./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/array-crafted/zero_sum_m4.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version e7bb482b Calling Ultimate with: /usr/lib/jvm/java-11-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ec3dce6-5908-4ed7-8ba3-e32816b87ff4/bin/utaipan-verify-FOvIYxoinp/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ec3dce6-5908-4ed7-8ba3-e32816b87ff4/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_3ec3dce6-5908-4ed7-8ba3-e32816b87ff4/bin/utaipan-verify-FOvIYxoinp/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ec3dce6-5908-4ed7-8ba3-e32816b87ff4/bin/utaipan-verify-FOvIYxoinp/config/TaipanReach.xml -i ../../sv-benchmarks/c/array-crafted/zero_sum_m4.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ec3dce6-5908-4ed7-8ba3-e32816b87ff4/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_3ec3dce6-5908-4ed7-8ba3-e32816b87ff4/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 9b7320b0b08ab747958954e3beeb769f7a9cf6ae7994b9d20ef1bd1e033aa0a7 --- Real Ultimate output --- This is Ultimate 0.2.3-dev-e7bb482 [2023-11-06 21:07:57,693 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-11-06 21:07:57,810 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ec3dce6-5908-4ed7-8ba3-e32816b87ff4/bin/utaipan-verify-FOvIYxoinp/config/svcomp-Reach-32bit-Taipan_Default.epf [2023-11-06 21:07:57,819 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-11-06 21:07:57,820 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-11-06 21:07:57,869 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-11-06 21:07:57,870 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-11-06 21:07:57,871 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-11-06 21:07:57,872 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-11-06 21:07:57,877 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-11-06 21:07:57,878 INFO L153 SettingsManager]: * User list type=DISABLED [2023-11-06 21:07:57,879 INFO L151 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-11-06 21:07:57,880 INFO L153 SettingsManager]: * Explicit value domain=true [2023-11-06 21:07:57,881 INFO L153 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-11-06 21:07:57,882 INFO L153 SettingsManager]: * Octagon Domain=false [2023-11-06 21:07:57,883 INFO L153 SettingsManager]: * Abstract domain=CompoundDomain [2023-11-06 21:07:57,883 INFO L153 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-11-06 21:07:57,884 INFO L153 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-11-06 21:07:57,884 INFO L153 SettingsManager]: * Interval Domain=false [2023-11-06 21:07:57,885 INFO L151 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-11-06 21:07:57,885 INFO L153 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-11-06 21:07:57,886 INFO L153 SettingsManager]: * Simplification Technique=POLY_PAC [2023-11-06 21:07:57,887 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-11-06 21:07:57,888 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-11-06 21:07:57,888 INFO L153 SettingsManager]: * sizeof long=4 [2023-11-06 21:07:57,889 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-11-06 21:07:57,889 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-11-06 21:07:57,890 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-11-06 21:07:57,890 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-11-06 21:07:57,891 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-11-06 21:07:57,892 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-11-06 21:07:57,893 INFO L153 SettingsManager]: * sizeof long double=12 [2023-11-06 21:07:57,893 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2023-11-06 21:07:57,893 INFO L153 SettingsManager]: * Use constant arrays=true [2023-11-06 21:07:57,894 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-11-06 21:07:57,894 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-11-06 21:07:57,894 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-06 21:07:57,895 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-11-06 21:07:57,895 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-11-06 21:07:57,896 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2023-11-06 21:07:57,896 INFO L153 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-11-06 21:07:57,897 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-11-06 21:07:57,897 INFO L153 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-11-06 21:07:57,897 INFO L153 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-11-06 21:07:57,898 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-11-06 21:07:57,898 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_3ec3dce6-5908-4ed7-8ba3-e32816b87ff4/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ec3dce6-5908-4ed7-8ba3-e32816b87ff4/bin/utaipan-verify-FOvIYxoinp Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 9b7320b0b08ab747958954e3beeb769f7a9cf6ae7994b9d20ef1bd1e033aa0a7 [2023-11-06 21:07:58,190 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-11-06 21:07:58,243 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-11-06 21:07:58,246 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-11-06 21:07:58,247 INFO L270 PluginConnector]: Initializing CDTParser... [2023-11-06 21:07:58,251 INFO L274 PluginConnector]: CDTParser initialized [2023-11-06 21:07:58,254 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ec3dce6-5908-4ed7-8ba3-e32816b87ff4/bin/utaipan-verify-FOvIYxoinp/../../sv-benchmarks/c/array-crafted/zero_sum_m4.c [2023-11-06 21:08:01,522 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-11-06 21:08:01,786 INFO L384 CDTParser]: Found 1 translation units. [2023-11-06 21:08:01,787 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ec3dce6-5908-4ed7-8ba3-e32816b87ff4/sv-benchmarks/c/array-crafted/zero_sum_m4.c [2023-11-06 21:08:01,795 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ec3dce6-5908-4ed7-8ba3-e32816b87ff4/bin/utaipan-verify-FOvIYxoinp/data/9b5a8bb8c/9685cc99d0d341358e9590c9ddafabfc/FLAG4ae7bb4e4 [2023-11-06 21:08:01,809 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ec3dce6-5908-4ed7-8ba3-e32816b87ff4/bin/utaipan-verify-FOvIYxoinp/data/9b5a8bb8c/9685cc99d0d341358e9590c9ddafabfc [2023-11-06 21:08:01,812 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-11-06 21:08:01,814 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-11-06 21:08:01,815 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-11-06 21:08:01,815 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-11-06 21:08:01,825 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-11-06 21:08:01,826 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.11 09:08:01" (1/1) ... [2023-11-06 21:08:01,827 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@43fbdc7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 09:08:01, skipping insertion in model container [2023-11-06 21:08:01,827 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.11 09:08:01" (1/1) ... [2023-11-06 21:08:01,857 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-11-06 21:08:02,031 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_3ec3dce6-5908-4ed7-8ba3-e32816b87ff4/sv-benchmarks/c/array-crafted/zero_sum_m4.c[402,415] [2023-11-06 21:08:02,054 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-06 21:08:02,063 INFO L202 MainTranslator]: Completed pre-run [2023-11-06 21:08:02,076 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_3ec3dce6-5908-4ed7-8ba3-e32816b87ff4/sv-benchmarks/c/array-crafted/zero_sum_m4.c[402,415] [2023-11-06 21:08:02,087 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-06 21:08:02,102 INFO L206 MainTranslator]: Completed translation [2023-11-06 21:08:02,102 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 09:08:02 WrapperNode [2023-11-06 21:08:02,102 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-11-06 21:08:02,103 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-11-06 21:08:02,104 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-11-06 21:08:02,104 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-11-06 21:08:02,110 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 09:08:02" (1/1) ... [2023-11-06 21:08:02,118 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 09:08:02" (1/1) ... [2023-11-06 21:08:02,138 INFO L138 Inliner]: procedures = 15, calls = 19, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 130 [2023-11-06 21:08:02,138 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-11-06 21:08:02,139 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-11-06 21:08:02,139 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-11-06 21:08:02,140 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-11-06 21:08:02,151 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 09:08:02" (1/1) ... [2023-11-06 21:08:02,151 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 09:08:02" (1/1) ... [2023-11-06 21:08:02,153 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 09:08:02" (1/1) ... [2023-11-06 21:08:02,154 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 09:08:02" (1/1) ... [2023-11-06 21:08:02,160 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 09:08:02" (1/1) ... [2023-11-06 21:08:02,164 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 09:08:02" (1/1) ... [2023-11-06 21:08:02,166 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 09:08:02" (1/1) ... [2023-11-06 21:08:02,167 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 09:08:02" (1/1) ... [2023-11-06 21:08:02,170 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-11-06 21:08:02,171 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-11-06 21:08:02,171 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-11-06 21:08:02,171 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-11-06 21:08:02,172 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 09:08:02" (1/1) ... [2023-11-06 21:08:02,179 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-06 21:08:02,195 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ec3dce6-5908-4ed7-8ba3-e32816b87ff4/bin/utaipan-verify-FOvIYxoinp/z3 [2023-11-06 21:08:02,208 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ec3dce6-5908-4ed7-8ba3-e32816b87ff4/bin/utaipan-verify-FOvIYxoinp/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-11-06 21:08:02,247 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ec3dce6-5908-4ed7-8ba3-e32816b87ff4/bin/utaipan-verify-FOvIYxoinp/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-11-06 21:08:02,267 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-11-06 21:08:02,268 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-11-06 21:08:02,268 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2023-11-06 21:08:02,268 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2023-11-06 21:08:02,268 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-11-06 21:08:02,268 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-11-06 21:08:02,271 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2023-11-06 21:08:02,272 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-11-06 21:08:02,369 INFO L236 CfgBuilder]: Building ICFG [2023-11-06 21:08:02,371 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2023-11-06 21:08:02,686 INFO L277 CfgBuilder]: Performing block encoding [2023-11-06 21:08:02,739 INFO L297 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-11-06 21:08:02,740 INFO L302 CfgBuilder]: Removed 9 assume(true) statements. [2023-11-06 21:08:02,742 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.11 09:08:02 BoogieIcfgContainer [2023-11-06 21:08:02,742 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-11-06 21:08:02,746 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-11-06 21:08:02,746 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-11-06 21:08:02,750 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-11-06 21:08:02,750 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 06.11 09:08:01" (1/3) ... [2023-11-06 21:08:02,751 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@36d16a57 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.11 09:08:02, skipping insertion in model container [2023-11-06 21:08:02,751 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 09:08:02" (2/3) ... [2023-11-06 21:08:02,752 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@36d16a57 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.11 09:08:02, skipping insertion in model container [2023-11-06 21:08:02,752 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.11 09:08:02" (3/3) ... [2023-11-06 21:08:02,753 INFO L112 eAbstractionObserver]: Analyzing ICFG zero_sum_m4.c [2023-11-06 21:08:02,773 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-11-06 21:08:02,774 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-11-06 21:08:02,825 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-11-06 21:08:02,832 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;@39546ee, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-11-06 21:08:02,833 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-11-06 21:08:02,837 INFO L276 IsEmpty]: Start isEmpty. Operand has 17 states, 15 states have (on average 1.8) 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 21:08:02,844 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2023-11-06 21:08:02,844 INFO L187 NwaCegarLoop]: Found error trace [2023-11-06 21:08:02,845 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-06 21:08:02,845 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-06 21:08:02,870 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-11-06 21:08:02,870 INFO L85 PathProgramCache]: Analyzing trace with hash -1746940592, now seen corresponding path program 1 times [2023-11-06 21:08:02,880 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-06 21:08:02,881 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [166099005] [2023-11-06 21:08:02,881 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 21:08:02,881 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-06 21:08:02,998 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 21:08:03,212 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 21:08:03,212 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-06 21:08:03,213 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [166099005] [2023-11-06 21:08:03,214 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [166099005] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-06 21:08:03,214 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-06 21:08:03,214 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-11-06 21:08:03,216 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [432186974] [2023-11-06 21:08:03,217 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-06 21:08:03,220 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-06 21:08:03,221 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-06 21:08:03,257 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-06 21:08:03,258 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-06 21:08:03,261 INFO L87 Difference]: Start difference. First operand has 17 states, 15 states have (on average 1.8) 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) Second operand has 3 states, 3 states have (on average 4.333333333333333) internal successors, (13), 3 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 21:08:03,354 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-06 21:08:03,355 INFO L93 Difference]: Finished difference Result 32 states and 51 transitions. [2023-11-06 21:08:03,356 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-06 21:08:03,357 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 4.333333333333333) internal successors, (13), 3 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 13 [2023-11-06 21:08:03,358 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-06 21:08:03,367 INFO L225 Difference]: With dead ends: 32 [2023-11-06 21:08:03,367 INFO L226 Difference]: Without dead ends: 15 [2023-11-06 21:08:03,370 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 21:08:03,373 INFO L413 NwaCegarLoop]: 6 mSDtfsCounter, 0 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 41 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 10 SdHoareTripleChecker+Invalid, 41 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 41 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-06 21:08:03,374 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 10 Invalid, 41 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 41 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-06 21:08:03,392 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2023-11-06 21:08:03,403 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2023-11-06 21:08:03,404 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 15 states, 14 states have (on average 1.6428571428571428) internal successors, (23), 14 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 21:08:03,405 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 23 transitions. [2023-11-06 21:08:03,406 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 23 transitions. Word has length 13 [2023-11-06 21:08:03,406 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-06 21:08:03,407 INFO L495 AbstractCegarLoop]: Abstraction has 15 states and 23 transitions. [2023-11-06 21:08:03,407 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 4.333333333333333) internal successors, (13), 3 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 21:08:03,407 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 23 transitions. [2023-11-06 21:08:03,408 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2023-11-06 21:08:03,408 INFO L187 NwaCegarLoop]: Found error trace [2023-11-06 21:08:03,408 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-06 21:08:03,408 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-11-06 21:08:03,409 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-06 21:08:03,409 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-11-06 21:08:03,409 INFO L85 PathProgramCache]: Analyzing trace with hash 2079009635, now seen corresponding path program 1 times [2023-11-06 21:08:03,410 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-06 21:08:03,410 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [865741557] [2023-11-06 21:08:03,410 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 21:08:03,411 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-06 21:08:03,430 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 21:08:03,518 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 21:08:03,518 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-06 21:08:03,518 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [865741557] [2023-11-06 21:08:03,519 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [865741557] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-06 21:08:03,519 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-06 21:08:03,519 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-11-06 21:08:03,520 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [222543591] [2023-11-06 21:08:03,520 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-06 21:08:03,523 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-11-06 21:08:03,524 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-06 21:08:03,525 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-11-06 21:08:03,525 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2023-11-06 21:08:03,526 INFO L87 Difference]: Start difference. First operand 15 states and 23 transitions. Second operand has 4 states, 4 states have (on average 3.5) internal successors, (14), 4 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 21:08:03,600 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-06 21:08:03,601 INFO L93 Difference]: Finished difference Result 33 states and 55 transitions. [2023-11-06 21:08:03,601 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-11-06 21:08:03,601 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 3.5) internal successors, (14), 4 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 14 [2023-11-06 21:08:03,602 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-06 21:08:03,602 INFO L225 Difference]: With dead ends: 33 [2023-11-06 21:08:03,603 INFO L226 Difference]: Without dead ends: 23 [2023-11-06 21:08:03,603 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 21:08:03,605 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 26 mSDsluCounter, 2 mSDsCounter, 0 mSdLazyCounter, 31 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 26 SdHoareTripleChecker+Valid, 5 SdHoareTripleChecker+Invalid, 45 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 31 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-06 21:08:03,606 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [26 Valid, 5 Invalid, 45 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 31 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-06 21:08:03,607 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2023-11-06 21:08:03,613 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2023-11-06 21:08:03,627 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 23 states, 22 states have (on average 1.4090909090909092) internal successors, (31), 22 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 21:08:03,628 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 31 transitions. [2023-11-06 21:08:03,629 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 31 transitions. Word has length 14 [2023-11-06 21:08:03,629 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-06 21:08:03,629 INFO L495 AbstractCegarLoop]: Abstraction has 23 states and 31 transitions. [2023-11-06 21:08:03,629 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 3.5) internal successors, (14), 4 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 21:08:03,630 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 31 transitions. [2023-11-06 21:08:03,631 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2023-11-06 21:08:03,631 INFO L187 NwaCegarLoop]: Found error trace [2023-11-06 21:08:03,631 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] [2023-11-06 21:08:03,631 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2023-11-06 21:08:03,632 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-06 21:08:03,632 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-11-06 21:08:03,633 INFO L85 PathProgramCache]: Analyzing trace with hash -1341023684, now seen corresponding path program 1 times [2023-11-06 21:08:03,633 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-06 21:08:03,633 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [190010370] [2023-11-06 21:08:03,634 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 21:08:03,634 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-06 21:08:03,679 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 21:08:03,826 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2023-11-06 21:08:03,827 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-06 21:08:03,827 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [190010370] [2023-11-06 21:08:03,827 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [190010370] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-06 21:08:03,828 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1357806039] [2023-11-06 21:08:03,828 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 21:08:03,828 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-06 21:08:03,829 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ec3dce6-5908-4ed7-8ba3-e32816b87ff4/bin/utaipan-verify-FOvIYxoinp/z3 [2023-11-06 21:08:03,832 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ec3dce6-5908-4ed7-8ba3-e32816b87ff4/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-06 21:08:03,836 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ec3dce6-5908-4ed7-8ba3-e32816b87ff4/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-11-06 21:08:03,942 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 21:08:03,945 INFO L262 TraceCheckSpWp]: Trace formula consists of 121 conjuncts, 4 conjunts are in the unsatisfiable core [2023-11-06 21:08:03,950 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-06 21:08:04,014 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2023-11-06 21:08:04,015 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-06 21:08:04,044 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2023-11-06 21:08:04,045 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1357806039] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-06 21:08:04,045 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [463104266] [2023-11-06 21:08:04,069 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2023-11-06 21:08:04,069 INFO L166 IcfgInterpreter]: Building call graph [2023-11-06 21:08:04,073 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-06 21:08:04,080 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-06 21:08:04,080 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-06 21:08:04,936 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-06 21:08:05,094 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '336#(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 21:08:05,095 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-06 21:08:05,095 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-06 21:08:05,101 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 7 [2023-11-06 21:08:05,104 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [819328617] [2023-11-06 21:08:05,104 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-06 21:08:05,106 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-11-06 21:08:05,107 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-06 21:08:05,108 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-11-06 21:08:05,109 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=99, Unknown=0, NotChecked=0, Total=132 [2023-11-06 21:08:05,110 INFO L87 Difference]: Start difference. First operand 23 states and 31 transitions. Second operand has 7 states, 7 states have (on average 3.857142857142857) internal successors, (27), 7 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 21:08:05,205 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-06 21:08:05,206 INFO L93 Difference]: Finished difference Result 43 states and 59 transitions. [2023-11-06 21:08:05,206 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-11-06 21:08:05,206 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 3.857142857142857) internal successors, (27), 7 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 22 [2023-11-06 21:08:05,207 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-06 21:08:05,208 INFO L225 Difference]: With dead ends: 43 [2023-11-06 21:08:05,209 INFO L226 Difference]: Without dead ends: 24 [2023-11-06 21:08:05,210 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 68 GetRequests, 57 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 21:08:05,213 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 0 mSDsluCounter, 6 mSDsCounter, 0 mSdLazyCounter, 76 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 9 SdHoareTripleChecker+Invalid, 76 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 76 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-06 21:08:05,215 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 9 Invalid, 76 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 76 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-06 21:08:05,218 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2023-11-06 21:08:05,226 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2023-11-06 21:08:05,227 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24 states, 23 states have (on average 1.391304347826087) internal successors, (32), 23 states have internal predecessors, (32), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 21:08:05,228 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 32 transitions. [2023-11-06 21:08:05,228 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 32 transitions. Word has length 22 [2023-11-06 21:08:05,229 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-06 21:08:05,229 INFO L495 AbstractCegarLoop]: Abstraction has 24 states and 32 transitions. [2023-11-06 21:08:05,229 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 3.857142857142857) internal successors, (27), 7 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 21:08:05,229 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 32 transitions. [2023-11-06 21:08:05,232 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2023-11-06 21:08:05,233 INFO L187 NwaCegarLoop]: Found error trace [2023-11-06 21:08:05,233 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] [2023-11-06 21:08:05,245 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ec3dce6-5908-4ed7-8ba3-e32816b87ff4/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2023-11-06 21:08:05,439 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ec3dce6-5908-4ed7-8ba3-e32816b87ff4/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2 [2023-11-06 21:08:05,439 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-06 21:08:05,440 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-11-06 21:08:05,440 INFO L85 PathProgramCache]: Analyzing trace with hash 1097032073, now seen corresponding path program 2 times [2023-11-06 21:08:05,441 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-06 21:08:05,441 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1494148559] [2023-11-06 21:08:05,441 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 21:08:05,441 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-06 21:08:05,477 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 21:08:05,643 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 21:08:05,643 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-06 21:08:05,644 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1494148559] [2023-11-06 21:08:05,644 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1494148559] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-06 21:08:05,644 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [54338181] [2023-11-06 21:08:05,645 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-11-06 21:08:05,645 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-06 21:08:05,645 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ec3dce6-5908-4ed7-8ba3-e32816b87ff4/bin/utaipan-verify-FOvIYxoinp/z3 [2023-11-06 21:08:05,651 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ec3dce6-5908-4ed7-8ba3-e32816b87ff4/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-06 21:08:05,674 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ec3dce6-5908-4ed7-8ba3-e32816b87ff4/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-11-06 21:08:05,737 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2023-11-06 21:08:05,737 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-06 21:08:05,739 INFO L262 TraceCheckSpWp]: Trace formula consists of 130 conjuncts, 4 conjunts are in the unsatisfiable core [2023-11-06 21:08:05,741 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-06 21:08:05,793 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 21:08:05,794 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-06 21:08:05,838 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 21:08:05,839 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [54338181] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-06 21:08:05,839 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1884362698] [2023-11-06 21:08:05,849 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2023-11-06 21:08:05,849 INFO L166 IcfgInterpreter]: Building call graph [2023-11-06 21:08:05,850 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-06 21:08:05,850 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-06 21:08:05,850 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-06 21:08:06,389 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-06 21:08:06,536 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '602#(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 21:08:06,537 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-06 21:08:06,537 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-06 21:08:06,537 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 8 [2023-11-06 21:08:06,537 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1611857527] [2023-11-06 21:08:06,537 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-06 21:08:06,538 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2023-11-06 21:08:06,539 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-06 21:08:06,542 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2023-11-06 21:08:06,543 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=40, Invalid=116, Unknown=0, NotChecked=0, Total=156 [2023-11-06 21:08:06,543 INFO L87 Difference]: Start difference. First operand 24 states and 32 transitions. Second operand has 8 states, 8 states have (on average 5.0) internal successors, (40), 8 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 21:08:06,642 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-06 21:08:06,643 INFO L93 Difference]: Finished difference Result 49 states and 71 transitions. [2023-11-06 21:08:06,643 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-11-06 21:08:06,643 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 5.0) internal successors, (40), 8 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 23 [2023-11-06 21:08:06,644 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-06 21:08:06,644 INFO L225 Difference]: With dead ends: 49 [2023-11-06 21:08:06,645 INFO L226 Difference]: Without dead ends: 32 [2023-11-06 21:08:06,646 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 72 GetRequests, 58 SyntacticMatches, 3 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 53 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=40, Invalid=116, Unknown=0, NotChecked=0, Total=156 [2023-11-06 21:08:06,650 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 7 mSDsluCounter, 2 mSDsCounter, 0 mSdLazyCounter, 40 mSolverCounterSat, 50 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 5 SdHoareTripleChecker+Invalid, 90 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 50 IncrementalHoareTripleChecker+Valid, 40 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-06 21:08:06,653 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [7 Valid, 5 Invalid, 90 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [50 Valid, 40 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-06 21:08:06,654 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2023-11-06 21:08:06,665 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32. [2023-11-06 21:08:06,665 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 32 states, 31 states have (on average 1.2903225806451613) internal successors, (40), 31 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 21:08:06,666 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 40 transitions. [2023-11-06 21:08:06,666 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 40 transitions. Word has length 23 [2023-11-06 21:08:06,666 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-06 21:08:06,666 INFO L495 AbstractCegarLoop]: Abstraction has 32 states and 40 transitions. [2023-11-06 21:08:06,667 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 5.0) internal successors, (40), 8 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 21:08:06,667 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 40 transitions. [2023-11-06 21:08:06,669 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2023-11-06 21:08:06,669 INFO L187 NwaCegarLoop]: Found error trace [2023-11-06 21:08:06,669 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-06 21:08:06,680 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ec3dce6-5908-4ed7-8ba3-e32816b87ff4/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2023-11-06 21:08:06,874 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ec3dce6-5908-4ed7-8ba3-e32816b87ff4/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable3 [2023-11-06 21:08:06,875 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-06 21:08:06,875 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-11-06 21:08:06,875 INFO L85 PathProgramCache]: Analyzing trace with hash -1956003888, now seen corresponding path program 3 times [2023-11-06 21:08:06,875 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-06 21:08:06,876 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1514107134] [2023-11-06 21:08:06,876 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 21:08:06,876 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-06 21:08:07,051 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 21:08:10,805 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 0 proven. 27 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-06 21:08:10,806 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-06 21:08:10,806 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1514107134] [2023-11-06 21:08:10,806 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1514107134] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-06 21:08:10,806 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [500665046] [2023-11-06 21:08:10,807 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-11-06 21:08:10,807 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-06 21:08:10,807 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ec3dce6-5908-4ed7-8ba3-e32816b87ff4/bin/utaipan-verify-FOvIYxoinp/z3 [2023-11-06 21:08:10,808 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ec3dce6-5908-4ed7-8ba3-e32816b87ff4/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-06 21:08:10,834 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ec3dce6-5908-4ed7-8ba3-e32816b87ff4/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-11-06 21:08:10,905 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-11-06 21:08:10,908 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-06 21:08:10,911 INFO L262 TraceCheckSpWp]: Trace formula consists of 170 conjuncts, 80 conjunts are in the unsatisfiable core [2023-11-06 21:08:10,917 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-06 21:08:10,967 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 21:08:11,221 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 0 proven. 27 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-06 21:08:11,222 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-06 21:08:12,519 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 0 proven. 24 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2023-11-06 21:08:12,521 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [500665046] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-06 21:08:12,521 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [152904628] [2023-11-06 21:08:12,524 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2023-11-06 21:08:12,524 INFO L166 IcfgInterpreter]: Building call graph [2023-11-06 21:08:12,525 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-06 21:08:12,525 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-06 21:08:12,525 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-06 21:08:12,933 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-06 21:08:13,345 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '981#(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 21:08:13,346 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-06 21:08:13,346 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-06 21:08:13,346 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24, 24] total 45 [2023-11-06 21:08:13,346 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1772834112] [2023-11-06 21:08:13,346 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-06 21:08:13,347 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 45 states [2023-11-06 21:08:13,347 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-06 21:08:13,348 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2023-11-06 21:08:13,349 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=151, Invalid=2299, Unknown=0, NotChecked=0, Total=2450 [2023-11-06 21:08:13,349 INFO L87 Difference]: Start difference. First operand 32 states and 40 transitions. Second operand has 45 states, 45 states have (on average 1.3111111111111111) internal successors, (59), 45 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 21:08:14,355 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-06 21:08:14,355 INFO L93 Difference]: Finished difference Result 57 states and 72 transitions. [2023-11-06 21:08:14,356 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2023-11-06 21:08:14,356 INFO L78 Accepts]: Start accepts. Automaton has has 45 states, 45 states have (on average 1.3111111111111111) internal successors, (59), 45 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) Word has length 31 [2023-11-06 21:08:14,357 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-06 21:08:14,357 INFO L225 Difference]: With dead ends: 57 [2023-11-06 21:08:14,357 INFO L226 Difference]: Without dead ends: 54 [2023-11-06 21:08:14,359 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 122 GetRequests, 73 SyntacticMatches, 0 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 566 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=157, Invalid=2393, Unknown=0, NotChecked=0, Total=2550 [2023-11-06 21:08:14,360 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 3 mSDsluCounter, 62 mSDsCounter, 0 mSdLazyCounter, 1169 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 65 SdHoareTripleChecker+Invalid, 1170 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 1169 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2023-11-06 21:08:14,360 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [3 Valid, 65 Invalid, 1170 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 1169 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2023-11-06 21:08:14,361 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2023-11-06 21:08:14,372 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 52. [2023-11-06 21:08:14,372 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 52 states, 51 states have (on average 1.3137254901960784) internal successors, (67), 51 states have internal predecessors, (67), 0 states have call successors, (0), 0 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 21:08:14,373 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 67 transitions. [2023-11-06 21:08:14,374 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 67 transitions. Word has length 31 [2023-11-06 21:08:14,374 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-06 21:08:14,374 INFO L495 AbstractCegarLoop]: Abstraction has 52 states and 67 transitions. [2023-11-06 21:08:14,375 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 45 states, 45 states have (on average 1.3111111111111111) internal successors, (59), 45 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 21:08:14,375 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 67 transitions. [2023-11-06 21:08:14,376 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2023-11-06 21:08:14,376 INFO L187 NwaCegarLoop]: Found error trace [2023-11-06 21:08:14,376 INFO L195 NwaCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-06 21:08:14,383 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ec3dce6-5908-4ed7-8ba3-e32816b87ff4/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Ended with exit code 0 [2023-11-06 21:08:14,583 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ec3dce6-5908-4ed7-8ba3-e32816b87ff4/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-06 21:08:14,583 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-06 21:08:14,584 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-11-06 21:08:14,584 INFO L85 PathProgramCache]: Analyzing trace with hash 1292936998, now seen corresponding path program 4 times [2023-11-06 21:08:14,584 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-06 21:08:14,584 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [710135377] [2023-11-06 21:08:14,584 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 21:08:14,584 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-06 21:08:14,612 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 21:08:14,740 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 4 proven. 5 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2023-11-06 21:08:14,740 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-06 21:08:14,740 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [710135377] [2023-11-06 21:08:14,741 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [710135377] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-06 21:08:14,741 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [426549140] [2023-11-06 21:08:14,741 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-11-06 21:08:14,741 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-06 21:08:14,741 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ec3dce6-5908-4ed7-8ba3-e32816b87ff4/bin/utaipan-verify-FOvIYxoinp/z3 [2023-11-06 21:08:14,742 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ec3dce6-5908-4ed7-8ba3-e32816b87ff4/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-06 21:08:14,750 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ec3dce6-5908-4ed7-8ba3-e32816b87ff4/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-11-06 21:08:14,831 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 21:08:14,832 INFO L262 TraceCheckSpWp]: Trace formula consists of 175 conjuncts, 8 conjunts are in the unsatisfiable core [2023-11-06 21:08:14,835 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-06 21:08:14,906 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2023-11-06 21:08:14,906 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-06 21:08:14,968 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2023-11-06 21:08:14,969 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [426549140] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-06 21:08:14,969 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1658371080] [2023-11-06 21:08:14,973 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2023-11-06 21:08:14,973 INFO L166 IcfgInterpreter]: Building call graph [2023-11-06 21:08:14,974 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-06 21:08:14,974 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-06 21:08:14,974 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-06 21:08:15,375 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-06 21:08:15,536 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1393#(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 21:08:15,536 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-06 21:08:15,536 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-06 21:08:15,536 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 14 [2023-11-06 21:08:15,536 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1279625407] [2023-11-06 21:08:15,536 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-06 21:08:15,537 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2023-11-06 21:08:15,537 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-06 21:08:15,537 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2023-11-06 21:08:15,538 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=72, Invalid=270, Unknown=0, NotChecked=0, Total=342 [2023-11-06 21:08:15,538 INFO L87 Difference]: Start difference. First operand 52 states and 67 transitions. Second operand has 14 states, 14 states have (on average 2.357142857142857) internal successors, (33), 14 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 21:08:15,726 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-06 21:08:15,727 INFO L93 Difference]: Finished difference Result 102 states and 132 transitions. [2023-11-06 21:08:15,727 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2023-11-06 21:08:15,727 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 2.357142857142857) internal successors, (33), 14 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 32 [2023-11-06 21:08:15,728 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-06 21:08:15,728 INFO L225 Difference]: With dead ends: 102 [2023-11-06 21:08:15,728 INFO L226 Difference]: Without dead ends: 53 [2023-11-06 21:08:15,729 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 103 GetRequests, 81 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 21:08:15,730 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 2 mSDsluCounter, 6 mSDsCounter, 0 mSdLazyCounter, 169 mSolverCounterSat, 64 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 9 SdHoareTripleChecker+Invalid, 233 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 64 IncrementalHoareTripleChecker+Valid, 169 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-06 21:08:15,730 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [2 Valid, 9 Invalid, 233 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [64 Valid, 169 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-11-06 21:08:15,731 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2023-11-06 21:08:15,742 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 53. [2023-11-06 21:08:15,742 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 53 states, 52 states have (on average 1.3076923076923077) internal successors, (68), 52 states have internal predecessors, (68), 0 states have call successors, (0), 0 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 21:08:15,743 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 68 transitions. [2023-11-06 21:08:15,743 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 68 transitions. Word has length 32 [2023-11-06 21:08:15,743 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-06 21:08:15,743 INFO L495 AbstractCegarLoop]: Abstraction has 53 states and 68 transitions. [2023-11-06 21:08:15,744 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 2.357142857142857) internal successors, (33), 14 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 21:08:15,744 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 68 transitions. [2023-11-06 21:08:15,745 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2023-11-06 21:08:15,745 INFO L187 NwaCegarLoop]: Found error trace [2023-11-06 21:08:15,745 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-06 21:08:15,756 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ec3dce6-5908-4ed7-8ba3-e32816b87ff4/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2023-11-06 21:08:15,951 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ec3dce6-5908-4ed7-8ba3-e32816b87ff4/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2023-11-06 21:08:15,952 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-06 21:08:15,952 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-11-06 21:08:15,952 INFO L85 PathProgramCache]: Analyzing trace with hash -1126206925, now seen corresponding path program 5 times [2023-11-06 21:08:15,952 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-06 21:08:15,953 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1163875991] [2023-11-06 21:08:15,953 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 21:08:15,953 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-06 21:08:15,975 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 21:08:16,100 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 1 proven. 8 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2023-11-06 21:08:16,100 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-06 21:08:16,100 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1163875991] [2023-11-06 21:08:16,100 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1163875991] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-06 21:08:16,100 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1786201595] [2023-11-06 21:08:16,101 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-11-06 21:08:16,101 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-06 21:08:16,101 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ec3dce6-5908-4ed7-8ba3-e32816b87ff4/bin/utaipan-verify-FOvIYxoinp/z3 [2023-11-06 21:08:16,102 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ec3dce6-5908-4ed7-8ba3-e32816b87ff4/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-06 21:08:16,127 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ec3dce6-5908-4ed7-8ba3-e32816b87ff4/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-11-06 21:08:16,194 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2023-11-06 21:08:16,194 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-06 21:08:16,196 INFO L262 TraceCheckSpWp]: Trace formula consists of 184 conjuncts, 8 conjunts are in the unsatisfiable core [2023-11-06 21:08:16,198 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-06 21:08:16,261 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 3 proven. 6 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2023-11-06 21:08:16,261 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-06 21:08:16,351 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 3 proven. 6 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2023-11-06 21:08:16,351 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1786201595] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-06 21:08:16,351 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1348406668] [2023-11-06 21:08:16,354 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2023-11-06 21:08:16,354 INFO L166 IcfgInterpreter]: Building call graph [2023-11-06 21:08:16,354 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-06 21:08:16,355 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-06 21:08:16,355 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-06 21:08:16,729 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-06 21:08:16,884 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1901#(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 21:08:16,884 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-06 21:08:16,885 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-06 21:08:16,885 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 14 [2023-11-06 21:08:16,885 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1962816812] [2023-11-06 21:08:16,885 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-06 21:08:16,885 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2023-11-06 21:08:16,886 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-06 21:08:16,886 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2023-11-06 21:08:16,886 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=66, Invalid=276, Unknown=0, NotChecked=0, Total=342 [2023-11-06 21:08:16,887 INFO L87 Difference]: Start difference. First operand 53 states and 68 transitions. Second operand has 14 states, 14 states have (on average 2.357142857142857) internal successors, (33), 14 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 21:08:17,046 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-06 21:08:17,046 INFO L93 Difference]: Finished difference Result 82 states and 110 transitions. [2023-11-06 21:08:17,047 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2023-11-06 21:08:17,047 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 2.357142857142857) internal successors, (33), 14 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 33 [2023-11-06 21:08:17,047 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-06 21:08:17,048 INFO L225 Difference]: With dead ends: 82 [2023-11-06 21:08:17,048 INFO L226 Difference]: Without dead ends: 41 [2023-11-06 21:08:17,048 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 107 GetRequests, 83 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 21:08:17,049 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 19 mSDsluCounter, 10 mSDsCounter, 0 mSdLazyCounter, 132 mSolverCounterSat, 63 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 19 SdHoareTripleChecker+Valid, 13 SdHoareTripleChecker+Invalid, 195 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 63 IncrementalHoareTripleChecker+Valid, 132 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-06 21:08:17,050 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [19 Valid, 13 Invalid, 195 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [63 Valid, 132 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-06 21:08:17,050 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2023-11-06 21:08:17,056 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 41. [2023-11-06 21:08:17,057 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 41 states, 40 states have (on average 1.225) internal successors, (49), 40 states have internal predecessors, (49), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 21:08:17,057 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 49 transitions. [2023-11-06 21:08:17,057 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 49 transitions. Word has length 33 [2023-11-06 21:08:17,057 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-06 21:08:17,057 INFO L495 AbstractCegarLoop]: Abstraction has 41 states and 49 transitions. [2023-11-06 21:08:17,058 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 2.357142857142857) internal successors, (33), 14 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 21:08:17,058 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 49 transitions. [2023-11-06 21:08:17,058 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2023-11-06 21:08:17,059 INFO L187 NwaCegarLoop]: Found error trace [2023-11-06 21:08:17,059 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-06 21:08:17,072 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ec3dce6-5908-4ed7-8ba3-e32816b87ff4/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2023-11-06 21:08:17,272 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ec3dce6-5908-4ed7-8ba3-e32816b87ff4/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-06 21:08:17,273 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-06 21:08:17,273 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-11-06 21:08:17,273 INFO L85 PathProgramCache]: Analyzing trace with hash -1772936516, now seen corresponding path program 6 times [2023-11-06 21:08:17,273 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-06 21:08:17,273 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [882045015] [2023-11-06 21:08:17,273 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 21:08:17,274 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-06 21:08:17,435 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 21:08:22,289 INFO L134 CoverageAnalysis]: Checked inductivity of 54 backedges. 0 proven. 54 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-06 21:08:22,289 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-06 21:08:22,289 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [882045015] [2023-11-06 21:08:22,289 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [882045015] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-06 21:08:22,289 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [997347790] [2023-11-06 21:08:22,290 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-11-06 21:08:22,290 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-06 21:08:22,290 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ec3dce6-5908-4ed7-8ba3-e32816b87ff4/bin/utaipan-verify-FOvIYxoinp/z3 [2023-11-06 21:08:22,291 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ec3dce6-5908-4ed7-8ba3-e32816b87ff4/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-06 21:08:22,315 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ec3dce6-5908-4ed7-8ba3-e32816b87ff4/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2023-11-06 21:08:22,404 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-11-06 21:08:22,404 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-06 21:08:22,408 WARN L260 TraceCheckSpWp]: Trace formula consists of 219 conjuncts, 114 conjunts are in the unsatisfiable core [2023-11-06 21:08:22,413 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-06 21:08:22,441 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 21:08:24,153 INFO L134 CoverageAnalysis]: Checked inductivity of 54 backedges. 0 proven. 54 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-06 21:08:24,153 INFO L327 TraceCheckSpWp]: Computing backward predicates...