./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/array-crafted/zero_sum_m5.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_ded384eb-4f5d-4a05-b0cf-f3a8a449d2af/bin/utaipan-verify-FOvIYxoinp/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ded384eb-4f5d-4a05-b0cf-f3a8a449d2af/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_ded384eb-4f5d-4a05-b0cf-f3a8a449d2af/bin/utaipan-verify-FOvIYxoinp/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ded384eb-4f5d-4a05-b0cf-f3a8a449d2af/bin/utaipan-verify-FOvIYxoinp/config/TaipanReach.xml -i ../../sv-benchmarks/c/array-crafted/zero_sum_m5.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ded384eb-4f5d-4a05-b0cf-f3a8a449d2af/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_ded384eb-4f5d-4a05-b0cf-f3a8a449d2af/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 afdb8b285c2183da613babde617c7580c3aee6b3bc694b080468400e828cda16 --- Real Ultimate output --- This is Ultimate 0.2.3-dev-e7bb482 [2023-11-06 20:56:31,532 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-11-06 20:56:31,671 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ded384eb-4f5d-4a05-b0cf-f3a8a449d2af/bin/utaipan-verify-FOvIYxoinp/config/svcomp-Reach-32bit-Taipan_Default.epf [2023-11-06 20:56:31,684 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-11-06 20:56:31,685 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-11-06 20:56:31,727 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-11-06 20:56:31,728 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-11-06 20:56:31,728 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-11-06 20:56:31,729 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-11-06 20:56:31,735 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-11-06 20:56:31,735 INFO L153 SettingsManager]: * User list type=DISABLED [2023-11-06 20:56:31,737 INFO L151 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-11-06 20:56:31,737 INFO L153 SettingsManager]: * Explicit value domain=true [2023-11-06 20:56:31,739 INFO L153 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-11-06 20:56:31,739 INFO L153 SettingsManager]: * Octagon Domain=false [2023-11-06 20:56:31,740 INFO L153 SettingsManager]: * Abstract domain=CompoundDomain [2023-11-06 20:56:31,740 INFO L153 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-11-06 20:56:31,741 INFO L153 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-11-06 20:56:31,741 INFO L153 SettingsManager]: * Interval Domain=false [2023-11-06 20:56:31,742 INFO L151 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-11-06 20:56:31,742 INFO L153 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-11-06 20:56:31,743 INFO L153 SettingsManager]: * Simplification Technique=POLY_PAC [2023-11-06 20:56:31,744 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-11-06 20:56:31,745 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-11-06 20:56:31,745 INFO L153 SettingsManager]: * sizeof long=4 [2023-11-06 20:56:31,746 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-11-06 20:56:31,746 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-11-06 20:56:31,747 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-11-06 20:56:31,747 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-11-06 20:56:31,748 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-11-06 20:56:31,749 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-11-06 20:56:31,750 INFO L153 SettingsManager]: * sizeof long double=12 [2023-11-06 20:56:31,750 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2023-11-06 20:56:31,750 INFO L153 SettingsManager]: * Use constant arrays=true [2023-11-06 20:56:31,751 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-11-06 20:56:31,751 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-11-06 20:56:31,751 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-06 20:56:31,751 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-11-06 20:56:31,752 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-11-06 20:56:31,752 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2023-11-06 20:56:31,752 INFO L153 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-11-06 20:56:31,753 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-11-06 20:56:31,753 INFO L153 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-11-06 20:56:31,753 INFO L153 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-11-06 20:56:31,754 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-11-06 20:56:31,754 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_ded384eb-4f5d-4a05-b0cf-f3a8a449d2af/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ded384eb-4f5d-4a05-b0cf-f3a8a449d2af/bin/utaipan-verify-FOvIYxoinp Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> afdb8b285c2183da613babde617c7580c3aee6b3bc694b080468400e828cda16 [2023-11-06 20:56:32,055 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-11-06 20:56:32,088 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-11-06 20:56:32,091 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-11-06 20:56:32,092 INFO L270 PluginConnector]: Initializing CDTParser... [2023-11-06 20:56:32,093 INFO L274 PluginConnector]: CDTParser initialized [2023-11-06 20:56:32,095 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ded384eb-4f5d-4a05-b0cf-f3a8a449d2af/bin/utaipan-verify-FOvIYxoinp/../../sv-benchmarks/c/array-crafted/zero_sum_m5.c [2023-11-06 20:56:35,387 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-11-06 20:56:35,585 INFO L384 CDTParser]: Found 1 translation units. [2023-11-06 20:56:35,585 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ded384eb-4f5d-4a05-b0cf-f3a8a449d2af/sv-benchmarks/c/array-crafted/zero_sum_m5.c [2023-11-06 20:56:35,600 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ded384eb-4f5d-4a05-b0cf-f3a8a449d2af/bin/utaipan-verify-FOvIYxoinp/data/2fce23713/592cc3423c51471e802d0321f18513a9/FLAG183067bb7 [2023-11-06 20:56:35,617 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ded384eb-4f5d-4a05-b0cf-f3a8a449d2af/bin/utaipan-verify-FOvIYxoinp/data/2fce23713/592cc3423c51471e802d0321f18513a9 [2023-11-06 20:56:35,620 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-11-06 20:56:35,622 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-11-06 20:56:35,624 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-11-06 20:56:35,624 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-11-06 20:56:35,630 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-11-06 20:56:35,631 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.11 08:56:35" (1/1) ... [2023-11-06 20:56:35,632 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@18aa7b03 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 08:56:35, skipping insertion in model container [2023-11-06 20:56:35,633 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.11 08:56:35" (1/1) ... [2023-11-06 20:56:35,658 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-11-06 20:56:35,865 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_ded384eb-4f5d-4a05-b0cf-f3a8a449d2af/sv-benchmarks/c/array-crafted/zero_sum_m5.c[402,415] [2023-11-06 20:56:35,916 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-06 20:56:35,931 INFO L202 MainTranslator]: Completed pre-run [2023-11-06 20:56:35,950 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_ded384eb-4f5d-4a05-b0cf-f3a8a449d2af/sv-benchmarks/c/array-crafted/zero_sum_m5.c[402,415] [2023-11-06 20:56:35,981 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-06 20:56:36,001 INFO L206 MainTranslator]: Completed translation [2023-11-06 20:56:36,002 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 08:56:36 WrapperNode [2023-11-06 20:56:36,002 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-11-06 20:56:36,004 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-11-06 20:56:36,004 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-11-06 20:56:36,004 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-11-06 20:56:36,012 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 08:56:36" (1/1) ... [2023-11-06 20:56:36,030 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 08:56:36" (1/1) ... [2023-11-06 20:56:36,068 INFO L138 Inliner]: procedures = 15, calls = 21, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 152 [2023-11-06 20:56:36,069 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-11-06 20:56:36,070 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-11-06 20:56:36,070 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-11-06 20:56:36,070 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-11-06 20:56:36,081 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 08:56:36" (1/1) ... [2023-11-06 20:56:36,082 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 08:56:36" (1/1) ... [2023-11-06 20:56:36,096 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 08:56:36" (1/1) ... [2023-11-06 20:56:36,097 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 08:56:36" (1/1) ... [2023-11-06 20:56:36,112 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 08:56:36" (1/1) ... [2023-11-06 20:56:36,117 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 08:56:36" (1/1) ... [2023-11-06 20:56:36,121 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 08:56:36" (1/1) ... [2023-11-06 20:56:36,131 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 08:56:36" (1/1) ... [2023-11-06 20:56:36,133 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-11-06 20:56:36,134 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-11-06 20:56:36,138 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-11-06 20:56:36,138 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-11-06 20:56:36,139 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 08:56:36" (1/1) ... [2023-11-06 20:56:36,146 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-06 20:56:36,160 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ded384eb-4f5d-4a05-b0cf-f3a8a449d2af/bin/utaipan-verify-FOvIYxoinp/z3 [2023-11-06 20:56:36,178 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ded384eb-4f5d-4a05-b0cf-f3a8a449d2af/bin/utaipan-verify-FOvIYxoinp/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-11-06 20:56:36,207 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ded384eb-4f5d-4a05-b0cf-f3a8a449d2af/bin/utaipan-verify-FOvIYxoinp/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-11-06 20:56:36,229 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-11-06 20:56:36,229 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-11-06 20:56:36,230 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2023-11-06 20:56:36,230 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2023-11-06 20:56:36,230 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-11-06 20:56:36,230 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-11-06 20:56:36,232 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2023-11-06 20:56:36,233 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-11-06 20:56:36,320 INFO L236 CfgBuilder]: Building ICFG [2023-11-06 20:56:36,322 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2023-11-06 20:56:36,654 INFO L277 CfgBuilder]: Performing block encoding [2023-11-06 20:56:36,751 INFO L297 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-11-06 20:56:36,752 INFO L302 CfgBuilder]: Removed 11 assume(true) statements. [2023-11-06 20:56:36,755 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.11 08:56:36 BoogieIcfgContainer [2023-11-06 20:56:36,755 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-11-06 20:56:36,759 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-11-06 20:56:36,759 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-11-06 20:56:36,763 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-11-06 20:56:36,764 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 06.11 08:56:35" (1/3) ... [2023-11-06 20:56:36,765 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5cac68 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.11 08:56:36, skipping insertion in model container [2023-11-06 20:56:36,766 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 08:56:36" (2/3) ... [2023-11-06 20:56:36,768 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5cac68 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.11 08:56:36, skipping insertion in model container [2023-11-06 20:56:36,768 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.11 08:56:36" (3/3) ... [2023-11-06 20:56:36,770 INFO L112 eAbstractionObserver]: Analyzing ICFG zero_sum_m5.c [2023-11-06 20:56:36,792 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-11-06 20:56:36,793 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-11-06 20:56:36,859 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-11-06 20:56:36,868 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;@4d930bfd, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-11-06 20:56:36,869 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-11-06 20:56:36,875 INFO L276 IsEmpty]: Start isEmpty. Operand has 19 states, 17 states have (on average 1.8235294117647058) internal successors, (31), 18 states have internal predecessors, (31), 0 states have call successors, (0), 0 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 20:56:36,882 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2023-11-06 20:56:36,882 INFO L187 NwaCegarLoop]: Found error trace [2023-11-06 20:56:36,883 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-06 20:56:36,884 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-06 20:56:36,891 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-11-06 20:56:36,891 INFO L85 PathProgramCache]: Analyzing trace with hash -771036428, now seen corresponding path program 1 times [2023-11-06 20:56:36,902 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-06 20:56:36,902 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1436228906] [2023-11-06 20:56:36,903 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 20:56:36,903 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-06 20:56:37,049 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 20:56:37,244 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 20:56:37,245 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-06 20:56:37,245 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1436228906] [2023-11-06 20:56:37,246 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1436228906] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-06 20:56:37,247 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-06 20:56:37,247 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-11-06 20:56:37,249 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1291095241] [2023-11-06 20:56:37,250 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-06 20:56:37,255 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-06 20:56:37,255 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-06 20:56:37,293 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-06 20:56:37,294 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-06 20:56:37,296 INFO L87 Difference]: Start difference. First operand has 19 states, 17 states have (on average 1.8235294117647058) internal successors, (31), 18 states have internal predecessors, (31), 0 states have call successors, (0), 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 5.0) internal successors, (15), 3 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 20:56:37,385 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-06 20:56:37,385 INFO L93 Difference]: Finished difference Result 36 states and 59 transitions. [2023-11-06 20:56:37,386 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-06 20:56:37,388 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 5.0) internal successors, (15), 3 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 15 [2023-11-06 20:56:37,388 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-06 20:56:37,396 INFO L225 Difference]: With dead ends: 36 [2023-11-06 20:56:37,397 INFO L226 Difference]: Without dead ends: 17 [2023-11-06 20:56:37,400 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 20:56:37,403 INFO L413 NwaCegarLoop]: 6 mSDtfsCounter, 0 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 49 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 10 SdHoareTripleChecker+Invalid, 49 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 49 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-06 20:56:37,405 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 10 Invalid, 49 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 49 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-06 20:56:37,423 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2023-11-06 20:56:37,436 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2023-11-06 20:56:37,437 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 17 states, 16 states have (on average 1.6875) internal successors, (27), 16 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 20:56:37,438 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 27 transitions. [2023-11-06 20:56:37,440 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 27 transitions. Word has length 15 [2023-11-06 20:56:37,440 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-06 20:56:37,441 INFO L495 AbstractCegarLoop]: Abstraction has 17 states and 27 transitions. [2023-11-06 20:56:37,441 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 5.0) internal successors, (15), 3 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 20:56:37,441 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 27 transitions. [2023-11-06 20:56:37,442 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2023-11-06 20:56:37,442 INFO L187 NwaCegarLoop]: Found error trace [2023-11-06 20:56:37,442 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-06 20:56:37,442 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-11-06 20:56:37,442 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-06 20:56:37,443 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-11-06 20:56:37,443 INFO L85 PathProgramCache]: Analyzing trace with hash -457243552, now seen corresponding path program 1 times [2023-11-06 20:56:37,443 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-06 20:56:37,444 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1265623060] [2023-11-06 20:56:37,444 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 20:56:37,444 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-06 20:56:37,463 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 20:56:37,619 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 20:56:37,619 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-06 20:56:37,620 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1265623060] [2023-11-06 20:56:37,620 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1265623060] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-06 20:56:37,620 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-06 20:56:37,621 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-11-06 20:56:37,621 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1114764888] [2023-11-06 20:56:37,622 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-06 20:56:37,623 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-11-06 20:56:37,624 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-06 20:56:37,626 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-11-06 20:56:37,626 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2023-11-06 20:56:37,626 INFO L87 Difference]: Start difference. First operand 17 states and 27 transitions. Second operand has 4 states, 4 states have (on average 4.0) internal successors, (16), 4 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 20:56:37,716 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-06 20:56:37,716 INFO L93 Difference]: Finished difference Result 39 states and 67 transitions. [2023-11-06 20:56:37,717 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-11-06 20:56:37,717 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 4.0) internal successors, (16), 4 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) Word has length 16 [2023-11-06 20:56:37,717 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-06 20:56:37,718 INFO L225 Difference]: With dead ends: 39 [2023-11-06 20:56:37,718 INFO L226 Difference]: Without dead ends: 27 [2023-11-06 20:56:37,719 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 20:56:37,721 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 32 mSDsluCounter, 2 mSDsCounter, 0 mSdLazyCounter, 37 mSolverCounterSat, 18 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 32 SdHoareTripleChecker+Valid, 5 SdHoareTripleChecker+Invalid, 55 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 18 IncrementalHoareTripleChecker+Valid, 37 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-06 20:56:37,721 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [32 Valid, 5 Invalid, 55 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [18 Valid, 37 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-06 20:56:37,722 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2023-11-06 20:56:37,730 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2023-11-06 20:56:37,734 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27 states, 26 states have (on average 1.4230769230769231) internal successors, (37), 26 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 20:56:37,735 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 37 transitions. [2023-11-06 20:56:37,736 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 37 transitions. Word has length 16 [2023-11-06 20:56:37,737 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-06 20:56:37,737 INFO L495 AbstractCegarLoop]: Abstraction has 27 states and 37 transitions. [2023-11-06 20:56:37,739 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 4.0) internal successors, (16), 4 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 20:56:37,739 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 37 transitions. [2023-11-06 20:56:37,740 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2023-11-06 20:56:37,740 INFO L187 NwaCegarLoop]: Found error trace [2023-11-06 20:56:37,741 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-06 20:56:37,742 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2023-11-06 20:56:37,742 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-06 20:56:37,748 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-11-06 20:56:37,748 INFO L85 PathProgramCache]: Analyzing trace with hash -1136289564, now seen corresponding path program 1 times [2023-11-06 20:56:37,754 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-06 20:56:37,754 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1312782530] [2023-11-06 20:56:37,754 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 20:56:37,755 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-06 20:56:37,829 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 20:56:38,011 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2023-11-06 20:56:38,011 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-06 20:56:38,012 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1312782530] [2023-11-06 20:56:38,012 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1312782530] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-06 20:56:38,012 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1300137151] [2023-11-06 20:56:38,012 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 20:56:38,013 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-06 20:56:38,013 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ded384eb-4f5d-4a05-b0cf-f3a8a449d2af/bin/utaipan-verify-FOvIYxoinp/z3 [2023-11-06 20:56:38,018 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ded384eb-4f5d-4a05-b0cf-f3a8a449d2af/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-06 20:56:38,025 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ded384eb-4f5d-4a05-b0cf-f3a8a449d2af/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-11-06 20:56:38,138 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 20:56:38,140 INFO L262 TraceCheckSpWp]: Trace formula consists of 137 conjuncts, 4 conjunts are in the unsatisfiable core [2023-11-06 20:56:38,146 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-06 20:56:38,237 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2023-11-06 20:56:38,237 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-06 20:56:38,297 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2023-11-06 20:56:38,297 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1300137151] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-06 20:56:38,298 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [241574617] [2023-11-06 20:56:38,328 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2023-11-06 20:56:38,329 INFO L166 IcfgInterpreter]: Building call graph [2023-11-06 20:56:38,333 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-06 20:56:38,340 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-06 20:56:38,341 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-06 20:56:39,331 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-06 20:56:39,478 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '394#(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 20:56:39,478 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-06 20:56:39,478 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-06 20:56:39,485 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 7 [2023-11-06 20:56:39,485 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2059726279] [2023-11-06 20:56:39,486 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-06 20:56:39,488 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-11-06 20:56:39,488 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-06 20:56:39,490 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-11-06 20:56:39,492 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=99, Unknown=0, NotChecked=0, Total=132 [2023-11-06 20:56:39,492 INFO L87 Difference]: Start difference. First operand 27 states and 37 transitions. Second operand has 7 states, 7 states have (on average 4.428571428571429) internal successors, (31), 7 states have internal predecessors, (31), 0 states have call successors, (0), 0 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 20:56:39,560 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-06 20:56:39,561 INFO L93 Difference]: Finished difference Result 51 states and 71 transitions. [2023-11-06 20:56:39,561 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-11-06 20:56:39,561 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 4.428571428571429) internal successors, (31), 7 states have internal predecessors, (31), 0 states have call successors, (0), 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 26 [2023-11-06 20:56:39,562 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-06 20:56:39,564 INFO L225 Difference]: With dead ends: 51 [2023-11-06 20:56:39,564 INFO L226 Difference]: Without dead ends: 28 [2023-11-06 20:56:39,565 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 80 GetRequests, 69 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 20:56:39,569 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 0 mSDsluCounter, 2 mSDsCounter, 0 mSdLazyCounter, 48 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 5 SdHoareTripleChecker+Invalid, 48 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 48 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-06 20:56:39,571 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 5 Invalid, 48 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 48 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-06 20:56:39,574 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2023-11-06 20:56:39,582 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2023-11-06 20:56:39,583 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28 states, 27 states have (on average 1.4074074074074074) internal successors, (38), 27 states have internal predecessors, (38), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 20:56:39,585 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 38 transitions. [2023-11-06 20:56:39,586 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 38 transitions. Word has length 26 [2023-11-06 20:56:39,586 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-06 20:56:39,586 INFO L495 AbstractCegarLoop]: Abstraction has 28 states and 38 transitions. [2023-11-06 20:56:39,586 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 4.428571428571429) internal successors, (31), 7 states have internal predecessors, (31), 0 states have call successors, (0), 0 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 20:56:39,587 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 38 transitions. [2023-11-06 20:56:39,587 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2023-11-06 20:56:39,587 INFO L187 NwaCegarLoop]: Found error trace [2023-11-06 20:56:39,588 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-06 20:56:39,601 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ded384eb-4f5d-4a05-b0cf-f3a8a449d2af/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Ended with exit code 0 [2023-11-06 20:56:39,795 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ded384eb-4f5d-4a05-b0cf-f3a8a449d2af/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-06 20:56:39,795 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-06 20:56:39,796 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-11-06 20:56:39,796 INFO L85 PathProgramCache]: Analyzing trace with hash 1227465720, now seen corresponding path program 2 times [2023-11-06 20:56:39,796 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-06 20:56:39,796 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [295197729] [2023-11-06 20:56:39,797 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 20:56:39,797 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-06 20:56:39,826 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 20:56:39,914 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2023-11-06 20:56:39,915 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-06 20:56:39,915 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [295197729] [2023-11-06 20:56:39,915 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [295197729] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-06 20:56:39,915 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1933680591] [2023-11-06 20:56:39,916 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-11-06 20:56:39,916 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-06 20:56:39,916 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ded384eb-4f5d-4a05-b0cf-f3a8a449d2af/bin/utaipan-verify-FOvIYxoinp/z3 [2023-11-06 20:56:39,917 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ded384eb-4f5d-4a05-b0cf-f3a8a449d2af/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-06 20:56:39,940 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ded384eb-4f5d-4a05-b0cf-f3a8a449d2af/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-11-06 20:56:40,023 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2023-11-06 20:56:40,024 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-06 20:56:40,025 INFO L262 TraceCheckSpWp]: Trace formula consists of 146 conjuncts, 4 conjunts are in the unsatisfiable core [2023-11-06 20:56:40,027 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-06 20:56:40,076 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2023-11-06 20:56:40,077 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-06 20:56:40,118 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2023-11-06 20:56:40,118 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1933680591] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-06 20:56:40,118 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1056020105] [2023-11-06 20:56:40,122 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2023-11-06 20:56:40,122 INFO L166 IcfgInterpreter]: Building call graph [2023-11-06 20:56:40,122 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-06 20:56:40,123 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-06 20:56:40,123 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-06 20:56:40,612 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-06 20:56:40,768 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '708#(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 20:56:40,768 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-06 20:56:40,768 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-06 20:56:40,768 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 8 [2023-11-06 20:56:40,769 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [628180823] [2023-11-06 20:56:40,769 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-06 20:56:40,769 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2023-11-06 20:56:40,769 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-06 20:56:40,772 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2023-11-06 20:56:40,772 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=117, Unknown=0, NotChecked=0, Total=156 [2023-11-06 20:56:40,772 INFO L87 Difference]: Start difference. First operand 28 states and 38 transitions. Second operand has 8 states, 8 states have (on average 5.5) internal successors, (44), 8 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 20:56:40,917 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-06 20:56:40,917 INFO L93 Difference]: Finished difference Result 59 states and 87 transitions. [2023-11-06 20:56:40,918 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-11-06 20:56:40,918 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 5.5) internal successors, (44), 8 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 27 [2023-11-06 20:56:40,918 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-06 20:56:40,919 INFO L225 Difference]: With dead ends: 59 [2023-11-06 20:56:40,919 INFO L226 Difference]: Without dead ends: 38 [2023-11-06 20:56:40,919 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 84 GetRequests, 70 SyntacticMatches, 3 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 54 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=39, Invalid=117, Unknown=0, NotChecked=0, Total=156 [2023-11-06 20:56:40,920 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 17 mSDsluCounter, 6 mSDsCounter, 0 mSdLazyCounter, 65 mSolverCounterSat, 42 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 17 SdHoareTripleChecker+Valid, 9 SdHoareTripleChecker+Invalid, 107 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 42 IncrementalHoareTripleChecker+Valid, 65 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-06 20:56:40,921 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [17 Valid, 9 Invalid, 107 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [42 Valid, 65 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-06 20:56:40,922 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2023-11-06 20:56:40,927 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 38. [2023-11-06 20:56:40,927 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 38 states, 37 states have (on average 1.2972972972972974) internal successors, (48), 37 states have internal predecessors, (48), 0 states have call successors, (0), 0 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 20:56:40,928 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 48 transitions. [2023-11-06 20:56:40,928 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 48 transitions. Word has length 27 [2023-11-06 20:56:40,928 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-06 20:56:40,928 INFO L495 AbstractCegarLoop]: Abstraction has 38 states and 48 transitions. [2023-11-06 20:56:40,929 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 5.5) internal successors, (44), 8 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 20:56:40,929 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 48 transitions. [2023-11-06 20:56:40,930 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2023-11-06 20:56:40,930 INFO L187 NwaCegarLoop]: Found error trace [2023-11-06 20:56:40,930 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-06 20:56:40,953 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ded384eb-4f5d-4a05-b0cf-f3a8a449d2af/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2023-11-06 20:56:41,146 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ded384eb-4f5d-4a05-b0cf-f3a8a449d2af/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-06 20:56:41,146 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-06 20:56:41,147 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-11-06 20:56:41,147 INFO L85 PathProgramCache]: Analyzing trace with hash 1791503604, now seen corresponding path program 3 times [2023-11-06 20:56:41,147 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-06 20:56:41,147 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [846594154] [2023-11-06 20:56:41,148 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 20:56:41,148 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-06 20:56:41,422 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 20:56:46,117 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 0 proven. 33 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-06 20:56:46,118 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-06 20:56:46,118 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [846594154] [2023-11-06 20:56:46,118 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [846594154] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-06 20:56:46,118 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [907132410] [2023-11-06 20:56:46,119 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-11-06 20:56:46,119 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-06 20:56:46,119 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ded384eb-4f5d-4a05-b0cf-f3a8a449d2af/bin/utaipan-verify-FOvIYxoinp/z3 [2023-11-06 20:56:46,120 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ded384eb-4f5d-4a05-b0cf-f3a8a449d2af/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-06 20:56:46,148 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ded384eb-4f5d-4a05-b0cf-f3a8a449d2af/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-11-06 20:56:46,232 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-11-06 20:56:46,235 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-06 20:56:46,239 INFO L262 TraceCheckSpWp]: Trace formula consists of 196 conjuncts, 96 conjunts are in the unsatisfiable core [2023-11-06 20:56:46,246 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-06 20:56:46,303 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 20:56:46,612 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 0 proven. 33 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-06 20:56:46,612 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-06 20:56:48,404 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2023-11-06 20:56:48,405 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [907132410] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-06 20:56:48,405 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1610332333] [2023-11-06 20:56:48,408 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2023-11-06 20:56:48,408 INFO L166 IcfgInterpreter]: Building call graph [2023-11-06 20:56:48,408 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-06 20:56:48,409 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-06 20:56:48,409 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-06 20:56:48,855 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-06 20:56:49,317 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1164#(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 20:56:49,317 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-06 20:56:49,317 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-06 20:56:49,317 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 28, 29] total 54 [2023-11-06 20:56:49,318 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [443345263] [2023-11-06 20:56:49,318 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-06 20:56:49,319 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 54 states [2023-11-06 20:56:49,319 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-06 20:56:49,320 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 54 interpolants. [2023-11-06 20:56:49,321 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=179, Invalid=3243, Unknown=0, NotChecked=0, Total=3422 [2023-11-06 20:56:49,322 INFO L87 Difference]: Start difference. First operand 38 states and 48 transitions. Second operand has 54 states, 54 states have (on average 1.3148148148148149) internal successors, (71), 54 states have internal predecessors, (71), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 20:56:50,703 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-06 20:56:50,703 INFO L93 Difference]: Finished difference Result 69 states and 88 transitions. [2023-11-06 20:56:50,704 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2023-11-06 20:56:50,704 INFO L78 Accepts]: Start accepts. Automaton has has 54 states, 54 states have (on average 1.3148148148148149) internal successors, (71), 54 states have internal predecessors, (71), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 37 [2023-11-06 20:56:50,704 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-06 20:56:50,705 INFO L225 Difference]: With dead ends: 69 [2023-11-06 20:56:50,705 INFO L226 Difference]: Without dead ends: 66 [2023-11-06 20:56:50,707 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 146 GetRequests, 88 SyntacticMatches, 0 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 799 ImplicationChecksByTransitivity, 2.8s TimeCoverageRelationStatistics Valid=185, Invalid=3355, Unknown=0, NotChecked=0, Total=3540 [2023-11-06 20:56:50,708 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 2 mSDsluCounter, 74 mSDsCounter, 0 mSdLazyCounter, 1692 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 77 SdHoareTripleChecker+Invalid, 1693 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 1692 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.3s IncrementalHoareTripleChecker+Time [2023-11-06 20:56:50,709 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [2 Valid, 77 Invalid, 1693 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 1692 Invalid, 0 Unknown, 0 Unchecked, 1.3s Time] [2023-11-06 20:56:50,709 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2023-11-06 20:56:50,722 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 64. [2023-11-06 20:56:50,723 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 64 states, 63 states have (on average 1.3174603174603174) internal successors, (83), 63 states have internal predecessors, (83), 0 states have call successors, (0), 0 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 20:56:50,724 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 83 transitions. [2023-11-06 20:56:50,724 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 83 transitions. Word has length 37 [2023-11-06 20:56:50,725 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-06 20:56:50,725 INFO L495 AbstractCegarLoop]: Abstraction has 64 states and 83 transitions. [2023-11-06 20:56:50,725 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 54 states, 54 states have (on average 1.3148148148148149) internal successors, (71), 54 states have internal predecessors, (71), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 20:56:50,726 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 83 transitions. [2023-11-06 20:56:50,727 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2023-11-06 20:56:50,727 INFO L187 NwaCegarLoop]: Found error trace [2023-11-06 20:56:50,727 INFO L195 NwaCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-06 20:56:50,740 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ded384eb-4f5d-4a05-b0cf-f3a8a449d2af/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2023-11-06 20:56:50,933 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ded384eb-4f5d-4a05-b0cf-f3a8a449d2af/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-06 20:56:50,934 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-06 20:56:50,934 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-11-06 20:56:50,934 INFO L85 PathProgramCache]: Analyzing trace with hash 101877557, now seen corresponding path program 4 times [2023-11-06 20:56:50,934 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-06 20:56:50,934 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [198900736] [2023-11-06 20:56:50,935 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 20:56:50,935 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-06 20:56:50,959 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 20:56:51,088 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 4 proven. 5 refuted. 0 times theorem prover too weak. 27 trivial. 0 not checked. [2023-11-06 20:56:51,088 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-06 20:56:51,089 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [198900736] [2023-11-06 20:56:51,089 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [198900736] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-06 20:56:51,089 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1953499368] [2023-11-06 20:56:51,089 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-11-06 20:56:51,089 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-06 20:56:51,090 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ded384eb-4f5d-4a05-b0cf-f3a8a449d2af/bin/utaipan-verify-FOvIYxoinp/z3 [2023-11-06 20:56:51,091 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ded384eb-4f5d-4a05-b0cf-f3a8a449d2af/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-06 20:56:51,117 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ded384eb-4f5d-4a05-b0cf-f3a8a449d2af/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-11-06 20:56:51,185 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 20:56:51,187 INFO L262 TraceCheckSpWp]: Trace formula consists of 201 conjuncts, 8 conjunts are in the unsatisfiable core [2023-11-06 20:56:51,191 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-06 20:56:51,254 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 27 trivial. 0 not checked. [2023-11-06 20:56:51,254 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-06 20:56:51,309 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 27 trivial. 0 not checked. [2023-11-06 20:56:51,310 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1953499368] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-06 20:56:51,310 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1628604406] [2023-11-06 20:56:51,315 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2023-11-06 20:56:51,315 INFO L166 IcfgInterpreter]: Building call graph [2023-11-06 20:56:51,316 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-06 20:56:51,317 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-06 20:56:51,317 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-06 20:56:51,664 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-06 20:56:51,820 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1660#(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 20:56:51,820 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-06 20:56:51,820 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-06 20:56:51,820 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 14 [2023-11-06 20:56:51,820 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [137881054] [2023-11-06 20:56:51,821 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-06 20:56:51,821 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2023-11-06 20:56:51,821 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-06 20:56:51,822 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2023-11-06 20:56:51,822 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=72, Invalid=270, Unknown=0, NotChecked=0, Total=342 [2023-11-06 20:56:51,822 INFO L87 Difference]: Start difference. First operand 64 states and 83 transitions. Second operand has 14 states, 14 states have (on average 2.642857142857143) internal successors, (37), 14 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 20:56:52,108 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-06 20:56:52,108 INFO L93 Difference]: Finished difference Result 126 states and 164 transitions. [2023-11-06 20:56:52,108 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2023-11-06 20:56:52,109 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 2.642857142857143) internal successors, (37), 14 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 38 [2023-11-06 20:56:52,109 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-06 20:56:52,110 INFO L225 Difference]: With dead ends: 126 [2023-11-06 20:56:52,110 INFO L226 Difference]: Without dead ends: 65 [2023-11-06 20:56:52,112 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 121 GetRequests, 99 SyntacticMatches, 5 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 134 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=72, Invalid=270, Unknown=0, NotChecked=0, Total=342 [2023-11-06 20:56:52,113 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 2 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 302 mSolverCounterSat, 91 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 15 SdHoareTripleChecker+Invalid, 393 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 91 IncrementalHoareTripleChecker+Valid, 302 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-06 20:56:52,113 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [2 Valid, 15 Invalid, 393 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [91 Valid, 302 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-11-06 20:56:52,114 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2023-11-06 20:56:52,130 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 65. [2023-11-06 20:56:52,130 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 65 states, 64 states have (on average 1.3125) internal successors, (84), 64 states have internal predecessors, (84), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 20:56:52,131 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 84 transitions. [2023-11-06 20:56:52,132 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 84 transitions. Word has length 38 [2023-11-06 20:56:52,132 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-06 20:56:52,132 INFO L495 AbstractCegarLoop]: Abstraction has 65 states and 84 transitions. [2023-11-06 20:56:52,133 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 2.642857142857143) internal successors, (37), 14 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 20:56:52,133 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 84 transitions. [2023-11-06 20:56:52,137 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2023-11-06 20:56:52,137 INFO L187 NwaCegarLoop]: Found error trace [2023-11-06 20:56:52,137 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-06 20:56:52,156 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ded384eb-4f5d-4a05-b0cf-f3a8a449d2af/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2023-11-06 20:56:52,349 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ded384eb-4f5d-4a05-b0cf-f3a8a449d2af/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2023-11-06 20:56:52,349 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-06 20:56:52,350 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-11-06 20:56:52,350 INFO L85 PathProgramCache]: Analyzing trace with hash -1602579383, now seen corresponding path program 5 times [2023-11-06 20:56:52,350 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-06 20:56:52,350 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1630247532] [2023-11-06 20:56:52,350 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 20:56:52,351 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-06 20:56:52,371 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 20:56:52,491 INFO L134 CoverageAnalysis]: Checked inductivity of 39 backedges. 1 proven. 8 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2023-11-06 20:56:52,491 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-06 20:56:52,491 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1630247532] [2023-11-06 20:56:52,492 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1630247532] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-06 20:56:52,492 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [349645983] [2023-11-06 20:56:52,492 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-11-06 20:56:52,492 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-06 20:56:52,493 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ded384eb-4f5d-4a05-b0cf-f3a8a449d2af/bin/utaipan-verify-FOvIYxoinp/z3 [2023-11-06 20:56:52,494 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ded384eb-4f5d-4a05-b0cf-f3a8a449d2af/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-06 20:56:52,524 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ded384eb-4f5d-4a05-b0cf-f3a8a449d2af/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-11-06 20:56:52,598 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2023-11-06 20:56:52,598 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-06 20:56:52,600 INFO L262 TraceCheckSpWp]: Trace formula consists of 210 conjuncts, 8 conjunts are in the unsatisfiable core [2023-11-06 20:56:52,602 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-06 20:56:52,710 INFO L134 CoverageAnalysis]: Checked inductivity of 39 backedges. 3 proven. 6 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2023-11-06 20:56:52,711 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-06 20:56:52,815 INFO L134 CoverageAnalysis]: Checked inductivity of 39 backedges. 3 proven. 6 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2023-11-06 20:56:52,816 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [349645983] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-06 20:56:52,816 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1341472550] [2023-11-06 20:56:52,820 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2023-11-06 20:56:52,821 INFO L166 IcfgInterpreter]: Building call graph [2023-11-06 20:56:52,822 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-06 20:56:52,822 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-06 20:56:52,822 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-06 20:56:53,135 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-06 20:56:53,282 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2276#(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 20:56:53,282 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-06 20:56:53,282 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-06 20:56:53,282 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 14 [2023-11-06 20:56:53,283 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1993528673] [2023-11-06 20:56:53,283 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-06 20:56:53,283 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2023-11-06 20:56:53,283 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-06 20:56:53,284 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2023-11-06 20:56:53,284 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=66, Invalid=276, Unknown=0, NotChecked=0, Total=342 [2023-11-06 20:56:53,285 INFO L87 Difference]: Start difference. First operand 65 states and 84 transitions. Second operand has 14 states, 14 states have (on average 4.071428571428571) internal successors, (57), 14 states have internal predecessors, (57), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 20:56:53,466 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-06 20:56:53,467 INFO L93 Difference]: Finished difference Result 102 states and 138 transitions. [2023-11-06 20:56:53,467 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2023-11-06 20:56:53,467 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 4.071428571428571) internal successors, (57), 14 states have internal predecessors, (57), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 39 [2023-11-06 20:56:53,468 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-06 20:56:53,468 INFO L225 Difference]: With dead ends: 102 [2023-11-06 20:56:53,468 INFO L226 Difference]: Without dead ends: 49 [2023-11-06 20:56:53,469 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 125 GetRequests, 101 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 20:56:53,470 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 5 mSDsluCounter, 18 mSDsCounter, 0 mSdLazyCounter, 206 mSolverCounterSat, 51 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 21 SdHoareTripleChecker+Invalid, 257 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 51 IncrementalHoareTripleChecker+Valid, 206 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-06 20:56:53,470 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [5 Valid, 21 Invalid, 257 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [51 Valid, 206 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-11-06 20:56:53,471 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2023-11-06 20:56:53,490 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 49. [2023-11-06 20:56:53,491 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 49 states, 48 states have (on average 1.2291666666666667) internal successors, (59), 48 states have internal predecessors, (59), 0 states have call successors, (0), 0 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 20:56:53,491 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 59 transitions. [2023-11-06 20:56:53,491 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 59 transitions. Word has length 39 [2023-11-06 20:56:53,491 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-06 20:56:53,492 INFO L495 AbstractCegarLoop]: Abstraction has 49 states and 59 transitions. [2023-11-06 20:56:53,492 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 4.071428571428571) internal successors, (57), 14 states have internal predecessors, (57), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 20:56:53,492 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 59 transitions. [2023-11-06 20:56:53,493 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2023-11-06 20:56:53,493 INFO L187 NwaCegarLoop]: Found error trace [2023-11-06 20:56:53,493 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-06 20:56:53,504 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ded384eb-4f5d-4a05-b0cf-f3a8a449d2af/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2023-11-06 20:56:53,693 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ded384eb-4f5d-4a05-b0cf-f3a8a449d2af/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-06 20:56:53,694 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-06 20:56:53,694 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-11-06 20:56:53,694 INFO L85 PathProgramCache]: Analyzing trace with hash 1751171940, now seen corresponding path program 6 times [2023-11-06 20:56:53,694 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-06 20:56:53,695 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1980805591] [2023-11-06 20:56:53,695 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 20:56:53,695 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-06 20:56:53,982 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 20:57:00,625 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-06 20:57:00,626 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-06 20:57:00,626 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1980805591] [2023-11-06 20:57:00,626 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1980805591] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-06 20:57:00,626 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2097030419] [2023-11-06 20:57:00,626 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-11-06 20:57:00,627 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-06 20:57:00,627 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ded384eb-4f5d-4a05-b0cf-f3a8a449d2af/bin/utaipan-verify-FOvIYxoinp/z3 [2023-11-06 20:57:00,629 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ded384eb-4f5d-4a05-b0cf-f3a8a449d2af/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-06 20:57:00,656 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ded384eb-4f5d-4a05-b0cf-f3a8a449d2af/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process