./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/nla-digbench-scaling/dijkstra-u_unwindbound5.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 9bd2c7ff 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_8a8f60b2-02b4-4f49-bd13-09be77798e2d/bin/utaipan-verify-t7M7D8N6sZ/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8a8f60b2-02b4-4f49-bd13-09be77798e2d/bin/utaipan-verify-t7M7D8N6sZ/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8a8f60b2-02b4-4f49-bd13-09be77798e2d/bin/utaipan-verify-t7M7D8N6sZ/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8a8f60b2-02b4-4f49-bd13-09be77798e2d/bin/utaipan-verify-t7M7D8N6sZ/config/TaipanReach.xml -i ../../sv-benchmarks/c/nla-digbench-scaling/dijkstra-u_unwindbound5.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8a8f60b2-02b4-4f49-bd13-09be77798e2d/bin/utaipan-verify-t7M7D8N6sZ/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8a8f60b2-02b4-4f49-bd13-09be77798e2d/bin/utaipan-verify-t7M7D8N6sZ --witnessprinter.witness.filename witness --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 eb7e704db84b45f8c7f1cb386fc610e1107f57c6e67c0a3b2af510d7426cfd4f --- Real Ultimate output --- This is Ultimate 0.2.3-dev-9bd2c7f [2023-11-19 05:21:05,005 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-11-19 05:21:05,131 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8a8f60b2-02b4-4f49-bd13-09be77798e2d/bin/utaipan-verify-t7M7D8N6sZ/config/svcomp-Reach-32bit-Taipan_Default.epf [2023-11-19 05:21:05,136 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-11-19 05:21:05,137 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-11-19 05:21:05,179 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-11-19 05:21:05,180 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-11-19 05:21:05,180 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-11-19 05:21:05,181 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-11-19 05:21:05,185 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-11-19 05:21:05,185 INFO L153 SettingsManager]: * User list type=DISABLED [2023-11-19 05:21:05,186 INFO L151 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-11-19 05:21:05,187 INFO L153 SettingsManager]: * Explicit value domain=true [2023-11-19 05:21:05,191 INFO L153 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-11-19 05:21:05,192 INFO L153 SettingsManager]: * Octagon Domain=false [2023-11-19 05:21:05,192 INFO L153 SettingsManager]: * Abstract domain=CompoundDomain [2023-11-19 05:21:05,194 INFO L153 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-11-19 05:21:05,194 INFO L153 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-11-19 05:21:05,195 INFO L153 SettingsManager]: * Interval Domain=false [2023-11-19 05:21:05,195 INFO L151 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-11-19 05:21:05,196 INFO L153 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-11-19 05:21:05,196 INFO L153 SettingsManager]: * Simplification Technique=POLY_PAC [2023-11-19 05:21:05,197 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-11-19 05:21:05,198 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-11-19 05:21:05,198 INFO L153 SettingsManager]: * sizeof long=4 [2023-11-19 05:21:05,198 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-11-19 05:21:05,199 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-11-19 05:21:05,199 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-11-19 05:21:05,200 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-11-19 05:21:05,200 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-11-19 05:21:05,201 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-11-19 05:21:05,201 INFO L153 SettingsManager]: * sizeof long double=12 [2023-11-19 05:21:05,201 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2023-11-19 05:21:05,202 INFO L153 SettingsManager]: * Use constant arrays=true [2023-11-19 05:21:05,202 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-11-19 05:21:05,202 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-11-19 05:21:05,203 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-19 05:21:05,203 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-11-19 05:21:05,203 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-11-19 05:21:05,203 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopHeads [2023-11-19 05:21:05,204 INFO L153 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-11-19 05:21:05,204 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-11-19 05:21:05,204 INFO L153 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-11-19 05:21:05,205 INFO L153 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-11-19 05:21:05,205 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-11-19 05:21:05,205 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_8a8f60b2-02b4-4f49-bd13-09be77798e2d/bin/utaipan-verify-t7M7D8N6sZ/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8a8f60b2-02b4-4f49-bd13-09be77798e2d/bin/utaipan-verify-t7M7D8N6sZ Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> eb7e704db84b45f8c7f1cb386fc610e1107f57c6e67c0a3b2af510d7426cfd4f [2023-11-19 05:21:05,430 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-11-19 05:21:05,451 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-11-19 05:21:05,454 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-11-19 05:21:05,455 INFO L270 PluginConnector]: Initializing CDTParser... [2023-11-19 05:21:05,456 INFO L274 PluginConnector]: CDTParser initialized [2023-11-19 05:21:05,457 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8a8f60b2-02b4-4f49-bd13-09be77798e2d/bin/utaipan-verify-t7M7D8N6sZ/../../sv-benchmarks/c/nla-digbench-scaling/dijkstra-u_unwindbound5.c [2023-11-19 05:21:08,613 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-11-19 05:21:08,873 INFO L384 CDTParser]: Found 1 translation units. [2023-11-19 05:21:08,874 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8a8f60b2-02b4-4f49-bd13-09be77798e2d/sv-benchmarks/c/nla-digbench-scaling/dijkstra-u_unwindbound5.c [2023-11-19 05:21:08,891 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8a8f60b2-02b4-4f49-bd13-09be77798e2d/bin/utaipan-verify-t7M7D8N6sZ/data/887e91858/2ce1c043e3324e869bf553ec1a47fcb0/FLAG4a93d1451 [2023-11-19 05:21:08,910 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8a8f60b2-02b4-4f49-bd13-09be77798e2d/bin/utaipan-verify-t7M7D8N6sZ/data/887e91858/2ce1c043e3324e869bf553ec1a47fcb0 [2023-11-19 05:21:08,913 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-11-19 05:21:08,915 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-11-19 05:21:08,917 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-11-19 05:21:08,917 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-11-19 05:21:08,926 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-11-19 05:21:08,927 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.11 05:21:08" (1/1) ... [2023-11-19 05:21:08,929 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@f45a85e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:21:08, skipping insertion in model container [2023-11-19 05:21:08,929 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.11 05:21:08" (1/1) ... [2023-11-19 05:21:08,972 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-11-19 05:21:09,129 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_8a8f60b2-02b4-4f49-bd13-09be77798e2d/sv-benchmarks/c/nla-digbench-scaling/dijkstra-u_unwindbound5.c[525,538] [2023-11-19 05:21:09,163 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-19 05:21:09,174 INFO L202 MainTranslator]: Completed pre-run [2023-11-19 05:21:09,186 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_8a8f60b2-02b4-4f49-bd13-09be77798e2d/sv-benchmarks/c/nla-digbench-scaling/dijkstra-u_unwindbound5.c[525,538] [2023-11-19 05:21:09,202 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-19 05:21:09,217 INFO L206 MainTranslator]: Completed translation [2023-11-19 05:21:09,218 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:21:09 WrapperNode [2023-11-19 05:21:09,218 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-11-19 05:21:09,219 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-11-19 05:21:09,219 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-11-19 05:21:09,219 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-11-19 05:21:09,226 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:21:09" (1/1) ... [2023-11-19 05:21:09,234 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:21:09" (1/1) ... [2023-11-19 05:21:09,274 INFO L138 Inliner]: procedures = 14, calls = 17, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 64 [2023-11-19 05:21:09,274 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-11-19 05:21:09,275 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-11-19 05:21:09,275 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-11-19 05:21:09,275 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-11-19 05:21:09,284 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:21:09" (1/1) ... [2023-11-19 05:21:09,285 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:21:09" (1/1) ... [2023-11-19 05:21:09,287 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:21:09" (1/1) ... [2023-11-19 05:21:09,287 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:21:09" (1/1) ... [2023-11-19 05:21:09,291 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:21:09" (1/1) ... [2023-11-19 05:21:09,294 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:21:09" (1/1) ... [2023-11-19 05:21:09,296 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:21:09" (1/1) ... [2023-11-19 05:21:09,297 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:21:09" (1/1) ... [2023-11-19 05:21:09,306 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-11-19 05:21:09,307 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-11-19 05:21:09,307 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-11-19 05:21:09,307 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-11-19 05:21:09,308 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:21:09" (1/1) ... [2023-11-19 05:21:09,314 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-19 05:21:09,340 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8a8f60b2-02b4-4f49-bd13-09be77798e2d/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 05:21:09,356 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8a8f60b2-02b4-4f49-bd13-09be77798e2d/bin/utaipan-verify-t7M7D8N6sZ/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-11-19 05:21:09,380 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8a8f60b2-02b4-4f49-bd13-09be77798e2d/bin/utaipan-verify-t7M7D8N6sZ/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-11-19 05:21:09,403 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-11-19 05:21:09,404 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-11-19 05:21:09,404 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-11-19 05:21:09,404 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-11-19 05:21:09,405 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2023-11-19 05:21:09,405 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2023-11-19 05:21:09,503 INFO L236 CfgBuilder]: Building ICFG [2023-11-19 05:21:09,506 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2023-11-19 05:21:09,814 INFO L277 CfgBuilder]: Performing block encoding [2023-11-19 05:21:09,863 INFO L297 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-11-19 05:21:09,863 INFO L302 CfgBuilder]: Removed 2 assume(true) statements. [2023-11-19 05:21:09,868 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.11 05:21:09 BoogieIcfgContainer [2023-11-19 05:21:09,868 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-11-19 05:21:09,871 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-11-19 05:21:09,871 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-11-19 05:21:09,874 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-11-19 05:21:09,875 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 19.11 05:21:08" (1/3) ... [2023-11-19 05:21:09,875 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@41dc86ee and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.11 05:21:09, skipping insertion in model container [2023-11-19 05:21:09,876 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:21:09" (2/3) ... [2023-11-19 05:21:09,876 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@41dc86ee and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.11 05:21:09, skipping insertion in model container [2023-11-19 05:21:09,876 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.11 05:21:09" (3/3) ... [2023-11-19 05:21:09,878 INFO L112 eAbstractionObserver]: Analyzing ICFG dijkstra-u_unwindbound5.c [2023-11-19 05:21:09,899 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-11-19 05:21:09,899 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-11-19 05:21:09,948 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-11-19 05:21:09,956 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=LoopHeads, 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;@29ea443c, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-11-19 05:21:09,956 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-11-19 05:21:09,961 INFO L276 IsEmpty]: Start isEmpty. Operand has 24 states, 12 states have (on average 1.6666666666666667) internal successors, (20), 13 states have internal predecessors, (20), 9 states have call successors, (9), 1 states have call predecessors, (9), 1 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2023-11-19 05:21:09,968 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2023-11-19 05:21:09,968 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:21:09,969 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2023-11-19 05:21:09,970 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 05:21:09,975 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:21:09,975 INFO L85 PathProgramCache]: Analyzing trace with hash -678335095, now seen corresponding path program 1 times [2023-11-19 05:21:09,986 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:21:09,986 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1180541784] [2023-11-19 05:21:09,987 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:21:09,987 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:21:10,088 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:21:10,141 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:21:10,141 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1180541784] [2023-11-19 05:21:10,142 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unsupported non-linear arithmetic [2023-11-19 05:21:10,142 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1662733130] [2023-11-19 05:21:10,142 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:21:10,143 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:21:10,143 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8a8f60b2-02b4-4f49-bd13-09be77798e2d/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 05:21:10,146 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8a8f60b2-02b4-4f49-bd13-09be77798e2d/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 05:21:10,170 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8a8f60b2-02b4-4f49-bd13-09be77798e2d/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-11-19 05:21:10,213 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:21:10,215 INFO L262 TraceCheckSpWp]: Trace formula consists of 43 conjuncts, 1 conjunts are in the unsatisfiable core [2023-11-19 05:21:10,220 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 05:21:10,256 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-19 05:21:10,266 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-19 05:21:10,267 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1662733130] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-19 05:21:10,267 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-19 05:21:10,268 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-11-19 05:21:10,270 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [319872607] [2023-11-19 05:21:10,271 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-19 05:21:10,274 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2023-11-19 05:21:10,274 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 05:21:10,302 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2023-11-19 05:21:10,303 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2023-11-19 05:21:10,305 INFO L87 Difference]: Start difference. First operand has 24 states, 12 states have (on average 1.6666666666666667) internal successors, (20), 13 states have internal predecessors, (20), 9 states have call successors, (9), 1 states have call predecessors, (9), 1 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) Second operand has 2 states, 2 states have (on average 3.0) internal successors, (6), 2 states have internal predecessors, (6), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 05:21:10,338 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 05:21:10,339 INFO L93 Difference]: Finished difference Result 44 states and 78 transitions. [2023-11-19 05:21:10,340 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2023-11-19 05:21:10,341 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 2 states have (on average 3.0) internal successors, (6), 2 states have internal predecessors, (6), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 7 [2023-11-19 05:21:10,342 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 05:21:10,347 INFO L225 Difference]: With dead ends: 44 [2023-11-19 05:21:10,347 INFO L226 Difference]: Without dead ends: 22 [2023-11-19 05:21:10,351 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2023-11-19 05:21:10,355 INFO L413 NwaCegarLoop]: 32 mSDtfsCounter, 0 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 3 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 32 SdHoareTripleChecker+Invalid, 3 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 3 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-19 05:21:10,356 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 32 Invalid, 3 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 3 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-19 05:21:10,376 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2023-11-19 05:21:10,395 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2023-11-19 05:21:10,397 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22 states, 11 states have (on average 1.4545454545454546) internal successors, (16), 12 states have internal predecessors, (16), 9 states have call successors, (9), 1 states have call predecessors, (9), 1 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2023-11-19 05:21:10,398 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 33 transitions. [2023-11-19 05:21:10,400 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 33 transitions. Word has length 7 [2023-11-19 05:21:10,400 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 05:21:10,400 INFO L495 AbstractCegarLoop]: Abstraction has 22 states and 33 transitions. [2023-11-19 05:21:10,401 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 3.0) internal successors, (6), 2 states have internal predecessors, (6), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 05:21:10,401 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 33 transitions. [2023-11-19 05:21:10,402 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2023-11-19 05:21:10,402 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:21:10,402 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 05:21:10,418 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8a8f60b2-02b4-4f49-bd13-09be77798e2d/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Ended with exit code 0 [2023-11-19 05:21:10,608 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8a8f60b2-02b4-4f49-bd13-09be77798e2d/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable0 [2023-11-19 05:21:10,609 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 05:21:10,610 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:21:10,610 INFO L85 PathProgramCache]: Analyzing trace with hash 520368722, now seen corresponding path program 1 times [2023-11-19 05:21:10,610 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:21:10,610 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [779316103] [2023-11-19 05:21:10,611 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:21:10,611 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:21:10,637 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:21:10,667 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:21:10,667 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [779316103] [2023-11-19 05:21:10,667 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unsupported non-linear arithmetic [2023-11-19 05:21:10,668 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1781074722] [2023-11-19 05:21:10,668 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:21:10,668 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:21:10,669 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8a8f60b2-02b4-4f49-bd13-09be77798e2d/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 05:21:10,674 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8a8f60b2-02b4-4f49-bd13-09be77798e2d/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 05:21:10,676 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8a8f60b2-02b4-4f49-bd13-09be77798e2d/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-11-19 05:21:10,740 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:21:10,741 INFO L262 TraceCheckSpWp]: Trace formula consists of 51 conjuncts, 3 conjunts are in the unsatisfiable core [2023-11-19 05:21:10,743 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 05:21:10,794 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-19 05:21:10,794 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-19 05:21:10,795 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1781074722] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-19 05:21:10,795 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-19 05:21:10,795 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-11-19 05:21:10,795 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1281665781] [2023-11-19 05:21:10,796 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-19 05:21:10,796 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-11-19 05:21:10,797 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 05:21:10,797 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-11-19 05:21:10,798 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-11-19 05:21:10,798 INFO L87 Difference]: Start difference. First operand 22 states and 33 transitions. Second operand has 4 states, 4 states have (on average 2.0) internal successors, (8), 3 states have internal predecessors, (8), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 05:21:10,828 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 05:21:10,828 INFO L93 Difference]: Finished difference Result 42 states and 63 transitions. [2023-11-19 05:21:10,829 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-11-19 05:21:10,829 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.0) internal successors, (8), 3 states have internal predecessors, (8), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 9 [2023-11-19 05:21:10,829 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 05:21:10,830 INFO L225 Difference]: With dead ends: 42 [2023-11-19 05:21:10,831 INFO L226 Difference]: Without dead ends: 24 [2023-11-19 05:21:10,831 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-11-19 05:21:10,833 INFO L413 NwaCegarLoop]: 29 mSDtfsCounter, 0 mSDsluCounter, 56 mSDsCounter, 0 mSdLazyCounter, 13 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 85 SdHoareTripleChecker+Invalid, 13 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 13 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-19 05:21:10,834 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 85 Invalid, 13 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 13 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-19 05:21:10,835 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2023-11-19 05:21:10,841 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2023-11-19 05:21:10,842 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24 states, 13 states have (on average 1.3846153846153846) internal successors, (18), 14 states have internal predecessors, (18), 9 states have call successors, (9), 1 states have call predecessors, (9), 1 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2023-11-19 05:21:10,843 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 35 transitions. [2023-11-19 05:21:10,844 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 35 transitions. Word has length 9 [2023-11-19 05:21:10,844 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 05:21:10,844 INFO L495 AbstractCegarLoop]: Abstraction has 24 states and 35 transitions. [2023-11-19 05:21:10,844 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 2.0) internal successors, (8), 3 states have internal predecessors, (8), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 05:21:10,845 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 35 transitions. [2023-11-19 05:21:10,845 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2023-11-19 05:21:10,845 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:21:10,845 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 05:21:10,875 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8a8f60b2-02b4-4f49-bd13-09be77798e2d/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2023-11-19 05:21:11,066 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8a8f60b2-02b4-4f49-bd13-09be77798e2d/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:21:11,067 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 05:21:11,067 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:21:11,068 INFO L85 PathProgramCache]: Analyzing trace with hash -1389535714, now seen corresponding path program 1 times [2023-11-19 05:21:11,068 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:21:11,068 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [155302410] [2023-11-19 05:21:11,068 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:21:11,069 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:21:11,089 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-11-19 05:21:11,089 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [395072198] [2023-11-19 05:21:11,089 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:21:11,090 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:21:11,090 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8a8f60b2-02b4-4f49-bd13-09be77798e2d/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 05:21:11,099 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8a8f60b2-02b4-4f49-bd13-09be77798e2d/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 05:21:11,126 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8a8f60b2-02b4-4f49-bd13-09be77798e2d/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-11-19 05:21:11,177 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:21:11,178 INFO L262 TraceCheckSpWp]: Trace formula consists of 52 conjuncts, 5 conjunts are in the unsatisfiable core [2023-11-19 05:21:11,180 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 05:21:11,237 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-19 05:21:11,239 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-19 05:21:11,239 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:21:11,240 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [155302410] [2023-11-19 05:21:11,240 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-11-19 05:21:11,240 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [395072198] [2023-11-19 05:21:11,240 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [395072198] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-19 05:21:11,241 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-19 05:21:11,241 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-11-19 05:21:11,241 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1196479771] [2023-11-19 05:21:11,243 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-19 05:21:11,244 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-11-19 05:21:11,244 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 05:21:11,245 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-11-19 05:21:11,247 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2023-11-19 05:21:11,247 INFO L87 Difference]: Start difference. First operand 24 states and 35 transitions. Second operand has 5 states, 5 states have (on average 1.8) internal successors, (9), 4 states have internal predecessors, (9), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 05:21:11,303 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 05:21:11,304 INFO L93 Difference]: Finished difference Result 37 states and 51 transitions. [2023-11-19 05:21:11,305 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-11-19 05:21:11,306 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 1.8) internal successors, (9), 4 states have internal predecessors, (9), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 10 [2023-11-19 05:21:11,306 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 05:21:11,309 INFO L225 Difference]: With dead ends: 37 [2023-11-19 05:21:11,309 INFO L226 Difference]: Without dead ends: 28 [2023-11-19 05:21:11,310 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2023-11-19 05:21:11,314 INFO L413 NwaCegarLoop]: 28 mSDtfsCounter, 1 mSDsluCounter, 58 mSDsCounter, 0 mSdLazyCounter, 16 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 86 SdHoareTripleChecker+Invalid, 16 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 16 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-19 05:21:11,315 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1 Valid, 86 Invalid, 16 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 16 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-19 05:21:11,318 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2023-11-19 05:21:11,326 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 27. [2023-11-19 05:21:11,330 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27 states, 16 states have (on average 1.375) internal successors, (22), 17 states have internal predecessors, (22), 9 states have call successors, (9), 1 states have call predecessors, (9), 1 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2023-11-19 05:21:11,331 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 39 transitions. [2023-11-19 05:21:11,333 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 39 transitions. Word has length 10 [2023-11-19 05:21:11,334 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 05:21:11,334 INFO L495 AbstractCegarLoop]: Abstraction has 27 states and 39 transitions. [2023-11-19 05:21:11,336 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 1.8) internal successors, (9), 4 states have internal predecessors, (9), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 05:21:11,341 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 39 transitions. [2023-11-19 05:21:11,341 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2023-11-19 05:21:11,341 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:21:11,342 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 05:21:11,362 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8a8f60b2-02b4-4f49-bd13-09be77798e2d/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2023-11-19 05:21:11,561 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8a8f60b2-02b4-4f49-bd13-09be77798e2d/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:21:11,561 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 05:21:11,562 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:21:11,562 INFO L85 PathProgramCache]: Analyzing trace with hash -1388046164, now seen corresponding path program 1 times [2023-11-19 05:21:11,562 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:21:11,562 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1690884941] [2023-11-19 05:21:11,563 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:21:11,563 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:21:11,616 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:21:12,210 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-19 05:21:12,210 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:21:12,214 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1690884941] [2023-11-19 05:21:12,214 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1690884941] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-19 05:21:12,215 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-19 05:21:12,215 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2023-11-19 05:21:12,215 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1589192247] [2023-11-19 05:21:12,215 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-19 05:21:12,216 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2023-11-19 05:21:12,216 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 05:21:12,217 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2023-11-19 05:21:12,217 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-11-19 05:21:12,218 INFO L87 Difference]: Start difference. First operand 27 states and 39 transitions. Second operand has 6 states, 6 states have (on average 1.5) internal successors, (9), 4 states have internal predecessors, (9), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 05:21:14,400 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2023-11-19 05:21:16,594 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2023-11-19 05:21:16,792 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 05:21:16,792 INFO L93 Difference]: Finished difference Result 43 states and 63 transitions. [2023-11-19 05:21:16,794 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2023-11-19 05:21:16,794 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 1.5) internal successors, (9), 4 states have internal predecessors, (9), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 10 [2023-11-19 05:21:16,794 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 05:21:16,796 INFO L225 Difference]: With dead ends: 43 [2023-11-19 05:21:16,796 INFO L226 Difference]: Without dead ends: 41 [2023-11-19 05:21:16,797 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2023-11-19 05:21:16,797 INFO L413 NwaCegarLoop]: 30 mSDtfsCounter, 11 mSDsluCounter, 105 mSDsCounter, 0 mSdLazyCounter, 47 mSolverCounterSat, 17 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11 SdHoareTripleChecker+Valid, 135 SdHoareTripleChecker+Invalid, 66 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 17 IncrementalHoareTripleChecker+Valid, 47 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.5s IncrementalHoareTripleChecker+Time [2023-11-19 05:21:16,798 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [11 Valid, 135 Invalid, 66 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [17 Valid, 47 Invalid, 2 Unknown, 0 Unchecked, 4.5s Time] [2023-11-19 05:21:16,799 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2023-11-19 05:21:16,820 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 32. [2023-11-19 05:21:16,821 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 32 states, 19 states have (on average 1.3157894736842106) internal successors, (25), 21 states have internal predecessors, (25), 10 states have call successors, (10), 2 states have call predecessors, (10), 2 states have return successors, (9), 8 states have call predecessors, (9), 9 states have call successors, (9) [2023-11-19 05:21:16,826 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 44 transitions. [2023-11-19 05:21:16,826 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 44 transitions. Word has length 10 [2023-11-19 05:21:16,826 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 05:21:16,839 INFO L495 AbstractCegarLoop]: Abstraction has 32 states and 44 transitions. [2023-11-19 05:21:16,839 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 1.5) internal successors, (9), 4 states have internal predecessors, (9), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 05:21:16,839 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 44 transitions. [2023-11-19 05:21:16,840 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2023-11-19 05:21:16,840 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:21:16,841 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 05:21:16,841 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2023-11-19 05:21:16,841 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 05:21:16,842 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:21:16,842 INFO L85 PathProgramCache]: Analyzing trace with hash 1970023331, now seen corresponding path program 1 times [2023-11-19 05:21:16,842 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:21:16,842 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [842500111] [2023-11-19 05:21:16,842 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:21:16,843 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:21:16,868 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-11-19 05:21:16,868 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [615125018] [2023-11-19 05:21:16,868 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:21:16,868 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:21:16,869 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8a8f60b2-02b4-4f49-bd13-09be77798e2d/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 05:21:16,870 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8a8f60b2-02b4-4f49-bd13-09be77798e2d/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 05:21:16,876 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8a8f60b2-02b4-4f49-bd13-09be77798e2d/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-11-19 05:21:16,928 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:21:16,929 INFO L262 TraceCheckSpWp]: Trace formula consists of 59 conjuncts, 5 conjunts are in the unsatisfiable core [2023-11-19 05:21:16,931 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 05:21:16,971 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-19 05:21:16,972 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-19 05:21:17,011 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-19 05:21:17,012 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:21:17,012 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [842500111] [2023-11-19 05:21:17,012 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-11-19 05:21:17,013 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [615125018] [2023-11-19 05:21:17,013 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [615125018] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-19 05:21:17,013 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [7831315] [2023-11-19 05:21:17,033 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2023-11-19 05:21:17,033 INFO L166 IcfgInterpreter]: Building call graph [2023-11-19 05:21:17,037 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-19 05:21:17,042 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-19 05:21:17,043 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-19 05:21:17,470 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 9 for LOIs [2023-11-19 05:21:17,476 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-19 05:21:17,626 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSifa [7831315] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-19 05:21:17,627 INFO L185 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2023-11-19 05:21:17,628 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [4, 4] total 15 [2023-11-19 05:21:17,629 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [488166784] [2023-11-19 05:21:17,629 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-19 05:21:17,630 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2023-11-19 05:21:17,630 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 05:21:17,631 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2023-11-19 05:21:17,631 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=195, Unknown=0, NotChecked=0, Total=240 [2023-11-19 05:21:17,631 INFO L87 Difference]: Start difference. First operand 32 states and 44 transitions. Second operand has 10 states, 9 states have (on average 1.1111111111111112) internal successors, (10), 8 states have internal predecessors, (10), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 05:21:17,883 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 05:21:17,883 INFO L93 Difference]: Finished difference Result 71 states and 105 transitions. [2023-11-19 05:21:17,885 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2023-11-19 05:21:17,885 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 9 states have (on average 1.1111111111111112) internal successors, (10), 8 states have internal predecessors, (10), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 12 [2023-11-19 05:21:17,885 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 05:21:17,888 INFO L225 Difference]: With dead ends: 71 [2023-11-19 05:21:17,888 INFO L226 Difference]: Without dead ends: 52 [2023-11-19 05:21:17,889 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 56 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=45, Invalid=195, Unknown=0, NotChecked=0, Total=240 [2023-11-19 05:21:17,889 INFO L413 NwaCegarLoop]: 28 mSDtfsCounter, 7 mSDsluCounter, 60 mSDsCounter, 0 mSdLazyCounter, 173 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 17 SdHoareTripleChecker+Valid, 88 SdHoareTripleChecker+Invalid, 178 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 173 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-19 05:21:17,890 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [17 Valid, 88 Invalid, 178 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 173 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-11-19 05:21:17,890 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2023-11-19 05:21:17,905 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 40. [2023-11-19 05:21:17,907 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 40 states, 24 states have (on average 1.25) internal successors, (30), 27 states have internal predecessors, (30), 12 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (10), 9 states have call predecessors, (10), 10 states have call successors, (10) [2023-11-19 05:21:17,911 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 52 transitions. [2023-11-19 05:21:17,911 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 52 transitions. Word has length 12 [2023-11-19 05:21:17,912 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 05:21:17,912 INFO L495 AbstractCegarLoop]: Abstraction has 40 states and 52 transitions. [2023-11-19 05:21:17,912 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 9 states have (on average 1.1111111111111112) internal successors, (10), 8 states have internal predecessors, (10), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 05:21:17,913 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 52 transitions. [2023-11-19 05:21:17,914 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2023-11-19 05:21:17,914 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:21:17,914 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 05:21:17,942 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8a8f60b2-02b4-4f49-bd13-09be77798e2d/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2023-11-19 05:21:18,130 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8a8f60b2-02b4-4f49-bd13-09be77798e2d/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:21:18,130 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 05:21:18,131 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:21:18,131 INFO L85 PathProgramCache]: Analyzing trace with hash 600084205, now seen corresponding path program 1 times [2023-11-19 05:21:18,131 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:21:18,131 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [791177328] [2023-11-19 05:21:18,131 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:21:18,131 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:21:18,144 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-11-19 05:21:18,144 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [438565714] [2023-11-19 05:21:18,144 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:21:18,144 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:21:18,145 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8a8f60b2-02b4-4f49-bd13-09be77798e2d/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 05:21:18,155 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8a8f60b2-02b4-4f49-bd13-09be77798e2d/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 05:21:18,162 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8a8f60b2-02b4-4f49-bd13-09be77798e2d/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-11-19 05:21:18,203 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:21:18,204 INFO L262 TraceCheckSpWp]: Trace formula consists of 60 conjuncts, 7 conjunts are in the unsatisfiable core [2023-11-19 05:21:18,205 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 05:21:18,252 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-19 05:21:18,253 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-19 05:21:18,307 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-19 05:21:18,307 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:21:18,307 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [791177328] [2023-11-19 05:21:18,307 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-11-19 05:21:18,307 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [438565714] [2023-11-19 05:21:18,308 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [438565714] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-19 05:21:18,308 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [260208539] [2023-11-19 05:21:18,311 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2023-11-19 05:21:18,311 INFO L166 IcfgInterpreter]: Building call graph [2023-11-19 05:21:18,311 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-19 05:21:18,311 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-19 05:21:18,312 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-19 05:21:18,635 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 17 for LOIs [2023-11-19 05:21:18,654 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-19 05:21:18,930 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSifa [260208539] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-19 05:21:18,930 INFO L185 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2023-11-19 05:21:18,930 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [5, 5] total 16 [2023-11-19 05:21:18,930 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1335325712] [2023-11-19 05:21:18,931 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-19 05:21:18,931 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2023-11-19 05:21:18,931 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 05:21:18,932 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2023-11-19 05:21:18,932 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=223, Unknown=0, NotChecked=0, Total=272 [2023-11-19 05:21:18,932 INFO L87 Difference]: Start difference. First operand 40 states and 52 transitions. Second operand has 10 states, 9 states have (on average 1.1111111111111112) internal successors, (10), 8 states have internal predecessors, (10), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 05:21:19,550 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 05:21:19,551 INFO L93 Difference]: Finished difference Result 61 states and 84 transitions. [2023-11-19 05:21:19,551 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2023-11-19 05:21:19,551 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 9 states have (on average 1.1111111111111112) internal successors, (10), 8 states have internal predecessors, (10), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 13 [2023-11-19 05:21:19,552 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 05:21:19,553 INFO L225 Difference]: With dead ends: 61 [2023-11-19 05:21:19,553 INFO L226 Difference]: Without dead ends: 58 [2023-11-19 05:21:19,553 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 21 SyntacticMatches, 1 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 68 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=49, Invalid=223, Unknown=0, NotChecked=0, Total=272 [2023-11-19 05:21:19,554 INFO L413 NwaCegarLoop]: 33 mSDtfsCounter, 8 mSDsluCounter, 35 mSDsCounter, 0 mSdLazyCounter, 184 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 19 SdHoareTripleChecker+Valid, 68 SdHoareTripleChecker+Invalid, 195 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 184 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2023-11-19 05:21:19,555 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [19 Valid, 68 Invalid, 195 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 184 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2023-11-19 05:21:19,556 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2023-11-19 05:21:19,567 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 42. [2023-11-19 05:21:19,567 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 42 states, 26 states have (on average 1.2692307692307692) internal successors, (33), 29 states have internal predecessors, (33), 12 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (10), 9 states have call predecessors, (10), 10 states have call successors, (10) [2023-11-19 05:21:19,568 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 55 transitions. [2023-11-19 05:21:19,568 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 55 transitions. Word has length 13 [2023-11-19 05:21:19,569 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 05:21:19,569 INFO L495 AbstractCegarLoop]: Abstraction has 42 states and 55 transitions. [2023-11-19 05:21:19,569 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 9 states have (on average 1.1111111111111112) internal successors, (10), 8 states have internal predecessors, (10), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 05:21:19,569 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 55 transitions. [2023-11-19 05:21:19,570 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2023-11-19 05:21:19,570 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:21:19,570 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 05:21:19,597 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8a8f60b2-02b4-4f49-bd13-09be77798e2d/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2023-11-19 05:21:19,791 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8a8f60b2-02b4-4f49-bd13-09be77798e2d/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:21:19,792 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 05:21:19,792 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:21:19,792 INFO L85 PathProgramCache]: Analyzing trace with hash 601573755, now seen corresponding path program 1 times [2023-11-19 05:21:19,792 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:21:19,792 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [149344470] [2023-11-19 05:21:19,793 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:21:19,793 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:21:19,832 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:21:20,188 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2023-11-19 05:21:20,188 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:21:20,189 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [149344470] [2023-11-19 05:21:20,189 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [149344470] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-19 05:21:20,189 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-19 05:21:20,189 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2023-11-19 05:21:20,190 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [253021560] [2023-11-19 05:21:20,190 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-19 05:21:20,190 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2023-11-19 05:21:20,190 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 05:21:20,191 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2023-11-19 05:21:20,192 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-11-19 05:21:20,192 INFO L87 Difference]: Start difference. First operand 42 states and 55 transitions. Second operand has 6 states, 6 states have (on average 1.6666666666666667) internal successors, (10), 4 states have internal predecessors, (10), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 05:21:22,261 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2023-11-19 05:21:24,378 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2023-11-19 05:21:24,502 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 05:21:24,503 INFO L93 Difference]: Finished difference Result 60 states and 82 transitions. [2023-11-19 05:21:24,503 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2023-11-19 05:21:24,503 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 1.6666666666666667) internal successors, (10), 4 states have internal predecessors, (10), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 13 [2023-11-19 05:21:24,504 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 05:21:24,504 INFO L225 Difference]: With dead ends: 60 [2023-11-19 05:21:24,505 INFO L226 Difference]: Without dead ends: 58 [2023-11-19 05:21:24,505 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2023-11-19 05:21:24,506 INFO L413 NwaCegarLoop]: 29 mSDtfsCounter, 15 mSDsluCounter, 99 mSDsCounter, 0 mSdLazyCounter, 43 mSolverCounterSat, 16 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 16 SdHoareTripleChecker+Valid, 128 SdHoareTripleChecker+Invalid, 61 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 16 IncrementalHoareTripleChecker+Valid, 43 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.2s IncrementalHoareTripleChecker+Time [2023-11-19 05:21:24,506 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [16 Valid, 128 Invalid, 61 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [16 Valid, 43 Invalid, 2 Unknown, 0 Unchecked, 4.2s Time] [2023-11-19 05:21:24,507 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2023-11-19 05:21:24,519 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 42. [2023-11-19 05:21:24,519 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 42 states, 26 states have (on average 1.2692307692307692) internal successors, (33), 29 states have internal predecessors, (33), 12 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (10), 9 states have call predecessors, (10), 10 states have call successors, (10) [2023-11-19 05:21:24,520 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 55 transitions. [2023-11-19 05:21:24,520 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 55 transitions. Word has length 13 [2023-11-19 05:21:24,520 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 05:21:24,521 INFO L495 AbstractCegarLoop]: Abstraction has 42 states and 55 transitions. [2023-11-19 05:21:24,521 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 1.6666666666666667) internal successors, (10), 4 states have internal predecessors, (10), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 05:21:24,521 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 55 transitions. [2023-11-19 05:21:24,522 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2023-11-19 05:21:24,522 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:21:24,522 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 05:21:24,522 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2023-11-19 05:21:24,522 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 05:21:24,523 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:21:24,523 INFO L85 PathProgramCache]: Analyzing trace with hash 744933813, now seen corresponding path program 1 times [2023-11-19 05:21:24,523 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:21:24,523 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2028330998] [2023-11-19 05:21:24,523 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:21:24,524 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:21:24,530 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-11-19 05:21:24,530 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [655312558] [2023-11-19 05:21:24,531 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:21:24,531 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:21:24,531 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8a8f60b2-02b4-4f49-bd13-09be77798e2d/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 05:21:24,532 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8a8f60b2-02b4-4f49-bd13-09be77798e2d/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 05:21:24,550 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8a8f60b2-02b4-4f49-bd13-09be77798e2d/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2023-11-19 05:21:24,578 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:21:24,579 INFO L262 TraceCheckSpWp]: Trace formula consists of 61 conjuncts, 10 conjunts are in the unsatisfiable core [2023-11-19 05:21:24,581 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 05:21:24,703 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-19 05:21:24,703 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-19 05:21:24,703 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:21:24,704 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2028330998] [2023-11-19 05:21:24,704 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-11-19 05:21:24,704 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [655312558] [2023-11-19 05:21:24,704 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [655312558] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-19 05:21:24,704 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-19 05:21:24,705 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2023-11-19 05:21:24,705 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [819787073] [2023-11-19 05:21:24,705 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-19 05:21:24,706 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2023-11-19 05:21:24,706 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 05:21:24,707 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2023-11-19 05:21:24,707 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2023-11-19 05:21:24,707 INFO L87 Difference]: Start difference. First operand 42 states and 55 transitions. Second operand has 6 states, 6 states have (on average 2.0) internal successors, (12), 5 states have internal predecessors, (12), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-11-19 05:21:26,258 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.48s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2023-11-19 05:21:26,397 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 05:21:26,397 INFO L93 Difference]: Finished difference Result 78 states and 108 transitions. [2023-11-19 05:21:26,399 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-11-19 05:21:26,399 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 2.0) internal successors, (12), 5 states have internal predecessors, (12), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 15 [2023-11-19 05:21:26,400 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 05:21:26,401 INFO L225 Difference]: With dead ends: 78 [2023-11-19 05:21:26,401 INFO L226 Difference]: Without dead ends: 58 [2023-11-19 05:21:26,402 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2023-11-19 05:21:26,403 INFO L413 NwaCegarLoop]: 23 mSDtfsCounter, 7 mSDsluCounter, 65 mSDsCounter, 0 mSdLazyCounter, 56 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 88 SdHoareTripleChecker+Invalid, 70 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 56 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.7s IncrementalHoareTripleChecker+Time [2023-11-19 05:21:26,403 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [14 Valid, 88 Invalid, 70 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 56 Invalid, 0 Unknown, 0 Unchecked, 1.7s Time] [2023-11-19 05:21:26,404 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2023-11-19 05:21:26,436 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 58. [2023-11-19 05:21:26,436 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 58 states, 33 states have (on average 1.2121212121212122) internal successors, (40), 37 states have internal predecessors, (40), 19 states have call successors, (19), 5 states have call predecessors, (19), 5 states have return successors, (16), 15 states have call predecessors, (16), 16 states have call successors, (16) [2023-11-19 05:21:26,440 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 75 transitions. [2023-11-19 05:21:26,441 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 75 transitions. Word has length 15 [2023-11-19 05:21:26,441 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 05:21:26,441 INFO L495 AbstractCegarLoop]: Abstraction has 58 states and 75 transitions. [2023-11-19 05:21:26,442 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 2.0) internal successors, (12), 5 states have internal predecessors, (12), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-11-19 05:21:26,442 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 75 transitions. [2023-11-19 05:21:26,445 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2023-11-19 05:21:26,445 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:21:26,446 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 05:21:26,476 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8a8f60b2-02b4-4f49-bd13-09be77798e2d/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2023-11-19 05:21:26,662 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8a8f60b2-02b4-4f49-bd13-09be77798e2d/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:21:26,662 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 05:21:26,663 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:21:26,663 INFO L85 PathProgramCache]: Analyzing trace with hash -1700427874, now seen corresponding path program 1 times [2023-11-19 05:21:26,663 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:21:26,663 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1015061332] [2023-11-19 05:21:26,663 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:21:26,663 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:21:26,672 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-11-19 05:21:26,672 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1420217375] [2023-11-19 05:21:26,672 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:21:26,673 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:21:26,673 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8a8f60b2-02b4-4f49-bd13-09be77798e2d/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 05:21:26,674 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8a8f60b2-02b4-4f49-bd13-09be77798e2d/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 05:21:26,694 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8a8f60b2-02b4-4f49-bd13-09be77798e2d/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2023-11-19 05:21:26,732 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:21:26,733 INFO L262 TraceCheckSpWp]: Trace formula consists of 68 conjuncts, 5 conjunts are in the unsatisfiable core [2023-11-19 05:21:26,735 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 05:21:26,769 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-11-19 05:21:26,769 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-19 05:21:26,813 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-19 05:21:26,813 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:21:26,813 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1015061332] [2023-11-19 05:21:26,813 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-11-19 05:21:26,814 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1420217375] [2023-11-19 05:21:26,814 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1420217375] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-19 05:21:26,814 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1101121808] [2023-11-19 05:21:26,817 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2023-11-19 05:21:26,817 INFO L166 IcfgInterpreter]: Building call graph [2023-11-19 05:21:26,818 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-19 05:21:26,818 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-19 05:21:26,818 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-19 05:21:27,099 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 11 for LOIs [2023-11-19 05:21:27,111 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-19 05:21:27,386 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1564#(and (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (<= 7 ~counter~0))' at error location [2023-11-19 05:21:27,386 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-19 05:21:27,387 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-11-19 05:21:27,387 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 5] total 8 [2023-11-19 05:21:27,387 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [249532350] [2023-11-19 05:21:27,387 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-11-19 05:21:27,388 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2023-11-19 05:21:27,388 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 05:21:27,388 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2023-11-19 05:21:27,389 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=253, Unknown=0, NotChecked=0, Total=306 [2023-11-19 05:21:27,389 INFO L87 Difference]: Start difference. First operand 58 states and 75 transitions. Second operand has 8 states, 8 states have (on average 2.75) internal successors, (22), 8 states have internal predecessors, (22), 1 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2023-11-19 05:21:27,618 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 05:21:27,618 INFO L93 Difference]: Finished difference Result 116 states and 144 transitions. [2023-11-19 05:21:27,618 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2023-11-19 05:21:27,619 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 2.75) internal successors, (22), 8 states have internal predecessors, (22), 1 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 17 [2023-11-19 05:21:27,619 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 05:21:27,620 INFO L225 Difference]: With dead ends: 116 [2023-11-19 05:21:27,620 INFO L226 Difference]: Without dead ends: 102 [2023-11-19 05:21:27,621 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 33 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 98 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=73, Invalid=347, Unknown=0, NotChecked=0, Total=420 [2023-11-19 05:21:27,622 INFO L413 NwaCegarLoop]: 31 mSDtfsCounter, 59 mSDsluCounter, 90 mSDsCounter, 0 mSdLazyCounter, 75 mSolverCounterSat, 16 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 59 SdHoareTripleChecker+Valid, 121 SdHoareTripleChecker+Invalid, 91 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 16 IncrementalHoareTripleChecker+Valid, 75 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-19 05:21:27,623 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [59 Valid, 121 Invalid, 91 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [16 Valid, 75 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-11-19 05:21:27,623 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 102 states. [2023-11-19 05:21:27,650 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 102 to 96. [2023-11-19 05:21:27,650 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 96 states, 56 states have (on average 1.2321428571428572) internal successors, (69), 62 states have internal predecessors, (69), 30 states have call successors, (30), 9 states have call predecessors, (30), 9 states have return successors, (25), 24 states have call predecessors, (25), 25 states have call successors, (25) [2023-11-19 05:21:27,652 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 96 states to 96 states and 124 transitions. [2023-11-19 05:21:27,652 INFO L78 Accepts]: Start accepts. Automaton has 96 states and 124 transitions. Word has length 17 [2023-11-19 05:21:27,652 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 05:21:27,652 INFO L495 AbstractCegarLoop]: Abstraction has 96 states and 124 transitions. [2023-11-19 05:21:27,652 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 2.75) internal successors, (22), 8 states have internal predecessors, (22), 1 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2023-11-19 05:21:27,653 INFO L276 IsEmpty]: Start isEmpty. Operand 96 states and 124 transitions. [2023-11-19 05:21:27,653 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2023-11-19 05:21:27,654 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:21:27,654 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 05:21:27,683 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8a8f60b2-02b4-4f49-bd13-09be77798e2d/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2023-11-19 05:21:27,877 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8a8f60b2-02b4-4f49-bd13-09be77798e2d/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:21:27,877 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 05:21:27,878 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:21:27,878 INFO L85 PathProgramCache]: Analyzing trace with hash -1856396652, now seen corresponding path program 1 times [2023-11-19 05:21:27,878 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:21:27,878 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [253502083] [2023-11-19 05:21:27,878 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:21:27,878 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:21:27,889 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-11-19 05:21:27,889 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1610618216] [2023-11-19 05:21:27,889 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:21:27,889 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:21:27,890 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8a8f60b2-02b4-4f49-bd13-09be77798e2d/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 05:21:27,891 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8a8f60b2-02b4-4f49-bd13-09be77798e2d/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 05:21:27,910 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8a8f60b2-02b4-4f49-bd13-09be77798e2d/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2023-11-19 05:21:27,942 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:21:27,943 INFO L262 TraceCheckSpWp]: Trace formula consists of 69 conjuncts, 7 conjunts are in the unsatisfiable core [2023-11-19 05:21:27,944 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 05:21:27,985 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-11-19 05:21:27,985 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-19 05:21:28,046 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 2 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-19 05:21:28,046 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:21:28,047 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [253502083] [2023-11-19 05:21:28,047 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-11-19 05:21:28,047 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1610618216] [2023-11-19 05:21:28,047 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1610618216] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-19 05:21:28,047 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [766622772] [2023-11-19 05:21:28,050 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2023-11-19 05:21:28,050 INFO L166 IcfgInterpreter]: Building call graph [2023-11-19 05:21:28,051 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-19 05:21:28,051 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-19 05:21:28,051 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-19 05:21:28,336 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 43 for LOIs [2023-11-19 05:21:28,407 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-19 05:21:29,070 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2008#(and (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (exists ((|v_ULTIMATE.start_main_~r~0#1_BEFORE_CALL_11| Int) (|v_ULTIMATE.start_main_~n~0#1_BEFORE_CALL_11| Int) (|v_ULTIMATE.start_main_~q~0#1_BEFORE_CALL_6| Int)) (and (not (= (mod (+ (* |v_ULTIMATE.start_main_~n~0#1_BEFORE_CALL_11| 4294967295) |v_ULTIMATE.start_main_~r~0#1_BEFORE_CALL_11|) 4294967296) 0)) (<= (+ (mod |v_ULTIMATE.start_main_~n~0#1_BEFORE_CALL_11| 4294967296) 1) (mod |v_ULTIMATE.start_main_~q~0#1_BEFORE_CALL_6| 4294967296)))) (= ~counter~0 6))' at error location [2023-11-19 05:21:29,071 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-19 05:21:29,071 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-11-19 05:21:29,071 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 6] total 9 [2023-11-19 05:21:29,071 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1126627726] [2023-11-19 05:21:29,071 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-11-19 05:21:29,072 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2023-11-19 05:21:29,072 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 05:21:29,072 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2023-11-19 05:21:29,073 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=285, Unknown=0, NotChecked=0, Total=342 [2023-11-19 05:21:29,073 INFO L87 Difference]: Start difference. First operand 96 states and 124 transitions. Second operand has 9 states, 9 states have (on average 2.888888888888889) internal successors, (26), 9 states have internal predecessors, (26), 1 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2023-11-19 05:21:31,192 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2023-11-19 05:21:33,279 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2023-11-19 05:21:35,428 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2023-11-19 05:21:37,442 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2023-11-19 05:21:39,450 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2023-11-19 05:21:41,469 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2023-11-19 05:21:41,505 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 05:21:41,505 INFO L93 Difference]: Finished difference Result 150 states and 190 transitions. [2023-11-19 05:21:41,505 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2023-11-19 05:21:41,506 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 2.888888888888889) internal successors, (26), 9 states have internal predecessors, (26), 1 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 18 [2023-11-19 05:21:41,506 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 05:21:41,507 INFO L225 Difference]: With dead ends: 150 [2023-11-19 05:21:41,507 INFO L226 Difference]: Without dead ends: 125 [2023-11-19 05:21:41,508 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 34 SyntacticMatches, 1 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 111 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=77, Invalid=385, Unknown=0, NotChecked=0, Total=462 [2023-11-19 05:21:41,509 INFO L413 NwaCegarLoop]: 33 mSDtfsCounter, 79 mSDsluCounter, 98 mSDsCounter, 0 mSdLazyCounter, 77 mSolverCounterSat, 17 mSolverCounterUnsat, 6 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 12.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 79 SdHoareTripleChecker+Valid, 131 SdHoareTripleChecker+Invalid, 100 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 17 IncrementalHoareTripleChecker+Valid, 77 IncrementalHoareTripleChecker+Invalid, 6 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 12.4s IncrementalHoareTripleChecker+Time [2023-11-19 05:21:41,509 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [79 Valid, 131 Invalid, 100 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [17 Valid, 77 Invalid, 6 Unknown, 0 Unchecked, 12.4s Time] [2023-11-19 05:21:41,509 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 125 states. [2023-11-19 05:21:41,542 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 125 to 118. [2023-11-19 05:21:41,543 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 118 states, 69 states have (on average 1.2173913043478262) internal successors, (84), 76 states have internal predecessors, (84), 38 states have call successors, (38), 10 states have call predecessors, (38), 10 states have return successors, (33), 31 states have call predecessors, (33), 33 states have call successors, (33) [2023-11-19 05:21:41,545 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 118 states to 118 states and 155 transitions. [2023-11-19 05:21:41,545 INFO L78 Accepts]: Start accepts. Automaton has 118 states and 155 transitions. Word has length 18 [2023-11-19 05:21:41,546 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 05:21:41,546 INFO L495 AbstractCegarLoop]: Abstraction has 118 states and 155 transitions. [2023-11-19 05:21:41,546 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 2.888888888888889) internal successors, (26), 9 states have internal predecessors, (26), 1 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2023-11-19 05:21:41,546 INFO L276 IsEmpty]: Start isEmpty. Operand 118 states and 155 transitions. [2023-11-19 05:21:41,547 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2023-11-19 05:21:41,547 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:21:41,547 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 05:21:41,572 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8a8f60b2-02b4-4f49-bd13-09be77798e2d/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2023-11-19 05:21:41,762 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8a8f60b2-02b4-4f49-bd13-09be77798e2d/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2023-11-19 05:21:41,762 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 05:21:41,762 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:21:41,762 INFO L85 PathProgramCache]: Analyzing trace with hash -2046246330, now seen corresponding path program 1 times [2023-11-19 05:21:41,763 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:21:41,763 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1209439218] [2023-11-19 05:21:41,763 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:21:41,763 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:21:41,770 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-11-19 05:21:41,771 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [662956429] [2023-11-19 05:21:41,771 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:21:41,772 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:21:41,772 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8a8f60b2-02b4-4f49-bd13-09be77798e2d/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 05:21:41,773 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8a8f60b2-02b4-4f49-bd13-09be77798e2d/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 05:21:41,798 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8a8f60b2-02b4-4f49-bd13-09be77798e2d/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2023-11-19 05:21:41,906 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:21:41,907 INFO L262 TraceCheckSpWp]: Trace formula consists of 69 conjuncts, 11 conjunts are in the unsatisfiable core [2023-11-19 05:21:41,909 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 05:21:42,060 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 2 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-19 05:21:42,060 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-19 05:21:44,294 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 2 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-19 05:21:44,294 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:21:44,294 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1209439218] [2023-11-19 05:21:44,294 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-11-19 05:21:44,294 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [662956429] [2023-11-19 05:21:44,295 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [662956429] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-19 05:21:44,295 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [531993191] [2023-11-19 05:21:44,297 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2023-11-19 05:21:44,297 INFO L166 IcfgInterpreter]: Building call graph [2023-11-19 05:21:44,298 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-19 05:21:44,298 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-19 05:21:44,298 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-19 05:21:44,558 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 52 for LOIs [2023-11-19 05:21:44,666 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-19 05:21:56,056 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2538#(and (<= 2 ~counter~0) (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (<= ~counter~0 5) (or (exists ((|v_ULTIMATE.start_main_~r~0#1_BEFORE_CALL_19| Int) (|v_ULTIMATE.start_main_~n~0#1_BEFORE_CALL_19| Int) (|v_ULTIMATE.start_main_~q~0#1_BEFORE_CALL_14| Int)) (and (<= (mod |v_ULTIMATE.start_main_~q~0#1_BEFORE_CALL_14| 4294967296) (mod |v_ULTIMATE.start_main_~r~0#1_BEFORE_CALL_19| 4294967296)) (<= (+ (mod |v_ULTIMATE.start_main_~n~0#1_BEFORE_CALL_19| 4294967296) 1) (mod |v_ULTIMATE.start_main_~q~0#1_BEFORE_CALL_14| 4294967296)))) (exists ((|v_ULTIMATE.start_main_~r~0#1_BEFORE_CALL_18| Int) (|v_ULTIMATE.start_main_~n~0#1_BEFORE_CALL_18| Int) (|v_ULTIMATE.start_main_~q~0#1_BEFORE_CALL_13| Int)) (and (<= (+ (mod |v_ULTIMATE.start_main_~r~0#1_BEFORE_CALL_18| 4294967296) 1) (mod |v_ULTIMATE.start_main_~q~0#1_BEFORE_CALL_13| 4294967296)) (<= (+ (mod |v_ULTIMATE.start_main_~n~0#1_BEFORE_CALL_18| 4294967296) 1) (mod |v_ULTIMATE.start_main_~q~0#1_BEFORE_CALL_13| 4294967296)) (not (= (mod (* |v_ULTIMATE.start_main_~n~0#1_BEFORE_CALL_18| |v_ULTIMATE.start_main_~q~0#1_BEFORE_CALL_13|) 4294967296) (mod (* |v_ULTIMATE.start_main_~r~0#1_BEFORE_CALL_18| |v_ULTIMATE.start_main_~q~0#1_BEFORE_CALL_13|) 4294967296)))))))' at error location [2023-11-19 05:21:56,056 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-19 05:21:56,056 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-11-19 05:21:56,057 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 8 [2023-11-19 05:21:56,057 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1837181303] [2023-11-19 05:21:56,057 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-11-19 05:21:56,058 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2023-11-19 05:21:56,058 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 05:21:56,058 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2023-11-19 05:21:56,059 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=284, Unknown=0, NotChecked=0, Total=342 [2023-11-19 05:21:56,059 INFO L87 Difference]: Start difference. First operand 118 states and 155 transitions. Second operand has 8 states, 8 states have (on average 3.0) internal successors, (24), 7 states have internal predecessors, (24), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-11-19 05:22:02,824 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2023-11-19 05:22:04,859 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2023-11-19 05:22:06,913 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2023-11-19 05:22:10,426 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.12s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers []