./Ultimate.py --spec ../../sv-benchmarks/c/properties/valid-memsafety.prp --file ../../sv-benchmarks/c/list-ext-properties/list-ext_1.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for memory safety (deref-memtrack) Using default analysis Version e7bb482b 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_e6d197e6-15be-4c65-afca-81dca8796916/bin/utaipan-verify-FOvIYxoinp/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e6d197e6-15be-4c65-afca-81dca8796916/bin/utaipan-verify-FOvIYxoinp/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e6d197e6-15be-4c65-afca-81dca8796916/bin/utaipan-verify-FOvIYxoinp/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e6d197e6-15be-4c65-afca-81dca8796916/bin/utaipan-verify-FOvIYxoinp/config/TaipanMemDerefMemtrack.xml -i ../../sv-benchmarks/c/list-ext-properties/list-ext_1.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e6d197e6-15be-4c65-afca-81dca8796916/bin/utaipan-verify-FOvIYxoinp/config/svcomp-DerefFreeMemtrack-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e6d197e6-15be-4c65-afca-81dca8796916/bin/utaipan-verify-FOvIYxoinp --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 e978ccdde62c7126e7c77a584896efdc6e7afe04b6752d127d7236cecdea192f --- Real Ultimate output --- This is Ultimate 0.2.3-dev-e7bb482 [2023-11-06 21:04:12,038 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-11-06 21:04:12,189 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e6d197e6-15be-4c65-afca-81dca8796916/bin/utaipan-verify-FOvIYxoinp/config/svcomp-DerefFreeMemtrack-32bit-Taipan_Default.epf [2023-11-06 21:04:12,198 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-11-06 21:04:12,199 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-11-06 21:04:12,245 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-11-06 21:04:12,246 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-11-06 21:04:12,247 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-11-06 21:04:12,248 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-11-06 21:04:12,253 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-11-06 21:04:12,254 INFO L153 SettingsManager]: * User list type=DISABLED [2023-11-06 21:04:12,254 INFO L151 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-11-06 21:04:12,255 INFO L153 SettingsManager]: * Explicit value domain=true [2023-11-06 21:04:12,257 INFO L153 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-11-06 21:04:12,257 INFO L153 SettingsManager]: * Octagon Domain=false [2023-11-06 21:04:12,258 INFO L153 SettingsManager]: * Abstract domain=CompoundDomain [2023-11-06 21:04:12,258 INFO L153 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-11-06 21:04:12,260 INFO L153 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-11-06 21:04:12,261 INFO L153 SettingsManager]: * Interval Domain=false [2023-11-06 21:04:12,261 INFO L151 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-11-06 21:04:12,262 INFO L153 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-11-06 21:04:12,262 INFO L153 SettingsManager]: * Simplification Technique=POLY_PAC [2023-11-06 21:04:12,263 INFO L151 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2023-11-06 21:04:12,264 INFO L153 SettingsManager]: * Create parallel compositions if possible=false [2023-11-06 21:04:12,265 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-11-06 21:04:12,265 INFO L153 SettingsManager]: * sizeof long=4 [2023-11-06 21:04:12,266 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-11-06 21:04:12,266 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-11-06 21:04:12,267 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-11-06 21:04:12,267 INFO L153 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2023-11-06 21:04:12,268 INFO L153 SettingsManager]: * Bitprecise bitfields=true [2023-11-06 21:04:12,269 INFO L153 SettingsManager]: * SV-COMP memtrack compatibility mode=true [2023-11-06 21:04:12,269 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-11-06 21:04:12,269 INFO L153 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2023-11-06 21:04:12,270 INFO L153 SettingsManager]: * Check unreachability of reach_error function=false [2023-11-06 21:04:12,270 INFO L153 SettingsManager]: * sizeof long double=12 [2023-11-06 21:04:12,270 INFO L153 SettingsManager]: * Use constant arrays=true [2023-11-06 21:04:12,271 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-11-06 21:04:12,271 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-11-06 21:04:12,271 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-06 21:04:12,272 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-11-06 21:04:12,272 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-11-06 21:04:12,273 INFO L153 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-11-06 21:04:12,273 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-11-06 21:04:12,274 INFO L153 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-11-06 21:04:12,274 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-11-06 21:04:12,274 INFO L153 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e6d197e6-15be-4c65-afca-81dca8796916/bin/utaipan-verify-FOvIYxoinp/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e6d197e6-15be-4c65-afca-81dca8796916/bin/utaipan-verify-FOvIYxoinp Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> e978ccdde62c7126e7c77a584896efdc6e7afe04b6752d127d7236cecdea192f [2023-11-06 21:04:12,587 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-11-06 21:04:12,622 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-11-06 21:04:12,627 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-11-06 21:04:12,628 INFO L270 PluginConnector]: Initializing CDTParser... [2023-11-06 21:04:12,630 INFO L274 PluginConnector]: CDTParser initialized [2023-11-06 21:04:12,631 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e6d197e6-15be-4c65-afca-81dca8796916/bin/utaipan-verify-FOvIYxoinp/../../sv-benchmarks/c/list-ext-properties/list-ext_1.i [2023-11-06 21:04:15,792 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-11-06 21:04:16,117 INFO L384 CDTParser]: Found 1 translation units. [2023-11-06 21:04:16,118 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e6d197e6-15be-4c65-afca-81dca8796916/sv-benchmarks/c/list-ext-properties/list-ext_1.i [2023-11-06 21:04:16,133 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e6d197e6-15be-4c65-afca-81dca8796916/bin/utaipan-verify-FOvIYxoinp/data/19a315e4d/f259728268aa448aa1a854bd129d01bc/FLAGdb7b9a2de [2023-11-06 21:04:16,146 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e6d197e6-15be-4c65-afca-81dca8796916/bin/utaipan-verify-FOvIYxoinp/data/19a315e4d/f259728268aa448aa1a854bd129d01bc [2023-11-06 21:04:16,149 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-11-06 21:04:16,151 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-11-06 21:04:16,152 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-11-06 21:04:16,152 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-11-06 21:04:16,157 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-11-06 21:04:16,157 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.11 09:04:16" (1/1) ... [2023-11-06 21:04:16,158 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@720885b1 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 09:04:16, skipping insertion in model container [2023-11-06 21:04:16,158 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.11 09:04:16" (1/1) ... [2023-11-06 21:04:16,199 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-11-06 21:04:16,473 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-06 21:04:16,483 INFO L202 MainTranslator]: Completed pre-run [2023-11-06 21:04:16,527 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-06 21:04:16,561 INFO L206 MainTranslator]: Completed translation [2023-11-06 21:04:16,561 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 09:04:16 WrapperNode [2023-11-06 21:04:16,562 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-11-06 21:04:16,563 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-11-06 21:04:16,563 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-11-06 21:04:16,563 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-11-06 21:04:16,571 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 09:04:16" (1/1) ... [2023-11-06 21:04:16,586 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 09:04:16" (1/1) ... [2023-11-06 21:04:16,611 INFO L138 Inliner]: procedures = 124, calls = 30, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 132 [2023-11-06 21:04:16,613 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-11-06 21:04:16,614 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-11-06 21:04:16,614 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-11-06 21:04:16,614 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-11-06 21:04:16,624 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 09:04:16" (1/1) ... [2023-11-06 21:04:16,625 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 09:04:16" (1/1) ... [2023-11-06 21:04:16,646 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 09:04:16" (1/1) ... [2023-11-06 21:04:16,646 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 09:04:16" (1/1) ... [2023-11-06 21:04:16,659 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 09:04:16" (1/1) ... [2023-11-06 21:04:16,674 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 09:04:16" (1/1) ... [2023-11-06 21:04:16,676 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 09:04:16" (1/1) ... [2023-11-06 21:04:16,678 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 09:04:16" (1/1) ... [2023-11-06 21:04:16,687 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-11-06 21:04:16,688 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-11-06 21:04:16,689 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-11-06 21:04:16,689 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-11-06 21:04:16,690 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 09:04:16" (1/1) ... [2023-11-06 21:04:16,702 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-06 21:04:16,721 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e6d197e6-15be-4c65-afca-81dca8796916/bin/utaipan-verify-FOvIYxoinp/z3 [2023-11-06 21:04:16,743 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e6d197e6-15be-4c65-afca-81dca8796916/bin/utaipan-verify-FOvIYxoinp/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-11-06 21:04:16,781 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e6d197e6-15be-4c65-afca-81dca8796916/bin/utaipan-verify-FOvIYxoinp/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-11-06 21:04:16,792 INFO L130 BoogieDeclarations]: Found specification of procedure myexit [2023-11-06 21:04:16,793 INFO L138 BoogieDeclarations]: Found implementation of procedure myexit [2023-11-06 21:04:16,793 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2023-11-06 21:04:16,793 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2023-11-06 21:04:16,793 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2023-11-06 21:04:16,793 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-11-06 21:04:16,794 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2023-11-06 21:04:16,794 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2023-11-06 21:04:16,795 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-11-06 21:04:16,796 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-11-06 21:04:16,797 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-11-06 21:04:16,797 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-11-06 21:04:16,942 INFO L236 CfgBuilder]: Building ICFG [2023-11-06 21:04:16,944 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2023-11-06 21:04:17,003 INFO L771 $ProcedureCfgBuilder]: dead code at ProgramPoint myexitFINAL: assume true; [2023-11-06 21:04:17,486 INFO L277 CfgBuilder]: Performing block encoding [2023-11-06 21:04:17,543 INFO L297 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-11-06 21:04:17,544 INFO L302 CfgBuilder]: Removed 5 assume(true) statements. [2023-11-06 21:04:17,547 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.11 09:04:17 BoogieIcfgContainer [2023-11-06 21:04:17,547 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-11-06 21:04:17,550 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-11-06 21:04:17,550 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-11-06 21:04:17,554 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-11-06 21:04:17,555 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 06.11 09:04:16" (1/3) ... [2023-11-06 21:04:17,556 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3052de64 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.11 09:04:17, skipping insertion in model container [2023-11-06 21:04:17,557 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 09:04:16" (2/3) ... [2023-11-06 21:04:17,559 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3052de64 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.11 09:04:17, skipping insertion in model container [2023-11-06 21:04:17,559 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.11 09:04:17" (3/3) ... [2023-11-06 21:04:17,561 INFO L112 eAbstractionObserver]: Analyzing ICFG list-ext_1.i [2023-11-06 21:04:17,583 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-11-06 21:04:17,583 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 38 error locations. [2023-11-06 21:04:17,643 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-11-06 21:04:17,652 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;@2850bba4, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-11-06 21:04:17,652 INFO L358 AbstractCegarLoop]: Starting to check reachability of 38 error locations. [2023-11-06 21:04:17,657 INFO L276 IsEmpty]: Start isEmpty. Operand has 83 states, 41 states have (on average 2.292682926829268) internal successors, (94), 81 states have internal predecessors, (94), 3 states have call successors, (3), 1 states have call predecessors, (3), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 21:04:17,665 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2023-11-06 21:04:17,665 INFO L187 NwaCegarLoop]: Found error trace [2023-11-06 21:04:17,666 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2023-11-06 21:04:17,667 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr12REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 35 more)] === [2023-11-06 21:04:17,674 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-11-06 21:04:17,674 INFO L85 PathProgramCache]: Analyzing trace with hash -1992725426, now seen corresponding path program 1 times [2023-11-06 21:04:17,685 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-06 21:04:17,686 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [422453655] [2023-11-06 21:04:17,687 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 21:04:17,687 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-06 21:04:17,821 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 21:04:17,894 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-06 21:04:17,895 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-06 21:04:17,895 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [422453655] [2023-11-06 21:04:17,896 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [422453655] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-06 21:04:17,896 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-06 21:04:17,896 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-11-06 21:04:17,898 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1553229506] [2023-11-06 21:04:17,900 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-06 21:04:17,904 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2023-11-06 21:04:17,905 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-06 21:04:17,954 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2023-11-06 21:04:17,955 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2023-11-06 21:04:17,959 INFO L87 Difference]: Start difference. First operand has 83 states, 41 states have (on average 2.292682926829268) internal successors, (94), 81 states have internal predecessors, (94), 3 states have call successors, (3), 1 states have call predecessors, (3), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 2 states, 2 states have (on average 3.0) internal successors, (6), 2 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 21:04:18,031 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-06 21:04:18,032 INFO L93 Difference]: Finished difference Result 82 states and 89 transitions. [2023-11-06 21:04:18,033 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2023-11-06 21:04:18,034 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 2 states have (on average 3.0) internal successors, (6), 2 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 6 [2023-11-06 21:04:18,034 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-06 21:04:18,042 INFO L225 Difference]: With dead ends: 82 [2023-11-06 21:04:18,042 INFO L226 Difference]: Without dead ends: 76 [2023-11-06 21:04:18,044 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2023-11-06 21:04:18,049 INFO L413 NwaCegarLoop]: 76 mSDtfsCounter, 0 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 13 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 76 SdHoareTripleChecker+Invalid, 13 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 13 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-06 21:04:18,050 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 76 Invalid, 13 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 13 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-06 21:04:18,070 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2023-11-06 21:04:18,086 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 76. [2023-11-06 21:04:18,087 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 76 states, 38 states have (on average 2.1052631578947367) internal successors, (80), 75 states have internal predecessors, (80), 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) [2023-11-06 21:04:18,089 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 80 transitions. [2023-11-06 21:04:18,090 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 80 transitions. Word has length 6 [2023-11-06 21:04:18,090 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-06 21:04:18,091 INFO L495 AbstractCegarLoop]: Abstraction has 76 states and 80 transitions. [2023-11-06 21:04:18,091 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 3.0) internal successors, (6), 2 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 21:04:18,091 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 80 transitions. [2023-11-06 21:04:18,091 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2023-11-06 21:04:18,091 INFO L187 NwaCegarLoop]: Found error trace [2023-11-06 21:04:18,092 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2023-11-06 21:04:18,092 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-11-06 21:04:18,092 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 35 more)] === [2023-11-06 21:04:18,093 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-11-06 21:04:18,093 INFO L85 PathProgramCache]: Analyzing trace with hash -1992577303, now seen corresponding path program 1 times [2023-11-06 21:04:18,093 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-06 21:04:18,093 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1439192800] [2023-11-06 21:04:18,094 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 21:04:18,094 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-06 21:04:18,115 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 21:04:18,249 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-06 21:04:18,249 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-06 21:04:18,250 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1439192800] [2023-11-06 21:04:18,250 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1439192800] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-06 21:04:18,250 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-06 21:04:18,250 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-11-06 21:04:18,251 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [312977680] [2023-11-06 21:04:18,251 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-06 21:04:18,252 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-11-06 21:04:18,253 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-06 21:04:18,253 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-11-06 21:04:18,254 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-11-06 21:04:18,254 INFO L87 Difference]: Start difference. First operand 76 states and 80 transitions. Second operand has 4 states, 3 states have (on average 2.0) internal successors, (6), 3 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 21:04:18,467 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-06 21:04:18,467 INFO L93 Difference]: Finished difference Result 94 states and 101 transitions. [2023-11-06 21:04:18,467 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-11-06 21:04:18,468 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 2.0) internal successors, (6), 3 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 6 [2023-11-06 21:04:18,468 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-06 21:04:18,472 INFO L225 Difference]: With dead ends: 94 [2023-11-06 21:04:18,472 INFO L226 Difference]: Without dead ends: 94 [2023-11-06 21:04:18,478 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2023-11-06 21:04:18,480 INFO L413 NwaCegarLoop]: 21 mSDtfsCounter, 134 mSDsluCounter, 11 mSDsCounter, 0 mSdLazyCounter, 82 mSolverCounterSat, 33 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 134 SdHoareTripleChecker+Valid, 32 SdHoareTripleChecker+Invalid, 115 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 33 IncrementalHoareTripleChecker+Valid, 82 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-06 21:04:18,480 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [134 Valid, 32 Invalid, 115 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [33 Valid, 82 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-11-06 21:04:18,482 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94 states. [2023-11-06 21:04:18,488 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94 to 75. [2023-11-06 21:04:18,488 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 75 states, 48 states have (on average 1.8125) internal successors, (87), 74 states have internal predecessors, (87), 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) [2023-11-06 21:04:18,490 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 87 transitions. [2023-11-06 21:04:18,490 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 87 transitions. Word has length 6 [2023-11-06 21:04:18,491 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-06 21:04:18,491 INFO L495 AbstractCegarLoop]: Abstraction has 75 states and 87 transitions. [2023-11-06 21:04:18,491 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 2.0) internal successors, (6), 3 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 21:04:18,491 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 87 transitions. [2023-11-06 21:04:18,491 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2023-11-06 21:04:18,492 INFO L187 NwaCegarLoop]: Found error trace [2023-11-06 21:04:18,492 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2023-11-06 21:04:18,492 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2023-11-06 21:04:18,492 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 35 more)] === [2023-11-06 21:04:18,493 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-11-06 21:04:18,493 INFO L85 PathProgramCache]: Analyzing trace with hash -1992577302, now seen corresponding path program 1 times [2023-11-06 21:04:18,493 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-06 21:04:18,493 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [921078303] [2023-11-06 21:04:18,493 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 21:04:18,493 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-06 21:04:18,512 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 21:04:18,688 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-06 21:04:18,689 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-06 21:04:18,689 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [921078303] [2023-11-06 21:04:18,689 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [921078303] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-06 21:04:18,689 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-06 21:04:18,690 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-11-06 21:04:18,690 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [901343405] [2023-11-06 21:04:18,690 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-06 21:04:18,690 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-11-06 21:04:18,691 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-06 21:04:18,691 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-11-06 21:04:18,692 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-11-06 21:04:18,693 INFO L87 Difference]: Start difference. First operand 75 states and 87 transitions. Second operand has 4 states, 3 states have (on average 2.0) internal successors, (6), 3 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 21:04:18,944 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-06 21:04:18,944 INFO L93 Difference]: Finished difference Result 147 states and 161 transitions. [2023-11-06 21:04:18,945 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-11-06 21:04:18,945 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 2.0) internal successors, (6), 3 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 6 [2023-11-06 21:04:18,945 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-06 21:04:18,947 INFO L225 Difference]: With dead ends: 147 [2023-11-06 21:04:18,947 INFO L226 Difference]: Without dead ends: 147 [2023-11-06 21:04:18,947 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2023-11-06 21:04:18,949 INFO L413 NwaCegarLoop]: 30 mSDtfsCounter, 111 mSDsluCounter, 48 mSDsCounter, 0 mSdLazyCounter, 125 mSolverCounterSat, 19 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 111 SdHoareTripleChecker+Valid, 78 SdHoareTripleChecker+Invalid, 144 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 19 IncrementalHoareTripleChecker+Valid, 125 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-06 21:04:18,949 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [111 Valid, 78 Invalid, 144 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [19 Valid, 125 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-11-06 21:04:18,951 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 147 states. [2023-11-06 21:04:18,958 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 147 to 102. [2023-11-06 21:04:18,959 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 102 states, 75 states have (on average 1.6666666666666667) internal successors, (125), 101 states have internal predecessors, (125), 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) [2023-11-06 21:04:18,985 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 102 states to 102 states and 125 transitions. [2023-11-06 21:04:19,000 INFO L78 Accepts]: Start accepts. Automaton has 102 states and 125 transitions. Word has length 6 [2023-11-06 21:04:19,000 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-06 21:04:19,001 INFO L495 AbstractCegarLoop]: Abstraction has 102 states and 125 transitions. [2023-11-06 21:04:19,001 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 2.0) internal successors, (6), 3 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 21:04:19,001 INFO L276 IsEmpty]: Start isEmpty. Operand 102 states and 125 transitions. [2023-11-06 21:04:19,002 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2023-11-06 21:04:19,002 INFO L187 NwaCegarLoop]: Found error trace [2023-11-06 21:04:19,003 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-06 21:04:19,003 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2023-11-06 21:04:19,003 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 35 more)] === [2023-11-06 21:04:19,004 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-11-06 21:04:19,004 INFO L85 PathProgramCache]: Analyzing trace with hash -718284423, now seen corresponding path program 1 times [2023-11-06 21:04:19,004 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-06 21:04:19,005 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [795542790] [2023-11-06 21:04:19,005 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 21:04:19,007 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-06 21:04:19,071 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 21:04:19,374 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-06 21:04:19,375 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-06 21:04:19,375 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [795542790] [2023-11-06 21:04:19,375 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [795542790] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-06 21:04:19,376 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-06 21:04:19,376 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-11-06 21:04:19,376 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [939561038] [2023-11-06 21:04:19,376 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-06 21:04:19,377 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-11-06 21:04:19,377 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-06 21:04:19,377 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-11-06 21:04:19,378 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2023-11-06 21:04:19,378 INFO L87 Difference]: Start difference. First operand 102 states and 125 transitions. Second operand has 5 states, 4 states have (on average 3.0) internal successors, (12), 5 states have internal predecessors, (12), 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) [2023-11-06 21:04:19,619 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-06 21:04:19,619 INFO L93 Difference]: Finished difference Result 120 states and 133 transitions. [2023-11-06 21:04:19,620 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-11-06 21:04:19,620 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 3.0) internal successors, (12), 5 states have internal predecessors, (12), 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 12 [2023-11-06 21:04:19,620 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-06 21:04:19,621 INFO L225 Difference]: With dead ends: 120 [2023-11-06 21:04:19,621 INFO L226 Difference]: Without dead ends: 120 [2023-11-06 21:04:19,622 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2023-11-06 21:04:19,623 INFO L413 NwaCegarLoop]: 48 mSDtfsCounter, 97 mSDsluCounter, 54 mSDsCounter, 0 mSdLazyCounter, 197 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 97 SdHoareTripleChecker+Valid, 102 SdHoareTripleChecker+Invalid, 208 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 197 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-06 21:04:19,624 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [97 Valid, 102 Invalid, 208 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 197 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-11-06 21:04:19,625 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 120 states. [2023-11-06 21:04:19,630 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 120 to 99. [2023-11-06 21:04:19,631 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 99 states, 75 states have (on average 1.6266666666666667) internal successors, (122), 98 states have internal predecessors, (122), 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) [2023-11-06 21:04:19,632 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 99 states to 99 states and 122 transitions. [2023-11-06 21:04:19,632 INFO L78 Accepts]: Start accepts. Automaton has 99 states and 122 transitions. Word has length 12 [2023-11-06 21:04:19,633 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-06 21:04:19,633 INFO L495 AbstractCegarLoop]: Abstraction has 99 states and 122 transitions. [2023-11-06 21:04:19,633 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 3.0) internal successors, (12), 5 states have internal predecessors, (12), 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) [2023-11-06 21:04:19,633 INFO L276 IsEmpty]: Start isEmpty. Operand 99 states and 122 transitions. [2023-11-06 21:04:19,634 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2023-11-06 21:04:19,634 INFO L187 NwaCegarLoop]: Found error trace [2023-11-06 21:04:19,634 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-06 21:04:19,635 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2023-11-06 21:04:19,635 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 35 more)] === [2023-11-06 21:04:19,635 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-11-06 21:04:19,636 INFO L85 PathProgramCache]: Analyzing trace with hash -718284422, now seen corresponding path program 1 times [2023-11-06 21:04:19,636 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-06 21:04:19,636 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [674806136] [2023-11-06 21:04:19,636 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 21:04:19,637 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-06 21:04:19,655 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 21:04:19,885 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-06 21:04:19,885 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-06 21:04:19,885 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [674806136] [2023-11-06 21:04:19,886 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [674806136] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-06 21:04:19,886 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-06 21:04:19,886 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-11-06 21:04:19,887 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [291669446] [2023-11-06 21:04:19,887 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-06 21:04:19,888 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-11-06 21:04:19,889 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-06 21:04:19,889 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-11-06 21:04:19,889 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2023-11-06 21:04:19,890 INFO L87 Difference]: Start difference. First operand 99 states and 122 transitions. Second operand has 5 states, 4 states have (on average 3.0) internal successors, (12), 5 states have internal predecessors, (12), 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) [2023-11-06 21:04:20,189 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-06 21:04:20,189 INFO L93 Difference]: Finished difference Result 112 states and 126 transitions. [2023-11-06 21:04:20,190 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-11-06 21:04:20,190 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 3.0) internal successors, (12), 5 states have internal predecessors, (12), 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 12 [2023-11-06 21:04:20,190 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-06 21:04:20,191 INFO L225 Difference]: With dead ends: 112 [2023-11-06 21:04:20,191 INFO L226 Difference]: Without dead ends: 112 [2023-11-06 21:04:20,192 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2023-11-06 21:04:20,192 INFO L413 NwaCegarLoop]: 64 mSDtfsCounter, 54 mSDsluCounter, 82 mSDsCounter, 0 mSdLazyCounter, 205 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 54 SdHoareTripleChecker+Valid, 146 SdHoareTripleChecker+Invalid, 217 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 205 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-06 21:04:20,193 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [54 Valid, 146 Invalid, 217 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 205 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-11-06 21:04:20,194 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 112 states. [2023-11-06 21:04:20,203 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 112 to 83. [2023-11-06 21:04:20,206 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 83 states, 67 states have (on average 1.5820895522388059) internal successors, (106), 82 states have internal predecessors, (106), 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) [2023-11-06 21:04:20,209 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 106 transitions. [2023-11-06 21:04:20,212 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 106 transitions. Word has length 12 [2023-11-06 21:04:20,213 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-06 21:04:20,213 INFO L495 AbstractCegarLoop]: Abstraction has 83 states and 106 transitions. [2023-11-06 21:04:20,213 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 3.0) internal successors, (12), 5 states have internal predecessors, (12), 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) [2023-11-06 21:04:20,213 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 106 transitions. [2023-11-06 21:04:20,214 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2023-11-06 21:04:20,214 INFO L187 NwaCegarLoop]: Found error trace [2023-11-06 21:04:20,214 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-06 21:04:20,215 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2023-11-06 21:04:20,215 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr16REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 35 more)] === [2023-11-06 21:04:20,216 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-11-06 21:04:20,216 INFO L85 PathProgramCache]: Analyzing trace with hash -1704337968, now seen corresponding path program 1 times [2023-11-06 21:04:20,216 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-06 21:04:20,217 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1941557886] [2023-11-06 21:04:20,217 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 21:04:20,218 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-06 21:04:20,251 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 21:04:20,493 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-06 21:04:20,493 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-06 21:04:20,494 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1941557886] [2023-11-06 21:04:20,494 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1941557886] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-06 21:04:20,494 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-06 21:04:20,494 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2023-11-06 21:04:20,494 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [695337337] [2023-11-06 21:04:20,495 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-06 21:04:20,495 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-11-06 21:04:20,495 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-06 21:04:20,496 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-11-06 21:04:20,496 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2023-11-06 21:04:20,496 INFO L87 Difference]: Start difference. First operand 83 states and 106 transitions. Second operand has 7 states, 7 states have (on average 1.8571428571428572) internal successors, (13), 6 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) [2023-11-06 21:04:20,786 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-06 21:04:20,786 INFO L93 Difference]: Finished difference Result 136 states and 155 transitions. [2023-11-06 21:04:20,787 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2023-11-06 21:04:20,787 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 1.8571428571428572) internal successors, (13), 6 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 13 [2023-11-06 21:04:20,787 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-06 21:04:20,788 INFO L225 Difference]: With dead ends: 136 [2023-11-06 21:04:20,788 INFO L226 Difference]: Without dead ends: 136 [2023-11-06 21:04:20,789 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=29, Invalid=43, Unknown=0, NotChecked=0, Total=72 [2023-11-06 21:04:20,790 INFO L413 NwaCegarLoop]: 23 mSDtfsCounter, 199 mSDsluCounter, 70 mSDsCounter, 0 mSdLazyCounter, 207 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 199 SdHoareTripleChecker+Valid, 93 SdHoareTripleChecker+Invalid, 217 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 207 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-06 21:04:20,790 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [199 Valid, 93 Invalid, 217 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 207 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-11-06 21:04:20,791 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 136 states. [2023-11-06 21:04:20,795 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 136 to 78. [2023-11-06 21:04:20,795 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 78 states, 62 states have (on average 1.532258064516129) internal successors, (95), 77 states have internal predecessors, (95), 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) [2023-11-06 21:04:20,796 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 78 states to 78 states and 95 transitions. [2023-11-06 21:04:20,796 INFO L78 Accepts]: Start accepts. Automaton has 78 states and 95 transitions. Word has length 13 [2023-11-06 21:04:20,797 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-06 21:04:20,797 INFO L495 AbstractCegarLoop]: Abstraction has 78 states and 95 transitions. [2023-11-06 21:04:20,797 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 1.8571428571428572) internal successors, (13), 6 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) [2023-11-06 21:04:20,797 INFO L276 IsEmpty]: Start isEmpty. Operand 78 states and 95 transitions. [2023-11-06 21:04:20,798 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2023-11-06 21:04:20,798 INFO L187 NwaCegarLoop]: Found error trace [2023-11-06 21:04:20,798 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-06 21:04:20,798 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2023-11-06 21:04:20,799 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr20REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 35 more)] === [2023-11-06 21:04:20,799 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-11-06 21:04:20,799 INFO L85 PathProgramCache]: Analyzing trace with hash -1490657010, now seen corresponding path program 1 times [2023-11-06 21:04:20,799 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-06 21:04:20,800 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1473953465] [2023-11-06 21:04:20,800 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 21:04:20,800 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-06 21:04:20,819 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 21:04:21,117 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-06 21:04:21,118 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-06 21:04:21,118 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1473953465] [2023-11-06 21:04:21,118 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1473953465] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-06 21:04:21,118 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-06 21:04:21,118 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2023-11-06 21:04:21,119 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1526086591] [2023-11-06 21:04:21,119 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-06 21:04:21,119 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2023-11-06 21:04:21,119 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-06 21:04:21,120 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2023-11-06 21:04:21,120 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=37, Unknown=0, NotChecked=0, Total=56 [2023-11-06 21:04:21,121 INFO L87 Difference]: Start difference. First operand 78 states and 95 transitions. Second operand has 8 states, 8 states have (on average 1.875) internal successors, (15), 7 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) [2023-11-06 21:04:21,476 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-06 21:04:21,476 INFO L93 Difference]: Finished difference Result 126 states and 137 transitions. [2023-11-06 21:04:21,477 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2023-11-06 21:04:21,477 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 1.875) internal successors, (15), 7 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 [2023-11-06 21:04:21,477 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-06 21:04:21,478 INFO L225 Difference]: With dead ends: 126 [2023-11-06 21:04:21,478 INFO L226 Difference]: Without dead ends: 126 [2023-11-06 21:04:21,478 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=34, Invalid=56, Unknown=0, NotChecked=0, Total=90 [2023-11-06 21:04:21,480 INFO L413 NwaCegarLoop]: 20 mSDtfsCounter, 159 mSDsluCounter, 86 mSDsCounter, 0 mSdLazyCounter, 277 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 159 SdHoareTripleChecker+Valid, 106 SdHoareTripleChecker+Invalid, 288 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 277 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-11-06 21:04:21,480 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [159 Valid, 106 Invalid, 288 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 277 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-11-06 21:04:21,481 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 126 states. [2023-11-06 21:04:21,484 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 126 to 73. [2023-11-06 21:04:21,485 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 73 states, 57 states have (on average 1.4736842105263157) internal successors, (84), 72 states have internal predecessors, (84), 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) [2023-11-06 21:04:21,485 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 84 transitions. [2023-11-06 21:04:21,486 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 84 transitions. Word has length 15 [2023-11-06 21:04:21,486 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-06 21:04:21,486 INFO L495 AbstractCegarLoop]: Abstraction has 73 states and 84 transitions. [2023-11-06 21:04:21,486 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 1.875) internal successors, (15), 7 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) [2023-11-06 21:04:21,486 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 84 transitions. [2023-11-06 21:04:21,487 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2023-11-06 21:04:21,487 INFO L187 NwaCegarLoop]: Found error trace [2023-11-06 21:04:21,487 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-06 21:04:21,488 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2023-11-06 21:04:21,488 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr17REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 35 more)] === [2023-11-06 21:04:21,488 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-11-06 21:04:21,489 INFO L85 PathProgramCache]: Analyzing trace with hash 263908707, now seen corresponding path program 1 times [2023-11-06 21:04:21,489 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-06 21:04:21,489 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [5710627] [2023-11-06 21:04:21,489 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 21:04:21,489 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-06 21:04:21,512 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 21:04:21,698 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-06 21:04:21,698 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-06 21:04:21,698 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [5710627] [2023-11-06 21:04:21,699 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [5710627] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-06 21:04:21,699 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [886195931] [2023-11-06 21:04:21,699 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 21:04:21,699 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-06 21:04:21,699 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e6d197e6-15be-4c65-afca-81dca8796916/bin/utaipan-verify-FOvIYxoinp/z3 [2023-11-06 21:04:21,708 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e6d197e6-15be-4c65-afca-81dca8796916/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-06 21:04:21,776 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e6d197e6-15be-4c65-afca-81dca8796916/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-11-06 21:04:21,875 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 21:04:21,878 INFO L262 TraceCheckSpWp]: Trace formula consists of 144 conjuncts, 11 conjunts are in the unsatisfiable core [2023-11-06 21:04:21,889 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-06 21:04:22,089 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-06 21:04:22,089 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-06 21:04:22,236 INFO L322 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-11-06 21:04:22,237 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 19 treesize of output 23 [2023-11-06 21:04:22,383 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-06 21:04:22,383 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [886195931] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-06 21:04:22,383 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [417910466] [2023-11-06 21:04:22,411 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2023-11-06 21:04:22,411 INFO L166 IcfgInterpreter]: Building call graph [2023-11-06 21:04:22,416 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-06 21:04:22,422 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-06 21:04:22,423 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-06 21:04:24,529 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-06 21:04:25,538 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1654#(and (<= 1 |#StackHeapBarrier|) (= |ULTIMATE.start_main_~a~0#1.offset| 0) (= |ULTIMATE.start_main_~i~0#1| 0) (<= (select |#length| |ULTIMATE.start_main_~p~0#1.base|) 3) (exists ((|v_#memory_$Pointer$.base_53| (Array Int (Array Int Int))) (|v_ULTIMATE.start_main_~y~0#1_28| Int) (|v_#memory_$Pointer$.offset_53| (Array Int (Array Int Int))) (|v_#memory_$Pointer$.base_54| (Array Int (Array Int Int))) (|v_#memory_int_43| (Array Int (Array Int Int))) (|v_#memory_$Pointer$.offset_54| (Array Int (Array Int Int))) (|v_ULTIMATE.start_main_~p~0#1.base_101| Int) (|v_ULTIMATE.start_main_~p~0#1.offset_84| Int)) (and (= (store |v_#memory_$Pointer$.base_53| |v_ULTIMATE.start_main_~p~0#1.base_101| (store (select |v_#memory_$Pointer$.base_53| |v_ULTIMATE.start_main_~p~0#1.base_101|) |v_ULTIMATE.start_main_~p~0#1.offset_84| (select (select |v_#memory_$Pointer$.base_54| |v_ULTIMATE.start_main_~p~0#1.base_101|) |v_ULTIMATE.start_main_~p~0#1.offset_84|))) |v_#memory_$Pointer$.base_54|) (or (and (= |v_ULTIMATE.start_main_~p~0#1.offset_84| 0) (= |v_ULTIMATE.start_main_~y~0#1_28| 0)) (= |ULTIMATE.start_main_~t~0#1.offset| 0)) (<= (+ |v_ULTIMATE.start_main_~p~0#1.offset_84| 8) (select |#length| |v_ULTIMATE.start_main_~p~0#1.base_101|)) (= (select |#valid| |v_ULTIMATE.start_main_~p~0#1.base_101|) 1) (= |#memory_$Pointer$.base| (store |v_#memory_$Pointer$.base_54| |v_ULTIMATE.start_main_~p~0#1.base_101| (store (select |v_#memory_$Pointer$.base_54| |v_ULTIMATE.start_main_~p~0#1.base_101|) (+ |v_ULTIMATE.start_main_~p~0#1.offset_84| 4) 0))) (= (store |v_#memory_$Pointer$.offset_53| |v_ULTIMATE.start_main_~p~0#1.base_101| (store (select |v_#memory_$Pointer$.offset_53| |v_ULTIMATE.start_main_~p~0#1.base_101|) |v_ULTIMATE.start_main_~p~0#1.offset_84| (select (select |v_#memory_$Pointer$.offset_54| |v_ULTIMATE.start_main_~p~0#1.base_101|) |v_ULTIMATE.start_main_~p~0#1.offset_84|))) |v_#memory_$Pointer$.offset_54|) (<= 0 |v_ULTIMATE.start_main_~p~0#1.offset_84|) (= |#memory_$Pointer$.offset| (store |v_#memory_$Pointer$.offset_54| |v_ULTIMATE.start_main_~p~0#1.base_101| (store (select |v_#memory_$Pointer$.offset_54| |v_ULTIMATE.start_main_~p~0#1.base_101|) (+ |v_ULTIMATE.start_main_~p~0#1.offset_84| 4) 0))) (= |#memory_int| (store |v_#memory_int_43| |v_ULTIMATE.start_main_~p~0#1.base_101| (store (store (select |v_#memory_int_43| |v_ULTIMATE.start_main_~p~0#1.base_101|) |v_ULTIMATE.start_main_~p~0#1.offset_84| 3) (+ |v_ULTIMATE.start_main_~p~0#1.offset_84| 4) (select (select |#memory_int| |v_ULTIMATE.start_main_~p~0#1.base_101|) (+ |v_ULTIMATE.start_main_~p~0#1.offset_84| 4))))) (<= 0 |v_ULTIMATE.start_main_~y~0#1_28|))) (= |ULTIMATE.start_main_~y~0#1| 0) (= |ULTIMATE.start_main_~a~0#1.base| |ULTIMATE.start_main_~p~0#1.base|) (= |ULTIMATE.start_main_~p~0#1.offset| 0))' at error location [2023-11-06 21:04:25,538 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-06 21:04:25,538 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-06 21:04:25,539 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5, 5] total 14 [2023-11-06 21:04:25,539 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1985406185] [2023-11-06 21:04:25,539 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-06 21:04:25,539 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2023-11-06 21:04:25,540 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-06 21:04:25,540 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2023-11-06 21:04:25,541 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=166, Invalid=589, Unknown=1, NotChecked=0, Total=756 [2023-11-06 21:04:25,541 INFO L87 Difference]: Start difference. First operand 73 states and 84 transitions. Second operand has 16 states, 15 states have (on average 2.7333333333333334) internal successors, (41), 15 states have internal predecessors, (41), 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) [2023-11-06 21:04:25,876 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-06 21:04:25,876 INFO L93 Difference]: Finished difference Result 103 states and 113 transitions. [2023-11-06 21:04:25,876 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-11-06 21:04:25,877 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 15 states have (on average 2.7333333333333334) internal successors, (41), 15 states have internal predecessors, (41), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 16 [2023-11-06 21:04:25,877 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-06 21:04:25,878 INFO L225 Difference]: With dead ends: 103 [2023-11-06 21:04:25,878 INFO L226 Difference]: Without dead ends: 103 [2023-11-06 21:04:25,879 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 26 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 268 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=208, Invalid=721, Unknown=1, NotChecked=0, Total=930 [2023-11-06 21:04:25,880 INFO L413 NwaCegarLoop]: 21 mSDtfsCounter, 319 mSDsluCounter, 108 mSDsCounter, 0 mSdLazyCounter, 256 mSolverCounterSat, 44 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 319 SdHoareTripleChecker+Valid, 129 SdHoareTripleChecker+Invalid, 300 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 44 IncrementalHoareTripleChecker+Valid, 256 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-11-06 21:04:25,880 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [319 Valid, 129 Invalid, 300 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [44 Valid, 256 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-11-06 21:04:25,881 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 103 states. [2023-11-06 21:04:25,884 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 103 to 75. [2023-11-06 21:04:25,885 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 75 states, 60 states have (on average 1.4) internal successors, (84), 74 states have internal predecessors, (84), 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) [2023-11-06 21:04:25,885 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 84 transitions. [2023-11-06 21:04:25,886 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 84 transitions. Word has length 16 [2023-11-06 21:04:25,886 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-06 21:04:25,886 INFO L495 AbstractCegarLoop]: Abstraction has 75 states and 84 transitions. [2023-11-06 21:04:25,886 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 15 states have (on average 2.7333333333333334) internal successors, (41), 15 states have internal predecessors, (41), 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) [2023-11-06 21:04:25,887 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 84 transitions. [2023-11-06 21:04:25,887 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2023-11-06 21:04:25,888 INFO L187 NwaCegarLoop]: Found error trace [2023-11-06 21:04:25,888 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-06 21:04:25,901 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e6d197e6-15be-4c65-afca-81dca8796916/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2023-11-06 21:04:26,095 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e6d197e6-15be-4c65-afca-81dca8796916/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-06 21:04:26,095 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr26ASSERT_VIOLATIONMEMORY_LEAK === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 35 more)] === [2023-11-06 21:04:26,096 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-11-06 21:04:26,096 INFO L85 PathProgramCache]: Analyzing trace with hash 1993991201, now seen corresponding path program 1 times [2023-11-06 21:04:26,096 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-06 21:04:26,097 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [546310881] [2023-11-06 21:04:26,097 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 21:04:26,098 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-06 21:04:26,129 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 21:04:26,455 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-06 21:04:26,455 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-06 21:04:26,455 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [546310881] [2023-11-06 21:04:26,456 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [546310881] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-06 21:04:26,456 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-06 21:04:26,456 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2023-11-06 21:04:26,456 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [9214441] [2023-11-06 21:04:26,456 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-06 21:04:26,457 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2023-11-06 21:04:26,457 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-06 21:04:26,457 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2023-11-06 21:04:26,458 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=40, Unknown=0, NotChecked=0, Total=56 [2023-11-06 21:04:26,458 INFO L87 Difference]: Start difference. First operand 75 states and 84 transitions. Second operand has 8 states, 8 states have (on average 2.125) internal successors, (17), 7 states have internal predecessors, (17), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 21:04:26,820 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-06 21:04:26,821 INFO L93 Difference]: Finished difference Result 113 states and 121 transitions. [2023-11-06 21:04:26,821 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2023-11-06 21:04:26,821 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 2.125) internal successors, (17), 7 states have internal predecessors, (17), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 17 [2023-11-06 21:04:26,822 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-06 21:04:26,822 INFO L225 Difference]: With dead ends: 113 [2023-11-06 21:04:26,822 INFO L226 Difference]: Without dead ends: 113 [2023-11-06 21:04:26,823 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=47, Invalid=85, Unknown=0, NotChecked=0, Total=132 [2023-11-06 21:04:26,823 INFO L413 NwaCegarLoop]: 26 mSDtfsCounter, 162 mSDsluCounter, 80 mSDsCounter, 0 mSdLazyCounter, 234 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 162 SdHoareTripleChecker+Valid, 106 SdHoareTripleChecker+Invalid, 245 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 234 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-11-06 21:04:26,824 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [162 Valid, 106 Invalid, 245 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 234 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-11-06 21:04:26,824 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 113 states. [2023-11-06 21:04:26,827 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 113 to 77. [2023-11-06 21:04:26,827 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 77 states, 62 states have (on average 1.3870967741935485) internal successors, (86), 76 states have internal predecessors, (86), 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) [2023-11-06 21:04:26,828 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 86 transitions. [2023-11-06 21:04:26,836 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 86 transitions. Word has length 17 [2023-11-06 21:04:26,836 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-06 21:04:26,836 INFO L495 AbstractCegarLoop]: Abstraction has 77 states and 86 transitions. [2023-11-06 21:04:26,836 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 2.125) internal successors, (17), 7 states have internal predecessors, (17), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 21:04:26,837 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 86 transitions. [2023-11-06 21:04:26,837 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2023-11-06 21:04:26,838 INFO L187 NwaCegarLoop]: Found error trace [2023-11-06 21:04:26,838 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-06 21:04:26,838 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2023-11-06 21:04:26,839 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr16REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 35 more)] === [2023-11-06 21:04:26,839 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-11-06 21:04:26,840 INFO L85 PathProgramCache]: Analyzing trace with hash -1980779038, now seen corresponding path program 1 times [2023-11-06 21:04:26,840 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-06 21:04:26,840 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1069621284] [2023-11-06 21:04:26,840 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 21:04:26,841 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-06 21:04:26,880 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 21:04:27,466 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-06 21:04:27,467 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-06 21:04:27,467 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1069621284] [2023-11-06 21:04:27,467 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1069621284] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-06 21:04:27,467 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [578779720] [2023-11-06 21:04:27,468 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 21:04:27,468 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-06 21:04:27,468 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e6d197e6-15be-4c65-afca-81dca8796916/bin/utaipan-verify-FOvIYxoinp/z3 [2023-11-06 21:04:27,469 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e6d197e6-15be-4c65-afca-81dca8796916/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-06 21:04:27,491 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e6d197e6-15be-4c65-afca-81dca8796916/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-11-06 21:04:27,585 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 21:04:27,588 INFO L262 TraceCheckSpWp]: Trace formula consists of 162 conjuncts, 33 conjunts are in the unsatisfiable core [2023-11-06 21:04:27,591 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-06 21:04:27,676 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2023-11-06 21:04:27,693 INFO L322 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2023-11-06 21:04:27,693 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 11 treesize of output 11 [2023-11-06 21:04:27,810 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 1 [2023-11-06 21:04:27,818 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 11 [2023-11-06 21:04:27,859 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 8 [2023-11-06 21:04:27,908 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 11 [2023-11-06 21:04:27,926 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 11 [2023-11-06 21:04:27,967 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 1 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-06 21:04:27,967 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-06 21:04:28,192 INFO L322 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-11-06 21:04:28,192 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 2 case distinctions, treesize of input 24 treesize of output 30 [2023-11-06 21:04:28,207 INFO L322 Elim1Store]: treesize reduction 4, result has 63.6 percent of original size [2023-11-06 21:04:28,207 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 33 treesize of output 32 [2023-11-06 21:04:28,217 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 18 [2023-11-06 21:04:28,233 INFO L322 Elim1Store]: treesize reduction 5, result has 37.5 percent of original size [2023-11-06 21:04:28,234 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 13 treesize of output 12 [2023-11-06 21:04:28,306 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 1 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-06 21:04:28,306 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [578779720] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-06 21:04:28,306 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [461390832] [2023-11-06 21:04:28,309 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2023-11-06 21:04:28,309 INFO L166 IcfgInterpreter]: Building call graph [2023-11-06 21:04:28,309 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-06 21:04:28,310 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-06 21:04:28,310 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-06 21:04:30,145 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-06 21:04:32,104 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2187#(and (or (and (= |ULTIMATE.start_main_~i~0#1| 0) (= |ULTIMATE.start_main_~a~0#1.offset| |ULTIMATE.start_main_~p~0#1.offset|) (exists ((|v_#memory_int_63| (Array Int (Array Int Int))) (|v_#memory_$Pointer$.base_71| (Array Int (Array Int Int))) (|v_#memory_$Pointer$.base_70| (Array Int (Array Int Int))) (|v_#memory_$Pointer$.offset_69| (Array Int (Array Int Int))) (|v_ULTIMATE.start_main_~p~0#1.offset_94| Int) (|v_ULTIMATE.start_main_~p~0#1.base_113| Int) (|v_#memory_$Pointer$.offset_70| (Array Int (Array Int Int)))) (and (= |#memory_int| (store |v_#memory_int_63| |v_ULTIMATE.start_main_~p~0#1.base_113| (store (store (select |v_#memory_int_63| |v_ULTIMATE.start_main_~p~0#1.base_113|) |v_ULTIMATE.start_main_~p~0#1.offset_94| 3) (+ |v_ULTIMATE.start_main_~p~0#1.offset_94| 4) (select (select |#memory_int| |v_ULTIMATE.start_main_~p~0#1.base_113|) (+ |v_ULTIMATE.start_main_~p~0#1.offset_94| 4))))) (= (select |#valid| |v_ULTIMATE.start_main_~p~0#1.base_113|) 1) (<= (+ |v_ULTIMATE.start_main_~p~0#1.offset_94| 8) (select |#length| |v_ULTIMATE.start_main_~p~0#1.base_113|)) (= |#memory_$Pointer$.offset| (store |v_#memory_$Pointer$.offset_70| |v_ULTIMATE.start_main_~p~0#1.base_113| (store (select |v_#memory_$Pointer$.offset_70| |v_ULTIMATE.start_main_~p~0#1.base_113|) (+ |v_ULTIMATE.start_main_~p~0#1.offset_94| 4) 0))) (= (store |v_#memory_$Pointer$.offset_69| |v_ULTIMATE.start_main_~p~0#1.base_113| (store (select |v_#memory_$Pointer$.offset_69| |v_ULTIMATE.start_main_~p~0#1.base_113|) |v_ULTIMATE.start_main_~p~0#1.offset_94| (select (select |v_#memory_$Pointer$.offset_70| |v_ULTIMATE.start_main_~p~0#1.base_113|) |v_ULTIMATE.start_main_~p~0#1.offset_94|))) |v_#memory_$Pointer$.offset_70|) (= (store |v_#memory_$Pointer$.base_70| |v_ULTIMATE.start_main_~p~0#1.base_113| (store (select |v_#memory_$Pointer$.base_70| |v_ULTIMATE.start_main_~p~0#1.base_113|) |v_ULTIMATE.start_main_~p~0#1.offset_94| (select (select |v_#memory_$Pointer$.base_71| |v_ULTIMATE.start_main_~p~0#1.base_113|) |v_ULTIMATE.start_main_~p~0#1.offset_94|))) |v_#memory_$Pointer$.base_71|) (= |#memory_$Pointer$.base| (store |v_#memory_$Pointer$.base_71| |v_ULTIMATE.start_main_~p~0#1.base_113| (store (select |v_#memory_$Pointer$.base_71| |v_ULTIMATE.start_main_~p~0#1.base_113|) (+ |v_ULTIMATE.start_main_~p~0#1.offset_94| 4) 0))) (<= 0 |v_ULTIMATE.start_main_~p~0#1.offset_94|))) (= |ULTIMATE.start_main_~a~0#1.base| |ULTIMATE.start_main_~p~0#1.base|)) (exists ((|v_ULTIMATE.start_main_~p~0#1.base_117| Int) (|v_ULTIMATE.start_main_~p~0#1.offset_98| Int)) (and (<= 0 |ULTIMATE.start_main_~a~0#1.offset|) (<= 1 |ULTIMATE.start_main_~i~0#1|) (= (select (select |#memory_$Pointer$.base| |v_ULTIMATE.start_main_~p~0#1.base_117|) (+ |v_ULTIMATE.start_main_~p~0#1.offset_98| 4)) |ULTIMATE.start_main_~p~0#1.base|) (<= 0 |v_ULTIMATE.start_main_~p~0#1.offset_98|) (<= (+ |v_ULTIMATE.start_main_~p~0#1.offset_98| 8) (select |#length| |v_ULTIMATE.start_main_~p~0#1.base_117|)) (= (select (select |#memory_$Pointer$.offset| |v_ULTIMATE.start_main_~p~0#1.base_117|) (+ |v_ULTIMATE.start_main_~p~0#1.offset_98| 4)) |ULTIMATE.start_main_~p~0#1.offset|) (= (select |#valid| |v_ULTIMATE.start_main_~p~0#1.base_117|) 1)))) (= |ULTIMATE.start_main_~y~0#1| 0) (not (= (select |#valid| |ULTIMATE.start_main_~p~0#1.base|) 1)))' at error location [2023-11-06 21:04:32,104 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-06 21:04:32,104 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-06 21:04:32,105 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8] total 23 [2023-11-06 21:04:32,105 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [947043100] [2023-11-06 21:04:32,105 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-06 21:04:32,105 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2023-11-06 21:04:32,106 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-06 21:04:32,106 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2023-11-06 21:04:32,107 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=132, Invalid=1115, Unknown=13, NotChecked=0, Total=1260 [2023-11-06 21:04:32,107 INFO L87 Difference]: Start difference. First operand 77 states and 86 transitions. Second operand has 23 states, 23 states have (on average 2.391304347826087) internal successors, (55), 23 states have internal predecessors, (55), 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) [2023-11-06 21:04:34,179 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-06 21:04:34,179 INFO L93 Difference]: Finished difference Result 187 states and 202 transitions. [2023-11-06 21:04:34,179 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2023-11-06 21:04:34,180 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 2.391304347826087) internal successors, (55), 23 states have internal predecessors, (55), 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 [2023-11-06 21:04:34,180 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-06 21:04:34,182 INFO L225 Difference]: With dead ends: 187 [2023-11-06 21:04:34,183 INFO L226 Difference]: Without dead ends: 187 [2023-11-06 21:04:34,185 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 85 GetRequests, 30 SyntacticMatches, 0 SemanticMatches, 55 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 786 ImplicationChecksByTransitivity, 3.4s TimeCoverageRelationStatistics Valid=436, Invalid=2743, Unknown=13, NotChecked=0, Total=3192 [2023-11-06 21:04:34,186 INFO L413 NwaCegarLoop]: 30 mSDtfsCounter, 422 mSDsluCounter, 324 mSDsCounter, 0 mSdLazyCounter, 913 mSolverCounterSat, 67 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 422 SdHoareTripleChecker+Valid, 354 SdHoareTripleChecker+Invalid, 980 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 67 IncrementalHoareTripleChecker+Valid, 913 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2023-11-06 21:04:34,187 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [422 Valid, 354 Invalid, 980 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [67 Valid, 913 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time] [2023-11-06 21:04:34,189 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 187 states. [2023-11-06 21:04:34,196 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 187 to 105. [2023-11-06 21:04:34,197 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 105 states, 90 states have (on average 1.3444444444444446) internal successors, (121), 104 states have internal predecessors, (121), 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) [2023-11-06 21:04:34,197 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 105 states to 105 states and 121 transitions. [2023-11-06 21:04:34,198 INFO L78 Accepts]: Start accepts. Automaton has 105 states and 121 transitions. Word has length 19 [2023-11-06 21:04:34,200 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-06 21:04:34,201 INFO L495 AbstractCegarLoop]: Abstraction has 105 states and 121 transitions. [2023-11-06 21:04:34,201 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 23 states have (on average 2.391304347826087) internal successors, (55), 23 states have internal predecessors, (55), 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) [2023-11-06 21:04:34,201 INFO L276 IsEmpty]: Start isEmpty. Operand 105 states and 121 transitions. [2023-11-06 21:04:34,206 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2023-11-06 21:04:34,206 INFO L187 NwaCegarLoop]: Found error trace [2023-11-06 21:04:34,206 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-06 21:04:34,219 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e6d197e6-15be-4c65-afca-81dca8796916/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2023-11-06 21:04:34,412 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e6d197e6-15be-4c65-afca-81dca8796916/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2023-11-06 21:04:34,413 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr17REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 35 more)] === [2023-11-06 21:04:34,413 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-11-06 21:04:34,413 INFO L85 PathProgramCache]: Analyzing trace with hash 335262017, now seen corresponding path program 1 times [2023-11-06 21:04:34,414 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-06 21:04:34,414 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [793806996] [2023-11-06 21:04:34,414 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 21:04:34,414 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-06 21:04:34,479 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 21:04:35,201 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-06 21:04:35,201 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-06 21:04:35,201 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [793806996] [2023-11-06 21:04:35,201 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [793806996] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-06 21:04:35,202 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1191525522] [2023-11-06 21:04:35,202 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 21:04:35,202 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-06 21:04:35,202 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e6d197e6-15be-4c65-afca-81dca8796916/bin/utaipan-verify-FOvIYxoinp/z3 [2023-11-06 21:04:35,203 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e6d197e6-15be-4c65-afca-81dca8796916/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-06 21:04:35,231 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e6d197e6-15be-4c65-afca-81dca8796916/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-11-06 21:04:35,318 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 21:04:35,320 INFO L262 TraceCheckSpWp]: Trace formula consists of 162 conjuncts, 32 conjunts are in the unsatisfiable core [2023-11-06 21:04:35,328 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-06 21:04:35,386 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 1 [2023-11-06 21:04:35,399 INFO L322 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2023-11-06 21:04:35,399 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 11 treesize of output 11 [2023-11-06 21:04:35,493 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 1 [2023-11-06 21:04:35,497 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2023-11-06 21:04:35,728 INFO L322 Elim1Store]: treesize reduction 17, result has 22.7 percent of original size [2023-11-06 21:04:35,728 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 39 treesize of output 30 [2023-11-06 21:04:35,735 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-06 21:04:35,736 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 13 [2023-11-06 21:04:35,781 INFO L322 Elim1Store]: treesize reduction 21, result has 19.2 percent of original size [2023-11-06 21:04:35,782 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 62 treesize of output 57 [2023-11-06 21:04:35,788 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 30 treesize of output 13 [2023-11-06 21:04:35,912 INFO L173 IndexEqualityManager]: detected equality via solver [2023-11-06 21:04:35,913 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 13 [2023-11-06 21:04:35,920 INFO L173 IndexEqualityManager]: detected equality via solver [2023-11-06 21:04:35,920 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 7 [2023-11-06 21:04:35,945 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-06 21:04:35,945 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-06 21:04:36,028 WARN L839 $PredicateComparison]: unable to prove that (let ((.cse0 (+ |c_ULTIMATE.start_main_~a~0#1.offset| 4))) (and (forall ((v_ArrVal_263 (Array Int Int))) (<= 0 (select (select (store |c_#memory_$Pointer$.offset| |c_ULTIMATE.start_main_~p~0#1.base| v_ArrVal_263) |c_ULTIMATE.start_main_~a~0#1.base|) .cse0))) (forall ((v_ArrVal_263 (Array Int Int)) (v_ArrVal_262 (Array Int Int))) (<= (+ (select (select (store |c_#memory_$Pointer$.offset| |c_ULTIMATE.start_main_~p~0#1.base| v_ArrVal_263) |c_ULTIMATE.start_main_~a~0#1.base|) .cse0) 4) (select |c_#length| (select (select (store |c_#memory_$Pointer$.base| |c_ULTIMATE.start_main_~p~0#1.base| v_ArrVal_262) |c_ULTIMATE.start_main_~a~0#1.base|) .cse0)))))) is different from false [2023-11-06 21:04:36,075 WARN L839 $PredicateComparison]: unable to prove that (let ((.cse0 (select (select |c_#memory_$Pointer$.base| |c_ULTIMATE.start_main_~p~0#1.base|) (+ |c_ULTIMATE.start_main_~p~0#1.offset| 4))) (.cse1 (+ |c_ULTIMATE.start_main_~a~0#1.offset| 4))) (and (forall ((v_ArrVal_263 (Array Int Int)) (v_ArrVal_262 (Array Int Int))) (<= (+ (select (select (store |c_#memory_$Pointer$.offset| .cse0 v_ArrVal_263) |c_ULTIMATE.start_main_~a~0#1.base|) .cse1) 4) (select |c_#length| (select (select (store |c_#memory_$Pointer$.base| .cse0 v_ArrVal_262) |c_ULTIMATE.start_main_~a~0#1.base|) .cse1)))) (forall ((v_ArrVal_263 (Array Int Int))) (<= 0 (select (select (store |c_#memory_$Pointer$.offset| .cse0 v_ArrVal_263) |c_ULTIMATE.start_main_~a~0#1.base|) .cse1))))) is different from false [2023-11-06 21:04:36,084 INFO L322 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-11-06 21:04:36,085 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 45 treesize of output 46 [2023-11-06 21:04:36,091 INFO L322 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-11-06 21:04:36,091 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 35 treesize of output 36 [2023-11-06 21:04:36,103 INFO L322 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-11-06 21:04:36,103 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 62 treesize of output 61 [2023-11-06 21:04:36,118 INFO L322 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-11-06 21:04:36,119 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 96 treesize of output 89 [2023-11-06 21:04:36,149 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2023-11-06 21:04:36,156 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2023-11-06 21:04:36,166 INFO L322 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-11-06 21:04:36,166 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 22 treesize of output 23 [2023-11-06 21:04:36,169 INFO L173 IndexEqualityManager]: detected equality via solver [2023-11-06 21:04:36,172 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-06 21:04:36,172 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 22 treesize of output 10 [2023-11-06 21:04:36,237 INFO L322 Elim1Store]: treesize reduction 5, result has 37.5 percent of original size [2023-11-06 21:04:36,238 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 13 treesize of output 12 [2023-11-06 21:04:36,299 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 2 not checked. [2023-11-06 21:04:36,299 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1191525522] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-06 21:04:36,300 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [319430656] [2023-11-06 21:04:36,302 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2023-11-06 21:04:36,302 INFO L166 IcfgInterpreter]: Building call graph [2023-11-06 21:04:36,302 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-06 21:04:36,303 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-06 21:04:36,303 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-06 21:04:38,590 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-06 21:04:40,963 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2665#(and (= |ULTIMATE.start_main_~y~0#1| 0) (or (and (exists ((|v_ULTIMATE.start_main_~p~0#1.base_129| Int) (|v_#memory_$Pointer$.base_88| (Array Int (Array Int Int))) (|v_#memory_$Pointer$.offset_86| (Array Int (Array Int Int))) (|v_#memory_$Pointer$.base_87| (Array Int (Array Int Int))) (|v_#memory_int_77| (Array Int (Array Int Int))) (|v_#memory_$Pointer$.offset_87| (Array Int (Array Int Int))) (|v_ULTIMATE.start_main_~p~0#1.offset_108| Int)) (and (= |#memory_$Pointer$.offset| (store |v_#memory_$Pointer$.offset_87| |v_ULTIMATE.start_main_~p~0#1.base_129| (store (select |v_#memory_$Pointer$.offset_87| |v_ULTIMATE.start_main_~p~0#1.base_129|) (+ 4 |v_ULTIMATE.start_main_~p~0#1.offset_108|) 0))) (= |#memory_int| (store |v_#memory_int_77| |v_ULTIMATE.start_main_~p~0#1.base_129| (store (store (select |v_#memory_int_77| |v_ULTIMATE.start_main_~p~0#1.base_129|) |v_ULTIMATE.start_main_~p~0#1.offset_108| 3) (+ 4 |v_ULTIMATE.start_main_~p~0#1.offset_108|) (select (select |#memory_int| |v_ULTIMATE.start_main_~p~0#1.base_129|) (+ 4 |v_ULTIMATE.start_main_~p~0#1.offset_108|))))) (= (store |v_#memory_$Pointer$.base_87| |v_ULTIMATE.start_main_~p~0#1.base_129| (store (select |v_#memory_$Pointer$.base_87| |v_ULTIMATE.start_main_~p~0#1.base_129|) |v_ULTIMATE.start_main_~p~0#1.offset_108| (select (select |v_#memory_$Pointer$.base_88| |v_ULTIMATE.start_main_~p~0#1.base_129|) |v_ULTIMATE.start_main_~p~0#1.offset_108|))) |v_#memory_$Pointer$.base_88|) (= |#memory_$Pointer$.base| (store |v_#memory_$Pointer$.base_88| |v_ULTIMATE.start_main_~p~0#1.base_129| (store (select |v_#memory_$Pointer$.base_88| |v_ULTIMATE.start_main_~p~0#1.base_129|) (+ 4 |v_ULTIMATE.start_main_~p~0#1.offset_108|) 0))) (= (select |#valid| |v_ULTIMATE.start_main_~p~0#1.base_129|) 1) (= (store |v_#memory_$Pointer$.offset_86| |v_ULTIMATE.start_main_~p~0#1.base_129| (store (select |v_#memory_$Pointer$.offset_86| |v_ULTIMATE.start_main_~p~0#1.base_129|) |v_ULTIMATE.start_main_~p~0#1.offset_108| (select (select |v_#memory_$Pointer$.offset_87| |v_ULTIMATE.start_main_~p~0#1.base_129|) |v_ULTIMATE.start_main_~p~0#1.offset_108|))) |v_#memory_$Pointer$.offset_87|) (<= (+ 8 |v_ULTIMATE.start_main_~p~0#1.offset_108|) (select |#length| |v_ULTIMATE.start_main_~p~0#1.base_129|)) (<= 0 |v_ULTIMATE.start_main_~p~0#1.offset_108|))) (= |ULTIMATE.start_main_~i~0#1| 0) (exists ((|v_ULTIMATE.start_main_~y~0#1_39| Int) (|v_ULTIMATE.start_main_#t~nondet9#1_45| Int) (|v_ULTIMATE.start_main_#t~short10#1_16| Bool) (|v_ULTIMATE.start_main_#t~nondet9#1_46| Int)) (and (or (and |v_ULTIMATE.start_main_#t~short10#1_16| (= |v_ULTIMATE.start_main_#t~nondet9#1_46| 0)) (and (not |v_ULTIMATE.start_main_#t~short10#1_16|) (= |v_ULTIMATE.start_main_#t~nondet9#1_46| |v_ULTIMATE.start_main_#t~nondet9#1_45|))) (or (and |v_ULTIMATE.start_main_#t~short10#1_16| (<= |v_ULTIMATE.start_main_~y~0#1_39| 9)) (and (<= 10 |v_ULTIMATE.start_main_~y~0#1_39|) (not |v_ULTIMATE.start_main_#t~short10#1_16|))))) (= |ULTIMATE.start_main_~a~0#1.offset| |ULTIMATE.start_main_~p~0#1.offset|) (= |ULTIMATE.start_main_~a~0#1.base| |ULTIMATE.start_main_~p~0#1.base|)) (exists ((|v_ULTIMATE.start_main_~p~0#1.offset_112| Int) (|v_ULTIMATE.start_main_~p~0#1.base_133| Int)) (and (<= 0 |ULTIMATE.start_main_~a~0#1.offset|) (<= 1 |ULTIMATE.start_main_~i~0#1|) (<= (+ 8 |v_ULTIMATE.start_main_~p~0#1.offset_112|) (select |#length| |v_ULTIMATE.start_main_~p~0#1.base_133|)) (= (select (select |#memory_$Pointer$.base| |v_ULTIMATE.start_main_~p~0#1.base_133|) (+ 4 |v_ULTIMATE.start_main_~p~0#1.offset_112|)) |ULTIMATE.start_main_~p~0#1.base|) (= (select |#valid| |v_ULTIMATE.start_main_~p~0#1.base_133|) 1) (<= 0 |v_ULTIMATE.start_main_~p~0#1.offset_112|) (= (select (select |#memory_$Pointer$.offset| |v_ULTIMATE.start_main_~p~0#1.base_133|) (+ 4 |v_ULTIMATE.start_main_~p~0#1.offset_112|)) |ULTIMATE.start_main_~p~0#1.offset|)))) (or (< |ULTIMATE.start_main_~p~0#1.offset| 0) (< (select |#length| |ULTIMATE.start_main_~p~0#1.base|) (+ |ULTIMATE.start_main_~p~0#1.offset| 4))))' at error location [2023-11-06 21:04:40,963 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-06 21:04:40,964 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-06 21:04:40,964 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7, 7] total 21 [2023-11-06 21:04:40,965 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1711069383] [2023-11-06 21:04:40,965 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-06 21:04:40,965 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2023-11-06 21:04:40,965 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-06 21:04:40,966 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2023-11-06 21:04:40,967 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=111, Invalid=951, Unknown=2, NotChecked=126, Total=1190 [2023-11-06 21:04:40,967 INFO L87 Difference]: Start difference. First operand 105 states and 121 transitions. Second operand has 23 states, 22 states have (on average 2.5) internal successors, (55), 22 states have internal predecessors, (55), 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)