./Ultimate.py --spec ../../sv-benchmarks/c/properties/valid-memsafety.prp --file ../../sv-benchmarks/c/list-ext3-properties/sll_of_sll_nondet_append-1.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for memory safety (deref-memtrack) Using default analysis Version 0e0057cc 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_f0bfdaf3-5b1c-4197-b2a8-f0c22aad57c8/bin/utaipan-verify-nQ1chXbOIh/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0bfdaf3-5b1c-4197-b2a8-f0c22aad57c8/bin/utaipan-verify-nQ1chXbOIh/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0bfdaf3-5b1c-4197-b2a8-f0c22aad57c8/bin/utaipan-verify-nQ1chXbOIh/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0bfdaf3-5b1c-4197-b2a8-f0c22aad57c8/bin/utaipan-verify-nQ1chXbOIh/config/TaipanMemDerefMemtrack.xml -i ../../sv-benchmarks/c/list-ext3-properties/sll_of_sll_nondet_append-1.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0bfdaf3-5b1c-4197-b2a8-f0c22aad57c8/bin/utaipan-verify-nQ1chXbOIh/config/svcomp-DerefFreeMemtrack-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0bfdaf3-5b1c-4197-b2a8-f0c22aad57c8/bin/utaipan-verify-nQ1chXbOIh --witnessprinter.witness.filename witness --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 fabf091179f48b7141dc193b5040f4974c042bd8a2afb03b99137d693bf63ce7 --- Real Ultimate output --- This is Ultimate 0.2.4-dev-0e0057c [2023-12-02 12:29:28,261 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-12-02 12:29:28,326 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0bfdaf3-5b1c-4197-b2a8-f0c22aad57c8/bin/utaipan-verify-nQ1chXbOIh/config/svcomp-DerefFreeMemtrack-32bit-Taipan_Default.epf [2023-12-02 12:29:28,331 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-12-02 12:29:28,332 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-12-02 12:29:28,358 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-12-02 12:29:28,358 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-12-02 12:29:28,359 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-12-02 12:29:28,359 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-12-02 12:29:28,360 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-12-02 12:29:28,361 INFO L153 SettingsManager]: * User list type=DISABLED [2023-12-02 12:29:28,361 INFO L151 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-12-02 12:29:28,361 INFO L153 SettingsManager]: * Explicit value domain=true [2023-12-02 12:29:28,362 INFO L153 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-12-02 12:29:28,362 INFO L153 SettingsManager]: * Octagon Domain=false [2023-12-02 12:29:28,363 INFO L153 SettingsManager]: * Abstract domain=CompoundDomain [2023-12-02 12:29:28,363 INFO L153 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-12-02 12:29:28,364 INFO L153 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-12-02 12:29:28,364 INFO L153 SettingsManager]: * Interval Domain=false [2023-12-02 12:29:28,365 INFO L151 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-12-02 12:29:28,365 INFO L153 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-12-02 12:29:28,366 INFO L153 SettingsManager]: * Simplification Technique=POLY_PAC [2023-12-02 12:29:28,367 INFO L151 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2023-12-02 12:29:28,367 INFO L153 SettingsManager]: * Create parallel compositions if possible=false [2023-12-02 12:29:28,368 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-12-02 12:29:28,368 INFO L153 SettingsManager]: * sizeof long=4 [2023-12-02 12:29:28,369 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-12-02 12:29:28,369 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-12-02 12:29:28,370 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-12-02 12:29:28,370 INFO L153 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2023-12-02 12:29:28,370 INFO L153 SettingsManager]: * Bitprecise bitfields=true [2023-12-02 12:29:28,371 INFO L153 SettingsManager]: * SV-COMP memtrack compatibility mode=true [2023-12-02 12:29:28,371 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-12-02 12:29:28,371 INFO L153 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2023-12-02 12:29:28,372 INFO L153 SettingsManager]: * Check unreachability of reach_error function=false [2023-12-02 12:29:28,372 INFO L153 SettingsManager]: * sizeof long double=12 [2023-12-02 12:29:28,372 INFO L153 SettingsManager]: * Use constant arrays=true [2023-12-02 12:29:28,372 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-12-02 12:29:28,373 INFO L153 SettingsManager]: * Only consider context switches at boundaries of atomic blocks=true [2023-12-02 12:29:28,373 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-12-02 12:29:28,373 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-12-02 12:29:28,373 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-12-02 12:29:28,374 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-12-02 12:29:28,374 INFO L153 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-12-02 12:29:28,374 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-12-02 12:29:28,374 INFO L153 SettingsManager]: * Apply one-shot large block encoding in concurrent analysis=false [2023-12-02 12:29:28,374 INFO L153 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-12-02 12:29:28,375 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-12-02 12:29:28,375 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_f0bfdaf3-5b1c-4197-b2a8-f0c22aad57c8/bin/utaipan-verify-nQ1chXbOIh/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0bfdaf3-5b1c-4197-b2a8-f0c22aad57c8/bin/utaipan-verify-nQ1chXbOIh Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> fabf091179f48b7141dc193b5040f4974c042bd8a2afb03b99137d693bf63ce7 [2023-12-02 12:29:28,603 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-12-02 12:29:28,622 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-12-02 12:29:28,625 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-12-02 12:29:28,626 INFO L270 PluginConnector]: Initializing CDTParser... [2023-12-02 12:29:28,626 INFO L274 PluginConnector]: CDTParser initialized [2023-12-02 12:29:28,627 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0bfdaf3-5b1c-4197-b2a8-f0c22aad57c8/bin/utaipan-verify-nQ1chXbOIh/../../sv-benchmarks/c/list-ext3-properties/sll_of_sll_nondet_append-1.i [2023-12-02 12:29:31,470 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-12-02 12:29:31,688 INFO L384 CDTParser]: Found 1 translation units. [2023-12-02 12:29:31,689 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0bfdaf3-5b1c-4197-b2a8-f0c22aad57c8/sv-benchmarks/c/list-ext3-properties/sll_of_sll_nondet_append-1.i [2023-12-02 12:29:31,704 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0bfdaf3-5b1c-4197-b2a8-f0c22aad57c8/bin/utaipan-verify-nQ1chXbOIh/data/2ed32364a/9f04e9ffe6f54824b7002b4a9902ab00/FLAG007521ef9 [2023-12-02 12:29:31,717 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0bfdaf3-5b1c-4197-b2a8-f0c22aad57c8/bin/utaipan-verify-nQ1chXbOIh/data/2ed32364a/9f04e9ffe6f54824b7002b4a9902ab00 [2023-12-02 12:29:31,719 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-12-02 12:29:31,720 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-12-02 12:29:31,722 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-12-02 12:29:31,722 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-12-02 12:29:31,727 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-12-02 12:29:31,728 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.12 12:29:31" (1/1) ... [2023-12-02 12:29:31,729 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@1dbd546b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 12:29:31, skipping insertion in model container [2023-12-02 12:29:31,730 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.12 12:29:31" (1/1) ... [2023-12-02 12:29:31,773 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-12-02 12:29:32,067 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-12-02 12:29:32,077 INFO L202 MainTranslator]: Completed pre-run [2023-12-02 12:29:32,120 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-12-02 12:29:32,152 INFO L206 MainTranslator]: Completed translation [2023-12-02 12:29:32,153 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 12:29:32 WrapperNode [2023-12-02 12:29:32,153 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-12-02 12:29:32,154 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-12-02 12:29:32,154 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-12-02 12:29:32,155 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-12-02 12:29:32,162 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 12:29:32" (1/1) ... [2023-12-02 12:29:32,176 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 12:29:32" (1/1) ... [2023-12-02 12:29:32,202 INFO L138 Inliner]: procedures = 129, calls = 40, calls flagged for inlining = 8, calls inlined = 8, statements flattened = 192 [2023-12-02 12:29:32,203 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-12-02 12:29:32,203 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-12-02 12:29:32,204 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-12-02 12:29:32,204 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-12-02 12:29:32,213 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 12:29:32" (1/1) ... [2023-12-02 12:29:32,214 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 12:29:32" (1/1) ... [2023-12-02 12:29:32,218 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 12:29:32" (1/1) ... [2023-12-02 12:29:32,218 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 12:29:32" (1/1) ... [2023-12-02 12:29:32,241 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 12:29:32" (1/1) ... [2023-12-02 12:29:32,246 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 12:29:32" (1/1) ... [2023-12-02 12:29:32,248 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 12:29:32" (1/1) ... [2023-12-02 12:29:32,250 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 12:29:32" (1/1) ... [2023-12-02 12:29:32,254 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-12-02 12:29:32,255 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-12-02 12:29:32,255 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-12-02 12:29:32,255 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-12-02 12:29:32,256 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 12:29:32" (1/1) ... [2023-12-02 12:29:32,262 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-12-02 12:29:32,273 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0bfdaf3-5b1c-4197-b2a8-f0c22aad57c8/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 12:29:32,286 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0bfdaf3-5b1c-4197-b2a8-f0c22aad57c8/bin/utaipan-verify-nQ1chXbOIh/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-12-02 12:29:32,289 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0bfdaf3-5b1c-4197-b2a8-f0c22aad57c8/bin/utaipan-verify-nQ1chXbOIh/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-12-02 12:29:32,318 INFO L130 BoogieDeclarations]: Found specification of procedure myexit [2023-12-02 12:29:32,319 INFO L138 BoogieDeclarations]: Found implementation of procedure myexit [2023-12-02 12:29:32,319 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2023-12-02 12:29:32,319 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-12-02 12:29:32,319 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2023-12-02 12:29:32,320 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2023-12-02 12:29:32,320 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2023-12-02 12:29:32,320 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-12-02 12:29:32,320 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~$Pointer$ [2023-12-02 12:29:32,320 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-12-02 12:29:32,320 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-12-02 12:29:32,321 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-12-02 12:29:32,446 INFO L241 CfgBuilder]: Building ICFG [2023-12-02 12:29:32,448 INFO L267 CfgBuilder]: Building CFG for each procedure with an implementation [2023-12-02 12:29:32,472 INFO L775 $ProcedureCfgBuilder]: dead code at ProgramPoint myexitFINAL: assume true; [2023-12-02 12:29:32,771 INFO L282 CfgBuilder]: Performing block encoding [2023-12-02 12:29:32,833 INFO L304 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-12-02 12:29:32,833 INFO L309 CfgBuilder]: Removed 9 assume(true) statements. [2023-12-02 12:29:32,834 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.12 12:29:32 BoogieIcfgContainer [2023-12-02 12:29:32,834 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-12-02 12:29:32,837 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-12-02 12:29:32,837 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-12-02 12:29:32,840 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-12-02 12:29:32,841 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.12 12:29:31" (1/3) ... [2023-12-02 12:29:32,841 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@48fa1dea and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.12 12:29:32, skipping insertion in model container [2023-12-02 12:29:32,841 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 12:29:32" (2/3) ... [2023-12-02 12:29:32,842 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@48fa1dea and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.12 12:29:32, skipping insertion in model container [2023-12-02 12:29:32,842 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.12 12:29:32" (3/3) ... [2023-12-02 12:29:32,843 INFO L112 eAbstractionObserver]: Analyzing ICFG sll_of_sll_nondet_append-1.i [2023-12-02 12:29:32,862 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-12-02 12:29:32,862 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 42 error locations. [2023-12-02 12:29:32,904 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-12-02 12:29:32,909 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;@654a9499, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-12-02 12:29:32,909 INFO L358 AbstractCegarLoop]: Starting to check reachability of 42 error locations. [2023-12-02 12:29:32,914 INFO L276 IsEmpty]: Start isEmpty. Operand has 97 states, 52 states have (on average 2.173076923076923) internal successors, (113), 95 states have internal predecessors, (113), 2 states have call successors, (2), 1 states have call predecessors, (2), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 12:29:32,919 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2023-12-02 12:29:32,920 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 12:29:32,920 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1] [2023-12-02 12:29:32,921 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr18REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 39 more)] === [2023-12-02 12:29:32,926 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 12:29:32,926 INFO L85 PathProgramCache]: Analyzing trace with hash 316076, now seen corresponding path program 1 times [2023-12-02 12:29:32,935 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 12:29:32,936 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [929650424] [2023-12-02 12:29:32,936 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 12:29:32,936 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 12:29:33,015 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 12:29:33,128 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 12:29:33,128 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 12:29:33,129 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [929650424] [2023-12-02 12:29:33,129 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [929650424] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 12:29:33,130 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 12:29:33,130 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-12-02 12:29:33,131 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1612991701] [2023-12-02 12:29:33,132 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 12:29:33,135 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 12:29:33,135 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 12:29:33,164 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 12:29:33,165 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-12-02 12:29:33,167 INFO L87 Difference]: Start difference. First operand has 97 states, 52 states have (on average 2.173076923076923) internal successors, (113), 95 states have internal predecessors, (113), 2 states have call successors, (2), 1 states have call predecessors, (2), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 3 states, 3 states have (on average 1.0) internal successors, (3), 2 states have internal predecessors, (3), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 12:29:33,283 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 12:29:33,284 INFO L93 Difference]: Finished difference Result 136 states and 156 transitions. [2023-12-02 12:29:33,285 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 12:29:33,286 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 1.0) internal successors, (3), 2 states have internal predecessors, (3), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 3 [2023-12-02 12:29:33,286 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 12:29:33,294 INFO L225 Difference]: With dead ends: 136 [2023-12-02 12:29:33,294 INFO L226 Difference]: Without dead ends: 129 [2023-12-02 12:29:33,296 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-12-02 12:29:33,299 INFO L413 NwaCegarLoop]: 83 mSDtfsCounter, 43 mSDsluCounter, 74 mSDsCounter, 0 mSdLazyCounter, 62 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 43 SdHoareTripleChecker+Valid, 157 SdHoareTripleChecker+Invalid, 62 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 62 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 12:29:33,300 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [43 Valid, 157 Invalid, 62 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 62 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 12:29:33,317 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 129 states. [2023-12-02 12:29:33,357 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 129 to 92. [2023-12-02 12:29:33,359 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 92 states, 50 states have (on average 2.08) internal successors, (104), 91 states have internal predecessors, (104), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 12:29:33,361 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 92 states to 92 states and 104 transitions. [2023-12-02 12:29:33,362 INFO L78 Accepts]: Start accepts. Automaton has 92 states and 104 transitions. Word has length 3 [2023-12-02 12:29:33,363 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 12:29:33,363 INFO L495 AbstractCegarLoop]: Abstraction has 92 states and 104 transitions. [2023-12-02 12:29:33,363 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 1.0) internal successors, (3), 2 states have internal predecessors, (3), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 12:29:33,363 INFO L276 IsEmpty]: Start isEmpty. Operand 92 states and 104 transitions. [2023-12-02 12:29:33,364 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2023-12-02 12:29:33,364 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 12:29:33,364 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2023-12-02 12:29:33,364 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-12-02 12:29:33,364 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr18REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 39 more)] === [2023-12-02 12:29:33,366 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 12:29:33,366 INFO L85 PathProgramCache]: Analyzing trace with hash 353284292, now seen corresponding path program 1 times [2023-12-02 12:29:33,366 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 12:29:33,366 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1987633629] [2023-12-02 12:29:33,366 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 12:29:33,367 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 12:29:33,383 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 12:29:33,441 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 12:29:33,441 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 12:29:33,441 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1987633629] [2023-12-02 12:29:33,441 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1987633629] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 12:29:33,442 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 12:29:33,442 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-12-02 12:29:33,442 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [904756649] [2023-12-02 12:29:33,442 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 12:29:33,443 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 12:29:33,443 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 12:29:33,444 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 12:29:33,444 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-12-02 12:29:33,444 INFO L87 Difference]: Start difference. First operand 92 states and 104 transitions. Second operand has 3 states, 2 states have (on average 3.5) internal successors, (7), 2 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 12:29:33,542 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 12:29:33,542 INFO L93 Difference]: Finished difference Result 113 states and 127 transitions. [2023-12-02 12:29:33,543 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 12:29:33,543 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 3.5) internal successors, (7), 2 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 7 [2023-12-02 12:29:33,543 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 12:29:33,544 INFO L225 Difference]: With dead ends: 113 [2023-12-02 12:29:33,545 INFO L226 Difference]: Without dead ends: 113 [2023-12-02 12:29:33,545 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-12-02 12:29:33,546 INFO L413 NwaCegarLoop]: 51 mSDtfsCounter, 89 mSDsluCounter, 13 mSDsCounter, 0 mSdLazyCounter, 63 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 89 SdHoareTripleChecker+Valid, 64 SdHoareTripleChecker+Invalid, 66 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 63 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 12:29:33,547 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [89 Valid, 64 Invalid, 66 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 63 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 12:29:33,548 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 113 states. [2023-12-02 12:29:33,554 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 113 to 90. [2023-12-02 12:29:33,554 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 90 states, 50 states have (on average 2.04) internal successors, (102), 89 states have internal predecessors, (102), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 12:29:33,556 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 90 states to 90 states and 102 transitions. [2023-12-02 12:29:33,556 INFO L78 Accepts]: Start accepts. Automaton has 90 states and 102 transitions. Word has length 7 [2023-12-02 12:29:33,556 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 12:29:33,557 INFO L495 AbstractCegarLoop]: Abstraction has 90 states and 102 transitions. [2023-12-02 12:29:33,557 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 3.5) internal successors, (7), 2 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 12:29:33,557 INFO L276 IsEmpty]: Start isEmpty. Operand 90 states and 102 transitions. [2023-12-02 12:29:33,557 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2023-12-02 12:29:33,557 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 12:29:33,558 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2023-12-02 12:29:33,558 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2023-12-02 12:29:33,558 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr19REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 39 more)] === [2023-12-02 12:29:33,558 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 12:29:33,559 INFO L85 PathProgramCache]: Analyzing trace with hash 353284293, now seen corresponding path program 1 times [2023-12-02 12:29:33,559 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 12:29:33,559 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1357217875] [2023-12-02 12:29:33,559 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 12:29:33,559 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 12:29:33,574 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 12:29:33,642 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 12:29:33,642 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 12:29:33,642 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1357217875] [2023-12-02 12:29:33,642 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1357217875] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 12:29:33,643 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1974960490] [2023-12-02 12:29:33,643 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 12:29:33,643 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 12:29:33,643 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0bfdaf3-5b1c-4197-b2a8-f0c22aad57c8/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 12:29:33,653 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0bfdaf3-5b1c-4197-b2a8-f0c22aad57c8/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 12:29:33,661 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0bfdaf3-5b1c-4197-b2a8-f0c22aad57c8/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-12-02 12:29:33,723 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 12:29:33,725 INFO L262 TraceCheckSpWp]: Trace formula consists of 50 conjuncts, 5 conjunts are in the unsatisfiable core [2023-12-02 12:29:33,729 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 12:29:33,793 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 12:29:33,793 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 12:29:33,815 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 12:29:33,816 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1974960490] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 12:29:33,816 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1793938614] [2023-12-02 12:29:33,832 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2023-12-02 12:29:33,833 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 12:29:33,837 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 12:29:33,841 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 12:29:33,842 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 12:29:34,306 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 12:29:34,433 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '580#(and (<= 1 |#StackHeapBarrier|) (<= (select |#length| |ULTIMATE.start_main_~#head~1#1.base|) 3) (= 5 |ULTIMATE.start_main_~max~0#1|) (= |ULTIMATE.start_main_~#head~1#1.offset| 0) (= 3 |ULTIMATE.start_main_~min~0#1|) (<= 2 |ULTIMATE.start_main_~#head~1#1.base|) (<= 6 |ULTIMATE.start_main_~i~0#1|))' at error location [2023-12-02 12:29:34,434 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 12:29:34,434 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 12:29:34,434 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3, 3] total 6 [2023-12-02 12:29:34,434 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [111260255] [2023-12-02 12:29:34,435 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 12:29:34,435 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-12-02 12:29:34,435 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 12:29:34,436 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-12-02 12:29:34,436 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=93, Unknown=0, NotChecked=0, Total=132 [2023-12-02 12:29:34,436 INFO L87 Difference]: Start difference. First operand 90 states and 102 transitions. Second operand has 7 states, 7 states have (on average 2.7142857142857144) internal successors, (19), 6 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 12:29:34,594 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 12:29:34,594 INFO L93 Difference]: Finished difference Result 201 states and 222 transitions. [2023-12-02 12:29:34,594 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-12-02 12:29:34,594 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 2.7142857142857144) internal successors, (19), 6 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 7 [2023-12-02 12:29:34,595 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 12:29:34,596 INFO L225 Difference]: With dead ends: 201 [2023-12-02 12:29:34,596 INFO L226 Difference]: Without dead ends: 201 [2023-12-02 12:29:34,597 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 11 SyntacticMatches, 1 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 41 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=39, Invalid=93, Unknown=0, NotChecked=0, Total=132 [2023-12-02 12:29:34,598 INFO L413 NwaCegarLoop]: 94 mSDtfsCounter, 284 mSDsluCounter, 150 mSDsCounter, 0 mSdLazyCounter, 110 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 284 SdHoareTripleChecker+Valid, 244 SdHoareTripleChecker+Invalid, 115 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 110 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 12:29:34,598 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [284 Valid, 244 Invalid, 115 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 110 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 12:29:34,599 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 201 states. [2023-12-02 12:29:34,607 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 201 to 133. [2023-12-02 12:29:34,608 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 133 states, 93 states have (on average 2.043010752688172) internal successors, (190), 132 states have internal predecessors, (190), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 12:29:34,610 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 133 states to 133 states and 190 transitions. [2023-12-02 12:29:34,610 INFO L78 Accepts]: Start accepts. Automaton has 133 states and 190 transitions. Word has length 7 [2023-12-02 12:29:34,610 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 12:29:34,610 INFO L495 AbstractCegarLoop]: Abstraction has 133 states and 190 transitions. [2023-12-02 12:29:34,611 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 2.7142857142857144) internal successors, (19), 6 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 12:29:34,611 INFO L276 IsEmpty]: Start isEmpty. Operand 133 states and 190 transitions. [2023-12-02 12:29:34,611 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2023-12-02 12:29:34,611 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 12:29:34,611 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 12:29:34,622 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0bfdaf3-5b1c-4197-b2a8-f0c22aad57c8/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2023-12-02 12:29:34,816 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0bfdaf3-5b1c-4197-b2a8-f0c22aad57c8/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 12:29:34,817 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 39 more)] === [2023-12-02 12:29:34,817 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 12:29:34,817 INFO L85 PathProgramCache]: Analyzing trace with hash -1933963528, now seen corresponding path program 1 times [2023-12-02 12:29:34,817 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 12:29:34,818 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1276601553] [2023-12-02 12:29:34,818 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 12:29:34,818 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 12:29:34,833 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 12:29:34,923 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 12:29:34,924 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 12:29:34,924 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1276601553] [2023-12-02 12:29:34,924 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1276601553] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 12:29:34,924 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 12:29:34,925 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-12-02 12:29:34,925 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1719151405] [2023-12-02 12:29:34,925 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 12:29:34,925 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-12-02 12:29:34,925 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 12:29:34,926 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-12-02 12:29:34,926 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2023-12-02 12:29:34,926 INFO L87 Difference]: Start difference. First operand 133 states and 190 transitions. Second operand has 5 states, 5 states have (on average 1.6) internal successors, (8), 4 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 12:29:35,040 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 12:29:35,040 INFO L93 Difference]: Finished difference Result 156 states and 195 transitions. [2023-12-02 12:29:35,041 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-12-02 12:29:35,041 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 1.6) internal successors, (8), 4 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 8 [2023-12-02 12:29:35,041 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 12:29:35,042 INFO L225 Difference]: With dead ends: 156 [2023-12-02 12:29:35,042 INFO L226 Difference]: Without dead ends: 156 [2023-12-02 12:29:35,042 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2023-12-02 12:29:35,044 INFO L413 NwaCegarLoop]: 73 mSDtfsCounter, 65 mSDsluCounter, 213 mSDsCounter, 0 mSdLazyCounter, 117 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 65 SdHoareTripleChecker+Valid, 286 SdHoareTripleChecker+Invalid, 117 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 117 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 12:29:35,044 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [65 Valid, 286 Invalid, 117 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 117 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 12:29:35,045 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 156 states. [2023-12-02 12:29:35,051 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 156 to 134. [2023-12-02 12:29:35,051 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 134 states, 94 states have (on average 2.0319148936170213) internal successors, (191), 133 states have internal predecessors, (191), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 12:29:35,053 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 134 states to 134 states and 191 transitions. [2023-12-02 12:29:35,053 INFO L78 Accepts]: Start accepts. Automaton has 134 states and 191 transitions. Word has length 8 [2023-12-02 12:29:35,053 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 12:29:35,053 INFO L495 AbstractCegarLoop]: Abstraction has 134 states and 191 transitions. [2023-12-02 12:29:35,053 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 1.6) internal successors, (8), 4 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 12:29:35,053 INFO L276 IsEmpty]: Start isEmpty. Operand 134 states and 191 transitions. [2023-12-02 12:29:35,054 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2023-12-02 12:29:35,054 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 12:29:35,054 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 12:29:35,054 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2023-12-02 12:29:35,054 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 39 more)] === [2023-12-02 12:29:35,055 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 12:29:35,055 INFO L85 PathProgramCache]: Analyzing trace with hash 176427374, now seen corresponding path program 1 times [2023-12-02 12:29:35,055 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 12:29:35,055 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1703938304] [2023-12-02 12:29:35,055 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 12:29:35,056 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 12:29:35,067 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 12:29:35,099 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 12:29:35,100 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 12:29:35,100 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1703938304] [2023-12-02 12:29:35,100 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1703938304] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 12:29:35,100 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 12:29:35,100 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-12-02 12:29:35,101 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1447289725] [2023-12-02 12:29:35,101 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 12:29:35,101 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 12:29:35,101 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 12:29:35,102 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 12:29:35,102 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-12-02 12:29:35,102 INFO L87 Difference]: Start difference. First operand 134 states and 191 transitions. Second operand has 3 states, 2 states have (on average 4.5) internal successors, (9), 3 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 12:29:35,180 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 12:29:35,181 INFO L93 Difference]: Finished difference Result 133 states and 188 transitions. [2023-12-02 12:29:35,181 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 12:29:35,181 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 4.5) internal successors, (9), 3 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 9 [2023-12-02 12:29:35,181 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 12:29:35,182 INFO L225 Difference]: With dead ends: 133 [2023-12-02 12:29:35,182 INFO L226 Difference]: Without dead ends: 133 [2023-12-02 12:29:35,183 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-12-02 12:29:35,184 INFO L413 NwaCegarLoop]: 75 mSDtfsCounter, 1 mSDsluCounter, 49 mSDsCounter, 0 mSdLazyCounter, 73 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 124 SdHoareTripleChecker+Invalid, 73 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 73 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 12:29:35,184 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1 Valid, 124 Invalid, 73 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 73 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 12:29:35,185 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 133 states. [2023-12-02 12:29:35,189 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 133 to 133. [2023-12-02 12:29:35,190 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 133 states, 94 states have (on average 2.0) internal successors, (188), 132 states have internal predecessors, (188), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 12:29:35,191 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 133 states to 133 states and 188 transitions. [2023-12-02 12:29:35,191 INFO L78 Accepts]: Start accepts. Automaton has 133 states and 188 transitions. Word has length 9 [2023-12-02 12:29:35,191 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 12:29:35,191 INFO L495 AbstractCegarLoop]: Abstraction has 133 states and 188 transitions. [2023-12-02 12:29:35,192 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 4.5) internal successors, (9), 3 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 12:29:35,192 INFO L276 IsEmpty]: Start isEmpty. Operand 133 states and 188 transitions. [2023-12-02 12:29:35,192 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2023-12-02 12:29:35,192 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 12:29:35,193 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 12:29:35,193 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2023-12-02 12:29:35,193 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 39 more)] === [2023-12-02 12:29:35,193 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 12:29:35,193 INFO L85 PathProgramCache]: Analyzing trace with hash 176427375, now seen corresponding path program 1 times [2023-12-02 12:29:35,194 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 12:29:35,194 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1428092113] [2023-12-02 12:29:35,194 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 12:29:35,194 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 12:29:35,206 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 12:29:35,258 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 12:29:35,258 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 12:29:35,258 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1428092113] [2023-12-02 12:29:35,258 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1428092113] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 12:29:35,259 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 12:29:35,259 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-12-02 12:29:35,259 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1396182969] [2023-12-02 12:29:35,259 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 12:29:35,259 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 12:29:35,259 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 12:29:35,260 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 12:29:35,260 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-12-02 12:29:35,260 INFO L87 Difference]: Start difference. First operand 133 states and 188 transitions. Second operand has 3 states, 2 states have (on average 4.5) internal successors, (9), 3 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 12:29:35,339 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 12:29:35,339 INFO L93 Difference]: Finished difference Result 132 states and 185 transitions. [2023-12-02 12:29:35,339 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 12:29:35,339 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 4.5) internal successors, (9), 3 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 9 [2023-12-02 12:29:35,340 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 12:29:35,340 INFO L225 Difference]: With dead ends: 132 [2023-12-02 12:29:35,341 INFO L226 Difference]: Without dead ends: 132 [2023-12-02 12:29:35,341 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-12-02 12:29:35,342 INFO L413 NwaCegarLoop]: 75 mSDtfsCounter, 0 mSDsluCounter, 52 mSDsCounter, 0 mSdLazyCounter, 69 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 127 SdHoareTripleChecker+Invalid, 69 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 69 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 12:29:35,342 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 127 Invalid, 69 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 69 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 12:29:35,343 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 132 states. [2023-12-02 12:29:35,348 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 132 to 132. [2023-12-02 12:29:35,349 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 132 states, 94 states have (on average 1.9680851063829787) internal successors, (185), 131 states have internal predecessors, (185), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 12:29:35,350 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 132 states to 132 states and 185 transitions. [2023-12-02 12:29:35,350 INFO L78 Accepts]: Start accepts. Automaton has 132 states and 185 transitions. Word has length 9 [2023-12-02 12:29:35,350 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 12:29:35,351 INFO L495 AbstractCegarLoop]: Abstraction has 132 states and 185 transitions. [2023-12-02 12:29:35,351 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 4.5) internal successors, (9), 3 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 12:29:35,351 INFO L276 IsEmpty]: Start isEmpty. Operand 132 states and 185 transitions. [2023-12-02 12:29:35,352 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2023-12-02 12:29:35,352 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 12:29:35,352 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 12:29:35,352 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2023-12-02 12:29:35,353 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 39 more)] === [2023-12-02 12:29:35,353 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 12:29:35,353 INFO L85 PathProgramCache]: Analyzing trace with hash 2043200796, now seen corresponding path program 1 times [2023-12-02 12:29:35,353 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 12:29:35,353 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [31828603] [2023-12-02 12:29:35,354 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 12:29:35,354 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 12:29:35,368 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 12:29:35,450 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 12:29:35,450 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 12:29:35,451 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [31828603] [2023-12-02 12:29:35,451 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [31828603] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 12:29:35,451 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2143811794] [2023-12-02 12:29:35,451 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 12:29:35,451 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 12:29:35,451 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0bfdaf3-5b1c-4197-b2a8-f0c22aad57c8/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 12:29:35,452 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0bfdaf3-5b1c-4197-b2a8-f0c22aad57c8/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 12:29:35,457 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0bfdaf3-5b1c-4197-b2a8-f0c22aad57c8/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-12-02 12:29:35,538 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 12:29:35,539 INFO L262 TraceCheckSpWp]: Trace formula consists of 129 conjuncts, 10 conjunts are in the unsatisfiable core [2023-12-02 12:29:35,540 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 12:29:35,589 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 12:29:35,589 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 12:29:35,637 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 12:29:35,637 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2143811794] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 12:29:35,637 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [668557709] [2023-12-02 12:29:35,640 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2023-12-02 12:29:35,640 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 12:29:35,640 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 12:29:35,641 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 12:29:35,641 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 12:29:36,921 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 12:29:37,987 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1824#(and (= 3 |ULTIMATE.start_node_create_with_sublist_#in~sublist_length#1|) (<= 1 |#StackHeapBarrier|) (= 3 |ULTIMATE.start_sll_append_#in~sublist_length#1|) (not (= (select |#valid| |ULTIMATE.start_node_create_with_sublist_~new_node~0#1.base|) 1)) (= |ULTIMATE.start_sll_append_~sublist_length#1| 3) (= 3 |ULTIMATE.start_main_~i~0#1|) (= 5 |ULTIMATE.start_main_~max~0#1|) (<= 2 |ULTIMATE.start_sll_append_#in~head#1.base|) (= |ULTIMATE.start_node_create_with_sublist_#t~ret6#1.base| |ULTIMATE.start_sll_create_#res#1.base|) (= |ULTIMATE.start_main_~#head~1#1.offset| 0) (= |ULTIMATE.start_sll_append_~head#1.offset| 0) (= |ULTIMATE.start_sll_create_#res#1.offset| 0) (= |ULTIMATE.start_node_create_with_sublist_~sublist_length#1| 3) (= |ULTIMATE.start_node_create_with_sublist_~new_node~0#1.offset| 0) (= 3 |ULTIMATE.start_main_~min~0#1|) (<= 2 |ULTIMATE.start_sll_append_~head#1.base|) (<= 2 |ULTIMATE.start_main_~#head~1#1.base|) (= |ULTIMATE.start_main_~j~0#1| 0) (= |ULTIMATE.start_sll_append_#in~head#1.offset| 0) (= 0 |ULTIMATE.start_node_create_with_sublist_#t~ret6#1.offset|))' at error location [2023-12-02 12:29:37,988 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 12:29:37,988 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 12:29:37,988 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 9 [2023-12-02 12:29:37,988 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [881634336] [2023-12-02 12:29:37,988 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 12:29:37,989 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2023-12-02 12:29:37,989 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 12:29:37,989 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2023-12-02 12:29:37,990 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=80, Invalid=226, Unknown=0, NotChecked=0, Total=306 [2023-12-02 12:29:37,990 INFO L87 Difference]: Start difference. First operand 132 states and 185 transitions. Second operand has 10 states, 10 states have (on average 2.5) internal successors, (25), 9 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 12:29:38,282 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 12:29:38,282 INFO L93 Difference]: Finished difference Result 219 states and 264 transitions. [2023-12-02 12:29:38,282 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2023-12-02 12:29:38,282 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 2.5) internal successors, (25), 9 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 11 [2023-12-02 12:29:38,283 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 12:29:38,284 INFO L225 Difference]: With dead ends: 219 [2023-12-02 12:29:38,284 INFO L226 Difference]: Without dead ends: 219 [2023-12-02 12:29:38,285 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 19 SyntacticMatches, 1 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 152 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=178, Invalid=472, Unknown=0, NotChecked=0, Total=650 [2023-12-02 12:29:38,285 INFO L413 NwaCegarLoop]: 105 mSDtfsCounter, 259 mSDsluCounter, 439 mSDsCounter, 0 mSdLazyCounter, 267 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 259 SdHoareTripleChecker+Valid, 544 SdHoareTripleChecker+Invalid, 273 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 267 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-12-02 12:29:38,286 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [259 Valid, 544 Invalid, 273 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 267 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-12-02 12:29:38,287 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 219 states. [2023-12-02 12:29:38,290 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 219 to 152. [2023-12-02 12:29:38,290 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 152 states, 114 states have (on average 1.7982456140350878) internal successors, (205), 151 states have internal predecessors, (205), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 12:29:38,291 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 152 states to 152 states and 205 transitions. [2023-12-02 12:29:38,291 INFO L78 Accepts]: Start accepts. Automaton has 152 states and 205 transitions. Word has length 11 [2023-12-02 12:29:38,291 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 12:29:38,291 INFO L495 AbstractCegarLoop]: Abstraction has 152 states and 205 transitions. [2023-12-02 12:29:38,292 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 2.5) internal successors, (25), 9 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 12:29:38,292 INFO L276 IsEmpty]: Start isEmpty. Operand 152 states and 205 transitions. [2023-12-02 12:29:38,292 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2023-12-02 12:29:38,293 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 12:29:38,293 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 1, 1, 1] [2023-12-02 12:29:38,297 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0bfdaf3-5b1c-4197-b2a8-f0c22aad57c8/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Ended with exit code 0 [2023-12-02 12:29:38,493 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0bfdaf3-5b1c-4197-b2a8-f0c22aad57c8/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2023-12-02 12:29:38,494 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr19REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 39 more)] === [2023-12-02 12:29:38,494 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 12:29:38,494 INFO L85 PathProgramCache]: Analyzing trace with hash -234747659, now seen corresponding path program 2 times [2023-12-02 12:29:38,494 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 12:29:38,494 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1817918128] [2023-12-02 12:29:38,494 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 12:29:38,494 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 12:29:38,504 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 12:29:38,539 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2023-12-02 12:29:38,540 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 12:29:38,540 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1817918128] [2023-12-02 12:29:38,540 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1817918128] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 12:29:38,540 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 12:29:38,540 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-12-02 12:29:38,540 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2139774306] [2023-12-02 12:29:38,541 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 12:29:38,541 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 12:29:38,541 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 12:29:38,542 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 12:29:38,542 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-12-02 12:29:38,542 INFO L87 Difference]: Start difference. First operand 152 states and 205 transitions. Second operand has 3 states, 2 states have (on average 3.5) internal successors, (7), 2 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 12:29:38,598 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 12:29:38,598 INFO L93 Difference]: Finished difference Result 150 states and 203 transitions. [2023-12-02 12:29:38,599 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 12:29:38,599 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 3.5) internal successors, (7), 2 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 15 [2023-12-02 12:29:38,599 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 12:29:38,600 INFO L225 Difference]: With dead ends: 150 [2023-12-02 12:29:38,600 INFO L226 Difference]: Without dead ends: 150 [2023-12-02 12:29:38,600 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-12-02 12:29:38,601 INFO L413 NwaCegarLoop]: 54 mSDtfsCounter, 87 mSDsluCounter, 1 mSDsCounter, 0 mSdLazyCounter, 44 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 87 SdHoareTripleChecker+Valid, 55 SdHoareTripleChecker+Invalid, 47 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 44 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 12:29:38,602 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [87 Valid, 55 Invalid, 47 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 44 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 12:29:38,602 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 150 states. [2023-12-02 12:29:38,605 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 150 to 150. [2023-12-02 12:29:38,605 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 150 states, 114 states have (on average 1.780701754385965) internal successors, (203), 149 states have internal predecessors, (203), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 12:29:38,606 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 150 states to 150 states and 203 transitions. [2023-12-02 12:29:38,606 INFO L78 Accepts]: Start accepts. Automaton has 150 states and 203 transitions. Word has length 15 [2023-12-02 12:29:38,606 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 12:29:38,606 INFO L495 AbstractCegarLoop]: Abstraction has 150 states and 203 transitions. [2023-12-02 12:29:38,606 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 3.5) internal successors, (7), 2 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 12:29:38,607 INFO L276 IsEmpty]: Start isEmpty. Operand 150 states and 203 transitions. [2023-12-02 12:29:38,607 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2023-12-02 12:29:38,607 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 12:29:38,608 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 12:29:38,608 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2023-12-02 12:29:38,608 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 39 more)] === [2023-12-02 12:29:38,608 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 12:29:38,608 INFO L85 PathProgramCache]: Analyzing trace with hash -1512753252, now seen corresponding path program 2 times [2023-12-02 12:29:38,609 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 12:29:38,609 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [29718293] [2023-12-02 12:29:38,609 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 12:29:38,609 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 12:29:38,629 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 12:29:38,782 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-12-02 12:29:38,783 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 12:29:38,783 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [29718293] [2023-12-02 12:29:38,783 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [29718293] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 12:29:38,783 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [462582295] [2023-12-02 12:29:38,783 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-12-02 12:29:38,783 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 12:29:38,784 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0bfdaf3-5b1c-4197-b2a8-f0c22aad57c8/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 12:29:38,784 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0bfdaf3-5b1c-4197-b2a8-f0c22aad57c8/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 12:29:38,789 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0bfdaf3-5b1c-4197-b2a8-f0c22aad57c8/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-12-02 12:29:38,891 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2023-12-02 12:29:38,891 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 12:29:38,892 INFO L262 TraceCheckSpWp]: Trace formula consists of 201 conjuncts, 13 conjunts are in the unsatisfiable core [2023-12-02 12:29:38,895 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 12:29:38,918 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2023-12-02 12:29:38,948 INFO L349 Elim1Store]: treesize reduction 20, result has 33.3 percent of original size [2023-12-02 12:29:38,948 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 19 treesize of output 16 [2023-12-02 12:29:38,968 INFO L349 Elim1Store]: treesize reduction 13, result has 40.9 percent of original size [2023-12-02 12:29:38,968 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 14 treesize of output 13 [2023-12-02 12:29:38,999 INFO L349 Elim1Store]: treesize reduction 13, result has 40.9 percent of original size [2023-12-02 12:29:38,999 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 14 treesize of output 13 [2023-12-02 12:29:39,019 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2023-12-02 12:29:39,019 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 12:29:39,094 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 3 proven. 4 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2023-12-02 12:29:39,094 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [462582295] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 12:29:39,095 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [531098733] [2023-12-02 12:29:39,097 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2023-12-02 12:29:39,097 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 12:29:39,097 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 12:29:39,098 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 12:29:39,098 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 12:29:40,081 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 12:29:40,792 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2625#(and (= 3 |ULTIMATE.start_node_create_with_sublist_#in~sublist_length#1|) (<= 1 |#StackHeapBarrier|) (= 3 |ULTIMATE.start_sll_append_#in~sublist_length#1|) (not (= (select |#valid| |ULTIMATE.start_node_create_with_sublist_~new_node~0#1.base|) 1)) (= |ULTIMATE.start_sll_append_~sublist_length#1| 3) (= 3 |ULTIMATE.start_main_~i~0#1|) (= 5 |ULTIMATE.start_main_~max~0#1|) (<= 2 |ULTIMATE.start_sll_append_#in~head#1.base|) (= |ULTIMATE.start_node_create_with_sublist_#t~ret6#1.base| |ULTIMATE.start_sll_create_#res#1.base|) (= |ULTIMATE.start_main_~#head~1#1.offset| 0) (= |ULTIMATE.start_sll_append_~head#1.offset| 0) (= |ULTIMATE.start_sll_create_#res#1.offset| 0) (= |ULTIMATE.start_node_create_with_sublist_~sublist_length#1| 3) (= |ULTIMATE.start_node_create_with_sublist_~new_node~0#1.offset| 0) (= 3 |ULTIMATE.start_main_~min~0#1|) (<= 2 |ULTIMATE.start_sll_append_~head#1.base|) (<= 2 |ULTIMATE.start_main_~#head~1#1.base|) (= |ULTIMATE.start_main_~j~0#1| 0) (= |ULTIMATE.start_sll_append_#in~head#1.offset| 0) (= 0 |ULTIMATE.start_node_create_with_sublist_#t~ret6#1.offset|))' at error location [2023-12-02 12:29:40,792 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 12:29:40,792 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 12:29:40,792 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 3, 4] total 6 [2023-12-02 12:29:40,792 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [743697167] [2023-12-02 12:29:40,792 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 12:29:40,793 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-12-02 12:29:40,793 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 12:29:40,793 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-12-02 12:29:40,793 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=166, Unknown=0, NotChecked=0, Total=210 [2023-12-02 12:29:40,793 INFO L87 Difference]: Start difference. First operand 150 states and 203 transitions. Second operand has 7 states, 6 states have (on average 4.0) internal successors, (24), 7 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 12:29:40,881 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 12:29:40,881 INFO L93 Difference]: Finished difference Result 148 states and 197 transitions. [2023-12-02 12:29:40,881 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-12-02 12:29:40,882 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 4.0) internal successors, (24), 7 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 17 [2023-12-02 12:29:40,882 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 12:29:40,883 INFO L225 Difference]: With dead ends: 148 [2023-12-02 12:29:40,883 INFO L226 Difference]: Without dead ends: 148 [2023-12-02 12:29:40,883 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 41 SyntacticMatches, 3 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 60 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=44, Invalid=166, Unknown=0, NotChecked=0, Total=210 [2023-12-02 12:29:40,884 INFO L413 NwaCegarLoop]: 67 mSDtfsCounter, 9 mSDsluCounter, 88 mSDsCounter, 0 mSdLazyCounter, 118 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 9 SdHoareTripleChecker+Valid, 155 SdHoareTripleChecker+Invalid, 119 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 118 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 12:29:40,884 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [9 Valid, 155 Invalid, 119 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 118 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 12:29:40,885 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 148 states. [2023-12-02 12:29:40,887 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 148 to 148. [2023-12-02 12:29:40,887 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 148 states, 114 states have (on average 1.7280701754385965) internal successors, (197), 147 states have internal predecessors, (197), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 12:29:40,888 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 148 states to 148 states and 197 transitions. [2023-12-02 12:29:40,888 INFO L78 Accepts]: Start accepts. Automaton has 148 states and 197 transitions. Word has length 17 [2023-12-02 12:29:40,888 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 12:29:40,889 INFO L495 AbstractCegarLoop]: Abstraction has 148 states and 197 transitions. [2023-12-02 12:29:40,889 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 6 states have (on average 4.0) internal successors, (24), 7 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 12:29:40,889 INFO L276 IsEmpty]: Start isEmpty. Operand 148 states and 197 transitions. [2023-12-02 12:29:40,890 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2023-12-02 12:29:40,890 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 12:29:40,890 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 12:29:40,895 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0bfdaf3-5b1c-4197-b2a8-f0c22aad57c8/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Ended with exit code 0 [2023-12-02 12:29:41,095 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0bfdaf3-5b1c-4197-b2a8-f0c22aad57c8/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable8 [2023-12-02 12:29:41,095 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 39 more)] === [2023-12-02 12:29:41,096 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 12:29:41,096 INFO L85 PathProgramCache]: Analyzing trace with hash -1512753251, now seen corresponding path program 1 times [2023-12-02 12:29:41,096 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 12:29:41,096 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1819653021] [2023-12-02 12:29:41,096 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 12:29:41,096 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 12:29:41,117 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 12:29:41,357 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2023-12-02 12:29:41,357 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 12:29:41,357 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1819653021] [2023-12-02 12:29:41,357 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1819653021] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 12:29:41,358 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [401468199] [2023-12-02 12:29:41,358 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 12:29:41,358 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 12:29:41,358 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0bfdaf3-5b1c-4197-b2a8-f0c22aad57c8/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 12:29:41,359 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0bfdaf3-5b1c-4197-b2a8-f0c22aad57c8/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 12:29:41,362 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0bfdaf3-5b1c-4197-b2a8-f0c22aad57c8/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-12-02 12:29:41,455 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 12:29:41,457 INFO L262 TraceCheckSpWp]: Trace formula consists of 201 conjuncts, 19 conjunts are in the unsatisfiable core [2023-12-02 12:29:41,459 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 12:29:41,469 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2023-12-02 12:29:41,474 INFO L378 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 [2023-12-02 12:29:41,492 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-12-02 12:29:41,492 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 9 [2023-12-02 12:29:41,509 INFO L349 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2023-12-02 12:29:41,509 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 17 treesize of output 21 [2023-12-02 12:29:41,557 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-12-02 12:29:41,558 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 9 [2023-12-02 12:29:41,571 INFO L349 Elim1Store]: treesize reduction 8, result has 52.9 percent of original size [2023-12-02 12:29:41,571 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 16 treesize of output 18 [2023-12-02 12:29:41,590 INFO L349 Elim1Store]: treesize reduction 13, result has 40.9 percent of original size [2023-12-02 12:29:41,591 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 14 treesize of output 13 [2023-12-02 12:29:41,620 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 1 proven. 8 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2023-12-02 12:29:41,620 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 12:29:41,987 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 1 proven. 11 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 12:29:41,987 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [401468199] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 12:29:41,987 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1322717783] [2023-12-02 12:29:41,989 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2023-12-02 12:29:41,990 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 12:29:41,990 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 12:29:41,990 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 12:29:41,990 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 12:29:42,747 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 12:29:43,441 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3036#(and (= 3 |ULTIMATE.start_node_create_with_sublist_#in~sublist_length#1|) (<= 1 |#StackHeapBarrier|) (= 3 |ULTIMATE.start_sll_append_#in~sublist_length#1|) (= |ULTIMATE.start_sll_append_~sublist_length#1| 3) (= 3 |ULTIMATE.start_main_~i~0#1|) (= 5 |ULTIMATE.start_main_~max~0#1|) (<= 2 |ULTIMATE.start_sll_append_#in~head#1.base|) (= |ULTIMATE.start_node_create_with_sublist_#t~ret6#1.base| |ULTIMATE.start_sll_create_#res#1.base|) (= |ULTIMATE.start_main_~#head~1#1.offset| 0) (= |ULTIMATE.start_sll_append_~head#1.offset| 0) (= |ULTIMATE.start_sll_create_#res#1.offset| 0) (= |ULTIMATE.start_node_create_with_sublist_~sublist_length#1| 3) (= |ULTIMATE.start_node_create_with_sublist_~new_node~0#1.offset| 0) (= 3 |ULTIMATE.start_main_~min~0#1|) (<= 2 |ULTIMATE.start_sll_append_~head#1.base|) (<= 2 |ULTIMATE.start_main_~#head~1#1.base|) (= |ULTIMATE.start_main_~j~0#1| 0) (<= (select |#length| |ULTIMATE.start_node_create_with_sublist_~new_node~0#1.base|) 7) (= |ULTIMATE.start_sll_append_#in~head#1.offset| 0) (= 0 |ULTIMATE.start_node_create_with_sublist_#t~ret6#1.offset|))' at error location [2023-12-02 12:29:43,441 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 12:29:43,441 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 12:29:43,442 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 4, 5] total 10 [2023-12-02 12:29:43,442 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2010607548] [2023-12-02 12:29:43,442 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 12:29:43,442 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2023-12-02 12:29:43,442 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 12:29:43,442 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2023-12-02 12:29:43,443 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=70, Invalid=272, Unknown=0, NotChecked=0, Total=342 [2023-12-02 12:29:43,443 INFO L87 Difference]: Start difference. First operand 148 states and 197 transitions. Second operand has 11 states, 10 states have (on average 3.5) internal successors, (35), 11 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 12:29:43,695 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 12:29:43,695 INFO L93 Difference]: Finished difference Result 146 states and 191 transitions. [2023-12-02 12:29:43,696 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-12-02 12:29:43,696 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 10 states have (on average 3.5) internal successors, (35), 11 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 17 [2023-12-02 12:29:43,696 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 12:29:43,697 INFO L225 Difference]: With dead ends: 146 [2023-12-02 12:29:43,697 INFO L226 Difference]: Without dead ends: 146 [2023-12-02 12:29:43,697 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 59 GetRequests, 39 SyntacticMatches, 1 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 122 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=92, Invalid=328, Unknown=0, NotChecked=0, Total=420 [2023-12-02 12:29:43,698 INFO L413 NwaCegarLoop]: 67 mSDtfsCounter, 5 mSDsluCounter, 163 mSDsCounter, 0 mSdLazyCounter, 217 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 230 SdHoareTripleChecker+Invalid, 219 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 217 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-12-02 12:29:43,698 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [5 Valid, 230 Invalid, 219 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 217 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-12-02 12:29:43,698 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 146 states. [2023-12-02 12:29:43,700 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 146 to 146. [2023-12-02 12:29:43,700 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 146 states, 114 states have (on average 1.6754385964912282) internal successors, (191), 145 states have internal predecessors, (191), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 12:29:43,701 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 146 states to 146 states and 191 transitions. [2023-12-02 12:29:43,701 INFO L78 Accepts]: Start accepts. Automaton has 146 states and 191 transitions. Word has length 17 [2023-12-02 12:29:43,702 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 12:29:43,702 INFO L495 AbstractCegarLoop]: Abstraction has 146 states and 191 transitions. [2023-12-02 12:29:43,702 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 10 states have (on average 3.5) internal successors, (35), 11 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 12:29:43,702 INFO L276 IsEmpty]: Start isEmpty. Operand 146 states and 191 transitions. [2023-12-02 12:29:43,703 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2023-12-02 12:29:43,703 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 12:29:43,703 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 12:29:43,708 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0bfdaf3-5b1c-4197-b2a8-f0c22aad57c8/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Ended with exit code 0 [2023-12-02 12:29:43,903 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0bfdaf3-5b1c-4197-b2a8-f0c22aad57c8/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2023-12-02 12:29:43,904 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr20REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 39 more)] === [2023-12-02 12:29:43,904 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 12:29:43,904 INFO L85 PathProgramCache]: Analyzing trace with hash -1471660772, now seen corresponding path program 1 times [2023-12-02 12:29:43,904 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 12:29:43,904 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1521181909] [2023-12-02 12:29:43,904 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 12:29:43,905 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 12:29:43,911 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 12:29:43,951 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2023-12-02 12:29:43,951 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 12:29:43,951 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1521181909] [2023-12-02 12:29:43,951 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1521181909] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 12:29:43,951 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 12:29:43,952 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-12-02 12:29:43,952 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1024283378] [2023-12-02 12:29:43,952 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 12:29:43,952 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-12-02 12:29:43,952 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 12:29:43,953 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-12-02 12:29:43,953 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-12-02 12:29:43,953 INFO L87 Difference]: Start difference. First operand 146 states and 191 transitions. Second operand has 4 states, 4 states have (on average 2.75) internal successors, (11), 3 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 12:29:44,035 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 12:29:44,035 INFO L93 Difference]: Finished difference Result 201 states and 252 transitions. [2023-12-02 12:29:44,035 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-12-02 12:29:44,035 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.75) internal successors, (11), 3 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 19 [2023-12-02 12:29:44,035 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 12:29:44,036 INFO L225 Difference]: With dead ends: 201 [2023-12-02 12:29:44,037 INFO L226 Difference]: Without dead ends: 201 [2023-12-02 12:29:44,037 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2023-12-02 12:29:44,037 INFO L413 NwaCegarLoop]: 69 mSDtfsCounter, 87 mSDsluCounter, 107 mSDsCounter, 0 mSdLazyCounter, 74 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 87 SdHoareTripleChecker+Valid, 176 SdHoareTripleChecker+Invalid, 76 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 74 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 12:29:44,038 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [87 Valid, 176 Invalid, 76 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 74 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 12:29:44,039 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 201 states. [2023-12-02 12:29:44,041 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 201 to 161. [2023-12-02 12:29:44,042 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 161 states, 129 states have (on average 1.627906976744186) internal successors, (210), 160 states have internal predecessors, (210), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 12:29:44,043 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 161 states to 161 states and 210 transitions. [2023-12-02 12:29:44,043 INFO L78 Accepts]: Start accepts. Automaton has 161 states and 210 transitions. Word has length 19 [2023-12-02 12:29:44,043 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 12:29:44,043 INFO L495 AbstractCegarLoop]: Abstraction has 161 states and 210 transitions. [2023-12-02 12:29:44,047 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 2.75) internal successors, (11), 3 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 12:29:44,048 INFO L276 IsEmpty]: Start isEmpty. Operand 161 states and 210 transitions. [2023-12-02 12:29:44,048 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2023-12-02 12:29:44,049 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 12:29:44,049 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 12:29:44,049 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2023-12-02 12:29:44,049 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr28REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 39 more)] === [2023-12-02 12:29:44,050 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 12:29:44,050 INFO L85 PathProgramCache]: Analyzing trace with hash -1466628850, now seen corresponding path program 1 times [2023-12-02 12:29:44,050 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 12:29:44,050 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [339051388] [2023-12-02 12:29:44,050 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 12:29:44,050 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 12:29:44,059 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 12:29:44,126 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2023-12-02 12:29:44,126 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 12:29:44,126 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [339051388] [2023-12-02 12:29:44,126 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [339051388] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 12:29:44,127 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 12:29:44,127 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-12-02 12:29:44,127 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1902729591] [2023-12-02 12:29:44,127 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 12:29:44,127 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-12-02 12:29:44,128 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 12:29:44,128 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-12-02 12:29:44,128 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-12-02 12:29:44,128 INFO L87 Difference]: Start difference. First operand 161 states and 210 transitions. Second operand has 4 states, 4 states have (on average 2.75) internal successors, (11), 3 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 12:29:44,203 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 12:29:44,203 INFO L93 Difference]: Finished difference Result 179 states and 228 transitions. [2023-12-02 12:29:44,204 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-12-02 12:29:44,204 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.75) internal successors, (11), 3 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 19 [2023-12-02 12:29:44,204 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 12:29:44,205 INFO L225 Difference]: With dead ends: 179 [2023-12-02 12:29:44,205 INFO L226 Difference]: Without dead ends: 179 [2023-12-02 12:29:44,205 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2023-12-02 12:29:44,206 INFO L413 NwaCegarLoop]: 69 mSDtfsCounter, 6 mSDsluCounter, 123 mSDsCounter, 0 mSdLazyCounter, 86 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 192 SdHoareTripleChecker+Invalid, 86 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 86 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 12:29:44,206 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [6 Valid, 192 Invalid, 86 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 86 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 12:29:44,207 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 179 states. [2023-12-02 12:29:44,209 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 179 to 164. [2023-12-02 12:29:44,210 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 164 states, 132 states have (on average 1.6136363636363635) internal successors, (213), 163 states have internal predecessors, (213), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 12:29:44,211 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 164 states to 164 states and 213 transitions. [2023-12-02 12:29:44,211 INFO L78 Accepts]: Start accepts. Automaton has 164 states and 213 transitions. Word has length 19 [2023-12-02 12:29:44,211 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 12:29:44,211 INFO L495 AbstractCegarLoop]: Abstraction has 164 states and 213 transitions. [2023-12-02 12:29:44,212 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 2.75) internal successors, (11), 3 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 12:29:44,212 INFO L276 IsEmpty]: Start isEmpty. Operand 164 states and 213 transitions. [2023-12-02 12:29:44,213 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2023-12-02 12:29:44,213 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 12:29:44,213 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 12:29:44,213 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2023-12-02 12:29:44,213 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr41ASSERT_VIOLATIONMEMORY_LEAK === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 39 more)] === [2023-12-02 12:29:44,214 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 12:29:44,214 INFO L85 PathProgramCache]: Analyzing trace with hash -1466626257, now seen corresponding path program 1 times [2023-12-02 12:29:44,214 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 12:29:44,214 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2054232639] [2023-12-02 12:29:44,214 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 12:29:44,215 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 12:29:44,226 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 12:29:44,271 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2023-12-02 12:29:44,272 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 12:29:44,272 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2054232639] [2023-12-02 12:29:44,272 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2054232639] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 12:29:44,272 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 12:29:44,272 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-12-02 12:29:44,272 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1474068812] [2023-12-02 12:29:44,272 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 12:29:44,273 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-12-02 12:29:44,273 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 12:29:44,273 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-12-02 12:29:44,274 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-12-02 12:29:44,274 INFO L87 Difference]: Start difference. First operand 164 states and 213 transitions. Second operand has 4 states, 3 states have (on average 3.6666666666666665) internal successors, (11), 3 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 12:29:44,360 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 12:29:44,360 INFO L93 Difference]: Finished difference Result 165 states and 213 transitions. [2023-12-02 12:29:44,361 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-12-02 12:29:44,361 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 3.6666666666666665) internal successors, (11), 3 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 19 [2023-12-02 12:29:44,361 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 12:29:44,362 INFO L225 Difference]: With dead ends: 165 [2023-12-02 12:29:44,362 INFO L226 Difference]: Without dead ends: 160 [2023-12-02 12:29:44,362 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-12-02 12:29:44,362 INFO L413 NwaCegarLoop]: 69 mSDtfsCounter, 0 mSDsluCounter, 94 mSDsCounter, 0 mSdLazyCounter, 115 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 163 SdHoareTripleChecker+Invalid, 115 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 115 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 12:29:44,363 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 163 Invalid, 115 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 115 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 12:29:44,363 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 160 states. [2023-12-02 12:29:44,365 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 160 to 158. [2023-12-02 12:29:44,366 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 158 states, 126 states have (on average 1.6349206349206349) internal successors, (206), 157 states have internal predecessors, (206), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 12:29:44,367 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 158 states to 158 states and 206 transitions. [2023-12-02 12:29:44,367 INFO L78 Accepts]: Start accepts. Automaton has 158 states and 206 transitions. Word has length 19 [2023-12-02 12:29:44,367 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 12:29:44,367 INFO L495 AbstractCegarLoop]: Abstraction has 158 states and 206 transitions. [2023-12-02 12:29:44,367 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 3.6666666666666665) internal successors, (11), 3 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 12:29:44,367 INFO L276 IsEmpty]: Start isEmpty. Operand 158 states and 206 transitions. [2023-12-02 12:29:44,368 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2023-12-02 12:29:44,368 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 12:29:44,368 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 12:29:44,368 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2023-12-02 12:29:44,368 INFO L420 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr6REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 39 more)] === [2023-12-02 12:29:44,369 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 12:29:44,369 INFO L85 PathProgramCache]: Analyzing trace with hash -2056707677, now seen corresponding path program 1 times [2023-12-02 12:29:44,369 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 12:29:44,369 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [323306729] [2023-12-02 12:29:44,369 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 12:29:44,369 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 12:29:44,385 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 12:29:44,432 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2023-12-02 12:29:44,432 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 12:29:44,433 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [323306729] [2023-12-02 12:29:44,433 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [323306729] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 12:29:44,433 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 12:29:44,433 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-12-02 12:29:44,433 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1659340118] [2023-12-02 12:29:44,433 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 12:29:44,434 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-12-02 12:29:44,434 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 12:29:44,434 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-12-02 12:29:44,434 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-12-02 12:29:44,435 INFO L87 Difference]: Start difference. First operand 158 states and 206 transitions. Second operand has 4 states, 3 states have (on average 4.333333333333333) internal successors, (13), 4 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) [2023-12-02 12:29:44,513 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 12:29:44,513 INFO L93 Difference]: Finished difference Result 157 states and 203 transitions. [2023-12-02 12:29:44,513 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-12-02 12:29:44,513 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 4.333333333333333) internal successors, (13), 4 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 19 [2023-12-02 12:29:44,513 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 12:29:44,514 INFO L225 Difference]: With dead ends: 157 [2023-12-02 12:29:44,514 INFO L226 Difference]: Without dead ends: 157 [2023-12-02 12:29:44,515 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-12-02 12:29:44,515 INFO L413 NwaCegarLoop]: 57 mSDtfsCounter, 26 mSDsluCounter, 79 mSDsCounter, 0 mSdLazyCounter, 110 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 26 SdHoareTripleChecker+Valid, 136 SdHoareTripleChecker+Invalid, 112 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 110 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 12:29:44,516 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [26 Valid, 136 Invalid, 112 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 110 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 12:29:44,516 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 157 states. [2023-12-02 12:29:44,518 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 157 to 157. [2023-12-02 12:29:44,519 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 157 states, 126 states have (on average 1.6111111111111112) internal successors, (203), 156 states have internal predecessors, (203), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 12:29:44,519 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 157 states to 157 states and 203 transitions. [2023-12-02 12:29:44,520 INFO L78 Accepts]: Start accepts. Automaton has 157 states and 203 transitions. Word has length 19 [2023-12-02 12:29:44,520 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 12:29:44,520 INFO L495 AbstractCegarLoop]: Abstraction has 157 states and 203 transitions. [2023-12-02 12:29:44,520 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 4.333333333333333) internal successors, (13), 4 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) [2023-12-02 12:29:44,520 INFO L276 IsEmpty]: Start isEmpty. Operand 157 states and 203 transitions. [2023-12-02 12:29:44,520 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2023-12-02 12:29:44,521 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 12:29:44,521 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 12:29:44,521 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2023-12-02 12:29:44,521 INFO L420 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr7REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 39 more)] === [2023-12-02 12:29:44,521 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 12:29:44,521 INFO L85 PathProgramCache]: Analyzing trace with hash -2056707676, now seen corresponding path program 1 times [2023-12-02 12:29:44,522 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 12:29:44,522 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [656214943] [2023-12-02 12:29:44,522 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 12:29:44,522 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 12:29:44,540 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 12:29:44,621 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2023-12-02 12:29:44,621 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 12:29:44,621 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [656214943] [2023-12-02 12:29:44,622 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [656214943] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 12:29:44,622 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 12:29:44,622 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-12-02 12:29:44,622 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1907947023] [2023-12-02 12:29:44,622 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 12:29:44,622 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-12-02 12:29:44,622 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 12:29:44,623 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-12-02 12:29:44,623 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2023-12-02 12:29:44,623 INFO L87 Difference]: Start difference. First operand 157 states and 203 transitions. Second operand has 5 states, 4 states have (on average 3.25) internal successors, (13), 5 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 12:29:44,711 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 12:29:44,711 INFO L93 Difference]: Finished difference Result 156 states and 200 transitions. [2023-12-02 12:29:44,711 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-12-02 12:29:44,712 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 3.25) internal successors, (13), 5 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 19 [2023-12-02 12:29:44,712 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 12:29:44,713 INFO L225 Difference]: With dead ends: 156 [2023-12-02 12:29:44,713 INFO L226 Difference]: Without dead ends: 156 [2023-12-02 12:29:44,713 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2023-12-02 12:29:44,713 INFO L413 NwaCegarLoop]: 57 mSDtfsCounter, 25 mSDsluCounter, 143 mSDsCounter, 0 mSdLazyCounter, 127 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 25 SdHoareTripleChecker+Valid, 200 SdHoareTripleChecker+Invalid, 129 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 127 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 12:29:44,714 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [25 Valid, 200 Invalid, 129 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 127 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 12:29:44,715 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 156 states. [2023-12-02 12:29:44,717 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 156 to 156. [2023-12-02 12:29:44,717 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 156 states, 126 states have (on average 1.5873015873015872) internal successors, (200), 155 states have internal predecessors, (200), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 12:29:44,717 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 156 states to 156 states and 200 transitions. [2023-12-02 12:29:44,718 INFO L78 Accepts]: Start accepts. Automaton has 156 states and 200 transitions. Word has length 19 [2023-12-02 12:29:44,718 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 12:29:44,718 INFO L495 AbstractCegarLoop]: Abstraction has 156 states and 200 transitions. [2023-12-02 12:29:44,718 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 3.25) internal successors, (13), 5 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 12:29:44,718 INFO L276 IsEmpty]: Start isEmpty. Operand 156 states and 200 transitions. [2023-12-02 12:29:44,719 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2023-12-02 12:29:44,719 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 12:29:44,719 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 12:29:44,719 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2023-12-02 12:29:44,719 INFO L420 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 39 more)] === [2023-12-02 12:29:44,720 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 12:29:44,720 INFO L85 PathProgramCache]: Analyzing trace with hash 666571502, now seen corresponding path program 1 times [2023-12-02 12:29:44,720 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 12:29:44,720 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [931734567] [2023-12-02 12:29:44,720 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 12:29:44,721 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 12:29:44,747 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 12:29:44,996 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2023-12-02 12:29:44,996 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 12:29:44,996 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [931734567] [2023-12-02 12:29:44,997 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [931734567] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 12:29:44,997 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1371074857] [2023-12-02 12:29:44,997 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 12:29:44,997 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 12:29:44,997 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0bfdaf3-5b1c-4197-b2a8-f0c22aad57c8/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 12:29:44,998 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0bfdaf3-5b1c-4197-b2a8-f0c22aad57c8/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 12:29:45,000 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0bfdaf3-5b1c-4197-b2a8-f0c22aad57c8/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-12-02 12:29:45,114 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 12:29:45,116 INFO L262 TraceCheckSpWp]: Trace formula consists of 257 conjuncts, 22 conjunts are in the unsatisfiable core [2023-12-02 12:29:45,118 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 12:29:45,126 INFO L378 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 [2023-12-02 12:29:45,160 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-12-02 12:29:45,161 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 9 [2023-12-02 12:29:45,194 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-12-02 12:29:45,195 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 9 [2023-12-02 12:29:45,216 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-12-02 12:29:45,217 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 9 [2023-12-02 12:29:45,242 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-12-02 12:29:45,243 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 9 [2023-12-02 12:29:45,276 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2023-12-02 12:29:45,276 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 12:29:47,417 WARN L854 $PredicateComparison]: unable to prove that (and (<= 0 |c_ULTIMATE.start_sll_append_~head#1.offset|) (forall ((|v_ULTIMATE.start_sll_create_~new_head~0#1.base_46| Int)) (or (forall ((v_ArrVal_355 Int) (|v_ULTIMATE.start_sll_create_~new_head~0#1.base_45| Int)) (or (< |c_#StackHeapBarrier| (+ |v_ULTIMATE.start_sll_create_~new_head~0#1.base_45| 1)) (forall ((v_ArrVal_356 Int)) (<= (+ |c_ULTIMATE.start_sll_append_~head#1.offset| 4) (select (store (store |c_#length| |v_ULTIMATE.start_sll_create_~new_head~0#1.base_46| v_ArrVal_355) |v_ULTIMATE.start_sll_create_~new_head~0#1.base_45| v_ArrVal_356) |c_ULTIMATE.start_sll_append_~head#1.base|))))) (< |c_#StackHeapBarrier| (+ |v_ULTIMATE.start_sll_create_~new_head~0#1.base_46| 1))))) is different from false [2023-12-02 12:29:49,486 WARN L854 $PredicateComparison]: unable to prove that (and (<= 0 |c_ULTIMATE.start_sll_append_~head#1.offset|) (forall ((|v_ULTIMATE.start_sll_create_~new_head~0#1.base_47| Int)) (or (forall ((v_ArrVal_354 Int) (|v_ULTIMATE.start_sll_create_~new_head~0#1.base_46| Int)) (or (< |c_#StackHeapBarrier| (+ |v_ULTIMATE.start_sll_create_~new_head~0#1.base_46| 1)) (forall ((v_ArrVal_355 Int) (|v_ULTIMATE.start_sll_create_~new_head~0#1.base_45| Int)) (or (< |c_#StackHeapBarrier| (+ |v_ULTIMATE.start_sll_create_~new_head~0#1.base_45| 1)) (forall ((v_ArrVal_356 Int)) (<= (+ |c_ULTIMATE.start_sll_append_~head#1.offset| 4) (select (store (store (store |c_#length| |v_ULTIMATE.start_sll_create_~new_head~0#1.base_47| v_ArrVal_354) |v_ULTIMATE.start_sll_create_~new_head~0#1.base_46| v_ArrVal_355) |v_ULTIMATE.start_sll_create_~new_head~0#1.base_45| v_ArrVal_356) |c_ULTIMATE.start_sll_append_~head#1.base|))))))) (< |c_#StackHeapBarrier| (+ |v_ULTIMATE.start_sll_create_~new_head~0#1.base_47| 1))))) is different from false [2023-12-02 12:29:51,586 WARN L854 $PredicateComparison]: unable to prove that (and (<= 0 |c_ULTIMATE.start_main_~#head~1#1.offset|) (forall ((|v_ULTIMATE.start_node_create_with_sublist_~new_node~0#1.base_26| Int)) (or (< |c_#StackHeapBarrier| (+ |v_ULTIMATE.start_node_create_with_sublist_~new_node~0#1.base_26| 1)) (forall ((v_ArrVal_353 Int) (|v_ULTIMATE.start_sll_create_~new_head~0#1.base_47| Int)) (or (forall ((v_ArrVal_354 Int) (|v_ULTIMATE.start_sll_create_~new_head~0#1.base_46| Int)) (or (< |c_#StackHeapBarrier| (+ |v_ULTIMATE.start_sll_create_~new_head~0#1.base_46| 1)) (forall ((v_ArrVal_355 Int) (|v_ULTIMATE.start_sll_create_~new_head~0#1.base_45| Int)) (or (< |c_#StackHeapBarrier| (+ |v_ULTIMATE.start_sll_create_~new_head~0#1.base_45| 1)) (forall ((v_ArrVal_356 Int)) (<= (+ 4 |c_ULTIMATE.start_main_~#head~1#1.offset|) (select (store (store (store (store |c_#length| |v_ULTIMATE.start_node_create_with_sublist_~new_node~0#1.base_26| v_ArrVal_353) |v_ULTIMATE.start_sll_create_~new_head~0#1.base_47| v_ArrVal_354) |v_ULTIMATE.start_sll_create_~new_head~0#1.base_46| v_ArrVal_355) |v_ULTIMATE.start_sll_create_~new_head~0#1.base_45| v_ArrVal_356) |c_ULTIMATE.start_main_~#head~1#1.base|))))))) (< |c_#StackHeapBarrier| (+ |v_ULTIMATE.start_sll_create_~new_head~0#1.base_47| 1))))))) is different from false [2023-12-02 12:29:51,656 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 9 not checked. [2023-12-02 12:29:51,656 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1371074857] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 12:29:51,657 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [291613920] [2023-12-02 12:29:51,659 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2023-12-02 12:29:51,659 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 12:29:51,659 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 12:29:51,659 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 12:29:51,660 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 12:29:52,454 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 12:29:53,638 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '5147#(and (<= 1 |#StackHeapBarrier|) (= (select |#valid| |ULTIMATE.start_sll_append_~new_last~0#1.base|) 1) (= 3 |ULTIMATE.start_sll_append_#in~sublist_length#1|) (exists ((|v_#memory_$Pointer$.offset_84| (Array Int (Array Int Int)))) (= |#memory_$Pointer$.offset| (store (store |v_#memory_$Pointer$.offset_84| |ULTIMATE.start_node_create_with_sublist_#res#1.base| (store (store (select |v_#memory_$Pointer$.offset_84| |ULTIMATE.start_node_create_with_sublist_#res#1.base|) 4 0) 0 0)) |ULTIMATE.start_sll_append_~new_last~0#1.base| (store (select (store |v_#memory_$Pointer$.offset_84| |ULTIMATE.start_node_create_with_sublist_#res#1.base| (store (store (select |v_#memory_$Pointer$.offset_84| |ULTIMATE.start_node_create_with_sublist_#res#1.base|) 4 0) 0 0)) |ULTIMATE.start_sll_append_~new_last~0#1.base|) 0 0)))) (= |ULTIMATE.start_node_create_with_sublist_#res#1.offset| 0) (= |ULTIMATE.start_sll_append_~sublist_length#1| 3) (= 3 |ULTIMATE.start_main_~i~0#1|) (= 5 |ULTIMATE.start_main_~max~0#1|) (<= 2 |ULTIMATE.start_sll_append_#in~head#1.base|) (= |ULTIMATE.start_main_~#head~1#1.offset| 0) (= |ULTIMATE.start_sll_append_~head#1.offset| 0) (exists ((|v_#memory_int_53| (Array Int (Array Int Int))) (|v_#memory_int_54| (Array Int (Array Int Int))) (|v_#memory_int_55| (Array Int (Array Int Int)))) (and (= |#memory_int| (store |v_#memory_int_55| |ULTIMATE.start_sll_append_~new_last~0#1.base| (store (select |v_#memory_int_55| |ULTIMATE.start_sll_append_~new_last~0#1.base|) 0 (select (select |#memory_int| |ULTIMATE.start_sll_append_~new_last~0#1.base|) 0)))) (= |v_#memory_int_55| (store |v_#memory_int_54| |ULTIMATE.start_node_create_with_sublist_#res#1.base| (store (select |v_#memory_int_54| |ULTIMATE.start_node_create_with_sublist_#res#1.base|) 0 (select (select |v_#memory_int_55| |ULTIMATE.start_node_create_with_sublist_#res#1.base|) 0)))) (= (store |v_#memory_int_53| |ULTIMATE.start_node_create_with_sublist_#res#1.base| (store (select |v_#memory_int_53| |ULTIMATE.start_node_create_with_sublist_#res#1.base|) 4 (select (select |v_#memory_int_54| |ULTIMATE.start_node_create_with_sublist_#res#1.base|) 4))) |v_#memory_int_54|))) (= |ULTIMATE.start_sll_create_#res#1.offset| 0) (= 3 |ULTIMATE.start_main_~min~0#1|) (<= 2 |ULTIMATE.start_sll_append_~head#1.base|) (<= 2 |ULTIMATE.start_main_~#head~1#1.base|) (exists ((|v_#memory_$Pointer$.base_84| (Array Int (Array Int Int)))) (= |#memory_$Pointer$.base| (store (store |v_#memory_$Pointer$.base_84| |ULTIMATE.start_node_create_with_sublist_#res#1.base| (store (store (select |v_#memory_$Pointer$.base_84| |ULTIMATE.start_node_create_with_sublist_#res#1.base|) 4 |ULTIMATE.start_sll_create_#res#1.base|) 0 0)) |ULTIMATE.start_sll_append_~new_last~0#1.base| (store (select (store |v_#memory_$Pointer$.base_84| |ULTIMATE.start_node_create_with_sublist_#res#1.base| (store (store (select |v_#memory_$Pointer$.base_84| |ULTIMATE.start_node_create_with_sublist_#res#1.base|) 4 |ULTIMATE.start_sll_create_#res#1.base|) 0 0)) |ULTIMATE.start_sll_append_~new_last~0#1.base|) 0 0)))) (= |ULTIMATE.start_sll_append_~new_last~0#1.offset| 0) (<= (select |#length| |ULTIMATE.start_sll_append_~head#1.base|) 3) (<= 8 (select |#length| |ULTIMATE.start_node_create_with_sublist_#res#1.base|)) (= |ULTIMATE.start_main_~j~0#1| 0) (= |ULTIMATE.start_sll_append_#in~head#1.offset| 0) (= |ULTIMATE.start_node_create_with_sublist_#res#1.base| |ULTIMATE.start_sll_append_~new_last~0#1.base|))' at error location [2023-12-02 12:29:53,638 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 12:29:53,638 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 12:29:53,638 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 3, 5] total 12 [2023-12-02 12:29:53,639 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1161854255] [2023-12-02 12:29:53,639 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 12:29:53,639 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2023-12-02 12:29:53,639 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 12:29:53,640 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2023-12-02 12:29:53,640 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=84, Invalid=345, Unknown=3, NotChecked=120, Total=552 [2023-12-02 12:29:53,640 INFO L87 Difference]: Start difference. First operand 156 states and 200 transitions. Second operand has 14 states, 13 states have (on average 4.230769230769231) internal successors, (55), 13 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) [2023-12-02 12:29:53,876 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 12:29:53,876 INFO L93 Difference]: Finished difference Result 175 states and 213 transitions. [2023-12-02 12:29:53,876 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-12-02 12:29:53,876 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 13 states have (on average 4.230769230769231) internal successors, (55), 13 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 20 [2023-12-02 12:29:53,877 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 12:29:53,877 INFO L225 Difference]: With dead ends: 175 [2023-12-02 12:29:53,877 INFO L226 Difference]: Without dead ends: 175 [2023-12-02 12:29:53,878 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 67 GetRequests, 41 SyntacticMatches, 3 SemanticMatches, 23 ConstructedPredicates, 3 IntricatePredicates, 0 DeprecatedPredicates, 145 ImplicationChecksByTransitivity, 7.4s TimeCoverageRelationStatistics Valid=96, Invalid=375, Unknown=3, NotChecked=126, Total=600 [2023-12-02 12:29:53,878 INFO L413 NwaCegarLoop]: 32 mSDtfsCounter, 159 mSDsluCounter, 110 mSDsCounter, 0 mSdLazyCounter, 224 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 159 SdHoareTripleChecker+Valid, 142 SdHoareTripleChecker+Invalid, 554 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 224 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 324 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 12:29:53,879 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [159 Valid, 142 Invalid, 554 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 224 Invalid, 0 Unknown, 324 Unchecked, 0.1s Time] [2023-12-02 12:29:53,879 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 175 states. [2023-12-02 12:29:53,881 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 175 to 152. [2023-12-02 12:29:53,882 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 152 states, 126 states have (on average 1.492063492063492) internal successors, (188), 151 states have internal predecessors, (188), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 12:29:53,883 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 152 states to 152 states and 188 transitions. [2023-12-02 12:29:53,883 INFO L78 Accepts]: Start accepts. Automaton has 152 states and 188 transitions. Word has length 20 [2023-12-02 12:29:53,883 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 12:29:53,883 INFO L495 AbstractCegarLoop]: Abstraction has 152 states and 188 transitions. [2023-12-02 12:29:53,883 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 13 states have (on average 4.230769230769231) internal successors, (55), 13 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) [2023-12-02 12:29:53,884 INFO L276 IsEmpty]: Start isEmpty. Operand 152 states and 188 transitions. [2023-12-02 12:29:53,884 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2023-12-02 12:29:53,884 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 12:29:53,884 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 12:29:53,890 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0bfdaf3-5b1c-4197-b2a8-f0c22aad57c8/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Ended with exit code 0 [2023-12-02 12:29:54,085 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0bfdaf3-5b1c-4197-b2a8-f0c22aad57c8/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2023-12-02 12:29:54,085 INFO L420 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr10REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 39 more)] === [2023-12-02 12:29:54,085 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 12:29:54,086 INFO L85 PathProgramCache]: Analyzing trace with hash 625286978, now seen corresponding path program 1 times [2023-12-02 12:29:54,086 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 12:29:54,086 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1736854560] [2023-12-02 12:29:54,086 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 12:29:54,086 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 12:29:54,111 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 12:29:54,528 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2023-12-02 12:29:54,528 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 12:29:54,528 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1736854560] [2023-12-02 12:29:54,529 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1736854560] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 12:29:54,529 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1653191685] [2023-12-02 12:29:54,529 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 12:29:54,529 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 12:29:54,529 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0bfdaf3-5b1c-4197-b2a8-f0c22aad57c8/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 12:29:54,530 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0bfdaf3-5b1c-4197-b2a8-f0c22aad57c8/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 12:29:54,532 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0bfdaf3-5b1c-4197-b2a8-f0c22aad57c8/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2023-12-02 12:29:54,656 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 12:29:54,659 INFO L262 TraceCheckSpWp]: Trace formula consists of 266 conjuncts, 53 conjunts are in the unsatisfiable core [2023-12-02 12:29:54,662 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 12:29:54,674 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2023-12-02 12:29:54,723 INFO L349 Elim1Store]: treesize reduction 20, result has 33.3 percent of original size [2023-12-02 12:29:54,724 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 19 treesize of output 16 [2023-12-02 12:29:54,814 INFO L349 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2023-12-02 12:29:54,814 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 11 treesize of output 11 [2023-12-02 12:29:54,883 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 18 [2023-12-02 12:29:54,887 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 11 [2023-12-02 12:29:55,008 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-12-02 12:29:55,020 INFO L349 Elim1Store]: treesize reduction 13, result has 40.9 percent of original size [2023-12-02 12:29:55,020 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 23 treesize of output 25 [2023-12-02 12:29:55,028 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-12-02 12:29:55,029 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 11 [2023-12-02 12:29:55,131 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-12-02 12:29:55,132 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 11 [2023-12-02 12:29:55,136 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-12-02 12:29:55,137 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 11 [2023-12-02 12:29:55,177 INFO L378 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 [2023-12-02 12:29:55,182 INFO L378 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 [2023-12-02 12:29:55,196 INFO L378 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 [2023-12-02 12:29:55,201 INFO L378 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 [2023-12-02 12:29:55,231 INFO L378 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 [2023-12-02 12:29:55,235 INFO L378 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 [2023-12-02 12:29:55,263 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 12:29:55,263 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 12:29:55,344 WARN L854 $PredicateComparison]: unable to prove that (and (forall ((v_ArrVal_463 (Array Int Int))) (= (select (select (store |c_#memory_$Pointer$.offset| |c_ULTIMATE.start_node_create_with_sublist_~new_node~0#1.base| v_ArrVal_463) |c_ULTIMATE.start_sll_append_~head#1.base|) |c_ULTIMATE.start_sll_append_~head#1.offset|) 0)) (forall ((v_ArrVal_462 (Array Int Int))) (= 0 (select (select (store |c_#memory_$Pointer$.base| |c_ULTIMATE.start_node_create_with_sublist_~new_node~0#1.base| v_ArrVal_462) |c_ULTIMATE.start_sll_append_~head#1.base|) |c_ULTIMATE.start_sll_append_~head#1.offset|)))) is different from false [2023-12-02 12:29:57,590 WARN L854 $PredicateComparison]: unable to prove that (and (forall ((|v_ULTIMATE.start_sll_create_~new_head~0#1.base_56| Int) (v_ArrVal_455 (Array Int Int))) (or (forall ((v_ArrVal_457 (Array Int Int)) (v_ArrVal_463 (Array Int Int))) (= (select (select (store (store (store |c_#memory_$Pointer$.offset| |c_ULTIMATE.start_sll_create_~new_head~0#1.base| v_ArrVal_455) |v_ULTIMATE.start_sll_create_~new_head~0#1.base_56| v_ArrVal_457) |c_ULTIMATE.start_node_create_with_sublist_~new_node~0#1.base| v_ArrVal_463) |c_ULTIMATE.start_sll_append_~head#1.base|) |c_ULTIMATE.start_sll_append_~head#1.offset|) 0)) (< |c_#StackHeapBarrier| (+ |v_ULTIMATE.start_sll_create_~new_head~0#1.base_56| 1)))) (forall ((|v_ULTIMATE.start_sll_create_~new_head~0#1.base_56| Int) (v_ArrVal_454 (Array Int Int))) (or (< |c_#StackHeapBarrier| (+ |v_ULTIMATE.start_sll_create_~new_head~0#1.base_56| 1)) (forall ((v_ArrVal_462 (Array Int Int)) (v_ArrVal_456 (Array Int Int))) (= (select (select (store (store (store |c_#memory_$Pointer$.base| |c_ULTIMATE.start_sll_create_~new_head~0#1.base| v_ArrVal_454) |v_ULTIMATE.start_sll_create_~new_head~0#1.base_56| v_ArrVal_456) |c_ULTIMATE.start_node_create_with_sublist_~new_node~0#1.base| v_ArrVal_462) |c_ULTIMATE.start_sll_append_~head#1.base|) |c_ULTIMATE.start_sll_append_~head#1.offset|) 0))))) is different from false [2023-12-02 12:29:59,633 WARN L854 $PredicateComparison]: unable to prove that (and (forall ((|v_ULTIMATE.start_sll_create_~new_head~0#1.base_57| Int)) (or (< |c_#StackHeapBarrier| (+ |v_ULTIMATE.start_sll_create_~new_head~0#1.base_57| 1)) (forall ((|v_ULTIMATE.start_sll_create_~new_head~0#1.base_56| Int) (v_ArrVal_454 (Array Int Int))) (or (< |c_#StackHeapBarrier| (+ |v_ULTIMATE.start_sll_create_~new_head~0#1.base_56| 1)) (forall ((v_ArrVal_462 (Array Int Int)) (v_ArrVal_456 (Array Int Int))) (= (select (select (store (store (store |c_#memory_$Pointer$.base| |v_ULTIMATE.start_sll_create_~new_head~0#1.base_57| v_ArrVal_454) |v_ULTIMATE.start_sll_create_~new_head~0#1.base_56| v_ArrVal_456) |c_ULTIMATE.start_node_create_with_sublist_~new_node~0#1.base| v_ArrVal_462) |c_ULTIMATE.start_sll_append_~head#1.base|) |c_ULTIMATE.start_sll_append_~head#1.offset|) 0)))))) (forall ((|v_ULTIMATE.start_sll_create_~new_head~0#1.base_57| Int)) (or (forall ((|v_ULTIMATE.start_sll_create_~new_head~0#1.base_56| Int) (v_ArrVal_455 (Array Int Int))) (or (forall ((v_ArrVal_457 (Array Int Int)) (v_ArrVal_463 (Array Int Int))) (= (select (select (store (store (store |c_#memory_$Pointer$.offset| |v_ULTIMATE.start_sll_create_~new_head~0#1.base_57| v_ArrVal_455) |v_ULTIMATE.start_sll_create_~new_head~0#1.base_56| v_ArrVal_457) |c_ULTIMATE.start_node_create_with_sublist_~new_node~0#1.base| v_ArrVal_463) |c_ULTIMATE.start_sll_append_~head#1.base|) |c_ULTIMATE.start_sll_append_~head#1.offset|) 0)) (< |c_#StackHeapBarrier| (+ |v_ULTIMATE.start_sll_create_~new_head~0#1.base_56| 1)))) (< |c_#StackHeapBarrier| (+ |v_ULTIMATE.start_sll_create_~new_head~0#1.base_57| 1))))) is different from false [2023-12-02 12:30:01,663 WARN L854 $PredicateComparison]: unable to prove that (and (forall ((|v_ULTIMATE.start_sll_create_~new_head~0#1.base_57| Int) (v_ArrVal_452 (Array Int Int))) (or (forall ((|v_ULTIMATE.start_sll_create_~new_head~0#1.base_56| Int) (v_ArrVal_455 (Array Int Int))) (or (< |c_#StackHeapBarrier| (+ |v_ULTIMATE.start_sll_create_~new_head~0#1.base_56| 1)) (forall ((v_ArrVal_457 (Array Int Int)) (v_ArrVal_463 (Array Int Int))) (= 0 (select (select (store (store (store (store |c_#memory_$Pointer$.offset| |c_ULTIMATE.start_sll_create_~new_head~0#1.base| v_ArrVal_452) |v_ULTIMATE.start_sll_create_~new_head~0#1.base_57| v_ArrVal_455) |v_ULTIMATE.start_sll_create_~new_head~0#1.base_56| v_ArrVal_457) |c_ULTIMATE.start_node_create_with_sublist_~new_node~0#1.base| v_ArrVal_463) |c_ULTIMATE.start_sll_append_~head#1.base|) |c_ULTIMATE.start_sll_append_~head#1.offset|))))) (< |c_#StackHeapBarrier| (+ |v_ULTIMATE.start_sll_create_~new_head~0#1.base_57| 1)))) (forall ((|v_ULTIMATE.start_sll_create_~new_head~0#1.base_57| Int)) (or (< |c_#StackHeapBarrier| (+ |v_ULTIMATE.start_sll_create_~new_head~0#1.base_57| 1)) (forall ((|v_ULTIMATE.start_sll_create_~new_head~0#1.base_56| Int) (v_ArrVal_454 (Array Int Int))) (or (< |c_#StackHeapBarrier| (+ |v_ULTIMATE.start_sll_create_~new_head~0#1.base_56| 1)) (forall ((v_ArrVal_462 (Array Int Int)) (v_ArrVal_456 (Array Int Int))) (= (select (select (store (store (store (store |c_#memory_$Pointer$.base| |c_ULTIMATE.start_sll_create_~new_head~0#1.base| (store (select |c_#memory_$Pointer$.base| |c_ULTIMATE.start_sll_create_~new_head~0#1.base|) |c_ULTIMATE.start_sll_create_~new_head~0#1.offset| |c_ULTIMATE.start_sll_create_~head~0#1.base|)) |v_ULTIMATE.start_sll_create_~new_head~0#1.base_57| v_ArrVal_454) |v_ULTIMATE.start_sll_create_~new_head~0#1.base_56| v_ArrVal_456) |c_ULTIMATE.start_node_create_with_sublist_~new_node~0#1.base| v_ArrVal_462) |c_ULTIMATE.start_sll_append_~head#1.base|) |c_ULTIMATE.start_sll_append_~head#1.offset|) 0))))))) is different from false [2023-12-02 12:30:10,265 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 11 not checked. [2023-12-02 12:30:10,265 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1653191685] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 12:30:10,265 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1138810724] [2023-12-02 12:30:10,267 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2023-12-02 12:30:10,267 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 12:30:10,268 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 12:30:10,268 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 12:30:10,268 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 12:30:10,873 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 12:30:12,944 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '5646#(and (= (select (select |#memory_$Pointer$.base| |ULTIMATE.start_sll_append_~head#1.base|) 0) |ULTIMATE.start_sll_append_~temp~0#1.base|) (<= 1 |#StackHeapBarrier|) (not (= (select |#valid| |ULTIMATE.start_sll_append_~temp~0#1.base|) 1)) (= |ULTIMATE.start_sll_append_~temp~0#1.offset| (select (select |#memory_$Pointer$.offset| |ULTIMATE.start_sll_append_~head#1.base|) 0)) (= 3 |ULTIMATE.start_sll_append_#in~sublist_length#1|) (= |ULTIMATE.start_node_create_with_sublist_#res#1.offset| 0) (= |ULTIMATE.start_sll_append_~sublist_length#1| 3) (= 3 |ULTIMATE.start_main_~i~0#1|) (= 5 |ULTIMATE.start_main_~max~0#1|) (<= 2 |ULTIMATE.start_sll_append_#in~head#1.base|) (exists ((|v_#memory_$Pointer$.offset_102| (Array Int (Array Int Int)))) (= |#memory_$Pointer$.offset| (store (store |v_#memory_$Pointer$.offset_102| |ULTIMATE.start_node_create_with_sublist_#res#1.base| (store (store (select |v_#memory_$Pointer$.offset_102| |ULTIMATE.start_node_create_with_sublist_#res#1.base|) 4 0) 0 0)) |ULTIMATE.start_sll_append_~new_last~0#1.base| (store (select (store |v_#memory_$Pointer$.offset_102| |ULTIMATE.start_node_create_with_sublist_#res#1.base| (store (store (select |v_#memory_$Pointer$.offset_102| |ULTIMATE.start_node_create_with_sublist_#res#1.base|) 4 0) 0 0)) |ULTIMATE.start_sll_append_~new_last~0#1.base|) 0 0)))) (= |ULTIMATE.start_main_~#head~1#1.offset| 0) (or (not (= |ULTIMATE.start_sll_append_~temp~0#1.base| 0)) (not (= |ULTIMATE.start_sll_append_~temp~0#1.offset| 0))) (= |ULTIMATE.start_sll_append_~head#1.offset| 0) (exists ((|v_#memory_int_65| (Array Int (Array Int Int))) (|v_#memory_int_66| (Array Int (Array Int Int))) (|v_#memory_int_67| (Array Int (Array Int Int)))) (and (= (store |v_#memory_int_66| |ULTIMATE.start_node_create_with_sublist_#res#1.base| (store (select |v_#memory_int_66| |ULTIMATE.start_node_create_with_sublist_#res#1.base|) 0 (select (select |v_#memory_int_67| |ULTIMATE.start_node_create_with_sublist_#res#1.base|) 0))) |v_#memory_int_67|) (= (store |v_#memory_int_65| |ULTIMATE.start_node_create_with_sublist_#res#1.base| (store (select |v_#memory_int_65| |ULTIMATE.start_node_create_with_sublist_#res#1.base|) 4 (select (select |v_#memory_int_66| |ULTIMATE.start_node_create_with_sublist_#res#1.base|) 4))) |v_#memory_int_66|) (= (store |v_#memory_int_67| |ULTIMATE.start_sll_append_~new_last~0#1.base| (store (select |v_#memory_int_67| |ULTIMATE.start_sll_append_~new_last~0#1.base|) 0 (select (select |#memory_int| |ULTIMATE.start_sll_append_~new_last~0#1.base|) 0))) |#memory_int|))) (= |ULTIMATE.start_sll_create_#res#1.offset| 0) (<= 4 (select |#length| |ULTIMATE.start_sll_append_~head#1.base|)) (= 3 |ULTIMATE.start_main_~min~0#1|) (= (select |#valid| |ULTIMATE.start_node_create_with_sublist_#res#1.base|) 1) (<= 2 |ULTIMATE.start_sll_append_~head#1.base|) (<= 2 |ULTIMATE.start_main_~#head~1#1.base|) (exists ((|v_#memory_$Pointer$.base_102| (Array Int (Array Int Int)))) (= |#memory_$Pointer$.base| (store (store |v_#memory_$Pointer$.base_102| |ULTIMATE.start_node_create_with_sublist_#res#1.base| (store (store (select |v_#memory_$Pointer$.base_102| |ULTIMATE.start_node_create_with_sublist_#res#1.base|) 4 |ULTIMATE.start_sll_create_#res#1.base|) 0 0)) |ULTIMATE.start_sll_append_~new_last~0#1.base| (store (select (store |v_#memory_$Pointer$.base_102| |ULTIMATE.start_node_create_with_sublist_#res#1.base| (store (store (select |v_#memory_$Pointer$.base_102| |ULTIMATE.start_node_create_with_sublist_#res#1.base|) 4 |ULTIMATE.start_sll_create_#res#1.base|) 0 0)) |ULTIMATE.start_sll_append_~new_last~0#1.base|) 0 0)))) (= |ULTIMATE.start_sll_append_~new_last~0#1.offset| 0) (<= 8 (select |#length| |ULTIMATE.start_node_create_with_sublist_#res#1.base|)) (= |ULTIMATE.start_main_~j~0#1| 0) (= |ULTIMATE.start_sll_append_#in~head#1.offset| 0) (= (select |#valid| |ULTIMATE.start_sll_append_~head#1.base|) 1) (= |ULTIMATE.start_node_create_with_sublist_#res#1.base| |ULTIMATE.start_sll_append_~new_last~0#1.base|))' at error location [2023-12-02 12:30:12,944 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 12:30:12,944 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 12:30:12,944 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 13, 13] total 30 [2023-12-02 12:30:12,944 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [401157754] [2023-12-02 12:30:12,944 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 12:30:12,945 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 31 states [2023-12-02 12:30:12,945 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 12:30:12,945 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2023-12-02 12:30:12,946 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=202, Invalid=1264, Unknown=32, NotChecked=308, Total=1806 [2023-12-02 12:30:12,947 INFO L87 Difference]: Start difference. First operand 152 states and 188 transitions. Second operand has 31 states, 31 states have (on average 1.8709677419354838) internal successors, (58), 30 states have internal predecessors, (58), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 12:30:14,011 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 12:30:14,011 INFO L93 Difference]: Finished difference Result 209 states and 248 transitions. [2023-12-02 12:30:14,011 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2023-12-02 12:30:14,011 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 31 states have (on average 1.8709677419354838) internal successors, (58), 30 states have internal predecessors, (58), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 22 [2023-12-02 12:30:14,012 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 12:30:14,014 INFO L225 Difference]: With dead ends: 209 [2023-12-02 12:30:14,014 INFO L226 Difference]: Without dead ends: 209 [2023-12-02 12:30:14,015 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 86 GetRequests, 35 SyntacticMatches, 3 SemanticMatches, 48 ConstructedPredicates, 4 IntricatePredicates, 0 DeprecatedPredicates, 769 ImplicationChecksByTransitivity, 17.4s TimeCoverageRelationStatistics Valid=316, Invalid=1738, Unknown=32, NotChecked=364, Total=2450 [2023-12-02 12:30:14,016 INFO L413 NwaCegarLoop]: 57 mSDtfsCounter, 22 mSDsluCounter, 745 mSDsCounter, 0 mSdLazyCounter, 505 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 22 SdHoareTripleChecker+Valid, 802 SdHoareTripleChecker+Invalid, 732 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 505 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 213 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2023-12-02 12:30:14,016 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [22 Valid, 802 Invalid, 732 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 505 Invalid, 0 Unknown, 213 Unchecked, 0.5s Time] [2023-12-02 12:30:14,017 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 209 states. [2023-12-02 12:30:14,021 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 209 to 203. [2023-12-02 12:30:14,022 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 203 states, 177 states have (on average 1.3672316384180792) internal successors, (242), 202 states have internal predecessors, (242), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 12:30:14,023 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 203 states to 203 states and 242 transitions. [2023-12-02 12:30:14,023 INFO L78 Accepts]: Start accepts. Automaton has 203 states and 242 transitions. Word has length 22 [2023-12-02 12:30:14,023 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 12:30:14,023 INFO L495 AbstractCegarLoop]: Abstraction has 203 states and 242 transitions. [2023-12-02 12:30:14,023 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 31 states, 31 states have (on average 1.8709677419354838) internal successors, (58), 30 states have internal predecessors, (58), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 12:30:14,023 INFO L276 IsEmpty]: Start isEmpty. Operand 203 states and 242 transitions. [2023-12-02 12:30:14,024 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2023-12-02 12:30:14,024 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 12:30:14,025 INFO L195 NwaCegarLoop]: trace histogram [4, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 12:30:14,029 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0bfdaf3-5b1c-4197-b2a8-f0c22aad57c8/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Ended with exit code 0 [2023-12-02 12:30:14,225 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0bfdaf3-5b1c-4197-b2a8-f0c22aad57c8/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2023-12-02 12:30:14,225 INFO L420 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr20REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 39 more)] === [2023-12-02 12:30:14,226 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 12:30:14,226 INFO L85 PathProgramCache]: Analyzing trace with hash 2116570961, now seen corresponding path program 1 times [2023-12-02 12:30:14,226 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 12:30:14,226 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1814551032] [2023-12-02 12:30:14,226 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 12:30:14,226 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 12:30:14,249 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 12:30:14,450 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 11 proven. 0 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2023-12-02 12:30:14,450 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 12:30:14,450 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1814551032] [2023-12-02 12:30:14,451 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1814551032] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 12:30:14,451 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 12:30:14,451 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2023-12-02 12:30:14,451 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1172584385] [2023-12-02 12:30:14,451 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 12:30:14,451 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-12-02 12:30:14,452 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 12:30:14,452 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-12-02 12:30:14,452 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2023-12-02 12:30:14,453 INFO L87 Difference]: Start difference. First operand 203 states and 242 transitions. Second operand has 7 states, 6 states have (on average 4.666666666666667) internal successors, (28), 7 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 12:30:14,687 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 12:30:14,687 INFO L93 Difference]: Finished difference Result 346 states and 405 transitions. [2023-12-02 12:30:14,687 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2023-12-02 12:30:14,687 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 4.666666666666667) internal successors, (28), 7 states have internal predecessors, (28), 0 states have call successors, (0), 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 40 [2023-12-02 12:30:14,688 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 12:30:14,690 INFO L225 Difference]: With dead ends: 346 [2023-12-02 12:30:14,690 INFO L226 Difference]: Without dead ends: 346 [2023-12-02 12:30:14,690 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=27, Invalid=63, Unknown=0, NotChecked=0, Total=90 [2023-12-02 12:30:14,691 INFO L413 NwaCegarLoop]: 46 mSDtfsCounter, 201 mSDsluCounter, 188 mSDsCounter, 0 mSdLazyCounter, 249 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 201 SdHoareTripleChecker+Valid, 234 SdHoareTripleChecker+Invalid, 257 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 249 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-12-02 12:30:14,691 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [201 Valid, 234 Invalid, 257 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 249 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-12-02 12:30:14,692 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 346 states. [2023-12-02 12:30:14,696 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 346 to 222. [2023-12-02 12:30:14,696 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 222 states, 197 states have (on average 1.365482233502538) internal successors, (269), 221 states have internal predecessors, (269), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 12:30:14,697 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 222 states to 222 states and 269 transitions. [2023-12-02 12:30:14,697 INFO L78 Accepts]: Start accepts. Automaton has 222 states and 269 transitions. Word has length 40 [2023-12-02 12:30:14,697 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 12:30:14,698 INFO L495 AbstractCegarLoop]: Abstraction has 222 states and 269 transitions. [2023-12-02 12:30:14,698 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 6 states have (on average 4.666666666666667) internal successors, (28), 7 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 12:30:14,698 INFO L276 IsEmpty]: Start isEmpty. Operand 222 states and 269 transitions. [2023-12-02 12:30:14,699 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2023-12-02 12:30:14,699 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 12:30:14,699 INFO L195 NwaCegarLoop]: trace histogram [4, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 12:30:14,699 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2023-12-02 12:30:14,699 INFO L420 AbstractCegarLoop]: === Iteration 19 === Targeting ULTIMATE.startErr21REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 39 more)] === [2023-12-02 12:30:14,700 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 12:30:14,700 INFO L85 PathProgramCache]: Analyzing trace with hash 2116570962, now seen corresponding path program 1 times [2023-12-02 12:30:14,700 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 12:30:14,700 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1858805116] [2023-12-02 12:30:14,700 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 12:30:14,701 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 12:30:14,723 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 12:30:14,910 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 14 proven. 19 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 12:30:14,910 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 12:30:14,910 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1858805116] [2023-12-02 12:30:14,910 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1858805116] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 12:30:14,910 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [678002175] [2023-12-02 12:30:14,911 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 12:30:14,911 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 12:30:14,911 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0bfdaf3-5b1c-4197-b2a8-f0c22aad57c8/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 12:30:14,912 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0bfdaf3-5b1c-4197-b2a8-f0c22aad57c8/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 12:30:14,917 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0bfdaf3-5b1c-4197-b2a8-f0c22aad57c8/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2023-12-02 12:30:15,034 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 12:30:15,036 INFO L262 TraceCheckSpWp]: Trace formula consists of 322 conjuncts, 14 conjunts are in the unsatisfiable core [2023-12-02 12:30:15,038 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 12:30:15,080 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 21 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 12:30:15,080 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 12:30:15,145 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 21 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 12:30:15,145 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [678002175] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 12:30:15,146 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1221152684] [2023-12-02 12:30:15,147 INFO L159 IcfgInterpreter]: Started Sifa with 23 locations of interest [2023-12-02 12:30:15,147 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 12:30:15,147 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 12:30:15,148 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 12:30:15,148 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 12:30:16,810 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 12:30:49,295 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '6917#(and (<= 1 |#StackHeapBarrier|) (or (< (+ |ULTIMATE.start_main_~ptr~0#1.offset| 4) 0) (< (select |#length| |ULTIMATE.start_main_~ptr~0#1.base|) (+ |ULTIMATE.start_main_~ptr~0#1.offset| 8))) (or (not (= |ULTIMATE.start_main_~ptr~0#1.base| 0)) (not (= |ULTIMATE.start_main_~ptr~0#1.offset| 0))) (= 3 |ULTIMATE.start_main_~i~0#1|) (= 5 |ULTIMATE.start_main_~max~0#1|) (= |ULTIMATE.start_main_~ptr~0#1.base| (select (select |#memory_$Pointer$.base| |ULTIMATE.start_main_~#head~1#1.base|) 0)) (= |ULTIMATE.start_main_~#head~1#1.offset| 0) (= |ULTIMATE.start_main_~ptr~0#1.offset| (select (select |#memory_$Pointer$.offset| |ULTIMATE.start_main_~#head~1#1.base|) 0)) (= 3 |ULTIMATE.start_main_~min~0#1|) (= (select |#valid| |ULTIMATE.start_main_~#head~1#1.base|) 1) (<= 2 |ULTIMATE.start_main_~#head~1#1.base|) (<= 4 (select |#length| |ULTIMATE.start_main_~#head~1#1.base|)))' at error location [2023-12-02 12:30:49,295 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 12:30:49,295 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 12:30:49,296 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 15 [2023-12-02 12:30:49,296 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [595468281] [2023-12-02 12:30:49,296 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 12:30:49,296 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2023-12-02 12:30:49,296 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 12:30:49,297 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2023-12-02 12:30:49,297 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=161, Invalid=883, Unknown=12, NotChecked=0, Total=1056 [2023-12-02 12:30:49,297 INFO L87 Difference]: Start difference. First operand 222 states and 269 transitions. Second operand has 16 states, 16 states have (on average 3.9375) internal successors, (63), 15 states have internal predecessors, (63), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 12:30:49,737 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 12:30:49,737 INFO L93 Difference]: Finished difference Result 305 states and 349 transitions. [2023-12-02 12:30:49,737 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2023-12-02 12:30:49,737 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 3.9375) internal successors, (63), 15 states have internal predecessors, (63), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 40 [2023-12-02 12:30:49,737 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 12:30:49,739 INFO L225 Difference]: With dead ends: 305 [2023-12-02 12:30:49,739 INFO L226 Difference]: Without dead ends: 305 [2023-12-02 12:30:49,739 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 138 GetRequests, 90 SyntacticMatches, 6 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 646 ImplicationChecksByTransitivity, 32.7s TimeCoverageRelationStatistics Valid=308, Invalid=1572, Unknown=12, NotChecked=0, Total=1892 [2023-12-02 12:30:49,740 INFO L413 NwaCegarLoop]: 126 mSDtfsCounter, 275 mSDsluCounter, 544 mSDsCounter, 0 mSdLazyCounter, 425 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 275 SdHoareTripleChecker+Valid, 670 SdHoareTripleChecker+Invalid, 431 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 425 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-12-02 12:30:49,740 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [275 Valid, 670 Invalid, 431 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 425 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-12-02 12:30:49,741 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 305 states. [2023-12-02 12:30:49,752 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 305 to 255. [2023-12-02 12:30:49,752 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 255 states, 230 states have (on average 1.373913043478261) internal successors, (316), 254 states have internal predecessors, (316), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 12:30:49,753 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 255 states to 255 states and 316 transitions. [2023-12-02 12:30:49,753 INFO L78 Accepts]: Start accepts. Automaton has 255 states and 316 transitions. Word has length 40 [2023-12-02 12:30:49,754 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 12:30:49,754 INFO L495 AbstractCegarLoop]: Abstraction has 255 states and 316 transitions. [2023-12-02 12:30:49,754 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 3.9375) internal successors, (63), 15 states have internal predecessors, (63), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 12:30:49,754 INFO L276 IsEmpty]: Start isEmpty. Operand 255 states and 316 transitions. [2023-12-02 12:30:49,754 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2023-12-02 12:30:49,755 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 12:30:49,755 INFO L195 NwaCegarLoop]: trace histogram [4, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 12:30:49,760 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0bfdaf3-5b1c-4197-b2a8-f0c22aad57c8/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Ended with exit code 0 [2023-12-02 12:30:49,955 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0bfdaf3-5b1c-4197-b2a8-f0c22aad57c8/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 12:30:49,955 INFO L420 AbstractCegarLoop]: === Iteration 20 === Targeting ULTIMATE.startErr21REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 39 more)] === [2023-12-02 12:30:49,956 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 12:30:49,956 INFO L85 PathProgramCache]: Analyzing trace with hash -1131057998, now seen corresponding path program 2 times [2023-12-02 12:30:49,956 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 12:30:49,956 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [582626988] [2023-12-02 12:30:49,956 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 12:30:49,956 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 12:30:49,975 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 12:30:50,259 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 9 proven. 0 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2023-12-02 12:30:50,259 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 12:30:50,259 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [582626988] [2023-12-02 12:30:50,259 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [582626988] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 12:30:50,259 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 12:30:50,260 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2023-12-02 12:30:50,260 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [750874831] [2023-12-02 12:30:50,260 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 12:30:50,260 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-12-02 12:30:50,260 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 12:30:50,261 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-12-02 12:30:50,261 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2023-12-02 12:30:50,261 INFO L87 Difference]: Start difference. First operand 255 states and 316 transitions. Second operand has 7 states, 6 states have (on average 4.5) internal successors, (27), 7 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 12:30:50,563 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 12:30:50,563 INFO L93 Difference]: Finished difference Result 393 states and 492 transitions. [2023-12-02 12:30:50,563 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2023-12-02 12:30:50,564 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 4.5) internal successors, (27), 7 states have internal predecessors, (27), 0 states have call successors, (0), 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 40 [2023-12-02 12:30:50,564 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 12:30:50,565 INFO L225 Difference]: With dead ends: 393 [2023-12-02 12:30:50,566 INFO L226 Difference]: Without dead ends: 393 [2023-12-02 12:30:50,566 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=25, Invalid=65, Unknown=0, NotChecked=0, Total=90 [2023-12-02 12:30:50,566 INFO L413 NwaCegarLoop]: 51 mSDtfsCounter, 167 mSDsluCounter, 185 mSDsCounter, 0 mSdLazyCounter, 203 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 167 SdHoareTripleChecker+Valid, 236 SdHoareTripleChecker+Invalid, 208 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 203 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-12-02 12:30:50,567 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [167 Valid, 236 Invalid, 208 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 203 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-12-02 12:30:50,568 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 393 states. [2023-12-02 12:30:50,573 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 393 to 280. [2023-12-02 12:30:50,574 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 280 states, 255 states have (on average 1.4039215686274509) internal successors, (358), 279 states have internal predecessors, (358), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 12:30:50,574 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 280 states to 280 states and 358 transitions. [2023-12-02 12:30:50,575 INFO L78 Accepts]: Start accepts. Automaton has 280 states and 358 transitions. Word has length 40 [2023-12-02 12:30:50,575 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 12:30:50,575 INFO L495 AbstractCegarLoop]: Abstraction has 280 states and 358 transitions. [2023-12-02 12:30:50,575 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 6 states have (on average 4.5) internal successors, (27), 7 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 12:30:50,575 INFO L276 IsEmpty]: Start isEmpty. Operand 280 states and 358 transitions. [2023-12-02 12:30:50,576 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2023-12-02 12:30:50,576 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 12:30:50,576 INFO L195 NwaCegarLoop]: trace histogram [4, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 12:30:50,576 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2023-12-02 12:30:50,576 INFO L420 AbstractCegarLoop]: === Iteration 21 === Targeting ULTIMATE.startErr28REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 39 more)] === [2023-12-02 12:30:50,577 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 12:30:50,577 INFO L85 PathProgramCache]: Analyzing trace with hash -1126026077, now seen corresponding path program 1 times [2023-12-02 12:30:50,577 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 12:30:50,577 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [186595326] [2023-12-02 12:30:50,577 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 12:30:50,577 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 12:30:50,595 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 12:30:50,692 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 33 trivial. 0 not checked. [2023-12-02 12:30:50,693 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 12:30:50,693 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [186595326] [2023-12-02 12:30:50,693 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [186595326] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 12:30:50,693 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 12:30:50,693 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2023-12-02 12:30:50,693 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2056120619] [2023-12-02 12:30:50,693 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 12:30:50,694 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-12-02 12:30:50,694 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 12:30:50,694 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-12-02 12:30:50,694 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2023-12-02 12:30:50,694 INFO L87 Difference]: Start difference. First operand 280 states and 358 transitions. Second operand has 5 states, 5 states have (on average 5.0) internal successors, (25), 5 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 12:30:50,875 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 12:30:50,875 INFO L93 Difference]: Finished difference Result 320 states and 416 transitions. [2023-12-02 12:30:50,875 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-12-02 12:30:50,876 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 5.0) internal successors, (25), 5 states have internal predecessors, (25), 0 states have call successors, (0), 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 40 [2023-12-02 12:30:50,876 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 12:30:50,877 INFO L225 Difference]: With dead ends: 320 [2023-12-02 12:30:50,877 INFO L226 Difference]: Without dead ends: 320 [2023-12-02 12:30:50,878 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 [2023-12-02 12:30:50,878 INFO L413 NwaCegarLoop]: 60 mSDtfsCounter, 38 mSDsluCounter, 158 mSDsCounter, 0 mSdLazyCounter, 135 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 38 SdHoareTripleChecker+Valid, 218 SdHoareTripleChecker+Invalid, 137 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 135 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 12:30:50,878 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [38 Valid, 218 Invalid, 137 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 135 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 12:30:50,879 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 320 states. [2023-12-02 12:30:50,883 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 320 to 309. [2023-12-02 12:30:50,883 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 309 states, 284 states have (on average 1.4401408450704225) internal successors, (409), 308 states have internal predecessors, (409), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 12:30:50,884 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 309 states to 309 states and 409 transitions. [2023-12-02 12:30:50,885 INFO L78 Accepts]: Start accepts. Automaton has 309 states and 409 transitions. Word has length 40 [2023-12-02 12:30:50,885 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 12:30:50,885 INFO L495 AbstractCegarLoop]: Abstraction has 309 states and 409 transitions. [2023-12-02 12:30:50,885 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 5.0) internal successors, (25), 5 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 12:30:50,885 INFO L276 IsEmpty]: Start isEmpty. Operand 309 states and 409 transitions. [2023-12-02 12:30:50,886 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2023-12-02 12:30:50,886 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 12:30:50,886 INFO L195 NwaCegarLoop]: trace histogram [4, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 12:30:50,886 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20 [2023-12-02 12:30:50,886 INFO L420 AbstractCegarLoop]: === Iteration 22 === Targeting ULTIMATE.startErr41ASSERT_VIOLATIONMEMORY_LEAK === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 39 more)] === [2023-12-02 12:30:50,886 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 12:30:50,886 INFO L85 PathProgramCache]: Analyzing trace with hash -1126023484, now seen corresponding path program 1 times [2023-12-02 12:30:50,887 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 12:30:50,887 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1534869344] [2023-12-02 12:30:50,887 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 12:30:50,887 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 12:30:50,907 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 12:30:51,075 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 9 proven. 0 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2023-12-02 12:30:51,076 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 12:30:51,076 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1534869344] [2023-12-02 12:30:51,076 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1534869344] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 12:30:51,076 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 12:30:51,076 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2023-12-02 12:30:51,076 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1784348037] [2023-12-02 12:30:51,076 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 12:30:51,077 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2023-12-02 12:30:51,077 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 12:30:51,077 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2023-12-02 12:30:51,077 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-12-02 12:30:51,078 INFO L87 Difference]: Start difference. First operand 309 states and 409 transitions. Second operand has 6 states, 6 states have (on average 4.5) internal successors, (27), 6 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 12:30:51,312 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 12:30:51,312 INFO L93 Difference]: Finished difference Result 394 states and 508 transitions. [2023-12-02 12:30:51,313 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2023-12-02 12:30:51,313 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 4.5) internal successors, (27), 6 states have internal predecessors, (27), 0 states have call successors, (0), 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 40 [2023-12-02 12:30:51,313 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 12:30:51,315 INFO L225 Difference]: With dead ends: 394 [2023-12-02 12:30:51,316 INFO L226 Difference]: Without dead ends: 394 [2023-12-02 12:30:51,316 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=21, Invalid=51, Unknown=0, NotChecked=0, Total=72 [2023-12-02 12:30:51,316 INFO L413 NwaCegarLoop]: 63 mSDtfsCounter, 111 mSDsluCounter, 224 mSDsCounter, 0 mSdLazyCounter, 152 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 111 SdHoareTripleChecker+Valid, 287 SdHoareTripleChecker+Invalid, 153 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 152 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-12-02 12:30:51,317 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [111 Valid, 287 Invalid, 153 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 152 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-12-02 12:30:51,317 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 394 states. [2023-12-02 12:30:51,323 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 394 to 309. [2023-12-02 12:30:51,324 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 309 states, 284 states have (on average 1.4190140845070423) internal successors, (403), 308 states have internal predecessors, (403), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 12:30:51,325 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 309 states to 309 states and 403 transitions. [2023-12-02 12:30:51,325 INFO L78 Accepts]: Start accepts. Automaton has 309 states and 403 transitions. Word has length 40 [2023-12-02 12:30:51,326 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 12:30:51,326 INFO L495 AbstractCegarLoop]: Abstraction has 309 states and 403 transitions. [2023-12-02 12:30:51,326 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 4.5) internal successors, (27), 6 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 12:30:51,326 INFO L276 IsEmpty]: Start isEmpty. Operand 309 states and 403 transitions. [2023-12-02 12:30:51,327 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2023-12-02 12:30:51,327 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 12:30:51,327 INFO L195 NwaCegarLoop]: trace histogram [4, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 12:30:51,327 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21 [2023-12-02 12:30:51,327 INFO L420 AbstractCegarLoop]: === Iteration 23 === Targeting ULTIMATE.startErr40ASSERT_VIOLATIONMEMORY_LEAK === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 39 more)] === [2023-12-02 12:30:51,328 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 12:30:51,328 INFO L85 PathProgramCache]: Analyzing trace with hash -703013678, now seen corresponding path program 1 times [2023-12-02 12:30:51,328 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 12:30:51,328 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1697844098] [2023-12-02 12:30:51,328 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 12:30:51,329 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 12:30:51,349 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 12:30:51,467 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 0 proven. 13 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2023-12-02 12:30:51,467 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 12:30:51,467 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1697844098] [2023-12-02 12:30:51,467 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1697844098] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 12:30:51,467 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1289682478] [2023-12-02 12:30:51,467 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 12:30:51,468 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 12:30:51,468 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0bfdaf3-5b1c-4197-b2a8-f0c22aad57c8/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 12:30:51,469 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0bfdaf3-5b1c-4197-b2a8-f0c22aad57c8/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 12:30:51,471 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0bfdaf3-5b1c-4197-b2a8-f0c22aad57c8/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2023-12-02 12:30:51,625 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 12:30:51,627 INFO L262 TraceCheckSpWp]: Trace formula consists of 323 conjuncts, 4 conjunts are in the unsatisfiable core [2023-12-02 12:30:51,629 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 12:30:51,804 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 33 trivial. 0 not checked. [2023-12-02 12:30:51,804 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 12:30:51,805 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1289682478] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 12:30:51,805 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 12:30:51,805 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [4] total 6 [2023-12-02 12:30:51,805 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [231372414] [2023-12-02 12:30:51,805 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 12:30:51,806 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-12-02 12:30:51,806 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 12:30:51,806 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-12-02 12:30:51,806 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2023-12-02 12:30:51,806 INFO L87 Difference]: Start difference. First operand 309 states and 403 transitions. Second operand has 4 states, 4 states have (on average 6.5) internal successors, (26), 3 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 12:30:51,932 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 12:30:51,932 INFO L93 Difference]: Finished difference Result 354 states and 455 transitions. [2023-12-02 12:30:51,933 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-12-02 12:30:51,933 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 6.5) internal successors, (26), 3 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 41 [2023-12-02 12:30:51,933 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 12:30:51,935 INFO L225 Difference]: With dead ends: 354 [2023-12-02 12:30:51,935 INFO L226 Difference]: Without dead ends: 354 [2023-12-02 12:30:51,935 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 39 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=24, Invalid=32, Unknown=0, NotChecked=0, Total=56 [2023-12-02 12:30:51,936 INFO L413 NwaCegarLoop]: 53 mSDtfsCounter, 155 mSDsluCounter, 51 mSDsCounter, 0 mSdLazyCounter, 72 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 155 SdHoareTripleChecker+Valid, 104 SdHoareTripleChecker+Invalid, 73 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 72 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 12:30:51,936 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [155 Valid, 104 Invalid, 73 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 72 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 12:30:51,937 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 354 states. [2023-12-02 12:30:51,943 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 354 to 307. [2023-12-02 12:30:51,944 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 307 states, 282 states have (on average 1.4148936170212767) internal successors, (399), 306 states have internal predecessors, (399), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 12:30:51,945 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 307 states to 307 states and 399 transitions. [2023-12-02 12:30:51,946 INFO L78 Accepts]: Start accepts. Automaton has 307 states and 399 transitions. Word has length 41 [2023-12-02 12:30:51,946 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 12:30:51,946 INFO L495 AbstractCegarLoop]: Abstraction has 307 states and 399 transitions. [2023-12-02 12:30:51,946 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 6.5) internal successors, (26), 3 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 12:30:51,946 INFO L276 IsEmpty]: Start isEmpty. Operand 307 states and 399 transitions. [2023-12-02 12:30:51,947 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2023-12-02 12:30:51,947 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 12:30:51,947 INFO L195 NwaCegarLoop]: trace histogram [4, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 12:30:51,952 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0bfdaf3-5b1c-4197-b2a8-f0c22aad57c8/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Ended with exit code 0 [2023-12-02 12:30:52,152 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0bfdaf3-5b1c-4197-b2a8-f0c22aad57c8/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable22 [2023-12-02 12:30:52,152 INFO L420 AbstractCegarLoop]: === Iteration 24 === Targeting ULTIMATE.startErr22REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 39 more)] === [2023-12-02 12:30:52,153 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 12:30:52,153 INFO L85 PathProgramCache]: Analyzing trace with hash -319888755, now seen corresponding path program 1 times [2023-12-02 12:30:52,153 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 12:30:52,153 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [654728970] [2023-12-02 12:30:52,153 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 12:30:52,153 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 12:30:52,194 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 12:30:53,172 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 3 proven. 9 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2023-12-02 12:30:53,172 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 12:30:53,172 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [654728970] [2023-12-02 12:30:53,172 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [654728970] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 12:30:53,172 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1376496768] [2023-12-02 12:30:53,172 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 12:30:53,173 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 12:30:53,173 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0bfdaf3-5b1c-4197-b2a8-f0c22aad57c8/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 12:30:53,173 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0bfdaf3-5b1c-4197-b2a8-f0c22aad57c8/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 12:30:53,174 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0bfdaf3-5b1c-4197-b2a8-f0c22aad57c8/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2023-12-02 12:30:53,317 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 12:30:53,320 INFO L262 TraceCheckSpWp]: Trace formula consists of 343 conjuncts, 70 conjunts are in the unsatisfiable core [2023-12-02 12:30:53,324 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 12:30:53,327 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2023-12-02 12:30:53,374 INFO L349 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2023-12-02 12:30:53,375 INFO L378 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 [2023-12-02 12:30:53,499 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2023-12-02 12:30:53,639 INFO L378 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 [2023-12-02 12:30:53,690 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 13 [2023-12-02 12:30:53,736 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2023-12-02 12:30:53,748 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 20 [2023-12-02 12:30:53,844 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 40 treesize of output 31 [2023-12-02 12:30:53,852 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 22 [2023-12-02 12:30:54,221 INFO L349 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2023-12-02 12:30:54,221 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 4 new quantified variables, introduced 3 case distinctions, treesize of input 66 treesize of output 33 [2023-12-02 12:30:54,228 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 22 treesize of output 10 [2023-12-02 12:30:54,232 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 7 proven. 9 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2023-12-02 12:30:54,232 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 12:30:54,631 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-12-02 12:30:54,632 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 1424 treesize of output 1405