6 [2022-11-03 01:48:58,391 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 01:48:58,391 INFO L495 AbstractCegarLoop]: Abstraction has 55 states and 58 transitions. [2022-11-03 01:48:58,392 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 2.0) internal successors, (6), 4 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 01:48:58,392 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 58 transitions. [2022-11-03 01:48:58,392 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2022-11-03 01:48:58,393 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 01:48:58,393 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 01:48:58,393 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2022-11-03 01:48:58,393 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr28REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 29 more)] === [2022-11-03 01:48:58,394 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 01:48:58,394 INFO L85 PathProgramCache]: Analyzing trace with hash -355324193, now seen corresponding path program 1 times [2022-11-03 01:48:58,394 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 01:48:58,395 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [33208174] [2022-11-03 01:48:58,395 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 01:48:58,395 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 01:48:58,415 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 01:48:58,543 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 01:48:58,544 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 01:48:58,544 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [33208174] [2022-11-03 01:48:58,544 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [33208174] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 01:48:58,545 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [446714981] [2022-11-03 01:48:58,545 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 01:48:58,545 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 01:48:58,545 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_051627c3-84bf-4ee4-b3b2-b2dd844ae3af/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 01:48:58,548 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_051627c3-84bf-4ee4-b3b2-b2dd844ae3af/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 01:48:58,577 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_051627c3-84bf-4ee4-b3b2-b2dd844ae3af/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-11-03 01:48:58,661 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 01:48:58,664 INFO L263 TraceCheckSpWp]: Trace formula consists of 143 conjuncts, 5 conjunts are in the unsatisfiable core [2022-11-03 01:48:58,669 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 01:48:58,731 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 01:48:58,731 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 01:48:58,766 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 01:48:58,767 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [446714981] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 01:48:58,767 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1540949938] [2022-11-03 01:48:58,787 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2022-11-03 01:48:58,788 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 01:48:58,792 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 01:48:58,798 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 01:48:58,799 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 01:48:58,919 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:48:58,928 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:48:58,941 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 [2022-11-03 01:48:58,991 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:48:58,993 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:48:58,995 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:48:58,997 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:48:58,999 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:48:59,001 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 [2022-11-03 01:48:59,100 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 13 treesize of output 9 [2022-11-03 01:48:59,117 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 13 treesize of output 9 [2022-11-03 01:48:59,138 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:48:59,143 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 34 treesize of output 21 [2022-11-03 01:48:59,228 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:48:59,230 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 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 25 treesize of output 13 [2022-11-03 01:48:59,258 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:48:59,259 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:48:59,261 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 26 treesize of output 28 [2022-11-03 01:48:59,285 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:48:59,286 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 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 25 treesize of output 13 [2022-11-03 01:48:59,354 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:48:59,356 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:48:59,358 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:48:59,360 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 41 treesize of output 31 [2022-11-03 01:48:59,384 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-03 01:48:59,385 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 13 [2022-11-03 01:48:59,405 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-03 01:48:59,407 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 13 [2022-11-03 01:48:59,486 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:48:59,488 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:48:59,489 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:48:59,491 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:48:59,492 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:48:59,494 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:48:59,495 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:48:59,497 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:48:59,498 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:48:59,500 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 13 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 0 case distinctions, treesize of input 34 treesize of output 43 [2022-11-03 01:48:59,726 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:48:59,728 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:48:59,740 INFO L356 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2022-11-03 01:48:59,741 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 3 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 345 treesize of output 327 [2022-11-03 01:48:59,814 INFO L356 Elim1Store]: treesize reduction 19, result has 47.2 percent of original size [2022-11-03 01:48:59,817 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 339 treesize of output 346 [2022-11-03 01:48:59,886 INFO L356 Elim1Store]: treesize reduction 19, result has 47.2 percent of original size [2022-11-03 01:48:59,887 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 333 treesize of output 340 [2022-11-03 01:49:00,239 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:49:00,299 INFO L356 Elim1Store]: treesize reduction 37, result has 33.9 percent of original size [2022-11-03 01:49:00,300 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 2 case distinctions, treesize of input 366 treesize of output 367 [2022-11-03 01:49:00,341 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-03 01:49:00,387 INFO L356 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-11-03 01:49:00,388 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 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 347 treesize of output 348 [2022-11-03 01:49:00,451 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:49:00,515 INFO L356 Elim1Store]: treesize reduction 37, result has 33.9 percent of original size [2022-11-03 01:49:00,515 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 2 case distinctions, treesize of input 356 treesize of output 357 [2022-11-03 01:49:01,454 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:49:01,456 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:49:01,458 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:49:01,460 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-03 01:49:01,471 INFO L356 Elim1Store]: treesize reduction 24, result has 4.0 percent of original size [2022-11-03 01:49:01,472 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 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 5 case distinctions, treesize of input 356 treesize of output 341 [2022-11-03 01:49:01,512 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-03 01:49:01,514 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-03 01:49:01,538 INFO L356 Elim1Store]: treesize reduction 25, result has 21.9 percent of original size [2022-11-03 01:49:01,539 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 2 new quantified variables, introduced 2 case distinctions, treesize of input 352 treesize of output 345 [2022-11-03 01:49:01,571 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-03 01:49:01,572 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-03 01:49:01,596 INFO L356 Elim1Store]: treesize reduction 49, result has 21.0 percent of original size [2022-11-03 01:49:01,596 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 2 new quantified variables, introduced 2 case distinctions, treesize of input 424 treesize of output 417 [2022-11-03 01:49:01,808 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:49:01,912 INFO L356 Elim1Store]: treesize reduction 170, result has 13.7 percent of original size [2022-11-03 01:49:01,913 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 3 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 13 case distinctions, treesize of input 425 treesize of output 429 [2022-11-03 01:49:02,268 INFO L356 Elim1Store]: treesize reduction 19, result has 47.2 percent of original size [2022-11-03 01:49:02,269 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 339 treesize of output 346 [2022-11-03 01:49:02,295 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:49:02,297 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:49:02,312 INFO L356 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2022-11-03 01:49:02,312 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 3 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 339 treesize of output 321 [2022-11-03 01:49:02,380 INFO L356 Elim1Store]: treesize reduction 19, result has 47.2 percent of original size [2022-11-03 01:49:02,381 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 333 treesize of output 340 [2022-11-03 01:49:02,810 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-03 01:49:02,863 INFO L356 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-11-03 01:49:02,864 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 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 659 treesize of output 640 [2022-11-03 01:49:02,918 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:49:02,977 INFO L356 Elim1Store]: treesize reduction 37, result has 33.9 percent of original size [2022-11-03 01:49:02,977 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 2 case distinctions, treesize of input 664 treesize of output 665 [2022-11-03 01:49:03,019 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:49:03,087 INFO L356 Elim1Store]: treesize reduction 37, result has 33.9 percent of original size [2022-11-03 01:49:03,087 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 2 case distinctions, treesize of input 658 treesize of output 659 [2022-11-03 01:49:03,887 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:49:03,890 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:49:03,893 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:49:03,894 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-03 01:49:03,912 INFO L356 Elim1Store]: treesize reduction 24, result has 4.0 percent of original size [2022-11-03 01:49:03,913 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 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 5 case distinctions, treesize of input 356 treesize of output 341 [2022-11-03 01:49:03,950 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-03 01:49:03,952 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-03 01:49:03,977 INFO L356 Elim1Store]: treesize reduction 25, result has 21.9 percent of original size [2022-11-03 01:49:03,977 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 2 new quantified variables, introduced 2 case distinctions, treesize of input 352 treesize of output 345 [2022-11-03 01:49:04,016 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-03 01:49:04,017 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-03 01:49:04,042 INFO L356 Elim1Store]: treesize reduction 49, result has 21.0 percent of original size [2022-11-03 01:49:04,043 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 2 new quantified variables, introduced 2 case distinctions, treesize of input 424 treesize of output 417 [2022-11-03 01:49:04,242 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 [2022-11-03 01:49:04,252 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 [2022-11-03 01:49:04,259 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 01:49:07,900 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSifa [1540949938] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-03 01:49:07,900 INFO L184 FreeRefinementEngine]: Found 1 perfect and 3 imperfect interpolant sequences. [2022-11-03 01:49:07,900 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [3, 3, 3] total 10 [2022-11-03 01:49:07,901 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1606512414] [2022-11-03 01:49:07,901 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-03 01:49:07,902 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2022-11-03 01:49:07,902 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 01:49:07,902 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2022-11-03 01:49:07,902 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=75, Unknown=0, NotChecked=0, Total=110 [2022-11-03 01:49:07,903 INFO L87 Difference]: Start difference. First operand 55 states and 58 transitions. Second operand has 8 states, 8 states have (on average 1.125) internal successors, (9), 7 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 01:49:08,459 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 01:49:08,459 INFO L93 Difference]: Finished difference Result 88 states and 93 transitions. [2022-11-03 01:49:08,459 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2022-11-03 01:49:08,460 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 1.125) internal successors, (9), 7 states have internal predecessors, (9), 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 9 [2022-11-03 01:49:08,460 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 01:49:08,460 INFO L225 Difference]: With dead ends: 88 [2022-11-03 01:49:08,461 INFO L226 Difference]: Without dead ends: 88 [2022-11-03 01:49:08,461 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 17 SyntacticMatches, 2 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 3.7s TimeCoverageRelationStatistics Valid=35, Invalid=75, Unknown=0, NotChecked=0, Total=110 [2022-11-03 01:49:08,462 INFO L413 NwaCegarLoop]: 31 mSDtfsCounter, 84 mSDsluCounter, 68 mSDsCounter, 0 mSdLazyCounter, 189 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 84 SdHoareTripleChecker+Valid, 93 SdHoareTripleChecker+Invalid, 194 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 189 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-11-03 01:49:08,462 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [84 Valid, 93 Invalid, 194 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 189 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-11-03 01:49:08,463 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2022-11-03 01:49:08,467 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 56. [2022-11-03 01:49:08,467 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 56 states, 30 states have (on average 1.9666666666666666) internal successors, (59), 55 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) [2022-11-03 01:49:08,468 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 59 transitions. [2022-11-03 01:49:08,468 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 59 transitions. Word has length 9 [2022-11-03 01:49:08,468 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 01:49:08,469 INFO L495 AbstractCegarLoop]: Abstraction has 56 states and 59 transitions. [2022-11-03 01:49:08,469 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 1.125) internal successors, (9), 7 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 01:49:08,469 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 59 transitions. [2022-11-03 01:49:08,469 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2022-11-03 01:49:08,469 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 01:49:08,470 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 01:49:08,526 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_051627c3-84bf-4ee4-b3b2-b2dd844ae3af/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2022-11-03 01:49:08,698 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_051627c3-84bf-4ee4-b3b2-b2dd844ae3af/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 01:49:08,698 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr6REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 29 more)] === [2022-11-03 01:49:08,699 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 01:49:08,699 INFO L85 PathProgramCache]: Analyzing trace with hash -355327076, now seen corresponding path program 1 times [2022-11-03 01:49:08,699 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 01:49:08,700 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [542933940] [2022-11-03 01:49:08,700 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 01:49:08,700 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 01:49:08,719 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 01:49:08,778 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 01:49:08,778 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 01:49:08,778 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [542933940] [2022-11-03 01:49:08,778 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [542933940] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 01:49:08,779 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [954958953] [2022-11-03 01:49:08,779 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 01:49:08,779 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 01:49:08,779 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_051627c3-84bf-4ee4-b3b2-b2dd844ae3af/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 01:49:08,780 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_051627c3-84bf-4ee4-b3b2-b2dd844ae3af/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 01:49:08,802 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_051627c3-84bf-4ee4-b3b2-b2dd844ae3af/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-11-03 01:49:08,892 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 01:49:08,894 INFO L263 TraceCheckSpWp]: Trace formula consists of 151 conjuncts, 5 conjunts are in the unsatisfiable core [2022-11-03 01:49:08,898 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 01:49:08,960 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 01:49:08,960 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 01:49:08,988 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 01:49:08,988 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [954958953] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 01:49:08,988 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [172525775] [2022-11-03 01:49:08,990 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2022-11-03 01:49:08,991 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 01:49:08,991 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 01:49:08,991 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 01:49:08,991 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 01:49:09,020 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:49:09,021 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:49:09,023 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 [2022-11-03 01:49:09,057 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:49:09,059 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:49:09,060 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:49:09,062 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:49:09,064 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:49:09,066 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 [2022-11-03 01:49:09,130 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 13 treesize of output 9 [2022-11-03 01:49:09,145 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:49:09,147 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 34 treesize of output 21 [2022-11-03 01:49:09,164 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 13 treesize of output 9 [2022-11-03 01:49:09,195 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:49:09,201 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 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 25 treesize of output 13 [2022-11-03 01:49:09,215 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:49:09,216 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:49:09,218 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 26 treesize of output 28 [2022-11-03 01:49:09,233 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:49:09,234 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 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 25 treesize of output 13 [2022-11-03 01:49:09,286 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-03 01:49:09,288 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 13 [2022-11-03 01:49:09,306 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:49:09,308 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:49:09,310 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:49:09,313 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 41 treesize of output 31 [2022-11-03 01:49:09,332 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-03 01:49:09,333 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 13 [2022-11-03 01:49:09,377 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:49:09,379 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:49:09,381 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:49:09,382 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:49:09,384 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:49:09,386 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:49:09,387 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:49:09,390 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:49:09,392 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:49:09,396 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 13 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 0 case distinctions, treesize of input 34 treesize of output 43 [2022-11-03 01:49:09,529 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:49:09,531 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:49:09,540 INFO L356 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2022-11-03 01:49:09,541 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 3 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 345 treesize of output 327 [2022-11-03 01:49:09,608 INFO L356 Elim1Store]: treesize reduction 19, result has 47.2 percent of original size [2022-11-03 01:49:09,609 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 339 treesize of output 346 [2022-11-03 01:49:09,677 INFO L356 Elim1Store]: treesize reduction 19, result has 47.2 percent of original size [2022-11-03 01:49:09,677 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 333 treesize of output 340 [2022-11-03 01:49:09,908 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:49:09,950 INFO L356 Elim1Store]: treesize reduction 37, result has 33.9 percent of original size [2022-11-03 01:49:09,950 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 2 case distinctions, treesize of input 366 treesize of output 367 [2022-11-03 01:49:09,979 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-03 01:49:10,020 INFO L356 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-11-03 01:49:10,021 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 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 347 treesize of output 348 [2022-11-03 01:49:10,065 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:49:10,115 INFO L356 Elim1Store]: treesize reduction 37, result has 33.9 percent of original size [2022-11-03 01:49:10,116 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 2 case distinctions, treesize of input 356 treesize of output 357 [2022-11-03 01:49:10,560 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-03 01:49:10,561 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-03 01:49:10,586 INFO L356 Elim1Store]: treesize reduction 25, result has 21.9 percent of original size [2022-11-03 01:49:10,586 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 2 new quantified variables, introduced 2 case distinctions, treesize of input 356 treesize of output 349 [2022-11-03 01:49:10,616 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:49:10,618 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:49:10,619 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:49:10,620 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-03 01:49:10,631 INFO L356 Elim1Store]: treesize reduction 36, result has 2.7 percent of original size [2022-11-03 01:49:10,631 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 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 5 case distinctions, treesize of input 438 treesize of output 423 [2022-11-03 01:49:10,656 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-03 01:49:10,657 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-03 01:49:10,674 INFO L356 Elim1Store]: treesize reduction 49, result has 21.0 percent of original size [2022-11-03 01:49:10,675 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 2 new quantified variables, introduced 2 case distinctions, treesize of input 434 treesize of output 427 [2022-11-03 01:49:10,881 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:49:10,958 INFO L356 Elim1Store]: treesize reduction 170, result has 13.7 percent of original size [2022-11-03 01:49:10,958 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 3 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 13 case distinctions, treesize of input 435 treesize of output 439 [2022-11-03 01:49:11,348 INFO L356 Elim1Store]: treesize reduction 19, result has 47.2 percent of original size [2022-11-03 01:49:11,348 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 339 treesize of output 346 [2022-11-03 01:49:11,372 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:49:11,374 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:49:11,384 INFO L356 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2022-11-03 01:49:11,384 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 3 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 339 treesize of output 321 [2022-11-03 01:49:11,460 INFO L356 Elim1Store]: treesize reduction 19, result has 47.2 percent of original size [2022-11-03 01:49:11,460 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 333 treesize of output 340 [2022-11-03 01:49:11,690 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-03 01:49:11,734 INFO L356 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-11-03 01:49:11,735 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 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 353 treesize of output 354 [2022-11-03 01:49:11,760 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:49:11,802 INFO L356 Elim1Store]: treesize reduction 37, result has 33.9 percent of original size [2022-11-03 01:49:11,803 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 2 case distinctions, treesize of input 362 treesize of output 363 [2022-11-03 01:49:11,832 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:49:11,877 INFO L356 Elim1Store]: treesize reduction 37, result has 33.9 percent of original size [2022-11-03 01:49:11,878 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 2 case distinctions, treesize of input 356 treesize of output 357 [2022-11-03 01:49:12,349 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:49:12,351 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:49:12,355 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:49:12,356 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-03 01:49:12,368 INFO L356 Elim1Store]: treesize reduction 24, result has 4.0 percent of original size [2022-11-03 01:49:12,369 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 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 5 case distinctions, treesize of input 360 treesize of output 345 [2022-11-03 01:49:12,397 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-03 01:49:12,399 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-03 01:49:12,422 INFO L356 Elim1Store]: treesize reduction 25, result has 21.9 percent of original size [2022-11-03 01:49:12,422 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 2 new quantified variables, introduced 2 case distinctions, treesize of input 356 treesize of output 349 [2022-11-03 01:49:12,453 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-03 01:49:12,455 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-03 01:49:12,476 INFO L356 Elim1Store]: treesize reduction 25, result has 21.9 percent of original size [2022-11-03 01:49:12,476 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 2 new quantified variables, introduced 2 case distinctions, treesize of input 368 treesize of output 361 [2022-11-03 01:49:12,657 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 [2022-11-03 01:49:12,665 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 [2022-11-03 01:49:12,671 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 01:49:16,084 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1022#(and (= |ULTIMATE.start_sll_remove_last_~head#1.base| |ULTIMATE.start_sll_remove_last_#in~head#1.base|) (= |ULTIMATE.start_sll_create_~head~0#1.base| |ULTIMATE.start_sll_create_#res#1.base|) (= |ULTIMATE.start_sll_remove_last_#in~head#1.offset| |ULTIMATE.start_main_~#s~0#1.offset|) (= (select (select |#memory_$Pointer$.offset| |ULTIMATE.start_main_~#s~0#1.base|) |ULTIMATE.start_main_~#s~0#1.offset|) |ULTIMATE.start_sll_create_#res#1.offset|) (<= 1 |ULTIMATE.start_sll_create_#in~data#1|) (<= |ULTIMATE.start_sll_create_#in~data#1| 1) (<= |ULTIMATE.start_sll_create_~head~0#1.offset| 0) (<= |ULTIMATE.start_sll_create_~len#1| 0) (<= |#NULL.offset| 0) (= |ULTIMATE.start_sll_remove_last_#in~head#1.offset| |ULTIMATE.start_sll_remove_last_~head#1.offset|) (<= 1 |ULTIMATE.start_sll_create_~data#1|) (not (= (select |#valid| |ULTIMATE.start_sll_remove_last_~head#1.base|) 1)) (= |ULTIMATE.start_main_~data~0#1| 1) (<= |ULTIMATE.start_sll_create_~data#1| 1) (<= |ULTIMATE.start_sll_create_#in~len#1| 2) (<= 0 |ULTIMATE.start_sll_create_~len#1|) (= |ULTIMATE.start_main_~len~0#1| 2) (= |ULTIMATE.start_sll_create_#res#1.offset| |ULTIMATE.start_sll_create_~head~0#1.offset|) (<= |ULTIMATE.start_main_~#s~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~#s~0#1.base|) (= |ULTIMATE.start_sll_remove_last_#in~head#1.base| |ULTIMATE.start_main_~#s~0#1.base|) (<= 0 |#NULL.offset|) (= (select (select |#memory_$Pointer$.base| |ULTIMATE.start_main_~#s~0#1.base|) |ULTIMATE.start_main_~#s~0#1.offset|) |ULTIMATE.start_sll_create_#res#1.base|) (<= 0 |#StackHeapBarrier|) (<= 2 |ULTIMATE.start_sll_create_#in~len#1|) (= |ULTIMATE.start_main_~len~0#1| (+ |ULTIMATE.start_main_~i~0#1| 1)) (<= 0 |ULTIMATE.start_main_~#s~0#1.offset|) (<= 0 |ULTIMATE.start_sll_create_~head~0#1.offset|) (= |#NULL.base| 0))' at error location [2022-11-03 01:49:16,084 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 01:49:16,085 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 01:49:16,085 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3, 3] total 4 [2022-11-03 01:49:16,085 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1763363651] [2022-11-03 01:49:16,085 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 01:49:16,085 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-11-03 01:49:16,086 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 01:49:16,086 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-11-03 01:49:16,086 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=112, Unknown=0, NotChecked=0, Total=156 [2022-11-03 01:49:16,087 INFO L87 Difference]: Start difference. First operand 56 states and 59 transitions. Second operand has 5 states, 5 states have (on average 3.0) internal successors, (15), 4 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) [2022-11-03 01:49:16,120 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 01:49:16,120 INFO L93 Difference]: Finished difference Result 61 states and 64 transitions. [2022-11-03 01:49:16,120 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-11-03 01:49:16,120 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 3.0) internal successors, (15), 4 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 9 [2022-11-03 01:49:16,120 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 01:49:16,121 INFO L225 Difference]: With dead ends: 61 [2022-11-03 01:49:16,121 INFO L226 Difference]: Without dead ends: 61 [2022-11-03 01:49:16,122 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 15 SyntacticMatches, 2 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 34 ImplicationChecksByTransitivity, 3.4s TimeCoverageRelationStatistics Valid=44, Invalid=112, Unknown=0, NotChecked=0, Total=156 [2022-11-03 01:49:16,123 INFO L413 NwaCegarLoop]: 48 mSDtfsCounter, 8 mSDsluCounter, 106 mSDsCounter, 0 mSdLazyCounter, 26 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 8 SdHoareTripleChecker+Valid, 144 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 [2022-11-03 01:49:16,123 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [8 Valid, 144 Invalid, 28 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 26 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-03 01:49:16,124 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2022-11-03 01:49:16,127 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 61. [2022-11-03 01:49:16,127 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 61 states, 35 states have (on average 1.8285714285714285) internal successors, (64), 60 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) [2022-11-03 01:49:16,128 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 64 transitions. [2022-11-03 01:49:16,129 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 64 transitions. Word has length 9 [2022-11-03 01:49:16,129 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 01:49:16,129 INFO L495 AbstractCegarLoop]: Abstraction has 61 states and 64 transitions. [2022-11-03 01:49:16,129 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 3.0) internal successors, (15), 4 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) [2022-11-03 01:49:16,129 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 64 transitions. [2022-11-03 01:49:16,130 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2022-11-03 01:49:16,130 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 01:49:16,130 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1] [2022-11-03 01:49:16,162 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_051627c3-84bf-4ee4-b3b2-b2dd844ae3af/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2022-11-03 01:49:16,342 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_051627c3-84bf-4ee4-b3b2-b2dd844ae3af/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 01:49:16,342 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr6REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 29 more)] === [2022-11-03 01:49:16,343 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 01:49:16,343 INFO L85 PathProgramCache]: Analyzing trace with hash 1285036519, now seen corresponding path program 2 times [2022-11-03 01:49:16,343 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 01:49:16,343 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1257767800] [2022-11-03 01:49:16,343 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 01:49:16,343 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 01:49:16,372 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 01:49:16,656 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-11-03 01:49:16,656 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 01:49:16,657 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1257767800] [2022-11-03 01:49:16,657 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1257767800] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 01:49:16,657 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1638241189] [2022-11-03 01:49:16,657 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-03 01:49:16,657 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 01:49:16,658 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_051627c3-84bf-4ee4-b3b2-b2dd844ae3af/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 01:49:16,659 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_051627c3-84bf-4ee4-b3b2-b2dd844ae3af/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 01:49:16,682 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_051627c3-84bf-4ee4-b3b2-b2dd844ae3af/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-11-03 01:49:16,806 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2022-11-03 01:49:16,807 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 01:49:16,809 INFO L263 TraceCheckSpWp]: Trace formula consists of 231 conjuncts, 14 conjunts are in the unsatisfiable core [2022-11-03 01:49:16,811 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 01:49:16,822 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2022-11-03 01:49:16,852 INFO L356 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2022-11-03 01:49:16,852 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 1 case distinctions, treesize of input 12 treesize of output 14 [2022-11-03 01:49:16,921 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:49:16,922 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 [2022-11-03 01:49:16,945 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-03 01:49:16,947 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 01:49:17,091 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-03 01:49:17,092 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1638241189] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 01:49:17,092 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [506737009] [2022-11-03 01:49:17,094 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2022-11-03 01:49:17,094 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 01:49:17,095 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 01:49:17,095 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 01:49:17,095 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 01:49:17,126 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:49:17,130 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:49:17,131 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 [2022-11-03 01:49:17,168 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:49:17,169 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:49:17,171 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:49:17,173 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:49:17,175 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:49:17,177 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 [2022-11-03 01:49:17,212 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 13 treesize of output 9 [2022-11-03 01:49:17,226 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:49:17,228 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 34 treesize of output 21 [2022-11-03 01:49:17,244 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 13 treesize of output 9 [2022-11-03 01:49:17,280 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:49:17,281 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 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 25 treesize of output 13 [2022-11-03 01:49:17,297 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:49:17,298 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 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 25 treesize of output 13 [2022-11-03 01:49:17,314 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:49:17,315 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:49:17,316 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 26 treesize of output 28 [2022-11-03 01:49:17,360 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-03 01:49:17,361 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 13 [2022-11-03 01:49:17,377 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-03 01:49:17,378 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 13 [2022-11-03 01:49:17,405 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:49:17,407 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:49:17,409 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:49:17,410 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 41 treesize of output 31 [2022-11-03 01:49:17,448 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:49:17,449 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:49:17,451 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:49:17,452 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:49:17,453 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:49:17,455 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:49:17,456 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:49:17,457 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:49:17,459 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:49:17,460 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 13 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 0 case distinctions, treesize of input 34 treesize of output 43 [2022-11-03 01:49:17,637 INFO L356 Elim1Store]: treesize reduction 19, result has 47.2 percent of original size [2022-11-03 01:49:17,638 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 346 treesize of output 353 [2022-11-03 01:49:17,663 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:49:17,667 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:49:17,724 INFO L356 Elim1Store]: treesize reduction 49, result has 25.8 percent of original size [2022-11-03 01:49:17,724 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 3 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 346 treesize of output 338 [2022-11-03 01:49:17,795 INFO L356 Elim1Store]: treesize reduction 19, result has 47.2 percent of original size [2022-11-03 01:49:17,795 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 336 treesize of output 343 [2022-11-03 01:49:18,172 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-03 01:49:18,258 INFO L356 Elim1Store]: treesize reduction 56, result has 29.1 percent of original size [2022-11-03 01:49:18,259 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 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 683 treesize of output 668 [2022-11-03 01:49:18,305 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:49:18,363 INFO L356 Elim1Store]: treesize reduction 37, result has 33.9 percent of original size [2022-11-03 01:49:18,363 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 2 case distinctions, treesize of input 688 treesize of output 689 [2022-11-03 01:49:18,396 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:49:18,448 INFO L356 Elim1Store]: treesize reduction 37, result has 33.9 percent of original size [2022-11-03 01:49:18,449 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 2 case distinctions, treesize of input 682 treesize of output 683 [2022-11-03 01:49:19,118 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:49:19,122 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:49:19,126 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:49:19,129 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-03 01:49:19,140 INFO L356 Elim1Store]: treesize reduction 24, result has 4.0 percent of original size [2022-11-03 01:49:19,141 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 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 5 case distinctions, treesize of input 352 treesize of output 337 [2022-11-03 01:49:19,171 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-03 01:49:19,172 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-03 01:49:19,199 INFO L356 Elim1Store]: treesize reduction 25, result has 21.9 percent of original size [2022-11-03 01:49:19,199 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 2 new quantified variables, introduced 2 case distinctions, treesize of input 348 treesize of output 341 [2022-11-03 01:49:19,227 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-03 01:49:19,228 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-03 01:49:19,247 INFO L356 Elim1Store]: treesize reduction 25, result has 21.9 percent of original size [2022-11-03 01:49:19,248 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 2 new quantified variables, introduced 2 case distinctions, treesize of input 360 treesize of output 353 [2022-11-03 01:49:19,407 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:49:19,483 INFO L356 Elim1Store]: treesize reduction 170, result has 13.7 percent of original size [2022-11-03 01:49:19,484 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 3 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 13 case distinctions, treesize of input 415 treesize of output 419 [2022-11-03 01:49:19,697 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:49:19,699 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:49:19,757 INFO L356 Elim1Store]: treesize reduction 49, result has 25.8 percent of original size [2022-11-03 01:49:19,758 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 3 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 352 treesize of output 344 [2022-11-03 01:49:19,828 INFO L356 Elim1Store]: treesize reduction 19, result has 47.2 percent of original size [2022-11-03 01:49:19,829 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 342 treesize of output 349 [2022-11-03 01:49:19,888 INFO L356 Elim1Store]: treesize reduction 19, result has 47.2 percent of original size [2022-11-03 01:49:19,889 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 336 treesize of output 343 [2022-11-03 01:49:20,256 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-03 01:49:20,333 INFO L356 Elim1Store]: treesize reduction 56, result has 29.1 percent of original size [2022-11-03 01:49:20,333 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 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 683 treesize of output 668 [2022-11-03 01:49:20,375 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:49:20,435 INFO L356 Elim1Store]: treesize reduction 37, result has 33.9 percent of original size [2022-11-03 01:49:20,436 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 2 case distinctions, treesize of input 688 treesize of output 689 [2022-11-03 01:49:20,475 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:49:20,589 INFO L356 Elim1Store]: treesize reduction 37, result has 33.9 percent of original size [2022-11-03 01:49:20,590 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 2 case distinctions, treesize of input 682 treesize of output 683 [2022-11-03 01:49:21,354 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:49:21,356 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:49:21,358 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:49:21,360 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:49:21,361 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-03 01:49:21,361 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-03 01:49:21,372 INFO L356 Elim1Store]: treesize reduction 24, result has 4.0 percent of original size [2022-11-03 01:49:21,373 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 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 5 case distinctions, treesize of input 387 treesize of output 372 [2022-11-03 01:49:21,404 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-03 01:49:21,406 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-03 01:49:21,427 INFO L356 Elim1Store]: treesize reduction 27, result has 25.0 percent of original size [2022-11-03 01:49:21,428 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 2 new quantified variables, introduced 2 case distinctions, treesize of input 383 treesize of output 376 [2022-11-03 01:49:21,457 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-03 01:49:21,458 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-03 01:49:21,481 INFO L356 Elim1Store]: treesize reduction 33, result has 31.3 percent of original size [2022-11-03 01:49:21,481 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 2 new quantified variables, introduced 2 case distinctions, treesize of input 437 treesize of output 430 [2022-11-03 01:49:21,697 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 [2022-11-03 01:49:21,712 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 [2022-11-03 01:49:21,718 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 01:49:25,573 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1239#(and (= |ULTIMATE.start_sll_remove_last_~head#1.base| |ULTIMATE.start_sll_remove_last_#in~head#1.base|) (= |ULTIMATE.start_sll_create_~head~0#1.base| |ULTIMATE.start_sll_create_#res#1.base|) (= |ULTIMATE.start_sll_remove_last_#in~head#1.offset| |ULTIMATE.start_main_~#s~0#1.offset|) (= (select (select |#memory_$Pointer$.offset| |ULTIMATE.start_main_~#s~0#1.base|) |ULTIMATE.start_main_~#s~0#1.offset|) |ULTIMATE.start_sll_create_#res#1.offset|) (<= 1 |ULTIMATE.start_sll_create_#in~data#1|) (<= |ULTIMATE.start_sll_create_#in~data#1| 1) (<= |ULTIMATE.start_sll_create_~head~0#1.offset| 0) (<= |ULTIMATE.start_sll_create_~len#1| 0) (<= |#NULL.offset| 0) (= |ULTIMATE.start_sll_remove_last_#in~head#1.offset| |ULTIMATE.start_sll_remove_last_~head#1.offset|) (<= 1 |ULTIMATE.start_sll_create_~data#1|) (not (= (select |#valid| |ULTIMATE.start_sll_remove_last_~head#1.base|) 1)) (= |ULTIMATE.start_main_~data~0#1| 1) (<= |ULTIMATE.start_sll_create_~data#1| 1) (<= |ULTIMATE.start_sll_create_#in~len#1| 2) (<= 0 |ULTIMATE.start_sll_create_~len#1|) (= |ULTIMATE.start_main_~len~0#1| 2) (= |ULTIMATE.start_sll_create_#res#1.offset| |ULTIMATE.start_sll_create_~head~0#1.offset|) (<= |ULTIMATE.start_main_~#s~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~#s~0#1.base|) (= |ULTIMATE.start_sll_remove_last_#in~head#1.base| |ULTIMATE.start_main_~#s~0#1.base|) (<= 0 |#NULL.offset|) (= (select (select |#memory_$Pointer$.base| |ULTIMATE.start_main_~#s~0#1.base|) |ULTIMATE.start_main_~#s~0#1.offset|) |ULTIMATE.start_sll_create_#res#1.base|) (<= 0 |#StackHeapBarrier|) (<= 2 |ULTIMATE.start_sll_create_#in~len#1|) (= |ULTIMATE.start_main_~len~0#1| (+ |ULTIMATE.start_main_~i~0#1| 1)) (<= 0 |ULTIMATE.start_main_~#s~0#1.offset|) (<= 0 |ULTIMATE.start_sll_create_~head~0#1.offset|) (= |#NULL.base| 0))' at error location [2022-11-03 01:49:25,573 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 01:49:25,573 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 01:49:25,573 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 3, 3] total 7 [2022-11-03 01:49:25,573 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [424982471] [2022-11-03 01:49:25,574 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 01:49:25,574 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2022-11-03 01:49:25,574 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 01:49:25,574 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2022-11-03 01:49:25,575 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=75, Invalid=197, Unknown=0, NotChecked=0, Total=272 [2022-11-03 01:49:25,575 INFO L87 Difference]: Start difference. First operand 61 states and 64 transitions. Second operand has 9 states, 8 states have (on average 3.875) internal successors, (31), 8 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) [2022-11-03 01:49:25,837 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 01:49:25,838 INFO L93 Difference]: Finished difference Result 99 states and 105 transitions. [2022-11-03 01:49:25,838 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2022-11-03 01:49:25,838 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 8 states have (on average 3.875) internal successors, (31), 8 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) Word has length 14 [2022-11-03 01:49:25,838 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 01:49:25,839 INFO L225 Difference]: With dead ends: 99 [2022-11-03 01:49:25,839 INFO L226 Difference]: Without dead ends: 99 [2022-11-03 01:49:25,840 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 30 SyntacticMatches, 2 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 103 ImplicationChecksByTransitivity, 4.0s TimeCoverageRelationStatistics Valid=103, Invalid=277, Unknown=0, NotChecked=0, Total=380 [2022-11-03 01:49:25,841 INFO L413 NwaCegarLoop]: 21 mSDtfsCounter, 145 mSDsluCounter, 103 mSDsCounter, 0 mSdLazyCounter, 172 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 145 SdHoareTripleChecker+Valid, 112 SdHoareTripleChecker+Invalid, 216 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 172 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 33 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-03 01:49:25,841 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [145 Valid, 112 Invalid, 216 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 172 Invalid, 0 Unknown, 33 Unchecked, 0.2s Time] [2022-11-03 01:49:25,842 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 99 states. [2022-11-03 01:49:25,845 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 99 to 60. [2022-11-03 01:49:25,845 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 60 states, 36 states have (on average 1.7777777777777777) internal successors, (64), 59 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) [2022-11-03 01:49:25,846 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 64 transitions. [2022-11-03 01:49:25,846 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 64 transitions. Word has length 14 [2022-11-03 01:49:25,847 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 01:49:25,847 INFO L495 AbstractCegarLoop]: Abstraction has 60 states and 64 transitions. [2022-11-03 01:49:25,847 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 8 states have (on average 3.875) internal successors, (31), 8 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) [2022-11-03 01:49:25,847 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 64 transitions. [2022-11-03 01:49:25,848 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2022-11-03 01:49:25,848 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 01:49:25,848 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1] [2022-11-03 01:49:25,889 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_051627c3-84bf-4ee4-b3b2-b2dd844ae3af/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2022-11-03 01:49:26,070 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_051627c3-84bf-4ee4-b3b2-b2dd844ae3af/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable7 [2022-11-03 01:49:26,070 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr7REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 29 more)] === [2022-11-03 01:49:26,071 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 01:49:26,071 INFO L85 PathProgramCache]: Analyzing trace with hash 1285036520, now seen corresponding path program 1 times [2022-11-03 01:49:26,071 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 01:49:26,071 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1026886991] [2022-11-03 01:49:26,071 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 01:49:26,071 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 01:49:26,114 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 01:49:26,520 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 01:49:26,520 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 01:49:26,521 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1026886991] [2022-11-03 01:49:26,521 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1026886991] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 01:49:26,521 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1573555331] [2022-11-03 01:49:26,521 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 01:49:26,521 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 01:49:26,522 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_051627c3-84bf-4ee4-b3b2-b2dd844ae3af/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 01:49:26,523 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_051627c3-84bf-4ee4-b3b2-b2dd844ae3af/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 01:49:26,554 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_051627c3-84bf-4ee4-b3b2-b2dd844ae3af/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2022-11-03 01:49:26,659 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 01:49:26,660 INFO L263 TraceCheckSpWp]: Trace formula consists of 231 conjuncts, 18 conjunts are in the unsatisfiable core [2022-11-03 01:49:26,665 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 01:49:26,674 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2022-11-03 01:49:26,701 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:49:26,702 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 [2022-11-03 01:49:26,743 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:49:26,743 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 [2022-11-03 01:49:26,805 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-03 01:49:26,805 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 01:49:31,151 WARN L833 $PredicateComparison]: unable to prove that (and (forall ((|v_ULTIMATE.start_node_create_~temp~0#1.base_27| Int)) (or (not (< |v_ULTIMATE.start_node_create_~temp~0#1.base_27| |c_#StackHeapBarrier|)) (forall ((|v_ULTIMATE.start_node_create_~temp~0#1.base_26| Int) (v_ArrVal_303 Int)) (or (forall ((v_ArrVal_304 Int)) (<= (+ |c_ULTIMATE.start_main_~#s~0#1.offset| 4) (select (store (store |c_#length| |v_ULTIMATE.start_node_create_~temp~0#1.base_27| v_ArrVal_303) |v_ULTIMATE.start_node_create_~temp~0#1.base_26| v_ArrVal_304) |c_ULTIMATE.start_main_~#s~0#1.base|))) (not (< |v_ULTIMATE.start_node_create_~temp~0#1.base_26| |c_#StackHeapBarrier|)))))) (<= 0 |c_ULTIMATE.start_main_~#s~0#1.offset|)) is different from false [2022-11-03 01:49:31,152 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 2 not checked. [2022-11-03 01:49:31,153 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1573555331] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 01:49:31,153 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [11168437] [2022-11-03 01:49:31,155 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2022-11-03 01:49:31,155 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 01:49:31,155 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 01:49:31,156 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 01:49:31,156 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 01:49:31,181 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:49:31,183 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:49:31,184 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 [2022-11-03 01:49:31,212 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:49:31,214 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:49:31,215 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:49:31,217 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:49:31,219 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:49:31,220 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 [2022-11-03 01:49:31,260 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:49:31,261 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 34 treesize of output 21 [2022-11-03 01:49:31,279 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 13 treesize of output 9 [2022-11-03 01:49:31,291 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 13 treesize of output 9 [2022-11-03 01:49:31,323 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:49:31,324 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 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 25 treesize of output 13 [2022-11-03 01:49:31,341 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:49:31,343 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:49:31,344 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 26 treesize of output 28 [2022-11-03 01:49:31,362 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:49:31,363 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 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 25 treesize of output 13 [2022-11-03 01:49:31,403 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-03 01:49:31,404 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 13 [2022-11-03 01:49:31,419 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-03 01:49:31,420 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 13 [2022-11-03 01:49:31,444 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:49:31,446 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:49:31,448 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:49:31,449 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 41 treesize of output 31 [2022-11-03 01:49:31,499 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:49:31,500 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:49:31,502 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:49:31,503 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:49:31,505 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:49:31,506 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:49:31,508 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:49:31,510 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:49:31,512 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:49:31,513 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 13 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 0 case distinctions, treesize of input 34 treesize of output 43 [2022-11-03 01:49:31,625 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:49:31,627 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:49:31,637 INFO L356 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2022-11-03 01:49:31,637 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 3 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 345 treesize of output 327 [2022-11-03 01:49:31,694 INFO L356 Elim1Store]: treesize reduction 19, result has 47.2 percent of original size [2022-11-03 01:49:31,695 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 339 treesize of output 346 [2022-11-03 01:49:31,753 INFO L356 Elim1Store]: treesize reduction 19, result has 47.2 percent of original size [2022-11-03 01:49:31,753 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 333 treesize of output 340 [2022-11-03 01:49:32,095 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-03 01:49:32,148 INFO L356 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-11-03 01:49:32,148 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 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 659 treesize of output 640 [2022-11-03 01:49:32,192 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:49:32,237 INFO L356 Elim1Store]: treesize reduction 37, result has 33.9 percent of original size [2022-11-03 01:49:32,242 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 2 case distinctions, treesize of input 664 treesize of output 665 [2022-11-03 01:49:32,266 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:49:32,318 INFO L356 Elim1Store]: treesize reduction 37, result has 33.9 percent of original size [2022-11-03 01:49:32,319 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 2 case distinctions, treesize of input 658 treesize of output 659 [2022-11-03 01:49:32,910 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:49:32,914 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:49:32,916 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:49:32,917 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-03 01:49:32,928 INFO L356 Elim1Store]: treesize reduction 24, result has 4.0 percent of original size [2022-11-03 01:49:32,929 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 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 5 case distinctions, treesize of input 352 treesize of output 337 [2022-11-03 01:49:32,959 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-03 01:49:32,961 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-03 01:49:32,982 INFO L356 Elim1Store]: treesize reduction 25, result has 21.9 percent of original size [2022-11-03 01:49:32,983 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 2 new quantified variables, introduced 2 case distinctions, treesize of input 348 treesize of output 341 [2022-11-03 01:49:33,023 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-03 01:49:33,024 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-03 01:49:33,046 INFO L356 Elim1Store]: treesize reduction 25, result has 21.9 percent of original size [2022-11-03 01:49:33,047 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 2 new quantified variables, introduced 2 case distinctions, treesize of input 360 treesize of output 353 [2022-11-03 01:49:33,219 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:49:33,291 INFO L356 Elim1Store]: treesize reduction 170, result has 13.7 percent of original size [2022-11-03 01:49:33,291 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 3 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 13 case distinctions, treesize of input 415 treesize of output 419 [2022-11-03 01:49:33,548 INFO L356 Elim1Store]: treesize reduction 19, result has 47.2 percent of original size [2022-11-03 01:49:33,549 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 339 treesize of output 346 [2022-11-03 01:49:33,607 INFO L356 Elim1Store]: treesize reduction 19, result has 47.2 percent of original size [2022-11-03 01:49:33,607 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 333 treesize of output 340 [2022-11-03 01:49:33,652 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:49:33,654 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:49:33,665 INFO L356 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2022-11-03 01:49:33,665 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 3 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 333 treesize of output 315 [2022-11-03 01:49:34,084 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:49:34,134 INFO L356 Elim1Store]: treesize reduction 37, result has 33.9 percent of original size [2022-11-03 01:49:34,134 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 2 case distinctions, treesize of input 853 treesize of output 848 [2022-11-03 01:49:34,166 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-03 01:49:34,214 INFO L356 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-11-03 01:49:34,216 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 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 828 treesize of output 797 [2022-11-03 01:49:34,262 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:49:34,312 INFO L356 Elim1Store]: treesize reduction 37, result has 33.9 percent of original size [2022-11-03 01:49:34,312 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 2 case distinctions, treesize of input 829 treesize of output 830 [2022-11-03 01:49:34,807 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-03 01:49:34,811 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-03 01:49:34,835 INFO L356 Elim1Store]: treesize reduction 27, result has 25.0 percent of original size [2022-11-03 01:49:34,836 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 2 new quantified variables, introduced 2 case distinctions, treesize of input 379 treesize of output 372 [2022-11-03 01:49:34,861 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:49:34,863 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:49:34,864 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:49:34,865 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-03 01:49:34,876 INFO L356 Elim1Store]: treesize reduction 36, result has 2.7 percent of original size [2022-11-03 01:49:34,876 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 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 5 case distinctions, treesize of input 467 treesize of output 452 [2022-11-03 01:49:34,906 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-03 01:49:34,907 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-03 01:49:34,933 INFO L356 Elim1Store]: treesize reduction 51, result has 22.7 percent of original size [2022-11-03 01:49:34,934 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 2 new quantified variables, introduced 2 case distinctions, treesize of input 463 treesize of output 456 [2022-11-03 01:49:35,142 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 [2022-11-03 01:49:35,154 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 [2022-11-03 01:49:35,157 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 01:49:39,228 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1505#(and (= |ULTIMATE.start_sll_remove_last_~head#1.base| |ULTIMATE.start_sll_remove_last_#in~head#1.base|) (= |ULTIMATE.start_sll_create_~head~0#1.base| |ULTIMATE.start_sll_create_#res#1.base|) (= |ULTIMATE.start_sll_remove_last_#in~head#1.offset| |ULTIMATE.start_main_~#s~0#1.offset|) (= (select (select |#memory_$Pointer$.offset| |ULTIMATE.start_main_~#s~0#1.base|) |ULTIMATE.start_main_~#s~0#1.offset|) |ULTIMATE.start_sll_create_#res#1.offset|) (<= 1 |ULTIMATE.start_sll_create_#in~data#1|) (<= |ULTIMATE.start_sll_create_#in~data#1| 1) (<= |ULTIMATE.start_sll_create_~head~0#1.offset| 0) (<= |ULTIMATE.start_sll_create_~len#1| 0) (not (<= (+ |ULTIMATE.start_sll_remove_last_~head#1.offset| 4) (select |#length| |ULTIMATE.start_sll_remove_last_~head#1.base|))) (<= |#NULL.offset| 0) (= |ULTIMATE.start_sll_remove_last_#in~head#1.offset| |ULTIMATE.start_sll_remove_last_~head#1.offset|) (<= 1 |ULTIMATE.start_sll_create_~data#1|) (= |ULTIMATE.start_main_~data~0#1| 1) (<= |ULTIMATE.start_sll_create_~data#1| 1) (<= |ULTIMATE.start_sll_create_#in~len#1| 2) (<= 0 |ULTIMATE.start_sll_create_~len#1|) (= |ULTIMATE.start_main_~len~0#1| 2) (= |ULTIMATE.start_sll_create_#res#1.offset| |ULTIMATE.start_sll_create_~head~0#1.offset|) (<= |ULTIMATE.start_main_~#s~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~#s~0#1.base|) (= |ULTIMATE.start_sll_remove_last_#in~head#1.base| |ULTIMATE.start_main_~#s~0#1.base|) (<= 0 |#NULL.offset|) (= (select (select |#memory_$Pointer$.base| |ULTIMATE.start_main_~#s~0#1.base|) |ULTIMATE.start_main_~#s~0#1.offset|) |ULTIMATE.start_sll_create_#res#1.base|) (<= 0 |#StackHeapBarrier|) (<= 2 |ULTIMATE.start_sll_create_#in~len#1|) (= |ULTIMATE.start_main_~len~0#1| (+ |ULTIMATE.start_main_~i~0#1| 1)) (<= 0 |ULTIMATE.start_main_~#s~0#1.offset|) (<= 0 |ULTIMATE.start_sll_create_~head~0#1.offset|) (= |#NULL.base| 0))' at error location [2022-11-03 01:49:39,229 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 01:49:39,229 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 01:49:39,229 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 3, 4] total 13 [2022-11-03 01:49:39,229 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1549738288] [2022-11-03 01:49:39,230 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 01:49:39,230 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2022-11-03 01:49:39,230 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 01:49:39,231 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2022-11-03 01:49:39,231 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=111, Invalid=354, Unknown=1, NotChecked=40, Total=506 [2022-11-03 01:49:39,231 INFO L87 Difference]: Start difference. First operand 60 states and 64 transitions. Second operand has 15 states, 14 states have (on average 3.0) internal successors, (42), 14 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) [2022-11-03 01:49:39,388 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 01:49:39,388 INFO L93 Difference]: Finished difference Result 55 states and 58 transitions. [2022-11-03 01:49:39,389 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-11-03 01:49:39,389 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 14 states have (on average 3.0) internal successors, (42), 14 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 14 [2022-11-03 01:49:39,389 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 01:49:39,389 INFO L225 Difference]: With dead ends: 55 [2022-11-03 01:49:39,390 INFO L226 Difference]: Without dead ends: 55 [2022-11-03 01:49:39,390 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 25 SyntacticMatches, 1 SemanticMatches, 23 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 151 ImplicationChecksByTransitivity, 8.4s TimeCoverageRelationStatistics Valid=140, Invalid=415, Unknown=1, NotChecked=44, Total=600 [2022-11-03 01:49:39,391 INFO L413 NwaCegarLoop]: 19 mSDtfsCounter, 260 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 45 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 260 SdHoareTripleChecker+Valid, 23 SdHoareTripleChecker+Invalid, 107 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 45 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 53 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-03 01:49:39,391 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [260 Valid, 23 Invalid, 107 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 45 Invalid, 0 Unknown, 53 Unchecked, 0.1s Time] [2022-11-03 01:49:39,392 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2022-11-03 01:49:39,395 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 55. [2022-11-03 01:49:39,395 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 55 states, 36 states have (on average 1.6111111111111112) internal successors, (58), 54 states have internal predecessors, (58), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 01:49:39,396 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 58 transitions. [2022-11-03 01:49:39,396 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 58 transitions. Word has length 14 [2022-11-03 01:49:39,396 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 01:49:39,396 INFO L495 AbstractCegarLoop]: Abstraction has 55 states and 58 transitions. [2022-11-03 01:49:39,396 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 14 states have (on average 3.0) internal successors, (42), 14 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) [2022-11-03 01:49:39,397 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 58 transitions. [2022-11-03 01:49:39,397 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2022-11-03 01:49:39,397 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 01:49:39,397 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1] [2022-11-03 01:49:39,443 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_051627c3-84bf-4ee4-b3b2-b2dd844ae3af/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2022-11-03 01:49:39,598 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_051627c3-84bf-4ee4-b3b2-b2dd844ae3af/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 01:49:39,598 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr8REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 29 more)] === [2022-11-03 01:49:39,598 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 01:49:39,599 INFO L85 PathProgramCache]: Analyzing trace with hash 1181426445, now seen corresponding path program 1 times [2022-11-03 01:49:39,599 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 01:49:39,599 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1240844244] [2022-11-03 01:49:39,599 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 01:49:39,599 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 01:49:39,621 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 01:49:39,808 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2022-11-03 01:49:39,809 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 01:49:39,809 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1240844244] [2022-11-03 01:49:39,809 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1240844244] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-03 01:49:39,809 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-03 01:49:39,810 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-11-03 01:49:39,810 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [717823251] [2022-11-03 01:49:39,810 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-03 01:49:39,810 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-11-03 01:49:39,811 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 01:49:39,811 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-11-03 01:49:39,811 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2022-11-03 01:49:39,812 INFO L87 Difference]: Start difference. First operand 55 states and 58 transitions. Second operand has 6 states, 5 states have (on average 2.2) internal successors, (11), 6 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 01:49:40,015 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 01:49:40,015 INFO L93 Difference]: Finished difference Result 82 states and 87 transitions. [2022-11-03 01:49:40,015 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2022-11-03 01:49:40,015 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 2.2) internal successors, (11), 6 states have internal predecessors, (11), 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 [2022-11-03 01:49:40,016 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 01:49:40,016 INFO L225 Difference]: With dead ends: 82 [2022-11-03 01:49:40,016 INFO L226 Difference]: Without dead ends: 82 [2022-11-03 01:49:40,017 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 [2022-11-03 01:49:40,017 INFO L413 NwaCegarLoop]: 29 mSDtfsCounter, 79 mSDsluCounter, 85 mSDsCounter, 0 mSdLazyCounter, 160 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 79 SdHoareTripleChecker+Valid, 106 SdHoareTripleChecker+Invalid, 163 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 160 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-03 01:49:40,018 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [79 Valid, 106 Invalid, 163 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 160 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-03 01:49:40,019 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2022-11-03 01:49:40,021 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 56. [2022-11-03 01:49:40,022 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 56 states, 37 states have (on average 1.6216216216216217) 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) [2022-11-03 01:49:40,022 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 60 transitions. [2022-11-03 01:49:40,022 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 60 transitions. Word has length 15 [2022-11-03 01:49:40,022 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 01:49:40,023 INFO L495 AbstractCegarLoop]: Abstraction has 56 states and 60 transitions. [2022-11-03 01:49:40,023 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 2.2) internal successors, (11), 6 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 01:49:40,023 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 60 transitions. [2022-11-03 01:49:40,023 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2022-11-03 01:49:40,023 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 01:49:40,023 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1] [2022-11-03 01:49:40,023 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2022-11-03 01:49:40,024 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 29 more)] === [2022-11-03 01:49:40,024 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 01:49:40,024 INFO L85 PathProgramCache]: Analyzing trace with hash 1181426446, now seen corresponding path program 1 times [2022-11-03 01:49:40,024 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 01:49:40,024 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1517189707] [2022-11-03 01:49:40,024 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 01:49:40,025 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 01:49:40,058 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 01:49:40,487 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-03 01:49:40,488 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 01:49:40,488 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1517189707] [2022-11-03 01:49:40,488 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1517189707] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-03 01:49:40,488 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-03 01:49:40,488 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2022-11-03 01:49:40,489 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1360317554] [2022-11-03 01:49:40,489 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-03 01:49:40,489 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2022-11-03 01:49:40,489 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 01:49:40,490 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2022-11-03 01:49:40,492 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2022-11-03 01:49:40,492 INFO L87 Difference]: Start difference. First operand 56 states and 60 transitions. Second operand has 8 states, 7 states have (on average 2.142857142857143) internal successors, (15), 8 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) [2022-11-03 01:49:40,777 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 01:49:40,777 INFO L93 Difference]: Finished difference Result 77 states and 82 transitions. [2022-11-03 01:49:40,777 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2022-11-03 01:49:40,778 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 2.142857142857143) internal successors, (15), 8 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 15 [2022-11-03 01:49:40,778 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 01:49:40,779 INFO L225 Difference]: With dead ends: 77 [2022-11-03 01:49:40,779 INFO L226 Difference]: Without dead ends: 77 [2022-11-03 01:49:40,780 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=53, Invalid=103, Unknown=0, NotChecked=0, Total=156 [2022-11-03 01:49:40,781 INFO L413 NwaCegarLoop]: 27 mSDtfsCounter, 259 mSDsluCounter, 79 mSDsCounter, 0 mSdLazyCounter, 129 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 259 SdHoareTripleChecker+Valid, 100 SdHoareTripleChecker+Invalid, 138 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 129 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-03 01:49:40,782 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [259 Valid, 100 Invalid, 138 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 129 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-03 01:49:40,783 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 77 states. [2022-11-03 01:49:40,791 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 77 to 56. [2022-11-03 01:49:40,791 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 56 states, 37 states have (on average 1.5945945945945945) internal successors, (59), 55 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) [2022-11-03 01:49:40,793 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 59 transitions. [2022-11-03 01:49:40,793 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 59 transitions. Word has length 15 [2022-11-03 01:49:40,794 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 01:49:40,794 INFO L495 AbstractCegarLoop]: Abstraction has 56 states and 59 transitions. [2022-11-03 01:49:40,794 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 2.142857142857143) internal successors, (15), 8 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) [2022-11-03 01:49:40,794 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 59 transitions. [2022-11-03 01:49:40,795 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2022-11-03 01:49:40,795 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 01:49:40,796 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 01:49:40,796 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2022-11-03 01:49:40,796 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr20REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 29 more)] === [2022-11-03 01:49:40,797 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 01:49:40,797 INFO L85 PathProgramCache]: Analyzing trace with hash -1381727097, now seen corresponding path program 1 times [2022-11-03 01:49:40,797 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 01:49:40,797 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [449044240] [2022-11-03 01:49:40,797 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 01:49:40,798 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 01:49:40,837 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 01:49:41,176 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-03 01:49:41,177 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 01:49:41,177 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [449044240] [2022-11-03 01:49:41,177 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [449044240] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-03 01:49:41,177 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-03 01:49:41,177 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2022-11-03 01:49:41,180 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [852413149] [2022-11-03 01:49:41,181 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-03 01:49:41,181 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2022-11-03 01:49:41,181 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 01:49:41,182 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2022-11-03 01:49:41,182 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2022-11-03 01:49:41,182 INFO L87 Difference]: Start difference. First operand 56 states and 59 transitions. Second operand has 8 states, 7 states have (on average 2.5714285714285716) internal successors, (18), 8 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 01:49:41,544 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 01:49:41,545 INFO L93 Difference]: Finished difference Result 99 states and 105 transitions. [2022-11-03 01:49:41,545 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2022-11-03 01:49:41,545 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 2.5714285714285716) internal successors, (18), 8 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 18 [2022-11-03 01:49:41,545 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 01:49:41,546 INFO L225 Difference]: With dead ends: 99 [2022-11-03 01:49:41,546 INFO L226 Difference]: Without dead ends: 99 [2022-11-03 01:49:41,547 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=62, Invalid=120, Unknown=0, NotChecked=0, Total=182 [2022-11-03 01:49:41,547 INFO L413 NwaCegarLoop]: 25 mSDtfsCounter, 325 mSDsluCounter, 75 mSDsCounter, 0 mSdLazyCounter, 167 mSolverCounterSat, 20 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 325 SdHoareTripleChecker+Valid, 90 SdHoareTripleChecker+Invalid, 187 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 20 IncrementalHoareTripleChecker+Valid, 167 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-03 01:49:41,548 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [325 Valid, 90 Invalid, 187 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [20 Valid, 167 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-03 01:49:41,549 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 99 states. [2022-11-03 01:49:41,551 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 99 to 63. [2022-11-03 01:49:41,551 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 63 states, 44 states have (on average 1.6363636363636365) internal successors, (72), 62 states have internal predecessors, (72), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 01:49:41,552 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 72 transitions. [2022-11-03 01:49:41,552 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 72 transitions. Word has length 18 [2022-11-03 01:49:41,552 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 01:49:41,552 INFO L495 AbstractCegarLoop]: Abstraction has 63 states and 72 transitions. [2022-11-03 01:49:41,553 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 2.5714285714285716) internal successors, (18), 8 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 01:49:41,553 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 72 transitions. [2022-11-03 01:49:41,553 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2022-11-03 01:49:41,554 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 01:49:41,554 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 01:49:41,554 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2022-11-03 01:49:41,554 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr19REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 29 more)] === [2022-11-03 01:49:41,555 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 01:49:41,555 INFO L85 PathProgramCache]: Analyzing trace with hash -1381727098, now seen corresponding path program 1 times [2022-11-03 01:49:41,555 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 01:49:41,555 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [406383162] [2022-11-03 01:49:41,556 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 01:49:41,556 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 01:49:41,575 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 01:49:41,644 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2022-11-03 01:49:41,645 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 01:49:41,645 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [406383162] [2022-11-03 01:49:41,645 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [406383162] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-03 01:49:41,645 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-03 01:49:41,645 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-11-03 01:49:41,646 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [29315360] [2022-11-03 01:49:41,646 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-03 01:49:41,646 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-11-03 01:49:41,646 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 01:49:41,647 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-11-03 01:49:41,647 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-11-03 01:49:41,647 INFO L87 Difference]: Start difference. First operand 63 states and 72 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) [2022-11-03 01:49:41,781 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 01:49:41,781 INFO L93 Difference]: Finished difference Result 63 states and 70 transitions. [2022-11-03 01:49:41,781 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2022-11-03 01:49:41,782 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 18 [2022-11-03 01:49:41,782 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 01:49:41,782 INFO L225 Difference]: With dead ends: 63 [2022-11-03 01:49:41,783 INFO L226 Difference]: Without dead ends: 63 [2022-11-03 01:49:41,783 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2022-11-03 01:49:41,785 INFO L413 NwaCegarLoop]: 25 mSDtfsCounter, 31 mSDsluCounter, 38 mSDsCounter, 0 mSdLazyCounter, 104 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 31 SdHoareTripleChecker+Valid, 55 SdHoareTripleChecker+Invalid, 109 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 104 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-03 01:49:41,786 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [31 Valid, 55 Invalid, 109 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 104 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-03 01:49:41,787 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2022-11-03 01:49:41,789 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 62. [2022-11-03 01:49:41,789 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 62 states, 45 states have (on average 1.5555555555555556) internal successors, (70), 61 states have internal predecessors, (70), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 01:49:41,790 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 70 transitions. [2022-11-03 01:49:41,790 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 70 transitions. Word has length 18 [2022-11-03 01:49:41,792 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 01:49:41,792 INFO L495 AbstractCegarLoop]: Abstraction has 62 states and 70 transitions. [2022-11-03 01:49:41,793 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) [2022-11-03 01:49:41,793 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 70 transitions. [2022-11-03 01:49:41,794 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2022-11-03 01:49:41,794 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 01:49:41,794 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 01:49:41,795 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2022-11-03 01:49:41,795 INFO L420 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr12ASSERT_VIOLATIONMEMORY_FREE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 29 more)] === [2022-11-03 01:49:41,796 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 01:49:41,796 INFO L85 PathProgramCache]: Analyzing trace with hash -1381742866, now seen corresponding path program 1 times [2022-11-03 01:49:41,796 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 01:49:41,796 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [649626775] [2022-11-03 01:49:41,796 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 01:49:41,797 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 01:49:41,816 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 01:49:41,993 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-03 01:49:41,993 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 01:49:41,993 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [649626775] [2022-11-03 01:49:41,993 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [649626775] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-03 01:49:41,994 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-03 01:49:41,994 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2022-11-03 01:49:41,994 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [854537763] [2022-11-03 01:49:41,995 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-03 01:49:41,995 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2022-11-03 01:49:41,995 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 01:49:41,996 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2022-11-03 01:49:41,996 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2022-11-03 01:49:41,996 INFO L87 Difference]: Start difference. First operand 62 states and 70 transitions. Second operand has 8 states, 7 states have (on average 2.5714285714285716) internal successors, (18), 8 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 01:49:42,171 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 01:49:42,171 INFO L93 Difference]: Finished difference Result 61 states and 69 transitions. [2022-11-03 01:49:42,171 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2022-11-03 01:49:42,171 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 2.5714285714285716) internal successors, (18), 8 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 18 [2022-11-03 01:49:42,171 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 01:49:42,172 INFO L225 Difference]: With dead ends: 61 [2022-11-03 01:49:42,172 INFO L226 Difference]: Without dead ends: 61 [2022-11-03 01:49:42,172 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=63, Invalid=119, Unknown=0, NotChecked=0, Total=182 [2022-11-03 01:49:42,173 INFO L413 NwaCegarLoop]: 25 mSDtfsCounter, 195 mSDsluCounter, 32 mSDsCounter, 0 mSdLazyCounter, 75 mSolverCounterSat, 17 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 195 SdHoareTripleChecker+Valid, 52 SdHoareTripleChecker+Invalid, 92 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 17 IncrementalHoareTripleChecker+Valid, 75 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-03 01:49:42,173 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [195 Valid, 52 Invalid, 92 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [17 Valid, 75 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-03 01:49:42,174 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2022-11-03 01:49:42,175 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 61. [2022-11-03 01:49:42,176 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 61 states, 45 states have (on average 1.5333333333333334) internal successors, (69), 60 states have internal predecessors, (69), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 01:49:42,176 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 69 transitions. [2022-11-03 01:49:42,176 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 69 transitions. Word has length 18 [2022-11-03 01:49:42,176 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 01:49:42,177 INFO L495 AbstractCegarLoop]: Abstraction has 61 states and 69 transitions. [2022-11-03 01:49:42,177 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 2.5714285714285716) internal successors, (18), 8 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 01:49:42,177 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 69 transitions. [2022-11-03 01:49:42,177 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2022-11-03 01:49:42,177 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 01:49:42,177 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 01:49:42,178 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2022-11-03 01:49:42,178 INFO L420 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr13ASSERT_VIOLATIONMEMORY_FREE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 29 more)] === [2022-11-03 01:49:42,178 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 01:49:42,178 INFO L85 PathProgramCache]: Analyzing trace with hash 115644206, now seen corresponding path program 1 times [2022-11-03 01:49:42,178 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 01:49:42,179 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1440811784] [2022-11-03 01:49:42,179 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 01:49:42,179 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 01:49:42,218 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 01:49:42,431 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-03 01:49:42,431 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 01:49:42,432 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1440811784] [2022-11-03 01:49:42,432 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1440811784] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-03 01:49:42,432 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-03 01:49:42,432 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2022-11-03 01:49:42,432 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [965943415] [2022-11-03 01:49:42,433 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-03 01:49:42,433 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2022-11-03 01:49:42,433 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 01:49:42,434 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2022-11-03 01:49:42,434 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2022-11-03 01:49:42,434 INFO L87 Difference]: Start difference. First operand 61 states and 69 transitions. Second operand has 8 states, 7 states have (on average 2.7142857142857144) internal successors, (19), 8 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 01:49:42,693 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 01:49:42,693 INFO L93 Difference]: Finished difference Result 77 states and 86 transitions. [2022-11-03 01:49:42,693 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2022-11-03 01:49:42,694 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 2.7142857142857144) internal successors, (19), 8 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 19 [2022-11-03 01:49:42,694 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 01:49:42,694 INFO L225 Difference]: With dead ends: 77 [2022-11-03 01:49:42,694 INFO L226 Difference]: Without dead ends: 77 [2022-11-03 01:49:42,695 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=62, Invalid=120, Unknown=0, NotChecked=0, Total=182 [2022-11-03 01:49:42,695 INFO L413 NwaCegarLoop]: 22 mSDtfsCounter, 226 mSDsluCounter, 68 mSDsCounter, 0 mSdLazyCounter, 122 mSolverCounterSat, 19 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 226 SdHoareTripleChecker+Valid, 84 SdHoareTripleChecker+Invalid, 141 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 19 IncrementalHoareTripleChecker+Valid, 122 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-03 01:49:42,696 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [226 Valid, 84 Invalid, 141 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [19 Valid, 122 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-03 01:49:42,696 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 77 states. [2022-11-03 01:49:42,698 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 77 to 64. [2022-11-03 01:49:42,698 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 64 states, 48 states have (on average 1.5) internal successors, (72), 63 states have internal predecessors, (72), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 01:49:42,698 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 72 transitions. [2022-11-03 01:49:42,699 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 72 transitions. Word has length 19 [2022-11-03 01:49:42,699 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 01:49:42,699 INFO L495 AbstractCegarLoop]: Abstraction has 64 states and 72 transitions. [2022-11-03 01:49:42,699 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 2.7142857142857144) internal successors, (19), 8 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 01:49:42,699 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 72 transitions. [2022-11-03 01:49:42,700 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2022-11-03 01:49:42,700 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 01:49:42,700 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 01:49:42,700 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2022-11-03 01:49:42,700 INFO L420 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr23REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 29 more)] === [2022-11-03 01:49:42,701 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 01:49:42,701 INFO L85 PathProgramCache]: Analyzing trace with hash -694845008, now seen corresponding path program 1 times [2022-11-03 01:49:42,701 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 01:49:42,701 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1172822271] [2022-11-03 01:49:42,701 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 01:49:42,701 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 01:49:42,728 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 01:49:43,363 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 01:49:43,363 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 01:49:43,363 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1172822271] [2022-11-03 01:49:43,363 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1172822271] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-03 01:49:43,363 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-03 01:49:43,363 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [15] imperfect sequences [] total 15 [2022-11-03 01:49:43,363 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1570473684] [2022-11-03 01:49:43,364 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-03 01:49:43,364 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2022-11-03 01:49:43,364 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 01:49:43,364 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2022-11-03 01:49:43,365 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=177, Unknown=0, NotChecked=0, Total=210 [2022-11-03 01:49:43,365 INFO L87 Difference]: Start difference. First operand 64 states and 72 transitions. Second operand has 15 states, 15 states have (on average 1.3333333333333333) internal successors, (20), 15 states have internal predecessors, (20), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 01:49:43,930 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 01:49:43,930 INFO L93 Difference]: Finished difference Result 75 states and 81 transitions. [2022-11-03 01:49:43,931 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2022-11-03 01:49:43,931 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.3333333333333333) internal successors, (20), 15 states have internal predecessors, (20), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2022-11-03 01:49:43,931 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 01:49:43,932 INFO L225 Difference]: With dead ends: 75 [2022-11-03 01:49:43,932 INFO L226 Difference]: Without dead ends: 75 [2022-11-03 01:49:43,932 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 37 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=156, Invalid=396, Unknown=0, NotChecked=0, Total=552 [2022-11-03 01:49:43,933 INFO L413 NwaCegarLoop]: 26 mSDtfsCounter, 296 mSDsluCounter, 198 mSDsCounter, 0 mSdLazyCounter, 226 mSolverCounterSat, 50 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 296 SdHoareTripleChecker+Valid, 203 SdHoareTripleChecker+Invalid, 276 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 50 IncrementalHoareTripleChecker+Valid, 226 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-03 01:49:43,933 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [296 Valid, 203 Invalid, 276 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [50 Valid, 226 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-03 01:49:43,934 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2022-11-03 01:49:43,935 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 62. [2022-11-03 01:49:43,936 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 62 states, 46 states have (on average 1.4565217391304348) 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) [2022-11-03 01:49:43,936 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 67 transitions. [2022-11-03 01:49:43,936 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 67 transitions. Word has length 20 [2022-11-03 01:49:43,936 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 01:49:43,936 INFO L495 AbstractCegarLoop]: Abstraction has 62 states and 67 transitions. [2022-11-03 01:49:43,937 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 15 states have (on average 1.3333333333333333) internal successors, (20), 15 states have internal predecessors, (20), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 01:49:43,937 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 67 transitions. [2022-11-03 01:49:43,937 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2022-11-03 01:49:43,937 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 01:49:43,937 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 01:49:43,937 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2022-11-03 01:49:43,938 INFO L420 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr14ASSERT_VIOLATIONMEMORY_FREE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 29 more)] === [2022-11-03 01:49:43,938 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 01:49:43,938 INFO L85 PathProgramCache]: Analyzing trace with hash -709996816, now seen corresponding path program 1 times [2022-11-03 01:49:43,938 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 01:49:43,938 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [742351117] [2022-11-03 01:49:43,938 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 01:49:43,939 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 01:49:43,962 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 01:49:44,027 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2022-11-03 01:49:44,028 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 01:49:44,028 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [742351117] [2022-11-03 01:49:44,028 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [742351117] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-03 01:49:44,028 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-03 01:49:44,028 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-11-03 01:49:44,029 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1376398958] [2022-11-03 01:49:44,029 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-03 01:49:44,029 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-11-03 01:49:44,029 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 01:49:44,030 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-11-03 01:49:44,030 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-11-03 01:49:44,030 INFO L87 Difference]: Start difference. First operand 62 states and 67 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) [2022-11-03 01:49:44,146 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 01:49:44,146 INFO L93 Difference]: Finished difference Result 61 states and 66 transitions. [2022-11-03 01:49:44,146 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-11-03 01:49:44,147 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 20 [2022-11-03 01:49:44,147 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 01:49:44,147 INFO L225 Difference]: With dead ends: 61 [2022-11-03 01:49:44,148 INFO L226 Difference]: Without dead ends: 61 [2022-11-03 01:49:44,148 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2022-11-03 01:49:44,148 INFO L413 NwaCegarLoop]: 27 mSDtfsCounter, 19 mSDsluCounter, 47 mSDsCounter, 0 mSdLazyCounter, 93 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 19 SdHoareTripleChecker+Valid, 66 SdHoareTripleChecker+Invalid, 93 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 93 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-03 01:49:44,149 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [19 Valid, 66 Invalid, 93 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 93 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-03 01:49:44,149 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2022-11-03 01:49:44,150 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 61. [2022-11-03 01:49:44,151 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 61 states, 46 states have (on average 1.434782608695652) internal successors, (66), 60 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) [2022-11-03 01:49:44,151 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 66 transitions. [2022-11-03 01:49:44,151 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 66 transitions. Word has length 20 [2022-11-03 01:49:44,151 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 01:49:44,152 INFO L495 AbstractCegarLoop]: Abstraction has 61 states and 66 transitions. [2022-11-03 01:49:44,152 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) [2022-11-03 01:49:44,152 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 66 transitions. [2022-11-03 01:49:44,152 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2022-11-03 01:49:44,152 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 01:49:44,152 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 01:49:44,153 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2022-11-03 01:49:44,153 INFO L420 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr20REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 29 more)] === [2022-11-03 01:49:44,153 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 01:49:44,153 INFO L85 PathProgramCache]: Analyzing trace with hash -65355619, now seen corresponding path program 1 times [2022-11-03 01:49:44,153 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 01:49:44,154 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1369435784] [2022-11-03 01:49:44,154 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 01:49:44,154 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 01:49:44,180 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 01:49:45,085 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 01:49:45,085 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 01:49:45,086 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1369435784] [2022-11-03 01:49:45,086 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1369435784] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 01:49:45,086 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [983155111] [2022-11-03 01:49:45,086 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 01:49:45,086 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 01:49:45,086 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_051627c3-84bf-4ee4-b3b2-b2dd844ae3af/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 01:49:45,087 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_051627c3-84bf-4ee4-b3b2-b2dd844ae3af/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 01:49:45,089 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_051627c3-84bf-4ee4-b3b2-b2dd844ae3af/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2022-11-03 01:49:45,256 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 01:49:45,260 INFO L263 TraceCheckSpWp]: Trace formula consists of 281 conjuncts, 70 conjunts are in the unsatisfiable core [2022-11-03 01:49:45,265 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 01:49:45,292 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2022-11-03 01:49:45,437 INFO L356 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2022-11-03 01:49:45,437 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 1 case distinctions, treesize of input 12 treesize of output 18 [2022-11-03 01:49:45,566 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 13 treesize of output 9 [2022-11-03 01:49:45,577 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 13 treesize of output 9 [2022-11-03 01:49:45,952 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:49:45,956 INFO L356 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-03 01:49:45,956 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 3 new quantified variables, introduced 1 case distinctions, treesize of input 86 treesize of output 49 [2022-11-03 01:49:45,966 INFO L356 Elim1Store]: treesize reduction 11, result has 8.3 percent of original size [2022-11-03 01:49:45,967 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 45 treesize of output 22 [2022-11-03 01:49:45,997 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 01:49:45,997 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 01:49:46,376 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 130 treesize of output 122 [2022-11-03 01:49:46,545 INFO L356 Elim1Store]: treesize reduction 37, result has 66.7 percent of original size [2022-11-03 01:49:46,546 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 5 select indices, 5 select index equivalence classes, 0 disjoint index pairs (out of 10 index pairs), introduced 6 new quantified variables, introduced 10 case distinctions, treesize of input 260 treesize of output 287 [2022-11-03 01:49:46,991 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:49:47,032 INFO L356 Elim1Store]: treesize reduction 27, result has 57.1 percent of original size [2022-11-03 01:49:47,033 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 4 new quantified variables, introduced 3 case distinctions, treesize of input 284 treesize of output 259 [2022-11-03 01:49:47,208 INFO L356 Elim1Store]: treesize reduction 37, result has 66.7 percent of original size [2022-11-03 01:49:47,208 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 5 select indices, 5 select index equivalence classes, 0 disjoint index pairs (out of 10 index pairs), introduced 6 new quantified variables, introduced 10 case distinctions, treesize of input 560 treesize of output 535 [2022-11-03 01:49:48,395 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 01:49:48,395 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [983155111] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 01:49:48,395 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1796365304] [2022-11-03 01:49:48,398 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2022-11-03 01:49:48,398 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 01:49:48,398 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 01:49:48,399 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 01:49:48,399 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 01:49:48,424 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:49:48,425 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:49:48,427 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 [2022-11-03 01:49:48,455 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:49:48,457 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:49:48,458 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:49:48,460 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:49:48,461 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:49:48,462 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 [2022-11-03 01:49:48,506 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 13 treesize of output 9 [2022-11-03 01:49:48,517 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 13 treesize of output 9 [2022-11-03 01:49:48,534 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:49:48,535 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 34 treesize of output 21 [2022-11-03 01:49:48,564 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:49:48,566 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:49:48,567 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 26 treesize of output 28 [2022-11-03 01:49:48,584 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:49:48,585 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 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 25 treesize of output 13 [2022-11-03 01:49:48,599 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:49:48,601 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 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 25 treesize of output 13 [2022-11-03 01:49:48,638 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-03 01:49:48,639 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 13 [2022-11-03 01:49:48,652 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-03 01:49:48,653 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 13 [2022-11-03 01:49:48,670 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:49:48,672 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:49:48,673 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:49:48,674 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 41 treesize of output 31 [2022-11-03 01:49:48,708 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:49:48,710 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:49:48,711 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:49:48,712 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:49:48,714 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:49:48,715 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:49:48,716 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:49:48,718 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:49:48,719 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:49:48,723 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 13 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 0 case distinctions, treesize of input 34 treesize of output 43 [2022-11-03 01:49:48,826 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:49:48,827 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:49:48,837 INFO L356 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2022-11-03 01:49:48,838 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 3 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 345 treesize of output 327 [2022-11-03 01:49:48,900 INFO L356 Elim1Store]: treesize reduction 19, result has 47.2 percent of original size [2022-11-03 01:49:48,901 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 339 treesize of output 346 [2022-11-03 01:49:48,961 INFO L356 Elim1Store]: treesize reduction 19, result has 47.2 percent of original size [2022-11-03 01:49:48,961 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 333 treesize of output 340 [2022-11-03 01:49:49,228 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:49:49,280 INFO L356 Elim1Store]: treesize reduction 37, result has 33.9 percent of original size [2022-11-03 01:49:49,281 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 2 case distinctions, treesize of input 672 treesize of output 673 [2022-11-03 01:49:49,308 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:49:49,358 INFO L356 Elim1Store]: treesize reduction 37, result has 33.9 percent of original size [2022-11-03 01:49:49,359 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 2 case distinctions, treesize of input 666 treesize of output 667 [2022-11-03 01:49:49,388 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-03 01:49:49,435 INFO L356 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-11-03 01:49:49,436 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 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 647 treesize of output 628 [2022-11-03 01:49:49,952 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-03 01:49:49,954 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-03 01:49:49,980 INFO L356 Elim1Store]: treesize reduction 27, result has 25.0 percent of original size [2022-11-03 01:49:49,980 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 2 new quantified variables, introduced 2 case distinctions, treesize of input 366 treesize of output 359 [2022-11-03 01:49:50,008 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:49:50,010 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:49:50,012 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:49:50,013 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-03 01:49:50,023 INFO L356 Elim1Store]: treesize reduction 36, result has 2.7 percent of original size [2022-11-03 01:49:50,024 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 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 5 case distinctions, treesize of input 442 treesize of output 427 [2022-11-03 01:49:50,050 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-03 01:49:50,051 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-03 01:49:50,074 INFO L356 Elim1Store]: treesize reduction 51, result has 22.7 percent of original size [2022-11-03 01:49:50,075 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 2 new quantified variables, introduced 2 case distinctions, treesize of input 438 treesize of output 431 [2022-11-03 01:49:50,227 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:49:50,325 INFO L356 Elim1Store]: treesize reduction 170, result has 13.7 percent of original size [2022-11-03 01:49:50,326 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 3 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 13 case distinctions, treesize of input 463 treesize of output 467 [2022-11-03 01:49:50,603 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:49:50,604 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:49:50,614 INFO L356 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2022-11-03 01:49:50,615 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 3 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 345 treesize of output 327 [2022-11-03 01:49:50,677 INFO L356 Elim1Store]: treesize reduction 19, result has 47.2 percent of original size [2022-11-03 01:49:50,677 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 339 treesize of output 346 [2022-11-03 01:49:50,744 INFO L356 Elim1Store]: treesize reduction 19, result has 47.2 percent of original size [2022-11-03 01:49:50,744 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 333 treesize of output 340 [2022-11-03 01:49:50,945 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-03 01:49:50,989 INFO L356 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-11-03 01:49:50,990 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 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 353 treesize of output 354 [2022-11-03 01:49:51,021 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:49:51,074 INFO L356 Elim1Store]: treesize reduction 37, result has 33.9 percent of original size [2022-11-03 01:49:51,075 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 2 case distinctions, treesize of input 362 treesize of output 363 [2022-11-03 01:49:51,098 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:49:51,142 INFO L356 Elim1Store]: treesize reduction 37, result has 33.9 percent of original size [2022-11-03 01:49:51,143 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 2 case distinctions, treesize of input 356 treesize of output 357 [2022-11-03 01:49:51,555 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-03 01:49:51,556 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-03 01:49:51,581 INFO L356 Elim1Store]: treesize reduction 27, result has 25.0 percent of original size [2022-11-03 01:49:51,581 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 2 new quantified variables, introduced 2 case distinctions, treesize of input 368 treesize of output 361 [2022-11-03 01:49:51,609 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:49:51,611 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:49:51,612 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:49:51,613 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-03 01:49:51,625 INFO L356 Elim1Store]: treesize reduction 36, result has 2.7 percent of original size [2022-11-03 01:49:51,626 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 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 5 case distinctions, treesize of input 450 treesize of output 435 [2022-11-03 01:49:51,653 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-03 01:49:51,654 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-03 01:49:51,677 INFO L356 Elim1Store]: treesize reduction 51, result has 22.7 percent of original size [2022-11-03 01:49:51,678 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 2 new quantified variables, introduced 2 case distinctions, treesize of input 446 treesize of output 439 [2022-11-03 01:49:52,268 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 [2022-11-03 01:49:52,278 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 [2022-11-03 01:49:52,283 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 01:49:59,042 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3004#(and (<= 1 |ULTIMATE.start_main_~i~0#1|) (<= 1 |ULTIMATE.start_sll_create_#in~data#1|) (<= 0 |ULTIMATE.start_sll_remove_last_~head#1.offset|) (<= |ULTIMATE.start_sll_create_#in~data#1| 1) (<= |ULTIMATE.start_sll_create_~head~0#1.offset| 0) (<= 0 |ULTIMATE.start_sll_remove_last_~head#1.base|) (<= |ULTIMATE.start_sll_create_~len#1| 0) (<= |ULTIMATE.start_sll_create_#res#1.offset| 0) (<= |ULTIMATE.start_sll_remove_last_~head#1.offset| 0) (<= 0 |ULTIMATE.start_sll_remove_last_#in~head#1.offset|) (<= 1 |ULTIMATE.start_sll_create_~data#1|) (or (not (<= (+ |ULTIMATE.start_sll_remove_last_~last~0#1.offset| 8) (select |#length| |ULTIMATE.start_sll_remove_last_~last~0#1.base|))) (not (<= 0 (+ |ULTIMATE.start_sll_remove_last_~last~0#1.offset| 4)))) (= |ULTIMATE.start_main_~data~0#1| 1) (<= |ULTIMATE.start_sll_create_~data#1| 1) (<= |ULTIMATE.start_sll_create_#in~len#1| 2) (<= 0 |ULTIMATE.start_sll_create_~len#1|) (= |ULTIMATE.start_main_~len~0#1| 2) (<= |ULTIMATE.start_main_~#s~0#1.offset| 0) (= |#NULL.offset| 0) (<= |ULTIMATE.start_sll_remove_last_#in~head#1.offset| 0) (<= 0 |ULTIMATE.start_main_~#s~0#1.base|) (<= 0 |ULTIMATE.start_sll_create_#res#1.offset|) (<= 0 (+ |ULTIMATE.start_sll_remove_last_~snd_to_last~0#1.offset| 4)) (<= |ULTIMATE.start_main_~i~0#1| 1) (<= 0 |#StackHeapBarrier|) (<= 2 |ULTIMATE.start_sll_create_#in~len#1|) (<= 0 |ULTIMATE.start_main_~#s~0#1.offset|) (<= 0 |ULTIMATE.start_sll_create_~head~0#1.offset|) (= |#NULL.base| 0) (<= 0 |ULTIMATE.start_sll_remove_last_#in~head#1.base|))' at error location [2022-11-03 01:49:59,042 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 01:49:59,042 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 01:49:59,042 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 31 [2022-11-03 01:49:59,043 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1026429998] [2022-11-03 01:49:59,043 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 01:49:59,043 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2022-11-03 01:49:59,043 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 01:49:59,044 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2022-11-03 01:49:59,044 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=190, Invalid=1790, Unknown=0, NotChecked=0, Total=1980 [2022-11-03 01:49:59,045 INFO L87 Difference]: Start difference. First operand 61 states and 66 transitions. Second operand has 32 states, 31 states have (on average 1.967741935483871) internal successors, (61), 32 states have internal predecessors, (61), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 01:50:00,751 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 01:50:00,751 INFO L93 Difference]: Finished difference Result 118 states and 125 transitions. [2022-11-03 01:50:00,751 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2022-11-03 01:50:00,752 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 31 states have (on average 1.967741935483871) internal successors, (61), 32 states have internal predecessors, (61), 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 [2022-11-03 01:50:00,752 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 01:50:00,754 INFO L225 Difference]: With dead ends: 118 [2022-11-03 01:50:00,754 INFO L226 Difference]: Without dead ends: 118 [2022-11-03 01:50:00,755 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 84 GetRequests, 28 SyntacticMatches, 1 SemanticMatches, 55 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 548 ImplicationChecksByTransitivity, 9.2s TimeCoverageRelationStatistics Valid=441, Invalid=2751, Unknown=0, NotChecked=0, Total=3192 [2022-11-03 01:50:00,756 INFO L413 NwaCegarLoop]: 25 mSDtfsCounter, 646 mSDsluCounter, 448 mSDsCounter, 0 mSdLazyCounter, 419 mSolverCounterSat, 33 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 646 SdHoareTripleChecker+Valid, 428 SdHoareTripleChecker+Invalid, 566 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 33 IncrementalHoareTripleChecker+Valid, 419 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 114 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-11-03 01:50:00,756 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [646 Valid, 428 Invalid, 566 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [33 Valid, 419 Invalid, 0 Unknown, 114 Unchecked, 0.5s Time] [2022-11-03 01:50:00,756 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 118 states. [2022-11-03 01:50:00,759 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 118 to 62. [2022-11-03 01:50:00,760 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 62 states, 47 states have (on average 1.446808510638298) internal successors, (68), 61 states have internal predecessors, (68), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 01:50:00,760 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 68 transitions. [2022-11-03 01:50:00,760 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 68 transitions. Word has length 21 [2022-11-03 01:50:00,761 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 01:50:00,761 INFO L495 AbstractCegarLoop]: Abstraction has 62 states and 68 transitions. [2022-11-03 01:50:00,761 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 31 states have (on average 1.967741935483871) internal successors, (61), 32 states have internal predecessors, (61), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 01:50:00,761 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 68 transitions. [2022-11-03 01:50:00,762 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2022-11-03 01:50:00,762 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 01:50:00,762 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 01:50:00,813 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_051627c3-84bf-4ee4-b3b2-b2dd844ae3af/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2022-11-03 01:50:00,990 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_051627c3-84bf-4ee4-b3b2-b2dd844ae3af/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2022-11-03 01:50:00,990 INFO L420 AbstractCegarLoop]: === Iteration 19 === Targeting ULTIMATE.startErr19REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 29 more)] === [2022-11-03 01:50:00,991 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 01:50:00,991 INFO L85 PathProgramCache]: Analyzing trace with hash -65355620, now seen corresponding path program 1 times [2022-11-03 01:50:00,991 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 01:50:00,991 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [538547923] [2022-11-03 01:50:00,991 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 01:50:00,992 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 01:50:01,018 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 01:50:01,726 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 01:50:01,727 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 01:50:01,727 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [538547923] [2022-11-03 01:50:01,727 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [538547923] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 01:50:01,727 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1771587936] [2022-11-03 01:50:01,727 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 01:50:01,727 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 01:50:01,728 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_051627c3-84bf-4ee4-b3b2-b2dd844ae3af/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 01:50:01,730 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_051627c3-84bf-4ee4-b3b2-b2dd844ae3af/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 01:50:01,759 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_051627c3-84bf-4ee4-b3b2-b2dd844ae3af/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2022-11-03 01:50:01,906 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 01:50:01,909 INFO L263 TraceCheckSpWp]: Trace formula consists of 281 conjuncts, 53 conjunts are in the unsatisfiable core [2022-11-03 01:50:01,911 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 01:50:01,960 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2022-11-03 01:50:01,990 INFO L356 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-11-03 01:50:01,990 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 [2022-11-03 01:50:02,110 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 13 treesize of output 9 [2022-11-03 01:50:02,380 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 15 treesize of output 7 [2022-11-03 01:50:02,462 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 9 [2022-11-03 01:50:02,563 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:50:02,564 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-03 01:50:02,568 INFO L356 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-03 01:50:02,568 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 4 new quantified variables, introduced 3 case distinctions, treesize of input 47 treesize of output 19 [2022-11-03 01:50:02,574 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 6 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 01:50:02,574 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 01:50:02,788 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 43 treesize of output 31 [2022-11-03 01:50:02,899 INFO L356 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-03 01:50:02,900 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 4 new quantified variables, introduced 3 case distinctions, treesize of input 206 treesize of output 212 [2022-11-03 01:50:03,850 INFO L356 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2022-11-03 01:50:03,850 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 30 treesize of output 1 [2022-11-03 01:50:03,852 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 6 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 01:50:03,852 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1771587936] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 01:50:03,852 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1346914110] [2022-11-03 01:50:03,854 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2022-11-03 01:50:03,854 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 01:50:03,855 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 01:50:03,855 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 01:50:03,855 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 01:50:03,879 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:50:03,881 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:50:03,882 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 [2022-11-03 01:50:03,912 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:50:03,913 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:50:03,915 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:50:03,917 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:50:03,918 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:50:03,919 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 [2022-11-03 01:50:03,956 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 13 treesize of output 9 [2022-11-03 01:50:03,967 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 13 treesize of output 9 [2022-11-03 01:50:03,984 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:50:03,985 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 34 treesize of output 21 [2022-11-03 01:50:04,017 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:50:04,018 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 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 25 treesize of output 13 [2022-11-03 01:50:04,035 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:50:04,037 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:50:04,038 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 26 treesize of output 28 [2022-11-03 01:50:04,056 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:50:04,057 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 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 25 treesize of output 13 [2022-11-03 01:50:04,102 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-03 01:50:04,103 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 13 [2022-11-03 01:50:04,117 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:50:04,118 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:50:04,120 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:50:04,121 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 41 treesize of output 31 [2022-11-03 01:50:04,137 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-03 01:50:04,138 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 13 [2022-11-03 01:50:04,180 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:50:04,182 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:50:04,184 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:50:04,185 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:50:04,187 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:50:04,189 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:50:04,190 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:50:04,192 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:50:04,194 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:50:04,197 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 13 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 0 case distinctions, treesize of input 34 treesize of output 43 [2022-11-03 01:50:04,360 INFO L356 Elim1Store]: treesize reduction 19, result has 47.2 percent of original size [2022-11-03 01:50:04,361 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 339 treesize of output 346 [2022-11-03 01:50:04,383 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:50:04,385 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:50:04,394 INFO L356 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2022-11-03 01:50:04,395 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 3 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 339 treesize of output 321 [2022-11-03 01:50:04,456 INFO L356 Elim1Store]: treesize reduction 19, result has 47.2 percent of original size [2022-11-03 01:50:04,456 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 333 treesize of output 340 [2022-11-03 01:50:04,845 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:50:04,909 INFO L356 Elim1Store]: treesize reduction 37, result has 33.9 percent of original size [2022-11-03 01:50:04,910 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 2 case distinctions, treesize of input 672 treesize of output 673 [2022-11-03 01:50:04,943 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-03 01:50:04,993 INFO L356 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-11-03 01:50:04,994 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 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 653 treesize of output 634 [2022-11-03 01:50:05,032 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:50:05,092 INFO L356 Elim1Store]: treesize reduction 37, result has 33.9 percent of original size [2022-11-03 01:50:05,093 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 2 case distinctions, treesize of input 658 treesize of output 659 [2022-11-03 01:50:05,579 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-03 01:50:05,580 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-03 01:50:05,606 INFO L356 Elim1Store]: treesize reduction 25, result has 21.9 percent of original size [2022-11-03 01:50:05,606 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 2 new quantified variables, introduced 2 case distinctions, treesize of input 348 treesize of output 341 [2022-11-03 01:50:05,632 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:50:05,634 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:50:05,635 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:50:05,636 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-03 01:50:05,648 INFO L356 Elim1Store]: treesize reduction 36, result has 2.7 percent of original size [2022-11-03 01:50:05,648 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 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 5 case distinctions, treesize of input 418 treesize of output 403 [2022-11-03 01:50:05,670 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-03 01:50:05,671 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-03 01:50:05,690 INFO L356 Elim1Store]: treesize reduction 49, result has 21.0 percent of original size [2022-11-03 01:50:05,694 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 2 new quantified variables, introduced 2 case distinctions, treesize of input 414 treesize of output 407 [2022-11-03 01:50:05,827 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:50:05,941 INFO L356 Elim1Store]: treesize reduction 170, result has 13.7 percent of original size [2022-11-03 01:50:05,941 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 3 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 13 case distinctions, treesize of input 415 treesize of output 419 [2022-11-03 01:50:06,206 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:50:06,208 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:50:06,218 INFO L356 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2022-11-03 01:50:06,218 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 3 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 345 treesize of output 327 [2022-11-03 01:50:06,278 INFO L356 Elim1Store]: treesize reduction 19, result has 47.2 percent of original size [2022-11-03 01:50:06,279 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 339 treesize of output 346 [2022-11-03 01:50:06,344 INFO L356 Elim1Store]: treesize reduction 19, result has 47.2 percent of original size [2022-11-03 01:50:06,344 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 333 treesize of output 340 [2022-11-03 01:50:06,523 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:50:06,571 INFO L356 Elim1Store]: treesize reduction 37, result has 33.9 percent of original size [2022-11-03 01:50:06,571 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 2 case distinctions, treesize of input 366 treesize of output 367 [2022-11-03 01:50:06,592 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-03 01:50:06,630 INFO L356 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-11-03 01:50:06,631 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 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 347 treesize of output 348 [2022-11-03 01:50:06,668 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:50:06,718 INFO L356 Elim1Store]: treesize reduction 37, result has 33.9 percent of original size [2022-11-03 01:50:06,718 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 2 case distinctions, treesize of input 356 treesize of output 357 [2022-11-03 01:50:07,184 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:50:07,186 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:50:07,188 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:50:07,189 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-03 01:50:07,199 INFO L356 Elim1Store]: treesize reduction 24, result has 4.0 percent of original size [2022-11-03 01:50:07,200 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 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 5 case distinctions, treesize of input 356 treesize of output 341 [2022-11-03 01:50:07,227 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-03 01:50:07,228 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-03 01:50:07,248 INFO L356 Elim1Store]: treesize reduction 25, result has 21.9 percent of original size [2022-11-03 01:50:07,248 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 2 new quantified variables, introduced 2 case distinctions, treesize of input 352 treesize of output 345 [2022-11-03 01:50:07,276 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-03 01:50:07,277 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-03 01:50:07,301 INFO L356 Elim1Store]: treesize reduction 25, result has 21.9 percent of original size [2022-11-03 01:50:07,301 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 2 new quantified variables, introduced 2 case distinctions, treesize of input 364 treesize of output 357 [2022-11-03 01:50:07,775 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 [2022-11-03 01:50:07,786 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 [2022-11-03 01:50:07,788 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 01:50:14,016 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3370#(and (<= 1 |ULTIMATE.start_main_~i~0#1|) (<= 1 |ULTIMATE.start_sll_create_#in~data#1|) (<= 0 |ULTIMATE.start_sll_remove_last_~head#1.offset|) (<= |ULTIMATE.start_sll_create_#in~data#1| 1) (<= |ULTIMATE.start_sll_create_~head~0#1.offset| 0) (<= 0 |ULTIMATE.start_sll_remove_last_~head#1.base|) (<= |ULTIMATE.start_sll_create_~len#1| 0) (<= |ULTIMATE.start_sll_create_#res#1.offset| 0) (<= |ULTIMATE.start_sll_remove_last_~head#1.offset| 0) (<= 0 |ULTIMATE.start_sll_remove_last_#in~head#1.offset|) (<= 1 |ULTIMATE.start_sll_create_~data#1|) (= |ULTIMATE.start_main_~data~0#1| 1) (<= |ULTIMATE.start_sll_create_~data#1| 1) (<= |ULTIMATE.start_sll_create_#in~len#1| 2) (= |ULTIMATE.start_main_~#s~0#1.offset| 0) (<= 0 |ULTIMATE.start_sll_create_~len#1|) (= |ULTIMATE.start_main_~len~0#1| 2) (= |#NULL.offset| 0) (<= |ULTIMATE.start_sll_remove_last_#in~head#1.offset| 0) (<= 0 |ULTIMATE.start_main_~#s~0#1.base|) (<= 0 |ULTIMATE.start_sll_create_#res#1.offset|) (<= 0 (+ |ULTIMATE.start_sll_remove_last_~snd_to_last~0#1.offset| 4)) (<= |ULTIMATE.start_main_~i~0#1| 1) (<= 0 |#StackHeapBarrier|) (<= 2 |ULTIMATE.start_sll_create_#in~len#1|) (<= 0 |ULTIMATE.start_sll_create_~head~0#1.offset|) (= |#NULL.base| 0) (not (= (select |#valid| |ULTIMATE.start_sll_remove_last_~last~0#1.base|) 1)) (<= 0 |ULTIMATE.start_sll_remove_last_#in~head#1.base|))' at error location [2022-11-03 01:50:14,017 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 01:50:14,017 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 01:50:14,017 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 10, 10] total 28 [2022-11-03 01:50:14,017 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1157361293] [2022-11-03 01:50:14,017 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 01:50:14,018 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 29 states [2022-11-03 01:50:14,018 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 01:50:14,018 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2022-11-03 01:50:14,019 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=164, Invalid=1558, Unknown=0, NotChecked=0, Total=1722 [2022-11-03 01:50:14,019 INFO L87 Difference]: Start difference. First operand 62 states and 68 transitions. Second operand has 29 states, 28 states have (on average 2.142857142857143) internal successors, (60), 29 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) [2022-11-03 01:50:14,779 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 01:50:14,779 INFO L93 Difference]: Finished difference Result 62 states and 67 transitions. [2022-11-03 01:50:14,780 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2022-11-03 01:50:14,780 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 28 states have (on average 2.142857142857143) internal successors, (60), 29 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) Word has length 21 [2022-11-03 01:50:14,780 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 01:50:14,781 INFO L225 Difference]: With dead ends: 62 [2022-11-03 01:50:14,781 INFO L226 Difference]: Without dead ends: 62 [2022-11-03 01:50:14,782 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 81 GetRequests, 32 SyntacticMatches, 0 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 528 ImplicationChecksByTransitivity, 7.5s TimeCoverageRelationStatistics Valid=255, Invalid=2295, Unknown=0, NotChecked=0, Total=2550 [2022-11-03 01:50:14,782 INFO L413 NwaCegarLoop]: 24 mSDtfsCounter, 21 mSDsluCounter, 230 mSDsCounter, 0 mSdLazyCounter, 324 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 21 SdHoareTripleChecker+Valid, 222 SdHoareTripleChecker+Invalid, 492 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 324 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 161 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-03 01:50:14,783 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [21 Valid, 222 Invalid, 492 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 324 Invalid, 0 Unknown, 161 Unchecked, 0.3s Time] [2022-11-03 01:50:14,783 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2022-11-03 01:50:14,784 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 62. [2022-11-03 01:50:14,785 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 62 states, 47 states have (on average 1.425531914893617) 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) [2022-11-03 01:50:14,785 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 67 transitions. [2022-11-03 01:50:14,785 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 67 transitions. Word has length 21 [2022-11-03 01:50:14,785 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 01:50:14,785 INFO L495 AbstractCegarLoop]: Abstraction has 62 states and 67 transitions. [2022-11-03 01:50:14,786 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 29 states, 28 states have (on average 2.142857142857143) internal successors, (60), 29 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) [2022-11-03 01:50:14,786 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 67 transitions. [2022-11-03 01:50:14,787 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2022-11-03 01:50:14,787 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 01:50:14,787 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 01:50:14,836 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_051627c3-84bf-4ee4-b3b2-b2dd844ae3af/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2022-11-03 01:50:14,988 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_051627c3-84bf-4ee4-b3b2-b2dd844ae3af/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 01:50:14,988 INFO L420 AbstractCegarLoop]: === Iteration 20 === Targeting ULTIMATE.startErr15REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 29 more)] === [2022-11-03 01:50:14,988 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 01:50:14,988 INFO L85 PathProgramCache]: Analyzing trace with hash -535064719, now seen corresponding path program 1 times [2022-11-03 01:50:14,989 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 01:50:14,989 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [671232483] [2022-11-03 01:50:14,989 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 01:50:14,989 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 01:50:15,015 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 01:50:15,298 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-03 01:50:15,298 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 01:50:15,298 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [671232483] [2022-11-03 01:50:15,298 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [671232483] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 01:50:15,298 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [150623837] [2022-11-03 01:50:15,298 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 01:50:15,298 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 01:50:15,299 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_051627c3-84bf-4ee4-b3b2-b2dd844ae3af/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 01:50:15,300 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_051627c3-84bf-4ee4-b3b2-b2dd844ae3af/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 01:50:15,310 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_051627c3-84bf-4ee4-b3b2-b2dd844ae3af/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2022-11-03 01:50:15,484 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 01:50:15,486 INFO L263 TraceCheckSpWp]: Trace formula consists of 266 conjuncts, 8 conjunts are in the unsatisfiable core [2022-11-03 01:50:15,488 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 01:50:15,603 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:50:15,604 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 [2022-11-03 01:50:15,608 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2022-11-03 01:50:15,608 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-03 01:50:15,609 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [150623837] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-03 01:50:15,609 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-11-03 01:50:15,609 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [9] total 12 [2022-11-03 01:50:15,609 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1441154142] [2022-11-03 01:50:15,609 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-03 01:50:15,610 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2022-11-03 01:50:15,610 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 01:50:15,610 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2022-11-03 01:50:15,610 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=150, Unknown=0, NotChecked=0, Total=182 [2022-11-03 01:50:15,611 INFO L87 Difference]: Start difference. First operand 62 states and 67 transitions. Second operand has 7 states, 6 states have (on average 2.6666666666666665) internal successors, (16), 6 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 01:50:15,749 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 01:50:15,749 INFO L93 Difference]: Finished difference Result 68 states and 74 transitions. [2022-11-03 01:50:15,749 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2022-11-03 01:50:15,749 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 2.6666666666666665) internal successors, (16), 6 states have internal predecessors, (16), 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 [2022-11-03 01:50:15,750 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 01:50:15,750 INFO L225 Difference]: With dead ends: 68 [2022-11-03 01:50:15,750 INFO L226 Difference]: Without dead ends: 68 [2022-11-03 01:50:15,750 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 16 SyntacticMatches, 1 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=53, Invalid=219, Unknown=0, NotChecked=0, Total=272 [2022-11-03 01:50:15,751 INFO L413 NwaCegarLoop]: 16 mSDtfsCounter, 111 mSDsluCounter, 25 mSDsCounter, 0 mSdLazyCounter, 71 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 111 SdHoareTripleChecker+Valid, 35 SdHoareTripleChecker+Invalid, 78 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 71 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-03 01:50:15,751 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [111 Valid, 35 Invalid, 78 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 71 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-03 01:50:15,752 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2022-11-03 01:50:15,753 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 61. [2022-11-03 01:50:15,753 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 61 states, 47 states have (on average 1.4042553191489362) internal successors, (66), 60 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) [2022-11-03 01:50:15,753 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 66 transitions. [2022-11-03 01:50:15,754 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 66 transitions. Word has length 21 [2022-11-03 01:50:15,754 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 01:50:15,754 INFO L495 AbstractCegarLoop]: Abstraction has 61 states and 66 transitions. [2022-11-03 01:50:15,754 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 6 states have (on average 2.6666666666666665) internal successors, (16), 6 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 01:50:15,754 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 66 transitions. [2022-11-03 01:50:15,754 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2022-11-03 01:50:15,755 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 01:50:15,755 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 01:50:15,803 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_051627c3-84bf-4ee4-b3b2-b2dd844ae3af/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2022-11-03 01:50:15,966 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_051627c3-84bf-4ee4-b3b2-b2dd844ae3af/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 01:50:15,966 INFO L420 AbstractCegarLoop]: === Iteration 21 === Targeting ULTIMATE.startErr23REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 29 more)] === [2022-11-03 01:50:15,966 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 01:50:15,967 INFO L85 PathProgramCache]: Analyzing trace with hash 1617760326, now seen corresponding path program 1 times [2022-11-03 01:50:15,967 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 01:50:15,967 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [634407229] [2022-11-03 01:50:15,967 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 01:50:15,967 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 01:50:15,988 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 01:50:16,072 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2022-11-03 01:50:16,073 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 01:50:16,073 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [634407229] [2022-11-03 01:50:16,073 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [634407229] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 01:50:16,073 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2070043545] [2022-11-03 01:50:16,073 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 01:50:16,074 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 01:50:16,074 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_051627c3-84bf-4ee4-b3b2-b2dd844ae3af/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 01:50:16,075 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_051627c3-84bf-4ee4-b3b2-b2dd844ae3af/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 01:50:16,094 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_051627c3-84bf-4ee4-b3b2-b2dd844ae3af/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2022-11-03 01:50:16,260 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 01:50:16,263 INFO L263 TraceCheckSpWp]: Trace formula consists of 293 conjuncts, 7 conjunts are in the unsatisfiable core [2022-11-03 01:50:16,271 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 01:50:16,278 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 7 treesize of output 3 [2022-11-03 01:50:16,288 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2022-11-03 01:50:16,288 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 01:50:16,300 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2022-11-03 01:50:16,300 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2070043545] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 01:50:16,301 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1329776287] [2022-11-03 01:50:16,305 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2022-11-03 01:50:16,305 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 01:50:16,306 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 01:50:16,306 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 01:50:16,306 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 01:50:16,330 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:50:16,331 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:50:16,332 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 [2022-11-03 01:50:16,361 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:50:16,362 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:50:16,364 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:50:16,365 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:50:16,367 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:50:16,368 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 [2022-11-03 01:50:16,398 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 13 treesize of output 9 [2022-11-03 01:50:16,411 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:50:16,412 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 34 treesize of output 21 [2022-11-03 01:50:16,429 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 13 treesize of output 9 [2022-11-03 01:50:16,451 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:50:16,452 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 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 25 treesize of output 13 [2022-11-03 01:50:16,467 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:50:16,468 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:50:16,469 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 26 treesize of output 28 [2022-11-03 01:50:16,489 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:50:16,490 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 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 25 treesize of output 13 [2022-11-03 01:50:16,517 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-03 01:50:16,518 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 13 [2022-11-03 01:50:16,535 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:50:16,536 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:50:16,538 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:50:16,539 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 41 treesize of output 31 [2022-11-03 01:50:16,564 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-03 01:50:16,565 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 13 [2022-11-03 01:50:16,598 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:50:16,600 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:50:16,601 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:50:16,602 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:50:16,604 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:50:16,605 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:50:16,607 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:50:16,608 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:50:16,610 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:50:16,611 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 13 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 0 case distinctions, treesize of input 34 treesize of output 43 [2022-11-03 01:50:16,716 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:50:16,717 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:50:16,727 INFO L356 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2022-11-03 01:50:16,727 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 3 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 352 treesize of output 334 [2022-11-03 01:50:16,791 INFO L356 Elim1Store]: treesize reduction 19, result has 47.2 percent of original size [2022-11-03 01:50:16,791 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 346 treesize of output 353 [2022-11-03 01:50:16,850 INFO L356 Elim1Store]: treesize reduction 19, result has 47.2 percent of original size [2022-11-03 01:50:16,851 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 340 treesize of output 347 [2022-11-03 01:50:17,034 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-03 01:50:17,077 INFO L356 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-11-03 01:50:17,078 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 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 360 treesize of output 361 [2022-11-03 01:50:17,104 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:50:17,143 INFO L356 Elim1Store]: treesize reduction 37, result has 33.9 percent of original size [2022-11-03 01:50:17,144 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 2 case distinctions, treesize of input 369 treesize of output 370 [2022-11-03 01:50:17,164 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:50:17,211 INFO L356 Elim1Store]: treesize reduction 37, result has 33.9 percent of original size [2022-11-03 01:50:17,212 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 2 case distinctions, treesize of input 363 treesize of output 364 [2022-11-03 01:50:17,738 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-03 01:50:17,739 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-03 01:50:17,761 INFO L356 Elim1Store]: treesize reduction 25, result has 21.9 percent of original size [2022-11-03 01:50:17,761 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 2 new quantified variables, introduced 2 case distinctions, treesize of input 352 treesize of output 345 [2022-11-03 01:50:17,800 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:50:17,802 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:50:17,804 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:50:17,805 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-03 01:50:17,816 INFO L356 Elim1Store]: treesize reduction 36, result has 2.7 percent of original size [2022-11-03 01:50:17,817 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 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 5 case distinctions, treesize of input 428 treesize of output 413 [2022-11-03 01:50:17,842 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-03 01:50:17,843 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-03 01:50:17,864 INFO L356 Elim1Store]: treesize reduction 49, result has 21.0 percent of original size [2022-11-03 01:50:17,864 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 2 new quantified variables, introduced 2 case distinctions, treesize of input 424 treesize of output 417 [2022-11-03 01:50:18,002 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:50:18,081 INFO L356 Elim1Store]: treesize reduction 170, result has 13.7 percent of original size [2022-11-03 01:50:18,082 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 3 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 13 case distinctions, treesize of input 425 treesize of output 429 [2022-11-03 01:50:18,273 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:50:18,274 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:50:18,283 INFO L356 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2022-11-03 01:50:18,283 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 3 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 352 treesize of output 334 [2022-11-03 01:50:18,343 INFO L356 Elim1Store]: treesize reduction 19, result has 47.2 percent of original size [2022-11-03 01:50:18,343 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 346 treesize of output 353 [2022-11-03 01:50:18,398 INFO L356 Elim1Store]: treesize reduction 19, result has 47.2 percent of original size [2022-11-03 01:50:18,398 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 340 treesize of output 347 [2022-11-03 01:50:18,716 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:50:18,769 INFO L356 Elim1Store]: treesize reduction 37, result has 33.9 percent of original size [2022-11-03 01:50:18,770 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 2 case distinctions, treesize of input 686 treesize of output 687 [2022-11-03 01:50:18,796 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-03 01:50:18,838 INFO L356 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-11-03 01:50:18,839 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 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 667 treesize of output 648 [2022-11-03 01:50:18,875 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:50:18,935 INFO L356 Elim1Store]: treesize reduction 37, result has 33.9 percent of original size [2022-11-03 01:50:18,936 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 2 case distinctions, treesize of input 672 treesize of output 673 [2022-11-03 01:50:19,330 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-03 01:50:19,332 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-03 01:50:19,359 INFO L356 Elim1Store]: treesize reduction 25, result has 21.9 percent of original size [2022-11-03 01:50:19,360 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 2 new quantified variables, introduced 2 case distinctions, treesize of input 352 treesize of output 345 [2022-11-03 01:50:19,395 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:50:19,397 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:50:19,399 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:50:19,400 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-03 01:50:19,411 INFO L356 Elim1Store]: treesize reduction 24, result has 4.0 percent of original size [2022-11-03 01:50:19,411 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 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 5 case distinctions, treesize of input 368 treesize of output 353 [2022-11-03 01:50:19,442 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-03 01:50:19,443 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-03 01:50:19,464 INFO L356 Elim1Store]: treesize reduction 25, result has 21.9 percent of original size [2022-11-03 01:50:19,465 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 2 new quantified variables, introduced 2 case distinctions, treesize of input 364 treesize of output 357 [2022-11-03 01:50:19,901 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 [2022-11-03 01:50:19,909 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 [2022-11-03 01:50:19,920 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 01:50:25,208 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3872#(and (not (= (select |#valid| |ULTIMATE.start_sll_remove_last_~snd_to_last~0#1.base|) 1)) (<= 1 |ULTIMATE.start_main_~i~0#1|) (<= 1 |ULTIMATE.start_sll_create_#in~data#1|) (<= 0 |ULTIMATE.start_sll_remove_last_~head#1.offset|) (<= |ULTIMATE.start_sll_create_#in~data#1| 1) (<= |ULTIMATE.start_sll_create_~head~0#1.offset| 0) (<= 0 |ULTIMATE.start_sll_remove_last_~head#1.base|) (<= |ULTIMATE.start_sll_create_~len#1| 0) (<= |ULTIMATE.start_sll_create_#res#1.offset| 0) (<= |ULTIMATE.start_sll_remove_last_~head#1.offset| 0) (<= 0 |ULTIMATE.start_sll_remove_last_#in~head#1.offset|) (<= 1 |ULTIMATE.start_sll_create_~data#1|) (= |ULTIMATE.start_main_~data~0#1| 1) (<= |ULTIMATE.start_sll_create_~data#1| 1) (<= |ULTIMATE.start_sll_create_#in~len#1| 2) (= |ULTIMATE.start_main_~#s~0#1.offset| 0) (<= 0 |ULTIMATE.start_sll_create_~len#1|) (= |ULTIMATE.start_main_~len~0#1| 2) (= |#NULL.offset| 0) (<= |ULTIMATE.start_sll_remove_last_#in~head#1.offset| 0) (<= 0 |ULTIMATE.start_main_~#s~0#1.base|) (<= 0 (+ |ULTIMATE.start_sll_remove_last_~last~0#1.offset| 4)) (<= 0 |ULTIMATE.start_sll_create_#res#1.offset|) (<= 0 (+ |ULTIMATE.start_sll_remove_last_~snd_to_last~0#1.offset| 4)) (<= |ULTIMATE.start_main_~i~0#1| 1) (<= 0 |#StackHeapBarrier|) (<= 2 |ULTIMATE.start_sll_create_#in~len#1|) (<= 0 |ULTIMATE.start_sll_create_~head~0#1.offset|) (= |#NULL.base| 0) (<= 0 |ULTIMATE.start_sll_remove_last_#in~head#1.base|))' at error location [2022-11-03 01:50:25,208 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 01:50:25,208 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 01:50:25,208 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 3, 3] total 5 [2022-11-03 01:50:25,209 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1744076609] [2022-11-03 01:50:25,209 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 01:50:25,209 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-11-03 01:50:25,209 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 01:50:25,210 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-11-03 01:50:25,210 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=275, Unknown=0, NotChecked=0, Total=342 [2022-11-03 01:50:25,210 INFO L87 Difference]: Start difference. First operand 61 states and 66 transitions. Second operand has 6 states, 5 states have (on average 4.6) internal successors, (23), 6 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 01:50:25,379 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 01:50:25,379 INFO L93 Difference]: Finished difference Result 65 states and 70 transitions. [2022-11-03 01:50:25,380 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2022-11-03 01:50:25,380 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 4.6) internal successors, (23), 6 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 23 [2022-11-03 01:50:25,380 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 01:50:25,381 INFO L225 Difference]: With dead ends: 65 [2022-11-03 01:50:25,381 INFO L226 Difference]: Without dead ends: 65 [2022-11-03 01:50:25,382 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 78 GetRequests, 56 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 106 ImplicationChecksByTransitivity, 5.3s TimeCoverageRelationStatistics Valid=92, Invalid=460, Unknown=0, NotChecked=0, Total=552 [2022-11-03 01:50:25,382 INFO L413 NwaCegarLoop]: 22 mSDtfsCounter, 41 mSDsluCounter, 46 mSDsCounter, 0 mSdLazyCounter, 132 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 41 SdHoareTripleChecker+Valid, 57 SdHoareTripleChecker+Invalid, 137 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 132 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-03 01:50:25,383 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [41 Valid, 57 Invalid, 137 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 132 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-03 01:50:25,383 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2022-11-03 01:50:25,385 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 63. [2022-11-03 01:50:25,386 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 63 states, 49 states have (on average 1.4285714285714286) internal successors, (70), 62 states have internal predecessors, (70), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 01:50:25,386 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 70 transitions. [2022-11-03 01:50:25,386 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 70 transitions. Word has length 23 [2022-11-03 01:50:25,387 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 01:50:25,387 INFO L495 AbstractCegarLoop]: Abstraction has 63 states and 70 transitions. [2022-11-03 01:50:25,387 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 4.6) internal successors, (23), 6 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 01:50:25,387 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 70 transitions. [2022-11-03 01:50:25,388 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2022-11-03 01:50:25,388 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 01:50:25,388 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 01:50:25,424 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_051627c3-84bf-4ee4-b3b2-b2dd844ae3af/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2022-11-03 01:50:25,602 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_051627c3-84bf-4ee4-b3b2-b2dd844ae3af/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 01:50:25,602 INFO L420 AbstractCegarLoop]: === Iteration 22 === Targeting ULTIMATE.startErr24REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 29 more)] === [2022-11-03 01:50:25,603 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 01:50:25,603 INFO L85 PathProgramCache]: Analyzing trace with hash 1617760327, now seen corresponding path program 1 times [2022-11-03 01:50:25,603 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 01:50:25,603 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1945247198] [2022-11-03 01:50:25,603 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 01:50:25,603 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 01:50:25,632 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 01:50:25,987 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 6 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-03 01:50:25,987 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 01:50:25,987 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1945247198] [2022-11-03 01:50:25,988 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1945247198] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 01:50:25,988 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [680513830] [2022-11-03 01:50:25,988 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 01:50:25,988 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 01:50:25,988 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_051627c3-84bf-4ee4-b3b2-b2dd844ae3af/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 01:50:25,990 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_051627c3-84bf-4ee4-b3b2-b2dd844ae3af/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 01:50:26,024 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_051627c3-84bf-4ee4-b3b2-b2dd844ae3af/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2022-11-03 01:50:26,193 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 01:50:26,196 INFO L263 TraceCheckSpWp]: Trace formula consists of 293 conjuncts, 9 conjunts are in the unsatisfiable core [2022-11-03 01:50:26,200 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 01:50:26,205 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 7 treesize of output 3 [2022-11-03 01:50:26,262 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2022-11-03 01:50:26,262 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 01:50:26,288 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2022-11-03 01:50:26,289 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [680513830] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 01:50:26,289 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1290165160] [2022-11-03 01:50:26,291 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2022-11-03 01:50:26,292 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 01:50:26,292 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 01:50:26,292 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 01:50:26,292 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 01:50:26,313 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:50:26,314 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:50:26,315 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 [2022-11-03 01:50:26,341 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:50:26,343 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:50:26,345 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:50:26,346 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:50:26,348 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:50:26,349 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 [2022-11-03 01:50:26,386 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 13 treesize of output 9 [2022-11-03 01:50:26,397 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 13 treesize of output 9 [2022-11-03 01:50:26,415 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:50:26,416 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 34 treesize of output 21 [2022-11-03 01:50:26,446 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:50:26,447 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 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 25 treesize of output 13 [2022-11-03 01:50:26,463 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:50:26,465 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:50:26,466 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 26 treesize of output 28 [2022-11-03 01:50:26,483 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:50:26,484 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 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 25 treesize of output 13 [2022-11-03 01:50:26,526 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-03 01:50:26,527 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 13 [2022-11-03 01:50:26,540 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-03 01:50:26,541 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 13 [2022-11-03 01:50:26,557 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:50:26,559 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:50:26,560 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:50:26,561 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 41 treesize of output 31 [2022-11-03 01:50:26,603 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:50:26,605 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:50:26,606 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:50:26,608 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:50:26,609 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:50:26,611 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:50:26,612 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:50:26,614 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:50:26,616 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:50:26,617 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 13 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 0 case distinctions, treesize of input 34 treesize of output 43 [2022-11-03 01:50:26,777 INFO L356 Elim1Store]: treesize reduction 19, result has 47.2 percent of original size [2022-11-03 01:50:26,778 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 346 treesize of output 353 [2022-11-03 01:50:26,842 INFO L356 Elim1Store]: treesize reduction 19, result has 47.2 percent of original size [2022-11-03 01:50:26,842 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 340 treesize of output 347 [2022-11-03 01:50:26,868 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:50:26,870 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:50:26,881 INFO L356 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2022-11-03 01:50:26,882 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 3 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 340 treesize of output 322 [2022-11-03 01:50:27,236 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:50:27,292 INFO L356 Elim1Store]: treesize reduction 37, result has 33.9 percent of original size [2022-11-03 01:50:27,292 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 2 case distinctions, treesize of input 686 treesize of output 687 [2022-11-03 01:50:27,323 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:50:27,386 INFO L356 Elim1Store]: treesize reduction 37, result has 33.9 percent of original size [2022-11-03 01:50:27,386 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 2 case distinctions, treesize of input 680 treesize of output 681 [2022-11-03 01:50:27,421 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-03 01:50:27,478 INFO L356 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-11-03 01:50:27,478 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 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 661 treesize of output 642 [2022-11-03 01:50:28,103 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-03 01:50:28,104 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-03 01:50:28,127 INFO L356 Elim1Store]: treesize reduction 27, result has 25.0 percent of original size [2022-11-03 01:50:28,127 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 2 new quantified variables, introduced 2 case distinctions, treesize of input 373 treesize of output 366 [2022-11-03 01:50:28,155 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-03 01:50:28,156 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-03 01:50:28,180 INFO L356 Elim1Store]: treesize reduction 33, result has 31.3 percent of original size [2022-11-03 01:50:28,181 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 2 new quantified variables, introduced 2 case distinctions, treesize of input 415 treesize of output 408 [2022-11-03 01:50:28,207 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:50:28,209 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:50:28,210 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:50:28,211 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-03 01:50:28,223 INFO L356 Elim1Store]: treesize reduction 36, result has 2.7 percent of original size [2022-11-03 01:50:28,223 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 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 5 case distinctions, treesize of input 497 treesize of output 482 [2022-11-03 01:50:28,348 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:50:28,428 INFO L356 Elim1Store]: treesize reduction 170, result has 13.7 percent of original size [2022-11-03 01:50:28,429 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 3 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 13 case distinctions, treesize of input 482 treesize of output 478 [2022-11-03 01:50:28,668 INFO L356 Elim1Store]: treesize reduction 19, result has 47.2 percent of original size [2022-11-03 01:50:28,669 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 346 treesize of output 353 [2022-11-03 01:50:28,727 INFO L356 Elim1Store]: treesize reduction 19, result has 47.2 percent of original size [2022-11-03 01:50:28,728 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 340 treesize of output 347 [2022-11-03 01:50:28,750 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:50:28,752 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:50:28,762 INFO L356 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2022-11-03 01:50:28,762 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 3 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 340 treesize of output 322 [2022-11-03 01:50:29,022 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:50:29,072 INFO L356 Elim1Store]: treesize reduction 37, result has 33.9 percent of original size [2022-11-03 01:50:29,072 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 2 case distinctions, treesize of input 686 treesize of output 687 [2022-11-03 01:50:29,098 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-03 01:50:29,145 INFO L356 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-11-03 01:50:29,145 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 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 667 treesize of output 648 [2022-11-03 01:50:29,181 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:50:29,229 INFO L356 Elim1Store]: treesize reduction 37, result has 33.9 percent of original size [2022-11-03 01:50:29,230 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 2 case distinctions, treesize of input 672 treesize of output 673 [2022-11-03 01:50:29,761 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-03 01:50:29,762 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-03 01:50:29,784 INFO L356 Elim1Store]: treesize reduction 25, result has 21.9 percent of original size [2022-11-03 01:50:29,785 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 2 new quantified variables, introduced 2 case distinctions, treesize of input 352 treesize of output 345 [2022-11-03 01:50:29,809 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:50:29,810 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:50:29,811 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:50:29,813 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-03 01:50:29,824 INFO L356 Elim1Store]: treesize reduction 24, result has 4.0 percent of original size [2022-11-03 01:50:29,826 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 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 5 case distinctions, treesize of input 368 treesize of output 353 [2022-11-03 01:50:29,851 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-03 01:50:29,853 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-03 01:50:29,873 INFO L356 Elim1Store]: treesize reduction 25, result has 21.9 percent of original size [2022-11-03 01:50:29,873 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 2 new quantified variables, introduced 2 case distinctions, treesize of input 364 treesize of output 357 [2022-11-03 01:50:30,326 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 [2022-11-03 01:50:30,336 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 [2022-11-03 01:50:30,339 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 01:50:35,698 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4167#(and (<= 1 |ULTIMATE.start_main_~i~0#1|) (<= 1 |ULTIMATE.start_sll_create_#in~data#1|) (<= 0 |ULTIMATE.start_sll_remove_last_~head#1.offset|) (<= |ULTIMATE.start_sll_create_#in~data#1| 1) (<= |ULTIMATE.start_sll_create_~head~0#1.offset| 0) (<= 0 |ULTIMATE.start_sll_remove_last_~head#1.base|) (<= |ULTIMATE.start_sll_create_~len#1| 0) (<= |ULTIMATE.start_sll_create_#res#1.offset| 0) (<= |ULTIMATE.start_sll_remove_last_~head#1.offset| 0) (<= 0 |ULTIMATE.start_sll_remove_last_#in~head#1.offset|) (<= 1 |ULTIMATE.start_sll_create_~data#1|) (= |ULTIMATE.start_main_~data~0#1| 1) (<= |ULTIMATE.start_sll_create_~data#1| 1) (<= |ULTIMATE.start_sll_create_#in~len#1| 2) (= |ULTIMATE.start_main_~#s~0#1.offset| 0) (<= 0 |ULTIMATE.start_sll_create_~len#1|) (= |ULTIMATE.start_main_~len~0#1| 2) (= |#NULL.offset| 0) (<= |ULTIMATE.start_sll_remove_last_#in~head#1.offset| 0) (<= 0 |ULTIMATE.start_main_~#s~0#1.base|) (<= 0 (+ |ULTIMATE.start_sll_remove_last_~last~0#1.offset| 4)) (<= 0 |ULTIMATE.start_sll_create_#res#1.offset|) (<= 0 (+ |ULTIMATE.start_sll_remove_last_~snd_to_last~0#1.offset| 4)) (<= |ULTIMATE.start_main_~i~0#1| 1) (<= 0 |#StackHeapBarrier|) (<= 2 |ULTIMATE.start_sll_create_#in~len#1|) (< (select |#length| |ULTIMATE.start_sll_remove_last_~snd_to_last~0#1.base|) (+ |ULTIMATE.start_sll_remove_last_~snd_to_last~0#1.offset| 8)) (<= 0 |ULTIMATE.start_sll_create_~head~0#1.offset|) (= |#NULL.base| 0) (<= 0 |ULTIMATE.start_sll_remove_last_#in~head#1.base|))' at error location [2022-11-03 01:50:35,698 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 01:50:35,698 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 01:50:35,698 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 3, 3] total 10 [2022-11-03 01:50:35,698 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [337063972] [2022-11-03 01:50:35,698 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 01:50:35,699 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2022-11-03 01:50:35,699 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 01:50:35,699 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2022-11-03 01:50:35,699 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=80, Invalid=472, Unknown=0, NotChecked=0, Total=552 [2022-11-03 01:50:35,700 INFO L87 Difference]: Start difference. First operand 63 states and 70 transitions. Second operand has 11 states, 10 states have (on average 3.5) internal successors, (35), 11 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) [2022-11-03 01:50:36,462 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 01:50:36,463 INFO L93 Difference]: Finished difference Result 96 states and 103 transitions. [2022-11-03 01:50:36,466 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2022-11-03 01:50:36,466 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 10 states have (on average 3.5) internal successors, (35), 11 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) Word has length 23 [2022-11-03 01:50:36,466 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 01:50:36,467 INFO L225 Difference]: With dead ends: 96 [2022-11-03 01:50:36,467 INFO L226 Difference]: Without dead ends: 96 [2022-11-03 01:50:36,468 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 92 GetRequests, 56 SyntacticMatches, 0 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 283 ImplicationChecksByTransitivity, 5.9s TimeCoverageRelationStatistics Valid=253, Invalid=1153, Unknown=0, NotChecked=0, Total=1406 [2022-11-03 01:50:36,468 INFO L413 NwaCegarLoop]: 23 mSDtfsCounter, 296 mSDsluCounter, 110 mSDsCounter, 0 mSdLazyCounter, 236 mSolverCounterSat, 46 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 296 SdHoareTripleChecker+Valid, 115 SdHoareTripleChecker+Invalid, 282 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 46 IncrementalHoareTripleChecker+Valid, 236 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-03 01:50:36,469 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [296 Valid, 115 Invalid, 282 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [46 Valid, 236 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-03 01:50:36,469 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 96 states. [2022-11-03 01:50:36,471 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 96 to 62. [2022-11-03 01:50:36,471 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 62 states, 49 states have (on average 1.3877551020408163) internal successors, (68), 61 states have internal predecessors, (68), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 01:50:36,472 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 68 transitions. [2022-11-03 01:50:36,472 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 68 transitions. Word has length 23 [2022-11-03 01:50:36,472 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 01:50:36,472 INFO L495 AbstractCegarLoop]: Abstraction has 62 states and 68 transitions. [2022-11-03 01:50:36,472 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 10 states have (on average 3.5) internal successors, (35), 11 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) [2022-11-03 01:50:36,473 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 68 transitions. [2022-11-03 01:50:36,473 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2022-11-03 01:50:36,473 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 01:50:36,473 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 01:50:36,502 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_051627c3-84bf-4ee4-b3b2-b2dd844ae3af/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2022-11-03 01:50:36,678 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_051627c3-84bf-4ee4-b3b2-b2dd844ae3af/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable21 [2022-11-03 01:50:36,678 INFO L420 AbstractCegarLoop]: === Iteration 23 === Targeting ULTIMATE.startErr25ASSERT_VIOLATIONMEMORY_FREE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 29 more)] === [2022-11-03 01:50:36,679 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 01:50:36,679 INFO L85 PathProgramCache]: Analyzing trace with hash -1389037381, now seen corresponding path program 1 times [2022-11-03 01:50:36,679 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 01:50:36,679 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1804683936] [2022-11-03 01:50:36,679 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 01:50:36,679 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 01:50:36,704 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 01:50:37,223 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 7 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 01:50:37,223 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 01:50:37,223 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1804683936] [2022-11-03 01:50:37,224 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1804683936] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 01:50:37,224 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [314832504] [2022-11-03 01:50:37,224 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 01:50:37,224 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 01:50:37,225 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_051627c3-84bf-4ee4-b3b2-b2dd844ae3af/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 01:50:37,226 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_051627c3-84bf-4ee4-b3b2-b2dd844ae3af/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 01:50:37,267 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_051627c3-84bf-4ee4-b3b2-b2dd844ae3af/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2022-11-03 01:50:37,448 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 01:50:37,451 INFO L263 TraceCheckSpWp]: Trace formula consists of 309 conjuncts, 49 conjunts are in the unsatisfiable core [2022-11-03 01:50:37,454 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 01:50:37,549 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2022-11-03 01:50:37,655 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 13 treesize of output 9 [2022-11-03 01:50:37,861 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 18 [2022-11-03 01:50:37,933 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 [2022-11-03 01:50:38,026 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:50:38,036 INFO L356 Elim1Store]: treesize reduction 20, result has 13.0 percent of original size [2022-11-03 01:50:38,036 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 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 3 case distinctions, treesize of input 33 treesize of output 16 [2022-11-03 01:50:38,056 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 2 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 01:50:38,057 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 01:50:38,255 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 34 treesize of output 22 [2022-11-03 01:50:38,338 INFO L356 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-03 01:50:38,338 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 80 treesize of output 82 [2022-11-03 01:50:38,357 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 16 [2022-11-03 01:50:38,380 INFO L356 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-03 01:50:38,380 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 78 treesize of output 80 [2022-11-03 01:50:38,784 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 2 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 01:50:38,784 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [314832504] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 01:50:38,784 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [625757153] [2022-11-03 01:50:38,786 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2022-11-03 01:50:38,787 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 01:50:38,787 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 01:50:38,787 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 01:50:38,787 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 01:50:38,808 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:50:38,809 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:50:38,809 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 [2022-11-03 01:50:38,836 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:50:38,837 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:50:38,839 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:50:38,840 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:50:38,842 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:50:38,843 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 [2022-11-03 01:50:38,874 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 13 treesize of output 9 [2022-11-03 01:50:38,887 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:50:38,888 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 34 treesize of output 21 [2022-11-03 01:50:38,904 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 13 treesize of output 9 [2022-11-03 01:50:38,937 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:50:38,939 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:50:38,940 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 26 treesize of output 28 [2022-11-03 01:50:38,959 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:50:38,960 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 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 25 treesize of output 13 [2022-11-03 01:50:38,978 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:50:38,979 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 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 25 treesize of output 13 [2022-11-03 01:50:39,014 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-03 01:50:39,015 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 13 [2022-11-03 01:50:39,029 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:50:39,030 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:50:39,032 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:50:39,033 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 41 treesize of output 31 [2022-11-03 01:50:39,051 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-03 01:50:39,052 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 13 [2022-11-03 01:50:39,105 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:50:39,107 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:50:39,108 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:50:39,110 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:50:39,111 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:50:39,113 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:50:39,114 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:50:39,116 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:50:39,118 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:50:39,119 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 13 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 0 case distinctions, treesize of input 34 treesize of output 43 [2022-11-03 01:50:39,235 INFO L356 Elim1Store]: treesize reduction 19, result has 47.2 percent of original size [2022-11-03 01:50:39,235 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 339 treesize of output 346 [2022-11-03 01:50:39,253 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:50:39,254 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:50:39,263 INFO L356 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2022-11-03 01:50:39,264 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 3 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 339 treesize of output 321 [2022-11-03 01:50:39,320 INFO L356 Elim1Store]: treesize reduction 19, result has 47.2 percent of original size [2022-11-03 01:50:39,321 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 333 treesize of output 340 [2022-11-03 01:50:39,490 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:50:39,541 INFO L356 Elim1Store]: treesize reduction 37, result has 33.9 percent of original size [2022-11-03 01:50:39,541 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 2 case distinctions, treesize of input 366 treesize of output 367 [2022-11-03 01:50:39,567 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-03 01:50:39,607 INFO L356 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-11-03 01:50:39,608 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 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 347 treesize of output 348 [2022-11-03 01:50:39,630 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:50:39,670 INFO L356 Elim1Store]: treesize reduction 37, result has 33.9 percent of original size [2022-11-03 01:50:39,671 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 2 case distinctions, treesize of input 356 treesize of output 357 [2022-11-03 01:50:40,067 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:50:40,069 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:50:40,070 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:50:40,071 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-03 01:50:40,084 INFO L356 Elim1Store]: treesize reduction 24, result has 4.0 percent of original size [2022-11-03 01:50:40,084 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 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 5 case distinctions, treesize of input 360 treesize of output 345 [2022-11-03 01:50:40,106 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-03 01:50:40,107 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-03 01:50:40,126 INFO L356 Elim1Store]: treesize reduction 25, result has 21.9 percent of original size [2022-11-03 01:50:40,126 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 2 new quantified variables, introduced 2 case distinctions, treesize of input 356 treesize of output 349 [2022-11-03 01:50:40,158 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-03 01:50:40,159 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-03 01:50:40,177 INFO L356 Elim1Store]: treesize reduction 49, result has 21.0 percent of original size [2022-11-03 01:50:40,177 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 2 new quantified variables, introduced 2 case distinctions, treesize of input 434 treesize of output 427 [2022-11-03 01:50:40,315 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:50:40,400 INFO L356 Elim1Store]: treesize reduction 170, result has 13.7 percent of original size [2022-11-03 01:50:40,401 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 3 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 13 case distinctions, treesize of input 435 treesize of output 439 [2022-11-03 01:50:40,604 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:50:40,605 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:50:40,613 INFO L356 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2022-11-03 01:50:40,613 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 3 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 345 treesize of output 327 [2022-11-03 01:50:40,662 INFO L356 Elim1Store]: treesize reduction 19, result has 47.2 percent of original size [2022-11-03 01:50:40,662 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 339 treesize of output 346 [2022-11-03 01:50:40,717 INFO L356 Elim1Store]: treesize reduction 19, result has 47.2 percent of original size [2022-11-03 01:50:40,717 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 333 treesize of output 340 [2022-11-03 01:50:41,194 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:50:41,251 INFO L356 Elim1Store]: treesize reduction 37, result has 33.9 percent of original size [2022-11-03 01:50:41,251 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 2 case distinctions, treesize of input 1168 treesize of output 1163 [2022-11-03 01:50:41,290 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-03 01:50:41,358 INFO L356 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-11-03 01:50:41,358 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 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 1143 treesize of output 1092 [2022-11-03 01:50:41,415 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:50:41,468 INFO L356 Elim1Store]: treesize reduction 37, result has 33.9 percent of original size [2022-11-03 01:50:41,469 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 2 case distinctions, treesize of input 1140 treesize of output 1135 [2022-11-03 01:50:42,278 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-03 01:50:42,279 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-03 01:50:42,299 INFO L356 Elim1Store]: treesize reduction 27, result has 25.0 percent of original size [2022-11-03 01:50:42,299 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 2 new quantified variables, introduced 2 case distinctions, treesize of input 348 treesize of output 341 [2022-11-03 01:50:42,322 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-03 01:50:42,323 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-03 01:50:42,345 INFO L356 Elim1Store]: treesize reduction 33, result has 31.3 percent of original size [2022-11-03 01:50:42,345 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 2 new quantified variables, introduced 2 case distinctions, treesize of input 372 treesize of output 365 [2022-11-03 01:50:42,368 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:50:42,375 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:50:42,377 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 01:50:42,378 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-03 01:50:42,388 INFO L356 Elim1Store]: treesize reduction 36, result has 2.7 percent of original size [2022-11-03 01:50:42,389 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 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 5 case distinctions, treesize of input 436 treesize of output 421 [2022-11-03 01:50:42,814 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 13 treesize of output 9 [2022-11-03 01:50:42,829 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 13 treesize of output 9 [2022-11-03 01:50:42,847 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 19 treesize of output 1 [2022-11-03 01:50:42,883 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 [2022-11-03 01:50:42,893 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 [2022-11-03 01:50:42,896 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 01:50:50,076 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4536#(and (<= 1 |ULTIMATE.start_main_~i~0#1|) (<= 1 |ULTIMATE.start_sll_create_#in~data#1|) (<= 0 |ULTIMATE.start_sll_remove_last_~head#1.offset|) (not (= |ULTIMATE.start_sll_remove_last_~last~0#1.offset| 0)) (<= |ULTIMATE.start_sll_create_#in~data#1| 1) (<= |ULTIMATE.start_sll_create_~head~0#1.offset| 0) (<= 0 |ULTIMATE.start_sll_remove_last_~head#1.base|) (<= |ULTIMATE.start_sll_create_~len#1| 0) (<= |ULTIMATE.start_sll_create_#res#1.offset| 0) (<= |ULTIMATE.start_sll_remove_last_~head#1.offset| 0) (<= 0 |ULTIMATE.start_sll_remove_last_#in~head#1.offset|) (= (select (select |#memory_$Pointer$.base| |ULTIMATE.start_sll_remove_last_~snd_to_last~0#1.base|) (+ |ULTIMATE.start_sll_remove_last_~snd_to_last~0#1.offset| 4)) 0) (<= 1 |ULTIMATE.start_sll_create_~data#1|) (= |ULTIMATE.start_main_~data~0#1| 1) (<= |ULTIMATE.start_sll_create_~data#1| 1) (<= (+ |ULTIMATE.start_sll_remove_last_~snd_to_last~0#1.offset| 8) (select |#length| |ULTIMATE.start_sll_remove_last_~snd_to_last~0#1.base|)) (<= |ULTIMATE.start_sll_create_#in~len#1| 2) (= |ULTIMATE.start_main_~#s~0#1.offset| 0) (<= 0 |ULTIMATE.start_sll_create_~len#1|) (= |ULTIMATE.start_main_~len~0#1| 2) (= |#NULL.offset| 0) (<= |ULTIMATE.start_sll_remove_last_#in~head#1.offset| 0) (<= 0 |ULTIMATE.start_main_~#s~0#1.base|) (<= 0 (+ |ULTIMATE.start_sll_remove_last_~last~0#1.offset| 4)) (<= 0 |ULTIMATE.start_sll_create_#res#1.offset|) (<= 0 (+ |ULTIMATE.start_sll_remove_last_~snd_to_last~0#1.offset| 4)) (<= |ULTIMATE.start_main_~i~0#1| 1) (= (select (select |#memory_$Pointer$.offset| |ULTIMATE.start_sll_remove_last_~snd_to_last~0#1.base|) (+ |ULTIMATE.start_sll_remove_last_~snd_to_last~0#1.offset| 4)) 0) (<= 0 |#StackHeapBarrier|) (<= 2 |ULTIMATE.start_sll_create_#in~len#1|) (<= 0 |ULTIMATE.start_sll_create_~head~0#1.offset|) (= |#NULL.base| 0) (= (select |#valid| |ULTIMATE.start_sll_remove_last_~snd_to_last~0#1.base|) 1) (<= 0 |ULTIMATE.start_sll_remove_last_#in~head#1.base|))' at error location [2022-11-03 01:50:50,076 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 01:50:50,076 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 01:50:50,077 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 12, 12] total 28 [2022-11-03 01:50:50,077 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1084211766] [2022-11-03 01:50:50,077 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 01:50:50,077 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 29 states [2022-11-03 01:50:50,077 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 01:50:50,078 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2022-11-03 01:50:50,078 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=207, Invalid=1599, Unknown=0, NotChecked=0, Total=1806 [2022-11-03 01:50:50,078 INFO L87 Difference]: Start difference. First operand 62 states and 68 transitions. Second operand has 29 states, 28 states have (on average 2.0) internal successors, (56), 29 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) [2022-11-03 01:50:50,767 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 01:50:50,767 INFO L93 Difference]: Finished difference Result 74 states and 81 transitions. [2022-11-03 01:50:50,767 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2022-11-03 01:50:50,767 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 28 states have (on average 2.0) internal successors, (56), 29 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 [2022-11-03 01:50:50,768 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 01:50:50,768 INFO L225 Difference]: With dead ends: 74 [2022-11-03 01:50:50,768 INFO L226 Difference]: Without dead ends: 74 [2022-11-03 01:50:50,770 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 89 GetRequests, 40 SyntacticMatches, 0 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 508 ImplicationChecksByTransitivity, 8.3s TimeCoverageRelationStatistics Valid=342, Invalid=2208, Unknown=0, NotChecked=0, Total=2550 [2022-11-03 01:50:50,770 INFO L413 NwaCegarLoop]: 34 mSDtfsCounter, 43 mSDsluCounter, 717 mSDsCounter, 0 mSdLazyCounter, 292 mSolverCounterSat, 17 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 43 SdHoareTripleChecker+Valid, 660 SdHoareTripleChecker+Invalid, 457 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 17 IncrementalHoareTripleChecker+Valid, 292 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 148 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-03 01:50:50,770 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [43 Valid, 660 Invalid, 457 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [17 Valid, 292 Invalid, 0 Unknown, 148 Unchecked, 0.2s Time] [2022-11-03 01:50:50,771 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 74 states. [2022-11-03 01:50:50,772 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 74 to 65. [2022-11-03 01:50:50,773 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 65 states, 52 states have (on average 1.3846153846153846) internal successors, (72), 64 states have internal predecessors, (72), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 01:50:50,773 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 72 transitions. [2022-11-03 01:50:50,774 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 72 transitions. Word has length 24 [2022-11-03 01:50:50,774 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 01:50:50,774 INFO L495 AbstractCegarLoop]: Abstraction has 65 states and 72 transitions. [2022-11-03 01:50:50,774 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 29 states, 28 states have (on average 2.0) internal successors, (56), 29 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) [2022-11-03 01:50:50,775 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 72 transitions. [2022-11-03 01:50:50,775 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2022-11-03 01:50:50,775 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 01:50:50,775 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 01:50:50,807 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_051627c3-84bf-4ee4-b3b2-b2dd844ae3af/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Ended with exit code 0 [2022-11-03 01:50:50,986 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_051627c3-84bf-4ee4-b3b2-b2dd844ae3af/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable22 [2022-11-03 01:50:50,986 INFO L420 AbstractCegarLoop]: === Iteration 24 === Targeting ULTIMATE.startErr20REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 29 more)] === [2022-11-03 01:50:50,987 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 01:50:50,987 INFO L85 PathProgramCache]: Analyzing trace with hash -1389034297, now seen corresponding path program 2 times [2022-11-03 01:50:50,987 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 01:50:50,987 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1919090871] [2022-11-03 01:50:50,987 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 01:50:50,988 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 01:50:51,018 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 01:50:52,494 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 3 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 01:50:52,494 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 01:50:52,494 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1919090871] [2022-11-03 01:50:52,494 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1919090871] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 01:50:52,494 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1614619558] [2022-11-03 01:50:52,495 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-03 01:50:52,495 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 01:50:52,495 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_051627c3-84bf-4ee4-b3b2-b2dd844ae3af/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 01:50:52,496 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_051627c3-84bf-4ee4-b3b2-b2dd844ae3af/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 01:50:52,510 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_051627c3-84bf-4ee4-b3b2-b2dd844ae3af/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2022-11-03 01:50:52,720 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2022-11-03 01:50:52,720 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 01:50:52,724 INFO L263 TraceCheckSpWp]: Trace formula consists of 302 conjuncts, 91 conjunts are in the unsatisfiable core [2022-11-03 01:50:52,727 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 01:50:52,873 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 13 treesize of output 9 [2022-11-03 01:50:52,880 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 13 treesize of output 9 [2022-11-03 01:50:52,949 INFO L356 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2022-11-03 01:50:52,949 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 [2022-11-03 01:50:53,038 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 16 treesize of output 18 [2022-11-03 01:50:53,050 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 16 treesize of output 18 [2022-11-03 01:50:53,067 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 16 treesize of output 18 [2022-11-03 01:50:53,075 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 16 treesize of output 18 [2022-11-03 01:50:53,133 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 21 treesize of output 20 [2022-11-03 01:50:53,141 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 27 treesize of output 26 [2022-11-03 01:50:53,717 INFO L356 Elim1Store]: treesize reduction 74, result has 3.9 percent of original size [2022-11-03 01:50:53,717 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 6 new quantified variables, introduced 6 case distinctions, treesize of input 125 treesize of output 56 [2022-11-03 01:50:53,808 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 3 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 01:50:53,809 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 01:50:56,263 WARN L833 $PredicateComparison]: unable to prove that (let ((.cse5 (select |c_#memory_$Pointer$.base| |c_ULTIMATE.start_sll_create_~new_head~0#1.base|)) (.cse7 (select |c_#memory_$Pointer$.offset| |c_ULTIMATE.start_sll_create_~new_head~0#1.base|))) (and (forall ((|ULTIMATE.start_sll_create_~new_head~0#1.offset| Int) (|ULTIMATE.start_main_~#s~0#1.base| Int)) (let ((.cse6 (+ 4 |ULTIMATE.start_sll_create_~new_head~0#1.offset|))) (let ((.cse4 (store |c_#memory_$Pointer$.offset| |c_ULTIMATE.start_sll_create_~new_head~0#1.base| (store .cse7 .cse6 |c_ULTIMATE.start_sll_create_~head~0#1.offset|))) (.cse2 (store |c_#memory_$Pointer$.base| |c_ULTIMATE.start_sll_create_~new_head~0#1.base| (store .cse5 .cse6 |c_ULTIMATE.start_sll_create_~head~0#1.base|)))) (let ((.cse0 (select (select .cse2 |ULTIMATE.start_main_~#s~0#1.base|) |c_ULTIMATE.start_main_~#s~0#1.offset|)) (.cse1 (select (select .cse4 |ULTIMATE.start_main_~#s~0#1.base|) |c_ULTIMATE.start_main_~#s~0#1.offset|))) (or (not (= |c_ULTIMATE.start_sll_create_~new_head~0#1.base| .cse0)) (not (= .cse1 |ULTIMATE.start_sll_create_~new_head~0#1.offset|)) (= (let ((.cse3 (+ .cse1 4))) (select (select .cse2 (select (select .cse2 .cse0) .cse3)) (+ (select (select .cse4 .cse0) .cse3) 4))) 0)))))) (forall ((|ULTIMATE.start_sll_create_~new_head~0#1.offset| Int) (|ULTIMATE.start_main_~#s~0#1.base| Int)) (let ((.cse13 (+ 4 |ULTIMATE.start_sll_create_~new_head~0#1.offset|))) (let ((.cse8 (store |c_#memory_$Pointer$.offset| |c_ULTIMATE.start_sll_create_~new_head~0#1.base| (store .cse7 .cse13 |c_ULTIMATE.start_sll_create_~head~0#1.offset|))) (.cse9 (store |c_#memory_$Pointer$.base| |c_ULTIMATE.start_sll_create_~new_head~0#1.base| (store .cse5 .cse13 |c_ULTIMATE.start_sll_create_~head~0#1.base|)))) (let ((.cse10 (select (select .cse9 |ULTIMATE.start_main_~#s~0#1.base|) |c_ULTIMATE.start_main_~#s~0#1.offset|)) (.cse12 (select (select .cse8 |ULTIMATE.start_main_~#s~0#1.base|) |c_ULTIMATE.start_main_~#s~0#1.offset|))) (or (= (let ((.cse11 (+ .cse12 4))) (select (select .cse8 (select (select .cse9 .cse10) .cse11)) (+ (select (select .cse8 .cse10) .cse11) 4))) 0) (not (= |c_ULTIMATE.start_sll_create_~new_head~0#1.base| .cse10)) (not (= .cse12 |ULTIMATE.start_sll_create_~new_head~0#1.offset|))))))))) is different from false [2022-11-03 01:50:56,304 INFO L356 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-03 01:50:56,305 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 110 treesize of output 93 [2022-11-03 01:50:56,314 INFO L356 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-03 01:50:56,315 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 90 treesize of output 78 [2022-11-03 01:50:56,339 INFO L356 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-03 01:50:56,340 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 110 treesize of output 98 [2022-11-03 01:50:56,347 INFO L356 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-03 01:50:56,348 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 95 treesize of output 78 [2022-11-03 01:50:56,366 WARN L833 $PredicateComparison]: unable to prove that (and (forall ((v_arrayElimArr_4 (Array Int Int)) (v_arrayElimArr_3 (Array Int Int)) (|ULTIMATE.start_main_~#s~0#1.base| Int)) (let ((.cse0 (store |c_#memory_$Pointer$.offset| |c_ULTIMATE.start_node_create_~temp~0#1.base| v_arrayElimArr_4)) (.cse1 (store |c_#memory_$Pointer$.base| |c_ULTIMATE.start_node_create_~temp~0#1.base| v_arrayElimArr_3))) (let ((.cse2 (select (select .cse1 |ULTIMATE.start_main_~#s~0#1.base|) |c_ULTIMATE.start_main_~#s~0#1.offset|)) (.cse3 (+ (select (select .cse0 |ULTIMATE.start_main_~#s~0#1.base|) |c_ULTIMATE.start_main_~#s~0#1.offset|) 4))) (or (= (select (select .cse0 (select (select .cse1 .cse2) .cse3)) (+ (select (select .cse0 .cse2) .cse3) 4)) 0) (not (= |c_ULTIMATE.start_node_create_~temp~0#1.base| .cse2)) (not (= (select v_arrayElimArr_4 .cse3) |c_ULTIMATE.start_sll_create_~head~0#1.offset|)) (not (= |c_ULTIMATE.start_sll_create_~head~0#1.base| (select v_arrayElimArr_3 .cse3))))))) (forall ((v_arrayElimArr_2 (Array Int Int)) (v_arrayElimArr_1 (Array Int Int)) (|ULTIMATE.start_main_~#s~0#1.base| Int)) (let ((.cse7 (store |c_#memory_$Pointer$.offset| |c_ULTIMATE.start_node_create_~temp~0#1.base| v_arrayElimArr_2)) (.cse4 (store |c_#memory_$Pointer$.base| |c_ULTIMATE.start_node_create_~temp~0#1.base| v_arrayElimArr_1))) (let ((.cse5 (select (select .cse4 |ULTIMATE.start_main_~#s~0#1.base|) |c_ULTIMATE.start_main_~#s~0#1.offset|)) (.cse6 (+ (select (select .cse7 |ULTIMATE.start_main_~#s~0#1.base|) |c_ULTIMATE.start_main_~#s~0#1.offset|) 4))) (or (= (select (select .cse4 (select (select .cse4 .cse5) .cse6)) (+ (select (select .cse7 .cse5) .cse6) 4)) 0) (not (= |c_ULTIMATE.start_node_create_~temp~0#1.base| .cse5)) (not (= (select v_arrayElimArr_1 .cse6) |c_ULTIMATE.start_sll_create_~head~0#1.base|)) (not (= (select v_arrayElimArr_2 .cse6) |c_ULTIMATE.start_sll_create_~head~0#1.offset|))))))) is different from false [2022-11-03 01:50:56,670 INFO L356 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-03 01:50:56,670 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 413 treesize of output 334 [2022-11-03 01:50:56,680 INFO L356 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-03 01:50:56,680 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 323 treesize of output 224 [2022-11-03 01:50:58,767 INFO L356 Elim1Store]: treesize reduction 106, result has 92.7 percent of original size [2022-11-03 01:50:58,768 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 11 select indices, 11 select index equivalence classes, 0 disjoint index pairs (out of 55 index pairs), introduced 16 new quantified variables, introduced 55 case distinctions, treesize of input 816 treesize of output 1897 [2022-11-03 01:51:35,320 WARN L234 SmtUtils]: Spent 36.33s on a formula simplification. DAG size of input: 1079 DAG size of output: 935 (called from [L 353] de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.arrays.Elim1Store.elim1) [2022-11-03 01:51:35,329 INFO L356 Elim1Store]: treesize reduction 820, result has 82.3 percent of original size [2022-11-03 01:51:35,332 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 25 select indices, 25 select index equivalence classes, 0 disjoint index pairs (out of 300 index pairs), introduced 33 new quantified variables, introduced 300 case distinctions, treesize of input 6699 treesize of output 8656 [2022-11-03 01:51:40,529 INFO L356 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-03 01:51:40,530 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 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 4189 treesize of output 3635 [2022-11-03 01:51:42,316 INFO L244 Elim1Store]: Index analysis took 107 ms [2022-11-03 01:51:44,178 INFO L356 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-03 01:51:44,181 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 9 select indices, 9 select index equivalence classes, 0 disjoint index pairs (out of 36 index pairs), introduced 12 new quantified variables, introduced 36 case distinctions, treesize of input 4679 treesize of output 4349 [2022-11-03 01:51:48,602 INFO L356 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-03 01:51:48,603 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 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 908 treesize of output 926 [2022-11-03 01:51:52,933 INFO L356 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-03 01:51:52,935 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 4 new quantified variables, introduced 3 case distinctions, treesize of input 5051 treesize of output 4549 [2022-11-03 01:51:57,674 INFO L244 Elim1Store]: Index analysis took 540 ms [2022-11-03 01:52:01,621 INFO L356 Elim1Store]: treesize reduction 8, result has 97.5 percent of original size [2022-11-03 01:52:01,622 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 9 select indices, 9 select index equivalence classes, 0 disjoint index pairs (out of 36 index pairs), introduced 9 new quantified variables, introduced 36 case distinctions, treesize of input 3831 treesize of output 3763