./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/array-fpi/sina2.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version e7bb482b Calling Ultimate with: /usr/lib/jvm/java-11-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa1c05b6-7b42-4263-a52b-d676050797ad/bin/utaipan-verify-FOvIYxoinp/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa1c05b6-7b42-4263-a52b-d676050797ad/bin/utaipan-verify-FOvIYxoinp/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa1c05b6-7b42-4263-a52b-d676050797ad/bin/utaipan-verify-FOvIYxoinp/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa1c05b6-7b42-4263-a52b-d676050797ad/bin/utaipan-verify-FOvIYxoinp/config/TaipanReach.xml -i ../../sv-benchmarks/c/array-fpi/sina2.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa1c05b6-7b42-4263-a52b-d676050797ad/bin/utaipan-verify-FOvIYxoinp/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa1c05b6-7b42-4263-a52b-d676050797ad/bin/utaipan-verify-FOvIYxoinp --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(reach_error())) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 1ea1eb4a8af9eb0da04a9f2b25d1b98ecd98ff3b6d87ba0d8e53000f12b8adcc --- Real Ultimate output --- This is Ultimate 0.2.3-dev-e7bb482 [2023-11-06 20:57:37,723 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-11-06 20:57:37,834 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa1c05b6-7b42-4263-a52b-d676050797ad/bin/utaipan-verify-FOvIYxoinp/config/svcomp-Reach-32bit-Taipan_Default.epf [2023-11-06 20:57:37,845 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-11-06 20:57:37,846 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-11-06 20:57:37,886 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-11-06 20:57:37,887 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-11-06 20:57:37,888 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-11-06 20:57:37,889 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-11-06 20:57:37,894 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-11-06 20:57:37,894 INFO L153 SettingsManager]: * User list type=DISABLED [2023-11-06 20:57:37,895 INFO L151 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-11-06 20:57:37,896 INFO L153 SettingsManager]: * Explicit value domain=true [2023-11-06 20:57:37,898 INFO L153 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-11-06 20:57:37,898 INFO L153 SettingsManager]: * Octagon Domain=false [2023-11-06 20:57:37,898 INFO L153 SettingsManager]: * Abstract domain=CompoundDomain [2023-11-06 20:57:37,899 INFO L153 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-11-06 20:57:37,899 INFO L153 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-11-06 20:57:37,900 INFO L153 SettingsManager]: * Interval Domain=false [2023-11-06 20:57:37,900 INFO L151 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-11-06 20:57:37,900 INFO L153 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-11-06 20:57:37,901 INFO L153 SettingsManager]: * Simplification Technique=POLY_PAC [2023-11-06 20:57:37,902 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-11-06 20:57:37,903 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-11-06 20:57:37,903 INFO L153 SettingsManager]: * sizeof long=4 [2023-11-06 20:57:37,904 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-11-06 20:57:37,904 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-11-06 20:57:37,904 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-11-06 20:57:37,905 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-11-06 20:57:37,905 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-11-06 20:57:37,906 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-11-06 20:57:37,907 INFO L153 SettingsManager]: * sizeof long double=12 [2023-11-06 20:57:37,907 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2023-11-06 20:57:37,907 INFO L153 SettingsManager]: * Use constant arrays=true [2023-11-06 20:57:37,907 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-11-06 20:57:37,908 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-11-06 20:57:37,908 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-06 20:57:37,908 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-11-06 20:57:37,908 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-11-06 20:57:37,908 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2023-11-06 20:57:37,909 INFO L153 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-11-06 20:57:37,909 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-11-06 20:57:37,909 INFO L153 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-11-06 20:57:37,909 INFO L153 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-11-06 20:57:37,910 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-11-06 20:57:37,910 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_aa1c05b6-7b42-4263-a52b-d676050797ad/bin/utaipan-verify-FOvIYxoinp/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa1c05b6-7b42-4263-a52b-d676050797ad/bin/utaipan-verify-FOvIYxoinp Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 1ea1eb4a8af9eb0da04a9f2b25d1b98ecd98ff3b6d87ba0d8e53000f12b8adcc [2023-11-06 20:57:38,235 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-11-06 20:57:38,268 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-11-06 20:57:38,271 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-11-06 20:57:38,272 INFO L270 PluginConnector]: Initializing CDTParser... [2023-11-06 20:57:38,273 INFO L274 PluginConnector]: CDTParser initialized [2023-11-06 20:57:38,275 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa1c05b6-7b42-4263-a52b-d676050797ad/bin/utaipan-verify-FOvIYxoinp/../../sv-benchmarks/c/array-fpi/sina2.c [2023-11-06 20:57:41,415 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-11-06 20:57:41,629 INFO L384 CDTParser]: Found 1 translation units. [2023-11-06 20:57:41,630 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa1c05b6-7b42-4263-a52b-d676050797ad/sv-benchmarks/c/array-fpi/sina2.c [2023-11-06 20:57:41,638 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa1c05b6-7b42-4263-a52b-d676050797ad/bin/utaipan-verify-FOvIYxoinp/data/76c962198/dbed6c7032bf4d3cbda7bdc55c83e659/FLAGb75e46773 [2023-11-06 20:57:41,654 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa1c05b6-7b42-4263-a52b-d676050797ad/bin/utaipan-verify-FOvIYxoinp/data/76c962198/dbed6c7032bf4d3cbda7bdc55c83e659 [2023-11-06 20:57:41,657 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-11-06 20:57:41,659 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-11-06 20:57:41,661 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-11-06 20:57:41,661 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-11-06 20:57:41,667 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-11-06 20:57:41,668 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.11 08:57:41" (1/1) ... [2023-11-06 20:57:41,670 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@264bde5 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 08:57:41, skipping insertion in model container [2023-11-06 20:57:41,670 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.11 08:57:41" (1/1) ... [2023-11-06 20:57:41,694 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-11-06 20:57:41,876 WARN L240 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa1c05b6-7b42-4263-a52b-d676050797ad/sv-benchmarks/c/array-fpi/sina2.c[588,601] [2023-11-06 20:57:41,900 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-06 20:57:41,909 INFO L202 MainTranslator]: Completed pre-run [2023-11-06 20:57:41,924 WARN L240 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa1c05b6-7b42-4263-a52b-d676050797ad/sv-benchmarks/c/array-fpi/sina2.c[588,601] [2023-11-06 20:57:41,934 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-06 20:57:41,957 INFO L206 MainTranslator]: Completed translation [2023-11-06 20:57:41,958 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 08:57:41 WrapperNode [2023-11-06 20:57:41,958 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-11-06 20:57:41,960 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-11-06 20:57:41,960 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-11-06 20:57:41,960 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-11-06 20:57:41,969 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 08:57:41" (1/1) ... [2023-11-06 20:57:41,977 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 08:57:41" (1/1) ... [2023-11-06 20:57:42,002 INFO L138 Inliner]: procedures = 17, calls = 30, calls flagged for inlining = 4, calls inlined = 4, statements flattened = 92 [2023-11-06 20:57:42,003 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-11-06 20:57:42,003 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-11-06 20:57:42,004 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-11-06 20:57:42,004 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-11-06 20:57:42,013 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 08:57:41" (1/1) ... [2023-11-06 20:57:42,014 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 08:57:41" (1/1) ... [2023-11-06 20:57:42,016 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 08:57:41" (1/1) ... [2023-11-06 20:57:42,016 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 08:57:41" (1/1) ... [2023-11-06 20:57:42,023 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 08:57:41" (1/1) ... [2023-11-06 20:57:42,028 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 08:57:41" (1/1) ... [2023-11-06 20:57:42,029 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 08:57:41" (1/1) ... [2023-11-06 20:57:42,031 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 08:57:41" (1/1) ... [2023-11-06 20:57:42,033 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-11-06 20:57:42,034 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-11-06 20:57:42,034 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-11-06 20:57:42,035 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-11-06 20:57:42,036 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 08:57:41" (1/1) ... [2023-11-06 20:57:42,051 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-06 20:57:42,064 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa1c05b6-7b42-4263-a52b-d676050797ad/bin/utaipan-verify-FOvIYxoinp/z3 [2023-11-06 20:57:42,084 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa1c05b6-7b42-4263-a52b-d676050797ad/bin/utaipan-verify-FOvIYxoinp/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-11-06 20:57:42,087 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa1c05b6-7b42-4263-a52b-d676050797ad/bin/utaipan-verify-FOvIYxoinp/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-11-06 20:57:42,116 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-11-06 20:57:42,116 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-11-06 20:57:42,116 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2023-11-06 20:57:42,116 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2023-11-06 20:57:42,117 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2023-11-06 20:57:42,117 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-11-06 20:57:42,117 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-11-06 20:57:42,117 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2023-11-06 20:57:42,117 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-11-06 20:57:42,195 INFO L236 CfgBuilder]: Building ICFG [2023-11-06 20:57:42,197 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2023-11-06 20:57:42,392 INFO L277 CfgBuilder]: Performing block encoding [2023-11-06 20:57:42,450 INFO L297 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-11-06 20:57:42,450 INFO L302 CfgBuilder]: Removed 4 assume(true) statements. [2023-11-06 20:57:42,453 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.11 08:57:42 BoogieIcfgContainer [2023-11-06 20:57:42,454 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-11-06 20:57:42,457 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-11-06 20:57:42,457 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-11-06 20:57:42,461 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-11-06 20:57:42,462 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 06.11 08:57:41" (1/3) ... [2023-11-06 20:57:42,463 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5e8cc7f6 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.11 08:57:42, skipping insertion in model container [2023-11-06 20:57:42,463 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 08:57:41" (2/3) ... [2023-11-06 20:57:42,463 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5e8cc7f6 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.11 08:57:42, skipping insertion in model container [2023-11-06 20:57:42,464 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.11 08:57:42" (3/3) ... [2023-11-06 20:57:42,465 INFO L112 eAbstractionObserver]: Analyzing ICFG sina2.c [2023-11-06 20:57:42,488 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-11-06 20:57:42,488 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-11-06 20:57:42,561 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-11-06 20:57:42,570 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=true, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, 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;@6a391f61, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-11-06 20:57:42,571 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-11-06 20:57:42,575 INFO L276 IsEmpty]: Start isEmpty. Operand has 12 states, 10 states have (on average 1.7) internal successors, (17), 11 states have internal predecessors, (17), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 20:57:42,583 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2023-11-06 20:57:42,584 INFO L187 NwaCegarLoop]: Found error trace [2023-11-06 20:57:42,584 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2023-11-06 20:57:42,585 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-06 20:57:42,590 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-11-06 20:57:42,590 INFO L85 PathProgramCache]: Analyzing trace with hash -228319609, now seen corresponding path program 1 times [2023-11-06 20:57:42,598 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-06 20:57:42,599 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1278769620] [2023-11-06 20:57:42,599 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 20:57:42,600 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-06 20:57:42,727 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 20:57:42,910 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-06 20:57:42,912 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-06 20:57:42,913 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1278769620] [2023-11-06 20:57:42,914 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1278769620] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-06 20:57:42,915 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-06 20:57:42,916 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-11-06 20:57:42,918 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1807603058] [2023-11-06 20:57:42,919 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-06 20:57:42,926 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-06 20:57:42,926 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-06 20:57:42,966 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-06 20:57:42,966 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-06 20:57:42,969 INFO L87 Difference]: Start difference. First operand has 12 states, 10 states have (on average 1.7) internal successors, (17), 11 states have internal predecessors, (17), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 3 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 3 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 20:57:43,066 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-06 20:57:43,067 INFO L93 Difference]: Finished difference Result 22 states and 31 transitions. [2023-11-06 20:57:43,068 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-06 20:57:43,069 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 3 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 8 [2023-11-06 20:57:43,070 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-06 20:57:43,078 INFO L225 Difference]: With dead ends: 22 [2023-11-06 20:57:43,078 INFO L226 Difference]: Without dead ends: 11 [2023-11-06 20:57:43,081 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-06 20:57:43,085 INFO L413 NwaCegarLoop]: 5 mSDtfsCounter, 0 mSDsluCounter, 3 mSDsCounter, 0 mSdLazyCounter, 23 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 8 SdHoareTripleChecker+Invalid, 23 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 23 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-06 20:57:43,086 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 8 Invalid, 23 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 23 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-06 20:57:43,107 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 11 states. [2023-11-06 20:57:43,121 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 11 to 11. [2023-11-06 20:57:43,122 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 11 states, 10 states have (on average 1.4) internal successors, (14), 10 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 20:57:43,123 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11 states to 11 states and 14 transitions. [2023-11-06 20:57:43,124 INFO L78 Accepts]: Start accepts. Automaton has 11 states and 14 transitions. Word has length 8 [2023-11-06 20:57:43,125 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-06 20:57:43,126 INFO L495 AbstractCegarLoop]: Abstraction has 11 states and 14 transitions. [2023-11-06 20:57:43,126 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 3 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 20:57:43,126 INFO L276 IsEmpty]: Start isEmpty. Operand 11 states and 14 transitions. [2023-11-06 20:57:43,127 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2023-11-06 20:57:43,127 INFO L187 NwaCegarLoop]: Found error trace [2023-11-06 20:57:43,127 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-06 20:57:43,128 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-11-06 20:57:43,128 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-06 20:57:43,129 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-11-06 20:57:43,130 INFO L85 PathProgramCache]: Analyzing trace with hash 1111630449, now seen corresponding path program 1 times [2023-11-06 20:57:43,131 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-06 20:57:43,131 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [472772476] [2023-11-06 20:57:43,131 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 20:57:43,131 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-06 20:57:43,196 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 20:57:43,334 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-06 20:57:43,334 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-06 20:57:43,335 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [472772476] [2023-11-06 20:57:43,335 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [472772476] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-06 20:57:43,335 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-06 20:57:43,335 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-11-06 20:57:43,335 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1325617419] [2023-11-06 20:57:43,336 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-06 20:57:43,337 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-11-06 20:57:43,337 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-06 20:57:43,338 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-11-06 20:57:43,338 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2023-11-06 20:57:43,339 INFO L87 Difference]: Start difference. First operand 11 states and 14 transitions. Second operand has 4 states, 4 states have (on average 2.25) internal successors, (9), 4 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) [2023-11-06 20:57:43,377 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-06 20:57:43,377 INFO L93 Difference]: Finished difference Result 24 states and 30 transitions. [2023-11-06 20:57:43,378 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-11-06 20:57:43,378 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.25) internal successors, (9), 4 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 [2023-11-06 20:57:43,379 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-06 20:57:43,379 INFO L225 Difference]: With dead ends: 24 [2023-11-06 20:57:43,379 INFO L226 Difference]: Without dead ends: 18 [2023-11-06 20:57:43,380 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2023-11-06 20:57:43,381 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 14 mSDsluCounter, 3 mSDsCounter, 0 mSdLazyCounter, 17 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 6 SdHoareTripleChecker+Invalid, 21 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 17 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-06 20:57:43,382 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [14 Valid, 6 Invalid, 21 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 17 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-06 20:57:43,383 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2023-11-06 20:57:43,386 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 13. [2023-11-06 20:57:43,387 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 13 states, 12 states have (on average 1.3333333333333333) internal successors, (16), 12 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 20:57:43,387 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 16 transitions. [2023-11-06 20:57:43,388 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 16 transitions. Word has length 9 [2023-11-06 20:57:43,388 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-06 20:57:43,388 INFO L495 AbstractCegarLoop]: Abstraction has 13 states and 16 transitions. [2023-11-06 20:57:43,388 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 2.25) internal successors, (9), 4 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) [2023-11-06 20:57:43,389 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 16 transitions. [2023-11-06 20:57:43,389 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2023-11-06 20:57:43,389 INFO L187 NwaCegarLoop]: Found error trace [2023-11-06 20:57:43,389 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-06 20:57:43,390 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2023-11-06 20:57:43,390 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-06 20:57:43,391 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-11-06 20:57:43,391 INFO L85 PathProgramCache]: Analyzing trace with hash 141398424, now seen corresponding path program 1 times [2023-11-06 20:57:43,391 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-06 20:57:43,391 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2037760190] [2023-11-06 20:57:43,391 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 20:57:43,392 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-06 20:57:43,458 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 20:57:44,578 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-06 20:57:44,579 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-06 20:57:44,580 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2037760190] [2023-11-06 20:57:44,580 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2037760190] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-06 20:57:44,582 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2118737231] [2023-11-06 20:57:44,582 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 20:57:44,583 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-06 20:57:44,584 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa1c05b6-7b42-4263-a52b-d676050797ad/bin/utaipan-verify-FOvIYxoinp/z3 [2023-11-06 20:57:44,590 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa1c05b6-7b42-4263-a52b-d676050797ad/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-06 20:57:44,624 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa1c05b6-7b42-4263-a52b-d676050797ad/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-11-06 20:57:44,693 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 20:57:44,697 INFO L262 TraceCheckSpWp]: Trace formula consists of 109 conjuncts, 37 conjunts are in the unsatisfiable core [2023-11-06 20:57:44,708 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-06 20:57:44,779 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2023-11-06 20:57:44,800 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2023-11-06 20:57:44,838 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 18 [2023-11-06 20:57:44,910 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 21 [2023-11-06 20:57:45,022 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 21 [2023-11-06 20:57:45,179 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-06 20:57:45,179 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-06 20:57:45,477 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-06 20:57:45,477 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2118737231] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-06 20:57:45,478 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [431077367] [2023-11-06 20:57:45,498 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2023-11-06 20:57:45,499 INFO L166 IcfgInterpreter]: Building call graph [2023-11-06 20:57:45,503 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-06 20:57:45,509 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-06 20:57:45,510 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-06 20:57:46,307 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-06 20:57:46,698 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '206#(and (= |ULTIMATE.start_main_~i~0#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~a~0#1.base|) |ULTIMATE.start_main_~a~0#1.offset|) |ULTIMATE.start_main_#t~mem14#1|) (<= 1 ~N~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0) (not (= (+ ~N~0 1) |ULTIMATE.start_main_#t~mem14#1|)))' at error location [2023-11-06 20:57:46,698 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-06 20:57:46,698 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-06 20:57:46,698 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10] total 22 [2023-11-06 20:57:46,699 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1479504420] [2023-11-06 20:57:46,699 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-06 20:57:46,699 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2023-11-06 20:57:46,700 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-06 20:57:46,701 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2023-11-06 20:57:46,702 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=649, Unknown=0, NotChecked=0, Total=756 [2023-11-06 20:57:46,703 INFO L87 Difference]: Start difference. First operand 13 states and 16 transitions. Second operand has 22 states, 22 states have (on average 1.1363636363636365) internal successors, (25), 22 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) [2023-11-06 20:57:47,382 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-06 20:57:47,382 INFO L93 Difference]: Finished difference Result 34 states and 41 transitions. [2023-11-06 20:57:47,382 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2023-11-06 20:57:47,383 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 1.1363636363636365) internal successors, (25), 22 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 11 [2023-11-06 20:57:47,383 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-06 20:57:47,384 INFO L225 Difference]: With dead ends: 34 [2023-11-06 20:57:47,384 INFO L226 Difference]: Without dead ends: 32 [2023-11-06 20:57:47,385 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 15 SyntacticMatches, 0 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 275 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=173, Invalid=1017, Unknown=0, NotChecked=0, Total=1190 [2023-11-06 20:57:47,386 INFO L413 NwaCegarLoop]: 5 mSDtfsCounter, 27 mSDsluCounter, 56 mSDsCounter, 0 mSdLazyCounter, 204 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 27 SdHoareTripleChecker+Valid, 61 SdHoareTripleChecker+Invalid, 210 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 204 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-06 20:57:47,387 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [27 Valid, 61 Invalid, 210 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 204 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-11-06 20:57:47,388 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2023-11-06 20:57:47,399 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 21. [2023-11-06 20:57:47,400 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 21 states, 20 states have (on average 1.4) internal successors, (28), 20 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) [2023-11-06 20:57:47,401 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 28 transitions. [2023-11-06 20:57:47,401 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 28 transitions. Word has length 11 [2023-11-06 20:57:47,402 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-06 20:57:47,402 INFO L495 AbstractCegarLoop]: Abstraction has 21 states and 28 transitions. [2023-11-06 20:57:47,403 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 22 states have (on average 1.1363636363636365) internal successors, (25), 22 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) [2023-11-06 20:57:47,403 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 28 transitions. [2023-11-06 20:57:47,403 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2023-11-06 20:57:47,404 INFO L187 NwaCegarLoop]: Found error trace [2023-11-06 20:57:47,404 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-06 20:57:47,411 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa1c05b6-7b42-4263-a52b-d676050797ad/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2023-11-06 20:57:47,610 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa1c05b6-7b42-4263-a52b-d676050797ad/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2 [2023-11-06 20:57:47,610 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-06 20:57:47,611 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-11-06 20:57:47,611 INFO L85 PathProgramCache]: Analyzing trace with hash 1167527278, now seen corresponding path program 2 times [2023-11-06 20:57:47,611 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-06 20:57:47,613 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [94177638] [2023-11-06 20:57:47,613 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 20:57:47,613 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-06 20:57:47,638 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 20:57:47,737 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-06 20:57:47,737 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-06 20:57:47,737 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [94177638] [2023-11-06 20:57:47,737 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [94177638] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-06 20:57:47,738 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [303777138] [2023-11-06 20:57:47,738 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-11-06 20:57:47,738 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-06 20:57:47,738 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa1c05b6-7b42-4263-a52b-d676050797ad/bin/utaipan-verify-FOvIYxoinp/z3 [2023-11-06 20:57:47,739 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa1c05b6-7b42-4263-a52b-d676050797ad/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-06 20:57:47,775 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa1c05b6-7b42-4263-a52b-d676050797ad/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-11-06 20:57:47,834 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2023-11-06 20:57:47,834 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-06 20:57:47,836 INFO L262 TraceCheckSpWp]: Trace formula consists of 116 conjuncts, 6 conjunts are in the unsatisfiable core [2023-11-06 20:57:47,838 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-06 20:57:47,892 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-06 20:57:47,892 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-06 20:57:47,936 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-06 20:57:47,936 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [303777138] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-06 20:57:47,937 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1151965617] [2023-11-06 20:57:47,939 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2023-11-06 20:57:47,940 INFO L166 IcfgInterpreter]: Building call graph [2023-11-06 20:57:47,940 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-06 20:57:47,940 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-06 20:57:47,941 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-06 20:57:48,388 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-06 20:57:48,718 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '388#(and (= |ULTIMATE.start_main_~i~0#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~a~0#1.base|) |ULTIMATE.start_main_~a~0#1.offset|) |ULTIMATE.start_main_#t~mem14#1|) (<= 1 ~N~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0) (exists ((|v_ULTIMATE.start_main_~i~0#1_102| Int)) (and (<= ~N~0 |v_ULTIMATE.start_main_~i~0#1_102|) (= |ULTIMATE.start_main_~a~0#1.offset| 0) (= |ULTIMATE.start_main_~#sum~0#1.offset| 0))) (not (= (+ ~N~0 1) |ULTIMATE.start_main_#t~mem14#1|)))' at error location [2023-11-06 20:57:48,718 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-06 20:57:48,718 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-06 20:57:48,718 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 11 [2023-11-06 20:57:48,718 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [131766079] [2023-11-06 20:57:48,719 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-06 20:57:48,719 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2023-11-06 20:57:48,719 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-06 20:57:48,720 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2023-11-06 20:57:48,720 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=64, Invalid=208, Unknown=0, NotChecked=0, Total=272 [2023-11-06 20:57:48,720 INFO L87 Difference]: Start difference. First operand 21 states and 28 transitions. Second operand has 11 states, 11 states have (on average 1.7272727272727273) internal successors, (19), 11 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 20:57:48,917 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-06 20:57:48,917 INFO L93 Difference]: Finished difference Result 44 states and 54 transitions. [2023-11-06 20:57:48,918 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2023-11-06 20:57:48,918 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 1.7272727272727273) internal successors, (19), 11 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 12 [2023-11-06 20:57:48,918 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-06 20:57:48,919 INFO L225 Difference]: With dead ends: 44 [2023-11-06 20:57:48,919 INFO L226 Difference]: Without dead ends: 37 [2023-11-06 20:57:48,920 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 20 SyntacticMatches, 6 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 135 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=93, Invalid=327, Unknown=0, NotChecked=0, Total=420 [2023-11-06 20:57:48,921 INFO L413 NwaCegarLoop]: 10 mSDtfsCounter, 38 mSDsluCounter, 25 mSDsCounter, 0 mSdLazyCounter, 115 mSolverCounterSat, 33 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 38 SdHoareTripleChecker+Valid, 35 SdHoareTripleChecker+Invalid, 148 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 33 IncrementalHoareTripleChecker+Valid, 115 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-06 20:57:48,921 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [38 Valid, 35 Invalid, 148 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [33 Valid, 115 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-06 20:57:48,922 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2023-11-06 20:57:48,929 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 23. [2023-11-06 20:57:48,930 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 23 states, 22 states have (on average 1.3636363636363635) internal successors, (30), 22 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) [2023-11-06 20:57:48,931 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 30 transitions. [2023-11-06 20:57:48,931 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 30 transitions. Word has length 12 [2023-11-06 20:57:48,931 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-06 20:57:48,932 INFO L495 AbstractCegarLoop]: Abstraction has 23 states and 30 transitions. [2023-11-06 20:57:48,932 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 11 states have (on average 1.7272727272727273) internal successors, (19), 11 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 20:57:48,932 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 30 transitions. [2023-11-06 20:57:48,933 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2023-11-06 20:57:48,933 INFO L187 NwaCegarLoop]: Found error trace [2023-11-06 20:57:48,933 INFO L195 NwaCegarLoop]: trace histogram [3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-06 20:57:48,964 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa1c05b6-7b42-4263-a52b-d676050797ad/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Ended with exit code 0 [2023-11-06 20:57:49,160 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa1c05b6-7b42-4263-a52b-d676050797ad/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-06 20:57:49,160 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-06 20:57:49,161 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-11-06 20:57:49,161 INFO L85 PathProgramCache]: Analyzing trace with hash -1934578216, now seen corresponding path program 3 times [2023-11-06 20:57:49,161 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-06 20:57:49,161 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [531104112] [2023-11-06 20:57:49,161 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 20:57:49,162 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-06 20:57:49,178 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 20:57:49,265 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 4 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-06 20:57:49,265 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-06 20:57:49,266 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [531104112] [2023-11-06 20:57:49,266 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [531104112] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-06 20:57:49,266 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1794084371] [2023-11-06 20:57:49,266 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-11-06 20:57:49,266 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-06 20:57:49,267 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa1c05b6-7b42-4263-a52b-d676050797ad/bin/utaipan-verify-FOvIYxoinp/z3 [2023-11-06 20:57:49,272 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa1c05b6-7b42-4263-a52b-d676050797ad/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-06 20:57:49,295 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa1c05b6-7b42-4263-a52b-d676050797ad/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-11-06 20:57:49,336 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-11-06 20:57:49,337 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-06 20:57:49,338 INFO L262 TraceCheckSpWp]: Trace formula consists of 56 conjuncts, 6 conjunts are in the unsatisfiable core [2023-11-06 20:57:49,339 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-06 20:57:49,377 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 5 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-11-06 20:57:49,377 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-06 20:57:49,404 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 5 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-11-06 20:57:49,405 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1794084371] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-06 20:57:49,405 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [835965511] [2023-11-06 20:57:49,407 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2023-11-06 20:57:49,408 INFO L166 IcfgInterpreter]: Building call graph [2023-11-06 20:57:49,408 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-06 20:57:49,408 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-06 20:57:49,408 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-06 20:57:49,774 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-06 20:57:49,998 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '592#(and (= |ULTIMATE.start_main_~i~0#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~a~0#1.base|) |ULTIMATE.start_main_~a~0#1.offset|) |ULTIMATE.start_main_#t~mem14#1|) (<= 1 ~N~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0) (not (= (+ ~N~0 1) |ULTIMATE.start_main_#t~mem14#1|)))' at error location [2023-11-06 20:57:49,998 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-06 20:57:49,998 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-06 20:57:49,999 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 6, 6] total 12 [2023-11-06 20:57:49,999 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1193190073] [2023-11-06 20:57:49,999 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-06 20:57:49,999 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2023-11-06 20:57:49,999 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-06 20:57:50,000 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2023-11-06 20:57:50,001 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=63, Invalid=209, Unknown=0, NotChecked=0, Total=272 [2023-11-06 20:57:50,001 INFO L87 Difference]: Start difference. First operand 23 states and 30 transitions. Second operand has 12 states, 12 states have (on average 2.0) internal successors, (24), 12 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) [2023-11-06 20:57:50,102 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-06 20:57:50,102 INFO L93 Difference]: Finished difference Result 46 states and 55 transitions. [2023-11-06 20:57:50,103 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-11-06 20:57:50,103 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 2.0) internal successors, (24), 12 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 13 [2023-11-06 20:57:50,103 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-06 20:57:50,104 INFO L225 Difference]: With dead ends: 46 [2023-11-06 20:57:50,104 INFO L226 Difference]: Without dead ends: 26 [2023-11-06 20:57:50,105 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 28 SyntacticMatches, 2 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 93 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=72, Invalid=234, Unknown=0, NotChecked=0, Total=306 [2023-11-06 20:57:50,106 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 20 mSDsluCounter, 23 mSDsCounter, 0 mSdLazyCounter, 78 mSolverCounterSat, 20 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 20 SdHoareTripleChecker+Valid, 26 SdHoareTripleChecker+Invalid, 98 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 20 IncrementalHoareTripleChecker+Valid, 78 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-06 20:57:50,107 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [20 Valid, 26 Invalid, 98 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [20 Valid, 78 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-06 20:57:50,107 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2023-11-06 20:57:50,111 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 16. [2023-11-06 20:57:50,112 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 16 states, 15 states have (on average 1.2666666666666666) internal successors, (19), 15 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 20:57:50,112 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 19 transitions. [2023-11-06 20:57:50,113 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 19 transitions. Word has length 13 [2023-11-06 20:57:50,113 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-06 20:57:50,113 INFO L495 AbstractCegarLoop]: Abstraction has 16 states and 19 transitions. [2023-11-06 20:57:50,113 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 12 states have (on average 2.0) internal successors, (24), 12 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) [2023-11-06 20:57:50,113 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 19 transitions. [2023-11-06 20:57:50,114 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2023-11-06 20:57:50,114 INFO L187 NwaCegarLoop]: Found error trace [2023-11-06 20:57:50,114 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-06 20:57:50,121 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa1c05b6-7b42-4263-a52b-d676050797ad/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2023-11-06 20:57:50,320 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa1c05b6-7b42-4263-a52b-d676050797ad/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-06 20:57:50,320 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-06 20:57:50,321 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-11-06 20:57:50,321 INFO L85 PathProgramCache]: Analyzing trace with hash 1506151399, now seen corresponding path program 4 times [2023-11-06 20:57:50,321 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-06 20:57:50,321 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1156140728] [2023-11-06 20:57:50,321 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 20:57:50,321 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-06 20:57:50,385 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 20:57:51,644 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-06 20:57:51,646 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-06 20:57:51,646 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1156140728] [2023-11-06 20:57:51,647 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1156140728] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-06 20:57:51,647 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1106278678] [2023-11-06 20:57:51,647 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-11-06 20:57:51,647 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-06 20:57:51,648 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa1c05b6-7b42-4263-a52b-d676050797ad/bin/utaipan-verify-FOvIYxoinp/z3 [2023-11-06 20:57:51,649 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa1c05b6-7b42-4263-a52b-d676050797ad/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-06 20:57:51,675 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa1c05b6-7b42-4263-a52b-d676050797ad/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-11-06 20:57:51,735 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 20:57:51,737 INFO L262 TraceCheckSpWp]: Trace formula consists of 130 conjuncts, 51 conjunts are in the unsatisfiable core [2023-11-06 20:57:51,742 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-06 20:57:51,752 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2023-11-06 20:57:51,758 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2023-11-06 20:57:51,782 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 18 [2023-11-06 20:57:51,800 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2023-11-06 20:57:51,862 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 33 treesize of output 31 [2023-11-06 20:57:51,924 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 33 treesize of output 31 [2023-11-06 20:57:52,058 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 33 treesize of output 31 [2023-11-06 20:57:52,143 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 37 treesize of output 24 [2023-11-06 20:57:52,272 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-06 20:57:52,272 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-06 20:57:52,911 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-06 20:57:52,912 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1106278678] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-06 20:57:52,912 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [108745619] [2023-11-06 20:57:52,915 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2023-11-06 20:57:52,915 INFO L166 IcfgInterpreter]: Building call graph [2023-11-06 20:57:52,916 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-06 20:57:52,916 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-06 20:57:52,916 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-06 20:57:53,364 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-06 20:57:53,799 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '804#(and (= |ULTIMATE.start_main_~i~0#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~a~0#1.base|) |ULTIMATE.start_main_~a~0#1.offset|) |ULTIMATE.start_main_#t~mem14#1|) (<= 1 ~N~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0) (not (= (+ ~N~0 1) |ULTIMATE.start_main_#t~mem14#1|)))' at error location [2023-11-06 20:57:53,799 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-06 20:57:53,799 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-06 20:57:53,799 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 30 [2023-11-06 20:57:53,799 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1148782590] [2023-11-06 20:57:53,799 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-06 20:57:53,800 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 30 states [2023-11-06 20:57:53,800 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-06 20:57:53,801 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2023-11-06 20:57:53,801 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=147, Invalid=1185, Unknown=0, NotChecked=0, Total=1332 [2023-11-06 20:57:53,802 INFO L87 Difference]: Start difference. First operand 16 states and 19 transitions. Second operand has 30 states, 30 states have (on average 1.1) internal successors, (33), 30 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) [2023-11-06 20:57:55,510 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-06 20:57:55,510 INFO L93 Difference]: Finished difference Result 52 states and 63 transitions. [2023-11-06 20:57:55,511 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2023-11-06 20:57:55,511 INFO L78 Accepts]: Start accepts. Automaton has has 30 states, 30 states have (on average 1.1) internal successors, (33), 30 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 14 [2023-11-06 20:57:55,511 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-06 20:57:55,512 INFO L225 Difference]: With dead ends: 52 [2023-11-06 20:57:55,512 INFO L226 Difference]: Without dead ends: 43 [2023-11-06 20:57:55,513 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 66 GetRequests, 18 SyntacticMatches, 0 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 604 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=286, Invalid=2164, Unknown=0, NotChecked=0, Total=2450 [2023-11-06 20:57:55,515 INFO L413 NwaCegarLoop]: 5 mSDtfsCounter, 55 mSDsluCounter, 88 mSDsCounter, 0 mSdLazyCounter, 311 mSolverCounterSat, 16 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 55 SdHoareTripleChecker+Valid, 93 SdHoareTripleChecker+Invalid, 327 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 16 IncrementalHoareTripleChecker+Valid, 311 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2023-11-06 20:57:55,515 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [55 Valid, 93 Invalid, 327 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [16 Valid, 311 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2023-11-06 20:57:55,516 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2023-11-06 20:57:55,528 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 27. [2023-11-06 20:57:55,528 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27 states, 26 states have (on average 1.3076923076923077) internal successors, (34), 26 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 20:57:55,529 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 34 transitions. [2023-11-06 20:57:55,529 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 34 transitions. Word has length 14 [2023-11-06 20:57:55,530 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-06 20:57:55,530 INFO L495 AbstractCegarLoop]: Abstraction has 27 states and 34 transitions. [2023-11-06 20:57:55,530 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 30 states, 30 states have (on average 1.1) internal successors, (33), 30 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) [2023-11-06 20:57:55,530 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 34 transitions. [2023-11-06 20:57:55,531 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2023-11-06 20:57:55,531 INFO L187 NwaCegarLoop]: Found error trace [2023-11-06 20:57:55,532 INFO L195 NwaCegarLoop]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-06 20:57:55,543 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa1c05b6-7b42-4263-a52b-d676050797ad/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2023-11-06 20:57:55,738 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa1c05b6-7b42-4263-a52b-d676050797ad/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2023-11-06 20:57:55,738 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-06 20:57:55,738 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-11-06 20:57:55,739 INFO L85 PathProgramCache]: Analyzing trace with hash -666372015, now seen corresponding path program 5 times [2023-11-06 20:57:55,739 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-06 20:57:55,739 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1941815481] [2023-11-06 20:57:55,739 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 20:57:55,739 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-06 20:57:55,761 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 20:57:55,875 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 1 proven. 8 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2023-11-06 20:57:55,876 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-06 20:57:55,876 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1941815481] [2023-11-06 20:57:55,876 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1941815481] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-06 20:57:55,876 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [974793978] [2023-11-06 20:57:55,876 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-11-06 20:57:55,877 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-06 20:57:55,877 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa1c05b6-7b42-4263-a52b-d676050797ad/bin/utaipan-verify-FOvIYxoinp/z3 [2023-11-06 20:57:55,878 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa1c05b6-7b42-4263-a52b-d676050797ad/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-06 20:57:55,896 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa1c05b6-7b42-4263-a52b-d676050797ad/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-11-06 20:57:55,980 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2023-11-06 20:57:55,980 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-06 20:57:55,982 INFO L262 TraceCheckSpWp]: Trace formula consists of 137 conjuncts, 8 conjunts are in the unsatisfiable core [2023-11-06 20:57:55,984 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-06 20:57:56,046 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 3 proven. 6 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2023-11-06 20:57:56,046 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-06 20:57:56,105 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 3 proven. 6 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2023-11-06 20:57:56,105 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [974793978] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-06 20:57:56,105 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [428412103] [2023-11-06 20:57:56,107 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2023-11-06 20:57:56,107 INFO L166 IcfgInterpreter]: Building call graph [2023-11-06 20:57:56,108 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-06 20:57:56,108 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-06 20:57:56,108 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-06 20:57:56,454 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-06 20:57:56,700 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1062#(and (= |ULTIMATE.start_main_~i~0#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~a~0#1.base|) |ULTIMATE.start_main_~a~0#1.offset|) |ULTIMATE.start_main_#t~mem14#1|) (<= 1 ~N~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0) (not (= (+ ~N~0 1) |ULTIMATE.start_main_#t~mem14#1|)))' at error location [2023-11-06 20:57:56,701 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-06 20:57:56,701 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-06 20:57:56,701 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 14 [2023-11-06 20:57:56,701 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1380509365] [2023-11-06 20:57:56,701 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-06 20:57:56,702 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2023-11-06 20:57:56,702 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-06 20:57:56,702 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2023-11-06 20:57:56,703 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=69, Invalid=237, Unknown=0, NotChecked=0, Total=306 [2023-11-06 20:57:56,703 INFO L87 Difference]: Start difference. First operand 27 states and 34 transitions. Second operand has 14 states, 14 states have (on average 1.5714285714285714) internal successors, (22), 14 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) [2023-11-06 20:57:56,944 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-06 20:57:56,944 INFO L93 Difference]: Finished difference Result 61 states and 71 transitions. [2023-11-06 20:57:56,945 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2023-11-06 20:57:56,945 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 1.5714285714285714) internal successors, (22), 14 states have internal predecessors, (22), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 15 [2023-11-06 20:57:56,945 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-06 20:57:56,946 INFO L225 Difference]: With dead ends: 61 [2023-11-06 20:57:56,946 INFO L226 Difference]: Without dead ends: 53 [2023-11-06 20:57:56,947 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 24 SyntacticMatches, 12 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 252 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=118, Invalid=434, Unknown=0, NotChecked=0, Total=552 [2023-11-06 20:57:56,948 INFO L413 NwaCegarLoop]: 16 mSDtfsCounter, 58 mSDsluCounter, 49 mSDsCounter, 0 mSdLazyCounter, 163 mSolverCounterSat, 40 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 58 SdHoareTripleChecker+Valid, 65 SdHoareTripleChecker+Invalid, 203 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 40 IncrementalHoareTripleChecker+Valid, 163 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-06 20:57:56,948 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [58 Valid, 65 Invalid, 203 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [40 Valid, 163 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-11-06 20:57:56,949 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2023-11-06 20:57:56,958 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 29. [2023-11-06 20:57:56,958 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 29 states, 28 states have (on average 1.2857142857142858) internal successors, (36), 28 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 20:57:56,959 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 36 transitions. [2023-11-06 20:57:56,959 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 36 transitions. Word has length 15 [2023-11-06 20:57:56,960 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-06 20:57:56,960 INFO L495 AbstractCegarLoop]: Abstraction has 29 states and 36 transitions. [2023-11-06 20:57:56,960 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 1.5714285714285714) internal successors, (22), 14 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) [2023-11-06 20:57:56,960 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 36 transitions. [2023-11-06 20:57:56,961 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2023-11-06 20:57:56,961 INFO L187 NwaCegarLoop]: Found error trace [2023-11-06 20:57:56,961 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-06 20:57:56,973 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa1c05b6-7b42-4263-a52b-d676050797ad/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2023-11-06 20:57:57,167 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa1c05b6-7b42-4263-a52b-d676050797ad/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2023-11-06 20:57:57,168 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-06 20:57:57,168 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-11-06 20:57:57,168 INFO L85 PathProgramCache]: Analyzing trace with hash 648069560, now seen corresponding path program 6 times [2023-11-06 20:57:57,169 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-06 20:57:57,169 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1568691127] [2023-11-06 20:57:57,169 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 20:57:57,169 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-06 20:57:57,244 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 20:57:58,546 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-06 20:57:58,546 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-06 20:57:58,547 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1568691127] [2023-11-06 20:57:58,547 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1568691127] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-06 20:57:58,547 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1925331149] [2023-11-06 20:57:58,547 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-11-06 20:57:58,547 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-06 20:57:58,547 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa1c05b6-7b42-4263-a52b-d676050797ad/bin/utaipan-verify-FOvIYxoinp/z3 [2023-11-06 20:57:58,548 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa1c05b6-7b42-4263-a52b-d676050797ad/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-06 20:57:58,555 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa1c05b6-7b42-4263-a52b-d676050797ad/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2023-11-06 20:57:58,651 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-11-06 20:57:58,651 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-06 20:57:58,654 INFO L262 TraceCheckSpWp]: Trace formula consists of 151 conjuncts, 68 conjunts are in the unsatisfiable core [2023-11-06 20:57:58,661 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-06 20:57:58,670 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2023-11-06 20:57:58,675 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2023-11-06 20:57:58,689 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 18 [2023-11-06 20:57:58,705 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2023-11-06 20:57:58,729 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 33 treesize of output 38 [2023-11-06 20:57:58,819 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 4 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 0 case distinctions, treesize of input 40 treesize of output 41 [2023-11-06 20:57:58,888 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 4 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 0 case distinctions, treesize of input 40 treesize of output 41 [2023-11-06 20:57:58,968 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 4 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 0 case distinctions, treesize of input 40 treesize of output 41 [2023-11-06 20:57:59,097 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 4 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 0 case distinctions, treesize of input 40 treesize of output 41 [2023-11-06 20:57:59,183 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 4 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 0 case distinctions, treesize of input 44 treesize of output 34 [2023-11-06 20:57:59,253 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 37 treesize of output 24 [2023-11-06 20:57:59,387 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-06 20:57:59,387 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-06 20:58:00,577 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-06 20:58:00,578 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1925331149] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-06 20:58:00,578 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [968649752] [2023-11-06 20:58:00,580 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2023-11-06 20:58:00,580 INFO L166 IcfgInterpreter]: Building call graph [2023-11-06 20:58:00,580 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-06 20:58:00,581 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-06 20:58:00,581 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-06 20:58:00,907 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-06 20:58:01,724 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1356#(and (= |ULTIMATE.start_main_~i~0#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~a~0#1.base|) |ULTIMATE.start_main_~a~0#1.offset|) |ULTIMATE.start_main_#t~mem14#1|) (<= 1 ~N~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0) (not (= (+ ~N~0 1) |ULTIMATE.start_main_#t~mem14#1|)) (exists ((|v_ULTIMATE.start_main_~i~0#1_213| Int)) (and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (= |ULTIMATE.start_main_~#sum~0#1.offset| 0) (<= ~N~0 |v_ULTIMATE.start_main_~i~0#1_213|))))' at error location [2023-11-06 20:58:01,724 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-06 20:58:01,724 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-06 20:58:01,724 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16, 16] total 38 [2023-11-06 20:58:01,725 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1460166492] [2023-11-06 20:58:01,725 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-06 20:58:01,725 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 38 states [2023-11-06 20:58:01,725 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-06 20:58:01,726 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2023-11-06 20:58:01,727 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=227, Invalid=1665, Unknown=0, NotChecked=0, Total=1892 [2023-11-06 20:58:01,728 INFO L87 Difference]: Start difference. First operand 29 states and 36 transitions. Second operand has 38 states, 38 states have (on average 1.0789473684210527) internal successors, (41), 38 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)