./Ultimate.py --spec ../../sv-benchmarks/c/properties/valid-memsafety.prp --file ../../sv-benchmarks/c/array-memsafety/openbsd_cstrspn-alloca-2.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for memory safety (deref-memtrack) Using default analysis Version 0e0057cc Calling Ultimate with: /usr/lib/jvm/java-1.11.0-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/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_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/config/TaipanMemDerefMemtrack.xml -i ../../sv-benchmarks/c/array-memsafety/openbsd_cstrspn-alloca-2.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/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_1b1b50e5-c053-40e8-9319-0a537f00247e/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 e27d2e3e94b55a3b3138a7f2b03714931363cb725f69630c5958681cf34de99e --- Real Ultimate output --- This is Ultimate 0.2.4-dev-0e0057c [2023-12-02 08:33:30,076 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-12-02 08:33:30,139 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/config/svcomp-DerefFreeMemtrack-32bit-Taipan_Default.epf [2023-12-02 08:33:30,145 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-12-02 08:33:30,146 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-12-02 08:33:30,171 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-12-02 08:33:30,171 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-12-02 08:33:30,172 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-12-02 08:33:30,173 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-12-02 08:33:30,173 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-12-02 08:33:30,174 INFO L153 SettingsManager]: * User list type=DISABLED [2023-12-02 08:33:30,174 INFO L151 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-12-02 08:33:30,175 INFO L153 SettingsManager]: * Explicit value domain=true [2023-12-02 08:33:30,175 INFO L153 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-12-02 08:33:30,176 INFO L153 SettingsManager]: * Octagon Domain=false [2023-12-02 08:33:30,176 INFO L153 SettingsManager]: * Abstract domain=CompoundDomain [2023-12-02 08:33:30,177 INFO L153 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-12-02 08:33:30,177 INFO L153 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-12-02 08:33:30,178 INFO L153 SettingsManager]: * Interval Domain=false [2023-12-02 08:33:30,178 INFO L151 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-12-02 08:33:30,179 INFO L153 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-12-02 08:33:30,180 INFO L153 SettingsManager]: * Simplification Technique=POLY_PAC [2023-12-02 08:33:30,180 INFO L151 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2023-12-02 08:33:30,181 INFO L153 SettingsManager]: * Create parallel compositions if possible=false [2023-12-02 08:33:30,181 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-12-02 08:33:30,182 INFO L153 SettingsManager]: * sizeof long=4 [2023-12-02 08:33:30,182 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-12-02 08:33:30,183 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-12-02 08:33:30,183 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-12-02 08:33:30,183 INFO L153 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2023-12-02 08:33:30,184 INFO L153 SettingsManager]: * Bitprecise bitfields=true [2023-12-02 08:33:30,184 INFO L153 SettingsManager]: * SV-COMP memtrack compatibility mode=true [2023-12-02 08:33:30,185 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-12-02 08:33:30,185 INFO L153 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2023-12-02 08:33:30,185 INFO L153 SettingsManager]: * Check unreachability of reach_error function=false [2023-12-02 08:33:30,185 INFO L153 SettingsManager]: * sizeof long double=12 [2023-12-02 08:33:30,186 INFO L153 SettingsManager]: * Use constant arrays=true [2023-12-02 08:33:30,186 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-12-02 08:33:30,186 INFO L153 SettingsManager]: * Only consider context switches at boundaries of atomic blocks=true [2023-12-02 08:33:30,186 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-12-02 08:33:30,186 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-12-02 08:33:30,187 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-12-02 08:33:30,187 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-12-02 08:33:30,187 INFO L153 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-12-02 08:33:30,187 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-12-02 08:33:30,187 INFO L153 SettingsManager]: * Apply one-shot large block encoding in concurrent analysis=false [2023-12-02 08:33:30,188 INFO L153 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-12-02 08:33:30,188 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-12-02 08:33:30,188 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_1b1b50e5-c053-40e8-9319-0a537f00247e/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> e27d2e3e94b55a3b3138a7f2b03714931363cb725f69630c5958681cf34de99e [2023-12-02 08:33:30,381 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-12-02 08:33:30,400 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-12-02 08:33:30,403 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-12-02 08:33:30,404 INFO L270 PluginConnector]: Initializing CDTParser... [2023-12-02 08:33:30,405 INFO L274 PluginConnector]: CDTParser initialized [2023-12-02 08:33:30,406 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/../../sv-benchmarks/c/array-memsafety/openbsd_cstrspn-alloca-2.i [2023-12-02 08:33:33,192 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-12-02 08:33:33,388 INFO L384 CDTParser]: Found 1 translation units. [2023-12-02 08:33:33,389 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/sv-benchmarks/c/array-memsafety/openbsd_cstrspn-alloca-2.i [2023-12-02 08:33:33,401 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/data/44ec8e7ad/1e3e662172914ebcb4bb12d86371154e/FLAG8f6ea7654 [2023-12-02 08:33:33,412 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/data/44ec8e7ad/1e3e662172914ebcb4bb12d86371154e [2023-12-02 08:33:33,415 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-12-02 08:33:33,416 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-12-02 08:33:33,418 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-12-02 08:33:33,418 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-12-02 08:33:33,423 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-12-02 08:33:33,423 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.12 08:33:33" (1/1) ... [2023-12-02 08:33:33,425 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@59c4d5eb and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 08:33:33, skipping insertion in model container [2023-12-02 08:33:33,425 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.12 08:33:33" (1/1) ... [2023-12-02 08:33:33,469 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-12-02 08:33:33,718 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-12-02 08:33:33,730 INFO L202 MainTranslator]: Completed pre-run [2023-12-02 08:33:33,768 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-12-02 08:33:33,795 INFO L206 MainTranslator]: Completed translation [2023-12-02 08:33:33,795 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 08:33:33 WrapperNode [2023-12-02 08:33:33,795 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-12-02 08:33:33,796 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-12-02 08:33:33,796 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-12-02 08:33:33,797 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-12-02 08:33:33,804 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 08:33:33" (1/1) ... [2023-12-02 08:33:33,817 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 08:33:33" (1/1) ... [2023-12-02 08:33:33,836 INFO L138 Inliner]: procedures = 117, calls = 15, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 90 [2023-12-02 08:33:33,837 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-12-02 08:33:33,837 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-12-02 08:33:33,837 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-12-02 08:33:33,838 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-12-02 08:33:33,846 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 08:33:33" (1/1) ... [2023-12-02 08:33:33,847 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 08:33:33" (1/1) ... [2023-12-02 08:33:33,850 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 08:33:33" (1/1) ... [2023-12-02 08:33:33,850 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 08:33:33" (1/1) ... [2023-12-02 08:33:33,857 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 08:33:33" (1/1) ... [2023-12-02 08:33:33,860 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 08:33:33" (1/1) ... [2023-12-02 08:33:33,862 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 08:33:33" (1/1) ... [2023-12-02 08:33:33,863 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 08:33:33" (1/1) ... [2023-12-02 08:33:33,866 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-12-02 08:33:33,867 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-12-02 08:33:33,867 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-12-02 08:33:33,867 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-12-02 08:33:33,868 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 08:33:33" (1/1) ... [2023-12-02 08:33:33,873 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-12-02 08:33:33,885 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 08:33:33,909 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-12-02 08:33:33,912 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-12-02 08:33:33,942 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2023-12-02 08:33:33,942 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2023-12-02 08:33:33,942 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2023-12-02 08:33:33,943 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-12-02 08:33:33,943 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-12-02 08:33:33,943 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-12-02 08:33:34,047 INFO L241 CfgBuilder]: Building ICFG [2023-12-02 08:33:34,048 INFO L267 CfgBuilder]: Building CFG for each procedure with an implementation [2023-12-02 08:33:34,243 INFO L282 CfgBuilder]: Performing block encoding [2023-12-02 08:33:34,316 INFO L304 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-12-02 08:33:34,316 INFO L309 CfgBuilder]: Removed 3 assume(true) statements. [2023-12-02 08:33:34,318 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.12 08:33:34 BoogieIcfgContainer [2023-12-02 08:33:34,318 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-12-02 08:33:34,321 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-12-02 08:33:34,321 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-12-02 08:33:34,324 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-12-02 08:33:34,324 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.12 08:33:33" (1/3) ... [2023-12-02 08:33:34,325 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4a44af65 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.12 08:33:34, skipping insertion in model container [2023-12-02 08:33:34,325 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 08:33:33" (2/3) ... [2023-12-02 08:33:34,325 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4a44af65 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.12 08:33:34, skipping insertion in model container [2023-12-02 08:33:34,326 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.12 08:33:34" (3/3) ... [2023-12-02 08:33:34,327 INFO L112 eAbstractionObserver]: Analyzing ICFG openbsd_cstrspn-alloca-2.i [2023-12-02 08:33:34,342 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-12-02 08:33:34,342 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 13 error locations. [2023-12-02 08:33:34,381 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-12-02 08:33:34,388 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;@2a285402, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-12-02 08:33:34,388 INFO L358 AbstractCegarLoop]: Starting to check reachability of 13 error locations. [2023-12-02 08:33:34,392 INFO L276 IsEmpty]: Start isEmpty. Operand has 29 states, 15 states have (on average 2.2) internal successors, (33), 28 states have internal predecessors, (33), 0 states have call successors, (0), 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 08:33:34,396 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2023-12-02 08:33:34,396 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 08:33:34,397 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1] [2023-12-02 08:33:34,397 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 10 more)] === [2023-12-02 08:33:34,401 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 08:33:34,401 INFO L85 PathProgramCache]: Analyzing trace with hash 138161, now seen corresponding path program 1 times [2023-12-02 08:33:34,408 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 08:33:34,409 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [126895849] [2023-12-02 08:33:34,409 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 08:33:34,409 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 08:33:34,504 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 08:33:34,678 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 08:33:34,679 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 08:33:34,679 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [126895849] [2023-12-02 08:33:34,680 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [126895849] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 08:33:34,680 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 08:33:34,681 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-12-02 08:33:34,682 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1469739255] [2023-12-02 08:33:34,683 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 08:33:34,688 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 08:33:34,688 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 08:33:34,719 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 08:33:34,719 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-12-02 08:33:34,721 INFO L87 Difference]: Start difference. First operand has 29 states, 15 states have (on average 2.2) internal successors, (33), 28 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 3 states, 2 states have (on average 1.5) 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 08:33:34,767 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 08:33:34,767 INFO L93 Difference]: Finished difference Result 27 states and 30 transitions. [2023-12-02 08:33:34,768 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 08:33:34,769 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 1.5) 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 08:33:34,770 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 08:33:34,775 INFO L225 Difference]: With dead ends: 27 [2023-12-02 08:33:34,775 INFO L226 Difference]: Without dead ends: 26 [2023-12-02 08:33:34,776 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 08:33:34,780 INFO L413 NwaCegarLoop]: 13 mSDtfsCounter, 25 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 20 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 25 SdHoareTripleChecker+Valid, 13 SdHoareTripleChecker+Invalid, 21 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 20 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-12-02 08:33:34,781 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [25 Valid, 13 Invalid, 21 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 20 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-12-02 08:33:34,796 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2023-12-02 08:33:34,805 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2023-12-02 08:33:34,806 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26 states, 15 states have (on average 1.9333333333333333) internal successors, (29), 25 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 08:33:34,806 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 29 transitions. [2023-12-02 08:33:34,807 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 29 transitions. Word has length 3 [2023-12-02 08:33:34,807 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 08:33:34,807 INFO L495 AbstractCegarLoop]: Abstraction has 26 states and 29 transitions. [2023-12-02 08:33:34,808 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 1.5) 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 08:33:34,808 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 29 transitions. [2023-12-02 08:33:34,808 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2023-12-02 08:33:34,808 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 08:33:34,808 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1] [2023-12-02 08:33:34,809 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-12-02 08:33:34,809 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 10 more)] === [2023-12-02 08:33:34,810 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 08:33:34,810 INFO L85 PathProgramCache]: Analyzing trace with hash 138162, now seen corresponding path program 1 times [2023-12-02 08:33:34,810 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 08:33:34,810 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [854295061] [2023-12-02 08:33:34,811 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 08:33:34,811 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 08:33:34,836 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 08:33:35,072 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 08:33:35,073 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 08:33:35,073 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [854295061] [2023-12-02 08:33:35,073 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [854295061] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 08:33:35,073 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 08:33:35,073 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-12-02 08:33:35,074 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [878154956] [2023-12-02 08:33:35,074 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 08:33:35,075 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-12-02 08:33:35,075 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 08:33:35,076 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-12-02 08:33:35,076 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-12-02 08:33:35,076 INFO L87 Difference]: Start difference. First operand 26 states and 29 transitions. Second operand has 4 states, 3 states have (on average 1.0) internal successors, (3), 3 states have internal predecessors, (3), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 08:33:35,154 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 08:33:35,155 INFO L93 Difference]: Finished difference Result 28 states and 32 transitions. [2023-12-02 08:33:35,155 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-12-02 08:33:35,155 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 1.0) internal successors, (3), 3 states have internal predecessors, (3), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 3 [2023-12-02 08:33:35,155 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 08:33:35,156 INFO L225 Difference]: With dead ends: 28 [2023-12-02 08:33:35,156 INFO L226 Difference]: Without dead ends: 28 [2023-12-02 08:33:35,157 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2023-12-02 08:33:35,158 INFO L413 NwaCegarLoop]: 19 mSDtfsCounter, 1 mSDsluCounter, 24 mSDsCounter, 0 mSdLazyCounter, 43 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 43 SdHoareTripleChecker+Invalid, 43 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 43 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 08:33:35,159 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1 Valid, 43 Invalid, 43 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 43 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 08:33:35,160 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2023-12-02 08:33:35,162 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2023-12-02 08:33:35,163 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28 states, 17 states have (on average 1.8823529411764706) internal successors, (32), 27 states have internal predecessors, (32), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 08:33:35,163 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 32 transitions. [2023-12-02 08:33:35,164 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 32 transitions. Word has length 3 [2023-12-02 08:33:35,164 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 08:33:35,164 INFO L495 AbstractCegarLoop]: Abstraction has 28 states and 32 transitions. [2023-12-02 08:33:35,164 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 1.0) internal successors, (3), 3 states have internal predecessors, (3), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 08:33:35,164 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 32 transitions. [2023-12-02 08:33:35,165 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5 [2023-12-02 08:33:35,165 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 08:33:35,165 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1] [2023-12-02 08:33:35,165 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2023-12-02 08:33:35,165 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 10 more)] === [2023-12-02 08:33:35,166 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 08:33:35,166 INFO L85 PathProgramCache]: Analyzing trace with hash 4364254, now seen corresponding path program 1 times [2023-12-02 08:33:35,166 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 08:33:35,166 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [458558614] [2023-12-02 08:33:35,166 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 08:33:35,167 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 08:33:35,179 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 08:33:35,223 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 08:33:35,224 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 08:33:35,224 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [458558614] [2023-12-02 08:33:35,224 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [458558614] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 08:33:35,225 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 08:33:35,225 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-12-02 08:33:35,225 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [776644540] [2023-12-02 08:33:35,225 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 08:33:35,226 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 08:33:35,226 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 08:33:35,227 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 08:33:35,227 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-12-02 08:33:35,227 INFO L87 Difference]: Start difference. First operand 28 states and 32 transitions. Second operand has 3 states, 2 states have (on average 2.0) internal successors, (4), 2 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 08:33:35,272 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 08:33:35,272 INFO L93 Difference]: Finished difference Result 26 states and 30 transitions. [2023-12-02 08:33:35,273 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 08:33:35,273 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 2.0) internal successors, (4), 2 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 4 [2023-12-02 08:33:35,273 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 08:33:35,274 INFO L225 Difference]: With dead ends: 26 [2023-12-02 08:33:35,274 INFO L226 Difference]: Without dead ends: 26 [2023-12-02 08:33:35,274 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 08:33:35,276 INFO L413 NwaCegarLoop]: 13 mSDtfsCounter, 22 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 16 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 22 SdHoareTripleChecker+Valid, 13 SdHoareTripleChecker+Invalid, 17 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 16 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-12-02 08:33:35,276 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [22 Valid, 13 Invalid, 17 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 16 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-12-02 08:33:35,277 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2023-12-02 08:33:35,280 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2023-12-02 08:33:35,280 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26 states, 17 states have (on average 1.7647058823529411) internal successors, (30), 25 states have internal predecessors, (30), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 08:33:35,281 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 30 transitions. [2023-12-02 08:33:35,281 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 30 transitions. Word has length 4 [2023-12-02 08:33:35,281 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 08:33:35,281 INFO L495 AbstractCegarLoop]: Abstraction has 26 states and 30 transitions. [2023-12-02 08:33:35,282 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 2.0) internal successors, (4), 2 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 08:33:35,282 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 30 transitions. [2023-12-02 08:33:35,282 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5 [2023-12-02 08:33:35,282 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 08:33:35,282 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1] [2023-12-02 08:33:35,282 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2023-12-02 08:33:35,283 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 10 more)] === [2023-12-02 08:33:35,283 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 08:33:35,283 INFO L85 PathProgramCache]: Analyzing trace with hash 4364255, now seen corresponding path program 1 times [2023-12-02 08:33:35,284 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 08:33:35,284 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1345885771] [2023-12-02 08:33:35,284 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 08:33:35,284 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 08:33:35,297 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 08:33:35,449 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 08:33:35,449 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 08:33:35,449 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1345885771] [2023-12-02 08:33:35,449 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1345885771] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 08:33:35,450 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 08:33:35,450 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-12-02 08:33:35,450 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1100757190] [2023-12-02 08:33:35,450 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 08:33:35,451 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-12-02 08:33:35,451 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 08:33:35,451 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-12-02 08:33:35,452 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2023-12-02 08:33:35,452 INFO L87 Difference]: Start difference. First operand 26 states and 30 transitions. Second operand has 5 states, 4 states have (on average 1.0) internal successors, (4), 4 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 08:33:35,527 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 08:33:35,527 INFO L93 Difference]: Finished difference Result 28 states and 33 transitions. [2023-12-02 08:33:35,527 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-12-02 08:33:35,528 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 1.0) internal successors, (4), 4 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 4 [2023-12-02 08:33:35,528 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 08:33:35,528 INFO L225 Difference]: With dead ends: 28 [2023-12-02 08:33:35,528 INFO L226 Difference]: Without dead ends: 28 [2023-12-02 08:33:35,529 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2023-12-02 08:33:35,530 INFO L413 NwaCegarLoop]: 10 mSDtfsCounter, 28 mSDsluCounter, 20 mSDsCounter, 0 mSdLazyCounter, 50 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 28 SdHoareTripleChecker+Valid, 30 SdHoareTripleChecker+Invalid, 50 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 50 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 08:33:35,531 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [28 Valid, 30 Invalid, 50 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 50 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 08:33:35,532 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2023-12-02 08:33:35,534 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2023-12-02 08:33:35,534 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28 states, 19 states have (on average 1.736842105263158) internal successors, (33), 27 states have internal predecessors, (33), 0 states have call successors, (0), 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 08:33:35,535 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 33 transitions. [2023-12-02 08:33:35,535 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 33 transitions. Word has length 4 [2023-12-02 08:33:35,535 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 08:33:35,536 INFO L495 AbstractCegarLoop]: Abstraction has 28 states and 33 transitions. [2023-12-02 08:33:35,536 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 1.0) internal successors, (4), 4 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 08:33:35,536 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 33 transitions. [2023-12-02 08:33:35,536 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5 [2023-12-02 08:33:35,536 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 08:33:35,536 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1] [2023-12-02 08:33:35,537 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2023-12-02 08:33:35,537 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 10 more)] === [2023-12-02 08:33:35,537 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 08:33:35,538 INFO L85 PathProgramCache]: Analyzing trace with hash 4366373, now seen corresponding path program 1 times [2023-12-02 08:33:35,538 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 08:33:35,538 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [517237466] [2023-12-02 08:33:35,538 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 08:33:35,538 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 08:33:35,553 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 08:33:35,715 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 08:33:35,715 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 08:33:35,715 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [517237466] [2023-12-02 08:33:35,715 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [517237466] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 08:33:35,715 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 08:33:35,716 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-12-02 08:33:35,716 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [94924573] [2023-12-02 08:33:35,716 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 08:33:35,716 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-12-02 08:33:35,716 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 08:33:35,717 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-12-02 08:33:35,717 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2023-12-02 08:33:35,717 INFO L87 Difference]: Start difference. First operand 28 states and 33 transitions. Second operand has 4 states, 3 states have (on average 1.3333333333333333) internal successors, (4), 3 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 08:33:35,750 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 08:33:35,751 INFO L93 Difference]: Finished difference Result 27 states and 32 transitions. [2023-12-02 08:33:35,751 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 08:33:35,751 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 1.3333333333333333) internal successors, (4), 3 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 4 [2023-12-02 08:33:35,752 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 08:33:35,752 INFO L225 Difference]: With dead ends: 27 [2023-12-02 08:33:35,752 INFO L226 Difference]: Without dead ends: 27 [2023-12-02 08:33:35,753 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2023-12-02 08:33:35,754 INFO L413 NwaCegarLoop]: 10 mSDtfsCounter, 23 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 16 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 23 SdHoareTripleChecker+Valid, 10 SdHoareTripleChecker+Invalid, 17 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 16 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-12-02 08:33:35,754 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [23 Valid, 10 Invalid, 17 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 16 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-12-02 08:33:35,755 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2023-12-02 08:33:35,757 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2023-12-02 08:33:35,757 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27 states, 19 states have (on average 1.6842105263157894) internal successors, (32), 26 states have internal predecessors, (32), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 08:33:35,758 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 32 transitions. [2023-12-02 08:33:35,758 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 32 transitions. Word has length 4 [2023-12-02 08:33:35,758 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 08:33:35,758 INFO L495 AbstractCegarLoop]: Abstraction has 27 states and 32 transitions. [2023-12-02 08:33:35,758 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 1.3333333333333333) internal successors, (4), 3 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 08:33:35,758 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 32 transitions. [2023-12-02 08:33:35,759 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6 [2023-12-02 08:33:35,759 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 08:33:35,759 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1] [2023-12-02 08:33:35,759 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2023-12-02 08:33:35,759 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 10 more)] === [2023-12-02 08:33:35,760 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 08:33:35,760 INFO L85 PathProgramCache]: Analyzing trace with hash 132846496, now seen corresponding path program 1 times [2023-12-02 08:33:35,760 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 08:33:35,760 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [125084380] [2023-12-02 08:33:35,760 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 08:33:35,761 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 08:33:35,775 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 08:33:36,018 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 08:33:36,019 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 08:33:36,019 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [125084380] [2023-12-02 08:33:36,019 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [125084380] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 08:33:36,019 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [47976060] [2023-12-02 08:33:36,020 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 08:33:36,020 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 08:33:36,020 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 08:33:36,024 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 08:33:36,028 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-12-02 08:33:36,094 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 08:33:36,096 INFO L262 TraceCheckSpWp]: Trace formula consists of 61 conjuncts, 16 conjunts are in the unsatisfiable core [2023-12-02 08:33:36,112 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 08:33:36,210 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 1 [2023-12-02 08:33:36,215 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-12-02 08:33:36,219 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 5 treesize of output 3 [2023-12-02 08:33:36,367 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 08:33:36,367 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 08:33:36,478 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 08:33:36,479 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [47976060] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 08:33:36,479 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [225105601] [2023-12-02 08:33:36,493 INFO L159 IcfgInterpreter]: Started Sifa with 4 locations of interest [2023-12-02 08:33:36,493 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 08:33:36,496 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 08:33:36,502 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 08:33:36,502 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 08:33:37,102 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 08:33:37,286 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '361#(and (<= 2 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |ULTIMATE.start_main_#t~malloc8#1.offset| 0) (<= 1 |#StackHeapBarrier|) (= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= |ULTIMATE.start_main_#t~nondet11#1| 127) (<= (+ 2 |ULTIMATE.start_main_~i~0#1|) |ULTIMATE.start_main_~length1~0#1|) (<= 0 (+ 128 |ULTIMATE.start_main_#t~nondet11#1|)) (<= 2 |ULTIMATE.start_main_#t~malloc9#1.base|) (= |ULTIMATE.start_main_#t~malloc9#1.offset| 0) (= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= (select |#length| |ULTIMATE.start_main_~nondetString1~0#1.base|) |ULTIMATE.start_main_~i~0#1|) (<= 2 |ULTIMATE.start_main_#t~malloc8#1.base|) (<= 2 |ULTIMATE.start_main_~nondetString1~0#1.base|))' at error location [2023-12-02 08:33:37,286 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 08:33:37,286 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 08:33:37,287 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3, 3] total 9 [2023-12-02 08:33:37,287 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [109830463] [2023-12-02 08:33:37,287 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 08:33:37,287 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2023-12-02 08:33:37,287 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 08:33:37,288 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2023-12-02 08:33:37,288 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=141, Unknown=0, NotChecked=0, Total=182 [2023-12-02 08:33:37,289 INFO L87 Difference]: Start difference. First operand 27 states and 32 transitions. Second operand has 11 states, 10 states have (on average 1.5) internal successors, (15), 10 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 08:33:37,511 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 08:33:37,511 INFO L93 Difference]: Finished difference Result 27 states and 33 transitions. [2023-12-02 08:33:37,513 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-12-02 08:33:37,513 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 10 states have (on average 1.5) internal successors, (15), 10 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 5 [2023-12-02 08:33:37,513 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 08:33:37,514 INFO L225 Difference]: With dead ends: 27 [2023-12-02 08:33:37,514 INFO L226 Difference]: Without dead ends: 27 [2023-12-02 08:33:37,514 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 39 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=76, Invalid=230, Unknown=0, NotChecked=0, Total=306 [2023-12-02 08:33:37,515 INFO L413 NwaCegarLoop]: 15 mSDtfsCounter, 2 mSDsluCounter, 40 mSDsCounter, 0 mSdLazyCounter, 86 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 55 SdHoareTripleChecker+Invalid, 89 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 86 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 08:33:37,516 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [2 Valid, 55 Invalid, 89 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 86 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 08:33:37,516 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2023-12-02 08:33:37,518 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 24. [2023-12-02 08:33:37,518 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24 states, 17 states have (on average 1.6470588235294117) internal successors, (28), 23 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 08:33:37,519 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 28 transitions. [2023-12-02 08:33:37,519 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 28 transitions. Word has length 5 [2023-12-02 08:33:37,519 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 08:33:37,519 INFO L495 AbstractCegarLoop]: Abstraction has 24 states and 28 transitions. [2023-12-02 08:33:37,520 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 10 states have (on average 1.5) internal successors, (15), 10 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 08:33:37,520 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 28 transitions. [2023-12-02 08:33:37,520 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6 [2023-12-02 08:33:37,520 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 08:33:37,520 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1] [2023-12-02 08:33:37,529 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2023-12-02 08:33:37,720 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 08:33:37,721 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr7REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 10 more)] === [2023-12-02 08:33:37,721 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 08:33:37,721 INFO L85 PathProgramCache]: Analyzing trace with hash 135357558, now seen corresponding path program 1 times [2023-12-02 08:33:37,721 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 08:33:37,722 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [965911732] [2023-12-02 08:33:37,722 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 08:33:37,722 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 08:33:37,737 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 08:33:37,842 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 08:33:37,843 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 08:33:37,843 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [965911732] [2023-12-02 08:33:37,843 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [965911732] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 08:33:37,843 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 08:33:37,843 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-12-02 08:33:37,843 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1897859308] [2023-12-02 08:33:37,843 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 08:33:37,844 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 08:33:37,844 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 08:33:37,844 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 08:33:37,844 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-12-02 08:33:37,845 INFO L87 Difference]: Start difference. First operand 24 states and 28 transitions. Second operand has 3 states, 2 states have (on average 2.5) internal successors, (5), 2 states have internal predecessors, (5), 0 states have call successors, (0), 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 08:33:37,872 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 08:33:37,872 INFO L93 Difference]: Finished difference Result 23 states and 27 transitions. [2023-12-02 08:33:37,872 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 08:33:37,872 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 2.5) internal successors, (5), 2 states have internal predecessors, (5), 0 states have call successors, (0), 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 5 [2023-12-02 08:33:37,873 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 08:33:37,873 INFO L225 Difference]: With dead ends: 23 [2023-12-02 08:33:37,873 INFO L226 Difference]: Without dead ends: 23 [2023-12-02 08:33:37,873 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 08:33:37,874 INFO L413 NwaCegarLoop]: 10 mSDtfsCounter, 20 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 14 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 20 SdHoareTripleChecker+Valid, 10 SdHoareTripleChecker+Invalid, 14 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 14 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-12-02 08:33:37,874 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [20 Valid, 10 Invalid, 14 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 14 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-12-02 08:33:37,875 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2023-12-02 08:33:37,876 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2023-12-02 08:33:37,877 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 23 states, 17 states have (on average 1.588235294117647) internal successors, (27), 22 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 08:33:37,877 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 27 transitions. [2023-12-02 08:33:37,877 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 27 transitions. Word has length 5 [2023-12-02 08:33:37,877 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 08:33:37,878 INFO L495 AbstractCegarLoop]: Abstraction has 23 states and 27 transitions. [2023-12-02 08:33:37,878 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 2.5) internal successors, (5), 2 states have internal predecessors, (5), 0 states have call successors, (0), 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 08:33:37,878 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 27 transitions. [2023-12-02 08:33:37,878 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2023-12-02 08:33:37,878 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 08:33:37,878 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1] [2023-12-02 08:33:37,878 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2023-12-02 08:33:37,879 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 10 more)] === [2023-12-02 08:33:37,879 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 08:33:37,879 INFO L85 PathProgramCache]: Analyzing trace with hash -100863110, now seen corresponding path program 1 times [2023-12-02 08:33:37,879 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 08:33:37,879 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1737746891] [2023-12-02 08:33:37,879 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 08:33:37,880 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 08:33:37,891 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 08:33:38,102 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 08:33:38,103 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 08:33:38,103 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1737746891] [2023-12-02 08:33:38,103 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1737746891] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 08:33:38,103 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [429091430] [2023-12-02 08:33:38,103 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 08:33:38,103 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 08:33:38,103 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 08:33:38,104 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 08:33:38,107 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-12-02 08:33:38,166 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 08:33:38,167 INFO L262 TraceCheckSpWp]: Trace formula consists of 64 conjuncts, 17 conjunts are in the unsatisfiable core [2023-12-02 08:33:38,169 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 08:33:38,187 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 7 [2023-12-02 08:33:38,195 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 1 [2023-12-02 08:33:38,390 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 08:33:38,390 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 08:33:38,534 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 08:33:38,534 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [429091430] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 08:33:38,535 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [19561192] [2023-12-02 08:33:38,537 INFO L159 IcfgInterpreter]: Started Sifa with 5 locations of interest [2023-12-02 08:33:38,537 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 08:33:38,537 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 08:33:38,537 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 08:33:38,537 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 08:33:39,063 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 08:33:39,454 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '516#(and (<= 2 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |ULTIMATE.start_main_#t~malloc8#1.offset| 0) (<= 1 |#StackHeapBarrier|) (= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= |ULTIMATE.start_main_#t~nondet13#1| 127) (<= |ULTIMATE.start_main_~length1~0#1| 1) (<= 2 |ULTIMATE.start_main_#t~malloc9#1.base|) (= |ULTIMATE.start_main_#t~malloc9#1.offset| 0) (= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 0 (+ 128 |ULTIMATE.start_main_#t~nondet13#1|)) (<= 2 |ULTIMATE.start_main_#t~malloc8#1.base|) (<= (select |#length| |ULTIMATE.start_main_~nondetString2~0#1.base|) |ULTIMATE.start_main_~i~1#1|) (<= 2 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 2 |ULTIMATE.start_main_~length2~0#1|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647))' at error location [2023-12-02 08:33:39,454 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 08:33:39,454 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 08:33:39,454 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 12 [2023-12-02 08:33:39,455 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1784332124] [2023-12-02 08:33:39,455 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 08:33:39,455 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2023-12-02 08:33:39,455 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 08:33:39,456 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2023-12-02 08:33:39,456 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=238, Unknown=0, NotChecked=0, Total=306 [2023-12-02 08:33:39,456 INFO L87 Difference]: Start difference. First operand 23 states and 27 transitions. Second operand has 14 states, 13 states have (on average 1.3846153846153846) internal successors, (18), 13 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 08:33:39,644 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 08:33:39,645 INFO L93 Difference]: Finished difference Result 23 states and 28 transitions. [2023-12-02 08:33:39,648 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2023-12-02 08:33:39,648 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 13 states have (on average 1.3846153846153846) internal successors, (18), 13 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 6 [2023-12-02 08:33:39,649 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 08:33:39,649 INFO L225 Difference]: With dead ends: 23 [2023-12-02 08:33:39,649 INFO L226 Difference]: Without dead ends: 23 [2023-12-02 08:33:39,649 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 87 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=103, Invalid=317, Unknown=0, NotChecked=0, Total=420 [2023-12-02 08:33:39,650 INFO L413 NwaCegarLoop]: 10 mSDtfsCounter, 41 mSDsluCounter, 30 mSDsCounter, 0 mSdLazyCounter, 67 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 41 SdHoareTripleChecker+Valid, 40 SdHoareTripleChecker+Invalid, 69 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 67 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 08:33:39,651 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [41 Valid, 40 Invalid, 69 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 67 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 08:33:39,651 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2023-12-02 08:33:39,652 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 20. [2023-12-02 08:33:39,653 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20 states, 15 states have (on average 1.5333333333333334) internal successors, (23), 19 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 08:33:39,653 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 23 transitions. [2023-12-02 08:33:39,653 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 23 transitions. Word has length 6 [2023-12-02 08:33:39,653 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 08:33:39,653 INFO L495 AbstractCegarLoop]: Abstraction has 20 states and 23 transitions. [2023-12-02 08:33:39,653 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 13 states have (on average 1.3846153846153846) internal successors, (18), 13 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 08:33:39,654 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 23 transitions. [2023-12-02 08:33:39,654 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2023-12-02 08:33:39,654 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 08:33:39,654 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2023-12-02 08:33:39,659 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Ended with exit code 0 [2023-12-02 08:33:39,859 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 08:33:39,860 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr8REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 10 more)] === [2023-12-02 08:33:39,860 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 08:33:39,860 INFO L85 PathProgramCache]: Analyzing trace with hash 1229639525, now seen corresponding path program 1 times [2023-12-02 08:33:39,860 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 08:33:39,861 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1294854916] [2023-12-02 08:33:39,861 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 08:33:39,861 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 08:33:39,870 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 08:33:39,920 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 08:33:39,921 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 08:33:39,921 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1294854916] [2023-12-02 08:33:39,921 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1294854916] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 08:33:39,921 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 08:33:39,921 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-12-02 08:33:39,921 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1874801188] [2023-12-02 08:33:39,921 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 08:33:39,922 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-12-02 08:33:39,922 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 08:33:39,922 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-12-02 08:33:39,922 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2023-12-02 08:33:39,923 INFO L87 Difference]: Start difference. First operand 20 states and 23 transitions. Second operand has 5 states, 4 states have (on average 1.75) internal successors, (7), 5 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 08:33:39,967 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 08:33:39,968 INFO L93 Difference]: Finished difference Result 19 states and 22 transitions. [2023-12-02 08:33:39,968 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-12-02 08:33:39,968 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 1.75) internal successors, (7), 5 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 08:33:39,968 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 08:33:39,968 INFO L225 Difference]: With dead ends: 19 [2023-12-02 08:33:39,969 INFO L226 Difference]: Without dead ends: 19 [2023-12-02 08:33:39,969 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 08:33:39,970 INFO L413 NwaCegarLoop]: 9 mSDtfsCounter, 29 mSDsluCounter, 10 mSDsCounter, 0 mSdLazyCounter, 35 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 29 SdHoareTripleChecker+Valid, 19 SdHoareTripleChecker+Invalid, 37 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 35 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-12-02 08:33:39,970 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [29 Valid, 19 Invalid, 37 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 35 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-12-02 08:33:39,970 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2023-12-02 08:33:39,972 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2023-12-02 08:33:39,972 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19 states, 15 states have (on average 1.4666666666666666) internal successors, (22), 18 states have internal predecessors, (22), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 08:33:39,972 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 22 transitions. [2023-12-02 08:33:39,972 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 22 transitions. Word has length 7 [2023-12-02 08:33:39,973 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 08:33:39,973 INFO L495 AbstractCegarLoop]: Abstraction has 19 states and 22 transitions. [2023-12-02 08:33:39,973 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 1.75) internal successors, (7), 5 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 08:33:39,973 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 22 transitions. [2023-12-02 08:33:39,973 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2023-12-02 08:33:39,973 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 08:33:39,973 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2023-12-02 08:33:39,973 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2023-12-02 08:33:39,974 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 10 more)] === [2023-12-02 08:33:39,974 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 08:33:39,974 INFO L85 PathProgramCache]: Analyzing trace with hash 1229639526, now seen corresponding path program 1 times [2023-12-02 08:33:39,974 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 08:33:39,974 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [172353884] [2023-12-02 08:33:39,974 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 08:33:39,975 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 08:33:39,986 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 08:33:40,149 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 08:33:40,149 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 08:33:40,149 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [172353884] [2023-12-02 08:33:40,150 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [172353884] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 08:33:40,150 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 08:33:40,150 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2023-12-02 08:33:40,150 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1047084763] [2023-12-02 08:33:40,150 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 08:33:40,150 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-12-02 08:33:40,150 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 08:33:40,151 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-12-02 08:33:40,151 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2023-12-02 08:33:40,151 INFO L87 Difference]: Start difference. First operand 19 states and 22 transitions. Second operand has 7 states, 6 states have (on average 1.1666666666666667) internal successors, (7), 6 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 08:33:40,353 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 08:33:40,353 INFO L93 Difference]: Finished difference Result 41 states and 47 transitions. [2023-12-02 08:33:40,354 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2023-12-02 08:33:40,354 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 1.1666666666666667) internal successors, (7), 6 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 08:33:40,354 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 08:33:40,355 INFO L225 Difference]: With dead ends: 41 [2023-12-02 08:33:40,355 INFO L226 Difference]: Without dead ends: 41 [2023-12-02 08:33:40,355 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=54, Invalid=128, Unknown=0, NotChecked=0, Total=182 [2023-12-02 08:33:40,356 INFO L413 NwaCegarLoop]: 8 mSDtfsCounter, 81 mSDsluCounter, 32 mSDsCounter, 0 mSdLazyCounter, 68 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 81 SdHoareTripleChecker+Valid, 40 SdHoareTripleChecker+Invalid, 70 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 68 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 08:33:40,356 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [81 Valid, 40 Invalid, 70 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 68 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 08:33:40,357 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2023-12-02 08:33:40,358 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 21. [2023-12-02 08:33:40,358 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 21 states, 17 states have (on average 1.411764705882353) internal successors, (24), 20 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 08:33:40,359 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 24 transitions. [2023-12-02 08:33:40,359 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 24 transitions. Word has length 7 [2023-12-02 08:33:40,359 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 08:33:40,359 INFO L495 AbstractCegarLoop]: Abstraction has 21 states and 24 transitions. [2023-12-02 08:33:40,359 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 6 states have (on average 1.1666666666666667) internal successors, (7), 6 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 08:33:40,359 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 24 transitions. [2023-12-02 08:33:40,360 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2023-12-02 08:33:40,360 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 08:33:40,360 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 08:33:40,360 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2023-12-02 08:33:40,360 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr10REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 10 more)] === [2023-12-02 08:33:40,360 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 08:33:40,361 INFO L85 PathProgramCache]: Analyzing trace with hash 567611977, now seen corresponding path program 1 times [2023-12-02 08:33:40,361 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 08:33:40,361 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1817685428] [2023-12-02 08:33:40,361 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 08:33:40,361 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 08:33:40,371 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 08:33:40,415 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 08:33:40,416 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 08:33:40,416 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1817685428] [2023-12-02 08:33:40,416 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1817685428] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 08:33:40,416 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 08:33:40,416 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-12-02 08:33:40,416 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1768951913] [2023-12-02 08:33:40,416 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 08:33:40,417 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-12-02 08:33:40,417 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 08:33:40,417 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-12-02 08:33:40,417 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2023-12-02 08:33:40,417 INFO L87 Difference]: Start difference. First operand 21 states and 24 transitions. Second operand has 5 states, 4 states have (on average 2.25) internal successors, (9), 5 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 08:33:40,463 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 08:33:40,463 INFO L93 Difference]: Finished difference Result 20 states and 23 transitions. [2023-12-02 08:33:40,463 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-12-02 08:33:40,464 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 2.25) internal successors, (9), 5 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 08:33:40,464 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 08:33:40,464 INFO L225 Difference]: With dead ends: 20 [2023-12-02 08:33:40,464 INFO L226 Difference]: Without dead ends: 20 [2023-12-02 08:33:40,464 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 08:33:40,465 INFO L413 NwaCegarLoop]: 11 mSDtfsCounter, 19 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 42 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 19 SdHoareTripleChecker+Valid, 23 SdHoareTripleChecker+Invalid, 43 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 42 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-12-02 08:33:40,465 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [19 Valid, 23 Invalid, 43 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 42 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-12-02 08:33:40,466 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2023-12-02 08:33:40,467 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2023-12-02 08:33:40,467 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20 states, 17 states have (on average 1.3529411764705883) internal successors, (23), 19 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 08:33:40,467 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 23 transitions. [2023-12-02 08:33:40,468 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 23 transitions. Word has length 9 [2023-12-02 08:33:40,468 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 08:33:40,468 INFO L495 AbstractCegarLoop]: Abstraction has 20 states and 23 transitions. [2023-12-02 08:33:40,468 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 2.25) internal successors, (9), 5 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 08:33:40,468 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 23 transitions. [2023-12-02 08:33:40,468 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2023-12-02 08:33:40,468 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 08:33:40,468 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 08:33:40,469 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2023-12-02 08:33:40,469 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 10 more)] === [2023-12-02 08:33:40,469 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 08:33:40,469 INFO L85 PathProgramCache]: Analyzing trace with hash 567611978, now seen corresponding path program 1 times [2023-12-02 08:33:40,469 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 08:33:40,469 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [419616953] [2023-12-02 08:33:40,470 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 08:33:40,470 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 08:33:40,482 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 08:33:40,618 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 08:33:40,618 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 08:33:40,619 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [419616953] [2023-12-02 08:33:40,619 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [419616953] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 08:33:40,619 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 08:33:40,619 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-12-02 08:33:40,619 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1460580561] [2023-12-02 08:33:40,619 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 08:33:40,619 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2023-12-02 08:33:40,620 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 08:33:40,620 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2023-12-02 08:33:40,620 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-12-02 08:33:40,620 INFO L87 Difference]: Start difference. First operand 20 states and 23 transitions. Second operand has 6 states, 5 states have (on average 1.8) internal successors, (9), 5 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 08:33:40,714 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 08:33:40,714 INFO L93 Difference]: Finished difference Result 23 states and 27 transitions. [2023-12-02 08:33:40,714 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-12-02 08:33:40,715 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 1.8) internal successors, (9), 5 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 08:33:40,715 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 08:33:40,715 INFO L225 Difference]: With dead ends: 23 [2023-12-02 08:33:40,715 INFO L226 Difference]: Without dead ends: 23 [2023-12-02 08:33:40,715 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=25, Invalid=47, Unknown=0, NotChecked=0, Total=72 [2023-12-02 08:33:40,716 INFO L413 NwaCegarLoop]: 7 mSDtfsCounter, 35 mSDsluCounter, 14 mSDsCounter, 0 mSdLazyCounter, 51 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 35 SdHoareTripleChecker+Valid, 21 SdHoareTripleChecker+Invalid, 51 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 51 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-12-02 08:33:40,716 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [35 Valid, 21 Invalid, 51 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 51 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-12-02 08:33:40,717 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2023-12-02 08:33:40,718 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 22. [2023-12-02 08:33:40,718 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22 states, 19 states have (on average 1.3157894736842106) internal successors, (25), 21 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 08:33:40,718 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 25 transitions. [2023-12-02 08:33:40,719 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 25 transitions. Word has length 9 [2023-12-02 08:33:40,719 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 08:33:40,719 INFO L495 AbstractCegarLoop]: Abstraction has 22 states and 25 transitions. [2023-12-02 08:33:40,719 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 1.8) internal successors, (9), 5 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 08:33:40,719 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 25 transitions. [2023-12-02 08:33:40,719 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2023-12-02 08:33:40,719 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 08:33:40,720 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 08:33:40,720 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2023-12-02 08:33:40,720 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr12ASSERT_VIOLATIONMEMORY_LEAK === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 10 more)] === [2023-12-02 08:33:40,720 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 08:33:40,720 INFO L85 PathProgramCache]: Analyzing trace with hash 443101753, now seen corresponding path program 1 times [2023-12-02 08:33:40,720 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 08:33:40,720 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [662322389] [2023-12-02 08:33:40,721 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 08:33:40,721 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 08:33:40,737 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 08:33:40,861 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 08:33:40,862 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 08:33:40,862 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [662322389] [2023-12-02 08:33:40,862 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [662322389] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 08:33:40,862 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 08:33:40,862 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-12-02 08:33:40,862 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [199057318] [2023-12-02 08:33:40,862 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 08:33:40,863 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-12-02 08:33:40,863 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 08:33:40,863 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-12-02 08:33:40,863 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-12-02 08:33:40,863 INFO L87 Difference]: Start difference. First operand 22 states and 25 transitions. Second operand has 4 states, 3 states have (on average 4.0) internal successors, (12), 3 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 08:33:40,884 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 08:33:40,885 INFO L93 Difference]: Finished difference Result 21 states and 24 transitions. [2023-12-02 08:33:40,885 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-12-02 08:33:40,885 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 4.0) internal successors, (12), 3 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 12 [2023-12-02 08:33:40,885 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 08:33:40,886 INFO L225 Difference]: With dead ends: 21 [2023-12-02 08:33:40,886 INFO L226 Difference]: Without dead ends: 19 [2023-12-02 08:33:40,886 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 08:33:40,887 INFO L413 NwaCegarLoop]: 10 mSDtfsCounter, 9 mSDsluCounter, 10 mSDsCounter, 0 mSdLazyCounter, 20 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 9 SdHoareTripleChecker+Valid, 20 SdHoareTripleChecker+Invalid, 20 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 20 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-12-02 08:33:40,887 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [9 Valid, 20 Invalid, 20 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 20 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-12-02 08:33:40,888 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2023-12-02 08:33:40,889 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2023-12-02 08:33:40,889 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19 states, 17 states have (on average 1.2941176470588236) internal successors, (22), 18 states have internal predecessors, (22), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 08:33:40,889 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 22 transitions. [2023-12-02 08:33:40,889 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 22 transitions. Word has length 12 [2023-12-02 08:33:40,889 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 08:33:40,889 INFO L495 AbstractCegarLoop]: Abstraction has 19 states and 22 transitions. [2023-12-02 08:33:40,890 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 4.0) internal successors, (12), 3 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 08:33:40,890 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 22 transitions. [2023-12-02 08:33:40,890 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2023-12-02 08:33:40,890 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 08:33:40,890 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 08:33:40,890 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2023-12-02 08:33:40,891 INFO L420 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 10 more)] === [2023-12-02 08:33:40,891 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 08:33:40,891 INFO L85 PathProgramCache]: Analyzing trace with hash 851289036, now seen corresponding path program 1 times [2023-12-02 08:33:40,891 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 08:33:40,891 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [515695079] [2023-12-02 08:33:40,891 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 08:33:40,892 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 08:33:40,909 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 08:33:41,125 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 08:33:41,125 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 08:33:41,125 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [515695079] [2023-12-02 08:33:41,125 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [515695079] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 08:33:41,125 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 08:33:41,125 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2023-12-02 08:33:41,126 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [224833760] [2023-12-02 08:33:41,126 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 08:33:41,126 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2023-12-02 08:33:41,126 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 08:33:41,126 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2023-12-02 08:33:41,127 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=57, Unknown=0, NotChecked=0, Total=72 [2023-12-02 08:33:41,127 INFO L87 Difference]: Start difference. First operand 19 states and 22 transitions. Second operand has 9 states, 9 states have (on average 1.4444444444444444) internal successors, (13), 8 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 08:33:41,284 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 08:33:41,284 INFO L93 Difference]: Finished difference Result 34 states and 39 transitions. [2023-12-02 08:33:41,285 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2023-12-02 08:33:41,285 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 1.4444444444444444) internal successors, (13), 8 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 13 [2023-12-02 08:33:41,285 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 08:33:41,285 INFO L225 Difference]: With dead ends: 34 [2023-12-02 08:33:41,285 INFO L226 Difference]: Without dead ends: 34 [2023-12-02 08:33:41,286 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=45, Invalid=137, Unknown=0, NotChecked=0, Total=182 [2023-12-02 08:33:41,286 INFO L413 NwaCegarLoop]: 7 mSDtfsCounter, 27 mSDsluCounter, 47 mSDsCounter, 0 mSdLazyCounter, 102 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 27 SdHoareTripleChecker+Valid, 54 SdHoareTripleChecker+Invalid, 104 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 102 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 08:33:41,287 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [27 Valid, 54 Invalid, 104 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 102 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 08:33:41,287 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2023-12-02 08:33:41,289 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 32. [2023-12-02 08:33:41,289 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 32 states, 30 states have (on average 1.2666666666666666) internal successors, (38), 31 states have internal predecessors, (38), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 08:33:41,290 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 38 transitions. [2023-12-02 08:33:41,290 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 38 transitions. Word has length 13 [2023-12-02 08:33:41,290 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 08:33:41,290 INFO L495 AbstractCegarLoop]: Abstraction has 32 states and 38 transitions. [2023-12-02 08:33:41,290 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 1.4444444444444444) internal successors, (13), 8 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 08:33:41,290 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 38 transitions. [2023-12-02 08:33:41,291 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2023-12-02 08:33:41,291 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 08:33:41,291 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 08:33:41,291 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2023-12-02 08:33:41,291 INFO L420 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 10 more)] === [2023-12-02 08:33:41,292 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 08:33:41,292 INFO L85 PathProgramCache]: Analyzing trace with hash 851291214, now seen corresponding path program 1 times [2023-12-02 08:33:41,292 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 08:33:41,292 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1183418334] [2023-12-02 08:33:41,292 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 08:33:41,292 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 08:33:41,317 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 08:33:41,540 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 08:33:41,540 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 08:33:41,540 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1183418334] [2023-12-02 08:33:41,540 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1183418334] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 08:33:41,541 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 08:33:41,541 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2023-12-02 08:33:41,541 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [465102042] [2023-12-02 08:33:41,541 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 08:33:41,541 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2023-12-02 08:33:41,541 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 08:33:41,542 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2023-12-02 08:33:41,542 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=54, Unknown=0, NotChecked=0, Total=72 [2023-12-02 08:33:41,542 INFO L87 Difference]: Start difference. First operand 32 states and 38 transitions. Second operand has 9 states, 9 states have (on average 1.4444444444444444) internal successors, (13), 8 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 08:33:41,662 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 08:33:41,662 INFO L93 Difference]: Finished difference Result 50 states and 56 transitions. [2023-12-02 08:33:41,662 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2023-12-02 08:33:41,663 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 1.4444444444444444) internal successors, (13), 8 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 13 [2023-12-02 08:33:41,663 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 08:33:41,663 INFO L225 Difference]: With dead ends: 50 [2023-12-02 08:33:41,663 INFO L226 Difference]: Without dead ends: 36 [2023-12-02 08:33:41,663 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=50, Invalid=106, Unknown=0, NotChecked=0, Total=156 [2023-12-02 08:33:41,664 INFO L413 NwaCegarLoop]: 8 mSDtfsCounter, 33 mSDsluCounter, 43 mSDsCounter, 0 mSdLazyCounter, 74 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 33 SdHoareTripleChecker+Valid, 51 SdHoareTripleChecker+Invalid, 74 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 74 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 08:33:41,664 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [33 Valid, 51 Invalid, 74 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 74 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 08:33:41,665 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2023-12-02 08:33:41,666 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 34. [2023-12-02 08:33:41,667 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 34 states, 32 states have (on average 1.25) internal successors, (40), 33 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 08:33:41,667 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 40 transitions. [2023-12-02 08:33:41,667 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 40 transitions. Word has length 13 [2023-12-02 08:33:41,667 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 08:33:41,667 INFO L495 AbstractCegarLoop]: Abstraction has 34 states and 40 transitions. [2023-12-02 08:33:41,667 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 1.4444444444444444) internal successors, (13), 8 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 08:33:41,668 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 40 transitions. [2023-12-02 08:33:41,668 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2023-12-02 08:33:41,668 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 08:33:41,668 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 08:33:41,668 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2023-12-02 08:33:41,669 INFO L420 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 10 more)] === [2023-12-02 08:33:41,669 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 08:33:41,669 INFO L85 PathProgramCache]: Analyzing trace with hash -1913573613, now seen corresponding path program 1 times [2023-12-02 08:33:41,669 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 08:33:41,669 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1371272211] [2023-12-02 08:33:41,669 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 08:33:41,669 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 08:33:41,682 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 08:33:41,906 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 08:33:41,906 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 08:33:41,906 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1371272211] [2023-12-02 08:33:41,906 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1371272211] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 08:33:41,906 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [207613005] [2023-12-02 08:33:41,907 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 08:33:41,907 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 08:33:41,907 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 08:33:41,909 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 08:33:41,916 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-12-02 08:33:41,988 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 08:33:41,989 INFO L262 TraceCheckSpWp]: Trace formula consists of 142 conjuncts, 27 conjunts are in the unsatisfiable core [2023-12-02 08:33:41,991 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 08:33:42,094 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 08:33:42,094 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 08:33:42,241 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 5 treesize of output 3 [2023-12-02 08:33:42,265 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 08:33:42,266 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [207613005] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 08:33:42,266 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1966678816] [2023-12-02 08:33:42,269 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2023-12-02 08:33:42,269 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 08:33:42,269 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 08:33:42,269 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 08:33:42,270 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 08:33:43,357 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 08:33:44,638 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1140#(and (<= 2 |ULTIMATE.start_cstrspn_~s2#1.base|) (= |ULTIMATE.start_cstrspn_#in~s2#1.offset| 0) (<= 2 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |ULTIMATE.start_main_#t~malloc8#1.offset| 0) (<= 0 |ULTIMATE.start_cstrspn_#t~post4#1.offset|) (<= 1 |#StackHeapBarrier|) (= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (= |ULTIMATE.start_main_~length1~0#1| 1) (= |ULTIMATE.start_cstrspn_~p~0#1.offset| 1) (= |ULTIMATE.start_cstrspn_~spanp~0#1.base| |ULTIMATE.start_cstrspn_#t~post4#1.base|) (<= 2 |ULTIMATE.start_main_#t~malloc9#1.base|) (<= 2 |ULTIMATE.start_cstrspn_#in~s1#1.base|) (= |ULTIMATE.start_cstrspn_#in~s1#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc9#1.offset| 0) (= 0 |ULTIMATE.start_cstrspn_~s2#1.offset|) (= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 2 |ULTIMATE.start_cstrspn_~p~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 2 |ULTIMATE.start_main_#t~malloc8#1.base|) (<= 2 |ULTIMATE.start_cstrspn_#in~s2#1.base|) (<= (select |#length| |ULTIMATE.start_cstrspn_#t~post4#1.base|) |ULTIMATE.start_cstrspn_#t~post4#1.offset|) (<= 2 |ULTIMATE.start_cstrspn_~s1#1.base|) (<= 2 |ULTIMATE.start_main_~nondetString1~0#1.base|) (= |ULTIMATE.start_cstrspn_~s1#1.offset| 0) (= (+ |ULTIMATE.start_cstrspn_#t~post4#1.offset| 1) |ULTIMATE.start_cstrspn_~spanp~0#1.offset|) (<= 2 |ULTIMATE.start_cstrspn_#t~post4#1.base|))' at error location [2023-12-02 08:33:44,639 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 08:33:44,639 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 08:33:44,639 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8, 8] total 20 [2023-12-02 08:33:44,639 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [971587188] [2023-12-02 08:33:44,639 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 08:33:44,639 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 21 states [2023-12-02 08:33:44,640 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 08:33:44,640 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2023-12-02 08:33:44,641 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=125, Invalid=931, Unknown=0, NotChecked=0, Total=1056 [2023-12-02 08:33:44,641 INFO L87 Difference]: Start difference. First operand 34 states and 40 transitions. Second operand has 21 states, 20 states have (on average 1.75) internal successors, (35), 21 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 08:33:44,884 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 08:33:44,884 INFO L93 Difference]: Finished difference Result 49 states and 56 transitions. [2023-12-02 08:33:44,885 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2023-12-02 08:33:44,885 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 20 states have (on average 1.75) internal successors, (35), 21 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 15 [2023-12-02 08:33:44,885 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 08:33:44,885 INFO L225 Difference]: With dead ends: 49 [2023-12-02 08:33:44,885 INFO L226 Difference]: Without dead ends: 49 [2023-12-02 08:33:44,886 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 59 GetRequests, 19 SyntacticMatches, 2 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 395 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=206, Invalid=1354, Unknown=0, NotChecked=0, Total=1560 [2023-12-02 08:33:44,887 INFO L413 NwaCegarLoop]: 8 mSDtfsCounter, 88 mSDsluCounter, 50 mSDsCounter, 0 mSdLazyCounter, 155 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 88 SdHoareTripleChecker+Valid, 58 SdHoareTripleChecker+Invalid, 158 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 155 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 08:33:44,888 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [88 Valid, 58 Invalid, 158 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 155 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 08:33:44,888 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2023-12-02 08:33:44,890 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 42. [2023-12-02 08:33:44,891 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 42 states, 40 states have (on average 1.225) internal successors, (49), 41 states have internal predecessors, (49), 0 states have call successors, (0), 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 08:33:44,891 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 49 transitions. [2023-12-02 08:33:44,891 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 49 transitions. Word has length 15 [2023-12-02 08:33:44,892 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 08:33:44,892 INFO L495 AbstractCegarLoop]: Abstraction has 42 states and 49 transitions. [2023-12-02 08:33:44,892 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 21 states, 20 states have (on average 1.75) internal successors, (35), 21 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 08:33:44,892 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 49 transitions. [2023-12-02 08:33:44,893 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2023-12-02 08:33:44,893 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 08:33:44,893 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 08:33:44,898 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Ended with exit code 0 [2023-12-02 08:33:45,096 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2023-12-02 08:33:45,096 INFO L420 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 10 more)] === [2023-12-02 08:33:45,097 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 08:33:45,097 INFO L85 PathProgramCache]: Analyzing trace with hash 586131839, now seen corresponding path program 1 times [2023-12-02 08:33:45,097 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 08:33:45,097 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [113960536] [2023-12-02 08:33:45,097 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 08:33:45,097 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 08:33:45,109 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 08:33:45,332 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 08:33:45,332 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 08:33:45,332 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [113960536] [2023-12-02 08:33:45,332 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [113960536] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 08:33:45,332 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [421274929] [2023-12-02 08:33:45,332 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 08:33:45,333 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 08:33:45,333 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 08:33:45,334 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 08:33:45,336 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-12-02 08:33:45,406 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 08:33:45,407 INFO L262 TraceCheckSpWp]: Trace formula consists of 156 conjuncts, 27 conjunts are in the unsatisfiable core [2023-12-02 08:33:45,409 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 08:33:45,485 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 08:33:45,485 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 08:33:45,605 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 5 treesize of output 3 [2023-12-02 08:33:45,623 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 08:33:45,623 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [421274929] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 08:33:45,623 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1014895897] [2023-12-02 08:33:45,625 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2023-12-02 08:33:45,625 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 08:33:45,626 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 08:33:45,626 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 08:33:45,626 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 08:33:46,628 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 08:33:47,189 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1370#(or (< (select |#length| |ULTIMATE.start_cstrspn_#t~post2#1.base|) (+ |ULTIMATE.start_cstrspn_#t~post2#1.offset| 1)) (< |ULTIMATE.start_cstrspn_#t~post2#1.offset| 0))' at error location [2023-12-02 08:33:47,189 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 08:33:47,190 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 08:33:47,190 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7, 7] total 15 [2023-12-02 08:33:47,190 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [579037999] [2023-12-02 08:33:47,190 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 08:33:47,190 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2023-12-02 08:33:47,190 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 08:33:47,191 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2023-12-02 08:33:47,191 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=71, Invalid=685, Unknown=0, NotChecked=0, Total=756 [2023-12-02 08:33:47,191 INFO L87 Difference]: Start difference. First operand 42 states and 49 transitions. Second operand has 17 states, 16 states have (on average 2.0) internal successors, (32), 16 states have internal predecessors, (32), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 08:33:47,445 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 08:33:47,445 INFO L93 Difference]: Finished difference Result 57 states and 65 transitions. [2023-12-02 08:33:47,446 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2023-12-02 08:33:47,446 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 16 states have (on average 2.0) internal successors, (32), 16 states have internal predecessors, (32), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 17 [2023-12-02 08:33:47,446 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 08:33:47,446 INFO L225 Difference]: With dead ends: 57 [2023-12-02 08:33:47,446 INFO L226 Difference]: Without dead ends: 57 [2023-12-02 08:33:47,447 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 63 GetRequests, 29 SyntacticMatches, 2 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 200 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=116, Invalid=1006, Unknown=0, NotChecked=0, Total=1122 [2023-12-02 08:33:47,448 INFO L413 NwaCegarLoop]: 12 mSDtfsCounter, 46 mSDsluCounter, 100 mSDsCounter, 0 mSdLazyCounter, 247 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 46 SdHoareTripleChecker+Valid, 112 SdHoareTripleChecker+Invalid, 249 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 247 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 08:33:47,448 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [46 Valid, 112 Invalid, 249 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 247 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 08:33:47,448 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2023-12-02 08:33:47,450 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 54. [2023-12-02 08:33:47,451 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 54 states, 52 states have (on average 1.2307692307692308) internal successors, (64), 53 states have internal predecessors, (64), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 08:33:47,451 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 64 transitions. [2023-12-02 08:33:47,451 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 64 transitions. Word has length 17 [2023-12-02 08:33:47,452 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 08:33:47,452 INFO L495 AbstractCegarLoop]: Abstraction has 54 states and 64 transitions. [2023-12-02 08:33:47,452 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 16 states have (on average 2.0) internal successors, (32), 16 states have internal predecessors, (32), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 08:33:47,452 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 64 transitions. [2023-12-02 08:33:47,453 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2023-12-02 08:33:47,453 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 08:33:47,453 INFO L195 NwaCegarLoop]: trace histogram [3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 08:33:47,458 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Ended with exit code 0 [2023-12-02 08:33:47,658 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2023-12-02 08:33:47,659 INFO L420 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 10 more)] === [2023-12-02 08:33:47,659 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 08:33:47,659 INFO L85 PathProgramCache]: Analyzing trace with hash -964936553, now seen corresponding path program 2 times [2023-12-02 08:33:47,659 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 08:33:47,659 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1632499392] [2023-12-02 08:33:47,659 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 08:33:47,659 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 08:33:47,676 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 08:33:47,933 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 5 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 08:33:47,934 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 08:33:47,934 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1632499392] [2023-12-02 08:33:47,934 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1632499392] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 08:33:47,934 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [459526435] [2023-12-02 08:33:47,934 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-12-02 08:33:47,934 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 08:33:47,934 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 08:33:47,935 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 08:33:47,936 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-12-02 08:33:48,012 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2023-12-02 08:33:48,012 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 08:33:48,013 INFO L262 TraceCheckSpWp]: Trace formula consists of 160 conjuncts, 40 conjunts are in the unsatisfiable core [2023-12-02 08:33:48,015 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 08:33:48,065 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2023-12-02 08:33:48,105 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 5 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 08:33:48,105 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 08:33:48,123 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 13 [2023-12-02 08:33:48,126 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2023-12-02 08:33:48,172 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 5 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 08:33:48,172 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [459526435] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 08:33:48,172 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1917476711] [2023-12-02 08:33:48,174 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2023-12-02 08:33:48,174 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 08:33:48,175 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 08:33:48,175 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 08:33:48,175 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 08:33:48,915 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 08:33:50,241 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1633#(and (<= 2 |ULTIMATE.start_cstrspn_~s2#1.base|) (= |ULTIMATE.start_cstrspn_#in~s2#1.offset| 0) (<= 2 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |ULTIMATE.start_main_#t~malloc8#1.offset| 0) (<= 0 |ULTIMATE.start_cstrspn_#t~post4#1.offset|) (<= 1 |#StackHeapBarrier|) (= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (= |ULTIMATE.start_main_~length1~0#1| 1) (= |ULTIMATE.start_cstrspn_~p~0#1.offset| 1) (= |ULTIMATE.start_cstrspn_~spanp~0#1.base| |ULTIMATE.start_cstrspn_#t~post4#1.base|) (<= 2 |ULTIMATE.start_main_#t~malloc9#1.base|) (<= 2 |ULTIMATE.start_cstrspn_#in~s1#1.base|) (= |ULTIMATE.start_cstrspn_#in~s1#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc9#1.offset| 0) (= 0 |ULTIMATE.start_cstrspn_~s2#1.offset|) (= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 2 |ULTIMATE.start_cstrspn_~p~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 2 |ULTIMATE.start_main_#t~malloc8#1.base|) (<= 2 |ULTIMATE.start_cstrspn_#in~s2#1.base|) (<= (select |#length| |ULTIMATE.start_cstrspn_#t~post4#1.base|) |ULTIMATE.start_cstrspn_#t~post4#1.offset|) (<= 2 |ULTIMATE.start_cstrspn_~s1#1.base|) (<= 2 |ULTIMATE.start_main_~nondetString1~0#1.base|) (= |ULTIMATE.start_cstrspn_~s1#1.offset| 0) (= (+ |ULTIMATE.start_cstrspn_#t~post4#1.offset| 1) |ULTIMATE.start_cstrspn_~spanp~0#1.offset|) (<= 2 |ULTIMATE.start_cstrspn_#t~post4#1.base|))' at error location [2023-12-02 08:33:50,241 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 08:33:50,241 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 08:33:50,241 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 11, 11] total 21 [2023-12-02 08:33:50,242 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [317700760] [2023-12-02 08:33:50,242 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 08:33:50,242 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 21 states [2023-12-02 08:33:50,242 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 08:33:50,243 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2023-12-02 08:33:50,243 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=118, Invalid=936, Unknown=2, NotChecked=0, Total=1056 [2023-12-02 08:33:50,244 INFO L87 Difference]: Start difference. First operand 54 states and 64 transitions. Second operand has 21 states, 21 states have (on average 1.5714285714285714) internal successors, (33), 21 states have internal predecessors, (33), 0 states have call successors, (0), 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 08:33:50,465 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 08:33:50,465 INFO L93 Difference]: Finished difference Result 94 states and 105 transitions. [2023-12-02 08:33:50,466 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2023-12-02 08:33:50,466 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 21 states have (on average 1.5714285714285714) internal successors, (33), 21 states have internal predecessors, (33), 0 states have call successors, (0), 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 08:33:50,466 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 08:33:50,466 INFO L225 Difference]: With dead ends: 94 [2023-12-02 08:33:50,467 INFO L226 Difference]: Without dead ends: 77 [2023-12-02 08:33:50,468 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 76 GetRequests, 36 SyntacticMatches, 0 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 377 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=229, Invalid=1491, Unknown=2, NotChecked=0, Total=1722 [2023-12-02 08:33:50,468 INFO L413 NwaCegarLoop]: 9 mSDtfsCounter, 65 mSDsluCounter, 108 mSDsCounter, 0 mSdLazyCounter, 165 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 65 SdHoareTripleChecker+Valid, 117 SdHoareTripleChecker+Invalid, 166 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 165 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 08:33:50,469 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [65 Valid, 117 Invalid, 166 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 165 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 08:33:50,469 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 77 states. [2023-12-02 08:33:50,472 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 77 to 74. [2023-12-02 08:33:50,473 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 74 states, 72 states have (on average 1.1944444444444444) internal successors, (86), 73 states have internal predecessors, (86), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 08:33:50,473 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 74 states to 74 states and 86 transitions. [2023-12-02 08:33:50,473 INFO L78 Accepts]: Start accepts. Automaton has 74 states and 86 transitions. Word has length 19 [2023-12-02 08:33:50,473 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 08:33:50,474 INFO L495 AbstractCegarLoop]: Abstraction has 74 states and 86 transitions. [2023-12-02 08:33:50,474 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 21 states, 21 states have (on average 1.5714285714285714) internal successors, (33), 21 states have internal predecessors, (33), 0 states have call successors, (0), 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 08:33:50,474 INFO L276 IsEmpty]: Start isEmpty. Operand 74 states and 86 transitions. [2023-12-02 08:33:50,475 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2023-12-02 08:33:50,475 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 08:33:50,475 INFO L195 NwaCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 08:33:50,480 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2023-12-02 08:33:50,675 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2023-12-02 08:33:50,676 INFO L420 AbstractCegarLoop]: === Iteration 19 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 10 more)] === [2023-12-02 08:33:50,676 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 08:33:50,676 INFO L85 PathProgramCache]: Analyzing trace with hash 1320277916, now seen corresponding path program 3 times [2023-12-02 08:33:50,676 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 08:33:50,676 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1203014595] [2023-12-02 08:33:50,676 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 08:33:50,676 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 08:33:50,688 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 08:33:50,999 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 08:33:50,999 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 08:33:50,999 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1203014595] [2023-12-02 08:33:51,000 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1203014595] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 08:33:51,000 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1759903142] [2023-12-02 08:33:51,000 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-12-02 08:33:51,000 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 08:33:51,000 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 08:33:51,003 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 08:33:51,005 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2023-12-02 08:33:51,091 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-12-02 08:33:51,091 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 08:33:51,093 INFO L262 TraceCheckSpWp]: Trace formula consists of 173 conjuncts, 37 conjunts are in the unsatisfiable core [2023-12-02 08:33:51,096 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 08:33:51,102 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 1 [2023-12-02 08:33:51,224 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 08:33:51,224 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 08:33:51,463 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 08:33:51,463 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1759903142] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 08:33:51,463 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [433117451] [2023-12-02 08:33:51,464 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2023-12-02 08:33:51,464 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 08:33:51,465 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 08:33:51,465 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 08:33:51,465 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 08:33:52,266 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 08:33:53,525 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1978#(and (<= 2 |ULTIMATE.start_cstrspn_~s2#1.base|) (= |ULTIMATE.start_cstrspn_#in~s2#1.offset| 0) (<= 2 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |ULTIMATE.start_main_#t~malloc8#1.offset| 0) (<= 0 |ULTIMATE.start_cstrspn_#t~post4#1.offset|) (<= 1 |#StackHeapBarrier|) (= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (= |ULTIMATE.start_main_~length1~0#1| 1) (= |ULTIMATE.start_cstrspn_~p~0#1.offset| 1) (= |ULTIMATE.start_cstrspn_~spanp~0#1.base| |ULTIMATE.start_cstrspn_#t~post4#1.base|) (<= 2 |ULTIMATE.start_main_#t~malloc9#1.base|) (<= 2 |ULTIMATE.start_cstrspn_#in~s1#1.base|) (= |ULTIMATE.start_cstrspn_#in~s1#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc9#1.offset| 0) (= 0 |ULTIMATE.start_cstrspn_~s2#1.offset|) (= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 2 |ULTIMATE.start_cstrspn_~p~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 2 |ULTIMATE.start_main_#t~malloc8#1.base|) (<= 2 |ULTIMATE.start_cstrspn_#in~s2#1.base|) (<= (select |#length| |ULTIMATE.start_cstrspn_#t~post4#1.base|) |ULTIMATE.start_cstrspn_#t~post4#1.offset|) (<= 2 |ULTIMATE.start_cstrspn_~s1#1.base|) (<= 2 |ULTIMATE.start_main_~nondetString1~0#1.base|) (= |ULTIMATE.start_cstrspn_~s1#1.offset| 0) (= (+ |ULTIMATE.start_cstrspn_#t~post4#1.offset| 1) |ULTIMATE.start_cstrspn_~spanp~0#1.offset|) (<= 2 |ULTIMATE.start_cstrspn_#t~post4#1.base|))' at error location [2023-12-02 08:33:53,525 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 08:33:53,525 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 08:33:53,525 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10] total 26 [2023-12-02 08:33:53,525 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1094230232] [2023-12-02 08:33:53,525 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 08:33:53,525 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 27 states [2023-12-02 08:33:53,525 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 08:33:53,526 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2023-12-02 08:33:53,527 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=135, Invalid=1345, Unknown=2, NotChecked=0, Total=1482 [2023-12-02 08:33:53,527 INFO L87 Difference]: Start difference. First operand 74 states and 86 transitions. Second operand has 27 states, 26 states have (on average 2.076923076923077) internal successors, (54), 27 states have internal predecessors, (54), 0 states have call successors, (0), 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 08:33:54,041 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 08:33:54,042 INFO L93 Difference]: Finished difference Result 100 states and 113 transitions. [2023-12-02 08:33:54,042 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2023-12-02 08:33:54,042 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 26 states have (on average 2.076923076923077) internal successors, (54), 27 states have internal predecessors, (54), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2023-12-02 08:33:54,042 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 08:33:54,044 INFO L225 Difference]: With dead ends: 100 [2023-12-02 08:33:54,044 INFO L226 Difference]: Without dead ends: 100 [2023-12-02 08:33:54,045 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 81 GetRequests, 34 SyntacticMatches, 0 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 573 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=263, Invalid=2087, Unknown=2, NotChecked=0, Total=2352 [2023-12-02 08:33:54,046 INFO L413 NwaCegarLoop]: 15 mSDtfsCounter, 77 mSDsluCounter, 164 mSDsCounter, 0 mSdLazyCounter, 395 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 77 SdHoareTripleChecker+Valid, 179 SdHoareTripleChecker+Invalid, 397 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 395 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-12-02 08:33:54,046 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [77 Valid, 179 Invalid, 397 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 395 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-12-02 08:33:54,046 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 100 states. [2023-12-02 08:33:54,050 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 100 to 86. [2023-12-02 08:33:54,050 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 86 states, 84 states have (on average 1.1904761904761905) internal successors, (100), 85 states have internal predecessors, (100), 0 states have call successors, (0), 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 08:33:54,050 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 86 states to 86 states and 100 transitions. [2023-12-02 08:33:54,051 INFO L78 Accepts]: Start accepts. Automaton has 86 states and 100 transitions. Word has length 21 [2023-12-02 08:33:54,051 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 08:33:54,051 INFO L495 AbstractCegarLoop]: Abstraction has 86 states and 100 transitions. [2023-12-02 08:33:54,051 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 27 states, 26 states have (on average 2.076923076923077) internal successors, (54), 27 states have internal predecessors, (54), 0 states have call successors, (0), 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 08:33:54,051 INFO L276 IsEmpty]: Start isEmpty. Operand 86 states and 100 transitions. [2023-12-02 08:33:54,052 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2023-12-02 08:33:54,052 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 08:33:54,052 INFO L195 NwaCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 08:33:54,056 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Ended with exit code 0 [2023-12-02 08:33:54,252 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 08:33:54,253 INFO L420 AbstractCegarLoop]: === Iteration 20 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 10 more)] === [2023-12-02 08:33:54,253 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 08:33:54,253 INFO L85 PathProgramCache]: Analyzing trace with hash 2052245285, now seen corresponding path program 2 times [2023-12-02 08:33:54,253 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 08:33:54,253 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2078330390] [2023-12-02 08:33:54,253 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 08:33:54,253 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 08:33:54,271 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 08:33:54,795 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 4 proven. 7 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 08:33:54,796 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 08:33:54,796 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2078330390] [2023-12-02 08:33:54,796 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2078330390] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 08:33:54,796 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1605695421] [2023-12-02 08:33:54,796 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-12-02 08:33:54,796 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 08:33:54,796 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 08:33:54,797 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 08:33:54,799 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2023-12-02 08:33:54,878 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2023-12-02 08:33:54,878 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 08:33:54,880 INFO L262 TraceCheckSpWp]: Trace formula consists of 193 conjuncts, 45 conjunts are in the unsatisfiable core [2023-12-02 08:33:54,882 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 08:33:54,888 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2023-12-02 08:33:54,988 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 13 treesize of output 9 [2023-12-02 08:33:55,018 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 18 treesize of output 13 [2023-12-02 08:33:55,070 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 4 proven. 7 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 08:33:55,070 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 08:33:55,122 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-12-02 08:33:55,123 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 23 treesize of output 24 [2023-12-02 08:33:55,129 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-12-02 08:33:55,129 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 37 treesize of output 32 [2023-12-02 08:33:55,211 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 4 proven. 7 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 08:33:55,211 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1605695421] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 08:33:55,212 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1678483881] [2023-12-02 08:33:55,213 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2023-12-02 08:33:55,213 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 08:33:55,213 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 08:33:55,213 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 08:33:55,213 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 08:33:56,289 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 08:33:56,967 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2351#(or (< (select |#length| |ULTIMATE.start_cstrspn_#t~post2#1.base|) (+ |ULTIMATE.start_cstrspn_#t~post2#1.offset| 1)) (< |ULTIMATE.start_cstrspn_#t~post2#1.offset| 0))' at error location [2023-12-02 08:33:56,967 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 08:33:56,967 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 08:33:56,968 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 11, 11] total 22 [2023-12-02 08:33:56,968 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1801748200] [2023-12-02 08:33:56,968 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 08:33:56,968 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2023-12-02 08:33:56,968 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 08:33:56,969 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2023-12-02 08:33:56,969 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=84, Invalid=1036, Unknown=2, NotChecked=0, Total=1122 [2023-12-02 08:33:56,969 INFO L87 Difference]: Start difference. First operand 86 states and 100 transitions. Second operand has 23 states, 23 states have (on average 1.7826086956521738) internal successors, (41), 22 states have internal predecessors, (41), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 08:33:57,523 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 08:33:57,523 INFO L93 Difference]: Finished difference Result 144 states and 163 transitions. [2023-12-02 08:33:57,523 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2023-12-02 08:33:57,524 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 1.7826086956521738) internal successors, (41), 22 states have internal predecessors, (41), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 23 [2023-12-02 08:33:57,524 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 08:33:57,525 INFO L225 Difference]: With dead ends: 144 [2023-12-02 08:33:57,525 INFO L226 Difference]: Without dead ends: 130 [2023-12-02 08:33:57,525 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 91 GetRequests, 47 SyntacticMatches, 0 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 276 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=240, Invalid=1828, Unknown=2, NotChecked=0, Total=2070 [2023-12-02 08:33:57,526 INFO L413 NwaCegarLoop]: 16 mSDtfsCounter, 107 mSDsluCounter, 197 mSDsCounter, 0 mSdLazyCounter, 305 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 107 SdHoareTripleChecker+Valid, 213 SdHoareTripleChecker+Invalid, 311 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 305 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-12-02 08:33:57,526 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [107 Valid, 213 Invalid, 311 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 305 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-12-02 08:33:57,526 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 130 states. [2023-12-02 08:33:57,528 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 130 to 111. [2023-12-02 08:33:57,529 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 111 states, 109 states have (on average 1.201834862385321) internal successors, (131), 110 states have internal predecessors, (131), 0 states have call successors, (0), 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 08:33:57,529 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 111 states to 111 states and 131 transitions. [2023-12-02 08:33:57,529 INFO L78 Accepts]: Start accepts. Automaton has 111 states and 131 transitions. Word has length 23 [2023-12-02 08:33:57,529 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 08:33:57,529 INFO L495 AbstractCegarLoop]: Abstraction has 111 states and 131 transitions. [2023-12-02 08:33:57,529 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 23 states have (on average 1.7826086956521738) internal successors, (41), 22 states have internal predecessors, (41), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 08:33:57,530 INFO L276 IsEmpty]: Start isEmpty. Operand 111 states and 131 transitions. [2023-12-02 08:33:57,530 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2023-12-02 08:33:57,530 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 08:33:57,531 INFO L195 NwaCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 08:33:57,535 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Ended with exit code 0 [2023-12-02 08:33:57,731 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 08:33:57,731 INFO L420 AbstractCegarLoop]: === Iteration 21 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 10 more)] === [2023-12-02 08:33:57,732 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 08:33:57,732 INFO L85 PathProgramCache]: Analyzing trace with hash -917603309, now seen corresponding path program 3 times [2023-12-02 08:33:57,732 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 08:33:57,732 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [260585632] [2023-12-02 08:33:57,732 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 08:33:57,732 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 08:33:57,743 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 08:33:57,972 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 14 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 08:33:57,972 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 08:33:57,972 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [260585632] [2023-12-02 08:33:57,972 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [260585632] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 08:33:57,973 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [56106836] [2023-12-02 08:33:57,973 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-12-02 08:33:57,973 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 08:33:57,973 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 08:33:57,974 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 08:33:57,976 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2023-12-02 08:33:58,077 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-12-02 08:33:58,077 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 08:33:58,079 INFO L262 TraceCheckSpWp]: Trace formula consists of 206 conjuncts, 36 conjunts are in the unsatisfiable core [2023-12-02 08:33:58,082 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 08:33:58,186 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 1 proven. 13 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 08:33:58,186 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 08:33:58,365 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 5 treesize of output 3 [2023-12-02 08:33:58,390 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 1 proven. 13 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 08:33:58,391 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [56106836] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 08:33:58,391 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [957380015] [2023-12-02 08:33:58,392 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2023-12-02 08:33:58,392 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 08:33:58,392 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 08:33:58,392 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 08:33:58,393 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 08:33:59,476 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 08:34:00,181 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2804#(or (< (select |#length| |ULTIMATE.start_cstrspn_#t~post2#1.base|) (+ |ULTIMATE.start_cstrspn_#t~post2#1.offset| 1)) (< |ULTIMATE.start_cstrspn_#t~post2#1.offset| 0))' at error location [2023-12-02 08:34:00,182 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 08:34:00,182 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 08:34:00,182 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 17 [2023-12-02 08:34:00,182 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [3166504] [2023-12-02 08:34:00,182 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 08:34:00,182 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2023-12-02 08:34:00,182 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 08:34:00,183 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2023-12-02 08:34:00,183 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=74, Invalid=796, Unknown=0, NotChecked=0, Total=870 [2023-12-02 08:34:00,184 INFO L87 Difference]: Start difference. First operand 111 states and 131 transitions. Second operand has 19 states, 18 states have (on average 2.5555555555555554) internal successors, (46), 18 states have internal predecessors, (46), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 08:34:00,598 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 08:34:00,599 INFO L93 Difference]: Finished difference Result 136 states and 157 transitions. [2023-12-02 08:34:00,599 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2023-12-02 08:34:00,599 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 18 states have (on average 2.5555555555555554) internal successors, (46), 18 states have internal predecessors, (46), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 25 [2023-12-02 08:34:00,599 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 08:34:00,600 INFO L225 Difference]: With dead ends: 136 [2023-12-02 08:34:00,600 INFO L226 Difference]: Without dead ends: 136 [2023-12-02 08:34:00,601 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 90 GetRequests, 51 SyntacticMatches, 3 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 183 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=137, Invalid=1269, Unknown=0, NotChecked=0, Total=1406 [2023-12-02 08:34:00,601 INFO L413 NwaCegarLoop]: 16 mSDtfsCounter, 64 mSDsluCounter, 178 mSDsCounter, 0 mSdLazyCounter, 422 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 64 SdHoareTripleChecker+Valid, 194 SdHoareTripleChecker+Invalid, 422 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 422 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-12-02 08:34:00,602 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [64 Valid, 194 Invalid, 422 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 422 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-12-02 08:34:00,602 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 136 states. [2023-12-02 08:34:00,605 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 136 to 133. [2023-12-02 08:34:00,605 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 133 states, 131 states have (on average 1.1984732824427482) internal successors, (157), 132 states have internal predecessors, (157), 0 states have call successors, (0), 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 08:34:00,606 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 133 states to 133 states and 157 transitions. [2023-12-02 08:34:00,606 INFO L78 Accepts]: Start accepts. Automaton has 133 states and 157 transitions. Word has length 25 [2023-12-02 08:34:00,606 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 08:34:00,606 INFO L495 AbstractCegarLoop]: Abstraction has 133 states and 157 transitions. [2023-12-02 08:34:00,607 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 18 states have (on average 2.5555555555555554) internal successors, (46), 18 states have internal predecessors, (46), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 08:34:00,607 INFO L276 IsEmpty]: Start isEmpty. Operand 133 states and 157 transitions. [2023-12-02 08:34:00,608 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2023-12-02 08:34:00,608 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 08:34:00,608 INFO L195 NwaCegarLoop]: trace histogram [4, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 08:34:00,612 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Ended with exit code 0 [2023-12-02 08:34:00,808 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable20 [2023-12-02 08:34:00,809 INFO L420 AbstractCegarLoop]: === Iteration 22 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 10 more)] === [2023-12-02 08:34:00,809 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 08:34:00,809 INFO L85 PathProgramCache]: Analyzing trace with hash 1848866976, now seen corresponding path program 4 times [2023-12-02 08:34:00,809 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 08:34:00,809 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [350294086] [2023-12-02 08:34:00,809 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 08:34:00,810 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 08:34:00,822 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 08:34:01,069 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 8 proven. 14 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 08:34:01,069 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 08:34:01,069 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [350294086] [2023-12-02 08:34:01,069 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [350294086] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 08:34:01,069 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1118226117] [2023-12-02 08:34:01,069 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-12-02 08:34:01,069 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 08:34:01,070 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 08:34:01,070 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 08:34:01,072 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2023-12-02 08:34:01,160 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 08:34:01,161 INFO L262 TraceCheckSpWp]: Trace formula consists of 191 conjuncts, 49 conjunts are in the unsatisfiable core [2023-12-02 08:34:01,163 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 08:34:01,254 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2023-12-02 08:34:01,530 INFO L173 IndexEqualityManager]: detected equality via solver [2023-12-02 08:34:01,532 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-12-02 08:34:01,532 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 17 treesize of output 10 [2023-12-02 08:34:01,535 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 8 proven. 14 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 08:34:01,535 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 08:34:01,679 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 13 [2023-12-02 08:34:01,681 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 20 [2023-12-02 08:34:01,911 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 8 proven. 14 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 08:34:01,911 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1118226117] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 08:34:01,911 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1485514136] [2023-12-02 08:34:01,913 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2023-12-02 08:34:01,913 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 08:34:01,913 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 08:34:01,913 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 08:34:01,914 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 08:34:02,526 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 08:34:04,110 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3279#(and (<= 2 |ULTIMATE.start_cstrspn_~s2#1.base|) (= |ULTIMATE.start_cstrspn_#in~s2#1.offset| 0) (<= 2 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |ULTIMATE.start_main_#t~malloc8#1.offset| 0) (<= 0 |ULTIMATE.start_cstrspn_#t~post4#1.offset|) (<= 1 |#StackHeapBarrier|) (= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (= |ULTIMATE.start_main_~length1~0#1| 1) (= |ULTIMATE.start_cstrspn_~p~0#1.offset| 1) (= |ULTIMATE.start_cstrspn_~spanp~0#1.base| |ULTIMATE.start_cstrspn_#t~post4#1.base|) (<= 2 |ULTIMATE.start_main_#t~malloc9#1.base|) (<= 2 |ULTIMATE.start_cstrspn_#in~s1#1.base|) (= |ULTIMATE.start_cstrspn_#in~s1#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc9#1.offset| 0) (= 0 |ULTIMATE.start_cstrspn_~s2#1.offset|) (= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 2 |ULTIMATE.start_cstrspn_~p~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 2 |ULTIMATE.start_main_#t~malloc8#1.base|) (<= 2 |ULTIMATE.start_cstrspn_#in~s2#1.base|) (<= (select |#length| |ULTIMATE.start_cstrspn_#t~post4#1.base|) |ULTIMATE.start_cstrspn_#t~post4#1.offset|) (<= 2 |ULTIMATE.start_cstrspn_~s1#1.base|) (<= 2 |ULTIMATE.start_main_~nondetString1~0#1.base|) (= |ULTIMATE.start_cstrspn_~s1#1.offset| 0) (= (+ |ULTIMATE.start_cstrspn_#t~post4#1.offset| 1) |ULTIMATE.start_cstrspn_~spanp~0#1.offset|) (<= 2 |ULTIMATE.start_cstrspn_#t~post4#1.base|))' at error location [2023-12-02 08:34:04,110 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 08:34:04,110 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 08:34:04,110 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14, 14] total 34 [2023-12-02 08:34:04,111 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1688701413] [2023-12-02 08:34:04,111 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 08:34:04,111 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2023-12-02 08:34:04,111 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 08:34:04,112 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2023-12-02 08:34:04,112 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=193, Invalid=1967, Unknown=2, NotChecked=0, Total=2162 [2023-12-02 08:34:04,112 INFO L87 Difference]: Start difference. First operand 133 states and 157 transitions. Second operand has 35 states, 35 states have (on average 1.6571428571428573) internal successors, (58), 34 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 08:34:04,574 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 08:34:04,574 INFO L93 Difference]: Finished difference Result 227 states and 257 transitions. [2023-12-02 08:34:04,574 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2023-12-02 08:34:04,574 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 35 states have (on average 1.6571428571428573) internal successors, (58), 34 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 25 [2023-12-02 08:34:04,575 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 08:34:04,576 INFO L225 Difference]: With dead ends: 227 [2023-12-02 08:34:04,576 INFO L226 Difference]: Without dead ends: 184 [2023-12-02 08:34:04,577 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 97 GetRequests, 41 SyntacticMatches, 1 SemanticMatches, 55 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 875 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=341, Invalid=2849, Unknown=2, NotChecked=0, Total=3192 [2023-12-02 08:34:04,578 INFO L413 NwaCegarLoop]: 16 mSDtfsCounter, 175 mSDsluCounter, 199 mSDsCounter, 0 mSdLazyCounter, 324 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 175 SdHoareTripleChecker+Valid, 215 SdHoareTripleChecker+Invalid, 327 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 324 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-12-02 08:34:04,578 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [175 Valid, 215 Invalid, 327 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 324 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-12-02 08:34:04,578 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 184 states. [2023-12-02 08:34:04,582 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 184 to 173. [2023-12-02 08:34:04,582 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 173 states, 171 states have (on average 1.1812865497076024) internal successors, (202), 172 states have internal predecessors, (202), 0 states have call successors, (0), 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 08:34:04,582 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 173 states to 173 states and 202 transitions. [2023-12-02 08:34:04,583 INFO L78 Accepts]: Start accepts. Automaton has 173 states and 202 transitions. Word has length 25 [2023-12-02 08:34:04,583 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 08:34:04,583 INFO L495 AbstractCegarLoop]: Abstraction has 173 states and 202 transitions. [2023-12-02 08:34:04,583 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 35 states, 35 states have (on average 1.6571428571428573) internal successors, (58), 34 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 08:34:04,583 INFO L276 IsEmpty]: Start isEmpty. Operand 173 states and 202 transitions. [2023-12-02 08:34:04,584 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2023-12-02 08:34:04,584 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 08:34:04,584 INFO L195 NwaCegarLoop]: trace histogram [4, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 08:34:04,589 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Ended with exit code 0 [2023-12-02 08:34:04,784 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable21 [2023-12-02 08:34:04,785 INFO L420 AbstractCegarLoop]: === Iteration 23 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 10 more)] === [2023-12-02 08:34:04,785 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 08:34:04,785 INFO L85 PathProgramCache]: Analyzing trace with hash -1459094555, now seen corresponding path program 5 times [2023-12-02 08:34:04,785 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 08:34:04,785 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [405427081] [2023-12-02 08:34:04,785 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 08:34:04,785 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 08:34:04,797 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 08:34:05,124 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 1 proven. 26 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 08:34:05,125 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 08:34:05,125 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [405427081] [2023-12-02 08:34:05,125 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [405427081] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 08:34:05,125 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1415198603] [2023-12-02 08:34:05,125 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-12-02 08:34:05,126 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 08:34:05,126 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 08:34:05,127 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 08:34:05,136 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2023-12-02 08:34:05,338 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2023-12-02 08:34:05,338 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 08:34:05,340 INFO L262 TraceCheckSpWp]: Trace formula consists of 204 conjuncts, 41 conjunts are in the unsatisfiable core [2023-12-02 08:34:05,343 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 08:34:05,571 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 4 proven. 23 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 08:34:05,571 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 08:34:05,798 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 7 treesize of output 5 [2023-12-02 08:34:05,852 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 4 proven. 23 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 08:34:05,852 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1415198603] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 08:34:05,852 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1506280099] [2023-12-02 08:34:05,854 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2023-12-02 08:34:05,854 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 08:34:05,854 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 08:34:05,854 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 08:34:05,854 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 08:34:06,517 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 08:34:07,766 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3899#(and (<= 2 |ULTIMATE.start_cstrspn_~s2#1.base|) (= |ULTIMATE.start_cstrspn_#in~s2#1.offset| 0) (<= 2 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |ULTIMATE.start_main_#t~malloc8#1.offset| 0) (<= 0 |ULTIMATE.start_cstrspn_#t~post4#1.offset|) (<= 1 |#StackHeapBarrier|) (= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (= |ULTIMATE.start_main_~length1~0#1| 1) (= |ULTIMATE.start_cstrspn_~p~0#1.offset| 1) (= |ULTIMATE.start_cstrspn_~spanp~0#1.base| |ULTIMATE.start_cstrspn_#t~post4#1.base|) (<= 2 |ULTIMATE.start_main_#t~malloc9#1.base|) (<= 2 |ULTIMATE.start_cstrspn_#in~s1#1.base|) (= |ULTIMATE.start_cstrspn_#in~s1#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc9#1.offset| 0) (= 0 |ULTIMATE.start_cstrspn_~s2#1.offset|) (= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 2 |ULTIMATE.start_cstrspn_~p~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 2 |ULTIMATE.start_main_#t~malloc8#1.base|) (<= 2 |ULTIMATE.start_cstrspn_#in~s2#1.base|) (<= (select |#length| |ULTIMATE.start_cstrspn_#t~post4#1.base|) |ULTIMATE.start_cstrspn_#t~post4#1.offset|) (<= 2 |ULTIMATE.start_cstrspn_~s1#1.base|) (<= 2 |ULTIMATE.start_main_~nondetString1~0#1.base|) (= |ULTIMATE.start_cstrspn_~s1#1.offset| 0) (= (+ |ULTIMATE.start_cstrspn_#t~post4#1.offset| 1) |ULTIMATE.start_cstrspn_~spanp~0#1.offset|) (<= 2 |ULTIMATE.start_cstrspn_#t~post4#1.base|))' at error location [2023-12-02 08:34:07,766 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 08:34:07,766 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 08:34:07,766 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12] total 31 [2023-12-02 08:34:07,766 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1064788631] [2023-12-02 08:34:07,767 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 08:34:07,767 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2023-12-02 08:34:07,767 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 08:34:07,767 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2023-12-02 08:34:07,768 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=176, Invalid=1715, Unknown=1, NotChecked=0, Total=1892 [2023-12-02 08:34:07,768 INFO L87 Difference]: Start difference. First operand 173 states and 202 transitions. Second operand has 32 states, 31 states have (on average 2.2903225806451615) internal successors, (71), 32 states have internal predecessors, (71), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 08:34:08,347 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 08:34:08,347 INFO L93 Difference]: Finished difference Result 226 states and 258 transitions. [2023-12-02 08:34:08,347 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2023-12-02 08:34:08,348 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 31 states have (on average 2.2903225806451615) internal successors, (71), 32 states have internal predecessors, (71), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 27 [2023-12-02 08:34:08,348 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 08:34:08,349 INFO L225 Difference]: With dead ends: 226 [2023-12-02 08:34:08,349 INFO L226 Difference]: Without dead ends: 226 [2023-12-02 08:34:08,350 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 103 GetRequests, 45 SyntacticMatches, 4 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 928 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=349, Invalid=2730, Unknown=1, NotChecked=0, Total=3080 [2023-12-02 08:34:08,351 INFO L413 NwaCegarLoop]: 19 mSDtfsCounter, 141 mSDsluCounter, 186 mSDsCounter, 0 mSdLazyCounter, 437 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 141 SdHoareTripleChecker+Valid, 205 SdHoareTripleChecker+Invalid, 438 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 437 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-12-02 08:34:08,351 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [141 Valid, 205 Invalid, 438 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 437 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-12-02 08:34:08,352 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 226 states. [2023-12-02 08:34:08,356 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 226 to 193. [2023-12-02 08:34:08,357 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 193 states, 191 states have (on average 1.1832460732984293) internal successors, (226), 192 states have internal predecessors, (226), 0 states have call successors, (0), 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 08:34:08,357 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 193 states to 193 states and 226 transitions. [2023-12-02 08:34:08,358 INFO L78 Accepts]: Start accepts. Automaton has 193 states and 226 transitions. Word has length 27 [2023-12-02 08:34:08,358 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 08:34:08,358 INFO L495 AbstractCegarLoop]: Abstraction has 193 states and 226 transitions. [2023-12-02 08:34:08,358 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 31 states have (on average 2.2903225806451615) internal successors, (71), 32 states have internal predecessors, (71), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 08:34:08,358 INFO L276 IsEmpty]: Start isEmpty. Operand 193 states and 226 transitions. [2023-12-02 08:34:08,359 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2023-12-02 08:34:08,359 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 08:34:08,359 INFO L195 NwaCegarLoop]: trace histogram [4, 3, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 08:34:08,363 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Ended with exit code 0 [2023-12-02 08:34:08,559 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable22 [2023-12-02 08:34:08,560 INFO L420 AbstractCegarLoop]: === Iteration 24 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 10 more)] === [2023-12-02 08:34:08,560 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 08:34:08,560 INFO L85 PathProgramCache]: Analyzing trace with hash -739878215, now seen corresponding path program 4 times [2023-12-02 08:34:08,560 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 08:34:08,560 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1118839929] [2023-12-02 08:34:08,560 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 08:34:08,560 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 08:34:08,585 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 08:34:10,129 INFO L134 CoverageAnalysis]: Checked inductivity of 29 backedges. 6 proven. 23 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 08:34:10,129 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 08:34:10,130 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1118839929] [2023-12-02 08:34:10,130 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1118839929] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 08:34:10,130 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1582723939] [2023-12-02 08:34:10,130 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-12-02 08:34:10,130 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 08:34:10,130 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 08:34:10,131 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 08:34:10,131 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2023-12-02 08:34:10,215 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 08:34:10,217 INFO L262 TraceCheckSpWp]: Trace formula consists of 243 conjuncts, 59 conjunts are in the unsatisfiable core [2023-12-02 08:34:10,219 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 08:34:10,226 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2023-12-02 08:34:10,423 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 08:34:10,462 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 08:34:10,623 INFO L134 CoverageAnalysis]: Checked inductivity of 29 backedges. 6 proven. 22 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 08:34:10,623 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 08:34:10,764 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-12-02 08:34:10,764 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 23 treesize of output 24 [2023-12-02 08:34:10,770 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-12-02 08:34:10,770 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 37 treesize of output 32 [2023-12-02 08:34:10,776 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 7 treesize of output 3 [2023-12-02 08:34:10,978 INFO L134 CoverageAnalysis]: Checked inductivity of 29 backedges. 6 proven. 22 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 08:34:10,978 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1582723939] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 08:34:10,978 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [573887492] [2023-12-02 08:34:10,980 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2023-12-02 08:34:10,980 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 08:34:10,980 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 08:34:10,980 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 08:34:10,980 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 08:34:12,207 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 08:34:13,962 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4576#(and (= |ULTIMATE.start_cstrspn_#in~s2#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc8#1.offset| 0) (<= 0 |ULTIMATE.start_cstrspn_#t~post2#1.offset|) (= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (= |ULTIMATE.start_cstrspn_#in~s1#1.offset| 0) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (= |ULTIMATE.start_main_#t~malloc9#1.offset| 0) (= 0 |ULTIMATE.start_cstrspn_~s2#1.offset|) (= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 1 |ULTIMATE.start_cstrspn_~p~0#1.offset|) (= |ULTIMATE.start_cstrspn_~s1#1.offset| 0) (<= (select |#length| |ULTIMATE.start_cstrspn_#t~post2#1.base|) |ULTIMATE.start_cstrspn_#t~post2#1.offset|))' at error location [2023-12-02 08:34:13,963 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 08:34:13,963 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 08:34:13,963 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 13, 13] total 41 [2023-12-02 08:34:13,963 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [576269960] [2023-12-02 08:34:13,963 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 08:34:13,964 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 42 states [2023-12-02 08:34:13,964 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 08:34:13,964 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2023-12-02 08:34:13,965 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=160, Invalid=2796, Unknown=14, NotChecked=0, Total=2970 [2023-12-02 08:34:13,965 INFO L87 Difference]: Start difference. First operand 193 states and 226 transitions. Second operand has 42 states, 42 states have (on average 1.9285714285714286) internal successors, (81), 41 states have internal predecessors, (81), 0 states have call successors, (0), 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 08:34:16,039 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 08:34:16,040 INFO L93 Difference]: Finished difference Result 322 states and 367 transitions. [2023-12-02 08:34:16,040 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2023-12-02 08:34:16,040 INFO L78 Accepts]: Start accepts. Automaton has has 42 states, 42 states have (on average 1.9285714285714286) internal successors, (81), 41 states have internal predecessors, (81), 0 states have call successors, (0), 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 31 [2023-12-02 08:34:16,040 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 08:34:16,042 INFO L225 Difference]: With dead ends: 322 [2023-12-02 08:34:16,042 INFO L226 Difference]: Without dead ends: 269 [2023-12-02 08:34:16,045 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 154 GetRequests, 60 SyntacticMatches, 0 SemanticMatches, 94 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2034 ImplicationChecksByTransitivity, 4.4s TimeCoverageRelationStatistics Valid=744, Invalid=8362, Unknown=14, NotChecked=0, Total=9120 [2023-12-02 08:34:16,046 INFO L413 NwaCegarLoop]: 16 mSDtfsCounter, 238 mSDsluCounter, 331 mSDsCounter, 0 mSdLazyCounter, 1038 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 238 SdHoareTripleChecker+Valid, 347 SdHoareTripleChecker+Invalid, 1045 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 1038 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2023-12-02 08:34:16,046 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [238 Valid, 347 Invalid, 1045 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 1038 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2023-12-02 08:34:16,046 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 269 states. [2023-12-02 08:34:16,051 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 269 to 224. [2023-12-02 08:34:16,052 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 224 states, 222 states have (on average 1.1891891891891893) internal successors, (264), 223 states have internal predecessors, (264), 0 states have call successors, (0), 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 08:34:16,053 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 224 states to 224 states and 264 transitions. [2023-12-02 08:34:16,053 INFO L78 Accepts]: Start accepts. Automaton has 224 states and 264 transitions. Word has length 31 [2023-12-02 08:34:16,053 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 08:34:16,053 INFO L495 AbstractCegarLoop]: Abstraction has 224 states and 264 transitions. [2023-12-02 08:34:16,053 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 42 states, 42 states have (on average 1.9285714285714286) internal successors, (81), 41 states have internal predecessors, (81), 0 states have call successors, (0), 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 08:34:16,053 INFO L276 IsEmpty]: Start isEmpty. Operand 224 states and 264 transitions. [2023-12-02 08:34:16,054 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2023-12-02 08:34:16,054 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 08:34:16,054 INFO L195 NwaCegarLoop]: trace histogram [5, 4, 4, 4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 08:34:16,059 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2023-12-02 08:34:16,254 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable23 [2023-12-02 08:34:16,254 INFO L420 AbstractCegarLoop]: === Iteration 25 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 10 more)] === [2023-12-02 08:34:16,255 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 08:34:16,255 INFO L85 PathProgramCache]: Analyzing trace with hash -1394847639, now seen corresponding path program 6 times [2023-12-02 08:34:16,255 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 08:34:16,255 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1016491639] [2023-12-02 08:34:16,255 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 08:34:16,255 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 08:34:16,275 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 08:34:16,600 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 11 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 08:34:16,600 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 08:34:16,600 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1016491639] [2023-12-02 08:34:16,600 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1016491639] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 08:34:16,600 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [773581999] [2023-12-02 08:34:16,600 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-12-02 08:34:16,600 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 08:34:16,600 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 08:34:16,601 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 08:34:16,604 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2023-12-02 08:34:16,691 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-12-02 08:34:16,691 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 08:34:16,693 INFO L262 TraceCheckSpWp]: Trace formula consists of 222 conjuncts, 66 conjunts are in the unsatisfiable core [2023-12-02 08:34:16,696 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 08:34:16,808 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2023-12-02 08:34:20,121 INFO L349 Elim1Store]: treesize reduction 13, result has 48.0 percent of original size [2023-12-02 08:34:20,122 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 4 new quantified variables, introduced 6 case distinctions, treesize of input 38 treesize of output 26 [2023-12-02 08:34:20,125 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 13 proven. 21 refuted. 7 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 08:34:20,125 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 08:34:20,474 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 46 treesize of output 40 [2023-12-02 08:34:20,477 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-12-02 08:34:20,478 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 46 treesize of output 34 [2023-12-02 08:34:20,695 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 23 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 08:34:20,695 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [773581999] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 08:34:20,695 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2086955539] [2023-12-02 08:34:20,697 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2023-12-02 08:34:20,697 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 08:34:20,697 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 08:34:20,697 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 08:34:20,697 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 08:34:21,304 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 08:34:23,009 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '5442#(and (<= 2 |ULTIMATE.start_cstrspn_~s2#1.base|) (= |ULTIMATE.start_cstrspn_#in~s2#1.offset| 0) (<= 2 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |ULTIMATE.start_main_#t~malloc8#1.offset| 0) (<= 0 |ULTIMATE.start_cstrspn_#t~post4#1.offset|) (<= 1 |#StackHeapBarrier|) (= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (= |ULTIMATE.start_main_~length1~0#1| 1) (= |ULTIMATE.start_cstrspn_~p~0#1.offset| 1) (= |ULTIMATE.start_cstrspn_~spanp~0#1.base| |ULTIMATE.start_cstrspn_#t~post4#1.base|) (<= 2 |ULTIMATE.start_main_#t~malloc9#1.base|) (<= 2 |ULTIMATE.start_cstrspn_#in~s1#1.base|) (= |ULTIMATE.start_cstrspn_#in~s1#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc9#1.offset| 0) (= 0 |ULTIMATE.start_cstrspn_~s2#1.offset|) (= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 2 |ULTIMATE.start_cstrspn_~p~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 2 |ULTIMATE.start_main_#t~malloc8#1.base|) (<= 2 |ULTIMATE.start_cstrspn_#in~s2#1.base|) (<= (select |#length| |ULTIMATE.start_cstrspn_#t~post4#1.base|) |ULTIMATE.start_cstrspn_#t~post4#1.offset|) (<= 2 |ULTIMATE.start_cstrspn_~s1#1.base|) (<= 2 |ULTIMATE.start_main_~nondetString1~0#1.base|) (= |ULTIMATE.start_cstrspn_~s1#1.offset| 0) (= (+ |ULTIMATE.start_cstrspn_#t~post4#1.offset| 1) |ULTIMATE.start_cstrspn_~spanp~0#1.offset|) (<= 2 |ULTIMATE.start_cstrspn_#t~post4#1.base|))' at error location [2023-12-02 08:34:23,009 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 08:34:23,009 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 08:34:23,009 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 19, 19] total 45 [2023-12-02 08:34:23,009 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1811134633] [2023-12-02 08:34:23,009 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 08:34:23,010 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 45 states [2023-12-02 08:34:23,010 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 08:34:23,010 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2023-12-02 08:34:23,011 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=250, Invalid=2935, Unknown=7, NotChecked=0, Total=3192 [2023-12-02 08:34:23,011 INFO L87 Difference]: Start difference. First operand 224 states and 264 transitions. Second operand has 45 states, 45 states have (on average 1.7555555555555555) internal successors, (79), 45 states have internal predecessors, (79), 0 states have call successors, (0), 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 08:34:25,806 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 08:34:25,806 INFO L93 Difference]: Finished difference Result 383 states and 435 transitions. [2023-12-02 08:34:25,807 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2023-12-02 08:34:25,807 INFO L78 Accepts]: Start accepts. Automaton has has 45 states, 45 states have (on average 1.7555555555555555) internal successors, (79), 45 states have internal predecessors, (79), 0 states have call successors, (0), 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 31 [2023-12-02 08:34:25,807 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 08:34:25,809 INFO L225 Difference]: With dead ends: 383 [2023-12-02 08:34:25,809 INFO L226 Difference]: Without dead ends: 305 [2023-12-02 08:34:25,811 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 131 GetRequests, 51 SyntacticMatches, 1 SemanticMatches, 79 ConstructedPredicates, 0 IntricatePredicates, 3 DeprecatedPredicates, 1538 ImplicationChecksByTransitivity, 7.9s TimeCoverageRelationStatistics Valid=721, Invalid=5750, Unknown=9, NotChecked=0, Total=6480 [2023-12-02 08:34:25,812 INFO L413 NwaCegarLoop]: 17 mSDtfsCounter, 215 mSDsluCounter, 229 mSDsCounter, 0 mSdLazyCounter, 479 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 215 SdHoareTripleChecker+Valid, 246 SdHoareTripleChecker+Invalid, 480 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 479 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-12-02 08:34:25,812 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [215 Valid, 246 Invalid, 480 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 479 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-12-02 08:34:25,812 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 305 states. [2023-12-02 08:34:25,817 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 305 to 278. [2023-12-02 08:34:25,818 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 278 states, 276 states have (on average 1.181159420289855) internal successors, (326), 277 states have internal predecessors, (326), 0 states have call successors, (0), 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 08:34:25,819 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 278 states to 278 states and 326 transitions. [2023-12-02 08:34:25,819 INFO L78 Accepts]: Start accepts. Automaton has 278 states and 326 transitions. Word has length 31 [2023-12-02 08:34:25,819 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 08:34:25,819 INFO L495 AbstractCegarLoop]: Abstraction has 278 states and 326 transitions. [2023-12-02 08:34:25,819 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 45 states, 45 states have (on average 1.7555555555555555) internal successors, (79), 45 states have internal predecessors, (79), 0 states have call successors, (0), 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 08:34:25,819 INFO L276 IsEmpty]: Start isEmpty. Operand 278 states and 326 transitions. [2023-12-02 08:34:25,820 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2023-12-02 08:34:25,820 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 08:34:25,820 INFO L195 NwaCegarLoop]: trace histogram [4, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 08:34:25,826 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Ended with exit code 0 [2023-12-02 08:34:26,021 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable24 [2023-12-02 08:34:26,021 INFO L420 AbstractCegarLoop]: === Iteration 26 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 10 more)] === [2023-12-02 08:34:26,021 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 08:34:26,021 INFO L85 PathProgramCache]: Analyzing trace with hash -309509721, now seen corresponding path program 5 times [2023-12-02 08:34:26,022 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 08:34:26,022 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [225273493] [2023-12-02 08:34:26,022 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 08:34:26,022 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 08:34:26,035 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 08:34:26,264 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 1 proven. 32 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 08:34:26,264 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 08:34:26,265 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [225273493] [2023-12-02 08:34:26,265 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [225273493] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 08:34:26,265 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [10837124] [2023-12-02 08:34:26,265 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-12-02 08:34:26,265 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 08:34:26,265 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 08:34:26,266 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 08:34:26,272 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2023-12-02 08:34:26,444 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2023-12-02 08:34:26,444 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 08:34:26,446 INFO L262 TraceCheckSpWp]: Trace formula consists of 256 conjuncts, 41 conjunts are in the unsatisfiable core [2023-12-02 08:34:26,448 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 08:34:26,578 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 4 proven. 29 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 08:34:26,578 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 08:34:26,753 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 7 treesize of output 5 [2023-12-02 08:34:26,777 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 4 proven. 29 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 08:34:26,777 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [10837124] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 08:34:26,778 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [337502907] [2023-12-02 08:34:26,779 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2023-12-02 08:34:26,779 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 08:34:26,779 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 08:34:26,779 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 08:34:26,779 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 08:34:27,715 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 08:34:28,340 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '6381#(or (< (select |#length| |ULTIMATE.start_cstrspn_#t~post2#1.base|) (+ |ULTIMATE.start_cstrspn_#t~post2#1.offset| 1)) (< |ULTIMATE.start_cstrspn_#t~post2#1.offset| 0))' at error location [2023-12-02 08:34:28,340 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 08:34:28,340 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 08:34:28,341 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 24 [2023-12-02 08:34:28,341 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [812950944] [2023-12-02 08:34:28,341 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 08:34:28,341 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2023-12-02 08:34:28,341 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 08:34:28,342 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2023-12-02 08:34:28,342 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=120, Invalid=1212, Unknown=0, NotChecked=0, Total=1332 [2023-12-02 08:34:28,343 INFO L87 Difference]: Start difference. First operand 278 states and 326 transitions. Second operand has 26 states, 25 states have (on average 3.12) internal successors, (78), 25 states have internal predecessors, (78), 0 states have call successors, (0), 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 08:34:28,751 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 08:34:28,752 INFO L93 Difference]: Finished difference Result 332 states and 384 transitions. [2023-12-02 08:34:28,752 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2023-12-02 08:34:28,752 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 25 states have (on average 3.12) internal successors, (78), 25 states have internal predecessors, (78), 0 states have call successors, (0), 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 33 [2023-12-02 08:34:28,752 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 08:34:28,754 INFO L225 Difference]: With dead ends: 332 [2023-12-02 08:34:28,754 INFO L226 Difference]: Without dead ends: 332 [2023-12-02 08:34:28,755 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 118 GetRequests, 69 SyntacticMatches, 4 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 390 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=231, Invalid=1931, Unknown=0, NotChecked=0, Total=2162 [2023-12-02 08:34:28,755 INFO L413 NwaCegarLoop]: 16 mSDtfsCounter, 128 mSDsluCounter, 197 mSDsCounter, 0 mSdLazyCounter, 429 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 128 SdHoareTripleChecker+Valid, 213 SdHoareTripleChecker+Invalid, 429 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 429 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-12-02 08:34:28,755 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [128 Valid, 213 Invalid, 429 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 429 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-12-02 08:34:28,756 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 332 states. [2023-12-02 08:34:28,763 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 332 to 328. [2023-12-02 08:34:28,763 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 328 states, 326 states have (on average 1.177914110429448) internal successors, (384), 327 states have internal predecessors, (384), 0 states have call successors, (0), 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 08:34:28,765 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 328 states to 328 states and 384 transitions. [2023-12-02 08:34:28,765 INFO L78 Accepts]: Start accepts. Automaton has 328 states and 384 transitions. Word has length 33 [2023-12-02 08:34:28,765 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 08:34:28,765 INFO L495 AbstractCegarLoop]: Abstraction has 328 states and 384 transitions. [2023-12-02 08:34:28,765 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 25 states have (on average 3.12) internal successors, (78), 25 states have internal predecessors, (78), 0 states have call successors, (0), 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 08:34:28,765 INFO L276 IsEmpty]: Start isEmpty. Operand 328 states and 384 transitions. [2023-12-02 08:34:28,766 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2023-12-02 08:34:28,766 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 08:34:28,766 INFO L195 NwaCegarLoop]: trace histogram [5, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 08:34:28,771 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Ended with exit code 0 [2023-12-02 08:34:28,966 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable25 [2023-12-02 08:34:28,967 INFO L420 AbstractCegarLoop]: === Iteration 27 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 10 more)] === [2023-12-02 08:34:28,967 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 08:34:28,967 INFO L85 PathProgramCache]: Analyzing trace with hash -1961849874, now seen corresponding path program 7 times [2023-12-02 08:34:28,967 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 08:34:28,967 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1944004282] [2023-12-02 08:34:28,967 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 08:34:28,968 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 08:34:28,981 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 08:34:29,372 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 4 proven. 44 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 08:34:29,372 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 08:34:29,372 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1944004282] [2023-12-02 08:34:29,372 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1944004282] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 08:34:29,373 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [42186563] [2023-12-02 08:34:29,373 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-12-02 08:34:29,373 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 08:34:29,373 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 08:34:29,374 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 08:34:29,380 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2023-12-02 08:34:29,483 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 08:34:29,485 INFO L262 TraceCheckSpWp]: Trace formula consists of 235 conjuncts, 54 conjunts are in the unsatisfiable core [2023-12-02 08:34:29,486 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 08:34:29,665 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 9 proven. 39 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 08:34:29,665 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 08:34:29,892 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 5 treesize of output 3 [2023-12-02 08:34:29,961 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 9 proven. 39 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 08:34:29,962 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [42186563] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 08:34:29,962 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2024116966] [2023-12-02 08:34:29,963 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2023-12-02 08:34:29,963 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 08:34:29,963 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 08:34:29,963 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 08:34:29,963 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 08:34:30,559 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 08:34:31,948 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '7296#(and (<= 2 |ULTIMATE.start_cstrspn_~s2#1.base|) (= |ULTIMATE.start_cstrspn_#in~s2#1.offset| 0) (<= 2 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |ULTIMATE.start_main_#t~malloc8#1.offset| 0) (<= 0 |ULTIMATE.start_cstrspn_#t~post4#1.offset|) (<= 1 |#StackHeapBarrier|) (= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (= |ULTIMATE.start_main_~length1~0#1| 1) (= |ULTIMATE.start_cstrspn_~p~0#1.offset| 1) (= |ULTIMATE.start_cstrspn_~spanp~0#1.base| |ULTIMATE.start_cstrspn_#t~post4#1.base|) (<= 2 |ULTIMATE.start_main_#t~malloc9#1.base|) (<= 2 |ULTIMATE.start_cstrspn_#in~s1#1.base|) (= |ULTIMATE.start_cstrspn_#in~s1#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc9#1.offset| 0) (= 0 |ULTIMATE.start_cstrspn_~s2#1.offset|) (= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 2 |ULTIMATE.start_cstrspn_~p~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 2 |ULTIMATE.start_main_#t~malloc8#1.base|) (<= 2 |ULTIMATE.start_cstrspn_#in~s2#1.base|) (<= (select |#length| |ULTIMATE.start_cstrspn_#t~post4#1.base|) |ULTIMATE.start_cstrspn_#t~post4#1.offset|) (<= 2 |ULTIMATE.start_cstrspn_~s1#1.base|) (<= 2 |ULTIMATE.start_main_~nondetString1~0#1.base|) (= |ULTIMATE.start_cstrspn_~s1#1.offset| 0) (= (+ |ULTIMATE.start_cstrspn_#t~post4#1.offset| 1) |ULTIMATE.start_cstrspn_~spanp~0#1.offset|) (<= 2 |ULTIMATE.start_cstrspn_#t~post4#1.base|))' at error location [2023-12-02 08:34:31,948 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 08:34:31,948 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 08:34:31,949 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14, 14] total 31 [2023-12-02 08:34:31,949 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1521286852] [2023-12-02 08:34:31,949 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 08:34:31,949 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2023-12-02 08:34:31,949 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 08:34:31,950 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2023-12-02 08:34:31,951 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=162, Invalid=1728, Unknown=2, NotChecked=0, Total=1892 [2023-12-02 08:34:31,951 INFO L87 Difference]: Start difference. First operand 328 states and 384 transitions. Second operand has 32 states, 31 states have (on average 2.2903225806451615) internal successors, (71), 32 states have internal predecessors, (71), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 08:34:32,725 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 08:34:32,725 INFO L93 Difference]: Finished difference Result 416 states and 477 transitions. [2023-12-02 08:34:32,725 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2023-12-02 08:34:32,725 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 31 states have (on average 2.2903225806451615) internal successors, (71), 32 states have internal predecessors, (71), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 33 [2023-12-02 08:34:32,725 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 08:34:32,727 INFO L225 Difference]: With dead ends: 416 [2023-12-02 08:34:32,727 INFO L226 Difference]: Without dead ends: 416 [2023-12-02 08:34:32,729 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 125 GetRequests, 64 SyntacticMatches, 5 SemanticMatches, 56 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 977 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=347, Invalid=2957, Unknown=2, NotChecked=0, Total=3306 [2023-12-02 08:34:32,729 INFO L413 NwaCegarLoop]: 23 mSDtfsCounter, 166 mSDsluCounter, 300 mSDsCounter, 0 mSdLazyCounter, 648 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 166 SdHoareTripleChecker+Valid, 323 SdHoareTripleChecker+Invalid, 649 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 648 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-12-02 08:34:32,729 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [166 Valid, 323 Invalid, 649 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 648 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-12-02 08:34:32,730 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 416 states. [2023-12-02 08:34:32,738 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 416 to 356. [2023-12-02 08:34:32,738 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 356 states, 354 states have (on average 1.1807909604519775) internal successors, (418), 355 states have internal predecessors, (418), 0 states have call successors, (0), 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 08:34:32,740 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 356 states to 356 states and 418 transitions. [2023-12-02 08:34:32,740 INFO L78 Accepts]: Start accepts. Automaton has 356 states and 418 transitions. Word has length 33 [2023-12-02 08:34:32,740 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 08:34:32,740 INFO L495 AbstractCegarLoop]: Abstraction has 356 states and 418 transitions. [2023-12-02 08:34:32,740 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 31 states have (on average 2.2903225806451615) internal successors, (71), 32 states have internal predecessors, (71), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 08:34:32,740 INFO L276 IsEmpty]: Start isEmpty. Operand 356 states and 418 transitions. [2023-12-02 08:34:32,741 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2023-12-02 08:34:32,741 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 08:34:32,741 INFO L195 NwaCegarLoop]: trace histogram [6, 5, 5, 5, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 08:34:32,745 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2023-12-02 08:34:32,941 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable26,15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 08:34:32,942 INFO L420 AbstractCegarLoop]: === Iteration 28 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 10 more)] === [2023-12-02 08:34:32,942 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 08:34:32,942 INFO L85 PathProgramCache]: Analyzing trace with hash 949728242, now seen corresponding path program 8 times [2023-12-02 08:34:32,942 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 08:34:32,942 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1977648698] [2023-12-02 08:34:32,942 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 08:34:32,942 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 08:34:32,958 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 08:34:33,351 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 14 proven. 52 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 08:34:33,351 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 08:34:33,351 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1977648698] [2023-12-02 08:34:33,351 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1977648698] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 08:34:33,352 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [726416048] [2023-12-02 08:34:33,352 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-12-02 08:34:33,352 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 08:34:33,352 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 08:34:33,353 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 08:34:33,353 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2023-12-02 08:34:33,475 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2023-12-02 08:34:33,476 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 08:34:33,478 INFO L262 TraceCheckSpWp]: Trace formula consists of 253 conjuncts, 70 conjunts are in the unsatisfiable core [2023-12-02 08:34:33,480 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 08:34:33,569 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2023-12-02 08:34:33,623 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 14 proven. 52 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 08:34:33,624 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 08:34:33,654 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 13 [2023-12-02 08:34:33,655 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2023-12-02 08:34:33,703 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 14 proven. 52 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 08:34:33,703 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [726416048] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 08:34:33,703 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1180441822] [2023-12-02 08:34:33,704 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2023-12-02 08:34:33,704 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 08:34:33,705 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 08:34:33,705 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 08:34:33,705 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 08:34:34,287 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 08:34:35,782 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '8354#(and (<= 2 |ULTIMATE.start_cstrspn_~s2#1.base|) (= |ULTIMATE.start_cstrspn_#in~s2#1.offset| 0) (<= 2 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |ULTIMATE.start_main_#t~malloc8#1.offset| 0) (<= 0 |ULTIMATE.start_cstrspn_#t~post4#1.offset|) (<= 1 |#StackHeapBarrier|) (= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (= |ULTIMATE.start_main_~length1~0#1| 1) (= |ULTIMATE.start_cstrspn_~p~0#1.offset| 1) (= |ULTIMATE.start_cstrspn_~spanp~0#1.base| |ULTIMATE.start_cstrspn_#t~post4#1.base|) (<= 2 |ULTIMATE.start_main_#t~malloc9#1.base|) (<= 2 |ULTIMATE.start_cstrspn_#in~s1#1.base|) (= |ULTIMATE.start_cstrspn_#in~s1#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc9#1.offset| 0) (= 0 |ULTIMATE.start_cstrspn_~s2#1.offset|) (= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 2 |ULTIMATE.start_cstrspn_~p~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 2 |ULTIMATE.start_main_#t~malloc8#1.base|) (<= 2 |ULTIMATE.start_cstrspn_#in~s2#1.base|) (<= (select |#length| |ULTIMATE.start_cstrspn_#t~post4#1.base|) |ULTIMATE.start_cstrspn_#t~post4#1.offset|) (<= 2 |ULTIMATE.start_cstrspn_~s1#1.base|) (<= 2 |ULTIMATE.start_main_~nondetString1~0#1.base|) (= |ULTIMATE.start_cstrspn_~s1#1.offset| 0) (= (+ |ULTIMATE.start_cstrspn_#t~post4#1.offset| 1) |ULTIMATE.start_cstrspn_~spanp~0#1.offset|) (<= 2 |ULTIMATE.start_cstrspn_#t~post4#1.base|))' at error location [2023-12-02 08:34:35,782 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 08:34:35,782 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 08:34:35,783 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 17, 17] total 30 [2023-12-02 08:34:35,783 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1123789637] [2023-12-02 08:34:35,783 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 08:34:35,783 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 30 states [2023-12-02 08:34:35,783 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 08:34:35,783 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2023-12-02 08:34:35,784 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=141, Invalid=1578, Unknown=3, NotChecked=0, Total=1722 [2023-12-02 08:34:35,784 INFO L87 Difference]: Start difference. First operand 356 states and 418 transitions. Second operand has 30 states, 30 states have (on average 1.9) internal successors, (57), 30 states have internal predecessors, (57), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 08:34:36,338 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 08:34:36,339 INFO L93 Difference]: Finished difference Result 569 states and 652 transitions. [2023-12-02 08:34:36,339 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2023-12-02 08:34:36,339 INFO L78 Accepts]: Start accepts. Automaton has has 30 states, 30 states have (on average 1.9) internal successors, (57), 30 states have internal predecessors, (57), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 37 [2023-12-02 08:34:36,339 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 08:34:36,341 INFO L225 Difference]: With dead ends: 569 [2023-12-02 08:34:36,342 INFO L226 Difference]: Without dead ends: 472 [2023-12-02 08:34:36,342 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 141 GetRequests, 87 SyntacticMatches, 0 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 614 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=292, Invalid=2785, Unknown=3, NotChecked=0, Total=3080 [2023-12-02 08:34:36,343 INFO L413 NwaCegarLoop]: 30 mSDtfsCounter, 92 mSDsluCounter, 467 mSDsCounter, 0 mSdLazyCounter, 682 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 92 SdHoareTripleChecker+Valid, 497 SdHoareTripleChecker+Invalid, 686 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 682 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-12-02 08:34:36,343 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [92 Valid, 497 Invalid, 686 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 682 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-12-02 08:34:36,343 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 472 states. [2023-12-02 08:34:36,352 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 472 to 440. [2023-12-02 08:34:36,353 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 440 states, 438 states have (on average 1.178082191780822) internal successors, (516), 439 states have internal predecessors, (516), 0 states have call successors, (0), 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 08:34:36,354 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 440 states to 440 states and 516 transitions. [2023-12-02 08:34:36,355 INFO L78 Accepts]: Start accepts. Automaton has 440 states and 516 transitions. Word has length 37 [2023-12-02 08:34:36,355 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 08:34:36,355 INFO L495 AbstractCegarLoop]: Abstraction has 440 states and 516 transitions. [2023-12-02 08:34:36,355 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 30 states, 30 states have (on average 1.9) internal successors, (57), 30 states have internal predecessors, (57), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 08:34:36,355 INFO L276 IsEmpty]: Start isEmpty. Operand 440 states and 516 transitions. [2023-12-02 08:34:36,356 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2023-12-02 08:34:36,356 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 08:34:36,356 INFO L195 NwaCegarLoop]: trace histogram [5, 4, 4, 4, 4, 4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 08:34:36,361 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Ended with exit code 0 [2023-12-02 08:34:36,556 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable27,16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 08:34:36,557 INFO L420 AbstractCegarLoop]: === Iteration 29 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 10 more)] === [2023-12-02 08:34:36,557 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 08:34:36,557 INFO L85 PathProgramCache]: Analyzing trace with hash 307732813, now seen corresponding path program 6 times [2023-12-02 08:34:36,557 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 08:34:36,557 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2144830897] [2023-12-02 08:34:36,557 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 08:34:36,557 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 08:34:36,575 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 08:34:37,386 INFO L134 CoverageAnalysis]: Checked inductivity of 54 backedges. 8 proven. 45 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 08:34:37,386 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 08:34:37,386 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2144830897] [2023-12-02 08:34:37,386 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2144830897] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 08:34:37,386 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2110385386] [2023-12-02 08:34:37,387 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-12-02 08:34:37,387 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 08:34:37,387 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 08:34:37,388 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 08:34:37,392 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2023-12-02 08:34:37,529 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-12-02 08:34:37,529 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 08:34:37,533 INFO L262 TraceCheckSpWp]: Trace formula consists of 293 conjuncts, 125 conjunts are in the unsatisfiable core [2023-12-02 08:34:37,536 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 08:34:37,886 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2023-12-02 08:34:37,932 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 19 treesize of output 18 [2023-12-02 08:34:39,046 INFO L349 Elim1Store]: treesize reduction 13, result has 23.5 percent of original size [2023-12-02 08:34:39,046 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 5 select indices, 5 select index equivalence classes, 3 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 10 case distinctions, treesize of input 52 treesize of output 24 [2023-12-02 08:34:39,090 INFO L134 CoverageAnalysis]: Checked inductivity of 54 backedges. 8 proven. 46 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 08:34:39,090 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 08:34:39,889 INFO L349 Elim1Store]: treesize reduction 55, result has 42.1 percent of original size [2023-12-02 08:34:39,890 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 4 new quantified variables, introduced 7 case distinctions, treesize of input 495 treesize of output 375 [2023-12-02 08:34:39,910 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-12-02 08:34:39,911 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 83 treesize of output 75 [2023-12-02 08:34:39,924 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 94 treesize of output 86 [2023-12-02 08:34:39,961 INFO L173 IndexEqualityManager]: detected equality via solver [2023-12-02 08:34:39,965 INFO L173 IndexEqualityManager]: detected equality via solver [2023-12-02 08:34:39,965 INFO L173 IndexEqualityManager]: detected equality via solver [2023-12-02 08:34:39,986 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-12-02 08:34:39,987 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 5 select indices, 5 select index equivalence classes, 6 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 141 treesize of output 130 [2023-12-02 08:34:40,629 INFO L134 CoverageAnalysis]: Checked inductivity of 54 backedges. 26 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 08:34:40,629 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2110385386] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 08:34:40,629 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [589790328] [2023-12-02 08:34:40,631 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2023-12-02 08:34:40,631 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 08:34:40,631 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 08:34:40,631 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 08:34:40,631 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 08:34:41,531 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 08:34:42,765 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '9701#(or (< (select |#length| |ULTIMATE.start_cstrspn_#t~post2#1.base|) (+ |ULTIMATE.start_cstrspn_#t~post2#1.offset| 1)) (< |ULTIMATE.start_cstrspn_#t~post2#1.offset| 0))' at error location [2023-12-02 08:34:42,765 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 08:34:42,766 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 08:34:42,766 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 28, 28] total 69 [2023-12-02 08:34:42,766 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [859816461] [2023-12-02 08:34:42,766 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 08:34:42,766 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 70 states [2023-12-02 08:34:42,766 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 08:34:42,767 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 70 interpolants. [2023-12-02 08:34:42,768 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=338, Invalid=6142, Unknown=0, NotChecked=0, Total=6480 [2023-12-02 08:34:42,768 INFO L87 Difference]: Start difference. First operand 440 states and 516 transitions. Second operand has 70 states, 70 states have (on average 1.4428571428571428) internal successors, (101), 69 states have internal predecessors, (101), 0 states have call successors, (0), 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 08:34:58,595 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 08:34:58,595 INFO L93 Difference]: Finished difference Result 867 states and 1000 transitions. [2023-12-02 08:34:58,596 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 108 states. [2023-12-02 08:34:58,596 INFO L78 Accepts]: Start accepts. Automaton has has 70 states, 70 states have (on average 1.4428571428571428) internal successors, (101), 69 states have internal predecessors, (101), 0 states have call successors, (0), 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 39 [2023-12-02 08:34:58,596 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 08:34:58,600 INFO L225 Difference]: With dead ends: 867 [2023-12-02 08:34:58,600 INFO L226 Difference]: Without dead ends: 841 [2023-12-02 08:34:58,603 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 239 GetRequests, 57 SyntacticMatches, 0 SemanticMatches, 182 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8805 ImplicationChecksByTransitivity, 17.9s TimeCoverageRelationStatistics Valid=2925, Invalid=30747, Unknown=0, NotChecked=0, Total=33672 [2023-12-02 08:34:58,604 INFO L413 NwaCegarLoop]: 13 mSDtfsCounter, 797 mSDsluCounter, 389 mSDsCounter, 0 mSdLazyCounter, 1713 mSolverCounterSat, 28 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 797 SdHoareTripleChecker+Valid, 402 SdHoareTripleChecker+Invalid, 1741 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 28 IncrementalHoareTripleChecker+Valid, 1713 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.6s IncrementalHoareTripleChecker+Time [2023-12-02 08:34:58,604 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [797 Valid, 402 Invalid, 1741 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [28 Valid, 1713 Invalid, 0 Unknown, 0 Unchecked, 1.6s Time] [2023-12-02 08:34:58,605 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 841 states. [2023-12-02 08:34:58,619 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 841 to 683. [2023-12-02 08:34:58,620 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 683 states, 681 states have (on average 1.1747430249632893) internal successors, (800), 682 states have internal predecessors, (800), 0 states have call successors, (0), 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 08:34:58,622 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 683 states to 683 states and 800 transitions. [2023-12-02 08:34:58,623 INFO L78 Accepts]: Start accepts. Automaton has 683 states and 800 transitions. Word has length 39 [2023-12-02 08:34:58,623 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 08:34:58,623 INFO L495 AbstractCegarLoop]: Abstraction has 683 states and 800 transitions. [2023-12-02 08:34:58,623 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 70 states, 70 states have (on average 1.4428571428571428) internal successors, (101), 69 states have internal predecessors, (101), 0 states have call successors, (0), 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 08:34:58,623 INFO L276 IsEmpty]: Start isEmpty. Operand 683 states and 800 transitions. [2023-12-02 08:34:58,624 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2023-12-02 08:34:58,624 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 08:34:58,624 INFO L195 NwaCegarLoop]: trace histogram [6, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 08:34:58,630 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Ended with exit code 0 [2023-12-02 08:34:58,825 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable28 [2023-12-02 08:34:58,825 INFO L420 AbstractCegarLoop]: === Iteration 30 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 10 more)] === [2023-12-02 08:34:58,825 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 08:34:58,825 INFO L85 PathProgramCache]: Analyzing trace with hash 722761655, now seen corresponding path program 9 times [2023-12-02 08:34:58,825 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 08:34:58,825 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1258161695] [2023-12-02 08:34:58,826 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 08:34:58,826 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 08:34:58,867 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 08:34:59,290 INFO L134 CoverageAnalysis]: Checked inductivity of 75 backedges. 9 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 08:34:59,290 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 08:34:59,291 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1258161695] [2023-12-02 08:34:59,291 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1258161695] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 08:34:59,291 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1019826651] [2023-12-02 08:34:59,291 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-12-02 08:34:59,291 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 08:34:59,291 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 08:34:59,292 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 08:34:59,294 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2023-12-02 08:34:59,402 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-12-02 08:34:59,403 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 08:34:59,405 INFO L262 TraceCheckSpWp]: Trace formula consists of 266 conjuncts, 64 conjunts are in the unsatisfiable core [2023-12-02 08:34:59,407 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 08:34:59,410 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 08:34:59,631 INFO L134 CoverageAnalysis]: Checked inductivity of 75 backedges. 16 proven. 59 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 08:34:59,632 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 08:35:00,091 INFO L134 CoverageAnalysis]: Checked inductivity of 75 backedges. 16 proven. 59 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 08:35:00,092 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1019826651] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 08:35:00,092 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [213826504] [2023-12-02 08:35:00,093 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2023-12-02 08:35:00,093 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 08:35:00,093 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 08:35:00,093 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 08:35:00,093 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 08:35:00,746 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 08:35:02,351 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '11738#(and (<= 2 |ULTIMATE.start_cstrspn_~s2#1.base|) (= |ULTIMATE.start_cstrspn_#in~s2#1.offset| 0) (<= 2 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |ULTIMATE.start_main_#t~malloc8#1.offset| 0) (<= 0 |ULTIMATE.start_cstrspn_#t~post4#1.offset|) (<= 1 |#StackHeapBarrier|) (= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (= |ULTIMATE.start_main_~length1~0#1| 1) (= |ULTIMATE.start_cstrspn_~p~0#1.offset| 1) (= |ULTIMATE.start_cstrspn_~spanp~0#1.base| |ULTIMATE.start_cstrspn_#t~post4#1.base|) (<= 2 |ULTIMATE.start_main_#t~malloc9#1.base|) (<= 2 |ULTIMATE.start_cstrspn_#in~s1#1.base|) (= |ULTIMATE.start_cstrspn_#in~s1#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc9#1.offset| 0) (= 0 |ULTIMATE.start_cstrspn_~s2#1.offset|) (= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 2 |ULTIMATE.start_cstrspn_~p~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 2 |ULTIMATE.start_main_#t~malloc8#1.base|) (<= 2 |ULTIMATE.start_cstrspn_#in~s2#1.base|) (<= (select |#length| |ULTIMATE.start_cstrspn_#t~post4#1.base|) |ULTIMATE.start_cstrspn_#t~post4#1.offset|) (<= 2 |ULTIMATE.start_cstrspn_~s1#1.base|) (<= 2 |ULTIMATE.start_main_~nondetString1~0#1.base|) (= |ULTIMATE.start_cstrspn_~s1#1.offset| 0) (= (+ |ULTIMATE.start_cstrspn_#t~post4#1.offset| 1) |ULTIMATE.start_cstrspn_~spanp~0#1.offset|) (<= 2 |ULTIMATE.start_cstrspn_#t~post4#1.base|))' at error location [2023-12-02 08:35:02,351 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 08:35:02,351 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 08:35:02,352 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16, 16] total 41 [2023-12-02 08:35:02,352 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [500721269] [2023-12-02 08:35:02,352 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 08:35:02,352 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 42 states [2023-12-02 08:35:02,352 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 08:35:02,353 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2023-12-02 08:35:02,353 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=257, Invalid=2603, Unknown=2, NotChecked=0, Total=2862 [2023-12-02 08:35:02,353 INFO L87 Difference]: Start difference. First operand 683 states and 800 transitions. Second operand has 42 states, 41 states have (on average 2.341463414634146) internal successors, (96), 42 states have internal predecessors, (96), 0 states have call successors, (0), 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 08:35:03,209 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 08:35:03,209 INFO L93 Difference]: Finished difference Result 829 states and 954 transitions. [2023-12-02 08:35:03,209 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2023-12-02 08:35:03,209 INFO L78 Accepts]: Start accepts. Automaton has has 42 states, 41 states have (on average 2.341463414634146) internal successors, (96), 42 states have internal predecessors, (96), 0 states have call successors, (0), 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 39 [2023-12-02 08:35:03,210 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 08:35:03,214 INFO L225 Difference]: With dead ends: 829 [2023-12-02 08:35:03,214 INFO L226 Difference]: Without dead ends: 829 [2023-12-02 08:35:03,215 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 147 GetRequests, 79 SyntacticMatches, 0 SemanticMatches, 68 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1304 ImplicationChecksByTransitivity, 2.7s TimeCoverageRelationStatistics Valid=500, Invalid=4328, Unknown=2, NotChecked=0, Total=4830 [2023-12-02 08:35:03,216 INFO L413 NwaCegarLoop]: 31 mSDtfsCounter, 173 mSDsluCounter, 364 mSDsCounter, 0 mSdLazyCounter, 770 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 173 SdHoareTripleChecker+Valid, 395 SdHoareTripleChecker+Invalid, 771 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 770 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2023-12-02 08:35:03,216 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [173 Valid, 395 Invalid, 771 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 770 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2023-12-02 08:35:03,217 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 829 states. [2023-12-02 08:35:03,231 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 829 to 723. [2023-12-02 08:35:03,232 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 723 states, 721 states have (on average 1.1775312066574202) internal successors, (849), 722 states have internal predecessors, (849), 0 states have call successors, (0), 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 08:35:03,234 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 723 states to 723 states and 849 transitions. [2023-12-02 08:35:03,234 INFO L78 Accepts]: Start accepts. Automaton has 723 states and 849 transitions. Word has length 39 [2023-12-02 08:35:03,235 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 08:35:03,235 INFO L495 AbstractCegarLoop]: Abstraction has 723 states and 849 transitions. [2023-12-02 08:35:03,235 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 42 states, 41 states have (on average 2.341463414634146) internal successors, (96), 42 states have internal predecessors, (96), 0 states have call successors, (0), 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 08:35:03,235 INFO L276 IsEmpty]: Start isEmpty. Operand 723 states and 849 transitions. [2023-12-02 08:35:03,237 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2023-12-02 08:35:03,237 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 08:35:03,237 INFO L195 NwaCegarLoop]: trace histogram [5, 4, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 08:35:03,248 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Ended with exit code 0 [2023-12-02 08:35:03,448 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29,18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 08:35:03,448 INFO L420 AbstractCegarLoop]: === Iteration 31 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 10 more)] === [2023-12-02 08:35:03,449 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 08:35:03,449 INFO L85 PathProgramCache]: Analyzing trace with hash 2035792443, now seen corresponding path program 7 times [2023-12-02 08:35:03,449 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 08:35:03,449 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1109646705] [2023-12-02 08:35:03,449 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 08:35:03,449 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 08:35:03,464 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 08:35:03,762 INFO L134 CoverageAnalysis]: Checked inductivity of 61 backedges. 4 proven. 56 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 08:35:03,762 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 08:35:03,762 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1109646705] [2023-12-02 08:35:03,762 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1109646705] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 08:35:03,762 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1934362334] [2023-12-02 08:35:03,762 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-12-02 08:35:03,763 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 08:35:03,763 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 08:35:03,764 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 08:35:03,766 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2023-12-02 08:35:03,891 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 08:35:03,894 INFO L262 TraceCheckSpWp]: Trace formula consists of 306 conjuncts, 54 conjunts are in the unsatisfiable core [2023-12-02 08:35:03,896 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 08:35:04,014 INFO L134 CoverageAnalysis]: Checked inductivity of 61 backedges. 9 proven. 51 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 08:35:04,015 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 08:35:04,254 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 5 treesize of output 3 [2023-12-02 08:35:04,291 INFO L134 CoverageAnalysis]: Checked inductivity of 61 backedges. 9 proven. 51 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 08:35:04,291 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1934362334] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 08:35:04,291 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [643464234] [2023-12-02 08:35:04,293 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2023-12-02 08:35:04,293 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 08:35:04,293 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 08:35:04,293 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 08:35:04,293 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 08:35:05,446 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 08:35:07,004 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '13599#(and (<= 0 |ULTIMATE.start_cstrspn_#t~post2#1.offset|) (or (and (= |ULTIMATE.start_cstrspn_#in~s2#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc8#1.offset| 0) (= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (= |ULTIMATE.start_cstrspn_#in~s1#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc9#1.offset| 0) (= 0 |ULTIMATE.start_cstrspn_~s2#1.offset|) (= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (= |ULTIMATE.start_cstrspn_~s1#1.offset| 0) (= |ULTIMATE.start_cstrspn_~spanp~0#1.offset| 1)) (and (= |ULTIMATE.start_cstrspn_#in~s2#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc8#1.offset| 0) (= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (= |ULTIMATE.start_cstrspn_~p~0#1.offset| 1) (= |ULTIMATE.start_cstrspn_#in~s1#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc9#1.offset| 0) (= 0 |ULTIMATE.start_cstrspn_~s2#1.offset|) (= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (= |ULTIMATE.start_cstrspn_~s1#1.offset| 0) (= |ULTIMATE.start_cstrspn_#t~post2#1.offset| 0))) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 1 |ULTIMATE.start_cstrspn_~p~0#1.offset|) (<= (select |#length| |ULTIMATE.start_cstrspn_#t~post2#1.base|) |ULTIMATE.start_cstrspn_#t~post2#1.offset|))' at error location [2023-12-02 08:35:07,004 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 08:35:07,004 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 08:35:07,004 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 23 [2023-12-02 08:35:07,004 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [126487970] [2023-12-02 08:35:07,005 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 08:35:07,005 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2023-12-02 08:35:07,005 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 08:35:07,005 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2023-12-02 08:35:07,005 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=115, Invalid=1291, Unknown=0, NotChecked=0, Total=1406 [2023-12-02 08:35:07,005 INFO L87 Difference]: Start difference. First operand 723 states and 849 transitions. Second operand has 25 states, 24 states have (on average 3.0833333333333335) internal successors, (74), 24 states have internal predecessors, (74), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 08:35:07,550 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 08:35:07,550 INFO L93 Difference]: Finished difference Result 875 states and 1025 transitions. [2023-12-02 08:35:07,550 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2023-12-02 08:35:07,550 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 24 states have (on average 3.0833333333333335) internal successors, (74), 24 states have internal predecessors, (74), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 41 [2023-12-02 08:35:07,551 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 08:35:07,554 INFO L225 Difference]: With dead ends: 875 [2023-12-02 08:35:07,555 INFO L226 Difference]: Without dead ends: 875 [2023-12-02 08:35:07,555 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 146 GetRequests, 93 SyntacticMatches, 5 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 482 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=224, Invalid=2226, Unknown=0, NotChecked=0, Total=2450 [2023-12-02 08:35:07,555 INFO L413 NwaCegarLoop]: 21 mSDtfsCounter, 156 mSDsluCounter, 293 mSDsCounter, 0 mSdLazyCounter, 653 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 156 SdHoareTripleChecker+Valid, 314 SdHoareTripleChecker+Invalid, 653 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 653 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-12-02 08:35:07,556 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [156 Valid, 314 Invalid, 653 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 653 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-12-02 08:35:07,556 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 875 states. [2023-12-02 08:35:07,567 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 875 to 799. [2023-12-02 08:35:07,569 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 799 states, 797 states have (on average 1.176913425345044) internal successors, (938), 798 states have internal predecessors, (938), 0 states have call successors, (0), 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 08:35:07,571 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 799 states to 799 states and 938 transitions. [2023-12-02 08:35:07,571 INFO L78 Accepts]: Start accepts. Automaton has 799 states and 938 transitions. Word has length 41 [2023-12-02 08:35:07,572 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 08:35:07,572 INFO L495 AbstractCegarLoop]: Abstraction has 799 states and 938 transitions. [2023-12-02 08:35:07,572 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 24 states have (on average 3.0833333333333335) internal successors, (74), 24 states have internal predecessors, (74), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 08:35:07,572 INFO L276 IsEmpty]: Start isEmpty. Operand 799 states and 938 transitions. [2023-12-02 08:35:07,573 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2023-12-02 08:35:07,573 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 08:35:07,574 INFO L195 NwaCegarLoop]: trace histogram [7, 6, 6, 6, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 08:35:07,580 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Ended with exit code 0 [2023-12-02 08:35:07,776 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30,19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 08:35:07,776 INFO L420 AbstractCegarLoop]: === Iteration 32 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 10 more)] === [2023-12-02 08:35:07,776 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 08:35:07,776 INFO L85 PathProgramCache]: Analyzing trace with hash 432182075, now seen corresponding path program 10 times [2023-12-02 08:35:07,776 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 08:35:07,777 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [644422981] [2023-12-02 08:35:07,777 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 08:35:07,777 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 08:35:07,791 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 08:35:08,277 INFO L134 CoverageAnalysis]: Checked inductivity of 97 backedges. 17 proven. 80 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 08:35:08,277 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 08:35:08,277 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [644422981] [2023-12-02 08:35:08,277 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [644422981] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 08:35:08,277 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1537363022] [2023-12-02 08:35:08,277 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-12-02 08:35:08,277 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 08:35:08,278 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 08:35:08,278 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 08:35:08,279 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2023-12-02 08:35:08,385 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 08:35:08,388 INFO L262 TraceCheckSpWp]: Trace formula consists of 284 conjuncts, 80 conjunts are in the unsatisfiable core [2023-12-02 08:35:08,389 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 08:35:08,505 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2023-12-02 08:35:08,574 INFO L134 CoverageAnalysis]: Checked inductivity of 97 backedges. 17 proven. 80 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 08:35:08,575 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 08:35:08,616 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 13 [2023-12-02 08:35:08,617 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2023-12-02 08:35:08,679 INFO L134 CoverageAnalysis]: Checked inductivity of 97 backedges. 17 proven. 80 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 08:35:08,679 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1537363022] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 08:35:08,680 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [306823279] [2023-12-02 08:35:08,681 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2023-12-02 08:35:08,681 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 08:35:08,681 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 08:35:08,681 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 08:35:08,681 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 08:35:09,305 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 08:35:10,872 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '15595#(and (<= 2 |ULTIMATE.start_cstrspn_~s2#1.base|) (= |ULTIMATE.start_cstrspn_#in~s2#1.offset| 0) (<= 2 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |ULTIMATE.start_main_#t~malloc8#1.offset| 0) (<= 0 |ULTIMATE.start_cstrspn_#t~post4#1.offset|) (<= 1 |#StackHeapBarrier|) (= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (= |ULTIMATE.start_main_~length1~0#1| 1) (= |ULTIMATE.start_cstrspn_~p~0#1.offset| 1) (= |ULTIMATE.start_cstrspn_~spanp~0#1.base| |ULTIMATE.start_cstrspn_#t~post4#1.base|) (<= 2 |ULTIMATE.start_main_#t~malloc9#1.base|) (<= 2 |ULTIMATE.start_cstrspn_#in~s1#1.base|) (= |ULTIMATE.start_cstrspn_#in~s1#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc9#1.offset| 0) (= 0 |ULTIMATE.start_cstrspn_~s2#1.offset|) (= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 2 |ULTIMATE.start_cstrspn_~p~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 2 |ULTIMATE.start_main_#t~malloc8#1.base|) (<= 2 |ULTIMATE.start_cstrspn_#in~s2#1.base|) (<= (select |#length| |ULTIMATE.start_cstrspn_#t~post4#1.base|) |ULTIMATE.start_cstrspn_#t~post4#1.offset|) (<= 2 |ULTIMATE.start_cstrspn_~s1#1.base|) (<= 2 |ULTIMATE.start_main_~nondetString1~0#1.base|) (= |ULTIMATE.start_cstrspn_~s1#1.offset| 0) (= (+ |ULTIMATE.start_cstrspn_#t~post4#1.offset| 1) |ULTIMATE.start_cstrspn_~spanp~0#1.offset|) (<= 2 |ULTIMATE.start_cstrspn_#t~post4#1.base|))' at error location [2023-12-02 08:35:10,872 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 08:35:10,872 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 08:35:10,873 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 19, 19] total 33 [2023-12-02 08:35:10,873 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [524076471] [2023-12-02 08:35:10,873 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 08:35:10,873 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 33 states [2023-12-02 08:35:10,873 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 08:35:10,874 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2023-12-02 08:35:10,874 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=149, Invalid=1829, Unknown=2, NotChecked=0, Total=1980 [2023-12-02 08:35:10,874 INFO L87 Difference]: Start difference. First operand 799 states and 938 transitions. Second operand has 33 states, 33 states have (on average 1.9696969696969697) internal successors, (65), 33 states have internal predecessors, (65), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 08:35:11,572 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 08:35:11,573 INFO L93 Difference]: Finished difference Result 1196 states and 1379 transitions. [2023-12-02 08:35:11,573 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2023-12-02 08:35:11,573 INFO L78 Accepts]: Start accepts. Automaton has has 33 states, 33 states have (on average 1.9696969696969697) internal successors, (65), 33 states have internal predecessors, (65), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 43 [2023-12-02 08:35:11,573 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 08:35:11,578 INFO L225 Difference]: With dead ends: 1196 [2023-12-02 08:35:11,578 INFO L226 Difference]: Without dead ends: 1071 [2023-12-02 08:35:11,578 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 163 GetRequests, 104 SyntacticMatches, 0 SemanticMatches, 59 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 722 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=319, Invalid=3339, Unknown=2, NotChecked=0, Total=3660 [2023-12-02 08:35:11,578 INFO L413 NwaCegarLoop]: 36 mSDtfsCounter, 212 mSDsluCounter, 617 mSDsCounter, 0 mSdLazyCounter, 881 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 212 SdHoareTripleChecker+Valid, 653 SdHoareTripleChecker+Invalid, 886 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 881 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-12-02 08:35:11,579 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [212 Valid, 653 Invalid, 886 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 881 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-12-02 08:35:11,580 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1071 states. [2023-12-02 08:35:11,592 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1071 to 997. [2023-12-02 08:35:11,594 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 997 states, 995 states have (on average 1.1768844221105528) internal successors, (1171), 996 states have internal predecessors, (1171), 0 states have call successors, (0), 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 08:35:11,596 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 997 states to 997 states and 1171 transitions. [2023-12-02 08:35:11,597 INFO L78 Accepts]: Start accepts. Automaton has 997 states and 1171 transitions. Word has length 43 [2023-12-02 08:35:11,597 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 08:35:11,597 INFO L495 AbstractCegarLoop]: Abstraction has 997 states and 1171 transitions. [2023-12-02 08:35:11,597 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 33 states, 33 states have (on average 1.9696969696969697) internal successors, (65), 33 states have internal predecessors, (65), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 08:35:11,597 INFO L276 IsEmpty]: Start isEmpty. Operand 997 states and 1171 transitions. [2023-12-02 08:35:11,599 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2023-12-02 08:35:11,599 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 08:35:11,600 INFO L195 NwaCegarLoop]: trace histogram [5, 5, 5, 5, 4, 4, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 08:35:11,606 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Ended with exit code 0 [2023-12-02 08:35:11,802 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31,20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 08:35:11,802 INFO L420 AbstractCegarLoop]: === Iteration 33 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 10 more)] === [2023-12-02 08:35:11,803 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 08:35:11,803 INFO L85 PathProgramCache]: Analyzing trace with hash -708302314, now seen corresponding path program 1 times [2023-12-02 08:35:11,803 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 08:35:11,803 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [644789109] [2023-12-02 08:35:11,803 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 08:35:11,803 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 08:35:11,831 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 08:35:13,135 INFO L134 CoverageAnalysis]: Checked inductivity of 73 backedges. 8 proven. 62 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2023-12-02 08:35:13,135 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 08:35:13,135 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [644789109] [2023-12-02 08:35:13,135 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [644789109] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 08:35:13,135 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [302208648] [2023-12-02 08:35:13,135 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 08:35:13,135 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 08:35:13,135 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 08:35:13,136 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 08:35:13,137 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2023-12-02 08:35:13,257 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 08:35:13,260 INFO L262 TraceCheckSpWp]: Trace formula consists of 324 conjuncts, 65 conjunts are in the unsatisfiable core [2023-12-02 08:35:13,262 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 08:35:13,265 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2023-12-02 08:35:13,478 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 13 treesize of output 9 [2023-12-02 08:35:13,519 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 18 treesize of output 13 [2023-12-02 08:35:13,584 INFO L134 CoverageAnalysis]: Checked inductivity of 73 backedges. 9 proven. 57 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2023-12-02 08:35:13,584 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 08:35:13,619 WARN L854 $PredicateComparison]: unable to prove that (forall ((v_ArrVal_659 (Array Int Int))) (= (select (select (store |c_#memory_int| |c_ULTIMATE.start_main_~nondetString2~0#1.base| v_ArrVal_659) |c_ULTIMATE.start_main_~nondetString1~0#1.base|) (+ 3 |c_ULTIMATE.start_main_~nondetString1~0#1.offset|)) 0)) is different from false [2023-12-02 08:35:13,623 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-12-02 08:35:13,624 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 23 treesize of output 24 [2023-12-02 08:35:13,630 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-12-02 08:35:13,630 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 37 treesize of output 32 [2023-12-02 08:35:13,739 INFO L134 CoverageAnalysis]: Checked inductivity of 73 backedges. 8 proven. 58 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2023-12-02 08:35:13,740 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [302208648] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 08:35:13,740 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1026384049] [2023-12-02 08:35:13,741 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2023-12-02 08:35:13,741 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 08:35:13,741 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 08:35:13,741 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 08:35:13,741 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 08:35:15,104 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 08:35:15,832 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '18128#(or (< (select |#length| |ULTIMATE.start_cstrspn_#t~post2#1.base|) (+ |ULTIMATE.start_cstrspn_#t~post2#1.offset| 1)) (< |ULTIMATE.start_cstrspn_#t~post2#1.offset| 0))' at error location [2023-12-02 08:35:15,832 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 08:35:15,832 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 08:35:15,832 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 15, 15] total 31 [2023-12-02 08:35:15,832 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [550838611] [2023-12-02 08:35:15,832 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 08:35:15,832 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2023-12-02 08:35:15,833 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 08:35:15,833 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2023-12-02 08:35:15,833 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=99, Invalid=1544, Unknown=1, NotChecked=78, Total=1722 [2023-12-02 08:35:15,833 INFO L87 Difference]: Start difference. First operand 997 states and 1171 transitions. Second operand has 32 states, 32 states have (on average 2.03125) internal successors, (65), 31 states have internal predecessors, (65), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 08:35:18,709 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 08:35:18,709 INFO L93 Difference]: Finished difference Result 1064 states and 1231 transitions. [2023-12-02 08:35:18,710 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2023-12-02 08:35:18,710 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 32 states have (on average 2.03125) internal successors, (65), 31 states have internal predecessors, (65), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 45 [2023-12-02 08:35:18,710 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 08:35:18,713 INFO L225 Difference]: With dead ends: 1064 [2023-12-02 08:35:18,713 INFO L226 Difference]: Without dead ends: 800 [2023-12-02 08:35:18,714 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 191 GetRequests, 114 SyntacticMatches, 0 SemanticMatches, 77 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 982 ImplicationChecksByTransitivity, 3.6s TimeCoverageRelationStatistics Valid=473, Invalid=5536, Unknown=1, NotChecked=152, Total=6162 [2023-12-02 08:35:18,715 INFO L413 NwaCegarLoop]: 30 mSDtfsCounter, 227 mSDsluCounter, 549 mSDsCounter, 0 mSdLazyCounter, 1071 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 227 SdHoareTripleChecker+Valid, 579 SdHoareTripleChecker+Invalid, 1192 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 1071 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 110 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2023-12-02 08:35:18,715 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [227 Valid, 579 Invalid, 1192 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 1071 Invalid, 0 Unknown, 110 Unchecked, 0.7s Time] [2023-12-02 08:35:18,716 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 800 states. [2023-12-02 08:35:18,724 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 800 to 711. [2023-12-02 08:35:18,725 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 711 states, 709 states have (on average 1.1805359661495063) internal successors, (837), 710 states have internal predecessors, (837), 0 states have call successors, (0), 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 08:35:18,726 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 711 states to 711 states and 837 transitions. [2023-12-02 08:35:18,726 INFO L78 Accepts]: Start accepts. Automaton has 711 states and 837 transitions. Word has length 45 [2023-12-02 08:35:18,726 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 08:35:18,726 INFO L495 AbstractCegarLoop]: Abstraction has 711 states and 837 transitions. [2023-12-02 08:35:18,726 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 32 states have (on average 2.03125) internal successors, (65), 31 states have internal predecessors, (65), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 08:35:18,726 INFO L276 IsEmpty]: Start isEmpty. Operand 711 states and 837 transitions. [2023-12-02 08:35:18,728 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2023-12-02 08:35:18,728 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 08:35:18,728 INFO L195 NwaCegarLoop]: trace histogram [7, 6, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 08:35:18,733 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Ended with exit code 0 [2023-12-02 08:35:18,928 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable32 [2023-12-02 08:35:18,928 INFO L420 AbstractCegarLoop]: === Iteration 34 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 10 more)] === [2023-12-02 08:35:18,928 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 08:35:18,929 INFO L85 PathProgramCache]: Analyzing trace with hash 1720233792, now seen corresponding path program 11 times [2023-12-02 08:35:18,929 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 08:35:18,929 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1773386034] [2023-12-02 08:35:18,929 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 08:35:18,929 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 08:35:18,942 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 08:35:19,409 INFO L134 CoverageAnalysis]: Checked inductivity of 108 backedges. 16 proven. 92 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 08:35:19,409 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 08:35:19,409 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1773386034] [2023-12-02 08:35:19,410 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1773386034] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 08:35:19,410 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1558988567] [2023-12-02 08:35:19,410 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-12-02 08:35:19,410 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 08:35:19,410 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 08:35:19,411 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 08:35:19,412 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Waiting until timeout for monitored process [2023-12-02 08:35:19,636 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 7 check-sat command(s) [2023-12-02 08:35:19,637 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 08:35:19,639 INFO L262 TraceCheckSpWp]: Trace formula consists of 297 conjuncts, 62 conjunts are in the unsatisfiable core [2023-12-02 08:35:19,640 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 08:35:20,006 INFO L134 CoverageAnalysis]: Checked inductivity of 108 backedges. 25 proven. 83 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 08:35:20,006 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 08:35:20,370 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 7 treesize of output 5 [2023-12-02 08:35:20,484 INFO L134 CoverageAnalysis]: Checked inductivity of 108 backedges. 25 proven. 83 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 08:35:20,484 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1558988567] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 08:35:20,484 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1775907872] [2023-12-02 08:35:20,485 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2023-12-02 08:35:20,486 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 08:35:20,486 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 08:35:20,486 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 08:35:20,486 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 08:35:21,111 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 08:35:22,726 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '20298#(and (<= 2 |ULTIMATE.start_cstrspn_~s2#1.base|) (= |ULTIMATE.start_cstrspn_#in~s2#1.offset| 0) (<= 2 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |ULTIMATE.start_main_#t~malloc8#1.offset| 0) (<= 0 |ULTIMATE.start_cstrspn_#t~post4#1.offset|) (<= 1 |#StackHeapBarrier|) (= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (= |ULTIMATE.start_main_~length1~0#1| 1) (= |ULTIMATE.start_cstrspn_~p~0#1.offset| 1) (= |ULTIMATE.start_cstrspn_~spanp~0#1.base| |ULTIMATE.start_cstrspn_#t~post4#1.base|) (<= 2 |ULTIMATE.start_main_#t~malloc9#1.base|) (<= 2 |ULTIMATE.start_cstrspn_#in~s1#1.base|) (= |ULTIMATE.start_cstrspn_#in~s1#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc9#1.offset| 0) (= 0 |ULTIMATE.start_cstrspn_~s2#1.offset|) (= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 2 |ULTIMATE.start_cstrspn_~p~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 2 |ULTIMATE.start_main_#t~malloc8#1.base|) (<= 2 |ULTIMATE.start_cstrspn_#in~s2#1.base|) (<= (select |#length| |ULTIMATE.start_cstrspn_#t~post4#1.base|) |ULTIMATE.start_cstrspn_#t~post4#1.offset|) (<= 2 |ULTIMATE.start_cstrspn_~s1#1.base|) (<= 2 |ULTIMATE.start_main_~nondetString1~0#1.base|) (= |ULTIMATE.start_cstrspn_~s1#1.offset| 0) (= (+ |ULTIMATE.start_cstrspn_#t~post4#1.offset| 1) |ULTIMATE.start_cstrspn_~spanp~0#1.offset|) (<= 2 |ULTIMATE.start_cstrspn_#t~post4#1.base|))' at error location [2023-12-02 08:35:22,726 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 08:35:22,726 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 08:35:22,726 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18, 18] total 46 [2023-12-02 08:35:22,726 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1507216477] [2023-12-02 08:35:22,727 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 08:35:22,727 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 47 states [2023-12-02 08:35:22,727 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 08:35:22,728 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2023-12-02 08:35:22,728 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=339, Invalid=3080, Unknown=3, NotChecked=0, Total=3422 [2023-12-02 08:35:22,728 INFO L87 Difference]: Start difference. First operand 711 states and 837 transitions. Second operand has 47 states, 46 states have (on average 2.5869565217391304) internal successors, (119), 47 states have internal predecessors, (119), 0 states have call successors, (0), 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 08:35:23,725 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 08:35:23,725 INFO L93 Difference]: Finished difference Result 859 states and 992 transitions. [2023-12-02 08:35:23,725 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2023-12-02 08:35:23,725 INFO L78 Accepts]: Start accepts. Automaton has has 47 states, 46 states have (on average 2.5869565217391304) internal successors, (119), 47 states have internal predecessors, (119), 0 states have call successors, (0), 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 45 [2023-12-02 08:35:23,726 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 08:35:23,728 INFO L225 Difference]: With dead ends: 859 [2023-12-02 08:35:23,729 INFO L226 Difference]: Without dead ends: 859 [2023-12-02 08:35:23,729 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 169 GetRequests, 87 SyntacticMatches, 7 SemanticMatches, 75 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1970 ImplicationChecksByTransitivity, 3.0s TimeCoverageRelationStatistics Valid=669, Invalid=5180, Unknown=3, NotChecked=0, Total=5852 [2023-12-02 08:35:23,729 INFO L413 NwaCegarLoop]: 35 mSDtfsCounter, 203 mSDsluCounter, 506 mSDsCounter, 0 mSdLazyCounter, 969 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 203 SdHoareTripleChecker+Valid, 541 SdHoareTripleChecker+Invalid, 970 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 969 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2023-12-02 08:35:23,730 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [203 Valid, 541 Invalid, 970 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 969 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2023-12-02 08:35:23,730 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 859 states. [2023-12-02 08:35:23,740 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 859 to 747. [2023-12-02 08:35:23,741 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 747 states, 745 states have (on average 1.1825503355704698) internal successors, (881), 746 states have internal predecessors, (881), 0 states have call successors, (0), 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 08:35:23,743 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 747 states to 747 states and 881 transitions. [2023-12-02 08:35:23,743 INFO L78 Accepts]: Start accepts. Automaton has 747 states and 881 transitions. Word has length 45 [2023-12-02 08:35:23,743 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 08:35:23,744 INFO L495 AbstractCegarLoop]: Abstraction has 747 states and 881 transitions. [2023-12-02 08:35:23,744 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 47 states, 46 states have (on average 2.5869565217391304) internal successors, (119), 47 states have internal predecessors, (119), 0 states have call successors, (0), 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 08:35:23,744 INFO L276 IsEmpty]: Start isEmpty. Operand 747 states and 881 transitions. [2023-12-02 08:35:23,745 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2023-12-02 08:35:23,745 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 08:35:23,745 INFO L195 NwaCegarLoop]: trace histogram [6, 5, 5, 5, 5, 5, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 08:35:23,752 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Ended with exit code 0 [2023-12-02 08:35:23,946 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable33 [2023-12-02 08:35:23,946 INFO L420 AbstractCegarLoop]: === Iteration 35 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 10 more)] === [2023-12-02 08:35:23,946 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 08:35:23,946 INFO L85 PathProgramCache]: Analyzing trace with hash -1618847007, now seen corresponding path program 8 times [2023-12-02 08:35:23,946 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 08:35:23,946 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2006048584] [2023-12-02 08:35:23,946 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 08:35:23,946 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 08:35:23,970 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 08:35:24,700 INFO L134 CoverageAnalysis]: Checked inductivity of 87 backedges. 10 proven. 76 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 08:35:24,700 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 08:35:24,701 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2006048584] [2023-12-02 08:35:24,701 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2006048584] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 08:35:24,701 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [62586998] [2023-12-02 08:35:24,701 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-12-02 08:35:24,701 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 08:35:24,701 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 08:35:24,702 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 08:35:24,703 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Waiting until timeout for monitored process [2023-12-02 08:35:24,860 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2023-12-02 08:35:24,861 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 08:35:24,863 INFO L262 TraceCheckSpWp]: Trace formula consists of 343 conjuncts, 86 conjunts are in the unsatisfiable core [2023-12-02 08:35:24,865 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 08:35:24,870 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2023-12-02 08:35:24,972 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 08:35:24,982 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 08:35:25,244 INFO L134 CoverageAnalysis]: Checked inductivity of 87 backedges. 10 proven. 76 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 08:35:25,245 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 08:35:25,451 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-12-02 08:35:25,452 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 23 treesize of output 24 [2023-12-02 08:35:25,457 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-12-02 08:35:25,460 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 37 treesize of output 32 [2023-12-02 08:35:25,467 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 7 treesize of output 3 [2023-12-02 08:35:25,725 INFO L134 CoverageAnalysis]: Checked inductivity of 87 backedges. 10 proven. 76 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 08:35:25,725 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [62586998] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 08:35:25,725 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1636919146] [2023-12-02 08:35:25,726 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2023-12-02 08:35:25,726 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 08:35:25,726 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 08:35:25,727 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 08:35:25,727 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 08:35:26,651 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 08:35:27,665 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '22273#(or (< (select |#length| |ULTIMATE.start_cstrspn_#t~post2#1.base|) (+ |ULTIMATE.start_cstrspn_#t~post2#1.offset| 1)) (< |ULTIMATE.start_cstrspn_#t~post2#1.offset| 0))' at error location [2023-12-02 08:35:27,665 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 08:35:27,665 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 08:35:27,665 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 17, 17] total 44 [2023-12-02 08:35:27,665 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [940408771] [2023-12-02 08:35:27,665 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 08:35:27,666 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 45 states [2023-12-02 08:35:27,666 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 08:35:27,666 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2023-12-02 08:35:27,667 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=148, Invalid=2927, Unknown=5, NotChecked=0, Total=3080 [2023-12-02 08:35:27,667 INFO L87 Difference]: Start difference. First operand 747 states and 881 transitions. Second operand has 45 states, 45 states have (on average 2.6) internal successors, (117), 44 states have internal predecessors, (117), 0 states have call successors, (0), 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 08:35:29,302 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 08:35:29,303 INFO L93 Difference]: Finished difference Result 1295 states and 1499 transitions. [2023-12-02 08:35:29,303 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2023-12-02 08:35:29,303 INFO L78 Accepts]: Start accepts. Automaton has has 45 states, 45 states have (on average 2.6) internal successors, (117), 44 states have internal predecessors, (117), 0 states have call successors, (0), 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 47 [2023-12-02 08:35:29,303 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 08:35:29,307 INFO L225 Difference]: With dead ends: 1295 [2023-12-02 08:35:29,307 INFO L226 Difference]: Without dead ends: 931 [2023-12-02 08:35:29,308 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 188 GetRequests, 108 SyntacticMatches, 0 SemanticMatches, 80 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1115 ImplicationChecksByTransitivity, 2.9s TimeCoverageRelationStatistics Valid=459, Invalid=6178, Unknown=5, NotChecked=0, Total=6642 [2023-12-02 08:35:29,308 INFO L413 NwaCegarLoop]: 27 mSDtfsCounter, 246 mSDsluCounter, 648 mSDsCounter, 0 mSdLazyCounter, 1429 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 246 SdHoareTripleChecker+Valid, 675 SdHoareTripleChecker+Invalid, 1437 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 1429 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2023-12-02 08:35:29,308 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [246 Valid, 675 Invalid, 1437 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 1429 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2023-12-02 08:35:29,309 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 931 states. [2023-12-02 08:35:29,318 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 931 to 796. [2023-12-02 08:35:29,318 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 796 states, 794 states have (on average 1.1838790931989924) internal successors, (940), 795 states have internal predecessors, (940), 0 states have call successors, (0), 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 08:35:29,320 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 796 states to 796 states and 940 transitions. [2023-12-02 08:35:29,320 INFO L78 Accepts]: Start accepts. Automaton has 796 states and 940 transitions. Word has length 47 [2023-12-02 08:35:29,320 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 08:35:29,320 INFO L495 AbstractCegarLoop]: Abstraction has 796 states and 940 transitions. [2023-12-02 08:35:29,320 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 45 states, 45 states have (on average 2.6) internal successors, (117), 44 states have internal predecessors, (117), 0 states have call successors, (0), 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 08:35:29,320 INFO L276 IsEmpty]: Start isEmpty. Operand 796 states and 940 transitions. [2023-12-02 08:35:29,321 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2023-12-02 08:35:29,321 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 08:35:29,321 INFO L195 NwaCegarLoop]: trace histogram [6, 5, 5, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 08:35:29,327 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Ended with exit code 0 [2023-12-02 08:35:29,521 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable34,23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 08:35:29,522 INFO L420 AbstractCegarLoop]: === Iteration 36 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 10 more)] === [2023-12-02 08:35:29,522 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 08:35:29,522 INFO L85 PathProgramCache]: Analyzing trace with hash 1216980431, now seen corresponding path program 9 times [2023-12-02 08:35:29,522 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 08:35:29,522 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [474081929] [2023-12-02 08:35:29,522 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 08:35:29,522 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 08:35:29,536 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 08:35:29,854 INFO L134 CoverageAnalysis]: Checked inductivity of 96 backedges. 9 proven. 86 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 08:35:29,855 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 08:35:29,855 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [474081929] [2023-12-02 08:35:29,855 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [474081929] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 08:35:29,855 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [470176615] [2023-12-02 08:35:29,855 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-12-02 08:35:29,855 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 08:35:29,855 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 08:35:29,856 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 08:35:29,857 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Waiting until timeout for monitored process [2023-12-02 08:35:30,019 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-12-02 08:35:30,019 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 08:35:30,022 INFO L262 TraceCheckSpWp]: Trace formula consists of 356 conjuncts, 63 conjunts are in the unsatisfiable core [2023-12-02 08:35:30,024 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 08:35:30,152 INFO L134 CoverageAnalysis]: Checked inductivity of 96 backedges. 16 proven. 79 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 08:35:30,152 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 08:35:30,422 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 5 treesize of output 3 [2023-12-02 08:35:30,459 INFO L134 CoverageAnalysis]: Checked inductivity of 96 backedges. 16 proven. 79 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 08:35:30,459 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [470176615] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 08:35:30,459 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1486309940] [2023-12-02 08:35:30,460 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2023-12-02 08:35:30,460 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 08:35:30,461 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 08:35:30,461 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 08:35:30,461 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 08:35:31,357 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 08:35:32,098 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '24743#(or (< (select |#length| |ULTIMATE.start_cstrspn_#t~post2#1.base|) (+ |ULTIMATE.start_cstrspn_#t~post2#1.offset| 1)) (< |ULTIMATE.start_cstrspn_#t~post2#1.offset| 0))' at error location [2023-12-02 08:35:32,098 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 08:35:32,098 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 08:35:32,104 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15] total 26 [2023-12-02 08:35:32,104 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1556572024] [2023-12-02 08:35:32,105 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 08:35:32,105 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 28 states [2023-12-02 08:35:32,105 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 08:35:32,106 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2023-12-02 08:35:32,106 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=113, Invalid=1369, Unknown=0, NotChecked=0, Total=1482 [2023-12-02 08:35:32,106 INFO L87 Difference]: Start difference. First operand 796 states and 940 transitions. Second operand has 28 states, 27 states have (on average 3.259259259259259) internal successors, (88), 27 states have internal predecessors, (88), 0 states have call successors, (0), 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 08:35:32,748 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 08:35:32,748 INFO L93 Difference]: Finished difference Result 904 states and 1060 transitions. [2023-12-02 08:35:32,749 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2023-12-02 08:35:32,749 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 27 states have (on average 3.259259259259259) internal successors, (88), 27 states have internal predecessors, (88), 0 states have call successors, (0), 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 49 [2023-12-02 08:35:32,749 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 08:35:32,753 INFO L225 Difference]: With dead ends: 904 [2023-12-02 08:35:32,753 INFO L226 Difference]: Without dead ends: 904 [2023-12-02 08:35:32,753 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 174 GetRequests, 117 SyntacticMatches, 6 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 483 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=248, Invalid=2508, Unknown=0, NotChecked=0, Total=2756 [2023-12-02 08:35:32,753 INFO L413 NwaCegarLoop]: 24 mSDtfsCounter, 180 mSDsluCounter, 285 mSDsCounter, 0 mSdLazyCounter, 662 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 180 SdHoareTripleChecker+Valid, 309 SdHoareTripleChecker+Invalid, 662 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 662 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-12-02 08:35:32,753 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [180 Valid, 309 Invalid, 662 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 662 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-12-02 08:35:32,754 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 904 states. [2023-12-02 08:35:32,763 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 904 to 898. [2023-12-02 08:35:32,764 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 898 states, 896 states have (on average 1.1830357142857142) internal successors, (1060), 897 states have internal predecessors, (1060), 0 states have call successors, (0), 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 08:35:32,765 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 898 states to 898 states and 1060 transitions. [2023-12-02 08:35:32,765 INFO L78 Accepts]: Start accepts. Automaton has 898 states and 1060 transitions. Word has length 49 [2023-12-02 08:35:32,765 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 08:35:32,765 INFO L495 AbstractCegarLoop]: Abstraction has 898 states and 1060 transitions. [2023-12-02 08:35:32,765 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 28 states, 27 states have (on average 3.259259259259259) internal successors, (88), 27 states have internal predecessors, (88), 0 states have call successors, (0), 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 08:35:32,765 INFO L276 IsEmpty]: Start isEmpty. Operand 898 states and 1060 transitions. [2023-12-02 08:35:32,767 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2023-12-02 08:35:32,767 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 08:35:32,767 INFO L195 NwaCegarLoop]: trace histogram [8, 7, 7, 7, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 08:35:32,772 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Ended with exit code 0 [2023-12-02 08:35:32,967 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable35,24 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 08:35:32,967 INFO L420 AbstractCegarLoop]: === Iteration 37 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 10 more)] === [2023-12-02 08:35:32,968 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 08:35:32,968 INFO L85 PathProgramCache]: Analyzing trace with hash -1982996924, now seen corresponding path program 12 times [2023-12-02 08:35:32,968 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 08:35:32,968 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1575274992] [2023-12-02 08:35:32,968 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 08:35:32,968 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 08:35:32,983 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 08:35:33,468 INFO L134 CoverageAnalysis]: Checked inductivity of 134 backedges. 20 proven. 114 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 08:35:33,468 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 08:35:33,468 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1575274992] [2023-12-02 08:35:33,468 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1575274992] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 08:35:33,468 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2119847325] [2023-12-02 08:35:33,468 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-12-02 08:35:33,468 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 08:35:33,468 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 08:35:33,469 INFO L229 MonitoredProcess]: Starting monitored process 25 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 08:35:33,470 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Waiting until timeout for monitored process [2023-12-02 08:35:33,614 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-12-02 08:35:33,614 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 08:35:33,617 INFO L262 TraceCheckSpWp]: Trace formula consists of 315 conjuncts, 92 conjunts are in the unsatisfiable core [2023-12-02 08:35:33,620 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 08:35:33,788 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2023-12-02 08:35:34,554 INFO L349 Elim1Store]: treesize reduction 9, result has 47.1 percent of original size [2023-12-02 08:35:34,554 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 28 treesize of output 18 [2023-12-02 08:35:34,557 INFO L134 CoverageAnalysis]: Checked inductivity of 134 backedges. 22 proven. 112 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 08:35:34,557 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 08:35:35,034 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 27 [2023-12-02 08:35:35,037 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-12-02 08:35:35,037 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 31 treesize of output 23 [2023-12-02 08:35:35,189 INFO L134 CoverageAnalysis]: Checked inductivity of 134 backedges. 24 proven. 110 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 08:35:35,189 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2119847325] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 08:35:35,190 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [699156344] [2023-12-02 08:35:35,191 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2023-12-02 08:35:35,191 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 08:35:35,191 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 08:35:35,191 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 08:35:35,191 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 08:35:35,839 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 08:35:37,723 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '26927#(and (<= 2 |ULTIMATE.start_cstrspn_~s2#1.base|) (= |ULTIMATE.start_cstrspn_#in~s2#1.offset| 0) (<= 2 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |ULTIMATE.start_main_#t~malloc8#1.offset| 0) (<= 0 |ULTIMATE.start_cstrspn_#t~post4#1.offset|) (<= 1 |#StackHeapBarrier|) (= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (= |ULTIMATE.start_main_~length1~0#1| 1) (= |ULTIMATE.start_cstrspn_~p~0#1.offset| 1) (= |ULTIMATE.start_cstrspn_~spanp~0#1.base| |ULTIMATE.start_cstrspn_#t~post4#1.base|) (<= 2 |ULTIMATE.start_main_#t~malloc9#1.base|) (<= 2 |ULTIMATE.start_cstrspn_#in~s1#1.base|) (= |ULTIMATE.start_cstrspn_#in~s1#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc9#1.offset| 0) (= 0 |ULTIMATE.start_cstrspn_~s2#1.offset|) (= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 2 |ULTIMATE.start_cstrspn_~p~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 2 |ULTIMATE.start_main_#t~malloc8#1.base|) (<= 2 |ULTIMATE.start_cstrspn_#in~s2#1.base|) (<= (select |#length| |ULTIMATE.start_cstrspn_#t~post4#1.base|) |ULTIMATE.start_cstrspn_#t~post4#1.offset|) (<= 2 |ULTIMATE.start_cstrspn_~s1#1.base|) (<= 2 |ULTIMATE.start_main_~nondetString1~0#1.base|) (= |ULTIMATE.start_cstrspn_~s1#1.offset| 0) (= (+ |ULTIMATE.start_cstrspn_#t~post4#1.offset| 1) |ULTIMATE.start_cstrspn_~spanp~0#1.offset|) (<= 2 |ULTIMATE.start_cstrspn_#t~post4#1.base|))' at error location [2023-12-02 08:35:37,723 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 08:35:37,723 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 08:35:37,723 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 23, 23] total 55 [2023-12-02 08:35:37,723 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1561887209] [2023-12-02 08:35:37,724 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 08:35:37,724 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 55 states [2023-12-02 08:35:37,724 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 08:35:37,725 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 55 interpolants. [2023-12-02 08:35:37,725 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=259, Invalid=4160, Unknown=3, NotChecked=0, Total=4422 [2023-12-02 08:35:37,725 INFO L87 Difference]: Start difference. First operand 898 states and 1060 transitions. Second operand has 55 states, 55 states have (on average 2.272727272727273) internal successors, (125), 55 states have internal predecessors, (125), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 08:35:40,185 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 08:35:40,185 INFO L93 Difference]: Finished difference Result 1416 states and 1632 transitions. [2023-12-02 08:35:40,186 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2023-12-02 08:35:40,186 INFO L78 Accepts]: Start accepts. Automaton has has 55 states, 55 states have (on average 2.272727272727273) internal successors, (125), 55 states have internal predecessors, (125), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 49 [2023-12-02 08:35:40,186 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 08:35:40,190 INFO L225 Difference]: With dead ends: 1416 [2023-12-02 08:35:40,191 INFO L226 Difference]: Without dead ends: 1195 [2023-12-02 08:35:40,191 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 196 GetRequests, 101 SyntacticMatches, 1 SemanticMatches, 94 ConstructedPredicates, 0 IntricatePredicates, 7 DeprecatedPredicates, 2349 ImplicationChecksByTransitivity, 4.9s TimeCoverageRelationStatistics Valid=709, Invalid=8408, Unknown=3, NotChecked=0, Total=9120 [2023-12-02 08:35:40,191 INFO L413 NwaCegarLoop]: 42 mSDtfsCounter, 322 mSDsluCounter, 910 mSDsCounter, 0 mSdLazyCounter, 1357 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 322 SdHoareTripleChecker+Valid, 952 SdHoareTripleChecker+Invalid, 1362 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 1357 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2023-12-02 08:35:40,192 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [322 Valid, 952 Invalid, 1362 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 1357 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2023-12-02 08:35:40,193 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1195 states. [2023-12-02 08:35:40,207 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1195 to 1070. [2023-12-02 08:35:40,208 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1070 states, 1068 states have (on average 1.1835205992509363) internal successors, (1264), 1069 states have internal predecessors, (1264), 0 states have call successors, (0), 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 08:35:40,211 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1070 states to 1070 states and 1264 transitions. [2023-12-02 08:35:40,211 INFO L78 Accepts]: Start accepts. Automaton has 1070 states and 1264 transitions. Word has length 49 [2023-12-02 08:35:40,211 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 08:35:40,211 INFO L495 AbstractCegarLoop]: Abstraction has 1070 states and 1264 transitions. [2023-12-02 08:35:40,211 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 55 states, 55 states have (on average 2.272727272727273) internal successors, (125), 55 states have internal predecessors, (125), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 08:35:40,211 INFO L276 IsEmpty]: Start isEmpty. Operand 1070 states and 1264 transitions. [2023-12-02 08:35:40,213 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2023-12-02 08:35:40,213 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 08:35:40,213 INFO L195 NwaCegarLoop]: trace histogram [8, 7, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 08:35:40,219 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Ended with exit code 0 [2023-12-02 08:35:40,413 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable36,25 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 08:35:40,414 INFO L420 AbstractCegarLoop]: === Iteration 38 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 10 more)] === [2023-12-02 08:35:40,414 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 08:35:40,414 INFO L85 PathProgramCache]: Analyzing trace with hash -519167351, now seen corresponding path program 13 times [2023-12-02 08:35:40,414 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 08:35:40,414 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1531499582] [2023-12-02 08:35:40,414 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 08:35:40,414 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 08:35:40,428 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 08:35:40,935 INFO L134 CoverageAnalysis]: Checked inductivity of 147 backedges. 25 proven. 122 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 08:35:40,936 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 08:35:40,936 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1531499582] [2023-12-02 08:35:40,936 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1531499582] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 08:35:40,936 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1614325444] [2023-12-02 08:35:40,936 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-12-02 08:35:40,936 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 08:35:40,936 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 08:35:40,937 INFO L229 MonitoredProcess]: Starting monitored process 26 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 08:35:40,939 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Waiting until timeout for monitored process [2023-12-02 08:35:41,071 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 08:35:41,074 INFO L262 TraceCheckSpWp]: Trace formula consists of 328 conjuncts, 81 conjunts are in the unsatisfiable core [2023-12-02 08:35:41,077 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 08:35:41,363 INFO L134 CoverageAnalysis]: Checked inductivity of 147 backedges. 36 proven. 111 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 08:35:41,363 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 08:35:41,758 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 5 treesize of output 3 [2023-12-02 08:35:41,880 INFO L134 CoverageAnalysis]: Checked inductivity of 147 backedges. 36 proven. 111 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 08:35:41,881 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1614325444] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 08:35:41,881 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [758116787] [2023-12-02 08:35:41,882 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2023-12-02 08:35:41,882 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 08:35:41,882 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 08:35:41,882 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 08:35:41,882 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 08:35:42,478 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 08:35:44,019 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '29827#(and (<= 2 |ULTIMATE.start_cstrspn_~s2#1.base|) (= |ULTIMATE.start_cstrspn_#in~s2#1.offset| 0) (<= 2 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |ULTIMATE.start_main_#t~malloc8#1.offset| 0) (<= 0 |ULTIMATE.start_cstrspn_#t~post4#1.offset|) (<= 1 |#StackHeapBarrier|) (= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (= |ULTIMATE.start_main_~length1~0#1| 1) (= |ULTIMATE.start_cstrspn_~p~0#1.offset| 1) (= |ULTIMATE.start_cstrspn_~spanp~0#1.base| |ULTIMATE.start_cstrspn_#t~post4#1.base|) (<= 2 |ULTIMATE.start_main_#t~malloc9#1.base|) (<= 2 |ULTIMATE.start_cstrspn_#in~s1#1.base|) (= |ULTIMATE.start_cstrspn_#in~s1#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc9#1.offset| 0) (= 0 |ULTIMATE.start_cstrspn_~s2#1.offset|) (= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 2 |ULTIMATE.start_cstrspn_~p~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 2 |ULTIMATE.start_main_#t~malloc8#1.base|) (<= 2 |ULTIMATE.start_cstrspn_#in~s2#1.base|) (<= (select |#length| |ULTIMATE.start_cstrspn_#t~post4#1.base|) |ULTIMATE.start_cstrspn_#t~post4#1.offset|) (<= 2 |ULTIMATE.start_cstrspn_~s1#1.base|) (<= 2 |ULTIMATE.start_main_~nondetString1~0#1.base|) (= |ULTIMATE.start_cstrspn_~s1#1.offset| 0) (= (+ |ULTIMATE.start_cstrspn_#t~post4#1.offset| 1) |ULTIMATE.start_cstrspn_~spanp~0#1.offset|) (<= 2 |ULTIMATE.start_cstrspn_#t~post4#1.base|))' at error location [2023-12-02 08:35:44,019 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 08:35:44,019 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 08:35:44,019 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20, 20] total 43 [2023-12-02 08:35:44,019 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [833362470] [2023-12-02 08:35:44,019 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 08:35:44,019 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 44 states [2023-12-02 08:35:44,019 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 08:35:44,020 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2023-12-02 08:35:44,020 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=269, Invalid=2808, Unknown=3, NotChecked=0, Total=3080 [2023-12-02 08:35:44,020 INFO L87 Difference]: Start difference. First operand 1070 states and 1264 transitions. Second operand has 44 states, 43 states have (on average 2.488372093023256) internal successors, (107), 44 states have internal predecessors, (107), 0 states have call successors, (0), 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 08:35:45,040 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 08:35:45,040 INFO L93 Difference]: Finished difference Result 1273 states and 1476 transitions. [2023-12-02 08:35:45,040 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2023-12-02 08:35:45,041 INFO L78 Accepts]: Start accepts. Automaton has has 44 states, 43 states have (on average 2.488372093023256) internal successors, (107), 44 states have internal predecessors, (107), 0 states have call successors, (0), 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 51 [2023-12-02 08:35:45,041 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 08:35:45,046 INFO L225 Difference]: With dead ends: 1273 [2023-12-02 08:35:45,046 INFO L226 Difference]: Without dead ends: 1273 [2023-12-02 08:35:45,046 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 191 GetRequests, 109 SyntacticMatches, 8 SemanticMatches, 74 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1842 ImplicationChecksByTransitivity, 2.8s TimeCoverageRelationStatistics Valid=572, Invalid=5125, Unknown=3, NotChecked=0, Total=5700 [2023-12-02 08:35:45,046 INFO L413 NwaCegarLoop]: 39 mSDtfsCounter, 262 mSDsluCounter, 566 mSDsCounter, 0 mSdLazyCounter, 1071 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 262 SdHoareTripleChecker+Valid, 605 SdHoareTripleChecker+Invalid, 1072 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 1071 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2023-12-02 08:35:45,047 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [262 Valid, 605 Invalid, 1072 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 1071 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2023-12-02 08:35:45,047 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1273 states. [2023-12-02 08:35:45,058 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1273 to 1114. [2023-12-02 08:35:45,059 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1114 states, 1112 states have (on average 1.185251798561151) internal successors, (1318), 1113 states have internal predecessors, (1318), 0 states have call successors, (0), 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 08:35:45,061 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1114 states to 1114 states and 1318 transitions. [2023-12-02 08:35:45,061 INFO L78 Accepts]: Start accepts. Automaton has 1114 states and 1318 transitions. Word has length 51 [2023-12-02 08:35:45,061 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 08:35:45,061 INFO L495 AbstractCegarLoop]: Abstraction has 1114 states and 1318 transitions. [2023-12-02 08:35:45,061 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 44 states, 43 states have (on average 2.488372093023256) internal successors, (107), 44 states have internal predecessors, (107), 0 states have call successors, (0), 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 08:35:45,061 INFO L276 IsEmpty]: Start isEmpty. Operand 1114 states and 1318 transitions. [2023-12-02 08:35:45,062 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2023-12-02 08:35:45,062 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 08:35:45,062 INFO L195 NwaCegarLoop]: trace histogram [7, 6, 6, 6, 6, 6, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 08:35:45,067 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Ended with exit code 0 [2023-12-02 08:35:45,263 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable37 [2023-12-02 08:35:45,263 INFO L420 AbstractCegarLoop]: === Iteration 39 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 10 more)] === [2023-12-02 08:35:45,263 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 08:35:45,263 INFO L85 PathProgramCache]: Analyzing trace with hash 1936869237, now seen corresponding path program 10 times [2023-12-02 08:35:45,263 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 08:35:45,263 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2076268018] [2023-12-02 08:35:45,263 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 08:35:45,264 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 08:35:45,283 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 08:35:45,987 INFO L134 CoverageAnalysis]: Checked inductivity of 128 backedges. 12 proven. 115 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 08:35:45,987 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 08:35:45,988 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2076268018] [2023-12-02 08:35:45,988 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2076268018] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 08:35:45,988 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1847094787] [2023-12-02 08:35:45,988 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-12-02 08:35:45,988 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 08:35:45,988 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 08:35:45,989 INFO L229 MonitoredProcess]: Starting monitored process 27 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 08:35:45,989 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Waiting until timeout for monitored process [2023-12-02 08:35:46,134 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 08:35:46,138 INFO L262 TraceCheckSpWp]: Trace formula consists of 393 conjuncts, 89 conjunts are in the unsatisfiable core [2023-12-02 08:35:46,140 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 08:35:46,144 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2023-12-02 08:35:46,215 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 13 treesize of output 9 [2023-12-02 08:35:46,225 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 18 treesize of output 13 [2023-12-02 08:35:46,367 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 7 treesize of output 3 [2023-12-02 08:35:46,415 INFO L134 CoverageAnalysis]: Checked inductivity of 128 backedges. 12 proven. 115 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 08:35:46,415 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 08:35:46,489 WARN L854 $PredicateComparison]: unable to prove that (forall ((v_ArrVal_907 (Array Int Int))) (= (select (select (store |c_#memory_int| |c_ULTIMATE.start_main_~nondetString2~0#1.base| v_ArrVal_907) |c_ULTIMATE.start_main_~nondetString1~0#1.base|) (+ 5 |c_ULTIMATE.start_main_~nondetString1~0#1.offset|)) 0)) is different from false [2023-12-02 08:35:46,495 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-12-02 08:35:46,495 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 23 treesize of output 24 [2023-12-02 08:35:46,501 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-12-02 08:35:46,502 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 37 treesize of output 32 [2023-12-02 08:35:46,624 INFO L134 CoverageAnalysis]: Checked inductivity of 128 backedges. 12 proven. 115 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 08:35:46,625 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1847094787] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 08:35:46,625 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [142635498] [2023-12-02 08:35:46,626 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2023-12-02 08:35:46,626 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 08:35:46,626 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 08:35:46,626 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 08:35:46,626 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 08:35:47,573 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 08:35:48,504 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '32627#(or (< (select |#length| |ULTIMATE.start_cstrspn_#t~post2#1.base|) (+ |ULTIMATE.start_cstrspn_#t~post2#1.offset| 1)) (< |ULTIMATE.start_cstrspn_#t~post2#1.offset| 0))' at error location [2023-12-02 08:35:48,504 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 08:35:48,504 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 08:35:48,505 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 19, 19] total 36 [2023-12-02 08:35:48,505 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1991336148] [2023-12-02 08:35:48,505 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 08:35:48,505 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 37 states [2023-12-02 08:35:48,505 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 08:35:48,506 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2023-12-02 08:35:48,506 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=116, Invalid=2049, Unknown=1, NotChecked=90, Total=2256 [2023-12-02 08:35:48,506 INFO L87 Difference]: Start difference. First operand 1114 states and 1318 transitions. Second operand has 37 states, 37 states have (on average 2.5945945945945947) internal successors, (96), 36 states have internal predecessors, (96), 0 states have call successors, (0), 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 08:35:50,108 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 08:35:50,108 INFO L93 Difference]: Finished difference Result 1950 states and 2271 transitions. [2023-12-02 08:35:50,108 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2023-12-02 08:35:50,108 INFO L78 Accepts]: Start accepts. Automaton has has 37 states, 37 states have (on average 2.5945945945945947) internal successors, (96), 36 states have internal predecessors, (96), 0 states have call successors, (0), 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 55 [2023-12-02 08:35:50,109 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 08:35:50,114 INFO L225 Difference]: With dead ends: 1950 [2023-12-02 08:35:50,114 INFO L226 Difference]: Without dead ends: 1357 [2023-12-02 08:35:50,114 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 217 GetRequests, 142 SyntacticMatches, 0 SemanticMatches, 75 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 829 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=386, Invalid=5317, Unknown=1, NotChecked=148, Total=5852 [2023-12-02 08:35:50,115 INFO L413 NwaCegarLoop]: 33 mSDtfsCounter, 218 mSDsluCounter, 671 mSDsCounter, 0 mSdLazyCounter, 1447 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 218 SdHoareTripleChecker+Valid, 704 SdHoareTripleChecker+Invalid, 1556 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 1447 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 100 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2023-12-02 08:35:50,115 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [218 Valid, 704 Invalid, 1556 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 1447 Invalid, 0 Unknown, 100 Unchecked, 0.6s Time] [2023-12-02 08:35:50,116 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1357 states. [2023-12-02 08:35:50,129 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1357 to 1169. [2023-12-02 08:35:50,129 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1169 states, 1167 states have (on average 1.1859468723221938) internal successors, (1384), 1168 states have internal predecessors, (1384), 0 states have call successors, (0), 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 08:35:50,131 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1169 states to 1169 states and 1384 transitions. [2023-12-02 08:35:50,131 INFO L78 Accepts]: Start accepts. Automaton has 1169 states and 1384 transitions. Word has length 55 [2023-12-02 08:35:50,131 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 08:35:50,131 INFO L495 AbstractCegarLoop]: Abstraction has 1169 states and 1384 transitions. [2023-12-02 08:35:50,131 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 37 states, 37 states have (on average 2.5945945945945947) internal successors, (96), 36 states have internal predecessors, (96), 0 states have call successors, (0), 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 08:35:50,132 INFO L276 IsEmpty]: Start isEmpty. Operand 1169 states and 1384 transitions. [2023-12-02 08:35:50,133 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2023-12-02 08:35:50,133 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 08:35:50,133 INFO L195 NwaCegarLoop]: trace histogram [9, 8, 8, 8, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 08:35:50,138 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Ended with exit code 0 [2023-12-02 08:35:50,333 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable38 [2023-12-02 08:35:50,333 INFO L420 AbstractCegarLoop]: === Iteration 40 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 10 more)] === [2023-12-02 08:35:50,334 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 08:35:50,334 INFO L85 PathProgramCache]: Analyzing trace with hash -1838775027, now seen corresponding path program 14 times [2023-12-02 08:35:50,334 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 08:35:50,334 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [749101981] [2023-12-02 08:35:50,334 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 08:35:50,334 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 08:35:50,351 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 08:35:50,896 INFO L134 CoverageAnalysis]: Checked inductivity of 177 backedges. 23 proven. 154 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 08:35:50,896 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 08:35:50,896 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [749101981] [2023-12-02 08:35:50,896 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [749101981] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 08:35:50,896 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1578894819] [2023-12-02 08:35:50,896 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-12-02 08:35:50,896 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 08:35:50,896 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 08:35:50,897 INFO L229 MonitoredProcess]: Starting monitored process 28 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 08:35:50,898 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Waiting until timeout for monitored process [2023-12-02 08:35:51,078 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2023-12-02 08:35:51,078 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 08:35:51,081 INFO L262 TraceCheckSpWp]: Trace formula consists of 346 conjuncts, 100 conjunts are in the unsatisfiable core [2023-12-02 08:35:51,083 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 08:35:51,252 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2023-12-02 08:35:51,335 INFO L134 CoverageAnalysis]: Checked inductivity of 177 backedges. 23 proven. 154 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 08:35:51,335 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 08:35:51,376 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 13 [2023-12-02 08:35:51,377 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2023-12-02 08:35:51,452 INFO L134 CoverageAnalysis]: Checked inductivity of 177 backedges. 23 proven. 154 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 08:35:51,453 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1578894819] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 08:35:51,453 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [318932756] [2023-12-02 08:35:51,454 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2023-12-02 08:35:51,454 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 08:35:51,454 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 08:35:51,454 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 08:35:51,454 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 08:35:52,060 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 08:35:53,713 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '36178#(and (<= 2 |ULTIMATE.start_cstrspn_~s2#1.base|) (= |ULTIMATE.start_cstrspn_#in~s2#1.offset| 0) (<= 2 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |ULTIMATE.start_main_#t~malloc8#1.offset| 0) (<= 0 |ULTIMATE.start_cstrspn_#t~post4#1.offset|) (<= 1 |#StackHeapBarrier|) (= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (= |ULTIMATE.start_main_~length1~0#1| 1) (= |ULTIMATE.start_cstrspn_~p~0#1.offset| 1) (= |ULTIMATE.start_cstrspn_~spanp~0#1.base| |ULTIMATE.start_cstrspn_#t~post4#1.base|) (<= 2 |ULTIMATE.start_main_#t~malloc9#1.base|) (<= 2 |ULTIMATE.start_cstrspn_#in~s1#1.base|) (= |ULTIMATE.start_cstrspn_#in~s1#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc9#1.offset| 0) (= 0 |ULTIMATE.start_cstrspn_~s2#1.offset|) (= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 2 |ULTIMATE.start_cstrspn_~p~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 2 |ULTIMATE.start_main_#t~malloc8#1.base|) (<= 2 |ULTIMATE.start_cstrspn_#in~s2#1.base|) (<= (select |#length| |ULTIMATE.start_cstrspn_#t~post4#1.base|) |ULTIMATE.start_cstrspn_#t~post4#1.offset|) (<= 2 |ULTIMATE.start_cstrspn_~s1#1.base|) (<= 2 |ULTIMATE.start_main_~nondetString1~0#1.base|) (= |ULTIMATE.start_cstrspn_~s1#1.offset| 0) (= (+ |ULTIMATE.start_cstrspn_#t~post4#1.offset| 1) |ULTIMATE.start_cstrspn_~spanp~0#1.offset|) (<= 2 |ULTIMATE.start_cstrspn_#t~post4#1.base|))' at error location [2023-12-02 08:35:53,713 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 08:35:53,713 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 08:35:53,713 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 23, 23] total 39 [2023-12-02 08:35:53,713 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [226764986] [2023-12-02 08:35:53,713 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 08:35:53,714 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 39 states [2023-12-02 08:35:53,714 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 08:35:53,714 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2023-12-02 08:35:53,715 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=165, Invalid=2382, Unknown=3, NotChecked=0, Total=2550 [2023-12-02 08:35:53,715 INFO L87 Difference]: Start difference. First operand 1169 states and 1384 transitions. Second operand has 39 states, 39 states have (on average 2.076923076923077) internal successors, (81), 39 states have internal predecessors, (81), 0 states have call successors, (0), 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 08:35:54,835 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 08:35:54,835 INFO L93 Difference]: Finished difference Result 1751 states and 2038 transitions. [2023-12-02 08:35:54,835 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2023-12-02 08:35:54,835 INFO L78 Accepts]: Start accepts. Automaton has has 39 states, 39 states have (on average 2.076923076923077) internal successors, (81), 39 states have internal predecessors, (81), 0 states have call successors, (0), 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 55 [2023-12-02 08:35:54,835 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 08:35:54,841 INFO L225 Difference]: With dead ends: 1751 [2023-12-02 08:35:54,841 INFO L226 Difference]: Without dead ends: 1453 [2023-12-02 08:35:54,841 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 207 GetRequests, 138 SyntacticMatches, 0 SemanticMatches, 69 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 965 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=373, Invalid=4594, Unknown=3, NotChecked=0, Total=4970 [2023-12-02 08:35:54,842 INFO L413 NwaCegarLoop]: 45 mSDtfsCounter, 228 mSDsluCounter, 1062 mSDsCounter, 0 mSdLazyCounter, 1461 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 228 SdHoareTripleChecker+Valid, 1107 SdHoareTripleChecker+Invalid, 1468 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 1461 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2023-12-02 08:35:54,842 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [228 Valid, 1107 Invalid, 1468 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 1461 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2023-12-02 08:35:54,843 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1453 states. [2023-12-02 08:35:54,856 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1453 to 1367. [2023-12-02 08:35:54,857 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1367 states, 1365 states have (on average 1.1868131868131868) internal successors, (1620), 1366 states have internal predecessors, (1620), 0 states have call successors, (0), 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 08:35:54,859 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1367 states to 1367 states and 1620 transitions. [2023-12-02 08:35:54,859 INFO L78 Accepts]: Start accepts. Automaton has 1367 states and 1620 transitions. Word has length 55 [2023-12-02 08:35:54,859 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 08:35:54,859 INFO L495 AbstractCegarLoop]: Abstraction has 1367 states and 1620 transitions. [2023-12-02 08:35:54,859 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 39 states, 39 states have (on average 2.076923076923077) internal successors, (81), 39 states have internal predecessors, (81), 0 states have call successors, (0), 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 08:35:54,859 INFO L276 IsEmpty]: Start isEmpty. Operand 1367 states and 1620 transitions. [2023-12-02 08:35:54,862 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2023-12-02 08:35:54,862 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 08:35:54,862 INFO L195 NwaCegarLoop]: trace histogram [7, 6, 6, 6, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 08:35:54,867 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Ended with exit code 0 [2023-12-02 08:35:55,062 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable39 [2023-12-02 08:35:55,063 INFO L420 AbstractCegarLoop]: === Iteration 41 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 10 more)] === [2023-12-02 08:35:55,064 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 08:35:55,064 INFO L85 PathProgramCache]: Analyzing trace with hash -986790813, now seen corresponding path program 11 times [2023-12-02 08:35:55,065 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 08:35:55,065 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [757175736] [2023-12-02 08:35:55,065 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 08:35:55,065 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 08:35:55,112 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 08:35:55,541 INFO L134 CoverageAnalysis]: Checked inductivity of 139 backedges. 16 proven. 122 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 08:35:55,541 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 08:35:55,541 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [757175736] [2023-12-02 08:35:55,541 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [757175736] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 08:35:55,541 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1600837600] [2023-12-02 08:35:55,541 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-12-02 08:35:55,541 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 08:35:55,542 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 08:35:55,542 INFO L229 MonitoredProcess]: Starting monitored process 29 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 08:35:55,543 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Waiting until timeout for monitored process [2023-12-02 08:35:55,739 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 7 check-sat command(s) [2023-12-02 08:35:55,739 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 08:35:55,743 INFO L262 TraceCheckSpWp]: Trace formula consists of 406 conjuncts, 62 conjunts are in the unsatisfiable core [2023-12-02 08:35:55,745 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 08:35:56,122 INFO L134 CoverageAnalysis]: Checked inductivity of 139 backedges. 25 proven. 113 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 08:35:56,122 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 08:35:56,526 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 7 treesize of output 5 [2023-12-02 08:35:56,639 INFO L134 CoverageAnalysis]: Checked inductivity of 139 backedges. 25 proven. 113 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 08:35:56,639 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1600837600] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 08:35:56,639 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1768205599] [2023-12-02 08:35:56,640 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2023-12-02 08:35:56,640 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 08:35:56,640 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 08:35:56,641 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 08:35:56,641 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 08:35:57,546 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 08:35:58,382 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '39730#(or (< (select |#length| |ULTIMATE.start_cstrspn_#t~post2#1.base|) (+ |ULTIMATE.start_cstrspn_#t~post2#1.offset| 1)) (< |ULTIMATE.start_cstrspn_#t~post2#1.offset| 0))' at error location [2023-12-02 08:35:58,382 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 08:35:58,382 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 08:35:58,382 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17] total 44 [2023-12-02 08:35:58,382 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [32038059] [2023-12-02 08:35:58,383 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 08:35:58,383 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 46 states [2023-12-02 08:35:58,383 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 08:35:58,383 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2023-12-02 08:35:58,384 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=301, Invalid=2891, Unknown=0, NotChecked=0, Total=3192 [2023-12-02 08:35:58,384 INFO L87 Difference]: Start difference. First operand 1367 states and 1620 transitions. Second operand has 46 states, 45 states have (on average 3.422222222222222) internal successors, (154), 45 states have internal predecessors, (154), 0 states have call successors, (0), 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 08:35:59,216 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 08:35:59,216 INFO L93 Difference]: Finished difference Result 1536 states and 1812 transitions. [2023-12-02 08:35:59,217 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2023-12-02 08:35:59,217 INFO L78 Accepts]: Start accepts. Automaton has has 46 states, 45 states have (on average 3.422222222222222) internal successors, (154), 45 states have internal predecessors, (154), 0 states have call successors, (0), 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 57 [2023-12-02 08:35:59,217 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 08:35:59,222 INFO L225 Difference]: With dead ends: 1536 [2023-12-02 08:35:59,222 INFO L226 Difference]: Without dead ends: 1536 [2023-12-02 08:35:59,223 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 202 GetRequests, 124 SyntacticMatches, 7 SemanticMatches, 71 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1641 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=585, Invalid=4671, Unknown=0, NotChecked=0, Total=5256 [2023-12-02 08:35:59,223 INFO L413 NwaCegarLoop]: 27 mSDtfsCounter, 225 mSDsluCounter, 394 mSDsCounter, 0 mSdLazyCounter, 845 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 225 SdHoareTripleChecker+Valid, 421 SdHoareTripleChecker+Invalid, 845 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 845 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-12-02 08:35:59,224 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [225 Valid, 421 Invalid, 845 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 845 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-12-02 08:35:59,225 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1536 states. [2023-12-02 08:35:59,241 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1536 to 1529. [2023-12-02 08:35:59,242 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1529 states, 1527 states have (on average 1.18664047151277) internal successors, (1812), 1528 states have internal predecessors, (1812), 0 states have call successors, (0), 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 08:35:59,244 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1529 states to 1529 states and 1812 transitions. [2023-12-02 08:35:59,244 INFO L78 Accepts]: Start accepts. Automaton has 1529 states and 1812 transitions. Word has length 57 [2023-12-02 08:35:59,244 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 08:35:59,244 INFO L495 AbstractCegarLoop]: Abstraction has 1529 states and 1812 transitions. [2023-12-02 08:35:59,244 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 46 states, 45 states have (on average 3.422222222222222) internal successors, (154), 45 states have internal predecessors, (154), 0 states have call successors, (0), 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 08:35:59,244 INFO L276 IsEmpty]: Start isEmpty. Operand 1529 states and 1812 transitions. [2023-12-02 08:35:59,245 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2023-12-02 08:35:59,245 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 08:35:59,245 INFO L195 NwaCegarLoop]: trace histogram [9, 8, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 08:35:59,251 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Ended with exit code 0 [2023-12-02 08:35:59,446 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 29 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable40 [2023-12-02 08:35:59,446 INFO L420 AbstractCegarLoop]: === Iteration 42 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 10 more)] === [2023-12-02 08:35:59,446 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 08:35:59,446 INFO L85 PathProgramCache]: Analyzing trace with hash -479084142, now seen corresponding path program 15 times [2023-12-02 08:35:59,446 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 08:35:59,446 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [486617823] [2023-12-02 08:35:59,446 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 08:35:59,447 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 08:35:59,463 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 08:36:00,141 INFO L134 CoverageAnalysis]: Checked inductivity of 192 backedges. 36 proven. 156 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 08:36:00,141 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 08:36:00,141 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [486617823] [2023-12-02 08:36:00,141 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [486617823] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 08:36:00,141 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1416038801] [2023-12-02 08:36:00,141 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-12-02 08:36:00,141 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 08:36:00,142 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 08:36:00,142 INFO L229 MonitoredProcess]: Starting monitored process 30 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 08:36:00,143 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Waiting until timeout for monitored process [2023-12-02 08:36:00,304 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-12-02 08:36:00,304 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 08:36:00,307 INFO L262 TraceCheckSpWp]: Trace formula consists of 359 conjuncts, 96 conjunts are in the unsatisfiable core [2023-12-02 08:36:00,309 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 08:36:00,314 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 1 [2023-12-02 08:36:00,680 INFO L134 CoverageAnalysis]: Checked inductivity of 192 backedges. 49 proven. 143 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 08:36:00,680 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 08:36:01,569 INFO L134 CoverageAnalysis]: Checked inductivity of 192 backedges. 49 proven. 143 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 08:36:01,569 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1416038801] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 08:36:01,569 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [676549250] [2023-12-02 08:36:01,570 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2023-12-02 08:36:01,571 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 08:36:01,571 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 08:36:01,571 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 08:36:01,571 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 08:36:02,187 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 08:36:03,949 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '43231#(and (<= 2 |ULTIMATE.start_cstrspn_~s2#1.base|) (= |ULTIMATE.start_cstrspn_#in~s2#1.offset| 0) (<= 2 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |ULTIMATE.start_main_#t~malloc8#1.offset| 0) (<= 0 |ULTIMATE.start_cstrspn_#t~post4#1.offset|) (<= 1 |#StackHeapBarrier|) (= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (= |ULTIMATE.start_main_~length1~0#1| 1) (= |ULTIMATE.start_cstrspn_~p~0#1.offset| 1) (= |ULTIMATE.start_cstrspn_~spanp~0#1.base| |ULTIMATE.start_cstrspn_#t~post4#1.base|) (<= 2 |ULTIMATE.start_main_#t~malloc9#1.base|) (<= 2 |ULTIMATE.start_cstrspn_#in~s1#1.base|) (= |ULTIMATE.start_cstrspn_#in~s1#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc9#1.offset| 0) (= 0 |ULTIMATE.start_cstrspn_~s2#1.offset|) (= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 2 |ULTIMATE.start_cstrspn_~p~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 2 |ULTIMATE.start_main_#t~malloc8#1.base|) (<= 2 |ULTIMATE.start_cstrspn_#in~s2#1.base|) (<= (select |#length| |ULTIMATE.start_cstrspn_#t~post4#1.base|) |ULTIMATE.start_cstrspn_#t~post4#1.offset|) (<= 2 |ULTIMATE.start_cstrspn_~s1#1.base|) (<= 2 |ULTIMATE.start_main_~nondetString1~0#1.base|) (= |ULTIMATE.start_cstrspn_~s1#1.offset| 0) (= (+ |ULTIMATE.start_cstrspn_#t~post4#1.offset| 1) |ULTIMATE.start_cstrspn_~spanp~0#1.offset|) (<= 2 |ULTIMATE.start_cstrspn_#t~post4#1.base|))' at error location [2023-12-02 08:36:03,949 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 08:36:03,949 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 08:36:03,950 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 21, 21] total 55 [2023-12-02 08:36:03,950 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [727739035] [2023-12-02 08:36:03,950 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 08:36:03,950 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 57 states [2023-12-02 08:36:03,950 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 08:36:03,951 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 57 interpolants. [2023-12-02 08:36:03,951 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=486, Invalid=4204, Unknown=2, NotChecked=0, Total=4692 [2023-12-02 08:36:03,951 INFO L87 Difference]: Start difference. First operand 1529 states and 1812 transitions. Second operand has 57 states, 56 states have (on average 2.482142857142857) internal successors, (139), 56 states have internal predecessors, (139), 0 states have call successors, (0), 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 08:36:05,673 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 08:36:05,673 INFO L93 Difference]: Finished difference Result 1795 states and 2089 transitions. [2023-12-02 08:36:05,674 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2023-12-02 08:36:05,674 INFO L78 Accepts]: Start accepts. Automaton has has 57 states, 56 states have (on average 2.482142857142857) internal successors, (139), 56 states have internal predecessors, (139), 0 states have call successors, (0), 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 57 [2023-12-02 08:36:05,674 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 08:36:05,679 INFO L225 Difference]: With dead ends: 1795 [2023-12-02 08:36:05,679 INFO L226 Difference]: Without dead ends: 1795 [2023-12-02 08:36:05,680 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 213 GetRequests, 124 SyntacticMatches, 0 SemanticMatches, 89 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2529 ImplicationChecksByTransitivity, 3.9s TimeCoverageRelationStatistics Valid=1060, Invalid=7128, Unknown=2, NotChecked=0, Total=8190 [2023-12-02 08:36:05,680 INFO L413 NwaCegarLoop]: 40 mSDtfsCounter, 365 mSDsluCounter, 723 mSDsCounter, 0 mSdLazyCounter, 1374 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 365 SdHoareTripleChecker+Valid, 763 SdHoareTripleChecker+Invalid, 1376 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 1374 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2023-12-02 08:36:05,680 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [365 Valid, 763 Invalid, 1376 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 1374 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2023-12-02 08:36:05,682 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1795 states. [2023-12-02 08:36:05,699 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1795 to 1581. [2023-12-02 08:36:05,700 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1581 states, 1579 states have (on average 1.1880937302089931) internal successors, (1876), 1580 states have internal predecessors, (1876), 0 states have call successors, (0), 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 08:36:05,703 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1581 states to 1581 states and 1876 transitions. [2023-12-02 08:36:05,703 INFO L78 Accepts]: Start accepts. Automaton has 1581 states and 1876 transitions. Word has length 57 [2023-12-02 08:36:05,703 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 08:36:05,703 INFO L495 AbstractCegarLoop]: Abstraction has 1581 states and 1876 transitions. [2023-12-02 08:36:05,703 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 57 states, 56 states have (on average 2.482142857142857) internal successors, (139), 56 states have internal predecessors, (139), 0 states have call successors, (0), 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 08:36:05,703 INFO L276 IsEmpty]: Start isEmpty. Operand 1581 states and 1876 transitions. [2023-12-02 08:36:05,704 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2023-12-02 08:36:05,705 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 08:36:05,705 INFO L195 NwaCegarLoop]: trace histogram [10, 9, 9, 9, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 08:36:05,711 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Ended with exit code 0 [2023-12-02 08:36:05,905 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable41,30 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 08:36:05,905 INFO L420 AbstractCegarLoop]: === Iteration 43 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 10 more)] === [2023-12-02 08:36:05,906 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 08:36:05,906 INFO L85 PathProgramCache]: Analyzing trace with hash 1818326934, now seen corresponding path program 16 times [2023-12-02 08:36:05,906 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 08:36:05,906 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [676506371] [2023-12-02 08:36:05,906 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 08:36:05,906 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 08:36:05,926 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 08:36:06,605 INFO L134 CoverageAnalysis]: Checked inductivity of 226 backedges. 26 proven. 200 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 08:36:06,605 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 08:36:06,605 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [676506371] [2023-12-02 08:36:06,605 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [676506371] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 08:36:06,605 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [83477209] [2023-12-02 08:36:06,605 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-12-02 08:36:06,606 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 08:36:06,606 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 08:36:06,606 INFO L229 MonitoredProcess]: Starting monitored process 31 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 08:36:06,607 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Waiting until timeout for monitored process [2023-12-02 08:36:06,734 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 08:36:06,738 INFO L262 TraceCheckSpWp]: Trace formula consists of 377 conjuncts, 107 conjunts are in the unsatisfiable core [2023-12-02 08:36:06,742 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 08:36:06,921 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2023-12-02 08:36:07,980 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-12-02 08:36:07,980 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 20 treesize of output 17 [2023-12-02 08:36:08,160 INFO L134 CoverageAnalysis]: Checked inductivity of 226 backedges. 49 proven. 177 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 08:36:08,161 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 08:36:09,286 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 13 [2023-12-02 08:36:09,289 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2023-12-02 08:36:09,293 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 20 [2023-12-02 08:36:09,462 INFO L134 CoverageAnalysis]: Checked inductivity of 226 backedges. 49 proven. 177 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 08:36:09,463 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [83477209] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 08:36:09,463 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [332995526] [2023-12-02 08:36:09,464 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2023-12-02 08:36:09,464 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 08:36:09,464 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 08:36:09,464 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 08:36:09,464 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 08:36:10,063 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 08:36:12,500 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '47089#(and (<= 2 |ULTIMATE.start_cstrspn_~s2#1.base|) (= |ULTIMATE.start_cstrspn_#in~s2#1.offset| 0) (<= 2 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |ULTIMATE.start_main_#t~malloc8#1.offset| 0) (<= 0 |ULTIMATE.start_cstrspn_#t~post4#1.offset|) (<= 1 |#StackHeapBarrier|) (= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (= |ULTIMATE.start_main_~length1~0#1| 1) (= |ULTIMATE.start_cstrspn_~p~0#1.offset| 1) (= |ULTIMATE.start_cstrspn_~spanp~0#1.base| |ULTIMATE.start_cstrspn_#t~post4#1.base|) (<= 2 |ULTIMATE.start_main_#t~malloc9#1.base|) (<= 2 |ULTIMATE.start_cstrspn_#in~s1#1.base|) (= |ULTIMATE.start_cstrspn_#in~s1#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc9#1.offset| 0) (= 0 |ULTIMATE.start_cstrspn_~s2#1.offset|) (= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 2 |ULTIMATE.start_cstrspn_~p~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 2 |ULTIMATE.start_main_#t~malloc8#1.base|) (<= 2 |ULTIMATE.start_cstrspn_#in~s2#1.base|) (<= (select |#length| |ULTIMATE.start_cstrspn_#t~post4#1.base|) |ULTIMATE.start_cstrspn_#t~post4#1.offset|) (<= 2 |ULTIMATE.start_cstrspn_~s1#1.base|) (<= 2 |ULTIMATE.start_main_~nondetString1~0#1.base|) (= |ULTIMATE.start_cstrspn_~s1#1.offset| 0) (= (+ |ULTIMATE.start_cstrspn_#t~post4#1.offset| 1) |ULTIMATE.start_cstrspn_~spanp~0#1.offset|) (<= 2 |ULTIMATE.start_cstrspn_#t~post4#1.base|))' at error location [2023-12-02 08:36:12,500 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 08:36:12,500 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 08:36:12,501 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 25, 25] total 66 [2023-12-02 08:36:12,501 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [408871637] [2023-12-02 08:36:12,501 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 08:36:12,501 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 66 states [2023-12-02 08:36:12,501 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 08:36:12,502 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 66 interpolants. [2023-12-02 08:36:12,502 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=355, Invalid=5649, Unknown=2, NotChecked=0, Total=6006 [2023-12-02 08:36:12,503 INFO L87 Difference]: Start difference. First operand 1581 states and 1876 transitions. Second operand has 66 states, 66 states have (on average 2.4696969696969697) internal successors, (163), 66 states have internal predecessors, (163), 0 states have call successors, (0), 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 08:36:48,278 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 08:36:48,278 INFO L93 Difference]: Finished difference Result 2576 states and 2972 transitions. [2023-12-02 08:36:48,279 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 61 states. [2023-12-02 08:36:48,279 INFO L78 Accepts]: Start accepts. Automaton has has 66 states, 66 states have (on average 2.4696969696969697) internal successors, (163), 66 states have internal predecessors, (163), 0 states have call successors, (0), 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 61 [2023-12-02 08:36:48,279 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 08:36:48,287 INFO L225 Difference]: With dead ends: 2576 [2023-12-02 08:36:48,287 INFO L226 Difference]: Without dead ends: 2241 [2023-12-02 08:36:48,288 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 256 GetRequests, 122 SyntacticMatches, 9 SemanticMatches, 125 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3938 ImplicationChecksByTransitivity, 38.5s TimeCoverageRelationStatistics Valid=1260, Invalid=14729, Unknown=13, NotChecked=0, Total=16002 [2023-12-02 08:36:48,288 INFO L413 NwaCegarLoop]: 46 mSDtfsCounter, 519 mSDsluCounter, 1305 mSDsCounter, 0 mSdLazyCounter, 2881 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 519 SdHoareTripleChecker+Valid, 1351 SdHoareTripleChecker+Invalid, 2893 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 2881 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.8s IncrementalHoareTripleChecker+Time [2023-12-02 08:36:48,288 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [519 Valid, 1351 Invalid, 2893 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 2881 Invalid, 0 Unknown, 0 Unchecked, 1.8s Time] [2023-12-02 08:36:48,290 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2241 states. [2023-12-02 08:36:48,311 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2241 to 1889. [2023-12-02 08:36:48,312 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1889 states, 1887 states have (on average 1.190779014308426) internal successors, (2247), 1888 states have internal predecessors, (2247), 0 states have call successors, (0), 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 08:36:48,316 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1889 states to 1889 states and 2247 transitions. [2023-12-02 08:36:48,316 INFO L78 Accepts]: Start accepts. Automaton has 1889 states and 2247 transitions. Word has length 61 [2023-12-02 08:36:48,317 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 08:36:48,317 INFO L495 AbstractCegarLoop]: Abstraction has 1889 states and 2247 transitions. [2023-12-02 08:36:48,317 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 66 states, 66 states have (on average 2.4696969696969697) internal successors, (163), 66 states have internal predecessors, (163), 0 states have call successors, (0), 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 08:36:48,317 INFO L276 IsEmpty]: Start isEmpty. Operand 1889 states and 2247 transitions. [2023-12-02 08:36:48,319 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2023-12-02 08:36:48,319 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 08:36:48,319 INFO L195 NwaCegarLoop]: trace histogram [8, 7, 7, 7, 7, 7, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 08:36:48,324 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Ended with exit code 0 [2023-12-02 08:36:48,519 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable42,31 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 08:36:48,519 INFO L420 AbstractCegarLoop]: === Iteration 44 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 10 more)] === [2023-12-02 08:36:48,520 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 08:36:48,520 INFO L85 PathProgramCache]: Analyzing trace with hash -1335679223, now seen corresponding path program 12 times [2023-12-02 08:36:48,520 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 08:36:48,520 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1566535786] [2023-12-02 08:36:48,520 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 08:36:48,520 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 08:36:48,543 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 08:36:49,401 INFO L134 CoverageAnalysis]: Checked inductivity of 177 backedges. 14 proven. 162 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 08:36:49,401 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 08:36:49,401 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1566535786] [2023-12-02 08:36:49,401 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1566535786] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 08:36:49,401 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [375417116] [2023-12-02 08:36:49,401 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-12-02 08:36:49,401 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 08:36:49,402 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 08:36:49,402 INFO L229 MonitoredProcess]: Starting monitored process 32 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 08:36:49,403 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (32)] Waiting until timeout for monitored process [2023-12-02 08:36:49,604 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-12-02 08:36:49,604 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 08:36:49,609 INFO L262 TraceCheckSpWp]: Trace formula consists of 443 conjuncts, 154 conjunts are in the unsatisfiable core [2023-12-02 08:36:49,611 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 08:36:50,081 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2023-12-02 08:36:50,148 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-12-02 08:36:50,148 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 29 treesize of output 13 [2023-12-02 08:36:52,037 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-12-02 08:36:52,039 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-12-02 08:36:52,042 INFO L349 Elim1Store]: treesize reduction 11, result has 8.3 percent of original size [2023-12-02 08:36:52,042 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 51 treesize of output 17 [2023-12-02 08:36:52,098 INFO L134 CoverageAnalysis]: Checked inductivity of 177 backedges. 14 proven. 163 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 08:36:52,098 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 08:36:53,431 INFO L349 Elim1Store]: treesize reduction 40, result has 57.9 percent of original size [2023-12-02 08:36:53,432 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 4 new quantified variables, introduced 7 case distinctions, treesize of input 527 treesize of output 422 [2023-12-02 08:36:53,450 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-12-02 08:36:53,450 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 338 treesize of output 318 [2023-12-02 08:36:53,611 INFO L349 Elim1Store]: treesize reduction 22, result has 12.0 percent of original size [2023-12-02 08:36:53,611 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 56 treesize of output 44 [2023-12-02 08:36:53,718 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-12-02 08:36:53,718 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 5 select indices, 5 select index equivalence classes, 0 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 10 case distinctions, treesize of input 233 treesize of output 258 [2023-12-02 08:36:57,897 INFO L134 CoverageAnalysis]: Checked inductivity of 177 backedges. 26 proven. 151 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 08:36:57,897 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [375417116] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 08:36:57,897 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1182182875] [2023-12-02 08:36:57,898 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2023-12-02 08:36:57,898 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 08:36:57,899 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 08:36:57,899 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 08:36:57,899 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 08:36:58,837 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 08:37:00,617 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '52122#(or (< (select |#length| |ULTIMATE.start_cstrspn_#t~post2#1.base|) (+ |ULTIMATE.start_cstrspn_#t~post2#1.offset| 1)) (< |ULTIMATE.start_cstrspn_#t~post2#1.offset| 0))' at error location [2023-12-02 08:37:00,618 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 08:37:00,618 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 08:37:00,618 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 33, 33] total 85 [2023-12-02 08:37:00,618 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1981168448] [2023-12-02 08:37:00,618 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 08:37:00,618 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 86 states [2023-12-02 08:37:00,619 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 08:37:00,619 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 86 interpolants. [2023-12-02 08:37:00,620 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=408, Invalid=8904, Unknown=0, NotChecked=0, Total=9312 [2023-12-02 08:37:00,620 INFO L87 Difference]: Start difference. First operand 1889 states and 2247 transitions. Second operand has 86 states, 86 states have (on average 2.0813953488372094) internal successors, (179), 85 states have internal predecessors, (179), 0 states have call successors, (0), 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 08:37:16,667 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 08:37:16,667 INFO L93 Difference]: Finished difference Result 3834 states and 4558 transitions. [2023-12-02 08:37:16,668 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 93 states. [2023-12-02 08:37:16,668 INFO L78 Accepts]: Start accepts. Automaton has has 86 states, 86 states have (on average 2.0813953488372094) internal successors, (179), 85 states have internal predecessors, (179), 0 states have call successors, (0), 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 63 [2023-12-02 08:37:16,668 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 08:37:16,680 INFO L225 Difference]: With dead ends: 3834 [2023-12-02 08:37:16,680 INFO L226 Difference]: Without dead ends: 3790 [2023-12-02 08:37:16,681 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 301 GetRequests, 118 SyntacticMatches, 0 SemanticMatches, 183 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7542 ImplicationChecksByTransitivity, 20.3s TimeCoverageRelationStatistics Valid=2196, Invalid=31844, Unknown=0, NotChecked=0, Total=34040 [2023-12-02 08:37:16,682 INFO L413 NwaCegarLoop]: 37 mSDtfsCounter, 501 mSDsluCounter, 1382 mSDsCounter, 0 mSdLazyCounter, 3275 mSolverCounterSat, 21 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 501 SdHoareTripleChecker+Valid, 1419 SdHoareTripleChecker+Invalid, 3296 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 21 IncrementalHoareTripleChecker+Valid, 3275 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.4s IncrementalHoareTripleChecker+Time [2023-12-02 08:37:16,682 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [501 Valid, 1419 Invalid, 3296 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [21 Valid, 3275 Invalid, 0 Unknown, 0 Unchecked, 2.4s Time] [2023-12-02 08:37:16,684 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3790 states. [2023-12-02 08:37:16,709 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3790 to 3162. [2023-12-02 08:37:16,711 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3162 states, 3160 states have (on average 1.1908227848101265) internal successors, (3763), 3161 states have internal predecessors, (3763), 0 states have call successors, (0), 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 08:37:16,716 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3162 states to 3162 states and 3763 transitions. [2023-12-02 08:37:16,716 INFO L78 Accepts]: Start accepts. Automaton has 3162 states and 3763 transitions. Word has length 63 [2023-12-02 08:37:16,716 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 08:37:16,716 INFO L495 AbstractCegarLoop]: Abstraction has 3162 states and 3763 transitions. [2023-12-02 08:37:16,716 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 86 states, 86 states have (on average 2.0813953488372094) internal successors, (179), 85 states have internal predecessors, (179), 0 states have call successors, (0), 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 08:37:16,717 INFO L276 IsEmpty]: Start isEmpty. Operand 3162 states and 3763 transitions. [2023-12-02 08:37:16,719 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2023-12-02 08:37:16,719 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 08:37:16,719 INFO L195 NwaCegarLoop]: trace histogram [8, 7, 7, 7, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 08:37:16,725 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (32)] Ended with exit code 0 [2023-12-02 08:37:16,919 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable43,32 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 08:37:16,919 INFO L420 AbstractCegarLoop]: === Iteration 45 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 10 more)] === [2023-12-02 08:37:16,920 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 08:37:16,920 INFO L85 PathProgramCache]: Analyzing trace with hash -2088577545, now seen corresponding path program 13 times [2023-12-02 08:37:16,920 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 08:37:16,920 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [511589998] [2023-12-02 08:37:16,920 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 08:37:16,920 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 08:37:16,940 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 08:37:17,403 INFO L134 CoverageAnalysis]: Checked inductivity of 190 backedges. 25 proven. 164 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 08:37:17,404 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 08:37:17,404 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [511589998] [2023-12-02 08:37:17,404 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [511589998] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 08:37:17,404 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1390940793] [2023-12-02 08:37:17,404 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-12-02 08:37:17,404 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 08:37:17,404 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 08:37:17,405 INFO L229 MonitoredProcess]: Starting monitored process 33 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 08:37:17,406 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Waiting until timeout for monitored process [2023-12-02 08:37:17,537 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 08:37:17,540 INFO L262 TraceCheckSpWp]: Trace formula consists of 456 conjuncts, 81 conjunts are in the unsatisfiable core [2023-12-02 08:37:17,542 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 08:37:17,740 INFO L134 CoverageAnalysis]: Checked inductivity of 190 backedges. 36 proven. 153 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 08:37:17,740 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 08:37:18,171 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 5 treesize of output 3 [2023-12-02 08:37:18,226 INFO L134 CoverageAnalysis]: Checked inductivity of 190 backedges. 36 proven. 153 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 08:37:18,227 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1390940793] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 08:37:18,227 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1132948795] [2023-12-02 08:37:18,228 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2023-12-02 08:37:18,228 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 08:37:18,228 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 08:37:18,228 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 08:37:18,228 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 08:37:19,169 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 08:37:20,008 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '59723#(or (< (select |#length| |ULTIMATE.start_cstrspn_#t~post2#1.base|) (+ |ULTIMATE.start_cstrspn_#t~post2#1.offset| 1)) (< |ULTIMATE.start_cstrspn_#t~post2#1.offset| 0))' at error location [2023-12-02 08:37:20,008 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 08:37:20,008 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 08:37:20,009 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 19] total 32 [2023-12-02 08:37:20,009 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1009372722] [2023-12-02 08:37:20,009 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 08:37:20,009 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 34 states [2023-12-02 08:37:20,009 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 08:37:20,009 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2023-12-02 08:37:20,010 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=149, Invalid=1831, Unknown=0, NotChecked=0, Total=1980 [2023-12-02 08:37:20,010 INFO L87 Difference]: Start difference. First operand 3162 states and 3763 transitions. Second operand has 34 states, 33 states have (on average 3.515151515151515) internal successors, (116), 33 states have internal predecessors, (116), 0 states have call successors, (0), 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 08:37:21,184 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 08:37:21,184 INFO L93 Difference]: Finished difference Result 3573 states and 4251 transitions. [2023-12-02 08:37:21,185 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2023-12-02 08:37:21,185 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 33 states have (on average 3.515151515151515) internal successors, (116), 33 states have internal predecessors, (116), 0 states have call successors, (0), 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 65 [2023-12-02 08:37:21,185 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 08:37:21,197 INFO L225 Difference]: With dead ends: 3573 [2023-12-02 08:37:21,197 INFO L226 Difference]: Without dead ends: 3573 [2023-12-02 08:37:21,197 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 230 GetRequests, 161 SyntacticMatches, 8 SemanticMatches, 61 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 753 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=342, Invalid=3564, Unknown=0, NotChecked=0, Total=3906 [2023-12-02 08:37:21,197 INFO L413 NwaCegarLoop]: 33 mSDtfsCounter, 174 mSDsluCounter, 586 mSDsCounter, 0 mSdLazyCounter, 1288 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 174 SdHoareTripleChecker+Valid, 619 SdHoareTripleChecker+Invalid, 1288 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 1288 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2023-12-02 08:37:21,198 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [174 Valid, 619 Invalid, 1288 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 1288 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2023-12-02 08:37:21,200 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3573 states. [2023-12-02 08:37:21,225 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3573 to 3366. [2023-12-02 08:37:21,227 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3366 states, 3364 states have (on average 1.190844233055886) internal successors, (4006), 3365 states have internal predecessors, (4006), 0 states have call successors, (0), 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 08:37:21,232 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3366 states to 3366 states and 4006 transitions. [2023-12-02 08:37:21,232 INFO L78 Accepts]: Start accepts. Automaton has 3366 states and 4006 transitions. Word has length 65 [2023-12-02 08:37:21,232 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 08:37:21,232 INFO L495 AbstractCegarLoop]: Abstraction has 3366 states and 4006 transitions. [2023-12-02 08:37:21,232 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 34 states, 33 states have (on average 3.515151515151515) internal successors, (116), 33 states have internal predecessors, (116), 0 states have call successors, (0), 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 08:37:21,232 INFO L276 IsEmpty]: Start isEmpty. Operand 3366 states and 4006 transitions. [2023-12-02 08:37:21,235 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2023-12-02 08:37:21,235 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 08:37:21,235 INFO L195 NwaCegarLoop]: trace histogram [11, 10, 10, 10, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 08:37:21,240 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Ended with exit code 0 [2023-12-02 08:37:21,435 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable44,33 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 08:37:21,436 INFO L420 AbstractCegarLoop]: === Iteration 46 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 10 more)] === [2023-12-02 08:37:21,436 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 08:37:21,436 INFO L85 PathProgramCache]: Analyzing trace with hash -1631607329, now seen corresponding path program 17 times [2023-12-02 08:37:21,436 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 08:37:21,436 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1133014264] [2023-12-02 08:37:21,436 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 08:37:21,436 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 08:37:21,460 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 08:37:22,207 INFO L134 CoverageAnalysis]: Checked inductivity of 281 backedges. 29 proven. 252 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 08:37:22,207 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 08:37:22,207 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1133014264] [2023-12-02 08:37:22,207 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1133014264] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 08:37:22,207 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1666871455] [2023-12-02 08:37:22,207 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-12-02 08:37:22,207 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 08:37:22,207 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 08:37:22,208 INFO L229 MonitoredProcess]: Starting monitored process 34 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 08:37:22,209 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (34)] Waiting until timeout for monitored process [2023-12-02 08:37:22,435 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 11 check-sat command(s) [2023-12-02 08:37:22,435 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 08:37:22,439 INFO L262 TraceCheckSpWp]: Trace formula consists of 408 conjuncts, 120 conjunts are in the unsatisfiable core [2023-12-02 08:37:22,441 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 08:37:22,707 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2023-12-02 08:37:22,836 INFO L134 CoverageAnalysis]: Checked inductivity of 281 backedges. 29 proven. 252 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 08:37:22,836 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 08:37:22,889 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 13 [2023-12-02 08:37:22,890 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2023-12-02 08:37:22,975 INFO L134 CoverageAnalysis]: Checked inductivity of 281 backedges. 29 proven. 252 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 08:37:22,976 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1666871455] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 08:37:22,976 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [943807869] [2023-12-02 08:37:22,977 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2023-12-02 08:37:22,977 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 08:37:22,977 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 08:37:22,977 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 08:37:22,977 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 08:37:23,683 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 08:37:25,686 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '67150#(and (<= 2 |ULTIMATE.start_cstrspn_~s2#1.base|) (= |ULTIMATE.start_cstrspn_#in~s2#1.offset| 0) (<= 2 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |ULTIMATE.start_main_#t~malloc8#1.offset| 0) (<= 0 |ULTIMATE.start_cstrspn_#t~post4#1.offset|) (<= 1 |#StackHeapBarrier|) (= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (= |ULTIMATE.start_main_~length1~0#1| 1) (= |ULTIMATE.start_cstrspn_~p~0#1.offset| 1) (= |ULTIMATE.start_cstrspn_~spanp~0#1.base| |ULTIMATE.start_cstrspn_#t~post4#1.base|) (<= 2 |ULTIMATE.start_main_#t~malloc9#1.base|) (<= 2 |ULTIMATE.start_cstrspn_#in~s1#1.base|) (= |ULTIMATE.start_cstrspn_#in~s1#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc9#1.offset| 0) (= 0 |ULTIMATE.start_cstrspn_~s2#1.offset|) (= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 2 |ULTIMATE.start_cstrspn_~p~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 2 |ULTIMATE.start_main_#t~malloc8#1.base|) (<= 2 |ULTIMATE.start_cstrspn_#in~s2#1.base|) (<= (select |#length| |ULTIMATE.start_cstrspn_#t~post4#1.base|) |ULTIMATE.start_cstrspn_#t~post4#1.offset|) (<= 2 |ULTIMATE.start_cstrspn_~s1#1.base|) (<= 2 |ULTIMATE.start_main_~nondetString1~0#1.base|) (= |ULTIMATE.start_cstrspn_~s1#1.offset| 0) (= (+ |ULTIMATE.start_cstrspn_#t~post4#1.offset| 1) |ULTIMATE.start_cstrspn_~spanp~0#1.offset|) (<= 2 |ULTIMATE.start_cstrspn_#t~post4#1.base|))' at error location [2023-12-02 08:37:25,686 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 08:37:25,686 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 08:37:25,686 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 27, 27] total 45 [2023-12-02 08:37:25,686 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1816997703] [2023-12-02 08:37:25,686 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 08:37:25,686 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 45 states [2023-12-02 08:37:25,686 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 08:37:25,687 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2023-12-02 08:37:25,687 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=181, Invalid=3008, Unknown=3, NotChecked=0, Total=3192 [2023-12-02 08:37:25,696 INFO L87 Difference]: Start difference. First operand 3366 states and 4006 transitions. Second operand has 45 states, 45 states have (on average 2.1555555555555554) internal successors, (97), 45 states have internal predecessors, (97), 0 states have call successors, (0), 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 08:37:27,161 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 08:37:27,162 INFO L93 Difference]: Finished difference Result 4557 states and 5356 transitions. [2023-12-02 08:37:27,162 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2023-12-02 08:37:27,162 INFO L78 Accepts]: Start accepts. Automaton has has 45 states, 45 states have (on average 2.1555555555555554) internal successors, (97), 45 states have internal predecessors, (97), 0 states have call successors, (0), 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 67 [2023-12-02 08:37:27,162 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 08:37:27,169 INFO L225 Difference]: With dead ends: 4557 [2023-12-02 08:37:27,169 INFO L226 Difference]: Without dead ends: 4167 [2023-12-02 08:37:27,169 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 251 GetRequests, 172 SyntacticMatches, 0 SemanticMatches, 79 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1244 ImplicationChecksByTransitivity, 3.4s TimeCoverageRelationStatistics Valid=427, Invalid=6050, Unknown=3, NotChecked=0, Total=6480 [2023-12-02 08:37:27,169 INFO L413 NwaCegarLoop]: 56 mSDtfsCounter, 286 mSDsluCounter, 1308 mSDsCounter, 0 mSdLazyCounter, 1796 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 286 SdHoareTripleChecker+Valid, 1364 SdHoareTripleChecker+Invalid, 1805 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 1796 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2023-12-02 08:37:27,170 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [286 Valid, 1364 Invalid, 1805 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 1796 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2023-12-02 08:37:27,172 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4167 states. [2023-12-02 08:37:27,201 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4167 to 3926. [2023-12-02 08:37:27,204 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3926 states, 3924 states have (on average 1.1929153924566769) internal successors, (4681), 3925 states have internal predecessors, (4681), 0 states have call successors, (0), 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 08:37:27,208 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3926 states to 3926 states and 4681 transitions. [2023-12-02 08:37:27,208 INFO L78 Accepts]: Start accepts. Automaton has 3926 states and 4681 transitions. Word has length 67 [2023-12-02 08:37:27,209 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 08:37:27,209 INFO L495 AbstractCegarLoop]: Abstraction has 3926 states and 4681 transitions. [2023-12-02 08:37:27,209 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 45 states, 45 states have (on average 2.1555555555555554) internal successors, (97), 45 states have internal predecessors, (97), 0 states have call successors, (0), 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 08:37:27,209 INFO L276 IsEmpty]: Start isEmpty. Operand 3926 states and 4681 transitions. [2023-12-02 08:37:27,212 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2023-12-02 08:37:27,212 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 08:37:27,212 INFO L195 NwaCegarLoop]: trace histogram [8, 8, 8, 8, 7, 7, 6, 6, 2, 2, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 08:37:27,218 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (34)] Ended with exit code 0 [2023-12-02 08:37:27,412 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable45,34 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 08:37:27,412 INFO L420 AbstractCegarLoop]: === Iteration 47 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 10 more)] === [2023-12-02 08:37:27,413 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 08:37:27,413 INFO L85 PathProgramCache]: Analyzing trace with hash 847937554, now seen corresponding path program 2 times [2023-12-02 08:37:27,413 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 08:37:27,413 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [496542616] [2023-12-02 08:37:27,413 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 08:37:27,413 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 08:37:27,439 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 08:37:28,164 INFO L134 CoverageAnalysis]: Checked inductivity of 208 backedges. 14 proven. 187 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2023-12-02 08:37:28,164 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 08:37:28,164 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [496542616] [2023-12-02 08:37:28,164 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [496542616] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 08:37:28,164 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1361596021] [2023-12-02 08:37:28,164 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-12-02 08:37:28,165 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 08:37:28,165 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 08:37:28,165 INFO L229 MonitoredProcess]: Starting monitored process 35 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 08:37:28,166 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (35)] Waiting until timeout for monitored process [2023-12-02 08:37:28,525 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 8 check-sat command(s) [2023-12-02 08:37:28,525 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 08:37:28,530 INFO L262 TraceCheckSpWp]: Trace formula consists of 474 conjuncts, 95 conjunts are in the unsatisfiable core [2023-12-02 08:37:28,532 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 08:37:28,537 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2023-12-02 08:37:28,618 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 13 treesize of output 9 [2023-12-02 08:37:28,624 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 18 treesize of output 13 [2023-12-02 08:37:28,699 INFO L134 CoverageAnalysis]: Checked inductivity of 208 backedges. 15 proven. 186 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2023-12-02 08:37:28,699 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 08:37:28,765 WARN L854 $PredicateComparison]: unable to prove that (forall ((v_ArrVal_1297 (Array Int Int))) (= (select (select (store |c_#memory_int| |c_ULTIMATE.start_main_~nondetString2~0#1.base| v_ArrVal_1297) |c_ULTIMATE.start_main_~nondetString1~0#1.base|) (+ 6 |c_ULTIMATE.start_main_~nondetString1~0#1.offset|)) 0)) is different from false [2023-12-02 08:37:28,769 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-12-02 08:37:28,770 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 23 treesize of output 24 [2023-12-02 08:37:28,775 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-12-02 08:37:28,775 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 37 treesize of output 32 [2023-12-02 08:37:28,885 INFO L134 CoverageAnalysis]: Checked inductivity of 208 backedges. 14 proven. 187 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2023-12-02 08:37:28,885 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1361596021] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 08:37:28,885 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1721800212] [2023-12-02 08:37:28,886 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2023-12-02 08:37:28,887 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 08:37:28,887 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 08:37:28,887 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 08:37:28,887 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 08:37:30,301 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 08:37:30,956 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '76129#(or (< (select |#length| |ULTIMATE.start_cstrspn_#t~post2#1.base|) (+ |ULTIMATE.start_cstrspn_#t~post2#1.offset| 1)) (< |ULTIMATE.start_cstrspn_#t~post2#1.offset| 0))' at error location [2023-12-02 08:37:30,957 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 08:37:30,957 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 08:37:30,957 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 21, 21] total 27 [2023-12-02 08:37:30,957 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1435963241] [2023-12-02 08:37:30,957 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 08:37:30,957 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 28 states [2023-12-02 08:37:30,957 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 08:37:30,958 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2023-12-02 08:37:30,958 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=92, Invalid=1243, Unknown=1, NotChecked=70, Total=1406 [2023-12-02 08:37:30,958 INFO L87 Difference]: Start difference. First operand 3926 states and 4681 transitions. Second operand has 28 states, 28 states have (on average 2.7142857142857144) internal successors, (76), 27 states have internal predecessors, (76), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 08:37:32,143 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 08:37:32,143 INFO L93 Difference]: Finished difference Result 4116 states and 4857 transitions. [2023-12-02 08:37:32,144 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2023-12-02 08:37:32,144 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 28 states have (on average 2.7142857142857144) internal successors, (76), 27 states have internal predecessors, (76), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 69 [2023-12-02 08:37:32,144 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 08:37:32,148 INFO L225 Difference]: With dead ends: 4116 [2023-12-02 08:37:32,149 INFO L226 Difference]: Without dead ends: 2756 [2023-12-02 08:37:32,149 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 250 GetRequests, 191 SyntacticMatches, 0 SemanticMatches, 59 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 461 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=271, Invalid=3272, Unknown=1, NotChecked=116, Total=3660 [2023-12-02 08:37:32,149 INFO L413 NwaCegarLoop]: 49 mSDtfsCounter, 190 mSDsluCounter, 799 mSDsCounter, 0 mSdLazyCounter, 1167 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 190 SdHoareTripleChecker+Valid, 848 SdHoareTripleChecker+Invalid, 1282 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 1167 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 106 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2023-12-02 08:37:32,150 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [190 Valid, 848 Invalid, 1282 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 1167 Invalid, 0 Unknown, 106 Unchecked, 0.5s Time] [2023-12-02 08:37:32,152 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2756 states. [2023-12-02 08:37:32,173 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2756 to 2484. [2023-12-02 08:37:32,175 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2484 states, 2482 states have (on average 1.1925866236905722) internal successors, (2960), 2483 states have internal predecessors, (2960), 0 states have call successors, (0), 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 08:37:32,178 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2484 states to 2484 states and 2960 transitions. [2023-12-02 08:37:32,178 INFO L78 Accepts]: Start accepts. Automaton has 2484 states and 2960 transitions. Word has length 69 [2023-12-02 08:37:32,178 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 08:37:32,178 INFO L495 AbstractCegarLoop]: Abstraction has 2484 states and 2960 transitions. [2023-12-02 08:37:32,178 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 28 states, 28 states have (on average 2.7142857142857144) internal successors, (76), 27 states have internal predecessors, (76), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 08:37:32,178 INFO L276 IsEmpty]: Start isEmpty. Operand 2484 states and 2960 transitions. [2023-12-02 08:37:32,180 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2023-12-02 08:37:32,180 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 08:37:32,180 INFO L195 NwaCegarLoop]: trace histogram [11, 10, 10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 08:37:32,186 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (35)] Ended with exit code 0 [2023-12-02 08:37:32,380 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 35 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable46 [2023-12-02 08:37:32,381 INFO L420 AbstractCegarLoop]: === Iteration 48 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 10 more)] === [2023-12-02 08:37:32,381 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 08:37:32,381 INFO L85 PathProgramCache]: Analyzing trace with hash 1457734372, now seen corresponding path program 18 times [2023-12-02 08:37:32,381 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 08:37:32,381 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [751942220] [2023-12-02 08:37:32,381 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 08:37:32,381 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 08:37:32,399 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 08:37:33,480 INFO L134 CoverageAnalysis]: Checked inductivity of 300 backedges. 64 proven. 236 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 08:37:33,480 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 08:37:33,480 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [751942220] [2023-12-02 08:37:33,480 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [751942220] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 08:37:33,480 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [583849900] [2023-12-02 08:37:33,481 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-12-02 08:37:33,481 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 08:37:33,481 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 08:37:33,482 INFO L229 MonitoredProcess]: Starting monitored process 36 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 08:37:33,483 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (36)] Waiting until timeout for monitored process [2023-12-02 08:37:33,670 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-12-02 08:37:33,670 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 08:37:33,674 INFO L262 TraceCheckSpWp]: Trace formula consists of 421 conjuncts, 114 conjunts are in the unsatisfiable core [2023-12-02 08:37:33,677 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 08:37:33,682 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 1 [2023-12-02 08:37:34,192 INFO L134 CoverageAnalysis]: Checked inductivity of 300 backedges. 81 proven. 219 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 08:37:34,192 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 08:37:35,406 INFO L134 CoverageAnalysis]: Checked inductivity of 300 backedges. 81 proven. 219 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 08:37:35,407 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [583849900] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 08:37:35,407 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1373138603] [2023-12-02 08:37:35,408 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2023-12-02 08:37:35,408 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 08:37:35,408 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 08:37:35,408 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 08:37:35,408 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 08:37:36,012 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 08:37:38,049 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '83260#(and (<= 2 |ULTIMATE.start_cstrspn_~s2#1.base|) (= |ULTIMATE.start_cstrspn_#in~s2#1.offset| 0) (<= 2 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |ULTIMATE.start_main_#t~malloc8#1.offset| 0) (<= 0 |ULTIMATE.start_cstrspn_#t~post4#1.offset|) (<= 1 |#StackHeapBarrier|) (= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (= |ULTIMATE.start_main_~length1~0#1| 1) (= |ULTIMATE.start_cstrspn_~p~0#1.offset| 1) (= |ULTIMATE.start_cstrspn_~spanp~0#1.base| |ULTIMATE.start_cstrspn_#t~post4#1.base|) (<= 2 |ULTIMATE.start_main_#t~malloc9#1.base|) (<= 2 |ULTIMATE.start_cstrspn_#in~s1#1.base|) (= |ULTIMATE.start_cstrspn_#in~s1#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc9#1.offset| 0) (= 0 |ULTIMATE.start_cstrspn_~s2#1.offset|) (= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 2 |ULTIMATE.start_cstrspn_~p~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 2 |ULTIMATE.start_main_#t~malloc8#1.base|) (<= 2 |ULTIMATE.start_cstrspn_#in~s2#1.base|) (<= (select |#length| |ULTIMATE.start_cstrspn_#t~post4#1.base|) |ULTIMATE.start_cstrspn_#t~post4#1.offset|) (<= 2 |ULTIMATE.start_cstrspn_~s1#1.base|) (<= 2 |ULTIMATE.start_main_~nondetString1~0#1.base|) (= |ULTIMATE.start_cstrspn_~s1#1.offset| 0) (= (+ |ULTIMATE.start_cstrspn_#t~post4#1.offset| 1) |ULTIMATE.start_cstrspn_~spanp~0#1.offset|) (<= 2 |ULTIMATE.start_cstrspn_#t~post4#1.base|))' at error location [2023-12-02 08:37:38,050 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 08:37:38,050 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 08:37:38,050 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 25, 25] total 65 [2023-12-02 08:37:38,050 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [683321451] [2023-12-02 08:37:38,050 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 08:37:38,050 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 67 states [2023-12-02 08:37:38,050 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 08:37:38,051 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 67 interpolants. [2023-12-02 08:37:38,051 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=649, Invalid=5512, Unknown=1, NotChecked=0, Total=6162 [2023-12-02 08:37:38,051 INFO L87 Difference]: Start difference. First operand 2484 states and 2960 transitions. Second operand has 67 states, 66 states have (on average 2.5303030303030303) internal successors, (167), 66 states have internal predecessors, (167), 0 states have call successors, (0), 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 08:37:40,393 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 08:37:40,393 INFO L93 Difference]: Finished difference Result 2850 states and 3339 transitions. [2023-12-02 08:37:40,394 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2023-12-02 08:37:40,394 INFO L78 Accepts]: Start accepts. Automaton has has 67 states, 66 states have (on average 2.5303030303030303) internal successors, (167), 66 states have internal predecessors, (167), 0 states have call successors, (0), 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 69 [2023-12-02 08:37:40,394 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 08:37:40,397 INFO L225 Difference]: With dead ends: 2850 [2023-12-02 08:37:40,398 INFO L226 Difference]: Without dead ends: 2850 [2023-12-02 08:37:40,399 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 257 GetRequests, 154 SyntacticMatches, 0 SemanticMatches, 103 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3441 ImplicationChecksByTransitivity, 5.2s TimeCoverageRelationStatistics Valid=1409, Invalid=9510, Unknown=1, NotChecked=0, Total=10920 [2023-12-02 08:37:40,399 INFO L413 NwaCegarLoop]: 48 mSDtfsCounter, 663 mSDsluCounter, 780 mSDsCounter, 0 mSdLazyCounter, 1531 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 663 SdHoareTripleChecker+Valid, 828 SdHoareTripleChecker+Invalid, 1535 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 1531 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2023-12-02 08:37:40,399 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [663 Valid, 828 Invalid, 1535 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 1531 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2023-12-02 08:37:40,402 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2850 states. [2023-12-02 08:37:40,421 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2850 to 2544. [2023-12-02 08:37:40,422 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2544 states, 2542 states have (on average 1.1935483870967742) internal successors, (3034), 2543 states have internal predecessors, (3034), 0 states have call successors, (0), 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 08:37:40,425 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2544 states to 2544 states and 3034 transitions. [2023-12-02 08:37:40,425 INFO L78 Accepts]: Start accepts. Automaton has 2544 states and 3034 transitions. Word has length 69 [2023-12-02 08:37:40,425 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 08:37:40,425 INFO L495 AbstractCegarLoop]: Abstraction has 2544 states and 3034 transitions. [2023-12-02 08:37:40,426 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 67 states, 66 states have (on average 2.5303030303030303) internal successors, (167), 66 states have internal predecessors, (167), 0 states have call successors, (0), 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 08:37:40,426 INFO L276 IsEmpty]: Start isEmpty. Operand 2544 states and 3034 transitions. [2023-12-02 08:37:40,427 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2023-12-02 08:37:40,428 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 08:37:40,428 INFO L195 NwaCegarLoop]: trace histogram [9, 8, 8, 8, 8, 8, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 08:37:40,433 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (36)] Ended with exit code 0 [2023-12-02 08:37:40,628 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 36 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable47 [2023-12-02 08:37:40,628 INFO L420 AbstractCegarLoop]: === Iteration 49 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 10 more)] === [2023-12-02 08:37:40,628 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 08:37:40,628 INFO L85 PathProgramCache]: Analyzing trace with hash 1052817821, now seen corresponding path program 14 times [2023-12-02 08:37:40,629 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 08:37:40,629 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1255982940] [2023-12-02 08:37:40,629 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 08:37:40,629 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 08:37:40,655 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 08:37:41,681 INFO L134 CoverageAnalysis]: Checked inductivity of 234 backedges. 16 proven. 217 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 08:37:41,681 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 08:37:41,681 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1255982940] [2023-12-02 08:37:41,681 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1255982940] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 08:37:41,681 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2077080853] [2023-12-02 08:37:41,681 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-12-02 08:37:41,681 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 08:37:41,682 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 08:37:41,682 INFO L229 MonitoredProcess]: Starting monitored process 37 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 08:37:41,683 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (37)] Waiting until timeout for monitored process [2023-12-02 08:37:42,029 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2023-12-02 08:37:42,029 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 08:37:42,034 INFO L262 TraceCheckSpWp]: Trace formula consists of 493 conjuncts, 109 conjunts are in the unsatisfiable core [2023-12-02 08:37:42,037 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 08:37:42,040 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2023-12-02 08:37:42,346 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 13 treesize of output 9 [2023-12-02 08:37:42,382 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 18 treesize of output 13 [2023-12-02 08:37:42,681 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 7 treesize of output 3 [2023-12-02 08:37:42,754 INFO L134 CoverageAnalysis]: Checked inductivity of 234 backedges. 16 proven. 217 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 08:37:42,754 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 08:37:42,939 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 13 [2023-12-02 08:37:42,941 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2023-12-02 08:37:43,091 INFO L134 CoverageAnalysis]: Checked inductivity of 234 backedges. 16 proven. 217 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 08:37:43,091 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2077080853] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 08:37:43,092 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1638479207] [2023-12-02 08:37:43,092 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2023-12-02 08:37:43,092 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 08:37:43,093 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 08:37:43,093 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 08:37:43,093 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 08:37:44,039 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 08:37:45,320 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '89191#(or (< (select |#length| |ULTIMATE.start_cstrspn_#t~post2#1.base|) (+ |ULTIMATE.start_cstrspn_#t~post2#1.offset| 1)) (< |ULTIMATE.start_cstrspn_#t~post2#1.offset| 0))' at error location [2023-12-02 08:37:45,320 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 08:37:45,320 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 08:37:45,320 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 23, 23] total 52 [2023-12-02 08:37:45,321 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1407835127] [2023-12-02 08:37:45,321 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 08:37:45,321 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 53 states [2023-12-02 08:37:45,321 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 08:37:45,321 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2023-12-02 08:37:45,322 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=162, Invalid=3870, Unknown=0, NotChecked=0, Total=4032 [2023-12-02 08:37:45,322 INFO L87 Difference]: Start difference. First operand 2544 states and 3034 transitions. Second operand has 53 states, 53 states have (on average 2.660377358490566) internal successors, (141), 52 states have internal predecessors, (141), 0 states have call successors, (0), 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 08:37:48,002 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 08:37:48,002 INFO L93 Difference]: Finished difference Result 4573 states and 5394 transitions. [2023-12-02 08:37:48,002 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2023-12-02 08:37:48,002 INFO L78 Accepts]: Start accepts. Automaton has has 53 states, 53 states have (on average 2.660377358490566) internal successors, (141), 52 states have internal predecessors, (141), 0 states have call successors, (0), 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 71 [2023-12-02 08:37:48,003 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 08:37:48,006 INFO L225 Difference]: With dead ends: 4573 [2023-12-02 08:37:48,006 INFO L226 Difference]: Without dead ends: 2963 [2023-12-02 08:37:48,006 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 276 GetRequests, 177 SyntacticMatches, 1 SemanticMatches, 98 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1496 ImplicationChecksByTransitivity, 4.0s TimeCoverageRelationStatistics Valid=555, Invalid=9345, Unknown=0, NotChecked=0, Total=9900 [2023-12-02 08:37:48,007 INFO L413 NwaCegarLoop]: 45 mSDtfsCounter, 350 mSDsluCounter, 1490 mSDsCounter, 0 mSdLazyCounter, 2643 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 350 SdHoareTripleChecker+Valid, 1535 SdHoareTripleChecker+Invalid, 2655 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 2643 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.1s IncrementalHoareTripleChecker+Time [2023-12-02 08:37:48,007 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [350 Valid, 1535 Invalid, 2655 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 2643 Invalid, 0 Unknown, 0 Unchecked, 1.1s Time] [2023-12-02 08:37:48,009 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2963 states. [2023-12-02 08:37:48,027 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2963 to 2617. [2023-12-02 08:37:48,029 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2617 states, 2615 states have (on average 1.1934990439770554) internal successors, (3121), 2616 states have internal predecessors, (3121), 0 states have call successors, (0), 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 08:37:48,031 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2617 states to 2617 states and 3121 transitions. [2023-12-02 08:37:48,032 INFO L78 Accepts]: Start accepts. Automaton has 2617 states and 3121 transitions. Word has length 71 [2023-12-02 08:37:48,032 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 08:37:48,032 INFO L495 AbstractCegarLoop]: Abstraction has 2617 states and 3121 transitions. [2023-12-02 08:37:48,032 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 53 states, 53 states have (on average 2.660377358490566) internal successors, (141), 52 states have internal predecessors, (141), 0 states have call successors, (0), 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 08:37:48,032 INFO L276 IsEmpty]: Start isEmpty. Operand 2617 states and 3121 transitions. [2023-12-02 08:37:48,034 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2023-12-02 08:37:48,034 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 08:37:48,034 INFO L195 NwaCegarLoop]: trace histogram [9, 8, 8, 8, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 08:37:48,040 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (37)] Ended with exit code 0 [2023-12-02 08:37:48,234 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 37 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable48 [2023-12-02 08:37:48,235 INFO L420 AbstractCegarLoop]: === Iteration 50 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 10 more)] === [2023-12-02 08:37:48,235 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 08:37:48,235 INFO L85 PathProgramCache]: Analyzing trace with hash -571368821, now seen corresponding path program 15 times [2023-12-02 08:37:48,235 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 08:37:48,235 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1527144138] [2023-12-02 08:37:48,235 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 08:37:48,235 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 08:37:48,255 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 08:37:48,822 INFO L134 CoverageAnalysis]: Checked inductivity of 249 backedges. 36 proven. 212 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 08:37:48,822 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 08:37:48,822 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1527144138] [2023-12-02 08:37:48,822 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1527144138] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 08:37:48,822 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [933665767] [2023-12-02 08:37:48,823 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-12-02 08:37:48,823 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 08:37:48,823 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 08:37:48,823 INFO L229 MonitoredProcess]: Starting monitored process 38 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 08:37:48,825 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (38)] Waiting until timeout for monitored process [2023-12-02 08:37:49,062 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-12-02 08:37:49,062 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 08:37:49,066 INFO L262 TraceCheckSpWp]: Trace formula consists of 506 conjuncts, 95 conjunts are in the unsatisfiable core [2023-12-02 08:37:49,068 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 08:37:49,538 INFO L134 CoverageAnalysis]: Checked inductivity of 249 backedges. 49 proven. 199 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 08:37:49,538 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 08:37:50,020 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2023-12-02 08:37:50,363 INFO L134 CoverageAnalysis]: Checked inductivity of 249 backedges. 49 proven. 199 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 08:37:50,363 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [933665767] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 08:37:50,363 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [890145112] [2023-12-02 08:37:50,364 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2023-12-02 08:37:50,364 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 08:37:50,364 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 08:37:50,365 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 08:37:50,365 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 08:37:51,283 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 08:37:52,319 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '96950#(or (< (select |#length| |ULTIMATE.start_cstrspn_#t~post2#1.base|) (+ |ULTIMATE.start_cstrspn_#t~post2#1.offset| 1)) (< |ULTIMATE.start_cstrspn_#t~post2#1.offset| 0))' at error location [2023-12-02 08:37:52,319 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 08:37:52,319 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 08:37:52,319 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 20, 20] total 52 [2023-12-02 08:37:52,319 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2036752968] [2023-12-02 08:37:52,319 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 08:37:52,320 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 54 states [2023-12-02 08:37:52,320 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 08:37:52,320 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 54 interpolants. [2023-12-02 08:37:52,320 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=357, Invalid=3803, Unknown=0, NotChecked=0, Total=4160 [2023-12-02 08:37:52,321 INFO L87 Difference]: Start difference. First operand 2617 states and 3121 transitions. Second operand has 54 states, 53 states have (on average 3.2264150943396226) internal successors, (171), 53 states have internal predecessors, (171), 0 states have call successors, (0), 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 08:37:53,650 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 08:37:53,650 INFO L93 Difference]: Finished difference Result 2872 states and 3415 transitions. [2023-12-02 08:37:53,651 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2023-12-02 08:37:53,651 INFO L78 Accepts]: Start accepts. Automaton has has 54 states, 53 states have (on average 3.2264150943396226) internal successors, (171), 53 states have internal predecessors, (171), 0 states have call successors, (0), 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 73 [2023-12-02 08:37:53,651 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 08:37:53,654 INFO L225 Difference]: With dead ends: 2872 [2023-12-02 08:37:53,654 INFO L226 Difference]: Without dead ends: 2872 [2023-12-02 08:37:53,655 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 259 GetRequests, 175 SyntacticMatches, 0 SemanticMatches, 84 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1927 ImplicationChecksByTransitivity, 2.7s TimeCoverageRelationStatistics Valid=678, Invalid=6632, Unknown=0, NotChecked=0, Total=7310 [2023-12-02 08:37:53,655 INFO L413 NwaCegarLoop]: 35 mSDtfsCounter, 465 mSDsluCounter, 683 mSDsCounter, 0 mSdLazyCounter, 1442 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 465 SdHoareTripleChecker+Valid, 718 SdHoareTripleChecker+Invalid, 1442 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 1442 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2023-12-02 08:37:53,656 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [465 Valid, 718 Invalid, 1442 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 1442 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2023-12-02 08:37:53,658 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2872 states. [2023-12-02 08:37:53,685 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2872 to 2863. [2023-12-02 08:37:53,688 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2863 states, 2861 states have (on average 1.1936385879063265) internal successors, (3415), 2862 states have internal predecessors, (3415), 0 states have call successors, (0), 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 08:37:53,692 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2863 states to 2863 states and 3415 transitions. [2023-12-02 08:37:53,692 INFO L78 Accepts]: Start accepts. Automaton has 2863 states and 3415 transitions. Word has length 73 [2023-12-02 08:37:53,692 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 08:37:53,692 INFO L495 AbstractCegarLoop]: Abstraction has 2863 states and 3415 transitions. [2023-12-02 08:37:53,693 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 54 states, 53 states have (on average 3.2264150943396226) internal successors, (171), 53 states have internal predecessors, (171), 0 states have call successors, (0), 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 08:37:53,693 INFO L276 IsEmpty]: Start isEmpty. Operand 2863 states and 3415 transitions. [2023-12-02 08:37:53,695 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2023-12-02 08:37:53,695 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 08:37:53,696 INFO L195 NwaCegarLoop]: trace histogram [12, 11, 11, 11, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 08:37:53,702 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (38)] Ended with exit code 0 [2023-12-02 08:37:53,896 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 38 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable49 [2023-12-02 08:37:53,896 INFO L420 AbstractCegarLoop]: === Iteration 51 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 10 more)] === [2023-12-02 08:37:53,896 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 08:37:53,896 INFO L85 PathProgramCache]: Analyzing trace with hash -575799320, now seen corresponding path program 19 times [2023-12-02 08:37:53,897 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 08:37:53,897 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1511608734] [2023-12-02 08:37:53,897 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 08:37:53,897 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 08:37:53,923 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 08:37:54,740 INFO L134 CoverageAnalysis]: Checked inductivity of 342 backedges. 32 proven. 310 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 08:37:54,741 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 08:37:54,741 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1511608734] [2023-12-02 08:37:54,741 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1511608734] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 08:37:54,741 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1901919371] [2023-12-02 08:37:54,741 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-12-02 08:37:54,741 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 08:37:54,741 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 08:37:54,742 INFO L229 MonitoredProcess]: Starting monitored process 39 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 08:37:54,743 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (39)] Waiting until timeout for monitored process [2023-12-02 08:37:54,886 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 08:37:54,889 INFO L262 TraceCheckSpWp]: Trace formula consists of 439 conjuncts, 130 conjunts are in the unsatisfiable core [2023-12-02 08:37:54,891 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 08:37:55,182 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2023-12-02 08:37:55,294 INFO L134 CoverageAnalysis]: Checked inductivity of 342 backedges. 32 proven. 310 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 08:37:55,294 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 08:37:55,355 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 13 [2023-12-02 08:37:55,356 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2023-12-02 08:37:55,446 INFO L134 CoverageAnalysis]: Checked inductivity of 342 backedges. 32 proven. 310 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 08:37:55,447 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1901919371] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 08:37:55,447 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1240437614] [2023-12-02 08:37:55,448 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2023-12-02 08:37:55,448 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 08:37:55,448 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 08:37:55,448 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 08:37:55,448 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 08:37:56,059 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 08:37:58,081 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '103218#(and (<= 2 |ULTIMATE.start_cstrspn_~s2#1.base|) (= |ULTIMATE.start_cstrspn_#in~s2#1.offset| 0) (<= 2 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |ULTIMATE.start_main_#t~malloc8#1.offset| 0) (<= 0 |ULTIMATE.start_cstrspn_#t~post4#1.offset|) (<= 1 |#StackHeapBarrier|) (= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (= |ULTIMATE.start_main_~length1~0#1| 1) (= |ULTIMATE.start_cstrspn_~p~0#1.offset| 1) (= |ULTIMATE.start_cstrspn_~spanp~0#1.base| |ULTIMATE.start_cstrspn_#t~post4#1.base|) (<= 2 |ULTIMATE.start_main_#t~malloc9#1.base|) (<= 2 |ULTIMATE.start_cstrspn_#in~s1#1.base|) (= |ULTIMATE.start_cstrspn_#in~s1#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc9#1.offset| 0) (= 0 |ULTIMATE.start_cstrspn_~s2#1.offset|) (= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 2 |ULTIMATE.start_cstrspn_~p~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 2 |ULTIMATE.start_main_#t~malloc8#1.base|) (<= 2 |ULTIMATE.start_cstrspn_#in~s2#1.base|) (<= (select |#length| |ULTIMATE.start_cstrspn_#t~post4#1.base|) |ULTIMATE.start_cstrspn_#t~post4#1.offset|) (<= 2 |ULTIMATE.start_cstrspn_~s1#1.base|) (<= 2 |ULTIMATE.start_main_~nondetString1~0#1.base|) (= |ULTIMATE.start_cstrspn_~s1#1.offset| 0) (= (+ |ULTIMATE.start_cstrspn_#t~post4#1.offset| 1) |ULTIMATE.start_cstrspn_~spanp~0#1.offset|) (<= 2 |ULTIMATE.start_cstrspn_#t~post4#1.base|))' at error location [2023-12-02 08:37:58,082 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 08:37:58,082 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 08:37:58,082 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 29, 29] total 48 [2023-12-02 08:37:58,082 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1287572967] [2023-12-02 08:37:58,082 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 08:37:58,082 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 48 states [2023-12-02 08:37:58,082 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 08:37:58,083 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2023-12-02 08:37:58,083 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=191, Invalid=3348, Unknown=1, NotChecked=0, Total=3540 [2023-12-02 08:37:58,083 INFO L87 Difference]: Start difference. First operand 2863 states and 3415 transitions. Second operand has 48 states, 48 states have (on average 2.1875) internal successors, (105), 48 states have internal predecessors, (105), 0 states have call successors, (0), 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 08:38:00,082 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 08:38:00,082 INFO L93 Difference]: Finished difference Result 3987 states and 4691 transitions. [2023-12-02 08:38:00,083 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2023-12-02 08:38:00,083 INFO L78 Accepts]: Start accepts. Automaton has has 48 states, 48 states have (on average 2.1875) internal successors, (105), 48 states have internal predecessors, (105), 0 states have call successors, (0), 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 73 [2023-12-02 08:38:00,083 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 08:38:00,089 INFO L225 Difference]: With dead ends: 3987 [2023-12-02 08:38:00,089 INFO L226 Difference]: Without dead ends: 3444 [2023-12-02 08:38:00,090 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 273 GetRequests, 189 SyntacticMatches, 0 SemanticMatches, 84 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1405 ImplicationChecksByTransitivity, 3.6s TimeCoverageRelationStatistics Valid=456, Invalid=6853, Unknown=1, NotChecked=0, Total=7310 [2023-12-02 08:38:00,090 INFO L413 NwaCegarLoop]: 61 mSDtfsCounter, 182 mSDsluCounter, 1968 mSDsCounter, 0 mSdLazyCounter, 2686 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 182 SdHoareTripleChecker+Valid, 2029 SdHoareTripleChecker+Invalid, 2696 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 2686 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.1s IncrementalHoareTripleChecker+Time [2023-12-02 08:38:00,090 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [182 Valid, 2029 Invalid, 2696 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 2686 Invalid, 0 Unknown, 0 Unchecked, 1.1s Time] [2023-12-02 08:38:00,093 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3444 states. [2023-12-02 08:38:00,127 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3444 to 3263. [2023-12-02 08:38:00,129 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3263 states, 3261 states have (on average 1.1953388531125422) internal successors, (3898), 3262 states have internal predecessors, (3898), 0 states have call successors, (0), 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 08:38:00,134 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3263 states to 3263 states and 3898 transitions. [2023-12-02 08:38:00,134 INFO L78 Accepts]: Start accepts. Automaton has 3263 states and 3898 transitions. Word has length 73 [2023-12-02 08:38:00,134 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 08:38:00,134 INFO L495 AbstractCegarLoop]: Abstraction has 3263 states and 3898 transitions. [2023-12-02 08:38:00,134 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 48 states, 48 states have (on average 2.1875) internal successors, (105), 48 states have internal predecessors, (105), 0 states have call successors, (0), 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 08:38:00,135 INFO L276 IsEmpty]: Start isEmpty. Operand 3263 states and 3898 transitions. [2023-12-02 08:38:00,137 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2023-12-02 08:38:00,138 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 08:38:00,138 INFO L195 NwaCegarLoop]: trace histogram [12, 11, 11, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 08:38:00,143 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (39)] Ended with exit code 0 [2023-12-02 08:38:00,338 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable50,39 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 08:38:00,338 INFO L420 AbstractCegarLoop]: === Iteration 52 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 10 more)] === [2023-12-02 08:38:00,339 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 08:38:00,339 INFO L85 PathProgramCache]: Analyzing trace with hash -362347219, now seen corresponding path program 20 times [2023-12-02 08:38:00,339 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 08:38:00,339 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1045702117] [2023-12-02 08:38:00,339 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 08:38:00,339 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 08:38:00,366 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 08:38:01,215 INFO L134 CoverageAnalysis]: Checked inductivity of 363 backedges. 81 proven. 282 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 08:38:01,216 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 08:38:01,216 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1045702117] [2023-12-02 08:38:01,216 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1045702117] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 08:38:01,216 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1619653478] [2023-12-02 08:38:01,216 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-12-02 08:38:01,216 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 08:38:01,216 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 08:38:01,217 INFO L229 MonitoredProcess]: Starting monitored process 40 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 08:38:01,218 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (40)] Waiting until timeout for monitored process [2023-12-02 08:38:01,544 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 12 check-sat command(s) [2023-12-02 08:38:01,544 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 08:38:01,548 INFO L262 TraceCheckSpWp]: Trace formula consists of 452 conjuncts, 97 conjunts are in the unsatisfiable core [2023-12-02 08:38:01,551 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 08:38:02,328 INFO L134 CoverageAnalysis]: Checked inductivity of 363 backedges. 100 proven. 263 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 08:38:02,328 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 08:38:03,099 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 7 treesize of output 5 [2023-12-02 08:38:03,383 INFO L134 CoverageAnalysis]: Checked inductivity of 363 backedges. 100 proven. 263 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 08:38:03,384 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1619653478] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 08:38:03,384 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [253780814] [2023-12-02 08:38:03,385 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2023-12-02 08:38:03,385 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 08:38:03,385 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 08:38:03,385 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 08:38:03,385 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 08:38:03,992 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 08:38:06,069 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '111048#(and (<= 2 |ULTIMATE.start_cstrspn_~s2#1.base|) (= |ULTIMATE.start_cstrspn_#in~s2#1.offset| 0) (<= 2 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |ULTIMATE.start_main_#t~malloc8#1.offset| 0) (<= 0 |ULTIMATE.start_cstrspn_#t~post4#1.offset|) (<= 1 |#StackHeapBarrier|) (= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (= |ULTIMATE.start_main_~length1~0#1| 1) (= |ULTIMATE.start_cstrspn_~p~0#1.offset| 1) (= |ULTIMATE.start_cstrspn_~spanp~0#1.base| |ULTIMATE.start_cstrspn_#t~post4#1.base|) (<= 2 |ULTIMATE.start_main_#t~malloc9#1.base|) (<= 2 |ULTIMATE.start_cstrspn_#in~s1#1.base|) (= |ULTIMATE.start_cstrspn_#in~s1#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc9#1.offset| 0) (= 0 |ULTIMATE.start_cstrspn_~s2#1.offset|) (= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 2 |ULTIMATE.start_cstrspn_~p~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 2 |ULTIMATE.start_main_#t~malloc8#1.base|) (<= 2 |ULTIMATE.start_cstrspn_#in~s2#1.base|) (<= (select |#length| |ULTIMATE.start_cstrspn_#t~post4#1.base|) |ULTIMATE.start_cstrspn_#t~post4#1.offset|) (<= 2 |ULTIMATE.start_cstrspn_~s1#1.base|) (<= 2 |ULTIMATE.start_main_~nondetString1~0#1.base|) (= |ULTIMATE.start_cstrspn_~s1#1.offset| 0) (= (+ |ULTIMATE.start_cstrspn_#t~post4#1.offset| 1) |ULTIMATE.start_cstrspn_~spanp~0#1.offset|) (<= 2 |ULTIMATE.start_cstrspn_#t~post4#1.base|))' at error location [2023-12-02 08:38:06,070 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 08:38:06,070 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 08:38:06,070 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 28, 28] total 71 [2023-12-02 08:38:06,070 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1330165677] [2023-12-02 08:38:06,070 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 08:38:06,071 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 72 states [2023-12-02 08:38:06,071 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 08:38:06,071 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 72 interpolants. [2023-12-02 08:38:06,072 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=754, Invalid=6215, Unknown=3, NotChecked=0, Total=6972 [2023-12-02 08:38:06,072 INFO L87 Difference]: Start difference. First operand 3263 states and 3898 transitions. Second operand has 72 states, 71 states have (on average 2.8028169014084505) internal successors, (199), 72 states have internal predecessors, (199), 0 states have call successors, (0), 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 08:38:07,806 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 08:38:07,806 INFO L93 Difference]: Finished difference Result 3712 states and 4362 transitions. [2023-12-02 08:38:07,807 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2023-12-02 08:38:07,807 INFO L78 Accepts]: Start accepts. Automaton has has 72 states, 71 states have (on average 2.8028169014084505) internal successors, (199), 72 states have internal predecessors, (199), 0 states have call successors, (0), 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 75 [2023-12-02 08:38:07,807 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 08:38:07,812 INFO L225 Difference]: With dead ends: 3712 [2023-12-02 08:38:07,812 INFO L226 Difference]: Without dead ends: 3712 [2023-12-02 08:38:07,813 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 279 GetRequests, 157 SyntacticMatches, 12 SemanticMatches, 110 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4655 ImplicationChecksByTransitivity, 5.0s TimeCoverageRelationStatistics Valid=1424, Invalid=11005, Unknown=3, NotChecked=0, Total=12432 [2023-12-02 08:38:07,813 INFO L413 NwaCegarLoop]: 55 mSDtfsCounter, 514 mSDsluCounter, 736 mSDsCounter, 0 mSdLazyCounter, 1313 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 514 SdHoareTripleChecker+Valid, 791 SdHoareTripleChecker+Invalid, 1314 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 1313 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2023-12-02 08:38:07,813 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [514 Valid, 791 Invalid, 1314 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 1313 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2023-12-02 08:38:07,816 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3712 states. [2023-12-02 08:38:07,843 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3712 to 3331. [2023-12-02 08:38:07,845 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3331 states, 3329 states have (on average 1.1961550015019526) internal successors, (3982), 3330 states have internal predecessors, (3982), 0 states have call successors, (0), 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 08:38:07,849 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3331 states to 3331 states and 3982 transitions. [2023-12-02 08:38:07,849 INFO L78 Accepts]: Start accepts. Automaton has 3331 states and 3982 transitions. Word has length 75 [2023-12-02 08:38:07,849 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 08:38:07,849 INFO L495 AbstractCegarLoop]: Abstraction has 3331 states and 3982 transitions. [2023-12-02 08:38:07,850 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 72 states, 71 states have (on average 2.8028169014084505) internal successors, (199), 72 states have internal predecessors, (199), 0 states have call successors, (0), 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 08:38:07,850 INFO L276 IsEmpty]: Start isEmpty. Operand 3331 states and 3982 transitions. [2023-12-02 08:38:07,852 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2023-12-02 08:38:07,852 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 08:38:07,852 INFO L195 NwaCegarLoop]: trace histogram [10, 9, 9, 9, 9, 9, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 08:38:07,859 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (40)] Ended with exit code 0 [2023-12-02 08:38:08,053 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable51,40 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 08:38:08,053 INFO L420 AbstractCegarLoop]: === Iteration 53 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 10 more)] === [2023-12-02 08:38:08,053 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 08:38:08,053 INFO L85 PathProgramCache]: Analyzing trace with hash 1764146993, now seen corresponding path program 16 times [2023-12-02 08:38:08,053 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 08:38:08,053 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [679539181] [2023-12-02 08:38:08,053 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 08:38:08,054 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 08:38:08,092 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 08:38:09,203 INFO L134 CoverageAnalysis]: Checked inductivity of 299 backedges. 18 proven. 280 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 08:38:09,203 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 08:38:09,203 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [679539181] [2023-12-02 08:38:09,203 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [679539181] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 08:38:09,203 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1707377974] [2023-12-02 08:38:09,203 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-12-02 08:38:09,203 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 08:38:09,203 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 08:38:09,204 INFO L229 MonitoredProcess]: Starting monitored process 41 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 08:38:09,205 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (41)] Waiting until timeout for monitored process [2023-12-02 08:38:09,458 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 08:38:09,462 INFO L262 TraceCheckSpWp]: Trace formula consists of 543 conjuncts, 115 conjunts are in the unsatisfiable core [2023-12-02 08:38:09,464 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 08:38:09,469 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2023-12-02 08:38:09,554 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 13 treesize of output 9 [2023-12-02 08:38:09,562 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 18 treesize of output 13 [2023-12-02 08:38:09,885 INFO L134 CoverageAnalysis]: Checked inductivity of 299 backedges. 18 proven. 280 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 08:38:09,885 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 08:38:10,042 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-12-02 08:38:10,043 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 23 treesize of output 24 [2023-12-02 08:38:10,049 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-12-02 08:38:10,049 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 37 treesize of output 32 [2023-12-02 08:38:10,226 INFO L134 CoverageAnalysis]: Checked inductivity of 299 backedges. 18 proven. 280 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 08:38:10,226 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1707377974] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 08:38:10,226 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1671822367] [2023-12-02 08:38:10,227 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2023-12-02 08:38:10,227 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 08:38:10,227 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 08:38:10,227 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 08:38:10,227 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 08:38:11,143 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 08:38:12,329 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '118672#(or (< (select |#length| |ULTIMATE.start_cstrspn_#t~post2#1.base|) (+ |ULTIMATE.start_cstrspn_#t~post2#1.offset| 1)) (< |ULTIMATE.start_cstrspn_#t~post2#1.offset| 0))' at error location [2023-12-02 08:38:12,329 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 08:38:12,329 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 08:38:12,329 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 25, 25] total 44 [2023-12-02 08:38:12,330 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [782659008] [2023-12-02 08:38:12,330 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 08:38:12,330 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 45 states [2023-12-02 08:38:12,330 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 08:38:12,331 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2023-12-02 08:38:12,331 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=132, Invalid=2935, Unknown=13, NotChecked=0, Total=3080 [2023-12-02 08:38:12,331 INFO L87 Difference]: Start difference. First operand 3331 states and 3982 transitions. Second operand has 45 states, 45 states have (on average 3.022222222222222) internal successors, (136), 44 states have internal predecessors, (136), 0 states have call successors, (0), 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 08:38:15,039 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 08:38:15,039 INFO L93 Difference]: Finished difference Result 6026 states and 7135 transitions. [2023-12-02 08:38:15,040 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 53 states. [2023-12-02 08:38:15,040 INFO L78 Accepts]: Start accepts. Automaton has has 45 states, 45 states have (on average 3.022222222222222) internal successors, (136), 44 states have internal predecessors, (136), 0 states have call successors, (0), 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 79 [2023-12-02 08:38:15,040 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 08:38:15,043 INFO L225 Difference]: With dead ends: 6026 [2023-12-02 08:38:15,043 INFO L226 Difference]: Without dead ends: 3837 [2023-12-02 08:38:15,043 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 304 GetRequests, 212 SyntacticMatches, 0 SemanticMatches, 92 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1219 ImplicationChecksByTransitivity, 3.5s TimeCoverageRelationStatistics Valid=504, Invalid=8225, Unknown=13, NotChecked=0, Total=8742 [2023-12-02 08:38:15,044 INFO L413 NwaCegarLoop]: 51 mSDtfsCounter, 468 mSDsluCounter, 1468 mSDsCounter, 0 mSdLazyCounter, 2762 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 468 SdHoareTripleChecker+Valid, 1519 SdHoareTripleChecker+Invalid, 2775 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 2762 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.2s IncrementalHoareTripleChecker+Time [2023-12-02 08:38:15,044 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [468 Valid, 1519 Invalid, 2775 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 2762 Invalid, 0 Unknown, 0 Unchecked, 1.2s Time] [2023-12-02 08:38:15,046 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3837 states. [2023-12-02 08:38:15,071 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3837 to 3410. [2023-12-02 08:38:15,073 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3410 states, 3408 states have (on average 1.1960093896713615) internal successors, (4076), 3409 states have internal predecessors, (4076), 0 states have call successors, (0), 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 08:38:15,077 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3410 states to 3410 states and 4076 transitions. [2023-12-02 08:38:15,077 INFO L78 Accepts]: Start accepts. Automaton has 3410 states and 4076 transitions. Word has length 79 [2023-12-02 08:38:15,077 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 08:38:15,077 INFO L495 AbstractCegarLoop]: Abstraction has 3410 states and 4076 transitions. [2023-12-02 08:38:15,078 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 45 states, 45 states have (on average 3.022222222222222) internal successors, (136), 44 states have internal predecessors, (136), 0 states have call successors, (0), 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 08:38:15,078 INFO L276 IsEmpty]: Start isEmpty. Operand 3410 states and 4076 transitions. [2023-12-02 08:38:15,081 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2023-12-02 08:38:15,081 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 08:38:15,081 INFO L195 NwaCegarLoop]: trace histogram [13, 12, 12, 12, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 08:38:15,088 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (41)] Ended with exit code 0 [2023-12-02 08:38:15,281 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable52,41 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 08:38:15,282 INFO L420 AbstractCegarLoop]: === Iteration 54 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 10 more)] === [2023-12-02 08:38:15,282 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 08:38:15,282 INFO L85 PathProgramCache]: Analyzing trace with hash -1450871375, now seen corresponding path program 21 times [2023-12-02 08:38:15,282 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 08:38:15,282 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2001436898] [2023-12-02 08:38:15,282 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 08:38:15,282 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 08:38:15,308 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 08:38:16,256 INFO L134 CoverageAnalysis]: Checked inductivity of 409 backedges. 35 proven. 374 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 08:38:16,257 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 08:38:16,257 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2001436898] [2023-12-02 08:38:16,257 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2001436898] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 08:38:16,257 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1432010708] [2023-12-02 08:38:16,257 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-12-02 08:38:16,257 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 08:38:16,257 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 08:38:16,258 INFO L229 MonitoredProcess]: Starting monitored process 42 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 08:38:16,259 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (42)] Waiting until timeout for monitored process [2023-12-02 08:38:16,475 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-12-02 08:38:16,475 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 08:38:16,480 INFO L262 TraceCheckSpWp]: Trace formula consists of 470 conjuncts, 146 conjunts are in the unsatisfiable core [2023-12-02 08:38:16,482 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 08:38:16,844 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2023-12-02 08:38:21,072 INFO L349 Elim1Store]: treesize reduction 13, result has 48.0 percent of original size [2023-12-02 08:38:21,072 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 4 new quantified variables, introduced 6 case distinctions, treesize of input 38 treesize of output 26 [2023-12-02 08:38:21,075 INFO L134 CoverageAnalysis]: Checked inductivity of 409 backedges. 43 proven. 362 refuted. 4 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 08:38:21,075 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 08:38:22,551 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 46 treesize of output 40 [2023-12-02 08:38:22,555 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-12-02 08:38:22,556 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 46 treesize of output 34 [2023-12-02 08:38:22,923 INFO L134 CoverageAnalysis]: Checked inductivity of 409 backedges. 47 proven. 362 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 08:38:22,924 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1432010708] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 08:38:22,924 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1449436437] [2023-12-02 08:38:22,924 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2023-12-02 08:38:22,924 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 08:38:22,925 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 08:38:22,925 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 08:38:22,925 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 08:38:23,549 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 08:38:26,120 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '128748#(and (<= 2 |ULTIMATE.start_cstrspn_~s2#1.base|) (= |ULTIMATE.start_cstrspn_#in~s2#1.offset| 0) (<= 2 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |ULTIMATE.start_main_#t~malloc8#1.offset| 0) (<= 0 |ULTIMATE.start_cstrspn_#t~post4#1.offset|) (<= 1 |#StackHeapBarrier|) (= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (= |ULTIMATE.start_main_~length1~0#1| 1) (= |ULTIMATE.start_cstrspn_~p~0#1.offset| 1) (= |ULTIMATE.start_cstrspn_~spanp~0#1.base| |ULTIMATE.start_cstrspn_#t~post4#1.base|) (<= 2 |ULTIMATE.start_main_#t~malloc9#1.base|) (<= 2 |ULTIMATE.start_cstrspn_#in~s1#1.base|) (= |ULTIMATE.start_cstrspn_#in~s1#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc9#1.offset| 0) (= 0 |ULTIMATE.start_cstrspn_~s2#1.offset|) (= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 2 |ULTIMATE.start_cstrspn_~p~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 2 |ULTIMATE.start_main_#t~malloc8#1.base|) (<= 2 |ULTIMATE.start_cstrspn_#in~s2#1.base|) (<= (select |#length| |ULTIMATE.start_cstrspn_#t~post4#1.base|) |ULTIMATE.start_cstrspn_#t~post4#1.offset|) (<= 2 |ULTIMATE.start_cstrspn_~s1#1.base|) (<= 2 |ULTIMATE.start_main_~nondetString1~0#1.base|) (= |ULTIMATE.start_cstrspn_~s1#1.offset| 0) (= (+ |ULTIMATE.start_cstrspn_#t~post4#1.offset| 1) |ULTIMATE.start_cstrspn_~spanp~0#1.offset|) (<= 2 |ULTIMATE.start_cstrspn_#t~post4#1.base|))' at error location [2023-12-02 08:38:26,120 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 08:38:26,120 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 08:38:26,120 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 35, 35] total 85 [2023-12-02 08:38:26,120 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1183962099] [2023-12-02 08:38:26,120 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 08:38:26,121 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 85 states [2023-12-02 08:38:26,121 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 08:38:26,121 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 85 interpolants. [2023-12-02 08:38:26,122 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=416, Invalid=8892, Unknown=4, NotChecked=0, Total=9312 [2023-12-02 08:38:26,122 INFO L87 Difference]: Start difference. First operand 3410 states and 4076 transitions. Second operand has 85 states, 85 states have (on average 2.4352941176470586) internal successors, (207), 85 states have internal predecessors, (207), 0 states have call successors, (0), 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 08:38:41,227 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 08:38:41,227 INFO L93 Difference]: Finished difference Result 5027 states and 5879 transitions. [2023-12-02 08:38:41,228 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 62 states. [2023-12-02 08:38:41,228 INFO L78 Accepts]: Start accepts. Automaton has has 85 states, 85 states have (on average 2.4352941176470586) internal successors, (207), 85 states have internal predecessors, (207), 0 states have call successors, (0), 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 79 [2023-12-02 08:38:41,228 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 08:38:41,230 INFO L225 Difference]: With dead ends: 5027 [2023-12-02 08:38:41,230 INFO L226 Difference]: Without dead ends: 4365 [2023-12-02 08:38:41,231 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 315 GetRequests, 171 SyntacticMatches, 1 SemanticMatches, 143 ConstructedPredicates, 0 IntricatePredicates, 11 DeprecatedPredicates, 5527 ImplicationChecksByTransitivity, 21.6s TimeCoverageRelationStatistics Valid=1272, Invalid=19603, Unknown=5, NotChecked=0, Total=20880 [2023-12-02 08:38:41,231 INFO L413 NwaCegarLoop]: 70 mSDtfsCounter, 915 mSDsluCounter, 2374 mSDsCounter, 0 mSdLazyCounter, 3281 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 915 SdHoareTripleChecker+Valid, 2444 SdHoareTripleChecker+Invalid, 3290 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 3281 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.0s IncrementalHoareTripleChecker+Time [2023-12-02 08:38:41,232 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [915 Valid, 2444 Invalid, 3290 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 3281 Invalid, 0 Unknown, 0 Unchecked, 2.0s Time] [2023-12-02 08:38:41,234 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4365 states. [2023-12-02 08:38:41,261 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4365 to 3848. [2023-12-02 08:38:41,263 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3848 states, 3846 states have (on average 1.1976079043161727) internal successors, (4606), 3847 states have internal predecessors, (4606), 0 states have call successors, (0), 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 08:38:41,267 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3848 states to 3848 states and 4606 transitions. [2023-12-02 08:38:41,267 INFO L78 Accepts]: Start accepts. Automaton has 3848 states and 4606 transitions. Word has length 79 [2023-12-02 08:38:41,267 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 08:38:41,267 INFO L495 AbstractCegarLoop]: Abstraction has 3848 states and 4606 transitions. [2023-12-02 08:38:41,267 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 85 states, 85 states have (on average 2.4352941176470586) internal successors, (207), 85 states have internal predecessors, (207), 0 states have call successors, (0), 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 08:38:41,267 INFO L276 IsEmpty]: Start isEmpty. Operand 3848 states and 4606 transitions. [2023-12-02 08:38:41,269 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2023-12-02 08:38:41,269 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 08:38:41,270 INFO L195 NwaCegarLoop]: trace histogram [10, 9, 9, 9, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 08:38:41,275 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (42)] Ended with exit code 0 [2023-12-02 08:38:41,470 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 42 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable53 [2023-12-02 08:38:41,470 INFO L420 AbstractCegarLoop]: === Iteration 55 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 10 more)] === [2023-12-02 08:38:41,470 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 08:38:41,470 INFO L85 PathProgramCache]: Analyzing trace with hash -1860775393, now seen corresponding path program 17 times [2023-12-02 08:38:41,470 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 08:38:41,471 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [976122982] [2023-12-02 08:38:41,471 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 08:38:41,471 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 08:38:41,493 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 08:38:42,152 INFO L134 CoverageAnalysis]: Checked inductivity of 316 backedges. 49 proven. 266 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 08:38:42,152 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 08:38:42,152 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [976122982] [2023-12-02 08:38:42,152 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [976122982] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 08:38:42,152 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1951895041] [2023-12-02 08:38:42,152 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-12-02 08:38:42,152 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 08:38:42,152 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 08:38:42,153 INFO L229 MonitoredProcess]: Starting monitored process 43 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 08:38:42,154 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (43)] Waiting until timeout for monitored process [2023-12-02 08:38:42,609 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2023-12-02 08:38:42,609 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 08:38:42,613 INFO L262 TraceCheckSpWp]: Trace formula consists of 556 conjuncts, 98 conjunts are in the unsatisfiable core [2023-12-02 08:38:42,616 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 08:38:42,623 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 08:38:42,625 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 1 [2023-12-02 08:38:42,627 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2023-12-02 08:38:42,933 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 14 treesize of output 10 [2023-12-02 08:38:43,000 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 19 treesize of output 14 [2023-12-02 08:39:07,856 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-12-02 08:39:07,857 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 7 [2023-12-02 08:39:07,989 INFO L134 CoverageAnalysis]: Checked inductivity of 316 backedges. 64 proven. 251 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 08:39:07,989 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 08:39:10,072 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-12-02 08:39:10,072 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 23 treesize of output 24 [2023-12-02 08:39:10,083 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-12-02 08:39:10,083 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 37 treesize of output 34 [2023-12-02 08:39:10,089 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2023-12-02 08:39:11,022 INFO L134 CoverageAnalysis]: Checked inductivity of 316 backedges. 64 proven. 251 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 08:39:11,022 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1951895041] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 08:39:11,022 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [805336409] [2023-12-02 08:39:11,023 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2023-12-02 08:39:11,023 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 08:39:11,023 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 08:39:11,023 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 08:39:11,024 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 08:39:12,187 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 08:39:14,535 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '138285#(and (= |ULTIMATE.start_cstrspn_#in~s2#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc8#1.offset| 0) (<= 0 |ULTIMATE.start_cstrspn_#t~post2#1.offset|) (= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (= |ULTIMATE.start_cstrspn_#in~s1#1.offset| 0) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (= |ULTIMATE.start_main_#t~malloc9#1.offset| 0) (= 0 |ULTIMATE.start_cstrspn_~s2#1.offset|) (= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 1 |ULTIMATE.start_cstrspn_~p~0#1.offset|) (= |ULTIMATE.start_cstrspn_~s1#1.offset| 0) (<= (select |#length| |ULTIMATE.start_cstrspn_#t~post2#1.base|) |ULTIMATE.start_cstrspn_#t~post2#1.offset|))' at error location [2023-12-02 08:39:14,536 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 08:39:14,536 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 08:39:14,536 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 24, 25] total 72 [2023-12-02 08:39:14,536 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [45782515] [2023-12-02 08:39:14,536 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 08:39:14,536 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 74 states [2023-12-02 08:39:14,536 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 08:39:14,537 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 74 interpolants. [2023-12-02 08:39:14,537 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=667, Invalid=6811, Unknown=4, NotChecked=0, Total=7482 [2023-12-02 08:39:14,538 INFO L87 Difference]: Start difference. First operand 3848 states and 4606 transitions. Second operand has 74 states, 73 states have (on average 3.328767123287671) internal successors, (243), 73 states have internal predecessors, (243), 0 states have call successors, (0), 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 08:39:39,181 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 08:39:39,181 INFO L93 Difference]: Finished difference Result 4960 states and 5926 transitions. [2023-12-02 08:39:39,181 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 88 states. [2023-12-02 08:39:39,182 INFO L78 Accepts]: Start accepts. Automaton has has 74 states, 73 states have (on average 3.328767123287671) internal successors, (243), 73 states have internal predecessors, (243), 0 states have call successors, (0), 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 81 [2023-12-02 08:39:39,182 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 08:39:39,185 INFO L225 Difference]: With dead ends: 4960 [2023-12-02 08:39:39,185 INFO L226 Difference]: Without dead ends: 4960 [2023-12-02 08:39:39,186 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 340 GetRequests, 179 SyntacticMatches, 0 SemanticMatches, 161 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7699 ImplicationChecksByTransitivity, 52.4s TimeCoverageRelationStatistics Valid=2811, Invalid=23586, Unknown=9, NotChecked=0, Total=26406 [2023-12-02 08:39:39,186 INFO L413 NwaCegarLoop]: 22 mSDtfsCounter, 481 mSDsluCounter, 547 mSDsCounter, 0 mSdLazyCounter, 2159 mSolverCounterSat, 10 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 481 SdHoareTripleChecker+Valid, 569 SdHoareTripleChecker+Invalid, 2170 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 2159 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.5s IncrementalHoareTripleChecker+Time [2023-12-02 08:39:39,186 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [481 Valid, 569 Invalid, 2170 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 2159 Invalid, 1 Unknown, 0 Unchecked, 1.5s Time] [2023-12-02 08:39:39,189 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4960 states. [2023-12-02 08:39:39,220 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4960 to 4524. [2023-12-02 08:39:39,223 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 4524 states, 4522 states have (on average 1.1981424148606812) internal successors, (5418), 4523 states have internal predecessors, (5418), 0 states have call successors, (0), 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 08:39:39,227 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4524 states to 4524 states and 5418 transitions. [2023-12-02 08:39:39,228 INFO L78 Accepts]: Start accepts. Automaton has 4524 states and 5418 transitions. Word has length 81 [2023-12-02 08:39:39,228 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 08:39:39,228 INFO L495 AbstractCegarLoop]: Abstraction has 4524 states and 5418 transitions. [2023-12-02 08:39:39,228 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 74 states, 73 states have (on average 3.328767123287671) internal successors, (243), 73 states have internal predecessors, (243), 0 states have call successors, (0), 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 08:39:39,228 INFO L276 IsEmpty]: Start isEmpty. Operand 4524 states and 5418 transitions. [2023-12-02 08:39:39,231 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2023-12-02 08:39:39,231 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 08:39:39,231 INFO L195 NwaCegarLoop]: trace histogram [13, 12, 12, 12, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 08:39:39,237 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (43)] Ended with exit code 0 [2023-12-02 08:39:39,431 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 43 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable54 [2023-12-02 08:39:39,431 INFO L420 AbstractCegarLoop]: === Iteration 56 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 10 more)] === [2023-12-02 08:39:39,432 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 08:39:39,432 INFO L85 PathProgramCache]: Analyzing trace with hash 1219801910, now seen corresponding path program 22 times [2023-12-02 08:39:39,432 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 08:39:39,432 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2035700479] [2023-12-02 08:39:39,432 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 08:39:39,432 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 08:39:39,451 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 08:39:40,621 INFO L134 CoverageAnalysis]: Checked inductivity of 432 backedges. 100 proven. 332 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 08:39:40,621 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 08:39:40,621 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2035700479] [2023-12-02 08:39:40,621 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2035700479] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 08:39:40,621 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [479806404] [2023-12-02 08:39:40,621 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-12-02 08:39:40,621 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 08:39:40,622 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 08:39:40,622 INFO L229 MonitoredProcess]: Starting monitored process 44 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 08:39:40,623 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (44)] Waiting until timeout for monitored process [2023-12-02 08:39:40,786 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 08:39:40,790 INFO L262 TraceCheckSpWp]: Trace formula consists of 483 conjuncts, 126 conjunts are in the unsatisfiable core [2023-12-02 08:39:40,793 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 08:39:41,450 INFO L134 CoverageAnalysis]: Checked inductivity of 432 backedges. 121 proven. 311 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 08:39:41,450 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 08:39:42,214 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 5 treesize of output 3 [2023-12-02 08:39:42,533 INFO L134 CoverageAnalysis]: Checked inductivity of 432 backedges. 121 proven. 311 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 08:39:42,534 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [479806404] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 08:39:42,534 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [200035842] [2023-12-02 08:39:42,535 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2023-12-02 08:39:42,535 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 08:39:42,535 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 08:39:42,535 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 08:39:42,535 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 08:39:43,135 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 08:39:45,239 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '148478#(and (<= 2 |ULTIMATE.start_cstrspn_~s2#1.base|) (= |ULTIMATE.start_cstrspn_#in~s2#1.offset| 0) (<= 2 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |ULTIMATE.start_main_#t~malloc8#1.offset| 0) (<= 0 |ULTIMATE.start_cstrspn_#t~post4#1.offset|) (<= 1 |#StackHeapBarrier|) (= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (= |ULTIMATE.start_main_~length1~0#1| 1) (= |ULTIMATE.start_cstrspn_~p~0#1.offset| 1) (= |ULTIMATE.start_cstrspn_~spanp~0#1.base| |ULTIMATE.start_cstrspn_#t~post4#1.base|) (<= 2 |ULTIMATE.start_main_#t~malloc9#1.base|) (<= 2 |ULTIMATE.start_cstrspn_#in~s1#1.base|) (= |ULTIMATE.start_cstrspn_#in~s1#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc9#1.offset| 0) (= 0 |ULTIMATE.start_cstrspn_~s2#1.offset|) (= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 2 |ULTIMATE.start_cstrspn_~p~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 2 |ULTIMATE.start_main_#t~malloc8#1.base|) (<= 2 |ULTIMATE.start_cstrspn_#in~s2#1.base|) (<= (select |#length| |ULTIMATE.start_cstrspn_#t~post4#1.base|) |ULTIMATE.start_cstrspn_#t~post4#1.offset|) (<= 2 |ULTIMATE.start_cstrspn_~s1#1.base|) (<= 2 |ULTIMATE.start_main_~nondetString1~0#1.base|) (= |ULTIMATE.start_cstrspn_~s1#1.offset| 0) (= (+ |ULTIMATE.start_cstrspn_#t~post4#1.offset| 1) |ULTIMATE.start_cstrspn_~spanp~0#1.offset|) (<= 2 |ULTIMATE.start_cstrspn_#t~post4#1.base|))' at error location [2023-12-02 08:39:45,240 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 08:39:45,240 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 08:39:45,240 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 30, 30] total 63 [2023-12-02 08:39:45,240 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1922149295] [2023-12-02 08:39:45,240 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 08:39:45,240 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 64 states [2023-12-02 08:39:45,240 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 08:39:45,241 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 64 interpolants. [2023-12-02 08:39:45,241 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=498, Invalid=5200, Unknown=2, NotChecked=0, Total=5700 [2023-12-02 08:39:45,241 INFO L87 Difference]: Start difference. First operand 4524 states and 5418 transitions. Second operand has 64 states, 63 states have (on average 2.6507936507936507) internal successors, (167), 64 states have internal predecessors, (167), 0 states have call successors, (0), 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 08:39:47,838 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 08:39:47,839 INFO L93 Difference]: Finished difference Result 5093 states and 6005 transitions. [2023-12-02 08:39:47,839 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2023-12-02 08:39:47,839 INFO L78 Accepts]: Start accepts. Automaton has has 64 states, 63 states have (on average 2.6507936507936507) internal successors, (167), 64 states have internal predecessors, (167), 0 states have call successors, (0), 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 81 [2023-12-02 08:39:47,839 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 08:39:47,842 INFO L225 Difference]: With dead ends: 5093 [2023-12-02 08:39:47,842 INFO L226 Difference]: Without dead ends: 5093 [2023-12-02 08:39:47,842 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 301 GetRequests, 184 SyntacticMatches, 13 SemanticMatches, 104 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4040 ImplicationChecksByTransitivity, 5.5s TimeCoverageRelationStatistics Valid=1035, Invalid=10093, Unknown=2, NotChecked=0, Total=11130 [2023-12-02 08:39:47,842 INFO L413 NwaCegarLoop]: 56 mSDtfsCounter, 513 mSDsluCounter, 1192 mSDsCounter, 0 mSdLazyCounter, 2126 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 513 SdHoareTripleChecker+Valid, 1248 SdHoareTripleChecker+Invalid, 2127 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 2126 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2023-12-02 08:39:47,843 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [513 Valid, 1248 Invalid, 2127 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 2126 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time] [2023-12-02 08:39:47,845 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5093 states. [2023-12-02 08:39:47,882 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5093 to 4604. [2023-12-02 08:39:47,884 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 4604 states, 4602 states have (on average 1.1988265971316818) internal successors, (5517), 4603 states have internal predecessors, (5517), 0 states have call successors, (0), 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 08:39:47,889 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4604 states to 4604 states and 5517 transitions. [2023-12-02 08:39:47,889 INFO L78 Accepts]: Start accepts. Automaton has 4604 states and 5517 transitions. Word has length 81 [2023-12-02 08:39:47,889 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 08:39:47,889 INFO L495 AbstractCegarLoop]: Abstraction has 4604 states and 5517 transitions. [2023-12-02 08:39:47,889 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 64 states, 63 states have (on average 2.6507936507936507) internal successors, (167), 64 states have internal predecessors, (167), 0 states have call successors, (0), 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 08:39:47,889 INFO L276 IsEmpty]: Start isEmpty. Operand 4604 states and 5517 transitions. [2023-12-02 08:39:47,892 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2023-12-02 08:39:47,892 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 08:39:47,892 INFO L195 NwaCegarLoop]: trace histogram [14, 13, 13, 13, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 08:39:47,897 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (44)] Ended with exit code 0 [2023-12-02 08:39:48,093 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 44 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable55 [2023-12-02 08:39:48,093 INFO L420 AbstractCegarLoop]: === Iteration 57 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 10 more)] === [2023-12-02 08:39:48,093 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 08:39:48,093 INFO L85 PathProgramCache]: Analyzing trace with hash -1379207366, now seen corresponding path program 23 times [2023-12-02 08:39:48,093 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 08:39:48,093 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [9613374] [2023-12-02 08:39:48,093 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 08:39:48,093 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 08:39:48,119 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 08:39:49,237 INFO L134 CoverageAnalysis]: Checked inductivity of 482 backedges. 38 proven. 444 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 08:39:49,238 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 08:39:49,238 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [9613374] [2023-12-02 08:39:49,238 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [9613374] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 08:39:49,238 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [956000694] [2023-12-02 08:39:49,238 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-12-02 08:39:49,238 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 08:39:49,238 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 08:39:49,239 INFO L229 MonitoredProcess]: Starting monitored process 45 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 08:39:49,240 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (45)] Waiting until timeout for monitored process [2023-12-02 08:39:49,810 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 14 check-sat command(s) [2023-12-02 08:39:49,810 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 08:39:49,816 INFO L262 TraceCheckSpWp]: Trace formula consists of 501 conjuncts, 150 conjunts are in the unsatisfiable core [2023-12-02 08:39:49,818 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 08:39:50,200 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2023-12-02 08:39:50,365 INFO L134 CoverageAnalysis]: Checked inductivity of 482 backedges. 38 proven. 444 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 08:39:50,365 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 08:39:50,450 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 13 [2023-12-02 08:39:50,452 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2023-12-02 08:39:50,564 INFO L134 CoverageAnalysis]: Checked inductivity of 482 backedges. 38 proven. 444 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 08:39:50,564 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [956000694] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 08:39:50,564 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1065888896] [2023-12-02 08:39:50,565 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2023-12-02 08:39:50,565 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 08:39:50,565 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 08:39:50,565 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 08:39:50,565 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 08:39:51,186 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 08:39:53,223 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '158805#(and (<= 2 |ULTIMATE.start_cstrspn_~s2#1.base|) (= |ULTIMATE.start_cstrspn_#in~s2#1.offset| 0) (<= 2 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |ULTIMATE.start_main_#t~malloc8#1.offset| 0) (<= 0 |ULTIMATE.start_cstrspn_#t~post4#1.offset|) (<= 1 |#StackHeapBarrier|) (= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (= |ULTIMATE.start_main_~length1~0#1| 1) (= |ULTIMATE.start_cstrspn_~p~0#1.offset| 1) (= |ULTIMATE.start_cstrspn_~spanp~0#1.base| |ULTIMATE.start_cstrspn_#t~post4#1.base|) (<= 2 |ULTIMATE.start_main_#t~malloc9#1.base|) (<= 2 |ULTIMATE.start_cstrspn_#in~s1#1.base|) (= |ULTIMATE.start_cstrspn_#in~s1#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc9#1.offset| 0) (= 0 |ULTIMATE.start_cstrspn_~s2#1.offset|) (= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 2 |ULTIMATE.start_cstrspn_~p~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 2 |ULTIMATE.start_main_#t~malloc8#1.base|) (<= 2 |ULTIMATE.start_cstrspn_#in~s2#1.base|) (<= (select |#length| |ULTIMATE.start_cstrspn_#t~post4#1.base|) |ULTIMATE.start_cstrspn_#t~post4#1.offset|) (<= 2 |ULTIMATE.start_cstrspn_~s1#1.base|) (<= 2 |ULTIMATE.start_main_~nondetString1~0#1.base|) (= |ULTIMATE.start_cstrspn_~s1#1.offset| 0) (= (+ |ULTIMATE.start_cstrspn_#t~post4#1.offset| 1) |ULTIMATE.start_cstrspn_~spanp~0#1.offset|) (<= 2 |ULTIMATE.start_cstrspn_#t~post4#1.base|))' at error location [2023-12-02 08:39:53,223 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 08:39:53,224 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 08:39:53,224 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 33, 33] total 54 [2023-12-02 08:39:53,224 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [286020733] [2023-12-02 08:39:53,224 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 08:39:53,224 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 54 states [2023-12-02 08:39:53,224 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 08:39:53,225 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 54 interpolants. [2023-12-02 08:39:53,225 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=207, Invalid=4083, Unknown=0, NotChecked=0, Total=4290 [2023-12-02 08:39:53,225 INFO L87 Difference]: Start difference. First operand 4604 states and 5517 transitions. Second operand has 54 states, 54 states have (on average 2.240740740740741) internal successors, (121), 54 states have internal predecessors, (121), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 08:39:55,769 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 08:39:55,769 INFO L93 Difference]: Finished difference Result 6162 states and 7293 transitions. [2023-12-02 08:39:55,769 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2023-12-02 08:39:55,770 INFO L78 Accepts]: Start accepts. Automaton has has 54 states, 54 states have (on average 2.240740740740741) internal successors, (121), 54 states have internal predecessors, (121), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 85 [2023-12-02 08:39:55,770 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 08:39:55,774 INFO L225 Difference]: With dead ends: 6162 [2023-12-02 08:39:55,774 INFO L226 Difference]: Without dead ends: 5442 [2023-12-02 08:39:55,774 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 317 GetRequests, 223 SyntacticMatches, 0 SemanticMatches, 94 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1738 ImplicationChecksByTransitivity, 4.1s TimeCoverageRelationStatistics Valid=510, Invalid=8610, Unknown=0, NotChecked=0, Total=9120 [2023-12-02 08:39:55,775 INFO L413 NwaCegarLoop]: 71 mSDtfsCounter, 288 mSDsluCounter, 2490 mSDsCounter, 0 mSdLazyCounter, 3356 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 288 SdHoareTripleChecker+Valid, 2561 SdHoareTripleChecker+Invalid, 3368 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 3356 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.4s IncrementalHoareTripleChecker+Time [2023-12-02 08:39:55,775 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [288 Valid, 2561 Invalid, 3368 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 3356 Invalid, 0 Unknown, 0 Unchecked, 1.4s Time] [2023-12-02 08:39:55,777 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5442 states. [2023-12-02 08:39:55,810 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5442 to 5178. [2023-12-02 08:39:55,813 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5178 states, 5176 states have (on average 1.2005409582689335) internal successors, (6214), 5177 states have internal predecessors, (6214), 0 states have call successors, (0), 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 08:39:55,818 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5178 states to 5178 states and 6214 transitions. [2023-12-02 08:39:55,818 INFO L78 Accepts]: Start accepts. Automaton has 5178 states and 6214 transitions. Word has length 85 [2023-12-02 08:39:55,818 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 08:39:55,818 INFO L495 AbstractCegarLoop]: Abstraction has 5178 states and 6214 transitions. [2023-12-02 08:39:55,819 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 54 states, 54 states have (on average 2.240740740740741) internal successors, (121), 54 states have internal predecessors, (121), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 08:39:55,819 INFO L276 IsEmpty]: Start isEmpty. Operand 5178 states and 6214 transitions. [2023-12-02 08:39:55,822 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 88 [2023-12-02 08:39:55,822 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 08:39:55,822 INFO L195 NwaCegarLoop]: trace histogram [14, 13, 13, 13, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 08:39:55,828 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (45)] Ended with exit code 0 [2023-12-02 08:39:56,022 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 45 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable56 [2023-12-02 08:39:56,022 INFO L420 AbstractCegarLoop]: === Iteration 58 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 10 more)] === [2023-12-02 08:39:56,022 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 08:39:56,023 INFO L85 PathProgramCache]: Analyzing trace with hash 1165311231, now seen corresponding path program 24 times [2023-12-02 08:39:56,023 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 08:39:56,023 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1518700572] [2023-12-02 08:39:56,023 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 08:39:56,023 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 08:39:56,044 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 08:39:57,152 INFO L134 CoverageAnalysis]: Checked inductivity of 507 backedges. 121 proven. 386 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 08:39:57,152 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 08:39:57,152 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1518700572] [2023-12-02 08:39:57,152 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1518700572] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 08:39:57,153 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [451325323] [2023-12-02 08:39:57,153 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-12-02 08:39:57,153 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 08:39:57,153 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 08:39:57,154 INFO L229 MonitoredProcess]: Starting monitored process 46 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 08:39:57,156 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (46)] Waiting until timeout for monitored process [2023-12-02 08:39:57,483 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-12-02 08:39:57,483 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 08:39:57,488 INFO L262 TraceCheckSpWp]: Trace formula consists of 514 conjuncts, 141 conjunts are in the unsatisfiable core [2023-12-02 08:39:57,490 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 08:39:57,496 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 1 [2023-12-02 08:39:58,167 INFO L134 CoverageAnalysis]: Checked inductivity of 507 backedges. 144 proven. 363 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 08:39:58,168 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 08:39:59,809 INFO L134 CoverageAnalysis]: Checked inductivity of 507 backedges. 144 proven. 363 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 08:39:59,809 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [451325323] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 08:39:59,809 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1124033111] [2023-12-02 08:39:59,810 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2023-12-02 08:39:59,810 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 08:39:59,810 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 08:39:59,810 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 08:39:59,810 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 08:40:00,419 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 08:40:02,686 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '170815#(and (<= 2 |ULTIMATE.start_cstrspn_~s2#1.base|) (= |ULTIMATE.start_cstrspn_#in~s2#1.offset| 0) (<= 2 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |ULTIMATE.start_main_#t~malloc8#1.offset| 0) (<= 0 |ULTIMATE.start_cstrspn_#t~post4#1.offset|) (<= 1 |#StackHeapBarrier|) (= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (= |ULTIMATE.start_main_~length1~0#1| 1) (= |ULTIMATE.start_cstrspn_~p~0#1.offset| 1) (= |ULTIMATE.start_cstrspn_~spanp~0#1.base| |ULTIMATE.start_cstrspn_#t~post4#1.base|) (<= 2 |ULTIMATE.start_main_#t~malloc9#1.base|) (<= 2 |ULTIMATE.start_cstrspn_#in~s1#1.base|) (= |ULTIMATE.start_cstrspn_#in~s1#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc9#1.offset| 0) (= 0 |ULTIMATE.start_cstrspn_~s2#1.offset|) (= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 2 |ULTIMATE.start_cstrspn_~p~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 2 |ULTIMATE.start_main_#t~malloc8#1.base|) (<= 2 |ULTIMATE.start_cstrspn_#in~s2#1.base|) (<= (select |#length| |ULTIMATE.start_cstrspn_#t~post4#1.base|) |ULTIMATE.start_cstrspn_#t~post4#1.offset|) (<= 2 |ULTIMATE.start_cstrspn_~s1#1.base|) (<= 2 |ULTIMATE.start_main_~nondetString1~0#1.base|) (= |ULTIMATE.start_cstrspn_~s1#1.offset| 0) (= (+ |ULTIMATE.start_cstrspn_#t~post4#1.offset| 1) |ULTIMATE.start_cstrspn_~spanp~0#1.offset|) (<= 2 |ULTIMATE.start_cstrspn_#t~post4#1.base|))' at error location [2023-12-02 08:40:02,686 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 08:40:02,686 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 08:40:02,686 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 31, 31] total 80 [2023-12-02 08:40:02,686 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1077592988] [2023-12-02 08:40:02,686 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 08:40:02,687 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 82 states [2023-12-02 08:40:02,687 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 08:40:02,688 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 82 interpolants. [2023-12-02 08:40:02,688 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=952, Invalid=7788, Unknown=2, NotChecked=0, Total=8742 [2023-12-02 08:40:02,688 INFO L87 Difference]: Start difference. First operand 5178 states and 6214 transitions. Second operand has 82 states, 81 states have (on average 2.580246913580247) internal successors, (209), 81 states have internal predecessors, (209), 0 states have call successors, (0), 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 08:40:05,452 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 08:40:05,452 INFO L93 Difference]: Finished difference Result 5786 states and 6840 transitions. [2023-12-02 08:40:05,452 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2023-12-02 08:40:05,452 INFO L78 Accepts]: Start accepts. Automaton has has 82 states, 81 states have (on average 2.580246913580247) internal successors, (209), 81 states have internal predecessors, (209), 0 states have call successors, (0), 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 87 [2023-12-02 08:40:05,452 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 08:40:05,456 INFO L225 Difference]: With dead ends: 5786 [2023-12-02 08:40:05,456 INFO L226 Difference]: Without dead ends: 5786 [2023-12-02 08:40:05,456 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 323 GetRequests, 199 SyntacticMatches, 0 SemanticMatches, 124 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5012 ImplicationChecksByTransitivity, 5.9s TimeCoverageRelationStatistics Valid=2037, Invalid=13711, Unknown=2, NotChecked=0, Total=15750 [2023-12-02 08:40:05,457 INFO L413 NwaCegarLoop]: 63 mSDtfsCounter, 611 mSDsluCounter, 1415 mSDsCounter, 0 mSdLazyCounter, 2670 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 611 SdHoareTripleChecker+Valid, 1478 SdHoareTripleChecker+Invalid, 2673 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 2670 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.2s IncrementalHoareTripleChecker+Time [2023-12-02 08:40:05,457 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [611 Valid, 1478 Invalid, 2673 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 2670 Invalid, 0 Unknown, 0 Unchecked, 1.2s Time] [2023-12-02 08:40:05,459 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5786 states. [2023-12-02 08:40:05,496 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5786 to 5258. [2023-12-02 08:40:05,499 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5258 states, 5256 states have (on average 1.2011035007610351) internal successors, (6313), 5257 states have internal predecessors, (6313), 0 states have call successors, (0), 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 08:40:05,504 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5258 states to 5258 states and 6313 transitions. [2023-12-02 08:40:05,504 INFO L78 Accepts]: Start accepts. Automaton has 5258 states and 6313 transitions. Word has length 87 [2023-12-02 08:40:05,504 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 08:40:05,504 INFO L495 AbstractCegarLoop]: Abstraction has 5258 states and 6313 transitions. [2023-12-02 08:40:05,504 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 82 states, 81 states have (on average 2.580246913580247) internal successors, (209), 81 states have internal predecessors, (209), 0 states have call successors, (0), 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 08:40:05,505 INFO L276 IsEmpty]: Start isEmpty. Operand 5258 states and 6313 transitions. [2023-12-02 08:40:05,508 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 92 [2023-12-02 08:40:05,508 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 08:40:05,508 INFO L195 NwaCegarLoop]: trace histogram [15, 14, 14, 14, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 08:40:05,514 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (46)] Ended with exit code 0 [2023-12-02 08:40:05,708 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 46 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable57 [2023-12-02 08:40:05,709 INFO L420 AbstractCegarLoop]: === Iteration 59 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 10 more)] === [2023-12-02 08:40:05,709 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 08:40:05,709 INFO L85 PathProgramCache]: Analyzing trace with hash -533760893, now seen corresponding path program 25 times [2023-12-02 08:40:05,709 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 08:40:05,709 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1155342548] [2023-12-02 08:40:05,709 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 08:40:05,709 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 08:40:05,734 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 08:40:06,891 INFO L134 CoverageAnalysis]: Checked inductivity of 561 backedges. 41 proven. 520 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 08:40:06,891 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 08:40:06,891 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1155342548] [2023-12-02 08:40:06,891 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1155342548] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 08:40:06,891 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [171889605] [2023-12-02 08:40:06,891 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-12-02 08:40:06,891 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 08:40:06,891 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 08:40:06,892 INFO L229 MonitoredProcess]: Starting monitored process 47 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 08:40:06,893 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (47)] Waiting until timeout for monitored process [2023-12-02 08:40:07,074 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 08:40:07,078 INFO L262 TraceCheckSpWp]: Trace formula consists of 532 conjuncts, 160 conjunts are in the unsatisfiable core [2023-12-02 08:40:07,082 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 08:40:07,530 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2023-12-02 08:40:07,670 INFO L134 CoverageAnalysis]: Checked inductivity of 561 backedges. 41 proven. 520 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 08:40:07,670 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 08:40:07,744 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 13 [2023-12-02 08:40:07,745 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2023-12-02 08:40:07,848 INFO L134 CoverageAnalysis]: Checked inductivity of 561 backedges. 41 proven. 520 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 08:40:07,848 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [171889605] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 08:40:07,848 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1255045721] [2023-12-02 08:40:07,849 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2023-12-02 08:40:07,849 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 08:40:07,849 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 08:40:07,849 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 08:40:07,849 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 08:40:08,468 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 08:40:10,746 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '182532#(and (<= 2 |ULTIMATE.start_cstrspn_~s2#1.base|) (= |ULTIMATE.start_cstrspn_#in~s2#1.offset| 0) (<= 2 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |ULTIMATE.start_main_#t~malloc8#1.offset| 0) (<= 0 |ULTIMATE.start_cstrspn_#t~post4#1.offset|) (<= 1 |#StackHeapBarrier|) (= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (= |ULTIMATE.start_main_~length1~0#1| 1) (= |ULTIMATE.start_cstrspn_~p~0#1.offset| 1) (= |ULTIMATE.start_cstrspn_~spanp~0#1.base| |ULTIMATE.start_cstrspn_#t~post4#1.base|) (<= 2 |ULTIMATE.start_main_#t~malloc9#1.base|) (<= 2 |ULTIMATE.start_cstrspn_#in~s1#1.base|) (= |ULTIMATE.start_cstrspn_#in~s1#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc9#1.offset| 0) (= 0 |ULTIMATE.start_cstrspn_~s2#1.offset|) (= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 2 |ULTIMATE.start_cstrspn_~p~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 2 |ULTIMATE.start_main_#t~malloc8#1.base|) (<= 2 |ULTIMATE.start_cstrspn_#in~s2#1.base|) (<= (select |#length| |ULTIMATE.start_cstrspn_#t~post4#1.base|) |ULTIMATE.start_cstrspn_#t~post4#1.offset|) (<= 2 |ULTIMATE.start_cstrspn_~s1#1.base|) (<= 2 |ULTIMATE.start_main_~nondetString1~0#1.base|) (= |ULTIMATE.start_cstrspn_~s1#1.offset| 0) (= (+ |ULTIMATE.start_cstrspn_#t~post4#1.offset| 1) |ULTIMATE.start_cstrspn_~spanp~0#1.offset|) (<= 2 |ULTIMATE.start_cstrspn_#t~post4#1.base|))' at error location [2023-12-02 08:40:10,746 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 08:40:10,746 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 08:40:10,747 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36, 35, 35] total 57 [2023-12-02 08:40:10,747 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1961245887] [2023-12-02 08:40:10,747 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 08:40:10,747 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 57 states [2023-12-02 08:40:10,747 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 08:40:10,748 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 57 interpolants. [2023-12-02 08:40:10,748 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=213, Invalid=4476, Unknown=3, NotChecked=0, Total=4692 [2023-12-02 08:40:10,748 INFO L87 Difference]: Start difference. First operand 5258 states and 6313 transitions. Second operand has 57 states, 57 states have (on average 2.263157894736842) internal successors, (129), 57 states have internal predecessors, (129), 0 states have call successors, (0), 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 08:40:13,360 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 08:40:13,360 INFO L93 Difference]: Finished difference Result 6935 states and 8227 transitions. [2023-12-02 08:40:13,361 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2023-12-02 08:40:13,361 INFO L78 Accepts]: Start accepts. Automaton has has 57 states, 57 states have (on average 2.263157894736842) internal successors, (129), 57 states have internal predecessors, (129), 0 states have call successors, (0), 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 91 [2023-12-02 08:40:13,361 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 08:40:13,365 INFO L225 Difference]: With dead ends: 6935 [2023-12-02 08:40:13,366 INFO L226 Difference]: Without dead ends: 6163 [2023-12-02 08:40:13,366 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 339 GetRequests, 240 SyntacticMatches, 0 SemanticMatches, 99 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1910 ImplicationChecksByTransitivity, 4.4s TimeCoverageRelationStatistics Valid=535, Invalid=9562, Unknown=3, NotChecked=0, Total=10100 [2023-12-02 08:40:13,367 INFO L413 NwaCegarLoop]: 76 mSDtfsCounter, 396 mSDsluCounter, 2732 mSDsCounter, 0 mSdLazyCounter, 3554 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 396 SdHoareTripleChecker+Valid, 2808 SdHoareTripleChecker+Invalid, 3567 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 3554 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.4s IncrementalHoareTripleChecker+Time [2023-12-02 08:40:13,367 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [396 Valid, 2808 Invalid, 3567 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 3554 Invalid, 0 Unknown, 0 Unchecked, 1.4s Time] [2023-12-02 08:40:13,371 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 6163 states. [2023-12-02 08:40:13,408 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 6163 to 5876. [2023-12-02 08:40:13,412 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5876 states, 5874 states have (on average 1.2027579162410622) internal successors, (7065), 5875 states have internal predecessors, (7065), 0 states have call successors, (0), 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 08:40:13,418 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5876 states to 5876 states and 7065 transitions. [2023-12-02 08:40:13,419 INFO L78 Accepts]: Start accepts. Automaton has 5876 states and 7065 transitions. Word has length 91 [2023-12-02 08:40:13,419 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 08:40:13,419 INFO L495 AbstractCegarLoop]: Abstraction has 5876 states and 7065 transitions. [2023-12-02 08:40:13,419 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 57 states, 57 states have (on average 2.263157894736842) internal successors, (129), 57 states have internal predecessors, (129), 0 states have call successors, (0), 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 08:40:13,419 INFO L276 IsEmpty]: Start isEmpty. Operand 5876 states and 7065 transitions. [2023-12-02 08:40:13,424 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 94 [2023-12-02 08:40:13,424 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 08:40:13,425 INFO L195 NwaCegarLoop]: trace histogram [12, 11, 11, 11, 11, 11, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 08:40:13,430 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (47)] Forceful destruction successful, exit code 0 [2023-12-02 08:40:13,625 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 47 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable58 [2023-12-02 08:40:13,625 INFO L420 AbstractCegarLoop]: === Iteration 60 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 10 more)] === [2023-12-02 08:40:13,625 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 08:40:13,625 INFO L85 PathProgramCache]: Analyzing trace with hash -737818389, now seen corresponding path program 18 times [2023-12-02 08:40:13,626 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 08:40:13,626 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [289313649] [2023-12-02 08:40:13,626 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 08:40:13,626 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 08:40:13,654 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 08:40:15,304 INFO L134 CoverageAnalysis]: Checked inductivity of 434 backedges. 0 proven. 433 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 08:40:15,304 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 08:40:15,304 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [289313649] [2023-12-02 08:40:15,304 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [289313649] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 08:40:15,304 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [244118246] [2023-12-02 08:40:15,304 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-12-02 08:40:15,305 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 08:40:15,305 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 08:40:15,305 INFO L229 MonitoredProcess]: Starting monitored process 48 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 08:40:15,306 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (48)] Waiting until timeout for monitored process [2023-12-02 08:40:15,617 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-12-02 08:40:15,617 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 08:40:15,623 INFO L262 TraceCheckSpWp]: Trace formula consists of 630 conjuncts, 163 conjunts are in the unsatisfiable core [2023-12-02 08:40:15,626 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 08:40:15,631 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2023-12-02 08:40:16,230 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 13 treesize of output 9 [2023-12-02 08:40:16,294 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 18 treesize of output 13 [2023-12-02 08:40:18,116 INFO L349 Elim1Store]: treesize reduction 18, result has 33.3 percent of original size [2023-12-02 08:40:18,117 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 36 treesize of output 23 [2023-12-02 08:40:18,183 INFO L134 CoverageAnalysis]: Checked inductivity of 434 backedges. 80 proven. 351 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2023-12-02 08:40:18,183 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 08:40:20,021 WARN L854 $PredicateComparison]: unable to prove that (forall ((v_ArrVal_2083 (Array Int Int)) (|ULTIMATE.start_main_~nondetString2~0#1.offset| Int) (|ULTIMATE.start_cstrspn_~s2#1.base| Int)) (let ((.cse2 (store |c_#memory_int| |c_ULTIMATE.start_main_~nondetString2~0#1.base| v_ArrVal_2083))) (let ((.cse1 (select .cse2 |c_ULTIMATE.start_main_~nondetString1~0#1.base|)) (.cse0 (select (select .cse2 |ULTIMATE.start_cstrspn_~s2#1.base|) |ULTIMATE.start_main_~nondetString2~0#1.offset|))) (or (not (= .cse0 (select .cse1 (+ 9 |c_ULTIMATE.start_main_~nondetString1~0#1.offset|)))) (not (= .cse0 (select .cse1 |c_ULTIMATE.start_main_~nondetString1~0#1.offset|))) (= .cse0 0))))) is different from false [2023-12-02 08:40:20,028 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-12-02 08:40:20,029 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 104 treesize of output 60 [2023-12-02 08:40:20,058 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-12-02 08:40:20,058 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 4 new quantified variables, introduced 6 case distinctions, treesize of input 181 treesize of output 189 [2023-12-02 08:40:20,080 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-12-02 08:40:20,080 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 122 treesize of output 118 [2023-12-02 08:40:21,576 INFO L134 CoverageAnalysis]: Checked inductivity of 434 backedges. 84 proven. 347 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2023-12-02 08:40:21,576 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [244118246] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 08:40:21,576 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1025531598] [2023-12-02 08:40:21,577 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2023-12-02 08:40:21,577 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 08:40:21,577 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 08:40:21,577 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 08:40:21,577 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 08:40:22,506 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 08:40:24,568 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '196065#(or (< (select |#length| |ULTIMATE.start_cstrspn_#t~post2#1.base|) (+ |ULTIMATE.start_cstrspn_#t~post2#1.offset| 1)) (< |ULTIMATE.start_cstrspn_#t~post2#1.offset| 0))' at error location [2023-12-02 08:40:24,568 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 08:40:24,568 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 08:40:24,568 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 33, 33] total 93 [2023-12-02 08:40:24,568 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1617023502] [2023-12-02 08:40:24,568 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 08:40:24,568 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 94 states [2023-12-02 08:40:24,568 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 08:40:24,569 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 94 interpolants. [2023-12-02 08:40:24,570 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=289, Invalid=10426, Unknown=1, NotChecked=204, Total=10920 [2023-12-02 08:40:24,570 INFO L87 Difference]: Start difference. First operand 5876 states and 7065 transitions. Second operand has 94 states, 94 states have (on average 2.872340425531915) internal successors, (270), 93 states have internal predecessors, (270), 0 states have call successors, (0), 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 08:40:49,464 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 08:40:49,465 INFO L93 Difference]: Finished difference Result 20916 states and 25219 transitions. [2023-12-02 08:40:49,465 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 142 states. [2023-12-02 08:40:49,465 INFO L78 Accepts]: Start accepts. Automaton has has 94 states, 94 states have (on average 2.872340425531915) internal successors, (270), 93 states have internal predecessors, (270), 0 states have call successors, (0), 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 93 [2023-12-02 08:40:49,465 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 08:40:49,477 INFO L225 Difference]: With dead ends: 20916 [2023-12-02 08:40:49,478 INFO L226 Difference]: Without dead ends: 20854 [2023-12-02 08:40:49,480 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 443 GetRequests, 202 SyntacticMatches, 1 SemanticMatches, 240 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 11335 ImplicationChecksByTransitivity, 27.5s TimeCoverageRelationStatistics Valid=2557, Invalid=55267, Unknown=20, NotChecked=478, Total=58322 [2023-12-02 08:40:49,480 INFO L413 NwaCegarLoop]: 51 mSDtfsCounter, 1346 mSDsluCounter, 3215 mSDsCounter, 0 mSdLazyCounter, 8168 mSolverCounterSat, 30 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1346 SdHoareTripleChecker+Valid, 3266 SdHoareTripleChecker+Invalid, 8673 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 30 IncrementalHoareTripleChecker+Valid, 8168 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 474 IncrementalHoareTripleChecker+Unchecked, 4.8s IncrementalHoareTripleChecker+Time [2023-12-02 08:40:49,480 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1346 Valid, 3266 Invalid, 8673 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [30 Valid, 8168 Invalid, 1 Unknown, 474 Unchecked, 4.8s Time] [2023-12-02 08:40:49,489 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20854 states. [2023-12-02 08:40:49,635 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20854 to 17367. [2023-12-02 08:40:49,645 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 17367 states, 17365 states have (on average 1.209847394183703) internal successors, (21009), 17366 states have internal predecessors, (21009), 0 states have call successors, (0), 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 08:40:49,665 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17367 states to 17367 states and 21009 transitions. [2023-12-02 08:40:49,665 INFO L78 Accepts]: Start accepts. Automaton has 17367 states and 21009 transitions. Word has length 93 [2023-12-02 08:40:49,665 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 08:40:49,665 INFO L495 AbstractCegarLoop]: Abstraction has 17367 states and 21009 transitions. [2023-12-02 08:40:49,665 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 94 states, 94 states have (on average 2.872340425531915) internal successors, (270), 93 states have internal predecessors, (270), 0 states have call successors, (0), 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 08:40:49,665 INFO L276 IsEmpty]: Start isEmpty. Operand 17367 states and 21009 transitions. [2023-12-02 08:40:49,674 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 94 [2023-12-02 08:40:49,675 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 08:40:49,675 INFO L195 NwaCegarLoop]: trace histogram [15, 14, 14, 14, 14, 14, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 08:40:49,681 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (48)] Ended with exit code 0 [2023-12-02 08:40:49,875 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable59,48 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 08:40:49,875 INFO L420 AbstractCegarLoop]: === Iteration 61 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 10 more)] === [2023-12-02 08:40:49,875 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 08:40:49,876 INFO L85 PathProgramCache]: Analyzing trace with hash 1400738440, now seen corresponding path program 26 times [2023-12-02 08:40:49,876 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 08:40:49,876 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1134502622] [2023-12-02 08:40:49,876 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 08:40:49,876 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 08:40:49,898 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 08:40:51,409 INFO L134 CoverageAnalysis]: Checked inductivity of 588 backedges. 144 proven. 444 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 08:40:51,409 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 08:40:51,409 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1134502622] [2023-12-02 08:40:51,410 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1134502622] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 08:40:51,410 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [214198161] [2023-12-02 08:40:51,410 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-12-02 08:40:51,410 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 08:40:51,410 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 08:40:51,411 INFO L229 MonitoredProcess]: Starting monitored process 49 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 08:40:51,411 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (49)] Waiting until timeout for monitored process [2023-12-02 08:40:51,983 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 15 check-sat command(s) [2023-12-02 08:40:51,983 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 08:40:51,989 INFO L262 TraceCheckSpWp]: Trace formula consists of 545 conjuncts, 118 conjunts are in the unsatisfiable core [2023-12-02 08:40:51,992 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 08:40:53,247 INFO L134 CoverageAnalysis]: Checked inductivity of 588 backedges. 169 proven. 419 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 08:40:53,248 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 08:40:54,450 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 7 treesize of output 5 [2023-12-02 08:40:54,884 INFO L134 CoverageAnalysis]: Checked inductivity of 588 backedges. 169 proven. 419 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 08:40:54,884 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [214198161] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 08:40:54,884 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [81561151] [2023-12-02 08:40:54,885 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2023-12-02 08:40:54,885 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 08:40:54,885 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 08:40:54,885 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 08:40:54,885 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 08:40:55,481 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 08:40:57,788 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '235273#(and (<= 2 |ULTIMATE.start_cstrspn_~s2#1.base|) (= |ULTIMATE.start_cstrspn_#in~s2#1.offset| 0) (<= 2 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |ULTIMATE.start_main_#t~malloc8#1.offset| 0) (<= 0 |ULTIMATE.start_cstrspn_#t~post4#1.offset|) (<= 1 |#StackHeapBarrier|) (= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (= |ULTIMATE.start_main_~length1~0#1| 1) (= |ULTIMATE.start_cstrspn_~p~0#1.offset| 1) (= |ULTIMATE.start_cstrspn_~spanp~0#1.base| |ULTIMATE.start_cstrspn_#t~post4#1.base|) (<= 2 |ULTIMATE.start_main_#t~malloc9#1.base|) (<= 2 |ULTIMATE.start_cstrspn_#in~s1#1.base|) (= |ULTIMATE.start_cstrspn_#in~s1#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc9#1.offset| 0) (= 0 |ULTIMATE.start_cstrspn_~s2#1.offset|) (= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 2 |ULTIMATE.start_cstrspn_~p~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 2 |ULTIMATE.start_main_#t~malloc8#1.base|) (<= 2 |ULTIMATE.start_cstrspn_#in~s2#1.base|) (<= (select |#length| |ULTIMATE.start_cstrspn_#t~post4#1.base|) |ULTIMATE.start_cstrspn_#t~post4#1.offset|) (<= 2 |ULTIMATE.start_cstrspn_~s1#1.base|) (<= 2 |ULTIMATE.start_main_~nondetString1~0#1.base|) (= |ULTIMATE.start_cstrspn_~s1#1.offset| 0) (= (+ |ULTIMATE.start_cstrspn_#t~post4#1.offset| 1) |ULTIMATE.start_cstrspn_~spanp~0#1.offset|) (<= 2 |ULTIMATE.start_cstrspn_#t~post4#1.base|))' at error location [2023-12-02 08:40:57,788 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 08:40:57,788 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 08:40:57,788 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 34, 34] total 86 [2023-12-02 08:40:57,788 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [450441489] [2023-12-02 08:40:57,788 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 08:40:57,789 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 87 states [2023-12-02 08:40:57,789 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 08:40:57,789 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 87 interpolants. [2023-12-02 08:40:57,790 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1089, Invalid=8613, Unknown=0, NotChecked=0, Total=9702 [2023-12-02 08:40:57,790 INFO L87 Difference]: Start difference. First operand 17367 states and 21009 transitions. Second operand has 87 states, 86 states have (on average 2.872093023255814) internal successors, (247), 87 states have internal predecessors, (247), 0 states have call successors, (0), 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 08:41:01,070 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 08:41:01,070 INFO L93 Difference]: Finished difference Result 18839 states and 22622 transitions. [2023-12-02 08:41:01,070 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 52 states. [2023-12-02 08:41:01,071 INFO L78 Accepts]: Start accepts. Automaton has has 87 states, 86 states have (on average 2.872093023255814) internal successors, (247), 87 states have internal predecessors, (247), 0 states have call successors, (0), 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 93 [2023-12-02 08:41:01,071 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 08:41:01,084 INFO L225 Difference]: With dead ends: 18839 [2023-12-02 08:41:01,084 INFO L226 Difference]: Without dead ends: 18839 [2023-12-02 08:41:01,085 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 345 GetRequests, 199 SyntacticMatches, 15 SemanticMatches, 131 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6834 ImplicationChecksByTransitivity, 7.5s TimeCoverageRelationStatistics Valid=2010, Invalid=15546, Unknown=0, NotChecked=0, Total=17556 [2023-12-02 08:41:01,085 INFO L413 NwaCegarLoop]: 64 mSDtfsCounter, 540 mSDsluCounter, 1096 mSDsCounter, 0 mSdLazyCounter, 2010 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 540 SdHoareTripleChecker+Valid, 1160 SdHoareTripleChecker+Invalid, 2011 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 2010 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.1s IncrementalHoareTripleChecker+Time [2023-12-02 08:41:01,085 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [540 Valid, 1160 Invalid, 2011 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 2010 Invalid, 0 Unknown, 0 Unchecked, 1.1s Time] [2023-12-02 08:41:01,095 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18839 states. [2023-12-02 08:41:01,250 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18839 to 17547. [2023-12-02 08:41:01,261 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 17547 states, 17545 states have (on average 1.210202336848105) internal successors, (21233), 17546 states have internal predecessors, (21233), 0 states have call successors, (0), 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 08:41:01,282 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17547 states to 17547 states and 21233 transitions. [2023-12-02 08:41:01,282 INFO L78 Accepts]: Start accepts. Automaton has 17547 states and 21233 transitions. Word has length 93 [2023-12-02 08:41:01,282 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 08:41:01,282 INFO L495 AbstractCegarLoop]: Abstraction has 17547 states and 21233 transitions. [2023-12-02 08:41:01,282 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 87 states, 86 states have (on average 2.872093023255814) internal successors, (247), 87 states have internal predecessors, (247), 0 states have call successors, (0), 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 08:41:01,282 INFO L276 IsEmpty]: Start isEmpty. Operand 17547 states and 21233 transitions. [2023-12-02 08:41:01,292 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 96 [2023-12-02 08:41:01,292 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 08:41:01,292 INFO L195 NwaCegarLoop]: trace histogram [12, 11, 11, 11, 11, 11, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 08:41:01,299 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (49)] Ended with exit code 0 [2023-12-02 08:41:01,493 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 49 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable60 [2023-12-02 08:41:01,493 INFO L420 AbstractCegarLoop]: === Iteration 62 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 10 more)] === [2023-12-02 08:41:01,493 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 08:41:01,493 INFO L85 PathProgramCache]: Analyzing trace with hash 1332421465, now seen corresponding path program 19 times [2023-12-02 08:41:01,493 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 08:41:01,493 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2092460694] [2023-12-02 08:41:01,493 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 08:41:01,494 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 08:41:01,525 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 08:41:02,933 INFO L134 CoverageAnalysis]: Checked inductivity of 453 backedges. 22 proven. 430 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 08:41:02,934 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 08:41:02,934 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2092460694] [2023-12-02 08:41:02,934 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2092460694] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 08:41:02,934 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [156306991] [2023-12-02 08:41:02,934 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-12-02 08:41:02,934 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 08:41:02,934 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 08:41:02,935 INFO L229 MonitoredProcess]: Starting monitored process 50 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 08:41:02,936 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (50)] Waiting until timeout for monitored process [2023-12-02 08:41:03,151 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 08:41:03,156 INFO L262 TraceCheckSpWp]: Trace formula consists of 643 conjuncts, 175 conjunts are in the unsatisfiable core [2023-12-02 08:41:03,159 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 08:41:03,166 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2023-12-02 08:41:03,823 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 13 treesize of output 9 [2023-12-02 08:41:03,874 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 18 treesize of output 13 [2023-12-02 08:41:05,734 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-12-02 08:41:05,734 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 3 new quantified variables, introduced 1 case distinctions, treesize of input 38 treesize of output 14 [2023-12-02 08:41:05,780 INFO L134 CoverageAnalysis]: Checked inductivity of 453 backedges. 22 proven. 430 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 08:41:05,780 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 08:41:06,349 WARN L854 $PredicateComparison]: unable to prove that (forall ((v_ArrVal_2218 (Array Int Int))) (let ((.cse2 (select (store |c_#memory_int| |c_ULTIMATE.start_main_~nondetString2~0#1.base| v_ArrVal_2218) |c_ULTIMATE.start_main_~nondetString1~0#1.base|))) (let ((.cse0 (select .cse2 |c_ULTIMATE.start_main_~nondetString1~0#1.offset|)) (.cse1 (select v_ArrVal_2218 |c_ULTIMATE.start_main_~nondetString2~0#1.offset|))) (or (= .cse0 0) (not (= .cse0 .cse1)) (not (= .cse1 (select .cse2 (+ 10 |c_ULTIMATE.start_main_~nondetString1~0#1.offset|)))))))) is different from false [2023-12-02 08:41:06,357 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-12-02 08:41:06,357 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 72 treesize of output 50 [2023-12-02 08:41:06,377 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-12-02 08:41:06,378 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 93 treesize of output 88 [2023-12-02 08:41:06,392 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-12-02 08:41:06,392 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 60 treesize of output 62 [2023-12-02 08:41:07,395 INFO L134 CoverageAnalysis]: Checked inductivity of 453 backedges. 28 proven. 424 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 08:41:07,395 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [156306991] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 08:41:07,395 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [55927340] [2023-12-02 08:41:07,396 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2023-12-02 08:41:07,396 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 08:41:07,396 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 08:41:07,396 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 08:41:07,397 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 08:41:08,299 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 08:41:09,948 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '272394#(or (< (select |#length| |ULTIMATE.start_cstrspn_#t~post2#1.base|) (+ |ULTIMATE.start_cstrspn_#t~post2#1.offset| 1)) (< |ULTIMATE.start_cstrspn_#t~post2#1.offset| 0))' at error location [2023-12-02 08:41:09,948 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 08:41:09,948 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 08:41:09,948 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 35, 35] total 90 [2023-12-02 08:41:09,948 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1712669117] [2023-12-02 08:41:09,948 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 08:41:09,949 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 91 states [2023-12-02 08:41:09,949 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 08:41:09,950 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 91 interpolants. [2023-12-02 08:41:09,950 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=334, Invalid=9769, Unknown=1, NotChecked=198, Total=10302 [2023-12-02 08:41:09,950 INFO L87 Difference]: Start difference. First operand 17547 states and 21233 transitions. Second operand has 91 states, 91 states have (on average 2.4835164835164836) internal successors, (226), 90 states have internal predecessors, (226), 0 states have call successors, (0), 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 08:41:18,286 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 08:41:18,286 INFO L93 Difference]: Finished difference Result 31070 states and 37630 transitions. [2023-12-02 08:41:18,286 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 109 states. [2023-12-02 08:41:18,287 INFO L78 Accepts]: Start accepts. Automaton has has 91 states, 91 states have (on average 2.4835164835164836) internal successors, (226), 90 states have internal predecessors, (226), 0 states have call successors, (0), 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 95 [2023-12-02 08:41:18,287 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 08:41:18,309 INFO L225 Difference]: With dead ends: 31070 [2023-12-02 08:41:18,309 INFO L226 Difference]: Without dead ends: 31002 [2023-12-02 08:41:18,311 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 411 GetRequests, 219 SyntacticMatches, 0 SemanticMatches, 192 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 9901 ImplicationChecksByTransitivity, 10.7s TimeCoverageRelationStatistics Valid=1902, Invalid=35157, Unknown=1, NotChecked=382, Total=37442 [2023-12-02 08:41:18,311 INFO L413 NwaCegarLoop]: 69 mSDtfsCounter, 982 mSDsluCounter, 3128 mSDsCounter, 0 mSdLazyCounter, 5490 mSolverCounterSat, 17 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 982 SdHoareTripleChecker+Valid, 3197 SdHoareTripleChecker+Invalid, 5832 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 17 IncrementalHoareTripleChecker+Valid, 5490 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 325 IncrementalHoareTripleChecker+Unchecked, 2.7s IncrementalHoareTripleChecker+Time [2023-12-02 08:41:18,311 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [982 Valid, 3197 Invalid, 5832 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [17 Valid, 5490 Invalid, 0 Unknown, 325 Unchecked, 2.7s Time] [2023-12-02 08:41:18,325 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31002 states. [2023-12-02 08:41:18,564 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31002 to 27242. [2023-12-02 08:41:18,581 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27242 states, 27240 states have (on average 1.21064610866373) internal successors, (32978), 27241 states have internal predecessors, (32978), 0 states have call successors, (0), 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 08:41:18,611 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27242 states to 27242 states and 32978 transitions. [2023-12-02 08:41:18,611 INFO L78 Accepts]: Start accepts. Automaton has 27242 states and 32978 transitions. Word has length 95 [2023-12-02 08:41:18,611 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 08:41:18,612 INFO L495 AbstractCegarLoop]: Abstraction has 27242 states and 32978 transitions. [2023-12-02 08:41:18,612 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 91 states, 91 states have (on average 2.4835164835164836) internal successors, (226), 90 states have internal predecessors, (226), 0 states have call successors, (0), 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 08:41:18,612 INFO L276 IsEmpty]: Start isEmpty. Operand 27242 states and 32978 transitions. [2023-12-02 08:41:18,655 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 98 [2023-12-02 08:41:18,655 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 08:41:18,656 INFO L195 NwaCegarLoop]: trace histogram [12, 11, 11, 11, 11, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 08:41:18,661 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (50)] Ended with exit code 0 [2023-12-02 08:41:18,856 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable61,50 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 08:41:18,856 INFO L420 AbstractCegarLoop]: === Iteration 63 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 10 more)] === [2023-12-02 08:41:18,857 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 08:41:18,857 INFO L85 PathProgramCache]: Analyzing trace with hash -2031904185, now seen corresponding path program 20 times [2023-12-02 08:41:18,857 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 08:41:18,857 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1831106628] [2023-12-02 08:41:18,857 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 08:41:18,857 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 08:41:18,884 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 08:41:19,776 INFO L134 CoverageAnalysis]: Checked inductivity of 474 backedges. 81 proven. 392 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 08:41:19,777 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 08:41:19,777 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1831106628] [2023-12-02 08:41:19,777 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1831106628] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 08:41:19,777 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1997073800] [2023-12-02 08:41:19,777 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-12-02 08:41:19,777 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 08:41:19,777 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 08:41:19,778 INFO L229 MonitoredProcess]: Starting monitored process 51 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 08:41:19,779 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (51)] Waiting until timeout for monitored process [2023-12-02 08:41:20,273 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 12 check-sat command(s) [2023-12-02 08:41:20,273 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 08:41:20,278 INFO L262 TraceCheckSpWp]: Trace formula consists of 656 conjuncts, 97 conjunts are in the unsatisfiable core [2023-12-02 08:41:20,280 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 08:41:20,796 INFO L134 CoverageAnalysis]: Checked inductivity of 474 backedges. 100 proven. 373 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 08:41:20,796 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 08:41:21,606 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 7 treesize of output 5 [2023-12-02 08:41:21,710 INFO L134 CoverageAnalysis]: Checked inductivity of 474 backedges. 100 proven. 373 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 08:41:21,710 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1997073800] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 08:41:21,710 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1831464427] [2023-12-02 08:41:21,711 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2023-12-02 08:41:21,711 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 08:41:21,711 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 08:41:21,712 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 08:41:21,712 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 08:41:22,831 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 08:41:24,756 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '331536#(and (= |ULTIMATE.start_cstrspn_#in~s2#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc8#1.offset| 0) (<= 0 |ULTIMATE.start_cstrspn_#t~post2#1.offset|) (= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (= |ULTIMATE.start_cstrspn_#in~s1#1.offset| 0) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (= |ULTIMATE.start_main_#t~malloc9#1.offset| 0) (= 0 |ULTIMATE.start_cstrspn_~s2#1.offset|) (= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 1 |ULTIMATE.start_cstrspn_~p~0#1.offset|) (= |ULTIMATE.start_cstrspn_~s1#1.offset| 0) (<= (select |#length| |ULTIMATE.start_cstrspn_#t~post2#1.base|) |ULTIMATE.start_cstrspn_#t~post2#1.offset|))' at error location [2023-12-02 08:41:24,756 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 08:41:24,756 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 08:41:24,756 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 27, 27] total 56 [2023-12-02 08:41:24,756 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [54189904] [2023-12-02 08:41:24,757 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 08:41:24,757 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 58 states [2023-12-02 08:41:24,757 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 08:41:24,758 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 58 interpolants. [2023-12-02 08:41:24,758 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=561, Invalid=4409, Unknown=0, NotChecked=0, Total=4970 [2023-12-02 08:41:24,758 INFO L87 Difference]: Start difference. First operand 27242 states and 32978 transitions. Second operand has 58 states, 57 states have (on average 4.175438596491228) internal successors, (238), 57 states have internal predecessors, (238), 0 states have call successors, (0), 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 08:41:26,300 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 08:41:26,300 INFO L93 Difference]: Finished difference Result 29001 states and 35100 transitions. [2023-12-02 08:41:26,300 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2023-12-02 08:41:26,300 INFO L78 Accepts]: Start accepts. Automaton has has 58 states, 57 states have (on average 4.175438596491228) internal successors, (238), 57 states have internal predecessors, (238), 0 states have call successors, (0), 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 97 [2023-12-02 08:41:26,300 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 08:41:26,323 INFO L225 Difference]: With dead ends: 29001 [2023-12-02 08:41:26,323 INFO L226 Difference]: Without dead ends: 29001 [2023-12-02 08:41:26,323 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 342 GetRequests, 235 SyntacticMatches, 12 SemanticMatches, 95 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2407 ImplicationChecksByTransitivity, 3.9s TimeCoverageRelationStatistics Valid=1096, Invalid=8216, Unknown=0, NotChecked=0, Total=9312 [2023-12-02 08:41:26,324 INFO L413 NwaCegarLoop]: 54 mSDtfsCounter, 386 mSDsluCounter, 777 mSDsCounter, 0 mSdLazyCounter, 1672 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 386 SdHoareTripleChecker+Valid, 831 SdHoareTripleChecker+Invalid, 1672 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 1672 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2023-12-02 08:41:26,324 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [386 Valid, 831 Invalid, 1672 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 1672 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2023-12-02 08:41:26,339 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29001 states. [2023-12-02 08:41:26,551 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29001 to 27696. [2023-12-02 08:41:26,567 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27696 states, 27694 states have (on average 1.210587130786452) internal successors, (33526), 27695 states have internal predecessors, (33526), 0 states have call successors, (0), 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 08:41:26,600 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27696 states to 27696 states and 33526 transitions. [2023-12-02 08:41:26,600 INFO L78 Accepts]: Start accepts. Automaton has 27696 states and 33526 transitions. Word has length 97 [2023-12-02 08:41:26,600 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 08:41:26,600 INFO L495 AbstractCegarLoop]: Abstraction has 27696 states and 33526 transitions. [2023-12-02 08:41:26,600 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 58 states, 57 states have (on average 4.175438596491228) internal successors, (238), 57 states have internal predecessors, (238), 0 states have call successors, (0), 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 08:41:26,601 INFO L276 IsEmpty]: Start isEmpty. Operand 27696 states and 33526 transitions. [2023-12-02 08:41:26,610 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 98 [2023-12-02 08:41:26,610 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 08:41:26,610 INFO L195 NwaCegarLoop]: trace histogram [16, 15, 15, 15, 14, 14, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 08:41:26,616 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (51)] Forceful destruction successful, exit code 0 [2023-12-02 08:41:26,811 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 51 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable62 [2023-12-02 08:41:26,811 INFO L420 AbstractCegarLoop]: === Iteration 64 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 10 more)] === [2023-12-02 08:41:26,811 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 08:41:26,811 INFO L85 PathProgramCache]: Analyzing trace with hash 1603263884, now seen corresponding path program 27 times [2023-12-02 08:41:26,811 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 08:41:26,811 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [444334212] [2023-12-02 08:41:26,812 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 08:41:26,812 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 08:41:26,858 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 08:41:28,250 INFO L134 CoverageAnalysis]: Checked inductivity of 646 backedges. 44 proven. 602 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 08:41:28,250 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 08:41:28,251 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [444334212] [2023-12-02 08:41:28,251 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [444334212] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 08:41:28,251 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1283815473] [2023-12-02 08:41:28,251 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-12-02 08:41:28,251 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 08:41:28,251 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 08:41:28,252 INFO L229 MonitoredProcess]: Starting monitored process 52 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 08:41:28,284 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (52)] Waiting until timeout for monitored process [2023-12-02 08:41:28,589 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-12-02 08:41:28,589 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 08:41:28,595 INFO L262 TraceCheckSpWp]: Trace formula consists of 563 conjuncts, 168 conjunts are in the unsatisfiable core [2023-12-02 08:41:28,598 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 08:41:29,134 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2023-12-02 08:41:29,310 INFO L134 CoverageAnalysis]: Checked inductivity of 646 backedges. 44 proven. 602 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 08:41:29,311 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 08:41:29,406 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 13 [2023-12-02 08:41:29,408 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2023-12-02 08:41:29,538 INFO L134 CoverageAnalysis]: Checked inductivity of 646 backedges. 44 proven. 602 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 08:41:29,538 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1283815473] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 08:41:29,538 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1846686088] [2023-12-02 08:41:29,539 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2023-12-02 08:41:29,539 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 08:41:29,540 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 08:41:29,540 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 08:41:29,540 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 08:41:30,150 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 08:41:32,361 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '388934#(and (<= 2 |ULTIMATE.start_cstrspn_~s2#1.base|) (= |ULTIMATE.start_cstrspn_#in~s2#1.offset| 0) (<= 2 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |ULTIMATE.start_main_#t~malloc8#1.offset| 0) (<= 0 |ULTIMATE.start_cstrspn_#t~post4#1.offset|) (<= 1 |#StackHeapBarrier|) (= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (= |ULTIMATE.start_main_~length1~0#1| 1) (= |ULTIMATE.start_cstrspn_~p~0#1.offset| 1) (= |ULTIMATE.start_cstrspn_~spanp~0#1.base| |ULTIMATE.start_cstrspn_#t~post4#1.base|) (<= 2 |ULTIMATE.start_main_#t~malloc9#1.base|) (<= 2 |ULTIMATE.start_cstrspn_#in~s1#1.base|) (= |ULTIMATE.start_cstrspn_#in~s1#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc9#1.offset| 0) (= 0 |ULTIMATE.start_cstrspn_~s2#1.offset|) (= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 2 |ULTIMATE.start_cstrspn_~p~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 2 |ULTIMATE.start_main_#t~malloc8#1.base|) (<= 2 |ULTIMATE.start_cstrspn_#in~s2#1.base|) (<= (select |#length| |ULTIMATE.start_cstrspn_#t~post4#1.base|) |ULTIMATE.start_cstrspn_#t~post4#1.offset|) (<= 2 |ULTIMATE.start_cstrspn_~s1#1.base|) (<= 2 |ULTIMATE.start_main_~nondetString1~0#1.base|) (= |ULTIMATE.start_cstrspn_~s1#1.offset| 0) (= (+ |ULTIMATE.start_cstrspn_#t~post4#1.offset| 1) |ULTIMATE.start_cstrspn_~spanp~0#1.offset|) (<= 2 |ULTIMATE.start_cstrspn_#t~post4#1.base|))' at error location [2023-12-02 08:41:32,361 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 08:41:32,362 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 08:41:32,362 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [38, 37, 37] total 60 [2023-12-02 08:41:32,362 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1535615043] [2023-12-02 08:41:32,362 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 08:41:32,362 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 60 states [2023-12-02 08:41:32,362 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 08:41:32,363 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 60 interpolants. [2023-12-02 08:41:32,363 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=221, Invalid=4888, Unknown=3, NotChecked=0, Total=5112 [2023-12-02 08:41:32,363 INFO L87 Difference]: Start difference. First operand 27696 states and 33526 transitions. Second operand has 60 states, 60 states have (on average 2.283333333333333) internal successors, (137), 60 states have internal predecessors, (137), 0 states have call successors, (0), 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 08:41:35,434 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 08:41:35,434 INFO L93 Difference]: Finished difference Result 33635 states and 40466 transitions. [2023-12-02 08:41:35,434 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 53 states. [2023-12-02 08:41:35,435 INFO L78 Accepts]: Start accepts. Automaton has has 60 states, 60 states have (on average 2.283333333333333) internal successors, (137), 60 states have internal predecessors, (137), 0 states have call successors, (0), 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 97 [2023-12-02 08:41:35,435 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 08:41:35,459 INFO L225 Difference]: With dead ends: 33635 [2023-12-02 08:41:35,459 INFO L226 Difference]: Without dead ends: 32670 [2023-12-02 08:41:35,460 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 361 GetRequests, 257 SyntacticMatches, 0 SemanticMatches, 104 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2099 ImplicationChecksByTransitivity, 4.6s TimeCoverageRelationStatistics Valid=562, Invalid=10565, Unknown=3, NotChecked=0, Total=11130 [2023-12-02 08:41:35,460 INFO L413 NwaCegarLoop]: 81 mSDtfsCounter, 421 mSDsluCounter, 3496 mSDsCounter, 0 mSdLazyCounter, 4513 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 421 SdHoareTripleChecker+Valid, 3577 SdHoareTripleChecker+Invalid, 4527 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 4513 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.7s IncrementalHoareTripleChecker+Time [2023-12-02 08:41:35,460 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [421 Valid, 3577 Invalid, 4527 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 4513 Invalid, 0 Unknown, 0 Unchecked, 1.7s Time] [2023-12-02 08:41:35,476 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32670 states. [2023-12-02 08:41:35,694 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32670 to 31136. [2023-12-02 08:41:35,711 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 31136 states, 31134 states have (on average 1.2121153722618359) internal successors, (37738), 31135 states have internal predecessors, (37738), 0 states have call successors, (0), 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 08:41:35,744 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31136 states to 31136 states and 37738 transitions. [2023-12-02 08:41:35,744 INFO L78 Accepts]: Start accepts. Automaton has 31136 states and 37738 transitions. Word has length 97 [2023-12-02 08:41:35,744 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 08:41:35,744 INFO L495 AbstractCegarLoop]: Abstraction has 31136 states and 37738 transitions. [2023-12-02 08:41:35,744 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 60 states, 60 states have (on average 2.283333333333333) internal successors, (137), 60 states have internal predecessors, (137), 0 states have call successors, (0), 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 08:41:35,745 INFO L276 IsEmpty]: Start isEmpty. Operand 31136 states and 37738 transitions. [2023-12-02 08:41:35,756 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 100 [2023-12-02 08:41:35,756 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 08:41:35,756 INFO L195 NwaCegarLoop]: trace histogram [16, 15, 15, 15, 15, 15, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 08:41:35,761 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (52)] Ended with exit code 0 [2023-12-02 08:41:35,956 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 52 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable63 [2023-12-02 08:41:35,956 INFO L420 AbstractCegarLoop]: === Iteration 65 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 10 more)] === [2023-12-02 08:41:35,957 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 08:41:35,957 INFO L85 PathProgramCache]: Analyzing trace with hash -1546738735, now seen corresponding path program 28 times [2023-12-02 08:41:35,957 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 08:41:35,957 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [315796637] [2023-12-02 08:41:35,957 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 08:41:35,957 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 08:41:35,981 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 08:41:37,374 INFO L134 CoverageAnalysis]: Checked inductivity of 675 backedges. 169 proven. 506 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 08:41:37,374 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 08:41:37,374 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [315796637] [2023-12-02 08:41:37,374 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [315796637] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 08:41:37,375 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [540723026] [2023-12-02 08:41:37,375 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-12-02 08:41:37,375 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 08:41:37,375 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 08:41:37,376 INFO L229 MonitoredProcess]: Starting monitored process 53 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 08:41:37,376 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (53)] Waiting until timeout for monitored process [2023-12-02 08:41:37,582 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 08:41:37,587 INFO L262 TraceCheckSpWp]: Trace formula consists of 576 conjuncts, 153 conjunts are in the unsatisfiable core [2023-12-02 08:41:37,589 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 08:41:38,442 INFO L134 CoverageAnalysis]: Checked inductivity of 675 backedges. 196 proven. 479 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 08:41:38,442 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 08:41:39,472 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 5 treesize of output 3 [2023-12-02 08:41:39,971 INFO L134 CoverageAnalysis]: Checked inductivity of 675 backedges. 196 proven. 479 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 08:41:39,971 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [540723026] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 08:41:39,971 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1734599274] [2023-12-02 08:41:39,972 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2023-12-02 08:41:39,973 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 08:41:39,973 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 08:41:39,973 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 08:41:39,973 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 08:41:40,661 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 08:41:43,246 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '454449#(and (<= 2 |ULTIMATE.start_cstrspn_~s2#1.base|) (= |ULTIMATE.start_cstrspn_#in~s2#1.offset| 0) (<= 2 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |ULTIMATE.start_main_#t~malloc8#1.offset| 0) (<= 0 |ULTIMATE.start_cstrspn_#t~post4#1.offset|) (<= 1 |#StackHeapBarrier|) (= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (= |ULTIMATE.start_main_~length1~0#1| 1) (= |ULTIMATE.start_cstrspn_~p~0#1.offset| 1) (= |ULTIMATE.start_cstrspn_~spanp~0#1.base| |ULTIMATE.start_cstrspn_#t~post4#1.base|) (<= 2 |ULTIMATE.start_main_#t~malloc9#1.base|) (<= 2 |ULTIMATE.start_cstrspn_#in~s1#1.base|) (= |ULTIMATE.start_cstrspn_#in~s1#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc9#1.offset| 0) (= 0 |ULTIMATE.start_cstrspn_~s2#1.offset|) (= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 2 |ULTIMATE.start_cstrspn_~p~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 2 |ULTIMATE.start_main_#t~malloc8#1.base|) (<= 2 |ULTIMATE.start_cstrspn_#in~s2#1.base|) (<= (select |#length| |ULTIMATE.start_cstrspn_#t~post4#1.base|) |ULTIMATE.start_cstrspn_#t~post4#1.offset|) (<= 2 |ULTIMATE.start_cstrspn_~s1#1.base|) (<= 2 |ULTIMATE.start_main_~nondetString1~0#1.base|) (= |ULTIMATE.start_cstrspn_~s1#1.offset| 0) (= (+ |ULTIMATE.start_cstrspn_#t~post4#1.offset| 1) |ULTIMATE.start_cstrspn_~spanp~0#1.offset|) (<= 2 |ULTIMATE.start_cstrspn_#t~post4#1.base|))' at error location [2023-12-02 08:41:43,247 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 08:41:43,247 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 08:41:43,247 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36, 36, 36] total 75 [2023-12-02 08:41:43,247 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1106425703] [2023-12-02 08:41:43,247 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 08:41:43,248 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 76 states [2023-12-02 08:41:43,248 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 08:41:43,248 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 76 interpolants. [2023-12-02 08:41:43,249 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=701, Invalid=6952, Unknown=3, NotChecked=0, Total=7656 [2023-12-02 08:41:43,249 INFO L87 Difference]: Start difference. First operand 31136 states and 37738 transitions. Second operand has 76 states, 75 states have (on average 2.7066666666666666) internal successors, (203), 76 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 08:41:45,833 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 08:41:45,833 INFO L93 Difference]: Finished difference Result 33467 states and 40270 transitions. [2023-12-02 08:41:45,834 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 55 states. [2023-12-02 08:41:45,834 INFO L78 Accepts]: Start accepts. Automaton has has 76 states, 75 states have (on average 2.7066666666666666) internal successors, (203), 76 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) Word has length 99 [2023-12-02 08:41:45,834 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 08:41:45,860 INFO L225 Difference]: With dead ends: 33467 [2023-12-02 08:41:45,860 INFO L226 Difference]: Without dead ends: 33467 [2023-12-02 08:41:45,861 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 367 GetRequests, 229 SyntacticMatches, 16 SemanticMatches, 122 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5674 ImplicationChecksByTransitivity, 6.2s TimeCoverageRelationStatistics Valid=1404, Invalid=13845, Unknown=3, NotChecked=0, Total=15252 [2023-12-02 08:41:45,861 INFO L413 NwaCegarLoop]: 71 mSDtfsCounter, 793 mSDsluCounter, 1536 mSDsCounter, 0 mSdLazyCounter, 2883 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 793 SdHoareTripleChecker+Valid, 1607 SdHoareTripleChecker+Invalid, 2884 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 2883 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.2s IncrementalHoareTripleChecker+Time [2023-12-02 08:41:45,862 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [793 Valid, 1607 Invalid, 2884 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 2883 Invalid, 0 Unknown, 0 Unchecked, 1.2s Time] [2023-12-02 08:41:45,878 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33467 states. [2023-12-02 08:41:46,131 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33467 to 31404. [2023-12-02 08:41:46,148 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 31404 states, 31402 states have (on average 1.2124068530666836) internal successors, (38072), 31403 states have internal predecessors, (38072), 0 states have call successors, (0), 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 08:41:46,182 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31404 states to 31404 states and 38072 transitions. [2023-12-02 08:41:46,182 INFO L78 Accepts]: Start accepts. Automaton has 31404 states and 38072 transitions. Word has length 99 [2023-12-02 08:41:46,182 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 08:41:46,182 INFO L495 AbstractCegarLoop]: Abstraction has 31404 states and 38072 transitions. [2023-12-02 08:41:46,183 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 76 states, 75 states have (on average 2.7066666666666666) internal successors, (203), 76 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 08:41:46,183 INFO L276 IsEmpty]: Start isEmpty. Operand 31404 states and 38072 transitions. [2023-12-02 08:41:46,199 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 102 [2023-12-02 08:41:46,199 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 08:41:46,199 INFO L195 NwaCegarLoop]: trace histogram [12, 12, 12, 12, 11, 11, 10, 10, 2, 2, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 08:41:46,206 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (53)] Ended with exit code 0 [2023-12-02 08:41:46,400 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable64,53 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 08:41:46,400 INFO L420 AbstractCegarLoop]: === Iteration 66 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 10 more)] === [2023-12-02 08:41:46,400 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 08:41:46,400 INFO L85 PathProgramCache]: Analyzing trace with hash -868153502, now seen corresponding path program 3 times [2023-12-02 08:41:46,401 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 08:41:46,401 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [432532800] [2023-12-02 08:41:46,401 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 08:41:46,401 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 08:41:46,438 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 08:41:47,622 INFO L134 CoverageAnalysis]: Checked inductivity of 500 backedges. 22 proven. 471 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2023-12-02 08:41:47,622 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 08:41:47,622 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [432532800] [2023-12-02 08:41:47,622 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [432532800] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 08:41:47,622 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [60595104] [2023-12-02 08:41:47,622 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-12-02 08:41:47,622 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 08:41:47,622 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 08:41:47,623 INFO L229 MonitoredProcess]: Starting monitored process 54 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 08:41:47,624 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (54)] Waiting until timeout for monitored process [2023-12-02 08:41:47,990 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-12-02 08:41:47,990 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 08:41:47,997 INFO L262 TraceCheckSpWp]: Trace formula consists of 674 conjuncts, 212 conjunts are in the unsatisfiable core [2023-12-02 08:41:48,001 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 08:41:48,683 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 1 [2023-12-02 08:41:48,806 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2023-12-02 08:41:48,874 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 19 treesize of output 18 [2023-12-02 08:41:51,823 INFO L349 Elim1Store]: treesize reduction 13, result has 23.5 percent of original size [2023-12-02 08:41:51,824 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 6 select indices, 6 select index equivalence classes, 6 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 15 case distinctions, treesize of input 52 treesize of output 24 [2023-12-02 08:41:51,881 INFO L134 CoverageAnalysis]: Checked inductivity of 500 backedges. 22 proven. 478 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 08:41:51,881 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 08:41:54,977 INFO L349 Elim1Store]: treesize reduction 22, result has 68.1 percent of original size [2023-12-02 08:41:54,977 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 2 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 618 treesize of output 297 [2023-12-02 08:41:55,005 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-12-02 08:41:55,005 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 521 treesize of output 511 [2023-12-02 08:41:55,055 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 8 [2023-12-02 08:41:55,106 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-12-02 08:41:55,106 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 4 select indices, 4 select index equivalence classes, 3 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 3 case distinctions, treesize of input 269 treesize of output 283 [2023-12-02 08:41:55,459 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 0 case distinctions, treesize of input 29 treesize of output 23 [2023-12-02 08:41:55,634 INFO L349 Elim1Store]: treesize reduction 15, result has 86.0 percent of original size [2023-12-02 08:41:55,634 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 6 select indices, 6 select index equivalence classes, 0 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 15 case distinctions, treesize of input 271 treesize of output 315 [2023-12-02 08:41:57,105 INFO L134 CoverageAnalysis]: Checked inductivity of 500 backedges. 27 proven. 473 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 08:41:57,106 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [60595104] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 08:41:57,106 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [615030980] [2023-12-02 08:41:57,106 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2023-12-02 08:41:57,106 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 08:41:57,107 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 08:41:57,107 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 08:41:57,107 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 08:41:58,784 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 08:42:01,165 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '520121#(and (= |ULTIMATE.start_cstrspn_#in~s2#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc8#1.offset| 0) (= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (or (< (select |#length| |ULTIMATE.start_cstrspn_#t~post2#1.base|) (+ |ULTIMATE.start_cstrspn_#t~post2#1.offset| 1)) (< |ULTIMATE.start_cstrspn_#t~post2#1.offset| 0)) (= |ULTIMATE.start_cstrspn_#in~s1#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc9#1.offset| 0) (= 0 |ULTIMATE.start_cstrspn_~s2#1.offset|) (= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (= |ULTIMATE.start_cstrspn_~s1#1.offset| 0))' at error location [2023-12-02 08:42:01,165 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 08:42:01,165 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 08:42:01,166 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 45, 45] total 116 [2023-12-02 08:42:01,166 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [557201785] [2023-12-02 08:42:01,166 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 08:42:01,166 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 117 states [2023-12-02 08:42:01,166 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 08:42:01,167 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 117 interpolants. [2023-12-02 08:42:01,168 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=568, Invalid=16202, Unknown=0, NotChecked=0, Total=16770 [2023-12-02 08:42:01,168 INFO L87 Difference]: Start difference. First operand 31404 states and 38072 transitions. Second operand has 117 states, 117 states have (on average 2.5128205128205128) internal successors, (294), 116 states have internal predecessors, (294), 0 states have call successors, (0), 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 08:42:21,976 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 08:42:21,977 INFO L93 Difference]: Finished difference Result 32296 states and 38911 transitions. [2023-12-02 08:42:21,977 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 179 states. [2023-12-02 08:42:21,977 INFO L78 Accepts]: Start accepts. Automaton has has 117 states, 117 states have (on average 2.5128205128205128) internal successors, (294), 116 states have internal predecessors, (294), 0 states have call successors, (0), 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 101 [2023-12-02 08:42:21,977 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 08:42:21,993 INFO L225 Difference]: With dead ends: 32296 [2023-12-02 08:42:21,993 INFO L226 Difference]: Without dead ends: 22159 [2023-12-02 08:42:21,997 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 500 GetRequests, 203 SyntacticMatches, 0 SemanticMatches, 297 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22728 ImplicationChecksByTransitivity, 24.6s TimeCoverageRelationStatistics Valid=4869, Invalid=84233, Unknown=0, NotChecked=0, Total=89102 [2023-12-02 08:42:21,997 INFO L413 NwaCegarLoop]: 87 mSDtfsCounter, 1536 mSDsluCounter, 4111 mSDsCounter, 0 mSdLazyCounter, 9049 mSolverCounterSat, 39 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1536 SdHoareTripleChecker+Valid, 4198 SdHoareTripleChecker+Invalid, 9088 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 39 IncrementalHoareTripleChecker+Valid, 9049 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 5.1s IncrementalHoareTripleChecker+Time [2023-12-02 08:42:21,997 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1536 Valid, 4198 Invalid, 9088 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [39 Valid, 9049 Invalid, 0 Unknown, 0 Unchecked, 5.1s Time] [2023-12-02 08:42:22,010 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22159 states. [2023-12-02 08:42:22,157 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22159 to 20556. [2023-12-02 08:42:22,168 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20556 states, 20554 states have (on average 1.2119295514255133) internal successors, (24910), 20555 states have internal predecessors, (24910), 0 states have call successors, (0), 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 08:42:22,189 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20556 states to 20556 states and 24910 transitions. [2023-12-02 08:42:22,189 INFO L78 Accepts]: Start accepts. Automaton has 20556 states and 24910 transitions. Word has length 101 [2023-12-02 08:42:22,189 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 08:42:22,189 INFO L495 AbstractCegarLoop]: Abstraction has 20556 states and 24910 transitions. [2023-12-02 08:42:22,189 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 117 states, 117 states have (on average 2.5128205128205128) internal successors, (294), 116 states have internal predecessors, (294), 0 states have call successors, (0), 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 08:42:22,189 INFO L276 IsEmpty]: Start isEmpty. Operand 20556 states and 24910 transitions. [2023-12-02 08:42:22,195 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 104 [2023-12-02 08:42:22,195 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 08:42:22,196 INFO L195 NwaCegarLoop]: trace histogram [13, 12, 12, 12, 12, 12, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 08:42:22,202 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (54)] Ended with exit code 0 [2023-12-02 08:42:22,396 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 54 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable65 [2023-12-02 08:42:22,396 INFO L420 AbstractCegarLoop]: === Iteration 67 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 10 more)] === [2023-12-02 08:42:22,396 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 08:42:22,396 INFO L85 PathProgramCache]: Analyzing trace with hash 124846573, now seen corresponding path program 21 times [2023-12-02 08:42:22,396 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 08:42:22,397 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [759038598] [2023-12-02 08:42:22,397 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 08:42:22,397 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 08:42:22,434 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 08:42:24,061 INFO L134 CoverageAnalysis]: Checked inductivity of 542 backedges. 24 proven. 517 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 08:42:24,061 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 08:42:24,061 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [759038598] [2023-12-02 08:42:24,061 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [759038598] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 08:42:24,061 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1923580601] [2023-12-02 08:42:24,061 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-12-02 08:42:24,062 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 08:42:24,062 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 08:42:24,062 INFO L229 MonitoredProcess]: Starting monitored process 55 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 08:42:24,063 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (55)] Waiting until timeout for monitored process [2023-12-02 08:42:24,576 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-12-02 08:42:24,577 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 08:42:24,583 INFO L262 TraceCheckSpWp]: Trace formula consists of 693 conjuncts, 190 conjunts are in the unsatisfiable core [2023-12-02 08:42:24,586 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 08:42:25,398 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2023-12-02 08:42:25,502 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-12-02 08:42:25,502 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 21 treesize of output 20 [2023-12-02 08:42:29,188 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-12-02 08:42:29,190 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-12-02 08:42:29,202 INFO L349 Elim1Store]: treesize reduction 4, result has 76.5 percent of original size [2023-12-02 08:42:29,202 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 5 select indices, 5 select index equivalence classes, 5 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 8 case distinctions, treesize of input 50 treesize of output 32 [2023-12-02 08:42:29,499 INFO L134 CoverageAnalysis]: Checked inductivity of 542 backedges. 100 proven. 442 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 08:42:29,499 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 08:42:32,890 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2023-12-02 08:42:32,919 INFO L349 Elim1Store]: treesize reduction 38, result has 45.7 percent of original size [2023-12-02 08:42:32,919 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 345 treesize of output 265 [2023-12-02 08:42:32,935 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-12-02 08:42:32,936 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 65 treesize of output 61 [2023-12-02 08:42:32,954 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 70 treesize of output 64 [2023-12-02 08:42:32,972 INFO L173 IndexEqualityManager]: detected equality via solver [2023-12-02 08:42:32,974 INFO L173 IndexEqualityManager]: detected equality via solver [2023-12-02 08:42:32,986 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-12-02 08:42:32,986 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 4 select indices, 4 select index equivalence classes, 3 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 3 case distinctions, treesize of input 107 treesize of output 100 [2023-12-02 08:42:35,956 INFO L134 CoverageAnalysis]: Checked inductivity of 542 backedges. 100 proven. 442 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 08:42:35,956 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1923580601] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 08:42:35,957 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1815133634] [2023-12-02 08:42:35,957 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2023-12-02 08:42:35,957 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 08:42:35,958 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 08:42:35,958 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 08:42:35,958 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 08:42:37,083 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 08:42:42,031 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '574054#(and (<= 0 |ULTIMATE.start_cstrspn_#t~post2#1.offset|) (or (and (= |ULTIMATE.start_cstrspn_#in~s2#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc8#1.offset| 0) (= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (= |ULTIMATE.start_cstrspn_#in~s1#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc9#1.offset| 0) (= 0 |ULTIMATE.start_cstrspn_~s2#1.offset|) (= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (= |ULTIMATE.start_cstrspn_~s1#1.offset| 0) (= |ULTIMATE.start_cstrspn_~spanp~0#1.offset| 1)) (and (= |ULTIMATE.start_cstrspn_#in~s2#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc8#1.offset| 0) (= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (= |ULTIMATE.start_cstrspn_~p~0#1.offset| 1) (= |ULTIMATE.start_cstrspn_#in~s1#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc9#1.offset| 0) (= 0 |ULTIMATE.start_cstrspn_~s2#1.offset|) (= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (= |ULTIMATE.start_cstrspn_~s1#1.offset| 0) (= |ULTIMATE.start_cstrspn_#t~post2#1.offset| 0))) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 1 |ULTIMATE.start_cstrspn_~p~0#1.offset|) (<= (select |#length| |ULTIMATE.start_cstrspn_#t~post2#1.base|) |ULTIMATE.start_cstrspn_#t~post2#1.offset|))' at error location [2023-12-02 08:42:42,031 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 08:42:42,031 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 08:42:42,031 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37, 40, 40] total 117 [2023-12-02 08:42:42,031 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [347084192] [2023-12-02 08:42:42,031 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 08:42:42,032 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 118 states [2023-12-02 08:42:42,032 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 08:42:42,032 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 118 interpolants. [2023-12-02 08:42:42,033 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=795, Invalid=16234, Unknown=1, NotChecked=0, Total=17030 [2023-12-02 08:42:42,033 INFO L87 Difference]: Start difference. First operand 20556 states and 24910 transitions. Second operand has 118 states, 118 states have (on average 2.6186440677966103) internal successors, (309), 117 states have internal predecessors, (309), 0 states have call successors, (0), 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 08:43:09,812 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 08:43:09,812 INFO L93 Difference]: Finished difference Result 33118 states and 40081 transitions. [2023-12-02 08:43:09,813 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 168 states. [2023-12-02 08:43:09,813 INFO L78 Accepts]: Start accepts. Automaton has has 118 states, 118 states have (on average 2.6186440677966103) internal successors, (309), 117 states have internal predecessors, (309), 0 states have call successors, (0), 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 103 [2023-12-02 08:43:09,813 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 08:43:09,841 INFO L225 Difference]: With dead ends: 33118 [2023-12-02 08:43:09,841 INFO L226 Difference]: Without dead ends: 33044 [2023-12-02 08:43:09,844 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 503 GetRequests, 215 SyntacticMatches, 0 SemanticMatches, 288 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19392 ImplicationChecksByTransitivity, 36.5s TimeCoverageRelationStatistics Valid=5339, Invalid=78470, Unknown=1, NotChecked=0, Total=83810 [2023-12-02 08:43:09,845 INFO L413 NwaCegarLoop]: 74 mSDtfsCounter, 1064 mSDsluCounter, 4131 mSDsCounter, 0 mSdLazyCounter, 8353 mSolverCounterSat, 16 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1064 SdHoareTripleChecker+Valid, 4205 SdHoareTripleChecker+Invalid, 8369 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 16 IncrementalHoareTripleChecker+Valid, 8353 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 5.0s IncrementalHoareTripleChecker+Time [2023-12-02 08:43:09,845 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1064 Valid, 4205 Invalid, 8369 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [16 Valid, 8353 Invalid, 0 Unknown, 0 Unchecked, 5.0s Time] [2023-12-02 08:43:09,863 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33044 states. [2023-12-02 08:43:10,141 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33044 to 30935. [2023-12-02 08:43:10,158 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 30935 states, 30933 states have (on average 1.2115863317492646) internal successors, (37478), 30934 states have internal predecessors, (37478), 0 states have call successors, (0), 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 08:43:10,191 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30935 states to 30935 states and 37478 transitions. [2023-12-02 08:43:10,191 INFO L78 Accepts]: Start accepts. Automaton has 30935 states and 37478 transitions. Word has length 103 [2023-12-02 08:43:10,191 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 08:43:10,191 INFO L495 AbstractCegarLoop]: Abstraction has 30935 states and 37478 transitions. [2023-12-02 08:43:10,191 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 118 states, 118 states have (on average 2.6186440677966103) internal successors, (309), 117 states have internal predecessors, (309), 0 states have call successors, (0), 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 08:43:10,191 INFO L276 IsEmpty]: Start isEmpty. Operand 30935 states and 37478 transitions. [2023-12-02 08:43:10,201 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 104 [2023-12-02 08:43:10,201 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 08:43:10,201 INFO L195 NwaCegarLoop]: trace histogram [17, 16, 16, 16, 15, 15, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 08:43:10,208 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (55)] Ended with exit code 0 [2023-12-02 08:43:10,402 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable66,55 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 08:43:10,402 INFO L420 AbstractCegarLoop]: === Iteration 68 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 10 more)] === [2023-12-02 08:43:10,402 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 08:43:10,402 INFO L85 PathProgramCache]: Analyzing trace with hash 318054997, now seen corresponding path program 29 times [2023-12-02 08:43:10,402 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 08:43:10,403 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1016282852] [2023-12-02 08:43:10,403 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 08:43:10,403 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 08:43:10,431 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 08:43:11,907 INFO L134 CoverageAnalysis]: Checked inductivity of 737 backedges. 47 proven. 690 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 08:43:11,907 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 08:43:11,907 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1016282852] [2023-12-02 08:43:11,907 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1016282852] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 08:43:11,907 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1287724148] [2023-12-02 08:43:11,907 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-12-02 08:43:11,907 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 08:43:11,907 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 08:43:11,908 INFO L229 MonitoredProcess]: Starting monitored process 56 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 08:43:11,909 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (56)] Waiting until timeout for monitored process [2023-12-02 08:43:12,792 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 17 check-sat command(s) [2023-12-02 08:43:12,792 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 08:43:12,799 INFO L262 TraceCheckSpWp]: Trace formula consists of 594 conjuncts, 180 conjunts are in the unsatisfiable core [2023-12-02 08:43:12,801 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 08:43:13,373 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2023-12-02 08:43:13,554 INFO L134 CoverageAnalysis]: Checked inductivity of 737 backedges. 47 proven. 690 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 08:43:13,554 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 08:43:13,659 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 13 [2023-12-02 08:43:13,661 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2023-12-02 08:43:13,812 INFO L134 CoverageAnalysis]: Checked inductivity of 737 backedges. 47 proven. 690 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 08:43:13,812 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1287724148] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 08:43:13,812 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1909055924] [2023-12-02 08:43:13,813 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2023-12-02 08:43:13,813 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 08:43:13,813 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 08:43:13,813 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 08:43:13,813 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 08:43:14,427 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 08:43:16,817 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '639113#(and (<= 2 |ULTIMATE.start_cstrspn_~s2#1.base|) (= |ULTIMATE.start_cstrspn_#in~s2#1.offset| 0) (<= 2 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |ULTIMATE.start_main_#t~malloc8#1.offset| 0) (<= 0 |ULTIMATE.start_cstrspn_#t~post4#1.offset|) (<= 1 |#StackHeapBarrier|) (= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (= |ULTIMATE.start_main_~length1~0#1| 1) (= |ULTIMATE.start_cstrspn_~p~0#1.offset| 1) (= |ULTIMATE.start_cstrspn_~spanp~0#1.base| |ULTIMATE.start_cstrspn_#t~post4#1.base|) (<= 2 |ULTIMATE.start_main_#t~malloc9#1.base|) (<= 2 |ULTIMATE.start_cstrspn_#in~s1#1.base|) (= |ULTIMATE.start_cstrspn_#in~s1#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc9#1.offset| 0) (= 0 |ULTIMATE.start_cstrspn_~s2#1.offset|) (= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 2 |ULTIMATE.start_cstrspn_~p~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 2 |ULTIMATE.start_main_#t~malloc8#1.base|) (<= 2 |ULTIMATE.start_cstrspn_#in~s2#1.base|) (<= (select |#length| |ULTIMATE.start_cstrspn_#t~post4#1.base|) |ULTIMATE.start_cstrspn_#t~post4#1.offset|) (<= 2 |ULTIMATE.start_cstrspn_~s1#1.base|) (<= 2 |ULTIMATE.start_main_~nondetString1~0#1.base|) (= |ULTIMATE.start_cstrspn_~s1#1.offset| 0) (= (+ |ULTIMATE.start_cstrspn_#t~post4#1.offset| 1) |ULTIMATE.start_cstrspn_~spanp~0#1.offset|) (<= 2 |ULTIMATE.start_cstrspn_#t~post4#1.base|))' at error location [2023-12-02 08:43:16,817 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 08:43:16,817 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 08:43:16,817 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [40, 39, 39] total 63 [2023-12-02 08:43:16,817 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1119271097] [2023-12-02 08:43:16,817 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 08:43:16,818 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 63 states [2023-12-02 08:43:16,818 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 08:43:16,818 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 63 interpolants. [2023-12-02 08:43:16,819 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=229, Invalid=5319, Unknown=2, NotChecked=0, Total=5550 [2023-12-02 08:43:16,819 INFO L87 Difference]: Start difference. First operand 30935 states and 37478 transitions. Second operand has 63 states, 63 states have (on average 2.3015873015873014) internal successors, (145), 63 states have internal predecessors, (145), 0 states have call successors, (0), 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 08:43:20,289 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 08:43:20,289 INFO L93 Difference]: Finished difference Result 37363 states and 44964 transitions. [2023-12-02 08:43:20,289 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 56 states. [2023-12-02 08:43:20,290 INFO L78 Accepts]: Start accepts. Automaton has has 63 states, 63 states have (on average 2.3015873015873014) internal successors, (145), 63 states have internal predecessors, (145), 0 states have call successors, (0), 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 103 [2023-12-02 08:43:20,290 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 08:43:20,312 INFO L225 Difference]: With dead ends: 37363 [2023-12-02 08:43:20,312 INFO L226 Difference]: Without dead ends: 36159 [2023-12-02 08:43:20,313 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 383 GetRequests, 274 SyntacticMatches, 0 SemanticMatches, 109 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2297 ImplicationChecksByTransitivity, 5.1s TimeCoverageRelationStatistics Valid=589, Invalid=11619, Unknown=2, NotChecked=0, Total=12210 [2023-12-02 08:43:20,313 INFO L413 NwaCegarLoop]: 86 mSDtfsCounter, 449 mSDsluCounter, 3513 mSDsCounter, 0 mSdLazyCounter, 4622 mSolverCounterSat, 15 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 449 SdHoareTripleChecker+Valid, 3599 SdHoareTripleChecker+Invalid, 4637 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 15 IncrementalHoareTripleChecker+Valid, 4622 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.8s IncrementalHoareTripleChecker+Time [2023-12-02 08:43:20,313 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [449 Valid, 3599 Invalid, 4637 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [15 Valid, 4622 Invalid, 0 Unknown, 0 Unchecked, 1.8s Time] [2023-12-02 08:43:20,328 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36159 states. [2023-12-02 08:43:20,547 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36159 to 34537. [2023-12-02 08:43:20,566 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 34537 states, 34535 states have (on average 1.2130302591573765) internal successors, (41892), 34536 states have internal predecessors, (41892), 0 states have call successors, (0), 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 08:43:20,601 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34537 states to 34537 states and 41892 transitions. [2023-12-02 08:43:20,601 INFO L78 Accepts]: Start accepts. Automaton has 34537 states and 41892 transitions. Word has length 103 [2023-12-02 08:43:20,601 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 08:43:20,601 INFO L495 AbstractCegarLoop]: Abstraction has 34537 states and 41892 transitions. [2023-12-02 08:43:20,601 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 63 states, 63 states have (on average 2.3015873015873014) internal successors, (145), 63 states have internal predecessors, (145), 0 states have call successors, (0), 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 08:43:20,601 INFO L276 IsEmpty]: Start isEmpty. Operand 34537 states and 41892 transitions. [2023-12-02 08:43:20,611 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 106 [2023-12-02 08:43:20,611 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 08:43:20,611 INFO L195 NwaCegarLoop]: trace histogram [13, 13, 13, 13, 12, 12, 9, 9, 2, 2, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 08:43:20,617 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (56)] Ended with exit code 0 [2023-12-02 08:43:20,811 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable67,56 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 08:43:20,812 INFO L420 AbstractCegarLoop]: === Iteration 69 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 10 more)] === [2023-12-02 08:43:20,812 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 08:43:20,812 INFO L85 PathProgramCache]: Analyzing trace with hash -1774249638, now seen corresponding path program 4 times [2023-12-02 08:43:20,812 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 08:43:20,812 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [971363649] [2023-12-02 08:43:20,812 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 08:43:20,812 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 08:43:20,841 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 08:43:22,751 INFO L134 CoverageAnalysis]: Checked inductivity of 553 backedges. 0 proven. 545 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2023-12-02 08:43:22,751 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 08:43:22,752 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [971363649] [2023-12-02 08:43:22,752 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [971363649] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 08:43:22,752 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1204963547] [2023-12-02 08:43:22,752 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-12-02 08:43:22,752 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 08:43:22,752 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 08:43:22,753 INFO L229 MonitoredProcess]: Starting monitored process 57 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 08:43:22,754 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (57)] Waiting until timeout for monitored process [2023-12-02 08:43:23,016 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 08:43:23,022 INFO L262 TraceCheckSpWp]: Trace formula consists of 698 conjuncts, 125 conjunts are in the unsatisfiable core [2023-12-02 08:43:23,025 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 08:43:23,724 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2023-12-02 08:43:23,813 INFO L349 Elim1Store]: treesize reduction 29, result has 19.4 percent of original size [2023-12-02 08:43:23,813 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 22 treesize of output 21 [2023-12-02 08:43:25,310 INFO L134 CoverageAnalysis]: Checked inductivity of 553 backedges. 149 proven. 387 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2023-12-02 08:43:25,310 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 08:43:26,403 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 44 treesize of output 38 [2023-12-02 08:43:27,215 INFO L134 CoverageAnalysis]: Checked inductivity of 553 backedges. 148 proven. 388 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2023-12-02 08:43:27,215 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1204963547] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 08:43:27,215 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [986115890] [2023-12-02 08:43:27,216 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2023-12-02 08:43:27,216 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 08:43:27,216 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 08:43:27,216 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 08:43:27,216 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 08:43:28,912 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 08:43:30,946 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '711803#(and (= |ULTIMATE.start_cstrspn_#in~s2#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc8#1.offset| 0) (= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (or (< (select |#length| |ULTIMATE.start_cstrspn_#t~post2#1.base|) (+ |ULTIMATE.start_cstrspn_#t~post2#1.offset| 1)) (< |ULTIMATE.start_cstrspn_#t~post2#1.offset| 0)) (= |ULTIMATE.start_cstrspn_#in~s1#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc9#1.offset| 0) (= 0 |ULTIMATE.start_cstrspn_~s2#1.offset|) (= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (= |ULTIMATE.start_cstrspn_~s1#1.offset| 0))' at error location [2023-12-02 08:43:30,946 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 08:43:30,946 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 08:43:30,946 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 27, 27] total 81 [2023-12-02 08:43:30,947 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1114111024] [2023-12-02 08:43:30,947 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 08:43:30,947 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 82 states [2023-12-02 08:43:30,947 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 08:43:30,947 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 82 interpolants. [2023-12-02 08:43:30,948 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=250, Invalid=8680, Unknown=0, NotChecked=0, Total=8930 [2023-12-02 08:43:30,948 INFO L87 Difference]: Start difference. First operand 34537 states and 41892 transitions. Second operand has 82 states, 82 states have (on average 3.3780487804878048) internal successors, (277), 81 states have internal predecessors, (277), 0 states have call successors, (0), 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 08:43:41,134 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 08:43:41,135 INFO L93 Difference]: Finished difference Result 33492 states and 40326 transitions. [2023-12-02 08:43:41,135 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 69 states. [2023-12-02 08:43:41,135 INFO L78 Accepts]: Start accepts. Automaton has has 82 states, 82 states have (on average 3.3780487804878048) internal successors, (277), 81 states have internal predecessors, (277), 0 states have call successors, (0), 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 105 [2023-12-02 08:43:41,135 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 08:43:41,153 INFO L225 Difference]: With dead ends: 33492 [2023-12-02 08:43:41,153 INFO L226 Difference]: Without dead ends: 24200 [2023-12-02 08:43:41,154 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 406 GetRequests, 249 SyntacticMatches, 0 SemanticMatches, 157 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3739 ImplicationChecksByTransitivity, 13.4s TimeCoverageRelationStatistics Valid=1006, Invalid=24116, Unknown=0, NotChecked=0, Total=25122 [2023-12-02 08:43:41,154 INFO L413 NwaCegarLoop]: 51 mSDtfsCounter, 602 mSDsluCounter, 3254 mSDsCounter, 0 mSdLazyCounter, 6214 mSolverCounterSat, 31 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 602 SdHoareTripleChecker+Valid, 3305 SdHoareTripleChecker+Invalid, 6245 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 31 IncrementalHoareTripleChecker+Valid, 6214 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.1s IncrementalHoareTripleChecker+Time [2023-12-02 08:43:41,154 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [602 Valid, 3305 Invalid, 6245 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [31 Valid, 6214 Invalid, 0 Unknown, 0 Unchecked, 3.1s Time] [2023-12-02 08:43:41,170 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24200 states. [2023-12-02 08:43:41,356 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24200 to 19883. [2023-12-02 08:43:41,367 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19883 states, 19881 states have (on average 1.2092953070771089) internal successors, (24042), 19882 states have internal predecessors, (24042), 0 states have call successors, (0), 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 08:43:41,387 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19883 states to 19883 states and 24042 transitions. [2023-12-02 08:43:41,388 INFO L78 Accepts]: Start accepts. Automaton has 19883 states and 24042 transitions. Word has length 105 [2023-12-02 08:43:41,388 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 08:43:41,388 INFO L495 AbstractCegarLoop]: Abstraction has 19883 states and 24042 transitions. [2023-12-02 08:43:41,388 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 82 states, 82 states have (on average 3.3780487804878048) internal successors, (277), 81 states have internal predecessors, (277), 0 states have call successors, (0), 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 08:43:41,388 INFO L276 IsEmpty]: Start isEmpty. Operand 19883 states and 24042 transitions. [2023-12-02 08:43:41,394 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 106 [2023-12-02 08:43:41,394 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 08:43:41,395 INFO L195 NwaCegarLoop]: trace histogram [17, 16, 16, 16, 16, 16, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 08:43:41,401 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (57)] Ended with exit code 0 [2023-12-02 08:43:41,595 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable68,57 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 08:43:41,595 INFO L420 AbstractCegarLoop]: === Iteration 70 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 10 more)] === [2023-12-02 08:43:41,595 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 08:43:41,596 INFO L85 PathProgramCache]: Analyzing trace with hash 76898522, now seen corresponding path program 30 times [2023-12-02 08:43:41,596 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 08:43:41,596 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1111806533] [2023-12-02 08:43:41,596 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 08:43:41,596 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 08:43:41,621 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 08:43:43,061 INFO L134 CoverageAnalysis]: Checked inductivity of 768 backedges. 196 proven. 572 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 08:43:43,061 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 08:43:43,061 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1111806533] [2023-12-02 08:43:43,061 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1111806533] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 08:43:43,061 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1365553291] [2023-12-02 08:43:43,061 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-12-02 08:43:43,061 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 08:43:43,061 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 08:43:43,062 INFO L229 MonitoredProcess]: Starting monitored process 58 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 08:43:43,063 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (58)] Waiting until timeout for monitored process [2023-12-02 08:43:43,378 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-12-02 08:43:43,378 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 08:43:43,383 INFO L262 TraceCheckSpWp]: Trace formula consists of 607 conjuncts, 168 conjunts are in the unsatisfiable core [2023-12-02 08:43:43,386 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 08:43:43,390 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 08:43:44,277 INFO L134 CoverageAnalysis]: Checked inductivity of 768 backedges. 225 proven. 543 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 08:43:44,278 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 08:43:46,471 INFO L134 CoverageAnalysis]: Checked inductivity of 768 backedges. 225 proven. 543 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 08:43:46,472 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1365553291] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 08:43:46,472 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1431962778] [2023-12-02 08:43:46,472 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2023-12-02 08:43:46,473 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 08:43:46,473 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 08:43:46,473 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 08:43:46,473 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 08:43:47,075 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 08:43:49,357 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '766040#(and (<= 2 |ULTIMATE.start_cstrspn_~s2#1.base|) (= |ULTIMATE.start_cstrspn_#in~s2#1.offset| 0) (<= 2 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |ULTIMATE.start_main_#t~malloc8#1.offset| 0) (<= 0 |ULTIMATE.start_cstrspn_#t~post4#1.offset|) (<= 1 |#StackHeapBarrier|) (= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (= |ULTIMATE.start_main_~length1~0#1| 1) (= |ULTIMATE.start_cstrspn_~p~0#1.offset| 1) (= |ULTIMATE.start_cstrspn_~spanp~0#1.base| |ULTIMATE.start_cstrspn_#t~post4#1.base|) (<= 2 |ULTIMATE.start_main_#t~malloc9#1.base|) (<= 2 |ULTIMATE.start_cstrspn_#in~s1#1.base|) (= |ULTIMATE.start_cstrspn_#in~s1#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc9#1.offset| 0) (= 0 |ULTIMATE.start_cstrspn_~s2#1.offset|) (= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 2 |ULTIMATE.start_cstrspn_~p~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 2 |ULTIMATE.start_main_#t~malloc8#1.base|) (<= 2 |ULTIMATE.start_cstrspn_#in~s2#1.base|) (<= (select |#length| |ULTIMATE.start_cstrspn_#t~post4#1.base|) |ULTIMATE.start_cstrspn_#t~post4#1.offset|) (<= 2 |ULTIMATE.start_cstrspn_~s1#1.base|) (<= 2 |ULTIMATE.start_main_~nondetString1~0#1.base|) (= |ULTIMATE.start_cstrspn_~s1#1.offset| 0) (= (+ |ULTIMATE.start_cstrspn_#t~post4#1.offset| 1) |ULTIMATE.start_cstrspn_~spanp~0#1.offset|) (<= 2 |ULTIMATE.start_cstrspn_#t~post4#1.base|))' at error location [2023-12-02 08:43:49,357 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 08:43:49,357 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 08:43:49,357 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [38, 37, 37] total 95 [2023-12-02 08:43:49,357 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [278262839] [2023-12-02 08:43:49,358 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 08:43:49,358 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 97 states [2023-12-02 08:43:49,358 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 08:43:49,359 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 97 interpolants. [2023-12-02 08:43:49,359 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1311, Invalid=10460, Unknown=1, NotChecked=0, Total=11772 [2023-12-02 08:43:49,360 INFO L87 Difference]: Start difference. First operand 19883 states and 24042 transitions. Second operand has 97 states, 96 states have (on average 2.6145833333333335) internal successors, (251), 96 states have internal predecessors, (251), 0 states have call successors, (0), 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 08:43:53,136 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 08:43:53,136 INFO L93 Difference]: Finished difference Result 21457 states and 25657 transitions. [2023-12-02 08:43:53,136 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 58 states. [2023-12-02 08:43:53,136 INFO L78 Accepts]: Start accepts. Automaton has has 97 states, 96 states have (on average 2.6145833333333335) internal successors, (251), 96 states have internal predecessors, (251), 0 states have call successors, (0), 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 105 [2023-12-02 08:43:53,136 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 08:43:53,150 INFO L225 Difference]: With dead ends: 21457 [2023-12-02 08:43:53,150 INFO L226 Difference]: Without dead ends: 21457 [2023-12-02 08:43:53,152 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 389 GetRequests, 244 SyntacticMatches, 0 SemanticMatches, 145 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6937 ImplicationChecksByTransitivity, 7.2s TimeCoverageRelationStatistics Valid=2774, Invalid=18687, Unknown=1, NotChecked=0, Total=21462 [2023-12-02 08:43:53,152 INFO L413 NwaCegarLoop]: 75 mSDtfsCounter, 1075 mSDsluCounter, 1661 mSDsCounter, 0 mSdLazyCounter, 3158 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1075 SdHoareTripleChecker+Valid, 1736 SdHoareTripleChecker+Invalid, 3162 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 3158 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.6s IncrementalHoareTripleChecker+Time [2023-12-02 08:43:53,152 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1075 Valid, 1736 Invalid, 3162 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 3158 Invalid, 0 Unknown, 0 Unchecked, 1.6s Time] [2023-12-02 08:43:53,162 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21457 states. [2023-12-02 08:43:53,341 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21457 to 20055. [2023-12-02 08:43:53,352 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20055 states, 20053 states have (on average 1.2095945743778986) internal successors, (24256), 20054 states have internal predecessors, (24256), 0 states have call successors, (0), 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 08:43:53,371 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20055 states to 20055 states and 24256 transitions. [2023-12-02 08:43:53,371 INFO L78 Accepts]: Start accepts. Automaton has 20055 states and 24256 transitions. Word has length 105 [2023-12-02 08:43:53,372 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 08:43:53,372 INFO L495 AbstractCegarLoop]: Abstraction has 20055 states and 24256 transitions. [2023-12-02 08:43:53,372 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 97 states, 96 states have (on average 2.6145833333333335) internal successors, (251), 96 states have internal predecessors, (251), 0 states have call successors, (0), 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 08:43:53,372 INFO L276 IsEmpty]: Start isEmpty. Operand 20055 states and 24256 transitions. [2023-12-02 08:43:53,378 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 110 [2023-12-02 08:43:53,378 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 08:43:53,378 INFO L195 NwaCegarLoop]: trace histogram [13, 13, 13, 13, 12, 12, 11, 11, 2, 2, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 08:43:53,384 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (58)] Ended with exit code 0 [2023-12-02 08:43:53,578 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable69,58 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 08:43:53,578 INFO L420 AbstractCegarLoop]: === Iteration 71 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 10 more)] === [2023-12-02 08:43:53,579 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 08:43:53,579 INFO L85 PathProgramCache]: Analyzing trace with hash 661856438, now seen corresponding path program 5 times [2023-12-02 08:43:53,579 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 08:43:53,579 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [896606928] [2023-12-02 08:43:53,579 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 08:43:53,579 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 08:43:53,612 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 08:43:55,122 INFO L134 CoverageAnalysis]: Checked inductivity of 593 backedges. 24 proven. 562 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2023-12-02 08:43:55,122 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 08:43:55,123 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [896606928] [2023-12-02 08:43:55,123 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [896606928] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 08:43:55,123 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [35492765] [2023-12-02 08:43:55,123 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-12-02 08:43:55,123 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 08:43:55,123 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 08:43:55,124 INFO L229 MonitoredProcess]: Starting monitored process 59 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 08:43:55,125 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (59)] Waiting until timeout for monitored process [2023-12-02 08:43:55,976 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 13 check-sat command(s) [2023-12-02 08:43:55,977 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 08:43:55,983 INFO L262 TraceCheckSpWp]: Trace formula consists of 724 conjuncts, 143 conjunts are in the unsatisfiable core [2023-12-02 08:43:55,987 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 08:43:55,993 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 16 [2023-12-02 08:43:56,527 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 13 treesize of output 9 [2023-12-02 08:43:56,570 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 18 treesize of output 13 [2023-12-02 08:43:56,738 INFO L134 CoverageAnalysis]: Checked inductivity of 593 backedges. 25 proven. 561 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2023-12-02 08:43:56,739 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 08:43:56,824 WARN L854 $PredicateComparison]: unable to prove that (forall ((v_ArrVal_2862 (Array Int Int))) (= (select (select (store |c_#memory_int| |c_ULTIMATE.start_main_~nondetString2~0#1.base| v_ArrVal_2862) |c_ULTIMATE.start_main_~nondetString1~0#1.base|) (+ 11 |c_ULTIMATE.start_main_~nondetString1~0#1.offset|)) 0)) is different from false [2023-12-02 08:43:56,828 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-12-02 08:43:56,828 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 23 treesize of output 24 [2023-12-02 08:43:56,833 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-12-02 08:43:56,833 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 37 treesize of output 32 [2023-12-02 08:43:56,998 INFO L134 CoverageAnalysis]: Checked inductivity of 593 backedges. 24 proven. 562 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2023-12-02 08:43:56,998 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [35492765] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 08:43:56,998 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1471939698] [2023-12-02 08:43:56,999 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2023-12-02 08:43:56,999 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 08:43:56,999 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 08:43:56,999 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 08:43:56,999 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 08:43:58,381 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 08:43:59,199 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '808341#(or (< (select |#length| |ULTIMATE.start_cstrspn_#t~post2#1.base|) (+ |ULTIMATE.start_cstrspn_#t~post2#1.offset| 1)) (< |ULTIMATE.start_cstrspn_#t~post2#1.offset| 0))' at error location [2023-12-02 08:43:59,199 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 08:43:59,199 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 08:43:59,199 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 31, 31] total 52 [2023-12-02 08:43:59,199 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [366513483] [2023-12-02 08:43:59,199 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 08:43:59,200 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 53 states [2023-12-02 08:43:59,200 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 08:43:59,200 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2023-12-02 08:43:59,201 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=160, Invalid=3625, Unknown=1, NotChecked=120, Total=3906 [2023-12-02 08:43:59,201 INFO L87 Difference]: Start difference. First operand 20055 states and 24256 transitions. Second operand has 53 states, 53 states have (on average 2.69811320754717) internal successors, (143), 52 states have internal predecessors, (143), 0 states have call successors, (0), 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 08:44:02,419 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 08:44:02,420 INFO L93 Difference]: Finished difference Result 20554 states and 24730 transitions. [2023-12-02 08:44:02,420 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 56 states. [2023-12-02 08:44:02,420 INFO L78 Accepts]: Start accepts. Automaton has has 53 states, 53 states have (on average 2.69811320754717) internal successors, (143), 52 states have internal predecessors, (143), 0 states have call successors, (0), 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 109 [2023-12-02 08:44:02,420 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 08:44:02,431 INFO L225 Difference]: With dead ends: 20554 [2023-12-02 08:44:02,431 INFO L226 Difference]: Without dead ends: 14478 [2023-12-02 08:44:02,431 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 396 GetRequests, 296 SyntacticMatches, 0 SemanticMatches, 100 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 1361 ImplicationChecksByTransitivity, 3.6s TimeCoverageRelationStatistics Valid=526, Invalid=9577, Unknown=1, NotChecked=198, Total=10302 [2023-12-02 08:44:02,432 INFO L413 NwaCegarLoop]: 79 mSDtfsCounter, 417 mSDsluCounter, 2747 mSDsCounter, 0 mSdLazyCounter, 3651 mSolverCounterSat, 15 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 417 SdHoareTripleChecker+Valid, 2826 SdHoareTripleChecker+Invalid, 3837 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 15 IncrementalHoareTripleChecker+Valid, 3651 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 171 IncrementalHoareTripleChecker+Unchecked, 1.5s IncrementalHoareTripleChecker+Time [2023-12-02 08:44:02,432 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [417 Valid, 2826 Invalid, 3837 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [15 Valid, 3651 Invalid, 0 Unknown, 171 Unchecked, 1.5s Time] [2023-12-02 08:44:02,439 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14478 states. [2023-12-02 08:44:02,551 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14478 to 13673. [2023-12-02 08:44:02,560 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 13673 states, 13671 states have (on average 1.2087630751225222) internal successors, (16525), 13672 states have internal predecessors, (16525), 0 states have call successors, (0), 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 08:44:02,577 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13673 states to 13673 states and 16525 transitions. [2023-12-02 08:44:02,577 INFO L78 Accepts]: Start accepts. Automaton has 13673 states and 16525 transitions. Word has length 109 [2023-12-02 08:44:02,577 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 08:44:02,577 INFO L495 AbstractCegarLoop]: Abstraction has 13673 states and 16525 transitions. [2023-12-02 08:44:02,578 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 53 states, 53 states have (on average 2.69811320754717) internal successors, (143), 52 states have internal predecessors, (143), 0 states have call successors, (0), 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 08:44:02,578 INFO L276 IsEmpty]: Start isEmpty. Operand 13673 states and 16525 transitions. [2023-12-02 08:44:02,583 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 110 [2023-12-02 08:44:02,583 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 08:44:02,583 INFO L195 NwaCegarLoop]: trace histogram [18, 17, 17, 17, 16, 16, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 08:44:02,591 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (59)] Ended with exit code 0 [2023-12-02 08:44:02,784 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable70,59 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 08:44:02,784 INFO L420 AbstractCegarLoop]: === Iteration 72 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 10 more)] === [2023-12-02 08:44:02,785 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 08:44:02,785 INFO L85 PathProgramCache]: Analyzing trace with hash 143930078, now seen corresponding path program 31 times [2023-12-02 08:44:02,785 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 08:44:02,785 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [98316985] [2023-12-02 08:44:02,785 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 08:44:02,785 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 08:44:02,825 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 08:44:04,725 INFO L134 CoverageAnalysis]: Checked inductivity of 834 backedges. 50 proven. 784 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 08:44:04,725 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 08:44:04,725 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [98316985] [2023-12-02 08:44:04,725 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [98316985] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 08:44:04,725 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1618814429] [2023-12-02 08:44:04,725 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-12-02 08:44:04,726 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 08:44:04,726 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 08:44:04,727 INFO L229 MonitoredProcess]: Starting monitored process 60 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 08:44:04,728 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (60)] Waiting until timeout for monitored process [2023-12-02 08:44:05,012 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 08:44:05,019 INFO L262 TraceCheckSpWp]: Trace formula consists of 625 conjuncts, 190 conjunts are in the unsatisfiable core [2023-12-02 08:44:05,022 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 08:44:05,781 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2023-12-02 08:44:05,983 INFO L134 CoverageAnalysis]: Checked inductivity of 834 backedges. 50 proven. 784 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 08:44:05,983 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 08:44:06,096 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 13 [2023-12-02 08:44:06,098 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2023-12-02 08:44:06,254 INFO L134 CoverageAnalysis]: Checked inductivity of 834 backedges. 50 proven. 784 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 08:44:06,254 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1618814429] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 08:44:06,254 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [717310432] [2023-12-02 08:44:06,255 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2023-12-02 08:44:06,255 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 08:44:06,255 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 08:44:06,255 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 08:44:06,256 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 08:44:06,959 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 08:44:09,875 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '843370#(and (<= 2 |ULTIMATE.start_cstrspn_~s2#1.base|) (= |ULTIMATE.start_cstrspn_#in~s2#1.offset| 0) (<= 2 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |ULTIMATE.start_main_#t~malloc8#1.offset| 0) (<= 0 |ULTIMATE.start_cstrspn_#t~post4#1.offset|) (<= 1 |#StackHeapBarrier|) (= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (= |ULTIMATE.start_main_~length1~0#1| 1) (= |ULTIMATE.start_cstrspn_~p~0#1.offset| 1) (= |ULTIMATE.start_cstrspn_~spanp~0#1.base| |ULTIMATE.start_cstrspn_#t~post4#1.base|) (<= 2 |ULTIMATE.start_main_#t~malloc9#1.base|) (<= 2 |ULTIMATE.start_cstrspn_#in~s1#1.base|) (= |ULTIMATE.start_cstrspn_#in~s1#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc9#1.offset| 0) (= 0 |ULTIMATE.start_cstrspn_~s2#1.offset|) (= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 2 |ULTIMATE.start_cstrspn_~p~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 2 |ULTIMATE.start_main_#t~malloc8#1.base|) (<= 2 |ULTIMATE.start_cstrspn_#in~s2#1.base|) (<= (select |#length| |ULTIMATE.start_cstrspn_#t~post4#1.base|) |ULTIMATE.start_cstrspn_#t~post4#1.offset|) (<= 2 |ULTIMATE.start_cstrspn_~s1#1.base|) (<= 2 |ULTIMATE.start_main_~nondetString1~0#1.base|) (= |ULTIMATE.start_cstrspn_~s1#1.offset| 0) (= (+ |ULTIMATE.start_cstrspn_#t~post4#1.offset| 1) |ULTIMATE.start_cstrspn_~spanp~0#1.offset|) (<= 2 |ULTIMATE.start_cstrspn_#t~post4#1.base|))' at error location [2023-12-02 08:44:09,875 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 08:44:09,875 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 08:44:09,876 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [42, 41, 41] total 66 [2023-12-02 08:44:09,876 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [852642073] [2023-12-02 08:44:09,876 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 08:44:09,876 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 66 states [2023-12-02 08:44:09,876 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 08:44:09,877 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 66 interpolants. [2023-12-02 08:44:09,877 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=239, Invalid=5766, Unknown=1, NotChecked=0, Total=6006 [2023-12-02 08:44:09,877 INFO L87 Difference]: Start difference. First operand 13673 states and 16525 transitions. Second operand has 66 states, 66 states have (on average 2.3181818181818183) internal successors, (153), 66 states have internal predecessors, (153), 0 states have call successors, (0), 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 08:44:13,951 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 08:44:13,952 INFO L93 Difference]: Finished difference Result 17019 states and 20364 transitions. [2023-12-02 08:44:13,952 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 59 states. [2023-12-02 08:44:13,952 INFO L78 Accepts]: Start accepts. Automaton has has 66 states, 66 states have (on average 2.3181818181818183) internal successors, (153), 66 states have internal predecessors, (153), 0 states have call successors, (0), 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 109 [2023-12-02 08:44:13,952 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 08:44:13,987 INFO L225 Difference]: With dead ends: 17019 [2023-12-02 08:44:13,987 INFO L226 Difference]: Without dead ends: 15752 [2023-12-02 08:44:13,988 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 405 GetRequests, 291 SyntacticMatches, 0 SemanticMatches, 114 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2512 ImplicationChecksByTransitivity, 6.2s TimeCoverageRelationStatistics Valid=618, Invalid=12721, Unknown=1, NotChecked=0, Total=13340 [2023-12-02 08:44:13,988 INFO L413 NwaCegarLoop]: 91 mSDtfsCounter, 374 mSDsluCounter, 4383 mSDsCounter, 0 mSdLazyCounter, 5659 mSolverCounterSat, 16 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 374 SdHoareTripleChecker+Valid, 4474 SdHoareTripleChecker+Invalid, 5675 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 16 IncrementalHoareTripleChecker+Valid, 5659 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.3s IncrementalHoareTripleChecker+Time [2023-12-02 08:44:13,988 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [374 Valid, 4474 Invalid, 5675 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [16 Valid, 5659 Invalid, 0 Unknown, 0 Unchecked, 2.3s Time] [2023-12-02 08:44:13,993 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15752 states. [2023-12-02 08:44:14,079 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15752 to 15095. [2023-12-02 08:44:14,087 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 15095 states, 15093 states have (on average 1.2101636520241172) internal successors, (18265), 15094 states have internal predecessors, (18265), 0 states have call successors, (0), 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 08:44:14,101 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15095 states to 15095 states and 18265 transitions. [2023-12-02 08:44:14,101 INFO L78 Accepts]: Start accepts. Automaton has 15095 states and 18265 transitions. Word has length 109 [2023-12-02 08:44:14,101 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 08:44:14,101 INFO L495 AbstractCegarLoop]: Abstraction has 15095 states and 18265 transitions. [2023-12-02 08:44:14,101 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 66 states, 66 states have (on average 2.3181818181818183) internal successors, (153), 66 states have internal predecessors, (153), 0 states have call successors, (0), 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 08:44:14,101 INFO L276 IsEmpty]: Start isEmpty. Operand 15095 states and 18265 transitions. [2023-12-02 08:44:14,106 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 112 [2023-12-02 08:44:14,106 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 08:44:14,106 INFO L195 NwaCegarLoop]: trace histogram [13, 13, 13, 13, 12, 12, 12, 12, 2, 2, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 08:44:14,111 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (60)] Ended with exit code 0 [2023-12-02 08:44:14,306 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable71,60 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 08:44:14,307 INFO L420 AbstractCegarLoop]: === Iteration 73 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 10 more)] === [2023-12-02 08:44:14,307 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 08:44:14,307 INFO L85 PathProgramCache]: Analyzing trace with hash -1713250524, now seen corresponding path program 6 times [2023-12-02 08:44:14,307 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 08:44:14,307 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1055478787] [2023-12-02 08:44:14,307 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 08:44:14,307 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 08:44:14,335 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 08:44:15,290 INFO L134 CoverageAnalysis]: Checked inductivity of 616 backedges. 100 proven. 508 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2023-12-02 08:44:15,291 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 08:44:15,291 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1055478787] [2023-12-02 08:44:15,291 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1055478787] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 08:44:15,291 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2078808646] [2023-12-02 08:44:15,291 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-12-02 08:44:15,291 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 08:44:15,291 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 08:44:15,292 INFO L229 MonitoredProcess]: Starting monitored process 61 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 08:44:15,293 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (61)] Waiting until timeout for monitored process [2023-12-02 08:44:15,790 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-12-02 08:44:15,790 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 08:44:15,796 INFO L262 TraceCheckSpWp]: Trace formula consists of 737 conjuncts, 131 conjunts are in the unsatisfiable core [2023-12-02 08:44:15,798 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 08:44:16,604 INFO L134 CoverageAnalysis]: Checked inductivity of 616 backedges. 121 proven. 487 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2023-12-02 08:44:16,604 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 08:44:17,402 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2023-12-02 08:44:17,998 INFO L134 CoverageAnalysis]: Checked inductivity of 616 backedges. 121 proven. 487 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2023-12-02 08:44:17,999 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2078808646] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 08:44:17,999 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1728581011] [2023-12-02 08:44:17,999 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2023-12-02 08:44:18,000 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 08:44:18,000 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 08:44:18,000 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 08:44:18,000 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 08:44:19,378 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 08:44:20,301 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '876306#(or (< (select |#length| |ULTIMATE.start_cstrspn_#t~post2#1.base|) (+ |ULTIMATE.start_cstrspn_#t~post2#1.offset| 1)) (< |ULTIMATE.start_cstrspn_#t~post2#1.offset| 0))' at error location [2023-12-02 08:44:20,302 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 08:44:20,302 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 08:44:20,302 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 28, 28] total 72 [2023-12-02 08:44:20,302 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1856520652] [2023-12-02 08:44:20,302 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 08:44:20,303 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 74 states [2023-12-02 08:44:20,303 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 08:44:20,303 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 74 interpolants. [2023-12-02 08:44:20,304 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=669, Invalid=6303, Unknown=0, NotChecked=0, Total=6972 [2023-12-02 08:44:20,304 INFO L87 Difference]: Start difference. First operand 15095 states and 18265 transitions. Second operand has 74 states, 73 states have (on average 3.356164383561644) internal successors, (245), 73 states have internal predecessors, (245), 0 states have call successors, (0), 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 08:44:23,270 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 08:44:23,270 INFO L93 Difference]: Finished difference Result 15782 states and 19077 transitions. [2023-12-02 08:44:23,271 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2023-12-02 08:44:23,271 INFO L78 Accepts]: Start accepts. Automaton has has 74 states, 73 states have (on average 3.356164383561644) internal successors, (245), 73 states have internal predecessors, (245), 0 states have call successors, (0), 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 111 [2023-12-02 08:44:23,271 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 08:44:23,282 INFO L225 Difference]: With dead ends: 15782 [2023-12-02 08:44:23,282 INFO L226 Difference]: Without dead ends: 15782 [2023-12-02 08:44:23,283 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 389 GetRequests, 278 SyntacticMatches, 0 SemanticMatches, 111 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3512 ImplicationChecksByTransitivity, 4.0s TimeCoverageRelationStatistics Valid=1178, Invalid=11478, Unknown=0, NotChecked=0, Total=12656 [2023-12-02 08:44:23,284 INFO L413 NwaCegarLoop]: 51 mSDtfsCounter, 495 mSDsluCounter, 1298 mSDsCounter, 0 mSdLazyCounter, 2741 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 495 SdHoareTripleChecker+Valid, 1349 SdHoareTripleChecker+Invalid, 2741 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 2741 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.6s IncrementalHoareTripleChecker+Time [2023-12-02 08:44:23,284 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [495 Valid, 1349 Invalid, 2741 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 2741 Invalid, 0 Unknown, 0 Unchecked, 1.6s Time] [2023-12-02 08:44:23,292 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15782 states. [2023-12-02 08:44:23,388 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15782 to 9863. [2023-12-02 08:44:23,394 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 9863 states, 9861 states have (on average 1.2080924855491328) internal successors, (11913), 9862 states have internal predecessors, (11913), 0 states have call successors, (0), 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 08:44:23,407 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9863 states to 9863 states and 11913 transitions. [2023-12-02 08:44:23,407 INFO L78 Accepts]: Start accepts. Automaton has 9863 states and 11913 transitions. Word has length 111 [2023-12-02 08:44:23,407 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 08:44:23,407 INFO L495 AbstractCegarLoop]: Abstraction has 9863 states and 11913 transitions. [2023-12-02 08:44:23,408 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 74 states, 73 states have (on average 3.356164383561644) internal successors, (245), 73 states have internal predecessors, (245), 0 states have call successors, (0), 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 08:44:23,408 INFO L276 IsEmpty]: Start isEmpty. Operand 9863 states and 11913 transitions. [2023-12-02 08:44:23,412 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 112 [2023-12-02 08:44:23,412 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 08:44:23,412 INFO L195 NwaCegarLoop]: trace histogram [14, 13, 13, 13, 13, 13, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 08:44:23,420 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (61)] Ended with exit code 0 [2023-12-02 08:44:23,612 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable72,61 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 08:44:23,613 INFO L420 AbstractCegarLoop]: === Iteration 74 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 10 more)] === [2023-12-02 08:44:23,613 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 08:44:23,613 INFO L85 PathProgramCache]: Analyzing trace with hash -1949412479, now seen corresponding path program 22 times [2023-12-02 08:44:23,613 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 08:44:23,613 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [652249761] [2023-12-02 08:44:23,613 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 08:44:23,613 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 08:44:23,652 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 08:44:25,851 INFO L134 CoverageAnalysis]: Checked inductivity of 639 backedges. 26 proven. 612 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 08:44:25,852 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 08:44:25,852 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [652249761] [2023-12-02 08:44:25,852 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [652249761] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 08:44:25,852 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [383121554] [2023-12-02 08:44:25,852 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-12-02 08:44:25,852 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 08:44:25,852 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 08:44:25,853 INFO L229 MonitoredProcess]: Starting monitored process 62 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 08:44:25,854 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (62)] Waiting until timeout for monitored process [2023-12-02 08:44:26,201 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 08:44:26,209 INFO L262 TraceCheckSpWp]: Trace formula consists of 743 conjuncts, 198 conjunts are in the unsatisfiable core [2023-12-02 08:44:26,213 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 08:44:27,573 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2023-12-02 08:44:27,680 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-12-02 08:44:27,680 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 08:44:31,093 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-12-02 08:44:31,095 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-12-02 08:44:31,105 INFO L349 Elim1Store]: treesize reduction 18, result has 37.9 percent of original size [2023-12-02 08:44:31,105 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 4 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 45 treesize of output 28 [2023-12-02 08:44:31,179 INFO L134 CoverageAnalysis]: Checked inductivity of 639 backedges. 26 proven. 613 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 08:44:31,179 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 08:44:33,482 INFO L349 Elim1Store]: treesize reduction 36, result has 45.5 percent of original size [2023-12-02 08:44:33,483 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 378 treesize of output 303 [2023-12-02 08:44:33,497 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-12-02 08:44:33,498 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 203 treesize of output 191 [2023-12-02 08:44:33,511 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 78 treesize of output 72 [2023-12-02 08:44:33,552 INFO L173 IndexEqualityManager]: detected equality via solver [2023-12-02 08:44:33,578 INFO L349 Elim1Store]: treesize reduction 5, result has 87.2 percent of original size [2023-12-02 08:44:33,578 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 4 select indices, 4 select index equivalence classes, 2 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 4 case distinctions, treesize of input 95 treesize of output 97 [2023-12-02 08:44:35,239 INFO L134 CoverageAnalysis]: Checked inductivity of 639 backedges. 32 proven. 607 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 08:44:35,239 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [383121554] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 08:44:35,239 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [395691116] [2023-12-02 08:44:35,240 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2023-12-02 08:44:35,240 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 08:44:35,240 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 08:44:35,240 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 08:44:35,240 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 08:44:36,150 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 08:44:39,109 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '902801#(or (< (select |#length| |ULTIMATE.start_cstrspn_#t~post2#1.base|) (+ |ULTIMATE.start_cstrspn_#t~post2#1.offset| 1)) (< |ULTIMATE.start_cstrspn_#t~post2#1.offset| 0))' at error location [2023-12-02 08:44:39,109 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 08:44:39,109 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 08:44:39,109 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39, 42, 43] total 121 [2023-12-02 08:44:39,109 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1910888225] [2023-12-02 08:44:39,109 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 08:44:39,110 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 122 states [2023-12-02 08:44:39,110 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 08:44:39,111 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 122 interpolants. [2023-12-02 08:44:39,113 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=487, Invalid=17069, Unknown=0, NotChecked=0, Total=17556 [2023-12-02 08:44:39,113 INFO L87 Difference]: Start difference. First operand 9863 states and 11913 transitions. Second operand has 122 states, 122 states have (on average 2.6885245901639343) internal successors, (328), 121 states have internal predecessors, (328), 0 states have call successors, (0), 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 08:44:55,642 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 08:44:55,642 INFO L93 Difference]: Finished difference Result 18558 states and 22421 transitions. [2023-12-02 08:44:55,642 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 110 states. [2023-12-02 08:44:55,643 INFO L78 Accepts]: Start accepts. Automaton has has 122 states, 122 states have (on average 2.6885245901639343) internal successors, (328), 121 states have internal predecessors, (328), 0 states have call successors, (0), 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 111 [2023-12-02 08:44:55,643 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 08:44:55,658 INFO L225 Difference]: With dead ends: 18558 [2023-12-02 08:44:55,658 INFO L226 Difference]: Without dead ends: 18478 [2023-12-02 08:44:55,661 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 474 GetRequests, 239 SyntacticMatches, 0 SemanticMatches, 235 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11463 ImplicationChecksByTransitivity, 22.0s TimeCoverageRelationStatistics Valid=2434, Invalid=53498, Unknown=0, NotChecked=0, Total=55932 [2023-12-02 08:44:55,662 INFO L413 NwaCegarLoop]: 68 mSDtfsCounter, 1356 mSDsluCounter, 4793 mSDsCounter, 0 mSdLazyCounter, 8597 mSolverCounterSat, 33 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1356 SdHoareTripleChecker+Valid, 4861 SdHoareTripleChecker+Invalid, 8630 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.1s SdHoareTripleChecker+Time, 33 IncrementalHoareTripleChecker+Valid, 8597 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 5.2s IncrementalHoareTripleChecker+Time [2023-12-02 08:44:55,662 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1356 Valid, 4861 Invalid, 8630 Unknown, 0 Unchecked, 0.1s Time], IncrementalHoareTripleChecker [33 Valid, 8597 Invalid, 0 Unknown, 0 Unchecked, 5.2s Time] [2023-12-02 08:44:55,672 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18478 states. [2023-12-02 08:44:55,821 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18478 to 17732. [2023-12-02 08:44:55,833 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 17732 states, 17730 states have (on average 1.2100958826847152) internal successors, (21455), 17731 states have internal predecessors, (21455), 0 states have call successors, (0), 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 08:44:55,857 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17732 states to 17732 states and 21455 transitions. [2023-12-02 08:44:55,857 INFO L78 Accepts]: Start accepts. Automaton has 17732 states and 21455 transitions. Word has length 111 [2023-12-02 08:44:55,857 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 08:44:55,857 INFO L495 AbstractCegarLoop]: Abstraction has 17732 states and 21455 transitions. [2023-12-02 08:44:55,857 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 122 states, 122 states have (on average 2.6885245901639343) internal successors, (328), 121 states have internal predecessors, (328), 0 states have call successors, (0), 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 08:44:55,857 INFO L276 IsEmpty]: Start isEmpty. Operand 17732 states and 21455 transitions. [2023-12-02 08:44:55,865 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 112 [2023-12-02 08:44:55,865 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 08:44:55,865 INFO L195 NwaCegarLoop]: trace histogram [18, 17, 17, 17, 17, 17, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 08:44:55,872 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (62)] Ended with exit code 0 [2023-12-02 08:44:56,065 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable73,62 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 08:44:56,066 INFO L420 AbstractCegarLoop]: === Iteration 75 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 10 more)] === [2023-12-02 08:44:56,066 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 08:44:56,066 INFO L85 PathProgramCache]: Analyzing trace with hash -2144683613, now seen corresponding path program 32 times [2023-12-02 08:44:56,066 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 08:44:56,066 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1778111975] [2023-12-02 08:44:56,066 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 08:44:56,066 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 08:44:56,099 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 08:44:57,725 INFO L134 CoverageAnalysis]: Checked inductivity of 867 backedges. 225 proven. 642 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 08:44:57,725 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 08:44:57,725 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1778111975] [2023-12-02 08:44:57,725 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1778111975] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 08:44:57,725 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1926231860] [2023-12-02 08:44:57,725 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-12-02 08:44:57,726 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 08:44:57,726 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 08:44:57,726 INFO L229 MonitoredProcess]: Starting monitored process 63 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 08:44:57,727 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (63)] Waiting until timeout for monitored process [2023-12-02 08:44:58,678 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 18 check-sat command(s) [2023-12-02 08:44:58,678 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 08:44:58,684 INFO L262 TraceCheckSpWp]: Trace formula consists of 638 conjuncts, 139 conjunts are in the unsatisfiable core [2023-12-02 08:44:58,687 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 08:45:00,066 INFO L134 CoverageAnalysis]: Checked inductivity of 867 backedges. 256 proven. 611 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 08:45:00,066 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 08:45:01,507 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 7 treesize of output 5 [2023-12-02 08:45:02,032 INFO L134 CoverageAnalysis]: Checked inductivity of 867 backedges. 256 proven. 611 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 08:45:02,032 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1926231860] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 08:45:02,032 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [4900118] [2023-12-02 08:45:02,033 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2023-12-02 08:45:02,033 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 08:45:02,033 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 08:45:02,033 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 08:45:02,034 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 08:45:02,650 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 08:45:04,936 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '940072#(and (<= 2 |ULTIMATE.start_cstrspn_~s2#1.base|) (= |ULTIMATE.start_cstrspn_#in~s2#1.offset| 0) (<= 2 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |ULTIMATE.start_main_#t~malloc8#1.offset| 0) (<= 0 |ULTIMATE.start_cstrspn_#t~post4#1.offset|) (<= 1 |#StackHeapBarrier|) (= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (= |ULTIMATE.start_main_~length1~0#1| 1) (= |ULTIMATE.start_cstrspn_~p~0#1.offset| 1) (= |ULTIMATE.start_cstrspn_~spanp~0#1.base| |ULTIMATE.start_cstrspn_#t~post4#1.base|) (<= 2 |ULTIMATE.start_main_#t~malloc9#1.base|) (<= 2 |ULTIMATE.start_cstrspn_#in~s1#1.base|) (= |ULTIMATE.start_cstrspn_#in~s1#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc9#1.offset| 0) (= 0 |ULTIMATE.start_cstrspn_~s2#1.offset|) (= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 2 |ULTIMATE.start_cstrspn_~p~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 2 |ULTIMATE.start_main_#t~malloc8#1.base|) (<= 2 |ULTIMATE.start_cstrspn_#in~s2#1.base|) (<= (select |#length| |ULTIMATE.start_cstrspn_#t~post4#1.base|) |ULTIMATE.start_cstrspn_#t~post4#1.offset|) (<= 2 |ULTIMATE.start_cstrspn_~s1#1.base|) (<= 2 |ULTIMATE.start_main_~nondetString1~0#1.base|) (= |ULTIMATE.start_cstrspn_~s1#1.offset| 0) (= (+ |ULTIMATE.start_cstrspn_#t~post4#1.offset| 1) |ULTIMATE.start_cstrspn_~spanp~0#1.offset|) (<= 2 |ULTIMATE.start_cstrspn_#t~post4#1.base|))' at error location [2023-12-02 08:45:04,936 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 08:45:04,937 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 08:45:04,937 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [40, 40, 40] total 101 [2023-12-02 08:45:04,937 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [297830143] [2023-12-02 08:45:04,937 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 08:45:04,937 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 102 states [2023-12-02 08:45:04,937 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 08:45:04,938 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 102 interpolants. [2023-12-02 08:45:04,938 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1516, Invalid=11364, Unknown=2, NotChecked=0, Total=12882 [2023-12-02 08:45:04,939 INFO L87 Difference]: Start difference. First operand 17732 states and 21455 transitions. Second operand has 102 states, 101 states have (on average 2.9207920792079207) internal successors, (295), 102 states have internal predecessors, (295), 0 states have call successors, (0), 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 08:45:07,730 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 08:45:07,731 INFO L93 Difference]: Finished difference Result 19159 states and 22917 transitions. [2023-12-02 08:45:07,731 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 61 states. [2023-12-02 08:45:07,731 INFO L78 Accepts]: Start accepts. Automaton has has 102 states, 101 states have (on average 2.9207920792079207) internal successors, (295), 102 states have internal predecessors, (295), 0 states have call successors, (0), 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 111 [2023-12-02 08:45:07,731 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 08:45:07,744 INFO L225 Difference]: With dead ends: 19159 [2023-12-02 08:45:07,744 INFO L226 Difference]: Without dead ends: 19159 [2023-12-02 08:45:07,745 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 411 GetRequests, 241 SyntacticMatches, 18 SemanticMatches, 152 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9296 ImplicationChecksByTransitivity, 7.3s TimeCoverageRelationStatistics Valid=2726, Invalid=20834, Unknown=2, NotChecked=0, Total=23562 [2023-12-02 08:45:07,745 INFO L413 NwaCegarLoop]: 79 mSDtfsCounter, 633 mSDsluCounter, 1734 mSDsCounter, 0 mSdLazyCounter, 2859 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 633 SdHoareTripleChecker+Valid, 1813 SdHoareTripleChecker+Invalid, 2860 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 2859 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.1s IncrementalHoareTripleChecker+Time [2023-12-02 08:45:07,745 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [633 Valid, 1813 Invalid, 2860 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 2859 Invalid, 0 Unknown, 0 Unchecked, 1.1s Time] [2023-12-02 08:45:07,754 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19159 states. [2023-12-02 08:45:07,919 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19159 to 17880. [2023-12-02 08:45:07,926 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 17880 states, 17878 states have (on average 1.210370287504195) internal successors, (21639), 17879 states have internal predecessors, (21639), 0 states have call successors, (0), 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 08:45:07,943 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17880 states to 17880 states and 21639 transitions. [2023-12-02 08:45:07,943 INFO L78 Accepts]: Start accepts. Automaton has 17880 states and 21639 transitions. Word has length 111 [2023-12-02 08:45:07,943 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 08:45:07,943 INFO L495 AbstractCegarLoop]: Abstraction has 17880 states and 21639 transitions. [2023-12-02 08:45:07,943 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 102 states, 101 states have (on average 2.9207920792079207) internal successors, (295), 102 states have internal predecessors, (295), 0 states have call successors, (0), 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 08:45:07,944 INFO L276 IsEmpty]: Start isEmpty. Operand 17880 states and 21639 transitions. [2023-12-02 08:45:07,949 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 114 [2023-12-02 08:45:07,949 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 08:45:07,949 INFO L195 NwaCegarLoop]: trace histogram [14, 13, 13, 13, 13, 13, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 08:45:07,955 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (63)] Ended with exit code 0 [2023-12-02 08:45:08,149 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable74,63 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 08:45:08,149 INFO L420 AbstractCegarLoop]: === Iteration 76 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 10 more)] === [2023-12-02 08:45:08,150 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 08:45:08,150 INFO L85 PathProgramCache]: Analyzing trace with hash 495398511, now seen corresponding path program 23 times [2023-12-02 08:45:08,150 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 08:45:08,150 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1166482136] [2023-12-02 08:45:08,150 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 08:45:08,150 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 08:45:08,180 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 08:45:09,306 INFO L134 CoverageAnalysis]: Checked inductivity of 664 backedges. 121 proven. 542 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 08:45:09,306 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 08:45:09,306 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1166482136] [2023-12-02 08:45:09,306 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1166482136] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 08:45:09,306 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2017811195] [2023-12-02 08:45:09,306 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-12-02 08:45:09,306 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 08:45:09,306 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 08:45:09,307 INFO L229 MonitoredProcess]: Starting monitored process 64 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 08:45:09,308 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (64)] Waiting until timeout for monitored process [2023-12-02 08:45:10,476 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 14 check-sat command(s) [2023-12-02 08:45:10,476 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 08:45:10,484 INFO L262 TraceCheckSpWp]: Trace formula consists of 756 conjuncts, 109 conjunts are in the unsatisfiable core [2023-12-02 08:45:10,487 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 08:45:11,386 INFO L134 CoverageAnalysis]: Checked inductivity of 664 backedges. 144 proven. 519 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 08:45:11,386 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 08:45:12,829 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 7 treesize of output 5 [2023-12-02 08:45:13,000 INFO L134 CoverageAnalysis]: Checked inductivity of 664 backedges. 144 proven. 519 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 08:45:13,000 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2017811195] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 08:45:13,000 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [839901695] [2023-12-02 08:45:13,001 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2023-12-02 08:45:13,001 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 08:45:13,002 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 08:45:13,002 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 08:45:13,002 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 08:45:14,035 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 08:45:15,539 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '977941#(or (< (select |#length| |ULTIMATE.start_cstrspn_#t~post2#1.base|) (+ |ULTIMATE.start_cstrspn_#t~post2#1.offset| 1)) (< |ULTIMATE.start_cstrspn_#t~post2#1.offset| 0))' at error location [2023-12-02 08:45:15,539 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 08:45:15,539 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 08:45:15,539 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 31, 31] total 64 [2023-12-02 08:45:15,539 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1565057919] [2023-12-02 08:45:15,539 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 08:45:15,539 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 66 states [2023-12-02 08:45:15,540 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 08:45:15,540 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 66 interpolants. [2023-12-02 08:45:15,540 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=710, Invalid=5142, Unknown=0, NotChecked=0, Total=5852 [2023-12-02 08:45:15,540 INFO L87 Difference]: Start difference. First operand 17880 states and 21639 transitions. Second operand has 66 states, 65 states have (on average 4.276923076923077) internal successors, (278), 65 states have internal predecessors, (278), 0 states have call successors, (0), 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 08:45:17,712 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 08:45:17,713 INFO L93 Difference]: Finished difference Result 19193 states and 23231 transitions. [2023-12-02 08:45:17,713 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2023-12-02 08:45:17,713 INFO L78 Accepts]: Start accepts. Automaton has has 66 states, 65 states have (on average 4.276923076923077) internal successors, (278), 65 states have internal predecessors, (278), 0 states have call successors, (0), 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 113 [2023-12-02 08:45:17,713 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 08:45:17,726 INFO L225 Difference]: With dead ends: 19193 [2023-12-02 08:45:17,726 INFO L226 Difference]: Without dead ends: 19193 [2023-12-02 08:45:17,727 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 398 GetRequests, 279 SyntacticMatches, 14 SemanticMatches, 105 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2765 ImplicationChecksByTransitivity, 5.0s TimeCoverageRelationStatistics Valid=1391, Invalid=9951, Unknown=0, NotChecked=0, Total=11342 [2023-12-02 08:45:17,727 INFO L413 NwaCegarLoop]: 57 mSDtfsCounter, 490 mSDsluCounter, 1107 mSDsCounter, 0 mSdLazyCounter, 1712 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 490 SdHoareTripleChecker+Valid, 1164 SdHoareTripleChecker+Invalid, 1712 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 1712 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2023-12-02 08:45:17,727 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [490 Valid, 1164 Invalid, 1712 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 1712 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2023-12-02 08:45:17,736 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19193 states. [2023-12-02 08:45:17,883 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19193 to 18532. [2023-12-02 08:45:17,893 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 18532 states, 18530 states have (on average 1.2104695089044792) internal successors, (22430), 18531 states have internal predecessors, (22430), 0 states have call successors, (0), 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 08:45:17,911 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18532 states to 18532 states and 22430 transitions. [2023-12-02 08:45:17,911 INFO L78 Accepts]: Start accepts. Automaton has 18532 states and 22430 transitions. Word has length 113 [2023-12-02 08:45:17,912 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 08:45:17,912 INFO L495 AbstractCegarLoop]: Abstraction has 18532 states and 22430 transitions. [2023-12-02 08:45:17,912 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 66 states, 65 states have (on average 4.276923076923077) internal successors, (278), 65 states have internal predecessors, (278), 0 states have call successors, (0), 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 08:45:17,912 INFO L276 IsEmpty]: Start isEmpty. Operand 18532 states and 22430 transitions. [2023-12-02 08:45:17,917 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 116 [2023-12-02 08:45:17,917 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 08:45:17,918 INFO L195 NwaCegarLoop]: trace histogram [19, 18, 18, 18, 17, 17, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 08:45:17,924 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (64)] Ended with exit code 0 [2023-12-02 08:45:18,118 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable75,64 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 08:45:18,118 INFO L420 AbstractCegarLoop]: === Iteration 77 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 10 more)] === [2023-12-02 08:45:18,119 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 08:45:18,119 INFO L85 PathProgramCache]: Analyzing trace with hash -1798439129, now seen corresponding path program 33 times [2023-12-02 08:45:18,119 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 08:45:18,119 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [996434638] [2023-12-02 08:45:18,119 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 08:45:18,119 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 08:45:18,151 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 08:45:19,797 INFO L134 CoverageAnalysis]: Checked inductivity of 937 backedges. 53 proven. 884 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 08:45:19,797 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 08:45:19,797 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [996434638] [2023-12-02 08:45:19,797 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [996434638] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 08:45:19,797 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1355908068] [2023-12-02 08:45:19,797 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-12-02 08:45:19,798 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 08:45:19,798 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 08:45:19,798 INFO L229 MonitoredProcess]: Starting monitored process 65 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 08:45:19,799 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (65)] Waiting until timeout for monitored process [2023-12-02 08:45:20,385 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-12-02 08:45:20,385 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 08:45:20,391 INFO L262 TraceCheckSpWp]: Trace formula consists of 656 conjuncts, 198 conjunts are in the unsatisfiable core [2023-12-02 08:45:20,394 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 08:45:21,027 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2023-12-02 08:45:21,203 INFO L134 CoverageAnalysis]: Checked inductivity of 937 backedges. 53 proven. 884 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 08:45:21,204 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 08:45:21,301 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 13 [2023-12-02 08:45:21,302 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2023-12-02 08:45:21,426 INFO L134 CoverageAnalysis]: Checked inductivity of 937 backedges. 53 proven. 884 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 08:45:21,426 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1355908068] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 08:45:21,426 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1544855809] [2023-12-02 08:45:21,427 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2023-12-02 08:45:21,427 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 08:45:21,427 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 08:45:21,427 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 08:45:21,428 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 08:45:22,037 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 08:45:24,408 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1016490#(and (<= 2 |ULTIMATE.start_cstrspn_~s2#1.base|) (= |ULTIMATE.start_cstrspn_#in~s2#1.offset| 0) (<= 2 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |ULTIMATE.start_main_#t~malloc8#1.offset| 0) (<= 0 |ULTIMATE.start_cstrspn_#t~post4#1.offset|) (<= 1 |#StackHeapBarrier|) (= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (= |ULTIMATE.start_main_~length1~0#1| 1) (= |ULTIMATE.start_cstrspn_~p~0#1.offset| 1) (= |ULTIMATE.start_cstrspn_~spanp~0#1.base| |ULTIMATE.start_cstrspn_#t~post4#1.base|) (<= 2 |ULTIMATE.start_main_#t~malloc9#1.base|) (<= 2 |ULTIMATE.start_cstrspn_#in~s1#1.base|) (= |ULTIMATE.start_cstrspn_#in~s1#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc9#1.offset| 0) (= 0 |ULTIMATE.start_cstrspn_~s2#1.offset|) (= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 2 |ULTIMATE.start_cstrspn_~p~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 2 |ULTIMATE.start_main_#t~malloc8#1.base|) (<= 2 |ULTIMATE.start_cstrspn_#in~s2#1.base|) (<= (select |#length| |ULTIMATE.start_cstrspn_#t~post4#1.base|) |ULTIMATE.start_cstrspn_#t~post4#1.offset|) (<= 2 |ULTIMATE.start_cstrspn_~s1#1.base|) (<= 2 |ULTIMATE.start_main_~nondetString1~0#1.base|) (= |ULTIMATE.start_cstrspn_~s1#1.offset| 0) (= (+ |ULTIMATE.start_cstrspn_#t~post4#1.offset| 1) |ULTIMATE.start_cstrspn_~spanp~0#1.offset|) (<= 2 |ULTIMATE.start_cstrspn_#t~post4#1.base|))' at error location [2023-12-02 08:45:24,408 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 08:45:24,408 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 08:45:24,409 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [44, 43, 43] total 69 [2023-12-02 08:45:24,409 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1151074519] [2023-12-02 08:45:24,409 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 08:45:24,409 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 69 states [2023-12-02 08:45:24,409 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 08:45:24,409 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 69 interpolants. [2023-12-02 08:45:24,410 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=245, Invalid=6232, Unknown=3, NotChecked=0, Total=6480 [2023-12-02 08:45:24,410 INFO L87 Difference]: Start difference. First operand 18532 states and 22430 transitions. Second operand has 69 states, 69 states have (on average 2.3333333333333335) internal successors, (161), 69 states have internal predecessors, (161), 0 states have call successors, (0), 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 08:45:29,662 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 08:45:29,662 INFO L93 Difference]: Finished difference Result 22607 states and 27110 transitions. [2023-12-02 08:45:29,663 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 62 states. [2023-12-02 08:45:29,663 INFO L78 Accepts]: Start accepts. Automaton has has 69 states, 69 states have (on average 2.3333333333333335) internal successors, (161), 69 states have internal predecessors, (161), 0 states have call successors, (0), 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 115 [2023-12-02 08:45:29,663 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 08:45:29,682 INFO L225 Difference]: With dead ends: 22607 [2023-12-02 08:45:29,682 INFO L226 Difference]: Without dead ends: 21255 [2023-12-02 08:45:29,683 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 427 GetRequests, 308 SyntacticMatches, 0 SemanticMatches, 119 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2720 ImplicationChecksByTransitivity, 6.0s TimeCoverageRelationStatistics Valid=643, Invalid=13874, Unknown=3, NotChecked=0, Total=14520 [2023-12-02 08:45:29,683 INFO L413 NwaCegarLoop]: 96 mSDtfsCounter, 505 mSDsluCounter, 4472 mSDsCounter, 0 mSdLazyCounter, 5739 mSolverCounterSat, 17 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 505 SdHoareTripleChecker+Valid, 4568 SdHoareTripleChecker+Invalid, 5756 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 17 IncrementalHoareTripleChecker+Valid, 5739 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.8s IncrementalHoareTripleChecker+Time [2023-12-02 08:45:29,683 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [505 Valid, 4568 Invalid, 5756 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [17 Valid, 5739 Invalid, 0 Unknown, 0 Unchecked, 2.8s Time] [2023-12-02 08:45:29,696 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21255 states. [2023-12-02 08:45:29,860 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21255 to 20392. [2023-12-02 08:45:29,873 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20392 states, 20390 states have (on average 1.2118195193722412) internal successors, (24709), 20391 states have internal predecessors, (24709), 0 states have call successors, (0), 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 08:45:29,901 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20392 states to 20392 states and 24709 transitions. [2023-12-02 08:45:29,901 INFO L78 Accepts]: Start accepts. Automaton has 20392 states and 24709 transitions. Word has length 115 [2023-12-02 08:45:29,901 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 08:45:29,901 INFO L495 AbstractCegarLoop]: Abstraction has 20392 states and 24709 transitions. [2023-12-02 08:45:29,901 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 69 states, 69 states have (on average 2.3333333333333335) internal successors, (161), 69 states have internal predecessors, (161), 0 states have call successors, (0), 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 08:45:29,901 INFO L276 IsEmpty]: Start isEmpty. Operand 20392 states and 24709 transitions. [2023-12-02 08:45:29,910 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 118 [2023-12-02 08:45:29,910 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 08:45:29,910 INFO L195 NwaCegarLoop]: trace histogram [14, 14, 14, 14, 13, 13, 12, 12, 2, 2, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 08:45:29,918 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (65)] Ended with exit code 0 [2023-12-02 08:45:30,110 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable76,65 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 08:45:30,111 INFO L420 AbstractCegarLoop]: === Iteration 78 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 10 more)] === [2023-12-02 08:45:30,111 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 08:45:30,111 INFO L85 PathProgramCache]: Analyzing trace with hash -922215158, now seen corresponding path program 7 times [2023-12-02 08:45:30,111 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 08:45:30,111 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1674735938] [2023-12-02 08:45:30,111 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 08:45:30,111 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 08:45:30,160 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 08:45:31,886 INFO L134 CoverageAnalysis]: Checked inductivity of 694 backedges. 26 proven. 661 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2023-12-02 08:45:31,886 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 08:45:31,886 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1674735938] [2023-12-02 08:45:31,886 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1674735938] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 08:45:31,886 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1348622417] [2023-12-02 08:45:31,887 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-12-02 08:45:31,887 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 08:45:31,887 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 08:45:31,888 INFO L229 MonitoredProcess]: Starting monitored process 66 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 08:45:31,888 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (66)] Waiting until timeout for monitored process [2023-12-02 08:45:32,179 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 08:45:32,184 INFO L262 TraceCheckSpWp]: Trace formula consists of 774 conjuncts, 155 conjunts are in the unsatisfiable core [2023-12-02 08:45:32,187 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 08:45:32,191 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2023-12-02 08:45:32,302 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 13 treesize of output 9 [2023-12-02 08:45:32,310 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 18 treesize of output 13 [2023-12-02 08:45:32,472 INFO L134 CoverageAnalysis]: Checked inductivity of 694 backedges. 27 proven. 660 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2023-12-02 08:45:32,472 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 08:45:32,682 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-12-02 08:45:32,683 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 23 treesize of output 24 [2023-12-02 08:45:32,688 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-12-02 08:45:32,689 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 37 treesize of output 32 [2023-12-02 08:45:32,875 INFO L134 CoverageAnalysis]: Checked inductivity of 694 backedges. 26 proven. 661 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2023-12-02 08:45:32,875 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1348622417] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 08:45:32,876 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1935017352] [2023-12-02 08:45:32,876 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2023-12-02 08:45:32,877 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 08:45:32,877 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 08:45:32,877 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 08:45:32,877 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 08:45:34,287 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 08:45:35,083 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1060317#(or (< (select |#length| |ULTIMATE.start_cstrspn_#t~post2#1.base|) (+ |ULTIMATE.start_cstrspn_#t~post2#1.offset| 1)) (< |ULTIMATE.start_cstrspn_#t~post2#1.offset| 0))' at error location [2023-12-02 08:45:35,084 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 08:45:35,084 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 08:45:35,084 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 33, 33] total 39 [2023-12-02 08:45:35,084 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [430014014] [2023-12-02 08:45:35,084 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 08:45:35,085 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 40 states [2023-12-02 08:45:35,085 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 08:45:35,085 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2023-12-02 08:45:35,085 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=117, Invalid=2324, Unknown=9, NotChecked=0, Total=2450 [2023-12-02 08:45:35,085 INFO L87 Difference]: Start difference. First operand 20392 states and 24709 transitions. Second operand has 40 states, 40 states have (on average 3.1) internal successors, (124), 39 states have internal predecessors, (124), 0 states have call successors, (0), 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 08:45:37,524 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 08:45:37,524 INFO L93 Difference]: Finished difference Result 21020 states and 25309 transitions. [2023-12-02 08:45:37,524 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 60 states. [2023-12-02 08:45:37,525 INFO L78 Accepts]: Start accepts. Automaton has has 40 states, 40 states have (on average 3.1) internal successors, (124), 39 states have internal predecessors, (124), 0 states have call successors, (0), 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 117 [2023-12-02 08:45:37,525 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 08:45:37,533 INFO L225 Difference]: With dead ends: 21020 [2023-12-02 08:45:37,533 INFO L226 Difference]: Without dead ends: 12668 [2023-12-02 08:45:37,534 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 424 GetRequests, 335 SyntacticMatches, 0 SemanticMatches, 89 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1128 ImplicationChecksByTransitivity, 2.9s TimeCoverageRelationStatistics Valid=458, Invalid=7723, Unknown=9, NotChecked=0, Total=8190 [2023-12-02 08:45:37,534 INFO L413 NwaCegarLoop]: 85 mSDtfsCounter, 448 mSDsluCounter, 2386 mSDsCounter, 0 mSdLazyCounter, 3252 mSolverCounterSat, 16 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 448 SdHoareTripleChecker+Valid, 2471 SdHoareTripleChecker+Invalid, 3268 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 16 IncrementalHoareTripleChecker+Valid, 3252 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.2s IncrementalHoareTripleChecker+Time [2023-12-02 08:45:37,534 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [448 Valid, 2471 Invalid, 3268 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [16 Valid, 3252 Invalid, 0 Unknown, 0 Unchecked, 1.2s Time] [2023-12-02 08:45:37,539 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12668 states. [2023-12-02 08:45:37,614 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12668 to 11742. [2023-12-02 08:45:37,620 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 11742 states, 11740 states have (on average 1.209710391822828) internal successors, (14202), 11741 states have internal predecessors, (14202), 0 states have call successors, (0), 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 08:45:37,631 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11742 states to 11742 states and 14202 transitions. [2023-12-02 08:45:37,631 INFO L78 Accepts]: Start accepts. Automaton has 11742 states and 14202 transitions. Word has length 117 [2023-12-02 08:45:37,631 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 08:45:37,632 INFO L495 AbstractCegarLoop]: Abstraction has 11742 states and 14202 transitions. [2023-12-02 08:45:37,632 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 40 states, 40 states have (on average 3.1) internal successors, (124), 39 states have internal predecessors, (124), 0 states have call successors, (0), 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 08:45:37,632 INFO L276 IsEmpty]: Start isEmpty. Operand 11742 states and 14202 transitions. [2023-12-02 08:45:37,635 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 118 [2023-12-02 08:45:37,636 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 08:45:37,636 INFO L195 NwaCegarLoop]: trace histogram [19, 18, 18, 18, 18, 18, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 08:45:37,641 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (66)] Ended with exit code 0 [2023-12-02 08:45:37,836 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable77,66 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 08:45:37,836 INFO L420 AbstractCegarLoop]: === Iteration 79 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 10 more)] === [2023-12-02 08:45:37,836 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 08:45:37,836 INFO L85 PathProgramCache]: Analyzing trace with hash -1139565012, now seen corresponding path program 34 times [2023-12-02 08:45:37,837 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 08:45:37,837 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1437534432] [2023-12-02 08:45:37,837 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 08:45:37,837 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 08:45:37,884 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 08:45:39,543 INFO L134 CoverageAnalysis]: Checked inductivity of 972 backedges. 256 proven. 716 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 08:45:39,543 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 08:45:39,543 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1437534432] [2023-12-02 08:45:39,544 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1437534432] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 08:45:39,544 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [721127590] [2023-12-02 08:45:39,544 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-12-02 08:45:39,544 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 08:45:39,544 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 08:45:39,545 INFO L229 MonitoredProcess]: Starting monitored process 67 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 08:45:39,545 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (67)] Waiting until timeout for monitored process [2023-12-02 08:45:39,812 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 08:45:39,818 INFO L262 TraceCheckSpWp]: Trace formula consists of 669 conjuncts, 180 conjunts are in the unsatisfiable core [2023-12-02 08:45:39,821 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 08:45:41,127 INFO L134 CoverageAnalysis]: Checked inductivity of 972 backedges. 289 proven. 683 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 08:45:41,127 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 08:45:42,952 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 5 treesize of output 3 [2023-12-02 08:45:43,791 INFO L134 CoverageAnalysis]: Checked inductivity of 972 backedges. 289 proven. 683 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 08:45:43,792 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [721127590] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 08:45:43,792 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [701190300] [2023-12-02 08:45:43,793 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2023-12-02 08:45:43,793 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 08:45:43,793 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 08:45:43,794 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 08:45:43,794 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 08:45:44,496 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 08:45:47,288 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1093955#(and (<= 2 |ULTIMATE.start_cstrspn_~s2#1.base|) (= |ULTIMATE.start_cstrspn_#in~s2#1.offset| 0) (<= 2 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |ULTIMATE.start_main_#t~malloc8#1.offset| 0) (<= 0 |ULTIMATE.start_cstrspn_#t~post4#1.offset|) (<= 1 |#StackHeapBarrier|) (= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (= |ULTIMATE.start_main_~length1~0#1| 1) (= |ULTIMATE.start_cstrspn_~p~0#1.offset| 1) (= |ULTIMATE.start_cstrspn_~spanp~0#1.base| |ULTIMATE.start_cstrspn_#t~post4#1.base|) (<= 2 |ULTIMATE.start_main_#t~malloc9#1.base|) (<= 2 |ULTIMATE.start_cstrspn_#in~s1#1.base|) (= |ULTIMATE.start_cstrspn_#in~s1#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc9#1.offset| 0) (= 0 |ULTIMATE.start_cstrspn_~s2#1.offset|) (= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 2 |ULTIMATE.start_cstrspn_~p~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 2 |ULTIMATE.start_main_#t~malloc8#1.base|) (<= 2 |ULTIMATE.start_cstrspn_#in~s2#1.base|) (<= (select |#length| |ULTIMATE.start_cstrspn_#t~post4#1.base|) |ULTIMATE.start_cstrspn_#t~post4#1.offset|) (<= 2 |ULTIMATE.start_cstrspn_~s1#1.base|) (<= 2 |ULTIMATE.start_main_~nondetString1~0#1.base|) (= |ULTIMATE.start_cstrspn_~s1#1.offset| 0) (= (+ |ULTIMATE.start_cstrspn_#t~post4#1.offset| 1) |ULTIMATE.start_cstrspn_~spanp~0#1.offset|) (<= 2 |ULTIMATE.start_cstrspn_#t~post4#1.base|))' at error location [2023-12-02 08:45:47,288 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 08:45:47,288 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 08:45:47,289 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [42, 42, 42] total 87 [2023-12-02 08:45:47,289 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1521463794] [2023-12-02 08:45:47,289 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 08:45:47,289 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 88 states [2023-12-02 08:45:47,289 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 08:45:47,290 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 88 interpolants. [2023-12-02 08:45:47,290 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=929, Invalid=8969, Unknown=2, NotChecked=0, Total=9900 [2023-12-02 08:45:47,290 INFO L87 Difference]: Start difference. First operand 11742 states and 14202 transitions. Second operand has 88 states, 87 states have (on average 2.7471264367816093) internal successors, (239), 88 states have internal predecessors, (239), 0 states have call successors, (0), 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 08:45:50,879 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 08:45:50,879 INFO L93 Difference]: Finished difference Result 12832 states and 15317 transitions. [2023-12-02 08:45:50,880 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 64 states. [2023-12-02 08:45:50,880 INFO L78 Accepts]: Start accepts. Automaton has has 88 states, 87 states have (on average 2.7471264367816093) internal successors, (239), 88 states have internal predecessors, (239), 0 states have call successors, (0), 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 117 [2023-12-02 08:45:50,880 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 08:45:50,887 INFO L225 Difference]: With dead ends: 12832 [2023-12-02 08:45:50,887 INFO L226 Difference]: Without dead ends: 12832 [2023-12-02 08:45:50,888 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 433 GetRequests, 274 SyntacticMatches, 19 SemanticMatches, 140 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7639 ImplicationChecksByTransitivity, 8.2s TimeCoverageRelationStatistics Valid=1815, Invalid=18205, Unknown=2, NotChecked=0, Total=20022 [2023-12-02 08:45:50,889 INFO L413 NwaCegarLoop]: 83 mSDtfsCounter, 889 mSDsluCounter, 2175 mSDsCounter, 0 mSdLazyCounter, 3870 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 889 SdHoareTripleChecker+Valid, 2258 SdHoareTripleChecker+Invalid, 3871 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 3870 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.7s IncrementalHoareTripleChecker+Time [2023-12-02 08:45:50,889 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [889 Valid, 2258 Invalid, 3871 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 3870 Invalid, 0 Unknown, 0 Unchecked, 1.7s Time] [2023-12-02 08:45:50,895 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12832 states. [2023-12-02 08:45:50,977 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12832 to 11850. [2023-12-02 08:45:50,983 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 11850 states, 11848 states have (on average 1.2099932478055369) internal successors, (14336), 11849 states have internal predecessors, (14336), 0 states have call successors, (0), 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 08:45:50,994 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11850 states to 11850 states and 14336 transitions. [2023-12-02 08:45:50,994 INFO L78 Accepts]: Start accepts. Automaton has 11850 states and 14336 transitions. Word has length 117 [2023-12-02 08:45:50,994 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 08:45:50,994 INFO L495 AbstractCegarLoop]: Abstraction has 11850 states and 14336 transitions. [2023-12-02 08:45:50,994 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 88 states, 87 states have (on average 2.7471264367816093) internal successors, (239), 88 states have internal predecessors, (239), 0 states have call successors, (0), 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 08:45:50,995 INFO L276 IsEmpty]: Start isEmpty. Operand 11850 states and 14336 transitions. [2023-12-02 08:45:50,998 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 120 [2023-12-02 08:45:50,998 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 08:45:50,998 INFO L195 NwaCegarLoop]: trace histogram [15, 14, 14, 14, 14, 14, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 08:45:51,004 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (67)] Ended with exit code 0 [2023-12-02 08:45:51,199 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable78,67 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 08:45:51,199 INFO L420 AbstractCegarLoop]: === Iteration 80 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 10 more)] === [2023-12-02 08:45:51,199 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 08:45:51,199 INFO L85 PathProgramCache]: Analyzing trace with hash 906942485, now seen corresponding path program 24 times [2023-12-02 08:45:51,199 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 08:45:51,199 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1511233114] [2023-12-02 08:45:51,199 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 08:45:51,199 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 08:45:51,238 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 08:45:53,761 INFO L134 CoverageAnalysis]: Checked inductivity of 744 backedges. 121 proven. 622 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 08:45:53,761 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 08:45:53,761 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1511233114] [2023-12-02 08:45:53,761 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1511233114] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 08:45:53,761 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1497254770] [2023-12-02 08:45:53,761 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-12-02 08:45:53,761 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 08:45:53,761 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 08:45:53,762 INFO L229 MonitoredProcess]: Starting monitored process 68 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 08:45:53,763 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (68)] Waiting until timeout for monitored process [2023-12-02 08:45:54,417 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-12-02 08:45:54,417 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 08:45:54,424 INFO L262 TraceCheckSpWp]: Trace formula consists of 793 conjuncts, 199 conjunts are in the unsatisfiable core [2023-12-02 08:45:54,428 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 08:45:54,435 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2023-12-02 08:45:55,424 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 14 treesize of output 10 [2023-12-02 08:45:55,592 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 30 treesize of output 14 [2023-12-02 08:46:00,721 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-12-02 08:46:00,722 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 3 new quantified variables, introduced 1 case distinctions, treesize of input 35 treesize of output 22 [2023-12-02 08:46:00,890 INFO L134 CoverageAnalysis]: Checked inductivity of 744 backedges. 144 proven. 599 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 08:46:00,890 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 08:46:04,110 INFO L349 Elim1Store]: treesize reduction 14, result has 65.9 percent of original size [2023-12-02 08:46:04,110 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 193 treesize of output 158 [2023-12-02 08:46:04,117 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-12-02 08:46:04,117 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 130 treesize of output 126 [2023-12-02 08:46:04,181 INFO L173 IndexEqualityManager]: detected equality via solver [2023-12-02 08:46:04,182 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 0 case distinctions, treesize of input 26 treesize of output 17 [2023-12-02 08:46:04,196 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-12-02 08:46:04,197 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 105 treesize of output 116 [2023-12-02 08:46:04,428 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2023-12-02 08:46:05,955 INFO L134 CoverageAnalysis]: Checked inductivity of 744 backedges. 144 proven. 599 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 08:46:05,956 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1497254770] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 08:46:05,956 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2074958183] [2023-12-02 08:46:05,956 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2023-12-02 08:46:05,956 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 08:46:05,957 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 08:46:05,957 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 08:46:05,957 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 08:46:07,110 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 08:46:10,770 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1119559#(and (<= 0 |ULTIMATE.start_cstrspn_#t~post2#1.offset|) (or (and (= |ULTIMATE.start_cstrspn_#in~s2#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc8#1.offset| 0) (= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (= |ULTIMATE.start_cstrspn_#in~s1#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc9#1.offset| 0) (= 0 |ULTIMATE.start_cstrspn_~s2#1.offset|) (= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (= |ULTIMATE.start_cstrspn_~s1#1.offset| 0) (= |ULTIMATE.start_cstrspn_~spanp~0#1.offset| 1)) (and (= |ULTIMATE.start_cstrspn_#in~s2#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc8#1.offset| 0) (= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (= |ULTIMATE.start_cstrspn_~p~0#1.offset| 1) (= |ULTIMATE.start_cstrspn_#in~s1#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc9#1.offset| 0) (= 0 |ULTIMATE.start_cstrspn_~s2#1.offset|) (= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (= |ULTIMATE.start_cstrspn_~s1#1.offset| 0) (= |ULTIMATE.start_cstrspn_#t~post2#1.offset| 0))) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 1 |ULTIMATE.start_cstrspn_~p~0#1.offset|) (<= (select |#length| |ULTIMATE.start_cstrspn_#t~post2#1.base|) |ULTIMATE.start_cstrspn_#t~post2#1.offset|))' at error location [2023-12-02 08:46:10,770 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 08:46:10,770 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 08:46:10,770 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [40, 39, 39] total 116 [2023-12-02 08:46:10,770 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1969336962] [2023-12-02 08:46:10,770 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 08:46:10,771 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 118 states [2023-12-02 08:46:10,771 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 08:46:10,771 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 118 interpolants. [2023-12-02 08:46:10,772 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1282, Invalid=15748, Unknown=0, NotChecked=0, Total=17030 [2023-12-02 08:46:10,772 INFO L87 Difference]: Start difference. First operand 11850 states and 14336 transitions. Second operand has 118 states, 117 states have (on average 3.034188034188034) internal successors, (355), 117 states have internal predecessors, (355), 0 states have call successors, (0), 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 08:46:26,475 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-12-02 08:46:29,066 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 08:46:29,066 INFO L93 Difference]: Finished difference Result 12023 states and 14512 transitions. [2023-12-02 08:46:29,066 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 58 states. [2023-12-02 08:46:29,066 INFO L78 Accepts]: Start accepts. Automaton has has 118 states, 117 states have (on average 3.034188034188034) internal successors, (355), 117 states have internal predecessors, (355), 0 states have call successors, (0), 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 119 [2023-12-02 08:46:29,067 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 08:46:29,075 INFO L225 Difference]: With dead ends: 12023 [2023-12-02 08:46:29,076 INFO L226 Difference]: Without dead ends: 12023 [2023-12-02 08:46:29,077 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 450 GetRequests, 266 SyntacticMatches, 0 SemanticMatches, 184 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9816 ImplicationChecksByTransitivity, 22.7s TimeCoverageRelationStatistics Valid=2690, Invalid=31718, Unknown=2, NotChecked=0, Total=34410 [2023-12-02 08:46:29,078 INFO L413 NwaCegarLoop]: 56 mSDtfsCounter, 837 mSDsluCounter, 1857 mSDsCounter, 0 mSdLazyCounter, 5066 mSolverCounterSat, 3 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 7.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 837 SdHoareTripleChecker+Valid, 1913 SdHoareTripleChecker+Invalid, 5071 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 5066 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 8.2s IncrementalHoareTripleChecker+Time [2023-12-02 08:46:29,078 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [837 Valid, 1913 Invalid, 5071 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 5066 Invalid, 2 Unknown, 0 Unchecked, 8.2s Time] [2023-12-02 08:46:29,084 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12023 states. [2023-12-02 08:46:29,183 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12023 to 11958. [2023-12-02 08:46:29,191 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 11958 states, 11956 states have (on average 1.2095182335229173) internal successors, (14461), 11957 states have internal predecessors, (14461), 0 states have call successors, (0), 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 08:46:29,205 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11958 states to 11958 states and 14461 transitions. [2023-12-02 08:46:29,205 INFO L78 Accepts]: Start accepts. Automaton has 11958 states and 14461 transitions. Word has length 119 [2023-12-02 08:46:29,206 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 08:46:29,206 INFO L495 AbstractCegarLoop]: Abstraction has 11958 states and 14461 transitions. [2023-12-02 08:46:29,206 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 118 states, 117 states have (on average 3.034188034188034) internal successors, (355), 117 states have internal predecessors, (355), 0 states have call successors, (0), 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 08:46:29,206 INFO L276 IsEmpty]: Start isEmpty. Operand 11958 states and 14461 transitions. [2023-12-02 08:46:29,211 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 122 [2023-12-02 08:46:29,211 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 08:46:29,212 INFO L195 NwaCegarLoop]: trace histogram [20, 19, 19, 19, 18, 18, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 08:46:29,219 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (68)] Ended with exit code 0 [2023-12-02 08:46:29,412 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 68 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable79 [2023-12-02 08:46:29,412 INFO L420 AbstractCegarLoop]: === Iteration 81 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 10 more)] === [2023-12-02 08:46:29,412 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 08:46:29,413 INFO L85 PathProgramCache]: Analyzing trace with hash 825194288, now seen corresponding path program 35 times [2023-12-02 08:46:29,413 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 08:46:29,413 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [540216640] [2023-12-02 08:46:29,413 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 08:46:29,413 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 08:46:29,458 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 08:46:31,906 INFO L134 CoverageAnalysis]: Checked inductivity of 1046 backedges. 56 proven. 990 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 08:46:31,907 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 08:46:31,907 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [540216640] [2023-12-02 08:46:31,907 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [540216640] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 08:46:31,907 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1937792121] [2023-12-02 08:46:31,907 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-12-02 08:46:31,907 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 08:46:31,907 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 08:46:31,908 INFO L229 MonitoredProcess]: Starting monitored process 69 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 08:46:31,909 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b1b50e5-c053-40e8-9319-0a537f00247e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (69)] Waiting until timeout for monitored process [2023-12-02 08:46:33,652 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 20 check-sat command(s) [2023-12-02 08:46:33,652 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 08:46:33,662 INFO L262 TraceCheckSpWp]: Trace formula consists of 687 conjuncts, 137 conjunts are in the unsatisfiable core [2023-12-02 08:46:33,666 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 08:46:33,683 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2023-12-02 08:46:33,691 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 1 [2023-12-02 08:46:34,583 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 14 treesize of output 10 [2023-12-02 08:46:34,754 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 28 treesize of output 27 [2023-12-02 08:46:37,699 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-12-02 08:46:37,699 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 3 new quantified variables, introduced 1 case distinctions, treesize of input 30 treesize of output 23 [2023-12-02 08:46:37,965 INFO L134 CoverageAnalysis]: Checked inductivity of 1046 backedges. 18 proven. 92 refuted. 0 times theorem prover too weak. 936 trivial. 0 not checked. [2023-12-02 08:46:37,965 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 08:46:38,755 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-12-02 08:46:38,756 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 28 treesize of output 29 [2023-12-02 08:46:38,762 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-12-02 08:46:38,762 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 29 treesize of output 33 [2023-12-02 08:46:38,768 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 20 [2023-12-02 08:46:38,782 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-12-02 08:46:38,782 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 48 treesize of output 49 [2023-12-02 08:46:40,183 INFO L134 CoverageAnalysis]: Checked inductivity of 1046 backedges. 18 proven. 92 refuted. 0 times theorem prover too weak. 936 trivial. 0 not checked. [2023-12-02 08:46:40,183 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1937792121] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 08:46:40,183 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1557555457] [2023-12-02 08:46:40,184 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2023-12-02 08:46:40,184 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 08:46:40,184 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 08:46:40,184 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 08:46:40,184 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 08:46:40,773 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 08:46:43,494 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1144452#(and (<= 2 |ULTIMATE.start_cstrspn_~s2#1.base|) (= |ULTIMATE.start_cstrspn_#in~s2#1.offset| 0) (<= 2 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |ULTIMATE.start_main_#t~malloc8#1.offset| 0) (<= 0 |ULTIMATE.start_cstrspn_#t~post4#1.offset|) (<= 1 |#StackHeapBarrier|) (= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (= |ULTIMATE.start_main_~length1~0#1| 1) (= |ULTIMATE.start_cstrspn_~p~0#1.offset| 1) (= |ULTIMATE.start_cstrspn_~spanp~0#1.base| |ULTIMATE.start_cstrspn_#t~post4#1.base|) (<= 2 |ULTIMATE.start_main_#t~malloc9#1.base|) (<= 2 |ULTIMATE.start_cstrspn_#in~s1#1.base|) (= |ULTIMATE.start_cstrspn_#in~s1#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc9#1.offset| 0) (= 0 |ULTIMATE.start_cstrspn_~s2#1.offset|) (= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 2 |ULTIMATE.start_cstrspn_~p~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 2 |ULTIMATE.start_main_#t~malloc8#1.base|) (<= 2 |ULTIMATE.start_cstrspn_#in~s2#1.base|) (<= (select |#length| |ULTIMATE.start_cstrspn_#t~post4#1.base|) |ULTIMATE.start_cstrspn_#t~post4#1.offset|) (<= 2 |ULTIMATE.start_cstrspn_~s1#1.base|) (<= 2 |ULTIMATE.start_main_~nondetString1~0#1.base|) (= |ULTIMATE.start_cstrspn_~s1#1.offset| 0) (= (+ |ULTIMATE.start_cstrspn_#t~post4#1.offset| 1) |ULTIMATE.start_cstrspn_~spanp~0#1.offset|) (<= 2 |ULTIMATE.start_cstrspn_#t~post4#1.base|))' at error location [2023-12-02 08:46:43,494 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 08:46:43,494 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 08:46:43,494 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [46, 11, 11] total 68 [2023-12-02 08:46:43,494 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1667648930] [2023-12-02 08:46:43,495 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 08:46:43,495 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 69 states [2023-12-02 08:46:43,495 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 08:46:43,495 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 69 interpolants. [2023-12-02 08:46:43,496 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=248, Invalid=6229, Unknown=3, NotChecked=0, Total=6480 [2023-12-02 08:46:43,496 INFO L87 Difference]: Start difference. First operand 11958 states and 14461 transitions. Second operand has 69 states, 69 states have (on average 2.3333333333333335) internal successors, (161), 68 states have internal predecessors, (161), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0)