./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/array-crafted/zero_sum1.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version e7bb482b Calling Ultimate with: /usr/lib/jvm/java-1.11.0-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_372a6d0b-1092-416f-8d67-3de7f49ec30d/bin/utaipan-verify-FOvIYxoinp/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_372a6d0b-1092-416f-8d67-3de7f49ec30d/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_372a6d0b-1092-416f-8d67-3de7f49ec30d/bin/utaipan-verify-FOvIYxoinp/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_372a6d0b-1092-416f-8d67-3de7f49ec30d/bin/utaipan-verify-FOvIYxoinp/config/TaipanReach.xml -i ../../sv-benchmarks/c/array-crafted/zero_sum1.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_372a6d0b-1092-416f-8d67-3de7f49ec30d/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_372a6d0b-1092-416f-8d67-3de7f49ec30d/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 8d05359bf1cd6e974dc237604ab15e53b702ce490bf8880eb5ddff78fcd04ff1 --- Real Ultimate output --- This is Ultimate 0.2.3-dev-e7bb482 [2023-11-06 20:59:21,550 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-11-06 20:59:21,618 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_372a6d0b-1092-416f-8d67-3de7f49ec30d/bin/utaipan-verify-FOvIYxoinp/config/svcomp-Reach-32bit-Taipan_Default.epf [2023-11-06 20:59:21,624 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-11-06 20:59:21,624 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-11-06 20:59:21,650 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-11-06 20:59:21,651 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-11-06 20:59:21,652 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-11-06 20:59:21,653 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-11-06 20:59:21,653 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-11-06 20:59:21,654 INFO L153 SettingsManager]: * User list type=DISABLED [2023-11-06 20:59:21,654 INFO L151 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-11-06 20:59:21,655 INFO L153 SettingsManager]: * Explicit value domain=true [2023-11-06 20:59:21,656 INFO L153 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-11-06 20:59:21,656 INFO L153 SettingsManager]: * Octagon Domain=false [2023-11-06 20:59:21,657 INFO L153 SettingsManager]: * Abstract domain=CompoundDomain [2023-11-06 20:59:21,657 INFO L153 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-11-06 20:59:21,658 INFO L153 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-11-06 20:59:21,658 INFO L153 SettingsManager]: * Interval Domain=false [2023-11-06 20:59:21,659 INFO L151 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-11-06 20:59:21,660 INFO L153 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-11-06 20:59:21,660 INFO L153 SettingsManager]: * Simplification Technique=POLY_PAC [2023-11-06 20:59:21,661 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-11-06 20:59:21,662 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-11-06 20:59:21,662 INFO L153 SettingsManager]: * sizeof long=4 [2023-11-06 20:59:21,663 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-11-06 20:59:21,663 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-11-06 20:59:21,664 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-11-06 20:59:21,664 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-11-06 20:59:21,665 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-11-06 20:59:21,665 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-11-06 20:59:21,666 INFO L153 SettingsManager]: * sizeof long double=12 [2023-11-06 20:59:21,666 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2023-11-06 20:59:21,667 INFO L153 SettingsManager]: * Use constant arrays=true [2023-11-06 20:59:21,667 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-11-06 20:59:21,668 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-11-06 20:59:21,668 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-06 20:59:21,669 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-11-06 20:59:21,669 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-11-06 20:59:21,670 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2023-11-06 20:59:21,670 INFO L153 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-11-06 20:59:21,671 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-11-06 20:59:21,671 INFO L153 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-11-06 20:59:21,672 INFO L153 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-11-06 20:59:21,672 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-11-06 20:59:21,673 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_372a6d0b-1092-416f-8d67-3de7f49ec30d/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_372a6d0b-1092-416f-8d67-3de7f49ec30d/bin/utaipan-verify-FOvIYxoinp Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 8d05359bf1cd6e974dc237604ab15e53b702ce490bf8880eb5ddff78fcd04ff1 [2023-11-06 20:59:21,904 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-11-06 20:59:21,926 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-11-06 20:59:21,930 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-11-06 20:59:21,931 INFO L270 PluginConnector]: Initializing CDTParser... [2023-11-06 20:59:21,932 INFO L274 PluginConnector]: CDTParser initialized [2023-11-06 20:59:21,933 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_372a6d0b-1092-416f-8d67-3de7f49ec30d/bin/utaipan-verify-FOvIYxoinp/../../sv-benchmarks/c/array-crafted/zero_sum1.c [2023-11-06 20:59:25,009 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-11-06 20:59:25,302 INFO L384 CDTParser]: Found 1 translation units. [2023-11-06 20:59:25,303 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_372a6d0b-1092-416f-8d67-3de7f49ec30d/sv-benchmarks/c/array-crafted/zero_sum1.c [2023-11-06 20:59:25,311 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_372a6d0b-1092-416f-8d67-3de7f49ec30d/bin/utaipan-verify-FOvIYxoinp/data/d78d4a223/042bbd3929c0469598fd42b9ea174a69/FLAG5a370c5d5 [2023-11-06 20:59:25,333 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_372a6d0b-1092-416f-8d67-3de7f49ec30d/bin/utaipan-verify-FOvIYxoinp/data/d78d4a223/042bbd3929c0469598fd42b9ea174a69 [2023-11-06 20:59:25,343 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-11-06 20:59:25,345 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-11-06 20:59:25,349 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-11-06 20:59:25,350 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-11-06 20:59:25,355 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-11-06 20:59:25,356 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.11 08:59:25" (1/1) ... [2023-11-06 20:59:25,357 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@5448041c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 08:59:25, skipping insertion in model container [2023-11-06 20:59:25,358 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.11 08:59:25" (1/1) ... [2023-11-06 20:59:25,383 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-11-06 20:59:25,574 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_372a6d0b-1092-416f-8d67-3de7f49ec30d/sv-benchmarks/c/array-crafted/zero_sum1.c[400,413] [2023-11-06 20:59:25,597 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-06 20:59:25,609 INFO L202 MainTranslator]: Completed pre-run [2023-11-06 20:59:25,624 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_372a6d0b-1092-416f-8d67-3de7f49ec30d/sv-benchmarks/c/array-crafted/zero_sum1.c[400,413] [2023-11-06 20:59:25,631 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-06 20:59:25,646 INFO L206 MainTranslator]: Completed translation [2023-11-06 20:59:25,647 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 08:59:25 WrapperNode [2023-11-06 20:59:25,647 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-11-06 20:59:25,648 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-11-06 20:59:25,649 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-11-06 20:59:25,649 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-11-06 20:59:25,657 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 08:59:25" (1/1) ... [2023-11-06 20:59:25,665 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 08:59:25" (1/1) ... [2023-11-06 20:59:25,686 INFO L138 Inliner]: procedures = 15, calls = 13, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 64 [2023-11-06 20:59:25,687 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-11-06 20:59:25,688 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-11-06 20:59:25,688 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-11-06 20:59:25,688 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-11-06 20:59:25,698 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 08:59:25" (1/1) ... [2023-11-06 20:59:25,699 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 08:59:25" (1/1) ... [2023-11-06 20:59:25,700 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 08:59:25" (1/1) ... [2023-11-06 20:59:25,701 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 08:59:25" (1/1) ... [2023-11-06 20:59:25,706 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 08:59:25" (1/1) ... [2023-11-06 20:59:25,710 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 08:59:25" (1/1) ... [2023-11-06 20:59:25,711 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 08:59:25" (1/1) ... [2023-11-06 20:59:25,715 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 08:59:25" (1/1) ... [2023-11-06 20:59:25,717 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-11-06 20:59:25,718 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-11-06 20:59:25,718 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-11-06 20:59:25,718 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-11-06 20:59:25,719 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 08:59:25" (1/1) ... [2023-11-06 20:59:25,731 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-06 20:59:25,747 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_372a6d0b-1092-416f-8d67-3de7f49ec30d/bin/utaipan-verify-FOvIYxoinp/z3 [2023-11-06 20:59:25,762 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_372a6d0b-1092-416f-8d67-3de7f49ec30d/bin/utaipan-verify-FOvIYxoinp/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-11-06 20:59:25,799 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_372a6d0b-1092-416f-8d67-3de7f49ec30d/bin/utaipan-verify-FOvIYxoinp/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-11-06 20:59:25,808 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-11-06 20:59:25,809 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-11-06 20:59:25,809 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2023-11-06 20:59:25,809 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2023-11-06 20:59:25,810 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-11-06 20:59:25,810 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-11-06 20:59:25,812 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2023-11-06 20:59:25,813 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-11-06 20:59:25,918 INFO L236 CfgBuilder]: Building ICFG [2023-11-06 20:59:25,920 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2023-11-06 20:59:26,126 INFO L277 CfgBuilder]: Performing block encoding [2023-11-06 20:59:26,207 INFO L297 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-11-06 20:59:26,209 INFO L302 CfgBuilder]: Removed 3 assume(true) statements. [2023-11-06 20:59:26,212 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.11 08:59:26 BoogieIcfgContainer [2023-11-06 20:59:26,212 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-11-06 20:59:26,215 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-11-06 20:59:26,216 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-11-06 20:59:26,221 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-11-06 20:59:26,221 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 06.11 08:59:25" (1/3) ... [2023-11-06 20:59:26,223 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5ce810f2 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.11 08:59:26, skipping insertion in model container [2023-11-06 20:59:26,223 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 08:59:25" (2/3) ... [2023-11-06 20:59:26,225 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5ce810f2 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.11 08:59:26, skipping insertion in model container [2023-11-06 20:59:26,226 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.11 08:59:26" (3/3) ... [2023-11-06 20:59:26,227 INFO L112 eAbstractionObserver]: Analyzing ICFG zero_sum1.c [2023-11-06 20:59:26,250 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-11-06 20:59:26,250 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-11-06 20:59:26,319 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-11-06 20:59:26,328 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;@46d68636, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-11-06 20:59:26,329 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-11-06 20:59:26,334 INFO L276 IsEmpty]: Start isEmpty. Operand has 11 states, 9 states have (on average 1.6666666666666667) internal successors, (15), 10 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 20:59:26,342 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2023-11-06 20:59:26,342 INFO L187 NwaCegarLoop]: Found error trace [2023-11-06 20:59:26,343 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2023-11-06 20:59:26,344 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-06 20:59:26,351 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-11-06 20:59:26,352 INFO L85 PathProgramCache]: Analyzing trace with hash 1291623497, now seen corresponding path program 1 times [2023-11-06 20:59:26,362 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-06 20:59:26,363 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [8524968] [2023-11-06 20:59:26,363 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 20:59:26,364 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-06 20:59:26,523 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 20:59:26,685 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 20:59:26,686 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-06 20:59:26,686 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [8524968] [2023-11-06 20:59:26,687 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [8524968] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-06 20:59:26,687 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-06 20:59:26,688 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-11-06 20:59:26,689 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [895785717] [2023-11-06 20:59:26,690 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-06 20:59:26,695 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-06 20:59:26,695 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-06 20:59:26,745 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-06 20:59:26,746 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-06 20:59:26,748 INFO L87 Difference]: Start difference. First operand has 11 states, 9 states have (on average 1.6666666666666667) internal successors, (15), 10 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 3 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 20:59:26,822 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-06 20:59:26,822 INFO L93 Difference]: Finished difference Result 20 states and 27 transitions. [2023-11-06 20:59:26,823 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-06 20:59:26,825 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 3 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 7 [2023-11-06 20:59:26,825 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-06 20:59:26,835 INFO L225 Difference]: With dead ends: 20 [2023-11-06 20:59:26,835 INFO L226 Difference]: Without dead ends: 9 [2023-11-06 20:59:26,838 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 20:59:26,842 INFO L413 NwaCegarLoop]: 6 mSDtfsCounter, 0 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 17 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 10 SdHoareTripleChecker+Invalid, 17 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 17 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-06 20:59:26,851 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 10 Invalid, 17 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 17 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-06 20:59:26,871 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9 states. [2023-11-06 20:59:26,886 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9 to 9. [2023-11-06 20:59:26,888 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 9 states, 8 states have (on average 1.375) internal successors, (11), 8 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 20:59:26,888 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9 states to 9 states and 11 transitions. [2023-11-06 20:59:26,890 INFO L78 Accepts]: Start accepts. Automaton has 9 states and 11 transitions. Word has length 7 [2023-11-06 20:59:26,890 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-06 20:59:26,890 INFO L495 AbstractCegarLoop]: Abstraction has 9 states and 11 transitions. [2023-11-06 20:59:26,891 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 3 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 20:59:26,891 INFO L276 IsEmpty]: Start isEmpty. Operand 9 states and 11 transitions. [2023-11-06 20:59:26,891 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2023-11-06 20:59:26,892 INFO L187 NwaCegarLoop]: Found error trace [2023-11-06 20:59:26,892 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2023-11-06 20:59:26,892 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-11-06 20:59:26,893 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-06 20:59:26,893 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-11-06 20:59:26,894 INFO L85 PathProgramCache]: Analyzing trace with hash 1158517291, now seen corresponding path program 1 times [2023-11-06 20:59:26,894 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-06 20:59:26,894 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [329439095] [2023-11-06 20:59:26,895 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 20:59:26,895 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-06 20:59:26,917 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 20:59:27,055 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 20:59:27,055 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-06 20:59:27,056 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [329439095] [2023-11-06 20:59:27,056 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [329439095] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-06 20:59:27,056 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-06 20:59:27,056 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-11-06 20:59:27,056 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1090088669] [2023-11-06 20:59:27,057 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-06 20:59:27,058 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-11-06 20:59:27,058 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-06 20:59:27,059 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-11-06 20:59:27,059 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2023-11-06 20:59:27,060 INFO L87 Difference]: Start difference. First operand 9 states and 11 transitions. Second operand has 4 states, 4 states have (on average 2.0) internal successors, (8), 4 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 20:59:27,095 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-06 20:59:27,098 INFO L93 Difference]: Finished difference Result 15 states and 19 transitions. [2023-11-06 20:59:27,098 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-11-06 20:59:27,099 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.0) internal successors, (8), 4 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 8 [2023-11-06 20:59:27,100 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-06 20:59:27,100 INFO L225 Difference]: With dead ends: 15 [2023-11-06 20:59:27,101 INFO L226 Difference]: Without dead ends: 11 [2023-11-06 20:59:27,101 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 20:59:27,104 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 8 mSDsluCounter, 2 mSDsCounter, 0 mSdLazyCounter, 13 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 8 SdHoareTripleChecker+Valid, 5 SdHoareTripleChecker+Invalid, 15 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 13 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-06 20:59:27,106 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [8 Valid, 5 Invalid, 15 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 13 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-06 20:59:27,108 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 11 states. [2023-11-06 20:59:27,112 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 11 to 11. [2023-11-06 20:59:27,114 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 11 states, 10 states have (on average 1.3) internal successors, (13), 10 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 20:59:27,114 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11 states to 11 states and 13 transitions. [2023-11-06 20:59:27,115 INFO L78 Accepts]: Start accepts. Automaton has 11 states and 13 transitions. Word has length 8 [2023-11-06 20:59:27,115 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-06 20:59:27,115 INFO L495 AbstractCegarLoop]: Abstraction has 11 states and 13 transitions. [2023-11-06 20:59:27,116 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 2.0) internal successors, (8), 4 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 20:59:27,116 INFO L276 IsEmpty]: Start isEmpty. Operand 11 states and 13 transitions. [2023-11-06 20:59:27,117 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2023-11-06 20:59:27,117 INFO L187 NwaCegarLoop]: Found error trace [2023-11-06 20:59:27,118 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-06 20:59:27,119 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2023-11-06 20:59:27,120 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-06 20:59:27,125 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-11-06 20:59:27,130 INFO L85 PathProgramCache]: Analyzing trace with hash 797755961, now seen corresponding path program 1 times [2023-11-06 20:59:27,131 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-06 20:59:27,131 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1822287271] [2023-11-06 20:59:27,131 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 20:59:27,131 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-06 20:59:27,172 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 20:59:27,271 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-11-06 20:59:27,271 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-06 20:59:27,271 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1822287271] [2023-11-06 20:59:27,271 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1822287271] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-06 20:59:27,272 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1264835914] [2023-11-06 20:59:27,272 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 20:59:27,272 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-06 20:59:27,273 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_372a6d0b-1092-416f-8d67-3de7f49ec30d/bin/utaipan-verify-FOvIYxoinp/z3 [2023-11-06 20:59:27,276 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_372a6d0b-1092-416f-8d67-3de7f49ec30d/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-06 20:59:27,278 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_372a6d0b-1092-416f-8d67-3de7f49ec30d/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-11-06 20:59:27,342 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 20:59:27,345 INFO L262 TraceCheckSpWp]: Trace formula consists of 73 conjuncts, 4 conjunts are in the unsatisfiable core [2023-11-06 20:59:27,349 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-06 20:59:27,421 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-11-06 20:59:27,422 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-06 20:59:27,450 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-11-06 20:59:27,451 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1264835914] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-06 20:59:27,451 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1118240569] [2023-11-06 20:59:27,472 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2023-11-06 20:59:27,472 INFO L166 IcfgInterpreter]: Building call graph [2023-11-06 20:59:27,476 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-06 20:59:27,481 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-06 20:59:27,482 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-06 20:59:28,204 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-06 20:59:28,379 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '162#(and (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (not (= |ULTIMATE.start_main_~sum~0#1| 0)) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0))' at error location [2023-11-06 20:59:28,380 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-06 20:59:28,380 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-06 20:59:28,387 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 7 [2023-11-06 20:59:28,388 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1932467115] [2023-11-06 20:59:28,389 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-06 20:59:28,390 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-11-06 20:59:28,390 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-06 20:59:28,391 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-11-06 20:59:28,394 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=99, Unknown=0, NotChecked=0, Total=132 [2023-11-06 20:59:28,395 INFO L87 Difference]: Start difference. First operand 11 states and 13 transitions. Second operand has 7 states, 7 states have (on average 2.142857142857143) internal successors, (15), 7 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 20:59:28,441 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-06 20:59:28,442 INFO L93 Difference]: Finished difference Result 19 states and 23 transitions. [2023-11-06 20:59:28,442 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-11-06 20:59:28,443 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 2.142857142857143) internal successors, (15), 7 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 10 [2023-11-06 20:59:28,443 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-06 20:59:28,445 INFO L225 Difference]: With dead ends: 19 [2023-11-06 20:59:28,445 INFO L226 Difference]: Without dead ends: 12 [2023-11-06 20:59:28,446 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 21 SyntacticMatches, 1 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 37 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=33, Invalid=99, Unknown=0, NotChecked=0, Total=132 [2023-11-06 20:59:28,449 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 0 mSDsluCounter, 6 mSDsCounter, 0 mSdLazyCounter, 29 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 9 SdHoareTripleChecker+Invalid, 29 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 29 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-06 20:59:28,451 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 9 Invalid, 29 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 29 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-06 20:59:28,453 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12 states. [2023-11-06 20:59:28,458 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12 to 12. [2023-11-06 20:59:28,458 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 12 states, 11 states have (on average 1.2727272727272727) internal successors, (14), 11 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 20:59:28,459 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 14 transitions. [2023-11-06 20:59:28,460 INFO L78 Accepts]: Start accepts. Automaton has 12 states and 14 transitions. Word has length 10 [2023-11-06 20:59:28,460 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-06 20:59:28,460 INFO L495 AbstractCegarLoop]: Abstraction has 12 states and 14 transitions. [2023-11-06 20:59:28,461 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 2.142857142857143) internal successors, (15), 7 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 20:59:28,461 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states and 14 transitions. [2023-11-06 20:59:28,461 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2023-11-06 20:59:28,462 INFO L187 NwaCegarLoop]: Found error trace [2023-11-06 20:59:28,462 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-06 20:59:28,471 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_372a6d0b-1092-416f-8d67-3de7f49ec30d/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Ended with exit code 0 [2023-11-06 20:59:28,667 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_372a6d0b-1092-416f-8d67-3de7f49ec30d/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-06 20:59:28,668 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-06 20:59:28,668 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-11-06 20:59:28,669 INFO L85 PathProgramCache]: Analyzing trace with hash -314412777, now seen corresponding path program 2 times [2023-11-06 20:59:28,669 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-06 20:59:28,669 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [866065304] [2023-11-06 20:59:28,669 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 20:59:28,669 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-06 20:59:28,690 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 20:59:28,768 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-11-06 20:59:28,768 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-06 20:59:28,769 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [866065304] [2023-11-06 20:59:28,769 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [866065304] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-06 20:59:28,769 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1450974024] [2023-11-06 20:59:28,769 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-11-06 20:59:28,769 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-06 20:59:28,770 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_372a6d0b-1092-416f-8d67-3de7f49ec30d/bin/utaipan-verify-FOvIYxoinp/z3 [2023-11-06 20:59:28,771 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_372a6d0b-1092-416f-8d67-3de7f49ec30d/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-06 20:59:28,794 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_372a6d0b-1092-416f-8d67-3de7f49ec30d/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-11-06 20:59:28,858 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2023-11-06 20:59:28,859 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-06 20:59:28,860 INFO L262 TraceCheckSpWp]: Trace formula consists of 82 conjuncts, 4 conjunts are in the unsatisfiable core [2023-11-06 20:59:28,862 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-06 20:59:28,901 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-11-06 20:59:28,901 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-06 20:59:28,941 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-11-06 20:59:28,941 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1450974024] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-06 20:59:28,942 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1663077276] [2023-11-06 20:59:28,945 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2023-11-06 20:59:28,945 INFO L166 IcfgInterpreter]: Building call graph [2023-11-06 20:59:28,945 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-06 20:59:28,945 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-06 20:59:28,946 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-06 20:59:29,339 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-06 20:59:29,501 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '284#(and (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (not (= |ULTIMATE.start_main_~sum~0#1| 0)) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0))' at error location [2023-11-06 20:59:29,501 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-06 20:59:29,501 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-06 20:59:29,501 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 8 [2023-11-06 20:59:29,501 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1044255012] [2023-11-06 20:59:29,501 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-06 20:59:29,502 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2023-11-06 20:59:29,502 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-06 20:59:29,503 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2023-11-06 20:59:29,503 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=40, Invalid=116, Unknown=0, NotChecked=0, Total=156 [2023-11-06 20:59:29,503 INFO L87 Difference]: Start difference. First operand 12 states and 14 transitions. Second operand has 8 states, 8 states have (on average 1.875) internal successors, (15), 8 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 20:59:29,545 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-06 20:59:29,546 INFO L93 Difference]: Finished difference Result 19 states and 23 transitions. [2023-11-06 20:59:29,546 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-11-06 20:59:29,546 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 1.875) internal successors, (15), 8 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 11 [2023-11-06 20:59:29,547 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-06 20:59:29,547 INFO L225 Difference]: With dead ends: 19 [2023-11-06 20:59:29,547 INFO L226 Difference]: Without dead ends: 14 [2023-11-06 20:59:29,548 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 22 SyntacticMatches, 3 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 53 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=40, Invalid=116, Unknown=0, NotChecked=0, Total=156 [2023-11-06 20:59:29,552 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 7 mSDsluCounter, 2 mSDsCounter, 0 mSdLazyCounter, 16 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 5 SdHoareTripleChecker+Invalid, 24 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 16 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-06 20:59:29,554 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [7 Valid, 5 Invalid, 24 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 16 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-06 20:59:29,555 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2023-11-06 20:59:29,560 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2023-11-06 20:59:29,560 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 14 states, 13 states have (on average 1.2307692307692308) internal successors, (16), 13 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 20:59:29,561 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 16 transitions. [2023-11-06 20:59:29,561 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 16 transitions. Word has length 11 [2023-11-06 20:59:29,562 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-06 20:59:29,562 INFO L495 AbstractCegarLoop]: Abstraction has 14 states and 16 transitions. [2023-11-06 20:59:29,562 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 1.875) internal successors, (15), 8 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 20:59:29,562 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 16 transitions. [2023-11-06 20:59:29,563 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2023-11-06 20:59:29,563 INFO L187 NwaCegarLoop]: Found error trace [2023-11-06 20:59:29,563 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1] [2023-11-06 20:59:29,576 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_372a6d0b-1092-416f-8d67-3de7f49ec30d/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2023-11-06 20:59:29,769 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_372a6d0b-1092-416f-8d67-3de7f49ec30d/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-06 20:59:29,769 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-06 20:59:29,769 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-11-06 20:59:29,770 INFO L85 PathProgramCache]: Analyzing trace with hash -1393853687, now seen corresponding path program 3 times [2023-11-06 20:59:29,770 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-06 20:59:29,771 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1855807988] [2023-11-06 20:59:29,771 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 20:59:29,772 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-06 20:59:29,804 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 20:59:30,441 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 20:59:30,441 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-06 20:59:30,441 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1855807988] [2023-11-06 20:59:30,442 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1855807988] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-06 20:59:30,442 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [769337348] [2023-11-06 20:59:30,442 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-11-06 20:59:30,442 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-06 20:59:30,442 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_372a6d0b-1092-416f-8d67-3de7f49ec30d/bin/utaipan-verify-FOvIYxoinp/z3 [2023-11-06 20:59:30,447 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_372a6d0b-1092-416f-8d67-3de7f49ec30d/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-06 20:59:30,453 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_372a6d0b-1092-416f-8d67-3de7f49ec30d/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-11-06 20:59:30,516 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-11-06 20:59:30,516 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-06 20:59:30,518 INFO L262 TraceCheckSpWp]: Trace formula consists of 92 conjuncts, 32 conjunts are in the unsatisfiable core [2023-11-06 20:59:30,523 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-06 20:59:30,571 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 15 treesize of output 1 [2023-11-06 20:59:30,643 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 20:59:30,643 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-06 20:59:30,805 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2023-11-06 20:59:30,806 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [769337348] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-06 20:59:30,807 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1715968080] [2023-11-06 20:59:30,813 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2023-11-06 20:59:30,813 INFO L166 IcfgInterpreter]: Building call graph [2023-11-06 20:59:30,813 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-06 20:59:30,813 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-06 20:59:30,814 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-06 20:59:31,147 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-06 20:59:31,387 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '432#(and (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (not (= |ULTIMATE.start_main_~sum~0#1| 0)) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0))' at error location [2023-11-06 20:59:31,387 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-06 20:59:31,388 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-06 20:59:31,388 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 9] total 18 [2023-11-06 20:59:31,388 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1038439629] [2023-11-06 20:59:31,388 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-06 20:59:31,389 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2023-11-06 20:59:31,389 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-06 20:59:31,389 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2023-11-06 20:59:31,390 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=439, Unknown=0, NotChecked=0, Total=506 [2023-11-06 20:59:31,390 INFO L87 Difference]: Start difference. First operand 14 states and 16 transitions. Second operand has 18 states, 18 states have (on average 1.2777777777777777) internal successors, (23), 18 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 20:59:31,537 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-06 20:59:31,537 INFO L93 Difference]: Finished difference Result 21 states and 24 transitions. [2023-11-06 20:59:31,538 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2023-11-06 20:59:31,538 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 1.2777777777777777) internal successors, (23), 18 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 13 [2023-11-06 20:59:31,538 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-06 20:59:31,539 INFO L225 Difference]: With dead ends: 21 [2023-11-06 20:59:31,539 INFO L226 Difference]: Without dead ends: 18 [2023-11-06 20:59:31,539 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 28 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 107 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=73, Invalid=479, Unknown=0, NotChecked=0, Total=552 [2023-11-06 20:59:31,540 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 3 mSDsluCounter, 20 mSDsCounter, 0 mSdLazyCounter, 143 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 23 SdHoareTripleChecker+Invalid, 144 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 143 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-06 20:59:31,540 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [3 Valid, 23 Invalid, 144 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 143 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-06 20:59:31,541 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2023-11-06 20:59:31,544 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 16. [2023-11-06 20:59:31,545 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 20:59:31,545 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 19 transitions. [2023-11-06 20:59:31,545 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 19 transitions. Word has length 13 [2023-11-06 20:59:31,546 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-06 20:59:31,546 INFO L495 AbstractCegarLoop]: Abstraction has 16 states and 19 transitions. [2023-11-06 20:59:31,546 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 18 states have (on average 1.2777777777777777) internal successors, (23), 18 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 20:59:31,546 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 19 transitions. [2023-11-06 20:59:31,547 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2023-11-06 20:59:31,547 INFO L187 NwaCegarLoop]: Found error trace [2023-11-06 20:59:31,547 INFO L195 NwaCegarLoop]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1, 1] [2023-11-06 20:59:31,557 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_372a6d0b-1092-416f-8d67-3de7f49ec30d/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2023-11-06 20:59:31,752 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_372a6d0b-1092-416f-8d67-3de7f49ec30d/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-06 20:59:31,753 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-06 20:59:31,753 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-11-06 20:59:31,753 INFO L85 PathProgramCache]: Analyzing trace with hash -144867492, now seen corresponding path program 4 times [2023-11-06 20:59:31,753 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-06 20:59:31,753 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1151562559] [2023-11-06 20:59:31,754 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 20:59:31,754 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-06 20:59:31,767 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 20:59:31,848 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 4 proven. 5 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2023-11-06 20:59:31,848 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-06 20:59:31,848 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1151562559] [2023-11-06 20:59:31,849 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1151562559] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-06 20:59:31,849 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1565292079] [2023-11-06 20:59:31,849 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-11-06 20:59:31,849 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-06 20:59:31,849 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_372a6d0b-1092-416f-8d67-3de7f49ec30d/bin/utaipan-verify-FOvIYxoinp/z3 [2023-11-06 20:59:31,851 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_372a6d0b-1092-416f-8d67-3de7f49ec30d/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-06 20:59:31,870 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_372a6d0b-1092-416f-8d67-3de7f49ec30d/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-11-06 20:59:31,916 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 20:59:31,917 INFO L262 TraceCheckSpWp]: Trace formula consists of 97 conjuncts, 8 conjunts are in the unsatisfiable core [2023-11-06 20:59:31,919 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-06 20:59:31,977 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2023-11-06 20:59:31,977 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-06 20:59:32,019 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2023-11-06 20:59:32,019 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1565292079] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-06 20:59:32,020 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [925050710] [2023-11-06 20:59:32,022 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2023-11-06 20:59:32,022 INFO L166 IcfgInterpreter]: Building call graph [2023-11-06 20:59:32,022 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-06 20:59:32,023 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-06 20:59:32,023 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-06 20:59:32,295 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-06 20:59:32,456 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '591#(and (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (not (= |ULTIMATE.start_main_~sum~0#1| 0)) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0))' at error location [2023-11-06 20:59:32,456 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-06 20:59:32,456 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-06 20:59:32,457 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8] total 13 [2023-11-06 20:59:32,457 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [345121097] [2023-11-06 20:59:32,457 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-06 20:59:32,458 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2023-11-06 20:59:32,458 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-06 20:59:32,458 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2023-11-06 20:59:32,459 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=62, Invalid=244, Unknown=0, NotChecked=0, Total=306 [2023-11-06 20:59:32,459 INFO L87 Difference]: Start difference. First operand 16 states and 19 transitions. Second operand has 13 states, 13 states have (on average 1.6153846153846154) internal successors, (21), 13 states have internal predecessors, (21), 0 states have call successors, (0), 0 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 20:59:32,517 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-06 20:59:32,517 INFO L93 Difference]: Finished difference Result 30 states and 36 transitions. [2023-11-06 20:59:32,518 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2023-11-06 20:59:32,518 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 1.6153846153846154) internal successors, (21), 13 states have internal predecessors, (21), 0 states have call successors, (0), 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 20:59:32,518 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-06 20:59:32,519 INFO L225 Difference]: With dead ends: 30 [2023-11-06 20:59:32,519 INFO L226 Difference]: Without dead ends: 17 [2023-11-06 20:59:32,519 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 28 SyntacticMatches, 4 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 101 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=62, Invalid=244, Unknown=0, NotChecked=0, Total=306 [2023-11-06 20:59:32,520 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 4 mSDsluCounter, 10 mSDsCounter, 0 mSdLazyCounter, 57 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4 SdHoareTripleChecker+Valid, 13 SdHoareTripleChecker+Invalid, 67 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 57 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-06 20:59:32,521 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [4 Valid, 13 Invalid, 67 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 57 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-06 20:59:32,521 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2023-11-06 20:59:32,527 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2023-11-06 20:59:32,527 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 17 states, 16 states have (on average 1.25) internal successors, (20), 16 states have internal predecessors, (20), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 20:59:32,528 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 20 transitions. [2023-11-06 20:59:32,528 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 20 transitions. Word has length 14 [2023-11-06 20:59:32,528 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-06 20:59:32,528 INFO L495 AbstractCegarLoop]: Abstraction has 17 states and 20 transitions. [2023-11-06 20:59:32,529 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 1.6153846153846154) internal successors, (21), 13 states have internal predecessors, (21), 0 states have call successors, (0), 0 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 20:59:32,529 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 20 transitions. [2023-11-06 20:59:32,530 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2023-11-06 20:59:32,530 INFO L187 NwaCegarLoop]: Found error trace [2023-11-06 20:59:32,530 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 2, 1, 1, 1, 1, 1, 1, 1] [2023-11-06 20:59:32,541 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_372a6d0b-1092-416f-8d67-3de7f49ec30d/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2023-11-06 20:59:32,736 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_372a6d0b-1092-416f-8d67-3de7f49ec30d/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2023-11-06 20:59:32,736 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-06 20:59:32,736 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-11-06 20:59:32,737 INFO L85 PathProgramCache]: Analyzing trace with hash 34113338, now seen corresponding path program 5 times [2023-11-06 20:59:32,737 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-06 20:59:32,737 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [105229382] [2023-11-06 20:59:32,737 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 20:59:32,737 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-06 20:59:32,764 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 20:59:32,870 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 1 proven. 8 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-11-06 20:59:32,870 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-06 20:59:32,871 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [105229382] [2023-11-06 20:59:32,872 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [105229382] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-06 20:59:32,873 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2041211145] [2023-11-06 20:59:32,874 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-11-06 20:59:32,874 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-06 20:59:32,874 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_372a6d0b-1092-416f-8d67-3de7f49ec30d/bin/utaipan-verify-FOvIYxoinp/z3 [2023-11-06 20:59:32,875 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_372a6d0b-1092-416f-8d67-3de7f49ec30d/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-06 20:59:32,898 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_372a6d0b-1092-416f-8d67-3de7f49ec30d/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-11-06 20:59:32,949 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2023-11-06 20:59:32,949 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-06 20:59:32,951 INFO L262 TraceCheckSpWp]: Trace formula consists of 106 conjuncts, 8 conjunts are in the unsatisfiable core [2023-11-06 20:59:32,954 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-06 20:59:33,022 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 3 proven. 6 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-11-06 20:59:33,023 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-06 20:59:33,093 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 3 proven. 6 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-11-06 20:59:33,093 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2041211145] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-06 20:59:33,093 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1914150103] [2023-11-06 20:59:33,096 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2023-11-06 20:59:33,096 INFO L166 IcfgInterpreter]: Building call graph [2023-11-06 20:59:33,096 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-06 20:59:33,097 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-06 20:59:33,097 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-06 20:59:33,381 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-06 20:59:33,539 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '775#(and (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (not (= |ULTIMATE.start_main_~sum~0#1| 0)) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0))' at error location [2023-11-06 20:59:33,539 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-06 20:59:33,539 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-06 20:59:33,539 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 14 [2023-11-06 20:59:33,540 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1006317912] [2023-11-06 20:59:33,540 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-06 20:59:33,540 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2023-11-06 20:59:33,541 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-06 20:59:33,541 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2023-11-06 20:59:33,542 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=66, Invalid=276, Unknown=0, NotChecked=0, Total=342 [2023-11-06 20:59:33,542 INFO L87 Difference]: Start difference. First operand 17 states and 20 transitions. Second operand has 14 states, 14 states have (on average 1.5) internal successors, (21), 14 states have internal predecessors, (21), 0 states have call successors, (0), 0 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 20:59:33,618 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-06 20:59:33,619 INFO L93 Difference]: Finished difference Result 24 states and 28 transitions. [2023-11-06 20:59:33,619 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2023-11-06 20:59:33,619 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 1.5) internal successors, (21), 14 states have internal predecessors, (21), 0 states have call successors, (0), 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 20:59:33,620 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-06 20:59:33,620 INFO L225 Difference]: With dead ends: 24 [2023-11-06 20:59:33,620 INFO L226 Difference]: Without dead ends: 17 [2023-11-06 20:59:33,621 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 29 SyntacticMatches, 6 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 146 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=72, Invalid=308, Unknown=0, NotChecked=0, Total=380 [2023-11-06 20:59:33,622 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 5 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 66 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 15 SdHoareTripleChecker+Invalid, 73 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 66 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-06 20:59:33,622 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [5 Valid, 15 Invalid, 73 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 66 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-06 20:59:33,623 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2023-11-06 20:59:33,627 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2023-11-06 20:59:33,627 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 17 states, 16 states have (on average 1.1875) internal successors, (19), 16 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 20:59:33,628 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 19 transitions. [2023-11-06 20:59:33,628 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 19 transitions. Word has length 15 [2023-11-06 20:59:33,628 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-06 20:59:33,628 INFO L495 AbstractCegarLoop]: Abstraction has 17 states and 19 transitions. [2023-11-06 20:59:33,628 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 1.5) internal successors, (21), 14 states have internal predecessors, (21), 0 states have call successors, (0), 0 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 20:59:33,628 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 19 transitions. [2023-11-06 20:59:33,629 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2023-11-06 20:59:33,629 INFO L187 NwaCegarLoop]: Found error trace [2023-11-06 20:59:33,629 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 1, 1, 1, 1, 1, 1, 1] [2023-11-06 20:59:33,636 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_372a6d0b-1092-416f-8d67-3de7f49ec30d/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2023-11-06 20:59:33,829 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_372a6d0b-1092-416f-8d67-3de7f49ec30d/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-06 20:59:33,830 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-06 20:59:33,830 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-11-06 20:59:33,830 INFO L85 PathProgramCache]: Analyzing trace with hash 1057326073, now seen corresponding path program 6 times [2023-11-06 20:59:33,830 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-06 20:59:33,831 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [696406493] [2023-11-06 20:59:33,831 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 20:59:33,831 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-06 20:59:33,869 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 20:59:34,771 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 20:59:34,772 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-06 20:59:34,772 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [696406493] [2023-11-06 20:59:34,772 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [696406493] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-06 20:59:34,772 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1036056147] [2023-11-06 20:59:34,772 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-11-06 20:59:34,772 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-06 20:59:34,772 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_372a6d0b-1092-416f-8d67-3de7f49ec30d/bin/utaipan-verify-FOvIYxoinp/z3 [2023-11-06 20:59:34,774 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_372a6d0b-1092-416f-8d67-3de7f49ec30d/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-06 20:59:34,794 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_372a6d0b-1092-416f-8d67-3de7f49ec30d/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2023-11-06 20:59:34,844 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-11-06 20:59:34,845 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-06 20:59:34,846 INFO L262 TraceCheckSpWp]: Trace formula consists of 111 conjuncts, 42 conjunts are in the unsatisfiable core [2023-11-06 20:59:34,849 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-06 20:59:34,876 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 15 treesize of output 1 [2023-11-06 20:59:35,139 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 20:59:35,139 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-06 20:59:35,454 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-11-06 20:59:35,454 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1036056147] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-06 20:59:35,454 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2071778604] [2023-11-06 20:59:35,456 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2023-11-06 20:59:35,457 INFO L166 IcfgInterpreter]: Building call graph [2023-11-06 20:59:35,457 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-06 20:59:35,457 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-06 20:59:35,457 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-06 20:59:35,722 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-06 20:59:35,991 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '971#(and (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (not (= |ULTIMATE.start_main_~sum~0#1| 0)) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0))' at error location [2023-11-06 20:59:35,991 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-06 20:59:35,991 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-06 20:59:35,991 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 11] total 30 [2023-11-06 20:59:35,991 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1194805815] [2023-11-06 20:59:35,992 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-06 20:59:35,992 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 30 states [2023-11-06 20:59:35,992 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-06 20:59:35,993 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2023-11-06 20:59:35,993 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=117, Invalid=1073, Unknown=0, NotChecked=0, Total=1190 [2023-11-06 20:59:35,994 INFO L87 Difference]: Start difference. First operand 17 states and 19 transitions. Second operand has 30 states, 30 states have (on average 1.2333333333333334) internal successors, (37), 30 states have internal predecessors, (37), 0 states have call successors, (0), 0 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 20:59:36,333 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-06 20:59:36,333 INFO L93 Difference]: Finished difference Result 25 states and 28 transitions. [2023-11-06 20:59:36,334 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2023-11-06 20:59:36,334 INFO L78 Accepts]: Start accepts. Automaton has has 30 states, 30 states have (on average 1.2333333333333334) internal successors, (37), 30 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 16 [2023-11-06 20:59:36,334 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-06 20:59:36,335 INFO L225 Difference]: With dead ends: 25 [2023-11-06 20:59:36,335 INFO L226 Difference]: Without dead ends: 22 [2023-11-06 20:59:36,336 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 64 GetRequests, 28 SyntacticMatches, 0 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 373 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=139, Invalid=1267, Unknown=0, NotChecked=0, Total=1406 [2023-11-06 20:59:36,336 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 5 mSDsluCounter, 26 mSDsCounter, 0 mSdLazyCounter, 242 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 29 SdHoareTripleChecker+Invalid, 244 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 242 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-06 20:59:36,337 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [5 Valid, 29 Invalid, 244 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 242 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-11-06 20:59:36,337 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2023-11-06 20:59:36,341 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 19. [2023-11-06 20:59:36,342 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19 states, 18 states have (on average 1.2222222222222223) internal successors, (22), 18 states have internal predecessors, (22), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 20:59:36,344 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 22 transitions. [2023-11-06 20:59:36,345 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 22 transitions. Word has length 16 [2023-11-06 20:59:36,345 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-06 20:59:36,345 INFO L495 AbstractCegarLoop]: Abstraction has 19 states and 22 transitions. [2023-11-06 20:59:36,345 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 30 states, 30 states have (on average 1.2333333333333334) internal successors, (37), 30 states have internal predecessors, (37), 0 states have call successors, (0), 0 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 20:59:36,346 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 22 transitions. [2023-11-06 20:59:36,346 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2023-11-06 20:59:36,346 INFO L187 NwaCegarLoop]: Found error trace [2023-11-06 20:59:36,346 INFO L195 NwaCegarLoop]: trace histogram [4, 3, 3, 1, 1, 1, 1, 1, 1, 1] [2023-11-06 20:59:36,354 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_372a6d0b-1092-416f-8d67-3de7f49ec30d/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2023-11-06 20:59:36,553 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_372a6d0b-1092-416f-8d67-3de7f49ec30d/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable7 [2023-11-06 20:59:36,553 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-06 20:59:36,553 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-11-06 20:59:36,553 INFO L85 PathProgramCache]: Analyzing trace with hash 1985631240, now seen corresponding path program 7 times [2023-11-06 20:59:36,553 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-06 20:59:36,554 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2049197559] [2023-11-06 20:59:36,554 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 20:59:36,554 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-06 20:59:36,570 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 20:59:36,682 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 7 proven. 9 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-11-06 20:59:36,682 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-06 20:59:36,682 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2049197559] [2023-11-06 20:59:36,683 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2049197559] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-06 20:59:36,683 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [29805829] [2023-11-06 20:59:36,683 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-11-06 20:59:36,683 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-06 20:59:36,683 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_372a6d0b-1092-416f-8d67-3de7f49ec30d/bin/utaipan-verify-FOvIYxoinp/z3 [2023-11-06 20:59:36,684 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_372a6d0b-1092-416f-8d67-3de7f49ec30d/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-06 20:59:36,689 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_372a6d0b-1092-416f-8d67-3de7f49ec30d/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2023-11-06 20:59:36,762 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 20:59:36,763 INFO L262 TraceCheckSpWp]: Trace formula consists of 116 conjuncts, 10 conjunts are in the unsatisfiable core [2023-11-06 20:59:36,765 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-06 20:59:36,841 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 10 proven. 6 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-11-06 20:59:36,841 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-06 20:59:36,903 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 10 proven. 6 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-11-06 20:59:36,903 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [29805829] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-06 20:59:36,903 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1960046356] [2023-11-06 20:59:36,906 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2023-11-06 20:59:36,906 INFO L166 IcfgInterpreter]: Building call graph [2023-11-06 20:59:36,906 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-06 20:59:36,907 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-06 20:59:36,907 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-06 20:59:37,180 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-06 20:59:37,362 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1169#(and (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (not (= |ULTIMATE.start_main_~sum~0#1| 0)) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0))' at error location [2023-11-06 20:59:37,362 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-06 20:59:37,362 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-06 20:59:37,363 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10] total 16 [2023-11-06 20:59:37,363 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1078392956] [2023-11-06 20:59:37,363 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-06 20:59:37,363 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2023-11-06 20:59:37,364 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-06 20:59:37,364 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2023-11-06 20:59:37,365 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=89, Invalid=331, Unknown=0, NotChecked=0, Total=420 [2023-11-06 20:59:37,365 INFO L87 Difference]: Start difference. First operand 19 states and 22 transitions. Second operand has 16 states, 16 states have (on average 1.5) internal successors, (24), 16 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 20:59:37,445 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-06 20:59:37,445 INFO L93 Difference]: Finished difference Result 36 states and 42 transitions. [2023-11-06 20:59:37,447 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2023-11-06 20:59:37,447 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 1.5) internal successors, (24), 16 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 17 [2023-11-06 20:59:37,448 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-06 20:59:37,448 INFO L225 Difference]: With dead ends: 36 [2023-11-06 20:59:37,448 INFO L226 Difference]: Without dead ends: 20 [2023-11-06 20:59:37,449 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 59 GetRequests, 34 SyntacticMatches, 6 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 162 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=89, Invalid=331, Unknown=0, NotChecked=0, Total=420 [2023-11-06 20:59:37,450 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 4 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 68 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4 SdHoareTripleChecker+Valid, 15 SdHoareTripleChecker+Invalid, 78 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 68 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-06 20:59:37,450 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [4 Valid, 15 Invalid, 78 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 68 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-06 20:59:37,451 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2023-11-06 20:59:37,455 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2023-11-06 20:59:37,455 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20 states, 19 states have (on average 1.2105263157894737) internal successors, (23), 19 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 20:59:37,456 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 23 transitions. [2023-11-06 20:59:37,456 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 23 transitions. Word has length 17 [2023-11-06 20:59:37,456 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-06 20:59:37,456 INFO L495 AbstractCegarLoop]: Abstraction has 20 states and 23 transitions. [2023-11-06 20:59:37,456 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 1.5) internal successors, (24), 16 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 20:59:37,456 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 23 transitions. [2023-11-06 20:59:37,457 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2023-11-06 20:59:37,457 INFO L187 NwaCegarLoop]: Found error trace [2023-11-06 20:59:37,457 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 3, 1, 1, 1, 1, 1, 1, 1] [2023-11-06 20:59:37,465 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_372a6d0b-1092-416f-8d67-3de7f49ec30d/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2023-11-06 20:59:37,663 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_372a6d0b-1092-416f-8d67-3de7f49ec30d/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable8 [2023-11-06 20:59:37,664 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-06 20:59:37,664 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-11-06 20:59:37,664 INFO L85 PathProgramCache]: Analyzing trace with hash -345843862, now seen corresponding path program 8 times [2023-11-06 20:59:37,664 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-06 20:59:37,665 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [256813123] [2023-11-06 20:59:37,665 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 20:59:37,665 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-06 20:59:37,690 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 20:59:37,815 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 3 proven. 13 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2023-11-06 20:59:37,815 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-06 20:59:37,816 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [256813123] [2023-11-06 20:59:37,816 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [256813123] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-06 20:59:37,816 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1024929040] [2023-11-06 20:59:37,816 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-11-06 20:59:37,816 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-06 20:59:37,816 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_372a6d0b-1092-416f-8d67-3de7f49ec30d/bin/utaipan-verify-FOvIYxoinp/z3 [2023-11-06 20:59:37,817 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_372a6d0b-1092-416f-8d67-3de7f49ec30d/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-06 20:59:37,824 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_372a6d0b-1092-416f-8d67-3de7f49ec30d/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2023-11-06 20:59:37,891 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2023-11-06 20:59:37,891 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-06 20:59:37,893 INFO L262 TraceCheckSpWp]: Trace formula consists of 125 conjuncts, 10 conjunts are in the unsatisfiable core [2023-11-06 20:59:37,894 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-06 20:59:37,980 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 6 proven. 10 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2023-11-06 20:59:37,980 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-06 20:59:38,065 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 6 proven. 10 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2023-11-06 20:59:38,065 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1024929040] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-06 20:59:38,066 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [729380625] [2023-11-06 20:59:38,069 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2023-11-06 20:59:38,069 INFO L166 IcfgInterpreter]: Building call graph [2023-11-06 20:59:38,070 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-06 20:59:38,070 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-06 20:59:38,070 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-06 20:59:38,309 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-06 20:59:38,455 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1392#(and (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (not (= |ULTIMATE.start_main_~sum~0#1| 0)) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0))' at error location [2023-11-06 20:59:38,455 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-06 20:59:38,455 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-06 20:59:38,455 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 17 [2023-11-06 20:59:38,455 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [533862443] [2023-11-06 20:59:38,456 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-06 20:59:38,456 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2023-11-06 20:59:38,456 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-06 20:59:38,457 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2023-11-06 20:59:38,457 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=87, Invalid=375, Unknown=0, NotChecked=0, Total=462 [2023-11-06 20:59:38,458 INFO L87 Difference]: Start difference. First operand 20 states and 23 transitions. Second operand has 17 states, 17 states have (on average 1.411764705882353) internal successors, (24), 17 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 20:59:38,551 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-06 20:59:38,552 INFO L93 Difference]: Finished difference Result 28 states and 32 transitions. [2023-11-06 20:59:38,553 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2023-11-06 20:59:38,553 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 1.411764705882353) internal successors, (24), 17 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 18 [2023-11-06 20:59:38,553 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-06 20:59:38,554 INFO L225 Difference]: With dead ends: 28 [2023-11-06 20:59:38,554 INFO L226 Difference]: Without dead ends: 20 [2023-11-06 20:59:38,554 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 64 GetRequests, 35 SyntacticMatches, 8 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 229 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=94, Invalid=412, Unknown=0, NotChecked=0, Total=506 [2023-11-06 20:59:38,555 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 5 mSDsluCounter, 8 mSDsCounter, 0 mSdLazyCounter, 60 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 11 SdHoareTripleChecker+Invalid, 73 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 60 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-06 20:59:38,556 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [5 Valid, 11 Invalid, 73 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 60 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-06 20:59:38,556 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2023-11-06 20:59:38,561 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2023-11-06 20:59:38,561 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20 states, 19 states have (on average 1.1578947368421053) internal successors, (22), 19 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 20:59:38,561 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 22 transitions. [2023-11-06 20:59:38,562 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 22 transitions. Word has length 18 [2023-11-06 20:59:38,562 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-06 20:59:38,562 INFO L495 AbstractCegarLoop]: Abstraction has 20 states and 22 transitions. [2023-11-06 20:59:38,562 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 17 states have (on average 1.411764705882353) internal successors, (24), 17 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 20:59:38,563 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 22 transitions. [2023-11-06 20:59:38,563 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2023-11-06 20:59:38,563 INFO L187 NwaCegarLoop]: Found error trace [2023-11-06 20:59:38,563 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 4, 1, 1, 1, 1, 1, 1, 1] [2023-11-06 20:59:38,569 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_372a6d0b-1092-416f-8d67-3de7f49ec30d/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2023-11-06 20:59:38,769 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_372a6d0b-1092-416f-8d67-3de7f49ec30d/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-06 20:59:38,770 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-06 20:59:38,770 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-11-06 20:59:38,770 INFO L85 PathProgramCache]: Analyzing trace with hash -2131412535, now seen corresponding path program 9 times [2023-11-06 20:59:38,771 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-06 20:59:38,771 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2012623193] [2023-11-06 20:59:38,771 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 20:59:38,771 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-06 20:59:38,830 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 20:59:39,918 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-06 20:59:39,918 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-06 20:59:39,918 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2012623193] [2023-11-06 20:59:39,918 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2012623193] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-06 20:59:39,919 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [844203777] [2023-11-06 20:59:39,919 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-11-06 20:59:39,919 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-06 20:59:39,919 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_372a6d0b-1092-416f-8d67-3de7f49ec30d/bin/utaipan-verify-FOvIYxoinp/z3 [2023-11-06 20:59:39,923 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_372a6d0b-1092-416f-8d67-3de7f49ec30d/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-06 20:59:39,932 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_372a6d0b-1092-416f-8d67-3de7f49ec30d/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2023-11-06 20:59:40,003 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-11-06 20:59:40,003 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-06 20:59:40,005 INFO L262 TraceCheckSpWp]: Trace formula consists of 130 conjuncts, 54 conjunts are in the unsatisfiable core [2023-11-06 20:59:40,008 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-06 20:59:40,049 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 15 treesize of output 1 [2023-11-06 20:59:40,436 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-06 20:59:40,436 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-06 20:59:40,911 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2023-11-06 20:59:40,912 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [844203777] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-06 20:59:40,912 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [633718737] [2023-11-06 20:59:40,914 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2023-11-06 20:59:40,914 INFO L166 IcfgInterpreter]: Building call graph [2023-11-06 20:59:40,915 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-06 20:59:40,915 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-06 20:59:40,915 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-06 20:59:41,165 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-06 20:59:41,444 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1627#(and (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (not (= |ULTIMATE.start_main_~sum~0#1| 0)) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0))' at error location [2023-11-06 20:59:41,444 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-06 20:59:41,444 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-06 20:59:41,444 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18, 13] total 37 [2023-11-06 20:59:41,445 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1063064633] [2023-11-06 20:59:41,445 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-06 20:59:41,445 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 37 states [2023-11-06 20:59:41,445 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-06 20:59:41,446 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2023-11-06 20:59:41,447 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=143, Invalid=1579, Unknown=0, NotChecked=0, Total=1722 [2023-11-06 20:59:41,448 INFO L87 Difference]: Start difference. First operand 20 states and 22 transitions. Second operand has 37 states, 37 states have (on average 1.1891891891891893) internal successors, (44), 37 states have internal predecessors, (44), 0 states have call successors, (0), 0 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 20:59:42,000 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-06 20:59:42,001 INFO L93 Difference]: Finished difference Result 29 states and 32 transitions. [2023-11-06 20:59:42,002 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2023-11-06 20:59:42,002 INFO L78 Accepts]: Start accepts. Automaton has has 37 states, 37 states have (on average 1.1891891891891893) internal successors, (44), 37 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 19 [2023-11-06 20:59:42,002 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-06 20:59:42,003 INFO L225 Difference]: With dead ends: 29 [2023-11-06 20:59:42,003 INFO L226 Difference]: Without dead ends: 26 [2023-11-06 20:59:42,004 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 77 GetRequests, 33 SyntacticMatches, 0 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 520 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=174, Invalid=1896, Unknown=0, NotChecked=0, Total=2070 [2023-11-06 20:59:42,005 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 4 mSDsluCounter, 48 mSDsCounter, 0 mSdLazyCounter, 485 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4 SdHoareTripleChecker+Valid, 51 SdHoareTripleChecker+Invalid, 487 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 485 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2023-11-06 20:59:42,005 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [4 Valid, 51 Invalid, 487 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 485 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2023-11-06 20:59:42,006 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2023-11-06 20:59:42,011 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 22. [2023-11-06 20:59:42,012 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22 states, 21 states have (on average 1.1904761904761905) internal successors, (25), 21 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 20:59:42,012 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 25 transitions. [2023-11-06 20:59:42,012 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 25 transitions. Word has length 19 [2023-11-06 20:59:42,012 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-06 20:59:42,012 INFO L495 AbstractCegarLoop]: Abstraction has 22 states and 25 transitions. [2023-11-06 20:59:42,013 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 37 states, 37 states have (on average 1.1891891891891893) internal successors, (44), 37 states have internal predecessors, (44), 0 states have call successors, (0), 0 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 20:59:42,013 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 25 transitions. [2023-11-06 20:59:42,013 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2023-11-06 20:59:42,014 INFO L187 NwaCegarLoop]: Found error trace [2023-11-06 20:59:42,014 INFO L195 NwaCegarLoop]: trace histogram [5, 4, 4, 1, 1, 1, 1, 1, 1, 1] [2023-11-06 20:59:42,019 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_372a6d0b-1092-416f-8d67-3de7f49ec30d/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Ended with exit code 0 [2023-11-06 20:59:42,218 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_372a6d0b-1092-416f-8d67-3de7f49ec30d/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2023-11-06 20:59:42,218 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-06 20:59:42,219 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-11-06 20:59:42,219 INFO L85 PathProgramCache]: Analyzing trace with hash 1598262300, now seen corresponding path program 10 times [2023-11-06 20:59:42,219 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-06 20:59:42,219 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [861964366] [2023-11-06 20:59:42,219 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 20:59:42,219 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-06 20:59:42,233 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 20:59:42,379 INFO L134 CoverageAnalysis]: Checked inductivity of 35 backedges. 11 proven. 14 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2023-11-06 20:59:42,379 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-06 20:59:42,379 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [861964366] [2023-11-06 20:59:42,380 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [861964366] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-06 20:59:42,380 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [582244709] [2023-11-06 20:59:42,380 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-11-06 20:59:42,380 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-06 20:59:42,380 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_372a6d0b-1092-416f-8d67-3de7f49ec30d/bin/utaipan-verify-FOvIYxoinp/z3 [2023-11-06 20:59:42,381 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_372a6d0b-1092-416f-8d67-3de7f49ec30d/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-06 20:59:42,390 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_372a6d0b-1092-416f-8d67-3de7f49ec30d/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2023-11-06 20:59:42,463 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 20:59:42,464 INFO L262 TraceCheckSpWp]: Trace formula consists of 135 conjuncts, 12 conjunts are in the unsatisfiable core [2023-11-06 20:59:42,466 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-06 20:59:42,574 INFO L134 CoverageAnalysis]: Checked inductivity of 35 backedges. 15 proven. 10 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2023-11-06 20:59:42,575 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-06 20:59:42,649 INFO L134 CoverageAnalysis]: Checked inductivity of 35 backedges. 15 proven. 10 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2023-11-06 20:59:42,650 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [582244709] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-06 20:59:42,650 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1158315976] [2023-11-06 20:59:42,651 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2023-11-06 20:59:42,652 INFO L166 IcfgInterpreter]: Building call graph [2023-11-06 20:59:42,652 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-06 20:59:42,652 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-06 20:59:42,652 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-06 20:59:42,872 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-06 20:59:43,042 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1862#(and (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (not (= |ULTIMATE.start_main_~sum~0#1| 0)) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0))' at error location [2023-11-06 20:59:43,042 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-06 20:59:43,042 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-06 20:59:43,042 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12] total 19 [2023-11-06 20:59:43,043 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1731917876] [2023-11-06 20:59:43,043 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-06 20:59:43,043 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2023-11-06 20:59:43,043 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-06 20:59:43,044 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2023-11-06 20:59:43,044 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=110, Invalid=442, Unknown=0, NotChecked=0, Total=552 [2023-11-06 20:59:43,044 INFO L87 Difference]: Start difference. First operand 22 states and 25 transitions. Second operand has 19 states, 19 states have (on average 1.4210526315789473) internal successors, (27), 19 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 20:59:43,121 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-06 20:59:43,121 INFO L93 Difference]: Finished difference Result 42 states and 48 transitions. [2023-11-06 20:59:43,121 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2023-11-06 20:59:43,122 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 1.4210526315789473) internal successors, (27), 19 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2023-11-06 20:59:43,122 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-06 20:59:43,122 INFO L225 Difference]: With dead ends: 42 [2023-11-06 20:59:43,122 INFO L226 Difference]: Without dead ends: 23 [2023-11-06 20:59:43,123 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 70 GetRequests, 40 SyntacticMatches, 8 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 227 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=110, Invalid=442, Unknown=0, NotChecked=0, Total=552 [2023-11-06 20:59:43,123 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 6 mSDsluCounter, 8 mSDsCounter, 0 mSdLazyCounter, 94 mSolverCounterSat, 15 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 11 SdHoareTripleChecker+Invalid, 109 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 15 IncrementalHoareTripleChecker+Valid, 94 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-06 20:59:43,124 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [6 Valid, 11 Invalid, 109 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [15 Valid, 94 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-06 20:59:43,124 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2023-11-06 20:59:43,130 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2023-11-06 20:59:43,130 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 23 states, 22 states have (on average 1.1818181818181819) internal successors, (26), 22 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 20:59:43,131 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 26 transitions. [2023-11-06 20:59:43,131 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 26 transitions. Word has length 20 [2023-11-06 20:59:43,131 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-06 20:59:43,131 INFO L495 AbstractCegarLoop]: Abstraction has 23 states and 26 transitions. [2023-11-06 20:59:43,132 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 19 states have (on average 1.4210526315789473) internal successors, (27), 19 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 20:59:43,132 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 26 transitions. [2023-11-06 20:59:43,132 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2023-11-06 20:59:43,133 INFO L187 NwaCegarLoop]: Found error trace [2023-11-06 20:59:43,133 INFO L195 NwaCegarLoop]: trace histogram [5, 5, 4, 1, 1, 1, 1, 1, 1, 1] [2023-11-06 20:59:43,144 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_372a6d0b-1092-416f-8d67-3de7f49ec30d/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2023-11-06 20:59:43,338 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_372a6d0b-1092-416f-8d67-3de7f49ec30d/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-06 20:59:43,338 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-06 20:59:43,339 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-11-06 20:59:43,339 INFO L85 PathProgramCache]: Analyzing trace with hash -1460357766, now seen corresponding path program 11 times [2023-11-06 20:59:43,339 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-06 20:59:43,339 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1901315005] [2023-11-06 20:59:43,339 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 20:59:43,339 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-06 20:59:43,354 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 20:59:43,521 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 6 proven. 19 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2023-11-06 20:59:43,522 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-06 20:59:43,522 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1901315005] [2023-11-06 20:59:43,522 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1901315005] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-06 20:59:43,522 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1060539842] [2023-11-06 20:59:43,522 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-11-06 20:59:43,523 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-06 20:59:43,523 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_372a6d0b-1092-416f-8d67-3de7f49ec30d/bin/utaipan-verify-FOvIYxoinp/z3 [2023-11-06 20:59:43,524 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_372a6d0b-1092-416f-8d67-3de7f49ec30d/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-06 20:59:43,550 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_372a6d0b-1092-416f-8d67-3de7f49ec30d/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2023-11-06 20:59:43,631 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2023-11-06 20:59:43,632 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-06 20:59:43,633 INFO L262 TraceCheckSpWp]: Trace formula consists of 144 conjuncts, 12 conjunts are in the unsatisfiable core [2023-11-06 20:59:43,635 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-06 20:59:43,750 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 10 proven. 15 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2023-11-06 20:59:43,750 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-06 20:59:43,855 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 10 proven. 15 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2023-11-06 20:59:43,855 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1060539842] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-06 20:59:43,855 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [957100743] [2023-11-06 20:59:43,858 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2023-11-06 20:59:43,859 INFO L166 IcfgInterpreter]: Building call graph [2023-11-06 20:59:43,859 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-06 20:59:43,859 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-06 20:59:43,859 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-06 20:59:44,086 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-06 20:59:44,258 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2124#(and (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (not (= |ULTIMATE.start_main_~sum~0#1| 0)) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0))' at error location [2023-11-06 20:59:44,258 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-06 20:59:44,258 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-06 20:59:44,259 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 20 [2023-11-06 20:59:44,259 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [328642866] [2023-11-06 20:59:44,259 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-06 20:59:44,259 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2023-11-06 20:59:44,259 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-06 20:59:44,260 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2023-11-06 20:59:44,260 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=114, Invalid=486, Unknown=0, NotChecked=0, Total=600 [2023-11-06 20:59:44,261 INFO L87 Difference]: Start difference. First operand 23 states and 26 transitions. Second operand has 20 states, 20 states have (on average 1.35) internal successors, (27), 20 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 20:59:44,347 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-06 20:59:44,347 INFO L93 Difference]: Finished difference Result 32 states and 36 transitions. [2023-11-06 20:59:44,348 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2023-11-06 20:59:44,348 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 1.35) internal successors, (27), 20 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2023-11-06 20:59:44,348 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-06 20:59:44,349 INFO L225 Difference]: With dead ends: 32 [2023-11-06 20:59:44,349 INFO L226 Difference]: Without dead ends: 23 [2023-11-06 20:59:44,349 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 75 GetRequests, 41 SyntacticMatches, 10 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 325 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=122, Invalid=528, Unknown=0, NotChecked=0, Total=650 [2023-11-06 20:59:44,350 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 5 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 87 mSolverCounterSat, 15 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 15 SdHoareTripleChecker+Invalid, 102 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 15 IncrementalHoareTripleChecker+Valid, 87 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-06 20:59:44,350 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [5 Valid, 15 Invalid, 102 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [15 Valid, 87 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-06 20:59:44,351 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2023-11-06 20:59:44,358 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2023-11-06 20:59:44,358 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 23 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 20:59:44,359 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 25 transitions. [2023-11-06 20:59:44,359 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 25 transitions. Word has length 21 [2023-11-06 20:59:44,361 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-06 20:59:44,361 INFO L495 AbstractCegarLoop]: Abstraction has 23 states and 25 transitions. [2023-11-06 20:59:44,361 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 20 states have (on average 1.35) internal successors, (27), 20 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 20:59:44,361 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 25 transitions. [2023-11-06 20:59:44,362 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2023-11-06 20:59:44,362 INFO L187 NwaCegarLoop]: Found error trace [2023-11-06 20:59:44,362 INFO L195 NwaCegarLoop]: trace histogram [5, 5, 5, 1, 1, 1, 1, 1, 1, 1] [2023-11-06 20:59:44,368 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_372a6d0b-1092-416f-8d67-3de7f49ec30d/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2023-11-06 20:59:44,568 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_372a6d0b-1092-416f-8d67-3de7f49ec30d/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2023-11-06 20:59:44,569 INFO L420 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-06 20:59:44,569 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-11-06 20:59:44,569 INFO L85 PathProgramCache]: Analyzing trace with hash 1973362105, now seen corresponding path program 12 times [2023-11-06 20:59:44,569 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-06 20:59:44,569 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [858824717] [2023-11-06 20:59:44,569 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 20:59:44,570 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-06 20:59:44,598 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 20:59:45,955 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-06 20:59:45,955 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-06 20:59:45,955 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [858824717] [2023-11-06 20:59:45,955 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [858824717] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-06 20:59:45,955 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1251146218] [2023-11-06 20:59:45,956 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-11-06 20:59:45,956 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-06 20:59:45,956 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_372a6d0b-1092-416f-8d67-3de7f49ec30d/bin/utaipan-verify-FOvIYxoinp/z3 [2023-11-06 20:59:45,957 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_372a6d0b-1092-416f-8d67-3de7f49ec30d/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-06 20:59:45,963 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_372a6d0b-1092-416f-8d67-3de7f49ec30d/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2023-11-06 20:59:46,046 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-11-06 20:59:46,047 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-06 20:59:46,048 INFO L262 TraceCheckSpWp]: Trace formula consists of 149 conjuncts, 62 conjunts are in the unsatisfiable core [2023-11-06 20:59:46,057 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-06 20:59:46,100 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 15 treesize of output 1 [2023-11-06 20:59:46,620 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-06 20:59:46,620 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-06 20:59:47,338 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2023-11-06 20:59:47,339 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1251146218] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-06 20:59:47,339 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1119727384] [2023-11-06 20:59:47,341 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2023-11-06 20:59:47,341 INFO L166 IcfgInterpreter]: Building call graph [2023-11-06 20:59:47,341 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-06 20:59:47,341 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-06 20:59:47,342 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-06 20:59:47,577 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-06 20:59:47,919 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2398#(and (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (not (= |ULTIMATE.start_main_~sum~0#1| 0)) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0))' at error location [2023-11-06 20:59:47,919 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-06 20:59:47,919 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-06 20:59:47,919 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21, 15] total 44 [2023-11-06 20:59:47,919 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1226577953] [2023-11-06 20:59:47,919 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-06 20:59:47,920 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 44 states [2023-11-06 20:59:47,920 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-06 20:59:47,921 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2023-11-06 20:59:47,922 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=164, Invalid=2188, Unknown=0, NotChecked=0, Total=2352 [2023-11-06 20:59:47,922 INFO L87 Difference]: Start difference. First operand 23 states and 25 transitions. Second operand has 44 states, 44 states have (on average 1.1590909090909092) internal successors, (51), 44 states have internal predecessors, (51), 0 states have call successors, (0), 0 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 20:59:48,754 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-06 20:59:48,754 INFO L93 Difference]: Finished difference Result 33 states and 36 transitions. [2023-11-06 20:59:48,755 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2023-11-06 20:59:48,755 INFO L78 Accepts]: Start accepts. Automaton has has 44 states, 44 states have (on average 1.1590909090909092) internal successors, (51), 44 states have internal predecessors, (51), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 22 [2023-11-06 20:59:48,755 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-06 20:59:48,755 INFO L225 Difference]: With dead ends: 33 [2023-11-06 20:59:48,756 INFO L226 Difference]: Without dead ends: 30 [2023-11-06 20:59:48,757 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 92 GetRequests, 38 SyntacticMatches, 0 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 690 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=226, Invalid=2854, Unknown=0, NotChecked=0, Total=3080 [2023-11-06 20:59:48,758 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 4 mSDsluCounter, 60 mSDsCounter, 0 mSdLazyCounter, 663 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4 SdHoareTripleChecker+Valid, 63 SdHoareTripleChecker+Invalid, 665 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 663 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2023-11-06 20:59:48,758 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [4 Valid, 63 Invalid, 665 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 663 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2023-11-06 20:59:48,758 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2023-11-06 20:59:48,766 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 25. [2023-11-06 20:59:48,766 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 25 states, 24 states have (on average 1.1666666666666667) internal successors, (28), 24 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 20:59:48,767 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 28 transitions. [2023-11-06 20:59:48,767 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 28 transitions. Word has length 22 [2023-11-06 20:59:48,767 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-06 20:59:48,767 INFO L495 AbstractCegarLoop]: Abstraction has 25 states and 28 transitions. [2023-11-06 20:59:48,767 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 44 states, 44 states have (on average 1.1590909090909092) internal successors, (51), 44 states have internal predecessors, (51), 0 states have call successors, (0), 0 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 20:59:48,768 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 28 transitions. [2023-11-06 20:59:48,768 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2023-11-06 20:59:48,768 INFO L187 NwaCegarLoop]: Found error trace [2023-11-06 20:59:48,769 INFO L195 NwaCegarLoop]: trace histogram [6, 5, 5, 1, 1, 1, 1, 1, 1, 1] [2023-11-06 20:59:48,800 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_372a6d0b-1092-416f-8d67-3de7f49ec30d/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2023-11-06 20:59:48,975 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_372a6d0b-1092-416f-8d67-3de7f49ec30d/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2023-11-06 20:59:48,975 INFO L420 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-06 20:59:48,975 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-11-06 20:59:48,976 INFO L85 PathProgramCache]: Analyzing trace with hash -1355125048, now seen corresponding path program 13 times [2023-11-06 20:59:48,976 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-06 20:59:48,976 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [912345567] [2023-11-06 20:59:48,976 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 20:59:48,976 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-06 20:59:48,993 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 20:59:49,159 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 16 proven. 20 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2023-11-06 20:59:49,160 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-06 20:59:49,160 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [912345567] [2023-11-06 20:59:49,160 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [912345567] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-06 20:59:49,160 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1787776522] [2023-11-06 20:59:49,160 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-11-06 20:59:49,161 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-06 20:59:49,161 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_372a6d0b-1092-416f-8d67-3de7f49ec30d/bin/utaipan-verify-FOvIYxoinp/z3 [2023-11-06 20:59:49,165 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_372a6d0b-1092-416f-8d67-3de7f49ec30d/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-06 20:59:49,199 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_372a6d0b-1092-416f-8d67-3de7f49ec30d/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2023-11-06 20:59:49,263 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 20:59:49,265 INFO L262 TraceCheckSpWp]: Trace formula consists of 154 conjuncts, 14 conjunts are in the unsatisfiable core [2023-11-06 20:59:49,267 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-06 20:59:49,409 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 21 proven. 15 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2023-11-06 20:59:49,409 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-06 20:59:49,514 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 21 proven. 15 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2023-11-06 20:59:49,514 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1787776522] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-06 20:59:49,515 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2024811067] [2023-11-06 20:59:49,516 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2023-11-06 20:59:49,516 INFO L166 IcfgInterpreter]: Building call graph [2023-11-06 20:59:49,516 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-06 20:59:49,517 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-06 20:59:49,517 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-06 20:59:49,756 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-06 20:59:49,920 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2674#(and (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (not (= |ULTIMATE.start_main_~sum~0#1| 0)) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0))' at error location [2023-11-06 20:59:49,920 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-06 20:59:49,921 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-06 20:59:49,921 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14, 14] total 22 [2023-11-06 20:59:49,921 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [871844756] [2023-11-06 20:59:49,921 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-06 20:59:49,921 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2023-11-06 20:59:49,922 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-06 20:59:49,922 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2023-11-06 20:59:49,923 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=147, Invalid=555, Unknown=0, NotChecked=0, Total=702 [2023-11-06 20:59:49,923 INFO L87 Difference]: Start difference. First operand 25 states and 28 transitions. Second operand has 22 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 20:59:50,017 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-06 20:59:50,018 INFO L93 Difference]: Finished difference Result 48 states and 54 transitions. [2023-11-06 20:59:50,018 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2023-11-06 20:59:50,018 INFO L78 Accepts]: Start accepts. Automaton has has 22 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) Word has length 23 [2023-11-06 20:59:50,018 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-06 20:59:50,019 INFO L225 Difference]: With dead ends: 48 [2023-11-06 20:59:50,019 INFO L226 Difference]: Without dead ends: 26 [2023-11-06 20:59:50,020 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 81 GetRequests, 46 SyntacticMatches, 10 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 310 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=147, Invalid=555, Unknown=0, NotChecked=0, Total=702 [2023-11-06 20:59:50,021 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 4 mSDsluCounter, 16 mSDsCounter, 0 mSdLazyCounter, 109 mSolverCounterSat, 16 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4 SdHoareTripleChecker+Valid, 19 SdHoareTripleChecker+Invalid, 125 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 16 IncrementalHoareTripleChecker+Valid, 109 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-06 20:59:50,021 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [4 Valid, 19 Invalid, 125 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [16 Valid, 109 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-06 20:59:50,022 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2023-11-06 20:59:50,029 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2023-11-06 20:59:50,029 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26 states, 25 states have (on average 1.16) internal successors, (29), 25 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 20:59:50,030 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 29 transitions. [2023-11-06 20:59:50,030 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 29 transitions. Word has length 23 [2023-11-06 20:59:50,030 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-06 20:59:50,030 INFO L495 AbstractCegarLoop]: Abstraction has 26 states and 29 transitions. [2023-11-06 20:59:50,030 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 22 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 20:59:50,031 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 29 transitions. [2023-11-06 20:59:50,031 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2023-11-06 20:59:50,031 INFO L187 NwaCegarLoop]: Found error trace [2023-11-06 20:59:50,031 INFO L195 NwaCegarLoop]: trace histogram [6, 6, 5, 1, 1, 1, 1, 1, 1, 1] [2023-11-06 20:59:50,042 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_372a6d0b-1092-416f-8d67-3de7f49ec30d/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2023-11-06 20:59:50,237 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_372a6d0b-1092-416f-8d67-3de7f49ec30d/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2023-11-06 20:59:50,237 INFO L420 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-06 20:59:50,238 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-11-06 20:59:50,238 INFO L85 PathProgramCache]: Analyzing trace with hash 1320640682, now seen corresponding path program 14 times [2023-11-06 20:59:50,238 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-06 20:59:50,238 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [800416778] [2023-11-06 20:59:50,238 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 20:59:50,238 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-06 20:59:50,254 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 20:59:50,466 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 10 proven. 26 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2023-11-06 20:59:50,466 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-06 20:59:50,467 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [800416778] [2023-11-06 20:59:50,467 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [800416778] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-06 20:59:50,467 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [342176529] [2023-11-06 20:59:50,467 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-11-06 20:59:50,467 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-06 20:59:50,467 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_372a6d0b-1092-416f-8d67-3de7f49ec30d/bin/utaipan-verify-FOvIYxoinp/z3 [2023-11-06 20:59:50,468 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_372a6d0b-1092-416f-8d67-3de7f49ec30d/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-06 20:59:50,483 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_372a6d0b-1092-416f-8d67-3de7f49ec30d/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2023-11-06 20:59:50,592 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2023-11-06 20:59:50,593 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-06 20:59:50,594 INFO L262 TraceCheckSpWp]: Trace formula consists of 163 conjuncts, 14 conjunts are in the unsatisfiable core [2023-11-06 20:59:50,596 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-06 20:59:50,728 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 15 proven. 21 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2023-11-06 20:59:50,728 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-06 20:59:50,870 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 15 proven. 21 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2023-11-06 20:59:50,870 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [342176529] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-06 20:59:50,871 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [233934886] [2023-11-06 20:59:50,872 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2023-11-06 20:59:50,872 INFO L166 IcfgInterpreter]: Building call graph [2023-11-06 20:59:50,873 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-06 20:59:50,873 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-06 20:59:50,873 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-06 20:59:51,101 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-06 20:59:51,260 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2975#(and (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (not (= |ULTIMATE.start_main_~sum~0#1| 0)) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0))' at error location [2023-11-06 20:59:51,261 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-06 20:59:51,261 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-06 20:59:51,261 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15] total 23 [2023-11-06 20:59:51,261 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1542732777] [2023-11-06 20:59:51,261 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-06 20:59:51,261 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2023-11-06 20:59:51,261 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-06 20:59:51,262 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2023-11-06 20:59:51,262 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=144, Invalid=612, Unknown=0, NotChecked=0, Total=756 [2023-11-06 20:59:51,263 INFO L87 Difference]: Start difference. First operand 26 states and 29 transitions. Second operand has 23 states, 23 states have (on average 1.3043478260869565) internal successors, (30), 23 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 20:59:51,377 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-06 20:59:51,377 INFO L93 Difference]: Finished difference Result 36 states and 40 transitions. [2023-11-06 20:59:51,379 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2023-11-06 20:59:51,379 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 1.3043478260869565) internal successors, (30), 23 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) Word has length 24 [2023-11-06 20:59:51,379 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-06 20:59:51,379 INFO L225 Difference]: With dead ends: 36 [2023-11-06 20:59:51,379 INFO L226 Difference]: Without dead ends: 26 [2023-11-06 20:59:51,380 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 86 GetRequests, 47 SyntacticMatches, 12 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 437 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=153, Invalid=659, Unknown=0, NotChecked=0, Total=812 [2023-11-06 20:59:51,381 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 5 mSDsluCounter, 20 mSDsCounter, 0 mSdLazyCounter, 137 mSolverCounterSat, 16 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 23 SdHoareTripleChecker+Invalid, 153 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 16 IncrementalHoareTripleChecker+Valid, 137 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-06 20:59:51,381 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [5 Valid, 23 Invalid, 153 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [16 Valid, 137 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-06 20:59:51,381 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2023-11-06 20:59:51,389 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2023-11-06 20:59:51,389 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26 states, 25 states have (on average 1.12) internal successors, (28), 25 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 20:59:51,389 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 28 transitions. [2023-11-06 20:59:51,390 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 28 transitions. Word has length 24 [2023-11-06 20:59:51,390 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-06 20:59:51,390 INFO L495 AbstractCegarLoop]: Abstraction has 26 states and 28 transitions. [2023-11-06 20:59:51,390 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 23 states have (on average 1.3043478260869565) internal successors, (30), 23 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 20:59:51,391 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 28 transitions. [2023-11-06 20:59:51,391 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2023-11-06 20:59:51,391 INFO L187 NwaCegarLoop]: Found error trace [2023-11-06 20:59:51,391 INFO L195 NwaCegarLoop]: trace histogram [6, 6, 6, 1, 1, 1, 1, 1, 1, 1] [2023-11-06 20:59:51,398 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_372a6d0b-1092-416f-8d67-3de7f49ec30d/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2023-11-06 20:59:51,597 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_372a6d0b-1092-416f-8d67-3de7f49ec30d/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2023-11-06 20:59:51,598 INFO L420 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-06 20:59:51,598 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-11-06 20:59:51,598 INFO L85 PathProgramCache]: Analyzing trace with hash -2009999223, now seen corresponding path program 15 times [2023-11-06 20:59:51,598 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-06 20:59:51,598 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2037084679] [2023-11-06 20:59:51,598 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 20:59:51,598 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-06 20:59:51,674 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat